Battery pack with gas vent path

Abstract

The battery pack according to the present invention includes a plurality of battery modules and a pack case that houses the plurality of battery modules. The pack case includes an internal space for housing the battery modules, a pack tray provided so that the upper part is open, and a pack cover that covers the upper part of the pack tray, is coupled to the pack tray, and incorporates a gas vent path that communicates with each of the battery modules.

Description

Technical Field

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack provided with a gas vent path that prevents gas ejected from a battery module when a thermal event occurs in the battery module from being transmitted to other battery modules and allows the gas to be smoothly discharged to the outside of the pack case.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0126569 filed on October 4, 2022, and all of the content disclosed in the specification and drawings of the application is incorporated herein.

Background Art

[0003] Secondary batteries not only have the primary advantage of significantly reducing the use of fossil fuels, but are also environmentally friendly in that they do not generate any by-products due to energy use, and are attracting attention as a new energy source for improving energy efficiency.

[0004] Along with this, the application of secondary batteries to various devices is increasing. For example, it is widely used as an energy source for wireless mobile devices or wearable devices, which are multifunctional small products, and is also used as an energy source or an electric energy storage system (ESS) for electric vehicles and hybrid electric vehicles proposed as alternatives to existing gasoline vehicles and diesel vehicles.

[0005] In recent years, commonly used lithium secondary batteries have an operating voltage of about 2.5V to 4.5V per cell. Therefore, in the case of electric vehicles and electric energy storage systems that require high capacity and high output, a battery module in which a plurality of lithium secondary batteries are connected in series and / or in parallel, and a battery pack in which the battery modules are connected in series and / or in parallel are configured and used as an energy source.

[0006] Depending on the output and capacity of the battery pack required for an electric vehicle, the number of lithium-ion batteries in a single battery module may increase, or the number of battery modules in a single battery pack may increase.

[0007] However, battery packs containing multiple lithium-ion batteries like these are even more vulnerable to fire and explosion.

[0008] For example, if an event such as a short circuit between lithium secondary batteries or an abnormal temperature rise occurs in some battery modules, a large amount of vent gas will be generated in the lithium secondary batteries. If the degradation becomes severe, high-temperature particles (or sparks) containing electrode active material and aluminum particles may be ejected along with the vent gas. In this case, the vent gas and particles will cause thermal damage to adjacent battery modules, which greatly increases the risk of further thermal events occurring in other battery modules.

[0009] Therefore, when a thermal event occurs in a battery module, it is necessary to prevent the gas and particles ejected from that battery module from spreading to other battery modules. Also, if the amount of gas inside the battery pack increases, the pressure could cause the battery pack to structurally collapse or explode, so it is necessary to smoothly vent the gas to the outside. [Overview of the project] [Problems that the invention aims to solve]

[0010] This invention was devised to solve the above-mentioned technical problems, and aims to provide a battery pack that prevents gases and particles ejected from a battery module when a thermal event occurs in the battery module from propagating to other adjacent battery modules, and in particular, enables smooth discharge of gases to the outside of the pack case.

[0011] The technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description of the invention. [Means for solving the problem]

[0012] The battery pack according to the present invention includes a plurality of battery modules and a pack case for housing the plurality of battery modules, wherein the pack case may include a pack tray having an internal space for housing the battery modules and provided with an open top, and a pack cover that covers the top of the pack tray and is coupled to the pack tray, and incorporates a gas vent path that communicates with each of the battery modules.

[0013] The gas vent path may include at least one first vent path extending in a first direction, and at least one second vent path extending in a second direction intersecting the first direction and communicating with the at least one first vent path.

[0014] The first vent paths are plurality and include two outer paths located in the regions of opposing edges of the pack cover and extending in the first direction, and at least one inner path located between the two outer paths and extending in the first direction, wherein the at least one second vent path may be configured to intersect the two outer paths and the inner path.

