JP7101449B2 - Vehicle battery cooling system - Google Patents

Description

The present invention relates to a vehicle battery cooling device that cools a battery mounted on a vehicle.

A so-called hybrid vehicle equipped with an internal combustion engine and a motor is equipped with a battery for operating the motor. By operating while the vehicle is running, the battery generates heat. Therefore, a vehicle battery cooling device for cooling the battery is arranged so as to be thermally coupled to the battery. As a conventional technique relating to a vehicle battery cooling device, there is a technique disclosed in Patent Document 1.

The vehicle battery cooling device disclosed in Patent Document 1 includes a cooling member configured by superimposing two plates having irregularities formed therein. A cooling member having irregularities is used as a flow path of the cooling medium, and the cooling medium is passed through the flow path to cool the battery by heat exchange with the cooling medium.

Japanese Unexamined Patent Publication No. 2014-203535

A vehicle battery cooling device as shown in Patent Document 1 is, for example, brazed after stacking two plates. Here, in hybrid vehicles and electric vehicles, a long mileage is required. Therefore, in order to increase the storage capacity, a large number of battery cells are arranged on the vehicle body. Then, in order to cool the entire battery having a large number of battery cells, the plate constituting the vehicle battery cooling device is also increased in size. That is, the vehicle battery cooling device requires a plate member having a large cooling area. When stacking boards with a large area, the boards may be twisted or bent due to the weight of the boards themselves. For this reason, it takes time to accurately align the positions of the plates having a large area, and the time required for manufacturing the vehicle battery cooling device becomes long.

An object of the present invention is to provide a vehicle battery cooling device that can be easily positioned and easily assembled.

In the following description, reference numerals in the accompanying drawings are added in parentheses to facilitate understanding of the present invention, whereby the present invention is not limited to the illustrated form.

According to the present invention, in a vehicle battery cooling device (20; 20A; 20B) provided in contact with a battery (Ba) mounted on a vehicle and cooling the battery (Ba) by a cooling medium flowing inside.
A plate-shaped plate member (21) in which a plurality of holes (21ax, 21ay) are formed, and
A first space having a substantially U-shaped cross section, and the first surface (21b) of the plate member (21) and the first space form a one-sided flow path (R1) of the cooling medium. 1 flow path forming member (30) and
The second surface (21c), which has a second space having a substantially U-shaped cross section and is the back surface of the first surface (21b), and the second space have a two-sided flow path (R2) of the cooling medium. A second flow path forming member (40x, 40y), which forms a
The holes (21ax, 21ay) are a plurality of holes (21ax) belonging to a first hole group formed along the surface of the plate member (21) along the X direction, and the surface of the plate member (21). It belongs to one of a plurality of holes (21ay) belonging to the second hole group formed along the Y direction on the top, and
A plurality of the first flow path forming members (30) are arranged, and the one-sided flow path (R1) belongs to any one of the holes (21ax) belonging to the first hole group and the second hole group. Communicate with any of the holes (21ay),
The second flow path forming member (40x, 40y) belongs to the one-sided second flow path forming member (40x) communicating with the hole (21ax) belonging to the first hole group and the second hole group. Provided is a vehicle battery cooling device comprising a second flow path forming member (40y) on the other side communicating with a hole (21ay).

Preferably, the X direction and the Y direction are parallel to each other.
The number of holes (21ax) belonging to the first hole group and the number of holes (21ay) belonging to the second hole group are equal.
The holes (21ax) belonging to the first hole group are formed at equal intervals, respectively.
The holes (21ay) belonging to the second hole group are formed at equal intervals.

Preferably, the fluid inflow portion (25) arranged so as to face the second space of the one-sided second flow path forming member (40x) and into which the cooling medium flows, and the other-side second flow path forming member (40y). ), Further having a fluid outflow portion (26) arranged so as to face the second space and outflow of the cooling medium.
The first flow path forming member (30) having the shortest flow path length from the fluid inflow section (25) is the fluid outflow section based on the length of the two-sided flow path (R2). The first flow path forming member (30) having the longest flow path length from (26) and the longest flow path length from the fluid inflow section (25) is a flow path from the fluid outflow section (26). The fluid inflow portion (25) and the fluid outflow portion (26) are arranged so that the length is the shortest.

Preferably, the fluid inflow portion (25) and the fluid outflow portion (26) are both configured by holes formed in the plate member (21).

