JP2020004568A - Battery pack and electric vehicle - Google Patents

Abstract

To provide a battery pack capable of reliably draining water inside a case even when a vehicle is accelerating, decelerating, or turning left and right, and an electric vehicle including the battery pack.SOLUTION: In a battery packs 30, at least a set of a water detection sensor and a drain pump 42 is provided in a front end and a rear end in the vehicle traveling direction inside a case 33, and one of the front end and the rear end is located at one end in the vehicle width direction inside the case 33, and the other one is located at the other end in the vehicle width direction inside the case 33.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery pack and an electric vehicle including the battery pack.

  2. Description of the Related Art Conventionally, a battery pack that outputs a predetermined voltage and capacity by accommodating a plurality of batteries in a case has been known (see Patent Literatures 1 and 2). The battery pack is used, for example, in an electric vehicle and the like, and is prevented from being wet by a cover so as not to cause a short circuit due to a conductive liquid such as water. In addition, in order to suppress a short circuit due to vehicle inundation, the height of the edge of the case is set at a predetermined position, thereby preventing a short circuit due to liquid.

  On the other hand, for a battery pack outside the cabin such as a BEV, a sealing member sandwiched between the battery case and the cover forms a waterproof partition against water intrusion from outside the vehicle, thereby preventing a short circuit. Furthermore, when a water cooling circuit exists inside the battery pack, it is necessary to protect the live parts from short circuit against water leakage from the water cooling circuit, so that the junction board, the battery ECU and the battery ECU are waterproof. Countermeasures such as placement in areas where water does not flow are taken.

  The outer case described in Patent Literature 1 includes a battery module, a sensor that detects water that has entered the inside of the outer case, and a lid that discharges water. When the sensor detects water intrusion, the lid is opened in conjunction with the detection signal and the water is discharged. Patent Document 2 discloses a technique of draining water from inside a battery pack using a drain pump.

JP-T-2013-080567A JP-A-2006-146236

  However, if the active parts such as the junction board, battery ECU, and battery module are designed to be protected from short circuit by conductive liquid like the battery pack described above, passive safety measures can be taken. This leads to size enlargement. Further, even when the vehicle is provided with a lid for discharging water as described in Patent Literature 1 or is provided with a drainage pump as described in Patent Literature 2, it does When decelerating or turning left and right, water inside the case moves to a position biased with respect to the case, so that it is difficult to perform sufficient drainage.

  The present invention provides a battery pack capable of reliably draining water inside a case even when the vehicle is accelerating, decelerating, or turning left and right, and an electric vehicle including the battery pack. With the goal.

  (1) The present invention relates to a driving battery pack (for example, a later-described battery pack 30) for driving an electric vehicle (for example, a later-described vehicle 1), and a driving battery (for example, a later-described battery 31), A case (for example, a case 33 to be described later) for accommodating a driving battery, and a water detection sensor (for example, a water detection sensor 41 to be described later) is provided on a bottom surface (for example, a bottom surface 333 to be described later) of the case; A drain pump (e.g., a drain pump 42 described later) for discharging water (e.g., water W described below) inside the case to the outside of the case, and the water detection sensor and the drain pump A front end portion and a rear end portion in the vehicle traveling direction inside the case, and one of the front end portion and the rear end portion is located at one end portion in the vehicle width direction inside the case; The front end portion and the other of the parts and the rear end portion is positioned at the other end portion in the vehicle width direction inside of the case and said rear end, a battery pack is arranged by at least one set.

  (2) In the battery pack of (1), a plurality of the driving batteries are juxtaposed in the vehicle traveling direction or the vehicle width direction inside the case, and an outer shape of the case has a rectangular shape in plan view. At least one of the four corners of the case has a chamfered portion (for example, a chamfered portion 331 described later) having a shape with a corner removed, and the water detection sensor and the drainage are provided inside the case in the chamfered portion. Preferably, a pump is arranged.

  (3) In the battery pack of (2), the chamfered portion includes at least a vehicle body frame (for example, a main frame 13 described later), a suspension (for example, a rear suspension device 20 described later), and wheels (for example, left and right described later). It is preferable to be arranged near one of the rear wheels LWr, RWr).

  (4) In the battery pack of (3), the vehicle body frame extends from the front to the rear of the vehicle, and a widened portion extending from the inside to the outside of the vehicle from the front to the rear of the vehicle (for example, It is preferable that the case has a widened portion 131), and the chamfered portion of the case is arranged along the widened portion.

