Battery storage devices for electric vehicles

Abstract

The present disclosure relates to a battery storage device for an electric vehicle, the battery housing of which is disposed on a vehicle floor, thereby securing an interior space. A battery module of the battery storage device can be cooled by using air in a vehicle compartment, thereby simplifying a cooling structure and saving manufacturing costs. In addition, the battery storage device for an electric vehicle prevents noise generated by a cooling device and electrical components from flowing into the vehicle compartment, thereby preventing passengers from feeling uncomfortable due to the noise.

Description

Technical Field

[0001] The present disclosure relates to a battery storage device for an electric vehicle in which a battery pack is embedded and provided with a cooling device configured to cool the battery pack. Background Art

[0002] Recently, due to reasons such as environmental issues and high oil prices, interest in environmentally friendly vehicles has been growing, and electric vehicles (EVs) for allowing vehicles to travel by using electric energy have been variously developed.

[0003] Such electric vehicles include a battery-powered EV, a fuel cell EV using a fuel cell as a motor, a hybrid EV using a motor and an engine together, and the like.

[0004] Specifically, an electric vehicle is provided with a battery module configured to store electric energy, and the battery module accommodates a plurality of battery cells in a battery housing. Since such a battery housing is large and heavy, it is important to ensure a mounting space in the vehicle body so as to mount the battery housing to the vehicle body. In addition, since high temperature heat is generated when the battery module is driven, it is necessary to cool the battery module, but an optimal design of a battery housing considering the vehicle body mounting space and battery module cooling has not yet been achieved.

[0005] The above explained as the background art is only intended to help understanding the background art of the present disclosure, and is not intended to mean that the present disclosure falls within the scope of the relevant art known to those skilled in the art. Summary of the invention

[0006] The present disclosure aims to solve the above-mentioned problems, and an object of the present disclosure is to provide a battery storage device for an electric vehicle, which prepares a battery housing on the vehicle floor, thereby ensuring the space in the vehicle cabin, and cools the battery pack by using the air in the vehicle cabin, thereby simplifying the cooling structure and saving manufacturing costs.

[0007] A battery storage device for an electric vehicle according to the present disclosure for achieving this purpose includes a battery housing and a battery cover, wherein a battery pack is accommodated in an internal space of the battery housing, the battery housing includes an air intake port and an exhaust port, air in a vehicle compartment is sucked in through the air intake port, and air from the battery pack is discharged to the exhaust port, and the battery housing also includes a cooling device connected to the exhaust port to circulate air in the vehicle compartment into the internal space; the battery cover covers the battery housing and has an inflow hole that matches the air intake port when installed on the battery housing, and the battery cover is provided with a first noise reduction component, which is arranged between the cooling device and the inflow hole to prevent driving sound generated when the cooling device is driven from flowing into the vehicle compartment through the inflow hole.

[0008] Since the battery housing is disposed below the rear seat of the vehicle and extends in the lateral direction of the vehicle, the interior space including the battery pack extends in the lateral direction of the vehicle.

[0009] An exhaust port connected to the cooling device is provided at one side of the lower side of the battery case, and an intake port is provided on the other side of the upper side of the battery case to be spaced apart from the exhaust port.

[0010] The internal space of the battery case has a lower flow path and an upper flow path, the lower flow path is connected to the exhaust port below the battery pack, the upper flow path is connected to the intake port above the battery pack to surround the battery pack, and the upper flow path is formed to face the intake port and tilt upward from one side to the other side.

[0011] A void space is provided between an upper end of the battery case and the battery cover, and a first noise reduction member is inserted in the void space between the upper end of the battery case and the battery cover.

[0012] The first noise reduction member is bent to cover a front end of the battery housing facing the front of the vehicle at an upper end of the battery housing.

[0013] The air intake port includes a plurality of portions having areas that are different from one another and that increase in a direction away from the air outlet port where the cooling device is provided.

[0014] The battery housing is provided with a suction pipe connected to communicate with the air intake port and extending into the vehicle compartment to guide the air in the vehicle compartment to the interior space.

[0015] The suction duct is provided at the center of the vehicle in the lateral direction on a vehicle floor where the battery housing is provided, and introduces air in the vehicle cabin through a suction port which faces the front of the vehicle.

[0016] The suction port includes a grille portion having a plurality of holes formed by a plurality of ribs intersecting vertically and laterally.

