CN114678624B - Two-phase immersed battery liquid cooling device for super quick charging of lithium battery and cooling system thereof - Google Patents
Two-phase immersed battery liquid cooling device for super quick charging of lithium battery and cooling system thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of power batteries, and provides a two-phase immersed battery liquid cooling device for super quick charging of a lithium battery and a cooling system thereof. The device adopts the electrical heating membrane to carry out preheating before filling fast to the lithium cell, utilizes the phase transition latent heat of fluoridizing liquid to take away the battery and fill the produced heat of in-process soon afterwards, not only can be under higher initial temperature effectual restriction battery at the temperature rise of filling the in-process soon, but also can be near the control of battery temperature accuracy at fluoridizing liquid boiling point to very big improvement the lithium cell at the thermal safety nature of filling the in-process soon. After the quick charge, utilize the electromagnetic pump with the high temperature of battery box in the liquid pump is gone into the reservoir to the normal atmospheric temperature liquid of injecting into in the battery box, make the lithium cell temperature reduce to the room temperature level rapidly after the quick charge, restrained the inside SEI's of battery growth during follow-up discharge or storage, and then very big improvement lithium ion battery's cycle life.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a two-phase immersed battery liquid cooling device for quick charging of a lithium battery and a cooling system thereof.
Background
In recent years, in order to alleviate the influence caused by energy shortage and environmental pollution, a new energy automobile using a lithium ion battery as a main power source receives global attention, and the global automobile industry gradually changes from a traditional fuel oil automobile to an electric automobile. However, compared to the conventional fuel-oil vehicle, the problems of long charging time and anxiety of mileage become the first bottleneck limiting the development of the electric vehicle. At present, the charging speed of the electric automobile is generally increased by reducing the charging time of the electric automobile, and the charging time is shortened. For example, the battery pack of Nissan Leaf is rapidly charged with 50kw of DC, which can be charged to about 80% of its charge in less than 30 minutes. In order to further shorten the charging time, the united states department of energy (DOE) plans to limit the charging time of electric vehicles to within 15 minutes in the future.
However, the lithium battery is very sensitive to temperature, fast charging is very difficult under a low temperature condition, and low temperature charging can greatly increase the potential safety hazard of the lithium battery. Ouyang et al (Low temperature formation of lithium ion batteries and lithium deposition in large ion lithium ion battery batteries) have studied the fast charging effect of lithium iron phosphate batteries at Low temperatures and observed that the capacity of the batteries decays very significantly when the ambient temperature is Low, and it has been found that the main factor causing the cell capacity decay is the formation of metallic lithium dendrites at the negative electrode, while the growth of the SEI film also leads to a reduction in the amount of available circulating lithium. Therefore, the key factor for realizing the quick charge of the lithium ion battery is to keep the lithium ion battery at the proper temperature. Jaguemont et al (Fast-charging on high-power and high-energy dense cells with 3D-thermal model depletion) have studied the thermal characteristics of lithium ion batteries under the condition of Fast charging, and the study shows that increasing the charging temperature is an effective scheme for realizing Fast charging of lithium ion batteries, and compared with the room temperature environment, the cycle life of the battery can be remarkably prolonged by carrying out Fast charging in the environment higher than the room temperature. However, rapid charging is often accompanied by a large amount of heat generation, which makes it easier for lithium ion batteries with higher initial temperatures to reach thermal runaway trigger temperatures. If not controlled, it may lead to a series of thermal runaway behaviors such as battery rupture, fire and even explosion. Therefore, it is very important to design a set of liquid cooling device and a cooling system of the two-phase immersed battery for super rapid charging of the lithium battery.
