JP6464999B2 - In-vehicle battery device - Google Patents

Description

  The present invention relates to a structure of an in-vehicle battery device.

  In recent years, an electric vehicle using a motor as a drive source and an electric vehicle such as a hybrid vehicle using a motor and an engine as drive sources are often used. In such an electric vehicle, a secondary battery such as a rechargeable lithium ion battery that supplies electric power to the motor or charges electric power generated when the motor functions as a generator is often used. Yes. A secondary battery such as a lithium ion battery is provided with a gas release valve for releasing a gas generated by overcharging or the like. When the gas released from the gas release valve flows into the vehicle, the CO concentration in the vehicle increases. Therefore, a smoke exhaust duct for discharging the gas released from the gas release valve to the outside of the vehicle is connected to the battery pack that houses the secondary battery. (For example, refer to Patent Document 1).

  Since the smoke exhaust duct communicates with the outside of the vehicle, outside air or foreign matter may flow into the smoke exhaust duct while the vehicle is running, and may flow toward the battery pack. In this case, the thermistor arranged for detecting the battery temperature may read an outside air temperature different from the actual battery temperature as the battery temperature. Moreover, there is a possibility that foreign matter may flow into the battery pack through the smoke exhaust duct. For this reason, in the smoke removal structure for a battery pack described in Patent Document 1, a flow path on the battery pack side and a vehicle exterior side are provided in a smoke emission path in which one end is connected to the battery pack and the other end communicates with the outside of the vehicle. It has been proposed that a throttle channel having a small channel cross-sectional area is provided between the first and second channels to make it difficult for foreign matter such as outside air and dust to enter the battery pack.

Japanese Patent Laying-Open No. 2015-149146

  By the way, when the vehicle crosses the river or travels through the flooded water, there is a possibility that water may enter through the exhaust port that is a gas exhaust port of the smoke exhaust duct to the outside of the vehicle. In the smoke removal structure of the battery pack described in Patent Document 1, the infiltrated water may reach the battery pack. When the battery pack is submerged, the secondary battery housed in the battery pack may be submerged in water and break down.

  In view of this, the present invention allows the secondary battery to be submerged even when water enters the exhaust port of the smoke exhaust duct that discharges the gas generated inside the secondary battery disposed in the vehicle to the outside of the vehicle. It aims at suppressing.

  The in-vehicle battery device of the present invention includes a plurality of secondary batteries each having an exhaust gas part that exhausts the gas generated inside to the outside, a smoke exhaust channel that collects the gas exhausted from each exhaust gas part, A casing for accommodating each secondary battery and the smoke exhaust passage, and a battery pack mounted in the vehicle, one end connected to the smoke exhaust passage, and the other end communicating with the outside of the vehicle. A smoke exhaust duct for exhausting the gas to the outside of the vehicle, a drain hole provided in a portion of the smoke exhaust duct disposed in the vehicle, and a drain hole communicating the interior of the smoke exhaust duct with the interior of the vehicle; A valve provided in a smoke duct, the valve comprising: a first valve seat disposed in the smoke exhaust duct; a second valve seat disposed around the drain hole; and the first valve seat. Or a single valve body seated on the second valve seat, and generating no gas. Sometimes, the valve body is seated on the first valve seat to block between the outside of the vehicle and the battery pack, and when the gas is generated, the valve body is separated from the first valve seat by the gas pressure. The battery pack and the outside of the vehicle are opened apart, and seated on the second valve seat to close the drain hole.

  The present invention suppresses infiltration of a secondary battery even when water enters from an exhaust port of a smoke exhaust duct that discharges gas generated inside the secondary battery disposed in the vehicle to the outside of the vehicle. can do.

It is the fragmentary top view seen from the vehicle upper direction of the vehicle-mounted battery apparatus in embodiment of this invention mounted in the vehicle. It is the partial side view seen from the vehicle front of the vehicle-mounted battery apparatus in embodiment of this invention mounted in the vehicle. It is a disassembled perspective view of a part of the smoke exhaust duct of the in-vehicle battery device in the embodiment of the present invention. It is sectional drawing of the valve provided in the smoke exhaust duct of the vehicle-mounted battery apparatus in embodiment of this invention. It is a figure which shows the state of the valve when water penetrate | invades into the smoke exhaust duct in embodiment of this invention, and the discharge path | route of water. It is a figure which shows the state of the valve at the time of gas generation in embodiment of this invention, and the discharge route of gas.

