Battery cell

Abstract

A battery cell according to the present invention comprises a core material that provides electrical energy; and a cell housing that accommodates the core material; wherein the cell housing comprises a side cover that is open in the vertical direction and surrounds the housing axis; an upper cover that shields the upper opening of the side housing; a lower cover that shields the lower opening of the side housing; and a side vent groove formed in the side cover.

Description

Technology Field

[0001] The present invention relates to an exhaust gas discharge structure of a battery cell. Background Technology

[0002] In general, the demand for secondary batteries is rapidly increasing due to technological development and growing demand for mobile devices. Among these, lithium (ion / polymer) secondary batteries, which feature high energy density and operating voltage as well as excellent storage and lifespan characteristics, are widely used as energy sources for various electronic products as well as mobile devices.

[0003] Conventional technology discloses a pouch-type secondary battery with improved safety, wherein a channel is formed in the interior of the cell and the sealing portion of the electrode tab. When the pressure increases due to excessive gas generation inside the pouch caused by overcharging or internal short circuits, the gas can be discharged to the outside of the pouch through the channel. That is, when the gas inside the cell is discharged to the outside, it is always discharged through the sealing portion of the electrode tab, so the direction of gas discharge can be predicted in advance.

[0004] However, in the case of the prior art, channels are formed on the upper and lower surfaces of the pouch, electrodes are placed on the upper and lower surfaces of the pouch, and the upper and lower surfaces of the pouch and the outer lead frame are welded together with a resistance welder for connection.

[0005] There is a problem in which the battery cells are damaged because the channels open or break during the welding process in which channels are formed on the upper and lower surfaces of the pouch.

[0006] In addition, if a channel is formed on the upper or lower surface of the pouch, there is a problem where the battery cell is ejected to the outside of the battery pack when exhaust gas inside the battery cell is discharged. Prior art literature

[0008] Patent Publication No. 2014-0130859 The problem to be solved

[0009] The first objective of the present invention is to provide a battery cell in which an exhaust gas discharge structure is disposed on the side of the battery cell so that the battery cell is not ejected from the battery pack even when exhaust gas is discharged.

[0010] The second objective of the present invention is to provide a battery cell in which an exhaust gas discharge structure is disposed on the side of the battery cell, and no discharge structure is disposed on the side of the battery cell, thereby providing a battery cell in which the possibility of damage to the discharge structure during welding for electrode connection is low.

[0011] The third objective of the present invention is to provide a battery cell in which the exhaust gas discharge structure does not detach from the battery cell when exhaust gas is discharged from the battery cell.

[0012] The fourth objective of the present invention is to provide a battery cell that, when exhaust gas is emitted from a battery cell, adjusts the direction of exhaust gas emission so that the battery cell is not emitted and reduces the danger to the surroundings. means of solving the problem

[0013] To solve the above problems, the present invention provides an exhaust gas discharge structure positioned on the side of a battery cell.

[0014] In addition, the present invention features a V-groove on the side of the battery cell to discharge exhaust gas at an angle between the downward and sideways direction.

[0015] Specifically, the present invention comprises a core material that provides electrical energy; and a cell housing that accommodates the core material; wherein the cell housing comprises: a side cover that is open in the vertical direction and surrounds the housing axis; an upper cover that shields the upper opening of the side housing; a lower cover that shields the lower opening of the side housing; and a side vent groove formed in the side cover.

[0016] The above-mentioned side vent groove may be positioned offset from the side cover toward the lower cover.

[0017] The gap between the side vent groove and the lower cover may be 0.5mm to 2mm.

[0018] The above-mentioned side vent groove may have a thickness smaller than the above-mentioned side cover.

[0019] The above-mentioned side vent groove may include the same material as the above-mentioned side cover.

[0020] The above-mentioned side vent groove may extend in a direction parallel to the above-mentioned lower cover.

[0021] The above-mentioned side vent groove can define a closed curve that wraps around the housing axis.

[0022] The above side vent groove may include a first side vent groove extending in a direction parallel to the lower cover, and a second side vent groove extending in a direction parallel to the lower cover and spaced upward from the first side vent groove.

[0023] The first side vent groove and the second side vent groove can define a closed curve that wraps around the housing axis.

[0024] The above-mentioned side vent groove may include a first open vent groove extending in a first direction and a second open vent groove extending in a second direction and connected to one end of the first open vent groove.

[0025] The angle between the first open vent groove and the second open vent groove may be an acute angle.

[0026] The depth of one end of the first open vent groove is deeper than the depth of the other end of the first open vent groove, and the depth of one end of the second open vent groove is deeper than the depth of the other end of the second open vent groove, and one end of the first open vent groove can be connected to one end of the second open vent groove.

[0027] The direction of the angle between the first open vent groove and the second open vent groove can form an angle within 45 degrees with respect to the upward direction.

[0028] The above-mentioned side vent groove further includes a third open vent groove connecting one end of the first open vent groove and one end of the second open vent groove, and the distance between the first open vent groove and the second open vent groove may increase as it moves upward.

[0029] The depth of the third open vent groove may be deeper than the first open vent groove and the second open vent groove.

[0030] The depth of the first open vent groove and the depth of the second open vent groove may become deeper as they approach the third open vent groove.

[0031] The cell housing may further include an upper surface vent groove formed in the upper cover.

[0032] The upper surface vent groove may be a line shape that wraps around the housing axis.

[0033] Additionally, the present invention comprises a core material that provides electrical energy; and a cell housing that accommodates the core material; wherein the cell housing includes a side cover that is open in the vertical direction and surrounds the housing axis; an upper cover that shields the upper opening of the side housing; a lower cover that shields the lower opening of the side housing; and a side vent groove formed in the side cover that breaks when the pressure inside the cell housing exceeds a preset pressure.

[0034] In addition, the present invention includes a vacuum cleaner comprising the battery cell. Effects of the invention

[0036] Through the above solution, the first objective of the present invention is achieved by arranging an exhaust gas discharge structure on the side of the battery cell, thereby preventing the battery cell from being ejected from the battery pack even when exhaust gas is discharged, and having the advantage of reducing the risk of damage to components surrounding the battery due to the ejection of the battery cell and reducing the risk of injury to the user.

[0037] In addition, since the present invention places an exhaust gas discharge structure on the side of the battery cell and does not place a discharge structure on the side of the battery cell, there is a low possibility of damage to the discharge structure during welding for electrode connection, and there is an advantage that welding for electrode connection is easy.

[0038] In addition, the present invention has a gas discharge structure located near the upper surface of the battery cell and the lower surface of the battery cell from the side, so that the exhaust gas is discharged in one direction and does not operate as a propulsion force of the battery cell. Furthermore, since the side of the battery cell is wider than the upper and lower surfaces of the battery cell, multiple or wide discharge structures are formed in a wide space, thereby providing the advantage of reducing the exhaust gas discharge velocity.

