JP2015107728A - Electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric vehicle which adjusts an amount of a coolant according to an amount of heat generated by a battery and electric devices and thereby properly conducts cooling.SOLUTION: A coolant is branched by a branch part 11 to flow into a first battery unit 31 and a second battery unit 32 and circulates in first and second circulation passages A, B. The coolant of the first circulation passage A circulates in a first electric device case 40 after passing through the first battery unit 31. The coolant of the second circulation passage B circulates in a second electric device case 41 after passing through the second battery unit 32. Flow quantity adjustment means which adjusts flow quantity of the coolant circulating through the first and second circulation passages A, B is disposed in the branch part 11.

Description

  The present invention relates to an electric vehicle such as an electric vehicle or a hybrid vehicle.

  Patent Document 1 discloses an invention related to a drive system for driving a motor, and particularly to an automobile equipped with a drive system having a cooling mechanism. This drive system includes a battery, a PCU, a heat exchanger, a water pump, and piping. The pipe connects the battery, the PCU, and the heat exchanger in a loop shape. The water pump is inserted into a pipe between the heat exchanger and the battery. The heat exchanger cools the cooling water by heat exchange between the refrigerant (first refrigerant) from the air conditioner unit and the cooling water (second refrigerant) circulating in the pipe. The water pump circulates the cooling water cooled by the heat exchanger in the piping in the order of the battery and the PCU, thereby cooling the battery and the PCU.

JP 2005-12890 A

  By the way, in the automobile described in Patent Document 2, the cooling water cooled by the heat exchanger is circulated in the piping in the order of the battery and the PCU to cool the battery and the PCU. The PDU includes a plurality of inverters, converters, and the like. Equipped with electrical equipment. Therefore, when the calorific values of the plurality of electric devices are different, it has been difficult to appropriately cool them according to the target temperature of each electric device.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electric vehicle capable of appropriately cooling by adjusting the amount of cooling water in accordance with the amount of heat generated by a battery or an electric device.

In order to achieve the above object, the invention described in claim 1
A battery unit (for example, first and second battery units 31 and 32 in an embodiment described later) for storing a battery;
An electric device case (for example, in an embodiment described later) that houses an electric device including a first electric device (for example, a DC-DC converter 36 in an embodiment described later) and a second electric device (for example, a charging device 37 in an embodiment described later). First and second electrical equipment cases 40, 41);
With
Common cooling water that cools the battery and the electric device flows through the inside of a cooling water pipe (for example, a cooling water pipe 10 in an embodiment described later) disposed in the battery unit and the electric device case,
The battery unit includes a first battery unit (for example, a first battery unit 31 in an embodiment described later) and a second battery unit (for example, a second battery unit 32 in an embodiment described later),
The electric device case includes a first electric device case (for example, a first electric device case 40 in an embodiment described later) that houses the first electric device, and a second electric device case (for example, a first electric device case 40 that accommodates the second electric device). A second electrical equipment case 41) in an embodiment described later,
The cooling water is branched into the first battery unit and the second battery unit by a branching section (for example, a branching section 11 in an embodiment described later), and the first and second flow paths (for example, the first in the embodiment described later). 1 and the second distribution channel A, B),
The cooling water in the first distribution path circulates in the first electric device case after passing through the first battery unit,
The cooling water of the second distribution path circulates in the second electric equipment case after passing through the second battery unit,
The branch portion is provided with a flow rate adjusting means for adjusting the flow rate of the cooling water flowing through the first and second flow paths.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the flow rate adjusting means changes a cross-sectional area of the cooling water pipe through which the cooling water of the first and second flow paths flows. Thus, the flow rate of the cooling water is adjusted.

In addition to the structure of Claim 1 or 2, the invention of Claim 3 is
The calorific value of the first electric device is less than the calorific value of the second electric device,
The flow rate of the cooling water in the first flow path is smaller than the flow rate of the cooling water in the second flow path.

In addition to the structure described in any one of claims 1 to 3, the invention described in claim 4
The second battery unit is disposed behind the first battery unit,
The first battery unit is disposed in the vehicle front-rear direction,
The second battery unit is arranged in the vehicle left-right direction,
The cooling water piping toward the second battery unit is disposed on one side surface of the first battery unit in the vehicle left-right direction so as to extend in the vehicle front-rear direction.

