Battery thermal management system and electric vehicle

Abstract

The embodiment of the invention provides a battery thermal management system and an electric vehicle, and relates to the technical field of new energy vehicles. The battery thermal management system comprises a direct cooling plate and an air conditioning system, and one surface of the direct cooling plate is in contact with the battery module. The air conditioning system comprises a compressor and a radiator. The direct cooling plate is of a double-layer composite structure and comprises an outer-layer cooling plate and an inner-layer cooling plate. The inner-layer cold plate and the outer-layer cold plate are both of a hollow structure, and the outer-layer cold plate is arranged outside the inner-layer cold plate in a sleeving mode. The compressor and the radiator are connected with the two ends of the inner-layer cold plate through refrigerant pipelines respectively. The situation that the temperature of the battery module is too low / too high under the direct cooling / direct heating working condition can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a battery thermal management system and an electric vehicle. Background Art

[0002] In the field of new energy vehicles, the direct cooling and heating system of power batteries has great cost advantages. The optimal operating temperature range of power batteries is between 20℃ and 40℃.

[0003] However, in the direct cooling and direct heating system, the refrigerant directly exchanges heat with the power battery through the direct cooling plate. Under direct cooling conditions, the power battery temperature is low, affecting the battery capacity activity and life; while under direct heating conditions, the power battery temperature is too high, which will greatly affect the battery life. Summary of the invention

[0004] The objectives of the present invention include, for example, providing a battery thermal management system and an electric vehicle, which can at least partially solve the above-mentioned technical problems.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a battery thermal management system, including a direct cooling plate and an air conditioning system; one side of the direct cooling plate is in contact with a battery module;

[0007] The air conditioning system includes a compressor and a radiator;

[0008] The direct cold plate is a double-layer composite structure, including an outer cold plate and an inner cold plate; the inner cold plate and the outer cold plate are both hollow structures, and the outer cold plate is sleeved outside the inner cold plate;

[0009] The compressor and the radiator are connected to two ends of the inner cold plate through refrigerant pipelines respectively.

[0010] Optionally, the battery thermal management system further includes a refrigerant connecting pipe; the refrigerant connecting pipe includes a first refrigerant connecting pipe and a second refrigerant connecting pipe;

[0011] One end of the first refrigerant connecting pipe is connected to the outlet of the refrigerant pipeline, and the other end is connected to the inlet of the refrigerant flow channel formed in the inner cold plate;

[0012] One end of the second refrigerant connecting pipe is connected to the inlet of the refrigerant pipeline, and the other end is connected to the outlet of the refrigerant flow channel.

[0013] Optionally, the battery thermal management system further includes an internal circulation subsystem; the internal circulation subsystem includes a coolant pipeline, a water pump, and a coolant flow channel formed by the inner surface of the outer cold plate and the outer surface of the inner cold plate;

[0014] The two ends of the coolant pipeline are respectively connected to the inlet and outlet of the coolant flow channel;

[0015] The water pump is arranged on the coolant pipeline and is located outside the direct cooling plate.

[0016] Optionally, the battery thermal management system comprises a plurality of the direct cooling plates, and the coolant channels of every two adjacent direct cooling plates are connected by a first connecting member;

[0017] The refrigerant flow channels of every two adjacent direct cooling plates are connected by a second connecting piece.

[0018] Optionally, the battery thermal management system further includes a refrigerant header; the refrigerant header includes a first refrigerant header and a second refrigerant header;

[0019] The first refrigerant header is connected to one end of the first refrigerant connecting pipe; the second refrigerant header is connected to one end of the second refrigerant connecting pipe;

[0020] The other end of the first refrigerant manifold is connected to the inlet end of the inner cold plate of the liquid inlet direct cooling plate, so as to allow the refrigerant to enter the refrigerant flow channel in each of the inner cold plates connected to the first refrigerant manifold through the compressor; wherein the liquid inlet direct cooling plate is each two non-adjacent direct cooling plates in each of the direct cooling plates;

[0021] The other end of the second refrigerant collecting pipe is connected to the inlet end of the inner cold plate of the liquid outlet direct cooling plate, so as to allow the refrigerant to flow out from the refrigerant flow channel of each of the liquid outlet direct cooling plates and enter the inlet of the refrigerant pipeline; wherein the liquid outlet direct cooling plate is the direct cooling plate among the direct cooling plates except the liquid inlet direct cooling plate.

