Battery Package

Abstract

The present invention discloses a battery package that may include a pack case, a plurality of battery modules accommodated in accommodation spaces of the pack case, drain portions disposed below the battery modules, and a thermally conductive member disposed between the battery modules and the drain portion, the thermally conductive member melting and flowing down into the drain portion when the battery modules experience thermal runaway, thereby forming a thermally insulating space between the battery modules and the drain portion.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0019182, filed February 14, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery package that can prevent a chain reaction of thermal runaway in adjacent battery modules by blocking heat transfer to adjacent battery modules through a lower plate of a pack case when a battery module experiences thermal runaway. [Background technology]

[0003] Typically, a secondary battery includes a positive electrode, a negative electrode, and an electrolyte, and generates electrical energy through a chemical reaction. The use of secondary batteries is gradually increasing due to their rechargeable / dischargeable characteristics. Among these secondary batteries, lithium secondary batteries, with their high energy density per unit weight, are widely used as power sources for electronic communication devices and as driving sources for high-power hybrid and electric vehicles.

[0004] In terms of the shape of these secondary batteries, there is an increasing demand for prismatic and pouch-type battery cells that are thin and can be applied to products such as mobile phones, etc. In terms of battery cell materials, there is an increasing demand for lithium battery cells such as lithium-ion batteries and lithium-ion polymer batteries that have high energy density, discharge voltage, and output stability.

[0005] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these battery cells is approximately 2.5V to 4.2V. If a higher output voltage is required, a battery module is formed by connecting multiple battery cells in series, and a battery package is formed by connecting multiple battery modules. Furthermore, a battery package is formed by connecting multiple battery cells in parallel depending on the charge / discharge capacity required for the battery package. As a result, the number of battery cells and the electrical connection structure of the battery package can be variously set depending on the required output voltage or charge / discharge capacity.

[0006] The battery package has a barrier beam installed across the interior of the pack case to divide the battery module storage space into multiple compartments. The battery package also has a thermal resin disposed between the underside of each battery module and the bottom plate of the pack case. This allows thermal energy generated in the battery module to be dissipated through the thermal resin and the bottom plate. To improve the heat dissipation performance of the battery package, a heat sink can be installed on the inside or outside of the bottom plate. A firewall can also be installed between multiple battery modules to prevent fires from spreading to adjacent battery modules.

[0007] However, the heat generated in the battery modules during the charging and discharging process of the battery package may not be effectively dissipated. In this case, heat accumulation occurs in some battery modules, which may cause deterioration of the battery modules, and the rapid deterioration may cause thermal runaway of the battery modules.

[0008] If thermal runaway occurs in one of the battery modules, heat can be rapidly transferred to adjacent battery modules through the thermal resin, which has excellent thermal conductivity, and the lower plate of the pack case, accelerating a chain reaction of thermal runaway, which increases the risk of fire and explosion in the battery package.

[0009] In addition, conventional technologies have focused on developing thermal resins to more quickly dissipate heat energy in the event of a battery module fire or thermal runaway. However, if thermal resins with excellent heat dissipation performance are used inside a battery package, when a battery module experiences thermal runaway, heat transfer to adjacent battery modules via the thermal resin and the bottom plate may be accelerated. This may further increase the risk of the battery package catching fire or exploding.

[0010] In addition, battery modules are constructed with a resin separator layered between the positive and negative electrodes. Polyethylene separators begin to break down at around 130°C, while polypropylene separators begin to break down at around 170°C. The electrolyte releases heat as it decomposes at around 200°C. As a result, the battery module rapidly deteriorates in a short period of time, and thermal runaway begins at around 600-800°C. This calls for technology to stop the chain reaction of thermal runaway before the battery module reaches the thermal runaway starting temperature.

[0011] The background art of the present invention is disclosed in Korean Patent Publication No. 2022-0035770 (published on March 22, 2022, title of invention: Battery pack applying a structure for preventing heat diffusion between battery modules). Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a battery package that can improve heat dissipation performance when the battery package is operating normally.

[0013] An object of the present invention is to provide a battery package in which a heat-insulating space can be formed by melting a heat-conducting member when a thermal runaway occurs in a battery module.

[0014] An object of the present invention is to provide a battery package that can prevent thermal energy from being conducted to adjacent battery modules when a thermal runaway occurs in a battery module.