Conventional commercial battery thermal management systems currently use air cooling, liquid cooling, and refrigerant direct cooling. The air cooling is to take air as a heat exchange medium, absorb heat generated by the battery in the charging and discharging process through the circulation of the air in the battery pack, and finally discharge the heat to the external environment. However, because the thermal conductivity and specific heat capacity of air are small, when the charge-discharge rate of the battery is high, the air cooling is difficult to meet the requirement of battery thermal management. Different from air cooling, the liquid cooling generally adopts water, mineral oil, ethylene glycol and the like as heat exchange media, and has higher heat conductivity coefficient and larger specific heat capacity compared with air, so that a liquid cooling system has relatively higher cooling efficiency. However, when the battery pack is at a higher charge-discharge rate, the heat generated by the battery is higher, and a great increase in the flow rate of the liquid in the liquid-cooled plate is required. Because the liquid cooling system has more parts and complex structure, the increase of the flow rate of the liquid easily causes the leakage of the cooling liquid, and the potential safety hazard of the battery pack is greatly increased. Different from air cooling and liquid cooling, the direct cooling of the refrigerant adopts the refrigerant as a heat exchange medium. The refrigerant is indirectly contacted with the battery, and the heat generated by the battery in the operation process is absorbed by using the phase change latent heat of the refrigerant, so that the secondary heat exchange process of a cooling medium is omitted, and the refrigerant is convenient to integrate with an air conditioning system of the whole vehicle. However, the requirement of refrigerant direct cooling on the air tightness of the system is high, and meanwhile, the heat dissipation uniformity of the refrigerant direct cooling system is poor, so that a large temperature difference exists between different monomers in the battery pack. Under the condition of quick charging, the SOC states of different battery monomers are inconsistent due to large temperature difference, and potential safety hazards such as overcharge and overdischarge can be caused. Therefore, the heat generated by the battery pack in the quick charging process is difficult to effectively dissipate by the conventional commercial battery heat management scheme. Therefore, a battery thermal management system under a fast charge condition should have a greater cooling capacity than a conventional battery thermal management system. In view of various shortcomings of a heat dissipation method adopted in traditional commercial battery heat management, the invention provides a two-phase immersed battery liquid cooling device for lithium battery quick charging and a cooling system thereof.
Disclosure of Invention
The invention aims to provide a two-phase immersed battery liquid cooling device for lithium battery quick charge and a cooling system thereof, which can effectively limit the temperature rise of a battery in the quick charge process at a higher initial temperature and can accurately control the temperature of the battery to be close to the boiling point of a fluoridized liquid, thereby greatly improving the quick charge efficiency of the lithium battery and the thermal safety in the quick charge process.
The technical scheme of the invention is as follows:
a two-phase submerged battery liquid cooling apparatus for super fast charging of lithium batteries, comprising:
the battery box body 4 is provided with a lug boss 7 with a channel structure on the inner bottom plate thereof and is used for supporting the battery module; the external upper cover plate is provided with a protruding beam 5 and a communication hole 6 for supporting and communicating an upper liquid storage tank 12;
the battery module comprises a lithium battery 1, a porous medium 2 and an electric heating film 3, wherein the porous medium is positioned between the lithium battery 1 and the electric heating film 3; the battery module is arranged on a boss 7 at the bottom in the battery box body 4, and the battery module is partially or completely immersed in the fluorinated liquid 14;
the liquid storage tank 12 is arranged on the beam 5 of the upper cover plate of the battery box body 4, is connected with the battery box body 4 through the communication hole 6, the electromagnetic pump 9 and the liquid guide pipe 8 and is used for storing fluorinated liquid 14;
the cooling pipe comprises a battery box body cooling pipe 10 and a liquid storage tank cooling pipe 11; the battery box cooling pipe 10 is arranged between the upper cover plate of the battery box 4 and the battery module and is used for condensing fluoridized liquid steam generated in the immersed liquid cooling process of the fluoridized liquid; the liquid storage tank cooling pipe 11 is arranged in the liquid storage tank and used for cooling the fluorinated liquid 14 in the liquid storage tank 12;
the liquid level sensor 13 is vertically arranged inside the battery box body 4 and is used for monitoring the liquid level of the fluorinated liquid 14 inside the battery box body 4 in real time;
and the temperature sensor is used for monitoring the temperature of the battery and the temperature of the fluorinated liquid 14 in real time, wherein the temperature of the fluorinated liquid comprises the temperature of the fluorinated liquid inside the battery box body 4 and the temperature of the fluorinated liquid inside the liquid storage tank 12.
