Secondary battery module and secondary battery used therein

Abstract

A secondary battery module according to an embodiment of the present invention may comprise: a plurality of secondary batteries arranged in parallel in one direction; and a housing for accommodating the plurality of secondary batteries. At least one of the plurality of secondary batteries may include: an electrode assembly; and a battery case including an accommodating portion accommodating the electrode assembly and an edge portion connected from the accommodating portion, the battery case having an outer surface coated with a non-combustible material. The non-combustible material applied to the edge portion may be thicker than the non-combustible material applied to the receiving portion.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2022-0064228 filed on May 25, 2022 and Korean Patent Application No. 10-2022-0153107 filed on November 15, 2022, which are hereby incorporated by reference in their entirety. Technical Field

[0004] The present invention relates to a secondary battery module and a secondary battery used therein, and more particularly, to a secondary battery module including a plurality of secondary batteries and a case accommodating the plurality of secondary batteries, and a secondary battery used therein. Background Art

[0005] Recently, secondary batteries have attracted considerable attention as a power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), and the like developed to address restrictions such as air pollution caused by existing gasoline and diesel vehicles using fossil fuels.

[0006] Although one or two to three or four secondary batteries are used in small mobile devices, due to the demand for high power and large capacity in medium and large devices such as electric vehicles, a battery module in which multiple secondary battery cells are electrically connected to each other, or a battery pack in which multiple battery modules are electrically connected to each other is used.

[0007] For example, a battery module may be composed of a plurality of secondary batteries, a bus bar (or metal plate) for connecting the secondary batteries in series and / or in parallel, a sensing component for sensing voltage and temperature, an electrical component for controlling charging / discharging, and a housing for accommodating the above components. Among the currently commercialized secondary batteries, one of the most popular secondary batteries may be a lithium secondary battery, which can be divided into a can-type secondary battery and a pouch-type secondary battery according to the shape of its external material. Among them, pouch-type secondary batteries are widely used in medium and large battery modules due to their high energy density and easy stacking.

[0008] As the demand for secondary battery modules mounted on vehicles has increased recently, customers are demanding an increase in the energy density of secondary batteries within the limited space of secondary battery assemblies. In this case, there is a problem that the safety risks associated with fire and explosion of secondary batteries are also increasing.

[0009] That is, in order to ensure the safety of the vehicle driver when the secondary batteries inside the secondary battery module catch fire, a technology is needed that can delay the flame or heat propagation time between the secondary batteries inside the secondary battery module so that the driver can evacuate before the flame is exposed to the outside of the casing. Summary of the invention

[0010] Technical issues

[0011] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a secondary battery module capable of delaying the flame or heat propagation time between secondary batteries inside the secondary battery module.

[0012] Technical Solution

[0013] A secondary battery module according to an embodiment of the present invention may include: a plurality of secondary batteries, the plurality of secondary batteries being arranged side by side in one direction; and a housing configured to accommodate the plurality of secondary batteries. At least one of the plurality of secondary batteries may include: an electrode assembly; and a battery housing, the battery housing including a receiving portion accommodating the electrode assembly and an edge portion connected from the receiving portion, the battery housing having an outer surface coated with a non-combustible material. The thickness of the non-combustible material applied to the edge portion may be greater than the thickness of the non-combustible material applied to the receiving portion.

[0014] The edge portion may include: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion connected to the first edge portion and folded at least once. The incombustible material may not be applied to an end of the second edge portion.

[0015] The edge portion may include: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion connected to the first edge portion and folded at least once. The thickness of the non-combustible material applied to the first edge portion may be greater than the thickness of the non-combustible material applied to the second edge portion.

[0016] The non-combustible material may not be applied to the electrode lead connected to the electrode assembly to protrude to the outside of the edge portion.

[0017] The non-combustible material may not be applied to an insulating member configured to insulate the electrode lead from the edge portion.

