JP2009012697A - Temperature adjusting structure of electric storage device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise the temperature of a cooling liquid, and to reduce the driving cost when stirring the cooling liquid. <P>SOLUTION: A temperature adjusting structure of an electric storage device comprises an assembled battery 12 for vehicle, a cooling liquid 13 for cooling the assembled battery 12, a casing 11 for storing the assembled battery and the cooling liquid, stirring blades 21 for stirring the cooling liquid, an exhaust pipe 2 for discharging exhaust gas outside a cabin, turbine blades 25 rotated when being abutted by exhaust gas in the exhaust pipe 2, and a torque converter 23 for transmitting the rotational force of the turbine blades 25 to the stirring blades 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a temperature control structure for a power storage device for a vehicle.

  A power storage device used for driving electric vehicles or hybrid vehicles or as an auxiliary power source has excellent energy density and output, and the heat generation temperature associated with charge / discharge increases, so the power storage unit is placed in a coolant with high cooling efficiency. Soaked.

  As this type of power storage device, a method is known in which three secondary batteries are immersed in a cooling liquid, a stirrer, a heat exchanger, a temperature measuring device are installed, and the cooling liquid is circulated to adjust the liquid temperature. (See Patent Document 1). In addition, this type of power storage device is often installed in a heat radiating part such as a floor panel of a vehicle.

  When a plurality of secondary batteries are electrically connected to form a battery assembly, if the temperature of each secondary battery varies, the life of the entire battery is shortened. Therefore, stirring the coolant using a stirrer desirable.

By the way, the secondary battery has an appropriate use temperature. For example, in the case of a lithium ion battery, when the battery temperature is higher than 60 ° C., battery deterioration proceeds, and when the battery temperature is lower than −10 ° C., the vehicle output. It is thought that the battery output corresponding to can not be obtained.
Japanese Patent Laid-Open No. 06-124733 Japanese Patent Laid-Open No. 05-231423

  However, when the temperature of the outside air is low, the heat of the secondary battery is radiated to the outside of the vehicle through the floor panel, so that the battery temperature may be lowered and the battery output corresponding to the vehicle output may not be obtained. .

  Further, when the stirrer is driven by supplying power from a power source, for example, the cost increases due to the consumption of power.

  Therefore, the first object of the present invention is to raise the temperature of the power storage unit whose temperature has dropped. A second object is to drive the stirring member at low cost.

In order to achieve the first and second objects described above, a first configuration of the temperature control structure for a power storage unit according to the present invention includes a vehicle power storage unit, a coolant for cooling the power storage unit, The power storage body and a housing for storing the coolant, a stirring member for stirring the coolant, a discharge pipe for discharging the exhaust gas to the outside of the passenger compartment, and rotating by contacting the exhaust gas in the discharge pipe It has a drive member and the transmission means which transmits the rotational force of the said drive member to the said stirring member, It is characterized by the above-mentioned.

  The transmission means decelerates the rotational force of the drive member and transmits it to the stirring member. In this case, a torque converter can be used as the transmission means.

The exhaust pipe is formed of a main flow path and a sub flow path branched from the main flow path, and the driving member is disposed in the sub flow path, and an inflow of exhaust gas flowing into the sub flow path from the main flow path An adjustment mechanism for adjusting the amount may be provided.

Based on the temperature detection means for detecting the temperature of the coolant, and the detected temperature of the temperature detection means,
A drive control circuit for controlling the drive of the adjustment mechanism, and the drive control circuit allows the inflow of exhaust gas from the main flow path to the sub flow path when the detected temperature is equal to or lower than a threshold value. The driving of the adjusting mechanism may be controlled.

The transmission means includes a first magnetic member that is rotationally driven together with the driving member, and a second magnetic member that is rotationally driven together with the agitating member and is disposed opposite to the first magnetic member, The stirring member may be rotated by a magnetic force acting between the first and second magnetic members in accordance with a rotation operation of the driving member.

The exhaust pipe is formed of a main flow path and a sub flow path branched from the main flow path, and the driving member is disposed in the sub flow path, and an inflow of exhaust gas flowing into the sub flow path from the main flow path Between the adjustment mechanism for adjusting the amount, the first position where the first and second magnetic members are in contact, and the second position where the first and second magnetic members are not in contact with each other, Position changing means for changing the position of the first and / or second magnetic member; temperature detecting means for detecting the temperature of the coolant;
A first drive control circuit for controlling the adjusting mechanism based on a temperature detected by the temperature detecting means;
And a second drive control circuit for controlling the position changing means based on the temperature detected by the temperature detection means, wherein the first and second drive control circuits have the detected temperature lower than a first threshold value. If it is lower, the driving member is rotated while allowing the exhaust gas to flow from the main flow path to the sub flow path with the first and second magnetic members set to the first position. And controlling the adjusting mechanism and the position changing means.