The communicating hole 6 connects the liquid storage tank 12 with the battery box body 4 through the electromagnetic valve 15, and when the electromagnetic valve 15 is opened, the fluorinated liquid 14 in the liquid storage tank 12 enters the battery box body 4 through the communicating hole 6 under the action of gravity.
The liquid guide tube 8 connects the liquid storage tank 12 with the battery box body 4 through the electromagnetic pump 9, and when the electromagnetic pump 9 is started, the fluorinated liquid 14 in the battery box body 4 enters the liquid storage tank 12 through the liquid guide tube 8 under the action of pump power.
The porous medium 2 has insulating property and good compatibility with the fluorinated liquid.
The electric heating film 3 has a double-side heating function and indirectly heats the lithium batteries 1 on two sides.
The lithium battery 1 comprises a square battery and a soft package battery, and is totally or partially immersed in the fluorinated liquid 14; the fluorinated liquid 14 has good dielectric characteristics and flame retardant characteristics, and the boiling point of the fluorinated liquid is 45-55 ℃ under normal pressure.
The lug boss 7 has a channel structure, so that the smooth circulation of the fluorinated liquid 14 can be ensured while the battery pack is supported.
A two-phase immersed battery cooling system for lithium battery quick charge is used for cooling the two-phase immersed battery liquid cooling device for lithium battery quick charge, and comprises: a cooling pipe, a compressor 16, a condenser 17 and a throttle valve 18, wherein the inlet of the cooling pipe is connected with the outlet of the throttle valve 18 through a solenoid valve 15, the outlet of the cooling pipe is connected with the compressor 16, and the compressor 16 is connected with the condenser 17; the cooling pipe, the compressor 16, the condenser 17, the throttle valve 18 and the electromagnetic valve 15 are connected in sequence in a ring through pipelines.
The invention has the beneficial effects that:
1) the electric heating film with double-sided heating is clamped between every two batteries, so that the heating speed of the batteries can be obviously improved, and the preheating time of the lithium battery before quick charging is greatly shortened.
2) Utilize the phase transition latent heat of fluoridizing the liquid to take away the battery and fill the produced heat of in-process soon, the radiating efficiency is high, not only can be under higher initial temperature effectual restriction battery fill the temperature rise of in-process soon, but also can be near the control of battery temperature accuracy at fluoridizing liquid boiling point to very big improvement the lithium cell fill the thermal safety nature of in-process soon.
3) The adopted fluorinated liquid has good flame retardant property, and can effectively inhibit a series of thermal runaway behaviors such as ignition and explosion of the battery under extreme working conditions (such as extrusion deformation, overheating and external short circuit of the battery caused by collision).
4) After the quick charge, utilize the electromagnetic pump with the high temperature fluoride liquid pump of battery box in pumping to the reservoir to the normal atmospheric temperature liquid of injecting into in the battery box, make the lithium cell temperature reduce to the room temperature level rapidly after the quick charge, restrained the inside SEI's of battery growth during follow-up discharge (or storage), and then very big improvement lithium ion battery's cycle life.
5) The sensible heat of the fluorinated liquid is utilized to absorb the heat generated by the battery in the conventional discharging stage, so that the cooling energy consumption of the conventional discharging stage system can be reduced to a great extent, and meanwhile, the fluorinated liquid does not flow, so that excellent temperature uniformity exists among different battery monomers in the box body.
6) The liquid storage tank is internally provided with the liquid storage tank cooling pipe, so that the temperature of the fluorinated liquid in the liquid storage tank can be reduced, and the heat generated by the lithium battery in the discharging process can be absorbed at a higher environmental temperature. Meanwhile, when the ambient temperature is low, the electric heating film can be started, and then the cold start of the lithium battery can be realized in a short time. Therefore, the two-phase immersed battery liquid cooling device and the cooling system thereof for super rapid charging of the lithium battery can realize battery thermal management under the full-weather condition.
Drawings
Fig. 1 is a schematic diagram of a cell structure.
Fig. 2 is a schematic structural view of a battery module.
