Battery cell comprising cover including cooling passage, and battery device comprising same

Abstract

Provided is a battery cell comprising: an electrode assembly; a case accommodating the electrode assembly; and a cover surrounding at least a part of the case and including a cooling passage. The cover comprises first surfaces including recesses and second surfaces spaced apart from the first surfaces and including protrusions. At least a part of the case is positioned between the first surfaces and the second surfaces.

Description

Battery cell including a cover including a cooling passage and a battery device including the same

[0001] The present disclosure relates to a battery cell including a cover including a cooling path and a battery device including the same.

[0002] Unlike primary batteries, secondary batteries can be recharged and discharged, making them suitable for a wide range of applications, including digital cameras, mobile phones, laptops, hybrid and electric vehicles, and energy storage systems (ESS). Secondary batteries can be lithium-ion batteries, nickel-cadmium batteries, nickel-metal hydride batteries, or nickel-hydrogen batteries.

[0003] Secondary batteries are manufactured as flexible pouch-type battery cells or rigid square or cylindrical can-type battery cells. Multiple battery cells can be formed into a stacked cell assembly.

[0004] A cell assembly may be arranged inside a module housing to form a battery module, and a plurality of battery modules may be arranged inside a pack housing to form a battery pack.

[0005] In electric vehicle batteries, heat can be generated due to high power, high speed, and repeated charging. For example, thermal runaway can occur in adjacent battery cells. Battery devices (e.g., battery modules or battery packs) may include components for cooling battery cells. If multiple battery cells are in contact with each other, thermal conductivity increases, increasing the likelihood of thermal runaway.

[0006] According to one aspect of the present disclosure, a battery cell may be provided that includes a cover capable of maintaining an appropriate temperature of the battery cell and preventing thermal transfer and thermal runaway. For example, the cover may cool the battery cell using a cooling channel through which a coolant flows.

[0007] According to one aspect of the present disclosure, a battery cell including a cover capable of improving assembly convenience may be provided.

[0008] The battery cell including a cover including a cooling channel of the present disclosure and the battery device including the same can be widely applied in green technology fields such as electric vehicles, battery charging stations, and other fields utilizing batteries, such as solar power generation and wind power generation. In addition, the battery cell including a cover including a cooling channel of the present disclosure and the battery device including the same can be used in eco-friendly electric vehicles and hybrid vehicles, etc., which prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0009] A battery cell of the present disclosure may include an electrode assembly, a case housing the electrode assembly, and a cover surrounding at least a portion of the case and including a cooling channel. The cover may include a first surface including a groove, and a second surface spaced apart from the first surface and including a protrusion. At least a portion of the case may be positioned between the first surface and the second surface.

[0010] In one embodiment, the case may include a bottom surface, a first side surface extending from the bottom surface, and a second side surface extending from the bottom surface and spaced apart from the first side surface. The cover may include a side cover including a base cover covering the bottom surface, a first side cover connected to the base cover and covering the first side surface, and a second side cover covering the second side surface.

[0011] According to one embodiment, the cooling channel may include an inlet formed in the first side cover, a connection passage formed in the base cover and connected to the inlet, and an outlet formed in the second side cover and connected to the connection passage.

[0012] In one embodiment, the side cover may include a first end facing the base cover and having a first width, and a second end opposite the first end and having a second width shorter than the first width.

[0013] In one embodiment, the second end may include a curved portion. The flow rate of the refrigerant passing through the cooling channel located at the second end may be faster than the flow rate of the refrigerant passing through the cooling channel located at the first end.

[0014] In one embodiment, the case may include a third side positioned between the first side and the second side, and a fourth side positioned between the first side and the second side and spaced apart from the third side. The side cover may include a first extension portion forming the first side and covering at least a portion of the third side, and a second extension portion forming the second side and covering at least a portion of the fourth side.

[0015] According to one embodiment, the electrode assembly and the case may be positioned between the first side cover and the second side cover.

