Cooling heat exchanger

Abstract

The utility model provides a cooling heat exchanger with a novel structure. The cooling performance of the heat exchanger can be expected to be further improved. A cooling heat exchanger (10) in which a cooling flow path (18) through which a cooling heat medium flows is formed and which cools an object to be cooled that overlaps a cooling surface (12) provided on the front surface, the cooling heat exchanger (10) being provided on a wall portion of the cooling flow path (18) so as to be aligned in the longitudinal direction of the flow path: first protrusions (36a) that protrude from the wall portion of the cooling flow path (18) and protrude from the wall portion of the cooling flow path (18) in the longitudinal direction of the flow path; the first inclined part (38) obliquely extends from the upstream side to the downstream side along the two sides in the width direction; and a second protrusion (36b) provided with a second inclined portion (40) extending obliquely from the downstream side to the upstream side toward both sides in the width direction, the second protrusion (36b) being provided with the second inclined portion (40).

Description

TECHNICAL FIELD

[0001] The present application relates to a cooling heat exchanger used in cooling of a cooling object such as a battery for an electric vehicle. BACKGROUND

[0002] Conventionally, a cooling heat exchanger used in cooling of a battery, an inverter, or the like is known. For example, as disclosed in Japanese Patent Application Publication No. 2011-165939 (Patent Literature 1), the cooling heat exchanger has a structure in which a refrigerant passage through which a cooling medium flows is formed in an internal region between a pair of opposed housing plates that overlap each other. Moreover, a surface of the housing plate is cooled by heat exchange with the cooling medium flowing in the refrigerant passage, and a cooling object overlapping the surface is cooled.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2011-165939 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, the cooling heat exchanger of Patent Literature 1 has the following problem: in the refrigerant passage, the cooling medium flowing in the vicinity of the cooling object is easily heated by heat exchange with the cooling object, whereas the cooling medium flowing away from the cooling object is difficult to produce heat exchange with the cooling object, and the cooling performance is not favorable. Therefore, in Patent Literature 1, a protrusion (reduction portion) is formed to protrude into the refrigerant passage, and the cooling medium is stirred by passing over the protrusion.

[0008] However, the present inventors have found through research that even if the protrusion as in Patent Literature 1 is provided, the cooling performance is not always sufficient.

[0009] The present application provides a cooling heat exchanger of a new structure that can expect further improvement in cooling performance.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] Hereinafter, preferred modes for understanding the present application will be described, but each mode described below is an example, and can be appropriately combined with each other and adopted, and each component described for each mode can be independently recognized and adopted within a possible range, and can be appropriately combined with any component described in another mode. Therefore, in the present application, it is not limited to the modes described below, and various other modes can be implemented.

[0012] The first aspect is a cooling heat exchanger in which a cooling flow path for flowing a cooling medium is formed inside, and a cooling object overlapping a cooling surface provided on a surface is cooled, in which first projections having first inclined portions extending obliquely from an upstream side to a downstream side as they go to both sides in a width direction, and second projections having second inclined portions extending obliquely from the downstream side to the upstream side as they go to both sides in the width direction are arranged in a wall portion of the cooling flow path in a flow path length direction.

[0013] According to the cooling heat exchanger formed in the structure according to the present aspect, the cooling medium that has passed over the first inclined portions of the first projections flows toward the inside in the flow path width direction of the cooling flow path, and the cooling medium that has passed over the second inclined portions of the second projections flows toward the outside in the flow path width direction of the cooling flow path. Therefore, the cooling medium flows over the first projections and the second projections arranged in the flow path length direction of the cooling flow path, whereby the stirring action of the cooling medium is exerted not only in the flow path depth direction of the cooling flow path but also in the flow path width direction. As a result, the local temperature rise of the cooling medium in the cooling flow path is effectively prevented, the heat capacity of the cooling medium can be effectively utilized for cooling of the cooling object, and an improvement in cooling performance can be expected.

[0014] The second aspect is the cooling heat exchanger according to the first aspect, in which the first projections and the second projections are alternately arranged in the flow path length direction of the cooling flow path.

[0015] According to the cooling heat exchanger formed in the structure according to the present aspect, the cooling medium flows over the first projections and the second projections alternately arranged in the flow path length direction of the cooling flow path in turn, whereby the cooling medium is alternately guided to the inside and the outside in the flow path width direction, and the cooling medium is more effectively stirred in the flow path width direction of the cooling flow path. Therefore, the temperature difference of the cooling medium in the cooling flow path is further reduced, and an improvement in cooling performance is achieved.

[0016] The third aspect is the cooling heat exchanger according to the first aspect or the second aspect, in which the first projections and the second projections each have a low projection portion having a low height and a high projection portion having a high height.

[0017] According to the cooling heat exchanger formed in the structure according to the present aspect, by providing the low projection portion having a low height and the high projection portion having a high height in the first projections and the second projections, respectively, the cooling medium flows more easily in the low projection portion than in the high projection portion, whereby the flow of the cooling medium can be controlled by the arrangement of the low projection portion. In addition, in the high projection portion, the stirring action of the cooling medium is advantageously exerted, whereby an improvement in cooling performance based on the stirring of the cooling medium is achieved.

[0018] The fourth aspect is the cooling heat exchanger according to the third aspect, wherein a central portion of the first projection in the flow width direction is formed as the high projection or the low projection, and both end portions of the first projection are formed as the low projection or the high projection, and a central portion of the second projection in the flow width direction is formed as the low projection or the high projection, and both end portions of the second projection are formed as the high projection or the low projection.

[0019] According to the cooling heat exchanger formed in accordance with the present aspect, when the heat medium passes through either one of the first projection and the second projection provided with the low projection at both end portions in the flow width direction of the cooling flow path, the heat medium is easily guided to both outer sides in the flow width direction of the cooling flow path, and when the heat medium passes through the other one of the first projection and the second projection provided with the low projection at a central portion in the flow width direction of the cooling flow path, the heat medium is easily guided to a central side in the flow width direction of the cooling flow path. Therefore, the heat medium passing through the first projection and the second projection is easily stirred in the flow width direction of the cooling flow path, and further improvement of the cooling performance can be expected.

[0020] The fifth aspect is the cooling heat exchanger according to the third or fourth aspect, wherein the first projection and the second projection gradually change in height from the low projection toward the high projection.

[0021] According to the cooling heat exchanger formed in accordance with the present aspect, undesirable flow turbulence and the like caused by a sharp change in height in the first projection and the second projection can be prevented, and smooth flow of the heat medium can be achieved.