In addition to the structure of Claim 4, the invention of Claim 5 is
An exhaust pipe (for example, an exhaust pipe 7 in an embodiment described later) connected to the internal combustion engine (for example, an internal combustion engine 3 in an embodiment described later) is arranged in the vehicle longitudinal direction on the other side surface in the vehicle lateral direction of the first battery unit. It is arrange | positioned so that it may extend.

In addition to the structure of Claim 5, the invention of Claim 6 is
The cooling water piping toward the second battery unit is disposed below the cooling water piping from the second battery unit.

In addition to the structure of any one of Claims 4-6, the invention of Claim 7 is
The electric vehicle includes a pair of first seats (for example, a front seat 5 in an embodiment described later) arranged side by side in the vehicle left-right direction, and a second seat (for example, an embodiment described later) disposed behind the first seat. A rear seat 6) in the form,
The first battery unit is disposed between a pair of the first sheets,
The second battery unit is disposed below the second seat,
The first and second electrical device cases are respectively disposed on the left and right sides of the first battery unit, and are disposed below the pair of first sheets.

In addition to the structure of Claim 3, the invention of Claim 8 is
The first electric device is a DC-DC converter (for example, a DC-DC converter 36 in an embodiment described later) that steps down the voltage of DC power supplied from the first and second battery units.
The second electrical device is a charging device (for example, a charging device 37 in an embodiment described later) that converts AC power supplied from an external power source and charges the first and second battery units. .

In addition to the structure of Claim 5, the invention of Claim 9 is
The first and second battery units, and the first and second electric devices are arranged below a floor panel (for example, a floor panel 21 in an embodiment described later).
It is characterized by that.

  According to the first aspect of the present invention, the circuit of the cooling water for cooling the battery and the electric device includes the first distribution path for distributing the first electric device case after passing through the first battery unit, and the second battery unit. It is set as the parallel circuit which consists of the 2nd distribution channel which distribute | circulates a 2nd electric equipment case after passage. Thereby, the amount of cooling water required for each of the first and second flow paths can be adjusted, and a group having a larger amount of heat generation can be actively cooled.

  According to the second aspect of the present invention, the flow rate can be adjusted with a simple structure, and the cost can be suppressed without causing a significant increase in weight.

  According to the third aspect of the present invention, a large amount of cooling water is circulated through a group having a large calorific value, whereby the cooling efficiency is improved and the reliability of the electrical equipment can be ensured.

  According to the fourth aspect of the present invention, the cooling water pipe can be easily routed to the second unit, and the pressure loss can be reduced by the straight pipe.

  According to the fifth aspect of the present invention, the cooling water pipe and the exhaust pipe are arranged on both the left and right sides of the vehicle with the first battery unit interposed therebetween, so the cooling water pipe is arranged at a position where the heat influence from the exhaust pipe is small. It is possible to improve the cooling efficiency.

  According to the sixth aspect of the present invention, after cooling the second battery unit, the cooling water pipe (return pipe) through which the cooling water whose water temperature has increased flows through the cooling water pipe (cooling water before cooling the second battery unit). By disposing above the circulating cooling water pipe (supply pipe), it is possible to suppress the influence of exhaust heat from the return pipe and improve the thermal efficiency.

  According to the seventh aspect of the present invention, the first and second battery units and the first and second electric equipment cases are efficiently arranged, so that the first and the second passenger equipment cases are not affected without affecting the posture of the occupant or the luggage space. In addition, the second battery unit and the first and second electric equipment cases can be arranged, and the cooling water pipe can be short-circuited and compactly piped, so that the cooling water pipe can be easily routed.

  According to the eighth aspect of the present invention, since the charging device generates a larger amount of heat than the DC-DC converter, the flow rate of the cooling water in the second flow path for cooling the charging device is cooled by the DC-DC converter. More than the flow rate of the cooling water in the first flow path is set. Thereby, since a charging device is actively cooled, cooling efficiency improves and it can ensure the reliability of an electric equipment.

  According to the ninth aspect of the present invention, the first and second battery units in which the cooling water pipes are disposed and the front and rear electric devices are configured as one unit, and the unit is integrally mounted under the floor panel. Easy to do.