[0016] According to one embodiment, the battery cell may further include a sealing member disposed on the side cover and surrounding at least a portion of the cooling conduit.

[0017] According to one embodiment, the base cover and the side cover may be formed integrally.

[0018] In one embodiment, the first side may face a first direction, and the second side may face a second direction opposite to the first direction.

[0019] According to one embodiment of the present disclosure, a battery device may include a plurality of battery cells and a frame accommodating the plurality of battery cells. Each of the plurality of battery cells may include an electrode assembly, a case accommodating the electrode assembly, and a cover surrounding at least a portion of the case and including a cooling channel. The cover may include a first surface including a groove, and a second surface spaced apart from the first surface and including a protrusion. At least a portion of the case may be positioned between the first surface and the second surface.

[0020] According to one embodiment, the plurality of battery cells can be coupled to each other using the cover having the groove and the protrusion formed therein.

[0021] According to one embodiment, the cases of the plurality of battery cells may be spaced apart from each other.

[0022] According to one embodiment of the present disclosure, the cooling efficiency of a battery cell can be increased and thermal runaway can be prevented.

[0023] According to one embodiment of the present disclosure, the convenience of assembling a plurality of battery cells can be improved.

[0024] FIG. 1 is a perspective view of a battery cell according to one embodiment.

[0025] FIG. 2 is a top view of a battery cell according to one embodiment.

[0026] FIG. 3A illustrates a first extension portion including a first side of a cover, according to one embodiment. FIG. 3B illustrates a second extension portion including a second side of the cover, according to one embodiment.

[0027] FIGS. 4A and 4B are schematic diagrams illustrating the structure of a cooling channel according to one embodiment.

[0028] FIGS. 5A, 5B, and 5C are perspective views of a side cover according to one embodiment.

[0029] FIG. 6 is a schematic diagram of a battery cell including a sealing structure according to one embodiment.

[0030] FIG. 7 is a top view of a battery device according to one embodiment.

[0031] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, these are merely exemplary and the present disclosure is not limited to the specific embodiments described as examples.

[0032] The terms and words used in this specification and claims described below are not to be construed as limited to their conventional or dictionary meanings. The inventor will interpret these terms and concepts in a way that best describes the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concepts of the terms to best explain his or her invention.

[0033] Accordingly, it will be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present disclosure and do not represent all of the technical ideas of the present disclosure, and that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings. In the attached drawings, identical components are represented by identical symbols, where possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the gist of the present disclosure are omitted. In the attached drawings, some components are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect their actual sizes.

[0035]

[0036] FIG. 1 is a perspective view of a battery cell according to one embodiment. FIG. 2 is a top view of a battery cell according to one embodiment.

[0037] Referring to FIG. 1 and / or FIG. 2, a battery cell (100) may include an electrode assembly (110), a case (120), and a cover (200).

[0038] In one embodiment, the battery cell (100) may be a square secondary battery cell. For example, the battery cell (100) may be a lithium ion battery or a nickel metal hydride battery capable of being charged and discharged.

[0039] In one embodiment, the electrode assembly (110) may include components for charging and / or discharging. For example, the electrode assembly (110) may include at least one positive electrode plate, at least one negative electrode plate, and at least one separator. The electrode assembly (110) may be housed within a case (120).

[0040] The structure of the electrode assembly (110) can be selectively designed. For example, the electrode assembly (110) can be a wound jelly roll type assembly, a Z-folding type assembly including a separator folded multiple times, or a stack type assembly.

[0041] The case (120) forms at least a portion of the exterior of the battery cell (100) and can accommodate the electrode assembly (110). For example, the case (120) can provide a space in which the electrode assembly (110) and an electrolyte (not shown) are accommodated. In one embodiment, the case (120) can include aluminum. The case (120) can be referred to as a can or a housing.

