Battery pack thermal management system and power utilization device

Abstract

The utility model provides a battery pack thermal management system and an electric device, the battery pack thermal management system comprises a direct cooling loop and a liquid cooling loop; the direct cooling loop comprises a direct cooling plate and a refrigerating system connected with the direct cooling plate, the refrigerating system is used for cooling a refrigerant in the direct cooling loop, the direct cooling plate is used for cooling one of the top and the bottom of the battery cell module, and the liquid cooling loop comprises a battery cooler connected with the refrigerating system and a liquid cooling plate connected with the battery cooler. And the liquid cooling plate is used for cooling the other one of the top and the bottom of the battery cell module. According to the battery pack heat management system, the battery cell module can be cooled through the liquid cooling plate and the direct cooling plate at the same time, and the effect of high cooling efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and more particularly to a battery pack thermal management system. The present invention also relates to an electrical device equipped with the thermal management system. Background Art

[0002] The main purpose of the battery pack thermal management system is to control the temperature of the battery pack and ensure that the battery operates within the optimal operating temperature range, thereby improving battery performance, extending battery life, and ensuring vehicle safety.

[0003] With the development of electric vehicle technology and market demand, the charging speed and capacity of battery packs are constantly improving. Fast charging technology can fully charge the battery pack in a short time, which means that the battery pack needs to withstand higher current density and power input during the charging process. As a result, the chemical reaction inside the battery pack will generate a lot of heat during the charging process. As the temperature of the battery pack rises, the resistance inside the battery pack will also increase, further exacerbating the generation of heat.

[0004] However, in the existing technology, liquid cooling or direct cooling technology is usually used alone to cool the battery pack. When the battery charging performance continues to improve, liquid cooling or direct cooling alone cannot meet the cooling performance requirements, and the cooling efficiency is low. In addition, if the direct cooling solution is used alone, the system temperature difference is larger, which is not conducive to improving the battery charging performance. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery pack thermal management system and an electrical device to improve the cooling efficiency of the battery pack.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A battery pack thermal management system includes a direct cooling circuit and a liquid cooling circuit.

[0008] The direct cooling circuit includes a direct cooling plate and a refrigeration system connected to the direct cooling plate. The refrigeration system is used to cool the refrigerant in the direct cooling circuit. The direct cooling plate is used to cool one of the top and bottom of the battery cell module. The liquid cooling circuit includes a battery cooler connected to the refrigeration system and a liquid cooling plate connected to the battery cooler. The liquid cooling plate is used to cool the other of the top and bottom of the battery cell module.

[0009] Furthermore, the refrigeration system includes a direct cooling pipeline and a refrigeration component connected to the direct cooling pipeline.

[0010] Furthermore, the direct cooling pipeline includes a direct cooling inlet pipe connected between the inlet of the direct cooling plate and the outlet of the refrigeration component, and a direct cooling outlet pipe connected between the outlet of the direct cooling plate and the inlet of the refrigeration component. A first three-way valve is provided on the direct cooling inlet pipe, and the direct cooling inlet pipe is connected to the direct cooling outlet pipe through the first three-way valve.

[0011] Furthermore, the battery cooler has an expansion valve located upstream of the first three-way valve, and the battery cooler is connected to the direct cooling inlet pipe through the expansion valve.

[0012] Furthermore, the battery cooler has a heat exchanger connected to the expansion valve, the liquid cooling plate is connected in series with the battery cooler through the heat exchanger, and the refrigerant in the direct cooling circuit and the coolant in the liquid cooling circuit exchange heat through the heat exchanger.

[0013] Furthermore, the inlet of the liquid cooling plate and the coolant outlet of the heat exchanger are connected through a liquid cooling inlet pipe, and the outlet of the liquid cooling plate and the coolant inlet of the heat exchanger are connected through a liquid cooling outlet pipe; a heating unit is connected in series to the liquid cooling inlet pipe, and / or a pumping unit is connected in series to the liquid cooling outlet pipe.

[0014] Furthermore, the refrigeration assembly includes a condenser, a compressor, and an evaporator; the inlet of the condenser is connected to the outlet of the compressor, the outlet of the condenser is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor.

