Cylindrical battery, battery unit structure including the same, and automobile

Abstract

The present invention discloses a cylindrical battery configured to be able to reduce deformation of an electrode assembly and the intensity of a flame when a thermal event occurs inside a battery cell. A cylindrical battery according to one aspect of the present invention includes a first electrode, a second electrode, and a separator interposed therebetween, and an electrode assembly having a central hole formed by winding a laminate including the first electrode, the second electrode, and the separator around a winding axis; a battery housing that houses the electrode assembly through an opening formed on one side; and an anti-inflammatory member at least partially intervening inside the central hole.

Description

Technical Field

[0001] The present invention relates to a cylindrical battery, a battery pack including the same, and an automobile. More specifically, the present invention relates to a cylindrical battery configured to reduce deformation of an electrode assembly and the intensity of a flame when a thermal event occurs inside, a battery pack including the same, and an automobile.

[0002] This application claims priority based on Korean Patent Application No. 10-2023-0068708 filed on May 26, 2023, and all of the contents disclosed in the specification and drawings of the application are incorporated into this application.

Background Art

[0003] Secondary batteries, which are highly applicable to a variety of products and have electrical characteristics such as a high energy density, are widely applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by an electric drive source.

[0004] Such secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency improvement because they not only have a primary merit of significantly reducing the use of fossil fuels but also have a merit of generating no by-products associated with energy use.

[0005] Currently widely used types of rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of a single rechargeable battery cell of this type is approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, multiple batteries are connected in series to form a battery pack. Alternatively, depending on the required charge and discharge capacity of the battery pack, multiple batteries may be connected in parallel to form a battery pack. Consequently, the number of batteries included in a battery pack and the configuration of their electrical connections can be set in various ways depending on the required output voltage and / or charge and discharge capacity.

[0006] However, when multiple battery modules are densely packed into a small space like this, they can be vulnerable to accidents such as fires and explosions. For example, if a thermal event causes a flame to occur inside one battery cell, there is a problem that the flame could spread to the outside, potentially causing a chain reaction of thermal events in adjacent battery cells. [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above problems, and its purpose is to suppress deformation of the electrode assembly when a thermal event occurs inside the battery cell.

[0008] In another embodiment, another object of the present invention is to reduce the intensity of flames and gases when thermal events occur.

[0009] However, the technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned should be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0010] A cylindrical battery according to one aspect of the present invention for achieving the above-mentioned objectives includes: an electrode assembly comprising a first electrode, a second electrode, and a separator interposed therebetween, having a central hole formed by winding a laminate comprising the first electrode, the second electrode, and the separator around a winding shaft; a battery housing that accommodates the electrode assembly through an opening formed on one side; and a flame suppressor member having at least a portion interposed inside the central hole.

[0011] The flame suppressing member may include a first portion interposed inside the central hole and a second portion located outside the central hole.

[0012] The flame suppressing member may have a shape in which the first portion corresponds to the central hole.

[0013] At least a portion of the second part of the flame suppressing member may be located on the electrode assembly.

[0014] The cylindrical battery may include an insulating member between the flame suppressor and the electrode assembly.

[0015] The cylindrical battery may include a first current collector which comprises an electrode assembly coupling portion that connects to the electrode assembly and a housing coupling portion that connects to the battery housing.

[0016] The first current collector may be provided with a current collector hole in a portion corresponding to the central hole.

[0017] At least a portion of the first part of the flame suppressing member may be located within the current collector hole.

[0018] The cylindrical battery may include an insulating member between the flame suppressor and the first current collector.

[0019] The flame suppressing member may include a porous metal.

[0020] The cylindrical battery may include a top cap configured to cover the opening portion.

[0021] The fire extinguishing member may have a height such that the second portion corresponds to the distance between the electrode assembly and the top cap.

[0022] The cylindrical battery may include an insulating member between the fire extinguishing member and the top cap.

[0023] The battery unit structure according to an embodiment of the present invention may include the cylindrical battery according to an embodiment of the present invention.

[0024] The automobile according to an embodiment of the present invention may include the battery unit structure according to an embodiment of the present invention.

Advantages of the Invention

[0025] According to one aspect of the present invention, when a thermal event occurs inside the battery, deformation of the electrode assembly due to the drag force generated along the outer peripheral surface of the central hole can be suppressed. This is because the fire extinguishing member is inserted into and fixed to the central hole, suppressing deformation due to the drag force.

