Partition wall member with fire suppression pad and battery pack case including partition wall member

Abstract

The disclosed invention relates to a partition wall member mounted between a plurality of battery modules mounted within a battery pack, and in one example, at least one side surface of the partition wall member has a plurality of regularly aligned grooves, and a fire extinguishing pad having a fire extinguishing agent built therein is mounted in the plurality of grooves.

Description

Technical Field

[0001] The present invention relates to a light partition wall member having a fire extinguishing pad that automatically releases a fire extinguishing agent in response to a fire occurring in a battery case, and a battery case including the light partition wall member.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0029893 filed on March 7, 2023, and the entire contents of this Korean Patent Application are incorporated herein by reference. Background Art

[0003] Unlike primary batteries, secondary batteries are rechargeable and have been widely researched and developed in recent years due to their potential for miniaturization and large capacity. The demand for secondary batteries as energy sources is rapidly increasing due to the continuous development of technology and the demand for mobile devices, as well as the emergence of electric vehicles and energy storage systems in response to environmental protection needs.

[0004] Secondary batteries are classified into button-type batteries, cylindrical batteries, square batteries, and pouch-type batteries according to the shape of the battery case. In the secondary battery, an electrode assembly mounted in the battery case is a chargeable and dischargeable power generation device including a stacked structure of electrodes and separators.

[0005] Since secondary batteries need to be used continuously for a long time, the heat generated during the charging and discharging process needs to be effectively controlled. If the secondary battery is not cooled properly, the temperature increase will cause the current to increase, and the current increase will cause the temperature to rise again, causing a chain reaction and eventually leading to the catastrophic condition of thermal runaway.

[0006] In addition, if the secondary batteries are grouped in the form of modules or battery packs, the thermal runaway caused by one secondary battery will cause other secondary batteries nearby to continue to overheat, resulting in a heat propagation phenomenon. In other words, when thermal runaway occurs in a battery module in a battery pack, a large amount of conductive dust, gas, and flames are emitted from the high-voltage terminals of the battery module, causing dust to accumulate on the high-voltage terminals of other adjacent battery modules and triggering a heat transfer phenomenon through gas and flame heat transfer.

[0007] A design for preventing or delaying the transfer of high heat from a battery cell or module experiencing thermal runaway to an adjacent battery cell or module, the design comprising an insulation design and a heat dissipation design, wherein the insulation design uses insulating materials to prevent or delay the transfer of heat from a battery module experiencing thermal runaway to an adjacent battery module, and the heat dissipation design dissipates the heat from the battery module experiencing thermal runaway to the outside of the battery pack as early as possible and quickly to reduce heat transfer to adjacent battery modules.

[0008] Preventing and delaying thermal runaway is a critical issue, especially in electric vehicles, as thermal runaway can lead to life-threatening accidents and related regulations are becoming increasingly stringent. In other words, there needs to be enough delay before the thermal runaway phenomenon spreads so that there is time for emergency evacuation and safety measures. Therefore, it is necessary to take more effective measures to suppress or delay the occurrence of heat transfer in the battery pack. Summary of the invention

[0009] Technical issues

[0010] The present invention is directed to providing a partition wall member capable of preventing, suppressing or delaying heat propagation in a battery pack.

[0011] However, the technical problems to be solved by the present invention are not limited to the above problems, and those skilled in the art can clearly understand other problems not mentioned from the description of the present invention described below.

[0012] Technical Solution

[0013] The present invention relates to a partition wall component installed between multiple battery modules installed in a battery pack. In one example, at least one side surface of the partition wall component includes a plurality of regularly aligned groove structures, wherein the plurality of groove structures are equipped with a fire extinguishing pad with a built-in fire extinguishing agent.

[0014] In one embodiment of the present invention, the fire extinguishing mat may include a porous mat, a plurality of capsules built into the mat, and a liquid fire extinguishing agent sealed in the capsules.

[0015] For example, the liquid fire extinguishing agent may be a fluorinated ketone.

[0016] When the temperature of the fire extinguishing mat is within a temperature range of 120° C. to 220° C., the capsule may rupture due to melting or due to internal steam pressure, thereby releasing the fire extinguishing agent.

[0017] The fire extinguishing agent released from the capsule may be released to the outside through the holes of the porous pad.

[0018] In one embodiment of the present invention, the plurality of groove structures may form a honeycomb structure having a plurality of regularly aligned hexagonal grooves.