[0018] The secondary battery module may further include at least one compression pad disposed adjacent to the secondary battery, wherein an outer surface of the compression pad may be coated with a non-combustible material.

[0019] The non-combustible material may include ceramics.

[0020] The surfaces of the secondary battery and the compression pad coated with the non-combustible material may be disposed to face each other.

[0021] The height of the compression pad may be higher than that of the secondary battery.

[0022] At least one or more through holes passing through the interior and the exterior may be defined in at least one region of the housing.

[0023] At least one or more through holes may be defined in the top surface of the housing.

[0024] The case may include: a body configured to surround a portion of a surface of the secondary battery; and a cover portion connected to the body to cover the remaining surface of the secondary battery. At least one or more through holes may be defined in the cover portion.

[0025] The through hole may be defined at a position facing the battery case.

[0026] The through hole may be defined at a position facing the edge portion.

[0027] A secondary battery according to an embodiment of the present invention may include: an electrode assembly; a battery case including a receiving portion in which the electrode assembly is received and an edge portion connected from the receiving portion, the battery case having an outer surface coated with a non-combustible material. The thickness of the non-combustible material applied to the edge portion may be greater than the thickness of the non-combustible material applied to the receiving portion.

[0028] The edge portion may include: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion connected to the first edge portion and folded at least once. The incombustible material may not be applied to an end of the second edge portion.

[0029] The edge portion may include: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion connected to the first edge portion and folded at least once. The thickness of the non-combustible material applied to the first edge portion may be greater than the thickness of the non-combustible material applied to the second edge portion.

[0030] The non-combustible material may not be applied to the electrode lead connected to the electrode assembly to protrude to the outside of the edge portion.

[0031] The non-combustible material may not be applied to an insulating member configured to insulate the electrode lead from the edge portion, and a portion of the insulating member protrudes to the outside of the edge portion.

[0032] The non-combustible material may include ceramics.

[0033] Beneficial effects

[0034] An advantage of the present invention is that the flame or heat propagation time between secondary batteries is delayed by applying a non-flammable material to at least one secondary battery, thereby improving the stability of a secondary battery module.

[0035] Furthermore, the present invention has an advantage in that the flame or heat propagation time between secondary batteries is delayed by applying a non-combustible material to a compression mat, thereby improving the stability of a secondary battery module.

[0036] In addition, an advantage of the present invention is that the through hole is defined to pass through the inside and the outside in at least one area of ​​the outer shell to discharge the gas inside the outer shell to the outside, thereby preventing the gas in the outer shell from being compressed, and the through hole is defined toward the battery casing (especially the edge portion), thereby minimizing the spark risk of the electrode lead and the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a front view showing the configuration of a secondary battery.

[0038] Figure 2 is an exploded perspective view showing the configuration of a secondary battery module according to Embodiment 1 of the present invention.

[0039] Figure 3a It is shown Figure 2 Conceptual diagram of a state in which secondary batteries in a secondary battery module are coated with a non-combustible material.

[0040] Figure 3b It is shown Figure 2 Conceptual diagram of a state in which a compression pad of a secondary battery module is coated with a non-combustible material.

[0041] Figure 4a It is shown in Figure 3a A cross-sectional view of a state after a secondary battery is coated with a non-combustible material.

[0042] Figure 4b It is shown in Figure 3b A cross-sectional view of a state after the compression mat is coated with a non-combustible material.

[0043] Figure 5 yes Figure 2 A perspective view of a secondary battery module.

[0044] Figure 6 It is along Figure 5 A cross-sectional view taken along line AA in FIG.

[0045] Figure 7 It is along Figure 5 A cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION

[0046] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in several different forms and is not limited or restricted by the following examples.

[0047] In order to clearly illustrate the present invention, the detailed description of the related known technology that is irrelevant to the description or may unnecessarily cover the gist of the present invention has been omitted, and in this specification, reference numerals are added to the components in each figure. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0048] Furthermore, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention, based on the principle that the inventor can appropriately define the concepts of the terms to best describe and explain his or her invention.