[0026] Also, the fire extinguishing member may include a porous metal. The fire extinguishing member may include a plurality of metal meshes. In such a case, the fire extinguishing member can reduce the intensity of the flame and gas. When the fire extinguishing member including the porous metal comes into contact with the flame and gas, the fire extinguishing member can absorb heat. At the same time, the gas can escape through the porous fire extinguishing member. Therefore, the fire extinguishing member can lower the temperature of the flame and gas by allowing the gas to escape.

[0027] According to another aspect of the present invention, when the anti-inflammatory member is fitted exactly into the central hole, or when the diameter or size of the central hole becomes smaller due to the swelling phenomenon during the use of the battery, the anti-inflammatory member is naturally better fixed in the central hole, thereby more effectively suppressing the deformation of the electrode assembly. Further, by combining the anti-inflammatory member with the electrode assembly and / or the first current collector, the effect of reducing the intensity of the flame and gas can be maximized.

[0028] According to still another aspect of the present invention, when the diameter or size of the central hole becomes smaller than necessary due to the swelling phenomenon, even if the separator is broken, it is possible to suppress a short circuit between the electrode assembly and the anti-inflammatory member.

[0029] According to still another aspect of the present invention, it is possible to suppress unnecessary electrical connection between the anti-inflammatory member and the first current collector and a short circuit caused thereby.

Brief Description of the Drawings

[0030] [Figure 1] It is a diagram showing the appearance of a cylindrical battery according to an embodiment of the present invention. [Figure 2] It is a diagram showing a state before winding of an electrode assembly included in a cylindrical battery according to an embodiment of the present invention. [Figure 3] It is a diagram showing a part of a cross section of a cylindrical battery according to an embodiment of the present invention. [Figure 4] It is a diagram showing deformation of an electrode assembly when a thermal event occurs inside a conventional cylindrical battery. [Figure 5] It is a 3D diagram showing deformation of an electrode assembly when a thermal event occurs inside a conventional cylindrical battery. [Figure 6] It is a diagram showing the internal pressure over time when a thermal event occurs inside a conventional cylindrical battery. [Figure 7] It is an enlarged view of a part of FIG. 6 showing the flow of pressure. [Figure 8]This figure shows a flame suppression member included in a cylindrical battery according to an embodiment of the present invention. [Figure 9] This is a partial cross-sectional view of a flame suppressor included in a cylindrical battery according to an embodiment of the present invention, showing a flame suppressor with an insulating treatment applied to its surface. [Figure 10] This figure shows a first current collector included in a cylindrical battery according to an embodiment of the present invention. [Figure 11] This is a partial cross-sectional view of a flame suppressor included in a cylindrical battery according to an embodiment of the present invention, and shows a flame suppressor that has been insulated at a different position from the flame suppressor shown in Figure 9. [Figure 12] This is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention. [Figure 13] This is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention, and shows a cylindrical battery having a different structure compared to Figure 3. [Figure 14] This figure shows a battery unit structure according to an embodiment of the present invention. [Figure 15] This figure shows an automobile according to an embodiment of the present invention. [Modes for carrying out the invention]

[0031] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The drawings accompanying this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention later, are intended to further illustrate the technical idea of ​​the present invention; therefore, the present invention shall not be construed as being limited only to what is shown in such drawings. The same reference numerals in the drawings refer to the same components. In addition, in the drawings, the thickness, ratios, and dimensions of components may be exaggerated for the sake of effective illustration of the technical content.

[0032] The terms and words used in this specification and in the claims are not to be interpreted in a manner limited to their ordinary or dictionary meanings, but rather in a manner and concept that corresponds to the technical idea of ​​the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms themselves in order to best describe their invention.

[0033] In this specification, terms such as up, down, left, right, front, and back are used to indicate directions. However, these terms are for illustrative purposes only, and it will be obvious to those skilled in the art that they may vary depending on the position of the object being examined and the observer's position.

[0034] Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention. It should be understood that there are various equivalent and modified embodiments that can be substituted for these at the time of filing this application.

[0035] Figure 1 shows the external appearance of a cylindrical battery according to an embodiment of the present invention. Figure 2 shows the electrode assembly included in the cylindrical battery according to an embodiment of the present invention before winding. Figure 3 shows a part of the cross-section of the cylindrical battery according to an embodiment of the present invention.

