Heat exchanger

Abstract

To provide a heat exchanger having a novel structure in which a lower plate and an upper plate are stably and appropriately brazed at their outer peripheries. [Solution] A heat exchanger 10 has a flow path 46 inside through which a heat exchange fluid flows, and cools and / or heats a temperature-adjusted object 50 by heat exchange with the heat exchange fluid flowing through the flow path 46, in which a lower plate 12 having a recess 16 forming the flow path 46 formed in its inner circumferential portion and an upper plate 14 having a heat exchange surface 36 for the temperature-adjusted object 50 are stacked together, and the outer circumferential portions of the lower plate 12 and the upper plate 14 are provided with outer circumferential fixing portions 40a, 40b that are fixed to each other by brazing, and outer circumferential separation portions 30a, 30b that are spaced apart from each other are provided on the outer circumferential side of the outer circumferential fixing portions 40a, 40b on the lower plate 12 and the upper plate 14.

Description

[Technical field]

[0001] The present invention relates to a heat exchanger for use in cooling and / or heating, for example, a battery of an electric vehicle. [Background technology]

[0002] Conventionally, heat exchangers used for cooling and / or heating batteries of electric vehicles have been known. The heat exchanger has a structure in which a press-formed member having a groove formed therein and a flat-shaped flow path upper cover overlapped on the press-formed member so as to cover the groove are fixed to each other by brazing, as in the cooling structure disclosed in Japanese Patent No. 7553866 (Patent Document 1). Then, a coolant flows through a flow path formed by utilizing the groove between the press-formed member and the flow path upper cover, and heat exchange occurs between the coolant and a battery pack overlapped on the cooling surface of the flow path upper cover, thereby cooling the battery pack. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7553866 Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Document 1, the press-formed lower plate and the upper flow path cover are brazed and fixed to each other by heating a brazing material arranged between the overlapping surfaces of the press-formed lower plate and the upper flow path cover. In Patent Document 1, the outer peripheral end is brazed over the entire circumference, and the inner peripheral portion is brazed at the side wall of the flow path.

[0005] However, in the structure of Patent Document 1, the press-formed member and the flow path upper cover are continuous with the inner peripheral side of the brazed portion at the outer peripheral end, while the outer peripheral side is open, and the structures of the inner peripheral side and the outer peripheral side are different. Therefore, the heating state is likely to differ between the inner peripheral part and the outer peripheral part of the brazed portion at the outer peripheral end, and uneven brazing caused by insufficient heating or excessive heating of the brazing material may cause problems such as variations in the fixing strength between the press-formed member and the flow path upper cover.

[0006] An object of the present invention is to provide a heat exchanger having a novel structure in which a lower plate and an upper plate are stably and appropriately brazed at their outer peripheries. [Means for solving the problem]

[0007] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely examples and may be combined with one another as appropriate, and the multiple components described in each embodiment may be recognized and used independently as far as possible, and may also be combined with any of the components described in another embodiment as appropriate. As a result, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0008] The first aspect is a heat exchanger having a flow path inside through which a heat exchange fluid flows, and cooling and / or heating an object to be temperature-adjusted by heat exchange with the heat exchange fluid flowing through the flow path, in which a lower plate having a recess formed in its inner circumferential portion that constitutes the flow path and an upper plate having a heat exchange surface for the object to be temperature-adjusted are superimposed on each other, and an outer circumferential fixing portion is provided on the outer circumferential portions of the lower plate and the upper plate, which are fixed to each other by brazing, and an outer circumferential separation portion is provided on the lower plate and the upper plate outer circumferential side of the outer circumferential fixing portion, which separates them from each other.

