battery module

Abstract

A battery module according to one embodiment of the present invention may include: a plurality of secondary battery cells; a housing component that internally accommodates the plurality of secondary battery cells; and a multilayer component that is disposed between the plurality of secondary battery cells and at least a portion in a thickness direction of which is formed of a material having lower thermal conductivity than other portions.

Description

Technical Field

[0001] The present invention relates to a battery module. Background Art

[0002] With the technological development and growing demand for mobile devices, electric vehicles, and other devices, the demand for secondary batteries as energy sources is rapidly increasing. Secondary batteries are batteries that can be repeatedly charged and discharged because the conversion between chemical energy and electrical energy is reversible.

[0003] Such a secondary battery cell includes an electrode assembly, which is a main component of the secondary battery, including a positive electrode, a negative electrode, a separator, and an electrolyte, and a battery cell main body component, which is a multi-layered outer material (laminated film case) that protects the electrode assembly.

[0004] In addition, a plurality of the secondary battery cells may be mounted to be installed as a battery module in an electric vehicle or the like.

[0005] However, such an electrode assembly generates heat during charging and discharging, and the temperature increase caused by such heat generation may degrade the performance of the secondary battery cell.

[0006] In addition, a problem may occur in which any one of the secondary battery cells explodes due to an internal factor of the battery module such as a temperature increase of the secondary battery, or explodes due to an external impact.

[0007] Furthermore, the explosion of any one secondary battery cell will cause high temperature and high pressure to other surrounding secondary battery cells, which may lead to a chain explosion of the secondary battery cells.

[0008] Therefore, in order to improve the above problems or limitations, research on battery modules is needed. Summary of the Invention

[0009] (1) Technical issues to be resolved

[0010] An object of the present invention is to provide a battery module that can prevent the problem of heat from any one secondary battery cell being transferred to other secondary battery cells.

[0011] On the other hand, an object of the present invention is to provide a battery module that improves the problem of a fire caused by the explosion of any one secondary battery cell causing a chain explosion of other secondary battery cells.

[0012] (2) Technical solution

[0013] A battery module according to one embodiment of the present invention may include: a plurality of secondary battery cells; a housing component that internally accommodates the plurality of secondary battery cells; and a multilayer component that is disposed between the plurality of secondary battery cells and at least a portion in a thickness direction of which is formed of a material having lower thermal conductivity than other portions.

[0014] Specifically, the multi-layer component of the battery module according to one embodiment of the present invention may include: a fire-resistant portion, which forms an outer layer adjacent to the secondary battery cell; and a heat transfer prevention portion, which is arranged to be connected to the fire-resistant portion on both sides to form an inner layer, and is formed of a material having a lower thermal conductivity than the fire-resistant portion.

[0015] The heat transfer preventing portion of the battery module according to one embodiment of the present invention may be formed of a material having a thermal conductivity of 0.3 W / (m·K) or less.

[0016] In addition, the heat transfer preventing portion of the battery module according to one embodiment of the present invention may be formed of a material including at least one of a polymer material, an inorganic material, and a ceramic material.

[0017] In addition, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed of a material having higher fire resistance than that of the heat-transfer preventing portion.

[0018] In addition, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed of a material having a melting point higher than 1000°C.

[0019] In addition, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed of a material that maintains a shape at least at 1000°C.

[0020] In addition, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed to have a thickness greater than 0.01 mm.

[0021] Furthermore, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed to have a thickness smaller than that of the heat-transfer preventing portion in the entire region adjoining the secondary battery cell.

[0022] Furthermore, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed to have a thickness smaller than that of the heat transfer preventing portion in a central portion of a region adjoining the secondary battery cell.

[0023] Furthermore, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed to have a thickness greater than that of the heat transfer preventing portion in an outer portion of a region adjoining the secondary battery cell.

[0024] Furthermore, the fire-resistant portion of the battery module according to one embodiment of the present invention may be formed to have a thickness gradually smaller than that of the heat transfer preventing portion from an outer portion of a region contacting the secondary battery cell toward a central portion.

[0025] In addition, the multi-layer component of the battery module according to one embodiment of the present invention may include: a heat transfer prevention portion, which forms an outer layer adjacent to the secondary battery cell; and a fire-resistant portion, which is arranged so that its two sides are in contact with the heat transfer prevention portion to form an inner layer, and the heat transfer prevention portion may be formed of a material with a lower thermal conductivity than the fire-resistant portion.