[0039] In addition, the present invention has the advantage that a gas exhaust structure formed on the side of a battery cell is cut from bottom to top to allow exhaust gas to be ejected, and since the upper end of the gas exhaust structure is connected to the side of the battery cell, the direction of exhaust gas discharge is controlled between the bottom and the side when exhaust gas is discharged from the battery cell, thereby ensuring that the exhaust gas discharge does not affect the propulsion force of the battery cell and reduces damage to other parts, while preventing the gas exhaust structure from detaching from the battery cell. Brief explanation of the drawing

[0041] FIG. 1 is a side elevation view showing the usage state of a vacuum cleaner according to one embodiment of the present invention. FIG. 2 is a perspective view of a vacuum cleaner (1) with the nozzle module (70) removed from FIG. 1. Figure 3 is a side elevation view of the vacuum cleaner (1) of Figure 2. FIG. 4a is an upper elevation view of the vacuum cleaner (1) of FIG. 2. FIG. 4b is an upper elevation view of a vacuum cleaner (1) according to another embodiment. FIG. 5 is a cross-sectional view of the vacuum cleaner (1) of FIG. 3, cut horizontally along line S1-S1'. Fig. 6 is a cross-sectional view of the vacuum cleaner (1) of Fig. 4a cut vertically along line S2-S2'. FIG. 7a is an exploded perspective view of a battery cell according to one embodiment of the present invention. Fig. 7b is a combined perspective view of the battery cell of Fig. 7a. Figure 8 is a cross-sectional view of the battery cell of Figure 7b. Figure 9 is an operation diagram when gas is discharged from the battery cell of Figure 8. FIG. 10 is a perspective view of a battery cell according to another embodiment of the present invention. FIG. 11 is a cross-sectional view taken along line S11-S12 of FIG. 10. Figure 12 is an operation diagram when gas is discharged from the battery cell of Figure 10. FIG. 13 is a perspective view of a battery cell according to another embodiment of the present invention. FIG. 14 is a cross-sectional view taken along line S21-S22 of FIG. 13. Figure 15 is an operation diagram when gas is discharged from the battery cell of Figure 13. Specific details for implementing the invention

[0042] To explain the present invention, the following description is based on a spatial orthogonal coordinate system formed by mutually orthogonal X-axis, Y-axis, and Z-axis. Each axis direction (X-axis direction, Y-axis direction, Z-axis direction) refers to the two directions in which each axis extends. An axis direction preceded by a '+' sign (+X-axis direction, +Y-axis direction, +Z-axis direction) refers to a positive direction, which is one of the two directions in which each axis extends. An axis direction preceded by a '-' sign (-X-axis direction, -Y-axis direction, -Z-axis direction) refers to a negative direction, which is the other of the two directions in which each axis extends.

[0043] Expressions referring to directions such as “forward (+Y) / backward (-Y) / left (+X) / right (-X) / up (+Z) / down (-Z)” mentioned below are defined according to the XYZ coordinate axes, but this is merely for the purpose of explaining so that the present invention can be clearly understood, and it goes without saying that each direction may be defined differently depending on where the reference is placed.

[0044] The use of terms such as 'first, second, third,' etc., attached to the components mentioned below is intended solely to avoid confusion regarding the components being referred to, and is unrelated to the order, importance, or master-subordinate relationship among the components. For example, an invention including only the second component without the first component can be implemented.

[0045] As used in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0046] The vacuum cleaner according to the present invention may be a manual vacuum cleaner or a robot vacuum cleaner. Hereinafter, the vacuum cleaner (1) according to the present embodiment is described as being limited to a handheld manual vacuum cleaner, but the vacuum cleaner according to the present invention is not limited thereto.

[0047] <Vacuum cleaner including battery>

[0048] Referring to FIGS. 1 to 6, a vacuum cleaner (1) according to one embodiment includes a main body (10) that forms a path (P) for guiding sucked air to be discharged to the outside. The vacuum cleaner (1) includes a dust separation unit (20) disposed on the path (P) to separate dust from the air. The vacuum cleaner (1) includes a handle (30) coupled to the rear side of the main body (10).

[0049] The vacuum cleaner (1) includes a battery (Bt) that supplies power and a battery housing (40) that accommodates the battery (Bt). The vacuum cleaner (1) includes a fan module (50, 50') that is positioned on a flow path (P) to move air within the flow path. In addition to the dust separation unit (20), the vacuum cleaner (1) includes filters (61, 62) that are positioned on the flow path (P) to separate dust from the air.

[0050] The vacuum cleaner (1) includes a nozzle module (70) that is detachably connected to the suction pipe (11) of the main body (10). The vacuum cleaner (1) includes an input unit (3) that allows the user to input the On / Off or suction mode of the vacuum cleaner (1), and an output unit (4) that displays various states of the vacuum cleaner (1) to the user.

[0051] The vacuum cleaner (1) includes a noise control module (80, 80', 180, 280, 380, 980) that performs at least one of a first function of reducing the magnitude of noise in a relatively low frequency range among audible frequencies and a second function of increasing the magnitude of noise in a relatively high frequency range among audible frequencies. The noise control module includes a speaker (89, 989) that outputs sound. According to an embodiment, the vacuum cleaner (1) may further include a sound transmission tube (90) that transmits the sound from the speaker (89, 989) to a sound emission port (10b, 10b').

[0052] Referring to FIG. 1, the nozzle module (70) includes a nozzle part (71) configured to suck in external air and an extension tube (73) extending from the nozzle part (71). The extension tube (73) connects the nozzle part (71) and the suction tube (11). The extension tube (73) guides the air sucked in from the nozzle part (71) to flow into the suction passage (P1). One end of the extension tube (73) can be detachably connected to the suction tube (11) of the main body (10). The user can clean by holding the handle (30) while the nozzle part (71) is placed on the floor and moving the nozzle part (71).

[0053] Referring to FIGS. 2 to 7, the main body (10) forms the exterior of the vacuum cleaner (1). The main body (10) may be formed as a vertically elongated cylindrical shape overall. A dust separation unit (20) is accommodated inside the main body (10). A fan module (50, 50') is accommodated inside the main body (10). A handle (30) is attached to the rear side of the main body (10). A battery housing (40) is attached to the rear side of the main body (10).

[0054] The main body (10) includes an intake pipe (11) that guides the intake of air into the main body (10). The intake pipe (11) forms an intake passage (P1). The intake pipe (11) may protrude forward from the main body (10).

[0055] The main body (10) includes an exhaust cover (12, 12') that forms an exhaust port (10a, 10a'). The exhaust cover (12, 12') may further form a sound emission port (10b, 10b'). The exhaust cover (12, 12') may form an upper surface of the main body (10). The exhaust cover (12, 12') covers the upper part of the fan module housing (14).