[0015] SUMMARY OF THE INVENTION An object of the present invention is to provide a battery package that can prevent the battery module from being further heated by high-temperature gas generated when the battery module experiences thermal runaway.

[0016] An object of the present invention is to provide a battery package that can stably maintain a heat insulating space between a battery module and a drain portion.

[0017] The technical object of the present invention is not limited to the above-mentioned objects, and other unmentioned objects and advantages of the present invention can be understood from the following description and can be more clearly understood from the examples of the present invention. Furthermore, it can be easily understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0018] In order to solve the above-mentioned problems, the battery package according to the present invention may include a pack case, a plurality of battery modules accommodated in an accommodation space of the pack case, and a thermal conduction member arranged at the bottom of the pack modules.

[0019] The heat conducting member melts at a predetermined temperature or higher.

[0020] The battery package includes a drain portion disposed at a lower portion of the battery module.

[0021] At least a portion of the heat conducting member is disposed above the drain portion.

[0022] The thermally conductive member may be disposed between the battery module and the drain portion.

[0023] The heat conducting member may melt at a predetermined temperature or higher and flow down to the drain portion.

[0024] The space where the melted thermally conductive member was located forms a heat insulating space between the battery module and the drain portion.

[0025] The predetermined temperature may be lower than a thermal runaway temperature of the battery module, whereby the thermal conductive member forms a heat insulating space between the battery module and the drain unit when the battery module experiences thermal runaway.

[0026] The predetermined temperature may be 600 degrees Celsius or less, and preferably 550 degrees Celsius or less.

[0027] The predetermined temperature may be equal to or higher than the collapse temperature of the separation membrane.

[0028] The predetermined temperature may be equal to or higher than the decomposition temperature of the electrolyte.

[0029] The predetermined temperature may be equal to or higher than the lower of the collapse temperature of the separator and the decomposition temperature of the electrolyte.

[0030] The predetermined temperature may be equal to or higher than the higher of the collapse temperature of the separator and the decomposition temperature of the electrolyte.

[0031] The predetermined temperature may be 120 degrees Celsius or higher, and preferably 200 degrees Celsius or higher.

[0032] The drain portion may include a plurality of support ribs formed on a lower plate of the pack case to support the heat conduction member, a plurality of drain hole portions formed between the plurality of support ribs, and a plurality of drain channel portions formed below the drain hole portions.

[0033] The plurality of drain channel portions may be formed side by side on the lower plate.

[0034] The plurality of drain holes may be arranged along the length of the drain channel portion.

[0035] The plurality of support ribs may be made of a thermally conductive material.

[0036] The drain portion may further include one or more vent channel portions connecting the plurality of drain channel portions.

[0037] The vent channel portion may be connected to longitudinal ends of a plurality of drain channel portions.

[0038] The vent channel portion may be disposed perpendicular to the drain channel portion.

[0039] The drain portion may further include a plurality of cooling channel portions formed in the lower plate.

[0040] The cooling channel portion may be formed inside the plurality of support ribs.

[0041] The cooling channel portion may be formed in line with the length of the support rib.

[0042] The battery pack may further include a load support member that supports the battery module.

[0043] The load support member can prevent the battery module from descending when the thermally conductive member melts and flows down to the drain portion.

[0044] The load support member may support both longitudinal end portions of the battery module.

[0045] The battery package may further include a plurality of barrier beams installed across the interior of the pack case to partition the storage space.

[0046] The barrier beams may be arranged perpendicular to the length of the drain channel portion.

[0047] The battery package may further include a plurality of center beams disposed between the plurality of barrier beams to support the plurality of barrier beams. [Effects of the Invention]

[0048] According to the present invention, the thermal resin transfers the thermal energy generated in the battery module to the drain part and the lower plate during normal operation of the battery package, thereby improving the heat dissipation performance during normal operation of the battery package.

[0049] According to the present invention, the thermal conductive member melts during thermal runaway of the battery module, and the molten material of the thermal conductive member flows down to the drain section. An insulating space is formed where the thermal conductive member is installed. This prevents heat of approximately 600-800°C, which is generated during thermal runaway of the battery module, from being transferred to the drain section and the lower plate through the insulating space.

[0050] According to the present invention, even if the high temperature heat generated in the battery module is transferred to the drain part and the lower plate to a certain extent due to the insulating space, it is possible to prevent a chain reaction of thermal runaway in adjacent battery modules.