[0019] Here, the honeycomb structure may be provided on each of both sides of the partition wall member.

[0020] Furthermore, the honeycomb structures respectively provided on both sides of the partition wall member may be staggered with each other by half pitch in the longitudinal direction and / or the transverse direction, and the honeycomb structures respectively provided on both sides of the partition wall member are not connected to each other.

[0021] At the same time, the present invention can provide a battery pack housing, which includes: a bottom plate; a side plate, which surrounds the periphery of the bottom plate; a partition wall member configured as above, which is longitudinally and / or transversely arranged to divide the accommodating space defined by the side plate; and a lead, which closes the upper surface of the accommodating space.

[0022] In one example, the partition wall member may be a beam.

[0023] Beneficial Effects

[0024] According to the partition wall member of the present invention having the configuration as described above, the fire extinguishing pad exposed on one side surface thereof reacts to the abnormally high temperature of the battery module causing thermal runaway and releases the built-in fire extinguishing agent. By releasing the fire extinguishing agent, the high-temperature gas, particles and flame caused by the thermal runaway are cooled or extinguished, thereby playing a thermal protection role for other battery modules nearby and suppressing and delaying heat propagation.

[0025] In addition, the partition wall member of the present invention is configured to have a fire extinguishing pad containing a fire extinguishing agent built in, so the battery pack housing does not need to provide a separate space and device for accommodating and releasing the fire extinguishing agent. Therefore, by applying the partition wall member of the present invention, the heat propagation problem can be effectively addressed without changing the overall design of the battery pack housing and without sacrificing the battery pack capacity.

[0026] Furthermore, the partition wall member of the present invention can achieve light weight while ensuring sufficient rigidity by including a receiving space for the fire extinguishing mat in a honeycomb structure, thereby contributing to reducing the weight of the battery pack case.

[0027] However, the technical effects that can be obtained by the present invention are not limited to the above-mentioned effects, and those skilled in the art can clearly understand other effects that are not mentioned from the description of the present invention described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Since the following drawings of this specification illustrate exemplary embodiments of the present invention and together with the detailed description of the present invention described below help to understand the technical concept of the present invention, the present invention should not be limitedly interpreted according to the drawings.

[0029] Figure 1 2 is a drawing showing an example installation of a partition wall member according to one embodiment of the present invention.

[0030] Figure 2 It is taken along line "AA" Figure 1 A cross-sectional view of a partition wall member.

[0031] Figure 3is a drawing showing a cross-sectional view of a fire extinguishing mat.

[0032] Figure 4 It is a figure which shows another embodiment of a partition wall member.

[0033] Figure 5 1 is a diagram showing one embodiment of mounting a fire extinguishing mat to a partition wall member.

[0034] Figure 6 It is a figure which shows another embodiment which mounts the fire extinguishing mat on the partition wall member.

[0035] Figure 7 is a drawing showing a battery pack case including a partition wall member according to one embodiment of the present invention.

[0036] Figure 8 According to one embodiment of the present invention, a Figure 7 FIG. 1 is a diagram of a battery pack of a battery module in a battery pack housing.

[0037] Fig. 9 is shown with an installation Figure 7 FIG. 2 is a diagram of another embodiment of a battery pack having a battery module in a battery pack housing. DETAILED DESCRIPTION

[0038] The present invention is susceptible to various modifications and various embodiments, so specific embodiments thereof will be described in detail below.

[0039] However, it should be understood that the present invention is not limited to the specific embodiments, and includes all modifications, equivalents, or substitutes within the spirit and technical scope of the present invention.

[0040] The terms "comprising", "including" and "having" as used herein specify the presence of features, numbers, steps, actions, components or members described in the specification, or a combination thereof, and it should be understood that they do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, members or a combination thereof.

[0041] Furthermore, in the present invention, when a portion of a layer, film, region, plate, etc. is disposed "on" another portion, this includes not only a case where a portion is disposed "directly" "on" another portion, but also a case where another portion is interposed therebetween. Conversely, when a portion of a layer, film, region, plate, etc. is disposed "below" another portion, this includes not only a case where a portion is disposed "directly" "below" another portion, but also a case where another portion is interposed therebetween. Furthermore, in the present application, "on" may include not only a case where it is disposed on an upper portion, but also a case where it is disposed on a lower portion.