[0017] The battery housing also includes electrical components, which are arranged to be separated from the internal space that accommodates the battery pack, and the battery cover covers the battery housing including the internal space and the electrical components, and the battery cover includes a second noise reduction member for the electrical components to cover the electrical components to prevent noise generated by the electrical components from flowing into the vehicle compartment.

[0018] The second noise reduction member for the electric component is bent to cover a front end of the battery housing facing the front of the vehicle at an upper end of the electric component.

[0019] The battery storage device for electric vehicles having the above structure has a housing prepared on the vehicle floor, thereby ensuring a space in the vehicle cabin, and uses the air in the vehicle cabin to cool the battery module, thereby simplifying the cooling structure and saving manufacturing costs. In addition, the noise generated by the cooling device and the electrical components is prevented from flowing into the vehicle cabin, thereby preventing the passengers from feeling uncomfortable due to the generated noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and other advantages of the present disclosure will be more clearly understood through the following detailed description when combined with the accompanying drawings, in which:

[0021] Figure 1 is a view showing a battery storage device for an electric vehicle according to the present disclosure.

[0022] Figures 2 to 9 It is used to explain Figure 1 A view of a battery storage device for an electric vehicle is shown. DETAILED DESCRIPTION

[0023] Hereinafter, a battery storage device for an electric vehicle according to a preferred embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0024] Figure 1 is a view showing a battery storage device for an electric vehicle according to the present disclosure, and Figures 2 to 9 It is used to explain Figure 1 A view of a battery storage device for an electric vehicle is shown.

[0025] like Figures 1 to 3 As shown, a battery storage device for an electric vehicle according to the present disclosure includes a battery housing 100 and a battery cover 200, wherein the battery housing is constructed to be mounted to a vehicle floor (F), accommodating a battery pack 120 in an internal space 110 provided by the battery housing 100, the battery housing being formed with an air intake port 130 and an air exhaust port 140, the air in the vehicle compartment is sucked in through the air intake port, the air that has cooled the battery pack 120 is discharged to the air exhaust port, and the battery housing is provided with a cooling device 150 connected to the air exhaust port 140 to allow the air in the vehicle compartment to circulate to the internal space 110; the battery cover is formed to cover the battery housing 100, and has an inflow hole 210 that matches the air intake port 130 when mounted on the battery housing 100, and the battery cover is provided with a first noise reduction component 220, the first noise reduction component being arranged between the cooling device 150 and the inflow hole 210 to prevent the driving sound generated when the cooling device 150 is driven from flowing into the vehicle compartment through the inflow hole 210.

[0026] As described above, the battery pack 120 is embedded in the battery case 100, and the air intake port 130 and the air exhaust port 140 for circulating cooling air to the battery pack 120 are formed in the battery case. Herein, the air intake port 130 communicates with the air in the vehicle cabin, and the air exhaust port 140 is connected to the cooling device 150, so that when the cooling device 150 is driven, the air in the cabin is introduced through the air intake port 130, and the air that has cooled the battery pack 120 is discharged through the air exhaust port 140, thereby cooling the battery pack 120. As described above, in the present disclosure, when the cooling device 150 is driven, the air in the cabin can be communicated to the internal space 110 of the battery case 100, thereby cooling the battery pack 120 in an air cooling manner.

[0027] Such a battery housing 100 is covered and protected by a battery cover 200, and the battery cover 200 is formed with an inflow hole 210, which matches the air intake port 130 when the battery cover is mounted to the battery housing 100. The battery cover 200 may be made of a steel material to be able to protect the battery housing 100. Specifically, the battery cover 200 is provided with a first noise reduction member 220, which is provided between the cooling device 150 and the inflow hole 210 to prevent the driving sound generated when the cooling device 150 is driven from flowing into the vehicle compartment through the inflow hole 210. The first noise reduction member 220 may be made of a rubber material that is a noise absorbing material.

[0028] As described above, when the battery cover 200 is installed to the battery housing 100, the first noise reduction member 220 prevents the driving sound of the cooling device 150 from flowing into the vehicle compartment through the inlet hole 210 and the air intake port 130 located between the cooling device 150 and the inlet hole 210, thereby eliminating the dissatisfaction that may be caused to the passengers due to the noise generated by the driving cooling device 150 and the noise generated by the components including the battery pack 120 flowing into the vehicle compartment.