[0015] The gas vent path may further include a mesh filter in the portion where the first vent path and the second vent path intersect.

[0016] The mesh size of the mesh filter can become smaller as it approaches the outlet of the gas vent path.

[0017] Each of the battery modules is provided with a gas vent hole on its upper surface, and the pack cover may be provided with a connecting pipe that connects the gas vent hole to the gas vent path.

[0018] The gas vent hole may be covered with a packing member designed to rupture above a certain pressure.

[0019] The pack cover includes a tray connection portion provided so as to protrude outward from one end of the first vent path, and the pack tray may include a gas outlet through which gas is discharged to the outside, a connecting groove portion provided so as to be able to fit and connect with the tray connection portion, and a duct portion provided inside the body of the pack tray so as to communicate between the connecting groove portion and the gas outlet.

[0020] The pack tray may be configured to include at least one first partition wall that divides the internal space, and the pack cover may be configured to include a second partition wall that fits and connects with the first partition wall, such that adjacent battery modules are spatially separated by the first and second partition walls.

[0021] The first partition wall may have an upper end groove formed by recessing a predetermined depth from the upper end surface, and the second partition wall may have an insertion portion provided so as to be insertable into the upper end groove.

[0022] The insertion portion may include a recess that is recessed inward, and the upper end groove may include a pressing portion that is provided to conform to the shape of the recess when the insertion portion is sandwiched in the upper end groove.

[0023] The gas vent path may include a plurality of unit gas vent paths that communicate one-to-one with a plurality of the battery modules.

[0024] In another aspect of the present invention, an automobile including the battery pack described above may be provided. [Effects of the Invention]

[0025] According to one aspect of the present invention, when a thermal event occurs in a battery module, it is possible to provide a battery pack that prevents gas and particles ejected from the battery module from being transmitted to other adjacent battery modules and that can smoothly discharge the gas to the outside of the pack case.

[0026] In particular, in the battery pack according to one aspect of the present invention, a gas vent path is provided in a pack cover that covers the upper part of the battery module, and the gas vent path branches into a plurality of paths. Therefore, even if particles accumulate in such a gas movement path and obstruct the gas flow in the gas movement path, the gas can escape to other gas movement paths.

[0027] Also, a mesh filter is applied to each region where the gas vent paths intersect, and by applying a mesh filter with a smaller mesh size closer to the outlet side of the gas vent path, it becomes difficult for particles to escape to the outside of the battery pack.

[0028] The effects of the present invention are not limited to the effects described above, and other effects of the present invention not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the present specification and the accompanying drawings.

Brief Description of the Drawings

[0029] [Figure 1] It is an assembled perspective view of a battery pack according to an embodiment of the present invention. [Figure 2] It is a perspective view schematically showing the configuration of the battery pack with the pack tray and the pack cover of FIG. 1 separated. [Figure 3] It is a view schematically showing a cross-sectional view of the battery pack taken along line A-A' of FIG. 1. [Figure 4] It is a view schematically showing a longitudinal cross-section of the battery pack of FIG. 1. [Figure 5] It is an enlarged view of region B in FIG. 4. [Figure 6]This figure shows modified examples of the first and second partitions in Figure 5. [Figure 7] This figure schematically shows a cross-section of a battery pack according to another embodiment of the present invention. [Figure 8] This is a magnified view of a portion of the gas vent path shown in Figure 7. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather in a manner appropriate to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concepts of terms in order to best describe the invention. Accordingly, it should be understood that the embodiments and configurations shown in the drawings described herein are merely the most preferred embodiments of the present invention and do not represent the entirety of the technical idea of ​​the present invention, and that there may be a variety of equivalents and modifications that can be substituted therein at the time of this application.

[0031] Figure 1 is a combined perspective view of a battery pack according to one embodiment of the present invention; Figure 2 is a schematic perspective view showing the configuration of the battery pack with the pack tray and pack cover separated from Figure 1; Figure 3 is a schematic cross-sectional view of the battery pack along line A-A' in Figure 1; and Figure 4 is a schematic longitudinal cross-sectional view of the battery pack in Figure 1.

