阅读说明：本技术 蓄电池封装体及电动车辆 (Storage battery package and electric vehicle ) 是由 冈田知之 安田知史 板谷弘毅 于 2021-03-08 设计创作，主要内容包括：提供能够适当地检测热失控的发生,能够抑制蓄电池封装体的大型化的蓄电池封装体及电动车辆。蓄电池封装体具备：第一蓄电池壳体(10A),其在第一壳体罩(13)具有右贯通孔(13a)及左贯通孔(13b)；以及第二蓄电池壳体(20A),其在第一蓄电池壳体的上方与第一蓄电池壳体重叠配置,且在底板(23)具有右贯通孔(23a)及左贯通孔(23b)。蓄电池封装体具备：由右贯通孔构成的第一连通口(51)及由左贯通孔构成的第二连通口(52)；排气阀(53),其仅设置于第一蓄电池壳体及第二蓄电池壳体中的任一方,并在蓄电池封装体的内压高于规定值时开阀；以及温度传感器(55),其设置在与排气阀连接的气体流通路径上。(Provided are a battery pack and an electric vehicle, wherein the occurrence of thermal runaway can be appropriately detected, and the increase in size of the battery pack can be suppressed. The battery package comprises: a first battery case (10A) having a right through-hole (13a) and a left through-hole (13b) in a first case cover (13); and a second battery case (20A) that is disposed above the first battery case so as to overlap the first battery case, and that has a right through-hole (23a) and a left through-hole (23b) in a bottom plate (23). The battery package comprises: a first communication port (51) formed by a right through hole and a second communication port (52) formed by a left through hole; an exhaust valve (53) which is provided only in one of the first battery case and the second battery case and which opens when the internal pressure of the battery package is higher than a predetermined value; and a temperature sensor (55) provided on a gas flow path connected to the exhaust valve.)

1. A battery package is provided with:

a first battery case that accommodates the plurality of cells; and

a second battery case that is disposed above the first battery case so as to overlap the first battery case and that accommodates a plurality of cells,

wherein the content of the first and second substances,

the first battery case has a first through-hole in an upper surface,

the second battery case has a second through-hole in a bottom surface thereof, the second through-hole communicating with the first through-hole,

the battery package is provided with:

a communication port formed by the first through-hole and the second through-hole;

an exhaust valve provided only in one of the first battery case and the second battery case, and opened when an internal pressure of the battery package is higher than a predetermined value; and

and a temperature sensor provided on a gas flow path connected to the exhaust valve.

2. The battery package according to claim 1,

the temperature sensor is disposed in the vicinity of the exhaust valve or in the vicinity of the communication port.

3. The battery package according to claim 1 or 2,

the plurality of cells housed in the first battery case and the plurality of cells housed in the second battery case are respectively provided with air release valves on upper surfaces thereof,

the exhaust valve is arranged on the second storage battery shell.

4. The battery package according to any one of claims 1 to 3,

a conductive member that electrically connects the plurality of cells housed in the first battery case and the plurality of cells housed in the second battery case is disposed in the communication port.

5. An electric vehicle provided with the battery pack according to any one of claims 1 to 4,

the battery package is disposed under the floor panel,

the exhaust valve is provided at a side portion of the battery pack in the vehicle width direction.

6. The electric vehicle according to claim 5,

a floor surface of the floor, which is opposed to the exhaust valve, is inclined downward as it is farther from the exhaust valve.

7. The electric vehicle according to claim 5 or 6,

the first battery case includes at least two battery modules arranged in a row in a front-rear direction of the electric vehicle,

the communication port is disposed between two battery modules adjacent in the front-rear direction.

8. The electric vehicle according to any one of claims 5 to 7,

a plurality of battery modules in which the plurality of cells are stacked are housed in the first battery case,

the communication port is disposed further outward in the vehicle width direction than the battery module that is located outermost in the vehicle width direction.

9. The electric vehicle according to any one of claims 5 to 8,

the battery pack is disposed below the rear seat,

the floor panel has a vertical wall portion facing the battery package in front of the battery package.

