Battery pack

Abstract

To provide a battery pack having a structure where the influence of smoke exhaust from one of a first battery cell and a second battery cell to the other can be reduced.SOLUTION: The battery pack includes: a plurality of battery cells including first and second battery cells adjacent in a first direction; and a battery case housing the plurality of battery cells and including cross members which each are arranged between the first battery cell and the second battery cell and formed to extend in a second direction orthogonal to the first direction. The cross members each have a hollow structure and include a first opposite wall opposing to a first surface of the first battery cell and a second opposite wall opposing to a second surface of the second battery cell. The first battery cell includes a first smoke exhaust valve provided on the first surface. Similarly, the second battery cell includes a second smoke exhaust valve. The first opposite wall includes a first smoke exhaust hole provided at a position opposing to the first smoke exhaust valve and penetrating into an internal space. Similarly, the second opposite wall includes a second smoke exhaust hole. The battery pack further includes a shielding plate arranged in the internal space to shield between the first smoke exhaust hole and the second smoke exhaust hole.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a battery pack. [Background technology]

[0002] Patent Document 1 discloses a battery pack. This battery pack includes battery cells, a case that houses the battery cells, and an internal pressure adjustment membrane that exhausts gas inside the case to the outside. The case has a duct that protrudes from the bottom surface toward the outside of the case so as to surround the internal pressure adjustment membrane. The duct is connected to the vehicle reinforcement.

[0003] Moreover, Patent Document 2 discloses an electricity storage device that is provided with an exhaust port at one end of a discharge path for gas discharged from a gas discharge valve of a storage battery element. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-186040 A [Patent Document 2] Patent Publication No. 2021-068563 Summary of the Invention [Problem to be solved by the invention]

[0005] It is desirable for a battery pack having a plurality of battery cells including first and second battery cells arranged adjacent to each other via a cross member to have the following structure: That is, it is desirable for the battery pack to have a structure capable of reducing the effect of smoke exhausted from one of the first and second battery cells on the other.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a battery pack having a structure that can reduce the impact of smoke exhausted from one of the first and second battery cells on the other. [Means for solving the problem]

[0007] A battery pack according to the present disclosure includes a plurality of battery cells and a battery case. The plurality of battery cells include first and second battery cells adjacent to each other along a first direction. The battery case houses the plurality of battery cells and includes a cross member disposed between the first battery cell and the second battery cell and formed to extend in a second direction perpendicular to the first direction. The cross member has a hollow structure having an internal space and includes a first opposing wall facing a first surface of the first battery cell and a second opposing wall facing a second surface of the second battery cell. The first battery cell includes a first smoke exhaust valve provided on the first surface. The second battery cell includes a second smoke exhaust valve provided on the second surface. The first opposing wall includes a first smoke exhaust hole provided at a position facing the first smoke exhaust valve and penetrating into the internal space. The second opposing wall includes a second smoke exhaust hole provided at a position facing the second smoke exhaust valve and penetrating into the internal space. The battery pack further includes a shielding plate disposed in the internal space so as to shield the first smoke exhaust hole and the second smoke exhaust hole. Effect of the Invention

[0008] According to the battery pack according to the present disclosure, the influence of smoke exhausted from one of the first and second battery cells on the other can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing a basic configuration of a battery pack according to an embodiment; [Diagram 2] 2 is a cross-sectional view showing the configuration of a battery cell and its surroundings as viewed from a second direction D2 shown in FIG. [Diagram 3] 3 is a diagram for more specifically explaining the configuration of the shielding plate shown in FIG. 2. FIG. [Figure 4] 11 is a perspective view of a battery pack for explaining a second smoke exhaust structure in accordance with an embodiment of the present invention. FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along the line AA in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1. Basic configuration of the battery pack FIG. 1 is a diagram showing a basic configuration of a battery pack 1 according to an embodiment. FIG. 2 is a cross-sectional view showing a battery cell 10 and its surrounding configuration as viewed from a second direction D2 shown in FIG. 1. The battery pack 1 is mounted on an electric vehicle such as a battery electric vehicle (BEV). The "FR" direction shown in FIG. 1 corresponds to the forward direction of the vehicle in which the battery pack 1 is mounted. The "RH" direction corresponds to the rightward direction of the vehicle. Note that FIG. 2 corresponds to a normal state in which no smoke is emitted from a smoke exhaust valve 11 described below.

