Battery pack and electric automobile

Abstract

The utility model discloses a battery pack and an electric vehicle. The battery pack comprises a plurality of battery modules and a heat-resistant member, the plurality of battery modules are arranged along a first direction, each battery module comprises a plurality of layers of battery packs stacked along a height direction, and each layer of battery pack is composed of a plurality of battery monomers arranged along a second direction; a heat-resistant component is arranged between every two adjacent battery modules, each heat-resistant component comprises a plurality of heat-resistant parts arranged in the height direction, the heat-resistant parts and the battery packs are oppositely arranged, and the heat-resistant degree of the heat-resistant part, close to the base plate, in all the heat-resistant parts is smaller than that of the other heat-resistant parts. The heat-resisting part with the low heat-resisting degree is melted preferentially, so that the high-temperature and high-pressure gas flows to the heat-resisting part with the low heat-resisting degree preferentially, the high-temperature and high-pressure gas is prevented from flowing to the position above the battery pack, the influence of the high-temperature and high-pressure gas on passengers is reduced, and the safety of the electric automobile is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electric vehicle. Background Art

[0002] Electric vehicles usually use lithium battery packs as a power source. Due to the limitations of the body structure of electric vehicles, battery packs are mostly installed on the chassis of electric vehicles. Since seats are usually installed above the chassis, if the battery pack catches fire or explodes, it will directly affect the safety of passengers. Therefore, the safety of the battery pack is crucial to the development of electric vehicles.

[0003] In the related art, the largest surface of the battery cells in the battery pack is directed toward the chassis to reduce the impact force on the largest surface of the battery cells in the battery pack during a car collision, thereby improving the safety of the battery pack. Since a liquid cooling plate is usually provided in the battery pack near the chassis, cooling water is passed into the liquid cooling plate, which has a better cooling effect on the battery cells in the lower layer of the battery pack. The cooling effect of the battery cells in the upper layer of the battery pack is relatively general, making the battery cells in the upper layer of the battery pack more susceptible to thermal runaway. When the battery cells in the upper layer of the battery pack experience thermal runaway, the high-temperature and high-pressure gas ejected from the battery cells is likely to be ejected from above the battery pack, directly affecting the safety of passengers. Utility Model Content

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a battery pack and an electric vehicle.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect, a battery pack is provided, comprising:

[0007] A battery module, wherein a plurality of the battery modules are arranged in a first direction, the battery module comprises a plurality of battery packs stacked in a height direction, each layer of the battery packs is composed of a plurality of battery cells arranged in a second direction, the first direction and the second direction are perpendicular, and the height direction is consistent with the thickness direction of the battery cells;

[0008] The battery cell includes an explosion-proof valve;

[0009] A heat-resistant component is provided between two adjacent battery modules, the heat-resistant component includes a plurality of heat-resistant parts arranged along a height direction, the heat-resistant parts are arranged opposite to the explosion-proof valve of the battery pack, and the heat resistance of the heat-resistant parts close to the bottom of the battery pack among all the heat-resistant parts is lower than that of the other heat-resistant parts.

[0010] As an alternative to the battery pack, in one of the heat-resistant members, the heat-resistant portion near the bottom of the battery pack has a concave curved surface on the side facing one side of the explosion-proof valve of the battery pack, and the rest of the heat-resistant portion has a convex curved surface on the side facing one side of the explosion-proof valve of the battery pack.

[0011] As an alternative to the battery pack, the explosion-proof valves of two adjacent battery modules both face the heat-resistant member. Both side surfaces of the heat-resistant member include a plurality of heat-resistant portions arranged in the height direction, and the heat-resistant portions on both side surfaces are symmetrically arranged.

[0012] As an alternative to the battery pack, in one of the heat-resistant members, the thickness of the heat-resistant portion near the bottom of the battery pack is less than the thickness of the rest of the heat-resistant portions.

[0013] As an alternative to the battery pack, one side surface of each heat-resistant portion facing the explosion-proof valve of the battery pack has a U-shaped concave portion, and the opening of the U-shaped concave portion faces the explosion-proof valve of the battery pack.

[0014] As an alternative to the battery pack, the heat-resistant member includes an integral structure or a split structure;

[0015] Or, the heat-resistant member includes a split structure composed of a plurality of split parts, the heat-resistant portion includes the split parts, and the heat-resistant degrees of the split parts are different.

