Battery thermal management system

Abstract

The battery thermal management system comprises a top-bottom liquid cooling plate, a first liquid cooling device and a second liquid cooling device, the top-bottom liquid cooling plate is provided with a liquid cooling flow channel, the liquid cooling flow channel comprises a first flow channel opening and a second flow channel opening, the top-bottom liquid cooling plate exchanges heat with a battery, one end of the first liquid cooling device is communicated with the first flow channel opening, and the other end of the first liquid cooling device is communicated with the second flow channel opening. One end of the first liquid cooling device is communicated with the first flow channel opening, the other end of the first liquid cooling device is communicated with the second flow channel opening, one end of the second liquid cooling device is communicated with the first flow channel opening, and the other end of the second liquid cooling device is communicated with the second flow channel opening; the second liquid cooling device is configured to at least carry out liquid cooling on the battery in the overcharge state, so that too high temperature and too large temperature difference in the battery charging process can be avoided, particularly it can be guaranteed that the battery is in the overcharge process, the temperature of the battery is within a safe range, and the reliability of the battery is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery thermal management system. Background Art

[0002] The Battery Thermal Management System (BTMS) is a crucial component of new energy vehicles. Its primary function is to maintain the battery's optimal operating temperature by maintaining it within an appropriate temperature range through a closed-loop regulation system composed of a heat transfer medium, measurement and control units, and temperature control equipment. Battery temperature significantly impacts its performance, lifespan, and safety. Therefore, preventing excessive battery temperatures and large temperature differences is crucial to ensuring the safe and efficient operation of the battery system. Utility Model Content

[0003] The present application provides a battery thermal management system that can avoid excessive temperatures and large temperature differences during battery charging. In particular, it can ensure that when the battery is in the overcharging process, the battery temperature is within a safe range, thereby ensuring the reliability of the battery.

[0004] To solve the above problems, the present application provides a battery thermal management system, which includes:

[0005] The top and bottom liquid cooling plates are provided with liquid cooling channels, the liquid cooling channels including a first channel opening and a second channel opening, and the top and bottom liquid cooling plates perform heat exchange with the battery;

[0006] a first liquid cooling device, one end of the first liquid cooling device being connected to the first flow channel opening, and the other end of the first liquid cooling device being connected to the second flow channel opening;

[0007] a second liquid cooling device, one end of the second liquid cooling device being connected to the first flow channel opening, and the other end of the second liquid cooling device being connected to the second flow channel opening;

[0008] The first liquid cooling device is configured to at least cool the battery in a non-supercharged state, and the second liquid cooling device is configured to at least cool the battery in a supercharged state.

[0009] Furthermore, in the battery thermal management system provided in the present application, the battery thermal management system further includes a first three-way valve and a second three-way valve;

[0010] The first end of the first three-way valve is connected to the first flow channel, the second end of the first three-way valve is connected to one end of the first liquid cooling device, and the third end of the first three-way valve is connected to one end of the second liquid cooling device;

[0011] The first end of the second three-way valve is connected to the other end of the first liquid cooling device, the second end of the second three-way valve is connected to the second flow channel port, and the third end of the second three-way valve is connected to the other end of the second liquid cooling device.

[0012] Furthermore, in the battery thermal management system provided in the present application, the battery thermal management system further includes a liquid cooling socket;

[0013] The first end of the liquid cooling socket is connected to the third end of the first three-way valve, the second end of the liquid cooling socket is connected to the third end of the second three-way valve, the third end of the liquid cooling socket is connected to one end of the second liquid cooling device, and the fourth end of the liquid cooling socket is connected to the other end of the second liquid cooling device.

[0014] The first end and the third end of the liquid cooling socket are in communication, and the second end and the fourth end of the liquid cooling socket are in communication.

[0015] Furthermore, in the battery thermal management system provided in the present application, the top and bottom liquid cooling plates include a first liquid cooling plate and a second liquid cooling plate, and the liquid cooling flow channel includes a first liquid cooling flow channel and a second liquid cooling flow channel;

[0016] The first liquid cooling channel is provided in the first liquid cooling plate, and the second liquid cooling channel is provided in the second liquid cooling plate;

[0017] One end of the first liquid cooling channel and one end of the second liquid cooling channel are connected to the first channel opening using a first three-way joint, and the other end of the first liquid cooling channel and the other end of the second liquid cooling channel are connected to the second channel opening using a second three-way joint.