[0026] In addition, the multi-layer component of the battery module according to one embodiment of the present invention may include: a heat transfer prevention portion, which forms an outer layer adjacent to the secondary battery cell; and a core buffer portion, which is arranged so that its two side surfaces are in contact with the heat transfer prevention portion to form an inner layer, and is elastically deformed and compressed when the secondary battery cell expands. The heat transfer prevention portion may be formed of a material having a lower thermal conductivity than the core buffer portion.

[0027] In addition, the heat transfer preventing portion of the battery module according to one embodiment of the present invention may be fixed to the secondary battery cell by an adhesive or a tape.

[0028] (3) Beneficial effects

[0029] The battery module of the present invention can prevent the problem of heat from any one secondary battery cell being transferred to other secondary battery cells.

[0030] On the other hand, the battery module of the present invention can improve the problem that the flame caused by the explosion of any one secondary battery cell may cause a chain explosion of other secondary battery cells.

[0031] However, the various advantages and effects of the present invention are not limited to the above contents, and the various advantages and effects of the present invention can be more easily understood in the process of describing the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an exploded perspective view showing the battery module of the present invention.

[0033] Figure 2 This is a front view showing the battery module of the present invention.

[0034] Figure 3 This is a front view showing an embodiment in which the thickness of the fire-resistant portion is adjusted at the center portion in the battery module of the present invention.

[0035] Figure 4 This is a front view showing an embodiment in which the thickness of the fire-resistant portion is adjusted on the outer side of the battery module of the present invention.

[0036] Figure 5 This is a front view showing an embodiment in which the thickness of the fire-resistant portion is adjusted to gradually change from the center portion toward the outer portion in the battery module of the present invention.

[0037] Figure 6 This is a front view showing an embodiment in which the outer layer is formed by the heat transfer preventing portion and the inner layer is formed by the fire-resistant portion in the battery module of the present invention.

[0038] Figure 7 This is a front view showing an embodiment in which the outer layer is formed by the heat transfer prevention portion and the inner layer is formed by the core buffer portion in the battery module of the present invention.

[0039] Figure 8 It is a front view showing an embodiment in which a heat transfer preventing portion forming an outer layer in a battery module of the present invention is fixed to a secondary battery cell by an adhesive or a tape.

[0040] Figure 9 This is a photograph showing a state in which the refractory portion of the present invention is not perforated in a high-temperature test.

[0041] Figure 10 This is a graph showing temperature changes of the fire-resistant portion and the heat transfer prevention portion of the present invention in a high-temperature test. DETAILED DESCRIPTION

[0042] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more fully illustrate the present invention to those skilled in the art. In the accompanying drawings, the shapes and sizes of components may be exaggerated to provide a clearer description.

[0043] In addition, unless clearly defined otherwise in the context, a singular expression in the present specification includes a plural expression, and the same reference numerals or reference numerals assigned in a similar manner throughout the specification denote the same component or corresponding components.

[0044] The present invention relates to a battery module that can prevent the heat of any one secondary battery cell 10 from being transferred to other secondary battery cells 10 and, on the other hand, can improve the problem of a fire caused by the explosion of any one secondary battery cell 10 causing a chain explosion of other secondary battery cells 10 .

[0045] That is, the battery module of the present invention may be configured such that the multilayer member 30 disposed between adjacent secondary battery cells 10 can function as a shield so that at least one of heat and flame generated in any one secondary battery cell 10 does not spread to other surrounding secondary battery cells 10 .

[0046] Therefore, a heat transfer problem or an explosion propagation problem in any one of the secondary battery cells 10 can be prevented.

[0047] Specifically, referring to the accompanying drawings, Figure 1 It is an exploded stereoscopic diagram showing a battery module of the present invention. According to the accompanying drawings, a battery module according to an embodiment of the present invention may include: a plurality of secondary battery cells 10; a shell component 20, which accommodates a plurality of the secondary battery cells 10 inside; and a multilayer component 30, which is arranged between the plurality of the secondary battery cells 10, and at least a portion in the thickness direction (X) is formed of a material with a lower thermal conductivity than other portions.

