Battery Cooler

Abstract

The utility model relates to a battery cooler for cooling a battery mounted on a vehicle, and comprises: a first main flow path, into which a refrigerant flowing from an inflow portion flows; a second main flow path, into which a refrigerant flowing in the second main flow path flows to an outflow portion for the refrigerant to flow out; and a secondary flow path, which is arranged between the first main flow path and the second main flow path, is connected to the first main flow path and the second main flow path, and into which a refrigerant flowing from the first main flow path into the secondary flow path flows to the second main flow path. A plurality of secondary flow paths are arranged between the first main flow path and the second main flow path, and each secondary flow path reciprocates at least once between the first main flow path and the second main flow path. The secondary flow path farthest from the inflow portion is configured as follows: one end is connected to the end on the downstream side in the flow direction of the refrigerant in the first main flow path; and / or the other end is connected to the end on the upstream side in the flow direction of the refrigerant in the second main flow path. As a result, the refrigerant will not be stagnant and the battery can be efficiently cooled.

Description

Technical Field

[0001] The utility model relates to a battery cooler. Background Art

[0002] Patent document 1 discloses a cooling component for cooling a battery module mounted on a vehicle. The cooling component has a fastening plate mounted on the top or bottom of a battery module or a battery pack. The fastening plate is a hollow structure for the flow of refrigerant, and refrigerant is supplied from the main passage through a branch passage from one side of the fastening plate to the hollow portion. The refrigerant supplied to the hollow portion is discharged from the other side of the fastening plate through the branch passage to the main passage.

[0003] Patent Document 1: Japanese Patent Application No. 2014-509441

[0004] As shown in the drawing of Patent Document 1, the main passage through which the coolant passes has a portion extending further than the branch passage. If the end of this portion is closed and the heated coolant stays in this portion, the temperature of the battery module around this portion is difficult to decrease. Utility Model Content

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently cool a battery without stagnating a refrigerant.

[0006] The battery cooler of the utility model is a battery cooler for cooling a battery mounted on a vehicle, and comprises: a first main flow path, into which the refrigerant flowing in from an inflow portion flows; a second main flow path, into which the refrigerant flowing in the second main flow path flows to an outflow portion for the refrigerant to flow out; and a secondary flow path, which is arranged between the first main flow path and the second main flow path, is connected to the first main flow path and the second main flow path, and the refrigerant flowing in the secondary flow path from the first main flow path flows to the second main flow path. A plurality of secondary flow paths are arranged between the first main flow path and the second main flow path, and each of the secondary flow paths reciprocates at least once between the first main flow path and the second main flow path. The secondary flow path farthest from the inflow portion is configured as follows: one end is connected to the end of the downstream side in the flow direction of the refrigerant in the first main flow path; and / or the other end is connected to the end of the upstream side in the flow direction of the refrigerant in the second main flow path.

[0007] This prevents the coolant from stagnating in the flow path through which the coolant flows, and enables the battery to be cooled efficiently.

[0008] In addition, the battery cooler may be configured such that the secondary flow path reciprocates in the width direction of the battery cooler, and at least a portion of the secondary flow path farthest from the inflow portion is formed to an end portion in the width direction of the battery cooler.

[0009] This allows the battery to be cooled to the ends in the width direction.

[0010] Furthermore, in the battery cooler, the secondary flow path farthest from the inflow portion may be branched between the first primary flow path and the second primary flow path, and reciprocate between the first primary flow path and the second primary flow path at least once.

[0011] This increases the length of the secondary flow path, and can expand the cooling area for the battery.

[0012] The battery cooler of the utility model achieves the effect of realizing that the refrigerant does not accumulate and the battery can be cooled efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective exploded view of a battery pack according to an embodiment.

[0014] Figure 2 It is a top view of a battery cooler according to an embodiment.

[0015] Figure 3 It is a cross-sectional view along the XY plane of the battery cooler according to the embodiment.

[0016] Figure 4A This is a schematic diagram of the first secondary flow path.

[0017] Figure 4B This is a schematic diagram of the second secondary flow path.

[0018] Figure 5 It is a schematic diagram of a modification example of the second auxiliary flow path.

[0019] Fig. 6A It is a schematic diagram of a modification example of the second auxiliary flow path.