In this case, the control means sets the first and second magnetic members at the second position when the detected temperature is higher than a second threshold value that is higher than the first threshold value. Thus, the adjustment mechanism and the position changing means may be controlled so as to allow the inflow of exhaust gas from the main flow path to the sub flow path and rotate the drive member.

In order to achieve the second object, the second configuration of the temperature control structure of the electric storage body of the present invention is:
A power storage unit for a vehicle, a cooling liquid for cooling the power storage unit, a housing for storing the power storage unit and the cooling liquid, a stirring member for stirring the cooling liquid, and air outside the passenger compartment An intake pipe for intake air, a drive member disposed in the intake pipe and driven by abutting against the air, and a transmission means for transmitting the rotational force of the drive member to the agitation member .

  The transmission means decelerates the rotational force of the drive member and transmits it to the stirring member. In this case, a torque converter can be used as the transmission means.

The intake pipe is formed of a main flow path and a sub flow path that branches from the main flow path, and the drive member is disposed in the sub flow path, and air that flows into the sub flow path from the main flow path It is preferable to provide an adjustment mechanism that adjusts the amount of inflow.

  Temperature detection means for detecting the temperature of the cooling liquid; and a drive control circuit for controlling the driving of the adjusting mechanism based on the temperature detected by the temperature detection means, wherein the detection temperature is less than a threshold value. If it is higher, the adjustment mechanism may be controlled so as to allow the air to flow from the main flow path to the sub flow path and rotate the drive member.

In order to achieve the first object, a third configuration of the temperature adjustment structure for a power storage unit according to the present invention includes a power storage unit for a vehicle, a coolant for cooling the power storage unit, the power storage unit, A housing for housing the coolant; a gas discharge pipe for discharging exhaust gas to the outside of the passenger compartment; and heat transfer means for transferring heat of the exhaust gas in the gas discharge pipe to the coolant. To do.

  According to the first configuration of the present invention, the temperature of the coolant can be raised using the heat of the exhaust gas. Thereby, the output corresponding to a vehicle output can be obtained reliably. Moreover, the driving force of the stirring member can be obtained from the exhaust gas. Thereby, the drive cost of a stirring member can be reduced.

  According to the second configuration of the present invention, the driving force of the stirring member can be obtained from the air passing through the inside of the intake pipe. Thereby, the drive cost of a stirring member can be reduced.

  According to the third configuration of the present invention, the temperature of the coolant can be raised using the heat of the exhaust gas. Thereby, the output corresponding to a vehicle output can be obtained reliably.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram of a temperature control structure of a power storage unit, FIG. 2 is a perspective view of the power storage unit, and FIG. 3 is a plan view of a vehicle, where the installation position of the power storage unit is indicated by hatching. The temperature adjustment structure of the power storage device 1 for a vehicle according to the present embodiment is as follows.

  As shown in FIG. 3, the power storage device 1 for a vehicle according to the present embodiment is disposed in a space between a driver seat and a passenger seat, and is installed at a position overlapping the exhaust pipe 2 in plan view. ing.

  An assembled battery (electric storage body) 12 of the power storage device 1 is immersed in a coolant 13 filled in the housing 11, and the housing 11 is fixed to the floor panel 3 of the vehicle. For this reason, when the temperature of the outside air is low, the heat of the coolant 13 is radiated to the outside of the passenger compartment through the floor panel 3, and the temperature of the coolant 13 decreases.

  The assembled battery 12 has an appropriate use temperature. For example, in the case of a lithium ion battery, when the battery temperature exceeds 60 ° C., battery deterioration proceeds, and when the battery temperature is lower than −10 ° C., a battery corresponding to vehicle output. It is thought that no output can be obtained. That is, the battery output corresponding to the vehicle output may not be obtained due to the temperature drop of the coolant 13.

  Therefore, in this embodiment, the temperature of the coolant 13 is raised using the heat of the exhaust gas flowing inside the exhaust pipe 2. Specifically, a turbine blade (driving member) 25 is disposed in the exhaust pipe 2, and heat of the turbine blade 25 heated by the exhaust gas is transmitted to the stirring blade (stirring member) 21 via a torque converter (transmission means) 23. Heat is being transferred. Thereby, the temperature of the coolant 13 is raised so that a battery output corresponding to the vehicle output can be obtained.

  Further, the turbine blade 25 is rotationally driven by coming into contact with the exhaust gas flowing inside the exhaust pipe 2, and this driving force is transmitted to the stirring blade 21 via the torque converter 23 so that the stirring blade 21 can be rotated. . Thereby, it is possible to raise the temperature while suppressing variations in the temperature of the coolant 13.