[0048] As described above, the battery module of the present invention has the multilayer member 30 disposed between the plurality of secondary battery cells 10 , thereby preventing at least one of heat and flame generated in any one secondary battery cell 10 from propagating to other surrounding secondary battery cells 10 .

[0049] Here, the secondary battery cell 10 may include an electrode assembly and a battery cell body part covering the electrode assembly.

[0050] The electrode assembly substrate includes an electrolyte and is contained within the battery cell main body for use. The electrolyte may contain a lithium salt such as LiPF6 or LiBF4 in an organic solvent such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), or dimethyl carbonate (DMC). Furthermore, the electrolyte may be in a liquid, solid, or gel form.

[0051] The battery cell main body is a structure that protects the electrode assembly and contains the electrolyte. For example, the battery cell main body can be configured as a bag-type component or a can-type component. The bag-type component is configured to seal and contain the electrode assembly on three sides and is generally configured to fold, join, and seal the three sides (excluding one side, which serves as the lower portion) while the electrode assembly is contained therein. Furthermore, the can-type component is configured to seal and contain the electrode assembly on one side and is generally configured to fold, join, and seal the three sides (excluding one side, which serves as the lower portion) while the electrode assembly is contained therein.

[0052] However, such pouch-type secondary battery cell 10 and can-type secondary battery cell 10 are merely one example of the secondary battery cell 10 accommodated in the battery module of the present invention, and the secondary battery cell 10 accommodated in the battery module of the present invention is not limited to such types.

[0053] The housing member 20 serves as a main body of a battery module that accommodates a plurality of the secondary battery cells 10 .

[0054] That is, the housing member 20 serves as a structure for accommodating a plurality of secondary batteries, and plays a role in protecting the secondary batteries while transmitting electric energy generated by the secondary batteries to the outside or transmitting electric energy from the outside to the secondary batteries.

[0055] To this end, the housing member 20 may include a bottom member 21 and a side wall member 22 for accommodating the plurality of secondary battery cells 10 .

[0056] That is, the housing member 20 may include a bottom member 21 on which the secondary battery cell 10 is mounted, and a side wall member 22 provided at an edge of the bottom member 21 .

[0057] The plurality of secondary battery cells 10 are mounted on the bottom member 21 , and the bottom member plays a role in supporting the plurality of secondary battery cells 10 mounted as described above.

[0058] Here, the bottom member 21 may be configured to cool the secondary battery cell 10 by transferring heat generated in the secondary battery cell 10 to an external heat sink.

[0059] Furthermore, the side wall members 22 forming the side portions of the case member 20 can also discharge heat generated in the secondary battery cells 10 to the outside.

[0060] The housing 20 may include a cover 23 disposed on the upper end of the side wall 22 to protect the upper end of the secondary battery. Furthermore, the housing 20 may include a front member 26 and a rear member 27 adjacent to the side wall 22, thereby being configured to enclose the plurality of secondary battery cells 10.

[0061] In addition, the housing member 20 may further include additional structures such as a bus bar member 25 for electrically connecting the secondary battery to the outside.

[0062] In addition, a compression member 24 may be further provided on the inner side of the side wall member 22 to more firmly protect the secondary battery 10 .

[0063] The multi-layer member 30 plays a role in preventing at least one of heat and flame generated in any one of the secondary battery cells 10 from propagating to other surrounding secondary battery cells 10 .

[0064] To this end, the multilayer part 30 may be provided between the adjacent secondary battery cells 10. In addition, the multilayer part 30 is provided to form a plurality of layers, and at least a portion of the multilayer part 30 may be formed of a material having lower thermal conductivity than other portions.

[0065] That is, the multilayer member 30 is formed so that at least a portion thereof has lower thermal conductivity than other portions, thereby preventing the transfer of heat generated in any one of the secondary battery cells 10 .

[0066] Specifically, the multilayer component 30 may include a fire-resistant portion 31 and a heat transfer preventing portion 32 to be formed into multiple layers in the thickness direction (X). Detailed description of this will be referred to later. Figures 2 to 10 Provide a description.

[0067] Figure 2 3 is a main view of the battery module of the present invention. Referring to the accompanying drawings, the multi-layer component 30 of the battery module according to one embodiment of the present invention may include: a fire-resistant portion 31, which forms an outer layer adjacent to the secondary battery cell 10; and a heat transfer prevention portion 32, which is arranged to be connected to the fire-resistant portion 31 on both sides to form an inner layer, and is formed of a material having a lower thermal conductivity than the fire-resistant portion 31.