1 is a plan view showing a schematic configuration of a hybrid vehicle that is an embodiment of an electric vehicle according to the present invention. 1 is a side view showing a schematic configuration of a hybrid vehicle which is an embodiment of an electric vehicle according to the present invention. It is a perspective view of the unit which consists of a 1st and 2nd battery unit and a front and back electric equipment. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a figure for demonstrating the cooling water circuit for cooling a battery and an electric equipment. It is a figure for demonstrating the cooling water circuit for cooling a battery and an electric equipment.

  First, an embodiment of an electric vehicle according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, an electric vehicle 1 according to the present invention is a hybrid vehicle having a front wheel drive device 2 connected to an internal combustion engine 3 and an electric motor 4 at the front of the vehicle. Is transmitted to the front wheels Wf via a transmission (not shown). The rear wheel Wr functions as a driven wheel. As will be described later, the electric motor 4 is electrically connected to the batteries accommodated in the first and second battery units 31 and 32, and can supply power from the batteries and regenerate energy to the batteries. The exhaust pipe 7 connected to the internal combustion engine 3 is arranged on the right side in the traveling direction of the electric vehicle 1 so as to extend in the vehicle front-rear direction.

  In addition, the electric vehicle 1 includes a pair of front seats 5 (first seats) arranged side by side in the vehicle left-right direction and a rear seat 6 (second seat) arranged behind the front seats 5. Of the pair of front seats 5, one (the vehicle traveling direction right side) is a driver's seat and the other (the vehicle traveling direction left side) is a passenger seat.

(Battery and electrical equipment arrangement)
With reference also to FIG. 3, the arrangement of the battery and the electric device of the present embodiment will be described in detail. The electric vehicle 1 according to the present embodiment includes, as components related to the power source, the first and second battery units 31 and 32 as energy sources, and the first and second battery units 31 and 32 are rapidly charged from an external charging station. A quick charging connector (not shown) used when charging is performed, and a plug-in connector (not shown) used when charging the first and second battery units 31 and 32 from the outlet of a residential AC power source. A charging device 37 of a high-frequency AC-DC converter for converting the plug-in connector into the first and second battery units 31, 32 by converting the alternating current of the AC power source for residential use into direct current, and the first and second A DC-DC converter 3 connected to the battery units 31 and 32 to convert a high voltage into a low voltage and supply necessary power to each subsystem or the like It has a, and.

  A first battery unit 31 is disposed between the pair of front seats 5 in the vehicle front-rear direction, and a second battery unit 32 is disposed in the vehicle left-right direction behind the first battery unit 31 and below the rear seat 6. Is done. The first and second battery units 31 and 32 are formed by aligning a plurality of battery unit pieces 33 that house batteries therein in different directions.

  More specifically, the battery unit piece 33 has a substantially rectangular parallelepiped shape, and the first battery unit 31 includes four battery unit pieces 33 in two upper and lower stages so that their long sides are parallel to the vehicle front-rear direction. Two pieces are arranged in one row on the left and right. The second battery unit 32 is formed by arranging eight battery unit pieces 33 so that their long sides are parallel to the left-right direction of the vehicle. The rear battery unit group 34 is configured, and the front row includes the front battery unit group 35 including the four battery unit pieces 33 in two upper and lower stages. In this way, the second battery unit 32 is arranged so that the front battery unit group 35 is higher than the rear battery unit group 34 so as to follow the seat surface shape of the rear seat 6 that is inclined forward and therefore upward. Thus, the vehicle interior space is secured without greatly changing the seating surface position (hip point) of the rear seat 6. Note that the first and second battery units 31 and 32 are both composed of two upper and lower battery unit pieces 33, so that the heights thereof are substantially the same.

  On the right side in the vehicle traveling direction of the first battery unit 31, below the front seat 5 (driver's seat), a DC-DC converter 36 that increases the voltage of DC power supplied from the first and second battery units 31 and 32. (First electric device) is arranged. Further, on the left side in the vehicle traveling direction of the first battery unit 31, below the front seat 5 (passenger seat), the AC power supplied from the external power source is converted into DC power or the DC power supplied from the external power source. A charging device 37 (second electric device) that converts the electric power and charges the first and second battery units 31 and 32 is disposed. The DC-DC converter 36 and the charging device 37 constitute a front electric device and are accommodated in first and second electric device cases 40 and 41, respectively. The charging device 37 includes an AC-DC converter (not shown), and the AC-DC converter uses the AC voltage supplied from the power outlet as a direct current necessary for charging the first and second battery units 31 and 32. Convert to voltage.