[0009] In the heat exchanger constructed according to this aspect, a recess is provided on the inner peripheral side of the outer peripheral fixing portion of the lower plate, and an outer peripheral separating portion is provided on the outer peripheral side of the outer peripheral fixing portion, so that the lower plate and the upper plate are separated from each other on both the inner peripheral side and the outer peripheral side of the outer peripheral fixing portion. This reduces the difference in heating and heat dissipation between the inner peripheral side and the outer peripheral side of the outer peripheral fixing portion, and suppresses the temperature difference between the inner peripheral portion and the outer peripheral portion of the outer peripheral fixing portion, allowing the entire outer peripheral fixing portion to be stably brazed.

[0010] In addition, since the lower plate and the upper plate are separated from each other at their outer peripheral ends, the bending rigidity in the thickness direction of the heat exchanger, which is shaped like a flat plate overall, can be increased compared to a case in which the lower plate and the upper plate are overlapped with each other at their outer peripheral ends.

[0011] In a second aspect, in the heat exchanger described in the first aspect, the outer peripheral separation portion of the lower plate has a protruding portion protruding from the outer peripheral fixing portion in a direction away from the upper plate, and a flange-shaped portion protruding toward the outer periphery is provided on the protruding tip side of the protruding portion in the outer peripheral separation portion.

[0012] With a heat exchanger constructed in accordance with this embodiment, the difference in shape between the inner and outer circumferential sides of the outer circumferential fixing portion of the lower plate can be reduced over a wider range, which makes it possible to more advantageously equalize the temperature between the inner and outer circumferential portions of the outer circumferential fixing portion during brazing.

[0013] A third aspect is the heat exchanger according to the first or second aspect, wherein the outer circumferential fixing portion has a flat plate shape.

[0014] In the heat exchanger constructed according to this aspect, the outer peripheral fixing portion has a flat shape, which makes it easier to ensure a large brazing area between the lower plate and the upper plate. Also, when the outer peripheral fixing portion is brazed, the lower plate and the upper plate are less likely to become misaligned.

[0015] A fourth aspect is the heat exchanger according to any one of the first to third aspects, wherein the lower plate is a plate-like member having a substantially constant thickness.

[0016] In a heat exchanger constructed according to the present embodiment, the lower plate is a plate-shaped member of approximately constant thickness, so that the lower plate having a recess formed therein can be easily manufactured by, for example, pressing a plate material. Effect of the Invention

[0017] According to the present invention, it is possible to provide a heat exchanger in which the lower plate and the upper plate are stably and appropriately brazed at their outer periphery portions. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is an exploded perspective view showing a heat exchanger according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a plan view of a lower plate constituting the heat exchanger shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the heat exchanger shown in FIG. 1, which corresponds to the cross section III-III of FIG. 2. [Figure 4] IV-IV cross section of Figure 3 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] 1 to 4 show a heat exchanger 10 according to a first embodiment of the present invention. The heat exchanger 10 has a structure in which a lower plate 12 and an upper plate 14 are overlapped and fixed to each other. In the following description, in principle, the up-down direction refers to the up-down direction on the paper in Fig. 3, which is the overlapping direction of the lower plate 12 and the upper plate 14, the left-right direction refers to the left-right direction on the paper in Fig. 3, which is the length direction of a flow path 46 described later, and the front-rear direction refers to the up-down direction on the paper in Fig. 2, which is the width direction of the flow path 46 described later.

[0021] The lower plate 12 is preferably made of a synthetic resin mixed with a metal or a heat conductive filler. The lower plate 12 is made of, for example, an aluminum alloy or stainless steel, and in this embodiment, the lower plate 12 is made of an aluminum alloy to reduce weight. The lower plate 12 is a plate-like member having a substantially uniform thickness as a whole, and in this embodiment, is a pressed metal fitting. The lower plate 12 has a recess 16 that opens on the upper surface. The peripheral wall of the recess 16 is formed of an outer peripheral wall portion 18 that extends continuously around the entire outer periphery of the lower plate 12 and protrudes upward.

