Battery pack tray, thermal management system, battery pack, and vehicle

Abstract

This disclosure relates to a battery pack tray, a thermal management system, a battery pack, and a vehicle. The battery pack tray includes: a support layer for supporting battery cell modules; and a heat dissipation layer, stacked on the support layer on the side opposite to the battery cell modules. The heat dissipation layer is at least partially in direct contact with the outside air. The heat dissipation layer has a first flow channel for circulating a first heat exchange medium to dissipate heat to the outside. In this disclosure, the battery cell modules are mounted on the support layer, and the heat dissipation layer is located on the side of the support layer opposite to the battery cell modules. The heat dissipation layer has a first flow channel for circulating the first heat exchange medium, and at least part of the heat dissipation layer is in contact with the outside air to assist in heat dissipation. This allows the heat from the battery cell modules to be transferred to the outside independently without relying on other thermal management systems, reducing the load on other thermal management systems.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack heat dissipation technology, specifically to a battery pack tray, a thermal management system, a battery pack, and a vehicle. Background Technology

[0002] The cooling structure of current mainstream vehicles usually requires the front-end heat dissipation system of the whole vehicle to achieve the purpose of cooling the heat-generating components. However, due to the limited space of the front-end module, the maximum heat dissipation capacity is limited, which can lead to insufficient heat dissipation. Summary of the Invention

[0003] The purpose of this disclosure is to provide a battery pack tray, a thermal management system, a battery pack, and a vehicle that can solve the aforementioned technical problems.

[0004] To achieve the above objectives, this disclosure provides a battery pack tray, comprising: a support layer for supporting a battery cell module; and a heat dissipation layer, which is stacked on the support layer on the side away from the battery cell module, wherein the projected area of ​​the heat dissipation layer in the thickness direction of the support layer is smaller than the projected area of ​​the support layer, the heat dissipation layer is at least partially in direct contact with the outside air, and the heat dissipation layer is provided with a first flow channel for circulating a first heat exchange medium to dissipate heat to the outside through the heat dissipation layer.

[0005] Optionally, the heat dissipation device includes a second cooling channel and heat dissipation fins, and a plurality of heat dissipation fins are protruding from the surface of the heat dissipation layer opposite to the support layer.

[0006] Optionally, the supporting layer is thermally conductive to the cell module, and the battery pack tray further includes a heat insulation layer disposed between the supporting layer and the heat dissipation layer.

[0007] Optionally, the supporting layer is thermally conductive to the cell module, and the battery pack tray further includes a thermally conductive layer disposed between the supporting layer and the heat dissipation layer.

[0008] A second objective of this disclosure is to provide a thermal management system, comprising: the aforementioned battery pack tray; a first heat exchange channel, wherein the first heat exchange channel is connected to a first water pump and a first heating element; and a solenoid valve, wherein the solenoid valve can selectively connect or disconnect the first heat exchange channel from the first flow channel, wherein when the solenoid valve connects the first heat exchange channel to the first flow channel, the first heat exchange channel and the first flow channel form a heat exchange circulation loop.

[0009] Optionally, the thermal management system further includes a second heat exchange channel, which is connected to a second water pump and a second heating element; The solenoid valve is a multi-way valve. The solenoid valve connects the first flow channel, the first heat exchange flow channel and the second heat exchange flow channel. The solenoid valve can also selectively connect or disconnect the second heat exchange flow channel from the first flow channel. When the solenoid valve connects the second heat exchange flow channel from the first flow channel, the second heat exchange flow channel and the first flow channel form a heat exchange circulation loop. Among them, one of the first heating component and the second heating component is a battery pack assembly, and the other is a motor assembly.