[0051] According to the present invention, the multiple battery modules are kept isolated in their respective storage spaces by the barrier beams and center beam, so that even if some of the battery modules experience thermal runaway, the battery beams and center beam can prevent thermal energy from diffusing or transferring to adjacent storage spaces.

[0052] According to the present invention, the vent channel portion discharges gas generated when the battery module experiences thermal runaway to the outside, thereby preventing the battery module in a thermal runaway state from being further heated by high-temperature gas.

[0053] According to the present invention, the load support member can prevent the battery module from descending when the thermal conductive member melts and flows down to the drain portion, thereby stably maintaining a heat insulating space between the battery module and the drain portion.

[0054] The above-mentioned effects and specific effects of the present invention will be described in conjunction with the following description of the preferred embodiment of the invention. [Brief explanation of the drawings]

[0055] [Figure 1] 1 is a perspective view schematically illustrating a battery package according to the present invention; [Figure 2] 2 is a cross-sectional view schematically showing a state in which a heat conduction member and a drain portion are installed under the battery module in FIG. 1. FIG. [Figure 3] 2 is a cross-sectional view schematically showing the II' cross section of the battery package in FIG. 1. FIG. [Figure 4] 2 is a plan view schematically showing a state in which support ribs and drain holes are formed in the lower plate of the battery package in FIG. 1. FIG. [Figure 5] 10 is a cross-sectional view schematically illustrating a state in which a thermal conductive member melts and flows down into a drain hole when a thermal runaway occurs in the battery module according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0056] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0057] The present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms and may be modified in various ways. However, these embodiments are provided to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. Therefore, the present invention is not limited to the embodiments disclosed below, and should be understood to include any modifications, equivalents, or alternatives within the technical spirit and scope of the present invention, as well as the substitution or addition of the configuration of any embodiment with the configuration of another embodiment.

[0058] The accompanying drawings are intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to include any modifications, equivalents, or alternatives that fall within the spirit and technical scope of the present invention. The components in the drawings may be exaggerated in size or thickness for ease of understanding, but this should not be interpreted as limiting the scope of protection of the present invention.

[0059] The terms used in this specification are merely used to describe particular embodiments or examples and are not intended to limit the present invention. Furthermore, singular terms include plural terms unless the context clearly dictates otherwise. Terms such as "comprises," "constitutes," and the like in the specification are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. In other words, terms such as "comprises," "constitutes," and the like in the specification should not be understood to preclude the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0060] Although terms including ordinal numbers, such as first, second, etc., are used to describe various components, the components are not limited by the terms and are used only to distinguish one component from another.

[0061] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that the component may be directly coupled or connected to the other component, but that there may be other components between them. On the other hand, when a component is referred to as being "directly coupled" or "directly connected" to another component, it should be understood that there are no other components between them.

[0062] When a component is referred to as being "on top of" or "under" another component, it should be understood that it is not only positioned directly on top of the other component, but that there may be other components in between.

[0063] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms similar to those defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0064] In the following, a battery package according to an embodiment of the present invention will be described.

[0065] FIG. 1 is a perspective view schematically showing a battery package according to the present invention, FIG. 2 is a cross-sectional view schematically showing a state in which a thermal conductive member and a drain portion are installed at the bottom of the battery module in FIG. 1, FIG. 3 is a cross-sectional view schematically showing the I-I' cross section of the battery package in FIG. 1, FIG. 4 is a plan view schematically showing a state in which a support rib and a drain hole portion are formed on the bottom plate of the battery package in FIG. 1, and FIG. 5 is a cross-sectional view schematically showing a state in which the thermal conductive member melts and flows down into the drain hole portion during thermal runaway of the battery module according to the present invention.

[0066] 1 to 5, a battery package 100 according to an embodiment of the present invention includes a pack case 110, a plurality of battery modules 120, a drain portion 130, and a heat conduction member 140.

[0067] The pack case 110 includes a lower plate 111, a side plate 112 that surrounds the periphery of the lower plate 111, and an upper plate 113 that covers an upper portion of the side plate 112. The lower plate 111 and the upper plate 113 are formed in a rectangular plate shape, and the side plate 112 is formed in a rectangular frame shape so as to surround the periphery of the lower plate 111 and the upper plate 113. The pack case 110 is formed of a material with excellent thermal conductivity, such as aluminum, so that it can dissipate thermal energy from the battery module 120.