[0032] Referring to Figures 1 to 4, a battery pack 10 according to one embodiment of the present invention includes a plurality of battery modules 100 and a pack case, the pack case 200 being provided with gas vent paths 221 and 222 communicating with each battery module 100. The gas vent paths 221 and 222 are passages for discharging vent gas to the outside of the pack case 200 when a thermal event occurs in any of the battery modules 100 included in the battery pack 10.

[0033] The battery pack 10 according to the present invention may have gas vent paths 221 and 222 configured to minimize thermal damage to other battery modules 100 during the process of venting gas to the outside of the pack case 200, and to prevent high-temperature particles (such as fragments of electrode plates or active material ejected from battery cells) from escaping to the outside of the battery pack 10, thereby preventing the high-temperature particles from becoming an ignition source outside the battery pack 10. The configuration of the pack case 200 equipped with such gas vent paths 221 and 222 will be described in detail below.

[0034] A pack case 200 according to one embodiment of the present invention includes a pack tray 210 and a pack cover 220 that are interconnected. As shown in Figures 1 and 2, the pack tray 210 may have an internal space for housing a plurality of battery modules 100 and be provided with an open top.

[0035] For example, the pack tray 210 may include a base portion 211 that supports the lower part of the battery module 100, and a wall portion that forms a wall along the outer edge of the base portion 211. The base portion 211 is provided in a substantially rectangular plate shape, and the wall portion may include a first wall, a second wall, a third wall, and a fourth wall that form a wall along the outer edge of the rectangular plate-shaped base portion 211. For example, in the embodiment of Figure 2, the wall portion may include a first wall 212 in the +X direction, a second wall 213 in the -Y direction, a third wall 214 in the -X direction, and a fourth wall 215 in the +Y direction. The pack cover 220 covers the upper part of the pack tray 210 and may be provided so as to be connectable to the pack tray 210.

[0036] In particular, the pack cover 220 according to this embodiment is equipped with gas vent paths 221 and 222 inside. In other words, the gas vent paths 221 and 222 can be provided so as to be built into the frame forming the pack cover 220, as shown in Figure 3. By building the gas vent paths 221 and 222 into the pack cover 220 in this way, the space in which the battery module 100 is arranged and the space in which the vent gas moves can be separated inside the pack case 200. In particular, by building the gas vent paths 221 and 222 into the pack cover 220, which has a large surface area, the vent gas discharge path can be diversified, and the volume of the area in which the gas can move or the overall passage can also be increased. Therefore, the gas vent path of the present invention has the effect of smoothly discharging vent gas to the outside of the battery pack even if a large amount of vent gas is generated.

[0037] Furthermore, since the vent gas generated in any battery module 100 is configured to move along a gas vent path built into the pack cover 220, it does not flow into the space where the battery module 100 is located. Therefore, since the vent gas does not come into direct contact with other battery modules 100, the other battery modules 100 are less susceptible to thermal damage.

[0038] The battery module 100 may include a battery cell 110 and a module housing that houses the battery cell 110. The battery cell 110 can be any form of secondary battery, such as a prismatic secondary battery, a cylindrical secondary battery, or a pouch-type secondary battery, and the module housing may be made of a mechanically rigid material, preferably a metal material, that can protect the battery cell 110 from external shocks and vibrations.

[0039] Each battery module 100 is arranged in a pack tray 210, as shown in Figure 2, and may have a gas vent hole 121 on its upper surface. Each battery module 100 may be configured such that the gas vent hole 121 is individually connected to a gas vent path in the pack cover 220.