[0036] Referring to Figures 1 to 3, the cylindrical battery 10 according to an embodiment of the present invention may include an electrode assembly 100, a battery housing 200, and a flame suppression member 300.

[0037] The electrode assembly 100 may include a first electrode 110, a second electrode 120, and a separator 130 interposed between them. The electrode assembly 100 may have a central hole H1 formed by winding a laminate 100' containing the first electrode 110, the second electrode 120, and the separator 130 around a winding shaft. The electrode assembly 100 may have a central hole H1 formed by winding the first electrode 110, the second electrode 120, and the separator 130 interposed between them around a winding shaft. Referring to Figure 2, the electrode assembly 100 may be manufactured by winding a laminate 100' formed by stacking the first electrode 110, the separator 130, the second electrode 120, and the separator 130 in this order at least once. That is, the electrode assembly 100 applied to embodiments of the present invention may be a jelly roll type electrode assembly 100. The electrode assembly 100 may have a central hole H1 formed approximately in its center and extending along the height direction (parallel to the Z-axis).

[0038] The battery housing 200 can accommodate the electrode assembly 100 through an opening formed on one side (negative Z-axis direction). The battery housing 200 is a substantially cylindrical housing with an opening formed on one side, and may be made of a conductive metal material. The battery housing 200 can also accommodate the electrolyte together with the electrode assembly through the opening. However, the battery housing 200 according to embodiments of the present invention is not limited to this form.

[0039] At least a portion of the flame suppressor 300 may be interposed inside the central hole H1. At least a portion of the flame suppressor 300 may be inserted into the central hole H1.

[0040] Figure 4 shows the deformation of the electrode assembly when a thermal event occurs inside a conventional cylindrical battery. Figure 5 is a 3D view showing the deformation of the electrode assembly when a thermal event occurs inside a conventional cylindrical battery. Figure 6 shows the internal pressure over time when a thermal event occurs inside a conventional cylindrical battery. Figure 7 is an enlarged view of a part of Figure 6 showing the pressure flow.

[0041] In the following section, with reference to Figures 4 to 7, we will explain in detail the problems that arise when thermal events occur inside the battery in the case of the conventional invention.

[0042] Referring to Figures 4 and 5, when a thermal event occurs inside the battery and flames and gases are discharged from the central hole, deformation occurs in the electrode assembly. In particular, significant deformation occurs in the central hole and adjacent parts of the electrode assembly.

[0043] Referring to Figures 6 and 7, the deformation of the electrode assembly in the central hole and adjacent areas is caused by drag force (a force that flows along the core when a thermal event occurs) generated on the inner surface of the central hole. In addition, lift force (a force that acts on the entire J / R when a thermal event occurs) that lifts the electrode assembly as a whole is also one of the causes of deformation of the electrode assembly.

[0044] However, in the cylindrical battery 10 according to the embodiment of the present invention to which the flame suppressing member 300 is applied, deformation of the electrode assembly 100 due to drag force generated along the outer surface of the central hole H1 can be suppressed when a thermal event occurs inside the battery. This is because deformation due to drag force is suppressed when the flame suppressing member 300 is inserted into and fixed in the central hole H1.

[0045] Furthermore, the flame suppressor 300 may include a porous metal. The flame suppressor 300 may include multiple metal meshes. In such cases, the flame suppressor 300 can reduce the intensity of the flame and gas. The high-temperature gas and flame exiting from the central hole can escape through the flame suppressor and strike the porous material, dissipating heat and energy. When the flame and gas come into contact with the flame suppressor 300 containing a porous metal, the flame suppressor 300 can absorb heat. At the same time, the gas can escape through the porous flame suppressor 300. Therefore, the flame suppressor 300 can lower the temperature of the flame and gas by allowing the gas to escape.

[0046] Figure 8 shows a flame suppression member included in a cylindrical battery according to an embodiment of the present invention.

[0047] Referring to Figure 8, the flame suppression member 300 may include a first portion 310 and a second portion 320.

[0048] The first portion 310 may be interposed inside the central hole H1. The first portion 310 may be inserted into the central hole H1. The first portion 310 may have a shape corresponding to the central hole H1. The first portion 310 may be substantially cylindrical in shape. The first portion 310 may have a diameter that is substantially the same as or smaller than the diameter of the central hole H1.