[0056] The main body (10) includes a dust collection unit (13) for storing dust separated from the dust separation unit (20). At least a portion of the dust separation unit (20) may be disposed within the dust collection unit (13). The inner surface of the upper portion of the dust collection unit (13) may perform the function of the first cyclone unit (21) to be described later. (In this case, the upper portion of the dust collection unit (13) may be referred to as the first cyclone unit (21).) A second cyclone unit (22) and a dust flow guide (24) are disposed within the dust collection unit (13).

[0057] The dust collection unit (13) may be formed in a cylindrical shape. The dust collection unit (13) is positioned on the lower side of the fan module housing (14). Dust storage spaces (S1, S2) are formed inside the dust collection unit (13). A first storage space (S1) is formed between the dust collection unit (13) and the dust flow guide (24). A second storage space (S2) is formed inside the dust flow guide (24).

[0058] The main body (10) includes a fan module housing (14) that accommodates a fan module (50, 50') inside. The fan module housing (14) may be formed by extending upward from the dust collection section (13). The fan module housing (14) is formed in a cylindrical shape. An extension (31) of the handle (30) is positioned at the rear of the fan module housing (14).

[0059] The main body (10) includes a dust cover (15) provided to open and close the dust collection unit (13). The dust cover (15) may be rotatably coupled to the lower side of the dust collection unit (13). The dust cover (15) may open and close the lower side of the dust collection unit (13) by rotational movement. The dust cover (15) may include a hinge (not shown) for rotation. The hinge may be coupled to the dust collection unit (13). The dust cover (15) may open and close the first storage space (S1) and the second storage space (S2) together.

[0060] The main body (10) includes an air guide (16) that guides air discharged from the dust separation unit (20). The air guide (16) forms a fan module flow path (P4, P4') that guides air from the dust separation unit (20) to the impeller (51, 51'). The air guide (16) includes an exhaust flow path (P5, P5') that guides air passing through the impeller (51, 51') to the exhaust port (10a, 10a'). The air guide (16) may be placed within the fan module housing (14).

[0061] For example, with reference to FIGS. 6 to 6c, the air guide (16) can form a flow path (P4, P5) so that air discharged from the dust separation unit (20) rises, passes through the impeller (51) and descends, and then rises again to the exhaust port (10a, 10a').

[0062] As another example, with reference to FIG. 7, the air guide (16) can form a flow path (P4', P5') so that air discharged from the dust separation unit (20) passes through the impeller (51) and continues to rise to the exhaust port (10a, 10a').

[0063] Referring to FIGS. 2, FIGS. 4a, FIGS. 4b, and FIGS. 6 to 6c, the main body (10) forms an exhaust port (10a, 10a') through which air within the flow path (P) is discharged to the outside of the main body (10). The exhaust port (10a, 10a') may be formed in the exhaust cover (12, 12').

[0064] The exhaust port (10a, 10a') may be positioned on one side of the main body (10). The exhaust port (10a, 10a') may be formed on the upper side of the main body (10). Through this, dust around the vacuum cleaner is prevented from scattering due to the air discharged from the exhaust port (10a, 10a'), and at the same time, the phenomenon of the air discharged from the exhaust port (10a, 10a') hitting the user directly is prevented. In addition, the sound emission port may be positioned on the same side of the main body (10) as the side where the exhaust port (10a, 10a') is formed.

[0065] The exhaust port (10a, 10a') may be positioned to face a specific direction (e.g., upward direction). The direction of discharge (Ae) of the air discharged through the exhaust port (10a, 10a') may be a specific direction.

[0066] In this description, a predetermined axis (O) refers to a virtual axis extending in a specific direction across the center of the main body (10). The 'centrifugal direction' refers to a direction away from the axis (O), and the 'counter-centrifugal direction' refers to a direction approaching the axis (O). Additionally, the 'circumferential direction' refers to a direction around the axis (O) (or a direction of rotation). The circumferential direction encompasses both clockwise and counterclockwise directions.

[0067] The direction of air discharge (Ae) may be a direction between a specific direction and a centrifugal direction. The direction of air discharge (Ae) may be a direction between a specific direction and a circumferential direction. Specifically, the direction of air discharge (Ae) may be a direction between a specific direction and a counterclockwise direction. The direction of air discharge (Ae) may also be a direction in which the specific direction, the centrifugal direction, and the circumferential direction are three-dimensionally combined.

[0068] The exhaust ports (10a, 10a') may be arranged to surround the axis (O). The exhaust ports (10a, 10a') may be arranged or extended along the circumferential direction. The exhaust ports (10a, 10a') may be arranged in a predetermined peripheral area (B1, B1') that extends beyond a central angle of 180 degrees along the circumferential direction around a predetermined axis (O).

[0069] For example, referring to FIG. 4a, the surrounding area (B1) extends along the circumferential direction with a central angle of 360 degrees around the axis (O). That is, the surrounding area (B1) completely encloses the circumference of the axis (O).

[0070] As another example, referring to FIG. 4b, the peripheral region (B1') is extended along the circumferential direction around the axis (O) by a central angle Ag1. Here, the central angle (Ag1) can be a value greater than 270 degrees and less than 360 degrees. In FIG. 4a, the central angle (Ag1) is approximately 270 degrees.

[0071] Meanwhile, referring to FIG. 4b, it is preferable that the direction in which the surrounding area (B1') is not surrounded by the axis (O) is the direction in which the handle (30) is positioned (rear). In order to prevent air discharged from the exhaust port (10a') from flowing toward the user, the exhaust port (10a') may not be formed in the area between the axis (O) and the handle (30). A barrier (12b') to block air discharge may be provided in the area between the axis (O) and the handle (30). Through this, the air discharged from the exhaust port (10a') can be prevented from directly hitting the user holding the handle (30).

[0072] The exhaust port (10a, 10a') may be i extended along the circumferential direction in the surrounding area (B1, B1') or ii divided into multiple parts and arranged along the circumferential direction.

[0073] For example, with reference to FIG. 4a, a plurality of exhaust ports (10a) are arranged along a surrounding area (B1). The plurality of exhaust ports (10a) are divided from one another in the circumferential direction by a plurality of exhaust guides (12a). The plurality of exhaust ports (10a) may be arranged at a certain distance from one another along the circumferential direction.

[0074] As another example, referring to FIG. 4b, the exhaust port (10a') extends along the peripheral area (B1'). Multiple exhaust ports (10a') may be spaced apart from each other along the centrifugal direction. Multiple exhaust ports (10a') are separated from each other in the centrifugal direction by an exhaust guide (12a'). Each exhaust port (10a') may extend circumferentially by a central angle (Ag1) around the axis (O).

[0075] The main body (10) includes exhaust guides (12a, 12a') configured so that air discharged through exhaust ports (10a, 10a') is discharged in a direction inclined with respect to the axis (O). The exhaust guides (12a, 12a') may be arranged inclined with respect to the axis (O). The exhaust cover (12, 12') may include exhaust guides (12a, 12a') that divide the exhaust ports (10a, 10a') into multiple parts.