[0022] The recess 16 of the lower plate 12 is provided with a partition wall portion 20 that protrudes upward from the bottom wall portion. The partition wall portion 20 extends linearly in the left-right direction, and a plurality of partition wall portions (four in this embodiment) are provided in parallel and spaced apart from each other in the front-rear direction. The left and right ends of the partition wall portion 20 do not reach the outer peripheral wall portion 18, and are spaced apart inward in the left-right direction from both left and right sides of the outer peripheral wall portion 18. By forming such a plurality of partition wall portions 20, the portions of the recess 16 located on the left and right outer sides of the partition wall portion 20 are made into junction portions 22, 22 that are continuous in the front-rear direction. The junction portions 22, 22 each have a through hole 24 that penetrates the bottom wall portion in the up-down direction. The positions of the through holes 24, 24 in the junction portions 22, 22 are not particularly limited, but in this embodiment, the through hole 24 of the left junction portion 22 and the through hole 24 of the right junction portion 22 are arranged in a diagonal direction of the lower plate 12.

[0023] Between the partition wall portions 20, 20 adjacent to each other in the front-rear direction in the recess 16 and between the outer peripheral wall portion 18 and the partition wall portion 20 adjacent to each other in the front-rear direction, a groove 26 extending linearly in the left-right direction is formed. A plurality of protrusions 28 are formed on the bottom wall portion of the groove 26 in the lower plate 12. The protrusions 28 are substantially V-shaped in the plan view of the lower plate 12 shown in FIG. 2, and extend obliquely to the right from the center in the front-rear width direction of the groove 26 to both sides. The protrusions 28 in this embodiment are provided over the entire width direction of the groove 26, and both ends in the front-rear direction are integrally connected to the side wall portion of the groove 26. In this embodiment, the protrusions 28 are not provided on the left portion of the groove 26, but only on the right portion. The bottom wall of groove 26 widens approximately perpendicular to the vertical direction in the right side portion where protrusion 28 is formed, and inclines upward toward the right side in the left side portion where protrusion 28 is not formed, so that the depth of the left side portion of groove 26 becomes shallower toward the right side. Therefore, left junction 22 provided contiguous to the left end of groove 26 is deeper in the vertical direction than right junction 22 provided contiguous to the right end of groove 26.

[0024] As shown enlarged in Figs. 3 and 4, the outer peripheral wall 18 of the lower plate 12 is provided so as to protrude upward in a stepped manner from the bottom wall of the recess 16, and the protruding tip surface is an annular flat surface that extends continuously in the circumferential direction with a certain width dimension. A peripheral separation portion 30a that protrudes downward is provided on the outer peripheral side of the outer peripheral wall 18 of the lower plate 12. The peripheral separation portion 30a is provided so as to be spaced downward from the protruding tip surface (upper surface) of the outer peripheral wall 18. The peripheral separation portion 30a integrally includes a protruding portion 32 that protrudes downward from the outer peripheral end of the outer peripheral wall 18, and a flange-shaped portion 34 that protrudes from the lower end of the protruding portion 32 in a vertically perpendicular direction toward the outer periphery. The provision of such a peripheral separation portion 30a improves the deformation rigidity of the lower plate 12, which is a plate-shaped member.

[0025] The projection 32 of the outer circumferential spaced portion 30a has a shape that generally corresponds to a portion that connects the projection tip of the outer circumferential wall portion 18 and the bottom wall portion of the recess 16. Moreover, the flange-like portion 34 of the outer circumferential spaced portion 30a has a shape that generally corresponds to a portion that connects the outer circumferential wall portion 18 to the bottom wall portion of the recess 16. Therefore, the outer circumferential end portion of the lower plate 12 formed by the outer circumferential wall portion 18 and the outer circumferential spaced portion 30a has a cross-sectional shape in which the inner circumferential portion and the outer circumferential portion are generally symmetrical, as shown in Figures 3 and 4.