  Between the first battery unit 31 and the second battery unit 32 in the front-rear direction, a rear junction box 38 as a rear electric device is disposed. The rear junction box 38 distributes power between the first and second battery units 31 and 32 and the front electrical device (the DC-DC converter 36 and the charging device 37). That is, the rear junction box 38 distributes the electric power converted by the charging device 37 to the first and second battery units 31 and 32, and the DC power of the first and second battery units 31 and 32 is DC−. Power is distributed to the DC converter 36.

  The DC power distributed to the DC-DC converter 36 is stepped down and supplied to an auxiliary battery (not shown). The DC-DC converter 36 includes a front junction box FrJ / B, and the DC power of the first and second battery units 31 and 32 distributed by the front junction box FrJ / B is not illustrated. Distributes power to the power drive unit (PDU). The power drive unit then converts the DC power into AC power and drives the motor 4.

  Here, since the DC-DC converter 36 and the charging device 37 (front electric device) are lower than the rear junction box 38 (rear electric device), even if the DC-DC converter 36 and the charging device 37 (front electric device) are arranged below the pair of front seats 5, Arrangement can be made without greatly changing the surface position, and sufficient interior space can be secured. The front junction box FrJ / B included in the DC-DC converter 36 has a function of distributing power between the rear junction box 38 and a power drive unit (not shown), whereas the rear junction box 38 Since it has a plurality of functions of distributing power between the first and second battery units 31, 32, the DC-DC converter 36, and the charging device 37, the rear junction box 38 compared to the front junction box FrJ / B. Becomes higher. In general, the DC-DC converter 36 and the charging device 37 are formed lower than the first and second battery units 31 and 32.

  The first and second battery units 31, 32, the front electric device (DC-DC converter 36 and the charging device 37), and the rear electric device (rear junction box 38) can be loaded and unloaded from above. The seen shape is fixed to the upper surface of the base 8 having a earthen shape, and constitutes a single unit 20 covered with the base 8 and a sealed cover (not shown). The shape of the cover is an uneven shape that follows the shape of the upper surface of the unit 20. Then, as shown in FIGS. 4 to 7, the unit 20 is disposed below the floor panel 21. The shape of the floor panel 21 is also an uneven shape that follows the shape of the upper surface of the unit 20.

  As described above, according to the arrangement of the battery and the electric device of the present embodiment, the first battery unit 31 is arranged between the pair of front seats 5, and the second battery unit 32 is arranged below the rear seat 6. The front electrical device (the DC-DC converter 36 and the charging device 37) is disposed below the pair of front seats 5, and the rear electrical device (rear junction box 38) is interposed between the first and second battery units 31 and 32. Be placed. Thus, by efficiently arranging the battery unit and the electric device, the battery unit and the electric device can be arranged without affecting the posture of the occupant and the luggage space. Further, by changing the placement of the first and second battery units 31 and 32 with respect to the space between the front floor portion and the rear floor portion, the first and second batteries can be used effectively while using these spaces. Since the units 31 and 32 can be efficiently arranged, as many batteries as possible can be mounted. In general, the DC-DC converter 36 and the charging device 37 that constitute the front electric device do not require a height as compared with the first and second battery units 31 and 32. Therefore, the height of the front seat 5 is increased. The front electrical device can be arranged below the front seat 5 without greatly changing.

  In addition, the DC-DC converter 36 and the charging device 37 that constitute the forward electric device, which is a relatively heavy component, are arranged under the pair of front seats 5 arranged in the left-right direction of the vehicle, thereby balancing the center of gravity of the entire vehicle. This can be obtained well, and in particular, a preferable front-rear weight balance of the electric vehicle 1 can be obtained. In addition, since the DC-DC converter 36 and the charging device 37 can be relatively low in height, the footing property under the pair of front seats 5 is not deteriorated. This makes it possible to secure a sufficient vehicle interior space.

  In addition, since the rear junction box 38 is disposed between the first battery unit 31 and the second battery unit 32, the high-voltage wiring from the first and second battery units 31 and 32 can be short-circuited and routed. It becomes easy.

  Further, since the front electrical devices (the DC-DC converter 36 and the charging device 37) are lower than the rear electrical devices (rear junction box 38), a relatively low front electrical device is disposed below the pair of front seats 5 for comparison. By disposing a relatively high rear electrical device between the first and second battery units 31, 32, the height of the front seat 5 and the rear seat 6, that is, the seat surface position (hip point) can be arranged without greatly changing, A sufficient interior space can be secured. Thereby, it is possible to secure the seat seat surface and the overhead space within the limit of the total vehicle height.