[0022] The sixth aspect is the cooling heat exchanger according to any one of the first to fifth aspects, wherein the cooling heat exchanger includes a plurality of the cooling flow paths arranged in parallel.

[0023] According to the cooling heat exchanger formed in accordance with the present aspect, a wide cooling surface can be provided in the flow width direction by the parallel flow path portion. In addition, the parallel flow path portion is formed of a plurality of cooling flow paths arranged in parallel, and the flow width of each cooling flow path can be set with a large degree of freedom, and thus, for example, destabilization of the flow of the heat medium and the like that occurs when the flow width of the cooling flow path is excessively large in order to ensure a wide cooling surface can be avoided.

[0024] The seventh aspect is the cooling heat exchanger according to any one of the first to sixth aspects, wherein the width dimension of the first projection and the second projection is formed to be 50% or more with respect to the flow width of the cooling flow path.

[0025] According to the cooling heat exchanger formed in the structure according to the present mode, the first protrusions and the second protrusions are each formed with a width dimension sufficiently large with respect to the flow path width of the cooling flow path, whereby the flow of the heat medium over the first protrusions and the second protrusions is effectively generated, and improvement of the cooling performance based on the stirring action of the heat medium and the like is achieved.

[0026] The eighth mode is based on the cooling heat exchanger of any one of the first to seventh modes, and the first protrusions and the second protrusions are continuously provided on the entire flow path width direction of the cooling flow path, and are continuously connected to the side wall of the cooling flow path.

[0027] According to the cooling heat exchanger formed in the structure according to the present mode, the first protrusions and the second protrusions are each formed with a width dimension sufficiently large with respect to the flow path width of the cooling flow path, whereby the flow of the heat medium over the first protrusions and the second protrusions is effectively generated, and improvement of the cooling performance based on the stirring action of the heat medium and the like is achieved.

[0028] The ninth mode is based on the cooling heat exchanger of any one of the first to eighth modes, and the width direction center of the first protrusions overlaps the second protrusions in the projection of the flow path length direction of the cooling flow path, and the width direction center of the second protrusions overlaps the first protrusions in the projection of the flow path length direction of the cooling flow path.

[0029] According to the cooling heat exchanger formed in the structure according to the present mode, the first protrusions and the second protrusions are each formed with a width dimension sufficiently large with respect to the flow path width of the cooling flow path, whereby the flow of the heat medium over the first protrusions and the second protrusions is effectively generated, and improvement of the cooling performance based on the stirring action of the heat medium and the like is achieved.

[0030] Utility model effect

[0031] According to the present utility model, further improvement of the cooling performance can be expected in the cooling heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is an exploded perspective view of the cooling heat exchanger as the first embodiment of the present utility model.

[0033] Figure 2 is Figure 1 is a plan view of the cooling heat exchanger shown in Fig. 1, and is a view represented by passing through the cooling surface constituent member.

[0034] Figure 3 is Figure 1 is a partially enlarged sectional view of the cooling heat exchanger shown in Fig. 1, and is a view corresponding to the III-III section of Fig. 1. Figure 2 ​

[0035] Figure 4 is Figure 1 is a partial enlarged sectional view of the cooling heat exchanger shown in Figure 3 is a view of the IV-IV section.

[0036] Figure 5A is a graph showing a simulation result of the velocity distribution in the cooling flow path of the cooling heat exchanger to which the embodiment is applied.

[0037] Figure 5B is a graph showing a simulation result of the velocity distribution in the cooling flow path of the cooling heat exchanger to which the comparative example is applied.

[0038] Figure 6 is a plan view of the cooling heat exchanger as the second embodiment of the present application, which is a view through the upper plate.

[0039] Figure 7 is a partial enlarged sectional view of the cooling heat exchanger shown in Figure 6 is a view of the VII-VII section. Figure 6

[0040] Figure 8 is a partial enlarged sectional view of the cooling heat exchanger shown in Figure 6 is a view of the VIII-VIII section. Figure 6

[0041] Figure 9 is a partial enlarged sectional view of the cooling heat exchanger shown in Figure 6 is a view of the IX-IX section. Figure 6

[0042] Figure 10 is a sectional view showing a part of the cooling heat exchanger as another embodiment of the present application.

[0043] Figure 11 is an exploded perspective view of the cooling heat exchanger as the third embodiment of the present application.

[0044] Figure 12 is a plan view of the inner fin constituting the cooling heat exchanger shown in Figure 11

[0045] Figure 13 is a partial enlarged sectional view of the inner fin shown in Figure 12 is a view of the XIII-XIII section. Figure 12

[0046] Figure 14 Figure 12 ​​​​​​A partial enlarged sectional view of the cooling heat exchanger shown is a view corresponding to the XIV-XIV section of Figure 12 .

[0047] Explanation of Reference Numerals

[0048] 10: cooling heat exchanger (first embodiment); 12: cooling surface; 14: upper plate; 16: lower plate; 18 (18a-18e): cooling flow path; 20: outer peripheral wall portion; 22: supply hole; 24: discharge hole; 26: partition wall portion; 28: enclosed region; 32: parallel flow path portion; 34 (34a, 34b): single flow path portion; 36: protrusion; 36a: first protrusion; 36b: second protrusion; 38: first inclined portion; 40: second inclined portion; 50: cooling heat exchanger (second embodiment); 52: lower plate; 54: protrusion; 54a: first protrusion; 54b: second protrusion; 56: high protrusion portion; 58: low protrusion portion; 60: cooling heat exchanger (third embodiment); 62: lower plate; 64: inner fin; 66: inclined plate portion; 68: top portion; 70: protrusion; 70A: upper protrusion; 70B: lower protrusion; 70a: first protrusion; 70b: second protrusion; 70Aa: first upper protrusion; 70Ab: second upper protrusion; 70Ba: first lower protrusion; 70Bb: second lower protrusion. DETAILED DESCRIPTION

[0049] Hereinafter, the embodiments of the present application will be described with reference to the drawings.

[0050] In Figures 1-4 , a cooling heat exchanger 10 that is a first embodiment of the present application is shown. The cooling heat exchanger 10 has a structure in which a flat plate-shaped upper plate 14 having a cooling surface 12 and a concave lower plate 16 are overlaid, and between these upper plate 14 and lower plate 16, a cooling flow path 18 through which a cooling heat medium flows is formed. Moreover, a cooling target such as a battery that is not shown and that is overlaid with the cooling surface 12 is cooled by heat exchange with the heat medium via the upper plate 14. In the following description, the up-down direction refers to the up-down direction in Figure 3 , the front-rear direction refers to the up-down direction in Figure 2 , and the left-right direction refers to the left-right direction in Figure 2 .

