Battery storage device for electric vehicle

Abstract

The present invention introduces a battery storage device for an electric vehicle in which a case is provided below the vehicle floor to secure interior space, and the cooling structure is simplified and manufacturing costs are reduced by cooling the battery module using interior air.

Description

Technology Field

[0001] The present invention relates to a battery storage device for an electric vehicle having a battery module built-in and a cooling device for cooling the battery module. Background Technology

[0003] Recently, interest in eco-friendly vehicles has been rising due to factors such as environmental issues and high oil prices, and a variety of electric vehicles are being developed that use electric energy to power their operation.

[0004] These electric vehicles being developed include pure electric vehicles (battery-powered EVs), fuel cell electric vehicles (fuel cell EVs) that use fuel cells as electric motors, and hybrid electric vehicles (hybrid EVs) that use both an electric motor and an engine.

[0005] In particular, electric vehicles are equipped with battery modules for storing electrical energy, and these modules house multiple battery cell units inside a battery case. Since these battery cases are bulky and heavy, it is crucial to secure mounting space within the vehicle body to install them. Furthermore, as battery modules generate high temperatures during operation, cooling is required; however, the optimal design of battery cases that considers both the mounting space in the vehicle body and the cooling of the modules is currently lacking.

[0007] The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. Prior art literature

[0009] KR 10-2012-0094697 A (2012.08.27.) The problem to be solved

[0010] The present invention is proposed to solve these problems and aims to provide a battery storage device for electric vehicles in which an interior space is secured by providing a battery case below the vehicle floor, and the cooling structure is simplified and manufacturing costs are reduced by cooling the battery module using interior air. means of solving the problem

[0012] A battery storage device for an electric vehicle according to the present invention for achieving the above objective comprises: a case coupled to the lower part of the vehicle floor and having a battery module built therein, and having an air intake port through which air for cooling the battery module is introduced and an air exhaust port through which air that has cooled the battery module is discharged; an intake duct connected to the air intake port above the vehicle floor and extending into the interior to guide the air inside the interior into the case; and an exhaust duct connected to the air exhaust port and extending into the interior or exterior at a position spaced apart from the intake duct to guide the air that has cooled the battery module to be discharged to the outside of the case.

[0013] The vehicle floor is characterized by having multiple seats installed, an intake duct extending to draw in indoor air from below the front seat, and an exhaust duct extending to discharge air that has cooled the battery module from below or to the side of the rear seat.

[0014] The intake duct extends from below the front seat to draw in indoor air, and an inlet is formed for drawing in indoor air. As the intake duct extends from below the front seat upward above the indoor floor, the inlet is positioned so as to be spaced upward from the indoor floor.

[0015] The suction duct is provided with a cover portion installed above the inlet and formed to have an area capable of covering the inlet, so that air flows in between the inlet and the cover portion.

[0016] The intake duct is characterized by being positioned adjacent to the air conditioning duct that discharges air conditioning air to the front seat, thereby drawing in air conditioning air.

[0017] The exhaust duct is configured to extend downward from the rear seat to discharge air that has cooled the battery module and is connected to an air outlet, and to consist of a first exhaust passage that extends downward from the rear seat to discharge air into the room, and a second exhaust passage that branches off from the first exhaust passage and extends to the outside to discharge air to the outside, and is characterized by having a control valve provided at the branching point of the first exhaust passage and the second exhaust passage.

[0018] The exhaust duct is characterized by having an outlet formed for discharging air that has cooled the battery module, and the outlet is formed to face the rear from below or to the side of the rear seat.

[0019] A discharge path is formed in the vehicle floor that communicates to the outside from below or to the side of the rear seat, and as the exhaust duct extends to communicate with the discharge path, air that has cooled the battery module discharged through the exhaust port is discharged to the outside through the discharge path.

[0020] The exhaust duct is characterized by having a grille section having multiple holes formed by multiple ribs installed at the exhaust port and traversing the exhaust port vertically.

[0021] The vehicle floor is characterized by having a plurality of seats installed above and a case installed below, and an intake section that is vertically open and matches the air intake of the case, and an exhaust section that is vertically open and matches the air exhaust of the case.