[0018] Furthermore, in the battery thermal management system provided in the present application, the first liquid cooling plate and the second liquid cooling plate are respectively located on two corresponding sides of the battery.

[0019] Furthermore, in the battery thermal management system provided in the present application, the liquid cooling flow rate of the first liquid cooling channel is smaller than the liquid cooling flow rate of the second liquid cooling channel; or / and,

[0020] The first liquid cooling plate includes a stamped liquid cooling plate, and the second liquid cooling plate includes an extruded liquid cooling plate.

[0021] Furthermore, in the battery thermal management system provided in the present application, the first liquid cooling device is arranged at the vehicle end, and the second liquid cooling device is arranged at the non-vehicle end, and the liquid cooling power of the first liquid cooling device is less than the liquid cooling power of the second liquid cooling device.

[0022] Furthermore, in the battery thermal management system provided in the present application, the battery thermal management system further includes an exhaust assembly;

[0023] One end of the exhaust component is connected to the first flow channel and one end of the first liquid cooling device respectively, and the other end of the exhaust component is connected to the outside.

[0024] Furthermore, in the battery thermal management system provided in the present application, the exhaust assembly includes an exhaust pipe and a third three-way valve;

[0025] Among them, the first end of the third three-way valve is connected to the first flow channel, the second end of the third three-way valve is connected to one end of the first liquid cooling device, the third end of the third three-way valve is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the outside.

[0026] Furthermore, in the battery thermal management system provided in the present application, the exhaust assembly includes a liquid injection pot and a fourth three-way valve;

[0027] Among them, the liquid injection pot is connected to the first end of the fourth three-way valve, the second end of the fourth three-way valve is connected to the second end of the third three-way valve, the third end of the fourth three-way valve is connected to one end of the first liquid cooling device, and the other end of the exhaust pipe is connected to the outside world through the liquid injection pot.

[0028] The battery thermal management system provided in the present application includes top and bottom liquid cooling plates, a first liquid cooling device and a second liquid cooling device. The top and bottom liquid cooling plates are provided with liquid cooling channels, and the liquid cooling channels include a first channel opening and a second channel opening. The top and bottom liquid cooling plates perform heat exchange with the battery. One end of the first liquid cooling device is connected to the first channel opening, and the other end of the first liquid cooling device is connected to the second channel opening. One end of the second liquid cooling device is connected to the first channel opening, and the other end of the second liquid cooling device is connected to the second channel opening. The first liquid cooling device is configured to perform liquid cooling on at least the battery in a non-supercharged state, and the second liquid cooling device is configured to perform liquid cooling on at least the battery in a supercharged state, thereby avoiding excessive temperature and excessive temperature difference during battery charging. In particular, it can ensure that the battery temperature is within a safe range when the battery is in the supercharge process, thereby ensuring the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A schematic block diagram of a battery thermal management system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0033] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0035] In addition, in this application, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood based on the specific implementation.

[0036] In related technologies, to shorten the charging time of electric vehicles, batteries are usually equipped with fast charging mode and supercharging mode (super fast charging mode). When the battery is in fast charging mode, an onboard air conditioning system can be added to the thermal management system to assist in cooling the battery. When the battery is in supercharging mode, it requires a lower water inlet temperature and a higher flow rate for the liquid cooling plate where the battery is located.

[0037] However, simply adding an onboard air conditioning system to the thermal management system to assist in cooling the battery cannot reduce the water inlet temperature of the liquid cooling plate to the preset temperature, and its flow rate cannot meet the requirements. As a result, when the battery is in supercharging mode, the battery thermal management system cannot effectively reduce the battery temperature, resulting in excessive temperature difference in the battery, which in turn affects the battery life.

[0038] To this end, the present application provides a battery thermal management system, which can avoid excessive temperature and excessive temperature difference during battery charging, and especially ensure that the battery temperature is within a safe range during supercharging, thereby ensuring the reliability of the battery.

