Battery cell and battery module comprising the same

Abstract

The present invention relates to a battery cell and a battery module including the same. The battery cell according to the present invention has an outer surface composed of a corrosion-preventing layer and a resin layer, which prevents corrosion even when a direct water cooling method is applied, prevents current flow, and has a low risk of fire. The battery module according to the present invention includes the battery cell as described above and has a special waterproof structure, which prevents leakage of the coolant. Furthermore, it allows the use of ordinary cooling water as a coolant, thereby reducing costs and improving cooling performance.

Description

Technology Field

[0001] The present invention relates to a battery cell and a battery module including the same. Background Technology

[0002] A battery is a device that converts and stores electrical energy in the form of chemical energy to supply power to electrical devices, and produces electricity when needed. In particular, reusable secondary batteries are widely used not only in portable devices but also in electric vehicles and hybrid vehicles.

[0003] Since the unit cell of a secondary battery has an operating voltage of 5V or less, when secondary batteries are used in vehicles or other vehicles with high power consumption, they are used in the form of a pack containing a module with multiple battery cells built in for long-term use and high output voltage.

[0004] Recently, direct water cooling methods involving direct contact of a coolant with the battery cells have been researched to improve the cooling performance of battery modules or battery packs. However, direct water cooling carries the risk of leakage as the coolant enters the interior of the battery module or pack, is prone to cell corrosion due to the direct contact of the coolant with the cells, and poses a fire risk if electrical insulation is inadequate.

[0005] To prevent this, insulating oil is used as a coolant, or special coolants that are non-polar and corrosion-resistant are used; however, insulating oil has the problem of being vulnerable to fire, while special coolants involve complex processes and high costs. The problem to be solved

[0006] The present invention provides a battery cell and a battery module including the same, which can prevent leakage and corrosion even when a direct water cooling method is applied, has no current flow, and has a low risk of fire. means of solving the problem

[0007] The present invention provides a battery cell comprising: a case accommodating an electrode assembly; a corrosion-preventing layer formed on the outer surface of the case; and a resin layer formed on the outer surface of the corrosion-preventing layer.

[0008] In one embodiment, the electrode assembly has an anode, a cathode, and a separator between the anode and the cathode, is wound, and the case comprises nickel-plated iron, and the case may be cylindrical.

[0009] In one embodiment, the corrosion-resistant layer may comprise one or more selected from the group consisting of phosphates, silicates, organic acid salts, and rubber.

[0010] In one embodiment, the resin layer may be a heat-shrinkable polymer film.

[0011] In one embodiment, the resin layer may comprise one or more selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET), and polyvinyl chloride (PVC).

[0012] In addition, the present invention provides a battery module comprising a plurality of battery cells having a case for accommodating the batteries and a frame for accommodating the plurality of battery cells, wherein the battery cell comprises a corrosion-preventing layer formed on the outer surface of the case and a resin layer formed on the outer surface of the corrosion-preventing layer.

[0013] In one embodiment, the battery module may further include a coolant filled between a plurality of battery cells; and a waterproof layer formed along the longitudinal direction of the battery cells from the frame and covering each of the two ends of the plurality of battery cells.

[0014] In one embodiment, when the height of the waterproof layer is W￢1 and the height from the end of the battery cell covered by the waterproof layer is W￢2, (W1-W2) <W2의 관계를 만족할 수 있다.

[0015] In one embodiment, the frame comprises: a first case including an upper frame extending in the thickness direction of the battery cell and supporting one end of the battery cell, and a first side frame extending in the length direction of the battery cell; and a second case including a lower frame extending in the thickness direction of the battery cell and supporting the other end of the battery cell, and a second side frame extending in the length direction of the battery cell, wherein the first side frame is spaced apart from the lower frame by a predetermined distance, and the second side frame can be in contact with the upper frame.