[0022] A first watertight pad is provided above the vehicle floor and extends to surround the perimeter of the intake portion, and the intake duct is mounted such that the first watertight pad is interposed between the intake duct and the vehicle floor, thereby sealing the space between the intake duct and the vehicle floor by the first watertight pad.

[0023] A second watertight pad is provided above the vehicle floor to surround the perimeter of the discharge portion, and the discharge duct is mounted such that the second watertight pad is interposed between the discharge duct and the vehicle floor, thereby sealing the space between the discharge duct and the vehicle floor by the second watertight pad.

[0024] The case is provided with a third watertight pad extended to surround the perimeter of the air intake, so that when the case is mounted below the vehicle floor, the space between the air intake of the case and the vehicle floor is sealed by the third watertight pad.

[0025] The case is provided with a fourth watertight pad extended to surround the perimeter of the air outlet, so that when the case is mounted below the vehicle floor, the space between the air outlet of the case and the vehicle floor is sealed by the fourth watertight pad.

[0026] When an extension section extending along the vehicle floor is formed by extending an intake duct to draw in indoor air from below the front seat and an exhaust duct to discharge air that has cooled the battery module from below the rear seat, the extension section is characterized by having a cushioning pad configured to absorb shock and vibration.

[0027] The cushioning pad is characterized by being provided on the inner and outer sides of the extension, respectively, and formed to extend along the longitudinal direction. Effects of the invention

[0029] An electric vehicle battery storage device constructed with the structure described above has a case provided below the vehicle floor to secure interior space, and by cooling the battery module using interior air, the cooling structure is simplified and manufacturing costs are reduced. Brief explanation of the drawing

[0031] FIGS. 1 and 2 are drawings showing a battery storage device for an electric vehicle according to an embodiment of the present invention. FIGS. 3 to 11 are drawings for explaining a battery storage device for an electric vehicle shown in FIG. 1. Specific details for implementing the invention

[0032] Hereinafter, a battery storage device for an electric vehicle according to a preferred embodiment of the present invention will be examined with reference to the attached drawings.

[0034] FIGS. 1 to 2 are drawings showing a battery storage device for an electric vehicle according to an embodiment of the present invention, and FIGS. 3 to 11 are drawings for explaining the battery storage device for an electric vehicle shown in FIG. 1.

[0036] As shown in FIGS. 1 and 2, the battery storage device for an electric vehicle according to the present invention comprises: a case (20) which is coupled to the lower part of the vehicle floor (10) and has a battery module (21) built in it, and has an air intake port (22) into which air for cooling the battery module (21) is introduced and an air exhaust port (23) into which air that has cooled the battery module (21) is discharged; an intake duct (30) which is connected to the air intake port (22) above the vehicle floor (10) and extends into the interior to guide the air in the interior into the case (20); and an exhaust duct (40) which is connected to the air exhaust port (23) and extends into the interior or exterior at a position spaced apart from the intake duct (30) to guide the air that has cooled the battery module (21) to be discharged outside the case (20).

[0037] The case (20) may be configured to house a battery module (21) for power supply and to be separated vertically and assembled together. Inside the case (20), in addition to the battery module (21), various electrical components and a blower (C) for air circulation are provided. An air intake (22) through which air to cool the battery module (21) is introduced, and an air outlet (23) through which the air cooled by the battery module (21) is discharged are formed. Accordingly, when the blower (C) is operated, air introduced through the air intake (22) cools the battery module (21) and is discharged through the air outlet (23). Here, the blower (C) may be installed on the side of the air outlet (23), and the battery module (21) is cooled by air cooling by utilizing the air circulating inside the case (20).

[0038] Meanwhile, an intake duct (30) is connected to the air intake port (22) of the case (20) and extends into the room so that indoor air can be circulated into the case (20). Of course, the intake duct (30) can circulate outdoor air into the case (20), but since outdoor air has a high level of pollution and the outside temperature varies widely, the intake duct is formed to allow indoor air, which has a low level of pollution and maintains an appropriate temperature, to be circulated into the case (20).