[0029] Specifically describing the above disclosure, since the battery housing 100 according to the present disclosure is arranged under the rear seat and is arranged to extend in the lateral direction of the vehicle (for example, from the left side of the vehicle to the right side of the vehicle, or vice versa), the internal space 110 including the battery pack 120 can extend in the lateral direction of the vehicle.

[0030] As described above, since the battery housing 100 is disposed on the upper side of the vehicle floor (F) below the rear seat, no separate waterproof component is required. In addition, since the battery housing 100 is disposed to extend in the lateral direction of the vehicle, the weight of the battery housing 100 is distributed in the lateral direction of the vehicle.

[0031] At the same time, if Figure 3As shown, one side of the bottom of the battery case 100 may be formed with an exhaust port 140 connected to the cooling device 150 , and the other side of the top of the battery case 100 may be formed with an intake port 130 spaced apart from the exhaust port 140 .

[0032] Therefore, the battery pack 120 can be cooled because the internal space 110 of the battery housing 100 forms an air circulation path, which allows the air in the vehicle compartment to be introduced from the top through the air intake hole 130 and communicate with the exhaust port 140 at the bottom through the battery pack 120.

[0033] That is, since the battery case 100 is mounted on the floor (F) and the battery pack 120 is cooled by using the air in the cabin, the air intake port 130 may be formed at the top of the interior space 110, thereby shortening the inflow path of the air in the cabin. In addition, the air exhaust port 140 may be formed at the bottom of the interior space 110 so that the air flow path formed is such that the air in the cabin introduced from the top of the interior space 110 flows through the battery pack 120.

[0034] In addition, if Figure 3 As shown, the exhaust port 140 is formed at one side of the bottom of the battery housing 100, and the intake port 130 is formed at the other side of the top of the battery housing, so that the air flowing into the internal space 110 through the intake port 130 is discharged through the exhaust port 140 after circulating through the entire battery pack 120.

[0035] At the same time, the internal space 110 of the battery housing 100 has a lower flow path 111 and an upper flow path 112, the lower flow path is connected to the exhaust port 140 below the battery pack 120, and the upper flow path is connected to the intake port above the battery pack 120 to surround the battery pack 120, and the upper flow path 112 can be formed to tilt upward from one side to the other side toward the intake port 130.

[0036] As described above, the internal space 110 has a lower flow path 111 and an upper flow path 112 below and above the battery pack 120, respectively, so that the air flowing into the internal space 110 through the intake port 130 moves along the upper flow path 112 to form a path through which air can circulate throughout the battery pack 120, and the air moving to the lower flow path 111 through the battery pack 120 can be discharged to the outside through the exhaust port 140.

[0037] Specifically, the upper flow path 112 is formed to be inclined upward from one side to the other side toward the air intake port 130. That is, in the present disclosure, since the exhaust port 140 is formed at one side of the bottom of the internal space 110 and the air intake port 130 is formed at the other side of the top of the internal space 110, the closer to the exhaust port 140 side connected to the cooling device 150, the greater the amount of connected air. Therefore, the upper flow path 112 is formed to be inclined upward from the side where the exhaust port 140 is located to the other side, so that as the amount of connected air increases at the other side of the battery pack 120 and the amount of connected air decreases at one side of the battery pack 120, the air introduced through the air intake port 130 located at the other side can pass through the battery pack 120 as a whole to be discharged through the exhaust port 140 located at one side.

[0038] At the same time, since the upper flow path 112 of the internal space 110 of the battery housing 100 is formed to tilt upward from one side to the other side toward the air intake port 130, a gap space (T) can be formed between the upper end of the battery housing 100 and the battery cover 200 so that the driving sound of the cooling device 150 arranged at one side of the battery housing 100 flows into the corresponding gap space.

[0039] That is, the driving sound generated by driving the cooling device 150 may flow into the internal space 110 through the exhaust port 140, but may be blocked from flowing into the vehicle compartment by the battery pack 120, but since the upper flow path 112 is formed to be inclined upward to improve the cooling efficiency of the battery housing 100, when the battery cover 200 is coupled to the upper end of the battery housing 100, a gap space is formed between the upper end of the battery housing 100 and the battery cover 200. Since such a gap space serves as a passage through which the driving sound of the cooling device 150 may flow into the vehicle compartment through the air intake port 130, the first noise reduction member 220 may be inserted in the gap space between the upper end of the battery housing 100 and the battery cover 200, thereby blocking the driving sound of the cooling device 150 from flowing into the vehicle compartment.