[0015] Furthermore, the refrigeration assembly includes a first three-way joint, a second three-way joint, and a second three-way valve; the inlet of the second three-way valve is connected to the outlet of the condenser, the first outlet of the second three-way valve is connected to the inlet of the evaporator, and the second outlet of the second three-way valve is connected to the inlet of the expansion valve; the first inlet joint of the first three-way joint is connected to the outlet of the evaporator, the outlet joint of the first three-way joint is connected to the inlet of the compressor, and the second inlet joint of the first three-way joint is connected to the outlet joint of the second three-way joint;

[0016] The first inlet connector of the second three-way connector is connected to the second outlet of the first three-way valve, and the second inlet of the second three-way connector is connected to the outlet of the direct cooling plate; the first outlet of the first three-way valve is connected to the inlet of the direct cooling plate, and the inlet of the first three-way valve is connected to the outlet of the expansion valve.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The battery pack thermal management system described in the present invention can cool the top and bottom of the battery cell module at the same time through the direct cooling plate and the liquid cooling plate. The refrigeration system increases the heat exchange area between the thermal management system and the battery system, improves the heat exchange capacity of the battery under high-load conditions such as fast charging, and effectively reduces the problem of excessive battery pack temperature caused by using liquid cooling or direct cooling alone.

[0019] Among them, the refrigerant in the refrigeration component reaches the direct cooling plate from the outlet of the refrigeration component through the direct cooling inlet pipe. The refrigerant absorbs the heat generated by the battery module in the direct cooling plate. The heated refrigerant returns to the refrigeration component through the direct cooling outlet pipe for cooling. The refrigerant directly contacts the surface of the battery module and can quickly take away the heat, ensuring that the battery is cooled in a short time. In addition, the setting of the first three-way valve allows the refrigerant to directly enter the direct cooling outlet pipe from the direct cooling inlet pipe when the battery pack does not need to be cooled, reducing unnecessary refrigerant circulation and saving energy.

[0020] The battery cooler also features an expansion valve located upstream of the first three-way valve. This throttling action reduces the refrigerant's pressure, thereby lowering its temperature. This lowers the refrigerant's temperature before it enters the direct cooling plate, improving cooling efficiency. The refrigerant first exchanges heat with the coolant in the battery cooler through a heat exchanger before entering the direct cooling plate to cool the battery pack. The coolant then flows through the liquid cooling circuit into the liquid cooling plate to cool the battery pack itself. This allows both the direct cooling plate and the liquid cooling plate to cool the battery module simultaneously, significantly improving cooling efficiency.

[0021] In addition, when the temperature of the battery cell module is too low, the coolant can be heated by the heating unit connected in series on the liquid cooling inlet pipe. The heated coolant flows along the liquid cooling inlet pipe into the liquid cooling plate, and the liquid cooling plate heats the battery cell module to ensure the startup and normal operation of the battery module in a low temperature environment.

[0022] Another object of the present invention is to provide an electrical device, in which the battery pack thermal management system as described above is provided.

[0023] Furthermore, the power-consuming device is an electric vehicle or a hybrid vehicle; and the refrigeration system is an air-conditioning refrigeration system in the electric vehicle or hybrid vehicle.

[0024] The electrical device described in the present invention is provided with the above-mentioned battery pack thermal management system. Compared with traditional technologies, the battery pack thermal management system can improve the energy conversion efficiency of the battery pack by optimizing the operating temperature of the battery pack, thereby extending the cruising range of electric vehicles or hybrid vehicles. The thermal management system also helps to keep the battery pack in a normal working state and reduce the risk of vehicle accidents caused by battery pack failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a structural diagram of the battery module according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic structural diagram of a thermal management system according to an embodiment of the present utility model;

[0028] Description of reference numerals:

[0029] 1. Battery cell module; 2. Direct cooling plate; 3. Liquid cooling plate;

[0030] 4. Refrigeration system; 401, direct cooling pipeline; 4011, direct cooling inlet pipe; 4012, direct cooling outlet pipe;

[0031] 402, refrigeration assembly; 4021, condenser; 4022, compressor; 4023, evaporator; 4024, first three-way connector; 4025, second three-way connector; 4026, second three-way valve; 4027, first three-way valve;

[0032] 5. Liquid cooling circuit; 501. Battery cooler; 5011. Expansion valve; 502. Liquid cooling inlet pipe; 503. Heating unit; 504. Liquid cooling outlet pipe; 505. Pumping unit. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0034] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0035] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0036] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Example 1

[0039] This embodiment relates to a battery pack thermal management system, which can cool the battery cell module 1 more quickly through the cooperation of the direct cooling plate 2 and the liquid cooling plate 3, with high cooling efficiency.

