KR20230060154A - Cylindrical battery module and cylindrical battery pack including the same - Google Patents

Abstract

The present invention includes a cylindrical battery module and a cylindrical battery pack including the same, and a cylindrical battery module according to an embodiment of the present invention includes a cylindrical battery cell stack in which a plurality of cylindrical battery cells are stacked; a module frame accommodating the cylindrical battery cell stack; an upper cover covering an upper portion of the cylindrical battery cell stack; and a potting resin positioned inside the module frame, wherein the potting resin is placed in contact with a portion of the cylindrical battery cell.

Description

Cylindrical battery module and cylindrical battery pack including the same {CYLINDRICAL BATTERY MODULE AND CYLINDRICAL BATTERY PACK INCLUDING THE SAME}

The present invention relates to a cylindrical battery module and a battery pack including the same, and more particularly, to a cylindrical battery module that prevents flame propagation and has improved safety, and a battery pack including the same.

As technology development and demand for mobile devices increase, demand for secondary batteries as an energy source is rapidly increasing. Accordingly, a lot of research on secondary batteries that can meet various needs has been conducted.

Secondary batteries are attracting much attention as energy sources for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles as well as mobile devices such as mobile phones, digital cameras, and laptop computers.

Typically, there is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries having advantages such as high energy density, discharge voltage, and output stability.

In addition, secondary batteries are also classified according to the structure of the electrode assembly having a laminated structure of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. Typically, a jelly roll-type electrode assembly having a structure in which long sheet-type positive and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive and negative electrodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween. and stacked electrode assemblies. Recently, in order to solve the problems of the jelly roll-type electrode assembly and the stack-type electrode assembly, as a mixture of the jelly roll type and the stack type, unit cells in which positive electrodes and negative electrodes of a predetermined unit are stacked with a separator interposed therebetween are separated. A stack/folding type electrode assembly having a structure in which it is sequentially wound while being positioned on a film has been developed.

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

On the other hand, a secondary battery can be suitably used in the market only when it satisfies the performance suitable for the purpose of use and at the same time has safety. When designing a secondary battery, design factors are determined by simultaneously considering these performance and safety aspects. For batteries that have been designed and manufactured, safety evaluations such as overcharge, overdischarge, impact, nail test, hot box, etc. are conducted along with performance evaluations such as lifespan, efficiency characteristics, and high/low temperature characteristics. will proceed

Among various types of secondary batteries, in the case of cylindrical secondary batteries, gas is rapidly generated inside the secondary battery in an abnormal state such as overcharging, and when the internal pressure exceeds a certain level, the current between the electrode terminal and the electrode tab is blocked to prevent additional reactions from occurring. A current interrupt device (CID) may be included.

However, when ignition occurs due to an abnormal operation of any one of the plurality of cylindrical secondary batteries, there is a problem in that chain ignition may occur due to flame propagation to nearby cylindrical secondary batteries. Therefore, there is an attempt to reduce the occurrence of the above problems, and it is necessary to prevent flame propagation by changing the structure of the cylindrical battery frame.

An object to be solved by the present invention is to provide a cylindrical battery module with improved safety and a battery pack including the same.

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

A cylindrical battery module according to an embodiment of the present invention includes a cylindrical battery cell stack in which a plurality of cylindrical battery cells are stacked; a module frame accommodating the cylindrical battery cell stack; an upper cover covering an upper portion of the cylindrical battery cell stack; and a potting resin positioned inside the module frame, wherein the potting resin is placed in contact with a portion of the cylindrical battery cell.

The potting resin may be located in a region between the plurality of cylindrical battery cells accommodated in the module frame.

The potting resin may be located in a region between the cylindrical battery cell and an adjacent cylindrical battery cell, except for a region where the cylindrical battery cell and the module frame come into contact with each other.

The potting resin may be made of a flame retardant material.

The potting resin may be made of flame retardant silicon.