  Since the first and second battery units 31, 32, the front electric device (DC-DC converter 36 and the charging device 37) and the rear electric device (rear junction box 38) are arranged below the floor panel 21, these Is configured as a single unit 20, and the unit 20 can be easily mounted under the floor panel 21.

  The second battery unit 32 includes two or more front and rear battery unit groups 35 and 34 having different heights in the front and rear, and the front battery unit group 35 is higher than the rear battery unit group 34. Therefore, by arranging the second battery unit 32 disposed below the rear seat 6 along the seat surface shape of the rear seat 6, it can be disposed without greatly changing the height of the rear seat 6, that is, the seat surface position. A sufficient interior space can be secured. Thereby, it is possible to secure the seat seat surface and the overhead space within the limit of the total vehicle height.

(About the structure of the cooling water circuit)
Next, a cooling water circuit for cooling such a battery and electric equipment (DC-DC converter 36, charging device 37) will be described. In general, the cooling water flows from the battery to the electric equipment in order, and the electric equipment includes the charging device 37 (AC-DC converter) that has a large output and a large calorific value with respect to the DC-DC converter 36. There is a need to efficiently cool batteries and electrical equipment.

  As shown in FIG. 3, a cooling water pipe 10 is disposed on the side surfaces of the first and second battery units 31 and 32 and the first and second electric equipment cases 40 and 41, and the inside of the cooling water pipe 10 The common water coolant for cooling the battery and the electric device is circulated by the electric water pump 14 (see FIG. 9).

  The upstream end of the cooling water pipe 10 connected to the electric water pump 14 is disposed on the left side in the vehicle traveling direction of the first battery unit 31 so as to extend in the vehicle front-rear direction. That is, the cooling water pipe 10 is disposed on one side surface of the first battery unit 31 in the vehicle left-right direction. On the other hand, the exhaust pipe 7 (see FIG. 1) of the internal combustion engine 3 is disposed on the other side surface of the first battery unit 31 in the left-right direction of the vehicle. Is suppressed. Similarly, the charging device 37 that generates a larger amount of heat than the DC-DC converter 36 is also arranged on one side surface of the first battery unit 31 in the left-right direction of the vehicle, so that the thermal influence from the exhaust pipe 7 can be suppressed. .

  Also referring to FIGS. 8 and 9, the cooling water pipe 10 includes a first flow path A disposed in the first battery unit 31 by the branching portion 11 and a second flow path disposed in the second battery unit 32. Branching into the distribution path B, two cooling water circuits are formed. In the figure, a part of the first distribution route A is represented by (A and any number), a part of the second distribution route B is represented by (B and any number), and the first and second distribution routes A, A part of the third distribution path C before branching to B and after the first and second distribution paths A and B merge is represented by (C and any number).

  The branch portion 11 is provided with a flow rate adjusting means for adjusting the flow rate of the cooling water flowing through the first and second flow paths A and B, and the flow rate of the cooling water in the first flow path A is the second flow path. The flow rate is set to be smaller than the flow rate of the cooling water in the path B. More specifically, the flow rate adjusting means cools the cross-sectional area of the cooling water pipe 10 of the first flow path A by changing it so as to be smaller than the cross-sectional area of the cooling water pipe 10 of the second flow path B. The water flow is adjusted. Here, the change of the cross-sectional area of the cooling water pipe 10 may be performed by changing the diameter of the cooling water pipe 10 itself, or by adding an orifice having the same pipe diameter. 8 and 9 indicates the cross-sectional area of the cooling water pipe 10, that is, the flow rate of the cooling water.

  Of the cooling water in the distribution path (C1), the cooling water in the distribution path (A1) branched to the first distribution path A is first of all the four battery unit pieces 33 constituting the first battery unit 31. The two battery unit pieces 33A located in the upper part are cooled, and then the two battery unit pieces 33B located in the upper stage are cooled.

  The cooling water in the flow path (A2) that has passed through the first battery unit 31 flows through the first electric device case 40 and cools the DC-DC converter 36 accommodated therein. Thereafter, the cooling water in the distribution path (A3) merges with the cooling water in the distribution path (B4) as described later.

