A wide-temperature range battery thermal management system using phase change material coupled with immersion cooling

Abstract

The present invention belongs to the field of battery thermal management technology, and in particular relates to a wide-temperature range battery thermal management system coupled with immersion cooling of a phase change material, comprising at least one battery, and further comprising: a composite flexible phase change material, arranged on the outside of the battery, the composite flexible phase change material and the battery side wall being heat exchanged; a dielectric fluid flow channel, arranged between the composite flexible phase change material and the battery side wall, the dielectric fluid flow channel being used for dielectric fluid flow, the dielectric fluid and the composite flexible phase change material and the battery being heat exchanged; a heat pump heat exchange system, the liquid inlet end of the heat pump heat exchange system being connected to the liquid outlet end of the dielectric fluid flow channel, the liquid outlet end of the heat pump heat exchange system being connected to the liquid inlet end of the dielectric fluid flow channel, the heat pump heat exchange system being used for cooling or heating the dielectric fluid. By combining flexible phase change material with immersion heat exchange, the present invention has thermal balancing capability, can effectively control the battery temperature within the optimal performance range, and helps to improve the performance of the battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery thermal management, and in particular relates to a wide-temperature range battery thermal management system using phase change materials coupled with immersion cooling. Background Art

[0002] Batteries generate significant heat during charging and discharging. Due to the small spacing between battery modules, this heat is difficult to dissipate quickly, leading to heat accumulation and significant operating temperature differences between battery packs. Over time, this can lead to significant inconsistencies in internal resistance and capacity between cells, severely impacting the performance and lifespan of the battery pack and posing a potential safety hazard.

[0003] Excessively high battery temperatures can lead to reduced battery life and decreased charging safety. However, when the battery charge is too low, metallic lithium in the battery can deposit, causing internal short circuits. Excessively low temperatures can lead to reduced battery performance, shortened lifespan, and even safety risks. Therefore, appropriate battery thermal management methods must be selected based on actual usage.

[0004] Using phase-change materials (PCMs) to cool batteries has attracted considerable attention due to their simple structure and low energy consumption. However, due to the low thermal conductivity of PCMs and the limited mass of the battery container that can accommodate them, relying solely on PCMs is unable to dissipate heat in a timely manner during high-rate discharge or long-term cycle charge-discharge conditions. Therefore, we propose a wide-temperature battery thermal management system that combines PCMs with immersion cooling to address this issue. Summary of the Invention

[0005] The object of the present invention is to provide a wide temperature range battery thermal management system with phase change material coupled immersion cooling to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A wide-temperature-range battery thermal management system using a phase change material coupled with immersion cooling, comprising at least one battery and:

[0008] A composite flexible phase change material is disposed on the outside of the battery, and the composite flexible phase change material is arranged for heat exchange with the side wall of the battery;

[0009] A dielectric fluid flow channel is provided between the composite flexible phase change material and the side wall of the battery, the dielectric fluid flow channel is used for the flow of dielectric fluid, and the dielectric fluid is heat exchanged with the composite flexible phase change material and the battery;

[0010] A heat pump heat exchange system, wherein the liquid inlet end of the heat pump heat exchange system is connected to the liquid outlet end of the dielectric fluid flow channel, and the liquid outlet end of the heat pump heat exchange system is connected to the liquid inlet end of the dielectric fluid flow channel, and the heat pump heat exchange system is used to cool or heat the dielectric fluid.

[0011] Optionally, the composite flexible phase change material is made of the composite flexible phase change material, and the composite flexible phase change material is made by mixing a polymer, a cross-linked structure, a carbon-based porous material, a phase change fiber and an aerogel.

[0012] Optionally, the dielectric fluid flow channel is a channel surrounded by the composite flexible phase change material and the battery side wall.

[0013] Optionally, the battery is fixedly connected to a top cover, and the bottom of the battery is fixedly connected to a base;

[0014] Pipes for the flow of the dielectric fluid are provided inside the top cover and the base, the liquid inlet of the internal pipe of the top cover is connected to the liquid outlet of the dielectric fluid flow channel, and the liquid outlet of the internal pipe is connected to the liquid inlet of the heat pump heat exchange system;

[0015] The liquid inlet end of the internal pipeline of the base is communicated with the liquid outlet end of the heat pump heat exchange system, and the liquid outlet end of the internal pipeline of the base is communicated with the liquid inlet end of the dielectric fluid flow channel.