  Hereinafter, an in-vehicle battery device 100 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial plan view of an in-vehicle battery device 100 mounted on a vehicle 40 as viewed from above the vehicle 40 and shows the casing 15 so that the lithium ion battery 10 accommodated therein can be seen. A part is cut away. FIG. 2 is a partial side view of the in-vehicle battery device 100 mounted on the vehicle 40 as viewed from the front of the vehicle 40 and shows the casing 15 so that the lithium ion battery 10 accommodated therein can be seen. A part is cut away. As shown in FIGS. 1 and 2, the battery device 100 of the present embodiment accommodates a lithium ion battery 10 as a secondary battery and a smoke exhaust passage 13 in a casing 15 and is mounted in a vehicle 40. The battery pack 20, the smoke exhaust duct 17 connected to the smoke exhaust passage 13, and the exhaust duct 17 disposed in the vehicle 40, and drainage that communicates between the smoke exhaust duct 17 and the vehicle 40. A hole 36 and a valve 30 provided in the smoke exhaust duct 17 are provided. As shown in FIGS. 1 and 2, the battery pack 20 and the smoke exhaust duct 17 are mounted in a vehicle rear portion 80, for example, a vehicle 40 below the trunk. 1 to 6, the vertical and horizontal displays and the front and rear displays indicate the vertical and horizontal and front and rear directions of the vehicle 40.

  The lithium ion battery 10 includes a power generation element having a thickness of a positive electrode plate including a positive electrode active material layer and a negative electrode plate including a negative electrode active material layer sandwiched between layers and wound in a spiral shape together with an electrolyte. It is housed in a thin square container. As shown in FIGS. 1 and 2, an exhaust gas section 11 is attached to the center of the upper surface of the container of the lithium ion battery 10 to break and open when the pressure in the container rises, and to release the gas in the container to the outside of the container. Yes. A plurality of lithium ion batteries 10 are stacked and stored in the casing 15 in the thickness direction, and the exhaust gas part 11 is broken and opened above the exhaust gas part 11 attached to the container of the stacked lithium ion battery 10. At this time, a smoke exhaust passage 13 for collecting the gas blown out from the container is attached. As shown in FIGS. 1 and 2, the smoke exhaust passage 13 has a duct shape with a square cross section, and one end thereof is an outlet nozzle 14 projecting from the casing 15 to the outside.

  A smoke exhaust duct 17 is connected to the outlet nozzle 14 of the smoke exhaust passage 13 via a flange 16. The smoke exhaust duct 17 includes a straight portion 17 a on the side close to the flange 16 and a curved portion 17 b on the side far from the flange 16. The straight portion 17a extends from the outlet nozzle 14 toward the left side of the vehicle, and the curved portion 17b curves downward from the straight portion 17a toward the hole 42 provided in the floor panel 41 of the vehicle 40. The distal end portion of the curved portion 17 b is inserted into the hole 42, and the exhaust port 18 of the smoke exhaust duct 17 protrudes outside the vehicle 40. A valve 30 including a first valve seat 31, a second valve seat 35, and a valve body 32 is disposed in the straight portion 17a.

  FIG. 3 is an exploded perspective view showing a part of the straight line portion 17a of the smoke exhaust duct 17 in an exploded manner, and a part of the straight part 17a is drawn through. As shown in FIG. 3, the cross-sectional shape of the portion of the straight portion 17a where the valve 30 is arranged is substantially composed of a bottom plate 17c, a ceiling plate 17d, a vehicle front side plate 17e, and a vehicle rear side plate 17f. It has a square cross section. In the middle of the straight line portion 17a from the valve 30 toward the left side of the vehicle, the cross-sectional shape changes from a substantially square cross section to a circular cross section. The straight portion 17a is not completely horizontal, and the battery pack 20 side is slightly lower than the exhaust port 18 side. A drain hole 36 is provided in the vehicle front side plate 17e. The straight line portion 17 a is disposed in the vehicle 40, and the drain hole 36 is a hole that allows the smoke exhaust duct 17 and the vehicle 40 to communicate with each other. FIG. 4 is a cross-sectional view of a portion where the valve 30 of the straight portion 17a is disposed. As shown in FIGS. 3 and 4, the first valve seat 31 of the valve 30 includes a flat plate-like substrate 31 a having an opening 33 in the center, and a seal portion 31 b that is a protrusion formed at the periphery of the opening 33 of the substrate 31 a. It is comprised including. The second valve seat 35 of the valve 30 includes a vehicle front side plate 17e around the drain hole 36 and a seal portion 35a that is a protrusion formed at the periphery of the drain hole 36 of the vehicle front side plate 17e. . The valve body 32 of the valve 30 includes a flat valve body main body 32a and an elongated hinge portion 32b.