The upper cover may include an injection hole through which the potting resin is injected into the module frame.

The injection hole may be a hole passing through a region of the upper cover corresponding to a space between the plurality of cylindrical battery cells accommodated in the module frame.

The module frame includes an upper frame and a lower frame, and the upper frame and the lower frame surround side surfaces of the cylindrical battery cell stack, and upper and lower surfaces may be open.

The upper frame may include a first wall, and a height of the first wall may correspond to a height difference between the upper cover and an upper surface of the upper frame.

The upper frame may include a first support portion that is a pillar extending from the lower surface of the upper frame to an upper surface, and the lower frame may include a second support portion that is a pillar extending from the lower surface of the lower frame to the upper surface. there is.

The first support part and the second support part may be positioned to correspond to a space between the plurality of cylindrical battery cells.

The first support part and the second support part may contact each other and be positioned.

A support hole may be provided in a region of the upper cover corresponding to the first support portion.

The lower frame may include a concave portion, which is an area where a lower surface of the lower frame is partially depressed, and a gasket may be positioned in the concave portion.

The gasket may be an O-ring formed of a rubber material.

The gasket may be formed by double injection of plastic and rubber.

The upper frame may include a protruding portion protruding along an edge of a lower surface of the upper frame, and the lower frame may include a recessed portion recessed along an edge of an upper surface of the lower frame.

The protruding part may be inserted into the recessed part, and the protruding part and the recessed part may engage and engage each other.

A cylindrical battery pack according to another embodiment of the present invention includes the above-described cylindrical battery module.

According to embodiments, flame propagation to adjacent cylindrical battery cells can be prevented by applying a potting resin on top of the cylindrical battery module.

As a result, the safety of the cylindrical battery module and the battery pack including the same can be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a cylindrical battery module according to an embodiment of the present invention.
2 is an exploded perspective view showing a cylindrical battery module according to an embodiment of the present invention.
FIG. 3 is an exploded perspective view illustrating a cylindrical battery cell constituting the cylindrical battery module of FIG. 2 .
FIG. 4 is an exploded perspective view showing an electrode assembly included in the cylindrical battery cell of FIG. 3 before being wound.
5 is a cross-sectional view taken along line A-A' of FIG. 1;
6 is a top view of the cylindrical battery module of FIG. 1 viewed from the z-axis direction to the -z-axis direction.
FIG. 7 is a view showing that a potting resin is positioned in the lower frame of FIG. 1 .
8 is a top view of the lower frame of FIG. 1 viewed from the z-axis direction to the -z-axis direction.
FIG. 9 is a cross-sectional view illustrating an area A1 of FIG. 5 .
FIG. 10 is a perspective view illustrating an area A1 of FIG. 5 .
FIG. 11 is a cross-sectional view illustrating an area A2 of FIG. 5 .

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

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

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to the shown bar. In the drawings, the thickness is shown enlarged to clearly express the various layers and regions. And in the drawings, for convenience of explanation, 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 it is "directly on" the other part, but also the case where another part is in the middle. . Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between. In addition, to be "on" or "on" a reference part means to be located above or below the reference part, and to necessarily be located "above" or "on" in the opposite direction of gravity does not mean no.

In addition, throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

In addition, throughout the specification, when it is referred to as "planar image", it means when the target part is viewed from above, and when it is referred to as "cross-sectional image", it means when a cross section of the target part cut vertically is viewed from the side.

1 is a perspective view showing a cylindrical battery module according to an embodiment of the present invention. 2 is an exploded perspective view showing a cylindrical battery module according to an embodiment of the present invention.

1 and 2, the cylindrical battery module 100 according to an embodiment of the present invention includes a cylindrical battery cell 110, an upper frame 500 and a lower frame 600 in which the cylindrical battery cell 110 is accommodated. ) and an upper cover 530 provided with an injection hole 531 through which the potting resin 700 is injected between the cylindrical battery cell 110 .