[0011] The battery pack 1 includes multiple battery cells 10 and a battery case 20. The battery case 20 houses the multiple battery cells 10. The battery case 20 includes a lower case 21 and an upper case 22 (see FIG. 2). FIG. 1 includes a view of the multiple battery cells 10 placed on the lower case 21 looking down from above the electric vehicle (the direction of "UPR" shown in FIG. 2), as well as an exploded perspective view for explaining the restraint structure for the multiple battery cells 10.

[0012] The plurality of battery cells 10 are, for example, rectangular cells. When a predetermined number of stacked battery cells 10 are referred to as a battery cell group 12, in the example shown in FIG. 1, a plurality of (for example, four) battery cell groups 12 are arranged as the plurality of battery cells 10 along a first direction D1. More specifically, each of the plurality of battery cells 10 is housed in the battery case 20 in a state in which it is placed on the lower case 21 without being modularized. In this manner, the battery pack 1 according to this embodiment has a so-called CTP (Cell To Pack) structure. The CTP structure does not require a structure associated with modularization, and therefore the space utilization rate and energy density of the battery pack 1 can be effectively improved.

[0013] In the example shown in Fig. 1, the first direction D1 is parallel to the vehicle front-rear direction. When the battery pack 1 is viewed from above as in Fig. 1, the first direction D1 is perpendicular to the second direction D2, which is the stacking direction of the battery cells 10 in each battery cell group 12. The second direction D2 is parallel to the vehicle left-right direction (vehicle width direction).

[0014] The lower case 21 includes a pair of side reinforcements 23 and a plurality of cross members 24 as members that reinforce the lower case 21. These side reinforcements 23 and cross members 24 are fixed to the main body of the lower case 21 so as to surround each of the plurality of battery cells 10 (each battery cell group 12).

[0015] More specifically, as shown in Fig. 1, the side reinforcements 23 are disposed on the outer sides of each end of the battery cell group 12 in the second direction D2 (vehicle width direction) and extend along the first direction D1 (vehicle front-rear direction). Some of the multiple cross members 24 are disposed between two battery cell groups 12 adjacent to each other in the first direction D1 and extend along the second direction D2. The rest of the multiple cross members 24 extend along the second direction D2 adjacent to the battery cell groups 12 located at each end of the first direction D1. Both ends of each cross member 24 are connected to a pair of side reinforcements 23, respectively.

[0016] In order to restrain the multiple battery cells 10 (each battery cell group 12) in the second direction D2 (stacking direction), the battery pack 1 has a hybrid restraint structure that integrally includes a cross member as a reinforcing member and a restraint band for the battery cell group 12 as the cross member 24.

[0017] Specifically, as shown in Fig. 1, each cross member 24 has an opposing wall 24a that faces the adjacent battery cell group 12. In addition, the cross member 24 located between two battery cell groups 12 in the first direction D1 has two opposing walls 24a (see Fig. 2). The cross member 24 is joined to the battery cell group 12 via an adhesive 30 applied to the opposing walls 24a.

[0018] Additionally, an engagement portion 24b is formed at each end of each cross member 24 in the second direction D2. The engagement portion 24b engages with an engagement portion 31a of the restraining member 31 on the battery cell group 12 side. The restraining member 31 is provided at each end of the battery cell group 12 in the second direction D2. By engaging the engagement portion 24b with the engagement portion 31a in a state in which a compressive load is applied to the battery cell group 12 along the second direction D2, the battery cell group 12 is restrained by the cross member 24 in the second direction D2 with a predetermined restraining force.

[0019] As described above, according to the hybrid restraint structure, the battery cell group 12 is restrained in the second direction D2 (stacking direction) by restraint using the adhesive 30 and mechanical restraint using the engagement portions 24b and 31a (double structure). This makes it possible to reduce the number of parts while effectively reducing the gap between the cross member 24 and the battery cell group 12, thereby realizing restraint in the second direction D2 in a space-efficient manner.

[0020] Furthermore, a restraint band 32 may be used to restrain the battery cell group 12 in the second direction D2. The restraint band 32 can restrain the battery cell group 12 from above as well by engaging engagement portions 32a at each end of the restraint band 32 with engagement portions 31b of the restraint member 31. Furthermore, to achieve more reliable restraint, the restraint band 32 may be joined to the upper surface 10a of each battery cell 10 included in the battery cell group 12 via an adhesive 33.