[0049] The present invention provides a secondary battery module 110 further including a plurality of secondary batteries 110 arranged side by side in one direction and a housing 120 accommodating the plurality of secondary batteries 110 , and wherein at least one of the secondary batteries 110 is coated with a non-combustible material.

[0050] First, the secondary battery can be configured to be arranged side by side along one direction inside the housing 120, and can include an electrode assembly (not shown) and a battery case 111 accommodating the electrode assembly. The type of the electrode assembly is not limited. For example, the electrode assembly can have a structure of any one of a roll core type (winding type), a stacked type (stacked type), or a complex type (stacked / folded type).

[0051] The electrode assembly may have a configuration in which electrodes and separators are alternately arranged. In more detail, the electrode assembly may have a configuration in which positive electrodes and negative electrodes are alternately arranged with a separator therebetween. Specifically, the electrode assembly may have a structure in which positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector are stacked in sequence, so that the positive electrode active material layer disposed on one surface of the separator faces the negative electrode active material layer disposed on the other surface of the separator.

[0052] In order to accommodate the above electrode assembly, such as Figure 1 As shown, the battery case 111 may have a structure including a receiving portion 112 receiving the electrode assembly and an edge portion 113 connected from an edge of the receiving portion 112 .

[0053] In more detail, the battery case 111 may include a accommodating portion 112 and an edge portion 113 , wherein the accommodating portion 112 is arranged by forming an area of ​​a laminated sheet in which an internal resin layer / metal layer / external resin layer are stacked sequentially from the inside to the outside, and the edge portion 113 is connected to the edge of the accommodating portion 112 .

[0054] Here, polypropylene (PP) can be used for the inner resin layer, polyethylene terephthalate (PET) can be used for the outer resin layer, and aluminum (Al) can be used for the metal layer. However, the materials of the inner resin layer, the outer resin layer, and the metal layer are not limited thereto, and when each of the inner resin layer and the outer resin layer has an insulating material, and the metal layer has a metal material, these materials can be used without particular limitation.

[0055] In addition, the accommodation portion 112 may be understood as a region having an empty space by being concavely formed so that the electrode assembly is accommodated in the battery case 111 .

[0056] In addition, the edge portion 113 may be understood as a region connected from the edge of the receiving portion 112 on the battery case 111. The edge portion 113 may have a sealing structure whose edge is sealed to prevent the electrode assembly received in the receiving portion 112 from being damaged due to exposure to external moisture or air.

[0057] In addition, the edge portion 113 may include a first edge portion 113a from which an electrode lead 114 to be described later protrudes, and a second edge portion 113b connected to the first edge portion 11.3a and folded at least once. Preferably, the second edge portion 113b may be double-sided folded (DSF).

[0058] For example, the first edge portion 113 a may be disposed at both sides of the secondary battery 110 in the full length direction, and the second edge portion 113 b may be disposed at at least one side of the secondary battery 110 in the full width direction.

[0059] The outer surface of the battery case 111 may be coated with a non-combustible material.

[0060] For example, the non-combustible material may include a ceramic material. In this case, there is an effect of preventing the insulation performance of the secondary battery 110 from being deteriorated due to exposure of the metal layer on the outer surface of the battery case 111.

[0061] That is, the metal layer may be exposed at the end of the edge portion 113a due to the structure of the battery case 111, and when the battery case 111 is manufactured, in the process of stacking the outer resin layer on the metal layer, a through hole called a pinhole may be defined in the outer resin layer to expose the metal layer to the outside. Here, a non-combustible material made of ceramics may be applied to the metal layer exposed to the outside to insulate the metal layer from the outside, thereby improving the insulation performance of the secondary battery 110.

