Battery pack

Abstract

The breakage resistance of the protective material provided between the gas exhaust portion of the battery module and the housing is improved. [Solution] The battery pack 10 comprises a battery module 100 having a gas exhaust hole 122, a pack housing 200 that houses the battery module 100, an upper protective material 312 and a lower protective material 314 that are located between the gas exhaust hole 122 and the pack housing 200, and a reinforcing material 320 that is located between the gas exhaust hole 122 and the pack housing 200 and reinforces the upper protective material 312 and the lower protective material 314.

Description

[Technical Field]

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

[0002] In recent years, various battery packs have been developed. A battery pack includes a battery module and a housing that houses the battery module.

[0003] Patent Document 1 describes an electricity storage module. The electricity storage module includes a secondary battery cell having a smoke vent, and an insulator arranged above the smoke vent.

[0004] Patent Document 2 describes a battery pack. The battery pack includes multiple battery cells and a heat-resistant member facing the exhaust valves of the multiple battery cells. The heat-resistant member has an inner layer facing the exhaust valves of the multiple battery cells, a bellows-shaped outer layer laminated on the inner layer, and a bonding material filled in the gap between the inner layer and the outer layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-047105 [Patent Document 2] Patent Publication No. 2021-174673 Summary of the Invention [Problem to be solved by the invention]

[0006] In a battery pack, a relatively high-temperature gas may be discharged from the gas exhaust section of the battery module. A protective material may be provided between the gas exhaust section and the housing to protect the housing from the gas. To reliably protect the housing from the gas, it is necessary to improve the breakage resistance of the protective material.

[0007] One example of an object of the present invention is to improve the breakage resistance of a protective material provided between a gas exhaust portion of a battery module and a housing. Other objects of the present invention will become apparent from the description of this specification. [Means for solving the problem]

[0008] One aspect of the present invention is as follows. 1. A battery module having a gas exhaust section; a housing that houses the battery module; a protective material positioned between the gas exhaust portion and the housing; a reinforcing member positioned between the gas exhaust portion and the housing and reinforcing the protective member; A battery pack comprising: 2. The battery pack according to claim 1, wherein the protective material is located both between the gas exhaust portion and the reinforcing material and between the housing and the reinforcing material. 3. The battery pack according to 2., wherein the reinforcing material has a metal layer. 4. The battery pack according to claim 1, wherein the protective material is located at least one of between the gas exhaust portion and the reinforcing material and between the housing and the reinforcing material. [Effects of the Invention]

[0009] According to the above aspect of the present invention, it is possible to improve the breakage resistance of the protective material provided between the gas exhaust portion of the battery module and the housing. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a battery pack according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] 10 is a cross-sectional view showing an upper protective material, a lower protective material, and a reinforcing material according to Modification 1. FIG. [Figure 4] FIG. 10 is a cross-sectional view showing a protective material and a reinforcing material according to Modification 2. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments and modifications of the present invention will be described with reference to the drawings. In all the drawings, similar components are designated by similar reference numerals, and descriptions thereof will be omitted as appropriate.

[0012] Fig. 1 is a perspective view of a battery pack 10 according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1.

[0013] In the embodiment, the battery pack 10 is mounted on an automobile. Specifically, the battery pack 10 is mounted between the front and rear wheels of the automobile. Unless otherwise specified, the following description will be given assuming that the battery pack 10 is mounted on an automobile. However, the battery pack 10 can also be used for purposes other than automobiles.

[0014] For the purpose of explanation, the X, Y, and Z directions are shown in each figure. The X direction indicates the front-to-rear direction of the battery pack 10. The Y direction is perpendicular to the X direction. The Y direction indicates the left-to-right direction of the battery pack 10. The X, Y, and Z directions are non-parallel to each other. The Z direction is perpendicular to both the X and Y directions. The Z direction indicates the up-down direction of the battery pack 10. The arrow pointing to the X direction, the arrow pointing to the Y direction, and the arrow pointing to the Z direction indicate the front, left, and up directions of the battery pack 10, respectively. In FIG. 2, the white circle with a black dot indicating the X direction indicates that the arrow pointing to the X direction extends from the back of the page to the front. However, the relationship between the X, Y, and Z directions and the front-to-rear, left-to-right, and up-to-down directions of the battery pack 10 is not limited to this example.

