JP2006187181A - Exhaust device for vehicle power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust device with superior mounting characteristics for a vehicle power supply, in which a gas generated at the battery is promptly exhausted to the outside of the vehicle. <P>SOLUTION: The exhaust device 10 of a vehicle power supply includes a cooling air exhaust path 21 for exhausting cooling air, which has been fed toward a lithium ion battery; a branch path 24 branched from the cooling air exhaust path 21 and extending independently from the cooling air exhaust path 21 to the outside of the vehicle; a nylon thread 32, which receives heat temperature from gas flowing on the downstream side of a cooling air flow for the lithium ion battery and is disconnected, when if the received heat temperature becomes a previously set temperature or higher; and a division plate 31 arranged at the branch path 24 and jointed with a nylon thread 32. The dividing plate 31 blocks the branch path 24, when it is supported by the nylon thread 32 and opens the branch path 24, when the nylon thread 32 is disconnected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to an exhaust device for a vehicle power source, and more particularly to an exhaust device for a vehicle power source made of a lithium ion battery.

  Regarding a conventional exhaust device for a vehicle power supply, for example, Japanese Patent Application Laid-Open No. 9-283106 discloses a battery exhaust gas control system for the purpose of improving waterproofness and moisture resistance (Patent Document 1). The exhaust gas control system disclosed in Patent Document 1 includes a communication passage that communicates with each battery cell and exhausts hydrogen gas generated from the battery cell. A pressure detector is disposed in the communication path. When the pressure detector detects that the pressure in the communication path has reached a predetermined value, the control valve is opened, and hydrogen gas is discharged from the communication path to the outside.

  Japanese Patent Application Laid-Open No. 11-234801 discloses a vehicle battery device for quickly discharging gas generated in a battery cell to the outside of the vehicle (Patent Document 2). In the vehicle battery device disclosed in Patent Document 2, a temperature sensor for detecting the temperature of the battery cell is attached to the battery block.

Japanese Laid-Open Patent Publication No. 10-306722 discloses a vehicle battery cooling system for the purpose of efficiently cooling a battery using air in a vehicle interior (Patent Document 3). In the vehicle battery cooling system disclosed in Patent Document 3, a cooling air temperature sensor for detecting the temperature of the cooling air sent to the battery is provided in the cooling duct. Furthermore, Japanese Patent Application Laid-Open No. 2002-223507 discloses a vehicle power supply device that aims to reduce the number of parts without impairing gas safety (Patent Document 4).
JP-A-9-283106 Japanese Patent Laid-Open No. 11-234801 JP-A-10-306722 JP 2002-223507 A

  In the exhaust gas control system disclosed in Patent Document 1, a communication path for temporarily filling hydrogen gas generated from a battery cell is provided, and a pressure detector is provided in the communication path. However, the installation of such a structure increases the size of the system and reduces the mountability on the vehicle. Further, when the battery is a lithium ion battery, a gas having a relatively high temperature is generated from the battery at the time of overcharging. Therefore, it is preferable that the gas is quickly led out of the vehicle compartment.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to provide an exhaust device for a vehicle power source that is excellent in mountability and quickly exhausts gas generated in a battery to the outside of the vehicle compartment.

  An exhaust device for a vehicle power supply according to one aspect of the present invention includes a cooling air exhaust passage that exhausts cooling air supplied toward a lithium ion battery, a cooling air exhaust passage, and a cooling air exhaust passage. The heat is received from the branch passage that extends independently and communicates with the outside of the vehicle compartment, and the gas that flows downstream of the cooling air flow with respect to the lithium ion battery, and when the heat receiving temperature is equal to or higher than a predetermined temperature, A deformable member that changes to the second state; and a first blocking member that is provided in the branch passage and connected to the deformable member. The first blocking member blocks the branch passage when the deforming member is in the first state, and opens the branch passage when the deforming member changes to the second state.

  According to the exhaust device for a vehicle power source configured as described above, the gas generated in the lithium ion battery has a temperature higher than the temperature of the cooling air flowing in the cooling air exhaust passage. Changes from the first state to the second state. At this time, since the first blocking member opens the branch passage, gas can be guided from the cooling air exhaust passage to the branch passage together with the cooling air. Thereby, gas can be quickly discharged out of the vehicle compartment. The branch passage for guiding the gas to the outside of the vehicle compartment is branched from the cooling air exhaust passage. For this reason, the passage can be shared between the lithium ion battery and the position where the branch passage branches from the cooling air exhaust passage. Thereby, an exhaust device can be reduced in size and the mounting property with respect to a vehicle can be improved.