[0051] The upper plate 14 is formed, for example, of a metal such as iron or an aluminum alloy, a thermally conductive synthetic resin mixed with a thermally conductive filler, or the like, and a thermal conductivity higher than that of the lower plate 16 is preferably set. The upper plate 14 is formed in a thin-walled substantially rectangular flat plate shape that extends in a substantially constant thickness dimension, and an upper surface is formed as the flat cooling surface 12. In the upper plate 14, the flow path length direction of the cooling flow path 18, that is, the left-right direction, is formed to be longer than the flow path width direction of the cooling flow path 18, that is, the front-rear direction.

[0052] The lower plate 16 is formed of a metal such as iron or an aluminum alloy, a synthetic resin, or the like, and has a substantially rectangular plate shape as a whole. The lower plate 16 has a shape corresponding to the upper plate 14 when viewed in the vertical direction. A rectangular frame-shaped outer peripheral wall portion 20 protruding upward is provided at an outer peripheral end portion of the lower plate 16. Moreover, the inner peripheral side of the outer peripheral wall portion 20 in the lower plate 16 has a rectangular recessed shape opening upward, and a supply hole 22 and a discharge hole 24 penetrating in the vertical direction are formed at the diagonal portions on one side of the recess. A cylindrical connection portion protruding from the lower surface of the lower plate 16 is provided at each of the supply hole 22 and the discharge hole 24.

[0053] A plurality of partition wall portions 26 are provided in the lower plate 16 inward of the outer peripheral wall portion 20. The partition wall portions 26 protrude upward from the lower wall portion of the lower plate 16 and extend linearly in the left-right direction with a substantially constant cross section. The left-right direction end portions of the partition wall portions 26 are located at positions separated to the left and right central sides without reaching the outer peripheral wall portion 20. The number of the partition wall portions 26 is not particularly limited, and in the present embodiment, four are provided, arranged at substantially equal intervals in the front-rear direction.

[0054] Moreover, the upper plate 14 overlaps the upper surfaces of the lower plate 16, and these are fixed to each other. The upper plate 14 overlaps the upper surfaces of the outer peripheral wall portion 20 and the plurality of partition wall portions 26 in the lower plate 16, and these overlapping surfaces are fixed by brazing, adhesion, fusion, or the like, and are liquid-tightly sealed.

[0055] A sealed region 28 in which a heat medium is sealed inward of the outer peripheral wall portion 20 is formed between the upper plate 14 and the lower plate 16. The sealed region 28 is connectable to an external piping (not shown) through the supply hole 22 and the discharge hole 24, and the heat medium is supplied through the supply hole 22 and discharged through the discharge hole 24.

[0056] A plurality of cooling flow paths 18 are formed in the sealed region 28. The cooling flow paths 18 are formed between the outer peripheral wall portions 20 and the partition wall portions 26 adjacent in the front-rear direction and between the partition wall portions 26 adjacent in the front-rear direction, respectively. In the cooling flow paths 18, the left side (left side in the Figure 2 ) in the flow path length direction on the supply hole 22 side is the upstream side, and the right side (right side in the Figure 2 ) on the discharge hole 24 side is the downstream side. In the present embodiment, five cooling flow paths 18a to 18e are arranged in the front-rear direction, and a parallel flow path portion 32 is constituted by these five cooling flow paths 18a to 18e arranged in parallel.

[0057] Single-flow sections 34a and 34b are formed on the left and right sides, deviating from the parallel flow path sections 32 in the sealed region 28 in the left-right direction. Each single-flow section 34a is connected to one of the five cooling flow paths 18a-18e. A supply hole 22 is formed in the upstream single-flow section 34a, and a discharge hole 24 is formed in the downstream single-flow section 34b. Furthermore, the heat medium supplied to the upstream single-flow section 34a through the supply hole 22 via an external supply pipe (not shown) is distributed to the five cooling flow paths 18a-18e and flows, then converges in the downstream single-flow section 34b and is discharged through the discharge hole 24 to an external discharge pipe (not shown). Thus, the heat medium circulates within the sealed region 28, including the cooling flow path 18. Additionally, the external supply pipe may be connected to, for example, a heat exchanger (radiator) or a refrigerator to cool the heat medium. The heat transfer medium is supplied to the cooling flow path 18 from an external supply pipe at a low temperature. After being heated by heat exchange with the battery pack or the like that being cooled, it is discharged to an external discharge pipe and cooled down again by a heat exchanger or the like. In this way, the heat transfer medium preferably circulates in a closed loop.

[0058] Multiple protrusions 36 are formed on the bottom wall of the cooling flow path 18 formed by the lower plate 16. The protrusions 36 are integrally formed with the lower plate 16 and protrude upwards from the lower plate 16. For example... Figure 3 As shown, in this embodiment, the protrusion 36 is formed as a generally triangular cross-section in the length direction of the cooling flow path 18, tapering towards the front end, and extends along the width direction of the cooling flow path 18. The maximum width dimension of the protrusion 36 is preferably 50% or more, more preferably 70% or more, of the width dimension of the cooling flow path 18. In this embodiment, the protrusion 36 is continuously provided throughout the width direction of the cooling flow path 18, and its end in the width direction is directly and continuously connected to the outer peripheral wall portion 20 or the partition wall portion 26. In this embodiment, a plurality of protrusions 36 are distributed throughout the entire parallel flow path portion 32 composed of five cooling flow paths 18a to 18e.

[0059] The protrusion 36 includes a first protrusion 36a and a second protrusion 36b. The first protrusion 36a and the second protrusion 36b are respectively formed into a V-shape when viewed from the upper surface. The first protrusion 36a faces the upstream side and its front-to-back width decreases, and the second protrusion 36b faces the downstream side and its front-to-back width decreases.

[0060] The first protrusion 36a has two outer sides facing the flow path width direction of the cooling flow path 18, and a pair of first inclined portions 38, 38 that slope from the upstream side (front) to the downstream side (rear) of the cooling flow path 18, with the front and rear width dimensions gradually decreasing towards the front. In this embodiment, the first inclined portion 38 is inclined at an approximately certain angle relative to the flow path length direction and extends in a straight line.

[0061] The width of the first protrusion 36a is preferably 50% or more, more preferably 70% or more, relative to the width of the cooling flow path 18. In this embodiment, the first protrusion 36a is provided continuously throughout the width direction of the cooling flow path 18, and its two ends in the width direction are integrally connected to the outer peripheral wall portion 20 or the partition wall portion 26 constituting the sidewall of the cooling flow path 18. Furthermore, the width of the first protrusion 36a and the second protrusion 36b in the width direction of the cooling flow path 18 varies in the length direction of the cooling flow path 18, but the width dimension referred to here is the distance between the two ends in the width direction of the cooling flow path 18, which is the maximum width dimension.

