Secondary battery module and secondary battery used therein

Abstract

The secondary battery module according to an embodiment of the present invention may include a plurality of secondary batteries arranged in parallel along one direction; and a housing that houses the plurality of secondary batteries. At least one of the plurality of secondary batteries may include an electrode assembly; and a battery case including a storage portion in which the electrode assembly is stored and a peripheral portion connected from the storage portion, the outer surface of which is coated with a non-combustible material. The thickness of the non-combustible material coated on the peripheral portion may be thicker than the thickness of the non-combustible material coated on the storage portion.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims the benefit of priority based on 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, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety.

[0002] 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 housing for accommodating the plurality of secondary batteries, and a secondary battery used therein.

Background Art

[0003] In recent years, secondary batteries have attracted attention as a power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), etc., which are proposed as solutions to problems such as air pollution caused by existing gasoline vehicles, diesel vehicles, etc. that use fossil fuels.

[0004]

[0005] ​As an example, the battery module may be composed of a plurality of secondary batteries, busbars (or metal plates) for connecting the secondary batteries in series and / or in parallel, a sensing assembly for voltage and temperature sensing, electrical components for charge and discharge control, and a housing for accommodating them. Among the secondary batteries currently in common use, one of the most spotlighted secondary batteries can be said to be the lithium secondary battery, and the lithium secondary battery can be classified into a can type and a pouch type according to the shape of the exterior material. Among these, the pouch type secondary battery is used in medium and large-sized battery modules because of its advantages of high energy density and easy lamination.

[0006] On the other hand, in recent years, as the demand for secondary battery modules installed in vehicles has increased, customers have been demanding to increase the energy density of secondary batteries in the limited space of secondary battery modules. In this case, there has been a problem that the safety risks related to the ignition and explosion of secondary batteries also increase accordingly.

[0007] That is, in order to ensure the safety of the vehicle driver when a secondary battery inside the secondary battery module catches fire, a technique is required 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 outside the housing.

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been devised to solve the above problems, and the 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.

Means for Solving the Problems

[0009] The secondary battery module according to an embodiment of the present invention may include a plurality of secondary batteries arranged in parallel along one direction; and a housing that houses the plurality of secondary batteries. At least one of the plurality of secondary batteries may include an electrode assembly; a housing portion that houses the electrode assembly; and a peripheral portion connected from the housing portion, and may include a battery case whose outer surface is coated with a non-combustible material. The thickness of the non-combustible material coated on the peripheral portion may be thicker than the thickness of the non-combustible material coated on the housing portion.

[0010] The peripheral portion may include a first peripheral portion from which an electrode lead connected to the electrode assembly protrudes; and a second peripheral portion connected to the first peripheral portion and folded at least once. The end portion of the second peripheral portion may not be coated with a non-combustible material.

[0011] The peripheral portion may include a first peripheral portion from which an electrode lead connected to the electrode assembly protrudes; and a second peripheral portion connected to the first peripheral portion and folded at least once. The thickness of the non-combustible material coated on the first peripheral portion may be thicker than the thickness of the non-combustible material coated on the second peripheral portion.

[0012] The electrode lead connected to the electrode assembly and protruding outside the peripheral portion may not be coated with a non-combustible material.

[0013] The insulating member that insulates the electrode lead and the peripheral portion may not be coated with a non-combustible material.

[0014] The secondary battery module may further include at least one compression pad disposed adjacent to the secondary battery, and the outer surface of the compression pad may be coated with a non-combustible material.

[0015] The non-combustible material may include ceramics.

[0016] The secondary battery and the compression pad may be arranged such that the surfaces coated with the non-combustible material face each other.

[0017] The height of the compression pad may be formed higher than the height of the adjacent secondary battery.

[0018] At least one or more through holes penetrating the inside and outside may be formed in at least one region of the housing.

[0019] At least one or more of the through holes may be formed on the upper surface of the housing.

[0020] The housing may include a main body surrounding a partial surface of the secondary battery; and a cover portion connected to the main body and covering the remaining surface of the secondary battery. At least one or more of the through holes may be formed in the cover portion.

[0021] The through hole may be formed at a position facing the battery case.

[0022] The through hole may be formed at a position facing the peripheral portion.