[0022] Optionally, the battery thermal management system further includes a thermally conductive silicone pad;

[0023] The shape of the thermally conductive silicone pad is adapted to the direct cooling plate, and is arranged between the contact surface of each direct cooling plate and the battery module.

[0024] Optionally, the air conditioning system further comprises a four-way valve; the four-way valve comprises a first interface, a second interface, a third interface and a fourth interface, the first interface is arranged opposite to the third interface, and the second interface is arranged opposite to the fourth interface;

[0025] The four-way valve is arranged between the radiator and the compressor, and the outlet of the compressor is connected to the first interface, the inlet of the compressor is connected to the fourth interface, and the radiator is connected to the third interface.

[0026] Optionally, the refrigerant pipeline includes a first refrigerant branch and a second refrigerant branch;

[0027] One end of the first refrigerant branch is connected to the inlet of the refrigerant pipeline, and the other end is connected to the outlet of the compressor, and an on-off valve is provided on the first refrigerant branch;

[0028] One end of the second refrigerant branch is communicated with the inlet of the refrigerant pipeline, and the other end is connected to the second interface of the four-way valve.

[0029] Optionally, the refrigerant pipeline further includes a third refrigerant branch and a fourth refrigerant branch;

[0030] One end of the third refrigerant branch is connected to the radiator, and the other end is connected to the outlet of the refrigerant pipeline;

[0031] One end of the fourth refrigerant branch is connected to the radiator, and the other end is connected to the outlet of the refrigerant pipeline;

[0032] An electronic expansion valve is respectively arranged on the third refrigerant branch path and the fourth refrigerant branch path.

[0033] In a second aspect, an embodiment of the present invention provides an electric vehicle, comprising a battery thermal management system as described in any one of the above.

[0034] The beneficial effects of the embodiments of the present invention include, for example:

[0035] By setting a double-layer composite direct cooling plate, and setting the outer cold plate and the inner cold plate of the direct cooling plate to a hollow structure, when the refrigerant performs thermal management on the battery module through the direct cooling plate, the refrigerant flows through the inside of the inner cold plate, and the gap between the inner cold plate and the outer cold plate avoids direct contact between the battery module and the inner cold plate, thereby alleviating the situation where the battery module temperature is too high / too low. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 An architecture diagram of a battery thermal management system provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the structure of a direct cooling plate provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a refrigerant connecting pipe and a refrigerant collecting pipe provided in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of an internal circulation subsystem provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of a thermally conductive silicone pad provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of the structure of an air conditioning system provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of the flow direction of coolant and refrigerant under direct cooling conditions provided in an embodiment of the present invention.

[0044] Icons: 01-battery thermal management system; 10-direct cooling plate; 11-outer cooling plate; 12-inner cooling plate; 20-air conditioning system; 21-compressor; 22-radiator; 23-refrigerant pipeline; 24-second connecting piece; 30-battery module; 40-refrigerant connecting pipe; 41-first refrigerant connecting pipe; 42-second refrigerant connecting pipe; 50-internal circulation subsystem; 51-coolant pipeline; 52-water pump; 53-first connecting piece Connector; 60-refrigerant collecting pipe; 61-first refrigerant collecting pipe; 62-second refrigerant collecting pipe; 70-thermal conductive silicone pad; 25-four-way valve; 251-first interface; 252-second interface; 253-third interface; 254-fourth interface; 231-first refrigerant branch; 232-second refrigerant branch; 233-third refrigerant branch; 234-fourth refrigerant branch; 26-on-off valve; 27-electronic expansion valve. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0048] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0050] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0051] In terms of thermal management of new energy vehicle power batteries, many manufacturers currently install direct cooling plates on battery modules and connect the direct cooling plates to the air conditioning circulation system of new energy vehicles, so that the refrigerant of the air conditioning system passes through the direct cooling plates, thereby managing the thermal performance of the power batteries. In this way, the air conditioning system of new energy vehicles can be fully utilized, and the heat dissipation of battery modules can be well performed.

