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A cooling structure includes a plurality of plate-shaped heat generating members such as battery parts, DC voltage converters and electrical member (e.g., relay). In the cooling structure, the heat generating members are arranged in a plate-thickness direction to have predetermined spaces for formin

A cooling structure includes a plurality of plate-shaped heat generating members such as battery parts, DC voltage converters and electrical member (e.g., relay). In the cooling structure, the heat generating members are arranged in a plate-thickness direction to have predetermined spaces for forming fluid passages each of which is provided between adjacent heat generating members, and the fluid passages are provided to pass a fluid for cooling the heat generating members. Accordingly, all the heat generating members can be effectively cooled while the cooling structure can be made compact.

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What is claimed is: 1. A cooling structure for a device mounted to a vehicle, the cooling structure comprising: a plurality of heat generating members, each of the plurality of heat generating members having a plate shape, wherein the heat generating members are arranged in a plate-thickness direct

What is claimed is: 1. A cooling structure for a device mounted to a vehicle, the cooling structure comprising: a plurality of heat generating members, each of the plurality of heat generating members having a plate shape, wherein the heat generating members are arranged in a plate-thickness direction to have predetermined spaces between adjacent heat generating members for forming fluid passages, each fluid passage being disposed between the adjacent heat generating members; the fluid passages pass a fluid for cooling the heat generating members; the plurality of heat generating members include a plurality of first members and a plurality of second members, the plurality of second members having a control temperature higher than a control temperature of the plurality of first members; the fluid passages include a plurality of first passages disposed between adjacent first members and a plurality of second passages disposed between adjacent second members; a total number of the plurality of second passages is smaller than a total number of the plurality of first passages; all fluid having passed through the plurality of first passages flows through the plurality of second passages; and a total passage sectional area of the plurality of second passages between the adjacent second members is smaller than a total passage sectional area of the plurality of first passages between the adjacent first members. 2. The cooling structure according to claim 1, further comprising a case in which all the heat generating members are accommodated. 3. The cooling structure according to claim 1, wherein: the heat generating members include at least first and second different heat generating members which have approximately equal plate surfaces. 4. The cooling structure according to claim 1, wherein: the heat generating members include at least a first heat generating member operated to be lower than a first control temperature, and a second heat generating member operated to be lower than a second control temperature higher than the first control temperature. 5. The cooling structure according to claim 4, further comprising a thermal insulating member arranged between the first heat generating member and the second heat generating member. 6. The cooling structure according to claim 4, wherein the second heat generating member is arranged downstream from the first heat generating member in a flow direction of the fluid. 7. The cooling structure according to claim 4, wherein the first heat generating member is a battery part, the second heat generating member is a DC voltage converter, and the fluid is water. 8. The cooling structure according to claim 7, further comprising a radiator which is disposed to heat a seat of the vehicle using water from the fluid passages as a heat source. 9. The cooling structure according to claim 4, wherein the first heat generating member is a battery part, the second heat generating member is a DC voltage converter, and the fluid is air. 10. The cooling structure according to claim 9, wherein the fluid is air inside a passenger compartment of a vehicle. 11. The cooling structure according to claim 4, wherein the fluid is water, the cooling structure further comprising means for switching fluid passages such that water, heated by the first heat generating member and the second heat generating member to a predetermined temperature, flows into an engine cooling water circuit for cooling a vehicle engine. 12. The cooling structure according to claim 4, wherein the fluid is water, the cooling structure further comprising means for switching fluid passages such that water heated by the second heat generating member directly returns to the first heat generating member. 13. The cooling structure according to claim 1, wherein: the plurality of first members operate to be lower than a first control temperature, and the plurality of second members operate to be lower than a second control temperature higher than the first control temperature. 14. The cooling structure according to claim 1, wherein the plurality of first members operate to be lower than a first control temperature, and the plurality of second members operate to be lower than a second control temperature higher than the first control temperature, the cooling structure further comprising means for setting a flow speed of the fluid in the plurality of second passages between the second members to be higher than a flow speed of the fluid in the plurality of first passages between the first members. 15. The cooling structure according to claim 14, wherein the second members are arranged downstream from the first members in a flow direction of the fluid. 16. The cooling structure according to claim 14, wherein a total passage sectional area of the plurality of second passages between the second members is smaller than a total passage sectional area of the plurality of first passages between the first members. 17. The cooling structure according to claim 1, wherein the fluid flowing through the fluid passages is water, the cooling structure further comprising at least one of a radiator arranged in a water circuit, for cooling the water flowing to the fluid passage by performing heat exchange with air, and a water-refrigerant heat exchanger for cooling water flowing to the fluid passages by performing heat exchange with refrigerant in a refrigerant cycle. 