(5) In the battery packs of (1) to (4), at least one cross member (for example, a cross member 36 described later) extending in the vehicle width direction is provided inside the case, and the cross member and the cross member are provided. It is preferable that a gap through which water can flow (for example, a gap 335 described later) is formed between the bottom of the case and the case.
(6) The present invention is an electric vehicle including the battery pack according to any one of (1) to (5).

  According to the present invention, a battery pack capable of reliably draining water inside a case even when the vehicle is accelerating, decelerating, or turning left and right, and an electric vehicle including the battery pack are provided. can do.

1 is a schematic diagram illustrating an electric vehicle including a battery pack according to a first embodiment of the present invention. It is a top view showing the battery pack concerning a 1st embodiment of the present invention. FIG. 3 is an enlarged plan view illustrating a portion where one drainage pump is provided in the battery pack according to the first embodiment of the present invention. FIG. 4 is an enlarged plan view illustrating a portion where the other drain pump is provided in the battery pack according to the first embodiment of the present invention. It is a side sectional view showing the battery pack concerning a 1st embodiment of the present invention. FIG. 2 is an enlarged side cross-sectional view showing a portion where a drain pump is provided in the battery pack according to the first embodiment of the present invention. It is a figure showing the circuit composition which drives the drain pump in the battery pack concerning a 1st embodiment of the present invention. It is a schematic diagram showing operation of a drain pump and a drain pump in a battery pack concerning a 1st embodiment of the present invention. It is a principal part schematic diagram showing the electric vehicle provided with the battery pack concerning a 2nd embodiment of the present invention.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In the description of the second and subsequent embodiments, the same reference numerals are given to configurations and the like common to the first embodiment, and description thereof will be omitted.

[First Embodiment]
FIG. 1 is a schematic diagram showing an electric vehicle including a battery pack.
The vehicle 1 according to the present embodiment is an electric vehicle (electric vehicle (EV)) that drives left and right front wheels LWf and RWf using a motor configured by a motor having a rotor and a stator as a power source.

  The vehicle 1 includes a battery pack 30 and includes a driving device including an electric motor, an electronic control unit (hereinafter, referred to as “ECU”) (not shown) as a control unit that controls the electric motor, and a PDU (power not shown). Drive unit). The electric motor drives front wheels Wf (RWf, LWf) via left and right front drive shafts.

  The electric motor is, for example, a three-phase AC motor having a U-phase, a V-phase, and a W-phase, and generates torque for running the vehicle 1 by using the electric power stored in the battery pack 30. The electric motor is connected to the battery pack 30 via a PDU having an inverter. When the driver depresses the accelerator pedal and the brake pedal, the control signal from the ECU is input to the PDU, so that the power supply from the battery pack 30 to the electric motor and the energy regeneration from the electric motor to the battery pack 30 are performed. Controlled.

  Each of the front wheel Wf (RWf, LWf) and the rear wheel Wr (RWr, LWr) is suspended by a vehicle suspension device, and the vehicle suspension device for suspending the rear wheel Wr (RWr, LWr) is a multi-link type. Of the rear suspension device 20.

  The rear suspension device 20 includes a knuckle 21 to which the rear wheels Wr (RWr, LWr) are rotatably mounted, an upper arm (not shown) and a leading arm 23 extending outward from the vehicle body to the vehicle width and supporting the upper portion of the knuckle 21. The lower arm and the trailing arm 24 (not shown) extend outward from the vehicle body width and support the lower portion of the knuckle 21, and are passed to the vehicle body 10 and the upper portion of the knuckle 21, and are input from the rear wheels Wr (RWr, LWr). The shock absorber includes a damper unit (shock absorber) (not shown) for absorbing a shock to be applied, and a stabilizer (not shown) which is passed over the vehicle body 10 and the knuckle 21 and stabilizes the vehicle body 10. The ends of the upper arm, the leading arm 23, the lower arm, and the trailing arm 24 are respectively connected via rubber bush joints 26 to portions of the vehicle body 10 near the chamfered portions 331 of the case 33 described later (in four corners in plan view). The case 33 having a shape with corners removed is connected to the floor pan 11 of the vehicle body 10 at the cut-off position.