[0020] Figure 6B It is a schematic diagram of a modification of the second auxiliary flow path. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention in detail according to the accompanying drawings. In addition, the present invention is not limited to the implementation described below. In addition, it should be noted that the accompanying drawings are schematic diagrams, which are sometimes different from reality. Sometimes, the accompanying drawings contain parts with different size relationships or proportions. In addition, the orthogonal coordinate system of the X-axis, Y-axis and Z-axis is appropriately shown in the figure for illustrating the direction. In the space shown in the orthogonal coordinate system, the direction in which the X component increases is called the +X direction, and the direction in which the X component decreases is called the -X direction. Similarly, for the Y and Z components, they are also defined as the +Y direction, -Y direction, +Z direction, and -Z direction. In addition, for the convenience of explanation, the +Z direction is sometimes referred to as the top, the -Z direction is referred to as the bottom, and the Z-axis direction is referred to as the up and down direction.

[0022] Figure 1 This is a perspective exploded view of a battery pack 1 according to an embodiment of the present invention. The battery pack 1 includes a housing 10, a plurality of battery stacks 20, a battery cooler 30, and a sharing plate 40. The battery pack 1 is used as a power source in vehicles that run on electricity, such as electric vehicles (BEVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fuel cell vehicles (FCEVs).

[0023] Each of the plurality of battery stacks 20 includes a plurality of battery cells 21 arranged in a predetermined arrangement direction (X-axis direction). The battery stack 20 is configured as a plurality of battery cells 21 electrically connected in series and modularized. In addition, the X-axis direction in which the battery cells 21 are arranged in one battery stack 20 is parallel to, for example, the width direction of the vehicle when the battery pack 1 is mounted on the vehicle. The battery cell 21 is, for example, a secondary battery capable of charging and discharging, such as a nickel-hydrogen battery or a lithium-ion battery having a flat rectangular shell. In addition, the battery cell 21 may be a battery cell using a liquid electrolyte or a battery cell using a solid electrolyte. In addition, the battery cell 21 may also be a unit capacitor configured to store electricity. The plurality of battery stacks 20 are arranged in a direction (Y-axis direction) orthogonal to the arrangement direction of the battery cells 21. The Y-axis direction in which the plurality of battery stacks 20 are arranged is parallel to, for example, the front-rear direction of the vehicle when the battery pack 1 is mounted on the vehicle.

[0024] The shell 10 is a shell that accommodates and protects multiple battery stacks 20. The shell 10 is composed of an upper shell 11 and a lower shell 12. The upper shell 11 is a box-shaped shape that is open to the bottom and is formed of a resin material. In addition, the material forming the upper shell 11 is not limited to a resin material, and a metal material can also be used. The lower shell 12 is a box-shaped shape that is open to the top and is formed of a metal material. In addition, in order to dissipate heat from the multiple battery cells 21, the material of the lower shell 12 is preferably a metal with high thermal conductivity.

[0025] A plurality of heat conductors 13 are arranged on the bottom surface 14 on the inner side of the lower shell 12 in a manner parallel to the X-axis direction. The heat conductor 13 is formed of a resin material having thermal conductivity. As the material of the heat conductor 13, for example, silicone resin, acrylic resin, polyurethane resin or epoxy resin can be used. The heat conductor 13 is arranged in such a way that a heat conductor 13 in contact with the lower surface of the battery stack 20 is provided for one battery stack 20. In addition, the heat conductor 13 may also have a bonding function to bond and fix the battery stack 20 to the bottom surface 14. By covering the upper shell 11 on the lower shell 12 on which the plurality of battery stacks 20 are arranged, the plurality of battery stacks 20 are accommodated in the shell 10.

[0026] The battery cooler 30 is a device that absorbs the heat of multiple battery cells 21 to cool the battery cells 21. The battery cooler 30 is configured to contact the lower surface of the lower shell 12. The battery cooler 30 is formed of, for example, aluminum with high thermal conductivity. In addition, the material of the battery cooler 30 is not limited to aluminum, and may also be other metals with high thermal conductivity. The battery cooler 30 has an inlet portion 31 and an outlet portion 32 on the side surface on the -Y direction side, and a flow path for the flow of a refrigerant for cooling the battery cells 21 is provided inside. The flow path is connected to the inlet portion 31 and the outflow portion 32, and the refrigerant introduced into the flow path from the inlet portion 31 circulates inside the battery cooler 30 to cool the multiple battery cells 21, and is then discharged from the outflow portion 32. The detailed structure of the battery cooler 30 will be described later.

[0027] The sharing plate 40 is disposed below the battery cooler 30. The sharing plate 40 is a member for protecting the battery cooler 30 and is formed of a metal material.