[0042] The present invention relates to a partition wall component installed between multiple battery modules installed in a battery pack. In one example, at least one side surface of the partition wall component includes multiple regularly aligned groove structures, wherein the multiple groove structures are equipped with fire extinguishing pads with built-in fire extinguishing agent.

[0043] In one embodiment of the present invention, a fire extinguishing mat may include a porous mat, a plurality of capsules built into the mat, and a liquid fire extinguishing agent sealed within the capsules.

[0044] According to the partition wall member of the present invention having the configuration as described above, the fire extinguishing pad exposed on one side surface thereof reacts to the abnormally high temperature of the battery module causing thermal runaway and releases the built-in fire extinguishing agent. By releasing the fire extinguishing agent, the high-temperature gas, particles and flames caused by thermal runaway are cooled or extinguished, thereby playing a thermal protection role for other battery modules nearby and suppressing and delaying heat propagation.

[0045] In addition, the partition wall member of the present invention is configured to have a fire extinguishing pad containing a fire extinguishing agent built in, so the battery pack housing does not need to provide a separate space and device for accommodating and releasing the fire extinguishing agent. This means that by applying the partition wall member of the present invention, the heat propagation problem can be effectively addressed without changing the overall design of the battery pack housing and without sacrificing the capacity of the battery pack.

[0046] Furthermore, the separation wall member of the present invention can achieve weight reduction while ensuring sufficient rigidity by organizing the space for accommodating the fire extinguishing pad into a honeycomb structure, thereby contributing to reducing the weight of the battery pack housing.

[0047] Mode for carrying out the invention

[0048] Hereinafter, a specific embodiment of a partition wall member 130 for a battery pack housing according to the present invention will be described in detail with reference to the accompanying drawings. For reference, the front, rear, upper, lower, left, and right directions used to indicate relative positions in the following description are for understanding the present invention, and unless otherwise specified, the directions shown in the accompanying drawings shall prevail.

[0049] [First embodiment]

[0050] Figure 1 is a diagram showing an example installation of a partition wall member 130 according to the present invention, and Figure 2 It is taken along line "AA" Figure 1 sectional view of the partition wall member 130.

[0051] Figure 11 is a diagram showing that the partition wall member 130 (hereinafter referred to as "partition wall member") of the battery pack according to the present invention can be applied as the center beam 140 and / or the cross beam 150 of the battery pack housing 100. Here, the center beam 140 is defined as a longitudinal partition wall member 130 that passes through the center of the battery pack housing 100 and divides the internal accommodation space from one side to the other side, and the cross beam 150 is defined as a transverse partition wall member 130 that forms a grid relative to the center beam 140.

[0052] The partition wall member 130 of the present invention corresponds to a member installed between the plurality of battery modules 200 installed in the battery pack 10 to form a plurality of accommodation spaces, and one battery module 200 is installed in each of the divided accommodation spaces. Therefore, the partition wall member 130 serves as a wall for separating or isolating the battery modules 200, and heat transfer between the battery modules 200 necessarily involves the partition wall member 130.

[0053] Figure 2 is from Figure 1 A cross-sectional view of a battery pack housing 100 with one crossbeam 150 removed. For reference, Figure 2 is an example of the partition wall member 130, but Figure 2 The same structure shown can be applied to the center beam 140. Figure 2 , the cross beam 150 as the partition wall member 130 has a fire extinguishing pad 170 exposed on one surface of the cross beam 150, and the fire extinguishing pad 170 has a fire extinguishing agent 176 built therein.

[0054] The fire extinguishing pad 170 exposed on one side surface of the beam 150 is connected to the Figure 1 The fire extinguishing pad 170 contacts the battery modules 200 in the multiple accommodation spaces in the battery pack housing 100. In other words, the fire extinguishing pad 170 receives heat from the battery module 200 mainly in the form of conductive heat transfer. If thermal runaway occurs in any battery cell 210 including the battery module 200 and the thermal runaway is in an abnormally high temperature state, the fire extinguishing pad 170 provided in the partition wall member 130 will receive an abnormally large amount of heat, and will release the fire extinguishing agent 176 built therein in response to such heat. Through the release of the fire extinguishing agent 176, when the hot gases, particles and flames caused by the thermal runaway are cooled or extinguished, other battery modules 200 in the vicinity are thermally protected, and heat propagation is suppressed and delayed.