  Further, a friction brake (not shown) is provided on each of the front wheels Wf (RWf, LWf) and the rear wheels Wr (RWr, LWr). This friction brake is constituted by, for example, a hydraulic disc brake. When the driver depresses the brake pedal, the depressing force is amplified and transmitted to the brake pad via a hydraulic cylinder or the like, and a frictional force is generated between the brake disc attached to each drive wheel and the brake pad. Then, braking of each drive wheel is performed.

Next, the configuration of each part of the battery pack 30 of the vehicle 1 according to the present embodiment will be described.
FIG. 2 is a plan view showing the battery pack. FIG. 3 is an enlarged plan view showing a portion of the battery pack where one drain pump is provided. FIG. 4 is an enlarged plan view showing a portion of the battery pack where the other drainage pump is provided. FIG. 5 is a side sectional view showing the battery pack. FIG. 6 is an enlarged side sectional view showing a portion of the battery pack where a drain pump is provided. FIG. 7 is a diagram showing a circuit configuration for driving a drain pump in the battery pack.

  The battery pack 30 is provided on the floor pan 11 (see FIG. 1) of the vehicle body 10 having the monocoque structure, and is provided on the floor pan 11 and extends from the front to the rear of the vehicle 1 to form a load path frame. It is provided between a pair of main frames 13. The battery pack 30 includes a battery 31 for driving an electric motor, and a case 33 that houses the battery 31.

  As shown in FIG. 2, the case 33 has a substantially rectangular shape having a chamfered portion 331 having a shape in which four corners are removed in plan view, and has a substantially rectangular parallelepiped shape in which the front surface of the upper surface is open. have. The longitudinal direction of the case 33 having a substantially rectangular shape in plan view is the front-back direction of the vehicle 1 (the left-right direction in FIG. 2, the right direction in FIG. 2 is the front direction of the vehicle 1, and the left direction in FIG. 2 is the vehicle). 1 is the rear direction), and the width direction of the case 33 is disposed in the vehicle 1 in a positional relationship corresponding to the width direction of the vehicle 1. The front portion of the main frame 13 has a widened portion 131 extending from the inside to the outside of the vehicle 1 from the front to the rear of the vehicle 1, but the two chamfered portions 331 on the front side of the battery pack 30 are It is arranged along 131. A cover 35 is attached to the upper part of the case 33 so as to close the opening of the case 33.

  A plurality of storage battery cells are accommodated inside the case 33 closed by the cover 35. As shown in FIG. 2, the case 33 is provided with a cross member 36 extending in the vehicle width direction, and a plurality of storage battery cells are grouped into one group to form the battery 31. And are juxtaposed in the vehicle traveling direction and the vehicle width direction.

  As shown in FIG. 8, the lower portion of the cross member 36 and the bottom surface 333 of the case 33 are separated from each other, so that the lower portion of the cross member 36 and the bottom surface 333 of the case 33 are viewed from above. Thus, a gap 335 (see FIGS. 5 and 8) through which water W can flow is formed between one side and the other side (the left and right sides of the cross member 36 in FIG. 8) with the cross member 36 as a boundary. Thus, the water W that has entered the case 33 can flow through the gap 335 to the front end or the rear end in the vehicle traveling direction inside the case 33. The water W that has entered the inside of the case 33 can flow to one end or the other end in the vehicle width direction because the inside of the case 33 is not partitioned in the vehicle width direction.

  On the bottom surface 333 of the case 33, a set of a water detection sensor 41 and a drainage pump 42 for discharging the water W inside the case 33 to the outside of the case 33 is provided. One set of one water detection sensor 41 and one drainage pump 42 is arranged inside the case 33 in the chamfered part 331 of the case 33 one by one.

  More specifically, a set of one water detection sensor 41 and one drainage pump 42 is provided at two locations. As shown in FIG. 2, one of the two places is a case 33 inside the case 33 in a right front (upper left in FIG. 2) chamfered part 331 among four chamfered parts 331 having a substantially rectangular shape in plan view. On the bottom surface 333. The other one of the two places is the bottom surface 333 of the case 33 inside the case 33 in the left rear (lower right in FIG. 2) chamfered part 331 of the four chamfered parts 331 having a substantially rectangular shape in plan view. Above. That is, the water detection sensor 41 and the drain pump 42 are located at the front end and the rear end in the vehicle traveling direction inside the case 33, and one of the front end and the rear end is the vehicle inside the case 33. It is located at one end in the width direction, and the other of the front end and the rear end is located inside the case 33 at the other end in the vehicle width direction.