18. The cooling structure according to claim 1, further comprising a case for accommodating the heat generating members, wherein the case is located under a seat of the vehicle. 19. The cooling structure according to claim 1, wherein: the heat generating members are stacked and accommodated in one case, the cooling structure further comprising first and second fluid passage portions provided at two end sides of the first and second passages to extend in a stacking direction of the heat generating members, and the first and second members are disposed between the first and second passage portions. 20. The cooling structure according to claim 1, wherein: the first and second passages are configured such that a flow amount of the fluid flowing through each second passage is larger than a flow amount of the fluid flowing through each first passage. 21. The cooling structure according to claim 1, wherein each of the fluid passages is disposed between opposing surfaces of the adjacent heat generating members and the fluid passages pass the fluid along an entire length of the opposing surfaces of the adjacent heat generating members. 22. The cooling structure according to claim 1, wherein: the plurality of first members are stacked and arranged in a first case and the plurality of second members are stacked and arranged in a second case separate from the first case; a first inlet passage portion is provided at a first end portion of the first case and an outlet passage portion is provided at a second end portion of the first case which is opposite to the first end portion of the first case; a second inlet passage portion is provided at a first end portion of the second case and an intermediate passage portion is provided at a second end portion of the second case which is opposite to the first end portion of the second case; and the first inlet passage portion is connected to the second inlet passage portion via a first connection hose and the outlet passage portion is connected to the intermediate passage portion via a second connection hose. 23. The cooling structure according to claim 22, wherein the first inlet passage portion, the outlet passage portion, the second inlet passage portion and the intermediate passage portion are provided at end sides of the plurality of fluid passages. 24. A cooling structure for a device mounted to a vehicle, the cooling structure comprising: a plurality of heat generating members, each of the plurality of heat generating members having a plate shape; and a plurality of heat-exchanging plate members arranged to have a plurality of receiving spaces for receiving the heat generating members and a plurality of fluid passages through which a fluid flows, wherein the heat generating members are located in the receiving spaces to be cooled by the fluid flowing through the fluid passages from two sides of each heat generating member through the heat-exchanging plate members; the plurality of heat generating members include a plurality of first members and a plurality of second members, the plurality of second members having a control temperature higher than a control temperature of the plurality of first members; the plurality of fluid passages include a plurality of first passages disposed between adjacent first members and a plurality of second passages disposed between adjacent second members; a total number of the plurality of second passages is smaller than a total number of the plurality of first passages; all fluid having passed through the plurality of first passages flows through the plurality of second passages; and a total passage sectional area of the plurality of second passages between the adjacent second members is smaller than a total passage sectional area of the plurality of first passages between the adjacent first members. 25. The cooling structure according to claim 24, further comprising an electrical insulating member inserted between adjacent two of the heat generating members and the heat-exchanging plate members, wherein the heat generating members are electrical members. 26. The cooling structure according to claim 24, further comprising a spring member which is disposed to generate a spring force in a direction for press-contacting the heat generating members and the heat-exchanging plate members to each other. 27. The cooling structure according to claim 24, further comprising a case in which all the heat generating members are accommodated. 28. The cooling structure according to claim 24, wherein: the heat generating members include at least first and second different heat generating members which have approximately equal plate surfaces. 29. The cooling structure according to claim 24, wherein: the heat generating members include at least a first heat generating member operated to be lower than a first control temperature, and a second heat generating member operated to be lower than a second control temperature higher than the first control temperature. 30. The cooling structure according to claim 29, further comprising a thermal insulating member arranged between the first heat generating member and the second heat generating member. 31. The cooling structure according to claim 29, wherein the second heat generating member is arranged downstream from the first heat generating member in a flow direction of the fluid. 32. The cooling structure according to claim 29, wherein the first heat generating member is a battery part, the second heat generating member is a DC voltage converter, and the fluid is water. 33. The cooling structure according to claim 32, further comprising a radiator which is disposed to heat a seat of the vehicle using the water from the fluid passages as a heat source. 34. The cooling structure according to claim 29, wherein the first heat generating member is a battery part, the second heat generating member is a DC voltage converter, and the fluid is air. 35. The cooling structure according to claim 34, wherein the fluid is air inside a passenger compartment of the vehicle. 36. The cooling structure according to claim 29, wherein the fluid is water, the cooling structure further comprising means for switching fluid passage such that water, heated by the first heat generating member and the second heat generating member to a predetermined temperature flows, into an engine cooling water circuit for cooling a vehicle engine. 37. The cooling structure according to claim 29, wherein the fluid is water, the cooling structure further comprising means for switching fluid passages such that water heated by the second heat generating member directly returns to the first heat generating member. 