[0055] The partition wall member 130 of the present invention is configured to have a built-in fire extinguishing pad 170 containing a fire extinguishing agent 176, and therefore, the battery pack housing 100 does not need to provide a separate space and device for accommodating and releasing the fire extinguishing agent 176. This means that by applying the partition wall member 130 of the present invention, the heat propagation problem can be effectively offset without changing the overall design of the battery pack housing 100 and without sacrificing the capacity of the battery pack 10.

[0056] Figure 3 is a cross-sectional view of a fire extinguishing mat 170 according to one embodiment. Referring to the accompanying drawings, the fire extinguishing mat 170 includes a porous mat 172, a plurality of capsules 174 built into the porous mat 172, and a liquid fire extinguishing agent 176 sealed in the capsules 174. Sealing the liquid fire extinguishing agent 176 in the capsules 174 is a method of reliably keeping the fire extinguishing agent 176 in the fire extinguishing mat 170 until a thermal runaway event occurs, and in particular, the use of the liquid fire extinguishing agent 176 is advantageous because the liquid fire extinguishing agent 176 occupies a small space due to its explosive expansion in volume through vaporization, but can be expected to effectively extinguish a fire. In addition, the porous mat 172 acts as a container for the capsules 174 because it contains a plurality of holes and is suitable for the release of the vaporized fire extinguishing agent 176.

[0057] For example, the preferred liquid fire extinguishing agent 176 can be a fluorinated ketone. Fluorinated ketone is a substance artificially made by replacing hydrogen atoms in ketones with fluorine. It is colorless and odorless, and its viscosity is almost the same as that of water, so it is easy to put into the capsule 174, and because fluorine has stable characteristics, its insulation capacity is more than twice that of nitrogen, so it is non-conductive, and it will not react with substances in contact with it, such as oxidation, and its surface tension is very small, so when it contacts an object, it diffuses well without forming droplets, so it is very suitable for fire extinguishing. In addition, fluorinated ketones are non-toxic and harmless to the human body because they can extinguish fires. They are effective fire extinguishing agents that evaporate quickly when in contact with fire or smoke, quickly taking away heat, and because they do not leave any residue after evaporation, they are more environmentally friendly than traditional fire extinguishing substances. In particular, the non-conductivity caused by the stability of fluorine is suitable for dealing with fires in the battery pack 10 caused by thermal runaway of secondary batteries.

[0058] However, since the boiling point of fluorinated ketones is 49°C, which is much lower than that of water, they exist in liquid form at room temperature, but when the temperature rises, they evaporate rapidly. Therefore, it is necessary to design the capsule 174 containing the liquid fluorinated ketone and the porous pad 172 wrapping the capsule 174 so that the material, thickness, etc. of the capsule 174 serve as appropriate insulating materials. For example, the capsule 174 can be designed so that when the temperature of the fire extinguishing pad 170 in contact with the battery module 200 is in the temperature range of 120°C to 220°C, the capsule 174 can melt, and / or the vapor pressure of the fire extinguishing agent 176 vaporized therein can cause the capsule 174 to rupture and release the fire extinguishing agent 176. The fire extinguishing agent 176 released from the capsule 174 can be released to the outside through the holes of the porous pad 172, thereby providing an early response to a fire in the battery module 200.

[0059] Refer again Figure 1 , the partition wall member 130 has a plurality of regularly aligned groove structures 132 on its surface, and the fire extinguishing mat 170 is fixed in the groove structure 132. Here, Figure 1 The regular groove structure 132 is shown in the form of a plurality of hexagonal grooves that are regularly aligned to form a honeycomb structure 134. The honeycomb structure 134 is a dense structure in which each side of a hexagon (e.g., a regular hexagon) overlaps one side of another hexagon, such that, except for the corners, the perimeter of one hexagon is surrounded by six other hexagons in a regular arrangement.

[0060] The honeycomb structure 134 is a particularly representative structure having high rigidity compared to the volume. By having the honeycomb structure 134 on the surface of the partition wall member 130 of the present invention, it is possible to have space for a plurality of built-in fire extinguishing pads 170 while maintaining the high rigidity of the partition wall member 130. This means that there is no need to thicken the partition wall member 130 in order to accommodate a sufficient number of fire extinguishing pads 170 while maintaining mechanical rigidity, which can effectively suppress and delay heat propagation while reducing the weight of the partition wall member 130 and the battery pack housing 100 contained therein.