[0016] Optionally, the liquid outlet of the top cover is connected to the liquid inlet of the dielectric fluid storage chamber, and the liquid outlet of the dielectric fluid storage chamber is connected to the liquid inlet of the heat pump heat exchange system.

[0017] Optionally, the liquid inlet end of the base is connected to the liquid outlet end of a liquid pump, and the liquid inlet end of the liquid pump is connected to the liquid outlet end of the heat pump heat exchange system.

[0018] Optionally, the liquid pump is electrically connected to a temperature detection controller, and the temperature detection controller is used to detect the temperature of the dielectric fluid and the battery and adjust the pumping speed of the liquid pump.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] During use, the battery generates heat in the early stage, and the latent heat of the flexible phase change material is used to absorb the battery heat and store it. According to different usage environments, this system is divided into cooling mode and heating mode. In the cooling mode, the flexible phase change material is used to absorb the battery heat in the early stage. When the battery temperature is higher than the phase change temperature of the flexible phase change material, the dielectric fluid circulates in the dielectric fluid flow channel. After absorbing the battery heat, the dielectric fluid enters the heat pump heat exchange system for cooling. After the dielectric fluid temperature drops, it returns to the dielectric fluid flow channel to exchange heat with the battery, thereby lowering the battery temperature. In the heating mode, the dielectric fluid circulates in the dielectric fluid flow channel, and the dielectric fluid is heated by the heat pump heat exchange system. The heated dielectric fluid returns to the dielectric fluid flow channel to exchange heat with the battery, thereby raising the battery temperature. The present invention combines flexible phase change materials with immersion liquid cooling to achieve thermal balancing capabilities. A heat pump heat exchange system can be used to control the battery temperature, selectively heating or cooling the battery according to the ambient temperature and battery operating conditions. Furthermore, by utilizing the latent heat properties of the flexible phase change material, the dielectric fluid begins to cool the battery only after the phase change temperature is exceeded. Cooling the battery through the heat pump heat exchange system can achieve energy-saving effects. The coupling of the latent heat properties of the flexible phase change material and the heat pump heat exchange system can effectively control the battery temperature within the optimal performance range, thereby helping to improve battery performance and extend battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 Schematic diagram of the positional relationship among the battery, flexible phase change material and dielectric fluid flow channel of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the flexible phase change material and dielectric fluid flow channel of the present invention;

[0025] Figure 4 For the present invention Figure 2 Schematic diagram of the AA section structure;

[0026] Figure 5 This is a temperature control flow chart of the battery module of the present invention;

[0027] Among them, 1. Battery; 2. Composite flexible phase change material; 3. Dielectric fluid flow channel; 4. Top cover; 5. Liquid pump; 6. Temperature detection controller; 7. Dielectric fluid storage chamber; 8. First heat exchanger; 9. Throttling device; 10. Four-way valve; 11. Compressor; 12. Second heat exchanger; 13. Heat pump heat exchange system; 14. Base. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figures 1 to 5 The present invention discloses a wide temperature range battery thermal management system using a phase change material coupled with immersion cooling, comprising at least one battery 1, and further comprising:

[0031] The composite flexible phase change material 2 is arranged on the outside of the battery 1, and the composite flexible phase change material 2 is arranged to exchange heat with the side wall of the battery 1;

[0032] The dielectric fluid flow channel 3 is provided between the composite flexible phase change material 2 and the side wall of the battery 1. The dielectric fluid flow channel 3 is used for the flow of dielectric fluid. The dielectric fluid is provided for heat exchange with the composite flexible phase change material 2 and the battery 1.

[0033] The heat pump heat exchange system 13 has a liquid inlet connected to a liquid outlet of the dielectric fluid flow channel 3, and a liquid outlet connected to a liquid inlet of the dielectric fluid flow channel 3. The heat pump heat exchange system 13 is used for cooling or heating the dielectric fluid.