[0016] In one embodiment, the battery module may include: a first waterproof layer formed in the longitudinal direction of the battery cell from the upper frame within a first case and covering one end of the battery cell; a second waterproof layer formed in the longitudinal direction of the battery cell from the lower frame within a second case and covering the other end of the battery cell; and a coolant formed between the first waterproof layer and the second waterproof layer within the first case.

[0017] In one embodiment, the coolant may be cooling water.

[0018] In addition, the present invention may provide a battery cell comprising a cylindrical case, an electrode assembly housed within the cylindrical case and including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a corrosion-preventing layer formed on the outer surface of the cylindrical case and including a rust-preventing agent, and a resin layer formed to surround the corrosion-preventing layer, which is configured to allow moisture and oxygen to pass through but prevent the rust-preventing agent from passing through.

[0019] In addition, the present invention may provide a battery module comprising a plurality of battery cells having a case for accommodating the batteries and a frame for accommodating the plurality of battery cells, wherein the frame has an inlet port for supplying a coolant from the outside, a receiving space for accommodating the introduced coolant and including a space between the outer surfaces of adjacent battery cells, and a discharge port for discharging the coolant within the receiving space to the outside, and each battery cell is formed on the outer surface of the case, and the battery module may include a corrosion-preventing layer containing a rust-preventing agent and a resin layer formed on the outer surface of the corrosion-preventing layer.

[0020] In one embodiment, the battery module may additionally include a waterproof layer that is fixed to a frame and covers both ends of the outer surface of a plurality of battery cells.

[0021] In one embodiment, the inlet port and the outlet port each include a connector portion capable of being connected to an external pipe, and the coolant may be cooling water.

[0022] In addition, the present invention can provide a vehicle including the battery module. Effects of the invention

[0023] As described above, the battery cell according to the present invention has an outer surface composed of a corrosion-preventing layer and a resin layer, which can prevent corrosion even when a direct water cooling method is applied, has the effect of preventing current flow, and has a low risk of fire.

[0024] In addition, the battery module according to the present invention includes a battery cell as described above and has a special waterproof structure, which can prevent leakage of the coolant, and can lower costs and improve cooling performance by allowing the use of ordinary cooling water as the coolant. Brief explanation of the drawing

[0025] FIG. 1 is a drawing showing a battery cell according to one embodiment of the present invention. FIG. 2 is a drawing showing a battery module according to one embodiment of the present invention. FIG. 3 is a drawing showing an enlarged view of a battery cell having a waterproof layer formed thereon according to one embodiment of the present invention. FIG. 4 is a drawing showing a battery module further comprising a first holder part and / or a second holder part according to one embodiment of the present invention. FIG. 5 is a drawing showing a battery module further comprising a bus bar and / or a third holder portion according to one embodiment of the present invention. FIG. 6 is a drawing showing the upper and lower parts of the first frame inverted form as an embodiment of the manufacturing method of the present invention. FIG. 7 is a drawing showing a manufacturing method that includes a bus bar and a third holder part as an embodiment of the manufacturing method of the present invention. FIG. 8 is a drawing showing a second frame having a second waterproof layer formed thereon, as an embodiment of the manufacturing method of the present invention. FIG. 9 is a drawing showing an embodiment of the manufacturing method of the present invention, wherein a first frame on which a plurality of battery cells are seated is flipped over and fixed to a second frame on which a second waterproof layer is formed. FIG. 10 is a drawing showing a battery module showing the circulation of a coolant as an embodiment of the manufacturing method of the present invention. Specific details for implementing the invention

[0026] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description.

[0027] However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0028] In the present invention, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0029] Therefore, the configurations illustrated in the embodiments described in this specification are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, various equivalents and modifications that can replace them may exist at the time of filing this application.

[0031] FIG. 1 is a drawing showing a battery cell according to one embodiment of the present invention.

[0032] Referring to FIG. 1, the battery cell (100) includes a case (20) that accommodates the battery (10), a corrosion-resistant layer (30) formed on the outer surface of the case, and a resin layer (40) formed on the outer surface of the corrosion-resistant layer.