[0023] On the other hand, a secondary battery according to an embodiment of the present invention may include an electrode assembly; a storage portion in which the electrode assembly is stored; and a battery case including a peripheral portion connected to the storage portion and having an outer surface coated with a non-combustible material. The thickness of the non-combustible material coated on the peripheral portion may be thicker than the thickness of the non-combustible material coated on the storage portion.

[0024] The peripheral portion may include a first peripheral portion from which an electrode lead connected to the electrode assembly protrudes; and a second peripheral portion connected to the first peripheral portion and folded at least once. The end portion of the second peripheral portion may not be coated with a non-combustible material.

[0025] The peripheral portion may include a first peripheral portion from which an electrode lead connected to the electrode assembly protrudes; and a second peripheral portion connected to the first peripheral portion and folded at least once. The thickness of the incombustible material coated on the first peripheral portion may be greater than the thickness of the incombustible material coated on the second peripheral portion.

[0026] An incombustible material may not be applied to the electrode lead connected to the electrode assembly and protruding outside the peripheral portion.

[0027] An incombustible material may not be applied to the insulating member that insulates the electrode lead and the peripheral portion and partially protrudes outside the peripheral portion.

[0028] The incombustible material may include ceramics.

Advantages of the Invention

[0029] The present invention has the advantage that by coating at least one of a plurality of secondary batteries with an incombustible material and delaying the flame or heat propagation time between the secondary batteries, the safety of the secondary battery module can be improved.

[0030] Also, the present invention has the advantage that by coating the compression pad with an incombustible material and delaying the flame or heat propagation time between the secondary batteries, the safety of the secondary battery module can be improved.

[0031] Furthermore, the present invention has the advantage that by forming a through hole penetrating the inside and outside in at least one region of the housing, the gas inside the housing is discharged to the outside to prevent gas compression in the housing accommodation space, and by forming the formation position of the through hole at a position facing the battery case, particularly the peripheral portion, the spark risk of the electrode lead and the gas can be minimized.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3a

Figure 3b

Figure 4a

Figure 4b

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0033] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0034] In order to clearly explain the present invention, detailed descriptions of parts not related to the explanation or known technologies that may obscure the gist of the present invention are omitted. In this specification, when adding reference numerals to the components of each drawing, the same reference numerals are given to the same or similar components throughout the specification.

[0035] In addition, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary and dictionary meanings. In accordance with the principle that the inventor himself can appropriately define the concept of the terms in order to explain the invention in the best way, they must be construed in a meaning and concept that conforms to the technical idea of the present invention.

[0036] The present invention further includes a plurality of secondary batteries 110 arranged in parallel along one direction; and a housing 120 for housing the plurality of secondary batteries 110; at least one of the secondary batteries 110 provides a secondary battery module 100 whose outer surface is coated with a non-combustible material.

[0037] First, the secondary battery 110 is configured to be arranged in parallel along one direction inside the housing 120, and may include an electrode assembly (not shown); and a battery case 111 for housing the electrode assembly. The type of the electrode assembly is not limited. For example, the electrode assembly may have a structure of any one of a jelly roll type (winding type), a stack type (lamination type), or a composite type (stack / folding type).

[0038] The electrode assembly may be configured such that electrodes and a separator are alternately arranged. More specifically, the electrode assembly may be configured such that a positive electrode and a negative electrode are alternately arranged with a separator therebetween. Specifically, the electrode assembly may be laminated in the order of a positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector, and the positive electrode active material layer on one side of the separator may face the negative electrode active material layer on the other side.

[0039] On the other hand, in order to house the aforementioned electrode assembly, the battery case 111 may have a structure including a housing portion 112 in which the electrode assembly is housed, as shown in FIG. 1; and a peripheral portion 113 connected from the periphery of the housing portion 112.

[0040] More specifically, the battery case 111 may include a storage portion 112 formed by forming a region in a laminate sheet in which an inner resin layer / metal layer / outer resin layer are sequentially laminated from the inside to the outside, and a peripheral portion 113 connected from the periphery of the storage portion 112.

[0041] Here, PolyPropylene (PP) may be used for the inner resin layer, PolyEthylene Terephthalate (PET) may be used for the outer resin layer, and aluminum (Al) or the like may 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 the inner resin layer and the outer resin layer have insulating materials and the metal layer has a metal material, they may be used without special restrictions.

[0042] And the storage portion 112 may be understood as a region that is recessed and formed to have an empty space so that the electrode assembly can be stored on the battery case 111.