[0076] For example, with reference to FIG. 4a, the exhaust cover (12) includes a plurality of exhaust guides (12a) that divide the exhaust port (10a) into multiple parts. The plurality of exhaust guides (12a) are spaced apart along the circumferential direction. Each exhaust guide (12a) extends in a direction between the circumferential direction and the centrifugal direction and divides two adjacent exhaust ports (10a). The spaced-apart space between two adjacent exhaust guides (12a) becomes the exhaust port (10a). The exhaust guides (12a) induce air to be discharged in a direction in which the specific direction, the centrifugal direction, and the circumferential direction are combined in three dimensions.

[0077] As another example, referring to FIG. 4b, the exhaust cover (12') includes a single exhaust guide (12a') that divides the exhaust port (10a') into two. The exhaust guide (12a') extends along the circumferential direction. The exhaust guide (12a') extends circumferentially from one end of the barrier (12b') to the other end by a central angle (Ag1) around the axis (O). The exhaust guide (12a') guides the air to be discharged in a direction that combines a specific direction and a centrifugal direction.

[0078] Referring to FIGS. 2, FIGS. 4a, FIGS. 4b, and FIGS. 6 to 6c, the main body (10) forms a sound emission port (10b, 10b') through which sound from a speaker (89, 989) is emitted. The sound emission port (10b, 10b') may be formed in an exhaust cover (12, 12').

[0079] A sound emission port (10b, 10b') may be formed on the upper side of the main body (10). The sound emission port (10b, 10b') may be positioned to face a specific direction (e.g., upward direction). The direction of sound emission (Se) emitted through the sound emission port (10b, 10b') becomes a specific direction.

[0080] It is preferable that the sound emission port (10b, 10b') be provided separately from the exhaust port (10a, 10a'). This prevents air or dust moving within the path (P) from affecting the performance of the speaker (89, 989).

[0081] It is preferable that the exhaust port (10a, 10a') and the sound emission port (10b, 10b') face the same direction relative to the main body (10). By doing so, when the noise emitted through the exhaust port (10a, 10a') and the sound emitted through the sound emission port (10b, 10b') are combined and reach the user's ear, the phenomenon in which the ratio of the noise level to the sound level varies depending on the position of the user's ear can be reduced, and the sound can be combined with the noise according to a preset ratio.

[0082] The sound emission port (10b, 10b') may be positioned in the center of the exhaust cover (12, 12'). The sound emission port (10b, 10b') may be positioned in the opposite centrifugal direction of the surrounding area (B1, B1') with respect to the axis (O). The sound emission port (10b, 10b') may be positioned in the central part through which the axis (O) passes. The sound emission port (10b, 10b') may be positioned within a predetermined central area (B2) through which the axis (O) passes, which is spaced apart from the surrounding area (B1, B1') in the opposite centrifugal direction. Through this, a sound generation area can be formed by the central sound emission port (10b, 10b') of the noise generation area by the exhaust port (10a, 10a'), and the noise by the exhaust port (10a, 10a') and the sound by the speaker (89, 989) can be destructive or constructive interference as preset. This is particularly effective in canceling out (destructive interference) the low-frequency range of the generated noise with the sound of the speaker (89, 989) with a 180-degree phase change.

[0083] For example, with reference to FIG. 2, the sound emitter (10b) may include a plurality of holes formed spaced apart from each other within a central region (B2).

[0084] As another example, with reference to FIG. 4b, a mesh-shaped structure is placed within the central area (B2), and a large number of holes formed by the mesh-shaped structure can function as sound emitting ports (10b).

[0085] As another example, referring to FIG. 4b, the sound emitter (10b') may include a gap that extends circumferentially around the axis (O) within the central region (B2). Specifically, the sound emitter (10b') may include a ring-shaped gap.

[0086] Referring to FIGS. 5 to 6c, the dust separation unit (20) performs the function of filtering dust on the flow path (P). The dust separation unit (20) separates dust sucked into the main body (10) through the suction pipe (11) from the air.

[0087] For example, the dust separation unit (20) may include a first cyclone unit (21) and a second cyclone unit (22) capable of separating dust by cyclone flow. The flow path (P2) formed by the first cyclone unit (21) may be connected to the suction flow path (P1) formed by the suction pipe (11). Air and dust sucked in through the suction pipe (11) flow spirally along the inner surface of the first cyclone unit (21).

[0088] The axis (A2) of the cyclone flow of the first cyclone section (21) may be extended in the vertical direction. The axis (A2) of the cyclone flow may coincide with the axis (O). The second cyclone section (22) additionally separates dust from the air that has passed through the first cyclone section (21). The second cyclone section (22) may be located inside the first cyclone section (21). The second cyclone section (22) may be located inside the boundary section (23). The second cyclone section (22) may include a plurality of cyclone bodies arranged in parallel.

[0089] As another example, the dust separation unit (20) may have a single cyclone unit. In this case as well, the axis (A2) of the cyclone flow may be extended in the vertical direction.

[0090] As another example, the dust separation unit (20) may include a main filter unit (not shown) instead of a cyclone unit. The main filter unit can separate dust from the air entering from the suction pipe (11).

[0091] Hereinafter, the dust separation unit (20) is described based on the present embodiment including the first cyclone unit (110) and the second cyclone unit (130), but is not necessarily limited thereto.

[0092] The dust separation unit (20) forms dust separation channels (P2, P3). Air moves rapidly through the dust separation channels (P2, P3), and dust in the air is separated, and the separated dust is stored in the first storage space (S1).

[0093] The space between the inner surface of the first cyclone section (21) and the outer surface of the boundary section (23) becomes the flow path (P2) of the first cyclone. Air passing through the intake flow path (P1) moves in a downward spiral direction in the flow path (P2) of the first cyclone, and dust in the air is centrifugally separated. Here, the axis (A2) becomes the axis (A2) of the flow in the downward spiral direction.

[0094] The dust separation unit (20) includes a boundary unit (23) arranged cylindrically inside the first cyclone unit (21). The boundary unit (23) forms a plurality of holes on its outer surface. Air within the first cyclone flow path (P2) can pass through the plurality of holes of the boundary unit (23) and flow into the second cyclone flow path (P3). Large volume dust can also be filtered by the plurality of holes of the boundary unit (23).

[0095] The upper portion of the second cyclone section (22) is positioned inside the boundary section (23). The second cyclone section (22) includes a plurality of cyclone bodies that are hollow inside and penetrate vertically. Each cyclone body may be formed in a pipe shape that tapers toward the lower side. A second cyclone flow path (P3) is formed inside each cyclone body. Air passing through the boundary section (23) moves to the second cyclone flow path (P3) along a guide that guides the airflow in a downward spiral direction, which is positioned on the upper portion of the cyclone body. The air moves downward spirally along the inner surface of the cyclone body, and dust in the air is centrifugally separated, and the separated air is stored in the second storage space (S2). Air that has moved along the second cyclone flow path (P3) to the lower portion of the cyclone body moves upward along the vertical central axis of the second cyclone flow path (P3) and flows into the fan module flow path (P4, P4').

