Batteries, battery packs containing them, and automobiles

Abstract

A battery according to an embodiment of the present invention may include: an electrode assembly; a battery housing configured to receive the electrode assembly through an opening formed on one side; a cap configured to cover the opening of the battery housing; and a gasket interposed between the cap and an inner surface of the battery housing and at least partially compressed, the gasket having a protrusion on a surface facing the cap that protrudes in a direction toward the cap relative to a state before compression.

Description

Technical Field

[0001] The present invention relates to a battery, a battery pack including the same, and a vehicle.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0174042 filed on December 13, 2022, and all of the content disclosed in the specification and drawings of the application is incorporated herein.

Background Art

[0003] Batteries with high applicability to product groups and having electrical characteristics such as high energy density are not only applied to portable devices, but also widely applied to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by an electric drive source.

[0004] Such batteries have not only the primary advantage of being able to dramatically reduce the use of fossil fuels, but also the advantage of generating no by-products associated with energy use, and thus are attracting attention as a new energy source for environmental friendliness and energy efficiency improvement.

[0005] Currently widely used battery types include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a single battery cell is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a plurality of batteries may be connected in series to form a battery pack. Also, depending on the charge / discharge capacity required for the battery pack, a plurality of batteries may be connected in parallel to form a battery pack. Therefore, the number of batteries included in the battery pack and the form of electrical connection can be variously set according to the required output voltage and / or charge / discharge capacity.

[0006] If an abnormality occurs during battery use, the internal pressure of the battery may rise, generating high-temperature gases and / or flames inside, potentially causing a thermal event to spread. Such a thermal event in a high-capacity and / or high-output battery could result in greater damage.

[0007] To prevent this, batteries may be equipped with vents that allow internal gases to be released if the internal pressure rises above a certain level. However, if the seals for sealing the battery are not robustly designed, they may not function smoothly at predictable times. Also, if the seals for sealing the battery are not robustly designed, it may not be possible to guide venting in the desired direction through the vents. Furthermore, if the seals for sealing the battery are not robustly designed, even under normal battery use, changes in internal pressure may cause leaks from the seals, leading to problems such as electrolyte leakage.

[0008] Therefore, there is a need to develop batteries that are designed to prevent the battery's seals from rupturing if an abnormality occurs during battery use and the internal pressure rises abnormally, or even if the internal pressure rises under normal operating conditions. [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention has been made in view of the above problems, and aims to provide a battery configured so that the seal portion of the battery does not rupture when an abnormality occurs during the battery's use process and the internal pressure rises abnormally, or when the internal pressure rises even under normal use conditions.

[0010] However, the technical problems that this invention aims to solve are not limited in any way 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]

[0011] A battery according to one embodiment of the present invention for solving the above-mentioned problems may include: an electrode assembly; a battery housing configured to house the electrode assembly through an opening formed on one side; a cap configured to cover the opening of the battery housing; and a gasket interposed between the cap and the inner surface of the battery housing and at least partially compressed, with a projection on the surface facing the cap having a shape that protrudes toward the cap, relative to its state before compression.

[0012] The aforementioned protrusions are numerous, and the multiple protrusions may be arranged in a direction parallel to the direction from the outside to the inside of the battery housing.

[0013] When the gasket is compressed between the cap and the inner surface of the battery housing, the shape of the protrusion may not appear on the surface facing the cap, and the gasket may have a flat shape.

[0014] When the gasket is compressed between the cap and the inner surface of the battery housing, a gap can be formed between adjacent protrusions.

[0015] The gasket may be configured to have different compression ratios in the region where the protrusion is provided and in the region where the protrusion is not provided.

[0016] The battery housing may have a shape that is bent so as to enclose the peripheral area of ​​the cap on the open side.

[0017] The gasket may be configured to enclose the peripheral region of the cap by being bent into a shape corresponding to the bent shape of the battery housing.