[0034] During use, the battery 1 generates heat in the early stage, and the latent heat of the composite flexible phase change material 2 is used to absorb the heat of the battery 1 and store it. According to different usage environments, this system is divided into a cooling mode and a heating mode. When in the cooling mode, the composite flexible phase change material 2 is used to absorb the heat of the battery 1 in the early stage. When the temperature of the battery 1 is higher than the phase change temperature of the composite flexible phase change material 2, the dielectric fluid circulates in the dielectric fluid flow channel 3. After the dielectric fluid absorbs the heat of the battery 1, it enters the heat pump heat exchange system 13 for cooling. After the temperature of the dielectric fluid drops, it flows back to the dielectric fluid flow channel 3 for heat exchange with the battery 1, so that the temperature of the battery 1 drops. When in the heating mode, the dielectric fluid circulates in the dielectric fluid flow channel 3, and the dielectric fluid is heated by the heat pump heat exchange system 13. The heated dielectric fluid returns to the dielectric fluid flow channel 3 for heat exchange with the battery 1, so that the temperature of the battery 1 increases. The present invention combines the composite flexible phase change material 2 with immersion liquid cooling to achieve thermal balancing capabilities. The heat pump heat exchange system 13 can be used to control the temperature of the battery 1, and the battery 1 can be selectively heated or cooled according to the ambient temperature and the battery operating conditions. In addition, the latent heat performance of the composite flexible phase change material 2 is utilized to allow the dielectric fluid to cool the battery 1 only after the phase change temperature is exceeded. Cooling the battery 1 through the heat pump heat exchange system 13 can achieve energy-saving effects. The coupling of the latent heat performance of the composite flexible phase change material 2 and the heat pump heat exchange system 13 can effectively control the temperature of the battery 1 within the optimal performance range, thereby helping to improve the performance of the battery and extend the battery life.

[0035] Furthermore, the battery 1 is a square battery and is provided in plurality. The plurality of batteries 1 are separated from each other. The composite flexible phase change material 2 is sandwiched between two batteries 1 and is in full contact with the side wall of the battery 1, which has the functions of heat preservation, temperature control and support for the battery 1.

[0036] Furthermore, the dielectric fluid is preferably an insulating and flame-retardant FC-3283 / FC-40 fluorinated fluid, which can provide a wider operating temperature range while maintaining low viscosity and high heat transfer.

[0037] As an optional embodiment, the composite flexible phase change material 2 is made by mixing a polymer, a cross-linked structure, a carbon-based porous material, a phase change fiber and an aerogel.

[0038] Furthermore, the composite flexible phase change material 2 serves as a flexible skeleton for supporting and separating the plurality of square batteries 1. The composite flexible phase change material 2 is made of a phase change matrix and a supporting material.

[0039] The support material includes an internal molecular support and an external skeleton.

[0040] The internal molecular support includes polymers and cross-linking structures. The polymer is made from one or more of thermoplastic elastomers, polyurethanes, polydimethylsiloxanes, olefin block copolymers, and ethylene propylene diene mixtures, and has good physical properties and chemical stability. The cross-linking structure is made from one or more of cellulose 2-bromopropionate, polyether soft segment copolyester thermoplastic elastomers, polyolefin elastomer / styrene-b-ethylene-co-butylene-b-styrene triblock copolymers, and DC-PCM, a new type of dynamically cross-linked solid-solid flexible phase change material.

[0041] The outer skeleton comprises a carbon-based porous material, phase-change fibers, and aerogel. The carbon-based porous material includes one or more of SWCNT thin films, single-walled carbon nanotubes, sodium stearate, carbonized foam, and melamine foam. The phase-change fibers are one or more of polypropylene, polyurethane fibers, polyvinylidene fluoride, and serine protein. The aerogel is either silica aerogel or graphene aerogel.

[0042] Furthermore, the composite flexible phase change material 2 is made of the following raw materials in parts by mass: 8 parts of paraffin wax (PA), 2 parts of olefin block copolymer (OBC), and 5 parts of expanded graphite (EG);

[0043] Or 7 parts paraffin (PA), 3 parts thermoplastic polyester elastomer (TPEE), 5 parts expanded graphite (EG).

[0044] As an optional embodiment, the dielectric fluid flow channel 3 is a channel surrounded by the composite flexible phase change material 2 and the side wall of the battery 1.