[0062] The second protrusion 36b has two outer sides facing the flow path width direction of the cooling flow path 18, and a pair of second inclined portions 40, 40 that slope backward from the downstream side (i.e., rearward to upstream side, i.e., frontward) of the cooling flow path 18, with the front-to-back width dimension gradually decreasing towards the rear. In this embodiment, the second inclined portion 40 slopes at an approximately certain angle relative to the flow path length direction and extends in a straight line. In this embodiment, the second protrusion 36b is formed in a shape that is symmetrical with respect to the first protrusion 36a about an orthogonal plane with respect to the flow path length direction; in other words, it is formed in a rotationally symmetrical shape about a central axis extending in the vertical direction by 180 degrees.

[0063] The width dimension (maximum width dimension) of the second protrusion 36b is preferably 50% or more, more preferably 70% or more, relative to the flow path width dimension of the cooling flow path 18. In this embodiment, the second protrusion 36b is provided continuously throughout the flow path width direction of the cooling flow path 18, and both ends in the width direction are integrally connected to the outer peripheral wall portion 20 or the partition wall portion 26 constituting the sidewall of the cooling flow path 18.

[0064] The first protrusion 36a and the second protrusion 36b are arranged along the length of the cooling flow path 18, and in this embodiment, they are alternately arranged along the length of the flow path. Figure 3 As shown, in adjacent first protrusions 36a and second protrusions 36b along the length of the flow path, the two ends of the cooling flow path 18 in the width direction are closer to each other than the central portion, forming a group arranged in a roughly diamond shape when viewed from the top surface. Multiple groups of these first protrusions 36a and second protrusions 36b are provided separately along the length of the flow path; in this embodiment, 10 groups are arranged at approximately equal intervals along the length of the flow path. In this embodiment, the groups of first protrusions 36a and second protrusions 36b are dispersed throughout the parallel flow path portion 32. Furthermore, the two ends of the first protrusions 36a and second protrusions 36b constituting a group are close to each other in the width direction but spaced apart without contact.

[0065] The width direction center of the first protrusion 36a overlaps the second protrusion 36b in a projection of the cooling flow path 18 in the flow path length direction, and the width direction center of the second protrusion 36b overlaps the first protrusion 36a in a projection of the cooling flow path 18 in the flow path length direction. In the present embodiment, the width direction center of the first protrusion 36a and the width direction center of the second protrusion 36b overlap each other in a projection of the cooling flow path 18 in the flow path length direction. Further, in the present embodiment, the width direction center of the first protrusion 36a is a portion located on the most upstream side, and the width direction center of the second protrusion 36b is a portion located on the most downstream side.

[0066] The upper plate 14 overlaps the lower plate 16 formed in the above-described structure, thereby forming the cooling heat exchanger 10. In the cooling heat exchanger 10, an external pipe not shown is connected to the supply hole 22 and the discharge hole 24 provided in the lower plate 16, and a heat medium flows in the cooling flow path 18 formed between the upper plate 14 and the lower plate 16.

[0067] Further, a battery pack not shown as a cooling target overlaps the upper surface of the upper plate 14, that is, the cooling surface 12. Further, heat exchange via the upper plate 14 occurs between the battery pack which generates heat due to work and the low-temperature heat medium flowing in the cooling flow path 18, whereby the battery pack is cooled. Further, the arrangement of the battery pack on the cooling surface 12 is not particularly limited, and for example, a plurality of battery packs are arranged in the flow path length direction of the cooling flow path 18, and these plurality of battery packs are cooled by the heat medium flowing in the cooling flow path 18. Further, the battery pack can directly overlap the cooling surface 12, and for example, can indirectly overlap via a soft heat-conductive gel, a heat-conductive sheet, or the like, whereby the gap from the cooling surface 12 is filled with a material having a high heat conductivity, and an increase in heat exchange efficiency can be expected.

[0068] However, in the conventional cooling heat exchanger, the heat medium flowing in the cooling flow path 18 gradually becomes high-temperature as it goes to the downstream side because it receives heat from the battery pack. Therefore, on the downstream side of the cooling flow path 18, the temperature difference between the heat medium and the battery pack is smaller than on the upstream side, and the cooling efficiency of the battery pack, that is, the cooling performance of the cooling heat exchanger decreases. In particular, the heat medium flowing in the upper portion of the cooling flow path 18 close to the cooling surface 12 easily increases in temperature due to heat exchange with the battery pack, and therefore, in the conventional cooling heat exchanger, the temperature of the heat medium in the upper portion increases, and therefore, even if the heat medium in the lower portion is low-temperature, the cooling performance decreases.

[0069] Therefore, in the cooling heat exchanger 10 of the present embodiment, the protrusions 36 are provided on the bottom surface (lower wall surface) of the cooling flow path 18, and the heat medium flows over the protrusions 36 in the cooling flow path 18, whereby the heat medium flowing in the upper portion of the cooling flow path 18 mixes with the heat medium flowing in the lower portion at the time of passing over the protrusions 36. Thus, the heat medium in the upper portion is prevented from becoming high-temperature due to heat exchange with the battery pack, and the heat capacity of the heat medium flowing in the cooling flow path 18 can be effectively utilized to achieve excellent cooling performance. In particular, the temperature increase of the heat medium can be suppressed until the downstream side of the cooling flow path 18, and thus the battery pack arranged on the downstream side of the cooling flow path 18 can also be effectively cooled.

[0070] Further, on the downstream side of the first protrusion 36a, the heat medium passing over the pair of first inclined portions 38, 38 flows in toward the inner side in the flow path width direction of the cooling flow path 18 and merges, whereby formation of a vortex-like flow can also be expected. In this way, in the cooling heat exchanger 10, the heat medium is also stirred by the formation of the vortex, and thus an increase in cooling performance based on averaging of the temperature of the heat medium is achieved.

[0071] Further, for example, in the case where a plurality of battery packs are arranged in the flow path length direction of the cooling flow path 18, it is important to effectively cool all of these battery packs. That is, in these plurality of battery packs, if even one of the performance decreases, there is a case where the performance of the entire battery greatly decreases. In this case, for example, in the conventional cooling heat exchanger in which the battery pack arranged on the downstream side of the cooling flow path 18 is easily deteriorated due to insufficient cooling, it is feared that the desired battery performance cannot be obtained. In contrast to this, the cooling heat exchanger 10 of the present embodiment is likely to maintain the cooling performance to the downstream side of the cooling flow path 18 compared to the conventional cooling heat exchanger, and thus it is possible to prevent the battery pack on the downstream side from being deteriorated by heat and achieve stabilization of the battery performance.

