Tank for vehicle and method for manufacturing tank for vehicle

Abstract

To provide a temperature control system of a vehicle which suppresses increase of an installation space caused by interspersion of components.SOLUTION: A vehicle tank is given in which a temperature control system adjusts temperature of an object for temperature control mounted on a vehicle through temperature control liquid. The vehicle tank comprises: a container part which is a bottomed cylindrical shape with an opening end part that opens toward an upper direction to store the temperature control liquid; a lid part which is fixed to the opening end part to cover the opening of the opening end part and includes a replenishing port where the temperature control liquid is replenished from outside into the container; a heat accumulation layer which is formed by a heat storage material to surround the container; a heat insulation layer which is formed by a heat insulator to surround the container at outer side of the heat accumulation layer. A pump sending out the temperature control liquid in the container into a flow channel and a temperature control part adjusting temperature of the temperature control liquid flowing in the flow channel are fixed on the lid part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a tank for a vehicle and a method for manufacturing a tank for a vehicle. [Background technology]

[0002] Regarding a vehicle tank provided in a vehicle temperature control system, Patent Document 1 discloses a thermal insulation structure arranged in a flow path of engine coolant for an automobile. This thermal insulation structure keeps the liquid stored in a container of the thermal insulation structure warm by a heat storage material layer arranged around the outer periphery of the container and a convection prevention layer arranged outside the heat storage material layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-229841 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for further space-saving vehicle temperature control systems. Temperature control systems include various components for adjusting the temperature of a temperature-control liquid and supplying it to a temperature-control target. For example, if these components are scattered throughout the temperature control system, the installation space for the temperature control system may increase. However, Patent Document 1 does not specifically consider the placement of these components. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to a first aspect of the present disclosure, there is provided a vehicle tank included in a temperature control system that uses a temperature control liquid to control the temperature of a temperature-control object mounted on a vehicle. The vehicle tank includes a container portion having a bottomed cylindrical shape with an open end that opens upward and stores the temperature control liquid, a lid portion fixed to the open end to cover the opening of the open end and formed with a refill port for refilling the temperature control liquid from the outside into the container portion, a heat storage layer formed of a heat storage material and surrounding the container portion, and an insulating layer formed of an insulating material and surrounding the container portion outside the heat storage layer. A pump for sending the temperature control liquid in the container portion to a flow path and a temperature control unit for adjusting the temperature of the temperature control liquid flowing through the flow path are fixed to the lid portion. In this configuration, the pump and temperature control unit are fixed to the lid, not to the container surrounded by the heat storage layer and the heat insulating layer, so the pump and temperature control unit can be concentrated in the vehicle tank while ensuring the heat retention performance of the vehicle tank, thereby reducing the installation space for the temperature control system. (2) In the above embodiment, a valve for opening and closing the flow path may be further fixed to the lid portion. In this embodiment, more valves can be integrated into the vehicle tank. (3) In the above embodiment, a heat-shielding layer may be provided that is made of a heat-shielding material and surrounds the container portion outside the heat-insulating layer. In this embodiment, the temperature-regulating liquid in the container portion can be kept warm with high efficiency by the heat storage layer, the heat-insulating layer, and the heat-insulating layer. (4) In the above embodiment, the heat storage material may be made of paraffin wax, the heat insulating material may be made of polyethylene foam, and the heat shielding material may be made of aluminum. In this embodiment, the temperature control liquid in the container can be kept warm more efficiently. (5) According to a second aspect of the present disclosure, there is provided a method for manufacturing a tank for a vehicle, which is provided in a temperature control system that adjusts the temperature of a temperature-control object mounted on a vehicle using a temperature control liquid. This method of manufacturing a vehicle tank includes a first step of preparing a first tank having a bottomed cylindrical shape with a first open end and storing the temperature regulating liquid, a second tank having a bottomed cylindrical shape with a second open end and surrounded by a heat insulating layer having a heat insulating material, and a lid member formed with a refill port for refilling the temperature regulating liquid into the first tank; a second step of fixing the first open end and the second open end to the lid member so that the first tank is accommodated in the second tank with a gap formed between them and the second tank, and so that the openings of the first open end and the second open end are covered by the lid member; a third step of injecting a heat storage material that stores heat by latent heat and that is liquefied by heating to a temperature equal to or higher than its melting point, into the gap through an inlet formed in the lid member, thereby surrounding the first tank with the heat storage material; and a fourth step of closing the inlet after the third step. Tank 1 and a fifth step of fixing a pump for sending the temperature control liquid inside to the outside and a temperature control unit for adjusting the temperature of the temperature control liquid flowing through a flow path communicating with the pump.