[0016] As an alternative to the battery pack, the battery pack includes a box body, the box body includes a first shell and a second shell that are hermetically fitted, the largest surface of the first shell and the second shell is the largest surface of the box body, and the plane where the explosion-proof valve is located is perpendicular to the largest surface of the box body.

[0017] As an alternative to the battery pack, a plurality of first support beams are arranged at intervals in a first direction on the largest surface of the first shell, second support beams corresponding to the first support beams are arranged on the largest surface of the second shell, and both ends of the heat-resistant member are respectively fixed on the first support beam and the second support beam.

[0018] As an alternative to the battery pack, mounting grooves are provided on both end faces of the heat-resistant member in the height direction, and the heat-resistant member is fixedly connected to the box body at the mounting grooves.

[0019] In a second aspect, an electric vehicle is provided, including a chassis and the battery pack according to any one of the above, the battery pack is mounted on the chassis, and the plane where the explosion-proof valve is located is perpendicular to the plane where the chassis is located.

[0020] The beneficial effects of the present application are as follows:

[0021] The battery pack provided in the present application includes a battery module and a heat-resistant component, wherein a plurality of battery modules are arranged along a first direction, and the battery module includes a plurality of layers of battery groups stacked along a height direction, and each layer of battery groups is composed of a plurality of battery cells arranged along a second direction; a heat-resistant component is provided between two adjacent battery modules, and the heat-resistant component includes a plurality of heat-resistant parts arranged along a height direction, and the heat-resistant parts are arranged opposite to the battery groups, and the heat-resistant degree of the heat-resistant parts close to the chassis among all the heat-resistant parts is lower than the heat-resistant degree of the other heat-resistant parts, so that when thermal runaway occurs in the battery pack, the heat-resistant parts with lower heat resistance will melt first, so that the high-temperature and high-pressure gas will flow to the heat-resistant parts with lower heat resistance first, thereby preventing the high-temperature and high-pressure gas from flowing to the top of the battery pack, reducing the impact of the high-temperature and high-pressure gas on passengers, and improving the safety of the electric vehicle.

[0022] The electric vehicle provided in this application has better safety by applying the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present application and these drawings without paying any creative work.

[0024] Figure 1 is a structural schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0025] Figure 2 is an exploded schematic diagram of a battery pack provided in an embodiment of the present application;

[0026] Figure 3 is an exploded schematic diagram of a battery cell provided in an embodiment of the present application;

[0027] Figure 4 is an exploded schematic diagram of a partial internal structure of a battery pack provided in an embodiment of the present application in one situation;

[0028] Figure 5 It is a structural schematic diagram of a heat-resistant component provided in an embodiment of the present application;

[0029] Figure 6 It is a schematic structural diagram of another heat-resistant component provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 100, chassis; 200, battery pack;

[0032] 1. box body; 11. first shell; 111. first support beam; 1111. raised column; 12. second shell;

[0033] 2. Battery module; 21. Battery pack; 211. Battery cell; 2111. Housing; 2112. End plate; 2113. Explosion-proof valve;

[0034] 3. Heat-resistant component; 31. Heat-resistant portion; 32. Mounting groove. DETAILED DESCRIPTION

[0035] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0036] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0037] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0038] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0039] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0040] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0042] Figure 1 An electric vehicle provided in this embodiment is shown, including a chassis 100, an electric drive system, an electric control system and a battery pack 200. The battery pack 200 is installed on the chassis 100. The battery pack 200 is used to provide electric energy to the electric drive system and the electric control system. The electric control system is used to receive the driver's operation signal and cooperate with the electric drive system to drive the electric vehicle.

[0043] In the related art, the largest surface of the battery cells in the battery pack is directed toward the chassis to reduce the impact force on the largest surface of the battery cells in the battery pack during a car collision, thereby improving the safety of the battery pack. Since a liquid cooling plate is usually provided in the battery pack near the chassis, cooling water is passed into the liquid cooling plate, which has a better cooling effect on the battery cells in the lower layer of the battery pack. The cooling effect of the battery cells in the upper layer of the battery pack is relatively general, making the battery cells in the upper layer of the battery pack more susceptible to thermal runaway. When the battery cells in the upper layer of the battery pack experience thermal runaway, the high-temperature and high-pressure gas ejected from the battery cells is likely to be ejected from above the battery pack, directly affecting the safety of passengers.