[0039] An exhaust duct (40) is connected to the air outlet (23) of the case (20) and extends to the indoor or outdoor spaced apart from the intake duct (30) to guide the air that has cooled the battery module (21) to be discharged outside the case (20). Here, the exhaust duct (40) is formed to extend to the outdoors so that the air that has cooled the battery module (21) is discharged to the outdoors, or is formed to extend to the indoor space so that the air whose temperature has risen as it cools the battery module (21) can be used to control the indoor temperature.

[0040] In this way, the battery module (21) is cooled by air cooling as indoor air circulates through the case (20) via the intake duct (30) and exhaust duct (40) mounted on the case (20).

[0042] To explain the invention described above in detail, as shown in FIG. 1, a plurality of seats (S) are installed on the vehicle floor (10), and an intake duct (30) is extended to draw in air from the interior from below the front seat (S1) of the interior, and an exhaust duct (40) can be extended to discharge air that has cooled the battery module (21) from below or to the side of the rear seat (S2) of the interior.

[0043] Here, the plurality of seats may be divided into front seats (S1) and rear seats (S2), the front seats (S1) may correspond to the first row seats and the rear seats (S2) may correspond to the second row seats.

[0044] In particular, the intake duct (30) can draw in indoor air with low contamination by drawing in indoor air from below the front seat (S1), and interference with the occupant and structure is avoided.

[0045] The exhaust duct (40) discharges air that has cooled the battery module (21) from below or to the side of the rear seat (S2), thereby preventing the air discharged through the exhaust duct (40) from being delivered to the occupant and preventing interference with other structures. Additionally, the exhaust duct (40) is configured so that the air that has cooled the battery module (21) is discharged into the interior, thereby allowing the temperature of the interior to be controlled by the air whose temperature has risen as the battery module (21) is cooled.

[0046] In the case of such an exhaust duct (40), the indoor temperature can be controlled by configuring the air that has cooled the battery module (21) to be discharged indoors or outdoors. That is, as can be seen in FIG. 3, the exhaust duct (40) is configured to be connected to the air outlet (23) and extends downward or sideways of the rear seat (S2) to discharge air into the indoors, and a second exhaust duct (40b) branches off from the first exhaust duct (40a) and extends outwards to discharge air to the outdoors, and a control valve (40c) may be provided at the branching point of the first exhaust duct (40a) and the second exhaust duct (40b). In the case of the first exhaust duct (40a), it is configured to discharge air that has cooled the battery module (21) into the indoors, so it is preferable that it be formed to extend downwards of the rear seat (S2).

[0047] Here, the control valve (40c) can be configured to be controlled by a control unit so that the air cooling the battery module (21) is selectively moved to the first discharge path (40a) or the second discharge path (40b). The control unit can control the control valve (40c) by collecting information on the temperature of the air passing through the battery module (21) and the indoor temperature through various sensors. As a result, the air whose temperature has risen by cooling the battery module (21) is selectively supplied to the indoor or outdoor area according to the indoor temperature, thereby improving energy efficiency through the selective utilization of the air cooling the battery module (21).

[0049] Meanwhile, as illustrated in FIG. 4, the intake duct (30) has an inlet (31) formed for drawing in indoor air, and as it extends upward from the lower side of the front seat (S1) higher than the indoor floor, the inlet (31) can be positioned so as to be spaced upward from the indoor floor. The inlet (31) of the intake duct (30) may have a mesh structure and may be equipped with a filter for filtering foreign substances.

[0050] That is, the intake duct (30) may be composed of a rim portion (30a) that is coupled to the vehicle floor (10) and a duct portion (30b) that extends upward from the center of the rim portion (30a), and an inlet (31) is formed at the end of the duct portion (30b) so that the inlet (31) can be positioned so as to be spaced upward from the interior floor. Here, the rim portion (30a) of the intake duct (30) may be coupled to the vehicle floor (10) through bolting, and the duct portion (30b) may be formed to extend higher than the vehicle floor (10) where the front seat (S1) is installed.

[0051] In this way, the inlet (31) of the suction duct (30) is spaced apart from the indoor floor, thereby preventing foreign substances and moisture from the indoor floor from entering the inlet (31).