[0021] Next, the relationship between the battery cells 10 and the battery case 20 (lower case 21) will be described. As shown in FIG. 2, the lower surface 10b of each battery cell 10 is bonded to the lower case 21 via a thermally conductive adhesive 34. That is, each battery cell 10 is restrained from separating from the lower case 21 by the adhesive force of the thermally conductive adhesive 34. In addition, as shown in FIG. 2, each cross member 24 is disposed on the lower case 21 (more specifically, for example, the reinforcing member 25 included in the lower case 21). In order to more reliably restrain the assembly of the battery cell group 12 and the cross member 24, each cross member 24 may be fixed to the lower case 21 (reinforcing member 25) using fasteners such as bolts and nuts. Furthermore, by using the thermally conductive adhesive 34, when a cooler 40 is provided so as to contact the lower surface of the lower case 21 as in the example shown in FIG. 2, the thermally conductive adhesive 34 can be used to promote heat dissipation from the lower surface 10b of each battery cell 10.

[0022] Furthermore, to achieve more reliable restraint, the top surface 10a of each battery cell 10 may be joined to the upper case 22 via a thermally conductive adhesive 35, as in the example shown in Fig. 2. With this configuration, when a cooler 41 is provided so as to contact the top surface of the upper case 22 as in the example shown in Fig. 2, heat dissipation from the top surface 10a of each battery cell 10 can be promoted by using the thermally conductive adhesive 35. Note that, to restrain the side of the top surface 10a of each battery cell 10, only the thermally conductive adhesive 35 may be used without using the adhesive 33 in combination.

[0023] 2. First smoke exhaust structure Next, a smoke exhaust structure (first smoke exhaust structure) utilizing a cross member 24 will be described with reference to Figures 1 and 2. Here, for ease of description, of the multiple battery cells 10 included in the battery pack 1, one of two battery cells 10 adjacent to each other along the first direction D1 will be referred to as the "first battery cell 10_1" and the other as the "second battery cell 10_2." More specifically, in Figure 2, if the battery cell 10 located at the center of the page is regarded as the first battery cell 10_1, the two battery cells 10 located to the left and right of the first battery cell 10 each correspond to the second battery cell 10_2.

[0024] As shown in Fig. 2, the cross member 24 has a hollow structure with an internal space 24d, and more specifically, has, for example, a square cross section. Of the above-mentioned opposing walls 24a of the cross member 24, the surface facing the first surface 10c_1 of the first battery cell 10_1 is referred to as the "first opposing wall 24a_1," and the surface facing the second surface 10c_2 of the second battery cell 10_2 is referred to as the "second opposing wall 24a_2." The first surface 10c_1 corresponds to each of the two side surfaces of the first battery cell 10_1 that face the first direction D1. The same applies to the second surface 10c_2.

[0025] The first battery cell 10_1 has a first smoke exhaust valve 11_1 provided on the first surface 10c_1. More specifically, the first smoke exhaust valve 11_1 is provided on each of the two first surfaces 10c_1 of each first battery cell 10_1, for example. The position of each first smoke exhaust valve 11_1 in the vehicle up-down direction is, for example, a central position in the same direction. Similarly, the second battery cell 10_2 has a second smoke exhaust valve 11_2 provided on the second surface 10c_2. Thus, in the battery pack 1, the smoke exhaust valve (safety valve) 11 of each battery cell 10 faces the first direction D1, in other words, the horizontal direction. Note that a pair of positive and negative electrode terminals 13 of each battery cell 10 is installed on the upper surface 10a.

[0026] The first opposing wall 24a_1 of the cross member 24 has a first smoke exhaust hole 24c_1 provided at a position facing the first smoke exhaust valve 11_1. The first smoke exhaust hole 24c_1 penetrates into the internal space 24d. Similarly, the second opposing wall 24a_2 has a second smoke exhaust hole 24c_2 provided at a position facing the second smoke exhaust valve 11_2 and penetrating into the internal space 24d. In addition, when focusing on the battery cell group 12, as shown in FIG. 1, the smoke exhaust hole 24c, which is the first or second smoke exhaust hole 24c_1, 24c_2, is formed in the cross member 24 at a position facing the smoke exhaust valve 11 of each battery cell 10. The above-mentioned adhesive 30 is applied around the smoke exhaust hole 24c as shown in FIG. 1.