Preferably, the other side second flow path forming member (40y) is connected to an extension portion (50) extending so that the fluid outflow portion (26) is adjacent to the fluid inflow portion (25). Has been done.

Preferably, the one-sided second flow path forming member (40x) is connected to an extension portion (50) extending so that the fluid inflow portion (25) is adjacent to the fluid outflow portion (26). Has been done.

In the present invention, the vehicle battery cooling device is formed by superimposing a first flow path forming member and a second flow path forming member, both of which are formed in a substantially U shape, on a plate member having a hole. .. By superimposing each flow path member on the plate member, each component can be easily positioned. It is possible to provide a vehicle battery cooling device that is easy to position and can be easily assembled.

It is a schematic diagram of the battery cooling system equipped with the vehicle battery cooling device according to the first embodiment. FIG. 3 is an exploded perspective view of the vehicle battery cooling device shown in FIG. 1. FIG. 3 is a plan view of the vehicle battery cooling device shown in FIG. 2. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure explaining the operation of the battery cooling device for a vehicle shown in FIG. It is a top view of the vehicle battery cooling device according to the second embodiment. It is a top view of the vehicle battery cooling device according to the third embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure, Fr indicates the front in the vehicle traveling direction, Rr indicates the rear, Le indicates the left, Ri indicates the right, Up indicates the upper side, and Dn indicates the lower side. It should be noted that the directions in the present specification are shown for convenience, and the installation posture of the battery cooling device of the present invention on the vehicle is not limited to the vehicle traveling direction shown in each figure.
<Example 1>

See FIG. FIG. 1 shows a battery cooling system 10 for cooling a vehicle battery Ba. Hybrid vehicles, electric vehicles, and the like are equipped with a vehicle battery Ba for driving a motor. Since the vehicle battery Ba generates heat when it operates, it is necessary to cool it.

The battery cooling system 10 is arranged along the lower surface of the vehicle battery Ba, and is a vehicle battery cooling device 20 (hereinafter referred to as “cooling device 20”) that cools the vehicle battery Ba by a cooling medium flowing inside. I have. As the cooling medium, for example, water to which an antifreezing agent is added is used. The battery cooling system 10 further includes a fluid cooling unit 12 for cooling a cooling medium whose temperature has risen by heat exchange with a vehicle battery Ba, and a pump 13 for circulating the cooling medium.

In addition to the cooling medium, a part of the refrigerant used for the air conditioner for air-conditioning the interior of the vehicle flows through the fluid cooling unit 12. The cooling medium heated through the cooling device 20 is cooled in the fluid cooling unit 12 by the refrigerant from the air conditioner.

The cooling device 20 can be arranged along any surface such as the upper surface and the side surface in addition to the lower surface of the vehicle battery Ba.

See FIGS. 2 and 3. The cooling device 20 includes a plate-shaped plate member 21 in which a plurality of circular holes 21ax and 21ay are formed, and a first flow path forming member fixed to an upper surface 21b (first surface 21b) of the plate member 21. A fluid composed of 30 and second flow path forming members 40x and 40y fixed to the lower surface 21c (second surface 21c) of the plate member 21 and a hole formed in the plate member 21 into which a low-temperature cooling medium flows. The inflow section 25, the fluid outflow section 26 composed of holes formed in the plate member 21 and outflowing the high-temperature cooling medium, the inflow section connecting member 27 connected to the fluid inflow section 25, and the fluid outflow section 26. It has an outflow portion connecting member 28 and which are connected.

The plate member 21 made of a metal plate has a substantially rectangular shape, and the portions 21d and 21e in which the fluid inflow portion 25 and the fluid outflow portion 26 are formed project from their respective sides. In other words, only the portions necessary for the inflow and outflow of the cooling medium are formed as protruding portions 21d and 21e so as to project from the substantially rectangular portions. The plate member 21 is covered with the first flow path forming member 30 and the second flow path forming member 40x, 40y, and has a plurality of holes 21ax, 21ay through which the cooling medium can pass.

It is preferable that the plate member 21 is made of a metal material that can be brazed. For example, aluminum alloys, copper alloys, stainless alloys and the like are used.

The plate member 21 can be formed by press molding or laser processing, including the formation of holes 21ax, 21ay, fluid inflow portion 25, and fluid outflow portion 26.

The holes 21ax and 21ay are circular holes having the same diameter. The holes 21ax and 21ay can be divided into two groups, a first hole group and a second hole group.