[0052] Additionally, the suction duct (30) may be provided with a cover portion (32) that is installed so as to be spaced upward from the inlet (31) and formed to have an area capable of covering the inlet (31). By positioning the cover portion (32) so as to be spaced from the inlet (31), the flow of air entering through the inlet (31) is not obstructed, and the entry of foreign substances can be blocked. In particular, since the inlet (31) of the suction duct (30) is formed to be open upward, air entry becomes difficult if an obstacle occurs on the upper side; however, as the cover portion (32) prevents the inlet (31) from being closed by the obstacle, smooth air entry through the suction duct (30) can be performed.

[0054] Meanwhile, as illustrated in FIG. 5, the intake duct (30) is positioned adjacent to the air conditioning duct (50) that discharges air conditioning air to the front seat (S1) so as to draw in air conditioning air. Here, the air conditioning duct (50) is configured to discharge heating or cooling air into the room and may be configured as a separate air conditioner to provide air from the front seat (S1) to the intake duct (30).

[0055] As a result, the intake duct (30) can draw in filtered clean air discharged through the air conditioning duct (50), and can improve the cooling efficiency of the battery module (21) by receiving cooling air discharged through the air conditioning duct (50) in conjunction with the air conditioner. In this way, since the intake duct (30) is positioned adjacent to the air conditioning duct (50), air that is temperature-controlled through the air conditioner is supplied to the intake duct (30), thereby allowing air optimized for temperature control of the battery module (21) to flow into the intake duct (30), thereby enabling efficient and diverse temperature control of the battery module (21).

[0057] Meanwhile, as shown in FIGS. 5 and 6, the exhaust duct (40) is formed with an outlet (41) through which air that has cooled the battery module (21) is discharged, and the outlet (41) may be formed to face the rear from below or to the side of the rear seat (S2).

[0058] That is, the exhaust duct (40) is formed such that one end is connected to the air outlet (23) of the case (20) and the other end extends downward or sideways toward the rear seat (S2), and the exhaust port (41) is formed at the other end so as to face the rear. In this way, by forming the exhaust port (41) of the exhaust duct (40) so as to face the rear, the air discharged through the exhaust port (41) is avoided from being delivered to the occupant seated on the rear seat (S2). Additionally, the air that has cooled the battery module (21) discharged through the exhaust port (41) can be naturally discharged to the outside from the rear of the interior. Here, if the exhaust duct (40) extends downward toward the rear seat (S2), space is secured on both sides of the rear seat (S2) to secure interior space, and if it extends to the side of the rear seat (S2), space is secured downward toward the rear seat (S2), which is advantageous for securing foot insertion space for the occupant of the third row seat and for seat design.

[0059] Additionally, the exhaust duct (40) may be provided with a grille (42) having multiple holes formed by multiple ribs that are installed at the exhaust port (41) and cross the exhaust port (41) vertically. As such, the grille (42) forms a mesh structure by having multiple holes formed by multiple ribs, thereby blocking foreign substances entering the exhaust port (41) without obstructing the flow of air discharged through the exhaust port (41). As a result, the air circulating through the exhaust duct (40) is smoothly discharged through the exhaust port (41), thereby stably maintaining the cooling of the battery module (21).

[0061] Meanwhile, as can be seen in FIG. 1, a discharge path (13) is formed in the vehicle floor (10) and is connected to the outside from below or to the side of the rear seat (S2). As the discharge duct (40) is extended to be connected to the discharge path (13), air that has cooled the battery module (21) discharged through the discharge port (41) can be discharged to the outside through the discharge path (13).

[0062] Here, the discharge path (13) of the vehicle floor (10) is provided below or to the side of the rear seat (S2) and extends to the outside. An exhaust duct (40) extended to communicate with this discharge path (13) has an exhaust port (41) connected to the discharge path (13), thereby allowing air that has cooled the battery module (21) to be discharged to the outside through the discharge path (13). In this way, the air whose temperature has risen as it cools the battery module (21) is discharged to the outside through the discharge path (13), so that it does not affect the indoor temperature and the indoor temperature can be maintained.