Fig. 3 is a left side view of the battery module.
Fig. 4 is a schematic structural diagram of a battery case.
Fig. 5 is a schematic structural view of the battery case taken along the plane a-a shown in fig. 4.
Fig. 6 is a schematic diagram of a two-phase immersed battery liquid cooling device for super rapid charging of a lithium battery before installation.
Fig. 7 is a schematic diagram of the two-phase immersed battery liquid cooling device for super rapid charging of a lithium battery after installation.
FIG. 8 is a schematic diagram of a two-phase submerged battery cooling system for super fast charge of a lithium battery
In the figure: 1 a lithium battery; 2 a porous medium; 3 electrically heating the film; 4, a battery box body; 5, a cross beam; 6, a communication hole; 7, a boss; 8 a liquid guide pipe; 9 an electromagnetic pump; 10 battery box cooling pipes; 11 liquid storage tank cooling pipes; 12 liquid storage tank; 13 a liquid level sensor; 14, a fluorination liquid; 15 electromagnetic valve; 16 a compressor; 17 a condenser; and (4) a throttle valve 18.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. It is to be understood that such description is merely illustrative of the features and advantages of the present invention, and is not intended to limit the scope of the claims.
The invention discloses a liquid cooling device of a two-phase immersed battery for super quick charge of a lithium battery, which comprises:
the battery box 4 is provided with a boss 7 with a channel structure on the inner bottom plate thereof for supporting the battery module. The outer upper cover plate is provided with a protruding cross member 5 for supporting a reservoir 12 above.
The battery module comprises a lithium ion battery 1, a porous medium 2 and an electric heating film 3, wherein the porous medium is positioned between the lithium ion battery 1 and the electric heating film 3. The battery module is arranged on a boss 7 at the bottom in the battery box, and the battery module is partially or completely immersed in the fluorinated liquid 14.
And the liquid storage tank 12 is arranged on the beam 5 of the upper cover plate of the battery box body 4, is connected with the battery box body 4 through the communication hole 6, the electromagnetic pump 9 and the liquid guide pipe 8 and is used for storing the fluorinated liquid 14.
And the cooling pipes comprise a battery box cooling pipe 10 and a liquid storage tank cooling pipe 11. The battery box cooling pipe 10 is arranged between the upper cover plate of the battery box 4 and the battery module and is used for condensing fluorinated liquid steam generated in the process of the immersed liquid cooling of the fluorinated liquid. A reservoir cooling pipe 11 is installed inside the reservoir for cooling the fluorinated liquid 14 inside the reservoir 12.
And the liquid level sensor 13 is vertically arranged inside the battery box body 4 and is used for monitoring the liquid level of the fluorinated liquid 14 inside the battery box body 4 in real time.
And the temperature sensor is used for monitoring the temperature of the battery and the temperature of the fluorinated liquid 14 in real time, wherein the temperature of the fluorinated liquid comprises the temperature of the fluorinated liquid inside the battery box body 4 and the temperature of the fluorinated liquid inside the liquid storage tank 12.
As shown in fig. 1, a schematic structural diagram of a single cell is shown, and in this example, a blade cell is taken as an example to explain the whole system. The battery module include square battery and laminate polymer battery. The battery module employed in this example was 1 pack of 25 pouch battery modules as shown in fig. 2. The battery module is wholly or partially immersed in the fluorinated liquid 14.
The fluorinated liquid 14 has good dielectric characteristics and flame retardant characteristics and has a boiling point of 45-55 ℃ at normal pressure. FS-49 fluoride liquid having a boiling point of 49 ℃ and having good dielectric characteristics and excellent flame retardancy was used in this example. Meanwhile, the liquid has extremely low Global Warming Potential (GWP) and zero Ozone Depletion Potential (ODP), and belongs to environment-friendly liquid.