[0018] The protrusion may be provided in the gasket in at least one of the regions facing the inner surface of the cap and the region facing the outer surface of the cap.

[0019] The cap may include a vent portion configured to have lower rigidity compared to other areas of the cap.

[0020] The cap may be configured so as not to be electrically connected to the electrode assembly.

[0021] The cap may include an insertion portion that is inserted into a space formed between a pair of adjacent protrusions.

[0022] The gasket may have sub-protrusions that protrude toward the inner surface of the battery housing, relative to its state before compression.

[0023] A battery pack according to one embodiment of the present invention may include the battery.

[0024] An automobile according to one embodiment of the present invention may include the battery pack. [Effects of the Invention]

[0025] According to one aspect of the present invention, it is possible to prevent the seal portion of the battery from rupturing when an abnormality occurs during the battery's use process and the internal pressure rises abnormally, or when the internal pressure rises even under normal use conditions.

[0026] However, the advantageous effects obtained by the present invention are not limited in any way to those described above, and other advantageous effects not mentioned should be clearly understood by those skilled in the art from the description of the invention below.

[0027] The drawings attached to this specification illustrate desirable embodiments of the present invention and are for the purpose of further understanding the technical idea of the present invention together with the content of the invention. Therefore, the present invention is not to be construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0028] [Figure 1] It is a diagram showing the upper portion structure of a battery according to an embodiment of the present invention. [Figure 2] It is a diagram showing the structure of a gasket according to an embodiment of the present invention. [Figure 3] It is a diagram showing a state where a gasket according to an embodiment of the present invention is compressed by a cap. [Figure 4] It is a diagram showing a state where a gasket according to an embodiment of the present invention is compressed by a cap. [Figure 5] It is a partially enlarged view of FIG. 1. [Figure 6] It is a diagram showing the structure of a gasket according to an embodiment of the present invention, and shows an embodiment different from the gasket shown in FIG. 2. [Figure 7] It is a diagram showing a battery structure provided with a vent portion. [Figure 8] It is a diagram showing the lower portion structure of a battery according to an embodiment of the present invention. [Figure 9] It is a diagram showing an insertion portion provided in a cap according to an embodiment of the present invention. [Figure 10] It is a diagram showing the structure of a gasket according to an embodiment of the present invention, and shows an embodiment different from the gaskets shown in FIGS. 2 and 6. [Figure 11] It is a diagram showing a battery pack according to an embodiment of the present invention. [Figure 12] It is a diagram showing an automobile according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0029] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims are not to be interpreted in a manner limited to their usual or dictionary meanings, but rather in a manner corresponding to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concept of terms in order to best describe the invention. Accordingly, the embodiments described herein and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and it should be understood that there are various equivalents and modifications that can be substituted thereat the time of this application.

[0030] A battery 1 according to one embodiment of the present invention will be described with reference to Figures 1 to 5.

[0031] Figure 1 shows the upper portion structure of a battery according to one embodiment of the present invention, and Figure 2 shows the structure of a gasket according to an embodiment of the present invention. Figures 3 and 4 show the gasket according to an embodiment of the present invention compressed by a cap, and Figure 5 is a partially enlarged view of Figure 1.

[0032] First, referring to Figures 1 to 4, a battery 1 according to one embodiment of the present invention may include an electrode assembly 10, a battery housing 20, a cap 30, and a gasket 40. The battery 1 may be a secondary battery. The battery 1 may be a cylindrical battery.

[0033] The electrode assembly 10 may include a first electrode (positive or negative electrode), a second electrode (an electrode having the opposite polarity to the first electrode), and a separator (separation membrane) interposed between the first electrode and the second electrode. The electrode assembly 10 may be, for example, a jelly roll type electrode assembly formed by winding up a laminate including the first electrode, the second electrode, and the separator.

[0034] The battery housing 20 may be configured to house the electrode assembly 10 through an opening provided on one side. The battery housing 20 may contain a conductive metal. The battery housing 20 may be electrically connected to the electrode assembly 10. An electrolyte may be housed inside the battery housing 20 together with the electrode assembly 10.