[0042] The case (120) may have a substantially rectangular parallelepiped shape with at least a portion of the case being open. For example, the case (120) may include a bottom surface (120a), a first side surface (120b), a second side surface (120c) opposite the first side surface (120b), a third side surface (120d) positioned between the first side surface (120b) and the second side surface (120c), and a fourth side surface (120e) positioned between the first side surface (120b) and the second side surface (120c) and opposite the third side surface (120d). The second side surface (120c) may be spaced apart from the first side surface (120b). The fourth side surface (120e) may be spaced apart from the third side surface (120d).

[0043] The side surfaces (120a, 120b, 120c, 120d) may be substantially perpendicular to the bottom surface (120a). The bottom surface (120a) may face in an opposite direction of the cap assembly (130). The widths of the first side surface (120b) and the second side surface (120c) may be narrower than the widths of the third side surface (120d) and the fourth side surface (120e). In one embodiment, the first side surface (120b) and the second side surface (120c) may be referred to as a first narrow side surface and a second narrow side surface, respectively, and the third side surface (120d) and the fourth side surface (120e) may be referred to as a first wide side surface and a second wide side surface, respectively.

[0044] According to one embodiment, the battery cell (100) may include a cap assembly (130). The cap assembly (130) may be coupled with a case (120) to form a receiving space for receiving an electrode assembly (110) and an electrolyte.

[0045] The cap assembly (130) may include a positive terminal (131) and a negative terminal (132). The positive terminal (131) and the negative terminal (132) may be electrically connected to the positive plate and the negative plate of the electrode assembly (110), respectively. According to one embodiment, the cap assembly (130) may include unillustrated components (e.g., a venting portion, an electrolyte injection port) used for the function of the battery cell (100).

[0046] In one embodiment, the cover (200) may surround at least a portion of the case (120). For example, the cover (200) may include a base cover (210) covering the bottom (120a) of the case (120) and a side cover (220) covering at least a portion of the side surfaces (120b, 120c, 120d, 120e).

[0047] The side cover (220) may include a first side cover (221) connected to one end of the base cover (210) and covering the first side (120b), and a second side cover (222) connected to the other end of the base cover (210) and covering the second side (120c). According to one embodiment, the electrode assembly (110) and the case (120) may be positioned between the first side cover (221) and the second side cover (222). For example, the case (120) may be assembled while being inserted between the first side cover (221) and the second side cover (220).

[0048] In one embodiment, the base cover (210) and the side cover (220) may be formed integrally. In one embodiment, the side cover (220) may include a first end (223) connected to the base cover (210) and a second end (224) opposite the first end (223).

[0049] According to one embodiment, the cover (200) may include a cooling conduit (230) for cooling the battery cell (100). The cooling conduit (230) may provide a path for a coolant (e.g., air or coolant) to flow. According to one embodiment, the cooling conduit (230) may include an inlet (231) formed in a first side cover (221) and an outlet (232) formed in a second side cover (222). The inlet (231) and the outlet (232) may be connected using a connection passage formed in the base cover (210) (e.g., the connection passage (233) of FIG. 4A). For example, the coolant delivered to the inlet (231) may pass through the inlet (231) and the connection passage (233) and be discharged to the outlet (232).

[0050] At least a portion of the heat generated in the electrode assembly (110) can be transferred to the case (120). Since the cover (200) surrounds at least a portion of the case (120), the heat of the battery cell (100) can be dispersed. For example, the battery cell (100) can be cooled by the cooling passage (230) of the cover (200). The amount of heat transferred to the surface of the battery cell (100) (e.g., in the ZX plane direction) can be greater than the amount of heat transferred in the stacking direction of the battery cell (100) (e.g., in the Y-axis direction). Since the cover (200) surrounds the bottom (120a), the first side (120a), and the second side (120b) of the case (120), the heat dissipation effect of the cover (200) can be improved.