[0015] In the embodiment, the front-rear direction, left-right direction, and up-down direction of the battery pack 10 are determined by the vehicle in which the battery pack 10 is mounted. The X direction, Y direction, and Z direction respectively indicate the front-rear direction, left-right direction, and up-down direction of the vehicle. The arrow pointing to the X direction, the arrow pointing to the Y direction, and the arrow pointing to the Z direction respectively indicate the front, left, and up directions of the vehicle. However, the relationship between the front-rear direction, left-right direction, and up-down direction of the battery pack 10 and the front-rear direction, left-right, and up-down directions of the vehicle is not limited to this example.

[0016] Hereinafter, as needed, the side indicated by the arrow indicating the X direction will be referred to as the +X side, and the side opposite the side indicated by the arrow indicating the X direction will be referred to as the -X side. Hereinafter, as needed, the side indicated by the arrow indicating the Y direction will be referred to as the +Y side, and the side opposite the side indicated by the arrow indicating the Y direction will be referred to as the -Y side. Hereinafter, as needed, the side indicated by the arrow indicating the Z direction will be referred to as the +Z side, and the side opposite the side indicated by the arrow indicating the Z direction will be referred to as the -Z side.

[0017] A battery pack 10 according to an embodiment will be described with reference to FIGS.

[0018] 1 and 2, the battery pack 10 includes a plurality of battery modules 100, a pack housing 200, an upper protective material 312, a lower protective material 314, and a reinforcing material 320. For the sake of explanation, in Fig. 1, the plurality of battery modules 100 housed inside the pack housing 200 are shown by dashed lines.

[0019] In the example shown in FIG. 1, four battery modules 100 are arranged in two rows and two columns in the X and Y directions. When viewed in the Z direction, each battery module 100 has a substantially rectangular shape with a pair of sides substantially parallel to the X direction and another pair of sides substantially parallel to the Y direction. The number, shape, and arrangement of the battery modules 100 are not limited to those shown in FIG. 1. For example, the battery pack 10 may include only one battery module 100. Alternatively, the battery pack 10 may include, for example, five or more battery modules 100.

[0020] As shown in FIG. 2, each battery module 100 includes a plurality of battery cells 110 and a module housing 120.

[0021] In the example shown in Fig. 2, multiple battery cells 110 are stacked in the Y direction. When viewed from the Y direction, each battery cell 110 has, for example, a substantially rectangular shape with a pair of long sides substantially parallel to the X direction and a pair of short sides substantially parallel to the Z direction. The multiple battery cells 110 are electrically connected to each other in series, in parallel, or in a combination of series and parallel. The number, shape, and arrangement of the battery cells 110 are not limited to the example shown in Fig. 2.

[0022] The module housing 120 houses a plurality of battery cells 110. The module housing 120 is at least partially made of metal. By making the module housing 120 at least partially made of metal, the strength of the module housing 120 can be improved. When the module housing 120 is at least partially made of metal, the module housing 120 has electrical conductivity.

[0023] As shown in FIG. 2 , a portion of the module housing 120 covering the upper +Z side of the multiple battery cells 110 defines multiple gas exhaust holes 122. If an abnormality occurs in a battery cell 110, the battery cell 110 may generate relatively high-temperature gas. The gas generated from the battery cell 110 is discharged upward on the +Z side of the module housing 120 through the multiple gas exhaust holes 122. Therefore, the gas exhaust holes 122 serve as gas exhaust sections for discharging the gas generated from the battery cell 110 to the outside of the module housing 120. In the example shown in FIG. 2 , the multiple gas exhaust holes 122 overlap with the multiple battery cells 110. However, the number and arrangement of the gas exhaust holes 122 are not limited to the example shown in FIG. 2 . For example, the positions of the gas exhaust holes 122 may be determined independently of the positions of the battery cells 110.

[0024] As shown in FIG. 1 , the pack housing 200 has a lower plate 210, a side frame 220, and an upper plate 230. The lower plate 210 and the side frame 220 are sometimes collectively referred to as a lower case. The upper plate 230 is sometimes referred to as an upper case. The pack housing 200 houses a plurality of battery modules 100. The lower plate 210, the side frame 220, and the upper plate 230 are at least partially made of metal. By making the lower plate 210, the side frame 220, and the upper plate 230 at least partially made of metal, the strength of the pack housing 200 can be improved. By making the lower plate 210, the side frame 220, and the upper plate 230 at least partially made of metal, the lower plate 210, the side frame 220, and the upper plate 230 are electrically conductive.