[0068] That is, the multilayer member 30 may include the fire-resistant portion 31 and the heat transfer preventing portion 32 having lower thermal conductivity than the fire-resistant portion 31 , so as to prevent the transfer of heat generated in any one of the secondary battery cells 10 by forming at least a portion having lower thermal conductivity than other portions.

[0069] Here, the multi-layer member 30 may have the heat transfer preventing portion 32 formed at a central portion in the thickness direction (X), and may have the fire-resistant portion 31 formed at an outer portion in the thickness direction (X).

[0070] In addition, the formation ratios of the fire-resistant portion 31 and the heat transfer preventing portion 32 in the thickness direction (X) of the multilayer component 30 can be formed to be different from each other in the height direction (Y) of the multilayer component 30, thereby more effectively ensuring durability and preventing heat transfer. Figures 3 to 5 Provide a description.

[0071] In the thickness direction (X) of the multi-layer member 30 , the fire-resistant portion 31 is provided on the outer side of the heat transfer preventing portion 32 to form an outer layer.

[0072] Furthermore, the fire-resistant portion 31 is configured not to be melted or burned by the heat and flame generated in any of the secondary battery cells 10 , thereby serving to improve the durability of the multi-layer component 30 .

[0073] In other words, the heat transfer prevention portion 32 may be formed to have a lower thermal conductivity than the refractory portion 31 to prevent heat transfer, but may be melted or burned by heat or flame, and the refractory portion 31 may be configured to compensate for this.

[0074] To this end, the fire-resistant portion 31 of the battery module according to one embodiment of the present invention may be formed of a material having higher fire resistance than that of the heat transfer preventing portion 32 .

[0075] Specifically, when heat or flames are generated due to heat generation or explosion in the adjacent secondary battery cell 10, the fire-resistant portion 31 forming the outer layer of the multilayer component 30 is directly exposed to the heat or flames. Therefore, to prevent the heat transfer prevention portion 32 from melting or burning due to heat and flames, the fire-resistant portion 31 is formed of a material having a higher fire resistance than the heat transfer prevention portion 32.

[0076] For example, the fire-resistant portion 31 of the battery module according to one embodiment of the present invention may be formed of a material having a melting point higher than 1000°C.

[0077] Therefore, when heat is generated in the adjacent secondary battery cell 10 due to heat generation or explosion, and the temperature reaches 1000° C. or lower, the fire-resistant portion 31 does not melt. Therefore, the durability of the multilayer component 30 can be ensured.

[0078] For example, the refractory portion 31 may be formed of a material such as iron (Fe) or copper (Cu) having a melting point higher than 1000° C., thereby ensuring durability of the multilayer component 30. Furthermore, the refractory portion 31 may be formed of an inorganic material such as ceramic to ensure durability against heat or flame.

[0079] In addition, as an example, the fire-resistant portion 31 of the battery module according to one embodiment of the present invention may be formed of a material that maintains a shape at least at 1000°C.

[0080] Due to the aforementioned material, the fire-resistant portion 31 maintains its shape even when heat is generated by heating or explosion in the adjacent secondary battery cell 10, reaching a temperature of 1000° C. or less. Therefore, the multilayer component 30 prevents or delays the direct transfer of heat, gas, and the like to the surrounding secondary battery cells 10.

[0081] In this case, as an example, the refractory portion 31 can be formed of a material such as iron (Fe), copper (Cu), aluminum (Al) without additional treatment, or can be formed by coating the outer surface of a metal material such as iron (Fe), copper (Cu), aluminum (Al) with a material that is conducive to maintaining the shape or performing heat treatment on the surface thereof.

[0082] In addition, the fire-resistant portion 31 of the battery module according to one embodiment of the present invention may be formed to have a thickness greater than 0.01 mm.

[0083] When the refractory portion 31 is formed with the thickness as described above, the refractory portion 31 can maintain its shape without being perforated even when a flame of at least 1000° C. is applied. Figure 9 photos to confirm. That is, Figure 9 This is a photograph showing a state in which the refractory portion 31 of the present invention is not perforated during a high-temperature test, and the technical significance of limiting the thickness of the refractory portion 31 can be confirmed.