  The water detection sensor 41 is fixed on the bottom surface 333 of the case 33 and detects the presence or absence of water W that has entered the inside of the case 33. The drain pump 42 is connected to one end of the first pipe member 44 as shown in FIG. The other end of the first tube member 44 is connected via a one-way valve 45 to one end of a second tube member 46 extending to the outside of the battery pack 30. The one-way valve 45 allows the flow of the water W from the first pipe member 44 to the second pipe member 46, but the reverse flow, that is, the flow of the water W from the second pipe member 46 to the first pipe member 44. Block the flow. The other end of the second tube member 46 is located outside the battery pack 30.

  The circuit configuration for driving the drain pump 42 by detecting the water W inside the case 33 by the water detection sensor 41 is as shown in FIG. The water detection sensor 41 is configured by a known analog circuit through which a current flows when immersed in water W, and is electrically connected to the base of the NPN transistor 51. The water detection sensor 41 is electrically connected to a positive electrode of the DC power supply 52. The negative electrode of the DC power supply 52 and the emitter of the NPN transistor 51 are electrically connected to the main frame 13 and the like of the vehicle body 10 and thus are grounded (GND).

  The collector of the NPN transistor 51 is electrically connected to the drain pump 42, and the drain pump 42 is electrically connected to the positive electrode of the DC power supply 53. The negative electrode of the DC power supply 53 is dropped to ground (GND) by being electrically connected to the main frame 13 of the vehicle body 10 or the like. With the above circuit configuration, when a predetermined potential difference is generated between the base and the emitter, a current flows between the collector and the emitter, and the drain pump 42 is driven.

  As shown in FIG. 2, a cooling water flow path constituted by a pipe member 38 is formed inside the case 33 of the battery pack 30. An electric pump (not shown) is connected to the cooling water flow path. When the electric pump is driven, the cooling water inside the tube member 38 circulates through the tube member 38 and can cool the inside of the battery pack 30.

The operation of discharging the conductive liquid from the inside of the case 33 to the outside when the conductive liquid such as water W enters the inside of the case 33 of the battery pack 30 as described above is as follows. FIG. 8 is a schematic diagram showing the operation of the drain pump and the drain pump in the battery pack.
First, when water W, which is a conductive liquid, enters the inside of the case 33, the water W flows on the bottom surface 333 of the case 33. When the vehicle 1 accelerates while the vehicle 1 is running, the water W flows inside the case 33 to a position at the rearmost end of the case 33. At this time, the water detection sensor 41 (the water detection sensor 41 at the right end in FIG. 8) located near the left rear of the vehicle 1 (the lower right end of the battery pack 30 in FIG. 2) is immersed in the water W, thereby The drain pump 42 located on the left rear side of FIG. 1 (the lower right end of the battery pack 30 in FIG. 2) starts driving. Thereby, the water W that has entered the inside of the case 33 is discharged to the outside of the case 33 through the drain pump 42, the first pipe member 44, the one-way valve 45, and the second pipe member 46.

  When the vehicle 1 decelerates while the vehicle 1 is traveling, the water W flows inside the case 33 to the frontmost position of the case 33. At this time, the water detection sensor 41 (the water detection sensor 41 at the left end in FIG. 8) located near the right front of the vehicle 1 (the upper left end of the battery pack 30 in FIG. 2) is immersed in the water W, thereby The drain pump 42 located on the right front side of FIG. 1 (the upper left end of the battery pack 30 in FIG. 2) starts driving. Thereby, the water W that has entered the inside of the case 33 is discharged to the outside of the case 33 through the drain pump 42, the first pipe member 44, the one-way valve 45, and the second pipe member 46.

  When the vehicle 1 travels at a constant speed while the vehicle 1 is traveling, the water W spreads over the entire bottom surface 333 inside the case 33. At this time, the water detection sensor 41 (the water detection sensor 41 at the right end in FIG. 8) located near the left rear of the vehicle 1 (the lower right end of the battery pack 30 in FIG. 2) and the right front of the vehicle 1 (FIG. The water detection sensor 41 (the water detection sensor 41 at the left end in FIG. 8) located at the upper left end of the battery pack 30 in FIG. The drain pump 42 located at the lower right end of the battery pack 30 and the drain pump 42 located near the right front of the vehicle 1 (the upper left end of the battery pack 30 in FIG. 2) start driving. Thus, the water W that has entered the inside of the case 33 is discharged to the outside of the case 33 through the drain pump 42, the first pipe member 44, the one-way valve 45, and the second pipe member 46.