[0025] The lower plate 210 is disposed substantially perpendicular to the Z direction. The multiple battery modules 100 are located on the +Z side of the +Z side surface of the lower plate 210. As shown in Fig. 1, the lower plate 210 has a longitudinal direction substantially parallel to the X direction and a lateral direction substantially parallel to the Y direction. The shape of the lower plate 210 is not limited to the example shown in Fig. 1.

[0026] The side frame 220 extends toward the +Z side from the entire periphery of the +Z side surface of the lower plate 210. When viewed from the Z direction, the side frame 220 surrounds the area where the multiple battery modules 100 are located.

[0027] The upper plate 230 is located on the +Z side with respect to the multiple battery modules 100 and the side frame 220. When viewed from the Z direction, the lower plate 210 and the upper plate 230 have substantially the same shape. The side frame 220 and the portion of the upper plate 230 that overlaps with the side frame 220 in the Z direction are fastened to each other with fasteners such as bolts (not shown). With the side frame 220 and the portion of the upper plate 230 that overlaps with the side frame 220 in the Z direction fastened to each other, the lower plate 210, the side frame 220, and the upper plate 230 form an accommodation space that accommodates multiple battery modules 100.

[0028] The upper protective material 312, the lower protective material 314, and the reinforcing material 320 will be described with reference to Fig. 2. In the example shown in Fig. 2, the upper protective material 312, the lower protective material 314, and the reinforcing material 320 are substantially sheet-shaped. Therefore, the upper protective material 312, the lower protective material 314, and the reinforcing material 320 according to the embodiment can also be referred to as an upper protective layer, a lower protective layer, and a reinforcing layer, respectively.

[0029] In the example shown in FIG. 2 , the upper protective material 312, the lower protective material 314, and the reinforcing material 320 are positioned between the multiple gas discharge holes 122 and the upper plate 230 in the Z direction. Specifically, the upper protective material 312 and the reinforcing material 320 are stacked together in the Z direction, with the upper protective material 312 positioned on the lower surface of the upper plate 230 on the -Z side, and the reinforcing material 320 positioned on the lower surface of the upper protective material 312 on the -Z side. In the example shown in FIG. 2 , the stack of the upper protective material 312 and the reinforcing material 320 overlaps with the multiple battery cells 110 and the multiple gas discharge holes 122 in the Z direction. The upper surface of the +Z side of the upper protective material 312 and the lower surface of the -Z side of the upper plate 230 are joined to each other by a joining means such as an adhesive. The lower surface of the -Z side of the upper protective material 312 and the upper surface of the +Z side of the reinforcing material 320 are joined to each other by a joining means such as an adhesive. The lower protective material 314 covers the laminate of the upper protective material 312 and the reinforcing material 320 and the underside of the upper plate 230 on the -Z side. Therefore, the lower protective material 314 covers the underside of the -Z side of the reinforcing material 320 and the side surfaces of the reinforcing material 320 around the Z direction. The upper surface on the +Z side of the portion of the lower protective material 314 that overlaps with the reinforcing material 320 in the Z direction and the underside of the -Z side of the reinforcing material 320 are joined to each other by a joining means such as an adhesive. The portion of the underside of the -Z side of the upper plate 230 that is located around the laminate of the upper protective material 312 and the reinforcing material 320 and the upper surface on the +Z side of the portion of the lower protective material 314 that is located around the laminate of the upper protective material 312 and the reinforcing material 320 are joined to each other by a joining means such as an adhesive.

[0030] The upper protective material 312 and the lower protective material 314 are provided to protect the upper plate 230 from the gas discharged from the gas discharge hole 122. The upper protective material 312 and the lower protective material 314 have heat resistance so that they can protect the upper plate 230 from the gas discharged from the gas discharge hole 122. Furthermore, the upper protective material 312 and the lower protective material 314 are provided to prevent a short circuit between the module housing 120 and the upper plate 230. The upper protective material 312 and the lower protective material 314 have electrical insulation so that they can prevent a short circuit between the module housing 120 and the upper plate 230.

[0031] The functions of the upper protective material 312 and the lower protective material 314 are not limited to heat resistance and electrical insulation. The upper protective material 312 and the lower protective material 314 may have rust resistance to suppress rust on the upper plate 230. Alternatively, the upper protective material 312 and the lower protective material 314 may have breakage resistance to prevent breakage on the upper plate 230. In one example, the upper protective material 312 and the lower protective material 314 have at least one of heat resistance, electrical insulation, rust resistance, and breakage resistance.