[0033] The above battery (10) may include an electrode assembly and an electrolyte.

[0034] The electrode assembly is housed within a case and includes an anode, a cathode, and a separator between the anode and the cathode. The electrode and the membrane may be an integrated electrode assembly. Specifically, the electrode assembly may be a jelly-roll type electrode assembly in which sheet-type anodes and cathodes are wound with a separator interposed, a stack type electrode assembly in which a plurality of anodes and cathodes are sequentially stacked with a separator interposed, or a stack / folding type electrode assembly in which unit cells, each consisting of a predetermined number of anodes and cathodes stacked with a separator interposed, are positioned on a separator film and sequentially wound.

[0035] The above case (20) accommodates the battery (10) and serves to protect the battery from external shocks. The above case may be cylindrical, pouch-type, or prismatic, and for example, the above case may be cylindrical. In particular, the electrode assembly may be in a wound state, and the case may be a cylindrical case.

[0036] At this time, the case (20) may be formed of nickel-plated iron. By making the case of the above material, sufficient rigidity can be provided against external impacts, and corrosion can be minimized by nickel plating.

[0037] The above corrosion-preventing layer (30) may include a rust inhibitor. Specifically, the above corrosion-preventing layer (30) may include one or more selected from the group consisting of phosphates, silicates, organic acid salts, and rubber. The corrosion-preventing layer (30) may be manufactured by applying and curing it on a case, and specifically, methods such as spraying may be used.

[0038] Additionally, the resin layer (40) may be formed from a heat-shrinkable polymer film. By using a heat-shrinkable polymer film as the resin layer (40), the insulation of the battery cell can be prevented from being destroyed while impregnated with cooling water.

[0039] The resin layer (40) may include one or more selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET) and polyvinyl chloride (PVC), and a polymer film may be inserted into a case on which a corrosion-resistant layer (30) is formed, and then heated to heat shrink it, thereby forming a resin layer (40) formed of a heat-shrinkable polymer film on the surface of the corrosion-resistant layer (30).

[0041] FIG. 2 is a drawing showing a battery module according to one embodiment of the present invention.

[0042] Referring to FIG. 2, the present invention comprises a battery module (500) including a plurality of battery cells (100) having a case for accommodating the battery cells and a frame (210, 220) for accommodating the plurality of battery cells, wherein the battery cells may include a corrosion-resistant layer (30) formed on the outer surface of the case (20) and a resin layer (40) formed on the outer surface of the corrosion-resistant layer.

[0043] The battery module (500) according to the present invention includes a corrosion prevention layer (30) formed on the outer surface of the case (20) of the battery cell (100) and a resin layer (40) formed on the outer surface of the corrosion prevention layer. This ensures that even if a coolant comes into direct contact with the battery cell, current flow can be prevented by the resin layer (40) formed on the outermost surface of the battery cell, and even if moisture and oxygen permeate through the resin layer (40), contact between moisture and oxygen and the battery cell case (20) is blocked by the corrosion prevention layer (30), thereby preventing corrosion of the battery cell.

[0044] The above frame serves to protect a plurality of battery cells (100) inside the battery module by absorbing or cushioning external shocks to the battery module (500). The above frame (200) may include a first frame (210) and a second frame (220), wherein the first frame (210) includes an upper frame (212) and a first side frame (214), and the second frame (220) includes a lower frame (222) and a second side frame (224).

[0045] The upper frame (212) of the first frame (210) supports one end (110) of the battery cell (100) and extends in the radial direction of the battery cell, and the first side frame (214) of the first frame (210) is formed to extend from the upper frame (212) in the longitudinal direction of the battery cell (100).

[0046] Additionally, the lower frame (222) of the second frame (220) supports the other end (120) of the battery cell (100) and extends in the radial direction of the battery cell, and the second side frame (224) of the second frame (220) is formed extending from the lower frame (222) in the longitudinal direction of the battery cell (100). The second side frame (224) may be formed extending from both ends of the lower frame (222).