  Furthermore, since it is not necessary to provide an independent drive source in order to obtain the drive force of the stirring blade 21, the cost can be reduced.

  Next, the structure of each part of the temperature control structure of the power storage device 1 will be described in detail. As shown in FIG. 2, the assembled battery 12 is configured by arranging a plurality of cylindrical unit cells 12b in parallel between a pair of battery folders 12a arranged to face each other. 14 are connected in series.

The unit cell 12b includes carbon (C) such as graphite as a negative electrode active material, lithium using lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), and lithium manganate (LiMn ₂ O ₄ ) as a positive electrode active material. It is an ion battery.

  Here, as the coolant 13, a material having high specific heat, thermal conductivity and high boiling point, which does not corrode the casing 11 and the assembled battery 12 and hardly undergoes thermal decomposition, air oxidation, electrolysis and the like is suitable. Furthermore, in order to prevent a short circuit between the electrode terminals, it must be an electrically insulating liquid.

  For example, a fluorinated inert liquid can be used. As the fluorine-based inert liquid, Fluorinert, Novec HFE (hydrofluorether), and Novec 1230 manufactured by 3M can be used. In addition, a liquid other than the fluorine-based inert liquid (for example, silicon oil) can be used.

  The housing 11 is composed of a housing body 11b whose upper side is open and an upper lid 11a that covers the opening of the housing body 11b, and stainless steel having good heat transfer characteristics can be used. The bottom surface of the housing 11 is in contact with the floor panel 3 of the vehicle so that the heat of the coolant 13 can be dissipated through the floor panel 3. A mounting bracket (not shown) for fixing the housing 11 to the floor panel 3 is provided on the side surface of the housing body 11b.

  A temperature sensor 19 for detecting the temperature of the coolant 13 is provided below the assembled battery 12, and temperature information output from the temperature sensor 19 is input to the battery ECU 16. .

  The exhaust pipe 2 is formed with a main flow path 2A and a sub flow path 2B that once branches from the main flow path 2A and joins, and at the branch point of the main flow path 2A and the sub flow path 2B, an exhaust control slot ( An adjusting mechanism) 26 is provided, and by adjusting the opening of the exhaust adjusting slot 26, the amount of exhaust gas flowing from the main flow path 2A into the sub flow path 2B can be adjusted. The exhaust control slot 26 is electrically connected to a battery ECU (drive control circuit) 16 and is driven based on a drive signal output from the battery ECU 16.

  A turbine blade 25 is disposed in the secondary flow path 2B. A shaft portion 25a of the turbine blade 25 passes through the wall portion of the exhaust pipe 2, and a shaft portion 21a of the stirring blade 21 passes through the upper lid 11a. Yes.

  In the torque converter 23, the AT fluid accommodating portion 23a is filled with AT fluid, and the shaft portion 25a of the turbine member 25 and the shaft portion 21a of the stirring blade 21 extend. A torque fin 23b is attached to the distal end portion of the shaft portion 25a, and a torque fin 23c is attached to the distal end portion of the shaft portion 21a. The pair of torque fins 23b and 23c are spaced apart from each other by a predetermined interval. Opposed.

  According to the above-described configuration, the rotational force of the turbine blade 25 is transmitted to the shaft portion 21a of the stirring blade 21 via the AT fluid filled in the AT fluid accommodating portion 23a, and the stirring blade 21 can be rotated.

  The pair of torque fins 23 b and 23 c decelerate the rotational force of the shaft portion 25 a of the turbine blade 25 and transmit it to the shaft portion 21 a of the stirring blade 21. Thereby, the rotational speed of the stirring blade 21 can be reduced to a speed suitable for stirring.

  A plurality of heat dissipating fins 23d are formed on the outer surface of the AT fluid accommodating portion 23a so as to easily dissipate heat transferred from the turbine blade 25 to the torque converter 23.

  A heat insulating plate 22a is interposed between the AT fluid accommodating portion 23a and the exhaust pipe 2, and a heat insulating plate 22b is interposed between the AT fluid accommodating portion 23a and the upper lid 11a of the housing 11. . These heat insulating plates 22 a and 22 b are made of a material having low thermal conductivity such as resin, and make it difficult to transfer the heat of the turbine blade 25 to the stirring blade 21.

  In this way, by suppressing the heat transfer to the stirring blade 21 using the radiation fins 23d and the heat insulating plates 22a and 22b, the heat of the turbine blade 25 heated to several hundred degrees by the exhaust gas is directly applied to the stirring blade 21. Heat transfer is prevented. Thereby, an excessive temperature rise of the coolant 13 can be suppressed.

  Next, a method for heating the power storage device 1 will be described with reference to FIG. Here, FIG. 4 is a flowchart showing a method for raising the temperature of the power storage device 1. The following flowchart is executed by the battery ECU 16 that monitors the charge / discharge state of the assembled battery 12.