[0062] However, if necessary, the non-combustible material may not be applied to the end 113c of the second edge portion 113b. Therefore, when gas is generated in the secondary battery 110 due to abnormally high temperature or fire, the end of the second edge portion 113b is preferentially ruptured to induce the gas to be discharged. Therefore, the gas can be discharged to the first edge portion 113a to prevent the flame from spreading through the electrode lead 114.

[0063] The secondary battery 110 may include an electrode lead 114 protruding from the battery case 111. In addition, the secondary battery 110 may further include an insulating member 115 insulating the electrode lead 114 from an edge portion 113 of the battery case 111 (more specifically, a first edge portion 113a).

[0064] Here, the electrode lead 114 may be understood as a structure protruding from the battery case 111 and electrically connected to the above-mentioned electrode assembly. In more detail, the electrode lead 114 may have one end connected to an electrode tab (not shown) provided on the electrode, and the other end protruding from the bag so as to be connected to another secondary battery 110 or an external device.

[0065] The insulating member 115 may surround a portion of the electrode lead 114. The insulating member 115 may be disposed between the edge portion 113 and the electrode lead 114. A portion of the edge portion 113 (more specifically, a portion of the first edge portion 113a) may be sealed with the insulating member 115. The insulating member 115 may be an insulating film or an insulating tape. A portion of the insulating member 115 may protrude outward from the edge portion 113.

[0066] The non-combustible material may not be applied to the electrode lead 114 , and further, not be applied to the insulating member 115 .

[0067] The secondary batteries 110 as described above may be arranged side by side along one direction, such as Figure 2 As shown, the energy density of the secondary battery module 100 in the accommodation space inside the housing 120 is increased. Here, one direction can be understood as parallel to Figure 2 The direction of the Y axis.

[0068] At this time, the outer surface of at least one secondary battery 110 may be coated with a non-combustible material to delay or prevent flame or heat from spreading to other secondary batteries adjacent thereto even when one secondary battery 110 starts to catch fire.

[0069] In this case, all the secondary batteries 110 arranged in one direction may be coated with a non-combustible material, or only some of the secondary batteries arranged in one position may be coated with a non-combustible material. In addition, needless to say, the entire outer surface of the secondary battery 110 may be coated with a non-combustible material, or only a portion of the outer surface may be coated with a non-combustible material.

[0070] Here, the non-combustible material may be any material as long as the non-combustible material can delay the propagation of flame or heat between the secondary batteries 110 adjacent to each other, and may include, for example, a ceramic material.

[0071] In addition, the non-combustible material may be applied to the secondary battery 110 in various ways. Figure 3a As shown, the non-combustible material may be sprayed onto the secondary battery 110 by a spraying device. In this case, as shown in FIG. Figure 4a As shown, a non-flammable coating layer 110 a may be formed on an outer surface of the secondary battery 110 .

[0072] like Figure 3a As shown, during the spraying of the secondary battery 110, a support member (not shown) such as a clamp may clamp the electrode lead 114 and / or the insulating member 115 to support the secondary battery. As a result, the non-combustible material may be completely applied to the battery case 111 without interfering with the support member. In addition, the non-combustible material may be prevented from being applied to the electrode lead 114 without a separate mask member.

[0073] In addition, the non-flammable coating layer 110a may be applied to the secondary battery 110 in various thicknesses, but it is preferred that the non-flammable coating layer 110a is formed on the outer surface of the secondary battery in a thickness of 0.01 mm to 1 mm.

[0074] This is because, when the thickness of the non-flammable coating 110a is less than 0.01 mm, the coating of the non-flammable material cannot proceed smoothly in the process, and uncoated areas may appear on the outer surface of the secondary battery 110, and when the thickness exceeds 1 mm, the thickness of the non-flammable coating 110a becomes too thick, resulting in the side effect of separation from the outer surface of the secondary battery.