[0028] Figure 2 3 is a top view of the battery cooler 30 according to the embodiment. The battery cooler 30 includes a first main flow path portion 33, a second main flow path portion 34, a plurality of first cooling portions 35A, a second cooling portion 35B, a guide portion 36, and a convex portion 37. A flow path for the refrigerant to flow is formed inside the first main flow path portion 33, the second main flow path portion 34, a plurality of first cooling portions 35A, the second cooling portion 35B, the guide portion 36, and the convex portion 37.

[0029] The guide portion 36 is formed parallel to the X-axis direction at the end of the battery cooler 30 in the -Y direction. A convex portion 37 is provided on the side surface of the guide portion 36 in the -Y direction. The convex portion 37 has an inflow portion 31 and an outflow portion 32 and protrudes from the guide portion 36 to the -Y direction. The first main flow path portion 33 is formed along the Y-axis direction at the end of the battery cooler 30 in the -X direction. The second main flow path portion 34 is formed parallel to the Y-axis direction at the end of the battery cooler 30 in the +X direction.

[0030] A plurality of first cooling sections 35A are formed between the first main flow path section 33 and the second main flow path section 34. The plurality of first cooling sections 35A are connected to the first main flow path section 33 and the second main flow path section 34, and are arranged in parallel with the X-axis direction at intervals in the Y-axis direction. One first cooling section 35A is arranged corresponding to one battery stack 20. If a plurality of battery stacks 20 are arranged in the lower shell 12, one battery stack 20 is located above one first cooling section 35A. The second cooling section 35B is formed at the end of the battery cooler 30 in the +Y direction between the first main flow path section 33 and the second main flow path section 34. The second cooling section 35B is connected to the first main flow path section 33 and the second main flow path section 34, and is arranged in parallel with the X-axis direction at intervals from the first cooling section 35A on the +Y direction side. If a plurality of battery stacks 20 are arranged in the lower shell 12, the battery stack 20 arranged closest to the +Y direction is located above the second cooling section 35B.

[0031] Figure 3 : is a cross-sectional view of the battery cooler 30 along the XY plane. Inside the battery cooler 30, as flow paths for the flow of refrigerant, a first flow path 301, a second flow path 302, a first main flow path 303, a second main flow path 304, a first sub-flow path 305, and a second sub-flow path 306 are formed. The refrigerant supplied to the inflow portion 31 flows from the first flow path 301 to the first main flow path 303. The refrigerant flowing to the first main flow path 303 flows to the second main flow path 304 through the plurality of first sub-flow paths 305 and the second sub-flow paths 306. The refrigerant in the second main flow path 304 flows to the second flow path 302 and is discharged from the outflow portion 32.

[0032] The first flow path 301 is formed inside the guide portion 36. The first flow path 301 is formed parallel to the X-axis direction and connects the inlet portion 31 and the first main flow path 303. The refrigerant supplied to the inlet portion 31 flows toward the first main flow path 303 through the first flow path 301.

[0033] The first main flow path 303 is a flow path formed inside the first main flow path portion 33. The first main flow path 303 is formed parallel to the Y-axis direction at the end portion in the -X direction of the battery cooler 30, and is connected to a plurality of first sub-flow paths 305 and a second sub-flow path 306. The refrigerant flowing in the first main flow path 303 flows toward the plurality of first sub-flow paths 305 and the second sub-flow paths 306.

[0034] Figure 4A Schematic diagram of the first secondary flow path 305. Figure 4A The arrows shown indicate the direction of refrigerant flow. The first auxiliary flow path 305 is formed inside the first cooling section 35A. Each of the plurality of first auxiliary flow paths 305 is connected to the first main flow path 303 and the second main flow path 304. The first auxiliary flow path 305 has sub-flow paths 305a to 305c. The sub-flow path 305a is formed parallel to the X-axis direction and is connected to the first main flow path 303. The refrigerant flowing in the first main flow path 303 branches and flows into the sub-flow path 305a. The end of the sub-flow path 305a in the +X direction branches and is connected to two sub-flow paths 305b. The two sub-flow paths 305b are formed in parallel to the X-axis direction and at a predetermined interval in the Y-axis direction. The refrigerant flowing in the sub-flow path 305a branches and flows into the two sub-flow paths 305b. The two sub-flow paths 305c are formed in parallel to the X-axis and at a predetermined interval in the Y-axis direction. The sub-flow path 305 c is connected to the sub-flow path 305 b and the second main flow path 304 . The refrigerant flowing in the sub-flow path 305 b flows into the sub-flow path 305 c , and the refrigerant flowing in the sub-flow path 305 c flows toward the second main flow path 304 .