[0047] At this time, the first side frame (214) may be spaced apart from the lower frame (222) by a predetermined distance and may be spaced apart from the second side frame (224) by a predetermined distance in the inner direction where the battery cell (100) is located, and the second side frame (224) may come into contact with the upper frame (212). Specifically, the second side frame (224) may come into contact with and be sealed with the end of the upper frame (212). The second side frame (224) and the upper frame (212) may be sealed by adhesive or by welding, such as laser welding.

[0048] In this way, a plurality of battery cells (100) can form a sealed structure by means of the upper frame (212) of the first frame (210) and the lower frame (222) of the second frame (220) that support one end (110) and the other end (120) of the battery cell (100), and the second side frame (224) of the second frame (220) that forms the outer surface of the frame, and the first side frame (214) can be formed inwardly where the battery cell is located, spaced apart from the second side frame (224).

[0049] At this time, the first side frame (214) may be spaced apart from the battery cell located at the outermost edge of the plurality of battery cells at a predetermined distance.

[0050] The first frame (210) and the second frame (220) may be plastic or metal.

[0051] Additionally, the battery module (500) according to the present invention may further include a cooling agent (300) filled between a plurality of battery cells (100) and a waterproof layer (400) formed along the length direction of the battery cells from the frame (200) and covering each of the two ends (110, 120) of the plurality of battery cells.

[0052] Specifically, the waterproof layer (400) may include a first waterproof layer (410) formed in the length direction of the battery cell from the upper frame (212) within the first frame (210) to cover one end (110) of the battery cell (100), and a second waterproof layer (420) formed in the length direction of the battery cell from the lower frame (222) within the second frame (220) to cover the other end (120) of the battery cell (100).

[0053] Referring to FIG. 3, when the height of the waterproof layer is W1 and the height from the end of the battery cell covered by the waterproof layer is W2, (W1-W2) <W2의 관계를 만족할 수 있다.

[0054] A vent portion (130) may be provided at one end of the battery cell to vent gas or flames generated inside the battery cell (100) to the outside. When W3 is the height obtained by subtracting the height (W2) from the end of the battery cell covered by the waterproof layer from the height (W1) of the waterproof layer in the battery module according to the present invention, by setting the height of W3 lower than the height of W2, the internal pressure of the battery cell (100) increases above a certain level, and when venting through the vent portion (130), the waterproof layer (400) is easily broken, allowing gas or flames to be discharged more easily to the outside of the battery cell (100).

[0055] Specifically, W1 is the height of the first waterproof layer (410), and W2 may be one end (110) of the battery cell covered by the first waterproof layer (410).

[0056] Additionally, the coolant (300) may be accommodated in the space between the first waterproof layer (410) and the second waterproof layer (420) within the first frame (210). The coolant (300) may be cooling water or insulating oil.

[0057] At this time, the term "inside the first frame (210)" refers to a battery cell (100) receiving space formed along the inner surface of the upper frame (212) and the first side frame (214) of the first frame, and the term "inside the second frame (220)" refers to a battery cell (100) receiving space formed along the inner surface of the lower frame (222) and the second side frame (224) of the second frame.

[0058] The battery module (500) according to the present invention includes a waterproof layer (400), thereby allowing a plurality of battery cells to be fixed and bonded, and preventing the coolant from leaking outside the frame. In addition, the cooling efficiency can be increased as the coolant (300) is filled between the plurality of battery cells and comes into direct contact with the battery cells.

[0060] Referring to FIG. 4, the first frame (210) and / or the second frame (220) may each further include a first holder portion (216) and / or a second holder portion (226). The first holder portion (216) and the second holder portion (226) may each be formed to protrude a predetermined length in the longitudinal direction of the battery cell from the upper frame (212) of the first frame (210) and the lower frame (222) of the second frame (220). The first holder portion (216) and the second holder portion (226) may be formed as at least one or more to partition and support the plurality of battery cells (100) within the first frame (120) and the second frame (220), respectively.