[0040] Therefore, the battery housing 100 ensures the cooling efficiency of the battery pack 120, and blocks the driving sound generated by the cooling device 150 and the noise generated by components including the battery pack 120 from flowing into the vehicle cabin through the first noise reduction member 220, thereby eliminating the dissatisfaction caused by the generation of noise in the vehicle cabin.

[0041] Such a first noise reduction member 220 may be formed to be bent to cover a front end of the battery case 100 facing the front of the vehicle at an upper end of the battery case 100 .

[0042] like Figure 4As shown, the first noise reduction member 220 is formed to bend from the upper end of the battery housing 100 to the front end so that the driving sound generated by the cooling device 150 does not flow into the vehicle compartment. That is, since the battery housing 100 of the present disclosure is arranged in the lateral direction of the vehicle and is arranged below the rear seat, when the driving sound generated by the cooling device 150 is transmitted to the front of the vehicle, the passengers in the vehicle compartment easily recognize the driving sound of the cooling device 150. Therefore, the first noise reduction member 220 is formed to be bent to cover the front end together with the upper end of the battery housing 100, thereby effectively preventing the driving sound of the cooling device 150 from flowing into the vehicle compartment. Of course, the first noise reduction member 220 may be formed to completely surround the battery housing 100; as an alternative, if the first noise reduction member 220 extends to an unnecessary section, the manufacturing cost increases, therefore, the first noise reduction member 220 is formed to cover the upper end and the front end of the battery housing 100, thereby effectively preventing the driving sound of the cooling device 150.

[0043] At the same time, if Figures 5 to 7 As shown, the air intake port 130 may be formed as a plurality of air intake ports, which are formed to have different areas from each other and are formed to have larger areas in a direction away from the exhaust port 140 where the cooling device 150 is provided.

[0044] Herein, a plurality of intake ports 130 may be formed to be spaced apart from each other in the longitudinal direction of the battery case 100 , and two intake ports 130 are illustrated in the drawings.

[0045] Specifically, the plurality of air intake ports 130 have different areas from each other, and are formed to have gradually larger areas in a direction away from the exhaust port 140. That is, since the cooling device 150 is connected to the exhaust port 140, the amount of air communicated by the plurality of air intake ports 130 increases as they are closer to the exhaust port 140. Therefore, the plurality of air intake ports 130 are formed to have larger areas in a direction away from the exhaust port 140 to which the cooling device 150 is connected, so that the amount of air communicated decreases at the air intake ports 130 adjacent to the exhaust port 140, and the amount of air communicated increases in a direction away from the exhaust port 140, and the air introduced through the plurality of air intake ports 130 can effectively pass through the battery pack 120, thereby ensuring cooling efficiency.

[0046] At the same time, if Figure 5 and Figure 7 As shown, the battery housing 100 may be provided with a suction duct 160 that is connected to communicate with the suction port 130 and extends into the vehicle cabin to guide the air in the vehicle cabin to the internal space 110 .

[0047] Such an intake duct 160 is connected to communicate with the air intake port 130 and extends into the vehicle cabin so that the air in the vehicle cabin flows into the interior space 110. Of course, the intake duct 160 can allow the air outside the vehicle cabin to flow into the interior space 110 of the battery housing 100, but it is preferable to communicate the air in the vehicle cabin that is less polluted and can maintain a temperature at an appropriate level to the interior space 110.

[0048] The suction pipe 160 may be coupled to the battery case 100 through a waterproof pad (P) to prevent foreign matter and moisture from flowing into a location where the suction pipe 160 and the battery case 100 are coupled.

[0049] Herein, the suction duct 160 may be disposed at the center of the vehicle in a lateral direction on a vehicle floor (F), and a suction port 161 through which cabin air is introduced may be formed to face the front of the vehicle.

[0050] In the present disclosure, since the battery housing 100 is installed under the rear seat, the suction port 161 of the suction duct 160 is preferably formed to face the front of the vehicle so as to smoothly suck in the air in the vehicle cabin. In addition, the suction duct 160 is arranged at the center of the vehicle in the lateral direction on the vehicle floor (F), thereby avoiding the obstruction of air inflow caused by the passenger sitting in the rear seat, and the suction duct 160 is positioned to avoid the structure configured to mount the rear seat to the floor (F), thereby not interfering with the seat design.