[0035] Figure 4B It is a schematic diagram of the second auxiliary flow path 306. Figure 4BThe arrows shown indicate the direction of refrigerant flow. The second secondary flow path 306 is formed inside the second cooling section 35B. The second secondary flow path 306 is connected to the first main flow path 303 and the second main flow path 304. The second secondary flow path 306 has sub-flow paths 306a to 306e. The sub-flow path 306a of the second secondary flow path 306 is formed parallel to the X-axis direction and is connected to the end of the first main flow path 303 in the +Y direction, that is, the end of the first main flow path 303. The refrigerant flowing to the end in the +Y direction in the first main flow path 303 flows toward the sub-flow path 306a. The end in the +X direction of the sub-flow path 306a branches and is connected to the sub-flow path 306b and the sub-flow path 306d. Sub-flow path 306b is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306a in the -Y direction, and sub-flow path 306d is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306a in the +Y direction. In addition, sub-flow path 306d is formed to the end of the battery cooler 30 in the -X direction, that is, the end of the battery cooler 30 in the width direction. The refrigerant flowing in sub-flow path 306a is branched and flows to sub-flow path 306b and sub-flow path 306d. Sub-flow path 306c is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306b in the -Y direction. Sub-flow path 306c is connected to sub-flow path 306b and the second main flow path 304. The refrigerant flowing in sub-flow path 306b flows into sub-flow path 306c, and the refrigerant flowing in sub-flow path 306c flows to the second main flow path 304. Sub-flow path 306e is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306d in the +Y direction. In addition, sub-flow path 306c is formed to the end of the battery cooler 30 in the X-axis direction, that is, the end of the battery cooler 30 in the width direction. Sub-flow path 306e is connected to the end of sub-flow path 306d and the second main flow path 304 in the +Y direction. The refrigerant flowing in sub-flow path 306d flows into sub-flow path 306e, and the refrigerant flowing in sub-flow path 306e flows to the second main flow path 304.

[0036] The second main flow path 304 is formed parallel to the Y-axis direction at the end of the battery cooler 30 in the +X direction. The second main flow path 304 is formed to the end of the battery cooler 30 in the +Y direction, and is connected to the first sub-flow path 305 and the second sub-flow path 306. In addition, the second main flow path 304 is also connected to the second flow path 302. The refrigerant flowing in the second main flow path 304 is discharged from the outflow portion 32 through the second flow path 302.

[0037] In the present embodiment, in the first main flow path 303, the end on the downstream side in the flow direction of the refrigerant flow is not a blind path, but is connected to the sub-flow path 306a. As a result, the refrigerant flows without stagnation inside the battery cooler 30, so the temperature difference of the part where the refrigerant is present in the battery cooler 30 can be reduced, and the battery cell 21 can be efficiently cooled. In addition, in the present embodiment, since the temperature difference of the refrigerant inside the battery cooler 30 is reduced, the battery cell 21 can be efficiently cooled when charging and the charging time can be shortened, and the temperature rise can be suppressed when the vehicle is running and high-load driving can be performed. In addition, in the present embodiment, since the sub-flow path 306d and the sub-flow path 306e are formed at the ends of the battery cooler 30 in the +Y direction to the two ends in the X-axis direction, the refrigerant will not stagnate at the position farthest from the inflow portion 31 in the +Y direction, so that the battery cells 21 located at both ends in the X-axis direction can also be cooled.

[0038] The embodiments of the present invention are described above, but the present invention is not limited to the above embodiments and can be implemented in various other ways. For example, the above embodiments can also be modified as follows to implement the present invention. In addition, the above embodiments and the following modifications can be combined respectively. The scheme composed of the constituent elements of the above embodiments and the modifications is also included in the present invention. In addition, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above embodiments or modifications, and various changes can be made.

[0039] In the above embodiment, the battery cooler 30 is arranged on the lower side of the housing 10 , but may be arranged on the upper side of the housing 10 .

[0040] In the present invention, a heat conductive material may be disposed between the lower housing 12 and the battery cooler 30 .

[0041] In the above embodiment, the first auxiliary flow path 305 and the second auxiliary flow path 306 are configured to turn back and forth twice between the first main flow path 303 and the second main flow path 304 and reciprocate once or more, but may be configured to turn back and forth more than four times and reciprocate twice or more.