[0040] In terms of overall structure, Figure 1 and Figure 2 As shown, the battery pack thermal management system of this embodiment includes a direct cooling circuit and a liquid cooling circuit 5. The direct cooling circuit includes a direct cooling plate 2, and a refrigeration system 4 connected to the direct cooling plate 2. The refrigeration system 4 is used to cool the refrigerant in the direct cooling circuit. The direct cooling plate 2 is used to cool one of the top and bottom of the battery cell module 1. The liquid cooling circuit 5 includes a battery cooler 501 connected to the refrigeration system 4, and a liquid cooling plate 3 connected to the battery cooler 501. The liquid cooling plate 3 is used to cool the other of the top and bottom of the battery cell module 1.

[0041] At this time, as set above, the top and bottom of the battery module 1 can be cooled simultaneously by the direct cooling plate 2 and the liquid cooling plate 3, which is beneficial to increase the heat exchange area between the thermal management system and the battery system, and improve the heat exchange capacity of the battery under high load conditions such as fast charging, and effectively reduce the problem of excessive temperature of the battery pack caused by using only the liquid cooling plate 3 or the direct cooling plate 2 for cooling.

[0042] Moreover, when cooling the battery cell module 1, the direct cooling plate 2 can directly contact the surface of the battery module to quickly take away the heat, and the liquid cooling plate 3 can provide a more uniform cooling effect. The direct cooling plate 2 and the liquid cooling plate 3 can be flexibly adjusted under different environmental conditions to adapt to a wider operating temperature range. In addition, it is worth mentioning that both the direct cooling plate 2 and the liquid cooling plate 3 can be preferably connected to the battery cell module 1 through structural adhesive or thermally conductive structural adhesive to ensure reliable connection and good thermal conductivity. The preferred adhesive layer thickness is between 0.01 and 5 mm, for example, it can be 0.01 mm, 3 mm or 5 mm.

[0043] In addition, the direct cooling plate 2 and the liquid cooling plate 3 are combined to cool the battery cell module 1 at the same time, which can better balance the temperature of the battery cell module 1, reduce the temperature gradient inside the battery cell module 1, and improve the temperature consistency of the battery cell module 1. The setting of the direct cooling plate 2 and the liquid cooling plate 3 provides redundancy for the battery pack thermal management system, so that when one of the direct cooling plate 2 or the liquid cooling plate 3 fails to cool, the other can continue to work, ensuring the safe operation of the battery cell module 1 and improving the installation safety of the battery pack. At the same time, the relevant structural parts not mentioned in the battery pack thermal management system in this embodiment can refer to the various structures in the battery pack thermal management system well known to those skilled in the art, and will not be described in detail here.

[0044] It should be mentioned that, in this embodiment, as a preferred implementation form, see Figure 2 As shown, the refrigeration system 4 includes a direct cooling pipeline 401 and a refrigeration component 402 connected to the direct cooling pipeline 401. The direct cooling pipeline 401 includes a direct cooling inlet pipe 4011 connected between the inlet of the direct cooling plate 2 and the outlet of the refrigeration component 402, and a direct cooling outlet pipe 4012 connected between the outlet of the direct cooling plate 2 and the inlet of the refrigeration component 402. A first three-way valve 4027 is provided on the direct cooling inlet pipe 4011, and the direct cooling inlet pipe 4011 is connected to the direct cooling outlet pipe 4012 through the first three-way valve 4027.

[0045] In the process of cooling the battery cell module 1 by the direct cooling circuit, the refrigerant in the refrigeration component 402 reaches the direct cooling plate 2 from the outlet of the refrigeration component 402 through the direct cooling inlet pipe 4011. The refrigerant absorbs the heat generated by the battery module in the direct cooling plate 2. The heated refrigerant returns to the refrigeration component 402 through the direct cooling outlet pipe 4012 for cooling. The refrigerant directly contacts the surface of the battery module and can quickly take away the heat, ensuring that the battery is cooled in a short time. In addition, the setting of the first three-way valve 4027 allows the refrigerant to directly enter the direct cooling outlet pipe 4012 from the direct cooling inlet pipe 4011 when the battery pack does not need to be cooled, thereby reducing unnecessary refrigerant circulation and saving energy.