  Further, the cooling air exhaust passage communicates with the vehicle compartment. According to the exhaust device for a vehicle power source configured as described above, the indoor environment can be maintained by guiding the gas generated in the lithium ion battery to the branch passage.

  Preferably, the exhaust device for a vehicle power supply further includes a gas flow adjusting unit provided in the cooling air exhaust passage and located downstream of the cooling air flow with respect to the position where the branch passage branches. The gas flow adjusting unit suppresses the gas flow in the cooling air exhaust passage when the deformable member is in the second state. According to the exhaust device for a vehicle power source configured as described above, the gas generated in the lithium ion battery can be more actively guided to the branch passage.

  Further preferably, the gas flow adjusting unit is a second blocking member connected to the deformable member. The second blocking member opens the cooling air exhaust passage when the deforming member is in the first state, and blocks the cooling air exhaust passage when the deformation member changes to the second state. According to the exhaust device for a vehicle power source configured as described above, when gas is generated in the lithium ion battery, the flow of the cooling air in the cooling air exhaust passage is completely restricted. For this reason, the generated gas can be more actively guided to the branch passage.

  An exhaust device for a vehicle power supply according to another aspect of the present invention includes a cooling air exhaust passage that exhausts cooling air supplied toward a lithium ion battery, a cooling air exhaust passage, and a cooling air exhaust passage. A branch passage that extends independently and communicates with the outside of the vehicle compartment, a temperature detector that detects the temperature of the gas that flows downstream of the cooling air flow with respect to the lithium ion battery, and a branch passage that is provided for detection by the temperature detector. A blocking member that shuts off the branch passage when the gas temperature is lower than a predetermined temperature and opens the branch passage when the temperature exceeds a predetermined temperature and guides the gas generated in the lithium ion battery to the branch passage; Prepare.

  According to the exhaust device for a vehicle power source configured as described above, the gas generated in the lithium ion battery has a temperature higher than the temperature of the cooling air flowing in the cooling air exhaust passage, so that when the gas is generated, the temperature is detected. The temperature of the gas detected by the unit is equal to or higher than a predetermined temperature. At this time, since the blocking member opens the branch passage, it can guide the gas together with the cooling air from the cooling air exhaust passage to the branch passage. Thereby, gas can be quickly discharged out of the vehicle compartment. The branch passage for guiding the gas to the outside of the vehicle compartment is branched from the cooling air exhaust passage. For this reason, the passage can be shared between the lithium ion battery and the position where the branch passage branches from the cooling air exhaust passage. Thereby, an exhaust device can be reduced in size and the mounting property with respect to a vehicle can be improved.

  An exhaust device for a vehicle power supply according to still another aspect of the present invention includes a cooling air exhaust passage that exhausts cooling air supplied to a lithium ion battery, a cooling air exhaust passage that branches off from the cooling air exhaust passage, Are provided independently at a branch passage that leads to the outside of the vehicle compartment, and the branch passage is branched from the cooling air exhaust passage. When the flow rate of the gas flowing through the position exceeds a predetermined value, the first state is And a valve that changes to the second state. When the valve is in the first state, the valve opens the cooling air exhaust passage and blocks the branch passage. When the valve is in the second state, the valve opens the branch passage and blocks the cooling air exhaust passage.

  According to the exhaust device for a vehicle power source configured as described above, since the gas flowing to the position where the valve is normally provided is only the cooling air, the valve is held in the first state. At this time, the cooling air flows through the cooling air exhaust passage without being guided to the branch passage. On the other hand, when gas is generated in the lithium ion battery, the gas flows in addition to the cooling air to the position where the valve is provided. For this reason, the flow rate of the gas increases, and the valve changes from the first state to the second state. As a result, the branch passage is opened and the cooling air exhaust passage is blocked. For this reason, the cooling air can be guided to the branch passage and quickly discharged outside the vehicle compartment. The branch passage for guiding the gas to the outside of the vehicle compartment is branched from the cooling air exhaust passage. For this reason, the passage can be shared between the lithium ion battery and the position where the branch passage branches from the cooling air exhaust passage. Thereby, an exhaust device can be reduced in size and the mounting property with respect to a vehicle can be improved.