[0052] However, due to the refrigerant circulation characteristics of vehicle air conditioners, there are problems such as low evaporation temperature (<15°C) under direct cooling conditions and too high condensation temperature (>50°C) under direct heating conditions. The optimal operating temperature range of power batteries is between 20°C and 40°C, which means that when the refrigerant directly exchanges heat with the power battery, the power battery temperature is low under direct cooling conditions, affecting the battery capacity activity and life; the power battery temperature is too high under direct heating conditions, which greatly affects the battery life. In addition, because the outlet needs to be kept superheated or supercooled, the power battery module often has a large temperature difference between the refrigerant outlet and other areas.

[0053] Based on the above situation, the present invention provides a battery thermal management system and an electric vehicle, which can effectively alleviate the above technical problems.

[0054] Please refer to Figure 1 The embodiment of the present invention provides a battery thermal management system 01, including a direct cooling plate 10 and an air conditioning system 20. One side of the direct cooling plate 10 is in contact with a battery module 30. The air conditioning system 20 includes a compressor 21 and a radiator 22.

[0055] The direct cold plate 10 is a double-layer composite structure, including an outer cold plate 11 and an inner cold plate 12. Both the inner cold plate 12 and the outer cold plate 11 are hollow structures, and the outer cold plate 11 is sleeved outside the inner cold plate 12.

[0056] The compressor 21 and the radiator 22 are connected to two ends of the inner cold plate 12 through refrigerant pipes 23 , respectively.

[0057] like Figure 1 as well as Figure 2 As shown, the direct cooling plate 10 is a double-layer composite structure. When the air-conditioning system 20 is in a direct cooling state, the low-temperature and low-pressure liquid refrigerant passes through the inner cold plate 12 of the direct cooling plate 10, and then returns to the compressor 21 of the air-conditioning system 20 through the refrigerant pipeline 23. Since the direct cooling plate 10 is a double-layer structure, when the refrigerant passes through the inner cold plate 12 of the direct cooling plate 10, the gap between the inner cold plate 12 and the outer cold plate 11 can neutralize the temperature of the refrigerant, so that the temperature of the outer surface of the outer cold plate 11 in direct contact with the battery module 30 will be higher than the temperature of the outer surface of the inner cold plate 12, thereby avoiding the situation where the temperature of the battery module 30 is too low.

[0058] Alternatively, if Figure 3 As shown, the battery thermal management system 01 further includes a refrigerant connecting pipe 40. The refrigerant connecting pipe 40 includes a first refrigerant connecting pipe 41 and a second refrigerant connecting pipe 42.

[0059] One end of the first refrigerant connecting pipe 41 is connected to the outlet of the refrigerant pipeline 23 , and the other end is connected to the inlet of the refrigerant flow channel formed in the inner cold plate 12 .

[0060] One end of the second refrigerant connecting pipe 42 is connected to the inlet of the refrigerant pipeline 23 , and the other end is connected to the outlet of the refrigerant flow path.

[0061] The refrigerant connecting pipe 40 can be a connecting pipe used to connect the refrigerant pipeline 23 with the internal space (i.e., the refrigerant flow channel) of the inner cold plate 12 of the direct cold plate 10. The first refrigerant connecting pipe 41 can be connected to the inlet of the refrigerant flow channel, and the second refrigerant connecting pipe 42 can be connected to the outlet of the refrigerant flow channel. When the battery thermal management system 01 is working, the refrigerant can flow out from the outlet of the refrigerant pipeline 23 to the inlet of the refrigerant flow channel, and after passing through the refrigerant flow channel, it flows out from the outlet of the refrigerant flow channel and returns to the refrigerant pipeline 23 from the inlet of the refrigerant pipeline 23.

[0062] Alternatively, if Figure 4 As shown, the battery thermal management system 01 further includes an internal circulation subsystem 50 . The internal circulation subsystem 50 includes a coolant pipeline 51 , a water pump 52 , and a coolant flow channel formed by the inner surface of the outer cold plate 11 and the outer surface of the inner cold plate 12 .