[0072] The protrusions 36 include the first protrusion 36a which expands toward the outer side in the flow path width direction toward the downstream side, and the second protrusion 36b which narrows toward the inner side in the flow path width direction toward the downstream side. When passing over the first protrusion 36a, the heat medium is likely to flow in the direction orthogonal to the pair of first inclined portions 38, 38 in which the flow resistance is small, and forms a flow toward the central side in the flow path width direction. Further, when passing over the second protrusion 36b, the heat medium is likely to flow in the direction orthogonal to the pair of second inclined portions 40, 40 in which the flow resistance is small, and forms a flow toward the both outer sides in the flow path width direction. Thus, the heat medium flowing in the cooling flow path 18 is mixed not only in the depth direction of the cooling flow path 18 but also in the flow path width direction of the cooling flow path 18 by passing over the protrusions 36 including the first protrusion 36a and the second protrusion 36b, and thus further improvement in cooling performance based on averaging of the temperature of the heat medium is achieved.

[0073] In the present embodiment, the first protrusions 36a and the second protrusions 36b are alternately arranged in the flow path length direction, and the heat medium is effectively stirred in the flow path width direction. In addition, the first protrusions 36a and the second protrusions 36b are arranged in close proximity in groups, and in the first protrusions 36a and the second protrusions 36b in these close proximity arrangements, the stirring effect of the heat medium in the flow path width direction can be advantageously exerted.

[0074] In the projection of the cooling flow path 18 in the flow path length direction, the width direction center of the first protrusion 36a overlaps the second protrusion 36b, and the width direction center of the second protrusion 36b overlaps the first protrusion 36a. Therefore, the heat medium easily flows over both the first protrusion 36a and the second protrusion 36b, and by the flow toward the inner side of the width direction based on the overpassing of the first protrusion 36a and the flow toward the outer side of the width direction based on the overpassing of the second protrusion 36b, the improvement of the cooling performance based on the stirring of the heat medium is effectively achieved. In particular, in the present embodiment, both the first protrusion 36a and the second protrusion 36b are continuously arranged throughout the entire flow path width direction of the cooling flow path 18, and thus, flow that bypasses the first protrusion 36a and the second protrusion 36b without overpassing the first protrusion 36a and the second protrusion 36b does not occur, and the stirring effect based on the overpassing of the first protrusion 36a and the second protrusion 36b is effectively exerted.

[0075] Further, in Figure 5A , the velocity distribution when the heat medium flows in a portion of the cooling heat exchanger 10 related to the present embodiment that has both the first protrusions 36a and the second protrusions 36b is shown. In addition, in Figure 5B , the velocity distribution when the heat medium flows in a portion of the cooling heat exchanger that is a comparative example that has only the first protrusions 36a is shown. Further, Figure 5A , Figure 5B The original drawing that is output as a simulation result is not clear due to the reason of the conversion to a gray scale image for the procedure of the patent application, but in the original drawing, the portion where the flow rate is slow is represented in blue, and the portion where the flow rate is fast is represented in red, and thus, the following will be described with respect to the difference in the hue based on the flow rate.

[0076] In Figure 5B , which shows the flow rate distribution of the comparative example, the heat medium flows into the central side of the flow path width direction when passing through the first inclined portion 38 of the first protrusion 36a and the first inclined portion 38, and thus, in the downstream side of any first protrusion 36a, there is a portion a represented in red that indicates fast flow in the central portion of the flow path width direction of the cooling flow path 18, and there is a portion β represented in blue that indicates the stagnation of flow in the both end portions of the flow path width direction of the cooling flow path 18, particularly in the downstream side of the first protrusion 36a. In this way, in Figure 5BIn the comparative example involved, the hot medium flows continuously at a fast velocity in the central part of the flow path width direction of the cooling flow path 18, while the two ends of the flow path width direction of the cooling flow path 18 are prone to become stagnant areas with low flow velocity, making it difficult to obtain sufficient stirring effect of the hot medium.

[0077] On the other hand, the flow velocity distribution in the cooling flow path 18 of the cooling heat exchanger 10 according to this embodiment is shown in... Figure 5A In the cooling flow path 18, a difference in velocity distribution occurs downstream of the first protrusion 36a and downstream of the second protrusion 36b. Specifically, downstream of the first protrusion 36a, the velocity in the central portion of the flow path width direction is faster than at both ends, while downstream of the second protrusion 36b, the velocity at both ends of the flow path width direction is faster than in the central portion. Therefore, the velocity difference of the heat medium in the flow path width direction is relatively small, and the slower-flowing blue region is narrower than in the comparative example. Thus, in... Figure 5A In the embodiment (cooling heat exchanger 10), the heat medium flows over either the first protrusion 36a or the second protrusion 36b, thereby being stirred throughout the flow path width direction. The continuous fast flow in the central part of the flow path width direction and the significant stagnation at both ends of the flow path width direction, which were confirmed in the comparative example above, disappear, resulting in excellent cooling performance.

[0078] As described above, in the cooling heat exchanger 10 according to this embodiment, the stirring effect of the heat medium in the flow path width direction is more advantageous than in the comparative example, which can also be achieved through... Figure 5A , Figure 5B The simulation results of the flow velocity distribution of the heat medium in the cooling flow path 18 shown are used to confirm this.

[0079] exist Figures 6-9 The image shows a cooling heat exchanger 50 as a second embodiment of the present invention. Figures 7-9 As shown, the cooling heat exchanger 50 is formed by overlapping an upper plate 14 and a lower plate 52. In the following description, components and parts that are substantially the same as those in the first embodiment are sometimes labeled with the same reference numerals in the figures and their descriptions are omitted.

[0080] like Figure 6 As shown, the lower plate 52 is integrally formed into a rounded rectangular plate. In this embodiment, the lower plate is integrally formed by stamping a metal part. Five cooling flow paths 18a to 18e are formed in the lower plate 52, and multiple protrusions 54 are formed in each cooling flow path 18. Figure 7 As shown, the protrusion 54 in this embodiment has an arc-shaped cross-section and its surface is composed of a smooth, continuous curved surface.

[0081] The protrusion 54 includes a first protrusion 54a having a pair of first inclined portions 38, 38 that are inclined outwards in the direction of the flow width of the cooling flow path 18 toward the downstream side, and a second protrusion 54b having a pair of second inclined portions 40, 40 that are inclined in the direction of the flow width of the cooling flow path 18 toward the downstream side. The first protrusion 54a and the second protrusion 54b located adjacent to each other on their downstream side are similarly grouped with the first protrusion 36a and the second protrusion 36b in the first embodiment.