[0010] Optionally, the first and second ends of the solenoid valve are connected to the inlet and outlet ends of the first flow channel, respectively; the third and fourth ends of the solenoid valve are connected to the outlet and inlet ends of the first heat exchange flow channel, respectively; and the fifth and sixth ends of the solenoid valve are connected to the outlet and inlet ends of the second heat exchange flow channel, respectively. The solenoid valve can selectively activate two of the first, second, third, fourth, fifth, and sixth ends. When the solenoid valve selectively connects the first end and the second end, the third end and the fourth end, and the fifth end and the sixth end, the first flow channel, the first heat exchange flow channel and the second heat exchange flow channel respectively form three independent loops; When the solenoid valve selectively conducts the first end and the third end, and the second end and the fourth end, the first flow channel and the first heat exchange flow channel form a heat exchange circulation loop. When the solenoid valve selectively connects the first end and the fifth end, and the second end and the sixth end, the first flow channel and the second heat exchange flow channel form a heat exchange circulation loop.

[0011] Optionally, the solenoid valve is a multi-way valve, with its first and second ends connected to the outlet and inlet ends of the first flow channel, respectively, and its third and fourth ends connected to the outlet and inlet ends of the first heat exchange flow channel, respectively. When the solenoid valve selectively conducts the first end and the second end, and the third end and the fourth end, the first flow channel and the first heat exchange flow channel respectively form two independent loops; When the solenoid valve selectively connects the first end to the third end, the second end to the fourth end, or the first end to the fourth end, the second end to the third end, the first flow channel and the first heat exchange flow channel form a heat exchange circulation loop.

[0012] A third object of this disclosure is to provide a battery pack comprising: the aforementioned thermal management system; a cell module disposed on the battery pack tray; and a cover disposed on the battery pack tray.

[0013] A fourth object of this disclosure is to provide a vehicle comprising: the aforementioned thermal management system.

[0014] With the above technical solution, the battery cell module is installed on the support layer, and the heat dissipation layer is set on the side of the support layer away from the battery cell module. The heat dissipation layer is provided with a first flow channel for the first heat exchange medium to flow, and the heat dissipation layer is at least partially in contact with the outside air to assist in heat dissipation. The heat dissipation layer is set in the space of the support layer to enhance the heat dissipation capacity.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the battery pack tray structure in this disclosure; Figure 2 yes Figure 1 Cross-sectional view of AA; Figure 3 This is a system connection diagram for the third mode of the thermal management system disclosed in this publication; Figure 4 This is a system connection diagram for the second mode of the thermal management system disclosed in this publication; Figure 5 This is a system connection diagram for the first mode of the thermal management system disclosed in this publication; Figure 6 This is the system connection diagram for the fifth mode of the thermal management system disclosed in this publication; Figure 7 This is the system connection diagram for the sixth mode of the thermal management system disclosed in this publication; Figure 8 This is a system connection diagram for the fourth mode of the thermal management system disclosed in this publication; Figure 9 This is a schematic diagram of the battery pack structure in this disclosure.

[0017] Explanation of reference numerals in the attached figures 1. Support layer; 2. Second flow channel; 3. Heat dissipation layer; 31. First flow channel; 32. Heat dissipation fins; 4. Insulation layer; 5. Second heat exchange flow channel; 51. Second water pump; 52. Heat exchanger; 53. Expansion valve; 54. Condenser; 55. Compressor; 6. First heat exchange flow channel; 61. First heating element; 62. Radiator; 63. First water pump; 7. Solenoid valve; 71. First end; 72. Second end; 73. Third end; 74. Fourth end; 75. Fifth end; 76. Sixth end; 8. Battery cell module; 9. Cover; 10. Second heating element. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" generally refer to the upper, lower, top, and bottom directions of the corresponding component in its operational state, while "inner" and "outer" refer to the inner and outer dimensions relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0020] This disclosure provides a battery pack tray, including: a support layer 1 for supporting a battery cell module 8; a heat dissipation layer 3, which is stacked on the support layer 1 on the side away from the battery cell module 8, and the projected area of ​​the heat dissipation layer 3 in the thickness direction of the support layer 1 is smaller than the projected area of ​​the support layer 1. The heat dissipation layer 3 is at least partially in direct contact with the outside air, and the heat dissipation layer 3 is provided with a first flow channel 31 for circulating a first heat exchange medium to dissipate heat to the outside through the heat dissipation layer 3.