[0051] Meanwhile, the suction port 161 may be provided with a grill portion 162 having a plurality of holes formed by a plurality of ribs crossing vertically and transversely.

[0052] As described above, the grille portion 162 may be formed of a mesh structure having a plurality of holes formed by a plurality of ribs, thereby not obstructing the flow of air introduced through the suction port 161 and preventing foreign matter from flowing into the suction port 161. Therefore, air to be introduced through the suction duct 160 may be smoothly introduced through the suction port 161, thereby stably maintaining the cooling of the battery pack 120.

[0053] At the same time, if Figure 2 and Figure 8 As shown, the battery housing 100 is also provided with an electrical component 170, and the electrical component 170 is arranged to be separated from the internal space 110 accommodating the battery pack 120, and the battery cover 200 can be formed to cover the battery housing 100 including the internal space 110 and the electrical component 170, and a second noise reduction member 230 for the electrical component 170 can be provided, and the second noise reduction member is formed to surround the electrical component to prevent the noise generated by the electrical component 170 from flowing into the vehicle compartment.

[0054] Herein, the electrical component 170 may be various electrical components including a high voltage relay, and is prepared at the other side of the battery case 100 opposite to the cooling device 150. Such an electrical component 170 is provided to be separated from the internal space 110 accommodating the battery pack 120, thereby minimizing the influence of heat generated by the battery pack 120.

[0055] Specifically, in the case of the electrical component 170, noise is generated when the high voltage relay is driven. Therefore, the battery cover 200 is formed to cover the battery housing 100 including the internal space 110 and the electrical component 170, and is provided with a second noise reduction member 230 for electrical components, which is formed to surround the electrical component 170 to prevent the noise generated by the electrical component 170 from flowing into the vehicle compartment. Such a second noise reduction member 230 for electrical components may be made of a rubber material that is a material capable of absorbing sound.

[0056] As described above, when the battery cover 200 is mounted to the battery housing 100, the second noise reduction member 230 for electrical components covers the electrical components 170 to prevent the noise generated by the electrical components 170 from flowing into the vehicle compartment, thereby preventing the noise generated by the electrical components 170 from flowing into the vehicle compartment and causing discomfort to the passengers.

[0057] Such a second noise reduction member 230 for electric components may be formed to be bent to cover the front end of the battery case 100 facing the front of the vehicle from the upper end of the electric component 170 .

[0058] like Figure 4 As shown, the second noise reduction member 230 for electrical components is formed to bend from the upper end of the battery housing 100 to the front end, thereby preventing the noise generated by the electrical component 170 from flowing into the vehicle compartment. That is, since the battery housing 100 according to the present disclosure is arranged in the lateral direction of the vehicle and is arranged below the rear seat, when the driving sound generated by the electrical component 170 is transmitted to the front of the vehicle, the passengers in the vehicle compartment can easily recognize the driving sound of the electrical component 170. Therefore, the second noise reduction member 230 for electrical components is formed to be curved to cover the front end together with the upper end of the battery housing 100, thereby effectively preventing the noise of the electrical installation 170 from flowing into the vehicle compartment. Thus, the second noise reduction member 230 for electrical components can effectively prevent the noise generated by the electrical component 170 from flowing into the vehicle compartment, and prevent the increase in manufacturing costs caused by preparing the second noise reduction member 230 for electrical components in unnecessary sections.

[0059] like Fig. 9As shown, in the battery storage device for electric vehicles according to the present disclosure, when the door wear member (F-1) and the floor mat (F-2) are mounted to the vehicle body floor (F), only the suction port 161 of the suction pipe 160 is exposed in the vehicle compartment, and the battery case 100 is prepared under the seat on the top of the floor (F), so that the battery case 100 does not have to be a waterproof structure. In addition, by preparing the first noise reduction member 220 and the second noise reduction member 230 for the electrical components on the battery case 200, the sounds generated by the cooling device 150 and the electrical components 170 are blocked, respectively, thereby preventing the passengers in the vehicle compartment from feeling uncomfortable due to the generated noise.