[0051] According to one embodiment, the cover (200) of one battery cell (100) may have a structure for being coupled with the cover (200) of another battery cell (100). For example, the cover (200) may include a groove (240) and a protrusion (250).

[0052] In one embodiment, the groove (240) and the protrusion (250) may be formed in the side cover (220). For example, the groove (240) may be formed in the first surface (200a) of the side cover (220), and the protrusion (250) may be formed in the second surface (200b) of the side cover (220). The second surface (200b) may be positioned opposite the first surface (200a). For example, a first direction toward which the first surface (200a) faces is opposite to a second direction toward which the second surface (200b) faces, and the first surface (200a) and the second surface (200b) may be spaced apart from each other. In one embodiment, at least a portion of the case (120) may be positioned between the first surface (200a) and the second surface (200b).

[0053] According to one embodiment, the protrusion (250) of one battery cell (100) can be inserted into the groove (240) of another battery cell (100). The groove (240) and the protrusion (250) can be formed in the cover (200) so as to face each other when the plurality of battery cells (100) are aligned. For example, the groove (240) can include at least one first groove (241) formed in the first surface (200a) of the first side cover (221) and at least one second groove (242) formed in the first surface (200a) of the second side cover (222). The protrusion (250) may include at least one first protrusion (251) formed on the second surface (200b) of the first side cover (221) and at least one second protrusion (252) formed on the second surface (200b) of the second side cover (222).

[0054] According to one embodiment, the side cover (220) may cover at least a portion of a wide surface (e.g., a third side surface (120d) and a fourth side surface (120e)) of the case (120). For example, the side cover (220) may include a first extension portion (225) covering at least a portion of the third side surface (120d) and a second extension portion (226) covering at least a portion of the fourth side surface (120e). The first extension portion (225) may form a first surface (200a). The second extension portion (226) may form a second surface (200b). For example, the first surface (200a) may refer to an outer surface of the first extension portion (225). The second surface (200b) may refer to an outer surface of the second extension portion (226). According to one embodiment, the first extension (225) may include the groove (240). The second extension (226) may include the protrusion (250).

[0055]

[0056] FIG. 3A illustrates a first extension portion including a first side of a cover, according to one embodiment. FIG. 3B illustrates a second extension portion including a second side of the cover, according to one embodiment.

[0057] Referring to FIGS. 3A and 3B, the cover (200) may include a first extension portion (225) having a groove (240) formed therein and a second extension portion (226) having a protrusion (250) formed therein. The description of the cover (200), extension portions (225, 226), groove (240), and / or protrusion (250) of FIGS. 1 and / or 2 may be applied to FIGS. 3A and 3B.

[0058] In one embodiment, the extensions (225, 226) may have a structure for coupling to another battery cell (100). For example, a first extension (225) of one battery cell (100) may face a second extension (226) of another battery cell (100). A groove (240) of the first extension (225) may accommodate a protrusion (250) of the second extension (226).

[0059] As the protrusion (250) is inserted into the groove (240), a plurality of battery cells (100) can be assembled. By assembling using the groove (240) and the protrusion (250) of the cover (200), the convenience of assembling the battery cells (100) is improved, and a separate adhesive material may not be required. According to one embodiment, by assembling using the groove (240) and the protrusion (250) of the cover (200), the bonding strength of the plurality of battery cells (100) can be improved.

[0060] In one embodiment, the home (240) may be a linear empty space formed on the first surface (200a). The protrusion (250) may be a portion of the cover (200) that protrudes linearly from the second surface (200b).

[0061] According to one embodiment, the structure (shape and / or number) of the groove (240) and / or the protrusion (250) can be optionally changed. According to one embodiment, the first extension (225) can include a plurality of grooves (240). For example, the groove (240) can include a first groove (240a) and a second groove (240b) spaced apart from the first groove (240a). According to one embodiment, the second extension (226) can include a plurality of protrusions (250). For example, the protrusion (250) can include a first protrusion (250a) and a second protrusion (250b) spaced apart from the first protrusion (250a).