  In the initial state, the exhaust control slot 26 is closed, and the inflow of exhaust gas from the main flow path 2A to the sub flow path 2B is prohibited. The battery ECU 16 constantly monitors the temperature information output from the temperature sensor 19 (step S101), and when the temperature of the coolant 13 falls below −10 ° C. (threshold) (step S102), the exhaust control slot 26 is opened. Operate in the direction (step S103). In this embodiment, the threshold value described in claim 5 is set to −10 ° C., but can be appropriately changed from the viewpoint of the battery temperature necessary to obtain the battery output corresponding to the vehicle output.

  Since the coolant 13 having a low temperature moves downward, the temperature drop of the coolant 13 can be quickly detected by disposing the temperature sensor 19 below the assembled battery 12.

  The temperature of the coolant 13 when operating in the opening direction of the exhaust control slot 26 can be changed as appropriate according to the type of battery.

  When the exhaust control slot 26 operates in the opening direction, the exhaust gas flowing through the main flow path 2A comes into contact with the exhaust control slot 26 and branches into the sub-flow path 2B, and the turbine blade 25 in contact with the branched exhaust gas rotates. .

  At this time, the turbine blade 25 is heated to a temperature of several hundred degrees by the heat of the exhaust gas, and this heat is transferred to the stirring blade 21 via the torque converter 23.

  Further, the rotational force of the turbine blade 25 is transmitted to the shaft portion 21a of the stirring blade 21 via the torque converter 25, and the stirring blade 21 is rotated about the shaft portion 21a as the rotation shaft. Since the cooling liquid 13 is stirred by the rotating action of the stirring blade 21, the temperature of the cooling liquid 13 can be raised while suppressing the variation in temperature.

  Thus, the battery life can be extended by suppressing the variation in the temperature of the coolant 13. Moreover, since the temperature of each single battery 12b rises when the heat of the heated coolant 13 is transferred, a battery output corresponding to the vehicle output can be obtained.

  Furthermore, since the stirring blade 21 is driven using the driving force of the turbine blade 25 driven by exhaust gas, it is not necessary to provide a separate drive source for the stirring blade 21. Thereby, cost can be reduced.

Temperature information output from the temperature sensor 19 is detected (step S104), and the coolant 13
Is raised to 30 ° C. or more (step S105), the exhaust control slot 26 is operated in the closing direction (step S106). Thereby, it is possible to prohibit the exhaust gas from flowing from the main flow path 2A into the sub flow path 2B.

  Although the exhaust operation of the exhaust gas may be hindered by the turbine blade 25 arranged in the sub-flow channel 2B, fuel consumption is improved by adopting a configuration in which the exhaust gas is guided to the sub-flow channel 2B only when the battery needs to be heated. Can be reduced.

  In the configuration of the first embodiment, a cooling unit (for example, a radiator) for cooling the torque converter 23 may be provided. In this case, when the power storage device 1 needs to be cooled, the cooling means may be operated to sufficiently cool the torque converter 23 so that the heat of the turbine blade 25 is not transferred.

  Thereby, the assembled battery 12 can be cooled, suppressing the variation in the temperature of the coolant 13.

Next, the configuration of the temperature adjustment structure of the second embodiment will be described in detail with reference to FIGS. 5 and 6. Parts having the same functions as those in the first embodiment are denoted by the same reference numerals. 5 and 6 are schematic views of the temperature control structure of the power storage device according to the second embodiment. FIG. 5 illustrates a state in which inflow to the sub-channel is prohibited, and FIG. 6 illustrates inflow to the sub-channel. The state which permitted | permitted is shown in figure.

In this embodiment, a magnetic coupling 31 is used in place of the torque converter 23 of the first embodiment. The magnetic coupling 31 is configured by a pair of magnet portions 31 a (first magnetic member) and 31 b (second magnetic member) arranged to face each other, and the magnet portion 31 a is attached to the shaft portion 25 a of the turbine blade 25. The magnet portion 31 b is attached to the shaft portion 21 a of the stirring blade 21.

  The magnet part 31a moves in the axial direction of the turbine blade 25 by operating a clutch mechanism (position changing means) (not shown), and is not in contact with the magnet part 31b (first position) and the magnet part 31b. It moves between a non-contact position (second position) to be in contact. In addition, the structure which moves the magnet part 31b to the axial direction of the turbine blade 25 may be sufficient, and the structure which moves both the magnet parts 31a and 31b to the axial direction of the turbine blade 25 may be sufficient.