[0043] Also, the peripheral portion 113 may be understood as a region connected from the periphery of the storage portion 112 on the battery case 111. Such a peripheral portion 113 may have a sealed structure with a sealed periphery in order to prevent the electrode assembly stored in the storage portion 112 from being exposed to external moisture, air, etc. and being damaged.

[0044] Also, the peripheral portion 113 may include a first peripheral portion 113a from which an electrode lead 114 described later protrudes, and a second peripheral portion 113b connected to the first peripheral portion 113a and folded at least once. Preferably, the second peripheral portion 113b may be Double Side Folding (DSF).

[0045] For example, the first peripheral part 113a may be provided on both sides in the electrical equipment direction of the secondary battery 110, and the second peripheral part 113b may be provided on at least one side with respect to the entire width direction of the secondary battery 110.

[0046] On the other hand, the outer surface of the battery case 111 may be coated with a non-combustible material.

[0047] For example, the non-combustible material may include a ceramic material. In this case, there is an effect that it is possible to prevent a decrease in the insulation performance of the secondary battery 110 due to the exposure of the metal layer on the outer surface of the battery case 111.

[0048] That is, the metal layer may be exposed at the end of the peripheral part 113a due to the structure of the battery case 111. During the process of laminating an external resin layer on the metal layer during the manufacture of the battery case 111, through holes called pin holes may be formed in the external resin layer, and the metal layer may be exposed to the outside. At this time, by coating the exposed metal layer with the non-combustible material of the ceramic material, the metal layer can be insulated from the outside and the insulation performance of the secondary battery 110 can be improved.

[0049] However, if necessary, the non-combustible material may not be applied to the end 113c of the second peripheral part 113b. Therefore, when gas is generated due to abnormal high temperature or ignition in the secondary battery 110, the end of the second peripheral part 113b can be preferentially broken to induce the gas to be discharged. Thereby, it is possible to prevent the gas from being discharged at the first peripheral part 113a and the flame from spreading through the electrode lead 114.

[0050] On the other hand, the secondary battery 110 may include an electrode lead 114 protruding from the battery case 111. Further, the secondary battery 110 may further include an insulating member 115 that insulates the electrode lead 114 from the peripheral part 113 of the battery case 111, more specifically, the first peripheral part 113a.

[0051] Here, the electrode lead 114 may be understood as being configured to protrude from the battery case 111 and be electrically connected to the aforementioned electrode assembly. More specifically, one end of the electrode lead 114 may be connected to an electrode tab (not shown) formed on the electrode, and the other end may protrude outside the battery case, so that it may be connected to another secondary battery 110 or an external device.

[0052] The insulating member 115 may surround a part of the electrode lead 114. The insulating member 115 may be located between the peripheral edge portion 113 and the electrode lead 114. A part of the peripheral edge portion 113, more specifically, a part of the first peripheral 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 part of the insulating member 115 may protrude outside the peripheral edge portion 113.

[0053] The electrode lead 114 and additionally the insulating member 115 may not be coated with a non-combustible material.

[0054] On the other hand, in order to improve the energy density of the secondary battery module 100 in the accommodation space inside the housing 120, the secondary battery 110 as described above may be arranged in parallel along one direction as shown in FIG. 2. At this time, one direction may be understood as a direction parallel to the Y axis with reference to FIG. 2.

[0055] At this time, at least one of the secondary batteries 110 may have its outer surface coated with a non-combustible material in order to delay or prevent flame or heat propagation to adjacent other secondary batteries 110 even if ignition starts in one secondary battery 110.

[0056] In this case, all of the secondary batteries 110 arranged in one direction may be coated with a non-combustible material, or only a part of the secondary batteries 110 arranged in one direction may be coated with a non-combustible material. Also, it goes without saying that the entire outer surface of the secondary battery 110 may be coated with a non-combustible material, or only a part of the outer surface may be coated with a non-combustible material.

[0057] Here, the non-combustible material can be any material as long as it can delay the flame or heat propagation between adjacent secondary batteries 110, and for example, it may include a ceramic material.

[0058] And the non-combustible material may be coated on the secondary battery 110 in various ways. For example, as shown in Fig. 3a, the non-combustible material may be spray-coated on the secondary battery 110 by a spraying device. In this case, as shown in Fig. 4a, a non-combustible coating layer 110a may be formed on the outer surface of the secondary battery 110.