[0026] The partition wall portion 20 has a cross-sectional shape substantially the same as that of the outer peripheral end portion of the lower plate 12 constituted by the outer peripheral wall portion 18 and the outer peripheral separation portion 30a, and the front and rear portions have a cross-sectional shape substantially symmetrical. The protruding tip surface of the partition wall portion 20 and the protruding tip surface of the outer peripheral wall portion 18 are located on the same vertical orthogonal plane.

[0027] The upper plate 14 is made of a synthetic resin mixed with a metal or a heat conductive filler. The upper plate 14 is made of, for example, an aluminum alloy or stainless steel, and in this embodiment, the upper plate 14 is made of an aluminum alloy to reduce weight. The upper plate 14 has a substantially rectangular flat plate shape as shown in Fig. 1, and as shown in Figs. 3 and 4, the upper surface of the upper plate 14 is a heat exchange surface 36 that comes into contact with a battery pack 50, which will be described later.

[0028] As shown in Figs. 3 and 4, the upper plate 14 of this embodiment is a clad plate whose lower surface is made of a brazing material layer 38. The brazing material layer 38 is made of a material having a lower melting point than the lower plate 12 and the upper plate 14. For example, an alloy of iron, manganese, magnesium, and copper is preferably used, but it can be made of various conventionally known brazing materials. The brazing material layer 38 is desirably made of a low-melting-point brazing material having a melting point in the range of 520 to 580°C. If the brazing material layer 38 is made of a low-melting-point brazing material, the temperature range of the brazing material layer 38 that can be effectively brazed can be made wider, and the temperature variation during heating can be more widely tolerated. In addition, the heating temperature required for brazing is relatively low, so that damage to the lower plate 12 and the upper plate 14 due to heating can be prevented.

[0029] The upper plate 14 is overlapped on the upper surface of the lower plate 12, and covers the recess 16 of the lower plate 12. The outer peripheral wall portion 18 and the partition wall portion 20 of the lower plate 12 are overlapped with the upper plate 14 in abutting contact with each other, and are fixed to each other by brazing at the overlapping portions.

[0030] The heating method for melting the brazing material layer 38 during brazing is not particularly limited, and may be, for example, a conventionally known heating furnace such as a Nocolok furnace or induction heating using a heating coil. When brazing is performed using induction heating using a heating coil, the brazing material layer 38 itself may be induction heated, or the lower plate 12 and / or the upper plate 14 may be induction heated. Alternatively, for example, a conductive heat transfer member may be superimposed on at least one of the lower plate 12 and the upper plate 14, and the heat transfer member may be induction heated to heat the brazing material layer 38 by heat transferred from the heat transfer member. This eliminates the need to use a material with high induction heating efficiency for the lower plate 12 and the upper plate 14, and allows greater freedom in selecting the material for forming the lower plate 12 and the upper plate 14.

[0031] Thus, in this embodiment, the outer circumferential fixing portion 40a, which is the fixing portion on the lower plate 12 side by brazing, is formed by the outer circumferential wall portion 18 of the lower plate 12. Moreover, the outer circumferential fixing portion 40b, which is the fixing portion on the upper plate 14 side by brazing, is formed by an overlapping portion with the outer circumferential wall portion 18 of the upper plate 14. The outer circumferential fixing portions 40a, 40b in this embodiment extend in a substantially rectangular annular shape along the outer circumferential edges of the lower plate 12 and the upper plate 14.

[0032] In this embodiment, the inner circumferential fixing portion 42a, which is the portion fixed to the lower plate 12 by brazing, is formed by the partition wall portion 20 of the lower plate 12. Moreover, the inner circumferential fixing portion 42b, which is the portion fixed to the upper plate 14 by brazing, is formed by an overlapping portion with the partition wall portion 20 of the upper plate 14. In this embodiment, the inner circumferential fixing portions 42a, 42b extend linearly in the left-right direction.