[0007] The present disclosure can be realized in various forms other than the above-described form as a vehicle tank, such as a temperature control system or a vehicle equipped with a vehicle tank. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram showing a schematic configuration of a temperature adjustment system according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of a tank in the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 1 is a process diagram of a method for manufacturing a tank. [Figure 5] FIG. 10 is a perspective view showing how the tank is manufactured. [Figure 6]10A and 10B are cross-sectional views showing how the tank is manufactured. [Figure 7] FIG. 10 is a first explanatory diagram showing the results of a comparison test. [Figure 8] FIG. 2 is a second explanatory diagram showing the results of the comparison test. DETAILED DESCRIPTION OF THE INVENTION

[0009] A. First embodiment: FIG. 1 is an explanatory diagram showing the schematic configuration of a temperature adjustment system 100 in a first embodiment. The temperature adjustment system 100 is provided in a vehicle Vc and adjusts the temperature of a temperature adjustment object mounted on the vehicle Vc using a temperature adjustment liquid Lq. The temperature adjustment liquid Lq refers to a liquid for adjusting the temperature of the temperature adjustment object. The temperature adjustment liquid Lq is also called a coolant.

[0010] In this embodiment, the vehicle Vc is configured as a BEV (Battery Electric Vehicle) powered by a drive battery. The temperature control objects in this embodiment are a battery pack BP having a drive battery configured as a lithium-ion battery and a heater core HC for heating provided in the HVAC (Heating, Ventilation, and Air Conditioning) system of the vehicle Vc. In other embodiments, the vehicle Vc may be, for example, a gasoline vehicle or a diesel vehicle, or may be an HEV (Hybrid Electric Vehicle), a PHEV (Plug-in Hybrid Electric Vehicle), or an FCV (Fuel Cell Vehicle). In other embodiments, the temperature control object may be, for example, a battery configured as a lead battery, or an engine, motor, inverter, control computer, or any other object mounted on the vehicle Vc.

[0011] The temperature control system 100 in this embodiment includes a tank 101 and a circulation circuit 150. The circulation circuit 150 has a flow path 151 through which the temperature control liquid Lq flows, and is configured to be able to circulate the temperature control liquid Lq between the tank 101 and the temperature control object. The flow path 151 is formed by a piping member such as a rubber hose. In FIG. 1, the flow of the temperature control liquid Lq in the circulation circuit 150 is schematically indicated by white arrows. Hereinafter, the tank 101 will also be referred to as a vehicle tank or a reserve tank.

[0012] The circulation circuit 150 has a pump 120, a heating unit 130, a cooling unit 140, a first valve 180, and a second valve 181. Piping members that form a flow path 151 are connected to each of these units. The operation of each of these units is controlled, for example, by a control computer provided in the vehicle Vc. In this embodiment, the pump 120, the heating unit 130, and the first valve 180 are disposed in the tank 101, as will be described later.

[0013] In this embodiment, of the flow path 151, a first flow path 152 connected to the downstream side of the pump 120 branches into a first branch flow path 161 and a second branch flow path 162 at a first branch point 170. The second branch flow path 162 further branches into a third branch flow path 163 and a fourth branch flow path 164 at a second branch point 171. The first branch flow path 161 and the third branch flow path 163 join at a joining point 172. The flow path 151 downstream of the joining point 172 is also referred to as a second flow path 153.

[0014] A cooling unit 140 that cools the temperature control liquid Lq flowing through the first branch flow path 161 is disposed in the first branch flow path 161. The cooling unit 140 is configured, for example, by a radiator or a chiller. A heating unit 130 that heats the temperature control liquid Lq flowing through the second branch flow path 162 is disposed in the second branch flow path 162. The heating unit 130 is configured, for example, by a heater or a heat exchanger. The heating unit 130 and the cooling unit 140 each function as a temperature adjustment unit that adjusts the temperature of the temperature control liquid Lq flowing through the flow path 151.