[0062]

[0063] FIGS. 4A and 4B are schematic diagrams illustrating the structure of a cooling channel according to one embodiment. For example, FIG. 4A is a side cross-sectional view of a cover (200). FIG. 4B is a cross-sectional view of the cover in an unfolded state, viewed from above. For convenience of explanation, the cover (200) of FIG. 4B is illustrated in an unfolded state. However, those skilled in the art will understand that the side cover (220) of FIG. 4B is structured to be formed substantially perpendicular to the base cover (210).

[0064] FIGS. 5A, 5B, and 5C are perspective views of side covers according to one embodiment. For example, FIGS. 5A, 5B, and 5C are perspective views of a portion of a cover (200), such as a first side cover (221) or a second side cover (222).

[0065] Referring to FIGS. 4a, 4b, 5a, 5b, and / or 5c, the cover (200) (e.g., the side cover (220)) may form a cooling passage (230). The description of the configuration of the base cover (210), the side cover (220), and / or the cooling passage (230) of FIGS. 1 and / or 2 may be applied to the base cover (210), the side cover (220), and / or the cooling passage (230) of FIGS. 4a, 4b, 5a, 5b, and / or 5c.

[0066] The side cover (220) may include a cooling passage (230). The cooling passage (230) may include an inlet (231) and an outlet (232) formed in the side cover (220). The cooling passage (230) may include a connection passage (233) formed in the base cover (210). The side cover (220) may include a first end (223) connected to the base cover (210) and a second end (224) opposite to the first end (223). The inlet (231) and the outlet (232) of the cooling passage (230) may be formed in the second end (224). For example, the inlet (231) may be formed at the second end (224) of the first side cover (221), and the outlet (232) may be formed at the second end (224) of the second side cover (222). The inlet (231) may be connected to one end of the connecting passage (233). The outlet (232) may be connected to the other end of the connecting passage (233).

[0067] According to one embodiment, the side cover (220) may have a structure for improving the flow rate of the refrigerant passing through the cooling passage (230). The first width (W1) of the first end (223) may be substantially the same as the width of the base cover (210). The second width (W2) of the second end (224) may be narrower than the first width (W1) of the first end (223). The cross-sectional area of ​​the cooling passage (230) may be changed in accordance with the shape of the side cover (220). For example, the cross-sectional area of ​​a portion of the cooling passage (230) formed by the second end (224) (e.g., the inlet (231) and the outlet (232)) may be smaller than the cross-sectional area of ​​the cooling passage (230) or the connecting passage (233) formed by the first end (223).

[0068] The cross-sectional area of ​​the inlet (231) and the cross-sectional area of ​​the outlet (232) may each be smaller than the cross-sectional area of ​​the connection passage (233). Due to the shape of the cooling passage (230), the flow rate of the coolant in the inlet (231) and the outlet (232) may be faster than the flow rate of the coolant in the connection passage (233). As the flow rate of the coolant increases in the inlet (231) and the outlet (232), the heat dissipation effect of the battery cell (100) may be improved. For example, the path (P) along which the coolant flows may be formed along the longitudinal direction of the battery cell (100) (e.g., the Z-axis direction in FIG. 1)), thereby improving heat transfer in the longitudinal direction. Due to the shape of the cooling passage (230), the flow of the coolant may be improved. For example, turbulence at the second end (224) may be reduced.

[0069] In one embodiment, the first end (223) may face an electrode assembly (e.g., electrode assembly (110) of FIG. 1), and the second end (224) may face a cap assembly (e.g., cap assembly (130) of FIG. 1).