[0044] Based on the above problems, this embodiment further provides a battery pack 200, which can prevent high-temperature and high-pressure gas from spraying out from above the battery pack 200 when thermal runaway occurs in the battery pack 200, thereby improving the safety of the electric vehicle.

[0045] For the convenience of description, in the following, the plane formed by the first direction and the second direction is parallel to the surface where the chassis 100 is located, and the first direction is along the length direction of the electric vehicle, and the second direction is along the width direction of the electric vehicle; the height direction is perpendicular to the surface where the chassis 100 is located, and the height direction is consistent with the thickness direction of the battery cell, and the thickness direction of the battery cell is perpendicular to the largest surface of the battery cell, and the plane formed by the first direction and the second direction is parallel to the largest surface of the battery cell. Of course, it can be understood that in other embodiments, the first direction is along the width direction of the electric vehicle, and the second direction is along the length direction of the electric vehicle.

[0046] Figure 2 FIG. 2 shows an exploded schematic diagram of a battery pack 200 provided in this embodiment. Figure 2 As shown, the battery pack 200 includes a box body 1, a battery module 2 and a heat-resistant component 3. The battery module 2 is composed of a plurality of battery cells 211. Several battery modules 2 are arranged in a first direction in the box body 1. A heat-resistant component 3 is provided between adjacent battery modules 2. The heat-resistant component 3 is used to reduce the mutual influence between adjacent battery modules 2 and improve the stability and safety of the battery pack 200.

[0047] When the battery pack 200 is installed on the chassis 100 of the electric vehicle, the largest surface of the box body 1 faces the chassis 100 of the electric vehicle, which facilitates the installation of the battery pack 200 and can fully utilize the space on the chassis 100 to improve space utilization.

[0048] In order to facilitate the assembly of the battery pack 200, the case 1 includes a first shell 11 and a second shell 12 that are sealed together, and the largest surface of the first shell 11 and the second shell 12 is the largest surface of the case 1. In some embodiments, the first shell 11 and the second shell 12 can be sealed by setting a sealing gasket between the mating surfaces to achieve sealing between the two. In other embodiments, the mating surfaces of the first shell 11 and the second shell 12 can also be sealed by filling the sealant. The case 1 is preferably a casting, specifically, the first shell 11 and the second shell 12 are both castings, which is not only convenient for processing and low in cost, but also has high structural strength, good stability and long service life.

[0049] In some embodiments, in order to facilitate the assembly of the heat-resistant component 3 and the box body 1, a plurality of first support beams 111 spaced along the first direction are provided on the largest surface of the first shell 11, and a second support beam (not shown in the figure) corresponding to the first support beam 111 is provided on the largest surface of the second shell 12, and the two ends of the heat-resistant component 3 are respectively fixed on the first support beam 111 and the second support beam. Further, mounting grooves 32 are provided on the top and bottom surfaces of the heat-resistant component 3, and the heat-resistant component 3 and the first support beam 111 and the second support beam can be connected at the mounting grooves 32 by fasteners or raised columns 1111. In some embodiments, the number of mounting grooves 32 on the heat-resistant component 3 is multiple, and the number of raised columns 1111 on the first support beam 111 and the second support beam is also multiple, and they are arranged one-to-one corresponding to the mounting grooves 32.

[0050] Figure 3 FIG. 2 shows an exploded schematic diagram of a battery cell 211 provided in this embodiment. Figure 3 As shown, the battery cell 211 includes a shell 2111, a battery cell, an end cover and an explosion-proof valve 2113. The battery cell is arranged in the shell 2111, the end cover is sealed on the opening of the shell 2111, and the explosion-proof valve 2113 is installed on the end cover. The explosion-proof valve 2113 is used to eject high-temperature and high-pressure gas, flames, and ignited particles from the explosion-proof valve 2113 when thermal runaway occurs in the battery cell 211. In some embodiments, the battery cell is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, and the separator is an insulating separator.