[0061] In the case where the battery module (500) according to the present invention includes a first holder portion (216), the first waterproof layer (410) may be filled between the first side frame (214) and the first holder portion (216) or between a plurality of first holder portions (216). Additionally, in the case where the battery module according to the present invention includes a second holder portion (226), the second waterproof layer (420) may be filled between the second side frame (224) and the second holder portion or between a plurality of second holder portions (226).

[0062] The above waterproof layer (400), the first waterproof layer (410), or the second waterproof layer (420) may be a thermally conductive adhesive. Additionally, the above waterproof layer (400), the first waterproof layer (410), or the second waterproof layer (420) may be a potting resin and may include a silicone resin, an acrylic resin, an epoxy resin, or a urethane resin having high cooling and adhesive performance.

[0063] Referring to FIG. 5, the battery module (500) according to the present invention may further include a bus bar (230) formed between the lower frame (222) of the second frame (220) and the other end (120) of the battery cell and in contact with the other end (120) of the battery cell.

[0064] The above busbar (230) can electrically connect a plurality of battery cells, and the busbar (230) can be connected to the other end (120) of the plurality of battery cells through laser welding or wire bonding.

[0065] Additionally, the battery module (500) according to the present invention may further include a third holder part (240) formed between the lower frame (222) of the second frame (220) and the other end (120) of the battery cell for fixing and partitioning a plurality of battery cells.

[0066] The above-mentioned third holder portion (240) may be formed between the other end (120) of a plurality of battery cells and the bus bar (230). When the battery module (500) according to the present invention includes the third holder portion (240), the second holder portion (226) is unnecessary in the lower frame (222) of the second frame (220).

[0068] Below, a method for manufacturing a battery module (500) according to the present invention is described.

[0069] FIG. 6 shows the first frame (210) in an inverted state. Referring to FIG. 6, the first frame (210) is inverted, and then a first waterproof layer (400) is formed within the first frame (210). That is, a potting resin can be filled to a predetermined height along the inner surface of the upper frame (212) and the first side frame (214) of the first frame (210) to form the first waterproof layer (410). At this time, if the first frame (210) further includes a first holder part (216), the first waterproof layer (410) may be formed lower than the height of the first holder part (216). A plurality of battery cells (100) are inverted and fixed and seated on the first frame (210) in which the first waterproof layer (410) is formed, so that one end of each cell faces downward (toward the first waterproof layer). When the first holder portion (216) is formed, each battery cell (100) can be placed and fixed and seated between the plurality of first holder portions (216).

[0070] FIG. 7 is a diagram showing a manufacturing process in which a battery module (500) according to the present invention includes a bus bar (230) and a third holder part (240). Referring to FIG. 6, the third holder part (240) and the bus bar (230) are stacked sequentially on the other end (120) of a battery cell (100) seated inside a first frame (210).

[0071] FIG. 8 is a drawing showing a second frame (220) having a second waterproof layer (420) formed thereon. Referring to FIG. 8, a second waterproof layer (420) can be formed by filling a potting resin to a predetermined height along the inner surface of the lower frame (222) and the second side frame (224) of the second frame. At this time, if the second frame (220) further includes a second holder part (226), the second waterproof layer (420) can be formed lower than the height of the second holder part (226).

[0072] FIG. 9 is a drawing showing a first frame (210) on which a plurality of battery cells (100) are mounted being flipped over and fixed to a second frame (220) on which a second waterproof layer (420) is formed. Referring to FIG. 9, the other end (120) of the battery cell (100) may be covered by the second waterproof layer, and if a bus bar (230) and / or a third holder part (240) is placed on the other end (120), the bus bar (230) and / or the third holder part (240) may also be covered by the second waterproof layer.