[0015] A first valve 180 is disposed at the first branch point 170. The first valve 180 is configured, for example, as an electrically operated switching valve, and switches between three states: a state in which only the first branch flow path 161 is open, a state in which only the second branch flow path 162 is open, and a state in which both the first branch flow path 161 and the second branch flow path 162 are open. The second valve 181 is configured, for example, as an electrically operated switching valve like the first valve 180, and switches between a state in which only the third branch flow path 163 is open, a state in which only the fourth branch flow path 164 is open, and a state in which both the third branch flow path 163 and the fourth branch flow path 164 are open. Hereinafter, valves that open and close the flow path 151, such as the first valve 180 and the second valve 181, will also be simply referred to as "valves."

[0016] In the circulation circuit 150, by opening the first branch flow path 161, the temperature control liquid Lq cooled by the cooling unit 140 can be supplied to the battery pack BP. This can lower the temperature of the battery pack BP. Furthermore, by opening the second branch flow path 162 and the third branch flow path 163, the temperature control liquid Lq heated by the heating unit 130 can be supplied to the battery pack BP. This can raise the temperature of the battery pack BP. Furthermore, by opening the second branch flow path 162 and the fourth branch flow path 164, the temperature control liquid Lq heated by the heating unit 130 can be supplied to the heater core HC. This can raise the temperature of the heater core HC. In this way, in the circulation circuit 150, the temperature control liquid Lq can be used to adjust the temperatures of the temperature control targets, the battery pack BP and the heater core HC.

[0017] FIG. 2 is a perspective view showing a schematic configuration of the tank 101 in the first embodiment. FIG. 2 shows arrows along the X, Y, and Z directions, which are perpendicular to each other. The X, Y, and Z directions are directions along the X, Y, and Z axes, which are three spatial axes perpendicular to each other, and each direction includes both a direction on one side of the X, Y, and Z axes and a direction opposite thereto. The X and Y axes are axes along a horizontal plane, and the Z axis is an axis along a vertical line. Arrows along the X, Y, and Z directions are also shown appropriately in other figures. The X, Y, and Z directions in FIG. 2 and the X, Y, and Z directions in other figures represent the same directions. Hereinafter, the +Z direction will also be referred to as "up" and the -Z direction will also be referred to as "down."

[0018] 2, the tank 101 includes a lower portion 102 and a lid portion 103. The lid portion 103 is also called an upper portion.

[0019] Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. As shown in Fig. 3, the lower section 102 includes a first tank 20, a heat storage layer 41, and a heat insulating layer 61. Furthermore, in this embodiment, the lower section 102 includes a heat shield layer 80.

[0020] The first tank 20 is configured as a container that stores the temperature control liquid Lq therein. The first tank 20 has a bottomed, cylindrical shape with a first open end 22 that opens upward. In this embodiment, the first tank 20 has a substantially rectangular parallelepiped outer shape. The first open end 22 has a flange-like shape. The first tank 20 is formed of, for example, polypropylene (PP) or glass fiber reinforced polypropylene (GFPP). Hereinafter, the first tank 20 will also be referred to as a container portion. The opening of the first open end 22 will also be referred to as a first opening 23. The first open end 22 will also be simply referred to as an open end.

[0021] The heat storage layer 41 is formed of a heat storage material and surrounds the periphery of the first tank 20. In this specification, "surrounding the periphery of the first tank 20" refers to surrounding the bottom and side surfaces of the first tank 20 from the outside. In this embodiment, the heat storage layer 41 is formed of a latent heat storage material, and uses the latent heat generated when the latent heat storage material changes phase at its melting point to keep the temperature control liquid Lq in the first tank 20 warm. More specifically, in this embodiment, the heat storage layer 41 is formed of paraffin wax and is formed between the first tank 20 and the second tank 40. The paraffin wax is prepared so that its melting point is, for example, 50°C to 60°C. Paraffin wax is a waxy solid at temperatures below its melting point, a liquid at temperatures above its melting point, and a mixture of solid and liquid at the melting point.

[0022] The heat insulating layer 61 is made of a heat insulating material and surrounds the first tank 20 on the outside of the heat storage layer 41. The heat insulating layer 61 insulates the temperature control liquid Lq stored in the first tank 20 from the outside by means of the heat insulating material. In this embodiment, the heat insulating layer 61 is made of foamed polyethylene and is formed between the second tank 40 and the third tank 60.