The hole 21ax belonging to the first hole group is formed on the line Lx extending in the X direction on the surface of the plate member 21. In other words, in plan view, the line Lx passes through the center (center of gravity) of the holes 21ax belonging to the first hole group. The holes 21ax belonging to the first hole group are opened at equal intervals so that the intervals between them are t1.

The hole 21ay belonging to the second hole group is formed on the line Ly extending in the Y direction on the surface of the plate member 21. In other words, in plan view, the line Ly passes through the center (center of gravity) of the hole 21ay belonging to the second hole group. The holes 21ay belonging to the second hole group are opened at equal intervals so that the intervals between them are t2.

The line Lx extending in the X direction and the line Ly extending in the Y direction extend parallel to each other and parallel to one side of the rectangular plate member 21. The distance t1 between the holes 21ax belonging to the first hole group is equal to the distance t2 between the holes 21ays belonging to the second hole group. That is, t1 = t2.

The shape of the holes 21ax and 21ay may be a shape other than a circular shape, for example, an elongated hole shape or the like. Further, the shape of each hole may be different. Even in this case, it is preferable that the holes 21ax and 21ay are formed so that the lines Lx and Ly pass through the center (center of gravity) of the holes 21ax and 21ay.

See FIG. Four first flow path forming members 30 are provided in parallel with each other in a direction orthogonal to one side of the plate member 21. The same member is used for the first flow path forming member 30, and the first flow path forming member 30 is fixed to the plate member 21 by, for example, brazing.

The first flow path forming member 30 is formed of, for example, an aluminum alloy, a copper alloy, a stainless alloy, or the like. In order to ensure brazing property, a metal of the same series as the plate member 21 is selected as the material of the first flow path forming member 30.

The first flow path forming member 30 covers the hole 21ax belonging to the first hole group and the hole 21ay belonging to the second hole group one by one.

See FIG. Each of the first flow path forming members 30 has a first space having a substantially U-shaped cross section, and the upper surface 21b of the plate member 21 and the first space form a one-sided flow path R1 of the cooling medium.

The first flow path forming member 30 may be arranged diagonally instead of in a direction orthogonal to the plate member 21 depending on the position where the holes 21ax and 21ay are formed (not shown). Each hole of the hole 21ax belonging to the first hole group and each hole of the hole 21ay belonging to the second hole group are arranged so as to cover the same number (for example, one by one) while ensuring airtightness. It suffices if it has been done.

See FIGS. 3 and 5. The second flow path forming members 40x and 40y have a second space having a substantially U-shaped cross section, and the second surface 21c and the second space form a two-sided flow path R2 of the cooling medium. The second flow path forming members 40x and 40y are fixed to the plate member 21 by, for example, brazing.

The second flow path forming members 40x and 40y are formed of, for example, an aluminum alloy, a copper alloy, a stainless alloy, or the like. In order to ensure brazing property, a metal of the same series as the plate member 21 is selected as the material of the second flow path forming members 40x and 40y.

Two second flow path forming members 40x and 40y are provided parallel to one side of the plate member 21 and parallel to each other.

The second flow path forming members 40x and 40y may be arranged diagonally instead of in a direction orthogonal to the plate member 21 depending on the position where the holes 21ax and 21ay are formed (not shown). .. Each hole of the hole 21ax belonging to the first hole group may be arranged so as to cover each hole while ensuring airtightness. Alternatively, each hole of the hole 21ay belonging to the second hole group may be arranged so as to cover each hole while ensuring airtightness.

The second flow path forming members 40x and 40y are the one-sided second flow path forming member 40x communicating with the hole 21ax belonging to the first hole group and the fluid inflow portion 25, and the hole 21ay and the fluid belonging to the second hole group. It has a second flow path forming member 40y on the other side communicating with the outflow portion 26.

The one-side second flow path forming member 40x covers all of the holes 21ax belonging to the first hole group and the fluid inflow portion 25, and the other side second flow path forming member 40y belongs to the second hole group. It covers all of the holes 21ay and the fluid outflow portion 26.

The fluid inflow portion 25 is formed in the protruding portion 21d by a round hole and faces the second space of the second flow path forming member 40x on one side. The fluid inflow portion 25 is formed on the line Lx extending in the X direction. In plan view, the line Lx passes through the center of the fluid inflow portion 25.

The fluid outflow portion 26 is formed in the protruding portion 21e by a round hole and faces the second space of the second flow path forming member 40y on the other side. The fluid outflow portion 26 is formed on a line Ly extending in the Y direction. In plan view, the line Ly passes through the center of the fluid outflow portion 26.