[0032] The materials used for the upper protective member 312 and the lower protective member 314 are not particularly limited as long as they are capable of achieving the above-described functions of the upper protective member 312 and the lower protective member 314. Examples include glass, pottery, ceramics such as cement, resins such as thermoplastic resins and thermosetting resins, wood, brick, stone, silicone, rubber, etc. These exemplified materials may be used alone or in combination. When these exemplified materials are used in combination, the combined material may be a mixture of the combined materials or a composite of the combined materials. The upper protective member 312 and the lower protective member 314 may be made of the same material or different materials.

[0033] The reinforcing member 320 mechanically reinforces the upper protective member 312 and the lower protective member 314. Therefore, the breakage resistance of the upper protective member 312 and the lower protective member 314 can be improved compared to when the reinforcing member 320 is not provided. In the embodiment, even when the pressure of the gas ejected from the gas discharge holes 122 toward the upper protective member 312 and the lower protective member 314 is relatively high, breakage of the upper protective member 312 and the lower protective member 314 can be suppressed. When the mechanical strength of the reinforcing member 320 is higher than both the mechanical strength of the upper protective member 312 and the mechanical strength of the lower protective member 314, the reinforcing member 320 can reinforce the upper protective member 312 and the lower protective member 314.

[0034] The material used for the reinforcing member 320 is not particularly limited as long as it can reinforce the upper protective member 312 and the lower protective member 314, and examples thereof include metals such as iron, steel, and aluminum; ceramics such as glass, pottery, and cement; resins such as thermoplastic resins and thermosetting resins; bricks; and stone. These exemplified materials may be used alone or in combination. When these exemplified materials are used in combination, the combined material may be a mixture of the combined materials or a composite of the combined materials.

[0035] From the viewpoints of availability, strength, cost, etc., the reinforcing material 320 may be a metal layer of iron, steel, aluminum, etc. When the reinforcing material 320 is a metal layer and is conductive, it is preferable that both the upper protective material 312 and the lower protective material 314 are provided, as described below. However, even when the reinforcing material 320 is a metal layer and is conductive, one of the upper protective material 312 and the lower protective material 314 does not have to be provided.

[0036] If the upper protective material 312 were not provided, the lower surface on the -Z side of the upper plate 230 and the upper surface on the +Z side of the reinforcing material 320 would come into contact with each other, resulting in electrical conduction between the upper plate 230 and the reinforcing material 320. If a portion of the lower protective material 314 overlapping with the reinforcing material 320 in the Z direction were damaged while the upper plate 230 and the reinforcing material 320 were electrically connected to each other, it may be difficult to prevent a short circuit between the module housing 120 and the upper plate 230 via the reinforcing material 320. However, in the embodiment, even if a portion of the lower protective material 314 overlapping with the reinforcing material 320 in the Z direction is damaged, the upper protective material 312 can prevent a short circuit between the module housing 120 and the upper plate 230 via the reinforcing material 320. Therefore, if the reinforcing material 320 is a metal layer and is electrically conductive, it is preferable that the upper protective material 312 be located between the upper plate 230 and the reinforcing material 320.

[0037] In the embodiment, the area of ​​the upper protective material 312 perpendicular to the Z direction and the area of ​​the reinforcing material 320 perpendicular to the Z direction are substantially equal. Therefore, contact and electrical conduction between the upper plate 230 and the reinforcing material 320 can be more easily suppressed compared to when the area of ​​the reinforcing material 320 perpendicular to the Z direction is larger than the area of ​​the upper protective material 312 perpendicular to the Z direction. In order to suppress contact and electrical conduction between the upper plate 230 and the reinforcing material 320, the area of ​​the reinforcing material 320 perpendicular to the Z direction may be smaller than the area of ​​the upper protective material 312 perpendicular to the Z direction. Alternatively, the area of ​​the reinforcing material 320 perpendicular to the Z direction may be larger than the area of ​​the upper protective material 312 perpendicular to the Z direction.