[0075] The thickness of the non-combustible coating 110a on the edge portion 113 may be thicker than that of the non-combustible coating 110a on the receiving portion 112. That is, the thickness of the non-combustible material applied to the edge portion 113 may be thicker than that of the non-combustible material applied to the receiving portion 112. The edge portion 113 having a sealed structure by sealing is more likely to break than the receiving portion 112, so there is a risk that the flame is preferentially emitted or invaded from the edge portion 113. In order to prevent such concerns, a thick non-combustible coating 110a is formed on the edge portion 113 to delay the destruction of the seal and also delay the spread of the flame.

[0076] In addition, the thickness of the non-combustible coating 110a on the first edge portion 113a may be thicker than the thickness of the non-combustible coating 110a on the second edge portion 113b. That is, the thickness of the non-combustible material applied to the first edge portion 113a may be greater than the thickness of the non-combustible material applied to the second edge portion 113b. The first edge portion 113a from which the electrode lead 114 protrudes is susceptible to the spread of flames, and there is a possibility that the sealing strength is relatively lower than the sealing strength of the second edge portion 113b folded at least once. In order to prevent this concern, a thicker non-combustible coating 110a can be formed on the first edge portion 113a to delay the destruction of the seal and also delay the spread of the flame.

[0077] The secondary battery module 100 may further include at least one compression pad 130 disposed adjacent to the secondary battery 110 .

[0078] Here, the compression pad 130 is disposed adjacent to the secondary battery 110 in the accommodation space S of the housing 120 , and various configurations are possible.

[0079] Specifically, the compression pad 130 may be made of a deformable material to prevent module damage by flexibly compensating for the space when the secondary battery 110 swells. For example, the compression pad 130 may be made of a polyurethane material.

[0080] Here, in order to delay or prevent flame or heat from propagating between the secondary batteries 110 , the outer surface of the compression pad 130 may also be coated with a non-combustible material.

[0081] Here, when the compression pad 130 is provided in plurality, all of the plurality of compression pads 130 may be coated with the non-combustible material, or only some of the plurality of compression pads 130 may be coated with the non-combustible material. Furthermore, needless to say, the entire outer surface of the compression pad 130 may be coated with the non-combustible material, or only a portion of the outer surface may be coated with the non-combustible material.

[0082] Here, the non-combustible material may be any material as long as the non-combustible material can delay the propagation of flame or heat between the secondary batteries 110 as described above, and may include, for example, a ceramic material.

[0083] Furthermore, the non-combustible material may be applied to the compression pad 130 in a variety of ways. Figure 3b As shown, the non-combustible material may be sprayed onto the compression pad 130 by a spray device. In this case, Figure 4a As shown, a non-flammable coating 130 a may be formed on an outer surface of the compression pad 130 .

[0084] In addition, the non-combustible coating layer 130a may be applied to the compression pad 130 in various thicknesses, but it is preferred that the non-combustible coating layer 130a is formed on the outer surface of the compression pad 130 in a thickness of 0.01 mm to 1 mm.

[0085] This is because, when the thickness of the non-combustible coating 130a is less than 0.01 mm, the coating of the non-combustible material cannot be smoothly performed in the process, and an uncoated area may appear on the outer surface of the compression pad 130, and when the thickness exceeds 1 mm, the thickness of the non-combustible coating 130a becomes too thick, resulting in the side effect of separation from the outer surface of the compression pad 130.

[0086] The compression pad 130 may have various heights and widths.

[0087] In this case, it is preferable to form the compression pad 130 to have a height and a width greater than those of the adjacent secondary batteries 110 in order to delay or prevent the flame from propagating between the secondary batteries provided with the compression pad 130. Figure 4a to Figure 4b As shown, a height H2 of the compression pad 130 may be higher than a height H1 of the secondary battery 110 ( H2 > H1 ).

[0088] The compression pad 130 may be disposed between a plurality of secondary batteries 110, or between the secondary battery 110 and the housing 120. Here, the compression pad 130 may be disposed adjacent to the secondary battery 110 coated with the non-combustible material. In this case, the secondary battery 110 and the compression pad 130 may be disposed such that the surfaces coated with the non-combustible material are disposed to face each other, to effectively delay the spread of flame or heat between the secondary batteries.