[0035] The cap 30 may be configured to cover the opening of the battery housing 20. The cap 30 may contain metal. A gasket 40, described later, may be applied to the opening of the battery housing 20 covered by the cap 30, thereby improving the sealing force at the opening of the battery housing 20 covered by the cap 30.

[0036] The gasket 40 may be interposed between the cap 30 and the inner surface of the battery housing 20. The gasket 40 may include an elastic material. The gasket 40 may include an insulating material. When the gasket 40 functions as an insulator, insulation between the cap 30 and the battery housing 20 can be achieved. However, in the present invention, the gasket 40 does not necessarily have to function as an insulator. In an embodiment of the present invention, the battery 1 may have a structure in which the cap 30 is not electrically connected to the electrode assembly 10, in which case the cap 30 may not function as a terminal of the battery 1.

[0037] The gasket 40 can be compressed at least partially between the cap 30 and the battery housing 20. The gasket 40 may have a projection 41. The projection 41 may be provided on the outer surface of the gasket 40 that faces the cap 30. The projection 41 may have a shape that protrudes toward the cap 30.

[0038] The structure in which a protrusion 41 is provided on the outer surface of the gasket 40 may be a structure in which the gasket 40 appears before it is interposed between the cap 30 and the inner surface of the battery housing 20 and compressed.

[0039] As shown in Figure 3, when the gasket 40 is interposed between the cap 30 and the battery housing 20 and compressed, the protrusion 41 may not be visible. That is, when the gasket 40 is compressed between the cap 30 and the inner surface of the battery housing 20, the shape of the protrusion 41 does not appear on the surface facing the cap 30, and the gasket 40 may have a substantially flat shape. In contrast, as shown in Figure 4, even when the gasket 40 is interposed between the cap 30 and the battery housing 20 and compressed, the protrusion 41 may be partially visible. As shown in Figure 4, when the protrusion 41 is partially visible even in the compressed state, a gap S may be formed between a pair of adjacent protrusions 41. The gap S may be surrounded by a pair of adjacent protrusions 41 and the cap 30.

[0040] On the other hand, the gasket 40 may have different compression ratios in the region where the protrusion 41 is provided and in the region where the protrusion 41 is not provided, based on the compressed state between the cap 30 and the battery housing 20. In the gasket 40, the compression ratio in the region where the protrusion 41 is provided may be greater than the compression ratio in the region where the protrusion 41 is not provided.

[0041] This phenomenon, where the compression ratio differs depending on the region, can commonly occur when the shape of the gasket 40 in the compressed state is flat, as shown in Figure 3, and when the protruding portion 41 is partially protruding, as shown in Figure 4.

[0042] Thus, when a protrusion 41 is provided on the gasket 40, the shear resistance formed between the gasket 40 and the cap 30 in the region where the protrusion 41 is formed can be increased. The protrusion 41 may have a shape in which the cross-sectional area decreases towards the end. When the protrusion 41 has such a shape, the effect of increasing the shear resistance in the region where the protrusion 41 is formed can be further enhanced.

[0043] The protrusions 41 can be multiple. In this case, the multiple protrusions 41 can be arranged in a direction parallel to the direction from the outside to the inside of the battery housing 20. If the battery 1 is a cylindrical battery, the multiple protrusions 41 can be arranged in a direction substantially radial to the battery 1. When the multiple protrusions 41 are arranged in this way, the shear resistance force of the multiple protrusions 41 can be maximized when pressure is applied in a direction that opens the cap 30 in response to an increase in the internal pressure of the battery 1. That is, when the internal pressure of the battery 1 increases, an opening pressure can act on the interface between the cap 30 and the gasket 40 in a direction from the outside to the inside of the battery 1. Therefore, arranging the multiple protrusions 41 in a direction substantially parallel to the direction in which such an opening pressure acts is advantageous for maximizing shear resistance.