[0027] In addition, the battery pack 1 includes a shielding plate 26. The shielding plate 26 is disposed in the internal space 24d of the cross member 24 so as to block the gap between the first smoke exhaust hole 24c_1 and the second smoke exhaust hole 24c_2. More specifically, as shown in Fig. 2, the shielding plate 26 is disposed so as to stand upright from the inner bottom surface of the cross member 24 at a middle position (in other words, a neutral position) between the first smoke exhaust hole 24c_1 and the second smoke exhaust hole 24c_2 in the first direction D1. In the second direction D2, the shielding plate 26 is formed so as to extend from one end to the other end of the cross member 24.

[0028] In addition to Fig. 1 and Fig. 2, Fig. 3 is additionally referred to. Fig. 3 is a diagram for more specifically explaining the configuration of the shielding plate 26 shown in Fig. 2. Fig. 3 corresponds to the time when smoke is emitted from the two first smoke vent valves 11_1 of the first battery cell 10_1.

[0029] As shown in Fig. 3, the shielding plate 26 is configured to be pressed against the second opposing wall 24a_2 by the pressure (smoke exhaust pressure) of the gas discharged from the first smoke exhaust valve 11_1 when smoke is generated from the first smoke exhaust valve 11_1, thereby blocking the second smoke exhaust hole 24c_2. The shielding plate 26 moves in the cross member 24 by the smoke exhaust pressure in this manner, thereby reducing thermal damage to the second battery cell 10_2 caused by the smoke exhaust from the first battery cell 10_1. In other words, the shielding plate 26 is a blast-resistant plate, and a plate made of, for example, mica and having excellent heat resistance and insulation properties is used as the shielding plate 26. The method of fixing the shielding plate 26 to the cross member 24 to realize such a function of the shielding plate 26 is not particularly limited as long as the shielding plate 26 is configured to move as described above by the smoke exhaust pressure when smoke is generated. For example, the shielding plate 26 may be fixed to the bottom surface of the cross member 24 by a method such as gluing so that it does not move under normal circumstances when no smoke is being generated, but when smoke is generated, it is released from its position by the smoke exhaust pressure and becomes free to move as described above.

[0030] The shielding plate 26 is also configured to function in a similar manner when smoke is emitted from the second smoke vent valve 11_2 (not shown). That is, the shielding plate 26 is configured to be pressed against the first opposing wall 24a_1 by the pressure of the gas discharged from the second smoke vent valve 11_2 when smoke is emitted from the second smoke vent valve 11_2, thereby blocking the first smoke vent hole 24c_1.

[0031] (effect) As described with reference to Figs. 1 to 3, in the battery pack 1 according to this embodiment, the smoke exhaust valve 11 of each battery cell 10 is provided at a position (first and second surfaces 10c_1, 10c_2) facing the cross member 24. That is, the smoke exhaust valve 11 is provided sideways. The cross member 24 having a hollow structure is provided with smoke exhaust holes 24c at a position (first and second opposing walls 24a_1, 24a_2) facing each smoke exhaust valve 11. That is, the internal space 24d of the cross member 24 is used as a smoke exhaust path (first smoke exhaust structure). Since the smoke exhaust valve 11 is not provided on the upper surface 10a of each battery cell 10 in this way, it is not necessary to secure a large space for exhausting smoke above each battery cell 10. This leads to a reduction in the height of the battery pack 1, and also makes it easier to function a structure that cools each battery cell 10 from the upper surface 10a side using a cooler 41 as shown in Fig. 2. Furthermore, it becomes possible to omit the installation of a highly heat-resistant insulating material for protecting the upper case 22 from high-temperature exhaust smoke.

[0032] The battery pack 1 according to the present embodiment includes a shielding plate 26 disposed in the internal space 24d so as to block the gap between the first smoke exhaust hole 24c_1 and the second smoke exhaust hole 24c_2. This can prevent the smoke exhausted from the first smoke exhaust hole 24c_1 (or the second smoke exhaust hole 24c_2) from striking the second smoke exhaust hole 24c_2 (or the first smoke exhaust hole 24c_1) of the adjacent battery cell 10 with force. In this manner, the battery pack 1 can reduce the effect of high-temperature smoke exhausted from one of the first and second battery cells 10_1 and 10_2 on the other (first smoke exhaust structure). This leads to the prevention of chain smoke emission from the battery cell 10 adjacent to the battery cell 10 from which smoke has been generated.