[0068] A plurality of barrier beams 115 are installed inside the pack case 110 to partition storage spaces 118 for the battery modules 120. A plurality of center beams 116 are installed between the plurality of barrier beams 115 to support the plurality of barrier beams 115. The barrier beams 115 and the center beams 116 form a lattice-shaped storage space. The barrier beams 115 have the form of straight beams to support the lower plate 111 and the upper plate 113. The length of the plurality of center beams 116 is formed to be the same as the spacing between the barrier beams 115. In addition, the ends of the barrier beams 115 support the side plates 112. The barrier beams 115 and the center beam 116 prevent flames and gases in each storage space 118 from spreading to adjacent storage spaces 118. In addition, the barrier beams 115 and the center beam 116 reinforce the rigidity of the pack case 110. Therefore, even if an external impact or vibration is transmitted to the pack case 110, the pack case 110, the barrier beam 115, and the center beam 116 can prevent the battery package 100 from being deformed or collapsed.

[0069] The plurality of barrier beams 115 may be arranged perpendicular to the length direction of the drain channel portion 135, which will be described later. Since the plurality of barrier beams 115 and the drain channel portion 135 are arranged perpendicularly, the rigidity of the pack case 110 in the left-right and front-rear directions can be further reinforced. This makes it possible to prevent the pack case 110 from being deformed or collapsed due to external impact or vibration.

[0070] The plurality of battery modules 120 are respectively accommodated in the accommodation space 118 of the pack case 110. The battery module 120 is formed by stacking a plurality of battery cells. The battery cells may be cylindrical, prismatic, or pouch-shaped. The battery cells have a form in which an electrode assembly is impregnated with an electrolyte. The electrode assembly is formed by stacking or winding a negative electrode, a positive electrode, and a separator.

[0071] Terminals (not shown) of opposite polarities are connected to both sides of the battery module 120. The terminals of the battery module 120 are electrically connected to a plurality of bus bars (not shown) arranged on a bus bar frame (not shown). The plurality of bus bars may be connected in series and parallel depending on the capacity and output voltage of the battery package 100.

[0072] The drain part 130 is disposed at the bottom of the battery module 120. The drain part 130 may be formed integrally with the bottom plate 111 of the pack case 110 or may be manufactured separately. The drain part 130 forms a space through which the thermally conductive member 140 melts and flows. The drain part 130 is made of a material with excellent thermal conductivity. The drain part 130 also functions as a heat sink that dissipates heat together with the thermally conductive member 140.

[0073] The thermal conductive member 140 is disposed between the battery module 120 and the drain unit 130, and melts and flows down to the drain unit 130 when the battery module 120 experiences thermal runaway. As the molten material 141 of the thermal conductive member 140 flows down to the drain unit 130, a heat insulating space 143 is formed between the battery module 120 and the drain unit 130. The molten material 141 that has flowed down to the drain unit 130 is spaced apart from the lower surface of the battery module 120, and the heat insulating space 143 is filled with air. The thermal conductive member 140 may be a thermal resin or a thermal pad formed in a flat plate shape and made of a material with excellent thermal conductivity.

[0074] The thermal conductive member 140 transfers thermal energy generated in the battery module 120 to the drain unit 130 and the lower plate 111 when the battery package 100 is operating normally. As a result, when the battery package 100 is operating normally, the thermal conductive member 140 functions as a heat dissipation member or a thermal conductive member 140 that transfers thermal energy generated in the battery module 120 to the drain unit 130 and the lower plate 111.

[0075] Furthermore, the battery module 120 may ignite or experience thermal runaway during charging and discharging. When the battery module 120 experiences thermal runaway, the thermal conductive member 140 melts and flows down to the drain unit 130, forming an insulating space 143 in the area where the thermal conductive member 140 was removed. This prevents heat of approximately 600-800°C, generated during thermal runaway of the battery module 120, from being transferred to the drain unit 130 and the lower plate 111 by the insulating space 143. As a result, the insulating space 143 prevents high-temperature heat generated in the igniting battery module 120 from being transferred to an adjacent battery module 120. Even if some of the high-temperature heat generated in the battery module 120 is transferred to the drain unit 130 by the insulating space 143, it is possible to prevent a chain reaction of thermal runaway in the adjacent battery modules 120.