[0096] The dust separation unit (20) includes a dust flow guide (24) that separates a first storage space (S1) and a second storage space (S2) within the dust collection unit (13). The space between the dust flow guide (24) and the inner surface of the dust collection unit (13) is the first storage space (S1). The space inside the dust flow guide (24) is the second storage space (S2).

[0097] The dust flow guide (24) is coupled to the lower side of the second cyclone section (22). The dust flow guide (24) contacts the upper surface of the dust cover (15). A portion of the dust flow guide (24) may be formed such that its diameter decreases from the upper side to the lower side. For example, the upper part of the dust flow guide (24) may be formed such that its diameter decreases as it goes downward, and the lower part of the dust flow guide (24) may be formed as a cylindrical shape extending vertically.

[0098] The dust separation section (20) may include a scattering prevention rib (25) extending downward from the upper part of the dust flow guide (24). It may wrap around the perimeter of the upper part of the dust flow guide (24). The scattering prevention rib (25) may extend along a circumferential direction centered on the axis of flow (A2). For example, the scattering prevention rib (25) may be formed in a cylindrical shape.

[0099] When the upper portion of the dust flow guide (24) is formed such that its diameter decreases as it extends downward, a space is formed between the outer surface of the upper portion of the dust flow guide (24) and the scattering prevention rib (25). When an upward flow of air occurs along the dust flow guide (24) within the first storage space (S1), the rising dust is caught by the space between the scattering prevention rib (25) and the upper portion of the dust flow guide (24). Through this, it is possible to prevent the dust within the first storage space (S1) from flowing upward.

[0100] The handle (30) is coupled to the main body (10). The handle (30) can be coupled to the rear side of the main body (10). The handle (30) can be coupled to the upper side of the battery housing (40).

[0101] The handle (30) includes an extension (31) that protrudes and extends from the main body (10) to the rear. The extension (31) may extend forward from the upper part of an additional extension (32). The extension (31) may extend in a horizontal direction. In Embodiment B to be described later, a speaker (989) is placed inside the extension (31).

[0102] The handle (30) extends in the vertical direction and includes an additional extension (32). The additional extension (32) may be spaced apart from the main body (10) in the front-rear direction. The user can hold the additional extension (32) and use the vacuum cleaner (1). The upper end of the additional extension (32) is connected to the rear end of the extension (31). The lower end of the additional extension (32) is connected to the battery housing (40).

[0103] The additional extension part (32) may be provided with a movement limiting part (32a) to prevent the hand from moving in the longitudinal direction (up and down direction) of the additional extension part (32) while the user is holding the additional extension part (32). The movement limiting part (32a) may protrude forward from the additional extension part (32).

[0104] The movement limiting part (32a) is positioned vertically spaced apart from the extension part (31). When the user holds the additional extension part (32), some fingers of the user's hand are positioned above the movement limiting part (32a), and the remaining fingers are positioned below the movement limiting part (32a).

[0105] The handle (30) may include an inclined surface (33) facing the direction between the upper and rear sides. The inclined surface (33) may be positioned on the rear side of the extension (31). An input part (3) may be placed on the inclined surface (33).

[0106] The battery (Bt) can supply power to the fan module (50, 50'). The battery (Bt) can supply power to the noise control module. The battery (Bt) can be detachably placed inside the battery housing (40).

[0107] The battery housing (40) is coupled to the rear side of the main body (10). The battery housing (40) is positioned on the lower side of the handle (30). A battery (Bt) is accommodated inside the battery housing (40). A heat dissipation hole may be formed in the battery housing (40) to discharge heat generated from the battery (Bt) to the outside.

[0109] Referring to FIG. 6, the fan module (50, 50') generates suction force to allow external air to flow into the air passage (P). The fan module (50, 50') is placed within the main body (10). The fan module (50, 50') is placed below the sound outlet (10b, 10b'). The fan module (50, 50') is placed above the dust separation unit (20).

[0110] The fan module (50, 50') includes an impeller (51, 51') that generates suction force by rotation. The impeller (51, 51') pressurizes the air so that the air in the flow path (P) is discharged through the exhaust port (10a, 10a'). When the impeller (51, 51') pressurizes the air, noise and vibration are generated, and this noise is mainly discharged through the exhaust port (10a, 10a').

[0111] The extension of the rotation axis (A1) (which can also be called the axis of the suction motor) of the impeller (51, 51') may coincide with the axis of flow (A2).

[0112] Additionally, the rotation axis (A1) may coincide with the axis (O). In this case, the impeller (51, 51') rotates around the axis (O) to pressurize the air. Through this, noise can be emitted relatively evenly through the exhaust ports (10a, 10a') formed in the surrounding area (B1, B1').

[0113] The fan module (50, 50') includes a suction motor (52, 52') that rotates the impeller (51). The suction motor (52, 52') may be the only motor of the vacuum cleaner (1). The suction motor (52, 52') may be located above the dust separator (20). When the suction motor (52, 52') is in operation, noise and vibration are generated, and this noise is mainly emitted through the exhaust port (10a, 10a').

[0114] For example, with reference to FIG. 6, a fan module (50) may be provided with an impeller (51) positioned below a suction motor (52). When the impeller (51) rotates, it pressurizes the air in an upward direction.

[0115] As another example, with reference to FIG. 7, a fan module (50') may be provided with an impeller (51') positioned below a suction motor (52'). When the impeller (51') rotates, it pressurizes the air downwards.

[0116] The fan module (50, 50') may include a shaft (53) fixed to the center of the impeller (51, 51'). The shaft (53) is arranged to extend vertically on the rotation axis (A1). The shaft (53) can function as the motor shaft of the suction motor (52).

[0117] Meanwhile, the vacuum cleaner (1) may include a PCB (55) for controlling the suction motor (52, 52'). The PCB (55) may be placed between the suction motor (52) and the dust separation unit (20).

[0118] The vacuum cleaner (1) may include a pre-filter (61) that filters air before it is sucked into the suction motor (52, 52'). The pre-filter (61) may be positioned to surround the impeller (51). Air on the fan module path (P4, P4') passes through the pre-filter (61) and reaches the impeller (51). The pre-filter (61) is positioned inside the main body (10). The pre-filter (61) is positioned below the discharge cover (12, 12'). The user can remove the pre-filter (61) from inside the main body (10) by separating the discharge cover (12, 12') from the vacuum cleaner (1).

[0119] The vacuum cleaner (1) may include a HEPA filter (62) that filters the air before it is discharged through the exhaust port (10a, 10a'). Air passing through the impeller (51, 51') can be discharged to the outside through the exhaust port (10a) after passing through the HEPA filter (62). The HEPA filter (62) is positioned on the exhaust path (P5).

[0120] The discharge cover (12, 12') may form a filter receiving space (not shown) for receiving a HEPA filter (62). The filter receiving space is formed so that the lower side is open, so that the HEPA filter (62) can be received in the filter receiving space at the lower side of the discharge cover (12, 12').