The operation of the cooling device 20 will be described.

See FIG. The cooling medium cooled in the fluid cooling unit 12 is sent to the cooling device 20.

See FIG. FIG. 6 shows a cooling device 20 from which the inflow portion connecting member 27 (see FIG. 3) and the outflow portion connecting member 28 (see FIG. 3) are removed for convenience of explanation. The cooling medium flows from the fluid inflow portion 25 into the two-sided flow path R2 formed by the one-side second flow path forming member 40x. A part of the cooling medium flowing through the two-sided flow path R2 branches at the branch point P1, and the first flow path forming member 30-1 (-1 is a subscript for identifying the first flow path forming member 30). Hereinafter, it flows through the one-sided flow path R1 formed by the same in FIG. 6). Similarly, the cooling medium is branched into the first flow path forming members 30-2 to 30-4, and flows through the one-sided flow path R1 formed by each.

A high-temperature battery Ba (see FIG. 1) is placed on the upper surfaces of the first flow path forming members 30-1 to 30-4 so as to be thermally coupled. The cooling medium passing through the one-sided flow path R1 cools the battery Ba via the first flow path forming members 30-1 to 30-4. That is, heat exchange is performed. The cooling medium heated by the heat of the battery Ba flows into the two-sided flow path R2 formed by the other side second flow path forming member 40y, and joins at the merging portion P2. The combined cooling medium flows out from the fluid outflow portion 26.

See FIG. The cooling medium that has passed through the fluid outflow section 26 and has flowed out of the outflow section connecting member 28 is sent to the fluid cooling section 12, cooled, and sent to the cooling device 20 again.

By the way, the first flow path forming member 30-1 having the shortest flow path length from the fluid inflow section 25 has the longest flow path length from the fluid outflow section 26. On the other hand, the first flow path forming member 30-4 having the longest flow path length from the fluid inflow section 25 has the shortest flow path length from the fluid outflow section 26. In other words, the positions of the fluid inflow section 25 and the fluid outflow section 26 are such that the first flow path forming member 30-1 having the shortest flow path length from the fluid inflow section 25 has a flow path length to the fluid outflow section 26. The first flow path forming member 30-4, which is the longest and has the longest flow path length from the fluid inflow section 25, is set so that the flow path length to the fluid outflow section 26 is the shortest.

The flow path length of the cooling medium that flows in from the fluid inflow section 25 and flows out from the fluid outflow section 26 is the same regardless of whether the cooling medium has passed through any of the first flow path forming members 30-1 to 30-4.

The cooling device 20 described above has the following effects.

See FIG. The cooling device 20 is formed by superimposing a first flow path forming member 30 and a second flow path forming member 40x, 40y, both of which are formed in a substantially U shape, on a plate member 21 having holes 21ax and 21ay. .. By superimposing the flow path forming members 30, 40x, and 40y on the plate member 21, the positioning of each component can be easily performed. It is possible to provide a vehicle battery cooling device that is easy to position and can be easily assembled.

In addition, the first flow path forming member 30 communicates with either the hole 21ax belonging to the first hole group and the hole 21ay belonging to the second hole group. The second flow path forming member 40x, 40y communicates with the one-sided second flow path forming member 40x communicating with the hole 21ax belonging to the first hole group and the other side communicating with the hole 21ay belonging to the second hole group. It has a second flow path forming member 40y. A plurality of one-sided flow paths R1 formed by a plurality of arranged first flow path forming members 30 by using the one-side second flow path forming member 40x, 40y and the other side second flow path forming member 40x, 40y. (See FIG. 6), the cooling medium can be distributed and recovered.

The X direction and the Y direction are parallel, and the number of holes 21ax belonging to the first hole group and the number of holes 21ay belonging to the second hole group are equal to each other. Further, the holes 21ax belonging to the first hole group are formed at equal intervals (t1), and the holes 21ay belonging to the second hole group are formed at equal intervals (t2), respectively. As a result, the plurality of first flow path forming members 30 can each be composed of the same parts, and the one side second flow path forming members 40x and 40y and the other side second flow path forming members 40x and 40y are also the same parts. Can be configured with. It is possible to improve the efficiency of the assembly work by standardizing the parts and suppressing the assembly of the flow path forming members 30, 40x and 40y to the wrong positions.

