KR20230073508A - Cylindarical battery module and cylindarical battery pack including the same - Google Patents

Abstract

The present invention includes a cylindrical battery module and a cylindrical battery pack including the same. The 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 for accommodating the cylindrical battery cell stack; a lower heat sink positioned in contact with the lower surface of the cylindrical battery cell stack; and a side heat sink positioned in contact with the side of the cylindrical battery cell, wherein the side heat sink is in the form of a parallel flow path and includes at least one flow path.

Description

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

The present invention relates to a cylindrical battery module and a cylindrical battery pack including the same, and more particularly, to a cylindrical battery module having improved cooling performance and a cylindrical 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.

As the performance of lithium ion batteries increases, stability issues such as heat propagation between cylindrical secondary batteries due to thermal runaway within the cylindrical secondary batteries are becoming more important. Suppression of heat propagation is required. In order to improve stability, a method of cooling the heat using a heat sink is common.

Conventionally, when heat is generated in a plurality of cylindrical secondary batteries, a bottom cooling method or a side cooling method is applied to cool them.

In the case of applying the bottom cooling method, cylindrical secondary batteries can be densely mounted, which is advantageous in terms of energy density and space utilization. In addition, since the planar area of the heat sink increases in battery modules and battery packs composed of a plurality of secondary batteries, there is a concern that the temperature deviation between cylindrical secondary batteries increases according to the flatness of the heat sink, and only on the bottom surface of the cylindrical secondary battery. Since cooling is performed, a large temperature deviation may occur in the lengthwise direction within the cylindrical secondary battery.

When the side cooling method is applied, it is advantageous in terms of cooling performance of the cylindrical secondary battery. However, since the heat sink must be located between the cylindrical secondary batteries, it is disadvantageous in terms of energy density and space utilization, and if the heat sink and the heat sink are not well bonded, the cooling performance may be rapidly reduced, similar to the bottom cooling method.

An object to be solved by the present invention is to provide a cylindrical battery module having improved cooling performance and a cylindrical 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; a lower heat sink positioned in contact with a lower surface of the cylindrical battery cell stack; and a side heat sink positioned while coming into contact with a side surface of the cylindrical battery cell, wherein the side heat sink has a parallel flow path type and includes at least one flow path.

The side heat sink may be positioned to be connected to the lower heat sink.

A part of the side heat sink may have a manifold structure connected to the lower heat sink.

In the manifold structure, both ends of the side heat sink may extend vertically from the lower heat sink.

The manifold structure may have a structure branching from both ends of the side heat sink to at least one flow path.

The heights of channels constituting the side heat sink may be non-uniform.

Heights of the flow channels may increase as the distance from the lower heat sink increases.

The side heat sink may be positioned between the cylindrical battery cell stacks.

The side heat sink may be located in contact with the side surface of the cylindrical battery cell along the longitudinal direction of the cylindrical battery cell stack.

The side heat sinks may be positioned at intervals of two rows with respect to the cylindrical battery cell stack.

A width of the side heat sink may be smaller than a diameter of the cylindrical battery cell.

A width of the side heat sink may be smaller than a radius of the cylindrical battery cell.

A width of the side heat sink may be 2 mm or less.

Cylindrical battery module according to another embodiment of the present invention is located between the upper frame and the lower frame, and further includes a side frame surrounding the side surface of the cylindrical battery cell stack.

The side frame may be positioned while contacting edges of the upper frame and the lower frame.

A flame retardant member may be positioned inside the side frame.

The flame retardant member may be located in an inner space of the side frame except for the cylindrical battery cell stack and the side heat sink.

The flame retardant member may be flame retardant silicon.

The side frame may have a shape in which regions corresponding to positions of both ends of the side heat sink are depressed.

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

According to embodiments, cooling performance of the cylindrical battery module and the cylindrical battery pack may be improved by constructing a hybrid cooling system through a lower heat sink and a side heat sink.

In addition, it is possible to improve safety by suppressing heat propagation between cylindrical battery cells with a side heat sink and a flame retardant member.