[0046] In addition, in this embodiment, as a preferred implementation form, see Figure 2As shown, the battery cooler 501 includes an expansion valve 5011 located upstream of the first three-way valve 4027. The battery cooler 501 is connected to the direct cooling inlet pipe 4011 via the expansion valve 5011. The expansion valve 5011 reduces the pressure of the refrigerant through throttling, thereby lowering the temperature of the refrigerant. This ensures that the refrigerant reaches a lower temperature before entering the direct cooling plate 2, thereby improving cooling efficiency.

[0047] In addition, the expansion valve 5011 can also automatically adjust the pressure and temperature of the refrigerant according to the temperature changes of the battery module, ensuring that the refrigerant is in the optimal cooling state when entering the direct cooling plate 2, and avoiding local overcooling or overheating of the refrigerant, thereby improving the uniformity of cooling and extending the service life of the battery module.

[0048] Among them, in this embodiment, as a preferred implementation form, the battery cooler 501 has a heat exchanger connected to the expansion valve 5011, the liquid cooling plate 3 is connected in series with the battery cooler 501 through the heat exchanger, and the refrigerant in the direct cooling circuit and the coolant in the liquid cooling circuit 5 exchange heat through the heat exchanger.

[0049] Under the action of the heat exchanger, the refrigerant can exchange heat with the coolant in the battery cooler 501, and then enter the direct cooling plate 2 to cool the battery pack, and the coolant will enter the liquid cooling plate 3 through the liquid cooling circuit 5 to cool the battery pack body, so that the direct cooling plate 2 and the liquid cooling plate 3 cool the battery cell module 1 at the same time, significantly improving the cooling efficiency of the cooling system.

[0050] And, in this embodiment, as a preferred implementation form, see Figure 2 As shown, the inlet of the liquid cooling plate 3 and the coolant outlet of the heat exchanger are connected via a liquid cooling inlet pipe 502, the outlet of the liquid cooling plate 3 and the coolant inlet of the heat exchanger are connected via a liquid cooling outlet pipe 504, a heating unit 503 is connected in series to the liquid cooling inlet pipe 502, and a pumping unit 505 is connected in series to the liquid cooling outlet pipe 504.

[0051] When the temperature of the battery cell module 1 is too low, the cooling liquid can be heated by the heating unit 503 connected in series on the liquid cooling inlet pipe 502. The heated cooling liquid flows into the liquid cooling plate 3 along the liquid cooling inlet pipe 502, and the liquid cooling plate 3 heats the battery cell module 1 to ensure the startup and normal operation of the battery module in a low temperature environment. After that, the cooling liquid will flow back to the heat exchanger along the pumping unit 505 on the liquid cooling outlet pipe 504, thereby completing a cycle.

[0052] It should be noted that, in this embodiment, as a preferred implementation form, see Figure 2As shown, the refrigeration component 402 includes a condenser 4021, a compressor 4022, and an evaporator 4023. The inlet of the condenser 4021 is connected to the outlet of the compressor 4022, the outlet of the condenser 4021 is connected to the inlet of the evaporator 4023, and the outlet of the evaporator 4023 is connected to the inlet of the compressor 4022.

[0053] The refrigeration assembly 402 further includes a first three-way connector 4024, a second three-way connector 4025, and a second three-way valve 4026. The inlet of the second three-way valve 4026 is connected to the outlet of the condenser 4021, the first outlet of the second three-way valve 4026 is connected to the inlet of the evaporator 4023, the second outlet of the second three-way valve 4026 is connected to the inlet of the expansion valve 5011, the first inlet connector of the first three-way connector 4024 is connected to the outlet of the evaporator 4023, and the outlet of the first three-way connector 4024 is connected to the outlet of the evaporator 4023. The outlet connector is connected to the inlet of the compressor 4022, the second inlet connector of the first three-way connector 4024 is connected to the outlet connector of the second three-way connector 4025, the first inlet connector of the second three-way connector 4025 is connected to the second outlet of the first three-way valve 4027, and the second inlet of the second three-way connector 4025 is connected to the outlet of the direct cooling plate 2, the first outlet of the first three-way valve 4027 is connected to the inlet of the direct cooling plate 2, and the inlet of the first three-way valve 4027 is connected to the outlet of the expansion valve 5011.