[0023] The second tank 40 has a bottomed cylindrical shape with a second open end 42 that opens upward. In this embodiment, the second tank 40 has a substantially rectangular parallelepiped outer shape. The second open end 42 has a flange shape. The opening of the second open end 42 is also referred to as the second opening 43. The opening areas of the second opening 43 in the X and Y directions are larger than the opening areas of the first opening 23 in the X and Y directions. The second tank 40 is formed of, for example, PP or GFPP, similar to the first tank 20.

[0024] The above-described first tank 20 is housed in the second tank 40 so that gaps are formed between the bottom of the first tank 20 and the bottom of the second tank 40, and between the side wall of the first tank 20 and the side wall of the second tank 40. This forms a space sp1 between the first tank 20 and the second tank 40. In this embodiment, paraffin wax is filled in this space sp1 as a heat storage material, thereby forming a heat storage layer 41.

[0025] The third tank 60 has a bottomed cylindrical shape with a third open end 62 that opens upward. In this embodiment, the third tank 60 has a substantially rectangular parallelepiped outer shape. The third open end 62 has a flange shape. The third open end 62 and the second open end 42 described above are formed so that the upper surface side of the third open end 62 and the lower surface side of the second open end 42 fit together with a claw. The opening of the third open end 62 is also referred to as the third opening 63. The opening areas of the third opening 63 in the X and Y directions are larger than the opening areas of the first opening 23 in the X and Y directions. The third tank 60 is formed, for example, from PP or GFPP, similar to the first tank 20.

[0026] The second tank 40 described above is housed in the third tank 60 with the lower surface of the second opening end 42 engaged with the upper surface of the third opening end 62 by claws, so that gaps are formed between the bottom of the second tank 40 and the bottom of the third tank 60, and between the side walls of the second tank 40 and the side walls of the third tank 60. This forms a space sp2 between the second tank 40 and the third tank 60. In this embodiment, foamed polyethylene is placed in this space sp2 as a heat insulating material, thereby forming a heat insulating layer 61.

[0027] The heat shield layer 80 is formed of a heat shielding material and is disposed on the outside of the heat insulating layer 61. In this embodiment, the heat shield layer 80 is formed of aluminum. More specifically, the heat shield layer 80 is formed of an aluminum film vapor-deposited on the outside of the bottom and sidewall of the third tank 60. In other embodiments, the heat shield layer 80 may be formed of, for example, aluminum foil attached to the outside of the bottom and sidewall of the third tank 60. The heat shield layer 80 reflects radiant heat from the temperature control liquid Lq in the first tank 20 back into the tank 101, thereby suppressing heat radiation from inside the tank 101 to outside the tank 101. The heat shielding material is also called a reflective material or a heat reflecting material.

[0028] The lid portion 103 is fixed to the first opening edge 22 and covers the first opening 23. In this embodiment, the lid portion 103 is further fixed to the second opening edge 42 and covers the second opening 43. The lid portion 103 is formed, for example, from PP or GFPP, similar to the first tank 20. In this embodiment, the lid portion 103 has a substantially flat plate shape. A first protrusion 104 and a second protrusion 105 protruding downward are provided on the lid portion 103 at positions corresponding to the first opening edge 22 and the second opening edge 42 in the X and Y directions, respectively. The lower portion of the first protrusion 104 and the upper portion of the first opening edge 22, and the lower portion of the second protrusion 105 and the upper portion of the second opening edge 42 are welded together by, for example, hot plate welding, vibration welding, laser welding, or the like. As a result, the lid 103 is fixed to the upper sides of the first tank 20 and the second tank 40 so as to cover the first opening 23 and the second opening 43. It is preferable that the gap between the first tank 20 and the second tank 40 and the lid 103 is liquid-tightly sealed.

[0029] As shown in FIG. 2, the lid 103 is formed with a refill port 111 and a port 113. The refill port 111 is an opening for refilling the first tank 20 with the temperature control liquid Lq from the outside. In this embodiment, the refill port 111 is configured so that a cap 112 that closes the refill port 111 can be attached and detached. The port 113 has an opening for recovering the temperature control liquid Lq supplied to the temperature control target into the tank 101 via the flow path 151. In this embodiment, the lid 103 is provided with two ports 113. One of the ports 113 is connected to a piping member that forms the second flow path 153 shown in FIG. 1, and the other port 113 is connected to a piping member that forms the fourth branch flow path 164. The refill port 111 and the port 113 are formed in positions on the lid 103 that overlap with the first opening 23 when viewed vertically.

[0030] 2, the above-described pump 120 and heating unit 130 are fixed to the lid unit 103. Furthermore, in this embodiment, the above-described first valve 180 is fixed to the lid unit 103.