[0121] An exhaust port (10a) may be formed to face the HEPA filter (62). The HEPA filter (62) is positioned below the exhaust port (10a, 10a'). The HEPA filter (62) may be extended circumferentially along the exhaust port (10a, 10a').

[0122] The main body (10) includes a filter cover (17) that covers the lower side of the HEPA filter (62). When the HEPA filter (62) is housed in a filter receiving space, the lower side of the HEPA filter (62) is covered by the filter cover (17), and a hole is formed in the filter cover (17) for air to pass through the exhaust passage (P5). The filter cover (17) can be detachably coupled to the exhaust cover (12, 12').

[0123] The exhaust cover (12, 12') can be detachably coupled to the fan module housing (14). When the filter cover (17) is detached from the exhaust cover (12, 12') separated from the fan module housing (14), the HEPA filter (62) can be withdrawn from the filter receiving space.

[0124] In the present invention, the vacuum cleaner (1) is described as including a pre-filter (61) and a HEPA filter (62), but it goes without saying that there are no limitations on the type and number of filters.

[0125] Meanwhile, the input section (3) may be located on the opposite side of the movement limiting section (32a) relative to the handle (30). The input section (3) may be placed on the inclined surface (33).

[0126] Additionally, the output unit (4) may be positioned on the extension unit (31). For example, the output unit (4) may be located on the upper surface of the extension unit (31). The output unit (4) may include a plurality of transmitting units (111). The plurality of transmitting units (111) may be spaced apart in the longitudinal direction (front-back direction) of the extension unit (31).

[0127] Meanwhile, with reference to FIGS. 5 to 7, the Euro (P) is formed by sequentially connecting the intake Euro (P1), dust separation Euro (P2, P3), fan module Euro (P4, P4'), and exhaust Euro (P5, P5').

[0128] In particular, referring to FIG. 5, the suction channel (P1) provides external air to the dust separation unit (20). The suction channel (P1) is connected to the dust separation unit (20). Specifically, the suction channel (P1) can be defined by a suction pipe (11), and a portion of the suction channel (P1) may be exposed to the outside of the main body (10), while the other side of the suction channel (P1) may be located within the main body (10). One side of the suction channel (P1) may be connected to an extension pipe (73) connected to a nozzle unit (71). The air within the suction channel (P1) is moved by a fan module.

[0129] A flap door (44) for opening and closing the suction pipe (11) is installed in the suction pipe (11).

[0130] Air and dust sucked in through the suction path (P1) by the operation of the suction motor (52, 52') flow within the first path (P2) and the second cyclone path (P3) and are separated from each other. In the second cyclone path (P3), the air moves upward as described above and flows into the fan module path (P4, P4').

[0131] The fan module path (P4, P4') guides air toward the pre-filter (61). Air that has passed through the pre-filter (61) and the impeller (51) sequentially flows into the exhaust path (P5, P5'). After passing through the exhaust path (P5, P5'), the air is discharged to the outside through the exhaust port (10a, 10a') after passing through the HEPA filter (62).

[0132] The fan module flow path (P4) guides the air so that the air discharged from the dust separation unit (20) rises and then descends as it passes through the impeller (51). Here, the exhaust flow path (P5) guides the air so that the air descending as it passes through the impeller (51) rises again to the exhaust port (10a, 10a').

[0134] <Battery cell of the first embodiment>

[0135] Below, the battery cell (100) constituting the battery (Bt) described above will be described in detail.

[0136] Referring to FIGS. 7 and 8, the battery cell (100) of the present invention includes a core material (140) that provides electrical energy and a cell housing (110, 120, 130) that accommodates the core material (140).

[0137] The core material (140) provides electrical energy while discharging. For example, the core material (140) has a positive plate, a negative plate, and a separator, and electrode leads may be connected to electrode tabs extending from each of the positive plate and the negative plate.

[0138] The cell housing (110, 120, 130) provides a space for accommodating the core material (140) and forms power terminals connected to the positive plate and the negative plate. The cell housing (110, 120, 130) may have various shapes for accommodating the core material (140).

[0139] For example, the cell housing (110, 120, 130) may have various shapes such as a cylinder, a polygonal column, and a pouch. Specifically, the cell housing (110, 120, 130) may include a side cover (110) that is open in the vertical direction and surrounds the housing axis (G), an upper cover (120) that covers the upper opening of the side housing, and a lower cover (130) that covers the lower opening of the side housing.

[0140] The side cover (110) is cylindrical in shape centered on the housing axis (G), and has an upper opening (111) and a lower opening (112) formed therein. The side cover (110) may have a surface extending in a direction parallel to the housing axis (G).

[0141] The upper cover (120) covers the upper opening (111). The upper cover (120) may define a surface that intersects the housing axis (G). An electrode terminal (not shown) may be formed on the upper cover (120). Preferably, the electrode terminal is not formed on the upper cover (120), and an upper surface vent groove (160) may be formed.

[0142] The upper surface vent groove (160) is a structure in which a part of the upper surface cover is damaged when the pressure increases due to exhaust gas inside the cell housing (110, 120, 130). For example, the upper surface vent groove (160) may be formed by a part of the upper surface cover being sunken. As another example, the upper surface vent groove (160) may be defined as an area of ​​the upper surface cover having a thickness smaller than the thickness of the upper surface cover.

[0143] The cross-sectional shape of the upper surface vent groove (160) may be V or U-shaped. The upper surface vent groove (160) may extend in one direction in a line shape. It is preferable that the upper surface vent groove (160) be formed in a ring shape that surrounds the housing axis (G).

[0144] The lower cover (130) covers the lower opening (112). The lower cover (130) may define a surface that intersects the housing axis (G). Electrode terminals (not shown) may be formed on the lower cover (130). Preferably, a positive terminal (not shown) connected to a positive plate and a negative terminal (not shown) connected to a negative plate may be formed on the lower cover (130).

[0145] Since the lower cover (130) and the lead frame are connected to each other by welding, if a vent groove is formed in the lower cover (130), the battery cell (100) may be damaged as the vent groove is damaged during the welding process. Therefore, the present invention solves this problem by not forming a vent groove in the lower cover (130) and forming a vent groove in the side cover (110) as described below.

[0147] A side vent groove (150) is formed in the side cover (110). The side vent groove (150) may have a structure that breaks when the pressure inside the cell housing (110, 120, 130) exceeds a preset pressure. Additionally, the side vent groove (150) may have a structure that breaks and deforms when the pressure inside the cell housing (110, 120, 130) exceeds a preset pressure, thereby guiding the direction of exhaust gas discharged from inside the cell housing (110, 120, 130).