[0063] The two ends of the coolant pipeline 51 are connected to the inlet and outlet of the coolant flow channel respectively. The water pump 52 is arranged on the coolant pipeline 51 and is located outside the direct cooling plate 10 .

[0064] The internal circulation subsystem 50 can be a coolant circulation system provided on the direct cooling plate 10 in addition to the refrigerant circulation of the air conditioning system 20. Since the coolant has a high specific heat capacity, it can store more heat and has a small temperature change. Therefore, in order to better neutralize the heat when the refrigerant passes through the direct cooling plate 10, a coolant pipeline 51 can be provided, and a water pump 52 can be provided on the coolant pipeline 51, and the coolant pipeline 51 is connected to the coolant flow channel formed by the inner surface of the outer cold plate 11 of the direct cooling plate 10 and the outer surface of the inner cold plate 12. When the refrigerant passes through the refrigerant flow channel, the water pump 52 is started and controlled by a controller that is connected to the water pump 52, so that the coolant circulates in the internal circulation subsystem 50, so that when the direct cooling condition is performed, the coolant temperature is higher than the refrigerant (evaporation temperature <15°C) temperature, and when the direct heating condition is performed, the coolant temperature is lower than the refrigerant (condensation temperature >50°C) temperature.

[0065] Alternatively, if Figure 3 and Figure 4 As shown, the battery thermal management system 01 includes a plurality of direct cooling plates 10 , and the coolant channels of every two adjacent direct cooling plates 10 are connected by a first connector 53 . The refrigerant channels of every two adjacent direct cooling plates 10 are connected by a second connector 24 .

[0066] As an optional embodiment, multiple parallel direct cooling plates 10 can be provided, and the coolant flow channels of every two adjacent direct cooling plates 10 are connected through a first connector 53. The refrigerant flow channels of every two adjacent direct cooling plates 10 are connected through a second connector 24. In this way, when the battery thermal management system 01 is in operation, both the coolant and the refrigerant can flow through each direct cooling plate 10, thereby increasing the thermal management area of ​​the direct cooling plate 10.

[0067] Alternatively, if Figure 3 As shown, the battery thermal management system 01 further includes a refrigerant header 60 . The refrigerant header 60 includes a first refrigerant header 61 and a second refrigerant header 62 .

[0068] The first refrigerant header 61 is connected to one end of the first refrigerant connection pipe 41. The second refrigerant header 62 is connected to one end of the second refrigerant connection pipe 42.

[0069] The other end of the first refrigerant manifold 61 is connected to the inlet end of the inner layer cold plate 12 of the liquid inlet direct cooling plate 10, so as to allow the refrigerant to enter the refrigerant flow channel in each inner layer cold plate 12 connected to the first refrigerant manifold 61 through the compressor 21. The liquid inlet direct cooling plate 10 is each two non-adjacent direct cooling plates 10 in each direct cooling plate 10.

[0070] The other end of the second refrigerant manifold 62 is connected to the inlet end of the inner layer cold plate 12 of the liquid outlet direct cooling plate 10, so as to allow the refrigerant to flow out from the refrigerant flow channel of each liquid outlet direct cooling plate 10 and enter the inlet of the refrigerant pipeline 23. Among them, the liquid outlet direct cooling plate 10 is the direct cooling plate 10 of each direct cooling plate 10 except the liquid inlet direct cooling plate 10.

[0071] In order to enable the refrigerant to flow through each direct cooling plate 10 more quickly when the battery thermal management system 01 is in operation, the direct cooling plate 10 can be divided into a liquid inlet direct cooling plate 10 and a liquid outlet direct cooling plate 10, the liquid inlet direct cooling plate 10 and the liquid outlet direct cooling plate 10 are arranged at intervals, and each liquid inlet direct cooling plate 10 is a group with a liquid outlet direct cooling plate 10, which are connected through a second connector 24. A first refrigerant collector 61 is arranged at the refrigerant flow channel inlet of each liquid inlet direct cooling plate 10, so that the refrigerant in the refrigerant pipeline 23 enters the first refrigerant collector 61 through the first refrigerant connecting pipe 41, and then passes into the refrigerant flow channel of each liquid inlet direct cooling plate 10. A second refrigerant collector 62 is arranged at the refrigerant flow channel outlet of each liquid inlet direct cooling plate 10, so that the refrigerant flowing out of each liquid outlet direct cooling plate 10 can pass through the second refrigerant collector 62 and return to the refrigerant pipeline 23 from the second refrigerant connecting pipe 42.