38. The cooling structure according to claim 24, wherein: the plurality of first members operate to be lower than a first control temperature, and the plurality of second members operate to be lower than a second control temperature higher than the first control temperature. 39. The cooling structure according to claim 24, wherein the plurality of first members operate to be lower than a first control temperature, and the plurality of second members operate to be lower than a second control temperature higher than the first control temperature, the cooling structure further comprising means for setting a flow speed of the fluid in the plurality of second passages between the second heat generating members to be higher than a flow speed of the fluid in the plurality of first passages between the first heat generating members. 40. The cooling structure according to claim 39, wherein the second members are arranged downstream from the first members in a flow direction of the fluid. 41. The cooling structure according to claim 39, wherein a total passage sectional area of the plurality of second passages between the second members is smaller than a total passage sectional area of the plurality of first passages between the first members. 42. The cooling structure according to claim 24, wherein the fluid flowing through the fluid passages is water, the cooling structure further comprising at least one of a radiator arranged in a water circuit, for cooling the water flowing to the fluid passage by performing heat exchange with air, and a water-refrigerant heat exchanger for cooling water flowing to the fluid passages by performing heat exchange with refrigerant in a refrigerant cycle. 43. The cooling structure according to claim 24, further comprising a case for accommodating the heat generating members, wherein the case is located under a seat of the vehicle. 44. The cooling structure according to claim 24, wherein: the heat generating members are stacked and accommodated in one case, the cooling structure further comprising first and second fluid passage portions provided at two end sides of the first and second passages to extend in a stacking direction of the heat generating members, and the first and second members are disposed between the first and second passage portions. 45. The cooling structure according to claim 24, wherein: the first and second passages are configured such that a flow amount of the fluid flowing through each second passage is larger than a flow amount of the fluid flowing through each first passage. 46. The cooling structure according to claim 24, wherein each of the fluid passages is disposed between opposing surfaces of the adjacent heat generating members and the fluid passages pass the fluid along an entire length of the opposing surfaces of the adjacent heat generating members. 47. The cooling structure according to claim 24, wherein: the plurality of first members are stacked and arranged in a first case and the plurality of second members are stacked and arranged in a second case separate from the first case; a first inlet passage portion is provided at a first end portion of the first case and an outlet passage portion is provided at a second end portion of the first case which is opposite to the first end portion of the first case; a second inlet passage portion is provided at a first end portion of the second case and an intermediate passage portion is provided at a second end portion of the second case which is opposite to the first end portion of the second case; and the first inlet passage portion is connected to the second inlet passage portion via a first connection hose and the outlet passage portion is connected to the intermediate passage portion via a second connection hose. 48. The cooling structure according to claim 47, wherein the first inlet passage portion, the outlet passage portion, the second inlet passage portion and the intermediate passage portion are provided at end sides of the plurality of fluid passages. 49. A cooling structure for a battery device of a vehicle, the cooling structure comprising: a plurality of first heat generating members accommodated in a first case and a second case which are separate from each other and are located under a seat of the vehicle; a plurality of second heat generating members adapted to have a control temperature higher than that of the first heat generating members, the second heat generating members being located only in the second casing; a plurality of first fluid passages each of which is provided between adjacent first heat generating members, and a plurality of second fluid passages each of which is provided between adjacent second heat generating members; a coolant circuit in which the first and second fluid passages are provided, the coolant circuit being coupled to an engine coolant circuit of the vehicle; a heat exchanger configured to cool the coolant by using a refrigerant cycle located in the vehicle; a total number of the second fluid passages is smaller than a total number of the first fluid passages; and the second fluid passages are provided such that the coolant having passed through the first fluid passages flows through the second fluid passages; and a total passage sectional area of the plurality of second passages between the adjacent second heat generating members is smaller than a total passage sectional area of the plurality of first passages between the adjacent first heat generating members. 50. The cooling structure according to claim 49, wherein: the plurality of first heat exchanging members are stacked and arranged in a first case and the plurality of second heat exchanging members are stacked and arranged in a second case separate from the first case; a first inlet passage portion is provided at a first end portion of the first case and an outlet passage portion is provided at a second end portion of the first case which is opposite to the first end portion of the first case; a second inlet passage portion is provided at a first end portion of the second case and an intermediate passage portion is provided at a second end portion of the second case which is opposite to the first end portion of the second case; and the first inlet passage portion is connected to the second inlet passage portion via a first connection hose and the outlet passage portion is connected to the intermediate passage portion via a second connection hose. 51. The cooling structure according to claim 50, wherein the first inlet passage portion, the outlet passage portion, the second inlet passage portion and the intermediate passage portion are provided at end sides of the plurality of fluid passages.