[0021] Through the above technical solution, the battery cell module 8 is mounted on the support layer 1, and the heat dissipation layer 3 is located on the side of the support layer 1 away from the battery cell module 8. The heat dissipation layer 3 has a first flow channel 31 for the first heat exchange medium to circulate within it, and the heat dissipation layer 3 is at least partially in contact with the outside air to assist in heat dissipation. The heat dissipation layer 3 is set up using the space of the support layer 1 to enhance the heat dissipation capacity. This fully utilizes the large area at the bottom of the battery pack, and the function of the support layer 1 is designed to integrate protection and cooling. Without occupying a large amount of additional space, it provides a high-power heat dissipation channel for the entire vehicle, achieving performance improvement and energy saving. The support layer 1 itself has a second flow channel 2, which is located on the side of the first flow channel 31 near the battery cell module 8. The second flow channel 2 circulates a second heat exchange medium for heat dissipation of the battery cell module 8.

[0022] As an optional implementation, the surface of the heat dissipation layer 3 facing away from the support layer 1 is provided with a plurality of heat dissipation fins 32. The heat dissipation fins 32 extend beyond the support layer 1. The heat from the first flow channel 31 is transferred to the heat dissipation fins 32 and then transferred to the outside of the battery pack through the heat dissipation fins 32. If the battery pack is a vehicle battery pack, the heat dissipation fins 32 extend beyond the vehicle chassis and are exposed to the high-speed airflow, which can quickly remove the heat from the heat dissipation fins 32 at the bottom.

[0023] As an optional implementation, the support layer 1 conducts heat with the cell module 8, and the battery pack tray also includes a heat insulation layer 4. The heat insulation layer 4 is disposed between the support layer 1 and the heat dissipation layer 3, and is actually disposed between the first flow channel 31 and the second flow channel 2. The heat insulation layer 4 can prevent the first flow channel 31 and the second flow channel 2 from affecting each other. For example, when the ambient temperature is high, it can prevent the second heat exchange medium in the second flow channel 2 from being heated when the temperature in the first flow channel 31 is higher than that in the second flow channel 2.

[0024] As another optional implementation, the support layer 1 and the cell module 8 are thermally conductive. The battery pack tray also includes a thermally conductive layer, which is disposed between the support layer 1 and the heat dissipation layer 3. The thermally conductive layer can transfer the heat of the cell module 8 to the heat dissipation layer 3 for heat dissipation.

[0025] The second objective of this disclosure is to provide a thermal management system, comprising: the aforementioned battery pack tray; a first heat exchange channel 6, the first heat exchange channel 6 being connected to a first water pump 63 and a first heating element 61; the first water pump 63 being used to drive the circulation of cooling medium; and a solenoid valve 7, the solenoid valve 7 being selectively connected or disconnected from the first heat exchange channel 6 and the first channel 31. When the solenoid valve 7 connects the first heat exchange channel 6 and the first channel 31, the first heat exchange channel 6 and the first channel 31 form a heat exchange circulation loop, jointly dissipating heat for the first heating element 61. At the same time, the first heat exchange channel 6 can also dissipate heat for the first heat exchange medium in the first channel 31, allowing the first heat exchange medium to be circulated.

[0026] As an optional implementation, the thermal management system further includes a second heat exchange channel 5, which is connected to a second water pump 51 and a second heating element 10. The second water pump 51 is used to drive the circulation of the heat exchange medium. The solenoid valve 7 is a multi-way valve, which is connected to the first channel 31, the first heat exchange channel 6, and the second heat exchange channel 5. The solenoid valve 7 can also selectively connect or disconnect the second heat exchange channel 5 from the first channel 31. When the solenoid valve 7 connects the second heat exchange channel 5 to the first channel 31, the second heat exchange channel 5 and the first channel 31 form a heat exchange circulation loop. Among them, one of the first heating element 61 and the second heating element 10 is a battery pack assembly, and the other is a motor assembly. That is, the solenoid valve 7 allows the first channel 31 to be selectively connected to the first heat exchange channel 6 or the second heat exchange channel 5 to dissipate heat for the battery pack assembly or the motor assembly. The following example uses the first heat exchange channel 6 to cool the motor assembly and the second heat exchange channel 5 to cool the battery pack assembly.