[0072] Alternatively, if Figure 5 As shown, the battery thermal management system 01 further includes a thermally conductive silicone pad 70 . The shape of the thermally conductive silicone pad 70 is adapted to the direct cooling plate 10 , and is disposed between the contact surface of each direct cooling plate 10 and the battery module 30 .

[0073] The provision of the thermally conductive silicone pad 70 prevents the battery module 30 from directly contacting the direct cooling plate 10 , further ensuring the safety of the battery module 30 .

[0074] Alternatively, if Figure 6 As shown, the air conditioning system 20 further includes a four-way valve 25. The four-way valve 25 includes a first interface 251, a second interface 252, a third interface 253 and a fourth interface 254. The first interface 251 is disposed opposite to the third interface 253, and the second interface 252 is disposed opposite to the fourth interface 254.

[0075] The four-way valve 25 is disposed between the radiator 22 and the compressor 21 , and the outlet of the compressor 21 is connected to the first interface 251 , the inlet of the compressor 21 is connected to the fourth interface 254 , and the radiator 22 is connected to the third interface 253 .

[0076] A four-way valve 25 is set between the radiator 22 and the compressor 21, so that the outlet of the compressor 21 is connected to the first interface 251, the inlet of the compressor 21 is connected to the fourth interface 254, and the radiator 22 is connected to the third interface 253, thereby realizing the normal operation of the air-conditioning system 20 under direct cooling and heating conditions.

[0077] Optionally, Figure 6 For example, the refrigerant pipeline 23 includes a first refrigerant branch path 231 and a second refrigerant branch path 232 .

[0078] One end of the first refrigerant branch 231 is connected to the inlet of the refrigerant pipeline 23 , and the other end is connected to the outlet of the compressor 21 . An on-off valve 26 is provided on the first refrigerant branch 231 .

[0079] One end of the second refrigerant branch path 232 is communicated with the inlet of the refrigerant pipeline 23 , and the other end is connected to the second interface 252 of the four-way valve 25 .

[0080] Optionally, Figure 6 For example, the refrigerant pipeline 23 further includes a third refrigerant branch 233 and a fourth refrigerant branch 234 .

[0081] One end of the third refrigerant branch path 233 is communicated with the radiator 22 , and the other end is communicated with the outlet of the refrigerant pipeline 23 .

[0082] One end of the fourth refrigerant branch path 234 is connected to the radiator 22 , and the other end is connected to the outlet of the refrigerant pipeline 23 .

[0083] An electronic expansion valve 27 is disposed on the third refrigerant branch path 233 and the fourth refrigerant branch path 234 , respectively.

[0084] See also Figure 6 as well as Figure 7 In direct cooling conditions, the controller can control the four-way valve 25 to open the first interface 251 and the third interface 253, close the second interface 252 and the fourth interface 254, control the on-off valve 26 to open, and adjust the electronic expansion valve 27 of the third refrigerant branch 233 to a closed state.

[0085] The compressor 21 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous state, enters the radiator 22 through the four-way valve 25 to cool and become a high-temperature and high-pressure liquid state, and the high-temperature and high-pressure liquid refrigerant is throttled by the expansion valve of the fourth refrigerant branch 234 to become a low-temperature and low-pressure liquid state, and enters the direct cooling plate 10 to evaporate, absorb the heat of the coolant, and become a low-temperature and low-pressure gaseous state, and then enters the compressor 21 through the on-off valve 26 of the first refrigerant branch 231, and repeats the cycle. At the same time, the controller controls the water pump 52 to rotate forward, so that the flow direction of the coolant in the internal circulation subsystem 50 is opposite to the flow direction of the refrigerant.