  When the vehicle 1 turns to the left while the vehicle 1 is traveling, the water W flows inside the case 33 to a position on the right end of the case 33. At this time, the water detection sensor 41 (the water detection sensor 41 at the left end in FIG. 8) located closer to the front right of the vehicle 1 (the upper left end of the battery pack 30 in FIG. 2) is immersed in the water W, thereby ( The drain pump 42 located at the upper left end of the battery pack 30 in FIG. 2 starts driving. Thereby, the water W that has entered the inside of the case 33 is discharged to the outside of the case 33 through the drain pump 42, the first pipe member 44, the one-way valve 45, and the second pipe member 46.

  When the vehicle 1 turns right while the vehicle 1 is running, the water W flows inside the case 33 to a position on the left end of the case 33. At this time, the water detection sensor 41 (the water detection sensor 41 at the right end in FIG. 8) located near the left rear of the vehicle 1 (the lower right end of the battery pack 30 in FIG. 2) is immersed in the water W, thereby The drain pump 42 located on the left rear side of FIG. 1 (the lower right end of the battery pack 30 in FIG. 2) starts driving. Thus, the water W that has entered the inside of the case 33 is discharged to the outside of the case 33 through the drain pump 42, the first pipe member 44, the one-way valve 45, and the second pipe member 46.

According to the present embodiment, the following effects can be obtained.
In the present embodiment, the water detection sensor 41 and the drain pump 42 are the front end and the rear end in the vehicle traveling direction inside the case 33, and one of the front end and the rear end is the case 33. The front end and the rear end are located at one end in the vehicle width direction inside, and one set is arranged at the front end and the rear end located at the other end in the vehicle width direction inside the case 33. ing.

  Thereby, even if the water W that has entered the inside of the case 33 of the battery pack 30 moves inside the case 33 in accordance with the front, rear, left, and right behavior accompanying the traveling of the vehicle 1, the water detection sensor 41 and the water detection sensor 41 Since the drainage pump 42 is provided, the water can be drained from the inside of the case 33 with the minimum number of the water detection sensors 41 and the drainage pumps 42. As a result, active safety can be enhanced, and safety can be enhanced.

  The four corners of the case 33 have a chamfered portion 331 having a shape with the corners removed, and the water detection sensor 41 and the drainage pump 42 are disposed inside the case 33 in the chamfered portion 331.

  This makes it possible to effectively use the dead space generated by arranging the battery module (the battery 31 for driving the electric motor) configured by grouping a plurality of storage battery cells as one group.

  In the vicinity of the outside of the chamfered portion 331, the main frame 13 which is a body frame of the vehicle 1 and the rear suspension device 20 are arranged. Accordingly, when the main frame 13 and the rear suspension device 20 are located near the battery pack 30, a dead space occurs due to their presence. However, by disposing them near the chamfered portion 331, Dead space can be used effectively.

  Particularly, in the present embodiment, the chamfered portion 331 of the case 33 is arranged along the widened portion 131 of the main frame 13. Thus, the dead space generated by the shape of the widened portion 131 can be effectively used as a place where the chamfered portion 331 of the battery pack 30 is arranged.

  A cross member 36 extending in the vehicle width direction is provided inside the case 33, and a gap 335 through which water W can flow is formed between the cross member 36 and the bottom surface 333 of the case 33. I have. Thereby, the water W that has entered the inside of the case 33 flows from one end to the other end of the case 33 in the front-rear direction and the width direction of the vehicle 1 on the bottom surface 333 of the case 33 inside the case 33. It becomes possible. Therefore, when the vehicle 1 turns left or right while the vehicle 1 is traveling, or when the vehicle 1 accelerates or decelerates, the water detection sensor 41 detects the water W that has entered the inside of the case 33. , And that the water W is discharged by the drain pump 42 can be ensured.

[Second embodiment]
The battery pack 30 according to the second embodiment of the present invention differs from the battery pack 30 according to the first embodiment only in the position where the battery pack 30 is arranged in the vehicle 1.
FIG. 9 is a schematic diagram of a main part showing an electric vehicle including a battery pack.