  Next, a method for adjusting the temperature of the power storage device 100 will be described with reference to FIG. Here, FIG. 7 is a flowchart illustrating a temperature adjustment method of the power storage device 100. The following flowchart is executed by the battery ECU (first drive control circuit, second drive control circuit) 16. As shown in FIG. 5, in the initial state, the magnet unit 31 is set to the non-contact position, and the exhaust control slot 26 is set to the closed position.

  The battery ECU 16 constantly monitors the temperature information output from the temperature sensor 19 (step S201), and when the temperature of the coolant 13 exceeds 60 ° C. (second threshold) (step S202), the exhaust control slot 26 is set. It operates in the opening direction (step S203).

When the exhaust control slot 26 is operated in the opening direction, the exhaust gas flowing through the main flow path 2A comes into contact with the exhaust control slot 26 and branches into the sub flow path 2B, and the turbine contacts with the exhaust gas branched into the sub flow path 2B. The blade 25 rotates.

  At this time, an air layer is formed between the pair of magnet portions 31a and 31b (see FIG. 5), and the heat of the turbine blade 25 heated by the exhaust gas is transferred to the stirring blade 21 by this air layer. (That is, the stirring blade 21 is not heated).

By rotating the stirring blade 21, the coolant 13 is stirred, and heat dissipation can be promoted while suppressing variations in the temperature of the coolant 13. Thus, according to the present embodiment, the stirring blade 21 can be rotated using the driving force of the turbine blade 25 driven by the exhaust gas.

  Thereby, it is not necessary to provide a separate drive source for the stirring blade 21, and the drive cost can be reduced.

  After the stirring blade 21 starts rotating, the temperature of the coolant 13 is measured (step S204), and when the temperature of the coolant 13 drops to 60 ° C. or less (step S205), the exhaust control slot 26 is closed. Operate in the direction. Thereby, the inflow of the exhaust gas to the sub-flow channel 2B is prohibited, and the rotating operation of the turbine blade 25 and the stirring blade 21 is prohibited.

  Next, when it is determined in step S202 that the temperature of the coolant 13 is 60 ° C. or lower, it is further determined whether or not the temperature of the coolant 13 is less than −10 ° C. (first threshold) ( Step S207) When the temperature is less than −10 ° C., the exhaust control slot 26 is operated in the opening direction, and the clutch mechanism is operated to move the magnetic unit 31a to a contact position where it contacts the magnetic unit 31b (step S207). Step S208).

  Thereby, the rotational force and heat of the turbine blade 25 can be transmitted to the stirring blade 21 via the magnetic coupling 31. As a result, similar to the first embodiment, the temperature of the coolant 13 can be raised while suppressing temperature variation.

Temperature information output from the temperature sensor 19 is detected (step S209), and when it is determined that the temperature of the coolant 13 has risen to 10 ° C. or higher (step S210), the exhaust control slot 26 is closed. While operating, this clutch mechanism is operated and the magnet part 31a is moved to a non-contact position (step S211).

  According to the configuration of the present embodiment, both cooling and heating of the cooling liquid can be performed at low cost.

Next, Example 3 will be described with reference to FIGS. 8 and 9. Here, FIG. 8 is a cross-sectional view of the temperature adjustment (cooling) structure of the power storage device 300, and FIG. 9 is a plan view of the vehicle. In addition, the same code | symbol is attached | subjected to the part which has the same function as Example 1. FIG.

  The power storage device 300 of this embodiment is mounted in the engine room A as shown in FIG. 9, and the turbine member (driving member) 25 is attached to the cylinder of the engine by using the air in the intake pipe 20 that takes in the air. Is driving. The configuration of this embodiment is used only for cooling the assembled battery 12.

The intake pipe 20 is formed with a main flow path 20A and a sub flow path 20B that once branches from the main flow path 20A and joins, and an air adjustment slot ( An adjusting mechanism) 27 is provided, and by adjusting the opening degree of the air adjusting slot 27, the inflow amount of air flowing from the main flow path 20A to the sub flow path 20B can be adjusted.

  Next, a method for cooling the power storage device 200 will be described with reference to FIG. Here, FIG. 10 is a flowchart showing a cooling method of the power storage device 300. The following flowchart is executed by the battery ECU (drive control circuit) 16.

The battery ECU 16 constantly monitors the temperature information output from the temperature sensor (temperature detection means) 19 (step S301), and when the temperature of the coolant 13 exceeds 60 ° C. (threshold) (step S302), the air adjustment slot. 27 is operated in the opening direction (step S303). In this embodiment, the threshold value according to claim 13 is set to 60 ° C., but can be appropriately changed from the viewpoint of battery temperature that promotes the progress of battery deterioration.

When the air adjustment slot 26 is operated in the opening direction, the air flowing through the main flow path 2A comes into contact with the air adjustment slot 27, branches into the sub flow path 2B, and comes into contact with the air branched into the sub flow path 2B. The turbine member (stirring member) 25 rotates.