[0054] First, the compressor 4022 starts working, compressing the low-pressure gaseous refrigerant into a high-pressure and high-temperature gaseous refrigerant. The gaseous refrigerant enters the condenser 4021 through the outlet of the compressor 4022. At this time, the high-pressure and high-temperature gaseous refrigerant enters the condenser 4021, releases heat in the condenser 4021, and becomes a high-pressure and low-temperature liquid refrigerant after cooling. The liquid refrigerant then reaches the second three-way valve 4026. According to actual needs, the second three-way valve 4026 is connected to the evaporator 4023 or to the direct cooling inlet pipe 4011.

[0055] When the battery cell module 1 does not need to be cooled, the second three-way valve 4026 selects to direct the refrigerant to the evaporator 4023, and the high-pressure and low-temperature liquid refrigerant enters the evaporator 4023. At this time, the liquid refrigerant absorbs heat from the surrounding environment (such as air) and becomes a low-pressure and low-temperature gaseous refrigerant, and then returns to the compressor 4022 through the first three-way connector 4024, so that the refrigerant completes a cycle.

[0056] When the battery cell module 1 needs to be cooled, the second three-way valve 4026 chooses to direct the refrigerant to the direct cooling inlet pipe 4011, and the high-pressure and low-temperature liquid refrigerant enters the direct cooling inlet pipe 4011. Since the expansion valve 5011 is located upstream of the first three-way valve 4027, and the expansion valve 5011 is connected to the direct cooling inlet pipe 4011, that is, the outlet of the second three-way valve 4026 is connected to the inlet of the expansion valve 5011, the liquid refrigerant passes through the expansion valve 5011, and the expansion valve 5011 reduces the pressure and temperature of the refrigerant through the throttling effect, turning it into a low-pressure and low-temperature liquid refrigerant.

[0057] When only the direct cooling plate 2 is needed to work, the liquid refrigerant enters the first three-way valve 4027. At the same time, the liquid refrigerant does not exchange heat with the liquid cooling circuit 5. The first three-way valve 4027 chooses to guide the liquid refrigerant to the direct cooling plate 2. The low-pressure and low-temperature liquid refrigerant enters the direct cooling plate 2. In the direct cooling plate 2, the liquid refrigerant absorbs the heat generated by the battery module and becomes a low-pressure and low-temperature gaseous refrigerant. It is then guided to the compressor 4022 through the second three-way connector 4025 and the first three-way connector 4024 in turn, so that the refrigerant completes a cycle.

[0058] When only the liquid cooling plate 3 is required to work, the liquid refrigerant first exchanges heat with the coolant in the liquid cooling circuit 5. The cooled coolant can flow into the liquid cooling plate 3 along the liquid cooling circuit 5, and then flow back to the battery cooler 501 through the outlet of the liquid cooling plate 3, and exchange heat with the liquid refrigerant again. The refrigerant undergoing heat exchange is guided by the first three-way valve 4027 to the second three-way joint 4025, and after passing through the first three-way joint 4024 again, it is guided to the compressor 4022, so that the refrigerant completes one cycle.

[0059] When the liquid cooling plate 3 and the direct cooling plate 2 need to work at the same time, the liquid refrigerant first undergoes heat exchange with the coolant in the liquid cooling circuit 5. The cooled coolant can flow into the liquid cooling plate 3 along the liquid cooling circuit 5, and then flow back to the battery cooler 501 through the outlet of the liquid cooling plate 3, and exchange heat with the liquid refrigerant again. The refrigerant undergoing heat exchange is guided to the direct cooling plate 2 by the first three-way valve 4027, and the low-pressure and low-temperature liquid refrigerant enters the direct cooling plate 2. In the direct cooling plate 2, the liquid refrigerant absorbs the heat generated by the battery module and becomes a low-pressure and low-temperature gaseous refrigerant, and then is guided to the compressor 4022 through the second three-way joint 4025 and the first three-way joint 4024 in turn, so that the refrigerant completes one cycle.

[0060] Example 2

[0061] This embodiment relates to an electrical device, which is equipped with the battery pack thermal management system of embodiment 1. Through effective thermal management, system failures caused by excessively high or low temperatures can be reduced, the reliability of the electrical device can be improved, and the battery pack can be maintained within an appropriate temperature range, which can improve the charging efficiency of the battery pack, shorten its charging time, and thus improve the user experience.