[0086] The refrigerant evaporates and absorbs heat in the direct cooling plate 10, and the temperature of the coolant decreases, thereby cooling the battery module 30. This structure allows the battery module 30 to avoid the lowest temperature of the direct cooling condition, and the circulation and mixing of the coolant in the internal circulation subsystem 50 can reduce the temperature difference, thereby reducing the temperature difference of the battery module 30.

[0087] and Figure 7The refrigerant flow direction shown is opposite to the coolant flow direction. In direct heating conditions, the controller can control the four-way valve 25 to connect the first interface 251 and the second interface 252, connect the third interface 253 and the fourth interface 254, control the on-off valve 26 to close, and adjust the electronic expansion valve 27 of the fourth refrigerant branch 234 to a closed state.

[0088] When the battery thermal management system 01 is running, the compressor 21 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous state, which enters the direct cooling plate 10 through the four-way valve 25 and the second refrigerant branch 232, and is cooled to become a high-temperature and high-pressure liquid. The high-temperature and high-pressure liquid refrigerant is throttled by the electronic expansion valve 27 of the third refrigerant branch 233 to become a low-temperature and low-pressure liquid, which is then passed into the radiator 22 to evaporate, becomes a low-temperature and low-pressure gaseous state, and enters the compressor 21, repeating the cycle.

[0089] At the same time, the controller controls the water pump 52 to reverse, so that the flow direction of the coolant in the internal circulation subsystem 50 is opposite to the flow direction of the refrigerant.

[0090] The refrigerant condenses and releases heat in the direct cooling plate 10, and the temperature of the coolant increases, thereby heating the battery module 30. This structure allows the battery module 30 to avoid the highest temperature (>50°C) of the direct heating condition, and the circulation and mixing of the coolant in the internal circulation subsystem 50 can reduce the temperature difference, thereby reducing the temperature difference of the battery module 30.

[0091] Based on the same inventive concept, an embodiment of the present invention provides an electric vehicle, which includes any one of the above-mentioned battery thermal management systems 01.

[0092] Regarding the above-mentioned electric vehicle, the specific functions of each unit therein have been described in detail in the embodiment of the battery thermal management system 01 provided in this specification, and will not be elaborated here.

[0093] The present invention has at least the following beneficial effects:

[0094] By setting a double-layer composite direct cooling plate, and setting the outer cold plate and the inner cold plate of the direct cooling plate to a hollow structure, when the refrigerant performs thermal management on the battery module through the direct cooling plate, the refrigerant flows through the inside of the inner cold plate, and the gap between the inner cold plate and the outer cold plate avoids direct contact between the battery module and the inner cold plate, thereby alleviating the situation where the battery module temperature is too high / too low.

[0095] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a module, a program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0096] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0097] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device, such as a personal computer, a server, or a network device, to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory ROM, Read-Only Memory, random access memory RAM, RandomAccess Memory, disk or optical disk, and other media that can store program codes.

[0098] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A battery thermal management system, characterized in that: It comprises a direct cooling plate (10) and an air conditioning system (20); one side of the direct cooling plate (10) is in contact with a battery module (30); The air conditioning system (20) comprises a compressor (21) and a radiator (22); The direct cooling plate (10) is a double-layer composite structure, comprising an outer cold plate (11) and an inner cold plate (12); the inner cold plate (12) and the outer cold plate (11) are both hollow structures, and the outer cold plate (11) is sleeved outside the inner cold plate (12); The compressor (21) and the radiator (22) are respectively connected to two ends of the inner cold plate (12) via refrigerant pipelines (23).

2. The battery thermal management system according to claim 1, characterized in that: The battery thermal management system (01) further comprises a refrigerant connecting pipe (40); the refrigerant connecting pipe (40) comprises a first refrigerant connecting pipe (41) and a second refrigerant connecting pipe (42); One end of the first refrigerant connecting pipe (41) is connected to the outlet of the refrigerant pipeline (23), and the other end is connected to the inlet of the refrigerant flow channel formed in the inner cold plate (12); One end of the second refrigerant connecting pipe (42) is connected to the inlet of the refrigerant pipeline (23), and the other end is connected to the outlet of the refrigerant flow channel.