[0031] The pump 120 delivers the temperature control liquid Lq in the first tank 20 to the first flow path 152 shown in FIG. 1 . In this embodiment, the pump 120 is configured as a centrifugal water pump and is fixed to the lid 103 so as to penetrate through the lid 103. In this embodiment, an outlet 122 of the pump 120 and a connector 121 to which wiring members for supplying power to the pump 120 are connected are located on the upper side of the lid 103. The outlet 122 of the pump 120 is connected to the inlet port of the first valve 180 by a piping member that forms the first flow path 152. The pump 120 rotates an impeller located in the liquid chamber to draw the temperature control liquid Lq into the liquid chamber through a suction port in the pump 120 located in the first tank 20 and discharge the drawn temperature control liquid Lq from the outlet 122 to the first flow path 152.

[0032] One of the two outlet ports of the first valve 180 and the inlet port of the heating unit 130 are connected by a piping member that forms a second branch flow path 162. The temperature control liquid Lq is guided into the heating unit 130 via the inlet port of the heating unit 130. The temperature control liquid Lq that has been guided into the heating unit 130 is heated while passing through the heating unit 130, and then discharged from the outlet port of the heating unit 130. A piping member that forms a third branch flow path 163 is connected to the outlet port of the heating unit 130. A piping member that forms a fourth branch flow path 164 is connected to the other outlet port of the first valve 180.

[0033] Fig. 4 is a process diagram of a manufacturing method of the tank 101 in this embodiment. Fig. 5 is a perspective view showing how the tank 101 is manufactured. Fig. 6 is a cross-sectional view showing how the tank 101 is manufactured.

[0034] In the manufacturing method of the tank 101, first, in step S105, a heat shield layer 80 is formed around the third tank 60. More specifically, in step S105, an aluminum vapor-deposited film is formed as the heat shield layer 80 on the underside of the bottom Bt3 of the third tank 60 and on the outside of the side surface Sd3 of the third tank 60. In FIG. 4, the area where the aluminum vapor-deposited film is formed is hatched with an upward sloping pattern. Next, in step S110, a foamed polyethylene sheet FP as a heat insulating material is fixed to the upper surface TS of the third tank 60 by, for example, an adhesive so as to cover the upper surface of the bottom Bt3. Next, in step S115, a foamed polyethylene sheet FP is fixed to the side surface Sd2 of the second tank 40 by, for example, an adhesive so as to cover the side surface Sd2 from the outside. In FIG. 4, the area where the foamed polyethylene sheet FP is to be disposed is hatched with a halftone dot pattern.

[0035] In step S120, the second tank 40 is inserted into the third tank 60, and the lower surface of the second opening edge 42 and the upper surface of the third opening edge 62 are engaged by claws. In this way, the second tank 40, which is surrounded by the insulating layer 61, is prepared, as shown in the upper part of FIG. 6. Next, in step S125, the first tank 20 and the lid member 103p, which has the refill port 111 formed therein, are prepared. The lid member 103p is a member for forming the lid portion 103. In this embodiment, the lid member 103p has the first protrusion 104 and the second protrusion 105, similar to the lid portion 103. The process of preparing the first tank 20, the second tank 40 surrounded by the insulating layer 61, and the lid member 103p, which has the refill port 111 formed therein, as in steps S105 to S125, is also referred to as the first process.

[0036] In step S130, a second step is performed in which the first opening end 22 and the second opening end 42 are fixed to the lid member 103p. In the second step, as shown in the lower part of Fig. 6, the first opening end 22 and the second opening end 42 are fixed to the lid member 103p so that the first tank 20 is accommodated in the second tank 40 with a space sp1 formed between the first tank 20 and the second tank 40 and so that the first opening 23 and the second opening 43 are covered by the lid member 103p. More specifically, in step S130, as described above, the lower part of the first protrusion 104 and the upper part of the first opening end 22, and the lower part of the second protrusion 105 and the upper part of the second opening end 42 are welded together by, for example, hot plate welding.