[0039] See also Figure 1 , Figure 1 This is a schematic block diagram of a battery thermal management system provided in an embodiment of the present application. Figure 1 As shown, the present application provides a battery thermal management system, which includes:

[0040] The top and bottom liquid cooling plates 200 are provided with liquid cooling channels, which include a first channel opening and a second channel opening. The top and bottom liquid cooling plates 200 perform heat exchange with the battery 100.

[0041] A first liquid cooling device 300, one end of the first liquid cooling device 300 is connected to the first flow channel opening, and the other end of the first liquid cooling device 300 is connected to the second flow channel opening;

[0042] A second liquid cooling device 400, one end of the second liquid cooling device 400 is connected to the first flow channel opening, and the other end of the second liquid cooling device 400 is connected to the second flow channel opening;

[0043] The first liquid cooling device 300 is configured to at least cool the battery 100 in a non-supercharged state, and the second liquid cooling device 400 is configured to at least cool the battery 100 in a supercharged state.

[0044] In this embodiment, the first liquid cooling device 300 can be a vehicle-mounted liquid cooling device, that is, the first liquid cooling device 300 can be a liquid cooling device for an electric vehicle; the second liquid cooling device 400 can be a non-vehicle-mounted liquid cooling device, that is, the second liquid cooling device 400 can be a liquid cooling device installed at a charging station. Therefore, the cooling power of the first liquid cooling device 300 is much lower than that of the second liquid cooling device 400. The second liquid cooling device 400 can quickly reduce the temperature of the battery 100, thereby ensuring that the battery 100 temperature remains within a safe range during the supercharging process, thereby ensuring the reliability of the battery 100.

[0045] Meanwhile, a water pump, a heat exchange device, and a heater can be provided in the first liquid cooling device 300. Similarly, the second liquid cooling device 400 can also be configured using the first liquid cooling device 300, but the cooling power of the second liquid cooling device 400 needs to be much greater than that of the first liquid cooling device 300.

[0046] Specifically, the battery 100 mentioned in this application can be understood as a battery pack, which is liquid-cooled using top-bottom liquid cooling. The top-bottom liquid cooling technology achieves efficient temperature control by installing liquid cooling plates on the top and bottom of the battery 100 and using forced convection of the coolant in the channel to remove heat. Among them, when the first liquid cooling device 300 is used to liquid-cool the battery 100, under normal circumstances, the temperature at the liquid inlet of the top and bottom liquid cooling plates 200 can be 15°C, and the liquid cooling flow rate can be 10L / min; when the second liquid cooling device 400 is used to liquid-cool the battery 100, under normal circumstances, the temperature at the liquid inlet of the top and bottom liquid cooling plates 200 can be 10°C, and the liquid cooling flow rate can be 20L / min.

[0047] It should be noted that the primary reason for incorporating the second liquid cooling device 400 into the thermal management system in this application is that after the battery pack was cooled using top-to-bottom liquid cooling, the battery 100 was configured in supercharge mode (4C high-rate charging mode). It was discovered that the top-to-bottom liquid cooling method was unable to control the battery pack temperature and temperature differential within a safe range, leading to the inclusion of an onboard air conditioning system to assist in cooling the battery 100. However, even with the addition of the onboard air conditioning system to assist in cooling the battery 100, the battery pack temperature and temperature differential were still unable to be controlled within a safe range, leading to the inclusion of the second liquid cooling device 400 into the thermal management system, and the second liquid cooling device 400 was configured to cool at least the battery 100 in the supercharged state.

[0048] In addition, the non-supercharging state mentioned in this application may be that the battery 100 is in a fast charging state, or the battery 100 is in a normal charging state, or the battery 100 is in a discharging state (the vehicle where the battery 100 is located is in a driving state).

[0049] The battery thermal management system provided in the present application includes a top and bottom liquid cooling plate 200, a first liquid cooling device 300 and a second liquid cooling device 400. The top and bottom liquid cooling plates 200 are provided with liquid cooling channels, which include a first channel opening and a second channel opening. The top and bottom liquid cooling plates 200 perform heat exchange with the battery 100. One end of the first liquid cooling device 300 is connected to the first channel opening, and the other end of the first liquid cooling device 300 is connected to the second channel opening. One end of the second liquid cooling device 400 is connected to the first channel opening, and the other end of the second liquid cooling device 400 is connected to the second channel opening. The first liquid cooling device 300 is configured to liquid-cool at least the battery 100 in a non-supercharged state, and the second liquid cooling device 400 is configured to liquid-cool at least the battery 100 in a supercharged state. This can avoid excessive temperature and excessive temperature difference during charging of the battery 100, and in particular, ensure that the temperature of the battery 100 is within a safe range during supercharging, thereby ensuring the reliability of the battery 100.