[0027] For example, the first heat exchange channel 6 is used to dissipate heat for the motor assembly. The first heat exchange channel 6 includes a first heating element 61, a first water pump 63, and a radiator 62 connected in series. The second heat exchange channel 5 is used to dissipate heat for the battery module 8. It includes a second heating element 10, a heat exchanger 52, a second water pump 51, a compressor 55, a condenser 54, and an expansion valve 53. The heat exchange end of the heat exchanger 52 is connected to the second channel 2 to exchange heat with the second channel 2, thereby cooling the second heat exchange medium in the second channel 2. The heat exchange end is connected to the second water pump 51. The cooling end of the heat exchanger 52 is used to re-cool the heat exchange medium after exchanging heat with the second channel 2. The cooling end is connected in series to the compressor 55, the condenser 54, and the expansion valve 53. The compressor 55 provides power for the refrigeration cycle, the condenser 54 cools the heat exchange medium, and the expansion valve 53 is used for throttling and pressure reduction. In other embodiments, the second heat exchange channel 5 may also include a second heating element 10, a compressor 55, a condenser 54, and an expansion valve 53.

[0028] Optionally, the first end 71 and the second end 72 of the solenoid valve 7 are connected to the inlet end and the outlet end of the first flow channel 31, respectively; the third end 73 and the fourth end 74 of the solenoid valve 7 are connected to the outlet end and the inlet end of the first heat exchange flow channel 6, respectively; and the fifth end 75 and the sixth end 76 of the solenoid valve 7 are connected to the outlet end and the inlet end of the second heat exchange flow channel 5, respectively. The solenoid valve 7 can selectively conduct two of the first end 71, the second end 72, the third end 73, the fourth end 74, the fifth end 75, and the sixth end 76.

[0029] The first mode, such as Figure 5 As shown, when the solenoid valve 7 selectively connects the first end 71 to the second end 72, the third end 73 to the fourth end 74, and the fifth end 75 to the sixth end 76, the first flow channel 31, the first heat exchange flow channel 6, and the second heat exchange flow channel 5 form three independent circuits. When the ambient temperature is high, but the battery requires cooling and the compressor 55 needs to be started, the temperature of the heat exchange medium after heat exchange through the heat exchanger 52 is lower than the ambient temperature. Therefore, the first flow channel 31 is disconnected from the second heat exchange flow channel 5 to prevent the first flow channel 31 from heating the second heat exchange medium in the second heat exchange flow channel 5. Simultaneously, when the radiator 62 has a low load and can meet its own heat dissipation needs, the first flow channel 31 is disconnected from the first heat exchange flow channel 6, thereby reducing the circuit water resistance and preventing an increase in the power of the first water pump 63.

[0030] The second mode, such as Figure 4As shown, when the solenoid valve 7 selectively conducts the first end 71 and the third end 73, and the second end 72 and the fourth end 74, the first flow channel 31 and the first heat exchange flow channel 6 form a heat exchange circulation loop. When the heat load of the drive assembly is large, the first flow channel 31 can be connected to the first heat exchange flow channel 6 to act as the radiator of the first heat exchange flow channel 6, further improving the vehicle's power and environmental adaptability. In addition, when the load is not large, connecting it can reduce the speed of the condenser 54 fan, thereby achieving the purpose of reducing energy consumption.