[0044] Referring to Figure 5, the battery housing 20 may have a shape that is folded to enclose the peripheral region of the cap 30 on the open side. In this case, the gasket 40 may be configured to enclose the peripheral region of the cap 30 by being folded to a shape corresponding to the folded shape of the battery housing 20.

[0045] For example, a battery housing 20 according to an embodiment of the present invention may include a beading portion 21 having a shape in which the periphery of its outer surface is recessed inward. The battery housing 20 may also include a crimping portion 22 extending from the upper side of the beading portion 21 and having a shape that is bent to enclose the peripheral region of the cap 30.

[0046] Next, referring to Figures 5 and 6, the position of the protrusion 41 will be described in the case where the battery housing 20 and gasket 40 are folded together to enclose the peripheral region of the cap 30, as described above.

[0047] Figure 6 shows the structure of a gasket according to an embodiment of the present invention, and is a diagram showing an embodiment different from the gasket shown in Figure 2.

[0048] Referring to Figures 5 and 6, the protrusion 41 according to the embodiment of the present invention may be provided in the gasket 40 in at least one of the region facing the inner surface of the cap 30 and the region facing the outer surface of the cap 30.

[0049] As described above, the gasket 40 may be configured to be folded together with the battery housing 20 to wrap around the periphery of the cap 30. In this way, a portion of the gasket 40 may face the outer surface of the cap 30 (the upper surface of the cap 30 according to Figure 6), and another portion may face the inner surface of the cap 30 (the lower surface of the cap 30 according to Figure 6). In this case, the protrusion 41 may be provided in the region facing the outer surface of the cap 30 and / or the region facing the inner surface of the cap 30.

[0050] When the protrusions 41 are provided in both the region facing the outer surface of the cap 30 and the region facing the inner surface of the cap 30, the shear resistance at the interface between the gasket 40 and the cap 30 can be maximized.

[0051] Next, with reference to Figure 7, the vent portion 31 provided on the cap 30 according to an embodiment of the present invention will be described.

[0052] Figure 7 shows a battery structure that includes a vent.

[0053] Referring to Figure 7, the cap 30 may include a vented portion 31 configured to have lower rigidity compared to other areas of the cap 30. The vented portion 31 may be, for example, an area with lower thickness compared to other areas of the cap 30. The vented portion 31 may be, for example, an area in which notches are formed on both sides of the cap 30. The vented portion 31 may have a shape that extends to form a closed loop surrounding the center of the cap 30. The vented portion may be formed continuously or discontinuously.

[0054] Therefore, by providing the vent portion 31 in the battery 1 according to the embodiment of the present invention, it is possible to prevent the internal pressure of the battery 1 from rising above a certain level even if an abnormality occurs in the battery 1. In the embodiment of the present invention, the venting time can be adjusted according to the specifications of the battery 1 by appropriately adjusting the breaking strength of the vent portion 31. However, in order to adjust the venting time using the vent portion 31, it is important to prevent leakage from occurring at locations other than the vent portion 31 until a preset venting pressure is reached. Therefore, it is necessary to increase the shear resistance at the interface between the gasket 40 and the cap 30 by applying the gasket 40 having the protrusion portion 41 as described above.

[0055] Referring to Figures 1 and 7, a battery 1 according to one embodiment of the present invention may include a current collector (first current collector) 50. The current collector 50 may be configured to electrically connect the first electrode of the electrode assembly 10 to the battery housing 20. The current collector 50 may be positioned on one surface of the electrode assembly 10. The current collector 50 may be electrically coupled to a first blank portion of the electrode assembly 10. The first electrode of the electrode assembly 10 may have a first blank portion at one end thereof that extends along the winding direction. Thus, a first blank portion may be provided on the first surface of the electrode assembly 10. The first blank portion may, for example, extend upward of the electrode assembly 10. The current collector 50 may be interposed between the gasket 40 and the inner surface of the battery housing 20. The current collector 50 may, for example, be coupled to the beading portion 21 (see Figure 5) of the battery housing 20.