[0050] In some embodiments, as Figure 1 As shown, the battery thermal management system also includes a first three-way valve T1 and a second three-way valve T2; wherein, the first end 1 of the first three-way valve T1 is connected to the first flow channel, the second end 2 of the first three-way valve T1 is connected to one end of the first liquid cooling device 300, and the third end 3 of the first three-way valve T1 is connected to one end of the second liquid cooling device 400; the first end 1 of the second three-way valve T2 is connected to the other end of the first liquid cooling device 300, the second end 2 of the second three-way valve T2 is connected to the second flow channel, and the third end 3 of the second three-way valve T2 is connected to the other end of the second liquid cooling device 400.

[0051] In this embodiment, the first three-way valve T1 and the second three-way valve T2 can isolate the first liquid cooling device 300 and the second liquid cooling device 400 by water path, so that when the battery 100 is in a non-supercharged state, the first liquid cooling device 300 can independently cool the battery 100, and when the battery 100 is in a supercharged state, the second liquid cooling device 400 can independently cool the battery 100.

[0052] Specifically, when the battery 100 is not in a supercharged state, the first end 1 and the third end 3 of the first three-way valve T1 are connected, while the first end 1 and the second end 2 of the first three-way valve T1 are not connected. The first end 1 and the second end 2 of the second three-way valve T2 are connected, while the second end 2 and the third end 3 of the second three-way valve T2 are not connected. Thus, the first liquid cooling device 300 can be used to liquid-cool the battery 100 alone. When the battery 100 is in a supercharged state, the first end 1 and the third end 3 of the first three-way valve T1 are not connected, while the first end 1 and the second end 2 of the first three-way valve T1 are connected. The first end 1 and the second end 2 of the second three-way valve T2 are not connected, while the second end 2 and the third end 3 of the second three-way valve T2 are connected. Thus, the first liquid cooling device 300 can be used to liquid-cool the battery 100 alone. Both the first three-way valve T1 and the second three-way valve T2 can be controlled by the battery pack's battery management system.

[0053] In some embodiments, as Figure 1 As shown, the battery thermal management system also includes a liquid cooling socket 500; wherein, the first end of the liquid cooling socket 500 is connected to the third end 3 of the first three-way valve T1, the second end of the liquid cooling socket 500 is connected to the third end 3 of the second three-way valve T2, the third end of the liquid cooling socket 500 is connected to one end of the second liquid cooling device 400, and the fourth end of the liquid cooling socket 500 is connected to the other end of the second liquid cooling device 400; the first end and the third end of the liquid cooling socket 500 are connected, and the second end and the fourth end of the liquid cooling socket 500 are connected.

[0054] In this embodiment, the liquid cooling socket 500 can be installed inside the vehicle body. When the battery 100 needs to be supercharged, it can be connected to the second liquid cooling device 400 through the liquid cooling socket 500. The second liquid cooling device 400 can then liquid-cool the supercharged battery 100, thereby ensuring that the temperature and temperature difference of the battery 100 in the supercharged state are within a safe range.

[0055] The Liquid-Cooled Socket 500 is a charging socket that uses liquid cooling technology and is primarily used in electric vehicle charging systems. The Liquid-Cooled Socket 500 uses coolant to lower the temperature during the charging process, thereby improving charging efficiency and safety. The advantage of the Liquid-Cooled Socket 500 is that it can effectively lower the temperature during the charging process, thereby reducing the cable cross-sectional area requirements, reducing the weight of the plug and cable, and improving operational convenience. Furthermore, the Liquid-Cooled Socket 500 can also help charging piles achieve a higher charging power. For example, during high-power charging, the Liquid-Cooled Socket 500 can achieve a stable charging power of 500kW, or even 700kW in a short period of time.