[0060] While specific embodiments of the present disclosure have been shown and described, it will be apparent to those skilled in the art that various improvements and changes may be made to the present disclosure without departing from the technical spirit of the present disclosure provided by the appended claims.

Claims

1. A battery storage device for an electric vehicle, comprising: a battery case that accommodates a battery pack in an internal space of the battery case, wherein the battery case includes an air intake port and an air exhaust port, air in a vehicle compartment is sucked in through the air intake port, air that has cooled the battery pack is discharged to the air exhaust port, and the battery case includes a cooling device connected to the air exhaust port so that the air in the vehicle compartment circulates to the internal space; and a battery cover covering the battery housing, the battery cover having an inflow hole matching the air intake port when mounted to the battery housing, and the battery cover being provided with a first noise reduction member, the first noise reduction member being provided between the cooling device and the inflow hole to prevent a driving sound generated when the cooling device is driven and a noise caused by driving the battery pack from flowing into the vehicle compartment through the inflow hole, wherein the first noise reduction member is bent to cover a front end of the battery housing facing the front of the vehicle at an upper end of the battery housing.

2. The battery storage device for an electric vehicle according to claim 1, in, The battery housing is disposed under a rear seat of a vehicle and extends in a lateral direction of the vehicle, and the interior space including the battery pack extends in the lateral direction of the vehicle.

3. The battery storage device for an electric vehicle according to claim 1, in, The exhaust port connected to the cooling device is provided at one side of the bottom of the battery case, and the intake port is provided at the other side of the top of the battery case to space the intake port from the exhaust port.

4. The battery storage device for an electric vehicle according to claim 3, in, The internal space of the battery case has a lower flow path and an upper flow path, the lower flow path is connected to the exhaust port below the battery pack, the upper flow path is connected to the intake port above the battery pack to surround the battery pack, and the upper flow path is inclined upward from one side to the other side facing the intake port.

5. The battery storage device for an electric vehicle according to claim 1, in, The air intake port includes a plurality of portions having areas that are different from one another and increase in a direction away from the air exhaust port where the cooling device is provided.

6. The battery storage device for an electric vehicle according to claim 1, in, The battery housing is mounted to a vehicle floor and is provided with a suction duct connected to communicate with the air intake port and extending into a vehicle cabin to guide cabin air to the interior space.

7. The battery storage device for an electric vehicle according to claim 6, in, The suction duct is disposed at the center of the vehicle in a lateral direction on the vehicle floor where the battery housing is disposed, and introduces the air in the vehicle compartment through a suction port that faces the front of the vehicle.

8. The battery storage device for an electric vehicle according to claim 7, in, The suction port includes a grille portion having a plurality of holes formed by a plurality of ribs crossing vertically and transversely.

9. The battery storage device for an electric vehicle according to claim 1, in, The battery housing further includes an electrical component, and the electrical component is disposed to be separated from the inner space in which the battery pack is accommodated, and The battery cover covers the battery housing including the internal space and the electrical component, and the battery cover includes a second noise reduction member for the electrical component to surround the electrical component to prevent noise generated by the electrical component from flowing into the vehicle compartment.

10. The battery storage device for an electric vehicle according to claim 9, in, The second noise reduction member for the electric component is bent to cover a front end of the battery case facing the front of the vehicle at an upper end of the electric component.

11. A battery storage device for an electric vehicle, comprising: a battery case that accommodates a battery pack in an internal space of the battery case, wherein the battery case includes an air intake port and an air exhaust port, air in a vehicle compartment is sucked in through the air intake port, air that has cooled the battery pack is discharged to the air exhaust port, and the battery case includes a cooling device connected to the air exhaust port so that the air in the vehicle compartment circulates to the internal space; and a battery cover covering the battery housing, the battery cover having an inflow hole matching the air intake port when mounted to the battery housing, and the battery cover being provided with a first noise reduction member, the first noise reduction member being provided between the cooling device and the inflow hole to prevent a driving sound generated when the cooling device is driven and a noise caused by driving the battery pack from flowing into the vehicle compartment through the inflow hole, wherein the inner space of the battery housing has an upper flow path, the upper flow path is connected to the air intake port, and the upper flow path is inclined upward facing the air intake port, and A void space is provided between the upper end of the battery case and the battery cover, and the first noise reduction member is inserted into the void space between the upper end of the battery case and the battery cover.

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