[0033] The outer circumferential spaced portion 30a of the lower plate 12 protrudes from the outer circumferential fixed portion 40a in a direction in which the protruding portion 32 moves away from the upper plate 14, and is spaced downward from the outer circumferential end portion of the upper plate 14. As a result, the outer circumferential side of the outer circumferential fixed portion 40b on the upper plate 14 is the outer circumferential spaced portion 30b on the upper plate 14 side, which is spaced upward from the outer circumferential spaced portion 30a of the lower plate 12. The flange-shaped portion 34 of the outer circumferential spaced portion 30a of the lower plate 12 faces the outer circumferential spaced portion 30b of the upper plate 14 at a substantially constant distance and generally parallel to it.

[0034] The outer peripheral separation portion 30a is provided on the outer peripheral side of the outer peripheral fixing portion 40a in the lower plate 12, thereby reducing the difference in shape between the inner peripheral side and the outer peripheral side of the outer peripheral fixing portion 40a. Therefore, the outer peripheral fixing portion 40a of the lower plate 12 has a small difference in heating and heat dissipation between the inner peripheral portion and the outer peripheral portion, and the brazing material layer 38 can be melted over the entire overlapping portion with the outer peripheral fixing portion 40a, allowing the outer peripheral fixing portions 40a, 40b to be stably brazed.

[0035] In addition, since the outer peripheral separation portion 30a is provided in the lower plate 12, the outer peripheral fixing portion 40a and its adjacent portion and the inner peripheral fixing portion 42a and its adjacent portion have substantially the same cross-sectional shape. Therefore, the heating mode and heat dissipation mode of the outer peripheral fixing portion 40a and the inner peripheral fixing portion 42a are similar, and the outer peripheral fixing portion 40a and the inner peripheral fixing portion 42a can be brazed in the same manner. Since the lower plate 12 of this embodiment is a plate-like member having a substantially constant thickness overall, the difference in the heating mode and heat dissipation mode due to the difference in thickness between the outer peripheral fixing portion 40a and the inner peripheral fixing portion 42a is also reduced.

[0036] The upper plate 14 is provided with the outer peripheral separation portion 30b on the outer peripheral side of the outer peripheral fixing portion 40b, thereby reducing the difference in shape between the inner peripheral side and the outer peripheral side of the outer peripheral fixing portion 40b. Therefore, the outer peripheral fixing portion 40b of the upper plate 14 has a small difference in heating and heat dissipation between the inner peripheral portion and the outer peripheral portion, and the components of the outer peripheral fixing portion 40b in the brazing material layer 38 can be melted throughout, allowing the outer peripheral fixing portions 40a, 40b to be stably brazed.

[0037] The outer peripheral fixing portion 40b of the upper plate 14 has a flat plate shape extending generally perpendicular to the vertical direction, and is brazed by being pressed in the vertical direction against the outer peripheral fixing portion 40a of the lower plate 12 extending generally perpendicular to the vertical direction. Therefore, during brazing, the outer peripheral fixing portion 40a of the lower plate 12 and the outer peripheral fixing portion 40b of the upper plate 14 can be easily pressed against each other, and misalignment due to sliding between the lower plate 12 and the upper plate 14 is unlikely to occur.

[0038] In addition, since the upper plate 14 of this embodiment has a flat shape overall, the vicinity of the outer circumferential fixing portion 40b and the vicinity of the inner circumferential fixing portion 42b have substantially the same cross-sectional shape. Therefore, the heating and heat dissipation modes of the outer circumferential fixing portion 40b and the inner circumferential fixing portion 42b are similar, and the outer circumferential fixing portion 40b and the inner circumferential fixing portion 42b can be brazed in the same manner.