[0064] Meanwhile, as illustrated in FIGS. 1 and 8, a plurality of seats are installed on the upper side of the vehicle floor (10) and a case (20) is installed on the lower side, and an intake section (11) that is connected vertically and matches the air intake port (22) of the case (20) and an exhaust section (12) that is connected vertically and matches the air exhaust port (23) of the case (20) may be formed.

[0065] That is, an interior space in which a plurality of seats (S) are installed is provided above the vehicle floor (10), and an exterior space is provided below the vehicle floor (10), and as the case (20) is installed on the vehicle floor (10), the interior space is easily secured and maintenance is improved.

[0066] In this vehicle floor (10), an intake section (11) that matches the air intake port (22) of the case (20) and an exhaust section (12) that matches the air exhaust port (23) of the case (20) are formed, so that an intake duct (30) and an exhaust duct (40) provided above the vehicle floor (10) are connected to the intake section (11) and the exhaust section (12), respectively, so that air can be circulated to the case (20). That is, in the present invention, the cooling of the battery module (21) is performed by an air-cooling method using indoor air in the case (20), and the intake duct (30) and the exhaust duct (40) installed above the vehicle floor (10) enable indoor air to be circulated to the case (20) installed below the vehicle floor (10) through the intake section (11) and the exhaust section (12) of the vehicle floor (10). As a result, the case (20) can be discharged after the indoor air introduced through the intake duct (30) cools the battery module (21) and then cools the battery module (21) again through the exhaust duct (40).

[0068] Meanwhile, as illustrated in FIG. 9, a first watertight pad (14) is provided above the vehicle floor (10) and extends to surround the perimeter of the intake section (11), and the intake duct (30) is mounted such that the first watertight pad (14) is interposed with the intake section (11) of the vehicle floor (10), thereby sealing the space between the intake duct (30) and the vehicle floor (10) by the first watertight pad (14). Additionally, a second watertight pad (15) is provided above the vehicle floor (10) and extends to surround the perimeter of the discharge section (12), and the discharge duct (40) is mounted such that the second watertight pad (15) is interposed with the discharge section (12) of the vehicle floor (10), thereby sealing the space between the discharge duct (40) and the vehicle floor (10) by the second watertight pad (15).

[0069] Here, the first watertight pad (14) and the second watertight pad (15) may be made of an elastically deformable rubber material, and the suction part (11) and the discharge part (12) are each sealed through the first watertight pad (14) and the second watertight pad (15).

[0070] That is, the intake duct (30) is installed such that a first watertight pad (14) is interposed in the intake section (11) of the vehicle floor (10), and the first watertight pad (14) is in close contact between the intake duct (30) and the intake section (11), thereby preventing foreign matter and moisture from entering the intake section (11) from above the vehicle floor (10). In addition, the exhaust duct (40) is installed such that a second watertight pad (15) is interposed in the exhaust section (12) of the vehicle floor, and the second watertight pad (15) is in close contact between the exhaust duct (40) and the exhaust section (12), thereby preventing foreign matter and moisture from entering the exhaust section (12) from above the vehicle floor (10).

[0071] In this way, the intake duct (30) and exhaust duct (40) mounted above the vehicle floor (10) are installed so as to be sealed through the first watertight pad (14) and the second watertight pad (15), thereby preventing foreign substances and moisture from entering through the intake part (11) and exhaust part (12) of the vehicle floor (10), and thus preventing contamination of the battery module (21).

[0073] Meanwhile, as illustrated in FIG. 10, the case (20) is provided with a third watertight pad (16) that extends to surround the perimeter of the air intake (22), so that when the case (20) is mounted below the vehicle floor (10), the space between the air intake (22) of the case (20) and the vehicle floor (10) can be sealed by the third watertight pad (16).

[0074] Additionally, the case (20) is provided with a fourth watertight pad (17) that extends to surround the perimeter of the air outlet (23), so that when the case (20) is mounted below the vehicle floor (10), the space between the air outlet (23) of the case (20) and the vehicle floor (10) can be sealed by the fourth watertight pad (17).

[0075] Here, the third watertight pad (16) and the fourth watertight pad (17) may be made of an elastically deformable rubber material, and the air intake (22) and the air exhaust (23) of the case (20) are sealed, respectively, through the third watertight pad (16) and the fourth watertight pad (17).