10. The electric vehicle according to claim 9,

a fuel tank is provided behind the battery pack.

11. The electric vehicle according to claim 10,

the exhaust valve is disposed at a front end portion of a side portion of the second battery case.

Technical Field

The present invention relates to a battery pack and an electric vehicle having the battery pack mounted thereon.

Background

Conventionally, an electric vehicle using a motor as a driving source is known. In such an electric vehicle using a motor as a drive source, a plurality of battery modules each including a plurality of stacked battery cells are arranged inside a battery case, and power is supplied to the motor.

Since a battery pack mounted in an electric vehicle is sometimes used in an extremely severe environment, it is also considered that heat generation called thermal runaway occurs in a battery cell due to an internal short circuit or the like. When thermal runaway occurs, the battery cell generates heat, and gas is released to the outside of the battery cell, that is, to the inside of the battery package, through a purge valve provided in the battery cell. In general, since the battery package is configured to have a sealed structure, when the pressure inside the battery package increases, it is necessary to discharge gas to the outside of the battery package.

For example, patent document 1 discloses a battery pack in which a duct portion is provided in a holder for fixing a battery module arranged vertically to a frame, and gas is led out from the duct portion to a discharge space inside a frame member.

Prior art documents

Patent document 1: japanese patent laid-open publication No. 2016-72171

However, when the duct portion is provided in the battery pack, the number of components increases, and the battery pack itself becomes larger. In addition, when thermal runaway of the battery cell occurs, it is desirable to appropriately detect the occurrence of the thermal runaway.

Disclosure of Invention

The invention provides a battery pack and an electric vehicle, which can appropriately detect the occurrence of thermal runaway and can inhibit the enlargement of the battery pack.

The present invention provides a battery package, comprising:

a first battery case that accommodates the plurality of cells; and

a second battery case that is disposed above the first battery case so as to overlap the first battery case and that accommodates a plurality of cells,

wherein the content of the first and second substances,

the first battery case has a first through-hole in an upper surface,

the second battery case has a second through-hole in a bottom surface thereof, the second through-hole communicating with the first through-hole,

the battery package is provided with:

a communication port formed by the first through-hole and the second through-hole;

an exhaust valve provided only in one of the first battery case and the second battery case, and opened when an internal pressure of the battery package is higher than a predetermined value; and

and a temperature sensor provided on the gas flow path.

The present invention is an electric vehicle including the battery pack, wherein,

the battery package is disposed under the floor panel,

the exhaust valve is provided at a side portion of the battery pack in the vehicle width direction.

Effects of the invention

According to the present invention, when thermal runaway of a battery cell occurs, gas can be appropriately discharged without increasing the size of a battery package, and the occurrence of thermal runaway can be appropriately detected at this time.

Drawings

Fig. 1 is a schematic side view of a vehicle mounted with a battery pack according to an embodiment of the present invention.

Fig. 2 is a perspective view of the battery pack of fig. 1.

Fig. 3 is an exploded perspective view of the battery pack of fig. 1.

Fig. 4 is a sectional view taken along line a-a of fig. 2.

Fig. 5 is a plan view of the battery pack with the first case cover and the second case cover removed.

Fig. 6 is a diagram illustrating a flow of gas when thermal runaway occurs in the battery cells of the first battery package.

Fig. 7 is a diagram illustrating a flow of gas when thermal runaway occurs in the battery cells of the second battery pack.

Fig. 8 is a plan view of the battery package according to the first modification example, in which the first case cover and the second case cover are removed.

Fig. 9 is a plan view of a battery package according to a second modification example in which the first case cover and the second case cover are removed.

Fig. 10 is a view showing the underfloor of the vehicle, illustrating the flow of gas discharged from the exhaust valve.