[0031] In the third mode, when the solenoid valve 7 selectively conducts the first end 71 and the fifth end 75, and the second end 72 and the sixth end 76, the first flow channel 31 and the second heat exchange flow channel 5 form a heat exchange circulation loop, that is, the first flow channel 31 and the second flow channel 2 are connected. When the ambient temperature is not high, but the battery has a large cooling demand, the first flow channel 31 and the second heat exchange flow channel 5 can be connected. In this way, the temperature control of the cell module 8 can be carried out without starting the compressor 55. The battery can be cooled without starting the compressor 55 within a wide range of ambient temperatures, which greatly reduces the energy consumption of vehicle thermal management.

[0032] Optionally, the solenoid valve 7 is a multi-way valve, with the first end 71 and the second end 72 of the solenoid valve 7 connected to the outlet end and the inlet end of the first flow channel 31, respectively, and the third end 73 and the fourth end 74 of the solenoid valve 7 connected to the outlet end and the inlet end of the first heat exchange flow channel 6, respectively.

[0033] The fourth mode, such as Figure 8 As shown, when the solenoid valve 7 selectively connects the first end 71 and the second end 72, and the third end 73 and the fourth end 74, the first flow channel 31 and the first heat exchange flow channel 6 form two independent loops. That is, the first heat exchange flow channel 6 is in a small circulation state and is not connected to the first flow channel 31. When the battery has a heating requirement and the heat load of the motor assembly is very small, the four-way valve is in a small circulation state, which can effectively utilize the static first heat exchange medium in the first flow channel 31 as a heat insulation layer to reduce the heat released to the air by the second heating component 10. When the heat load of the motor assembly is generally small or small, and the battery is not in a cooling or heating state, it can effectively block the influence of the heat load of the motor assembly on the battery.

[0034] When the solenoid valve 7 selectively connects the first end 71 and the third end 73, the second end 72 and the fourth end 74, or the first end 71 and the fourth end 74, the second end 72 and the third end 73, the first flow channel 31 and the first heat exchange flow channel 6 form a heat exchange circulation loop.

[0035] The fifth mode, such as Figure 6As shown, when the heat load on the motor assembly is high and the battery is in a cooling state, the four-way valve is in the forward rotation state of the large circulation, which can effectively utilize the remaining cold energy of the second flow channel 2 for cooling. When the heat load on the motor assembly is high and the battery is in a heating state, the four-way valve is in the forward rotation state of the large circulation, which can effectively utilize the remaining heat of the motor assembly to heat the battery pack. When the heat load on the motor assembly is low and the battery is in an internal circulation or cooling state, the four-way valve is in the forward rotation state of the large circulation, which can effectively utilize the first flow channel 31 for heat dissipation.

[0036] The sixth mode, such as Figure 7 As shown, when the solenoid valve 7 selectively conducts the first end 71 and the third end 73, and the second end 72 and the fourth end 74, when the battery pack has a large temperature difference problem, the four-way valve adjusts its working state to the large circulation reverse state, that is, the state of switching back and forth between forward and reverse rotation, which can reduce the temperature difference on both sides of the battery pack, thereby effectively reducing the temperature difference of the battery and making the battery performance better.

[0037] The third objective of this disclosure is to provide a battery pack, including: the aforementioned thermal management system; a cell module 8 disposed on a battery pack tray; and a cover 9 disposed on the battery pack tray, which makes full use of the large area at the bottom of the battery pack and designs the function of the support layer 1 to integrate protection and cooling, providing a high-power heat dissipation channel for the entire vehicle without occupying a large amount of additional space, thereby achieving the effects of performance improvement and energy saving.

[0038] The fourth objective of this disclosure is to provide a vehicle comprising: the aforementioned thermal management system, wherein the heat dissipation fins 32 at the bottom of the battery pack extend beyond the vehicle chassis and are exposed to high-speed airflow, thereby rapidly dissipating heat from the bottom heat dissipation layer 3 and providing the vehicle with a high-power heat dissipation channel to achieve performance improvement and energy saving.