[0076] In addition, the multiple battery modules 120 are isolated into their respective storage spaces 118 by the barrier beams 115 and center beams 116, so that even if some of the battery modules 120 experience thermal runaway, the barrier beams 115 can prevent thermal energy from diffusing or transferring to adjacent storage spaces 118.

[0077] In this way, in the event of thermal runaway in some of the battery modules 120, the insulating space 143 blocks the thermal runaway chain reaction event through the drain section 130 and the lower plate 111, and the barrier beam 115 and the center beam 116 prevent the thermal runaway chain reaction from occurring in adjacent spaces.

[0078] In addition, the thermal conductive member 140 according to the present invention can selectively implement a heat dissipation function and a heat insulation function depending on the temperature range of the battery module 120.

[0079] Since lithium ion batteries are known to experience thermal runaway at approximately 600-800°C, the thermal conductive member 140 according to the present invention preferably melts and flows down to the drain portion 130 at approximately 450-550°C. Of course, since the thermal runaway temperature of the battery module 120 may vary depending on the components of its constituent materials, the melting temperature of the thermal conductive member 140 can be designed through thermal runaway experiments of the battery module 120.

[0080] The drain portion 130 includes a plurality of support ribs 131 , a plurality of drain holes 133 and a plurality of drain channels 135 .

[0081] The plurality of support ribs 131 are formed on the lower plate 111 of the pack case 110 to support the thermally conductive member 140. The plurality of support ribs 131 may be manufactured simultaneously with the lower plate 111 when the lower plate 111 is extruded. Alternatively, the plurality of support ribs 131 may be manufactured separately from the lower plate 111 and then joined to the lower plate 111 by welding or the like. Since the plurality of support ribs 131 support the thermally conductive member 140, the thermally conductive member 140 comes into close contact with the lower surface of the battery module 120, preventing the thermally conductive member 140 from lifting up from the lower surface of the battery module 120. The plurality of support ribs 131 also serve to reinforce the rigidity of the pack case 110.

[0082] The plurality of drain holes 133 are formed between the plurality of support ribs 131. Because the plurality of drain holes 133 are arranged between the support ribs 131, the rigidity of the pack case 110 is hardly reduced by the drain holes 133.

[0083] The plurality of drain channel portions 135 are formed below the drain hole portions 133. The width of the drain channel portions 135 is greater than the size of the drain hole portions 133. The plurality of drain channel portions 135 may be formed in the left-right direction or the front-rear direction of the lower plate 111.

[0084] The plurality of drain channel portions 135 are formed in parallel on the lower plate 111. The plurality of drain channel portions 135 may be arranged at equal intervals. In this case, the drain channel portions 135 may be formed in a straight line parallel or perpendicular to the length direction of the battery module 120. The drain channel portions 135 may be formed in parallel with the extrusion direction when the lower plate 111 is extruded.

[0085] The drain holes 133 may be arranged in one row or in multiple rows along the length of each drain channel 135. The drain holes 133 may be spaced at regular intervals. The drain holes 133 may also be circular, elliptical, polygonal, or short slit-shaped. This allows the molten material 141 of the thermal conductive member 140 to flow down into the drain channel 135 through the drain holes 133. Furthermore, because the drain holes 133 are arranged along the length of the drain channel 135, the rigidity of the lower plate 111 may be prevented from being weakened. However, if one or two drain holes 133 are formed long for each drain channel 135, the rigidity of the drain portion 130 may be reduced.

[0086] The drain unit 130 further includes one or more vent channels 137 connecting the plurality of drain channels 135. The vent channels 137 are connected to the outside. When the battery module 120 experiences thermal runaway, the thermal conductive member 140 may melt and generate gas. Most of the gas flows into the drain channels 135 and then into the vent channels 137, and the gas in the vent channels 137 is discharged to the outside. Some of the gas may also be discharged into the accommodating space 118. This prevents the battery module 120 from being further heated by the high-temperature gas during thermal runaway.

[0087] The vent channel portion 137 is connected to longitudinal ends of the plurality of drain channel portions 135. The vent channel portion 137 is disposed around the periphery of the lower plate 111. In this case, the vent channel portion 137 is disposed perpendicular to the drain channel portions 135. The vent channel portion 137 may be formed by forming around the periphery of the lower plate 111. Of course, the vent channel portion 137 may be separately manufactured and then welded to the lower plate 111.