[0037] In step S135, a third step is performed in which the latent heat storage material liquefied by heating is injected into the space sp1 through an injection port In formed in the lid member 103p. In the third step in this embodiment, paraffin wax PW having a melting point of 50°C or higher and 60°C or lower as the latent heat storage material is liquefied by heating it to a temperature above its melting point, and the liquefied paraffin wax PW is injected into the space sp1 through the injection port In to fill it. As a result, the injected paraffin wax PW surrounds the first tank 20, and the heat storage layer 41 is formed as described in FIG. 3. The injection port In is formed to connect the space sp1 to the outside. The injection port In may be formed, for example, in step S135, or may be formed in a step prior to step S135, such as a preparation step, or may be formed in advance. In this specification, the term "liquid" refers to a state in which the material exhibits fluidity as a whole, and also includes a state in which a solid and a liquid are mixed and a gel state.

[0038] In step S140, a fourth step of closing the injection port In is executed. In step S140, for example, a plug member for closing the injection port In is inserted into the injection port In, and then the plug member is joined to the periphery of the injection port In, thereby liquid-tightly closing the injection port In.

[0039] In step S145, a fifth step is executed in which the pump 120 and the temperature adjustment unit are fixed to the lid member 103p. In step S145 in this embodiment, the pump 120, the heating unit 130, and the first valve 180 are fixed to the lid member 103p. In step S145, for example, fixing holes, concaves, convexities, etc. for fixing each component may be formed in the lid member 103p, and then the components may be fixed. Furthermore, the fixing holes, concaves, convexities, etc. may be formed in the lid member 103p prior to step S145.

[0040] Fig. 7 is a first explanatory diagram showing the results of a comparison test comparing the heat retention performance of vehicle tanks, and Fig. 8 is a second explanatory diagram showing the results of the comparison test.

[0041] In the comparative tests, to prepare each sample, a first cylindrical container Ct1 with a bottom that opens upward, a second container Ct2 that is larger than the first container Ct1 that opens upward, a foamed polyethylene sheet FP, paraffin wax PW, and aluminum foil AF as a heat-shielding material were prepared.

[0042] Sample A was prepared by attaching a foamed polyethylene sheet FP to the periphery of the second container Ct2, attaching aluminum foil AF to the outside of the foamed polyethylene sheet FP, inserting the first container Ct1 into the second container Ct2, and filling the gap between the first container Ct1 and the second container Ct2 with paraffin wax PW. Sample B was prepared by attaching a foamed polyethylene sheet FP to the periphery of the second container Ct2, inserting the first container Ct1 into the second container Ct2, and filling the gap between the first container Ct1 and the second container Ct2 with paraffin wax PW. Sample C was prepared by inserting the first container Ct1 into the second container Ct2 and placing a foamed polyethylene sheet FP between the first container Ct1 and the second container Ct2. Sample D was prepared by inserting the first container Ct1 into the second container Ct2 and filling the gap between the first container Ct1 and the second container Ct2 with paraffin wax PW. Sample E was prepared by attaching aluminum foil AF to the inner and outer surfaces of the sidewalls and the inner and outer surfaces of the bottom of the first container Ct1. The first container Ct1 was used as Sample F. The first container Ct1 of each sample was fitted with a PP lid to cover the opening of the first container Ct1, and the second container Ct2 was fitted with a PP lid to cover the opening of the second container Ct2.

[0043] Samples C2, C3, C4, and C5 were also prepared by replacing the foamed polyethylene sheet FP of Sample C with other insulating materials. Sample C2 used modified polyphenylene ether (PPE) foam beads (Asahi Kasei Corporation). Sample C3 used urethane foam (Achilles Board AG, Achilles Corporation). Sample C4 used special thin insulating material (KR GENEQ SHILD, Kanto Reinetsu Kogyo Co., Ltd.). Sample C5 used polystyrene foam. The thermal conductivities of the insulating materials used in Samples C, C2, C3, and C5 were 0.031 W / (m·K), 0.034 W / (m·K), 0.024 W / (m·K), 0.023 W / (m·K), and 0.04 W / (m·K), respectively.

[0044] In the comparative test, 2.5 L of 65°C water W was stored in the first container Ct1 of each sample at a room temperature of 23°C, and the temperature change over time was measured with a thermometer. Figure 7 shows the water temperature and heat retention performance of each sample after 10 hours. The heat retention performance is expressed as the difference in the water temperature of each sample after 10 hours relative to the water temperature of sample F after 10 hours. In other words, the higher the temperature value for heat retention performance, the better the heat retention performance of that sample. Figure 8 shows a graph with water temperature on the vertical axis and time on the horizontal axis. Figure 8 shows the results of the comparative test of samples A, C, D, E, and F.