Description of reference numerals:

1a battery package;

2e a vertical wall part;

2f floor surface;

2, floor board;

8 a rear seat;

9 a fuel tank;

10A first battery case;

11F a first front battery module (battery module);

11R first rear battery module (battery module);

11a, 21a battery cells;

11b, 21b purge valves;

11a first battery module (battery module);

13a right through hole (first through hole);

23a right through hole (second through hole);

13b left through-hole (first through-hole);

23b left through hole (second through hole);

13a first case cover (upper surface of the first battery case);

a 20A second battery case;

23a bottom plate (bottom surface of the second battery case);

a 24L left side (lateral);

24R right side (lateral);

51 a first communication port;

52 a second communication port;

53R first exhaust valve;

a 53L second exhaust valve;

53 exhaust valve;

55a temperature sensor;

a 55A temperature sensor;

a 55B temperature sensor;

61 a first gas flow path (gas flow path);

62 a second gas flow path (gas flow path);

63 a third gas flow path (gas flow path).

Detailed Description

Hereinafter, a battery pack and an electric vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the drawing, the front of the electric vehicle is shown as Fr, the rear is shown as Rr, the left side is shown as L, the right side is shown as R, the upper side is shown as U, and the lower side is shown as D.

As shown in fig. 1, the vehicle V is partitioned by a floor panel 2 and a dash panel 3 into a vehicle compartment 4 and a luggage compartment 5, and a front compartment 6 in front thereof. A front seat 7 and a rear seat 8 are provided in the vehicle compartment 4. A drive device 100 is provided in the front chamber 6, the drive device 100 includes an engine and a motor as drive sources for driving the left and right front wheels FW, and a fuel tank 9 connected to the engine is provided below the luggage compartment 5. That is, the vehicle V is a so-called hybrid vehicle having both an engine and a motor as drive sources.

A battery pack 1 connected to a motor is disposed below a floor panel 2 of a vehicle interior 4. The floor 2 is composed of a front floor 2a below the front seat 7, a rear floor 2b below the rear seat 8, and a trunk floor 2c below the trunk room 5, and a bent portion 2d bent from the front floor 2a and a vertical wall 2e extending upward from the bent portion 2d are provided between the front floor 2a and the rear floor 2 b. The battery package 1 is disposed below the rear floor portion 2 b.

As shown in fig. 2 and 3, the battery pack 1 of the present embodiment includes a first battery pack 10 and a second battery pack 20 disposed on the first battery pack 10.

The first battery pack 10 includes a plurality of (six in this example) battery modules (hereinafter, referred to as "first battery modules") 11 and a first battery case 10A that houses the first battery modules 11. The first battery case 10A is composed of a first case body 12 and a first case cover 13 that closes an opening above the first case body 12.

As shown in fig. 3, the first battery module 11 is configured by stacking a plurality of battery cells 11a, two first battery modules 11 are arranged in the left-right direction in front of the first battery case 10A (hereinafter, these two first battery modules 11 may be referred to as a first front battery module 11F) such that the stacking direction of the battery cells 11a becomes the left-right direction, and four first battery modules 11 are arranged in the left-right direction from the center of the first battery case 10A toward the rear side such that the stacking direction of the battery cells 11a becomes the front-rear direction (hereinafter, these four first battery modules 11 may be referred to as a first rear battery module 11R).

The second battery pack 20 includes two battery modules (hereinafter, referred to as "second battery modules") 21 and a second battery case 20A that houses the second battery modules 21. The second battery case 20A includes a bottom plate 23 on which two second battery modules 21 are provided, and a second case cover 24 that covers the bottom plate 23.

The second battery module 21 is configured by stacking a plurality of battery cells 21a, and two second battery modules 21 are arranged in the second battery case 20A in a left-right direction such that the stacking direction of the battery cells 21a is the left-right direction.

The second battery case 20A is disposed above the first battery case 10A so as to overlap the first battery case 10A, and the second battery package 20 is disposed on the first battery package 10. The second battery pack 20 is disposed in front of the first battery pack 10. Therefore, as shown in fig. 1, the height of the battery pack 1 is high at the front and low at the rear, and is formed along the seat surface of the rear seat 8. Thus, the battery pack 1 can be disposed under the seat of the vehicle without impairing the comfort of the occupant.