[0076] Since the case (20) is mounted on the lower part of the vehicle floor (10), foreign matter and moisture generated during driving must be prevented from entering the air intake (22) or air exhaust (23) of the case (20).

[0077] To this end, the case (20) is mounted such that when the air intake port (22) is mounted on the intake section (11) of the vehicle floor (10), a third watertight pad (16) is interposed therein, thereby sealing the space between the air intake port (22) of the case (20) and the intake section (11) of the vehicle floor (10), so that foreign matter and moisture are prevented from entering. Additionally, when the air exhaust port (23) of the case (20) is mounted such that when it is mounted on the exhaust section (12) of the vehicle floor (10), a fourth watertight pad (17) is interposed therein, thereby sealing the space between the air exhaust port (23) of the case (20) and the exhaust section (12) of the vehicle floor (10), so that foreign matter and moisture are prevented from entering.

[0078] In this way, the case (20) mounted on the lower part of the vehicle floor (10) is mounted in a sealed manner through the third watertight pad (16) and the fourth watertight pad (17), thereby preventing foreign matter and moisture from entering through the air intake (22) and air exhaust (23) of the case (20), and thus preventing contamination of the battery module (21).

[0080] Meanwhile, when an extension (60) extending along the vehicle floor (10) is formed by extending the intake duct (30) to draw in indoor air from below the front seat (S1) and the exhaust duct (40) to discharge air that has cooled the battery module (21) from below the rear seat (S2), a cushioning pad (70) configured to absorb shock and vibration may be provided in the extension (60).

[0081] In the present invention, the intake duct (30) is formed to extend downwards toward the front seat (S1), and the exhaust duct (40) is formed to extend downwards toward the rear seat (S2). In the present invention, as the case (20) is positioned on the front side of the vehicle floor (10), the exhaust duct (40) is formed to extend downwards toward the rear seat (S2). Accordingly, as can be seen in FIG. 6, the exhaust duct (40) has an extension (60) that extends along the vehicle floor (10), forming a path through which air that has cooled the battery module (21) in the case (20) flows. However, as the extension (60) of the exhaust duct (40) extends along the vehicle floor (10), vibration and noise may occur as the air that has cooled the battery module (21) is discharged. Accordingly, the extension part (60) is provided with a cushioning pad (70) made of an elastic material to absorb noise and vibration, thereby preventing the transmission of a strange sensation caused by noise and vibration to the occupant.

[0082] As shown in FIG. 11, such cushioning pads (70) can be formed to extend along the longitudinal direction by being provided on the inner and outer sides of the extension (60), respectively. As a result, noise and vibration caused by the airflow passing through the inner side of the extension (60) are absorbed by the cushioning pads (70), and impacts applied to the outer side of the extension (60) are also absorbed by the cushioning pads (70), thereby ensuring the durability of the extension (60).

[0084] An electric vehicle battery storage device having the structure described above has a battery case (20) provided below the vehicle floor (10) to secure an interior space, and by using the interior air to cool the battery module (21), the cooling structure is simplified and manufacturing costs are reduced.

[0086] Although the present invention has been illustrated and described in relation to specific embodiments, it will be obvious to those skilled in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims. Explanation of the symbols

[0088] 10: Vehicle floor 11: Intake 12: Discharge section 13: Discharge path 14: 1st watertight pad 15: 2nd watertight pad 16: 3rd Watertight Pad 17: 4th Watertight Pad 20: Case 21: Battery Module 22: Air intake 23: Air exhaust 30: Suction duct 31: Inlet 32: Cover section 40: Exhaust duct 40a: 1st discharge channel 40b: 2nd discharge channel 40c: Control valve 41: Discharge port 42: Grille section 50: HVAC duct 60: Extension part 70: Cushioning pad