  In addition, among the cooling water in the distribution path (C 1), the cooling water in the distribution path (B 1) branched to the second distribution path B flows backward toward the second battery unit 32. Here, as shown in FIG. 3, the cooling water pipe 10 is arranged on the left side of the first battery unit 31 in the vehicle left-right direction so as to extend linearly in the vehicle front-rear direction, and the second battery unit 32. The cooling water pipe 10 is easily routed to the pipe and the pressure loss is reduced by the straight pipe.

  And the cooling water piping 10 is distribute | circulated by the other branch part 12 by the two battery unit pieces 33C located in the upper stage among the eight battery unit pieces 33 which comprise the 2nd battery unit 32. The route is branched into a route (B2-1) and a distribution route (B2-2) disposed in the six battery unit pieces 33D, 33E, and 33F located in the lower stage. Here, out of the six battery unit pieces 33 located in the lower stage, two located in the front are represented as 33D, two located in the middle are represented as 33E, and two located in the rear are represented as 33F.

  Here, the branch part 12 is provided with a flow rate adjusting means for adjusting the flow rate of the cooling water in the same manner as the branch part 11 described above, and the cooling water of the flow path (B2-1) and the flow path (B2-2). Adjust so that the flow rates are approximately equal. That is, the cross-sectional area of the cooling water pipe 10 of the distribution path (B2-1) and the distribution path (B2-2) is one half of the cross-sectional area of the cooling water pipe 10 of the distribution path (B1).

  And the cooling water of a distribution channel (B2-1) cools two battery unit pieces 33C. Moreover, the cooling water of a distribution path (B2-2) cools in order from a back group among three sets (six) of battery unit pieces 33F, 33E, and 33D. And the cooling water of a distribution channel (B2-1) and a distribution channel (B2-2) merges mutually (refer (B3) in a figure), and cools the charging device 37. FIG.

  As described above, the distribution path (B1) is branched into the distribution path (B2-1) and the distribution path (B2-2) by the branching unit 12 in each battery unit (first and second battery units 31, 32). ) Of the battery unit pieces 33A and 33B of the first battery unit 31, the amount of cooling water of the battery unit piece 33C located in the upper stage of the second battery unit 32, and the second battery. In order to match the cooling water amount of the battery unit pieces 33D, 33E, and 33F located in the lower stage of the unit 32 and reduce the temperature difference between the battery units, the branching section 12 causes the distribution path (B2-1) and the distribution path ( It was branched to B2-2).

  For example, when the amount of cooling water in the distribution path (C1) is 3x (x is an arbitrary number), the amount of cooling water in the distribution path (A1) is 1x, and the amount of cooling water in the distribution path (B1) is 2x, the distribution path The amount of cooling water in (B2-1) and the distribution channel (B2-2) is 1x. The amount of cooling water for cooling the first and second battery units 31 and 32 and the DC-DC converter 36 is 1x, and the amount of cooling water for cooling the charging device 37 is 2x. In this case, the charging device 37 having a larger calorific value than the DC-DC converter 36 and requiring cooling can be sufficiently cooled, and a plurality of battery unit pieces 33 constituting the first and second battery units 31 and 32 can be obtained. Can be cooled equally. Note that the ratio of the cooling water amount between the distribution path (A1) and the distribution path (B1) is not limited to the above example, and the distribution path (A1) is determined by the branch unit 11 according to the state of the DC-DC converter 36 and the charging device 37. ) And the amount of cooling water to the distribution channel (B1) may be appropriately changed. In addition, the amount of cooling water supplied from the electric water pump 14 to the flow path (C1) is also appropriately changed according to the state of the battery or the electric device.

  The cooling water in the distribution path (B4) that has cooled the charging device 37 merges with the cooling water in the distribution path (A3) that has cooled the DC-DC converter 36, but the distribution path (B4) compared to the distribution path (A3). Therefore, there is a possibility that a reverse flow of the cooling water occurs in the first flow path A. Therefore, the one-way valve 13 is disposed in the cooling water pipe 10 of the distribution path (A2) to prevent the cooling water from flowing back to the first battery unit 31. Note that the one-way valve 13 may be arranged in the flow path (A3).