[0073] At this time, the first side frame (214) of the first frame (210) is positioned further inside the battery module than the second side frame (224) of the second frame (220), so that it may come into contact with the battery cell positioned at the outermost of the plurality of battery cells (100) or be spaced apart at a predetermined distance. The first side frame (214) of the first frame (210) may come into contact with the second side frame (224) of the second frame (220) or be spaced apart at a predetermined distance. Additionally, the first side frame (214) of the first frame (210) may come into contact with the lower frame (222) of the second frame (220) or be spaced apart at a predetermined distance.

[0074] The second side frame (224) of the second frame (220) contacts the upper frame (212) of the first frame (210), and by sealing the ends of the second side frame (224) and the upper frame (212) with adhesive, the frame (200) can form a sealed structure.

[0075] Referring to FIG. 2, a coolant may be introduced into the internal space formed by the first side frame (214) of the first frame (210), the first waterproof layer (410), and the second waterproof layer (420). The battery module (500) according to the present invention may be sealed after the coolant is introduced, or the coolant may flow through the inlet and outlet to fluidly circulate inside the battery module. At this time, the inlet and outlet may be formed on the same side of the battery module or on opposite sides.

[0076] Specifically, with reference to FIGS. 1, 2 and 10, the battery module is a battery module (500) comprising a plurality of battery cells having a case for accommodating the batteries and a frame for accommodating the plurality of battery cells, wherein the frame (200) may have an inlet port (610) for supplying a coolant from the outside, a receiving space (600) for accommodating the introduced coolant and including a space between the outer surfaces of adjacent battery cells, and an outlet port (620) for discharging the coolant within the receiving space to the outside.

[0077] At this time, each battery cell (100) may include a corrosion-preventing layer (30) formed on the outer surface of the case (20) and a resin layer formed to surround the corrosion-preventing layer, which allows moisture and oxygen to pass through but prevents the corrosion-preventing agent from passing through.

[0078] The inlet port (610) and the outlet port (620) of the battery module (500) may each further include a connector part (700) that can be connected to an external pipe, and may further include a coolant storage tank (720) and / or a pump (710) for supplying a coolant (300) to the inlet port (610).

[0079] The coolant (300) can be supplied into the battery module (500) by connecting to an external pipe through the connector part (700). Alternatively, the coolant can be supplied into the battery module (500) through a pump (710) or the like by separately providing a coolant storage tank (720).

[0080] The battery module according to the present invention has the above-described configuration, thereby allowing the coolant circulation device installed in the vehicle to be used as is without any separate additional device.

[0082] As such, the manufacturing method of a battery module according to the present invention discloses a very simple manufacturing method in which one end (110) of a plurality of battery cells (100) is fixed and sealed within a first frame (210) through a first waterproof layer (410), and the other end (120) of a plurality of battery cells (100) is simply fixed and sealed by inserting it into a second frame (220) in which a second waterproof layer (410) is formed. Accordingly, the efficiency of the manufacturing process can be significantly increased, the risk of leakage can be greatly reduced, and cooling efficiency can be increased.

[0083] By having the structure of the battery cell case and the battery module structure as described above, the battery module according to the present invention can prevent corrosion of the battery cell and promote insulation even when using ordinary cooling water as a coolant, and can increase stability by preventing leakage of the battery module. Explanation of the symbols

[0084] 20: Case 30: Anti-corrosion layer 40: Resin layer 100: Battery cell 110: One end 120: Other end 130: Vent section 200: Frame 210: 1st Frame 212: Upper frame 214: 1st side frame 216: First holder part 220: 2nd Frame 222: Lower frame 224: Second side frame 226: Second holder part 230: Busbar 240: Third holder part 300: Coolant 400: Waterproofing layer 410: 1st waterproofing layer 420: Second waterproofing layer 500: Battery module 600: Capacity 610: Inflow port 620: Discharge port 700: Connector section 710: Pump 720: Storage tank