[0033] Also, broadly speaking, the shielding plate 26 may be firmly fixed to the cross member 24 (for example, in a neutral position) so as to resist the exhaust smoke (blast) forcefully flowing into the inside of the cross member 24. On the other hand, as explained with reference to Figures 2 and 3, the shielding plate 26 is configured so that, when smoke is generated, the pressure of gas from the smoke exhaust valve 11 presses the shielding plate 26 against the opposing wall 24a of the cross member 24 on the side of the adjacent battery cell 10, thereby blocking the smoke exhaust hole 24c of the opposing wall 24a. This makes it possible to more sufficiently reduce the impact of the exhaust smoke (blast) on the adjacent battery cell 10 while satisfactorily securing the cross-sectional area of ​​the flow path of the exhaust smoke inside the cross member 24.

[0034] 3. Second smoke exhaust structure Next, a smoke exhaust structure (second smoke exhaust structure) relating to the formation of a path for the smoke exhaust after passing through the cross member 24 will be described with reference to Figures 4 and 5. Here, for ease of explanation, a battery cell group 12 in which each of the multiple battery cells 10 included in the battery pack 1 is regarded as the above-mentioned first battery cell 10_1 will be referred to as the "first battery cell group." Similarly, a battery cell group 12 in which each of the battery cells 10 is regarded as the above-mentioned second battery cell 10_2 will be referred to as the "second battery cell group."

[0035] Fig. 4 is a perspective view of the battery pack 1 for explaining a second smoke exhaust structure according to the embodiment. Fig. 5 is a cross-sectional view taken along line AA in Fig. 4. Note that in Fig. 4, the illustration of the upper case 22 is omitted.

[0036] By providing the cross member 24 configured as described above, the gas (exhaust smoke) discharged from the first or second smoke exhaust valve 11_1, 11_2 passes through the cross member 24 and reaches one or both ends of the cross member 24. If the second smoke exhaust structure using the eaves 50 described below is not provided, the exhaust smoke from the end of the cross member 24 will flow around to the upper part of the battery pack 1, more specifically, above the battery cell group 12. A high-voltage connection part (not shown) such as a bus bar module that connects between the battery cells 10 is disposed above the battery cell group 12. The exhaust smoke is high temperature and contains conductive debris. For this reason, it is desirable to have a structure that prevents the exhaust smoke from the cross member 24 from directly hitting the high-voltage connection part and the upper case 22. In consideration of such additional problems, the battery pack 1 according to this embodiment may be provided with the following second smoke exhaust structure.

[0037] The internal space of the battery case 20 includes a side space S1 and an upper space S2 near the ends of the cross member 24 in the second direction D2. As shown in Fig. 5, the side space S1 is located between the first battery cell group 12_1, the second battery cell group 12_2, and the cross member 24 and the battery case 20 at the ends of the second direction D2. The upper space S2 is located above the respective ends E of the first battery cell group 12_1, the second battery cell group 12_2, and the cross member 24 at the ends of the second direction D2.

[0038] To realize the second smoke exhaust structure, the battery pack 1 is provided with a canopy 50. As shown in Fig. 5, the canopy 50 is formed so as to separate the side space S1 from the upper space S2, and corresponds to an example of a "partition member" according to the present disclosure.

[0039] More specifically, as shown in FIG. 5, the eaves 50 are formed to bridge between upper portions U of the ends E of the first battery cell group 12_1, the second battery cell group 12_2, and the cross member 24 and a portion C of the lower case 21 that forms the side space S1. In the example shown in FIG. 5, the portion C is a portion of the side reinforcement 23 included in the lower case 21 that extends in a horizontal direction parallel to the second direction D2. With respect to the first direction D1, the eaves 50 are formed to extend along the first direction D1 as shown in FIG. 4. More specifically, the eaves 50 are present between the lower case 21 and upper portions U of all of the first battery cell group 12_1, the second battery cell group 12_2, and the cross member 24 that are located at the ends of the second direction D2.

[0040] The eaves 50 is fixed to the upper part U at a predetermined position in the first direction D1, for example. The tip of the eaves 50 has a small gap between it and the lower case 21 (side reinforcement 23), for example. Alternatively, the tip of the eaves 50 may be joined to the lower case 21. Also, instead of the example shown in Figs. 4 and 5, the eaves 50 may be formed to bridge between the upper part U and the upper case 22.