[0042] The shape of the coolant flow path formed in the second cooling unit 35B is not limited to the shape of the second auxiliary flow path 306 , and may be other shapes. Figure 5 It is a schematic diagram of a modification of the second auxiliary flow path 306 formed in the second cooling unit 35B. Figure 5 The arrows shown indicate the direction of refrigerant flow. Figure 5The second sub-flow path 306A shown is connected to the end of the first main flow path 303 in the +Y direction and the end of the second main flow path 304 in the +Y direction. In this modification, the first main flow path 303 is formed to the end of the battery cooler 30 in the +Y direction.

[0043] The second secondary flow path 306A has sub-flow paths 306f to 306j. The sub-flow path 306f is formed in parallel with the X-axis direction and is connected to the first main flow path 303. The sub-flow path 306h is formed in parallel with the X-axis direction at the end of the battery cooler 30 in the +Y direction at a predetermined interval from the sub-flow path 306f in the +Y direction. In addition, the sub-flow path 306h is formed to the end of the battery cooler 30 in the +X direction, that is, the end of the battery cooler 30 in the width direction. The refrigerant flowing in the +Y direction in the first main flow path 303 flows toward the sub-flow path 306f and the sub-flow path 306h.

[0044] Sub-flow path 306g is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306a in the +Y direction, and sub-flow path 306i is parallel to the X-axis direction and is formed at a predetermined interval from sub-flow path 306h in the -Y direction. In addition, sub-flow path 306i is formed to the end of the battery cooler 30 in the +X direction, that is, the end of the battery cooler 30 in the width direction. The refrigerant flowing in sub-flow path 306f turns back and flows toward sub-flow path 306g, and the refrigerant flowing in sub-flow path 306h turns back and flows toward sub-flow path 306i. Sub-flow path 306j is formed between sub-flow path 306g and sub-flow path 306i in parallel to the X-axis direction. Sub-flow path 306j is connected to sub-flow path 306g and sub-flow path 306i, and the refrigerant flowing in sub-flow path 306g and the refrigerant flowing in sub-flow path 306i merge in sub-flow path 306j. In addition, sub-flow path 306j is connected to the second main flow path 304, and the refrigerant flowing in sub-flow path 306j flows into the second main flow path 304.

[0045] In the second secondary flow path 306A, the end on the downstream side in the flow direction of the refrigerant in the first main flow path 303 is not a blind path, but is connected to the sub-flow path 306h. As a result, the refrigerant flows inside the battery cooler 30 without stagnation, so the battery cell 21 can be cooled efficiently. In addition, in this modified example, since the sub-flow path 306h and the sub-flow path 306i are formed at the ends of the battery cooler 30 in the +Y direction to the two ends in the X-axis direction, the refrigerant will not stagnate at the position farthest from the inflow portion 31 in the +Y direction, so that the battery cells 21 located at both ends in the X-axis direction can also be cooled.

[0046] Fig. 6A It is a schematic diagram of another modified example of the second auxiliary flow path 306 formed in the second cooling unit 35B. Fig. 6A The arrows shown indicate the direction of refrigerant flow. Fig. 6A The second sub-flow path 306B shown is connected to the first main flow path 303 and the second main flow path 304. In this modification, the second main flow path 304 is formed to the end of the battery cooler 30 in the +Y direction.

[0047] The second secondary flow path 306B has sub-flow paths 306k to 306m. Sub-flow path 306m is formed in parallel with the X-axis direction, and is connected to sub-flow path 306l and the end of the first main flow path 303 in the +Y direction. The refrigerant flowing in the +Y direction in the first main flow path 303 flows to sub-flow path 306m. Sub-flow path 306l is formed in parallel with the X-axis direction at a predetermined interval from sub-flow path 306m in the +Y direction. In addition, sub-flow path 306l is formed to the end of the battery cooler 30 in the -X direction, that is, the end of the battery cooler 30 in the width direction. The refrigerant flowing in sub-flow path 306m turns back on the +X direction side and flows to sub-flow path 306l. Sub-flow path 306k is parallel with the X-axis direction and is formed in a predetermined interval from sub-flow path 306l in the +Y direction, and is connected to sub-flow path 306l and the end of the second main flow path 304 in the +Y direction. The sub-flow path 306k is formed to the end of the battery cooler 30 in the -X direction, that is, the end in the width direction of the battery cooler 30. The refrigerant flowing in the sub-flow path 306l turns back and flows toward the sub-flow path 306k, and the refrigerant flowing in the sub-flow path 306k flows toward the second main flow path 304.