[0059] As shown in Fig. 3a, during the process of spray-coating the secondary battery 110, a support member (not shown) such as a gripper may grip the electrode lead 114 and / or the insulating member 115 to support the secondary battery 110. Thereby, the non-combustible material can be coated on the battery case 111 entirely without interfering with the support member. Also, it is possible to prevent the electrode lead 114 from being coated with the non-combustible material without a separate masking member.

[0060] Also, the non-combustible coating layer 110a may be coated on the secondary battery 110 with various thicknesses, but in some cases, it is preferable that the non-combustible coating layer 110a is formed to be 0.01 mm to 1 mm on the outer surface of the secondary battery 110.

[0061] This is because when the non-combustible coating layer 110a is less than 0.01 mm, the coating of the non-combustible material may not be performed smoothly during the process, so there may be a region that is not coated on the outer surface of the secondary battery 110. When it exceeds 1 mm, there may be a side effect that the thickness of the non-combustible coating layer 110a becomes very thick and separates from the outer surface of the secondary battery 110.

[0062] The thickness of the incombustible coating layer 110a on the peripheral portion 113 may be greater than the thickness of the incombustible coating layer 110a on the storage portion 112. That is, the thickness of the incombustible material coated on the peripheral portion 113 may be greater than the thickness of the incombustible material coated on the storage portion 112. Since the peripheral portion 113 having a sealing structure is more vulnerable to breakage than the storage portion 112, there is a risk that flames may be preferentially released or penetrate at the peripheral portion 113. In order to prevent such a risk, by forming a thick incombustible coating layer 110a on the peripheral portion 113, the destruction of the seal can be delayed and the propagation of the flame can be delayed.

[0063] Also, the thickness of the incombustible coating layer 110a on the first peripheral portion 113a may be greater than the thickness of the incombustible coating layer 110a on the second peripheral portion 113b. That is, the thickness of the incombustible material coated on the first peripheral portion 113a may be greater than the thickness of the incombustible material coated on the second peripheral portion 113b. The first peripheral portion 113a where the electrode lead 114 protrudes is vulnerable to the propagation of flames, and there is a risk that the sealing strength may be relatively reduced compared to the second peripheral portion 113b that is folded at least once. In order to prevent such a risk, by forming a thicker incombustible coating layer 110a on the first peripheral portion 113a, the destruction of the seal can be delayed and the propagation of the flame can be delayed.

[0064] On the other hand, the secondary battery module 100 may further include at least one compression pad 130 disposed adjacent to the secondary battery 110.

[0065] Here, the compression pad 130 is configured to be disposed adjacent to the secondary battery 110 inside the accommodation space (S) of the housing 120, and various configurations are possible.

[0066] Specifically, the compression pad 130 may be made of a deformable material that can flexibly compensate for space when swelling occurs in the secondary battery 110 to prevent damage to the module. For example, it may have a polyurethane material.

[0067] At this time, in order to delay or prevent the flame or heat propagation between the compression pad 130 and the secondary battery 110, the outer surface may be coated with a non-combustible material.

[0068] Here, when the compression pads 130 are configured in plurality, any of the plurality of compression pads 130 may be coated with a non-combustible material, or only some of the plurality of compression pads 130 may be coated with a non-combustible material. Also, it goes without saying that the entire outer surface of the compression pad 130 may be coated with a non-combustible material, or only a part of the outer surface may be coated with a non-combustible material.

[0069] Here, as long as the non-combustible material is a material that can delay the flame or heat propagation between the secondary batteries 110 as described above, any material is possible, and for example, it may include a ceramic material.

[0070] And the non-combustible material may be coated on the compression pad 130 in various ways. For example, as shown in FIG. 3b, the non-combustible material may be spray-coated on the compression pad 130 by an injection device. In this case, as shown in FIG. 4b, a non-combustible coating layer 130a may be formed on the outer surface of the compression pad 130.

[0071] Also, the non-combustible coating layer 130a may be coated on the compression pad 130 to various thicknesses, but the non-combustible coating layer 130a may preferably be formed to be 0.01 mm to 1 mm on the outer surface of the compression pad 130.

[0072] This is because when the non-combustible coating layer 130a is less than 0.01 mm, the coating of the non-combustible material in the process may not be smoothly performed, so there may be a region that is not coated on the outer surface of the compression pad 130. When it exceeds 1 mm, the thickness of the non-combustible coating layer 130a becomes very thick, and there may be a side effect of separating from the outer surface of the compression pad 130.