[0088] The drain unit 130 may further include a plurality of cooling channels 139 formed in the lower plate 111. A cooling medium such as coolant flows through the cooling channels 139. As a result, the drain unit 130 can also function as a heat sink for cooling the battery module 120.

[0089] The cooling channel portion 139 is formed inside the plurality of support ribs 131. In this case, the cooling channel portion 139 may be formed parallel to the length direction of the support ribs 131. The cooling channel portion 139 may be formed in some of the support ribs 131 or in all of the support ribs 131. The cooling channel portion 139 may be designed appropriately in consideration of the capacity and size of the battery package 100.

[0090] The battery package 100 may further include load support members 150 that support the battery modules 120. The load support members 150 may be formed in a block shape. The load support members 150 stably fix the battery modules 120. These load support members 150 may be formed in various shapes as long as they fix the positions of the battery modules 120.

[0091] The load support member 150 prevents the battery module 120 from descending when the thermally conductive member 140 melts and flows down into the drain unit 130. As a result, when the thermally conductive member 140 is removed between the underside of the battery module 120 and the drain unit 130, the heat insulating space 143 can be stably maintained between the battery module 120 and the drain unit 130.

[0092] The load support members 150 support both longitudinal end portions of the battery module 120. At this time, the load support members 150 can support the lower surface of the battery module 120.

[0093] Although the present invention has been described above with reference to illustrative drawings, it is clear that the present invention is not limited to the embodiments and drawings disclosed in this specification, and that various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configurations of the present invention are not explicitly described in the above-described embodiments of the present invention, it is natural that the effects that can be predicted by the configurations should also be recognized. [Explanation of symbols]

[0094] 100 battery packages 110 pack case 111 Lower Plate 112 Side Plate 113 Upper Plate 115 Barrier Beam 116 Center Beam 118 Containment Space 120 Battery Module 130 Drain section 131 Support Rib 133 Drain hole 135 Drain channel section 137 Vent channel section 139 Cooling channel section 140 Thermal Conduction Materials 141 Molten Materials 143 Insulated Space 150 Load-bearing member

Claims

1. Pack case, a plurality of battery modules respectively accommodated in the accommodation spaces of the pack case; a drain portion disposed at a lower portion of the battery module; and a thermally conductive member disposed between the battery module and the drain portion, The heat conduction member melts at a predetermined temperature or higher and flows down to the drain portion. Battery package.

2. The drain portion is a plurality of support ribs formed on a lower plate of the pack case to support the heat conduction member; a plurality of drain holes formed between the plurality of support ribs; and a plurality of drain channel portions formed below the drain hole portions; The battery package of claim 1 .

3. the plurality of drain channel portions are formed side by side on the lower plate; The battery package of claim 2 .

4. The plurality of drain holes are arranged along the length direction of the drain channel portion. The battery package of claim 3 .

5. the plurality of support ribs are formed of a thermally conductive material; The battery package of claim 2 .

6. The drain portion further includes one or more vent channel portions connecting the plurality of drain channel portions. The battery package according to any one of claims 2 to 5.

7. The vent channel portion is connected to longitudinal ends of the plurality of drain channel portions. The battery package of claim 6.

8. The vent channel portion is disposed perpendicular to the drain channel portion. The battery package of claim 6.

9. The drain portion further includes a plurality of cooling channel portions formed in the lower plate. The battery package according to any one of claims 2 to 5.

10. The cooling channel portion is formed inside the plurality of support ribs. The battery package of claim 9.

11. The cooling channel portion is formed in line with the length direction of the support rib. The battery package of claim 9.

12. Further comprising a load support member for supporting the battery module. The battery package according to any one of claims 1 to 5.

13. The load support member prevents the battery module from descending when the thermal conductive member melts and flows down to the drain portion. The battery package of claim 12.

14. The load support member supports both longitudinal end portions of the battery module. The battery package of claim 12.

15. The pack case further includes a plurality of barrier beams disposed across the interior of the pack case to partition the storage space.

3. The battery package according to claim 1 or 2.

16. The plurality of barrier beams are arranged perpendicular to the length of the drain channel portion. The battery package according to claim 15, which recites claim 2.

17. The barrier structure further includes a plurality of center beams disposed between the plurality of barrier beams to support the plurality of barrier beams.

16. The battery package of claim 15.

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