[0084] Here, the high temperature test was performed by applying flame to a specific point in front of the refractory portion 31 using a torch. In addition, in the high temperature test, the refractory portion 31 was formed of an iron alloy material (SUS 304) having a melting point of approximately 1400°C, and the heat transfer prevention portion 32 was formed of a mica sheet. The thickness of the refractory portion 31 was formed to be 0.01 mm or 0.5 mm. The results of the high temperature test as described above are summarized in Figure 9 Photos, Figure 10 The temperature change curve is shown in the following table 1.

[0085] [Table 1]

[0086]

[0087] The high-temperature test confirmed that the fire-resistant portion 31 has a partial heat transfer prevention effect as the thickness increases. In addition, the fire-resistant portion 31 of the battery module according to one embodiment of the present invention can be formed to have a thickness smaller than that of the heat transfer prevention portion 32 in the entire area in contact with the secondary battery cell 10.

[0088] As described above, when the fire-resistant portion 31 is formed to be thinner than the heat transfer preventing portion 32 , the heat transfer preventing portion 32 may be formed to be relatively thicker in a limited interval between the secondary battery cells 10 adjacent to each other.

[0089] Here, since the heat transfer preventing portion 32 is formed to be relatively thick, the effect of blocking the transfer of heat generated in any one of the secondary battery cells 10 can be further enhanced.

[0090] That is, the amount of heat transfer is inversely proportional to the distance. Since the heat transfer prevention portion 32 having a lower thermal conductivity than the refractory portion 31 is formed relatively more, the heat transfer distance is increased.

[0091] Therefore, the heat transfer effect can be improved in the entire region where the multi-layer member 30 contacts the secondary battery cell 10 .

[0092] The heat transfer preventing portion 32 is provided inside the fire-resistant portion 31 in the thickness direction (X) of the multi-layer member 30 to form a core layer.

[0093] Furthermore, the heat transfer preventing portion 32 may be provided to improve a problem in which heat generated in any one of the secondary battery cells 10 is transferred to other surrounding secondary battery cells 10 .

[0094] To this end, the heat transfer preventing portion 32 may be configured to have a lower thermal conductivity than the fire-resistant portion 31 .

[0095] For example, the heat transfer preventing portion 32 of the battery module according to one embodiment of the present invention may be formed of a material having a thermal conductivity of 0.3 W / (m·K) or less.

[0096] As described above, the heat transfer preventing portion 32 has a thermal conductivity of 0.3 W / (m·K) or less, thereby improving the problem of heat generated in any one of the secondary battery cells 10 being transferred to other surrounding secondary battery cells 10 .

[0097] More preferably, the heat transfer preventing portion 32 may have a thermal conductivity of less than or equal to 0.03 W / (m·K) to further improve the effect of improving the heat transfer problem.

[0098] Since the fire-resistant portion 31 is provided on the outer surface of the heat transfer prevention portion 32, the material can be selected based solely on the physical property of thermal conductivity. In other words, since the material of the heat transfer prevention portion 32 can be selected without the durability issue of melting or burning due to heat or flames, the range of material choices can be further expanded.

[0099] For example, the heat transfer preventing portion 32 of the battery module according to one embodiment of the present invention may be formed of a material including at least one of a polymer material, an inorganic material, and a ceramic material.

[0100] Here, the polymer material may include materials such as silicon-based materials. In addition, the inorganic material is a material that does not contain carbon (C), and may include silicon compounds such as mica, lime, salt, glass, and some metals such as iron. The ceramic material may include materials composed of oxides, carbides, and nitrides formed by combining metal elements such as silicon (Si), aluminum (Al), titanium (Ti), and zirconium (Zr) with oxygen, carbon, and nitrogen. As an example, these ceramic materials can be made using natural raw materials such as clay, kaolin, feldspar, and silica, or they can be made using synthetic raw materials such as silicon carbide, silicon nitride, alumina, zirconium oxide, and barium titanate.

[0101] As described above, since the heat transfer prevention portion 32 is formed of a polymer material, an inorganic material, or a ceramic material having a lower thermal conductivity than the fire-resistant portion 31 , the multilayer component 30 can act as a shield so that the heat generated in any one secondary battery cell 10 does not spread to other secondary battery cells 10 around it.