  Specifically, the chamfered portion 331 of the battery pack 30 is arranged near the left and right rear wheels LWr, RWr. The front ends of the left and right rear wheels LWr and RWr on the inner side in the vehicle width direction are arranged at the cut-off positions of the case 33 having a shape in which four corners are removed in plan view. Thus, the dead space generated near the left and right rear wheels LWr and RWr can be effectively used as a place where the chamfered portion 331 of the battery pack 30 is arranged.

  It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

  For example, the vehicle 1 in the above embodiment is an electric vehicle (electric vehicle (EV)) that drives the left and right front wheels LWf, RWf using a motor as a power source as a power source, but is not limited thereto. For example, the vehicle may drive the left and right rear wheels LWr and RWr using the motor as a power source, or may drive the left and right front wheels LWf and RWf and the left and right rear wheels LWr and RWr.

  Further, the vehicle includes a hybrid vehicle (HEV) in which an internal combustion engine such as an engine and an electric motor are driven by the electric motor to drive wheels (right and left front wheels, left and right rear wheels), and an internal combustion engine such as an engine and an electric motor. An electric motor drives the wheels (front left and right wheels, rear left and right wheels), and a plug-in hybrid vehicle (PHEV) that can charge a battery from a power supply outside the vehicle via an insertion plug, or electricity generated by a fuel cell A fuel cell vehicle (FCV) in which the motor is driven by the motor, and the motor drives the wheels (right and left front wheels, left and right rear wheels), and electricity generated by the fuel cell and a battery from a power source outside the vehicle via a plug-in A plug-in fuel cell vehicle (PFCV) or the like, in which an electric motor is driven using the electricity charged to the vehicle and the electric motor drives wheels (left and right front wheels, left and right rear wheels).

  In addition, one of two places where a set of one water detection sensor 41 and one drainage pump 42 is provided is located at the front right (upper left in FIG. 2) of the four chamfers 331 that are substantially rectangular in plan view. ) On the bottom surface 333 of the case 33 inside the case 33 in the chamfered portion 331, and another one of the two portions is a left rear portion of the four chamfered portions 331 having a substantially rectangular shape in plan view (FIG. Although it was on the bottom surface 333 of the case 33 inside the case 33 in the chamfered portion 331 (lower right in FIG. 2), the position is not limited to this. Instead of being provided at this position, it may be provided at two places other than this position, and in addition to this position, it may be provided at one or two places other than this position.

  Further, in the second embodiment, the chamfered portion 331 of the battery pack 30 is arranged near the left and right rear wheels LWr, RWr, but is not limited to this configuration. For example, the chamfered portion 331 of the battery pack 30 may be arranged near the left and right front wheels LWf, RWf.

1: Vehicle 13: Main frame (body frame)
20 ... Rear suspension device (suspension)
Reference numeral 30: battery pack 31: battery (driving battery)
33 case 35 cover 36 cross member 41 water detection sensor 42 drainage pump 131 widening section 331 chamfered section 333 bottom surface 335 gap LWr, RWr left and right rear wheel W water

Claims (6)

A battery pack for driving an electric vehicle,
A driving battery;
A case accommodating the driving battery,
On the bottom surface of the case, a water detection sensor and a drain pump that discharges water inside the case to the outside of the case are provided,
The water detection sensor and the drain pump are a front end and a rear end in a vehicle traveling direction inside the case, and one of the front end and the rear end is a vehicle inside the case. At least one set of the front end and the rear end located at one end in the width direction and the other of the front end and the rear end located at the other end in the vehicle width direction inside the case; Battery packs placed one by one. Inside the case, the plurality of drive batteries are juxtaposed in the vehicle traveling direction or the vehicle width direction, and the outer shape of the case has a rectangular shape in plan view,
2. The case according to claim 1, wherein at least one of the four corners of the case has a chamfer having a shape with corners removed, and the water detection sensor and the drainage pump are arranged inside the case in the chamfer. The battery pack as described.   The battery pack according to claim 2, wherein the chamfered portion is disposed at least near one of a vehicle body frame, a suspension, and wheels of the vehicle. The vehicle body frame extends from the front to the rear of the vehicle, and has a widened portion extending from the inside to the outside of the vehicle from the front to the rear of the vehicle,
The battery pack according to claim 3, wherein the chamfered portion of the case is arranged along the widened portion. At least one cross member extending in the vehicle width direction is provided inside the case,
The battery pack according to any one of claims 1 to 4, wherein a gap through which water can flow is formed between the cross member and the bottom surface of the case.   An electric vehicle comprising the battery pack according to claim 1.

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