Wide-temperature-range battery thermal management system with phase change material coupled with immersed cooling

Abstract

The invention belongs to the technical field of battery thermal management, and particularly relates to a phase change material coupled immersion cooling wide temperature range battery thermal management system, which comprises at least one battery, and further comprises a composite flexible phase change material arranged on the outer side of the battery, and the composite flexible phase change material exchanges heat with the side wall of the battery; the dielectric fluid flowing channel is arranged between the composite flexible phase change material and the side wall of the battery, the dielectric fluid flowing channel is used for dielectric fluid flowing, and the dielectric fluid exchanges heat with the composite flexible phase change material and the battery; and the liquid inlet end of the heat pump heat exchange system communicates with the liquid outlet end of the dielectric fluid flowing channel, the liquid outlet end of the heat pump heat exchange system communicates with the liquid inlet end of the dielectric fluid flowing channel, and the heat pump heat exchange system is used for cooling or heating the dielectric fluid. According to the invention, the flexible phase change material is combined with immersed heat exchange, so that the heat balance capability is realized, the temperature of the battery can be effectively controlled in an optimal performance interval, and the performance of the battery is favorably improved.

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 with phase change material coupled immersion cooling. Background Art

[0002] During charging and discharging, the battery generates a lot of heat. Due to the small gap between the battery modules, the heat generated by the battery is difficult to be quickly discharged, resulting in heat accumulation and large operating temperature differences between battery packs. If things go on like this for a long time, it will cause serious inconsistencies in internal resistance and capacity between batteries, seriously affecting the performance and life of the battery pack, and thus causing safety hazards.

[0003] If the battery temperature is too high, it will lead to problems such as reduced battery life and reduced charging safety. However, when the battery power is too low, the metal lithium in the battery will be deposited, causing an internal short circuit in the battery. Too low a temperature may cause reduced battery performance, shortened life, and even safety risks. Therefore, it is necessary to choose the appropriate usage method to manage the battery thermally according to the actual situation.

[0004] The use of phase change materials to cool batteries has attracted the attention of many scholars due to its advantages such as simple structure and low energy consumption. However, due to the low thermal conductivity of phase change materials and the limited mass of the battery box that can accommodate phase change materials, it is impossible to dissipate heat in time under high-rate discharge or long-term cycle charge and discharge conditions by relying on a single phase change material. Therefore, we propose a wide-temperature range battery thermal management system that combines phase change materials with immersion cooling to solve this problem. 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 with phase change material coupled immersion cooling, comprising at least one battery, and further comprising:

[0008] A composite flexible phase change material is arranged 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 battery side wall, the dielectric fluid flow channel is used for dielectric fluid flow, 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 for cooling or heating 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] The top cover and the base are both provided with pipelines for the flow of the dielectric fluid, the liquid inlet end of the internal pipeline of the top cover is connected with the liquid outlet end of the dielectric fluid flow channel, and the liquid outlet end of the internal pipeline is connected with the liquid inlet end 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 cavity, and the liquid outlet of the dielectric fluid storage cavity 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] When in use, the heat generated by the battery is initially generated, and the latent heat of the flexible phase change material is used to absorb the battery heat and preserve it. According to different usage environments, the system is divided into cooling mode and heating mode. In the cooling mode, the flexible phase change material is initially used to absorb the battery heat. 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, and the dielectric fluid absorbs the battery heat and enters the heat pump heat exchange system for cooling. After the dielectric fluid temperature drops, it flows back 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 a flexible phase change material with immersion liquid cooling to have a heat balancing capability. The heat pump heat exchange system can be used to control the temperature of the battery, and the battery can be selectively heated or cooled according to the ambient temperature and the battery operating conditions. In addition, the latent heat performance of the flexible phase change material is used to allow the dielectric fluid to cool the battery only after the phase change temperature is exceeded. The heat pump heat exchange system is used to cool the battery, which can achieve an energy-saving effect. The coupling of the latent heat performance of the flexible phase change material and the heat pump heat exchange system can effectively control the battery temperature within the optimal performance range, which helps to improve the performance of the battery and extend the 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 drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

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

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

[0024] Figure 3 It is a schematic diagram of the structure of the flexible phase change material and the 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 of phase change material coupled 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 for heat exchange with the side wall of the battery 1;

[0032] The dielectric fluid flow channel 3 is arranged 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 the dielectric fluid. The dielectric fluid is arranged for heat exchange with the composite flexible phase change material 2 and the battery 1.

[0033] The heat pump heat exchange system 13, the liquid inlet end of the heat pump heat exchange system 13 is connected to the liquid outlet end of the dielectric fluid flow channel 3, and the liquid outlet end of the heat pump heat exchange system 13 is connected to the liquid inlet end 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 heat generated by the battery 1 is initially generated, and the latent heat of the composite flexible phase change material 2 is used to absorb and store the heat of the battery 1. According to different use environments, the system is divided into a cooling mode and a heating mode. In the cooling mode, the composite flexible phase change material 2 is initially used to absorb the heat of the battery 1. 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, and the dielectric fluid absorbs the heat of the battery 1 and enters the heat pump heat exchange system 13 for cooling. After the temperature of the dielectric fluid is reduced, 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 is reduced. 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 is increased. The present invention combines the composite flexible phase change material 2 with immersion liquid cooling to have thermal balancing capability. 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. The heat pump heat exchange system 13 is used to cool the battery 1, which 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, which helps to improve the performance of the battery and extend the service life of the battery.