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 of a cylindrical battery module according to an embodiment of the present invention.
2 is an exploded perspective view of 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 top view of the cylindrical battery module according to an embodiment of the present invention viewed from the z-axis direction to the -z-axis direction.
6 is a cross-sectional view taken along line A-A' of FIG. 5;
7 is an exploded perspective view of a cylindrical battery module according to another embodiment of the present invention.
8 is a top view of the cylindrical battery module of FIG. 7 viewed from the z-axis direction to the -z-axis direction.
9 is a cross-sectional view taken along A-A' of FIG. 8;

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 of a cylindrical battery module according to an embodiment of the present invention. 2 is an exploded perspective view of 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 stack 120 in which a plurality of cylindrical battery cells 110 are stacked, a cylindrical battery cell stack ( 120) is accommodated, and includes an upper frame 300 and a lower frame 200, and the cylindrical battery cell stack 120 is positioned while in contact with the heat sink 500.

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 300 and a lower frame 200 . The upper frame 300 and the lower frame 200 may be coupled to each other in a state in which the cylindrical battery cell stack 120 is accommodated. The upper frame 300 and the lower frame 200 may physically protect the cylindrical battery cell stack 200 . To this end, the upper frame 300 and the lower frame 200 may include a metal material having a predetermined strength.

The upper frame 300 according to an embodiment of the present invention may be partially open while surrounding the top surface (z-axis direction) of the cylindrical battery cell stack 120 . Specifically, the upper frame 500 may have an open structure corresponding to the shape of each of the cylindrical battery cells 110 . In this case, the upper frame 300 may have a structure in which a plurality of circles with open centers are connected to each other. In this case, the circumference of a circle constituting a part of the upper frame 300 may correspond to the circumference of the cylindrical battery cell 110 .

The lower frame 200 according to an embodiment of the present invention may be partially open while surrounding the lower surface (-z-axis direction) of the cylindrical battery cell stack 120. Specifically, the lower frame 200 may have an open structure corresponding to the shape of each of the cylindrical battery cells 110 . In this case, the lower frame 200 may have a structure in which a plurality of circles with open centers are connected to each other. In this case, the circumference of a circle constituting a part of the lower frame 200 may correspond to the circumference of the cylindrical battery cell 110 .

The cylindrical battery cell stack 120 accommodated in the upper frame 300 and the lower frame 200 may be positioned while abutting the heat sink 500 . The heat sink 500 may cool heat generated from the cylindrical battery cell stack 120 .

Specifically, the cylindrical battery module 100 is mounted on a heat sink 500 located in a pack housing of a cylindrical battery pack. The heat sink 500 may be made of aluminum (Al) and may include a passage through which a refrigerant may move. However, it is not limited thereto, and any type including a material having cooling performance capable of sufficiently cooling heat generated from the cylindrical battery module 100 can be applied. The refrigerant may be a phase change fluid or may be a single phase fluid. For example, the refrigerant may be water or a mixture of water and ethylene glycol.

The heat sink 500 includes a lower heat sink 510 positioned in contact with the lower surface (-z-axis direction) of the cylindrical battery cell stack 120, and a longitudinal direction (x-axis direction) of the cylindrical battery cell stack 120. ), and a side heat sink 550 positioned in contact with the side surface of the cylindrical battery cell 110 along the line. That is, a hybrid cooling system may be configured by combining a bottom cooling method through the lower heat sink 510 and a side cooling method through the side heat sink 550 .

The lower heat sink 510 may have a size different from that of the lower surface of the cylindrical battery module 100, but may have a larger size than the lower surface of the cylindrical battery module 100. Accordingly, a plurality of cylindrical battery modules 100 may be positioned in one lower heat sink 510 . Alternatively, the lower heat sink 510 may have the same size as the lower surface of the cylindrical battery module 100 . To improve the energy density and differential pressure of the cylindrical battery module 100, the main heat sink 500 may be the lower heat sink 510.