The cylindrical battery cell 110 is formed in an elongated rod shape, and in this embodiment, the cylindrical battery cell 110 is exemplified. The cylindrical battery cell stack 120, which is a plurality of cylindrical battery cells 110, may be accommodated in a module frame.

A module frame accommodating the cylindrical battery cell stack 120 may include an upper frame 500 and a lower frame 600 . The upper frame 500 and the lower frame 600 are combined in a state in which the cylindrical battery cell stack 120 is accommodated, and the corner portions corresponding to each other are in contact, and the side of the cylindrical battery cell stack 200 is formed. A covering structure can be formed.

The upper frame 500 and the lower frame 600 each have an upper coupling portion and a lower coupling portion in corresponding regions, and the upper coupling portion and the lower coupling portion may be engaged with each other. Alternatively, the upper frame 500 and the lower frame 600 may be coupled by welding or the like in a state in which corresponding corner portions are in contact with each other. The upper frame 500 and the lower frame 600 may physically protect the cylindrical battery cell stack 200 . To this end, the upper frame 500 and the lower frame 600 may include a metal material having a predetermined strength.

The upper frame 500 according to an embodiment of the present invention may have a shape in which the side surfaces of the cylindrical battery cell stack 120 are wrapped around, and the upper surface (z-axis direction) and lower surface (-z-axis direction) are open. In this case, the upper frame 500 may have a shape corresponding to the side surface of the cylindrical battery cell stack 120 . While the upper surface of the upper frame 500 has a completely open structure, the lower surface of the upper frame 500 may have a partially open structure. Specifically, the lower surface of the upper frame 500 may have a structure surrounding each side of the cylindrical battery cell 110 . The lower surface of the upper frame 500 may have a structure in which a plurality of circles with a central hole are connected to each other. In this case, the circumference of the circle constituting the lower surface of the upper frame 500 may correspond to the circumference of the cylindrical battery cell 110 .

The upper frame 500 is assembled on one open surface and includes an upper cover 530 covering the top of the cylindrical battery cell stack 120 and a plurality of cylindrical battery cells 110 constituting the cylindrical battery cell stack 120. It includes a first support part 550 for fixing.

The upper cover 530 may be assembled and provided on one open surface of the upper frame 500 . The upper cover 530 may be formed in a plate-like structure covering an upper portion of the cylindrical battery cell stack 120 mounted on the upper frame 500 . That is, the upper frame 500 may surround the side surface of the cylindrical battery cell stack 120, and the upper cover 530 may cover the remaining top surface (z-axis direction). The upper cover 530 may have a shape corresponding to that of the upper frame 500 .

The upper cover 530 may include an injection hole 531 . The injection hole 531 may be a hole penetrating a region of the upper cover 530 corresponding to a space between the plurality of cylindrical battery cells 110 constituting the cylindrical battery cell stack 120 . The potting resin 700 may be injected between the plurality of cylindrical battery cells 110 constituting the cylindrical battery cell stack 120 through the injection hole 531 .

The upper cover 530 may be located lower than the height of one end of the upper frame 500 . Accordingly, a difference in height between the upper cover 530 and one end of the upper frame 500 may occur.

The upper frame 500 may include a first wall 540 . The first wall 540 may be formed due to a height difference between the upper surface of the upper cover 530 and the upper frame 500 . The height of the first wall 540 may correspond to a height difference between the upper surface of the upper cover 530 and the upper frame 500 . Due to the first wall 540, even if a large amount of the potting resin 700 is injected through the injection hole 531 and the potting resin 700 overflows to the outside of the upper cover 530, the first wall 540 It does not flow beyond the outer wall of the upper frame 500. The potting resin 700 injected through the injection hole 531 of the upper cover 530 will be described in detail in FIG. 5 to be described later.

A first support for fixing the positions of the plurality of cylindrical battery cells 110 accommodated in the upper frame 500 may be provided on the lower surface of the upper frame 500 .

