Electrode assembly, and battery and battery pack comprising same

Abstract

An electrode assembly according to the present invention includes: a winding center hole and an outer circumferential surface that are formed by winding a stack, including a first electrode, a second electrode, and a separator interposed therebetween, around a winding axis; and a fixing member covering at least a portion of the outer circumferential surface along the circumferential direction of the outer circumferential surface.

Description

Electrode assembly, and battery and battery pack including the same

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

[0002] This application claims priority to Korean Patent Application No. 10-2023-0193122, filed on December 27, 2023, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0003] Batteries with high applicability according to product group and electrical characteristics such as high energy density are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electrical power sources.

[0004] These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can drastically reduce the use of fossil fuels, but also because they produce no byproducts from energy use.

[0005] Commonly used battery types today include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. These individual batteries operate at a voltage of approximately 2.5 V to 4.5 V. Therefore, if a higher output voltage is required, multiple batteries are connected in series to form a battery pack. Furthermore, depending on the required charge / discharge capacity, multiple batteries are connected in parallel to form a battery pack. Therefore, the number of batteries and the electrical connection configuration included in a battery pack can vary depending on the required output voltage and / or charge / discharge capacity.

[0006] Meanwhile, cylindrical, square, and pouch-shaped batteries are known as battery types. In the case of batteries, a separator, which acts as an insulator, is interposed between the positive and negative electrodes, and the separator is wound to form a jelly-roll-shaped electrode assembly, which is then inserted into the battery housing along with an electrolyte.

[0007] These jellyroll-shaped electrode assemblies are produced by winding laminates comprising a positive electrode, a negative electrode, and a separator. The closer the jellyroll is to a circular shape, the better its energy density and service life. Therefore, it is crucial to maintain the standard deviation of cylindricality as consistent as possible during the production process, as well as the difference between the maximum and minimum outer diameters.

[0008] However, in the past, there was a problem in which the standard deviation of cylindricality and the standard deviation of the difference between the maximum and minimum outer diameters became excessively large after battery activation, even though the standard deviation of cylindricality and the standard deviation of the difference between the maximum and minimum outer diameters were small before battery activation.

[0009] The present invention was created in consideration of the above-described problems, and has as its primary purpose the provision of an electrode assembly in which the standard deviation of cylindricality and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter are improved after activation of the battery.

[0010] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0011] According to one embodiment of the present invention, a battery comprises a laminate including a first electrode, a second electrode, and a separator interposed therebetween, which is wound around a winding axis to form a winding center hole and an outer peripheral surface, and can cover at least a portion of the outer peripheral surface along a circumferential direction of the outer peripheral surface.

[0012] The above-mentioned fixed member can cover at least a portion of an area corresponding to the separator on the outer surface.

[0013] The above-mentioned fixing member can cover at least a portion of the end where the winding of the laminate ends.

[0014] The lower end of the above-mentioned fixing member may be positioned at the same height as or higher than the lower end of the above-mentioned separator. The distance between the lower end of the above-mentioned fixing member and the lower end of the above-mentioned separator may be approximately 0.055 times or less of the height of the above-mentioned separator.

[0015] The upper end of the above fixed member may be lower than the upper end of the above separator by approximately 0.04 to 0.1 times the height of the above separator.

[0016] The first electrode may protrude from the upper portion of the separator, and the second electrode may protrude from the lower portion of the separator.

[0017] The first electrode may be an anode, and the second electrode may be a cathode.

[0018] A battery according to one embodiment of the present invention may include an electrode assembly according to the present invention.

[0019] A battery pack according to one embodiment of the present invention may include a battery according to the present invention.

[0020] A vehicle according to one embodiment of the present invention may include a battery pack according to the present invention.