[0038] If the lower protective member 314 were not provided, a short circuit between the module housing 120 and the reinforcing member 320 could cause the reinforcing member 320 to reach a relatively high temperature. If the reinforcing member 320 reaches a relatively high temperature, it could be difficult to prevent heat damage to the upper plate 230 and the reinforcing member 320 of the upper protective member 312. However, in the embodiment, the lower protective member 314 can prevent a short circuit between the module housing 120 and the reinforcing member 320, thereby preventing the reinforcing member 320 from reaching a relatively high temperature. Furthermore, the heat of the battery module 100 itself could melt a joining means, such as an adhesive, between the lower surface of the -Z side of the upper plate 230 and the upper surface of the +Z side of the upper protective member 312, or between the lower surface of the -Z side of the upper protective member 312 and the upper surface of the +Z side of the reinforcing member 320, causing the reinforcing member 320 to sag toward the battery module 100. If the reinforcing member 320 hangs down toward the battery module 100, it may be difficult to prevent a short circuit between the module housing 120 and the reinforcing member 320 due to contact between the module housing 120 and the reinforcing member 320. However, in the embodiment, even if the reinforcing member 320 hangs down toward the battery module 100, contact between the module housing 120 and the reinforcing member 320 can be prevented by the lower protective member 314. Therefore, if the reinforcing member 320 is a metal layer and is conductive, it is preferable that the lower protective member 314 be located between the battery module 100 and the reinforcing member 320.

[0039] In the embodiment, the lower protection material 314 covers not only the lower surface on the -Z side of the reinforcing material 320 but also the side surfaces of the reinforcing material 320 around the Z direction. Therefore, contact and short-circuiting between the module housing 120 and the reinforcing material 320 can be more easily suppressed compared to when the side surfaces of the reinforcing material 320 around the Z direction are exposed from the lower protection material 314. However, the side surfaces of the reinforcing material 320 around the Z direction may be exposed from the lower protection material 314. For example, when the lower protection material 314 is located on the lower surface side of the -Z side of the reinforcing material 320, the area of ​​the lower protection material 314 perpendicular to the Z direction may be equal to or smaller than the area of ​​the reinforcing material 320 perpendicular to the Z direction.

[0040] 2, one upper protective material 312, one lower protective material 314, and one reinforcing material 320 are provided for one battery module 100. The numbers of upper protective materials 312, lower protective materials 314, and reinforcing materials 320 provided for one battery module 100 are not limited to the example shown in FIG. 2. For example, one upper protective material 312, one lower protective material 314, and one reinforcing material 320 may be provided for multiple battery modules 100. Alternatively, multiple protective materials corresponding to the upper protective material 312 or the lower protective material 314 and multiple reinforcing materials corresponding to the reinforcing material 320 may be alternately stacked in the Z direction between the battery module 100 and the upper plate 230.

[0041] 2, the reinforcing material 320 extends continuously across multiple regions that overlap with the multiple battery cells 110 and the multiple gas discharge holes 122 in the Z direction. This makes it easier to maintain the strength of the reinforcing material 320 compared to when the multiple reinforcing materials 320 are arranged spaced apart from each other in multiple regions that overlap with the multiple battery cells 110 and the multiple gas discharge holes 122 in the Z direction. However, the multiple reinforcing materials 320 may also be arranged spaced apart from each other in multiple regions that overlap with the multiple battery cells 110 and the multiple gas discharge holes 122 in the Z direction.

[0042] The reinforcing material 320 does not have to be a metal layer and may be an insulating layer as long as it can reinforce the upper protective material 312 and the lower protective material 314. Neither the upper protective material 312 nor the lower protective material 314 needs to be provided as long as it can protect the upper plate 230 from the gas discharged from the gas discharge hole 122. For example, only one of the upper protective material 312 and the lower protective material 314 may be provided.

[0043] 3 is a cross-sectional view showing an upper protective material 312A, a lower protective material 314A, and a reinforcing material 320A according to Modification 1. The upper protective material 312A, the lower protective material 314A, and the reinforcing material 320A according to Modification 1 are similar to the upper protective material 312, the lower protective material 314, and the reinforcing material 320 according to the embodiment, except for the following points.

[0044] 3, the area perpendicular to the Z direction of the upper protective material 312A may be larger than both the area perpendicular to the Z direction of the lower protective material 314A and the area perpendicular to the Z direction of the reinforcing material 320A. In the example shown in FIG. 3, even if the reinforcing material 320A is a metal layer and is conductive, contact and short-circuiting between the reinforcing material 320A and a portion of the upper plate 230 that overlaps with the reinforcing material 320A in the Z direction can be suppressed by the portion of the upper protective material 312A that overlaps with the reinforcing material 320A in the Z direction. Furthermore, contact and short-circuiting between the reinforcing material 320A and a portion of the upper plate 230 that is located around the portion that overlaps with the reinforcing material 320A in the Z direction can be suppressed by the portion of the upper protective material 312A that is located around the portion that overlaps with the reinforcing material 320A in the Z direction.