The porous medium 2 has good insulating property and good compatibility with the fluorinated liquid. Meanwhile, the porous medium 2 has compressibility and can be closely attached to the lithium battery 1 and the electric heating film 3, as shown in fig. 3. Thereby guaranteeing the temperature uniformity of the battery monomer in the heating process and the heat dissipation process and buffering the stress between the batteries in the driving process. In this example, a high-density foam is used, which has a thickness of 2mm and a thickness of 0.5mm under compression with a pre-load. The foam cotton has excellent capillary property, and can continuously transport the fluorinated liquid to the surface of the battery in the super rapid charging process of the lithium battery, so that the sufficient heat dissipation of the surface of the battery is ensured.
The electric heating film 3 has a double-sided heating function, and can indirectly heat the lithium batteries 1 on two sides at the same time. The graphene electric heating film is used in the example, and can heat the high-density foam cotton on two sides simultaneously, so as to indirectly heat the lithium ion battery. The thickness of the graphene electric heating film is only 0.4mm, and the energy density of the system is improved to a certain extent. Meanwhile, the graphene electric heating film used in the example has excellent self-temperature-limiting characteristics, and even in the case of failure of the temperature controller, the electric heating film does not have an excessively high temperature.
As shown in fig. 4, which is a schematic structural diagram of the battery case, the battery case used in this example is made of aluminum, which not only ensures that the case has strong structural strength, but also greatly reduces the weight of the case. As shown in fig. 5, which is a schematic structural view of the battery case taken along the plane a-a shown in fig. 4, the boss 7 on the bottom plate inside the battery case has a channel structure, so that it can support the battery pack and ensure the smooth flow of the fluorinated liquid 14. In this example, the boss is 2mm high, the channel is 2mm deep and 20mm wide.
Fig. 6 is a schematic diagram of a two-phase immersed battery liquid cooling device for super rapid charging of a lithium battery before installation. The communicating hole 6 connects the liquid storage tank 12 with the battery box body 4 through the electromagnetic valve 15, and when the electromagnetic valve 15 is opened, the fluorinated liquid 14 in the liquid storage tank 12 enters the battery box body 4 through the communicating hole 6 under the action of gravity; the liquid guide pipe 8 connects the liquid storage tank 12 with the battery box body 4 through the electromagnetic pump 9, and when the electromagnetic pump 9 is started, the fluorinated liquid 14 in the battery box body 4 enters the liquid storage tank 12 through the liquid guide pipe 8 under the action of pump power. In this example, a PVC plastic hose is used as the communication hole 6 and the liquid guide tube 8 to prevent reaction with the fluorinated liquid.
Fig. 7 is a schematic diagram of the installed two-phase immersed battery liquid cooling device for super fast charging of a lithium battery. The liquid storage tank 12 is arranged on the beam 5 protruding from the upper cover plate of the box body, and the whole structure is very compact. In this example, the cooling pipes (including the battery box cooling pipe 10 and the reservoir cooling pipe 11) are made of aluminum.
Fig. 8 is a schematic diagram of a two-phase immersed battery cooling system for super fast charge of a lithium battery, where the two-phase immersed battery cooling system for super fast charge of a lithium battery includes: a cooling pipe, a compressor 16, a condenser 17 and a throttle valve 18, wherein the inlet of the cooling pipe is connected with the outlet of the throttle valve 18 through a solenoid valve 15, and the outlet of the cooling pipe is connected with the compressor 16; the cooling pipe, the compressor 16, the condenser 17, the throttle valve 18 and the electromagnetic valve 15 are connected in sequence in a ring through pipelines. In the present example, R134a is adopted as the working medium circulating in the cooling system, wherein R134a absorbs heat released in the condensation process of the fluorinated liquid 14 outside the pipe to vaporize when flowing in the cooling pipe (the battery box cooling pipe 10 or the liquid storage tank cooling pipe 11), and the vaporized R134a is compressed by the compressor 16 and then liquefied in the condenser 17, so as to transfer the heat to the external environment. The liquefied R134a passes through the throttle valve 18 and then returns to the cooling pipe, completing the R134a cycle.
When the battery does not enter a working state, the fluorinated liquid 14 is stored in the two liquid storage tanks 12, and the battery box body 4 is not internally provided with the fluorinated liquid, so that the problem of compatibility between the fluorinated liquid 14 and all materials in the box body is reduced to the greatest extent.