[0082] like Figure 7 , Figure 9 As shown, the central portion of the first protrusion 54a in the flow path width direction is formed as a high protrusion 56, and the two ends in the flow path width direction are formed as low protrusions 58. In this embodiment, the height of the first protrusion 54a gradually decreases from the high protrusion 56 toward the low protrusions 58.

[0083] like Figure 8 , Figure 9 As shown, the central portion of the second protrusion 54b in the flow path width direction is formed as a low protrusion 58 with a low height, and the two ends in the flow path width direction are formed as high protrusions 56 and high protrusions 57 with a high height. In this embodiment, the second protrusion 54b gradually increases in height from the low protrusion 58 toward the high protrusions 56 and high protrusions 57.

[0084] In addition, such as Figure 6 As shown, the shapes of the first protrusion 54a and the second protrusion 54b are different when viewed from the top surface due to their height difference. That is, compared to the second protrusion 54b, which gradually increases in height from the center of the width direction towards both sides, the first protrusion 54a, which gradually decreases in height from the center of the width direction towards both sides, is longer in the flow path length direction at the center of the width direction and shorter in the flow path length direction at both ends of the width direction.

[0085] The cooling heat exchanger 50 according to the second embodiment described above achieves the same effect as the cooling heat exchanger 10 according to the first embodiment. Furthermore, the lower plate 52 is a stamped metal part, making it easy to manufacture.

[0086] Furthermore, a high protrusion 56 is provided at the center of the first protrusion 54a in the width direction, and low protrusions 58 are provided at both ends of the first protrusion 54a in the width direction. Similarly, a high protrusion 56 is provided at both ends of the second protrusion 54b in the width direction, and a low protrusion 58 is provided at the center of the second protrusion 54b in the width direction. As a result, the hot medium tends to flow towards the low protrusions 58 where the flow resistance is low, and the hot medium tends to flow in the width direction of the flow path. Therefore, by forming the high protrusions 56 and low protrusions 58 of the protrusions 54, the cooling performance of stirring in the width direction of the flow path based on the hot medium can also be improved.

[0087] In addition, such as Figure 10 As shown, a high protrusion 56 and a low protrusion 58 can also be provided for the protrusion 36 with a generally triangular cross section as shown in the first embodiment.

[0088] exist Figure 11 The image shows a cooling heat exchanger 60 as a third embodiment of the present invention. The cooling heat exchanger 60 has a structure in which inner fins 64 are arranged between the upper plate 14 and the lower plate 62.

[0089] The lower plate 62 is formed into a generally rectangular plate in which the length of the cooling flow path 18 described later is longer than its width. An outer peripheral wall portion 20 is integrally provided at the outer peripheral end of the lower plate 62, protruding upward and extending continuously throughout the entire circumference. In this embodiment, the lower plate 62 is preferably made of a material with high thermal conductivity, similar to the upper plate 14, and the lower surface (not shown) is a cooling surface, just like the upper surface of the upper plate 14.

[0090] The inner fin 64 is formed from metal, synthetic resin, or the like, and is formed into a thin-walled plate shape. In this embodiment, the inner fin 64 is a stamped metal part. The inner fin 64 has a cross-section with serrated and wavy folds. In this embodiment, multiple flat, inclined plate portions 66 that extend obliquely in the vertical and horizontal directions are formed with a serrated cross-section that is integrally and continuously provided at the folded tops 68 in the horizontal direction. The inner fin 64 extends linearly in the horizontal direction with a generally fixed cross-sectional shape. Furthermore, the number of folds (the number of tops 68) of the serrated and wavy inner fin 64 is not particularly limited, and can be appropriately set, for example, taking into account the cross-sectional area of ​​the cooling flow path 18 (described later) divided by the inner fin 64.

[0091] The inner fin 64 is disposed between the upper plate 14 and the lower plate 16. Compared to the upper plate 14 and the lower plate 16, the length dimension of the inner fin 64 in the left-right direction is smaller, and it is disposed separately from the supply hole 22 and discharge hole 24 provided at both ends of the lower plate 62 in the central part of the left-right direction. Thus, the single flow path section 34a and the single flow path section 34b of this embodiment are provided on both sides that are offset from the inner fin 64 to the left and right.

[0092] For example, the top 68 of the inner fin 64 is brazed to the upper plate 14 and the lower plate 16 to position the inner fin 64 relative to the upper plate 14 and the lower plate 16. As a result, a plurality of cooling flow paths 18 separated by the inner fin 64 are arranged side by side in the flow path width direction between the overlapping surfaces of the upper plate 14 and the lower plate 16, and these plurality of cooling flow paths 18 constitute the side-by-side flow path section 32 of this embodiment.

[0093] Parallel flow path sections 32 are formed on the upper and lower sides of the inner fin 64, respectively. The cooling surface 12 of the upper plate 14 is cooled by the hot medium flowing in the parallel flow path section 32 on the upper side of the inner fin 64, and the cooling surface of the lower plate 62 (not shown) is cooled by the hot medium flowing in the parallel flow path section 32 on the lower side of the inner fin 64. The wall of the cooling flow path 18 in this embodiment is formed by two inclined plate sections 66, 66 that are continuous through one of the tops 68 of the inner fin 64, and the upper plate 14 or the lower plate 16, forming a generally triangular cross section.

[0094] Protrusions 70 are formed in the inner fin 64. The protrusions 70 include an upper protrusion 70A protruding from the upper surface of the inner fin 64 and a lower protrusion 70B protruding from the lower surface of the inner fin 64. Additionally, the protrusions 70 include a first protrusion 70a having a pair of first inclined portions 38, 38 that slope outwards from the center in the width direction of the cooling flow path 18 towards the downstream side, and a second protrusion 70b having a pair of second inclined portions 40, 40 that slope outwards from the outer sides in the width direction of the cooling flow path 18 towards the center. Through the above combination, the inner fin 64 has a first upper protrusion 70Aa and a second upper protrusion 70Ab protruding from the upper surface, and a first lower protrusion 70Ba and a second lower protrusion 70Bb protruding from the lower surface. In summary, the upper protrusion 70A includes the first upper protrusion 70Aa and the second upper protrusion 70Ab, and the lower protrusion 70B includes the first lower protrusion 70Ba and the second lower protrusion 70Bb. In addition, the first protrusion 70a includes a first upper protrusion 70Aa and a first lower protrusion 70Ba, and the second protrusion 70b includes a second upper protrusion 70Ab and a second lower protrusion 70Bb.