[0061] Figure 4 1 is a drawing showing an alternative embodiment of a partition wall member 130, wherein the groove structure 132 in the illustrated embodiment is provided as a honeycomb structure 134 on both sides of the partition wall member 130. The honeycomb structure 134 is lightweight, so that the partition wall member 130 can be slightly thickened while forming the honeycomb structure 134, and fire extinguishing pads 170 are installed on both sides thereof to better cope with fire in the battery module 200.

[0062] Here, the honeycomb structures 134 disposed on each side of the partition wall member 130 may not be connected to each other, in which case the honeycomb structures 134 located on either side of the partition wall member 130 may be disposed with respect to each other at a half pitch P in the longitudinal and / or transverse direction. The pitch refers to the longitudinal or transverse spacing between the hexagons that are regularly arranged to form the honeycomb structures 134, so that the honeycomb structures 134 located on both sides of the partition wall member 130 do not overlap with each other, but are staggered with each other at a half pitch (P) in the longitudinal and / or transverse direction, and therefore, the rigidity of the partition wall member 130 as a whole is further enhanced by the honeycomb structures 134 staggered like a net. Figure 4 The partition wall member 130 exemplarily shown illustrates an embodiment in which the honeycomb structures 134 on both sides thereof are longitudinally arranged at a half pitch (P) to each other.

[0063] [Second Embodiment]

[0064] Figure 5 and Figure 6 Embodiments in which the fire extinguishing mat 170 is installed on the partition wall member 130 are respectively shown.

[0065] Figure 5 An embodiment of the present invention relates to a method in which a fire extinguishing mat 170 conforming to the shape of a groove structure 132 provided in a partition wall member 130 is separately prepared, and then the fire extinguishing mat 170 is inserted into the groove structure 132, such as by bonding or fitting.

[0066] For example, the fire extinguishing mat 170 may be produced using a foaming molding technique, in other words, a porous mat 172 having a plurality of holes built therein may be produced by mixing a foaming agent in a thermoplastic resin or the like or by injecting a gas such as nitrogen or the like during the molding process. In this case, a foaming agent 174 sealed with a liquid fire extinguishing agent 176 may be mixed in a resin for molding and foamed to produce a foaming agent such as a fire extinguishing agent 176. Figure 3 The fire extinguishing mat 170 of the structure shown. By making the mold for foam molding in the form of the groove structure 132 provided in the partition wall member 130, the fire extinguishing mat 170 can be made to have a precise size and shape.

[0067] Figure 6An embodiment is schematically shown in which the fire extinguishing pad 170 is installed using the partition wall member 130 itself, wherein the groove structure 132 is formed as a mold, without the need to prepare a separate mold. By using the partition wall member 130 as a mold, the mold cost is saved, and the partition wall member 130 having the fire extinguishing pad 170 that fits perfectly into the groove structure 132 of the partition wall member 130 can be manufactured without going through a separate assembly process. In particular, when a plurality of groove structures 132 are provided through the rib 134, or when the shape of the groove structure 132 is complicated, or when the shapes of the plurality of groove structures 132 are different, Figure 6 An embodiment of the invention is also an advantageous embodiment.

[0068] [Third Embodiment]

[0069] Figure 7 is a diagram showing a battery pack case 100 including a partition wall member 130 according to a first embodiment of the present invention.

[0070] The battery pack housing 100 shown includes a bottom plate 110 forming a lower surface, a side plate 120 surrounding the periphery of the bottom plate 110, a first embodiment of a partition wall member 130 longitudinally and / or laterally arranged to divide the accommodating space defined by the side plate 120, and a lead 160 for closing the upper surface of the accommodating space.

[0071] The partition wall member 130 described in detail above may be connected to the upper surface of the bottom plate 110 by laser welding, burning, etc., or may be connected by bolts, etc. Figure 7 In the illustrated embodiment, the partition wall member 130 of the first embodiment forms the cross beam 150 of the battery pack case 100. Obviously, the partition wall member 130 of the first embodiment may also be used as the center beam 140, as described above.