  As shown in FIG. 3, the substrate 31a of the first valve seat 31 is connected to the straight portion 17a substantially perpendicularly to the bottom plate 17c. Moreover, the board | substrate 31a of the 1st valve seat 31 inclines about 45 degrees with respect to the duct axial direction of the linear part 17a, and is connected. As shown by the arrow 91 in FIG. 3 and FIG. 4, the elongated hinge portion 32b of the valve body 32 is located at a position near the connection portion between the base plate 31a of the first valve seat 31 and the vehicle front side plate 17e. It is attached substantially perpendicular to.

  The valve body 32a of the valve body 32 is rotatable about the hinge portion 32b as a rotation axis. The valve body 32 a rotates and can contact the surface of the seal portion 31 b of the first valve seat 31 to cover the opening 33. That is, the valve body 32 can open and close the opening 33. Further, the valve body 32a can rotate and contact the surface of the seal portion 35a of the second valve seat 35 to cover the drain hole 36. That is, the drain hole 36 is disposed at a position where it can be covered by the valve body 32 and can be opened and closed by the valve body 32.

  When no gas is generated in the lithium ion battery 10, that is, in a normal state, the valve body 32 a contacts the surface of the seal portion 31 b of the first valve seat 31 and covers the opening 33. This is due to the following reason. As described above, the linear portion 17a provided with the valve 30 is not completely horizontal, and the battery pack 20 side is slightly lower than the exhaust port 18 side. Therefore, the valve body 32a is pressed against the surface of the seal portion 31b of the first valve seat 31 by its own weight. Further, when the vehicle 40 travels, the inside of the vehicle 40 becomes negative pressure, and the outside air that is the air outside the vehicle 40 is directed from the exhaust port 18 of the smoke exhaust duct 17 toward the battery pack 20 disposed in the vehicle 40. It flows backward and tries to flow into the battery pack 20. Then, a differential pressure is generated between the battery pack 20 side and the exhaust port 18 side of the valve body 32a in contact with the surface of the seal portion 31b of the first valve seat 31 by its own weight. The main body 32 a is further pressed against the surface of the seal portion 31 b of the first valve seat 31.

  Next, the state of the valve 30 and the water discharge path when water enters the smoke exhaust duct 17 in a normal state where no gas is generated in the lithium ion battery 10 will be described with reference to FIG. As described above, in a normal state, as shown in FIG. 5, the valve body 32 a contacts the surface of the seal portion 31 b of the first valve seat 31 and covers the opening 33. That is, the valve body 32 is seated on the first valve seat 31 to block the space between the vehicle 40 and the battery pack 20. Further, the valve body 32 is separated from the second valve seat 35 and opens the drain hole 36. The white arrow in FIG. 5 indicates the path of water. When water enters from the exhaust port 18 of the smoke exhaust duct 17 due to the vehicle 40 traveling on the flooded channel or the like, the water proceeds in the smoke exhaust duct 17 toward the battery pack 20 side. Since the opening 33 is blocked by the valve body 32, the water that has entered the smoke exhaust duct 17 passes through the drain hole 36 provided in the vehicle front side plate 17 e of the smoke exhaust duct 17 and is outside the smoke exhaust duct 17. Quickly discharged. Therefore, water does not enter the battery pack 20 and the failure of the lithium ion battery 10 can be prevented. Further, even when the amount of water entering the smoke exhaust duct 17 is large or when the water pressure is high, it is possible to prevent water from entering the battery pack 20 beyond the valve 30.

  Next, the state of the valve 30 and the gas discharge path when gas is generated from the lithium ion battery 10 will be described with reference to FIG. When a gas is generated inside the lithium ion battery 10 due to a short circuit or the like and the pressure inside the container rises, the exhaust gas part 11 provided at the center of the upper surface of the container is broken and opened, and the gas flows into the smoke exhaust passage 13. Flows to the flue gas duct 17. At this time, the valve body 32a is rotated toward the vehicle front side plate 17e by the pressure of the gas, and is pressed against the surface of the seal portion 35a of the second valve seat 35 as shown in FIG. That is, the valve body 32 is seated on the second valve seat 35 and the drain hole 36 is closed. Further, the valve body 32 is separated from the first valve seat 31 and the space between the battery pack 20 and the outside of the vehicle 40 is opened. In FIG. 6, thick black arrows indicate gas paths. The gas flows through the opening 33 released by the rotation of the valve body 32 a to the vehicle front side plate 17 e, flows toward the exhaust port 18 of the smoke exhaust duct 17, and is discharged outside the vehicle 40. In addition, since the drain hole 36 communicating the inside of the smoke exhaust duct 17 and the inside of the vehicle 40 is blocked, the gas is prevented from flowing out into the vehicle 40 through the drain hole 36.