[0056] Next, with reference to Figure 8, the lower portion structure of the battery 1 according to one embodiment of the present invention will be described.

[0057] Figure 8 shows the lower structure of a battery according to one embodiment of the present invention.

[0058] Referring to Figure 8, the battery 1 according to one embodiment of the present invention may include terminals 60.

[0059] The terminal 60 may be configured to be electrically connected to the electrode assembly 10 via a closed portion provided on the opposite side of the open portion of the battery housing 20. The terminal 60 may be configured to be exposed to the outside of the battery housing 20 via the closed portion of the battery housing 20. The terminal 60 may be riveted to the inner surface of the closed portion of the battery housing 20.

[0060] The terminal 60 can be electrically connected, for example, to a second blank portion of the electrode assembly 10. The second electrode of the electrode assembly 10 may have a second blank portion extending along the winding direction at one end thereof. This allows a second blank portion to be provided on a second surface of the electrode assembly 10 (the surface opposite to the first surface on which the first blank portion is provided). The second blank portion may extend downward, for example, to the electrode assembly 10. The terminal 60, electrically connected to the second electrode of the electrode assembly 10 in this way, is exposed to the outside of the battery housing 20 and can function as the second electrode terminal of the battery 1.

[0061] A battery 1 according to one embodiment of the present invention may include an insulating member 70. The insulating member 70 may be interposed between the terminal 60 and the battery housing 20. The insulating member 70 may include a material having electrical insulation and chemical resistance to electrolytes. The insulating member 70 may be configured to prevent electrical connection between the terminal 60 and the battery housing 20. The insulating member 70 may include a material having electrical insulation properties. The terminal 60 and the battery housing 20 may have opposite polarities, in which case the insulating member 70 may be configured to prevent a short circuit due to contact between the terminal 60 and the battery housing 20. Thus, the battery 1 may be configured such that the closing portion of the battery housing 20 functions as a first electrode terminal having a first polarity, and the terminal 60 functions as a second electrode terminal having a second polarity. Therefore, when a battery pack is formed by connecting multiple batteries 1 according to embodiments of the present invention, all electrical connections can be made on one side.

[0062] The insulating member 70 can be deformed together with the terminal 60 when it is riveted inside the battery housing 20. Through such deformation, the insulating member 70 can be interposed between the inner surface of the closed portion of the battery housing 20 and the terminal 60.

[0063] A battery 1 according to one embodiment of the present invention may include a current collector (second current collector) 80. The current collector 80 may be provided between the electrode assembly 10 and the terminal 60. The current collector 80 may be configured to electrically connect the electrode assembly 10 and the terminal 60. The current collector 80 may be positioned between the electrode assembly 10 and the inner surface of the closing portion of the battery housing 20. The current collector 80 may be configured to electrically connect the second electrode of the electrode assembly 10 and the terminal 60. The current collector 80 may be electrically coupled to the second blank portion of the electrode assembly 10.

[0064] A battery 1 according to one embodiment of the present invention may include an insulator 90. The insulator 90 may be interposed between the electrode assembly 10 and the closing portion of the battery housing 20. The insulator 90 may include an electrically insulating material. The insulator 90 may have an insulator hole having an inner diameter equal to or smaller than the outer diameter of the joint of the terminal 60 and the insulating member 70. The terminal 60 may be exposed toward the electrode assembly 10 through the insulator hole.

[0065] Next, with reference to Figure 9, an embodiment of the present invention in which the cap 30 is provided with an insertion portion 32 will be described.

[0066] Figure 9 shows an insertion portion provided in a cap according to an embodiment of the present invention.