See FIG. The first flow path forming member 30-1 having the shortest flow path length from the fluid inflow section 25 has the longest flow path length from the fluid outflow section 26 and the longest flow path length from the fluid inflow section 25. In the 1 flow path forming member 30-4, the fluid inflow section 25 and the fluid outflow section 26 are arranged so that the flow path length from the fluid outflow section 26 is the shortest. The cooling medium flowing in from the fluid inflow section 25 passes through the one-side second flow path forming member 40x, the first flow path forming member 30, and the other side second flow path forming member 40y, and flows out from the fluid outflow section 26. Even when a plurality of first flow path forming members 30 are arranged, the length of each flow path from the fluid inflow section 25 to the fluid outflow section 26 is made equal, and the amount of cooling medium flowing in each flow path is equalized. Can be evened out. It is desirable because the entire vehicle battery Ba (see FIG. 1) can be efficiently cooled.

Both the fluid inflow portion 25 and the fluid outflow portion 26 are composed of holes formed in the plate member 21. The fluid inflow portion 25 and the fluid outflow portion 26 can be formed by press working or laser machining together with the holes 21ax and 21ay forming a part of the flow path. The number of steps required for processing can be reduced, and the vehicle battery cooling device 20 can be made inexpensive.

<Example 2>
Next, the cooling device 20A according to the second embodiment will be described with reference to the drawings.

See FIG. 7. In the cooling device 20A according to the second embodiment, the cooling device 20 according to the first embodiment (see FIG. 3) is further provided with an extension portion 50. Other basic configurations are the same as those of the cooling device according to the first embodiment. For the parts common to the first embodiment, reference numerals are used and detailed description thereof will be omitted.

The extension portion 50 extends in a direction orthogonal to the first member 51 connected to the other side second flow path forming member 40y and extending in parallel with the first flow path forming member 30 and the end portion of the first member 51. It has a second member 52 and.

The outflow portion connecting member 28 faces the end of the second member 52. The outflow portion connecting member 28 is provided adjacent to the inflow portion connecting member 27. That is, the fluid outflow portion is formed at a position adjacent to the fluid inflow portion.

Also in the cooling device 20A according to the second embodiment, when the flow path length of the cooling medium flowing in from the inflow portion connecting member 27 and flowing out from the outflow portion connecting member 28 passes through any of the first flow path forming members 30. But it is the same.

The vehicle battery cooling device 20A described above also has the predetermined effect of the present invention.

In addition, an extension portion 50 that extends the fluid outflow portion 26 so as to be adjacent to the fluid inflow portion 25 is connected to the second flow path forming member 40y on the other side. The fluid inflow section 25 and the fluid outflow section 26 can be brought close to each other, and for example, the connection structure of the pipe for connecting to the fluid cooling section 12 (see FIG. 1) can be made compact.

The same effect is obtained when the flow of the cooling medium is reversed, the extension portion 50 is extended from the fluid inflow portion, and the fluid inflow portion is arranged in the vicinity of the fluid outflow portion. That is, the extension portion 50 that extends so that the fluid inflow portion is adjacent to the fluid outflow portion may be connected to the second flow path forming member on one side. Also in this case, the connection structure of the piping of the vehicle battery cooling device 20A can be made compact.

<Example 3>
Next, the cooling device 20B according to the third embodiment will be described with reference to the drawings.

See FIG. In the cooling device 20B according to the third embodiment, the fluid introduction portion (inflow portion connecting member 27) and the fluid outflow portion (outflow portion connecting member 28) are formed on the same side of the plate member 21. Other basic configurations are common to the cooling devices 20 and 20A according to the first and / or second embodiments. For the parts common to the first and / or the second embodiment, the reference numerals are used and detailed description thereof will be omitted.

In the cooling device 20B, the flow path length differs depending on the first flow path forming member 30 passing through. In this case, a large amount of fluid flows through the first flow path forming member 30 (the first flow path forming member 30 at the bottom of the drawing), which has the shortest flow path length. When a part of the battery Ba (see FIG. 1) becomes particularly hot, a larger amount of fluid can flow by shortening the flow path length of the first flow path forming member 30 that abuts on such a portion. Can be done. As a result, the battery Ba can be efficiently cooled.

On the other hand, it is also possible to make the sizes of the holes 21ax and 21ay different so that the fluid can flow uniformly through the one-sided flow path R1 configured by each first flow path forming member 30. For example, the opening area of the holes 21ax and 21ay in the portion where the flow path length is long may be formed to be relatively larger than the opening area of the holes 21ax and 21ay in the portion where the flow path length is short.