[0039] The outer peripheral fixing portion 40a of the lower plate 12 and the outer peripheral fixing portion 40b of the upper plate 14 are brazed to form a fluid sealing region 44 separated from the outside by utilizing the recess 16. The left and right intermediate portion of the fluid sealing region 44 is formed as a parallel flow passage portion 48 in which a plurality of flow passages 46 formed by utilizing the recessed grooves 26 are arranged in parallel in the flow passage width direction by brazing the inner peripheral fixing portion 42a of the lower plate 12 and the inner peripheral fixing portion 42b of the upper plate 14. The plurality of flow passages 46 in the parallel flow passage portion 48 are partitioned by the partition wall portion 20 constituting the inner peripheral fixing portion 42a. The walls of the flow passages 46 located at both front and rear ends of the parallel flow passage portion 48 are formed by the partition wall portion 20 constituting the inner peripheral fixing portion 42a and the outer peripheral wall portion 18 constituting the outer peripheral fixing portion 40a.

[0040] The heat exchanger 10, which is constructed by brazing the lower plate 12 and the upper plate 14, has left and right through-holes 24, 24 connected to an external circuit (not shown). A heat exchange fluid such as water is supplied from the external circuit to the fluid-filled region 44 through the left through-hole 24, and the heat exchange fluid is discharged from the fluid-filled region 44 to the external circuit through the right through-hole 24. This allows the heat exchange fluid to flow through the flow path 46 from left to right. The heat exchange fluid has its temperature adjusted in the external circuit, and adjusts the temperature of the upper plate 14 by flowing through the flow path 46 while in contact with the upper plate 14.

[0041] 4, a battery pack 50 as a temperature adjustment target is attached to the heat exchange surface 36 of the upper plate 14 in the heat exchanger 10, and the temperature of the battery pack 50 is adjusted by heat exchange between the upper plate 14, which is cooled or heated by the heat exchange fluid, and the battery pack 50. In short, heat exchange occurs via the upper plate 14 between the heat exchange fluid flowing through the flow path 46 and the battery pack 50, and the battery pack 50 is cooled and / or heated.

[0042] In the upstream portion of the flow path 46, the flow path cross-sectional area becomes smaller toward the downstream. In addition, the downstream portion of the flow path 46 is provided with the protrusions 28, and the heat exchange fluid flowing through the flow path 46 is agitated by the protrusions 28, thereby reducing the temperature difference of the heat exchange fluid in the flow path depth direction. As a result, in the heat exchanger 10, the temperature difference between the heat exchange fluid and the battery pack 50 is sufficiently large even in the downstream portion of the flow path 46, and the heat exchanger 10 exhibits effective cooling / heating performance for the battery pack 50.

[0043] In this embodiment, the battery pack 50 overlaps the heat exchange surface 36 of the upper plate 14 in direct contact therewith, but for example, a heat-conductive heat-conductive sheet or heat-conductive gel may be interposed between the battery pack 50 and the heat exchange surface 36 of the upper plate 14, so that the battery pack 50 and the heat exchange surface 36 of the upper plate 14 are in indirect contact with each other via the heat-conductive sheet or the like. By providing such a heat-conductive sheet or the like, the slight gap between the battery pack 50 and the upper plate 14 is filled with the heat-conductive sheet or the like, thereby improving the heat exchange efficiency.

[0044] The heat exchanger 10 of the present embodiment functions as a heating device that increases the temperature of the battery pack 50 by flowing a heat exchange fluid having a higher temperature than the battery pack 50 through the flow path 46, while it functions as a cooling device that decreases the temperature of the battery pack 50 by flowing a heat exchange fluid having a lower temperature than the battery pack 50 through the flow path 46. For example, the flow path 46 may be selectively connectable to an external circuit that supplies / discharges a high-temperature heat exchange fluid and an external circuit that supplies / discharges a low-temperature heat exchange fluid, and the heat exchanger 10 may selectively function as a heating device and a cooling device by switching the external circuit connected to the flow path 46. However, the heat exchanger 10 may only have the function as a cooler. In addition, the temperature adjustment target is not limited to the battery pack 50.