[0045] The dielectric fluid flow channel 3 is a channel formed by the housing and the side wall of the battery 1. Multiple dielectric fluid flow channels 3 are provided on the side of the battery 1. The dielectric fluid flow channel 3 structure is parallel to the height direction of the battery 1 and extends through the composite flexible phase change material 2. The dielectric fluid flow channel 3 allows the dielectric fluid to flow and allows the dielectric fluid to contact the battery 1.

[0046] As an optional embodiment, the battery 1 is fixedly connected to a top cover 4, and the bottom of the battery 1 is fixedly connected to a base 14;

[0047] The top cover 4 and the base 14 are both provided with pipelines for the flow of dielectric fluid. The liquid inlet of the pipeline inside the top cover 4 is connected to the liquid outlet of the dielectric fluid flow channel 3, and the liquid outlet of the internal pipeline is connected to the liquid inlet of the heat pump heat exchange system 13.

[0048] The liquid inlet of the internal pipeline of the base 14 is communicated with the liquid outlet of the heat pump heat exchange system 13 , and the liquid outlet of the internal pipeline of the base 14 is communicated with the liquid inlet of the dielectric fluid flow channel 3 .

[0049] A top cover 4 and a base 14 are provided, and the battery 1 and the composite flexible phase change material 2 are provided between the top cover 4 and the base 14 and fixed by the top cover 4 and the base 14. The pipes inside the top cover 4 and the base 14 are connected to the corresponding ends of the multiple dielectric fluid flow channels 3. In this way, the dielectric fluid can flow into or out of the battery module composed of multiple batteries 1 and multiple composite flexible phase change materials 2 through the dielectric fluid flow channels 3; the top cover 4 and the base 14 are respectively provided with a liquid outlet and a liquid inlet for the dielectric fluid. In this way, the dielectric fluid can flow out of or into the heat pump heat exchange system 13 through the liquid outlet and the liquid inlet.

[0050] As an optional embodiment, the liquid outlet of the top cover 4 is connected to the liquid inlet of the dielectric fluid storage chamber 7 , and the liquid outlet of the dielectric fluid storage chamber 7 is connected to the liquid inlet of the heat pump heat exchange system 13 .

[0051] The dielectric fluid storage chamber 7 is used to store dielectric fluid.

[0052] As an optional embodiment, the liquid inlet end of the base 14 is connected to the liquid outlet end of the liquid pump 5 , and the liquid inlet end of the liquid pump 5 is connected to the liquid outlet end of the heat pump heat exchange system 13 .

[0053] The liquid pump 5 is used to pump the dielectric fluid and cooperates with the dielectric fluid storage chamber 7 to adjust the flow rate of the dielectric fluid.

[0054] As an optional embodiment, the liquid pump 5 is electrically connected to a temperature detection controller 6 , which is used to detect the temperature of the dielectric fluid and the battery 1 and adjust the pumping speed of the liquid pump 5 .

[0055] The dielectric fluid storage chamber 7 can store dielectric fluid. The liquid pump 5 is connected to the temperature detection controller 6, the heat pump heat exchange system 13, and the dielectric fluid storage chamber 7 to perform liquid pressurization. The temperature detection controller 6 is connected to the liquid pump 5 and the battery module. In this way, the temperature of the battery module can be detected and the liquid pump 5 can be controlled according to different operating conditions. The heat exchange efficiency is controlled by controlling the flow rate.

[0056] The temperature detection controller 6 includes a temperature sensor and a controller. The temperature sensor is connected to the battery module and is used to detect the temperature of the battery 1 and the dielectric fluid in real time. The controller is connected to the liquid pump 5 and is used to control the opening and closing of the liquid pump 5.

[0057] The heat pump heat exchange system 13 includes a first heat exchanger 8, a throttling device 9, a four-way valve 10, a compressor 11, a second heat exchanger 12, and a refrigerant. The refrigerant flows in the pipes of the heat pump heat exchange system 13. The compressor 11 is connected to the four-way valve 10, which can be switched between cooling mode and heating mode. The first heat exchanger 8 is connected to the battery module and the dielectric fluid storage chamber 7, allowing the refrigerant to exchange heat with the dielectric fluid. As a result, the dielectric fluid in the dielectric fluid storage chamber 7 can be selectively heated or cooled. The second heat exchanger 12 allows the refrigerant to exchange heat with the external environment. The throttling device 9 is an expansion valve, which can reduce the refrigerant temperature by throttling and reducing the pressure. The refrigerant flows in the pipes of the heat pump heat exchange system 13. The dielectric fluid flows in each dielectric fluid flow channel 3 and exchanges cold or heat with the refrigerant through the first heat exchanger 8 to regulate the temperature of the battery 1.