[0039] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0041] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery pack tray, characterized by, include: Support layer, used to support the battery cell module; A heat dissipation layer is stacked on the side of the support layer away from the battery cell module, and the projected area of ​​the heat dissipation layer in the thickness direction of the support layer is smaller than the projected area of ​​the support layer. The heat dissipation layer is at least partially in direct contact with the outside air. The heat dissipation layer is provided with a first flow channel for circulating a first heat exchange medium to dissipate heat to the outside through the heat dissipation layer.

2. The battery pack tray according to claim 1, characterized in that, The surface of the heat dissipation layer opposite to the supporting layer has multiple heat dissipation fins protruding.

3. The battery pack tray according to claim 1 or 2, characterized in that, The supporting layer conducts heat with the cell module, and the battery pack tray also includes a heat insulation layer, which is disposed between the supporting layer and the heat dissipation layer.

4. The battery pack tray according to claim 1 or 2, characterized in that, The supporting layer conducts heat with the cell module, and the battery pack tray also includes a heat-conducting layer, which is disposed between the supporting layer and the heat dissipation layer.

5. A thermal management system, characterized in that, include: Battery pack tray according to any one of claims 1-4; The first heat exchange channel is connected to the first water pump and the first heating element; The solenoid valve can selectively connect or disconnect the first heat exchange channel and the first flow channel. When the solenoid valve connects the first heat exchange channel and the first flow channel, the first heat exchange channel and the first flow channel form a heat exchange circulation loop.

6. The thermal management system according to claim 5, characterized in that, The thermal management system further includes a second heat exchange channel, which is connected to a second water pump and a second heating element. The solenoid valve is a multi-way valve. The solenoid valve connects the first flow channel, the first heat exchange flow channel and the second heat exchange flow channel. The solenoid valve can also selectively connect or disconnect the second heat exchange flow channel from the first flow channel. When the solenoid valve connects the second heat exchange flow channel from the first flow channel, the second heat exchange flow channel and the first flow channel form a heat exchange circulation loop. Among them, one of the first heating component and the second heating component is a battery pack assembly, and the other is a motor assembly.

7. The thermal management system according to claim 6, characterized in that, The first and second ends of the solenoid valve are connected to the inlet and outlet ends of the first flow channel, respectively; the third and fourth ends of the solenoid valve are connected to the outlet and inlet ends of the first heat exchange flow channel, respectively; and the fifth and sixth ends of the solenoid valve are connected to the outlet and inlet ends of the second heat exchange flow channel, respectively. The solenoid valve can selectively activate two of the following ends: the first end, the second end, the third end, the fourth end, the fifth end, and the sixth end. When the solenoid valve selectively connects the first end and the second end, the third end and the fourth end, and the fifth end and the sixth end, the first flow channel, the first heat exchange flow channel and the second heat exchange flow channel respectively form three independent loops; When the solenoid valve selectively conducts the first end and the third end, and the second end and the fourth end, the first flow channel and the first heat exchange flow channel form a heat exchange circulation loop. When the solenoid valve selectively connects the first end and the fifth end, and the second end and the sixth end, the first flow channel and the second heat exchange flow channel form a heat exchange circulation loop.

8. The thermal management system according to claim 5, characterized in that, The solenoid valve is a multi-way valve. The first and second ends of the solenoid valve are connected to the outlet and inlet ends of the first flow channel, respectively, and the third and fourth ends of the solenoid valve are connected to the outlet and inlet ends of the first heat exchange flow channel, respectively. When the solenoid valve selectively conducts the first end and the second end, and the third end and the fourth end, the first flow channel and the first heat exchange flow channel respectively form two independent loops; When the solenoid valve selectively connects the first end to the third end, the second end to the fourth end, or the first end to the fourth end, the second end to the third end, the first flow channel and the first heat exchange flow channel form a heat exchange circulation loop.

9. A battery pack, characterized in that, include: Battery pack tray according to any one of claims 1-4; The battery cell module is mounted on the battery pack tray; as well as A cover is placed over the battery pack tray.

10. A vehicle, characterized in that, include: The thermal management system according to any one of claims 5-8.

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