[0021] According to one aspect of the present invention, unwinding of a wound electrode assembly can be effectively prevented. The fixing member covers a portion of the entire circumferential area of ​​the outer surface at an appropriate ratio to maximize the effect of preventing unwinding of the laminate and also maximize the energy density of the electrode assembly. When the fixing member is wound more than once around the outer surface, the fixing member may protrude outside the outer surface due to tolerances. However, the present invention can prevent this phenomenon.

[0022] According to another aspect of the present invention, it is possible to prevent or minimize the phenomenon in which the standard deviation of the cylindrical shape of the electrode assembly and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter increase after activation of the battery, thereby producing a battery in which the electrode assembly has a shape as close as possible to a perfect cylinder over the entire area.

[0023] FIG. 1 is a drawing showing a laminate forming an electrode assembly according to one embodiment of the present invention.

[0024] Figures 2 to 4 are drawings showing an electrode assembly according to one embodiment of the present invention.

[0025] FIG. 5 is a drawing showing a battery according to one embodiment of the present invention.

[0026] FIG. 6 is a drawing showing a first collector included in a battery according to one embodiment of the present invention.

[0027] FIG. 7 is a drawing showing a cross-section of a battery according to one embodiment of the present invention.

[0028] FIG. 8 is a drawing showing a second collector included in a battery according to one embodiment of the present invention.

[0029] FIG. 9 is a drawing showing a cross-section of a battery according to one embodiment of the present invention.

[0030] Fig. 10 is a drawing showing a battery to which the insulating member of the present invention is applied.

[0031] FIG. 11 is a drawing showing a battery pack according to one embodiment of the present invention.

[0032] Figure 12 is a drawing showing a vehicle according to the present invention.

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be construed as being limited to the matters described in the drawings. Like reference numerals designate like components. Furthermore, in the drawings, the thicknesses, ratios, and dimensions of components may be exaggerated for the purpose of effectively explaining the technical contents.

[0034] Terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0035] Although terms indicating directions such as up, down, left, right, front, and back are used in this specification, it is obvious to those skilled in the art that these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0036] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0037] FIG. 1 is a drawing showing a laminate (10') forming an electrode assembly (10) according to one embodiment of the present invention. FIGS. 2 to 4 are drawings showing an electrode assembly (10) according to one embodiment of the present invention.

[0038] Referring to FIGS. 1 to 4, the electrode assembly (10) according to the present invention includes a first electrode (11), a second electrode (13), a separator (15), and a fixing member (20).

[0039] Referring to Fig. 1, a laminate (10') including a first electrode (11), a second electrode (13) and a separator (15) interposed therebetween can be wound around a winding axis. By being wound, the laminate (10') can form a winding center hole (H) and an outer peripheral surface (O).

[0040] For example, a laminate (10') in which a first electrode (11), a separator (15), a second electrode (13), and a separator (15) are sequentially laminated can be wound around a winding axis. A pair of separators (15) can be formed longer than the first electrode (11) and the second electrode (13) and can be wound first by a winding core. The first electrode (11) and the second electrode (13) can be wound together by entering between the separators (15) where the winding is started first. The separator (15) can be formed longer than the first electrode (11) and the second electrode (13) and can cover the first electrode (11) and the second electrode (13) after the winding is completed. The separator (15) can be positioned on the outer circumferential surface (O) of the electrode assembly (10) after the winding is completed. That is, the outermost side of the electrode assembly (10) can be covered by the separator (15).

[0041] The fixing member (20) can cover at least a portion of the outer circumferential surface (O) along the circumferential direction of the outer circumferential surface (O). The fixing member (20) can cover at least a portion of an area corresponding to the separator (15) of the outer circumferential surface (O). The fixing member (20) can cover at least a portion of an end where the winding of the laminate (10') ends. The fixing member (20) can cover a portion of the entire circumferential area of ​​the outer circumferential surface (O) of the electrode assembly (10) at an appropriate ratio. The fixing member (20) can cover approximately 90 to 95% of the entire circumferential area of ​​the outer circumferential surface (O) of the electrode assembly (10).