[0102] Figure 3 It is a main view showing an embodiment of adjusting the thickness of the fire-resistant portion 31 in the center portion of the battery module of the present invention. Referring to the accompanying drawings, the fire-resistant portion 31 of the battery module according to an embodiment of the present invention can be formed to have a thickness in the center portion of the area connected to the secondary battery cell 10 that is smaller than the heat transfer prevention portion 32.

[0103] That is, in the center portion of the region where the multi-layer member 30 contacts the secondary battery cell 10 , the thickness tc2 of the heat transfer preventing portion 32 may be formed to be greater than the thickness tc1 of the fire-resistant portion 31 .

[0104] At this time, in the outer portion of the area connected to the secondary battery cell 10, the thickness te1 of the fire-resistant portion 31 and the thickness te2 of the heat transfer prevention portion 32 can be the same, or the thickness te1 of the fire-resistant portion 31 can be greater than the thickness te2 of the heat transfer prevention portion 32.

[0105] Will refer to it later Figure 4 An embodiment is described in which the thickness te1 of the fire-resistant portion 31 is thicker than the thickness te2 of the heat transfer preventing portion 32 at the outer side of the region contacting the secondary battery cell 10 .

[0106] As described above, the heat transfer preventing portion 32 may be formed at a greater ratio in a region facing the central portion of the secondary battery cell 10 where more heat is generated.

[0107] Thus, heat transfer can be prevented at a relatively high ratio in the central portion of the secondary battery cell 10 where a large amount of heat is generated.

[0108] Therefore, by increasing the heat transfer prevention effect in a portion that generates more heat and decreasing the heat transfer prevention effect in a portion that generates less heat, heat transfer can be prevented more effectively.

[0109] Figure 4 It is a main view showing an embodiment of adjusting the thickness of the fire-resistant part 31 on the outer side in the battery module of the present invention. Referring to the accompanying drawings, the fire-resistant part 31 of the battery module according to an embodiment of the present invention can be formed to have a thickness greater than the heat transfer prevention part 32 on the outer side of the area connected to the secondary battery cell 10.

[0110] That is, in the outer portion of the region where the multilayer member 30 contacts the secondary battery cell 10 , the thickness te1 of the fire-resistant portion 31 is formed to be larger than the thickness te2 of the heat transfer prevention portion 32 .

[0111] At this time, in the central portion of the area connected to the secondary battery cell 10, the thickness tc1 of the fire-resistant portion 31 and the thickness tc2 of the heat transfer prevention portion 32 may be the same, or the thickness tc2 of the heat transfer prevention portion 32 may be greater than the thickness tc1 of the fire-resistant portion 31.

[0112] Refer to above Figure 3 An embodiment has been described in which the thickness tc2 of the heat transfer preventing portion 32 is greater than the thickness tc1 of the fire-resistant portion 31 in the central portion of the region adjoining the secondary battery cell 10 .

[0113] As described above, since the area where flames are generated by the explosion of the secondary battery cell 10 is mainly the outer part of the secondary battery cell 10, the fire-resistant portion 31 can be formed at a larger proportion in the area facing the outer part of the secondary battery cell 10 where the flame generation ratio is high.

[0114] Thus, it is possible to ensure higher durability in the outer portion of the secondary battery cell 10 where flames are more likely to be generated.

[0115] Therefore, durability can be more effectively ensured by increasing durability in a portion where material burnout problems often occur due to a large amount of flame generation and lowering durability in a portion where a small amount of flame generation occurs.

[0116] Figure 5 It is a main view showing an embodiment in which the thickness of the fire-resistant part 31 in the battery module of the present invention is adjusted to gradually change from the center to the outer side. Referring to the accompanying drawings, the fire-resistant part 31 of the battery module according to an embodiment of the present invention can be formed to have a thickness that is gradually smaller than the heat transfer prevention part 32 from the outer side of the area connected to the secondary battery unit to the center.

[0117] That is, in the central portion of the area where the multilayer component 30 is connected to the secondary battery cell 10, the thickness tc2 of the heat transfer prevention portion can be formed to be greater than the thickness tc1 of the fire-resistant portion 31, and in the outer portion of the area where the multilayer component 30 is connected to the secondary battery cell 10, the thickness te1 of the fire-resistant portion 31 can be formed to be greater than the thickness of the heat transfer prevention portion 32.