  According to the battery device 100 of the embodiment described above, even when water enters from the exhaust port 18 of the smoke exhaust duct 17 that discharges the gas generated inside the lithium ion battery 10 to the outside of the vehicle 40, the battery pack. Since water can be prevented from entering 20, failure of the lithium ion battery 10 can be prevented. Therefore, the reliability and safety of the vehicle 40 are improved. Further, since no waterproof protective component is required for the battery pack 20, the weight and size of the battery pack 20 can be reduced. When the gas is discharged out of the vehicle 40, the valve body 32 opens between the vehicle 40 and the battery pack 20, and the gas is reliably discharged out of the vehicle 40, and the valve body 32 is in the smoke exhaust duct 17. Since the drain hole 36 communicating with the inside of the vehicle 40 is closed, gas is not leaked into the vehicle 40 and is safe.

  In the battery device 100 according to the embodiment described above, as shown in FIG. 3, the drain holes 36 provided in the vehicle front side plate 17e have the same distance from the ceiling plate 17d and the bottom plate 17c, that is, in the vertical direction. In the middle. As another configuration, the drain hole 36 may be provided in a portion as close to the bottom plate 17c as possible within a range that the valve body 32 can cover. In the case of this configuration, water is more effectively discharged from the drain hole 36, and water intrusion to the battery pack 20 side is suppressed.

  Further, in the battery device 100 of the embodiment described above, in a normal state where the gas of the lithium ion battery 10 is not generated, the valve body 32a is placed on the surface of the seal portion 31b of the first valve seat 31 by its own weight. Although described as abutting, as will be described below, the valve body 32a may be attracted to the seal portion 31b of the first valve seat 31 with a weak attracting force as well as simply abutting by its own weight.

  In this case, the substrate 31a and the seal portion 31b of the first valve seat 31 shown in FIG. 4 are made of polypropylene (PP), and the valve body 32a is made of olefin elastomer (TPO). Then, while the valve body 32a is in contact with the seal portion 31b of the first valve seat 31 by its own weight, the space between the seal portion 31b made of polypropylene (PP) and the valve body main body 32a made of olefin elastomer (TPO). A weak adsorption force is generated. This adsorption force is an adsorption force that does not cause the valve body 32a to flutter due to vibration caused by running of the vehicle 40 in a normal state where there is no gas generation in the lithium ion battery 10, and within the lithium ion battery 10 The adsorption force is such that the generated gas is peeled off by the pressure when flowing into the smoke exhaust duct 17.

  In the embodiment described above, the contact of the valve body 32a with the seal portion 31b of the first valve seat 31 is suitably maintained in a normal state where there is no gas generation in the lithium ion battery 10, and the vehicle 40 outside Since the state in which the space between the battery pack 20 and the battery pack 20 is maintained is maintained, it is possible to effectively prevent water that has entered the smoke exhaust duct 17 from entering the battery pack 20 beyond the valve 30. .

  DESCRIPTION OF SYMBOLS 10 Lithium ion battery, 11 Exhaust part, 13 Exhaust flow path, 14 Outlet nozzle, 15 Casing, 16 Flange, 17 Exhaust duct, 17a Straight part, 17b Curved part, 17c Bottom plate, 17d Ceiling plate, 17e Vehicle front side plate, 17f Vehicle rear side plate, 18 exhaust port, 20 battery pack, 30 valve, 31 first valve seat, 31a substrate, 31b seal part, 32 valve body, 32a valve body body, 32b hinge part, 33 opening, 35 second valve Seat, 35a Sealing part, 36 Drain hole, 40 Vehicle, 41 Floor panel, 42 hole, 50 Car compartment, 61 Main body, 62 Upper half part, 80 Vehicle rear part, 91, 92 Arrow, 100 Battery device.

Claims (1)

An in-vehicle battery device,
A plurality of secondary batteries each having an exhaust gas part for discharging gas generated inside to the outside, a smoke exhaust passage for collecting the gas exhausted from each of the exhaust gas parts, each secondary battery and the exhaust gas A casing for housing the flow path, and a battery pack mounted in the vehicle,
One end is connected to the smoke exhaust passage, the other end communicates with the outside of the vehicle, and a smoke exhaust duct for discharging the gas to the outside of the vehicle;
A drainage hole provided in a portion of the smoke exhaust duct disposed in the vehicle, and communicating between the smoke exhaust duct and the vehicle;
A valve provided in the smoke exhaust duct;
With
The valve includes a first valve seat disposed in the smoke exhaust duct, a second valve seat disposed around the drain hole, and one seated on the first valve seat or the second valve seat. A valve body,
When the gas is not generated, the valve body is seated on the first valve seat to block between the outside of the vehicle and the battery pack,
When the gas is generated, the valve body is separated from the first valve seat by the gas pressure, opens between the battery pack and the outside of the vehicle, and sits on the second valve seat to An in-vehicle battery device characterized by closing a drain hole.

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