The cooling device 20B described above also has the predetermined effect of the present invention.

In the cooling device 20B, a fluid inflow portion (inflow portion connecting member 27) and a fluid outflow portion (outflow portion connecting member 28) are formed on the same side of the plate member 21 having a substantially rectangular plate shape. Therefore, the fluid inflow portion and the fluid outflow portion can be formed in close proximity to each other without providing the extension portion 50 (see FIG. 7).

The items described in each embodiment can be combined as appropriate. Further, the present invention is not limited to the examples as long as the actions and effects of the present invention are exhibited.

The vehicle battery cooling device of the present invention is suitable for mounting on a hybrid vehicle.

20, 20A, 20B ... Vehicle battery cooling device 21 ... Plate member, 21ax ... Hole belonging to the first hole group, 21ay ... Hole belonging to the second hole group, 21b ... Top surface (first surface), 21c ... Bottom surface (Second side)
25 ... Fluid inflow part 26 ... Fluid outflow part 30 ... First flow path forming member 40x ... One side second flow path forming member, 40y ... Other side second flow path forming member Lx ... Line extending in the X direction, Ly ... Y Line extending in the direction R1 ... 1-sided flow path R2 ... 2-sided flow path Ba ... Vehicle battery

Claims (6)

In a vehicle battery cooling device (20; 20A; 20B) provided in contact with a battery (Ba) mounted on a vehicle and cooling the battery (Ba) by a cooling medium flowing inside.
A plate-shaped plate member (21) in which a plurality of holes (21ax, 21ay) are formed, and
A first space having a substantially U-shaped cross section, and the first surface (21b) of the plate member (21) and the first space form a one-sided flow path (R1) of the cooling medium. 1 flow path forming member (30) and
The second surface (21c), which has a second space having a substantially U-shaped cross section and is the back surface of the first surface (21b), and the second space have a two-sided flow path (R2) of the cooling medium. A second flow path forming member (40x, 40y), which forms a
The holes (21ax, 21ay) are a plurality of holes (21ax) belonging to a first hole group formed along the surface of the plate member (21) along the X direction, and the surface of the plate member (21). It belongs to one of a plurality of holes (21ay) belonging to the second hole group formed along the Y direction on the top, and
A plurality of the first flow path forming members (30) are arranged, and the one-sided flow path (R1) belongs to any one of the holes (21ax) belonging to the first hole group and the second hole group. Communicate with any of the holes (21ay),
The second flow path forming member (40x, 40y) belongs to the one-sided second flow path forming member (40x) communicating with the hole (21ax) belonging to the first hole group and the second hole group. A vehicle battery cooling device comprising a second flow path forming member (40y) on the other side communicating with a hole (21ay). The X direction and the Y direction are parallel to each other.
The number of holes (21ax) belonging to the first hole group and the number of holes (21ay) belonging to the second hole group are equal.
The holes (21ax) belonging to the first hole group are formed at equal intervals, respectively.
The vehicle battery cooling device according to claim 1, wherein the holes (21ay) belonging to the second hole group are formed at equal intervals. A fluid inflow portion (25) arranged so as to face the second space of the one-sided second flow path forming member (40x) and into which the cooling medium flows, and a second of the other-side second flow path forming member (40y). It further has a fluid outflow portion (26) arranged so as to face the two spaces and from which the cooling medium flows out.
The first flow path forming member (30) having the shortest flow path length from the fluid inflow section (25) is the fluid outflow section based on the length of the two-sided flow path (R2). The first flow path forming member (30) having the longest flow path length from (26) and the longest flow path length from the fluid inflow section (25) is a flow path from the fluid outflow section (26). The vehicle battery cooling device according to claim 2, wherein the fluid inflow portion (25) and the fluid outflow portion (26) are arranged so that the length is the shortest. The vehicle battery cooling device according to claim 3, wherein the fluid inflow portion (25) and the fluid outflow portion (26) are both configured by holes formed in the plate member (21). An extension portion (50) extending so that the fluid outflow portion (26) is adjacent to the fluid inflow portion (25) is connected to the second flow path forming member (40y) on the other side. The vehicle battery device according to claim 3 or 4. An extension portion (50) extending so that the fluid inflow portion (25) is adjacent to the fluid outflow portion (26) is connected to the one-side second flow path forming member (40x). The vehicle battery device according to claim 3 or 4.

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