[0045] As shown in FIG. 7, the heat retention performance of Sample C was higher than that of Samples C2 to C5. The heat retention performance of Samples A and B was also higher than that of Samples C to F. The heat retention performance of Sample A was also higher than that of Sample B. As shown in FIG. 8, Sample A suppressed the drop in water temperature in all temperature ranges compared to Samples C to F. As such, it was found that the tank 101 exhibited particularly excellent heat retention performance because the lower part 102 of the tank 101 had the heat storage layer 41 formed from paraffin wax, the heat insulating layer 61 formed from foamed polyethylene, and the heat shield layer 80 formed from aluminum.

[0046] The tank 101 in the present embodiment described above includes the heat storage layer 41 that surrounds the first tank 20, which stores the temperature control liquid Lq, and the insulating layer 61 that surrounds the first tank 20 outside the heat storage layer 41. The pump 120 and the heating unit 130 are fixed to the lid 103, which covers the first opening 23 and has the refill port 111 formed therein. In this configuration, the pump 120 and the heating unit 130 can be fixed to the lid 103, rather than to the first tank 20, which is surrounded by the heat storage layer 41 and the insulating layer 61. This eliminates the need to form fixing holes or irregularities in the lower part 102 for fixing the pump 120, etc., compared to, for example, fixing the pump 120 and the heating unit 130 to the lower part 102. This prevents a decrease in the heat retention performance of the heat storage layer 41 and the insulating layer 61. Furthermore, since the pump 120 and the heating unit 130 can be integrated into the tank 101, it is possible to suppress, for example, an increase in the installation space required for each component in the horizontal direction or an increase in the installation space due to an increase in the piping length. In this way, in the temperature adjustment system 100, it is possible to suppress an increase in the installation space required due to components being scattered around.

[0047] Furthermore, in this embodiment, the temperature control liquid Lq after heating the battery pack BP and heater core HC is collected in the tank 101 and can be kept warm in the tank 101, allowing for efficient use of waste heat in the temperature control system 100. This makes it possible to reduce the output of the heating unit 130, increasing the possibility of reducing the power consumption of the drive battery of the battery pack BP.

[0048] In this embodiment, a valve for opening and closing the flow path 151 is also fixed to the lid 103. Therefore, the tank 101 can further integrate the valves.

[0049] Furthermore, in this embodiment, a heat shield layer 80 is provided that surrounds the first tank 20 on the outside of the heat insulating layer 61. Therefore, the temperature control liquid Lq in the first tank 20 can be kept warm with high efficiency by the heat storage layer 41, the heat insulating layer 61, and the heat shield layer 80.

[0050] In this embodiment, the heat storage layer 41 is made of paraffin wax, the heat insulating layer 61 is made of foamed polyethylene, and the heat shielding layer 80 is made of aluminum. This configuration allows the temperature control liquid Lq in the first tank 20 to be kept warm more efficiently. Furthermore, the material cost of the tank 101 can be reduced compared to when the heat storage layer 41 is made of, for example, microcapsules containing a heat storage material. Furthermore, the material cost of the tank 101 can be reduced compared to when the heat shielding layer 80 is made of, for example, silver or gold.

[0051] B. Other Embodiments: (B1) In the above embodiment, the heating unit 130 is fixed to the lid unit 103 as the temperature adjustment unit. In the above embodiment, instead of or in addition to the heating unit 130, for example, a cooling unit 140 configured as a chiller may be fixed to the lid unit 103 as the temperature adjustment unit.

[0052] (B2) In the above embodiment, the lid portion 103 may be provided with, for example, two or more pumps 120, two or more heating portions 130, two or more cooling portions 140, or two or more valves.

[0053] (B3) In the above embodiment, a switching valve is fixed to the lid portion 103, but for example, a valve that simply opens and closes one flow path 151 may be fixed thereto. Also, a valve does not have to be fixed to the lid portion 103.

[0054] (B4) In the above embodiment, the heat shield layer 80 is provided, but the heat shield layer 80 does not have to be provided. In this way, the tank 101 not provided with the heat shield layer 80 can be manufactured by, for example, omitting step S105 in the manufacturing method shown in Fig. 4. In other words, the manufacturing method of the tank 101 does not have to include the step of forming the heat shield layer 80.