[0148] For example, the side vent groove (150) may be formed by a portion of the side cover (110) being recessed. As another example, the side vent groove (150) may be defined as an area of ​​the side cover (110) having a thickness smaller than the thickness of the side cover (110). That is, the side vent groove (150) may be defined as a portion of the side cover (110) that is thinner than the standard thickness. The side vent groove (150) has a thickness smaller than that of the side cover (110). It is easier to manufacture the side vent groove (150) if it is made of the same material as the side cover (110).

[0149] The cross-sectional shape of the side vent groove (150) may be V or U-shaped. The side vent groove (150) may extend in one direction in a line shape. Additionally, the side vent groove (150) may be in the form of multiple straight lines connected to each other or may be circular. Additionally, the side vent groove (150) may be connected continuously. Additionally, multiple side vent grooves (150) may be spaced apart from each other.

[0150] For example, the side vent groove (150) is formed in a ring shape that wraps around the housing axis (G). The side vent groove (150) defines a closed curve that wraps around the housing axis (G). Specifically, the side vent groove (150) extends along the circumference of the side cover (110). Of course, while the side vent groove (150) extends along the circumference of the side cover (110), there may be a discontinuous section in the middle. The side vent groove (150) may extend in a direction parallel to the lower cover (130).

[0151] As another example, the side vent groove (150) may include a first side vent groove (151) extending in a direction parallel to the lower cover (130), and a second side vent groove (152) extending in a direction parallel to the lower cover (130) and spaced upward from the first side vent groove (151). The first side vent groove (151) and the second side vent groove (152) may define a closed curve that encloses the housing axis (G). Of course, as another example, the side vent groove (150) may be a plurality of lines extending in a direction parallel to the lower cover (130).

[0152] When the side vent groove (150) is formed along the circumference of the side cover (110), the vent groove can be formed over a larger area compared to the lower cover (130), so the pressure of the exhaust gas discharged from the cell housing (110, 120, 130) can be reduced, and damage to parts other than the battery due to the pressure of the exhaust gas can be reduced.

[0153] The side vent groove (150) is positioned offset from the side cover (110) toward the lower cover (130). For example, it is preferable that the gap between the side vent groove (150) and the lower cover (130) is 0.5 mm to 2 mm. When the side vent groove (150) is positioned offset toward the lower cover (130), the movement of the battery cell (100) can be prevented by balancing the exhaust gas discharged from the upper vent groove (160) of the upper cover (120) and the exhaust gas discharged from the side vent groove (150).

[0154] Referring to FIG. 9, when excessive gas is generated inside the cell housing (110, 120, 130) due to causes such as overcharging or internal short circuit, and the pressure increases, the side vent groove (150) is damaged, creating a space that communicates between the outside and the inside of the cell housing (110, 120, 130). When exhaust gas inside the cell housing (110, 120, 130) is ejected through this space, the explosion of the battery cell (100) is prevented. Of course, although not shown in the drawing, the top vent groove (160) is also damaged, and gas is discharged through the damaged space.

[0156] <2nd Example>

[0157] Hereinafter, a battery cell (100A) according to the second embodiment will be described. In the following, the differences from the first embodiment (Figs. 7 and 8) will be described in detail, and identical descriptions will be omitted. Components without special description will be considered identical to the first embodiment.

[0158] Referring to FIGS. 10 and 11, the second embodiment differs from the first embodiment in the structure of the side vent groove (150A).

[0159] According to the second embodiment, the side vent groove (150A) may have a structure in which the side cover (110) around the side vent groove (150A) is deformed as the side vent groove (150A) is damaged by the internal pressure of the cell housing (110, 120, 130), thereby guiding the direction of exhaust gas discharge.

[0160] Multiple side vent grooves (150A) may be spaced apart from each other. Specifically, multiple side vent grooves (150A) may be arranged along the circumference of the side cover (110).

[0161] For example, the side vent groove (150A) includes a first open vent groove (153) extending in a first direction and a second open vent groove (154) extending in a second direction and connected to one end of the first open vent groove (153). One end of the first open vent groove (153) is connected to one end of the second open vent groove (154). The first open vent groove (153) and the second open vent groove (154) may have a straight or curved shape.

[0162] One end of the first open vent groove (153) and one end of the second open vent groove (154) are connected to each other, and the distance between the first open vent groove (153) and the second open vent groove (154) can be increased from one end of the first open vent groove (153) toward the other end. The first direction and the second direction may be directions between the upper and the lateral direction.

[0163] The angle (Ag10) between the first open vent groove (153) and the second open vent groove (154) may be an acute angle. Preferably, the angle (Ag10) between the first open vent groove (153) and the second open vent groove (154) may be 20 to 40 degrees. The first open vent groove (153) and the second open vent groove (154) have a V-shape. When the side cover (110) is cut along the first open vent groove (153) and the second open vent groove (154), a large space for discharging exhaust gas can be secured, so the pressure of the discharged exhaust gas is significantly lowered and the amount of exhaust gas that can be discharged per hour increases.

[0164] The distance between the first open vent groove (153) and the second open vent groove (154) may increase as it moves upward. If the angle (Ag10) between the first open vent groove (153) and the second open vent groove (154) is less than 20 degrees, a space for sufficient exhaust gas discharge is not secured when cut by exhaust gas, and if the angle (Ag10) between the first open vent groove (153) and the second open vent groove (154) is greater than 40 degrees, it is difficult for the side cover (110) to be cut along the first open vent groove (153) and the second open vent groove (154) by exhaust gas, and it is also difficult for the side cover (110) to be deformed.

[0165] The direction (VD) of the angle formed between the first open vent groove (153) and the second open vent groove (154) can form an angle within 45 degrees with respect to the upper direction. Preferably, the direction (VD) of the angle formed between the first open vent groove (153) and the second open vent groove (154) can be parallel to the upper direction. When the direction (VD) of the angle formed between the first open vent groove (153) and the second open vent groove (154) is parallel to the upper direction, the side cover (110) is cut along the first open vent groove (153) and the second open vent groove (154) by the exhaust gas, thereby guiding the exhaust gas in the direction between the lower and the side.

[0166] When exhaust gas is discharged between the bottom and the side, the vector sum of the exhaust gas discharged from the upper vent groove (160) becomes close to zero, so that the battery cell (100) is prevented from being discharged.

[0167] The depth (h2) of one end of the first open vent groove (153) is deeper than the depth of the other end (h1) of the first open vent groove (153), and the depth of one end (h2) of the second open vent groove (154) may be deeper than the depth of the other end (h3) of the second open vent groove (154).

[0168] As another example, the depth of the first open vent groove (153) can be increased from the other end to the first end, and the depth of the second open vent groove (154) can be increased from the other end to the first end.

[0169] If the depth of the part where the first open vent groove (153) and the second open vent groove (154) are connected is deep, damage begins to occur from one end of the first open vent groove (153) and one end of the second open vent groove (154) due to exhaust gas, and damage occurs in the direction of the other end of the first open vent groove (153) and the other end of the second open vent groove (154), and the side cover (110) between the first open vent groove (153) and the second open vent groove (154) is bent.