[0042] According to this configuration of the present invention, the unwinding of the electrode assembly (10) after winding can be effectively prevented. The fixing member (20) covers a portion of the entire circumferential area of ​​the outer surface (O) of the electrode assembly (10) at an appropriate ratio, thereby maximizing the effect of preventing the laminate (10') from unwinding and maximizing the energy density of the electrode assembly (10). When the fixing member (20) is wound more than once along the circumferential direction of the outer surface (O), the fixing member (20) may protrude outside the outer surface (O) due to tolerance, but this phenomenon can be prevented according to the present invention.

[0043] Referring back to FIG. 4, the lower end of the fixing member (20) may be positioned higher than the lower end of the separator (15). The difference in distance between the lower end of the fixing member (20) and the lower end of the separator (15) may be approximately 0.055 times or less of the height (upward and downward extension) of the separator (15). Meanwhile, the upper end of the fixing member (20) may be approximately 0.04 to 0.1 times lower than the upper end of the separator (15).

[0044] The fixing member (20) is most effectively prevented from loosening of the laminate (10') when the lower part is attached at the same height as the lower part of the separator (15) and the upper part is attached at the same height as the upper part of the separator (15), thereby maintaining the electrode assembly (10) in a nearly circular shape before and after activation of the battery (1). However, attaching the fixing member (20) as described above may have the following problems in terms of process.

[0045] The separator (15) can be wound continuously from the center of the winding to minimize the tolerance that may occur as the winding progresses, but the fixing member (20) is wound while being attached to the outer circumference (O) of the electrode assembly (10) after the winding is completed, so a tolerance due to meandering may occur. In addition, after the winding is completed, the fixing member (20) can be inspected by a vision inspector to see if it is properly attached. In this case, if the vision inspector attaches the fixing member (20) at the same height as the separator (15), it may be difficult to determine whether the thing attached to the outermost circumference (O) is the separator (15) or the fixing member (20). When the fixed member (20) is wound around approximately 90 to 95% (i.e. approximately 0.9 to 0.95 turns) of the entire area along the circumferential direction of the outer surface (O) of the laminate (10'), the tolerance due to the meandering that may occur and the minimum unit that the vision inspector can measure may be approximately 2 mm.

[0046] For economical and process reasons as described above, it is preferable that the fixing member (20) be attached at a height lower than the height of the separator (15) rather than being attached at the same height as the height of the separator (15) in the area corresponding to the separator (15). However, if the fixing member (20) is excessively lower than the height of the separator (15), the standard deviation of the cylindrical shape of the electrode assembly (10) and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter may become excessively large after activation of the battery (1).

[0047] For the above reasons, the upper part of the fixed member (20) is preferably lower by a certain height than the upper part of the separator (15), and the lower part thereof is preferably higher by a certain height than the lower part of the separator (15).

[0048] Considering the tolerance that may occur when winding the fixed member (20) and the minimum measurement unit of the vision inspection device, which is approximately 2 mm, the experiment was conducted with the distance (l1) between the upper end of the fixed member (20) and the upper end of the separator (15) set to approximately 5 mm or more, and the distance (l2) between the lower end of the fixed member (20) and the lower end of the separator (15) set to approximately 2 mm or more.

[0049] As Experimental Example 1 included in the embodiment of the present invention, when the height (l) of the separator (15) is approximately 72 mm, the height (l3) of the fixing member (20) is approximately 65 mm, the distance (l1) between the upper end of the fixing member (20) and the upper end of the separator (15) is approximately 5 mm, and the distance (l2) between the lower end of the fixing member (20) and the lower end of the separator (15) is approximately 2 mm, an experiment was conducted by measuring the cylindricality, maximum outer diameter, and minimum outer diameter before and after activation of the battery (1). As a result of 19 experiments as shown in [Table 1] below, the standard deviation of the cylindricality was approximately 0.017, and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter was approximately 0.0169.