[0045] Although the embodiment of the present invention has been described in detail above, the present invention is not limited by the specific description. For example, the protrusions protruding from the bottom wall of the flow path are not essential to the present invention and can be omitted. In addition, when a protrusion is provided, the specific shape of the protrusion is not particularly limited, and it may be a shape extending linearly in the width direction of the flow path, a hemispherical shape, a frustum shape, or the like. The protrusion does not need to be provided over the entire width direction of the flow path, and may be provided only in the middle of the width direction of the flow path, or may be provided biased to one side of the width direction of the flow path. The protrusion may be provided over the entire length of the flow path, or may be provided partially in the length direction of the flow path. When multiple protrusions are provided, the protrusions may have different shapes (including sizes) and pitches in the length direction of the flow path.

[0046] In the first embodiment, a structure in which a plurality of flow paths 46 are provided in parallel in the parallel flow path section 48 has been shown, but for example, the parallel flow path section may be formed by the middle part of one flow path extending in a meandering shape. Also, for example, only one flow path extending linearly in one direction may be provided.

[0047] The outer circumferential fixing portion does not necessarily have to be continuous around the entire circumference. Specifically, for example, the lower plate and the upper plate may be partially separated in the circumferential direction, and a port or the like for connecting the flow path to an external circuit may be provided in the separated portion.

[0048] The upper plate is desirably flat to obtain a flat heat exchange surface, but may be provided with appropriate irregularities. Specifically, for example, the outer peripheral separation portion of the upper plate may be bent into a continuous groove shape over the entire circumference for the purpose of improving bending deformation rigidity, etc. In the lower plate, a partition wall portion (inner peripheral fixing portion) that separates the multiple flow paths is not essential. When the partition wall portion is not provided in the lower plate, only one flow path may be provided. Also, for example, a corrugated intermediate plate may be disposed between the lower plate and the upper plate, and the intermediate plate may be used to separate the fluid-filled region between the lower plate and the upper plate, thereby forming flow paths on the lower plate side and the upper plate side, respectively. In this case, in addition to the upper surface of the upper plate, the lower surface of the lower plate is also used as a heat exchange surface.

[0049] The brazing material is not necessarily limited to being integrally provided as a brazing material layer on the upper plate which is a clad plate, but may also be arranged, for example, as a separate body from the lower plate and the upper plate between the overlapping surfaces of the lower plate and the upper plate. [Explanation of symbols]

[0050] 10 Heat exchanger (first embodiment) 12 Lower plate 14 Upper plate 16 Recess 18 Outer wall 20 Partition wall 22 Junction 24 Through hole 26 Groove 28 Protrusion 30a,30b outer peripheral separation part 32 Protrusion 34 Flange-shaped part 36 Heat exchange surface 38 Brazing layer 40a,40b Outer fixed part 42a, 42b Inner peripheral fixing portion 44 Fluid-filled area 46 Flow Path 48 Parallel flow path section 50 Battery Pack

Claims

1. A heat exchanger having a flow path through which a heat exchange fluid flows, and cooling and / or heating a temperature control target by heat exchange with the heat exchange fluid flowing through the flow path, a lower plate having a recess formed in an inner circumferential portion thereof that constitutes the flow path, and an upper plate having a heat exchange surface for the temperature adjustment target, the lower plate and the upper plate being overlapped with each other; an outer circumferential fastening portion is provided at an outer circumferential portion of the lower plate and the upper plate, the outer circumferential portion being fastened to each other by brazing; The lower plate and the upper plate are provided with outer circumferential spacing portions spaced apart from each other on the outer circumferential side of the outer circumferential fixed portion.

2. the outer circumferential separation portion of the lower plate includes a protruding portion protruding from the outer circumferential fixing portion in a direction away from the upper plate, 2. The heat exchanger according to claim 1, wherein a flange-shaped portion protruding toward the outer periphery is provided on a protruding tip side of the protruding portion in the outer periphery separation portion.

3. 3. The heat exchanger according to claim 1, wherein the outer peripheral fixing portion has a flat plate shape.

4. 3. The heat exchanger according to claim 1, wherein the lower plate is a plate-like member having a substantially constant thickness.

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