When the battery enters a working state, before the quick charging starts, the electromagnetic valve IV is opened, so that the fluorinated liquid 14 in one of the liquid storage tanks 12 enters the battery box body 4 through the communicating hole 6 under the action of gravity, and when the fluorinated liquid reaches a corresponding liquid level, the liquid level meter 13 transmits a signal to the battery control system, and then the electromagnetic valve IV is closed. At the moment, the battery enters a preheating stage before quick charging, the temperature of the battery is raised to a corresponding set temperature by using the electric heating film, the temperature sensor transmits a battery temperature signal to the battery control system, and then the electric heating film 3 is closed. At the moment, the electromagnetic valve I is opened, so that the cooling working medium enters the battery box cooling pipe 10 to circularly flow. And then the battery enters a quick charging stage, and the fluorinated liquid 14 absorbs the heat generated by the battery in quick charging and over-charging by utilizing self sensible heat or latent heat in the quick charging process. The fluorinated liquid vapor generated by boiling condenses on the surface of the box cooling tube 10 and transfers heat to the cooling medium inside the box cooling tube 10. After the quick charging is finished, the electromagnetic pump I is started, and the fluorinated liquid 14 with high temperature in the battery box body 4 is pumped into the initial liquid storage tank 12 through the liquid guide pipe 8. At this moment, the battery valve I is closed, and the battery valve V is opened, so that the normal-temperature fluorinated liquid 14 in the other liquid storage tank 12 enters the battery box body 4 through the communication hole 6 under the action of gravity, the fluorinated liquid 14 utilizes self sensible heat to cool the lithium battery 1 after the quick charging is finished, and the fluorinated liquid 14 is in direct contact with the lithium battery 1 and does not have any contact thermal resistance, so that the temperature of the battery can be reduced to the room temperature level within a very short time, and the subsequent discharge or storage is facilitated.
However, when the ambient temperature is high (e.g. in tropical regions), the battery valve iii should be opened immediately after the rapid charging is completed, so that the cooling medium enters the reservoir cooling pipe 11, and the temperature of the fluorinated liquid 14 in the reservoir 12 is reduced. Then the battery valve V is opened, so that the low-temperature fluorinated liquid 14 in the liquid storage tank 12 enters the battery box body 4 through the communication hole 6 under the action of gravity, and the temperature of the battery is reduced by utilizing sensible heat so as to facilitate the discharge or storage of the subsequent stage.
In summary, the invention discloses a two-phase immersed battery liquid cooling device for super fast charging of a lithium battery and a cooling system thereof. The device adopts the electric heating membrane to carry out the preheating before filling fast to the lithium cell, utilizes the sensible heat and the latent heat of fluoridizing the liquid to take away the battery at the produced heat of filling the in-process soon afterwards, not only can be under the effectual temperature rise of restriction battery in the in-process of filling fast under higher initial temperature, but also can be near the control of the battery temperature accuracy at fluoridizing the liquid boiling point. After the quick charge, utilize the electromagnetic pump with the high temperature of battery box in the liquid pump go into the reservoir to inject normal atmospheric temperature or low temperature liquid into the battery box, make the lithium cell temperature reduce to the room temperature level rapidly after the quick charge, restrained the inside SEI's of battery growth during follow-up discharge (or storage), and then very big improvement lithium ion battery's cycle life.
The technical solutions and advantages of the present disclosure have been described in detail with reference to the specific examples, and it should be understood that the above description is only exemplary of the present disclosure, and is not intended to limit the present disclosure. The sizes and shapes of the various elements in the drawings are not to be considered as reflecting actual sizes and proportions, but are merely representative of the contents of the present example. Any modification, improvement or equivalent replacement made on the principle and spirit of the present disclosure is within the protection scope of the present disclosure.