[0056] In some embodiments, as Figure 1 As shown, the top and bottom liquid cooling plates 200 include a first liquid cooling plate 201 and a second liquid cooling plate 202, and the liquid cooling channel includes a first liquid cooling channel and a second liquid cooling channel; wherein, the first liquid cooling channel is arranged in the first liquid cooling plate 201, and the second liquid cooling channel is arranged in the second liquid cooling plate 202; one end of the first liquid cooling channel and one end of the second liquid cooling channel are connected to the first channel opening using a first three-way joint T5, and the other end of the first liquid cooling channel and the other end of the second liquid cooling channel are connected to the second channel opening using a second three-way joint T6.

[0057] In this embodiment, the first liquid cooling plate 201 and the second liquid cooling plate 202 can be located on corresponding sides of the battery 100. Specifically, the first liquid cooling plate 201 can be located at the top of the battery 100, and the second liquid cooling plate 202 can be located at the bottom of the battery 100, so that the battery 100 can be cooled using a top-bottom liquid cooling method. At the same time, to ensure that the battery 100 can achieve top-bottom liquid cooling, one end of the first liquid cooling channel and one end of the second liquid cooling channel are connected to the first channel opening using a first three-way joint T5, and the other end of the first liquid cooling channel and the other end of the second liquid cooling channel are connected to the second channel opening using a second three-way joint T6.

[0058] Specifically, the first end 1 of the first three-way joint T5 is connected to one end of the first liquid-cooling channel, the second end 2 of the first three-way joint T5 is connected to one end of the second liquid-cooling channel, and the third end 3 of the first three-way joint T5 is connected to the first channel outlet; the first end 1 of the second three-way joint T6 is connected to the other end of the first liquid-cooling channel, the second end 2 of the second three-way joint T6 is connected to the other end of the second liquid-cooling channel, and the third end 3 of the second three-way joint T6 is connected to the second liquid-cooling channel outlet.

[0059] In some embodiments, the liquid cooling flow rate of the first liquid cooling channel is smaller than the liquid cooling flow rate of the second liquid cooling channel.

[0060] In this embodiment, the first liquid cooling plate 201 is arranged at the top of the battery 100, and the second liquid cooling plate 202 is arranged at the bottom of the battery 100, which can achieve a better liquid cooling effect for the battery pack. However, this method may result in a better cooling effect at the top of the battery 100 and a poor cooling effect at the bottom of the battery 100, resulting in a large temperature difference between the top and the bottom.

[0061] For example, if the first liquid cooling plate 201 is a stamped liquid cooling plate and the second liquid cooling plate 202 is an extruded liquid cooling plate, the stamped liquid cooling plate has a better cooling effect than the extruded liquid cooling plate, which will lead to a better cooling effect on the top of the battery 100 and a poor cooling effect on the bottom of the battery 100, resulting in a large temperature difference between the top and the bottom.

[0062] To this end, the present application requires that the liquid cooling flow rate of the first liquid cooling channel be set to be smaller than the liquid cooling flow rate of the second liquid cooling channel. Specifically, the liquid cooling flow rate ratio between the first liquid cooling channel and the second liquid cooling channel can be 3:7.

[0063] Furthermore, in the process of realizing that the liquid cooling flow rate of the first liquid cooling channel is smaller than the liquid cooling flow rate of the second liquid cooling channel, the inner diameter of the first end 1 of the first three-way joint T5 can be set to be smaller than the inner diameter of the second end 2 of the first three-way joint T5, and at the same time, the inner diameter of the first end 1 of the second three-way joint T6 can be set to be smaller than the inner diameter of the second end 2 of the second three-way joint T6.

[0064] It should be noted that the liquid cooling flow rate of the first liquid cooling channel can be set to be smaller than the liquid cooling flow rate of the second liquid cooling channel according to actual application, and this application does not make specific restrictions. For example, the first three-way connector T5 and the second three-way interface can be replaced with three-way valves to achieve this.

[0065] In some embodiments, the first liquid cooling plate 201 comprises a stamped liquid cooling plate, and the second liquid cooling plate 202 comprises an extruded liquid cooling plate.