[0070] According to one embodiment, the shape of the second end (224) of the side cover (220) can be selectively designed. For example, if it is a structure that can improve the flow rate of the refrigerant in the cooling channel (230) (e.g., the inlet (231) or the outlet (232)) located at the second end (224), the shape of the second end (224) is not limited. According to one embodiment, the cross-sectional area of ​​the cooling channel (230) formed inside the second end (224) can have a shape in which it gradually decreases. The flow rate of the refrigerant passing through the cooling channel (230) located at the second end (224) can be faster than the flow rate of the refrigerant passing through the cooling channel (230) located at the first end (223).

[0071] According to one embodiment (e.g., FIGS. 5a and / or 5b), the second end (224) of the cover (200) may include curved portions (224a, 224b). For example, the number of inflection points of the curved portions (224a, 224b) of the cooling channel (230) may vary depending on the cooling of the battery cell (100).

[0072] According to one embodiment (e.g., FIG. 5c), the second end (224) of the cover (200) may be formed to have a continuously decreasing cross-sectional area. For example, the second end (224) may include a bevel (224c).

[0073]

[0074] FIG. 6 is a perspective view of a battery cell including a sealing structure according to one embodiment.

[0075] Referring to FIG. 6, the battery cell (100) may include a sealing member (260) disposed on the side cover (220). The description of the battery cell (100) and the side cover (220) of FIG. 1 and / or FIG. 2 may be applied to the battery cell (100) and the side cover (220) of FIG. 6.

[0076] In one embodiment, the sealing member (260) may prevent the leakage of refrigerant from the cooling passage (e.g., the cooling passage (230) of FIG. 1) or the inflow of foreign substances into the cooling passage (230). For example, the sealing member (260) may surround at least a portion of the cooling passage (e.g., the cooling passage (230) of FIG. 1). For example, the sealing member (260) may be positioned adjacent to an inlet (e.g., the inlet (231) of FIG. 1) or an outlet (e.g., the outlet (232) of FIG. 1). In one embodiment, the sealing member (260) may be an O-ring.

[0077] According to one embodiment, the battery cell (100) may be supplied with a coolant (e.g., coolant) using a coolant pipe (270). For example, the coolant delivered from the coolant pipe (270) may flow inside a cover (e.g., cover (200) of FIG. 1) to cool the battery cell (100). The coolant pipe (270) may be connected to an inlet (e.g., an inlet (231) of FIG. 1) of a first side cover (e.g., a first side cover (221) of FIG. 1) and an outlet (e.g., an outlet (232) of FIG. 1) of a second side cover (e.g., a second side cover (222) of FIG. 1). At least a portion of the sealing member (260) may be positioned between the coolant pipe (270) and the side cover (220).

[0078]

[0079] FIG. 7 is a top view of a battery device according to one embodiment.

[0080] Referring to FIG. 7, the battery device (300) may include at least one cell assembly (101) and a frame (310). The description of the battery cell (100) and / or side cover (220) of FIGS. 1 to 6 may be applied to the battery cell (100) and / or cover (220) of FIG. 7.

[0081] According to one embodiment, the battery device (300) may be a battery module, a battery pack, or a power storage system.

[0082] The cell assembly (101) may include a plurality of battery cells (100). The plurality of battery cells (100) may be connected using side covers (220). For example, the plurality of battery cells (100) may be combined using grooves (e.g., grooves (240) of FIG. 2) and protrusions (e.g., protrusions (250) of FIG. 2) formed in the first side cover (221) and the second side cover (222). By combining the plurality of battery cells (100) using the side covers (220), a heat dissipation space (102) may be formed between cases (e.g., case (120) of FIG. 1) of the plurality of battery cells (100). The heat dissipation space (102) may be an empty space formed between side surfaces (e.g., third side surfaces (120d) and fourth side surfaces (120e) of FIG. 2) of the case (120). For example, the cases (120) of the plurality of battery cells (100) may be spaced apart based on the width direction (e.g., Y-axis direction) of the battery cells (100). The arrangement method of the cell assembly (101) illustrated in FIG. 7 is optional. For example, the number of battery cells (100) included in one cell assembly (101) may be optionally changed.