The side heat sink 550 may be positioned on the lower heat sink 510 . The side heat sink 550 may be positioned between the cylindrical battery cell stack 120 while being positioned on the lower heat sink 510 . The side heat sink 550 may be positioned while making contact with the side surfaces of the cylindrical battery cells 110 constituting the cylindrical battery cell stack 120 . For example, the cylindrical battery cells 110 are arranged in the x-axis direction and stacked in the y-axis direction to form a cylindrical battery cell stack 120, and the side heat sink 550 is a cylindrical battery cell stack 120 It can be located in two line intervals for . However, the positioning of the side heat sinks 550 while having row spacing with respect to the cylindrical battery cell stack 120 is not limited to this drawing and can be changed.

The side heat sink 550 contributes to improving cooling performance of the lower heat sink 510 and functions to reduce a temperature deviation within the cylindrical battery cell stack 120 . The side heat sink 550 will be described in detail with reference to FIGS. 5 and 6 .

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 120 and the electrode assembly 120 are accommodated and the top is It includes an open cylindrical case 170, and a cap assembly 180 coupled to the open top of the cylindrical case 170.

First, the electrode assembly 120 according to the present embodiment may include a first electrode 130, a second electrode 140, and a separator 150. The jelly roll-type electrode assembly 120 may be formed by winding the first electrode 130 , the second electrode 140 , and the separator 150 together. The separator 150 may be interposed between the first electrode 130 and the second electrode 140 . In addition, it is preferable that a separator 160 is additionally disposed under the second electrode 140 to prevent the first electrode 130 and the second electrode 140 from coming into contact with each other when rolled in a jelly roll form.

The first electrode 130 includes a first electrode current collector 131 and a first active material layer 132 formed by coating an electrode active material on the first electrode current collector 131 . Specifically, the electrode active material is applied on the first electrode current collector 131 to form the first active material layer 132, and the electrode active material is not applied on the first electrode current collector 131, so the first electrode current collector ( The first electrode tab 133 may be bonded to the exposed portion of the electrode 131 by welding or the like.

The second electrode 140 includes a second electrode current collector 141 and a second active material layer 142 formed by coating an electrode active material on the second electrode current collector 141 . Specifically, the electrode active material is applied on the second electrode current collector 141 to form the second active material layer 142, and the electrode active material is not applied on the second electrode current collector 141 to form the second electrode current collector ( The second electrode tab 143 may be bonded to the exposed portion of the electrode 141 by welding or the like.

In this case, the first electrode 130 may be an anode, and the second electrode 140 may be a cathode. Accordingly, the first electrode tab 133 may be a positive electrode tab, and the second electrode tab 143 may be a negative electrode tab. Meanwhile, with respect to the rolled electrode assembly 120, the first electrode tab 133 and the second electrode tab 143 may protrude in opposite directions. As shown in FIG. 3 , the first electrode tab 133 may protrude in the direction where the cap assembly 180 is located, and the second electrode tab 143 may protrude toward the bottom of the cylindrical case 170. there is.

Meanwhile, the cylindrical case 170 is a structure for accommodating the electrode assembly 120 impregnated with electrolyte, and may include a metal material.

The cap assembly 180 according to this embodiment may include a top cap 181, a safety vent 182, and a current interruption member 183 (Current Interrupt Device, CID). The top cap 181 and the safety vent 182 may form a structure in close contact with each other. The safety vent 182 is positioned on the current blocking member 183 and may be electrically connected to the current blocking member 183 . Specifically, the center of the safety vent 182 and the center of the current blocking member 183 may be physically and electrically connected. A first electrode tab 133 protruding from the first electrode 130 may be connected to a lower end of the current blocking member 183 .

The safety vent 182 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 183 is located. The current blocking member 183 is a plate member through which current passes, and may have a plurality of through-holes for discharging gas.

The top cap 181, the safety vent 182, the current blocking member 183, and the first electrode tab 133 are sequentially connected to the electrode terminal through which the top cap 181 guides the electrical connection of the electrode assembly 120. can function as

The sealing gasket 185 may increase sealing force between the cap assembly 180 and the cylindrical case 170 . That is, the secondary battery 110 may be sealed by placing the gasket 185 between the cylindrical case 170 and the cap assembly 180 . By disposing the gasket 185, leakage of the internal electrolyte solution is prevented.