[0041] Also, the canopy 50 is similarly provided, for example, on the other end side of the cross member 24, which is not shown in Fig. 5. Alternatively, the other end of the cross member 24 may be closed. In other words, the smoke may be discharged to the outside of the cross member 24 from only one end of the cross member 24.

[0042] According to the second smoke exhaust structure using the eaves 50 described above, the smoke that flows into the internal space 24d of the cross member 24 from a certain smoke exhaust hole 24c is guided to the end of the cross member 24 as shown by the arrow in FIG. 5. Then, the smoke that flows from the end of the cross member 24 into the duct portion 52 using the eaves 50 moves toward each end of the duct portion 52 in the first direction D1 (vehicle front-rear direction) as shown in FIG. 4. Then, the smoke that leaves the duct portion 52 is discharged to the outside of the battery pack 1 from a smoke exhaust valve (not shown) provided in the battery case 20 (for example, the upper case 22). The smoke exhaust valve is provided, for example, at one end of the first direction D1. Alternatively, the smoke exhaust valve may be provided at both ends of the first direction D1. Note that one end of the duct portion 52 in the first direction D1 may be closed. In other words, the smoke may be exhausted to the outside of the duct portion 52 from only one end of the duct portion 52, and exhausted to the outside of the battery pack 1 from a smoke exhaust valve arranged on the side of that one end.

[0043] (effect) 4 and 5, the battery pack 1 is provided with a canopy 50 that is an example of a partition member formed to separate the side space S1 from the upper space S2 (second smoke exhaust structure). This makes it possible to prevent the smoke exhausted from the end of the cross member 24 in the second direction D2 from flowing from the side space S1 to above the battery cell group 12. This makes it possible to prevent the smoke exhausted from the cross member 24 from directly hitting the high-voltage connection parts and the upper case 22. [Explanation of symbols]

[0044] REFERENCE SIGNS LIST 1 battery pack, 10 battery cell, 11 smoke exhaust valve, 12 battery cell group, 20 20 battery case, 21 lower case, 22 upper case, 23 side reinforcement, 24 cross member, 24a opposing wall, 24c smoke exhaust hole, 26 shielding plate, 30 adhesive, 31 restraining member, 50 eaves, 52 duct section

Claims

1. a plurality of battery cells including first and second battery cells adjacent to each other along a first direction; a battery case that houses the plurality of battery cells and includes a cross member that is disposed between the first battery cell and the second battery cell and is formed to extend in a second direction perpendicular to the first direction; Equipped with the cross member has a hollow structure having an internal space, and includes a first opposing wall opposing a first surface of the first battery cell and a second opposing wall opposing a second surface of the second battery cell; the first battery cell includes a first smoke exhaust valve provided on the first surface; the second battery cell includes a second smoke exhaust valve provided on the second surface; The first opposing wall includes a first smoke exhaust hole provided at a position opposite to the first smoke exhaust valve and penetrating into the internal space, The second opposing wall includes a second smoke exhaust hole provided at a position opposite to the second smoke exhaust valve and penetrating into the internal space, The smoke detector further includes a shielding plate disposed in the internal space so as to block the gap between the first smoke exhaust hole and the second smoke exhaust hole. A battery pack characterized by:

2. The shielding plate is configured to be pressed against the second opposing wall by the pressure of gas discharged from the first smoke vent valve when smoke is emitted from the first smoke vent valve, thereby blocking the second smoke vent hole, and to be pressed against the first opposing wall by the pressure of gas discharged from the second smoke vent valve when smoke is emitted from the second smoke vent valve, thereby blocking the first smoke vent hole.

2. The battery pack according to claim 1 .

3. the first and second battery cells are configured as first and second battery cell groups each having a plurality of battery cells arranged in the second direction, The internal space of the battery case is a side space located at an end in the second direction between the first battery cell group, the second battery cell group, and the cross member and the battery case; an upper space located above each end of the first battery cell group, the second battery cell group, and the cross member at the end in the second direction; Including, The storage container further includes a partition member formed to separate the side space from the upper space.

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

4. The partition member is a canopy formed to bridge between upper portions of the ends of the first battery cell group, the second battery cell group, and the cross member and a portion of the battery case that forms the side space.

4. The battery pack according to claim 3.

Images