[0118] Furthermore, by gradually changing the thickness adjustment ratio as described above, the heat transfer prevention effect can be gradually improved toward the center of the secondary battery cell 10, where more heat is generated. In addition, the outer portion of the secondary battery cell 10, where more flames are generated, is gradually strengthened, thereby preventing the problem of burning due to flames.

[0119] Figure 6 This is a front view illustrating an embodiment of a battery module according to the present invention in which a heat transfer prevention portion 32 forms an outer layer and a fire-resistant portion 31 forms an inner layer. Referring to the drawings, the multilayer component 30 of a battery module according to one embodiment of the present invention may include: a heat transfer prevention portion 32 forming an outer layer adjacent to the secondary battery cells; and a fire-resistant portion 31 disposed so that both side surfaces of the heat transfer prevention portion 32 are in contact with the fire-resistant portion 31 to form an inner layer. The heat transfer prevention portion 32 is formed of a material having a lower thermal conductivity than the fire-resistant portion 31.

[0120] That is, the multilayer member 30 may include the fire-resistant portion 31 and the heat transfer preventing portion 32 having lower thermal conductivity than the fire-resistant portion 31 , so as to prevent the transfer of heat generated in any one of the secondary battery cells 10 by forming at least a portion having lower thermal conductivity than other portions.

[0121] Here, the multi-layer member 30 may be formed with the fire-resistant portion 31 at a central portion in the thickness direction (X), and may be formed with the heat transfer preventing portion 32 at an outer portion in the thickness direction (X).

[0122] In addition, refer to Figure 2The above embodiment is described as a structure in which the fire-resistant portion 31 forms an outer layer and the heat transfer prevention portion 32 forms an inner layer. Figure 6 The embodiment described is a structure in which the fire-resistant portion 31 forms an inner layer and the heat transfer prevention portion 32 forms an outer layer. Figure 2 The limitations on the materials, thickness, etc. of the fire-resistant portion 31 and the heat transfer prevention portion 32 described in the above description can all be applied to the reference Figure 6 Illustrated embodiment.

[0123] Figure 7 The figure is a front view illustrating an embodiment of a battery module according to the present invention in which a heat transfer prevention portion 32 forms an outer layer and a core buffer portion 33 forms an inner layer. Referring to the figure, the multilayer component 30 of a battery module according to one embodiment of the present invention may include: a heat transfer prevention portion 32 forming an outer layer adjacent to the secondary battery cells 10; and a core buffer portion 33, which is disposed so that both side surfaces contact the heat transfer prevention portion 32 to form an inner layer and elastically deforms and compresses when the secondary battery cells 10 expand. The heat transfer prevention portion 32 may be formed of a material having a lower thermal conductivity than the core buffer portion 33.

[0124] Here, the multilayer member 30 may have the core buffer portion 33 formed at a central portion in the thickness direction (X), and may have the heat transfer preventing portion 32 formed at an outer portion in the thickness direction (X).

[0125] That is, the multilayer component 30 may include a core buffer 33 and a heat transfer preventing portion 32 having lower thermal conductivity than the core buffer 33 to prevent transfer of heat generated in any one of the secondary battery cells 10 by forming at least a portion having lower thermal conductivity than other portions.

[0126] In addition, durability can be improved by absorbing the pressing force caused by the swelling of the secondary battery cell 10 by the core buffer 33. That is, when a specific secondary battery cell 10 expands, the core buffer 33 is compressed and elastically deformed. Therefore, the volume expansion of the entire battery module including a plurality of the secondary battery cells 10 can be suppressed. To this end, the core buffer 33 can be set to the shape of a pad or a sheet. In addition, the core buffer 33 can be formed using a foam-like material such as polyurethane foam (PU foam), but is not limited thereto.

[0127] In addition, the above reference Figure 2 The limitations on the material and thickness of the heat transfer prevention portion 32 described in the examples above can all be applied to the reference examples. Figure 7 Illustrated embodiment.

[0128] Figure 8 1 is a front view illustrating an embodiment in which a heat transfer prevention portion 32 forming an outer layer in a battery module according to the present invention is fixed to a secondary battery cell 10 via an adhesive or tape T. Specifically, referring to the accompanying drawings, the heat transfer prevention portion 32 of a battery module according to one embodiment of the present invention can be fixed to the secondary battery cell 10 via an adhesive or tape T. Therefore, the multilayer component 30 including the heat transfer prevention portion 32 can be stably disposed between the secondary battery cells 10.