Claims (7)
1. A two-phase immersed battery liquid cooling device for super quick charge of a lithium battery is characterized by comprising:
the battery box body (4) is provided with a boss (7) with a channel structure on the inner bottom plate thereof and is used for supporting the battery module; the external upper cover plate is provided with a raised beam (5) and a communicating hole (6) for supporting and communicating a liquid storage tank (12) above;
the battery module comprises a lithium battery (1), a porous medium (2) and an electric heating film (3), wherein the porous medium is positioned between the lithium battery (1) and the electric heating film (3); the battery module is arranged on a boss (7) at the bottom in the battery box body (4), and is partially or completely immersed in the fluorinated liquid (14);
the liquid storage tank (12) is arranged on a cross beam (5) of an upper cover plate of the battery box body (4), is connected with the battery box body (4) through a communication hole (6), an electromagnetic pump (9) and a liquid guide pipe (8) and is used for storing fluorinated liquid (14);
the cooling pipe comprises a battery box body cooling pipe (10) and a liquid storage tank cooling pipe (11); the battery box cooling pipe (10) is arranged between the upper cover plate of the battery box (4) and the battery module and is used for condensing fluorinated liquid steam generated in the immersed liquid cooling process of the fluorinated liquid; the liquid storage tank cooling pipe (11) is arranged in the liquid storage tank and used for cooling the fluorinated liquid (14) in the liquid storage tank (12);
the liquid level sensor (13) is vertically arranged inside the battery box body (4) and is used for monitoring the liquid level of the fluorinated liquid (14) inside the battery box body (4) in real time;
and the temperature sensor is used for monitoring the temperature of the battery and the temperature of the fluoridizing liquid (14) in real time, wherein the temperature of the fluoridizing liquid comprises the temperature of the fluoridizing liquid in the battery box body (4) and the temperature of the fluoridizing liquid in the liquid storage tank (12).
2. The liquid cooling device of the two-phase immersed battery for super rapid charging of the lithium battery as claimed in claim 1, wherein the porous medium (2) is tightly attached to the lithium battery (1) and the electric heating film (3), and the porous medium (2) has compressibility to buffer the stress between the batteries during driving and to be tightly attached to the lithium battery (1) and the electric heating film (3), so as to ensure the temperature uniformity of the battery cells during the heating process and the heat dissipation process.
3. The liquid cooling device of the two-phase immersed battery for super quick charge of the lithium battery as claimed in claim 1, wherein the communication hole (6) connects the liquid storage tank (12) with the battery box body (4) through the electromagnetic valve (15), and when the electromagnetic valve (15) is opened, the fluorinated liquid (14) in the liquid storage tank (12) enters the battery box body (4) through the communication hole (6) under the action of gravity.
4. The two-phase immersed battery liquid cooling device for the super rapid charging of the lithium battery as claimed in claim 1, wherein the liquid guide tube (8) connects the liquid storage tank (12) with the battery box body (4) through the electromagnetic pump (9), and when the electromagnetic pump (9) is started, the fluorinated liquid (14) inside the battery box body (4) enters the liquid storage tank (12) through the liquid guide tube (8) under the action of pump work.
5. The liquid cooling device for the two-phase immersed battery for super rapid charging of the lithium battery as claimed in claim 1, wherein the porous medium (2) has insulating properties and good compatibility with the fluorinated liquid.
6. The liquid cooling device of a two-phase immersed battery for super rapid charging of a lithium battery as claimed in claim 1, wherein the electrically heated film (3) has a double-sided heating function and indirectly heats the lithium batteries (1) on both sides.
7. A two-phase immersed battery cooling system for lithium battery quick charging, which is used for cooling the two-phase immersed battery liquid cooling device of any one of claims 1 to 6, wherein the two-phase immersed battery cooling system for lithium battery quick charging comprises: the cooling system comprises a cooling pipe, a compressor (16), a condenser (17) and a throttle valve (18), wherein the inlet of the cooling pipe is connected with the outlet of the throttle valve (18) through an electromagnetic valve (15), the outlet of the cooling pipe is connected with the compressor (16), and the compressor (16) is connected with the condenser (17); the cooling pipe, the compressor (16), the condenser (17), the throttle valve (18) and the electromagnetic valve (15) are connected into a ring in sequence through pipelines.
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