[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 , and 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 and maintain low viscosity and high heat transfer.

[0037] As an optional implementation, 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 is used as a flexible skeleton to support and separate a 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 framework.

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

[0041] The external skeleton includes carbon-based porous materials, phase change fibers and aerogels. The carbon-based porous materials include one or more of SWCNT thin film 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; and the aerogel is silica aerogel or graphene aerogel.

[0042] Further, 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 implementation, 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 surrounded by the shell and the side wall of the battery 1. A plurality of dielectric fluid flow channels 3 are arranged 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 penetrates 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 end of the pipeline inside 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.

[0048] The liquid inlet end of the internal pipeline of the base 14 is communicated with 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 communicated with the liquid inlet end 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 are fixed by the top cover 4 and the base 14. The pipelines inside the top cover 4 and the base 14 are connected to the corresponding ends of the plurality of dielectric fluid flow channels 3, so that the dielectric fluid can flow into or out of the battery module composed of the plurality of batteries 1 and the plurality of 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 of the dielectric fluid, so that 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 implementation, 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 the dielectric fluid.

[0052] As an optional implementation, 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 implementation, 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 .

[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, and 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 working 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, and the refrigerant flows in the 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 battery module and the dielectric fluid storage chamber 7, so that the refrigerant can exchange heat with the dielectric fluid, thereby the dielectric fluid in the dielectric fluid storage chamber 7 can be selectively heated or cooled; the second heat exchanger 12 can exchange heat between the refrigerant and the external environment; the throttling device 9 is an expansion valve, and the temperature of the refrigerant can be reduced by throttling and reducing the pressure of the expansion valve; the refrigerant flows in the pipeline 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 achieve the temperature adjustment of the battery 1.

[0058] When the present invention is actually used, the control of the temperature of the battery module requires judging the environment in which the battery module is located, that is, measuring the temperature of the environment in which the battery 1 is located. 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 an important influence on the battery life and performance, and the most suitable operating temperature range is between 15 and 35° C. In order to protect the operating temperature and performance of the battery, the present invention can control the temperature of the battery module between 15 and 35° C.

[0060] The temperature is high in summer, and the ambient temperature of the battery 1 is prone to be high. When the temperature reaches a certain level, the cooling mode is selected for the heat pump heat exchange system 13 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 is heated by heat exchange with the fluorinated liquid in the first heat exchanger 8. When the refrigerant flows into the compressor 11, the temperature of the refrigerant rises due to the pressurization. Then, the refrigerant flows into the second heat exchanger 12 and after heat exchange, the temperature of the refrigerant decreases. After that, the refrigerant flows into the throttling device 9, and the temperature decreases due to the pressure drop after passing through the expansion valve. Finally, the refrigerant returns to the first heat exchanger 8 again and heat exchanges with the fluorinated liquid, so that the temperature of the fluorinated liquid decreases. Furthermore, the battery module is cooled by immersion liquid 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, and 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] The temperature is low in winter, and the ambient temperature of the battery 1 is prone to be low. When the temperature reaches a certain level and the phase change temperature is too high, the heating mode is selected for the heat pump heat exchange system 13 to heat the battery module. When the temperature sensor in the temperature detection controller 6 detects that the temperature of the battery module is lower than 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 is heat exchanged with the fluorinated liquid in the first heat exchanger to reduce the temperature. After flowing into the throttling device 9, the refrigerant temperature is reduced. Then, it flows into the second heat exchanger 12, the temperature rises after heat exchange, and flows into the four-way valve 10. At this time, the four-way valve 10 is set to a mode opposite to the cooling mode. After that, the refrigerant flows into the compressor 11 and the temperature further rises due to the pressurization, and 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", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 should not be understood as a limitation on the present invention.

[0063] The above embodiments are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design 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 all fall within the protection scope 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 arranged 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, and the dielectric fluid is arranged for heat exchange with the composite flexible phase change material (2) and the battery (1); A heat pump heat exchange system (13), wherein the liquid inlet end of the heat pump heat exchange system (13) is connected to the liquid outlet end of the dielectric fluid flow channel (3), and the liquid outlet end of the heat pump heat exchange system (13) is connected to the liquid inlet end of the dielectric fluid flow channel (3), and the heat pump heat exchange system (13) is used for cooling or heating the dielectric fluid.

2. A wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 1, characterized in that: 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.

3. A wide temperature range battery thermal management system with phase change material coupled immersion cooling according to claim 1, characterized in that: 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).

4. A phase change material coupled immersion cooling wide temperature range battery thermal management system 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); The top cover (4) and the base (14) are both provided with pipelines for the flow of the dielectric fluid, 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).

5. A phase change material coupled immersion cooling wide temperature range battery thermal management system according to claim 4, 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).

6. A phase change material coupled immersion cooling wide temperature range battery thermal management system according to claim 4, 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).

7. A phase change material coupled immersion cooling wide temperature range battery thermal management system according to claim 6, 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).

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