[0129] However, when the multilayer component 30 including the heat transfer preventing portion 32 is provided between the secondary battery cells 10 , the multilayer component may also be provided without using an adhesive or tape T and not be fixed between the secondary battery cells.

[0130] Although the embodiments of the present invention are described above, the scope of rights of the present invention is not limited thereto, and it is obvious to a person skilled in the art in the art that various modifications and variations can be made to the present invention without departing from the scope of the technical idea of ​​the present invention as recorded in the claims.

Claims

1. A battery module comprising: a plurality of secondary battery cells; a housing member configured to accommodate a plurality of the secondary battery cells; as well as a multilayer component provided between the plurality of secondary battery cells, wherein at least a portion of the multilayer component in the first direction is formed of a material having lower thermal conductivity than other portions thereof, The multi-layer component comprises: a fire-resistant portion forming an outer layer adjacent to the secondary battery cell; as well as The heat transfer prevention portion is provided so that both sides thereof are in contact with the refractory portion to form an inner layer, and is formed of a material having a lower thermal conductivity than the refractory portion. The fire-resistant portion is formed to have a thickness greater than that of the heat transfer preventing portion in an outer portion of a region contacting the secondary battery cell.

2. The battery module according to claim 1, wherein: The heat transfer preventing portion is formed of a material having a thermal conductivity of 0.3 W / (m·K) or less.

3. The battery module according to claim 1, wherein: The heat transfer preventing portion is formed of a material including at least one of a polymer material and an inorganic material.

4. The battery module according to claim 1, wherein: The fire-resistant portion is formed of a material having higher fire resistance than that of the heat transfer preventing portion.

5. The battery module according to claim 1, wherein: The refractory portion is formed of a material having a melting point higher than 1000°C. The battery module according to claim 1 , wherein: The refractory portion is formed of a material that maintains its shape at least at 1000°C.

7. The battery module according to claim 1, wherein: The refractory portion is formed to have a thickness greater than 0.01 mm.

8. The battery module according to claim 1, wherein: The fire-resistant portion is formed to have a thickness smaller than that of the heat transfer preventing portion in the entire region in contact with the secondary battery cell.

9. The battery module according to claim 1, wherein: The fire-resistant portion is formed to have a smaller thickness in a central portion of a region contacting the secondary battery cell than the heat transfer preventing portion.

10. The battery module according to claim 1, wherein The fire-resistant portion is formed so that its thickness gradually becomes smaller than that of the heat transfer preventing portion from the outer portion of the region in contact with the secondary battery cell toward the center portion.

11. A battery module comprising: a plurality of secondary battery cells; a housing member configured to accommodate a plurality of the secondary battery cells; as well as a multilayer component provided between the plurality of secondary battery cells, wherein at least a portion of the multilayer component in the first direction is formed of a material having lower thermal conductivity than other portions thereof, The multi-layer component comprises: a heat transfer preventing portion forming an outer layer adjacent to the secondary battery cell; as well as The refractory portion is provided so that both sides thereof are in contact with the heat transfer preventing portion to form an inner layer. The heat transfer preventing portion is formed of a material having a lower thermal conductivity than the refractory portion. The heat transfer prevention portion is formed to have a thickness greater than that of the fire-resistant portion in a central portion of a region in contact with the secondary battery cell.

12. A battery module comprising: a plurality of secondary battery cells; a housing member configured to accommodate a plurality of the secondary battery cells; as well as a multilayer component provided between the plurality of secondary battery cells, wherein at least a portion of the multilayer component in the first direction is formed of a material having lower thermal conductivity than other portions thereof, The multi-layer component comprises: a heat transfer preventing portion forming an outer layer adjacent to the secondary battery cell; as well as a core buffer portion, which is provided with both side surfaces contacting the heat transfer preventing portion to form an inner layer and is elastically deformed and compressed when the secondary battery cell expands, The heat transfer preventing portion is formed of a material having a lower thermal conductivity than the core buffer portion.

13. The battery module according to claim 11 or 12, wherein: The heat transfer preventing portion is fixed to the secondary battery cell by an adhesive or an adhesive tape.

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