[0067] Referring to Figure 9, the cap 30 according to an embodiment of the present invention may include an insertion portion 32. The insertion portion 32 may be configured to be inserted into a void space S formed between a pair of adjacent protrusions 41. The insertion portion 32 may have a shape in which the cross-sectional area decreases along the direction toward the gasket 40. The insertion portion 32 may be provided in a region facing the gasket 40. The insertion portion 32 may be provided on one or both sides of the cap 30. There may be multiple insertion portions 32, in which case each of the multiple insertion portions 32 may be inserted into each of the multiple void spaces S formed in the gasket 40.

[0068] The insertion portion 32 may be configured to compress the bottom surface of the empty space S in the gasket 40. Alternatively, the insertion portion 32 may be positioned at a distance from the bottom surface of the empty space S in the gasket 40. Whether the gasket 40 is compressed by the insertion portion 32 may be determined by the height of the protrusion 41 and / or the height of the insertion portion 32.

[0069] Thus, when the cap 30 according to the embodiment of the present invention is equipped with an insertion portion 32, the matching structure of the cap 30 and the gasket 40 allows the protruding portion 41 to function as a stopper when the insertion portion 32 moves inward along the substantially radial direction of the battery 1. Alternatively, even if the protruding portion 41 of the gasket 40 is not visually apparent when the gasket 40 is compressed, the pressing force on the gasket 40 can be improved in the region where the insertion portion 32 is formed. Therefore, the shear stress can be improved across the entire interface between the cap 30 and the gasket 40.

[0070] Next, with reference to Figure 10, the sub-protrusions 42 provided on the gasket 40 according to an embodiment of the present invention will be described.

[0071] Figure 10 shows the structure of a gasket according to an embodiment of the present invention, and is a diagram showing an embodiment different from the gaskets shown in Figures 2 and 6.

[0072] Referring to Figure 10, the gasket 40 may have a sub-projection 42 that protrudes toward the inner surface of the battery housing 20, relative to its state before compression. In a structure in which the sub-projection 42 is provided on the outer surface of the gasket 40, the gasket 40 may appear in the state before it is interposed between the cap 30 and the battery housing 20 and compressed.

[0073] When the gasket 40 is interposed between the cap 30 and the battery housing 20 and compressed, the sub-protrusions 42 may not be visible. That is, when the gasket 40 is compressed between the cap 30 and the inner surface of the battery housing 20, the shape of the sub-protrusions 42 may not be visible on the surface facing the battery housing 20, and the gasket 40 may have a substantially flat shape. Conversely, even when the gasket 40 is interposed between the cap 30 and the battery housing 20 and compressed, the sub-protrusions 42 may be partially visible. If the sub-protrusions 42 are partially visible even in the compressed state, a gap may be formed between a pair of adjacent sub-protrusions 42. This gap may be surrounded by a pair of adjacent sub-protrusions 42 and the battery housing 20.

[0074] Thus, when the gasket 40 is provided with a sub-projection 42, the shear resistance formed between the gasket 40 and the battery housing 20 in the region where the sub-projection 42 is formed can be increased. The sub-projection 42 may have a shape in which the cross-sectional area decreases towards the end. When the sub-projection 42 has such a shape, the effect of increasing the shear resistance in the region where the sub-projection 42 is formed can be further improved.

[0075] The sub-protrusions 42 can be multiple. In this case, the multiple sub-protrusions 42 can be arranged in a direction parallel to the direction from the outside to the inside of the battery housing 20. If the battery 1 is a cylindrical battery, the multiple sub-protrusions 42 can be arranged in a direction substantially radial to the battery 1. When the multiple sub-protrusions 42 are arranged in this way, when pressure is applied in a direction that opens the cap 30 in response to an increase in the internal pressure of the battery 1, the multiple sub-protrusions 42 can maximize the shear resistance at the interface between the inner surface of the battery housing 20 and the gasket 40. That is, when the internal pressure of the battery 1 increases, an opening pressure can act on the interface between the battery housing 20 and the gasket 40 in a direction from the outside to the inside of the battery 1. Therefore, arranging the multiple sub-protrusions 42 in a direction substantially parallel to the direction in which such an opening pressure acts is advantageous for maximizing shear resistance.