  The rotational force of the turbine blade 25 is decelerated by the torque converter (transmission means) 23 and transmitted to the stirring blade 21. In the present embodiment, since it is not necessary to cool the torque converter 23, the AT fluid housing portion 23a is not provided with the heat radiating fins 23d.

By rotating the stirring blade 21, the coolant 13 is stirred, and variations in the temperature of the coolant 13 are suppressed, and heat dissipation can be promoted. As described above, according to the present embodiment, the stirring blade 21 is rotated by using the driving force of the turbine blade 25 driven by the air flowing in the intake pipe 20, so that the driving source of the stirring blade 21 is different. There is no need to provide it. Thereby, cost can be reduced.

  After the stirring blade 21 is rotated, the temperature of the coolant 13 is measured (step S304), and when the temperature of the coolant 13 drops to 60 ° C. or less (step S305), the air adjustment slot 26 is closed. Operate. As a result, the inflow of air into the sub-flow channel 2B is prohibited, and the rotating operation of the turbine blade 25 and the stirring blade 21 is stopped (step S306).

Next, the configuration of the power storage device 400 will be described with reference to FIGS. 11 and 12. here,
11 and 12 are schematic views of the temperature control structure of the power storage device. FIG. 11 illustrates a state where the inflow of exhaust gas to the sub-channel 2B is prohibited. FIG. 12 illustrates the exhaust gas in the sub-channel 2B. An inflow state is illustrated. In addition, the same code | symbol is attached | subjected to the component same as Example 1. FIG.

  A first heat transfer member (heat transfer means) 51 that protrudes outside the exhaust pipe 2 is disposed in the sub-flow channel 2B, and a piezoelectric element (heat element) is disposed at the tip of the first heat transfer member 51. (Transmission means) 53 is attached.

Below the piezoelectric element 53, a second heat transfer member (heat transfer means) 52 that extends through the upper lid 11a into the coolant 13 is provided. Note that stainless steel can be used for the first and second heat transfer members 51 and 52.

  An electrode plate (not shown) is provided on the outer surface of the piezoelectric element 53, and the piezoelectric element 53 is deformed by controlling the application of voltage via the conductive wire 54 connected to the electrode plate. The element power supply for the piezoelectric element 53 is not shown.

  FIG. 11 illustrates the piezoelectric element 53 before voltage is applied, and an air layer that suppresses heat transfer is formed between the piezoelectric element 53 and the second heat transfer member 52. FIG. 12 illustrates the piezoelectric element 53 after the voltage is applied, and the piezoelectric element 53 deformed downward and the second heat transfer member 52 are in contact with each other. The application of voltage to the piezoelectric element 53 is controlled by the battery ECU 16.

  A rotating member 55 is provided below the assembled battery 12, and stirring fins 55 a are formed on the outer peripheral surface of the rotating member 55. One end of the rotating shaft 55 b of the stirring member 55 is rotatably supported with respect to a bearing member 57 provided on the inner wall portion of the housing body 11 b, and the other end is connected to the output shaft of the rotating member drive motor 56. ing.

  According to the above-described configuration, when the rotating member drive motor 56 is driven, the stirring fin 55a rotates around the rotation shaft 55b, and the coolant 13 can be stirred.

Next, a method for adjusting the temperature of the power storage device 400 will be described with reference to FIG. Here, FIG. 13 is a flowchart illustrating a method of adjusting the temperature of the power storage device 400. The following flowchart is executed by the battery ECU 16. In the initial state, the inflow of exhaust gas to the sub-flow channel 2B is prohibited, the piezoelectric element 53 is not in contact with the second heat transfer member 52, and the rotating member 55 is stopped.

The battery ECU 16 constantly monitors the temperature information output from the temperature sensor 19 (step S401), and outputs a drive signal to the rotary member drive motor 56 when the temperature of the coolant 13 exceeds 60 ° C. (step S402). (Step S403).

  Thereby, the stirring fin 55a rotates around the rotating shaft 55b, and heat dissipation can be promoted while suppressing variations in the temperature of the coolant 13.

  When the temperature of the coolant 13 drops below 60 ° C. based on the temperature information output from the temperature sensor 19 (step S404) (step S405), the rotating member 55 is stopped (step S406).

  If it is determined in step S406 that the temperature of the coolant 13 is 60 ° C. or lower, it is further determined whether or not the temperature of the coolant 13 is less than −10 ° C. (step S407). Then, the process proceeds to step S408.

  In step S408, the battery ECU 16 outputs an operation signal for operating the exhaust adjustment slot 26 in the opening direction, a drive signal for driving the rotating member drive motor 56, and an instruction signal for instructing application of a voltage to the piezoelectric element 53. The

When the exhaust control slot 26 is operated in the opening direction, the exhaust gas flowing through the main flow path 2A comes into contact with the exhaust control slot 26, branches into the sub flow path 2B, and comes into contact with the exhaust gas branched into the sub flow path 2B. The first heat transfer member 51 is heated.