[0095] like Figure 12 As shown, the first upper protrusion 70Aa and the second upper protrusion 70Ab are alternately arranged along the length of a cooling flow path 18. The first upper protrusion 70Aa and the second upper protrusion 70Ab, which are adjacent to each other on their downstream side, are arranged close to each other to form a group. Figure 13 As shown, the central portion of the first upper protrusion 70Aa in the width direction is formed as a high protrusion 56, and the two ends in the width direction are formed as low protrusions 58. On the other hand, as Figure 14As shown, the central portion of the second upper protrusion 70Ab in the width direction is formed as a low protrusion 58, and the two ends in the width direction are formed as high protrusions 56 and high protrusions 57.

[0096] like Figure 12 As shown, the first lower protrusion 70Ba and the second lower protrusion 70Bb are alternately arranged in a cooling flow path 18 along the length of the flow path. The first lower protrusion 70Ba and the second lower protrusion 70Bb, which are adjacent to each other on their downstream side, are arranged close to each other to form a group. Figure 14 As shown, the central portion of the first lower protrusion 70Ba in the width direction is formed as a high protrusion 56, and the two ends in the width direction are formed as low protrusions 58. On the other hand, as Figure 13 As shown, the second lower protrusion 70Bb has a low protrusion 58 at its central portion in the width direction, and high protrusions 56 at both ends in the width direction. Furthermore, in this embodiment, the height of each protrusion 70 gradually changes from the high protrusion 56 toward the low protrusion 58.

[0097] In the cooling heat exchanger 60 with the structure described above, the battery pack (not shown) and other components to be cooled overlap with the cooling surface 12 of the upper plate 14 and the cooling surface (not shown) of the lower plate 62, respectively. Furthermore, the heat medium flowing from the supply hole 22 to the discharge hole 24 cools the battery pack by exchanging heat with it via the upper plate 14 or the lower plate 62 when passing through multiple cooling flow paths 18 formed on the upper and lower sides of the inner fins 64. Moreover, by overlapping the cooling heat exchanger 60 and the battery pack alternately in the vertical direction, a battery cell structure can be formed in which both sides of each battery pack are cooled by the cooling heat exchanger 60.

[0098] The hot medium flowing in the cooling flow path 18 is disturbed and agitated as it passes over the protrusions 70 formed in the inner fins 64. This prevents the hot medium from reaching high temperatures only near the upper and lower ends of the battery pack, thereby improving cooling performance. In this embodiment, the height of the first protrusion 70a decreases from the center outwards in the width direction, and the height of the second protrusion 70b increases from the center outwards in the width direction. By alternately arranging these first protrusions 70a and second protrusions 70b in the length direction of the flow path, the hot medium can easily flow in the low protrusions 58 where the flow resistance is low, thereby expecting an agitation effect of the hot medium in the width direction of the flow path.

[0099] In addition, in the protrusions 70, the first protrusions 70a and the second protrusions 70b are alternately arranged in the flow path length direction, whereby flow toward the central side in the flow path width direction and flow toward the outer sides in the flow path width direction are alternately generated, and a stirring action in the flow path width direction is exerted. As described above, even in the case where the inner fins 64 are provided with the protrusions 70, improvement of cooling performance based on the stirring action of the heat medium can be achieved.

[0100] The above describes the embodiments of the present application in detail, but the present application is not limited to the specific description. For example, the first protrusions and the second protrusions do not necessarily need to be alternately arranged in the flow path length direction of the cooling flow path. Specifically, for example, in the flow path length direction of the cooling flow path, as long as both the first protrusions and the second protrusions are provided, a plurality of first protrusions can be continuously arranged, and a plurality of second protrusions can be continuously arranged.

[0101] For example, the width dimension and the height dimension of the first protrusions and the second protrusions can be different from each other. In addition, the angle formed by the first inclined portion of the first protrusion and the flow path length direction can not be the supplementary angle of the angle formed by the second inclined portion of the second protrusion and the flow path length direction. In summary, the inclination angle of the first inclined portion and the inclination angle of the second inclined portion can be independently set from each other. In addition, the first inclined portion and the second inclined portion are not limited to a shape extending in a straight line, and can be a broken line shape in which the inclination angle is changed in stages, a curved shape in which the inclination angle is gradually changed, or the like.

[0102] The connecting portion of the pair of first inclined portions located at the most upstream side in the first protrusions can be offset in the flow path width direction with respect to the center of the flow path width direction of the cooling flow path. Similarly, the connecting portion of the pair of second inclined portions located at the most downstream side in the second protrusions can be offset in the flow path width direction with respect to the center of the flow path width direction of the cooling flow path.

[0103] In the first embodiment, the first protrusion and the second protrusion located on the downstream side thereof are close to each other in the flow path length direction to form a group, but for example, the first protrusion and the second protrusion located on the downstream side thereof can not be close to each other in the flow path length direction to form a group. In addition, the protrusion located on the most upstream side in the cooling flow path can be either of the first protrusion and the second protrusion. In addition, the protrusion located on the most downstream side in the cooling flow path can also be either of the first protrusion and the second protrusion. In addition, it is not necessary that all of the first protrusions and the second protrusions on the flow path form a group, and there can be protrusions that do not form a group, protrusions of different forms, and the like on the flow path. In summary, in the present specification, the "first protrusion and the second protrusion close to each other to form a group" does not specify the relative positional relationship in the flow path length direction of the first protrusion and the second protrusion, nor does it specify the distance apart in the flow path length direction of the first protrusion and the second protrusion. Preferably, no other different protrusions or the like are provided between the "first protrusion and the second protrusion close to each other to form a group", and in addition, the distance apart in the flow path length direction in the respective flow path width direction central portions of the first protrusion and the second protrusion forming a pair is set to be 5 times or less (more preferably 3 times or less, and further preferably 2 times or less) of the flow path width.

[0104] The protrusions can be provided locally in the flow path width direction of the cooling flow path, and the width direction end portions of the protrusions can be separated from the side walls of the cooling flow path. In addition, the protrusions can be provided at positions biased to one side in the flow path width direction of the cooling flow path, and the distances from the width direction both ends to the two side walls of the cooling flow path can be different from each other. In addition, the protrusions can be provided at equal intervals in the flow path length direction of the cooling flow path, or can be arranged at different intervals in a manner that creates a sparse and dense pattern. In addition, in the case where a plurality of cooling flow paths are provided, it is sufficient that the first protrusion and the second protrusion are provided in at least one of the cooling flow paths, and the number of protrusions formed, the arrangement, the shape including the size, and the like can be different from each other among these plurality of cooling flow paths. In addition, the protrusions do not need to be provided so as to be distributed throughout the entire flow path length direction of the cooling flow path, and can be provided locally in the flow path length direction. In summary, the protrusions can be appropriately changed in the number of protrusions formed, the arrangement, the shape including the size, the interval, and the like in accordance with the heat generation amount, the temperature distribution, and the like of the cooling object.