[0171] Referring to FIG. 12, when excessive gas is generated inside the cell housing (110, 120, 130) due to causes such as overcharging or internal short circuit, and the pressure increases, damage begins from one end of the first open vent groove (153) and one end of the second open vent groove (154), and damage occurs in the direction of the other end of the first open vent groove (153) and the other end of the second open vent groove (154), and the side cover (110) between the first open vent groove (153) and the second open vent groove (154) is bent, and the side cover (110) is opened.

[0172] When exhaust gas is ejected into the open space of the side cover (110), the direction of exhaust gas discharge is guided between the outer direction and the lower direction by the banded part of the side cover (110).

[0174] <3rd Example>

[0175] Hereinafter, a battery cell (100B) according to the third embodiment will be described. In the following, the differences from the second embodiment (Figs. 10 and 11) will be described in detail, and identical descriptions will be omitted. Configurations without special description will be considered identical to the second embodiment.

[0176] Referring to FIGS. 13 and 14, the third embodiment differs from the second embodiment in the structure of the side vent groove (150B).

[0177] According to the third embodiment, the side vent groove (150B) may have a structure in which the side cover (110) around the side vent groove (150B) is deformed as the side vent groove (150B) is damaged by the internal pressure of the cell housing (110, 120, 130), thereby guiding the direction of exhaust gas discharge.

[0178] For example, the side vent groove (150B) includes a first open vent groove (155) extending in a first direction, a second open vent groove (156) extending in a second direction and connected to one end of the first open vent groove (155), and a third open vent groove (157) connecting one end of the first open vent groove (155) and one end of the second open vent groove (156).

[0179] One end of the first open vent groove (155) and one end of the second open vent groove (156) are connected to both ends of the third open vent groove (157). The third open vent groove (157) may extend in a direction intersecting with the up and down direction. Preferably, the third open vent groove (157) may extend in a direction parallel to the lower cover (130).

[0180] The distance between the first open vent groove (155) and the second open vent groove (156) can be increased from one end of the first open vent groove (155) toward the other end (upward direction).

[0181] The angle between the first open vent groove (155) and the second open vent groove (156) may be an acute angle. Preferably, the angle between the first open vent groove (155) and the second open vent groove (156) may be 10 to 30 degrees.

[0182] Since the exhaust gas discharge space is greatly secured by the third open vent groove (157) in the beginning, there is no need for the angle between the first open vent groove (155) and the second open vent groove (156) to be large.

[0183] The direction of the angle (VD2) between the first open vent groove (155) and the second open vent groove (156) can form an angle within 45 degrees with respect to the upper direction. Preferably, the direction of the angle (VD2) between the first open vent groove (155) and the second open vent groove (156) can be parallel to the upper direction. When the direction of the angle (VD2) between the first open vent groove (155) and the second open vent groove (156) is parallel to the upper direction, the side cover (110) is cut along the first open vent groove (155) and the second open vent groove (156) by the exhaust gas, thereby guiding the exhaust gas in the direction between the lower and the side.

[0184] The depth (h6) of the third open vent groove (157) may be deeper than the depth (h4) of the first open vent groove (155) and the depth (h5) of the second open vent groove (156). The depth of the first open vent groove (155) and the depth of the second open vent groove (156) may become deeper as they approach the third open vent groove (157). The depth of the third open vent groove (157) may become deeper as it moves from both ends toward the center.

[0185] If the depth of the third open vent groove (157) is deep, damage begins from the third open vent groove (157) due to exhaust gas, and as damage progresses toward the other end of the first open vent groove (155) and the other end of the second open vent groove (156), the side cover (110) between the first open vent groove (155) and the second open vent groove (156) is bent and opened.

[0186] According to the third embodiment, a large amount of exhaust gas can be discharged initially, so the pressure of the exhaust gas can be kept very low initially.

[0187] Referring to FIG. 15, when excessive gas is generated inside the cell housing (110, 120, 130) due to causes such as overcharging or internal short circuit, and the pressure increases, damage begins from the third open vent groove (157), and as damage progresses toward the other end of the first open vent groove (155) and the other end of the second open vent groove (156), the side cover (110) between the first open vent groove (155) and the second open vent groove (156) is bent, and the side cover (110) is opened.

[0188] When exhaust gas is ejected into the open space of the side cover (110), the direction of exhaust gas discharge is guided between the outer direction and the lower direction by the banded part of the side cover (110).

[0190] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the patent claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention.

Claims

Claim 1 A core material that provides electrical energy; and a cell housing that accommodates the core material; wherein the cell housing comprises: a side cover that is open in the vertical direction and surrounds the housing axis; an upper cover that shields the upper opening of the side cover; and a lower cover that shields the lower opening of the side cover. A battery cell comprising a side vent groove formed in the side cover, wherein the side vent groove comprises a first side vent groove extending in a direction parallel to the lower cover and a second side vent groove extending in a direction parallel to the lower cover and spaced upward from the first side vent groove, wherein the first side vent groove and the second side vent groove define a closed curve surrounding the housing axis, and the side vent groove is positioned offset from the side cover toward the lower cover, and the cell housing further comprises an upper surface vent groove formed in the upper cover, wherein the upper surface vent groove guides exhaust gas upward and the side vent groove guides exhaust gas in a direction between downward and side. Claim 2 delete Claim 3 A battery cell according to claim 1, wherein the distance between the side vent groove and the lower cover is 0.5 mm to 2 mm. Claim 4 In claim 1, the side vent groove is a battery cell having a thickness smaller than the side cover. Claim 5 In claim 1, the side vent groove is a battery cell comprising the same material as the side cover. Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 delete Claim 12 delete Claim 13 delete Claim 14 delete Claim 15 delete Claim 16 delete Claim 17 delete Claim 18 In claim 1, the upper surface vent groove is a line shape that wraps around the housing axis, and the upper surface vent groove is a battery cell located closer to the housing axis than the side vent grooves. Claim 19 A core material that provides electrical energy; and a cell housing that accommodates the core material; wherein the cell housing comprises: a side cover that is open in the vertical direction and surrounds the housing axis; an upper cover that shields the upper opening of the side cover; and a lower cover that shields the lower opening of the side cover. A battery cell comprising a side vent groove formed in the side cover and which breaks when the pressure inside the cell housing exceeds a preset pressure, wherein the side vent groove comprises a first side vent groove extending in a direction parallel to the lower cover and a second side vent groove extending in a direction parallel to the lower cover and spaced upward from the first side vent groove, wherein the first side vent groove and the second side vent groove define a closed curve surrounding the housing axis, and the side vent groove is positioned offset from the side cover toward the lower cover, and the cell housing further comprises an upper surface vent groove formed in the upper cover, wherein the upper surface vent groove guides exhaust gas upward and the side vent groove guides exhaust gas in a direction between downward and side. Claim 20 A vacuum cleaner comprising a battery cell according to any one of paragraphs 1, 3 through 5, 18 and 19.

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