[0050] Difference between the maximum and minimum outer diameters of the electrode assembly after the battery activation cycle (cm) of the electrode assembly after the battery activation cycle Cylindricality10.1630.12820.1480.1330.1450.12140.1550.1450.160.13460.1520.12470.1430.11680.1580.12590.1940.155100.1290.134110.1890.152120.1470.104130.1650.136140.1710.102150.1310.13160.1670.151170.1670.096180.1370.098190.1460.131Standard deviation0.0168840.017002

[0051] As comparative example 1, when the height (l) of the separator (15) is approximately 72 mm, the height (l3) of the fixing member (20) is approximately 63 mm, the distance (l1) between the upper end of the fixing member (20) and the upper end of the separator (15) is approximately 5 mm, and the distance (l2) between the lower end of the fixing member (20) and the lower end of the separator (15) is approximately 4 mm, an experiment was conducted by measuring the cylindricality, maximum outer diameter, and minimum outer diameter before and after activation of the battery (1). As a result of 19 experiments as shown in [Table 2] below, the standard deviation of the cylindricality was approximately 0.018, and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter was approximately 0.0253.

[0052] Difference between the maximum and minimum outer diameters of the electrode assembly after battery activation (cm) Cylindricality10.1770.11420.1460.12530.1720.16140.1580.10550.1920.13460.1530.15870.1460.1680.1550.09890.1220.133100.1510.131110.220.121120.2190.136130.1580.12140.1850.115150.1360.113160.1490.131170.1470.135180.1470.158190.1730.13Standard deviation0.0252740.017975

[0053] As comparative example 2, when the height (l) of the separator (15) is approximately 72 mm, the height (l3) of the fixing member (20) is approximately 57 mm, the distance (l1) between the upper end of the fixing member (20) and the upper end of the separator (15) is approximately 13 mm, and the distance (l2) between the lower end of the fixing member (20) and the lower end of the separator (15) is approximately 2 mm, an experiment was conducted by measuring the cylindricality, maximum outer diameter, and minimum outer diameter before and after activation of the battery (1). As a result of 19 experiments as shown in [Table 3] below, the standard deviation of the cylindricality was approximately 0.021, and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter was approximately 0.0254.

[0054] Difference between the maximum and minimum outer diameters of the electrode assembly after battery activation (cm) Cylindricality10.1730.08620.1660.06930.1530.11940.0990.08150.1540.09760.1640.12170.1430.10780.1560.07390.1960.097100.1690.122110.1220.101120.1140.102130.1570.106140.1330.079150.1020.14160.1110.102170.1360.129180.1440.148190.1260.099Standard deviation0.0254460.021166

[0055] Referring to the experimental results above, only in Example 1, the standard deviation of cylindricality and the standard deviation of the difference between the maximum and minimum outer diameters were 0.02 or less. In Comparative Examples 1 and 2, the standard deviation of cylindricality and / or the standard deviation of the difference between the maximum and minimum outer diameters exceeded 0.02.

[0056] Accordingly, it may be preferable that the upper end of the fixing member (20) be positioned lower than the upper end of the separator (15). In addition, it may be preferable that the distance (l1) between the upper end of the fixing member (20) and the upper end of the separator (15) is approximately 0.04 to 0.1 times the total height (l) of the separator (15). Meanwhile, it may be preferable that the lower end of the fixing member (20) be positioned at the same height as the lower end of the separator (15) or higher. In addition, it may be preferable that the difference in distance between the lower end of the fixing member (20) and the lower end of the separator (15) is approximately 0.055 times or less the total height (l) of the separator (15).

[0057] According to this configuration of the present invention, since the standard deviation of the cylindrical shape and the standard deviation of the difference between the maximum outer diameter and the minimum outer diameter are less than 0.02 after activation of the battery (1), it is possible to produce a battery (1) having a shape as close to a perfect cylinder as possible over the entire area of ​​the electrode assembly (10).