[0049] The second portion 320 may be located outside the central hole H1. At least a portion of the second portion 320 may be located on the electrode assembly 100. The second portion 320 may be coupled to the electrode assembly 100 and / or the first current collector 400, which will be described later.

[0050] The first portion 310 may extend downward (in the negative Z-axis direction) from approximately the center of the lower surface (the surface located in the negative Z-axis direction) of the second portion 320. The first portion 310 and the second portion 320 may be formed integrally. Alternatively, the first portion 310 and the second portion 320 may be manufactured separately and then joined to each other by welding or bolting.

[0051] According to this configuration in the embodiment of the present invention, when the first portion 310 is fitted snugly into the central hole H1, or when the diameter or size of the central hole H1 decreases due to the swelling phenomenon during battery use, the first portion 310 is naturally more securely fixed within the central hole H1, thereby more effectively suppressing deformation of the electrode assembly 100. Furthermore, the second portion 320 can be coupled with the electrode assembly 100 and / or the first current collector 400 to maximize the effect of reducing the intensity of flames and gases.

[0052] Figure 9 is a partial cross-sectional view of a flame suppressor included in a cylindrical battery according to an embodiment of the present invention, showing a flame suppressor with an insulating treatment applied to its surface.

[0053] Referring to Figure 9 in conjunction with Figure 3, the cylindrical battery 10 may be equipped with an insulating member C.

[0054] The insulating member C may be provided between the flame suppressor 300 and the electrode assembly 100. For example, as shown in Figure 9, the insulating member C may be provided between the flame suppressor 300 and the electrode assembly 100 within the central hole H1. In this case, at least a portion of the outer circumferential surface of the first portion 310 may be insulated. However, the surface of the portion of the flame suppressor 300 facing the electrode assembly 100 may be insulated without the use of a separate member.

[0055] According to this configuration in the embodiment of the present invention, even if the separator 130 breaks when the diameter or size of the central hole H1 becomes smaller than necessary due to the swelling phenomenon described above, a short circuit between the electrode assembly 100 and the flame suppression member 300 can be suppressed.

[0056] Figure 10 shows a first current collector 400 included in a cylindrical battery 10 according to an embodiment of the present invention.

[0057] Referring to Figure 10 in conjunction with Figure 3, the cylindrical battery 10 may include the first current collector 400.

[0058] The first current collector 400 may include an electrode assembly coupling portion 410 and a housing coupling portion 420. The electrode assembly coupling portion 410 may be coupled to the first electrode 110. The electrode assembly coupling portion 410 may be formed extending outward from a support portion 430 positioned on the electrode assembly 100. The housing coupling portion 420 may be coupled to the battery housing 200. The housing coupling portion 420 may be formed extending outward from a support portion 430 positioned on the electrode assembly 100. At least a portion of the second portion 320 may be located on the region corresponding to the support portion 430 positioned on the electrode assembly 100.

[0059] The first current collector 400 may have a current collector hole H2 in a portion corresponding to the central hole H1. The flame suppressor 300 may be inserted into the central hole H1 through the current collector hole H2. The first portion 310 may be inserted into the central hole H1 through the current collector hole H2. At least a portion of the flame suppressor 300 may be located within the current collector hole H2. At least a portion of the first portion 310 may be located within the current collector hole H2.

[0060] The current collector hole H2 can function as a passage for inserting a welding rod or irradiating a laser for welding between the battery terminal T and the second current collector P, as described later, or between the battery terminal T and the second electrode 120. It can also function as a passage for smoothly impregnating the electrode assembly 100 with electrolyte when injecting electrolyte into the battery. To more effectively improve this impregnation function, the first current collector 400 may also be provided with an injection hole H3 in the electrode assembly coupling portion 410.

[0061] Figure 11 is a partial cross-sectional view of a flame suppressor included in a cylindrical battery according to an embodiment of the present invention, and shows a flame suppressor that has been insulated at a different position from the flame suppressor shown in Figure 9.

[0062] Referring to Figure 11 in conjunction with Figure 3, the cylindrical battery 10 may be equipped with an insulating member C between the flame suppressor 300 and the first current collector 400. However, the surface of the portion of the flame suppressor 300 facing the first current collector 400 may be insulated without the need for a separate member. Therefore, unnecessary electrical connections between the flame suppressor 300 and the first current collector 400, and short circuits resulting therefrom, can be suppressed.