[0072] Figure 8 is shown with an installation Figure 7 FIG. 1 is a diagram of an embodiment of a battery pack 10 having a battery module 200 in a battery pack housing 100. The crossbars 150 having the fire extinguishing pads 170 are aligned so that the fire extinguishing pads 170 face the same direction so that each battery module 200 is assigned a fire extinguishing pad 170 (see FIG. 1 ). Figure 7 and Figure 8). By assigning a fire extinguishing pad 170 to each battery module 200, if thermal runaway occurs in any battery module 200, the fire extinguishing pad 170 assigned to the battery module 200 will generate a thermal reaction by spraying the vaporized fire extinguishing agent 176 to actively suppress the thermal runaway. Since the temperature of the battery module 200 is lowered by spraying the fire extinguishing agent 176, the thermal runaway is delayed, and when the battery pack 10 is viewed as a whole, the delay effect of the thermal runaway is maintained for as long as possible by causing the fire extinguishing pad 170 to react in sequence along the direction of the progression of the thermal runaway.

[0073] Fig. 9 is shown with an installation Figure 7 FIG. 1 is a diagram of another embodiment of a battery pack 10 having a battery module 200 in a battery pack housing 100. Figure 8 The difference of the embodiment is that fire extinguishing pads 170 are provided on both sides of the crossbeam 150. By having the fire extinguishing pads 170 on both sides of the battery module 200, when a fire occurs in any battery module 200, more effective fire extinguishing is achieved by doubling the amount of fire extinguishing agent 176 used to solve the problem. Although Fig. 9 An embodiment is shown where two partition wall members 130 with fire extinguishing pads 170 on one side are stacked to form a single cross member 150, but it should be understood that Fig. 9 The implementation method can be achieved by using Figure 4 The single partition wall member 130 with fire extinguishing pads 170 on both sides described in the embodiment is realized by forming a crossbeam 150.

[0074] As described above, the present invention has been described in more detail through the drawings and embodiments. However, since the configuration described in the drawings or the embodiments described herein are only one embodiment of the present invention and do not represent the overall technical spirit of the present invention, it should be understood that when submitting this application, the present invention covers various equivalents, modifications and substitutions.

[0075] [Explanation of Reference Numerals]

[0076] 10: Battery Pack

[0077] 100: Battery pack housing

[0078] 110: Base plate

[0079] 120: Side panels

[0080] 130: Partition wall component

[0081] 132: Groove structure

[0082] 134: Honeycomb structure

[0083] 140: Center beam

[0084] 150: beam

[0085] 160: Lead

[0086] 170: Fire extinguishing mat

[0087] 172: Porous pad

[0088] 174: Capsules

[0089] 176: Fire extinguishing agent

[0090] 200: Battery module

[0091] 210: Battery cells

[0092] P: Pitch

Claims

1. A partition wall member installed between a plurality of battery modules installed in a battery pack, At least one side surface of the partition wall member includes a plurality of regularly aligned groove structures, wherein: The plurality of groove structures are equipped with fire extinguishing mats having a fire extinguishing agent built therein.

2. The partition wall member according to claim 1, wherein The fire extinguishing mat includes a porous mat, a plurality of capsules built into the mat, and a liquid fire extinguishing agent sealed in the capsules.

3. The partition wall member according to claim 2, wherein The liquid fire extinguishing agent is a fluorinated ketone.

4. The partition wall member according to claim 3, wherein When the temperature of the fire extinguishing mat is within a temperature range of 120° C. to 220° C., the capsules rupture due to melting or due to internal steam pressure, thereby releasing the fire extinguishing agent.

5. The partition wall member according to claim 4, wherein The fire extinguishing agent released from the capsule is released to the outside through the holes of the porous pad.

6. The partition wall member according to claim 1, wherein The plurality of groove structures form a honeycomb structure having a plurality of regularly aligned hexagonal grooves.

7. The partition wall member according to claim 6, wherein The honeycomb structure is provided on each of both sides of the partition wall member.

8. The partition wall member according to claim 7, wherein The honeycomb structures respectively provided on both sides of the partition wall member are not connected to each other, The honeycomb structures respectively provided on both sides of the partition wall member are staggered from each other by a half pitch in the longitudinal direction and / or the transverse direction.

9. A battery pack housing, comprising: Base plate; A side panel surrounding the periphery of the bottom panel; The partition wall member according to any one of claims 1 to 8, wherein the partition wall member is longitudinally and / or transversely arranged to divide the accommodation space defined by the side plate; as well as A lead is provided to seal the upper surface of the accommodation space.

10. The battery pack housing according to claim 9, wherein: The partition wall member is a crossbeam.

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