[0058] In actual use, the present invention requires a judgment of the environment in which the battery module is located in order to control the temperature of the battery module, that is, the temperature of the environment in which the battery 1 is located is measured. The ambient temperature of the battery module is adjusted by the heat pump heat exchange system 13.

[0059] For example, the temperature of the battery has a significant impact on the battery life and performance, and the most suitable operating temperature range is between 15 and 35 degrees Celsius. In order to protect the operating temperature and performance of the battery, the present invention can control the battery module temperature between 15 and 35 degrees Celsius.

[0060] In the summer, the temperature is high, and the ambient temperature of the battery 1 tends to be high. When the temperature reaches a certain level, the heat pump heat exchange system 13 is selected to operate in cooling mode to cool the battery module. When the temperature sensor in the temperature detection controller 6 detects that the temperature of the battery module is higher than 35°C, the controller controls the liquid pump 5 to drive the FC-3283 fluorinated liquid in the dielectric fluid storage chamber 7 to flow into and out of the battery module through the dielectric fluid flow channel 3. When the fluorinated liquid reaches the first heat exchanger 8, the refrigerant undergoes heat exchange with the fluorinated liquid in the first heat exchanger 8, thereby increasing its temperature. The refrigerant flows into the compressor 11, and the temperature of the refrigerant increases due to the pressure increase. Then, the refrigerant flows into the second heat exchanger 12 and undergoes heat exchange, and the temperature of the refrigerant decreases. After that, the refrigerant flows into the throttling device 9, and after passing through the expansion valve, the temperature decreases due to the pressure drop. Finally, the refrigerant returns to the first heat exchanger 8 again and undergoes heat exchange with the fluorinated liquid, causing the temperature of the fluorinated liquid to decrease. Furthermore, the battery module is immersed in liquid cooling under the circulation of the fluorinated liquid in the dielectric fluid flow channel 3. When the temperature sensor in the temperature detection controller 6 detects that the temperature of the battery module is lower than 35°C, the controller controls the liquid pump 5 to stop operating, so that the fluorinated liquid in the dielectric fluid storage chamber 7 stops flowing into the battery module. As a result, the fluorinated liquid cannot circulate in the dielectric fluid flow channel 3, and the battery module relies on the composite flexible phase change material 2 therein for thermal management.

[0061] In winter, temperatures are low, and the ambient temperature surrounding battery 1 tends to be low. When the temperature reaches a certain level and the phase transition temperature is too high, the heat pump heat exchange system 13 is set to heating mode to heat the battery module. When the temperature sensor in the temperature detection controller 6 detects that the battery module temperature is below 15°C, the controller controls the liquid pump 5 to drive the FC-40 fluorinated liquid in the dielectric fluid storage chamber 7 to flow into and out of the battery module through the dielectric fluid flow channel 3. When the fluorinated liquid reaches the first heat exchanger 8, the refrigerant in the heat pump heat exchange system 13 undergoes heat exchange with the fluorinated liquid in the first heat exchanger, thereby reducing its temperature. After flowing into the throttling device 9, the refrigerant temperature also decreases. Next, it flows into the second heat exchanger 12, where the temperature increases after heat exchange, and flows into the four-way valve 10. At this time, the four-way valve 10 is set to the opposite mode to the cooling mode. Afterwards, the refrigerant flows into the compressor 11, where its temperature further increases due to the pressure increase, and then flows into the four-way valve 10 again. Finally, the refrigerant returns to the first heat exchanger 8 again and exchanges heat with the fluorinated liquid, causing the temperature of the fluorinated liquid to rise. Furthermore, the battery module is immersed in liquid cooling and heating under the circulation of the fluorinated liquid in the dielectric fluid flow channel 3. When the temperature sensor in the temperature detection controller 6 detects that the temperature of the battery module is higher than 15°C, the controller controls the liquid pump to stop operating, so that the fluorinated liquid in the dielectric fluid storage chamber 7 stops flowing into the battery module, and the fluorinated liquid cannot circulate in the dielectric fluid flow channel 3. The battery module relies on the composite flexible phase change material 2 therein for thermal management.