[0045] 3, the area perpendicular to the Z direction of the lower protection material 314A and the area perpendicular to the Z direction of the reinforcing material 320A are substantially equal. Therefore, even if the reinforcing material 320A is a metal layer and is conductive, contact and short-circuiting between the module housing 120 and the reinforcing material 320A can be more easily prevented than when the area perpendicular to the Z direction of the lower protection material 314A is smaller than the area perpendicular to the Z direction of the reinforcing material 320A.

[0046] In the first modification, the reinforcing member 320A also reinforces the upper protective member 312A and the lower protective member 314A. Therefore, similarly to the embodiment, the breakage resistance of the upper protective member 312A and the lower protective member 314A can be improved compared to when the reinforcing member 320A is not provided. The reinforcing member 320A does not have to be a metal layer and may be an insulating layer, as long as it can reinforce the upper protective member 312A and the lower protective member 314A. Neither the upper protective member 312A nor the lower protective member 314A needs to be provided, as long as it can protect the upper plate 230 from the gas discharged from the gas discharge hole 122. For example, only one of the upper protective member 312A and the lower protective member 314A may be provided.

[0047] 4 is a cross-sectional view showing a protective material 310B and a reinforcing material 320B according to Modification 2. The protective material 310B and the reinforcing material 320B according to Modification 2 are similar to the upper protective material 312, the lower protective material 314, and the reinforcing material 320 according to the embodiment, except for the following points.

[0048] The protective material 310B is wrapped around the reinforcing material 320B in the X direction. Therefore, the reinforcing material 320B is covered by the protective material 310B in the X direction. Therefore, a portion of the protective material 310B is located between the lower surface on the -Z side of the upper plate 230 and the upper surface on the +Z side of the reinforcing material 320B, and another portion of the protective material 310B is located between the plurality of gas discharge holes 122 and the -Z side surface of the reinforcing material 320B. Therefore, even if the reinforcing material 320B is a metal layer and is conductive, contact and short-circuiting between the upper plate 230 and the reinforcing material 320B can be suppressed in the same manner as in the embodiment, and contact and short-circuiting between the module housing 120 and the reinforcing material 320B can be suppressed.

[0049] In Modification 2, the reinforcing material 320B also reinforces the protective material 310B. Therefore, similar to the embodiment, the breakage resistance of the protective material 310B can be improved compared to when the reinforcing material 320B is not provided. The reinforcing material 320B does not have to be a metal layer and may be an insulating layer as long as it can reinforce the protective material 310B.

[0050] The method for covering the reinforcing material 320B with the protective material 310B is not limited to the example shown in Fig. 4. For example, the reinforcing material 320B may be covered with the protective material 310B by painting or dipping the material constituting the protective material 310B.

[0051] Although the embodiments and modifications of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0052] For example, in the embodiment and modified examples, the protective material and reinforcing material are described as being provided between the battery module 100 and the upper plate 230. The protective material and reinforcing material can be installed not only between the battery module 100 and the upper plate 230, but also between the battery module 100 and a portion of the pack housing 200 that is different from the upper plate 230. [Explanation of symbols]

[0053] 10 battery pack, 100 battery module, 110 battery cell, 120 module housing, 122 gas exhaust hole, 200 pack housing, 210 lower plate, 220 side frame, 230 upper plate, 310B protective material, 312, 312A upper protective material, 314, 314A lower protective material, 320, 320A, 320B reinforcement material

Claims

1. a battery module having a gas exhaust section; a housing that houses the battery module; a protective material positioned between the gas exhaust portion and the housing; a reinforcing member positioned between the gas exhaust portion and the housing and reinforcing the protective member; A battery pack comprising:

2. The battery pack according to claim 1 , wherein the protective material is located both between the gas discharge portion and the reinforcing material and between the housing and the reinforcing material.

3. The battery pack of claim 2 , wherein the reinforcing material comprises a metal layer.

4. The battery pack according to claim 1 , wherein the protective material is located at least one of between the gas discharge portion and the reinforcing material and between the housing and the reinforcing material.

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