The first support part 550 may be a pillar extending from the lower surface (in the -z-axis direction) of the upper frame 500 to the upper surface (in the z-axis direction). The first support part 550 may be located in contact with a part of the lower surface of the upper frame 500 .

The first support part 550 is positioned to correspond to the space between the cylindrical battery cells 110 formed when the plurality of cylindrical battery cells 110 are positioned in the module frame, but the injection hole 531 of the upper cover 530 is located in a non-corresponding region.

One area of the upper cover 530 corresponding to the first support part 550 may include a support hole 532 . The end of the first support part 550 is positioned while passing through the support hole 532 to improve the fixing power of the battery cell 110 accommodated in the upper frame 500 and to improve the rigidity of the cylindrical battery module 100. can

The lower frame 600 according to an embodiment of the present invention may have a shape that surrounds the side surfaces of the cylindrical battery cell stack 120 and has an open upper surface (z direction) and lower surface (−z direction). The lower frame 600 may have a shape corresponding to the side surface of the cylindrical battery cell stack 120 . While the upper surface of the lower frame 600 has a completely open structure, the lower surface of the lower frame 600 has a partially open structure, and may have a structure that partially surrounds the lower surface of the cylindrical battery cell stack 120. Specifically, the lower surface of the lower frame 600 may have a structure surrounding each edge of the cylindrical battery cell 110 . The lower surface of the lower frame 600 may have a structure in which a plurality of circles with a center open are connected to each other. In this case, the circumference of the circle constituting the lower surface of the lower frame 600 may be smaller than the circumference of the cylindrical battery cell 110 .

A lower surface of the lower frame 600 may include a second support 650 for fixing positions of the plurality of cylindrical battery cells 110 accommodated in the lower frame 600 .

The second support part 650 may be a pillar extending from the lower surface (−z-axis direction) of the lower frame 600 to the upper surface (z-axis direction). The second support part 650 may be located in contact with a part of the lower surface of the lower frame 600 .

The second support part 650 may be positioned to correspond to the space between the cylindrical battery cells 110 formed when the plurality of cylindrical battery cells 110 are positioned. The second support part 650 may be positioned while corresponding to the first support part 550 in a state in which the upper frame 500 and the lower frame 600 are coupled, and the first support part 550 and the second support part 650 can be positioned while touching.

On the other hand, although not specifically shown, the module frame according to the modified example may be a mono frame having an integrated side surface. That is, it may not be a structure in which the upper frame 500 and the lower frame 600 are coupled to each other, but a structure in which side surfaces are integrated by extrusion molding.

FIG. 3 is an exploded perspective view illustrating a cylindrical battery cell constituting the cylindrical battery module of FIG. 2 . FIG. 4 is an exploded perspective view showing an electrode assembly included in the cylindrical battery cell of FIG. 3 before being wound.

Referring to FIGS. 3 and 4, the cylindrical battery cell 110 according to an embodiment of the present invention, referring to FIGS. 3 and 4, the electrode assembly 200 and the electrode assembly 200 are accommodated and the top is It includes an open cylindrical case 300 and a cap assembly 400 coupled to the open top of the cylindrical case 300 .

First, the electrode assembly 200 according to the present embodiment may include a first electrode 210, a second electrode 220, and a separator 230. The jelly roll-type electrode assembly 200 may be formed by winding the first electrode 210 , the second electrode 220 , and the separator 230 together. The separator 230 may be interposed between the first electrode 210 and the second electrode 220 . In addition, it is preferable that a separator 240 is additionally disposed under the second electrode 220 to prevent the first electrode 210 and the second electrode 220 from contacting each other when rolled in a jelly roll form.

The first electrode 210 includes a first electrode current collector 211 and a first active material layer 212 formed by coating an electrode active material on the first electrode current collector 211 . Specifically, the electrode active material is applied on the first electrode current collector 211 to form the first active material layer 212, and the electrode active material is not applied on the first electrode current collector 211, so the first electrode current collector ( The first electrode tab 213 may be joined to a portion where 211 is exposed by welding or the like.