[0062] In a preferred embodiment, the power-consuming device is an electric vehicle or hybrid vehicle, and the refrigeration system 4 is the air conditioning refrigeration system in the electric vehicle or hybrid vehicle. The refrigerant in the refrigeration system 4 not only cools the cockpit of the electric vehicle or hybrid vehicle, but also cools the battery module 1. This sharing of refrigeration resources allows for more efficient use of refrigeration resources, reduces energy waste, and improves overall system energy efficiency.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack thermal management system, characterized by: Including direct cooling circuit and liquid cooling circuit; The direct cooling circuit includes a direct cooling plate and a refrigeration system connected to the direct cooling plate, the refrigeration system is used to cool the refrigerant in the direct cooling circuit, and the direct cooling plate is used to cool one of the top and bottom of the battery cell module; The liquid cooling circuit includes a battery cooler connected to the refrigeration system and a liquid cooling plate connected to the battery cooler, and the liquid cooling plate is used to cool the other of the top and the bottom of the battery module.

2. The battery pack thermal management system according to claim 1, characterized in that: The refrigeration system includes a direct cooling pipeline and a refrigeration component connected to the direct cooling pipeline.

3. The battery pack thermal management system according to claim 2, characterized in that: The direct cooling pipeline includes a direct cooling inlet pipe connected between the inlet of the direct cooling plate and the outlet of the refrigeration component, and a direct cooling outlet pipe connected between the outlet of the direct cooling plate and the inlet of the refrigeration component. A first three-way valve is provided on the direct cooling inlet pipe, and the direct cooling inlet pipe is connected to the direct cooling outlet pipe through the first three-way valve.

4. The battery pack thermal management system according to claim 3, characterized in that: The battery cooler includes an expansion valve located upstream of the first three-way valve, and the battery cooler is connected to the direct cooling inlet pipe through the expansion valve.

5. The battery pack thermal management system according to claim 4, characterized in that: The battery cooler includes a heat exchanger connected to the expansion valve, the liquid cooling plate is connected in series with the battery cooler through the heat exchanger, and the refrigerant in the direct cooling circuit and the coolant in the liquid cooling circuit exchange heat through the heat exchanger.

6. The battery pack thermal management system according to claim 5, characterized in that: The inlet of the liquid cooling plate and the coolant outlet of the heat exchanger are connected via a liquid cooling inlet pipe, and the outlet of the liquid cooling plate and the coolant inlet of the heat exchanger are connected via a liquid cooling outlet pipe; The liquid cooling inlet pipe is connected in series with a heating unit, and / or the liquid cooling outlet pipe is connected in series with a pumping unit.

7. The battery pack thermal management system according to any one of claims 4 to 6, characterized in that: The refrigeration assembly includes a condenser, a compressor, and an evaporator; The inlet of the condenser is connected to the outlet of the compressor, the outlet of the condenser is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor.

8. The battery pack thermal management system according to claim 7, characterized in that: The refrigeration assembly includes a first three-way connector, a second three-way connector and a second three-way valve; The inlet of the second three-way valve is connected to the outlet of the condenser, the first outlet of the second three-way valve is connected to the inlet of the evaporator, and the second outlet of the second three-way valve is connected to the inlet of the expansion valve; A first inlet joint of a first three-way joint is connected to the outlet of the evaporator, an outlet joint of the first three-way joint is connected to the inlet of the compressor, and a second inlet joint of the first three-way joint is connected to the outlet joint of the second three-way joint; The first inlet joint of the second three-way joint is connected to the second outlet of the first three-way valve, and the second inlet of the second three-way joint is connected to the outlet of the direct cooling plate; The first outlet of the first three-way valve is connected to the inlet of the direct cooling plate, and the inlet of the first three-way valve is connected to the outlet of the expansion valve.

9. An electrical device, characterized in that: The electrical device is provided with a battery pack thermal management system according to any one of claims 1 to 8.

10. The electrical device according to claim 9, characterized in that: The power-consuming device is an electric vehicle or a hybrid vehicle; The refrigeration system is an air-conditioning refrigeration system in the electric vehicle or hybrid vehicle.

Images