[0040] The upper surface of the battery module 100 refers to the upper plate of the module housing that covers the top of the battery cell 110, and the gas vent hole 121 may be formed by partially cutting or perforating the upper plate of the module housing. For example, if there is a problem of ignition due to a short circuit or overcharging of the battery cell 110, flames, hot particle and vent gas may be generated in the battery cell 110. In this case, the vent gas can be discharged from the inside to the outside of the battery module 100 through the gas vent hole 121. A packing member 122 may be attached to the gas vent hole 121. The packing member 122 seals the gas vent hole 121 under normal circumstances, preventing foreign matter from entering the inside of the battery module 100 housing from the outside.

[0041] The packing member 122 may be made of a material that ruptures above a certain pressure or melts due to heat, such as plastic. That is, in the event of an internal fire in the battery module 100, the gas vent hole 121 is opened when the plastic packing member 122 disappears due to gas pressure or heat.

[0042] The gas vent hole 121 may be configured to communicate with a gas vent path of the pack cover 220. For this purpose, the pack cover 220 may further include a connecting pipe 225 that connects the gas vent hole 121 and the gas vent path. The connecting pipe 225 may be configured, for example, to be flexible and expandable in a bellows form.

[0043] As shown in Figures 3 and 4, the pack cover 220 may be equipped with a connecting tube 225, which may be configured to match vertically with the gas vent hole 121 of the corresponding battery module 100 when coupled to the pack tray 210. The connecting tube 225 may be configured so that one end communicates with the gas vent path and the other end protrudes from the surface of the pack cover 220 to cover the gas vent hole 121 of the battery module 100.

[0044] With this configuration, when a thermal event occurs, the vent gas from each battery module 100 can flow completely into the gas vent path of the pack cover 220. This prevents the transfer of the vent gas to other battery modules 100 in the vicinity.

[0045] Referring further to Figure 3, the gas vent path of the pack cover 220 according to one embodiment of the present invention includes at least one first vent path 221 extending in a first direction (X direction) and at least one second vent path 222 extending in a second direction (Y direction) intersecting the first direction and communicating with the at least one first vent path 221.

[0046] The first vent path 221 may be a plurality of paths, including two outer paths 221a, 221b located on opposing edges of the pack cover 220 and extending in the first direction, and at least one inner path 221c located between the two outer paths 221a, 221b and extending in the first direction.

[0047] The second vent path 222 may be configured to extend in a second direction (Y direction) that intersects the two outer paths 221a, 221b and inner path 221c, and to communicate with each other at the intersecting portion. There may be multiple such second vent paths 222, and these multiple second vent paths 222 may be configured at regular intervals along the first direction. In this embodiment, the pack cover 220 has three second vent paths 222a, 222b, and 222c along the first direction (X direction) at intervals corresponding to the width of the battery module 100, but the scope of the present invention is not limited thereto. That is, for example, the pack cover 220 may be configured to house two or more second vent paths 222.

[0048] With this configuration, the paths through which the vent gas can travel to the gas outlet 219 of the battery pack 10 become more diverse. That is, the vent gas can travel not only along the two outer paths 221a and 221b at both edges of the pack cover 220, but also along multiple second vent paths 222 that intersect with the two outer paths 221a and 221b. For example, if a large amount of particle accumulates in a particular part of the gas vent path, the flow of the vent gas may be obstructed. However, with the gas vent path configuration according to this embodiment, the paths through which the vent gas can travel become more diverse, allowing it to avoid areas where particle has accumulated and travel through other paths.

[0049] In particular, a large-capacity battery pack 10 contains a large number of battery modules 100. When vent gas and particle generation occurs simultaneously in one or more battery modules 100 contained in such a large-capacity battery pack 10, a gas vent path that utilizes the wide area of ​​the pack cover 220 to configure various gas movement paths is effective in order to smoothly and quickly discharge the vent gas, as in this embodiment.