[0073] On the one hand, the compression pad 130 may have various heights and widths.

[0074] In this case, the height and width of the compression pad 130 may preferably be formed higher than the height and width of the adjacent secondary batteries 110 so as to delay or prevent the propagation of flames between the secondary batteries 110 disposed with the compression pad 130 interposed therebetween. For example, the height (H2) of the compression pad 130 may be formed higher than the height (H1) of the secondary battery 110 as shown in FIGS. 4a to 4b (H2 > H1).

[0075] Such a compression pad 130 may be disposed between a plurality of secondary batteries 110 or may be disposed between the secondary battery 110 and the housing 120. At this time, the compression pad 130 may be disposed adjacent to the secondary battery 110 coated with a 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 face each other in order to effectively delay the propagation of flames or heat between the secondary batteries 110.

[0076] On the other hand, the housing 120 is configured to accommodate the plurality of secondary batteries 110 and / or compression pads 130, and various configurations are possible.

[0077] Specifically, the housing 120 may have a structure in which an accommodation space (S) is formed inside so as to accommodate the plurality of secondary batteries 110 and / or compression pads 130. For example, the housing 120 may include a main body 121 surrounding a part of the surface of the secondary battery 110; and a cover part 122 connected to the main body 121 and covering the remaining surface of the secondary battery 110.

[0078] Here, the main body 121 may include a bottom portion (not shown) parallel to the X-Y plane with reference to FIG. 5; and a pair of side portions (not shown) extending upward (in the Z direction with reference to FIG. 5) from both ends of the bottom portion. In this case, the main body 121 may be formed in a "C" shape and have a structure that surrounds a partial surface of the secondary battery 110.

[0079] And the cover portion 122 may be connected to the side portion and provided in the open portion of the "C" shape to cover the remaining surface of the secondary battery 110. For example, the cover portion 122 may be provided above the main body 121 and be provided to cover the upper surface of the secondary battery 110.

[0080] On the other hand, the surface of the main 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 to be connected to both ends of the bottom portion of the main body 121 where the side portions are not formed, and may be arranged in a region corresponding to the electrode lead 114 of the secondary battery 110 as shown in FIG. 6.

[0081] The housing 120 of the above structure may have at least one or more through holes (P) penetrating the inside and outside in at least one region so that gas generated by ignition or the like in the secondary battery 110 is discharged from the accommodation space (S) to the outside.

[0082] At this time, the through holes (P) may be formed in at least one or more on the upper surface of the housing 120 in consideration of the density difference between the gas generated from the secondary battery 110 and air, prevention of secondary damage due to gas discharge of the secondary battery 110, and ease during the manufacturing stage. That is, when the housing 120 has a structure including the main body 121 and the cover portion 122 as described above, the through holes (P) may be formed in at least one or more on the cover portion 122.

[0083] On the one hand, when the gas discharge path passes through the electrode lead 114, the formation direction of the through hole (P) is preferably formed at a position that does not overlap with the electrode lead 114 in consideration of the possibility of generating an impact such as a spark. In this case, the through hole (P) may be formed at a position facing the battery case 111.

[0084] Also at this time, on the battery case 111, since the storage portion 112 is an area where the electrode assembly is stored, in order to protect the electrode assembly from the outside, the through hole (P) is more preferably formed at a position facing the peripheral portion 113 as shown in FIG. 7. In this case, the through hole (P) may be formed at a position facing the peripheral portion 113 located in the width direction (Z direction in FIG. 1) of the secondary battery 110.

[0085] On the other hand, the present invention includes a plurality of secondary batteries 110 arranged in parallel along one direction; a housing 120 that houses the plurality of secondary batteries 110; and at least one compression pad 130 disposed adjacent to the secondary battery 110. The compression pad 130 may provide a secondary battery module 100 whose outer surface is coated with a non-combustible material.

[0086] In particular, the compression pad 130 may be coated with a non-combustible material including ceramics, and the height of the compression pad 130 may be formed higher than the height of the adjacent secondary battery 110. And the housing 120 may have at least one or more through holes (P) penetrating the inside and outside in at least one region.

[0087] Here, the specific contents regarding the secondary battery 110, the housing 120, and the compression pad 130 may be replaced with the foregoing contents.