[0089] The housing 120 is configured to accommodate a plurality of secondary batteries 110 and / or the compression pad 130 , and various configurations are possible.

[0090] Specifically, the housing 120 may have a structure in which a receiving space S is defined to receive a plurality of secondary batteries 110 and / or a compression pad 130. For example, the housing 120 may include a body 121 surrounding a portion of a surface of the secondary battery 110 and a cover portion 122 connected to the body 121 to cover the remaining surface of the secondary battery.

[0091] Here, the main body 121 may include Figure 5 The bottom of the XY plane (not shown) and the ends from the bottom in the upward direction ( Figure 5 In this case, the body 121 may be formed as a pair of side portions (not shown) extending in the Z direction in FIG. The shape is to surround a portion of the surface of the secondary battery 110 .

[0092] In addition, the cover portion 122 may be connected to the side portion and provided as The cover portion 122 may be provided at an upper side of the body 121 to cover a top surface of the secondary battery 110.

[0093] The surface of the body 121 not covered by the cover portion 122 may be covered by the end plate 123. For example, the end plate 123 may be provided at the bottom of the body 121 so as to be connected to the two ends on which the side surfaces are not formed, and Figure 6 As shown, the end plate 123 may be disposed on a region corresponding to the electrode lead 114 .

[0094] The outer case 120 having the above-described structure has at least one or more through holes P in at least one region so that gas generated by fire in the secondary battery 110 is discharged from the accommodation space S to the outside.

[0095] Here, in consideration of the density difference between the gas generated in the secondary battery 110 and the air, prevention of secondary damage due to gas discharge from the secondary battery, and easiness of a manufacturing process, at least one or more through holes P may be defined in the top surface of the outer case 120. That is, when the outer case 120 has a structure including the body 121 and the cover portion 122 as described above, at least one or more through holes P may be defined in the cover portion 122.

[0096] When the gas exhaust path passes through the electrode lead 114, considering the occurrence of impact such as sparks, it is preferable to define the formation direction of the through hole P at a position not overlapping the electrode lead 114. In this case, the through hole P may be defined at a position facing the battery case 111.

[0097] Even at this time, since the receiving portion 112 on the battery case 111 is a region for receiving the electrode assembly, as shown in FIG. Figure 7 As shown, it is more preferable that the through hole P is defined at a position facing the edge portion 113 to protect the electrode assembly from external influences. In this case, the through hole P may be defined at a position facing the width direction ( Figure 1 At the position of the edge portion 113 in the Z direction).

[0098] The present invention may include: a plurality of secondary batteries 110 arranged side by side in one direction; a housing 120 accommodating the plurality of secondary batteries 110; and at least one compression pad 130 disposed adjacent to the secondary batteries 110, and the compression pad 130 may provide a secondary battery module 100 having an outer surface coated with a non-combustible material.

[0099] Particularly, the compression pad 130 may be coated with a non-combustible material including ceramics, and the height of the compression pad 130 may be higher than that of the adjacent secondary battery 110. Also, at least one or more through holes P passing through the inside and the outside may be defined in at least one region of the housing 120.

[0100] Here, specific details related to the secondary battery 110, the housing 120, and the compression pad 130 may replace the above-described contents.

[0101] While embodiments of the present invention have been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0102] [Explanation of Reference Numerals]