[0105] The heights of the plurality of protrusions arranged in the flow path length direction of the cooling flow path can be varied, and for example, if the heights are made higher on the downstream side of the cooling flow path, the decrease in the cooling performance on the downstream side of the cooling flow path can be more effectively suppressed.

[0106] Also, a plurality of protrusions can be arranged in the flow path width direction in one cooling flow path, whereby, for example, in the case where the flow path width of the cooling flow path is wide, the length dimension of the protrusion in the flow path length direction can be prevented from becoming large without making the inclination angle of the inclined portion of the protrusion small. Also, in the case where a plurality of protrusions are arranged in the flow path width direction of the cooling flow path, these plurality of protrusions can also be integrally provided in continuation with each other.

[0107] In the second to fourth embodiments, examples are shown in which the first protrusions have high protruding portions in the width direction central portions and low protruding portions in the width direction end portions, and the second protrusions have low protruding portions in the width direction central portions and high protruding portions in the width direction end portions, but it can also be, for example, that the first protrusions have low protruding portions in the width direction central portions and high protruding portions in the width direction end portions, and the second protrusions have high protruding portions in the width direction central portions and low protruding portions in the width direction end portions. Also, among the plurality of first protrusions, protrusions having high protruding portions in the width direction central portions and protrusions having low protruding portions in the width direction central portions can be mixed, and among the plurality of second protrusions, protrusions having high protruding portions in the width direction central portions and protrusions having low protruding portions in the width direction central portions can be mixed. Also, among the first protruding portions and the second protruding portions that are arranged in proximity to each other to constitute a group, the arrangement of the high protruding portions and the low protruding portions is preferably different from each other, but can also be the same as each other.

[0108] The high protruding portions and the low protruding portions do not necessarily have to be provided in the width direction central portions and the width direction end portions of the protrusions, but can also be provided in the middle of the width direction. Also, the height of the protrusion is preferably gradually changed from the high protruding portion toward the low protruding portion, but can also be, for example, changed in stages. Also, in the case where the height of the protrusion is gradually changed from the high protruding portion toward the low protruding portion, the rate of change of the height can be constant, or can vary.

[0109] The inner fins of the third embodiment are brazed or the like to the top portions of the upper plate and the lower plate, but the joining of the top portions to the upper plate and the lower plate is not necessarily required, and, for example, the top portion can be overlapped in a non-adhered state with the upper plate and the lower plate, whereby a parallel flow path portion is simply constituted, or the top portion can be separated from the upper plate and the lower plate, and only one cooling flow path can be formed on each of the upper and lower sides of the inner fin. Also, the inner fin need only separate the upper and lower cooling flow paths, and is not limited to the zigzag plate shape shown in the third embodiment.

[0110] The cooling flow path need not necessarily have a plurality of parallel extensions, but can also be one. Also, the cooling flow path can extend in a straight line, can extend in a curved manner in the middle, or can extend in a curved manner as a whole.

[0111] The cooling target is not limited to the battery for the electric vehicle, and for example, can be a stationary type battery for industrial use or the like. In addition, for example, one battery pack can be arranged on one cooling surface of the cooling heat exchanger, or one battery pack can be arranged across a plurality of cooling heat exchangers.

Claims

1. A cooling heat exchanger (10, 50, 60) in which cooling flow paths (18, 18a, 18b, 18c, 18d, 18e) in which a cooling medium flows are formed inside, and a cooling object overlapping a cooling surface (12) provided on a surface is cooled, wherein In a wall portion of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e), a first protrusion (36a, 54a, 70a) having a first inclined portion (38) extending obliquely from an upstream side to a downstream side as it goes to both sides in a width direction, and a second protrusion (36b, 54b, 70b) having a second inclined portion (40) extending obliquely from the downstream side to the upstream side as it goes to both sides in the width direction are arranged in the flow path length direction.

2. The cooling heat exchanger (10, 50, 60) according to claim 1, wherein The first protrusion (36a, 54a, 70a) and the second protrusion (36b, 54b, 70b) are alternately arranged in the flow path length direction of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e).

3. The cooling heat exchanger (50, 60) according to claim 1 or 2, wherein The first protrusion (54a, 70a) and the second protrusion (54b, 70b) each have a low protrusion portion (58) having a low height and a high protrusion portion (56) having a high height.

4. The cooling heat exchanger (50) according to claim 3, wherein A central portion in the flow path width direction of the first protrusion (54a) is formed as the high protrusion portion (56) or the low protrusion portion (58), and both end portions of the first protrusion (54a) are formed as the low protrusion portion (58) or the high protrusion portion (56), and a central portion in the flow path width direction of the second protrusion (54b) is formed as the low protrusion portion (58) or the high protrusion portion (56), and both end portions of the second protrusion (54b) are formed as the high protrusion portion (56) or the low protrusion portion (58).

5. The cooling heat exchanger (60) according to claim 3, wherein The first protrusion (70a) and the second protrusion (70b) gradually change in height from the low protrusion portion (58) toward the high protrusion portion (56).

6. The cooling heat exchanger (10, 50, 60) according to claim 1 or 2, wherein The cooling heat exchanger (10, 50, 60) has a plurality of the cooling flow paths (18, 18a, 18b, 18c, 18d, 18e) arranged side by side to form a parallel flow path portion (32).

7. The cooling heat exchanger (10, 50, 60) according to claim 1 or 2, wherein The width dimension of the first protrusion (36a, 54a, 70a) and the second protrusion (36b, 54b, 70b) is formed to be 50% or more of the flow path width of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e).

8. The cooling heat exchanger (10, 50, 60) according to claim 1 or 2, wherein The first protrusion (36a, 54a, 70a) and the second protrusion (36b, 54b, 70b) are continuously arranged in the entire flow path width direction of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e) and are continuously connected to the side wall of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e).

9. The cooling heat exchanger (10, 50, 60) according to claim 1 or 2, wherein A width direction center of the first protrusion (36a, 54a, 70a) overlaps with the second protrusion (36b, 54b, 70b) in a projection of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e) in a flow path length direction, and a width direction center of the second protrusion (36b, 54b, 70b) overlaps with the first protrusion (36a, 54a, 70a) in the projection of the cooling flow path (18, 18a, 18b, 18c, 18d, 18e) in the flow path length direction.

Images