Claims

Claim 1 A battery cell comprising: a case accommodating an electrode assembly; a corrosion-resistant layer formed on the outer surface of the case; and a resin layer formed on the outer surface of the corrosion-resistant layer, wherein the case comprises nickel-plated iron, the corrosion-resistant layer comprises one or more selected from the group consisting of phosphates, silicates, organic acid salts, and rubber, and the corrosion-resistant layer is formed by applying and curing the corrosion-resistant layer on the case. Claim 2 In claim 1, the electrode assembly has a positive electrode, a negative electrode, and a separator between the positive and negative electrodes, is wound, and the case is a cylindrical battery cell. Claim 3 delete Claim 4 In claim 1, the resin layer is a heat-shrinkable polymer film, forming a battery cell. Claim 5 A battery cell according to claim 1, wherein the resin layer comprises one or more selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). Claim 6 A battery module comprising a plurality of battery cells having a case for housing the batteries and a frame for housing the plurality of battery cells, wherein the battery cell comprises a corrosion-preventing layer formed on the outer surface of the case and a resin layer formed on the outer surface of the corrosion-preventing layer, wherein the case comprises nickel-plated iron, and wherein the corrosion-preventing layer comprises one or more selected from the group consisting of phosphate, silicate, organic acid salt, and rubber, and wherein the corrosion-preventing layer is applied to and cured on the case to form the battery module. Claim 7 A battery module according to claim 6, further comprising: a coolant filled between a plurality of battery cells; and a waterproof layer formed in the longitudinal direction of the battery cells from the frame and covering each of the two ends of the plurality of battery cells. Claim 8 In claim 6, the frame comprises: a first case including an upper frame that supports one end of the battery cell and extends in the thickness direction of the battery cell and a first side frame that extends in the length direction of the battery cell; and a second case including a lower frame that supports the other end of the battery cell and extends in the thickness direction of the battery cell and a second side frame that extends in the length direction of the battery cell, wherein the first side frame is spaced apart from the lower frame by a predetermined distance and the second side frame is in contact with the upper frame. Claim 9 A battery module according to claim 8, comprising: a first waterproof layer formed in the first case along the longitudinal direction of the battery cell from the upper frame and covering one end of the battery cell; a second waterproof layer formed in the second case along the longitudinal direction of the battery cell from the lower frame and covering the other end of the battery cell; and a coolant formed between the first waterproof layer and the second waterproof layer in the first case. Claim 10 In paragraph 7 or 9, the coolant is a battery module in which the coolant is a coolant. Claim 11 A battery cell comprising: a cylindrical case; an electrode assembly housed within the cylindrical case and including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; a corrosion-preventing layer formed on the outer surface of the cylindrical case and including a rust inhibitor; and a resin layer formed to surround the corrosion-preventing layer, provided to allow moisture and oxygen to pass through but not the rust inhibitor to pass through, wherein the case comprises nickel-plated iron, and the corrosion-preventing layer comprises one or more selected from the group consisting of phosphates, silicates, organic acid salts, and rubber, and wherein the corrosion-preventing layer is applied to and cured on the case. Claim 12 A battery module comprising a plurality of battery cells having a case for accommodating the batteries and a frame for accommodating the plurality of battery cells, wherein the frame has an inlet port for supplying a coolant from the outside, a receiving space for accommodating the introduced coolant and including a space between the outer surfaces of adjacent battery cells, and an outlet port for discharging the coolant within the receiving space to the outside, wherein each battery cell is formed on the outer surface of the case and includes a corrosion-preventing layer containing a rust inhibitor and a resin layer formed on the outer surface of the corrosion-preventing layer, wherein the case comprises nickel-plated iron, and the corrosion-preventing layer comprises one or more selected from the group consisting of phosphates, silicates, organic acid salts, and rubber, and wherein the corrosion-preventing layer is applied to and cured on the case to form the battery module. Claim 13 A battery module according to claim 12, further comprising a waterproof layer fixed to a frame and covering each of the two ends of the outer surface of a plurality of battery cells. Claim 14 In paragraph 12, the inlet port and the outlet port each include a connector portion capable of connecting to an external pipe, and the coolant is a coolant, a battery module. Claim 15 A vehicle comprising the battery module of paragraph 12.

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