[0066] Specifically, the liquid cooling plate usually configured for the battery pack is a stamped liquid cooling plate. Since this application adopts a top-bottom liquid cooling method, and the bottom of the battery 100 placed by the stamped liquid cooling plate cannot bear force, it is necessary to configure the liquid cooling plate at the bottom of the battery 100 as an extruded liquid cooling plate.

[0067] Stamped liquid cold plates are manufactured using a stamping process and are typically used to create simple shapes. They offer advantages such as flexible flow channel design, large contact area, excellent heat exchange, high production efficiency, and superior pressure resistance and strength. During the manufacturing process, stamped liquid cold plates undergo a degreasing process to remove surface oil and impurities to ensure optimal performance during use.

[0068] Extruded liquid cold plates are a product that combines extrusion technology with liquid cooling technology, primarily used in applications requiring efficient heat dissipation and heat preservation. Combining the thermal insulation performance of extruded plates with the heat dissipation performance of liquid cold plates, they are ideal for applications requiring both high efficiency and heat preservation.

[0069] In some embodiments, the battery thermal management system further includes an exhaust assembly; wherein one end of the exhaust assembly is respectively connected to the first flow channel opening and one end of the first liquid cooling device 300, and the other end of the exhaust assembly is connected to the outside world.

[0070] Specifically, the present application may also include an exhaust assembly at the first flow channel outlet to facilitate exhaust of air within the duct, thereby further enhancing the cooling effect of the top-bottom liquid cooling system. Since the cooling power of the second liquid cooling device 400 is much greater than that of the first liquid cooling device 300, the exhaust assembly can be installed inside the vehicle and used in conjunction with the first liquid cooling device 300, further enhancing the cooling effect of the first liquid cooling device 300.

[0071] Furthermore, in some embodiments, Figure 1 As shown, the exhaust assembly includes an exhaust pipe and a third three-way valve T3; wherein, the first end 1 of the third three-way valve T3 is connected to the first flow channel outlet, the second end 2 of the third three-way valve T3 is connected to one end of the first liquid cooling device 300, the third end 3 of the third three-way valve T3 is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the outside world.

[0072] In this embodiment, by arranging the third three-way valve T3 at the first flow channel outlet and one end of the first liquid cooling device 300, the first end 1 and the third end 3 of the third three-way valve T3 can be connected when the pipeline needs to be exhausted, and when the pipeline does not need to be exhausted, the first end 1 and the second end 2 of the third three-way valve T3 are connected and the first end 1 and the third end 3 of the third three-way valve T3 are not connected.

[0073] Furthermore, in some embodiments, Figure 1As shown, the exhaust assembly includes a liquid injection pot 600 and a fourth three-way valve T4; wherein, the liquid injection pot 600 is connected to the first end 1 of the fourth three-way valve T4, the second end 2 of the fourth three-way valve T4 is connected to the second end 2 of the third three-way valve T3, the third end 3 of the fourth three-way valve T4 is connected to one end of the first liquid cooling device 300, and the other end of the exhaust pipe is connected to the outside world through the liquid injection pot 600.

[0074] Specifically, the present application can also set a fourth three-way valve T4 between the third three-way valve T3 and the first liquid cooling device 300, and set a liquid injection pot 600 between the third three-way valve T3 and the fourth three-way valve T4, which can not only avoid the reduction of coolant in the pipeline during the exhaust process, but also facilitate the replenishment of liquid in the pipeline.

[0075] In this embodiment, when only exhaust is required within the pipeline, only the first end 1 and the third end 3 of the third three-way pipe can be connected. When the first liquid cooling device 300 is required to liquid-cool the battery 100 and exhaust is required within the pipeline, the first end 1 and the third end 3 of the third three-way pipe can be connected, and the first end 1 and the second end 2 of the fourth three-way pipe can be connected. The first end 1 and the second end 2 of the third three-way pipe may or may not be connected; the second end 2 of the fourth connecting pipe may or may not be connected.

[0076] It should be noted that the third three-way valve T3 and the fourth three-way valve T4 can also be configured as three-way joints, which can also achieve the purpose of the first liquid cooling device 300 cooling the battery 100 and exhausting the pipes.