[0076] Next, with reference to Figure 11, a battery pack 3 according to one embodiment of the present invention will be described.

[0077] Figure 11 shows a battery pack according to one embodiment of the present invention.

[0078] Referring to Figure 11, a battery pack 3 according to one embodiment of the present invention may include at least one battery 1 according to the embodiments of the present invention described above. The battery 1 may be housed in a pack housing 2. The battery pack 3 may include components for electrically connecting the battery 1 and / or a battery management system (BMS) configured to control the charging and discharging of the battery 1.

[0079] Next, with reference to Figure 12, an automobile 5 according to one embodiment of the present invention will be described.

[0080] Figure 12 shows an automobile according to one embodiment of the present invention.

[0081] Referring to Figure 12, an automobile 5 according to one embodiment of the present invention includes at least one battery pack 3. The automobile 5 may be configured to operate by being powered by the battery pack 3. The automobile 5 may be, for example, a hybrid electric vehicle (HEV) or an electric vehicle (EV).

[0082] Although the present invention has been described above with reference to limited embodiments and drawings, it goes without saying that the present invention is not limited thereto, and that various modifications and variations are possible within the equivalent scope of the technical idea of ​​the present invention and the appended claims by persons with ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0083] 1 Battery 2-pack housing 3 Battery Packs 5. Automobile 10 Electrode assembly 20 Battery Housing 21 Beading section 22 Crimping section 30 caps 31 Vent section 32 Insertion part 40 Gasket 41 Protrusion 42 Sub-protrusion S (empty space) 50 Current collector (1st current collector) 60 terminals 70 Insulating material 80 Current collector (second current collector) 90 Insulators

Claims

1. Electrode assembly and A battery housing configured to accommodate the electrode assembly through an opening formed on one side, A cap configured to cover the opening portion of the battery housing, A gasket interposed between the cap and the inner surface of the battery housing, and at least partially compressed, and having a projection on the surface facing the cap that protrudes in the direction toward the cap, relative to its state before compression, Includes, The aforementioned cap is The cap is equipped with a vent portion configured to have lower rigidity compared to other areas of the cap. The aforementioned cap is A battery that is not electrically connected to the aforementioned electrode assembly.

2. The aforementioned protrusions are multiple, The battery according to claim 1, wherein the plurality of protrusions are provided along a direction parallel to the direction from the outside to the inside of the battery housing.

3. The aforementioned gasket is The battery according to claim 1 or 2, wherein, when compressed between the cap and the inner surface of the battery housing, the shape of the protrusion does not appear on the surface facing the cap, and the battery has a flat shape.

4. The battery according to claim 2, wherein when the gasket is compressed between the cap and the inner surface of the battery housing, a gap is formed between adjacent protrusions.

5. The aforementioned gasket is The battery according to claim 1 or 2, having different compression ratios in the region where the protrusion is provided and in the region where the protrusion is not provided.

6. The aforementioned battery housing is The battery according to claim 1 or 2, having a shape that is folded so as to enclose the peripheral region of the cap on the open side.

7. The aforementioned gasket is The battery according to claim 6, wherein the battery is bent into a shape corresponding to the bent shape of the battery housing, thereby enclosing the peripheral region of the cap.

8. The aforementioned protrusion is The battery according to claim 7, wherein the gasket is provided in at least one of the region facing the inner surface of the cap and the region facing the outer surface of the cap.

9. The aforementioned cap is The battery according to claim 2, comprising an insertion portion that is inserted into a space formed between a pair of adjacent protrusions.

10. The aforementioned gasket is The battery according to claim 1 or 2, comprising a sub-protrusion having a shape that protrudes toward the inner surface of the battery housing, based on the state before compression.

11. A battery pack comprising the battery according to claim 1 or 2.

12. An automobile comprising the battery pack described in claim 11.

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