As shown in fig. 3, right and left through holes 13a and 13b penetrating the first casing cover 13 are provided near both ends of the first casing cover 13 in the left-right direction. Right and left through holes 23a and 23b penetrating the bottom plate 23 are provided near both ends of the bottom plate 23 in the left-right direction of the second battery pack 20. The right through hole 13a of the first housing cover 13 and the right through hole 23a of the bottom plate 23 communicate with each other, and constitute a first communication port 51. The left through hole 13b of the first housing cover 13 and the left through hole 23b of the bottom plate 23 communicate with each other, and form a second communication port 52. Thereby, the internal spaces of the first battery case 10A and the second battery case 20A communicate with each other through the first communication port 51 and the second communication port 52. As shown in fig. 4, the conductive member 14 for electrically connecting the first battery module 11 and the second battery module 21 is disposed in the first communication port 51 and the second communication port 52. Thereby, the plurality of first battery modules 11 of the first battery case 10A and the plurality of second battery modules 21 of the second battery case 20A are electrically connected.

The first battery package 10 and the second battery package 20 are fastened and fixed in a sealed state by a fastening member, not shown, through the first case cover 13 of the first battery case 10A and the bottom plate 23 of the second battery case 20A.

(exhaust structure)

Next, the exhaust structure of the battery package 1 will be described with reference to fig. 2 to 8.

As shown in fig. 4, the gas release valves 11b and 21b are provided on the upper surfaces of the battery cells 11a of the first battery module 11 housed in the first battery case 10A and the battery cells 21a of the second battery module 21 housed in the second battery case 20A. When heat generation called thermal runaway occurs in the battery cells 11a and 21a due to an internal short circuit or the like and the internal pressure increases, gas is released to the outside of the battery cells 11a and 21a, that is, the inside of the battery package 1, through the vent valves 11b and 21 b.

Then, the battery pack 1 is provided with an exhaust valve 53 that opens when the internal pressure of the battery pack 1 becomes higher than a predetermined value. The exhaust valve 53 is provided in at least one of the first battery case 10A and the second battery case 20A. In the present embodiment, the two exhaust valves 53 are provided only in the second battery case 20A.

More specifically, as shown in fig. 5, the exhaust valve 53 includes a first exhaust valve 53R and a second exhaust valve 53L, the first exhaust valve 53R is disposed on the right side surface 24R of the second case cover 24 of the second battery case 20A, and the second exhaust valve 53L is disposed on the left side surface 24L of the second case cover 24 of the second battery case 20A.

Therefore, when thermal runaway occurs in any of the battery cells 11a in the first battery case 10A and gas is discharged, as shown in fig. 6, a part of the gas is discharged from the first gas discharge valve 53R mainly through the path between the right first battery module 11 and the right side surface of the first case main body 12 and the path between the first communication port 51 and the right second battery module 21 and the right side surface 24R of the second case cover 24 (arrows Y11 and Y12 in fig. 6). Hereinafter, this path may be referred to as a first gas flow path 61.

The surplus gas is discharged from the second exhaust valve 53L mainly through the path between the left first battery module 11 and the left side surface of the first case main body 12, the second communication port 52, and the path between the left second battery module 21 and the left side surface 24L of the second case cover 24 (arrows Y11, Y13 in fig. 6). Hereinafter, this path may be referred to as a second gas flow path 62.

As shown in fig. 7, when thermal runaway occurs in any of the battery cells 21a in the second battery case 20A and gas is discharged, the gas flows mainly through a path (hereinafter, sometimes referred to as a third gas flow path 63) between the rear surfaces of the left and right second battery modules 21 and the rear side surface 24B of the second case cover 24 (arrow Y21 in fig. 7), is discharged from the first exhaust valve 53R through the first gas flow path 61 of the second battery case 20A (arrow Y22 in fig. 7), and is discharged from the second exhaust valve 53L through the second gas flow path 62 (arrow Y23 in fig. 7).