[0062] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying 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.

[0063] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A wide temperature range battery thermal management system with phase change material coupled immersion cooling, comprising at least one battery (1), characterized in that: Also includes: A composite flexible phase change material (2) is arranged on the outside of the battery (1), and the composite flexible phase change material (2) is arranged for heat exchange with the side wall of the battery (1); A dielectric fluid flow channel (3) is provided between the composite flexible phase change material (2) and the side wall of the battery (1), the dielectric fluid flow channel (3) is used for dielectric fluid flow, and the dielectric fluid is heat-exchanged with the composite flexible phase change material (2) and the battery (1); A heat pump heat exchange system (13), wherein the liquid inlet of the heat pump heat exchange system (13) is in communication with the liquid outlet of the dielectric fluid flow channel (3), and the liquid outlet of the heat pump heat exchange system (13) is in communication with the liquid inlet of the dielectric fluid flow channel (3), and the heat pump heat exchange system (13) is used for cooling or heating the dielectric fluid; The heat pump heat exchange system (13) comprises a first heat exchanger (8), a throttling device (9), a four-way valve (10), a compressor (11), a second heat exchanger (12), and a refrigerant, wherein the refrigerant flows in a pipeline of the heat pump heat exchange system (13); the compressor (11) is connected to the four-way valve (10), and the four-way valve (10) can be switched to a cooling mode and a heating mode; the first heat exchanger (8) is connected to the dielectric fluid flow channel (3), and the first heat exchanger (8) allows the refrigerant to exchange heat with the dielectric fluid; the second heat exchanger (12) allows the refrigerant to exchange heat with the external environment; the throttling device (9) is an expansion valve; the refrigerant flows in the pipeline of the heat pump heat exchange system (13); the dielectric fluid flows in the dielectric fluid flow channel (3) and exchanges cold or heat with the refrigerant through the first heat exchanger (8), thereby achieving temperature regulation of the battery (1); The composite flexible phase change material (2) is prepared by mixing a polymer, a cross-linked structure, a carbon-based porous material, a phase change fiber and an aerogel; The composite flexible phase change material (2) is made of the following raw materials in parts by mass: 8 parts of paraffin wax, 2 parts of olefin block copolymer, and 5 parts of expanded graphite; Or 7 parts paraffin wax, 3 parts thermoplastic polyester elastomer, 5 parts expanded graphite; The dielectric fluid flow channel (3) is a channel surrounded by the composite flexible phase change material (2) and the side wall of the battery (1).

2. The wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 1, characterized in that: The battery (1) is fixedly connected to a top cover (4), and the bottom of the battery (1) is fixedly connected to a base (14); Pipelines for the flow of the dielectric fluid are provided inside the top cover (4) and the base (14), the liquid inlet end of the internal pipeline of the top cover (4) is connected to the liquid outlet end of the dielectric fluid flow channel (3), and the liquid outlet end of the internal pipeline is connected to the liquid inlet end of the heat pump heat exchange system (13); The liquid inlet end of the internal pipeline of the base (14) is connected to the liquid outlet end of the heat pump heat exchange system (13), and the liquid outlet end of the internal pipeline of the base (14) is connected to the liquid inlet end of the dielectric fluid flow channel (3).

3. The wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 2, characterized in that: The liquid outlet end of the top cover (4) is connected to the liquid inlet end of the dielectric fluid storage chamber (7), and the liquid outlet end of the dielectric fluid storage chamber (7) is connected to the liquid inlet end of the heat pump heat exchange system (13).

4. The wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 2, characterized in that: The liquid inlet end of the base (14) is connected to the liquid outlet end of the liquid pump (5), and the liquid inlet end of the liquid pump (5) is connected to the liquid outlet end of the heat pump heat exchange system (13).

5. The wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 4, characterized in that: The liquid pump (5) is electrically connected to a temperature detection controller (6), and the temperature detection controller (6) is used to detect the temperature of the dielectric fluid and the battery (1) and adjust the pumping speed of the liquid pump (5).

Images