[0088] As described above, the present invention has been described by limited embodiments and drawings, but the present invention is not limited thereby, and various implementations are possible within the equivalent scope of the technical idea of the present invention and the claims described below by those having ordinary knowledge in the technical field to which the present invention pertains.

Description of Symbols

[0089] 100 Secondary battery module 110 Secondary battery 110a Incombustible coating layer 111 Battery case 112 Storage part 113 Peripheral part 113a First peripheral part 113b Second peripheral part 114 Electrode lead 115 Insulating member 120 Housing 121 Main body 122 Cover part 123 End plate 130 Compression pad 130a Incombustible coating layer H1 Height of the secondary battery H2 Height of the compression pad S Accommodation space P Through hole

Claims

1. A plurality of secondary batteries arranged in parallel along one direction, and a housing for accommodating the plurality of secondary batteries, wherein at least one of the plurality of secondary batteries includes an electrode assembly, a battery case including a storage portion for storing the electrode assembly and a peripheral portion connected to the storage portion, and having an outer surface coated with a non-combustible material, A secondary battery module in which the thickness of the non-combustible material coated on the peripheral portion is thicker than the thickness of the non-combustible material coated on the storage portion.

2. The peripheral portion includes a first peripheral portion where an electrode lead connected to the electrode assembly protrudes, and a second peripheral portion connected to the first peripheral portion and folded at least once, The secondary battery module according to claim 1, wherein the end portion of the second peripheral portion is not coated with a non-combustible material.

3. The peripheral portion includes a first peripheral portion where an electrode lead connected to the electrode assembly protrudes, and a second peripheral portion connected to the first peripheral portion and folded at least once, The secondary battery module according to claim 1, wherein the thickness of the non-combustible material coated on the first peripheral portion is thicker than the thickness of the non-combustible material coated on the second peripheral portion.

4. The secondary battery module according to claim 1, wherein the electrode lead connected to the electrode assembly and protruding outside the peripheral portion is not coated with a non-combustible material.

5. The secondary battery module according to claim 4, wherein the insulating member for insulating the electrode lead and the peripheral portion is not coated with a non-combustible material.

6. Further including at least one compression pad arranged adjacent to the secondary battery, The secondary battery module according to claim 1, wherein the outer surface of the compression pad is coated with a non-combustible material.

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

8. The secondary battery module according to claim 6, wherein the secondary battery and the compression pad are arranged such that the surfaces coated with the non-combustible material face each other.

9. The secondary battery module according to claim 6, wherein the height of the compression pad is formed higher than the height of the adjacent secondary battery.

10. The housing The secondary battery module according to claim 1, wherein at least one through hole penetrating the inside and outside is formed in at least one region.

11. The through hole is formed in at least one or more on the upper surface of the housing, and the secondary battery module according to claim 10.

12. The housing a main body surrounding a part of the secondary battery, and a cover portion connected to the main body to cover the remaining surface of the secondary battery, and the secondary battery module according to claim 10, wherein the through hole is formed in at least one or more in the cover portion. The through hole is formed in at least one or more in the cover portion, and the secondary battery module according to claim 10.

13. The through hole is formed at a position facing the battery case, and the secondary battery module according to claim 10.

14. The through hole is formed at a position facing the peripheral portion, and the secondary battery module according to claim 13.

15. an electrode assembly, a storage portion in which the electrode assembly is stored, and a battery case including a peripheral portion connected from the storage portion and having an outer surface coated with a non-combustible material, and the thickness of the non-combustible material coated on the peripheral portion is thicker than the thickness of the non-combustible material coated on the storage portion.

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

17. The peripheral portion includes a first peripheral portion from which an electrode lead connected to the electrode assembly protrudes, and a second peripheral portion connected to the first peripheral portion and folded at least once, and the thickness of the non-combustible material coated on the first peripheral portion is thicker than the thickness of the non-combustible material coated on the second peripheral portion, and the secondary battery according to claim 15.

18. The electrode lead connected to the electrode assembly and protruding outside the peripheral portion is not coated with a non-combustible material, and the secondary battery according to claim 15.

19. The insulating member that insulates the electrode lead and the peripheral portion and has a part protruding outside the peripheral portion is not coated with a non-combustible material, and the secondary battery according to claim 18.

20. The non-combustible material includes ceramics, and the secondary battery according to any one of claims 15 to 19. ​ ​ ​

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