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

5 and 6, in the cylindrical battery module 100 according to an embodiment of the present invention, the cylindrical battery cell stack 120 is positioned on the lower heat sink 510, and the cylindrical battery cell stack ( 120, the side heat sink 550 is positioned between them. Illustration of the upper frame 300 and the lower frame 200 is omitted.

The side heat sink 550 may be positioned to be connected to the lower heat sink 510 . A part of the side heat sink 550 may have a manifold structure connected to the lower heat sink 510 . Here, the manifold structure may be a structure in which both ends of the side heat sink 550 extend vertically from the lower heat sink 510 and branch from both ends to at least one flow path. That is, the side heat sink 550 may have a parallel flow path shape.

The side heat sink 550 may include at least one or more distinct flow channels. In this case, the heights (in the z-axis direction) of the channels constituting the side heat sink 550 may be different from each other. The heights of channels constituting the side heat sink 550 may be non-uniform. The heights of the channels constituting the side heat sink 550 may increase as the distance from the lower heat sink 510 increases. That is, the height of the passage constituting the side heat sink 550 is formed wider toward the upper end of the cylindrical battery cell 110, so that a relatively larger amount of refrigerant can flow. Due to this, the cylindrical battery according to the difference in distance between the upper end of the cylindrical battery cell 110 positioned away from the lower heat sink 510 and the lower end of the cylindrical battery cell 110 positioned adjacent to the lower heat sink 510. Cooling efficiency may be improved by reducing a temperature deviation along the length (z-axis direction) of the cell 110 .

The width (y-axis direction) of the side heat sink 550 may be smaller than the width of a side heat sink generally applied to a conventional battery module. The width of the lateral heat sink 550 may be less than half of that of a conventional lateral heat sink. A width of the side heat sink 550 may be smaller than a diameter of the cylindrical battery cell 110 . A width of the side heat sink 550 may be smaller than a radius of the cylindrical battery cell 110 . Preferably, the width of the side heat sink 550 may be 2 mm or less. Accordingly, since the width of the side heat sink 550 is narrower than in the related art, the distance between the cylindrical battery cells 110 can be minimized, and thus the energy density of the cylindrical battery module 100 can be increased.

In addition, the cylindrical battery cell 110 in contact with the side heat sink 550 separates the cylindrical battery cell 110 physically adjacent to the side heat sink 550, and the refrigerant flowing inside the side heat sink 550 Due to the influence of, heat propagation between the cylindrical battery cells 110 can be suppressed. Thus, stability of the cylindrical battery module 100 can be improved.

7 is an exploded perspective view of a cylindrical battery module according to another embodiment of the present invention. 8 is a top view of the cylindrical battery module of FIG. 7 viewed from the z-axis direction to the -z-axis direction. 9 is a cross-sectional view taken along A-A′ of FIG. 8 .

The cylindrical batteries described in FIGS. 7 to 9 are modified examples of one embodiment of the present invention disclosed in FIGS. 1 to 6 , and detailed descriptions of the same components as those described above will be omitted.

7 to 9, the cylindrical battery module according to another embodiment of the present invention further includes a side frame 400. That is, the cylindrical battery module according to another embodiment of the present invention includes a cylindrical battery cell stack 120 in which a plurality of cylindrical battery cells 110 are stacked, and an upper frame 300 in which the cylindrical battery cell stack 120 is accommodated. ) and a lower frame 200, and a side frame 400 surrounding the side of the cylindrical battery cell stack 120, the cylindrical battery cell stack 120 is positioned while in contact with the heat sink 500. Illustration of the upper frame 300 and the lower frame 200 is omitted.

The side frame 400 may be positioned between the upper frame 300 and the lower frame 200 . The side frame 400 may be positioned while in contact with the edges of the upper frame 300 and the lower frame 200 . The upper edge (z-axis direction) of the side frame 400 may be coupled while contacting the edge of the upper frame 300, and the lower edge (-z-axis direction) of the side frame 400 is of the lower frame 200. It can be combined while contacting the edge. However, although not shown in the drawing, the side frame 400 may have a shape in which regions corresponding to positions of both ends of the side heat sink 550 are depressed.