  As described above, according to the present invention, it is possible to provide an exhaust device for a vehicle power source that is excellent in mountability and quickly discharges gas generated from a battery to the outside of the vehicle compartment.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is a schematic diagram showing an exhaust device for a vehicle power supply according to Embodiment 1 of the present invention. The vehicle power source exhaust device according to the present embodiment is mounted on a hybrid vehicle that is driven by using a lithium ion battery and an internal combustion engine such as a gasoline engine or a diesel engine as power sources.

  Referring to FIG. 1, an exhaust device 10 for a vehicle power supply includes a sealed battery case 13 that houses a lithium ion battery, a cooling air exhaust passage 21 that extends from the battery case 13 into the vehicle compartment, and a cooling air exhaust passage. And a branch passage 24 that branches from the vehicle 21 and extends to the outside of the vehicle compartment. Cooling air is supplied to the lithium ion battery by the blower blower 12 connected to the battery case 13. The supplied cooling air cools the lithium ion battery and then is discharged from the battery case 13 to the cooling air exhaust passage 21.

  The cooling air exhaust passage 21 has a cooling air inlet 21m connected to the battery case 13 and a cooling air exhaust port 21n leading to the vehicle compartment. The branch passage 24 is located between the cooling air inlet 21m and the cooling air exhaust port 21n, and has a branch part 24m connected to the cooling air exhaust passage 21 and a gas exhaust port 24n communicating with the outside of the vehicle compartment. The cooling air exhaust passage 21 and the branch passage 24 extend independently between the cooling air inflow port 21m and the cooling air exhaust port 21n and between the branching portion 24m and the gas exhaust port 24n without being in communication with each other. ing.

  The cooling air exhaust passage 21 is provided with a fixing pin 37 located between the cooling air inlet 21m and the branch portion 24m. In the branch passage 24, a partition plate 31 is provided between the branch portion 24m and the gas discharge port 24n. The cooling air exhaust passage 21 is provided with a partition plate 41 located between the branch portion 24m and the cooling air exhaust port 21n. The exhaust device 10 is provided with a nylon thread 32 having both ends fixed to the fixing pin 37 and the partition plate 31, and a nylon thread 42 having both ends fixed to the fixing pin 37 and the partition plate 41, respectively.

  The partition plate 31 is supported by a nylon thread 32 at a position where the branch passage 24 is blocked. At this time, the flow of cooling air from the branch portion 24m toward the gas discharge port 24n is restricted. In addition, the partition plate 41 is supported by a nylon thread 42 in a groove portion 43 disposed in the gravity upward direction of the cooling air exhaust passage 21. At this time, the cooling air exhaust passage 21 is open, and a cooling air flow from the cooling air inlet 21m toward the cooling air outlet 21n is allowed. With such a configuration, at the normal time shown in FIG. 1, the cooling air that has cooled the lithium ion battery is discharged from the battery case 13 and then passes through the cooling air exhaust passage 21 without passing through the branch passage 24. Returned to the vehicle compartment.

  FIG. 2 is a schematic diagram showing a state of the exhaust device in FIG. 1 when gas is generated. Referring to FIG. 2, when extreme overcharging is performed, gas may be generated from the lithium ion battery. This gas has a higher temperature than the cooling air discharged from the battery case 13. Therefore, when gas is generated from the lithium ion battery and flows in the cooling air exhaust passage 21, the gas breaks the nylon yarns 32 and 42 when the gas flows from the cooling air inlet 21m toward the branch portion 24m.

  As a result, the partition plate 31 loses support by the nylon thread 32 and falls into the concave portion 33 arranged in the gravity lower direction of the partition plate 31. Thereby, the branch passage 24 is opened, and the gas flow from the branch part 24m toward the gas discharge port 24n is allowed. Further, the partition plate 41 loses support by the nylon thread 42 and falls into the cooling air exhaust passage 21. As a result, the cooling air exhaust passage 21 is blocked, and the gas flow from the cooling air inlet 21m toward the cooling air outlet 21n is restricted. As a result, the gas generated from the lithium ion battery is quickly discharged out of the vehicle compartment from the branch passage 24 without being returned to the vehicle compartment.