[0058] The reason why the preferred range of the distance (l1) between the upper end of the fixing member (20) and the upper end of the separator (15) and the preferred range of the distance (l2) between the lower end of the fixing member (20) and the lower end of the separator (15) may be different will be explained together with the overall structure of the battery (1) including the electrode assembly (10) according to the present invention.

[0059] FIG. 5 is a drawing showing a battery according to one embodiment of the present invention. FIG. 6 is a drawing showing a first current collector included in a battery according to one embodiment of the present invention. FIG. 7 is a drawing showing a partial cross-section of a battery according to one embodiment of the present invention. FIG. 8 is a drawing showing a second current collector included in a battery according to one embodiment of the present invention. FIG. 9 is a drawing showing a partial cross-section of a battery according to one embodiment of the present invention.

[0060] The overall electrode relationship of the battery (1) will be described with reference to FIGS. 5, 7, and 9.

[0061] The first electrode (11) may be an anode, and the second electrode (13) may be a cathode. The first electrode (11) may protrude from the upper portion of the separator (15). The second electrode (13) may protrude from the lower portion of the separator (15).

[0062] The first electrode (11) may include a first active material portion and a first non-conductive portion.

[0063] The first active material portion may be formed by coating a first electrode active material layer on at least one surface of the first electrode plate. The first active material portion may be formed along the winding direction.

[0064] The first uncoated portion may be formed by not applying the first electrode active material layer to the first electrode plate. The first uncoated portion may be formed along the winding direction. The first uncoated portion may be provided at the top of the electrode assembly (10). At least a portion of the first uncoated portion may function as a first electrode tab. At least a portion of the first uncoated portion may protrude above the separator (15).

[0065] The second electrode (13) may include a second active material portion and a second non-conductive portion.

[0066] The second active material portion may be formed by coating a second electrode active material layer on at least one surface of the second electrode plate. The second active material portion may be formed along the winding direction.

[0067] The second uncoated portion may be formed by not applying the second electrode active material layer to the second electrode plate. The second uncoated portion may be formed along the winding direction. The second uncoated portion may be provided at the top of the electrode assembly (10). At least a portion of the second uncoated portion may function as a second electrode tab. At least a portion of the second uncoated portion may protrude below the separator (15).

[0068] Referring to FIGS. 6 and 7, a battery (1) according to the present invention may include a first current collector (Q), a battery housing (30), a top cap (40), and a first gasket (G1).

[0069] The battery housing (30) may have an opening formed on one side. The battery housing (30) may accommodate an electrode assembly (10). The battery housing (30) may have an opening formed on one side to accommodate the electrode assembly (10). The battery housing (30) is a roughly cylindrical container with an opening formed on the top, and may be made of a conductive metal material. The battery housing (30) may have an open bottom in the height direction and a closed top. The battery housing (30) may also accommodate an electrolyte through the opening.

[0070] The first current collector (Q) may be coupled to one surface of the electrode assembly (10). The first current collector (Q) may be coupled to one surface of the electrode assembly (10) on the open side of the battery housing (30). The first current collector (Q) may have a first coupling portion (Q1) coupled to the electrode assembly (10).

[0071] The top cap (40) may be configured to cover an opening formed on one side of the battery housing (30). The top cap (40) may be configured to be electrically insulated from the electrode assembly (10) and the battery housing (30) and not have polarity.

[0072] The top cap (40) may be provided with a venting portion (41) configured to be ruptured when the internal pressure of the battery (1) increases. The venting portion (41) may be configured to be more fragile compared to the surrounding area. The venting portion (41) may have a thinner thickness compared to the remaining area of ​​the top cap (40).

[0073] A first gasket (G1) may be interposed between the top cap (40) and the battery housing (30). The first gasket (G1) may be deformed together with the battery housing (30) during crimping, thereby being in close contact with the inner surface of the battery housing (30) and the top cap (40). The first gasket (G1) may include a resin material having insulating and elastic properties.