  When the piezoelectric element 53 extended downward by the application of voltage comes into contact with the second heat transfer member 52, the heat of the first heat transfer member 51 is cooled through the piezoelectric element 53 and the second heat transfer member 52. Heat is transferred to 13, and the temperature of the coolant 13 rises.

  At this time, the rotating member 55 rotates around the rotation shaft 55b, and the cooling liquid 13 is stirred by the stirring action of the stirring fin 55a. Therefore, the temperature of the cooling liquid 13 can be increased while suppressing temperature variation.

  When it is determined that the temperature of the coolant 13 is 10 ° C. or higher based on the temperature information output from the temperature sensor 19 (step S409) (step S410), the process proceeds to step S411, and the exhaust control is performed from the battery ECU 16. An operation signal for operating the slot 26 in the closing direction, a drive stop signal for stopping the driving of the rotating member drive motor 56, and an instruction signal for instructing prohibition of voltage application to the piezoelectric element 53 are output.

  By closing the exhaust control slot 26, the inflow of exhaust gas from the main flow path 2A to the sub flow path 2B is blocked, and the heating operation to the first heat transfer member 51 is prohibited. By prohibiting voltage application to the piezoelectric element 53, the contact between the second heat transfer member 52 and the piezoelectric element 53 is cut off, and an air layer is formed between the piezoelectric element 53 and the second heat transfer member 52. can do. Thereby, it is possible to suppress heat remaining in the first heat transfer member 51 from being transferred to the second heat transfer member 52.

(Other examples)
In the above-described embodiment, the single battery 12b is constituted by a lithium ion battery, but may be a nickel metal hydride battery. Moreover, the assembled battery 12 can also be comprised with a square-shaped battery.

  Furthermore, an electric double layer capacitor can also be used. This electric double layer capacitor is formed by alternately stacking a plurality of positive electrodes and negative electrodes with a separator interposed therebetween. In this electric double layer capacitor, for example, an aluminum foil as a current collector, activated carbon as a positive electrode active material and a negative electrode active material, and a porous film made of polyethylene as a separator can be used.

  As shown in FIG. 14, the power storage device can be arranged in the lower part of the rear seat, in the trunk room. In this case, the heat and the driving force of the stirring blade 21 may be obtained from the turbine blade 25 as in the first and second embodiments, and the thermal energy of the exhaust gas in the exhaust pipe 2 may be used as in the fourth embodiment. Thus, the temperature of the coolant 12 may be raised.

It is the schematic of the temperature control structure of an electrical storage body. It is a perspective view of an electrical storage body. It is a top view of a vehicle and shows the installation position of a power storage device. It is a flowchart which shows the temperature rising method of an electrical storage apparatus. It is the schematic of the temperature control structure of the electrical storage apparatus of Example 2 (state which prohibited the inflow to a subchannel). It is the schematic of the temperature control structure of the electrical storage apparatus of Example 2 (state which permitted the inflow to a subchannel). 6 is a flowchart illustrating a temperature adjustment method for the power storage device according to the second embodiment. 6 is a schematic diagram of a temperature adjustment (cooling) structure of a power storage device of Example 3. FIG. It is a top view of a vehicle, and shows the installation position of a power storage device (Example 3). 6 is a flowchart illustrating a method for cooling a power storage device according to a third embodiment. It is the schematic of the temperature control structure of the electrical storage apparatus of Example 4 (state which prohibited the inflow to a subchannel). It is the schematic of the temperature control structure of the electrical storage apparatus of Example 4 (state which permitted the inflow to a subchannel). 10 is a flowchart illustrating a temperature adjustment method for a power storage device according to a fourth embodiment. It is a top view of vehicles, and shows the installation position of a power storage device (another example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power storage device 2 Exhaust pipe 3 Floor panel 11 Case 12 Battery assembly 13 Coolant 14 Bus bar 16 Battery ECU
DESCRIPTION OF SYMBOLS 19 Temperature sensor 20 Intake pipe 21 Agitation blade 22a 22b Heat insulation plate 23 Torque converter 23a AT fluid accommodating part 23b 23c Torque fin 23d Radiation fin 25 Turbine blade 26 Exhaust adjustment slot 27 Air adjustment slot 31 Magnetic coupling 51 1st heat transfer member 52 Second heat transfer member 53 Piezoelectric element

Claims (15)