  An exhaust device 10 for a vehicle power source according to Embodiment 1 of the present invention branches from a cooling air exhaust passage 21 that exhausts cooling air supplied toward a lithium ion battery, and a cooling air exhaust passage 21, and is provided with a cooling air exhaust passage. The heat is received from the branch passage 24 that extends independently of the vehicle compartment 21 and communicates to the outside of the vehicle compartment, and the gas that flows downstream of the cooling air flow with respect to the lithium ion battery. A nylon thread 32 as a deforming member that changes from the first state to the second state, and a partition plate 31 that is provided in the branch passage 24 and is connected to the nylon thread 32 as a first blocking member. When the nylon thread 32 is in the first state, that is, when the partition plate 31 is supported, the partition plate 31 blocks the branch passage 24 and changes to the second state, that is, when the wire breaks. The passage 24 is opened.

  The exhaust device 10 of the vehicle power source is a gas flow adjusting unit provided in the cooling air exhaust passage 21 that is located downstream of the cooling air flow with respect to the branching portion 24m as a position where the branch passage 24 branches. A partition plate 41 is further provided. The partition plate 41 suppresses the flow of gas in the cooling air exhaust passage 21 when the nylon thread 42 as the deforming member is in the second state, that is, when it is disconnected.

  Even when only the partition plate 31 is provided, the gas generated in the lithium ion battery can be guided outside the vehicle compartment. Further, in the present embodiment, the nylon threads 32 and 42 are provided to support the partition plates 31 and 41 at predetermined positions, respectively, but the nylon threads 32 and 42 are formed of a single nylon thread. Also good.

  Further, a butterfly valve may be provided in the cooling air exhaust passage 21 instead of the partition plate 41. In this case, normally, the butterfly valve is positioned so that the valve body of the valve extends parallel to the cooling air flow. When gas is generated from the lithium ion battery, the nylon thread 42 fixed to the butterfly valve is disconnected, and the butterfly valve is moved to a position where the valve body extends obliquely or perpendicularly to the cooling air flow by a spring force or the like. ,Rotate.

  Further, instead of the nylon thread 32 and the partition plate 31, a partition plate made of a shape memory member may be provided in the branch passage 24. In this case, the partition plate has a shape that blocks the branch passage 24 in the normal temperature range of the cooling air discharged from the battery case 13. When the gas generated in the lithium ion battery is mixed in the cooling air and the cooling air temperature rises, the partition plate is deformed into a shape that opens the branch passage 24. Such a partition plate may be provided in place of the nylon thread 42 and the partition plate 41.

  Further, in the drawing, the cooling air exhaust passage 21 is shown on the upper side and the branch passage 24 is shown on the lower side, but the branch passage 24 may be arranged in the direction of gravity above the cooling air exhaust passage 21. Since the gas generated in the lithium ion battery is slightly lighter than air, in this case, the gas can be more effectively guided to the branch passage 24.

  According to the exhaust device 10 for a vehicle power supply configured as described above, the gas generated in the lithium ion battery is quickly discharged out of the vehicle compartment. For this reason, it is possible to avoid a situation in which the passenger feels uncomfortable due to the smell of gas, and the indoor environment can be maintained. The branch passage 24 is formed by branching from the cooling air exhaust passage 21. For this reason, the space between the cooling air inlet 21m and the branching portion 24m of the cooling air exhaust passage 21 can be used as a passage for discharging the gas generated in the lithium ion battery. For this reason, the exhaust device 10 can be reduced in size, and the mountability of the exhaust device 10 to the vehicle can be improved.

(Embodiment 2)
FIG. 3 is a schematic diagram showing an exhaust device for a vehicle power source according to Embodiment 2 of the present invention. The description of the overlapping structure as compared with the exhaust device 10 for the vehicle power supply in the first embodiment will not be repeated.

  Referring to FIG. 3, in the present embodiment, a temperature sensor 51 is arranged in cooling air exhaust passage 21, located between cooling air inlet 21 m and branching portion 24 m. The exhaust device further includes an actuator 53 connected to the partition plates 31 and 41 for opening and closing these partition plates. As the actuator 53, for example, a motor or a hydraulic cylinder can be used. The temperature sensor 51 and the actuator 53 are electrically connected to an ECU (Electronic Control Unit).