The second electrode 220 includes a second electrode current collector 221 and a second active material layer 222 formed by coating an electrode active material on the second electrode current collector 221 . Specifically, the electrode active material is applied on the second electrode current collector 221 to form the second active material layer 222, and the electrode active material is not applied on the second electrode current collector 221, so the second electrode current collector ( The second electrode tab 223 may be joined to a portion where 221 is exposed by welding or the like.

In this case, the first electrode 210 may be an anode, and the second electrode 220 may be a cathode. Accordingly, the first electrode tab 213 may be a positive electrode tab, and the second electrode tab 223 may be a negative electrode tab. Meanwhile, with respect to the rolled electrode assembly 200, the first electrode tab 213 and the second electrode tab 223 may protrude in opposite directions. As shown in FIG. 3 , the first electrode tab 213 may protrude in the direction where the cap assembly 400 is located, and the second electrode tab 223 may protrude toward the bottom of the cylindrical case 300. there is.

Meanwhile, the cylindrical case 300 is a structure for accommodating the electrode assembly 200 impregnated with electrolyte, and may include a metal material.

The cap assembly 400 according to this embodiment may include a top cap 410, a safety vent 420, and a current interruption member 430 (Current Interrupt Device, CID). The top cap 410 and the safety vent 420 may form a structure in close contact with each other. The safety vent 420 is positioned on the current blocking member 430 and may be electrically connected to the current blocking member 430 . Specifically, the center of the safety vent 420 and the center of the current blocking member 430 may be physically and electrically connected. A first electrode tab 213 protruding from the first electrode 210 may be connected to a lower end of the current blocking member 430 .

The safety vent 420 is a thin film structure through which current passes, and its center may protrude downward, that is, in a direction where the current blocking member 430 is located. The current blocking member 430 is a plate member through which current passes, and may have a plurality of through-holes for discharging gas.

The top cap 410, the safety vent 420, the current blocking member 430, and the first electrode tab 213 are sequentially connected to the electrode terminal through which the top cap 410 guides the electrical connection of the electrode assembly 200. can function as

The sealing gasket 450 may increase sealing force between the cap assembly 400 and the cylindrical case 300 . That is, the secondary battery 100 may be sealed by placing the gasket 700 between the cylindrical case 300 and the cap assembly 400 . By disposing the gasket 450, leakage of the internal electrolyte solution is prevented.

5 is a cross-sectional view taken along A-A′ of FIG. 1; 6 is a top view of the cylindrical battery module of FIG. 1 viewed from the z-axis direction to the -z-axis direction.

5 and 6, in the cylindrical battery module 100 according to an embodiment of the present invention, the cylindrical battery cells 110 are accommodated in a module frame in which an upper frame 500 and a lower frame 600 are combined. And, the potting resin 700 may be positioned in the space between the cylindrical battery cells 110 .

The potting resin 700 may be injected through the injection hole 531 of the upper cover 530 positioned on the upper surface of the upper frame 500 . In the potting resin 700, the cylindrical battery cell stack 120 is accommodated in a module frame in which the upper frame 500 and the lower frame 600 are combined, and the upper cover ( 530 is positioned, it may be injected into the space between the cylindrical battery cells 110 through the injection hole 531 located in one region of the upper cover 530 .

The potting resin 700 may be formed of a flame retardant material or a phase change material. For example, the potting resin 700 may be made of flame retardant silicon.

The potting resin 700 may be located inside the module frame. The potting resin 700 injected through the injection hole 531 may contact a portion of the cylindrical battery cell 110 and be positioned between the cylindrical battery cells 110 . The potting resin 700 is a cylindrical battery cell adjacent to the cylindrical battery cell 110, except for a region where the cylindrical battery cell 110 and the upper frame 500 or the cylindrical battery cell 110 and the lower frame 600 contact each other ( 110) may be located in the region between. Therefore, even if one cylindrical battery cell 110 is ignited, the potting resin 700 located between the adjacent cylindrical battery cells 110 can prevent the flame from propagating to the adjacent cylindrical battery cells 110. . In addition, since the potting resin 700 is injected only between the cylindrical battery cells 110 instead of the entire inside of the module frame, the weight of the cylindrical battery module 100 can be reduced.