[0077] In addition, when the pipeline only needs to be exhausted, only the first end 1 and the third end 3 of the third three-way pipe can be connected.

[0078] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery thermal management system, characterized in that: include: The top and bottom liquid cooling plates are provided with liquid cooling channels, the liquid cooling channels including a first channel opening and a second channel opening, and the top and bottom liquid cooling plates perform heat exchange with the battery; a first liquid cooling device, wherein one end of the first liquid cooling device is connected to the first flow channel opening, and the other end of the first liquid cooling device is connected to the second flow channel opening; a second liquid cooling device, one end of the second liquid cooling device being connected to the first flow channel opening, and the other end of the second liquid cooling device being connected to the second flow channel opening; The first liquid cooling device is configured to at least perform liquid cooling on the battery in a non-supercharged state, and the second liquid cooling device is configured to at least perform liquid cooling on the battery in a supercharged state.

2. The battery thermal management system according to claim 1, characterized in that: The battery thermal management system further includes a first three-way valve and a second three-way valve; The first end of the first three-way valve is connected to the first flow channel, the second end of the first three-way valve is connected to one end of the first liquid cooling device, and the third end of the first three-way valve is connected to one end of the second liquid cooling device. The first end of the second three-way valve is connected to the other end of the first liquid cooling device, the second end of the second three-way valve is connected to the second flow channel port, and the third end of the second three-way valve is connected to the other end of the second liquid cooling device.

3. The battery thermal management system according to claim 2, characterized in that: The battery thermal management system also includes a liquid cooling socket; The first end of the liquid cooling socket is connected to the third end of the first three-way valve, the second end of the liquid cooling socket is connected to the third end of the second three-way valve, the third end of the liquid cooling socket is connected to one end of the second liquid cooling device, and the fourth end of the liquid cooling socket is connected to the other end of the second liquid cooling device. The first end and the third end of the liquid cooling socket are in communication, and the second end and the fourth end of the liquid cooling socket are in communication.

4. The battery thermal management system according to claim 1, characterized in that: The top and bottom liquid cooling plates include a first liquid cooling plate and a second liquid cooling plate, and the liquid cooling channel includes a first liquid cooling channel and a second liquid cooling channel; Wherein, the first liquid cooling channel is provided in the first liquid cooling plate, and the second liquid cooling channel is provided in the second liquid cooling plate; One end of the first liquid-cooling channel and one end of the second liquid-cooling channel are connected to the first channel opening using a first three-way joint, and the other end of the first liquid-cooling channel and the other end of the second liquid-cooling channel are connected to the second channel opening using a second three-way joint.

5. The battery thermal management system according to claim 4, characterized in that: The first liquid cooling plate and the second liquid cooling plate are respectively located on two corresponding sides of the battery.

6. The battery thermal management system according to claim 4, characterized in that: The liquid cooling flow rate of the first liquid cooling channel is smaller than the liquid cooling flow rate of the second liquid cooling channel; or / and, The first liquid cooling plate includes a stamped liquid cooling plate, and the second liquid cooling plate includes an extruded liquid cooling plate.

7. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The first liquid cooling device is provided at the vehicle end, and the second liquid cooling device is provided at the non-vehicle end. The liquid cooling power of the first liquid cooling device is smaller than the liquid cooling power of the second liquid cooling device.

8. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The battery thermal management system further includes an exhaust assembly; One end of the exhaust component is connected to the first flow channel and one end of the first liquid cooling device respectively, and the other end of the exhaust component is connected to the outside.

9. The battery thermal management system according to claim 8, characterized in that: The exhaust assembly includes an exhaust pipe and a third three-way valve; Among them, the first end of the third three-way valve is connected to the first flow channel, the second end of the third three-way valve is connected to one end of the first liquid cooling device, the third end of the third three-way valve is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the outside world.

10. The battery thermal management system according to claim 9, characterized in that: The exhaust assembly includes a liquid injection pot and a fourth three-way valve; Among them, the liquid injection pot is connected to the first end of the fourth three-way valve, the second end of the fourth three-way valve is connected to the second end of the third three-way valve, the third end of the fourth three-way valve is connected to one end of the first liquid cooling device, and the other end of the exhaust pipe is connected to the outside world through the liquid injection pot.

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