  The cooling water merged from the first and second flow paths A and B flows through the cooling water pipe 10 of the flow path (C2). As shown in FIG. 3, the cooling water pipe 10 from the second battery unit 32 is disposed above the cooling water pipe 10 that forms the flow path (C1) and goes to the second battery unit 32. As a result, the cooling water pipe 10 (return pipe) of the distribution path (C2) through which the cooling water whose temperature has risen flows after the cooling of the battery and the electric equipment is passed through the cooling water before the cooling of the battery and the electric equipment. By disposing the cooling water pipe 10 (supply pipe) in the circulation path (C1) that circulates, it is possible to suppress the influence of exhaust heat from the return pipe and improve the thermal efficiency.

  Then, the cooling water in the distribution channel (C2) is lowered to an appropriate water temperature by the radiator 15, and then supplied again to the distribution channel (C1) by the electric water pump 14.

  As described above, according to the configuration of the cooling water circuit of the present embodiment, the first flow path A that flows through the first electric device case 40 after passing through the first battery unit 31 and the second battery unit 32 pass through. It is set as the parallel circuit which consists of the 2nd distribution path B which distribute | circulates the 2nd electric equipment case 41 later. Thereby, the amount of cooling water required for each of the first and second distribution paths A and B can be adjusted, and a group having a larger calorific value (in the present embodiment, the second battery unit 32 and the charging device 37) is positive. Can be cooled.

  Further, the flow rate adjusting means of the branching section 11 is simple because the flow rate of the cooling water is adjusted by changing the cross-sectional area of the cooling water pipe 10 through which the cooling water of the first and second flow paths A and B flows. The flow rate can be adjusted with a simple structure, and the cost can be suppressed without causing a significant increase in weight.

  Further, the heat generation amount of the DC-DC converter 36 is smaller than the heat generation amount of the charging device 37, and the flow rate of the cooling water in the first flow path A is smaller than the flow rate of the cooling water in the second flow path B. By flowing a large amount of cooling water through a group with a large amount of heat generation, the cooling efficiency is improved and the reliability of the electrical equipment can be ensured.

  Further, the cooling water pipe 10 toward the second battery unit 32 is disposed on the left side in the vehicle left-right direction of the first battery unit 31 so as to extend linearly in the vehicle front-rear direction, so that the second battery unit The cooling water pipe 10 can be easily routed to 32, and the pressure loss is reduced by the straight pipe.

  Further, since the cooling water pipe 10 and the exhaust pipe 7 are arranged on both the left and right sides of the vehicle with the first battery unit 31 in between, the cooling water pipe 10 can be arranged at a position where there is little heat influence from the exhaust pipe, and cooling efficiency is improved. Can be improved

  In addition, the cooling water pipe 10 (return pipe) of the distribution path (C2) through which the cooling water whose temperature has risen circulates after cooling of the battery and the electric equipment, and the cooling water before the cooling of the battery and the electric equipment circulates. Since it arrange | positions above the cooling water piping 10 (supply piping) of the distribution channel (C1) to perform, it is possible to suppress the influence of the exhaust heat from a return piping, and to improve thermal efficiency.

  The electric vehicle 1 includes a pair of front seats 5 arranged side by side in the vehicle left-right direction and a rear seat 6 arranged behind the front seat 5, and the first battery unit 31 includes a pair of front seats 5. The second battery unit 32 is disposed below the rear seat 6, the first and second electric device cases 40 and 41 are disposed on the left and right of the first battery unit 31, respectively, and a pair of front It is arranged below the sheet 5. Therefore, by arranging the first and second battery units 31 and 32 and the first and second electric device cases 40 and 41 efficiently, the first and second battery units are not affected without affecting the posture of the occupant or the luggage space. Since the battery units 31 and 32 and the first and second electric device cases 40 and 41 can be arranged and the cooling water pipe 10 can be short-circuited and compactly piped, the cooling water pipe 10 can be easily routed.

  Further, since the charging device 37 generates a larger amount of heat than the DC-DC converter 36, the flow rate of the cooling water in the second distribution path B that cools the charging device 37 is set to the first distribution path that cools the DC-DC converter 36. It is set more than the flow rate of the cooling water of A. Thereby, since the charging device 37 is actively cooled, the cooling efficiency is improved, and the reliability of the electric device can be ensured.

  The first and second battery units 31 and 32, the front electric devices (DC-DC converter 36 and the charging device 37) and the rear electric device (rear junction box 38) in which the cooling water pipe 10 is disposed are a floor panel. Since these are arranged under the unit 21, they are configured as one unit 20, and the unit 20 can be easily mounted under the floor panel 21 (see FIGS. 3 to 7).