In addition to being positioned between the cylindrical battery cells 110, the potting resin 700 may be positioned while covering the upper cover 530. As described above in the description of FIGS. 1 and 2, since the upper cover 530 is located lower than the upper surface of the upper frame 500, in this case, the amount of potting resin 700 that can accommodate the module frame is greater Even if the potting resin 700 is injected, the potting resin 700 may not overflow to the outside of the upper frame 500 .

FIG. 7 is a view showing that a potting resin is positioned in the lower frame of FIG. 1 .

Referring to FIG. 7 , in the cylindrical battery module 100 according to an embodiment of the present invention, cylindrical battery cells 110 are accommodated in a module frame in which an upper frame 500 and a lower frame 600 are combined, and The potting resin 700 may be positioned in the space between the battery cells 110 . Specifically, the potting resin 700 may be located in contact with a part of the second support 650 and the cylindrical battery cell 110 located in the space between the cylindrical battery cells 110 accommodated in the lower frame 600. can Due to this, the position of the cylindrical battery cell 110 is fixed more firmly, and stability of the cylindrical battery module 100 can be improved.

Although not disclosed in the drawings, the potting resin 700 may be positioned in the same shape on the upper frame 500 as well.

8 is a top view of the lower frame of FIG. 1 viewed from the z-axis direction to the -z-axis direction. FIG. 9 is a cross-sectional view illustrating an area A1 of FIG. 5 . FIG. 10 is a perspective view illustrating an area A1 of FIG. 5 .

Referring to FIGS. 8 to 10 , the lower frame 600 according to an embodiment of the present invention may include a concave portion 660 corresponding to the shape of each cylindrical battery cell 110 .

The concave portion 660 may refer to an area where the lower surface of the lower frame 600 is partially depressed. The concave portion 660 may be a circularly depressed area corresponding to the shape of each cylindrical battery cell 110 accommodated in the lower frame 600 .

Each cylindrical battery cell 110 may be mounted to correspond to the concave portion 660 . The concave portion 660 may correspond to the number of each cylindrical battery cell 110 accommodated in the lower frame 600 . Each cylindrical battery cell 110 may include a convex portion 111 on a lower surface, and the convex portion 111 may have a shape corresponding to the concave portion 660 . In this case, the convex portion 111 may be inserted into the concave portion 660 and mounted, thereby fixing the position of the cylindrical battery cell 110 more firmly, thereby improving the stability of the cylindrical battery module 100. can

A gasket 661 is positioned in the concave portion 660 to improve waterproof performance and prevent the potting resin 700 from leaking out of the lower frame 600 . The gasket 661 is an O-ring made of rubber and may be fitted into the concave portion 660 . Alternatively, the gasket 661 may be formed by double injection of plastic and rubber.

FIG. 11 is a cross-sectional view illustrating an area A2 of FIG. 5 .

Referring to FIG. 11, the upper frame 500 and the lower frame 600 according to the present embodiment include a protrusion 570 and a depression 670, respectively, and the protrusion 570 and the depression 670 are hooked. can be combined

The upper frame 500 according to the present embodiment may include a protrusion 570 protruding in the -z-axis direction. The protruding portion 570 may refer to a protruding area along the edge of the upper frame 500 . The protruding portion 570 may be a protruding area along the edge of the lower surface of the upper frame 500 . The protruding portion 570 may protrude and be located at one end of the upper frame 500 .