[0050] As shown in Figures 3 and 4, the gas vent path may further include a mesh filter 223 at the intersection of the first vent path 221 and the second vent path 222. When high-temperature particles are discharged outside the battery pack 10, they can become an ignition source outside the battery pack 10. In this case, the mesh filter 223 plays a role in blocking the movement of particles and preventing them from being discharged outside the battery pack 10. In particular, in this embodiment, mesh filters 223a, 223b, and 223c can be applied to the gas vent path with smaller mesh openings closer to the outlet of the gas vent path, i.e., the gas outlet 219. With this configuration, when the vent gas and particles move together as indicated by the arrows in Figure 4, the particles can be filtered n times (where n is a natural number) or more. Furthermore, since the mesh sizes of the mesh filters 223a, 223b, and 223c are configured to decrease sequentially, it is possible to effectively distribute the amount of particles accumulating in the gas vent path between one mesh filter 223 and another mesh filter 223 according to their size. In addition, as the particles pass through the mesh filters 223, they exchange heat with the metal mesh filters, causing their temperature to decrease, and ultimately, only low-temperature ultrafine particles are discharged to the outside of the battery pack 10.

[0051] Referring further to Figures 2, 3, and 4, the pack cover 220 includes a tray connection portion 226 provided so as to protrude outward from one end of the first vent path 221, and the pack tray 210 may include a gas outlet 219 through which gas is discharged to the outside, a connecting groove portion 217 provided so as to be able to fit and connect with the tray connection portion 226, and a duct portion 218 provided inside the body of the pack tray 210 so as to communicate between the connecting groove portion 217 and the gas outlet 219.

[0052] For example, as shown in Figure 2, connecting grooves 217 may be provided in the corner regions of the pack tray 210 where the first wall 212 and the second wall 213, and the first wall 212 and the fourth wall 215 intersect, as well as in the central region of the first wall 212. A tray connecting portion 226 may be configured to protrude downward from the surface of the pack cover 220 so as to be able to fit into and release the connecting grooves 217 in the vertical direction.

[0053] The tray connection portion 226 may be configured to correspond to the number of first vent paths 221 and to communicate with the first vent paths 221. For example, as shown in Figure 3, tray connection portions 226 may be provided at one end of two outer paths 221a, 221b and at one end of one inner path 221c. On the other hand, although this embodiment has only one inner path 221c, unlike this embodiment, the pack cover 220 may have two or more inner paths 221c, and a tray connection portion 226 may be provided at one end of each inner path 221c.

[0054] The tray connection portion 226 of the pack cover 220 and the connecting groove portion 217 of the pack tray 210 can be connected by an interference fit when the pack cover 220 and the pack tray 210 are joined together, as shown in Figure 4. The connecting groove portion 217 of the pack tray 210 can be configured to communicate with a gas outlet 219 via a duct portion 218 built into the first wall 212 of the pack tray 210, as shown by the hidden line in Figure 3. With this configuration, the gas vent path of the pack cover 220 communicates with the gas outlet 219 of the pack tray 210, and the vent gas is ultimately discharged from the gas outlet 219 to the outside of the battery pack 10.

[0055] On the other hand, in one embodiment of the present invention, the battery pack 10 may be configured such that the internal space of the pack case 200 is partitioned in order to block thermal transfer between battery modules 100 when a thermal event occurs. For this purpose, the pack tray 210 is provided with at least one first partition wall 216 that partitions the internal space, and the pack cover 220 is provided with a second partition wall 224 that fits and connects with the first partition wall 216, and when the pack cover 220 and the pack tray 210 are connected as shown in Figure 4, the battery modules 100 adjacent to each other may be configured to be spatially separated by the first partition wall 216 and the second partition wall 224.

[0056] Referring more specifically to Figures 4 and 5, the first partition wall 216 of the pack tray 210 has an upper end groove portion 216a formed by recessing a predetermined depth from the upper end surface, and the second partition wall 224 of the pack cover 220 may have an insertion portion 224a provided to be insertable into the upper end groove portion 216a. Therefore, when the pack cover 220 and the pack tray 210 are coupled together, the first partition wall 216 and the second partition wall 224 are connected, and the internal space of the pack case 200 can be divided into multiple sections. For example, the space between the side portion 120A of the module case of one battery module 100 and the side portion 120B of another battery module 100 can be blocked by the interlocking first partition wall 216 and the second partition wall 224. Therefore, if a thermal event occurs in one of the battery modules 100, the thermal transfer to the adjacent other battery module 100 can be delayed to the greatest extent possible.