[0055] (B5) In the above embodiment, the heat storage layer 41 is formed from paraffin wax, but it does not have to be formed from paraffin wax. For example, the heat storage layer 41 may be formed from alkaline earth metal salt, alkali metal salt, alkaline earth metal hydroxide, alkali metal hydroxide, or naphthalene, or may be formed from melamine or acrylic microcapsules in which a heat storage material is encapsulated. Furthermore, the heat storage layer 41 may be formed from, for example, a sensible heat storage material.

[0056] (B6) In the above embodiment, the heat insulating layer 61 is made of foamed polyethylene, but it does not have to be made of foamed polyethylene. For example, the heat insulating layer 61 may be made of PPE, foamed urethane, foamed polystyrene, foamed polyolefin, foamed rubber, or foamed metal.

[0057] (B7) In the above embodiment, the heat shield layer 80 is made of aluminum, but it does not have to be made of aluminum. For example, the heat shield layer 80 may be made of gold, silver, or an aluminum alloy.

[0058] (B8) In the above embodiment, in the manufacturing method of the tank 101, the fifth step is performed after the fourth step, but the fifth step does not have to be performed after the fourth step. For example, the fifth step may be performed immediately after the first step.

[0059] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0060] 20...first tank, 22...first opening end, 23...first opening, 40...second tank, 41...thermal storage layer, 42...second opening end, 43...second opening, 60...third tank, 61...insulating layer, 62...third opening end, 63...third opening, 80...heat shield layer, 100...temperature control system, 101...tank, 102...lower portion, 103...lid portion, 103p...lid member, 104...first protrusion, 105...second protrusion, 111...refill port, 112...cap 113...port, 120...pump, 121...connector, 122...discharge port, 130...heating section, 140...cooling section, 150...circulation circuit, 151...flow path, 152...first flow path, 153...second flow path, 161...first branch flow path, 162...second branch flow path, 163...third branch flow path, 164...fourth branch flow path, 170...first branch point, 171...second branch point, 172...junction, 180...first valve, 181...second valve

Claims

1. A tank for a vehicle that is provided in a temperature control system that adjusts the temperature of a temperature control object mounted on a vehicle using a temperature control liquid, a container portion having a bottomed cylindrical shape with an open end portion that opens upward and that stores the temperature control liquid; a lid portion fixed to the open end portion to cover the opening of the open end portion, the lid portion having a refill port formed therein for refilling the temperature control liquid from the outside into the container portion; a heat storage layer formed of a heat storage material and surrounding the container portion; a heat insulating layer formed of a heat insulating material and surrounding the container portion on the outside of the heat storage layer, A vehicle tank, wherein the lid portion has fixed thereto a pump for sending the temperature-control liquid in the container portion to a flow path, and a temperature control portion for adjusting the temperature of the temperature-control liquid flowing through the flow path.

2. The vehicle tank according to claim 1, A vehicle tank, wherein a valve for opening and closing the flow path is fixed to the lid portion.

3. The tank for a vehicle according to claim 1 or 2, A tank for a vehicle, comprising a heat insulating layer formed of a heat insulating material and surrounding the container portion outside the heat insulating layer.

4. The vehicle tank according to claim 3, The heat storage layer is formed of paraffin wax, The heat insulating layer is formed of foamed polyethylene, The vehicle tank, wherein the heat shield layer is formed of aluminum.

5. A method for manufacturing a tank for a vehicle, which is provided in a temperature control system that adjusts the temperature of a temperature control object mounted on a vehicle using a temperature control liquid, a first step of preparing a first tank having a bottomed cylindrical shape with a first open end and configured to store the temperature regulating liquid; a second tank having a bottomed cylindrical shape with a second open end and configured to be surrounded by an insulating layer having an insulating material; and a cover member having a refill port formed therein for refilling the temperature regulating liquid into the first tank; a second step of fixing the first opening end and the second opening end to the lid member so that the first tank is accommodated in the second tank with a gap formed between the first tank and the second tank and so that the opening of the first opening end and the opening of the second opening end are covered by the lid member; a third step of injecting a heat storage material, which stores heat by latent heat and is liquefied by heating to a temperature equal to or higher than its melting point, into the gap through an injection port formed in the lid member, thereby surrounding the first tank with the heat storage material; a fourth step of closing the injection port after the third step; and a fifth step of fixing to the lid member a pump for sending the temperature-adjusted liquid in the first tank to the outside and a temperature adjustment unit for adjusting the temperature of the temperature-adjusted liquid flowing through a flow path connected to the pump.

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