Claims

Claim 1 A case coupled to the lower part of the vehicle floor and having a battery module built into it, an air intake for introducing air to cool the battery module, and an air outlet for discharging air that has cooled the battery module; an intake duct connected to the air intake above the vehicle floor and positioned adjacent to an air conditioning duct that discharges air conditioning air to the front seat from below the front seat, thereby drawing in air conditioning air and guiding the drawn-in air into the case; A battery storage device for an electric vehicle, comprising: a discharge duct that is connected to an air outlet and extends to an indoor or outdoor spaced apart from an intake duct, and is formed to face the rear from below or to the side of the rear seat, and includes a discharge port through which air that has cooled the battery module is discharged; wherein a discharge path is formed in the vehicle floor that is connected to the outside from below or to the side of the rear seat, and as the discharge duct extends to be connected to the discharge path, the air that has cooled the battery module discharged through the discharge port is discharged to the outside through the discharge path. Claim 2 A battery storage device for an electric vehicle according to claim 1, characterized in that a plurality of seats are installed on the vehicle floor, an intake duct extends to draw in indoor air from below the front seat, and an exhaust duct extends to discharge air that has cooled the battery module from below or to the side of the rear seat. Claim 3 A battery storage device for an electric vehicle according to claim 1, wherein the intake duct extends to draw in indoor air from below the front seat, and an inlet is formed for drawing in indoor air, and as the intake duct extends higher than the indoor floor from below the front seat, the inlet is positioned so as to be spaced upward from the indoor floor. Claim 4 A battery storage device for an electric vehicle according to claim 3, characterized in that the suction duct is provided with a cover portion installed above the inlet and formed to have an area capable of covering the inlet, so that air flows between the inlet and the cover portion. Claim 5 delete Claim 6 A battery storage device for an electric vehicle according to claim 1, wherein the exhaust duct is extended downward of the rear seat to discharge air that has cooled the battery module and is connected to communicate with an air outlet, and is composed of a first exhaust passage that extends downward of the rear seat to discharge air into the room, and a second exhaust passage that branches off from the first exhaust passage and extends to the outside to discharge air to the outside, and a control valve is provided at the branching point of the first exhaust passage and the second exhaust passage. Claim 7 delete Claim 8 delete Claim 9 A battery storage device for an electric vehicle according to claim 1, characterized in that the discharge duct is provided with a grille portion having a plurality of holes formed by a plurality of ribs installed at the discharge port and crossing the discharge port vertically. Claim 10 A battery storage device for an electric vehicle according to claim 1, characterized in that a plurality of seats are installed on the upper side of the vehicle floor and a case is installed on the lower side, and an intake section that is vertically open and matches the air intake port of the case and an exhaust section that is vertically open and matches the air exhaust port of the case are formed. Claim 11 A battery storage device for an electric vehicle according to claim 10, wherein a first watertight pad is provided above the vehicle floor and extends to surround the perimeter of the intake portion, and the intake duct is mounted such that the first watertight pad is interposed between the intake duct and the vehicle floor, thereby sealing the space between the intake duct and the vehicle floor by the first watertight pad. Claim 12 A battery storage device for an electric vehicle according to claim 10, wherein a second watertight pad is provided above the vehicle floor and extends to surround the perimeter of the discharge portion, and the discharge duct is mounted such that the second watertight pad is interposed between the discharge duct and the vehicle floor, thereby sealing the space between the discharge duct and the vehicle floor by the second watertight pad. Claim 13 A battery storage device for an electric vehicle according to claim 10, characterized in that the case is provided with a third watertight pad extended to surround the perimeter of the air intake, so that when the case is mounted below the vehicle floor, the space between the air intake of the case and the vehicle floor is sealed by the third watertight pad. Claim 14 A battery storage device for an electric vehicle according to claim 10, characterized in that the case is provided with a fourth watertight pad extended to surround the perimeter of an air outlet, so that when the case is mounted below the vehicle floor, the space between the air outlet of the case and the vehicle floor is sealed by the fourth watertight pad. Claim 15 A battery storage device for an electric vehicle according to claim 10, wherein an extension portion extending along the vehicle floor is formed by extending the intake duct to draw in indoor air from below the front seat and the exhaust duct to discharge air that has cooled the battery module from below the rear seat, and the extension portion is provided with a cushioning pad configured to absorb shock and vibration. Claim 16 A battery storage device for an electric vehicle according to claim 15, characterized in that the cushioning pads are respectively provided on the inner and outer sides of the extension and formed to extend along the longitudinal direction.

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