[0057] Figure 6 shows a modified example of the first partition wall 216 and the second partition wall 224 of Figure 5, illustrating how the fastening force between the first partition wall 216 and the second partition wall 224 has been reinforced. In the configuration shown in Figure 6, the insertion portion 224a of the second partition wall 224 is provided with a recessed portion 224b that is recessed inward, and the upper end groove portion 216a of the first partition wall 216 is provided with a pressing portion 216b that is shaped to match the recessed portion 224b.

[0058] When the insertion portion 224a of the second partition wall 224 is completely sandwiched in the upper end groove portion 216a of the first partition wall 216, the recess 224b and the pressing portion 216b can be aligned, as shown in Figure 6. Since the recess 224b is difficult to dislodge from the pressing portion 216b unless the pressing portion 216b is opened to create space, this structure can be advantageous in strengthening the fastening force between the first partition wall 216 and the second partition wall 224.

[0059] Figure 7 is a schematic cross-sectional view of a battery pack 10 according to another embodiment of the present invention, and Figure 8 is a partially enlarged view of the gas vent path in Figure 7.

[0060] The same component numbers as in the previously described embodiment refer to the same components, and redundant explanations of the same components will be omitted. The explanation will focus on the differences from the previously described embodiment.

[0061] A gas vent path according to another embodiment of the present invention may include a plurality of unit gas vent paths 228a, 228b, 228c, and 228d that communicate one-to-one with a plurality of the battery modules 100.

[0062] In the case of the battery pack 10 according to other embodiments of the present invention, as in the embodiments described above, the gas vent path may be built into the pack cover 220 and configured to communicate with each battery module 100. However, in the other embodiments of the present invention, the gas movement path corresponding to the inner path 221c and the second vent path 222 of the first vent path 221 in the embodiments described above is omitted. Furthermore, in the embodiments described above, the outer paths 221a and 221b of the first vent path 221 are configured to communicate with multiple battery modules 100, but in the other embodiments of the present invention, as shown in Figures 7 and 8, the gas vent path is configured to communicate individually with one of the unit gas vent paths 228a, 228b, 228c, and 228d for each battery module 100.

[0063] According to the gas vent path configuration of this other embodiment of the present invention, the vent gas generated in each battery module 100 can travel along each unit gas vent path 228a, 228b, 228c, 228d and be discharged to the outside of the battery pack 10 through the gas outlet 219.

[0064] Therefore, for example, vent gas generated in any one battery module 100 will move along the unit gas vent paths 228a, 228b, 228c, and 228d connected to any one battery module 100, making it extremely unlikely that it will flow into the interior of the other battery modules 100.

[0065] Furthermore, even if multiple battery modules 100 simultaneously emit vent gas and particle material, the particle material emitted from different battery modules 100 does not accumulate in different unit gas vent paths 228a, 228b, 228c, and 228d. Therefore, particle material does not accumulate excessively in each unit gas vent path 228a, 228b, 228c, and 228d. In addition, the vent gas from each battery module 100 moves along each unit gas vent path 228a, 228b, 228c, and 228d, resulting in smooth flow. The distance the vent gas travels to the gas outlet 219 is also shortened compared to the previously described embodiment, allowing the vent gas to be discharged to the outside of the battery pack 10 more quickly.

[0066] On the other hand, the battery pack according to the present invention is applicable to automobiles such as electric vehicles and hybrid vehicles. That is, an automobile according to the present invention may include the battery pack according to the present invention. The battery pack may be installed, for example, in the vehicle body frame under the seats or in the trunk space of the vehicle.