[0063] Figure 12 is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention.

[0064] Referring to Figure 12, the cylindrical battery 10 may include a top cap 500, terminals T, a second current collector P, and an insulator I.

[0065] Terminal T can be electrically connected to the second electrode 120. Terminal T can be electrically connected to the second electrode 120 by passing through the closed portion of the battery housing 200, which is located on the opposite side of the open portion of the battery housing 200. Terminal T can pass through approximately the center of the closed portion of the battery housing 200. Terminal T can be electrically connected to the electrode assembly 100 by coupling with the second current collector P, which will be described later.

[0066] The second current collector P may be electrically coupled to the second electrode 120. The second current collector P may be electrically coupled to the terminal T. The second current collector P may include a terminal coupling portion that couples with the terminal T and a second coupling portion that couples with the second electrode 120.

[0067] The top cap 500 may be configured to cover the open portion. According to the cylindrical battery 10 of the present invention, in the closed portion where the terminals are provided, the first electrode 110 and the second electrode 120 can be electrically connected via the terminals and the battery housing 200. Therefore, the top cap 500 provided in the open portion on the other side of the closed portion may be configured to have polarity or not.

[0068] The top cap 500 may have a vent section that is more fragile than the surrounding area. The vent section may have a thinner thickness than the surrounding area. The vent section may be formed by providing notchings on one or both sides of the top cap 500 to partially reduce the thickness of the top cap 500. With such a structure, if a malfunction occurs in the battery and the internal pressure of the battery housing 200 rises to a certain level, the vent section may rupture and gas may be released.

[0069] The insulator I may be positioned above the second electrode 120 to provide insulation between the battery housing 200 and the second electrode 120 tab. The insulator I may be interposed between the closure of the battery housing 200 and the electrode assembly 100, or between the closure of the battery housing 200 and the second current collector P. The insulator I may include, for example, an insulating resin material. The insulator I may have a hole approximately in the center so that the terminal T can be electrically connected to the second electrode 120.

[0070] Figure 13 is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention, and shows a cylindrical battery having a different structure compared to Figure 3.

[0071] Referring to Figure 13, the cylindrical battery 10 may be equipped with an insulating member C between the flame suppressor 300 and the top cap 500. However, the surface of the portion of the flame suppressor 300 facing the top cap 500 may be insulated without the need for a separate member. Therefore, the cylindrical battery 10 can suppress unnecessary electrical connections between the flame suppressor 300 and the top cap 500, and the resulting short circuits.

[0072] Referring to Figure 13 in conjunction with Figure 12, the flame suppressor 300 may be interposed between the electrode assembly 100 and the top cap 500. The flame suppressor 300 may have a second portion 320 that has a height corresponding to the distance between the electrode assembly 100 and the top cap 500.

[0073] According to this configuration in the embodiment of the present invention, the flame suppression member 300 can effectively suppress the movement of the electrode assembly 100 within the battery housing 200 due to the play (gap) formed between the top cap 500 and the electrode assembly 100. In particular, referring to Figures 6 and 7, deformation of the electrode assembly 100 due to the lift force described above can be suppressed. Furthermore, the flame suppression member 300 can suppress damage to the joint between the electrode assembly 100 and the first current collector 400, and / or the joint between the first current collector 400 and the battery housing 200.

[0074] Figure 14 shows a battery unit structure 2 according to an embodiment of the present invention.

[0075] Referring to Figure 14, the battery unit structure 2 according to an embodiment of the present invention may include a cylindrical battery 10. For example, the battery unit structure 2 may be a battery module or a battery pack. In addition to the cylindrical battery 10, the battery unit structure 2 may further include various other components, such as a battery management system (BMS), busbars, pack (or module) case, relays, current sensors, and other components of a battery pack or battery module that are known at the time of filing of the present invention.

[0076] Figure 15 shows an automobile 1 according to an embodiment of the present invention.

[0077] Referring to Figure 15, the automobile 1 according to an embodiment of the present invention may include a battery unit structure 2. The automobile 1 may be a hybrid automobile 1 or an electric automobile 1. In addition to such a battery unit structure 2, the automobile 1 according to an embodiment of the present invention may further include various other components included in the automobile 1. For example, the automobile 1 according to an embodiment of the present invention may further include, in addition to the battery unit structure 2 according to an embodiment of the present invention, a vehicle body, a motor, an electronic control unit (ECU), and other control devices.