The lower frame 600 according to the present embodiment may include a recessed portion 670 recessed in the -z-axis direction. The recessed portion 670 may refer to a recessed area along the edge of the lower frame 600 . The recessed portion 670 may be a recessed area along the edge of the upper surface of the lower frame 600 . The recessed portion 670 may be recessed and located at one end of the lower frame 600 .

A width of the protrusion 570 may be smaller than a width of the depression 670 , and the protrusion 570 may be inserted into the depression 670 . The protruding portion 570 and the recessed portion 670 may be engaged while being engaged with each other. However, the protruding portion 570 and the recessed portion 670 are not limited to engaging, and may be coupled by various methods such as welding.

The cylindrical battery module described above and the cylindrical battery pack including the same can be applied to various devices. These devices can be applied to means of transportation such as electric bicycles, electric vehicles, hybrid vehicles, etc., but the present invention is not limited thereto and can be applied to various devices that can use a cylindrical battery module and a battery pack including the same, which is also It belongs to the scope of the present invention.

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 made according to the present invention. falls within the scope of the rights of

100: cylindrical battery module
110: cylindrical battery cell
120: cylindrical battery cell stack
500: upper frame
530: upper cover
600: lower frame
700: potting resin

Claims (19)

A cylindrical battery cell stack in which a plurality of cylindrical battery cells are stacked;
a module frame accommodating the cylindrical battery cell stack;
an upper cover covering an upper portion of the cylindrical battery cell stack; and
Including a potting resin located inside the module frame,
The potting resin is a cylindrical battery module positioned while in contact with a portion of the cylindrical battery cell. In paragraph 1,
The potting resin is located in a region between the plurality of cylindrical battery cells accommodated in the module frame. In paragraph 1,
The potting resin is located in a region between the cylindrical battery cell and an adjacent cylindrical battery cell, except for a region where the cylindrical battery cell and the module frame come into contact. In paragraph 1,
The potting resin is a cylindrical battery module composed of a flame retardant material. In paragraph 4,
The potting resin is a cylindrical battery module composed of flame retardant silicon. In paragraph 1,
The upper cover includes an injection hole through which the potting resin is injected into the module frame. In paragraph 6,
The injection hole is a hole passing through a region of the upper cover corresponding to the space between the plurality of cylindrical battery cells accommodated in the module frame. In paragraph 1,
The module frame includes an upper frame and a lower frame,
The upper frame and the lower frame surround the side surfaces of the cylindrical battery cell stack, and the upper and lower surfaces are open cylindrical battery modules. In paragraph 8,
the upper frame includes a first wall;
A cylindrical battery module in which the height of the first wall corresponds to the height difference between the top surface of the upper cover and the upper frame. In paragraph 8,
The upper frame includes a first support portion that is a pillar extending from a lower surface of the upper frame to an upper surface,
The lower frame is a cylindrical battery module including a second support part that is a pillar extending from the lower surface to the upper surface of the lower frame. In paragraph 10,
The first support part and the second support part are positioned to correspond to the space between the plurality of cylindrical battery cells. In paragraph 10,
The first support part and the second support part are located in contact with each other, and a cylindrical battery module. In paragraph 10,
A cylindrical battery module having a support hole in one region of the upper cover corresponding to the first support portion. In paragraph 8,
The lower frame includes a concave portion, which is a region in which a lower surface of the lower frame is partially depressed,
A cylindrical battery module in which a gasket is positioned in the concave portion. In paragraph 14,
The gasket is a cylindrical battery module that is an O-ring formed of a rubber material. In paragraph 14,
The gasket is a cylindrical battery module formed by double injection of plastic and rubber. In paragraph 8,
The upper frame includes a protrusion protruding along an edge of the lower surface of the upper frame,
The lower frame includes a recessed portion recessed along an upper surface edge of the lower frame. In paragraph 17,
The protruding part is inserted into the recessed part, and the protruding part and the recessed part are engaged with each other while being engaged with each other. A cylindrical battery pack comprising the cylindrical battery module according to claim 1.

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