3. The battery thermal management system according to claim 2, characterized in that: The battery thermal management system (01) further comprises an internal circulation subsystem (50); the internal circulation subsystem (50) comprises a coolant pipeline (51), a water pump (52), and a coolant flow channel formed by the inner surface of the outer cold plate (11) and the outer surface of the inner cold plate (12); The two ends of the coolant pipeline (51) are respectively connected to the inlet and outlet of the coolant flow channel; The water pump (52) is arranged on the coolant pipeline (51) and is located outside the direct cooling plate (10).

4. The battery thermal management system according to claim 3, characterized in that: The battery thermal management system (01) comprises a plurality of direct cooling plates (10), and the coolant flow channels of every two adjacent direct cooling plates (10) are connected via a first connecting member (53); The refrigerant flow passages of every two adjacent direct cooling plates (10) are connected via a second connecting piece (24).

5. The battery thermal management system according to claim 4, characterized in that: The battery thermal management system (01) further comprises a refrigerant header (60); the refrigerant header (60) comprises a first refrigerant header (61) and a second refrigerant header (62); The first refrigerant collecting pipe (61) is connected to one end of the first refrigerant connecting pipe (41); the second refrigerant collecting pipe (62) is connected to one end of the second refrigerant connecting pipe (42); The other end of the first refrigerant manifold (61) is connected to the inlet end of the inner cold plate (12) of the liquid inlet direct cooling plate (10), so as to allow the refrigerant to enter the refrigerant flow channel in each of the inner cold plates (12) connected to the first refrigerant manifold (61) through the compressor (21); wherein the liquid inlet direct cooling plate (10) is each two non-adjacent direct cooling plates (10) in each of the direct cooling plates (10); The other end of the second refrigerant collecting pipe (62) is connected to the inlet end of the inner layer cold plate (12) of the liquid outlet direct cooling plate (10), so as to allow the refrigerant to flow out from the refrigerant flow channel of each of the liquid outlet direct cooling plates (10) and enter the inlet of the refrigerant pipeline (23); wherein the liquid outlet direct cooling plate (10) is the direct cooling plate (10) among the direct cooling plates (10) except the liquid inlet direct cooling plate (10).

6. The battery thermal management system according to claim 4, characterized in that: The battery thermal management system (01) further comprises a thermally conductive silicone pad (70); The shape of the thermally conductive silicone pad (70) is adapted to the direct cooling plate (10), and is arranged between the contact surface between each direct cooling plate (10) and the battery module (30).

7. The battery thermal management system according to claim 4, characterized in that: The air conditioning system (20) further comprises a four-way valve (25); the four-way valve (25) comprises a first interface (251), a second interface (252), a third interface (253) and a fourth interface (254); the first interface (251) and the third interface (253) are arranged opposite to each other, and the second interface (252) and the fourth interface (254) are arranged opposite to each other; The four-way valve (25) is arranged between the radiator (22) and the compressor (21), and the outlet of the compressor (21) is connected to the first interface (251), the inlet of the compressor (21) is connected to the fourth interface (254), and the radiator (22) is connected to the third interface (253).

8. The battery thermal management system according to claim 7, characterized in that: The refrigerant pipeline (23) includes a first refrigerant branch (231) and a second refrigerant branch (232); One end of the first refrigerant branch (231) is connected to the inlet of the refrigerant pipeline (23), and the other end is connected to the outlet of the compressor (21), and an on-off valve (26) is provided on the first refrigerant branch (231); One end of the second refrigerant branch (232) is connected to the inlet of the refrigerant pipeline (23), and the other end is connected to the second interface (252) of the four-way valve (25).

9. The battery thermal management system according to claim 7, characterized in that: The refrigerant pipeline (23) further includes a third refrigerant branch (233) and a fourth refrigerant branch (234); One end of the third refrigerant branch (233) is connected to the radiator (22), and the other end is connected to the outlet of the refrigerant pipeline (23); One end of the fourth refrigerant branch (234) is connected to the radiator (22), and the other end is connected to the outlet of the refrigerant pipeline (23); An electronic expansion valve (27) is provided on the third refrigerant branch (233) and the fourth refrigerant branch (234), respectively.

10. An electric vehicle, characterized in that: The electric vehicle comprises a battery thermal management system (01) as claimed in any one of claims 1 to 9.

Images