[0051] Figure 4 FIG. 2 shows a schematic diagram of an exploded view of the internal structure of the battery pack 200 provided in this embodiment in one case. Figure 4As shown, in the box body 1, a plurality of battery modules 2 are arranged along a first direction, and the battery module 2 includes a plurality of layers of battery packs 21 stacked along a height direction, and each layer of battery pack 21 is composed of a plurality of battery cells 211 arranged along a second direction. The first direction and the second direction are both arranged parallel to the maximum surface of the box body 1, and the first direction and the second direction are perpendicular to each other, and the height direction is arranged perpendicular to the maximum surface of the box body 1, so as to ensure that the maximum surface of the battery cell 211 in the battery module 2 is parallel to the chassis 100, reduce the collision force borne by the maximum surface of the battery cell 211, and improve the safety of the electric vehicle.

[0052] A heat-resistant component 3 is provided between two adjacent battery modules 2. The heat-resistant component 3 includes a plurality of heat-resistant parts 31 arranged along the height direction. The heat-resistant parts 31 are arranged opposite to the battery pack 21. Among all the heat-resistant parts 31, the heat-resistant part 31 close to the chassis 100 has a lower heat resistance than the other heat-resistant parts 31. In this way, when the battery pack 200 has thermal runaway, the heat-resistant part 31 with lower heat resistance will melt first, so that the high-temperature and high-pressure gas will flow to the heat-resistant part 31 with lower heat resistance first, thereby preventing the high-temperature and high-pressure gas from flowing to the top of the battery pack 200, reducing the impact of the high-temperature and high-pressure gas on passengers, and improving the safety of the electric vehicle.

[0053] Figure 5 FIG. 2 shows a partial structural diagram of a heat-resistant component 3 provided in an embodiment. Figure 5 As shown, in one heat-resistant component 3, the side of the heat-resistant portion 31 close to the chassis 100 facing the explosion-proof valve 2113 of the battery pack 21 has a concave curved surface, and the side of the other heat-resistant portions 31 facing the explosion-proof valve 2113 of the battery pack 21 has a convex curved surface. In this way, the heat resistance of the heat-resistant portion 31 close to the chassis 100 can be lower than that of the other heat-resistant portions 31. Of course, in other embodiments, the number of heat-resistant portions 31 in one heat-resistant component 3 can also be three, four, five or more, and no examples are given here.

[0054] Furthermore, when both sides of the heat-resistant component 3 face the explosion-proof valve 2113 of the battery pack 21, the curved shapes of the two sides of the heat-resistant portion 31 are the same. The symmetrical shape of the heat-resistant component 3 is not only easy to process, but also can improve the structural strength of the heat-resistant component 3.

[0055] In addition, the concave and convex surfaces of the heat-resistant portion 31 can form a channel extending along the second direction. When the battery pack 200 experiences thermal runaway, high-temperature and high-pressure gas can be discharged from the channel, reducing the impact of the high-temperature and high-pressure gas on other battery cells 211.

[0056] Figure 6 FIG. 2 shows a partial structural diagram of another heat-resistant component 3 provided in the embodiment. Figure 6As shown, the thickness of the heat-resistant part 31 close to the chassis 100 is less than that of the remaining heat-resistant parts 31. With such a setting, the heat resistance of the heat-resistant part 31 close to the chassis 100 can be made less than that of the remaining heat-resistant parts 31. Of course, in other embodiments, the number of heat-resistant parts 31 in a heat-resistant member 3 can also be three, four, five or any number above, and no further examples will be given here. It can be understood that the heat-resistant member 3 can be an integral structure, as long as the thickness or shape of the heat-resistant member 3 is different, and the heat resistance of the heat-resistant part 31 close to the bottom of the battery pack in the heat-resistant member 3 is less than that of the remaining heat-resistant parts 31, which is not limited here.

[0057] Further, in a heat-resistant member 3, on one side of all heat-resistant parts 31 facing the explosion-proof valve 2113 of the battery pack 21, there are all U-shaped recesses, and the openings of the U-shaped recesses face the explosion-proof valve 2113 of the battery pack 21.

[0058] In addition, the U-shaped recesses of the heat-resistant parts 31 can all form channels extending in the second direction. When the battery pack 200 undergoes thermal runaway, the high-temperature and high-pressure gas can be discharged from this channel, reducing the impact of the high-temperature and high-pressure gas on other battery cells 211.

[0059] Furthermore, the heat-resistant member 3 includes a split structure composed of multiple split parts. The heat-resistant part 31 includes split parts, and the heat resistance of the split parts is different; that is, different heat-resistant parts are prepared with different materials and then assembled.