As described above, the second battery case 20A is stacked on the first battery case 10A, the inside is communicated with each other by the first communication port 51 and the second communication port 52, and the exhaust valves 53 (the first exhaust valve 53R and the second exhaust valve 53L) are provided only in the second battery case 20A, whereby the number of the exhaust valves 53 can be reduced and the gas flow path can be defined. Therefore, even if a dedicated product such as a duct is not provided, the gas in the battery pack 1 can be discharged, and the increase in size of the battery pack 1 can be suppressed. Further, by providing the exhaust valve 53 in the second battery case 20A positioned on the second layer, gas can be efficiently exhausted from the exhaust valve 53 as compared with providing the exhaust valve 53 in the first battery case 10A. Further, the exhaust valve 53 can be disposed at a high position, and flooding of the exhaust valve 53 can be suppressed.

Further, by using the first communication port 51 and the second communication port 52 in which the conducting member 14 is arranged as the passages for the gas at the time of thermal runaway, it is not necessary to perform processing of a new through hole for establishing a gas flow path, and manufacturing cost and manufacturing man-hours can be reduced.

The first communication port 51 and the second communication port 52 are preferably disposed between the two left and right first front battery modules 11F disposed in front of the first battery case 10A and the four left and right first rear battery modules 11R disposed rearward from the center of the first battery case 10A in the front-rear direction. As a result, the influence of the gas discharged from any of the battery cells 11a in the first front battery module 11F on the first rear battery module 11R can be small, and the influence of the gas discharged from any of the battery cells 11a in the first rear battery module 11R on the first front battery module 11F can be small.

The first communication port 51 and the second communication port 52 are disposed outside the first battery module 11 and the second battery module 21 located on the outermost sides in the left-right direction (vehicle width direction). Therefore, the distance from the first communication port 51 to the first exhaust valve 53R and the distance from the second communication port 52 to the second exhaust valve 53L can be shortened.

The battery package 1 is provided with a temperature sensor 55 for detecting thermal runaway of the battery cells 11a and 21 a. In the present embodiment, as shown in fig. 5, one temperature sensor 55C is provided at substantially the center of the first battery case 10A, one temperature sensor 55A is provided in the vicinity of the first communication port 51 of the first battery case 10A and in the first gas flow path 61, one temperature sensor 55A is provided in the vicinity of the second communication port 52 of the first battery case 10A and in the second gas flow path 62, and one temperature sensor 55B is provided in the substantially center of the second battery case 20A in the left-right direction and in the third gas flow path 63.

Thus, even when thermal runaway occurs in any of the battery cells 11a in the first battery case 10A described with reference to fig. 6, the thermal runaway can be detected mainly by the temperature sensor 55A disposed in the first gas flow path 61 or the temperature sensor 55A disposed in the second gas flow path 62. Even when thermal runaway occurs in any of the battery cells 21a in the second battery case 20A described with reference to fig. 7, the thermal runaway can be detected mainly by the temperature sensor 55B disposed in the third gas flow path 63. In particular, since the two temperature sensors 55A are disposed in the vicinity of the first communication port 51 and the second communication port 52, thermal runaway can be detected early.

The number and arrangement of the temperature sensors 55 are not particularly limited, but it is desirable to be able to detect thermal runaway in the battery cell 11a of the first battery case 10A and thermal runaway in the battery cell 21a of the second battery case 20A with a small number of temperature sensors. Therefore, in the first modification example of fig. 8, one temperature sensor 55C is provided at substantially the center of the first battery case 10A, and one temperature sensor 55B is provided at substantially the center of the second battery case 20A in the left-right direction and on the third gas flow path 63.

In the second modification of fig. 9, one temperature sensor 55A is provided in the vicinity of the first exhaust valve 53R of the second battery case 20A and in the first gas flow path 61, and one temperature sensor 55A is provided in the vicinity of the second exhaust valve 53L of the second battery case 20A and in the second gas flow path 62. The two temperature sensors 55A are preferably disposed in the vicinity of the first exhaust valve 53R and the second exhaust valve 53L, respectively. This can improve the accuracy of detecting thermal runaway.