  With such a configuration, when the temperature detected by the temperature sensor 51 is in the normal temperature range of the cooling air discharged from the battery case 13, the partition plate 31 is positioned so as to block the branch passage 24 by the actuator 53. The partition plate 41 is positioned in the groove 43. Next, when gas is generated in the lithium ion battery and the temperature detected by the temperature sensor 51 is equal to or higher than the normal temperature range of the cooling air, the ECU 52 that has received the temperature information from the temperature sensor 51 changes the partition plate 31. The actuator 53 is instructed to drive to a position where it is accommodated in the recess 33 and to drive the partition plate 41 to a position where the cooling air exhaust passage 21 is blocked. As a result, the gas generated in the lithium ion battery is guided to the branch passage 24 and quickly discharged from the branch passage 24 to the outside of the vehicle compartment.

  The exhaust device for a vehicle power source according to Embodiment 2 of the present invention branches from a cooling air exhaust passage 21 that exhausts the cooling air supplied toward the lithium ion battery, and the cooling air exhaust passage 21, and the cooling air exhaust passage 21. A branch passage 24 that extends independently from the vehicle compartment, a temperature sensor 51 as a temperature detection unit that detects the temperature of the gas flowing downstream of the cooling air flow with respect to the lithium ion battery, and a branch passage 24. When the temperature of the gas detected by the temperature sensor 51 is lower than a predetermined temperature, the branch passage 24 is shut off, and when the temperature exceeds the predetermined temperature, the branch passage 24 is opened and generated in the lithium ion battery. And a partition plate 31 as a blocking member that guides the gas to the branch passage 24.

  According to the exhaust device for a vehicle power source in the second embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained.

(Embodiment 3)
FIG. 4 is a schematic diagram showing an exhaust device for a vehicle power source according to Embodiment 3 of the present invention. The description of the overlapping structure as compared with the exhaust device 10 for the vehicle power supply in the first embodiment will not be repeated.

  Referring to FIG. 4, in the present embodiment, cooling air exhaust passage 21 is formed to be bent between cooling air inlet 21m and cooling air outlet 21n. The branch passage 24 branches from the cooling air exhaust passage 21 at the bent position. The cooling air exhaust passage 21 extends in one direction between the cooling air inlet 21m and the branch portion 24m, and the branch passage 24 further extends in the same direction as the direction from the branch portion 24m. The branch portion 24m is provided with a butterfly valve 63 having a valve shaft 62 rotatably supported and valve bodies 63m and 63n extending toward both sides of the valve shaft 62, respectively.

  The valve shaft 62 is disposed at a corner portion between the cooling air exhaust passage 21 and the branch passage 24. The valve body 63m swings around the valve shaft 62 between a position where the cooling air exhaust passage 21 and the branch passage 24 are blocked and a position where the valve body 63m extends parallel to the cooling air flow in the branch passage 24. Dynamic movement. The valve body 63n swings around the valve shaft 62 between a position extending in parallel with the cooling air flow in the cooling air exhaust passage 21 and a position blocking the cooling air exhaust passage 21.

  In the normal state, in the butterfly valve 63, the valve body 63m blocks between the cooling air exhaust passage 21 and the branch passage 24 by the spring force, and the valve body 63n is parallel to the cooling air flow in the cooling air exhaust passage 21. It is positioned at a position extending to. At this time, the cooling air is returned from the cooling air exhaust passage 21 into the vehicle compartment without being guided to the branch passage 24.

  When gas is generated in the lithium ion battery, the flow rate of gas flowing from the battery case 13 into the cooling air inlet 21m increases. The gas flowing into the cooling air inlet 21m presses the valve body 63m ahead of the flow, overcomes the spring force that urges the butterfly valve 63, and rotates the butterfly valve 63 in the direction indicated by the arrow 101 in the figure. Let Thereby, the butterfly valve 63 is positioned at a position where the valve body 63n blocks the cooling air exhaust passage 21 and the valve body 63m extends in the branch passage 24 in parallel with the cooling air flow. As a result, the gas generated in the lithium ion battery is guided to the branch passage 24 and discharged from the branch passage 24 to the outside of the vehicle compartment.