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  For example, in the above-described embodiment, a hybrid vehicle has been described as an electric vehicle to which the present invention is applied. However, the present invention is not limited to this, and may be, for example, a biographical vehicle using only the electric motor 4 as a drive source.

  Further, the second battery unit 32 may be composed of three or more battery unit groups having different heights in the front and rear directions. In this case, the front battery unit group is higher than the rear battery unit group. Composed. Even in this case, the height of the rear seat 6, that is, the seating surface position is greatly changed by arranging the second battery unit 32 arranged below the rear seat 6 along the seating surface shape of the rear seat 6. It can be arranged without any problem, and a sufficient vehicle interior space can be secured.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Front-wheel drive device 3 Internal combustion engine 4 Electric motor 5 Front seat (1st seat)
6 Rear seat (second seat)
7 Exhaust pipe 8 Base 10 Cooling water cooling pipe 11 (branch part)
12 branching portion 13 one-way valve 14 electric water pump 15 radiator 20 unit 21 floor panel 31 first battery unit 32 second battery unit 33 battery unit piece 34 rear battery unit group (battery unit group)
35 Front battery unit group (battery unit group)
36 DC-DC converter (front electrical equipment, first electrical equipment)
37 Charging device (front electrical equipment, second electrical equipment)
38 Rear junction box (rear electrical equipment)
39 Front junction box 40 First electric equipment case 41 Second electric equipment case Wf Front wheel Wr Rear wheel

Claims (9)

A battery unit for housing the battery;
An electrical device case that houses an electrical device comprising the first electrical device and the second electrical device;
With
Common cooling water that cools the battery and the electric device flows through the inside of the cooling water pipe disposed in the battery unit and the electric device case,
The battery unit has a first battery unit and a second battery unit,
The electrical device case has a first electrical device case that houses the first electrical device, and a second electrical device case that houses the second electrical device,
The cooling water is branched into the first battery unit and the second battery unit by a branching portion and flows through the first and second flow paths (* 1 to 2 and 12),
The cooling water in the first distribution path circulates in the first electric device case after passing through the first battery unit,
The cooling water of the second distribution path circulates in the second electric equipment case after passing through the second battery unit,
The electric vehicle according to claim 1, wherein a flow rate adjusting means for adjusting a flow rate of the cooling water flowing through the first and second flow paths is disposed at the branch portion. The flow rate adjusting means adjusts the flow rate of the cooling water by changing a cross-sectional area of the cooling water pipe through which the cooling water flows in the first and second flow paths. The electric vehicle as described in. The calorific value of the first electric device is less than the calorific value of the second electric device,
The electric vehicle according to claim 1, wherein a flow rate of the cooling water in the first flow path is smaller than a flow rate of the cooling water in the second flow path. The second battery unit is disposed behind the first battery unit,
The first battery unit is disposed in the vehicle front-rear direction,
The second battery unit is arranged in the vehicle left-right direction,
The said cooling water piping toward the said 2nd battery unit is arrange | positioned so that it may extend in the vehicle front-back direction at the one side surface side in the vehicle left-right direction of the said 1st battery unit. The electric vehicle according to claim 1. The electric vehicle according to claim 4, wherein an exhaust pipe connected to the internal combustion engine is disposed on the other side surface of the first battery unit in the vehicle left-right direction so as to extend in the vehicle front-rear direction. 6. The electric vehicle according to claim 5, wherein the cooling water pipe toward the second battery unit is disposed below the cooling water pipe from the second battery unit. The electric vehicle includes a pair of first seats arranged side by side in the vehicle left-right direction, and a second seat arranged behind the first seat,
The first battery unit is disposed between a pair of the first sheets,
The second battery unit is disposed below the second seat,
The said 1st and 2nd electric equipment case is each arrange | positioned at the left and right of the said 1st battery unit, and is arrange | positioned under a pair of said 1st sheet | seat, The any one of Claims 4-6 characterized by the above-mentioned. The electric vehicle according to item 1. The first electric device is a DC-DC converter that steps down a voltage of DC power supplied from the first and second battery units,
The electric vehicle according to claim 3, wherein the second electric device is a charging device that converts AC power supplied from an external power source to charge the first and second battery units. The electric vehicle according to claim 5, wherein the first and second battery units and the first and second electric devices are arranged below a floor panel.

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