Note that, in the battery pack 1 of the present embodiment, since two communication ports (the first communication port 51 and the second communication port 52) and two exhaust valves 53 (the first exhaust valve 53R and the second exhaust valve 53L) are provided, at least two temperature sensors 55 are preferably provided, but in a battery pack including one communication port and one exhaust valve, at least one temperature sensor 55 may be provided in a gas flow path connected to the exhaust valve.

As described above, the battery pack 1 is disposed below the floor panel 2. At this time, the exhaust valve 53 is disposed on the side of the battery pack 1 so as to face the vehicle width direction. In the present embodiment, as shown in fig. 10, the second exhaust valve 53L is disposed on the left side surface 24L of the second housing cover 24 so as to face leftward. The first exhaust valve 53R is disposed on the right side surface 24R of the second casing cover 24 so as to face rightward in the vehicle width direction, and illustration thereof is omitted.

Thus, the gas is not directly discharged toward the floor 2 on the vehicle compartment side, and therefore, the influence of the gas on the vehicle compartment 4 can be suppressed. In particular, a vertical wall portion 2e facing the battery pack 1 is provided in front of the battery pack 1, and a fuel tank 9 is provided behind the battery pack 1. Therefore, the influence of the injected gas on the vehicle interior 4 can be suppressed, and the gas injected from the first exhaust valve 53R and the second exhaust valve 53L can be prevented from touching the fuel tank 9. The first exhaust valve 53R and the second exhaust valve 53L are preferably disposed at positions distant from the fuel tank 9, that is, at the front end portions of the right side surface 24R and the left side surface 24L of the second housing cover 24.

As shown in fig. 10, the floor surface 2f of the floor 2 facing the first exhaust valve 53R and the second exhaust valve 53L is preferably inclined downward as it is farther from the exhaust valve 53. This allows the gas discharged from the first exhaust valve 53R and the second exhaust valve 53L to be guided in a direction (downward) away from the vehicle interior 4 while being brought into contact with the floor surface 2 f.

The present invention is not limited to the above embodiments, and modifications, improvements, and the like can be appropriately made.

The battery pack of the present invention may further include an air conditioning duct such as an intake duct and an exhaust duct.

In the above embodiment, the hybrid vehicle is shown as an example of the vehicle, but the vehicle is not limited to this, and may be an electric vehicle such as an electric vehicle or a fuel cell vehicle as long as the vehicle has a battery.

In the present specification, at least the following matters are described. Although the corresponding components and the like in the above-described embodiment are shown in parentheses, the present invention is not limited to these.

(1) A battery package (battery package 1) is provided with:

a first battery case (first battery case 10A) that accommodates a plurality of cells (battery cells 11 a); and

a second battery case (second battery case 20A) that is disposed above the first battery case so as to overlap the first battery case and that houses a plurality of cells (battery cells 21a),

wherein the content of the first and second substances,

the first battery case has a first through-hole (a right through-hole 13a, a left through-hole 13b) in an upper surface (a first case cover 13),

the second battery case has a second through-hole (a right through-hole 23a, a left through-hole 23b) communicating with the first through-hole in a bottom surface (bottom plate 23),

the battery package is provided with:

communication ports (a first communication port 51 and a second communication port 52) which are formed by the first through-hole and the second through-hole;

an exhaust valve (exhaust valve 53) that is provided only in one of the first battery case and the second battery case and that opens when the internal pressure of the battery package is higher than a predetermined value; and

and a temperature sensor (temperature sensor 55) provided in the gas flow path (first gas flow path 61, second gas flow path 62, and third gas flow path 63) connected to the exhaust valve.

According to (1), the second battery case is superposed on the first battery case, the inside is communicated with each other through the communication port, and the gas release valve is provided only in one of the first battery case and the second battery case, whereby the number of gas release valves can be reduced, and the gas flow path can be defined. In this way, the gas is discharged without providing a duct, and the battery pack can be prevented from being enlarged. Further, by providing a temperature sensor in the gas flow path connected to the exhaust valve, the occurrence of thermal runaway can be appropriately detected.