A power storage unit for a vehicle;
A coolant for cooling the power storage unit;
A housing for housing the power storage unit and the coolant;
A stirring member for stirring the coolant;
An exhaust pipe for exhausting exhaust gas outside the passenger compartment;
A drive member that rotates by contacting the exhaust gas in the exhaust pipe;
A temperature control structure for a power storage unit, comprising: a transmission unit configured to transmit a rotational force of the driving member to the stirring member.   2. The temperature adjustment structure for a power storage unit according to claim 1, wherein the transmission unit decelerates and transmits the rotational force of the drive member to the stirring member.   The temperature adjusting structure for a power storage unit according to claim 2, wherein the transmission means is a torque converter. The discharge pipe is formed from a main flow path and a sub flow path branched from the main flow path, and the driving member is disposed in the sub flow path,
4. The temperature adjustment structure for a power storage unit according to claim 1, further comprising an adjustment mechanism that adjusts an inflow amount of exhaust gas flowing from the main flow channel into the sub flow channel. 5. Temperature detecting means for detecting the temperature of the coolant;
A drive control circuit for controlling the drive of the adjusting mechanism based on the temperature detected by the temperature detecting means;
The drive control circuit controls the drive of the adjustment mechanism so as to allow inflow of exhaust gas from the main flow path to the sub flow path when the detected temperature is equal to or lower than a threshold value. Item 5. A temperature control structure for a power storage unit according to Item 4. The transmission means includes
A first magnetic member that is rotationally driven together with the drive member;
A second magnetic member that is rotationally driven together with the agitating member and is disposed opposite to the first magnetic member;
2. The temperature adjustment structure of a power storage unit according to claim 1, wherein when the driving member rotates, the stirring member rotates by a magnetic force acting between the first and second magnetic members. The discharge pipe is formed from a main flow path and a sub flow path branched from the main flow path, and the driving member is disposed in the sub flow path,
An adjustment mechanism for adjusting an inflow amount of exhaust gas flowing from the main flow path into the sub flow path;
Between the first position where the first and second magnetic members are in contact and the second position where the first and second magnetic members are not in contact, the first magnetic member and / or Position changing means for changing the position of the second magnetic member;
Temperature detecting means for detecting the temperature of the coolant;
A first drive control circuit for controlling the adjusting mechanism based on the temperature detected by the temperature detecting means;
A second drive control circuit for controlling the position changing means based on the temperature detected by the temperature detecting means;
When the detected temperature is lower than a first threshold value, the first and second drive control circuits are configured to set the first and second magnetic members to the first position in a state where the first and second magnetic members are set to the first position. 7. The temperature adjustment of the electric storage unit according to claim 6, wherein the adjustment mechanism and the position changing unit are controlled so as to allow the inflow of exhaust gas from a path to the sub-flow path to rotate the drive member. Construction.   The first and second drive control circuits move the first and second magnetic members to the second position when the detected temperature is equal to or higher than a second threshold higher than the first threshold. The control mechanism and the position changing means are controlled to rotate the drive member while allowing the exhaust gas to flow from the main flow path to the sub flow path in a state set to The temperature control structure of the electricity storage unit described in 1. A power storage unit for a vehicle;
A coolant for cooling the power storage unit;
A housing for housing the power storage unit and the coolant;
A stirring member for stirring the coolant;
An intake pipe that draws air outside the passenger compartment into the engine;
A drive member disposed in the intake pipe and driven by contacting the air;
A temperature control structure for a power storage unit, comprising: a transmission unit configured to transmit a driving force of the driving member to the stirring member. The temperature adjusting structure for a power storage unit according to claim 9, wherein the transmission means decelerates the rotational force of the drive member and transmits the reduced rotational force to the stirring member.   11. The temperature adjusting structure for a power storage unit according to claim 10, wherein the transmission means is a torque converter. The intake pipe is formed of a main flow path and a sub flow path branched from the main flow path, and the driving member is disposed in the sub flow path,
The temperature adjustment structure for a power storage unit according to any one of claims 9 to 11, further comprising an adjustment mechanism that adjusts an inflow amount of air flowing from the main flow path into the sub flow path. Temperature detecting means for detecting the temperature of the coolant;
A drive control circuit for controlling the drive of the adjusting mechanism based on the temperature detected by the temperature detecting means;
The drive control circuit controls the drive of the adjusting mechanism so as to allow inflow of air from the main flow path to the sub flow path when the detected temperature is higher than a threshold value. Item 13. A temperature control structure for a power storage unit according to Item 12. A power storage unit for a vehicle;
A coolant for cooling the power storage unit;
A housing for housing the power storage unit and the coolant;
A discharge pipe for discharging exhaust gas outside the passenger compartment;
And a heat transfer means for transferring heat of the exhaust gas in the exhaust pipe to the coolant. The vehicle which has the temperature control structure of the electrical storage body as described in any one of Claims 1 thru | or 14.

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