[0074] The terminal (T1) can be electrically connected to the second electrode (13). The terminal (T1) can be electrically connected to the second electrode (13) by penetrating the closed portion of the battery housing (30) provided on the opposite side of the open portion of the battery housing (30) (20). The terminal (T1) can penetrate approximately the center of the lower surface of the battery housing (30). The terminal (T1) can be electrically connected to the electrode assembly (10) by being coupled with the second current collector (P). In this case, the battery housing (30) can be used as an external terminal of an electrode other than the terminal (T1).

[0075] The second current collector (P) may be electrically connected to the second electrode (13). The second current collector (P) may have a second coupling portion (P1) that is coupled to the terminal (T1). The second current collector (P) may be electrically connected to the terminal (T1).

[0076] A second gasket (G2) may be interposed between the terminal (T1) and the battery housing (30). The second gasket (G2) may be deformed together with the terminal (T1) during riveting and may be in close contact with the inner surface of the closed portion of the battery housing (30). The second gasket (G2) may include a resin material having insulating and elastic properties.

[0077] An insulator (IS) may be positioned on the electrode assembly (10) to insulate between the battery housing (30) and the second electrode (13). The insulator (IS) may be interposed between the battery housing (30) and the electrode assembly (10) or between the battery housing (30) and the second current collector (P). The insulator (IS) may have a substantially flat plate shape or a substantially cup shape further comprising a side cover portion extending from the edge of the plate-type insulator. When the insulator (IS) has a substantially cup shape, insulation between the side of the electrode assembly (10) and the side wall of the battery housing (30) and / or insulation between the second current collector (P) and the side wall of the battery housing (30) may be possible by the side cover portion of the insulator (IS). The insulator (IS) may include a resin material having insulating properties. The insulator (IS) may have a hole approximately in the center so that the terminal (T1) can be electrically connected to the electrode assembly (10). The hole of the insulator (IS) may be larger than the maximum width of the terminal (T1) and second gasket (G2) assembly inside the battery (1).

[0078] Meanwhile, referring to FIG. 10, the battery (1) of the present invention may include an insulating member (50) to improve insulation performance. The insulating member (50) may be a tape. The insulating member (50) may prevent electrical connection between the second current collector (P) and the side wall of the battery housing (30) and / or electrical connection between the side wall of the electrode assembly (10) and the battery housing (30), especially when the insulator (IS) is not configured to cover the side of the second current collector (P) and / or the electrode assembly (10). That is, the insulating member (50) may be configured to cover the periphery of the outer circumference of the second current collector (P) and / or the periphery of an upper region of the outer circumference of the electrode assembly (10). When the second current collector (P) is placed on one side of the electrode assembly (10), the insulating member (50) can be configured to cover the perimeter of the upper region of the outer surface of the electrode assembly (10) and the perimeter of the edge of the upper surface of the second current collector (P).

[0079] In order to attach the insulating member (50), the distance between the upper end of the fixing member (20) and the upper end of the separator (15) may be greater than the distance between the lower end of the fixing member (20) and the lower end of the separator (15). When attempting to attach the insulating member (50) on the fixing member (20), the adhesive strength may be weak. This weakening of the adhesive strength may be due to the material properties of the fixing member (20) and the insulating member (50). The fixing member (20) may include, for example, polypropylene. The insulating member (50) may be, for example, polyimide.

[0080] In the manufacturing process of the battery (1), the fixing member (20) may be first attached to the periphery of the electrode assembly (10) and then the insulating member (50) may be attached. Therefore, in order to prevent attachment failure due to weakened adhesive strength as described above, it is necessary to position the separator (15) at the position where the insulating member (50) is to be attached. In consideration of this, it may be preferable that the upper end of the fixing member (20) of the present invention be positioned lower than the upper end of the separator (15).