[0067] In this specification, terms indicating direction such as up, down, left, right, front, and back are used, but these terms are for the sake of convenience of explanation only, and it is obvious to those skilled in the art that the direction can change depending on the position of the object in question, the position of the observer, etc.

[0068] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that various modifications and variations are possible within the equivalent scope of the technical concept and claims of the present invention by persons with ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0069] 10 Battery Packs 100 Battery Modules 110 battery cells 120A Side section 120B Side part 121 Gas Vent Hole 122 Packing material 200 pack case 210 Pack Tray 211 Base section 212 1st wall 213 Second wall 214 Third wall 215 4th wall 216 1st bulkhead 216a Top groove 216b Pressing part 217 Connecting groove 218 Duct section 219 Gas outlet 220 Pack Cover 221 First Bento Path 221a Outer path 221b Outer Path 221c Inner Pass 222 Second Vent Path 222a Second Vent Path 222b Second Vent Path 222c Second Bend Path 223 Mesh Filter 223a Mesh filter 223b Mesh Filter 223c Mesh Filter 224 2nd bulkhead 224a Insertion section 224b recess 225 Connecting pipe 226 Tray connection section 228a Unit gas vent path 228b Unit gas vent path 228c Unit Gas Vent Path 228d Unit gas vent path

Claims

1. A battery pack comprising a plurality of battery modules and a pack case for housing the plurality of battery modules, The aforementioned pack case is A pack tray having an internal space for housing the aforementioned multiple battery modules and provided with an open top, The pack cover includes a pack cover that covers the top of the pack tray and connects to the pack tray, and incorporates a gas vent path that communicates with each of the battery modules, The gas vent path is, It includes at least one first vent path extending in a first direction, and at least one second vent path extending in a second direction intersecting the first direction and communicating with the at least one first vent path, The aforementioned first vent paths are multiple, The pack cover includes two outer paths located in the regions of opposing edges and extending in the first direction, and at least one inner path located between the two outer paths and extending in the first direction, The at least one second vent path is where the two outer paths and the inner path intersect. The pack tray is provided with at least one first partition wall that divides the internal space, The pack cover includes a second partition wall that fits and connects with the first partition wall, A battery pack characterized in that adjacent battery modules are configured to be spatially separated by the first partition and the second partition.

2. The gas vent path is, The battery pack according to claim 1, further comprising a mesh filter at the intersection of the first vent path and the second vent path.

3. The aforementioned mesh filters are multiple, The battery pack according to claim 2, characterized in that the mesh size of the mesh filter becomes smaller as it approaches the outlet of the gas vent path.

4. Each of the aforementioned battery modules is provided with a gas vent hole on its upper surface. The battery pack according to claim 1, characterized in that the pack cover comprises a connecting pipe that connects the gas vent hole and the gas vent path.

5. The battery pack according to claim 4, characterized in that the gas vent hole is covered with a packing member provided to rupture at a certain pressure or higher.

6. The aforementioned pack cover is The tray connection portion is provided so as to protrude from one end of the first vent path to the outside of the pack cover, The aforementioned pack tray is A gas outlet from which gas is discharged to the outside, A connecting groove portion is provided so as to be able to fit and connect with the tray connecting portion, The battery pack according to claim 1, further comprising a duct portion provided inside the main body of the pack tray such that the connecting groove portion and the gas outlet portion are in communication.

7. The battery pack according to claim 1, characterized in that the first partition wall has an upper end groove formed by recessing a predetermined depth from the upper end surface, and the second partition wall has an insertion portion provided so as to be insertable into the upper end groove.

8. The aforementioned insertion portion is provided with a recess that is recessed inward, The battery pack according to claim 7, characterized in that the upper groove portion includes a pressing portion provided so as to conform to the shape of the recess when the insertion portion is sandwiched in the upper groove portion.

9. An automobile characterized by including a battery pack according to any one of claims 1 to 8.

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