[0060] The heat-resistant member 3 is made of a fireproof material; or the heat-resistant member 3 is made of a metal material, and the heat-resistant member 3 has a fireproof coating to improve the fire resistance of the heat-resistant member 3. In some embodiments, the heat-resistant member 3 is made of a fireproof material such as mica and can withstand flames or high temperatures above 500 °C. In other embodiments, the fireproof member can also be made of metal materials such as steel and aluminum alloy, and then a refractory material coating layer is coated on the surface of the heat-resistant member 3, which can withstand the high-speed impact of high-temperature gases, particulate matter, etc. ejected during the thermal runaway of the battery cell 211. It can be understood that as long as the heat resistance of the heat-resistant part 31 close to the bottom of the battery pack in the heat-resistant member 3 is less than that of the remaining heat-resistant parts 31, which is not limited here.

[0061] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art of this industry should understand that the above embodiments do not limit the present application in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present application.

Claims

1. A battery pack, characterized in that: Comprising: A battery module (2), a plurality of the battery modules (2) are arranged in a first direction. The battery module (2) includes a plurality of battery packs (21) stacked in a height direction. Each layer of the battery pack (21) is composed of a plurality of battery cells (211) arranged in a second direction. The first direction and the second direction are perpendicular to each other, and the height direction is consistent with the thickness direction of the battery cell (211); The battery cell (211) includes an explosion-proof valve (2113); A heat-resistant member (3), the heat-resistant member (3) includes a plurality of heat-resistant parts (31) arranged in the height direction. The heat-resistant parts (31) are arranged opposite to the explosion-proof valves (2113) of the battery packs (21). Among all the heat-resistant parts (31), the heat-resistant degree of the heat-resistant part (31) close to the bottom of the battery pack is less than that of the remaining heat-resistant parts (31).

2. The battery pack according to claim 1, characterized in that: In one heat-resistant member (3), the side surface of the heat-resistant part (31) close to the bottom of the battery pack facing the explosion-proof valve (2113) of the battery pack (21) has a concave curved surface, and the side surfaces of the remaining heat-resistant parts (31) facing the explosion-proof valves (2113) of the battery packs (21) have convex curved surfaces.

3. The battery pack according to claim 2, characterized in that: The explosion-proof valves (2113) of two adjacent battery modules (2) both face the heat-resistant member (3). Both side surfaces of the heat-resistant member (3) include a plurality of heat-resistant parts (31) arranged in the height direction, and the heat-resistant parts (31) on both side surfaces are symmetrically arranged.

4. The battery pack according to claim 1, characterized in that: In one heat-resistant member (3), the thickness of the heat-resistant part (31) close to the bottom of the battery pack is less than that of the remaining heat-resistant parts (31).

5. The battery pack according to claim 4, characterized in that: One side surface of each heat-resistant part (31) facing the explosion-proof valve (2113) of the battery pack (21) has a U-shaped concave portion, and the opening of the U-shaped concave portion faces the explosion-proof valve (2113) of the battery pack (21).

6. The battery pack according to claim 1, characterized in that: The heat-resistant member (3) includes an integral structure or a split structure; Or, the heat-resistant member (3) includes a split structure composed of a plurality of split parts. The heat-resistant part (31) includes the split parts, and the heat-resistant degrees of the split parts are different.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery pack includes a box body (1). The box body (1) includes a first shell (11) and a second shell (12) in sealed cooperation. The largest surface of the first shell (11) and the second shell (12) is the largest surface of the box body (1); the plane where the explosion-proof valve (2113) is located is perpendicular to the largest surface of the box body (1).

8. The battery pack according to claim 7, characterized in that: A plurality of first support beams (111) are arranged at intervals in the first direction on the largest surface of the first shell (11). Second support beams corresponding to the first support beams (111) are provided on the largest surface of the second shell (12). Both ends of the heat-resistant member (3) are fixed to the first support beam (111) and the second support beam respectively.

9. The battery pack according to claim 7, characterized in that: Mounting grooves (32) are provided on the two end surfaces of the heat-resistant member (3) in the height direction. The heat-resistant member (3) is fixedly connected to the box body (1) at the mounting grooves (32).

10. An electric vehicle, characterized in that: It comprises a chassis (100) and a battery pack as claimed in any one of claims 1 to 9, wherein the battery pack is mounted on the chassis (100), and the plane where the explosion-proof valve (2113) is located is perpendicular to the plane where the chassis (100) is located.

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