[0083] The frame (310) can accommodate at least one cell assembly (101). For example, the frame (310) can include a bottom portion supporting the bottom surface of the cell assembly (101), a cover portion (not shown) covering the upper portion of the cell assembly (101), and a side wall connecting the bottom portion and the cover portion.

[0084] According to one embodiment, the battery device (300) may include a battery control unit (320) for controlling the battery cells (100). The battery control unit (320) may be disposed within the frame (310). The battery control unit (320) may include a battery management system (BMS). The configuration of the battery control unit (320) is known in various forms, and thus a detailed description thereof will be omitted. In one embodiment, the battery control unit (320) may be referred to as a processor.

[0085] According to one embodiment, the battery device (300) may include a bulkhead (330) positioned within the frame (310). The bulkhead (330) may be positioned within the frame (310) to reinforce the rigidity of the frame (310). The cell assembly (101) may be positioned between a plurality of bulkheads (330).

[0086] According to one embodiment, the battery device (300) may include a duct member (340) positioned within the frame (310). The duct member (340) may include venting holes that provide a path for gases and / or flames discharged from the cell assembly (101).

[0087]

[0088] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be included without departing from the scope of the present invention.

[0089] While the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. For example, the present invention can be implemented by deleting some components from the aforementioned embodiments, and the embodiments can also be implemented in combination with each other.

Claims

1. Electrode assembly; a case accommodating the electrode assembly; and A cover surrounding at least a portion of the case and including a cooling passage, The cover comprises a first surface including a home, and a second surface spaced apart from the first surface and including a protrusion, A battery cell, at least a portion of which is positioned between the first side and the second side of the case.

2. In paragraph 1, The case includes a bottom, a first side extending from the bottom, and a second side extending from the bottom and spaced apart from the first side, A battery cell including a base cover covering the bottom surface, a side cover connected to the base cover and including a first side cover covering the first side, and a second side cover covering the second side.

3. In paragraph 2, A battery cell in which the cooling channel includes an inlet formed in the first side cover, a connection passage formed in the base cover and connected to the inlet, and an outlet formed in the second side cover and connected to the connection passage.

4. In paragraph 2, The side cover has a first end facing the base cover and has a first width, and A battery cell comprising a second end opposite to the first end and having a second width shorter than the first width.

5. In paragraph 4, The second end includes a curved portion, A battery cell in which the flow rate of the coolant passing through the cooling channel located at the second end is faster than the flow rate of the coolant passing through the cooling channel located at the first end.

6. In paragraph 2, The case includes a third side positioned between the first side and the second side, and a fourth side positioned between the first side and the second side and spaced apart from the third side, A battery cell wherein the side cover comprises a first extension portion forming the first side and covering at least a portion of the third side, and a second extension portion forming the second side and covering at least a portion of the fourth side.

7. In paragraph 2, The above electrode assembly and the above case are battery cells located between the first side cover and the second side cover.

8. In paragraph 2, A battery cell further comprising a sealing member disposed on the side cover and surrounding at least a portion of the cooling channel.

9. In paragraph 2, A battery cell in which the above base cover and the above side cover are formed integrally.

10. In paragraph 1, A battery cell wherein the first side faces a first direction and the second side faces a second direction opposite to the first direction.

11. Multiple battery cells; and including a frame accommodating the plurality of battery cells, Each of the above plurality of battery cells electrode assembly; a case accommodating the electrode assembly; and A cover surrounding at least a portion of the case and including a cooling passage, The cover comprises a first surface including a home, and a second surface spaced apart from the first surface and including a protrusion, A battery device wherein at least a portion of the case is located between the first side and the second side.

12. In paragraph 11, A battery device in which the plurality of battery cells are coupled to each other using the cover in which the groove and the protrusion are formed.

13. In paragraph 11, A battery device wherein the cases of the plurality of battery cells are spaced apart from each other.

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