(2) The battery package according to (1), wherein,

the temperature sensor is disposed in the vicinity of the communication port or in the vicinity of the exhaust valve.

According to (2), when the temperature sensor is disposed in the vicinity of the communication port, thermal runaway can be detected early. In addition, when the temperature sensor is disposed in the vicinity of the exhaust valve, the accuracy of detecting thermal runaway can be improved.

(3) The battery package according to (1) or (2), wherein,

the plurality of cells housed in the first battery case and the plurality of cells housed in the second battery case are respectively provided with air release valves (air release valves 11b, 21b) on upper surfaces thereof,

the exhaust valve is arranged on the second storage battery shell.

According to (3), since the gas easily flows upward, the gas release valve is disposed on the upper surface of each cell, and the gas can be effectively discharged from the gas release valve by providing the gas release valve in the second battery case located on the second floor. Further, the exhaust valve can be disposed at a high position, and flooding of the exhaust valve can be suppressed.

(4) The battery package according to any one of (1) to (3), wherein,

a conduction member (conduction member 14) that electrically connects the plurality of cells housed in the first battery case and the plurality of cells housed in the second battery case is disposed in the communication port.

According to (4), the communication port in which the conducting member is disposed is set to the gas passage, and therefore, it is not necessary to perform processing of a new communication port for establishing a gas flow path, and manufacturing cost and manufacturing man-hours can be reduced.

(5) An electric vehicle including the battery package according to any one of (1) to (4),

the battery package is disposed under a floor (floor 2),

the exhaust valve is provided at a side portion (a left side surface 24L, a right side surface 24R) of the battery pack in the vehicle width direction.

According to (5), since the exhaust valve is provided at the side portion of the battery package disposed below the floor panel, the gas is not directly exhausted toward the floor panel on the vehicle compartment side, and therefore the influence of the gas on the vehicle compartment can be suppressed. That is, damage to the floor under the seat or high temperature can be suppressed.

(6) The electric vehicle according to (5), wherein,

a floor surface (floor surface 2f) of the floor, which is opposed to the exhaust valve, is inclined downward as it is farther from the exhaust valve.

According to (6), since the floor surface facing the exhaust valve is inclined downward as it is separated from the exhaust valve, the gas discharged from the exhaust valve can be guided in a direction away from the vehicle interior while being caused to collide with the floor surface.

(7) The electric vehicle according to (5) or (6), wherein,

the first battery case includes at least two battery modules (a first front battery module 11F and a first rear battery module 11R) arranged in a front-rear direction of the electric vehicle,

the communication port is disposed between two battery modules adjacent in the front-rear direction.

According to (7), the influence of the discharged gas on the other battery module can be suppressed.

(8) The electric vehicle according to any one of (5) to (7), wherein,

a plurality of battery modules (battery modules 11) in which the plurality of cells are stacked are housed in the first battery case,

the communication port is disposed further outward in the vehicle width direction than the battery module that is located outermost in the vehicle width direction.

According to (8), the distance between the communication port and the exhaust valve provided at the side portion of the battery pack can be shortened.

(9) The electric vehicle according to any one of (5) to (8),

the battery package is disposed below the rear seat (rear seat 8),

the floor panel has a vertical wall portion (vertical wall portion 2e) facing the battery package in front of the battery package.

According to (9), since the floor panel has the vertical wall portion facing the battery package in front of the battery package, the influence of the gas on the vehicle interior can be further suppressed by providing the exhaust valve at the side portion of the battery package.

(10) The electric vehicle according to (9), wherein,

a fuel tank (fuel tank 9) is provided behind the battery pack.

According to (10), since the fuel tank is provided behind the battery pack, the gas ejected from the exhaust valve can be prevented from touching the fuel tank by providing the exhaust valve on the side portion of the battery pack.

(11) The electric vehicle according to (10), wherein,

the exhaust valve is disposed at a front end portion of a side portion of the second battery case.

According to (11), the purge valve can be separated from the fuel tank.