[0048] Figure 6B It is a schematic diagram of another modified example of the second auxiliary flow path 306 formed in the second cooling unit 35B. Figure 6B The arrows shown indicate the direction of refrigerant flow. Figure 6B The second sub-flow path 306C shown is connected to the first main flow path 303 and the second main flow path 304. In this modification, the second main flow path 304 is formed to the end of the battery cooler 30 in the +Y direction.

[0049] The second secondary flow path 306C has sub-flow paths 306n to 306p. Sub-flow path 306n is formed parallel to the X-axis direction at the end of the battery cooler 30 in the +Y direction, and is connected to the sub-flow path 306n and the end of the first main flow path 303 in the +Y direction. In addition, sub-flow path 306n is formed to both ends of the battery cooler 30 in the X-axis direction, that is, the ends in the width direction of the battery cooler 30. The refrigerant flowing in the +Y direction in the first main flow path 303 flows toward sub-flow path 306n. Sub-flow path 306o is formed parallel to the X-axis direction at a predetermined interval from sub-flow path 306n to the -Y direction. In addition, sub-flow path 306o is formed to the end of the battery cooler 30 in the +X direction, that is, the end of the battery cooler 30 in the width direction. The refrigerant flowing in sub-flow path 306n turns back on the +X direction side and flows toward sub-flow path 306o. The sub-flow path 306p is parallel to the X-axis direction and is formed at a predetermined interval from the sub-flow path 306o in the -Y direction, and is connected to the sub-flow path 306o and the end of the second main flow path 304 in the +Y direction. The refrigerant flowing in the sub-flow path 306o turns back and flows toward the sub-flow path 306p, and the refrigerant flowing in the sub-flow path 306p flows toward the second main flow path 304.

[0050] In the second sub-flow paths 306B and 306C, the end portion on the downstream side in the flow direction of the refrigerant in the first main flow path 303 is not a blind path. As a result, the refrigerant flows inside the battery cooler 30 without stagnation, so the battery cell 21 can be efficiently cooled. In addition, in the second sub-flow paths 306B and 306C, since the sub-flow path is formed at the end of the battery cooler 30 in the +Y direction to the end in the X-axis direction, the refrigerant will not stagnate at the position farthest from the inflow portion 31 in the +Y direction, so that the battery cell 21 located at the end in the X-axis direction can also be cooled.

[0051] In the present invention, the second secondary flow paths 306, 306A, 306B, 306C may also be configured such that one end connected to the first main flow path 303 is connected to the terminal of the first main flow path 303 in the +Y direction, and the other end connected to the second main flow path 304 is connected to the -Y direction side of the terminal of the second main flow path 304 in the +Y direction. In addition, in the present invention, the second secondary flow paths 306, 306A, 306B, 306C may also be configured such that one end connected to the first main flow path 303 is connected to the -Y direction side of the terminal of the first main flow path 303 in the +Y direction, and the other end connected to the second main flow path 304 is connected to the terminal of the second main flow path 304 in the +Y direction.

Claims

1. A battery cooler for cooling a battery mounted on a vehicle, characterized in that: have: a first main flow path into which the refrigerant flowing in from the inflow portion flows; a second main flow path, wherein the refrigerant flowing in the second main flow path flows to an outflow portion through which the refrigerant flows out; and a secondary flow path, which is provided between the first main flow path and the second main flow path, is connected to the first main flow path and the second main flow path, and the refrigerant flowing into the secondary flow path from the first main flow path flows to the second main flow path, A plurality of the secondary flow paths are provided between the first primary flow path and the second primary flow path, Each of the secondary flow paths reciprocates between the first main flow path and the second main flow path at least once. The secondary flow path farthest from the inflow portion is configured as follows: One end is connected to the downstream end of the first main flow path in the flow direction of the refrigerant; and / or The other end is connected to a terminal end on the upstream side in the flow direction of the refrigerant in the second main flow path.

2. The battery cooler according to claim 1, characterized in that: The reciprocating direction of the secondary flow path is the width direction of the battery cooler. At least a portion of the secondary flow path farthest from the inflow portion is formed to an end portion in the width direction of the battery cooler.

3. The battery cooler according to claim 1, characterized in that: The secondary flow path farthest from the inflow portion branches between the first primary flow path and the second primary flow path, and reciprocates between the first primary flow path and the second primary flow path at least once.

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