[0103] 100: Secondary battery module 110: Secondary battery

[0104] 110a: Non-flammable coating 111: Battery housing

[0105] 112: Accommodating portion 113: Edge portion

[0106] 113a: first edge portion 113b: second edge portion

[0107] 114: electrode lead 115: insulating member

[0108] 120: Shell 121: Main body

[0109] 122: Cover part 123: End plate

[0110] 130: Compression pad 130a: Non-flammable coating

[0111] H1: Height of secondary battery H2: Height of compression pad

[0112] S: Accommodation space P: Through hole

Claims

1. A secondary battery module, comprising: a plurality of secondary batteries, the plurality of secondary batteries being arranged side by side along one direction; as well as a housing configured to accommodate the plurality of secondary batteries, Wherein, at least one of the plurality of secondary batteries comprises: an electrode assembly; and a battery case including a housing portion housing the electrode assembly and an edge portion connected from the housing portion, the battery case having an outer surface coated with a non-combustible material, Wherein, the thickness of the non-combustible material applied to the edge portion is greater than the thickness of the non-combustible material applied to the receiving portion.

2. The secondary battery module according to claim 1, wherein: The edge portion includes: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion, which is connected to the first edge portion and is folded at least once, wherein the non-combustible material is not applied to an end portion of the second edge portion.

3. The secondary battery module according to claim 1, wherein: The edge portion includes: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion, which is connected to the first edge portion and is folded at least once, Wherein, the thickness of the non-combustible material applied to the first edge portion is greater than the thickness of the non-combustible material applied to the second edge portion.

4. The secondary battery module according to claim 1, wherein: The non-combustible material is not applied to an electrode lead connected to the electrode assembly to protrude to the outside of the edge portion.

5. The secondary battery module according to claim 4, wherein: The non-combustible material is not applied to an insulating member configured to insulate the electrode lead from the edge portion.

6. The secondary battery module according to claim 1, further comprising at least one compression pad disposed adjacent to the secondary battery, in, An outer surface of the compression pad is coated with the non-combustible material.

7. The secondary battery module according to any one of claims 1 to 6, wherein: The non-combustible material includes ceramic.

8. The secondary battery module according to claim 6, wherein: A surface of the secondary battery coated with the non-combustible material and a surface of the compression pad coated with the non-combustible material are disposed to face each other.

9. The secondary battery module according to claim 6, wherein: The compression pad has a height higher than that of the secondary battery.

10. The secondary battery module according to claim 1, wherein: At least one or more through holes are defined in at least one region of the housing through the interior and the exterior.

11. The secondary battery module according to claim 10, wherein: The at least one or more through holes are defined in a top surface of the housing.

12. The secondary battery module according to claim 10, wherein: The housing comprises: a body configured to surround a portion of a surface of the secondary battery; and a cover portion connected to the body to cover the remaining surface of the secondary battery, Wherein, the at least one or more through holes are defined in the cover portion.

13. The secondary battery module according to claim 10, wherein: The through hole is defined in a position facing the battery case.

14. The secondary battery module according to claim 13, wherein: The through hole is defined in a position facing the edge portion.

15. A secondary battery, comprising: Electrode assembly; a battery case including a housing portion housing the electrode assembly and an edge portion connected from the housing portion, the battery case having an outer surface coated with a non-combustible material, Wherein, the thickness of the non-combustible material applied to the edge portion is greater than the thickness of the non-combustible material applied to the receiving portion.

16. The secondary battery according to claim 15, wherein The edge portion includes: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion, which is connected to the first edge portion and is folded at least once, wherein the non-combustible material is not applied to an end portion of the second edge portion.

17. The secondary battery according to claim 15, wherein The edge portion includes: a first edge portion from which an electrode lead connected to the electrode assembly protrudes; and a second edge portion, which is connected to the first edge portion and is folded at least once, Wherein, the thickness of the non-combustible material applied to the first edge portion is greater than the thickness of the non-combustible material applied to the second edge portion.

18. The secondary battery according to claim 15, wherein The non-combustible material is not applied to an electrode lead connected to the electrode assembly to protrude to the outside of the edge portion.

19. The secondary battery according to claim 18, wherein The non-combustible material does not coat an insulating member configured to insulate the electrode lead from the edge portion, and a portion of the insulating member protrudes to the outside of the edge portion.

20. The secondary battery according to any one of claims 15 to 19, wherein The non-combustible material includes ceramic.

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