The side frame 400 may be positioned while surrounding the side of the cylindrical battery cell stack 120 . A side heat sink 550 may be provided in the inner space of the side frame 400 in which the cylindrical battery cell stack 120 is accommodated, and a flame retardant member 600 made of resin such as resin may be positioned in the other space. can The flame retardant member 600 may be a flame retardant material. For example, the flame retardant member 600 may be flame retardant silicone.

The flame retardant member 600 may be injected and positioned inside the side frame 400 . The flame retardant member 600 may be injected into the side frame 400 and positioned in an inner space of the side frame 400 where the cylindrical battery cell stack 120 and the side heat sink 550 are not located. Accordingly, the flame retardant member 600 may be positioned in a region between the cylindrical battery cell 110 and the adjacent cylindrical battery cell 110 . Therefore, even if one cylindrical battery cell 110 is ignited, heat propagation to the adjacent cylindrical battery cell 110 can be prevented due to the flame retardant member 600 located between the adjacent cylindrical battery cells 110. , stability can be improved.

The cylindrical battery module described above and the cylindrical battery pack including the same can be applied to various devices. Such a device may be applied to means of transportation such as an electric bicycle, an electric vehicle, or a hybrid vehicle, but the present invention is not limited thereto and is applicable to various devices capable of using a battery module and a battery pack including the battery module, which is also applicable to the present invention. It belongs to the scope of the rights of the 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
300: upper frame
200: lower frame
500: heat sink
510: lower heat sink
550: side heat sink
600: flame retardant member

Claims (20)

A cylindrical battery cell stack in which a plurality of cylindrical battery cells are stacked;
a module frame accommodating the cylindrical battery cell stack;
a lower heat sink positioned in contact with a lower surface of the cylindrical battery cell stack; and
Including a side heat sink positioned in contact with the side surface of the cylindrical battery cell,
The side heat sink has a parallel flow path form and includes at least one or more cylindrical battery modules. In paragraph 1,
The side heat sink is a cylindrical battery module connected to the lower heat sink. In paragraph 2,
A portion of the side heat sink has a manifold structure connected to the lower heat sink. In paragraph 3,
The manifold structure is a cylindrical battery module in which both ends of the side heat sink extend vertically from the lower heat sink. In paragraph 3,
The manifold structure is a cylindrical battery module having a structure branching from both ends of the side heat sink to at least one flow path. In paragraph 1,
A cylindrical battery module having non-uniform heights of channels constituting the side heat sink. In paragraph 6,
A cylindrical battery module in which the heights of the passages increase as the distance from the lower heat sink increases. In paragraph 1,
The side heat sink is a cylindrical battery module located between the cylindrical battery cell stack. In paragraph 1,
The side heat sink is a cylindrical battery module located in contact with the side surface of the cylindrical battery cell along the longitudinal direction of the cylindrical battery cell stack. In paragraph 1,
The side heat sink is a cylindrical battery module located at intervals of two rows with respect to the cylindrical battery cell stack. In paragraph 1,
A cylindrical battery module in which the width of the side heat sink is smaller than the diameter of the cylindrical battery cell. In paragraph 1,
The width of the side heat sink is smaller than the radius of the cylindrical battery cell module. In paragraph 11,
A cylindrical battery module having a width of the side heat sink of 2 mm or less. In paragraph 1,
Cylindrical battery module further comprising a side frame positioned between the upper frame and the lower frame and surrounding a side surface of the cylindrical battery cell stack. In paragraph 14,
The side frame is a cylindrical battery module positioned while contacting the edges of the upper frame and the lower frame. In paragraph 14,
A cylindrical battery module in which a flame retardant member is located inside the side frame. In clause 16,
The flame retardant member is a cylindrical battery module located in the inner space of the side frame except for the cylindrical battery cell stack and the side heat sink. In clause 16,
The flame retardant member is a cylindrical battery module of flame retardant silicon. In paragraph 14,
The side frame is a cylindrical battery module having a shape in which an area corresponding to the position of both ends of the side heat sink is depressed. A cylindrical battery pack comprising the cylindrical battery module according to claim 1.

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