[0078] Although the present invention has been described above with reference to the accompanying drawings, it will be apparent to those skilled in the art that many diverse and obvious modifications are possible without departing from the scope of the invention. Therefore, the scope of the invention should be interpreted as being encompassed by the claims described to include such many modified embodiments. [Explanation of symbols]

[0079] 10 Cylindrical batteries 100 electrode assembly 100' laminate 110 First electrode 120 Second electrode 130 Separator 200 Battery Housing 300 Flame suppression material 310 Part 1 320 Part 2 400 First current collector 410 Electrode assembly joint 420 Housing joint 430 Support part 500 Top Cap

Claims

1. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed between them, wherein the electrode assembly has a central hole formed by winding a laminate comprising the first electrode, the second electrode, and the separator around a winding shaft, A battery housing that accommodates the electrode assembly through an opening formed on one side, A flame suppressing member is interposed inside the central hole, Includes, The flame suppression member is a cylindrical battery that closes one end of the central hole and extends from that end toward the portion of the central hole between the one end and the other end.

2. The flame suppressing member is The first portion interposed inside the central hole, A second portion located outside the central hole, A cylindrical battery according to claim 1, including the following:

3. The cylindrical battery according to claim 2, wherein the flame suppression member has a shape in which the first portion corresponds to the central hole.

4. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed between them, wherein the electrode assembly comprises a central hole formed by winding a laminate including the first electrode, the second electrode, and the separator around a winding shaft, A battery housing that accommodates the electrode assembly through an opening formed on one side, A flame suppressing member is interposed inside the central hole, Includes, The flame suppressing member is The first portion interposed inside the central hole, A second portion located outside the central hole, Includes, The flame suppression member is a cylindrical battery in which at least a portion of the second part is located on the electrode assembly.

5. The cylindrical battery according to claim 4, wherein the cylindrical battery is provided with an insulating member between the flame suppressor and the electrode assembly.

6. The cylindrical battery according to claim 2 or 3, wherein the cylindrical battery includes a first current collector which includes an electrode assembly coupling portion that is coupled to the electrode assembly and a housing coupling portion that is coupled to the battery housing.

7. The cylindrical battery according to claim 6, wherein the first current collector has a current collector hole in a portion corresponding to the central hole.

8. The cylindrical battery according to claim 7, wherein at least a portion of the first part of the flame suppression member is located within the current collector hole.

9. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed therebetween, wherein the electrode assembly comprises a central hole formed by winding a laminate including the first electrode, the second electrode, and the separator around a winding shaft, A battery housing that accommodates the electrode assembly through an opening formed on one side, A flame suppressing member is interposed inside the central hole, A cylindrical battery including, The flame suppressing member is The first portion interposed inside the central hole, A second portion located outside the central hole, Includes, The cylindrical battery includes a first current collector which includes an electrode assembly coupling portion that connects to the electrode assembly and a housing coupling portion that connects to the battery housing. The cylindrical battery is a cylindrical battery comprising an insulating member between the flame suppression member and the first current collector.

10. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed therebetween, wherein the electrode assembly comprises a central hole formed by winding a laminate including the first electrode, the second electrode, and the separator around a winding shaft, A battery housing that accommodates the electrode assembly through an opening formed on one side, A flame suppressing member is interposed inside the central hole, Includes, The flame suppression member is a cylindrical battery containing a porous metal.

11. The cylindrical battery according to claim 2 or 3, wherein the cylindrical battery includes a top cap configured to cover the opening.

12. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed between them, wherein the electrode assembly comprises a central hole formed by winding a laminate including the first electrode, the second electrode, and the separator around a winding shaft, A battery housing that accommodates the electrode assembly through an opening formed on one side, A flame suppressing member is interposed inside the central hole, Includes, The flame suppressing member is The first portion interposed inside the central hole, A second portion located outside the central hole, A cylindrical battery including, The cylindrical battery includes a top cap configured to cover the opening, The flame suppression member is a cylindrical battery in which the second portion has a height corresponding to the distance between the electrode assembly and the top cap.

13. The cylindrical battery according to claim 12, wherein the cylindrical battery comprises an insulating member between the flame suppressor and the top cap.

14. A battery unit structure comprising the cylindrical battery described in claim 1.

15. An automobile comprising the battery unit structure described in claim 14.

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