[0081]

[0082] In the overall battery (1) structure as described above, the gas generated inside the battery (1) can be ejected in the direction where the second electrode (13), which is the negative electrode, is located. Depending on the flow of gas, the electrode assembly (10) inside the battery (1) can be influenced by the gas relatively more at the lower portion. Therefore, the attachment position of the fixing member (20) may be such that the distance between the upper end of the fixing member (20) at the upper portion and the upper end of the separator (15) may be greater than the distance between the lower end of the fixing member (20) at the lower portion and the lower end of the separator (15). In other words, it is preferable to fix the lower portion of the electrode assembly (10), which is more influenced by the gas than the upper portion, over a wider area with the fixing member (20).

[0083] Fig. 11 is a drawing showing a battery pack (3) according to one embodiment of the present invention.

[0084] Referring to FIG. 11, a battery pack (3) according to the present invention may include a battery (1). The battery pack (3) may further include various components other than the battery (1), such as components of the battery pack (3) known at the time of filing of the present invention, such as a BMS, a bus bar, a pack case, a relay, a current sensor, etc.

[0085] Fig. 12 is a drawing showing an automobile (5) according to the present invention.

[0086] Referring to Fig. 12, a vehicle (5) according to the present invention may include a battery pack (3). The vehicle (5) may be a hybrid vehicle (5) or an electric vehicle (5). In addition to the battery pack (3), the vehicle (5) according to the present invention may further include various other components included in the vehicle (5). For example, in addition to the battery pack (3) according to the present invention, the vehicle (5) according to the present invention may further include a body, a motor, a control device such as an ECU (electronic control unit), etc.

[0087] As described above, the present invention has been described with reference to the attached drawings, focusing on preferred embodiments. However, it will be apparent to those skilled in the art that numerous obvious modifications can be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be construed as encompassing such numerous modifications by the appended claims.

[0088] [Explanation of symbols]

[0089] 1 battery

[0090] 3 battery packs

[0091] 5 cars

[0092] 10 electrode assembly

[0093] 11 First electrode

[0094] 13 Second electrode

[0095] 15 membranes

[0096] 10' laminate

[0097] H winding center hole

[0098] O Outer side

[0099] 20 fixed members

[0100] 30 Battery Housing

[0101] 40 top cap

[0102] 41 Venting Department

[0103] G1 No. 1 gasket

[0104] G2 2nd gasket

[0105] T1 terminal

[0106] IS insulator

[0107] Q First House

[0108] Q1 First joint

[0109] P 2nd House

[0110] P1 Second joint

[0111] 50: Insulating member

Claims

1. A laminate including a first electrode, a second electrode, and a separator interposed therebetween is wound around a winding axis to form a winding center hole and an outer peripheral surface, An electrode assembly comprising a fixing member covering at least a portion of the outer surface along the circumferential direction of the outer surface.

2. In paragraph 1, The above fixed member is, An electrode assembly characterized in that it covers at least a portion of an area corresponding to the separator on the outer surface.

3. In paragraph 1, The above fixed member is, An electrode assembly characterized in that it covers at least a portion of an end portion where the winding of the laminate ends.

4. In paragraph 1, An electrode assembly characterized in that the lower end of the fixing member is positioned at the same height as or higher than the lower end of the separator, and the distance between the lower end of the fixing member and the lower end of the separator is 0.055 times or less the height of the separator.

5. In paragraph 1, An electrode assembly, characterized in that the upper end of the fixed member is 0.04 to 0.1 times lower than the upper end of the separator as much as the height of the separator.

6. In paragraph 1, The above first electrode protrudes from the upper portion of the separator, An electrode assembly, characterized in that the second electrode protrudes from the lower portion of the separator.

7. In paragraph 1, The above first electrode is an anode, An electrode assembly, characterized in that the second electrode is a cathode.

8. A battery comprising an electrode assembly according to any one of claims 1 to 7.

9. A battery pack comprising a battery according to Article 8.

10. A vehicle comprising a battery pack according to Article 9.

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