  The exhaust device for a vehicle power source according to Embodiment 3 of the present invention branches from a cooling air exhaust passage 21 that exhausts the cooling air supplied toward the lithium ion battery, and the cooling air exhaust passage 21, and the cooling air exhaust passage 21. Is provided at a position where the branch passage 24 branches from the cooling air exhaust passage 21 and the flow rate of the gas flowing through the position exceeds a predetermined value. And a butterfly valve 63 as a valve that changes from the first state to the second state. The butterfly valve 63 opens the cooling air exhaust passage 21 and blocks the branch passage 24 when in the first state. The butterfly valve 63 opens the branch passage 24 and shuts off the cooling air exhaust passage 21 when in the second state.

  The exhaust device of the vehicle power supply further includes a spring as an elastic member that applies an elastic force to the butterfly valve 63 in the direction in which the butterfly valve 63 is held in the first state. When the flow rate of the gas flowing through the position where the butterfly valve 63 is provided exceeds a predetermined value, the force with which the gas presses the butterfly valve 63 is greater than the elastic force of the spring, and the butterfly valve 63 is Change to state.

  According to the exhaust apparatus for a vehicle power source in Embodiment 3 of the present invention configured as described above, the same effect as that described in Embodiment 1 can be obtained. In addition, since both the cooling air exhaust passage 21 and the branch passage 24 can be opened and closed by the butterfly valve 63, the exhaust device can be simply configured.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram which shows the exhaust apparatus of the power supply for vehicles in Embodiment 1 of this invention. It is a schematic diagram which shows the state at the time of gas generation of the exhaust apparatus in FIG. It is a schematic diagram which shows the exhaust apparatus of the power supply for vehicles in Embodiment 2 of this invention. It is a schematic diagram which shows the exhaust device of the power supply for vehicles in Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Exhaust device, 21 Cooling air exhaust passage, 24 branch passage, 24m branch part, 31, 41 Partition plate, 32, 42 Nylon thread, 51 Temperature sensor, 63 Butterfly valve.

Claims (6)

A cooling air exhaust passage for exhausting the cooling air supplied to the lithium ion battery;
A branch passage that branches off from the cooling air exhaust passage, extends independently of the cooling air exhaust passage, and communicates with the outside of the vehicle compartment;
The deformable member that receives heat from the gas flowing downstream of the cooling air flow with respect to the lithium ion battery and changes from the first state to the second state when the heat receiving temperature is equal to or higher than a predetermined temperature;
A first blocking member provided in the branch passage and connected to the deformable member;
The first shutoff member shuts off the branch passage when the deforming member is in the first state, and opens the branch passage when the deformable member changes to the second state. apparatus.   The exhaust device for a vehicle power source according to claim 1, wherein the cooling air exhaust passage communicates with a vehicle compartment.   Provided in the cooling air exhaust passage located downstream of the cooling air flow with respect to the position where the branch passage branches, and when the deforming member is in the second state, The exhaust device for a vehicle power source according to claim 1, further comprising a gas flow adjusting unit that suppresses a gas flow. The gas flow adjusting unit is a second blocking member connected to the deformable member,
The second shutoff member opens the cooling air exhaust passage when the deformable member is in the first state, and shuts off the cooling air exhaust passage when changed to the second state. Item 4. A vehicle power source exhaust device according to Item 3. A cooling air exhaust passage for exhausting the cooling air supplied to the lithium ion battery;
A branch passage that branches off from the cooling air exhaust passage, extends independently of the cooling air exhaust passage, and communicates with the outside of the vehicle compartment;
A temperature detector for detecting the temperature of the gas flowing downstream of the cooling air flow with respect to the lithium ion battery; and
Provided in the branch passage, when the temperature of the gas detected by the temperature detector is lower than a predetermined temperature, the branch passage is shut off, and when the temperature exceeds the predetermined temperature, the branch passage is opened. An exhaust device for a vehicle power supply, comprising: a blocking member that guides gas generated in the lithium ion battery to the branch passage. A cooling air exhaust passage for exhausting the cooling air supplied to the lithium ion battery;
A branch passage that branches off from the cooling air exhaust passage, extends independently of the cooling air exhaust passage, and communicates with the outside of the vehicle compartment;
The branch passage is provided at a position branched from the cooling air exhaust passage, and a valve that changes from the first state to the second state when the flow rate of the gas flowing through the position becomes a predetermined value or more,
The valve opens the cooling air exhaust passage when in the first state and shuts off the branch passage, and opens the branch passage when in the second state; and An exhaust device for a vehicle power supply that blocks a cooling air exhaust passage.

Images