CN218039450U - Immersed phase-change liquid cooling device - Google Patents
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- CN218039450U CN218039450U CN202222350373.4U CN202222350373U CN218039450U CN 218039450 U CN218039450 U CN 218039450U CN 202222350373 U CN202222350373 U CN 202222350373U CN 218039450 U CN218039450 U CN 218039450U
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Abstract
The utility model discloses an submergence formula phase transition liquid cooling plant, including porous battery frame, temperature sensor, water conservancy diversion subassembly, electromagnetism check valve, submergence formula liquid cooling battery compartment and pressure sensor. The utility model discloses use the boiling technique of flowing to improve phase transition liquid cooling heat transfer performance by a wide margin, realize that efficiency in groups reaches more than 90%. The utility model discloses a gradient interval has improved the interclass difference in temperature that traditional battery module design in-process arouses owing to natural convection and heat gathering effect, makes the battery module maximum temperature difference reduce to below 2 ℃, has high temperature uniformity. The utility model discloses a porous battery frame and water conservancy diversion subassembly's introduction, can overcome submergence formula cooling design in-process quality because the battery monomer difference in temperature that boundary layer effect and flow field structure arouse, further improve the temperature uniformity.
Description
Technical Field
The utility model relates to a battery temperature regulation and control field specifically is an submergence formula liquid cooling plant that changes phase.
Background
With the development of economy, the quantity of automobile reserves is rapidly increased, and energy shortage and environmental pollution are brought while the economic development efficiency is accelerated. In order to alleviate the situation, the development of new energy automobiles is energetically significant. The pure electric vehicle has gradually become the first choice for purchasing new energy vehicles due to the advantages of small pollution, high energy utilization efficiency, low noise, strong comfort and the like.
The safety and the service life of the lithium ion battery pack serving as a power source of the pure electric vehicle become important factors restricting the development of the industry. For safety, a number of vehicle auto-ignition events stem from battery issues. The reason is that the overall temperature of the battery is increased in the working process, a large amount of heat is generated particularly under the condition of high-rate charge and discharge, and if the heat is not conducted out in time, thermal runaway is caused, violent combustion and even explosion occur, so that the battery thermal management system of the electric automobile becomes an indispensable important component.
Existing battery thermal management means include air cooling, liquid cooling, phase change material cooling and the like, but in the face of future high-power batteries, submerged flowing boiling heat is one of the most promising thermal management technologies. Many researches show that compared with the existing heat management means, the heat conduction capacity of the flowing boiling is dozens of times of that of the traditional heat management means, and the temperature rise can be controlled below 5 ℃ under the charge-discharge multiplying power of 5℃ and is far lower than 20 ℃ of the air cooling.
The energy density of the power battery pack of the electric automobile has been shown to be doubled in recent years for the service life, which also leads to the further increase of the number of internal power batteries. In the charging and discharging process of the power battery pack, due to the arrangement mode of batteries, boundary convection and heat accumulation effect, the discharging temperature of the power batteries is inevitably inconsistent, and further, the charging and discharging internal resistance, voltage and capacity of the power batteries are different. The increasing number of the single batteries of the power battery pack inevitably leads to a wooden barrel effect, namely, the single battery with the lowest capacity limits the integral energy storage capacity of the battery module. The non-uniformity of the local temperature in the discharging process of the battery pack further causes the overcharge and the overdischarge of partial battery monomers, and the butterfly effect is caused by the end of the service life of partial batteries, so that the service life of the battery pack connected with the battery pack in series is influenced.
Therefore, for the future high-energy density battery pack, an immersed phase-change liquid cooling device is developed, and the immersed phase-change liquid cooling device is very important for prolonging the service life and ensuring the use safety.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model aims to solve the technical problem that an submergence formula phase transition liquid cooling plant is provided.
The technical scheme of the utility model for solving the technical problems is to provide an immersed phase-change liquid cooling device, which is characterized in that the liquid cooling device comprises a porous battery rack, a temperature sensor, a flow guide assembly, an electromagnetic one-way valve, an immersed liquid cooling battery compartment and a pressure sensor;
the bottom in the immersed liquid-cooled battery cabin is provided with a plurality of battery tanks, and each battery tank is internally provided with a power battery; along the arrangement direction of the battery tanks, the distance between two adjacent battery tanks is increased in gradient from the side wall of the immersed liquid-cooled battery compartment to the central position, the distance between the inner side of the side wall of the immersed liquid-cooled battery compartment and the two battery tanks on the outermost side is the smallest, and the distance between the two battery tanks on the central position is the largest;
a porous battery rack is arranged at each battery jar; the porous battery rack is fixed on the bottom in the immersed liquid-cooled battery cabin; the porous battery rack is closely contacted with each power battery and supports the power batteries; two ends of the plurality of flow guide assemblies are respectively fixed between two adjacent porous battery racks or between the inner side of the side wall of the immersed liquid-cooled battery cabin and the two outermost porous battery racks and are used for guiding the flow of low-boiling-point working media; each power battery is provided with a temperature sensor for measuring the temperature of each power battery; the immersed liquid-cooled battery cabin is provided with a working medium inlet and a working medium outlet; and the working medium outlet is provided with an electromagnetic one-way valve and a pressure sensor, and the pressure sensor is used for measuring the internal pressure of the immersed liquid cooling battery compartment and regulating and controlling the internal pressure of the immersed liquid cooling battery compartment by opening and closing the electromagnetic one-way valve.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) The utility model discloses use the boiling technique of flowing to improve phase transition liquid cooling heat transfer performance by a wide margin, compare in traditional accuse temperature mode, through the test, the utility model discloses can satisfy the accuse temperature demand of the high charge-discharge multiplying power of racetrack. And can use less working medium to carry out the temperature control of the whole working condition to the electric automobile, and then realize that the uniting efficiency reaches more than 90%.
(2) The utility model discloses a gradient interval has improved the interclass difference in temperature that causes because natural convection and heat gathering effect in traditional battery module design process. Theoretical analysis and experiments prove that the boiling state among all power batteries can be regulated and controlled by introducing the gradient intervals, so that the heat taken away by the power batteries through flowing boiling is equivalent to the heat taken away by combining the flowing boiling through heat conduction, the temperature difference among the batteries is remarkably reduced, the maximum temperature difference of the battery modules is reduced to be below 2 ℃, and the temperature consistency is extremely high. And the utility model discloses a gradient interval is applicable to the arbitrary connected mode of series connection, parallelly connected or series-parallel of power battery.
(3) The utility model discloses a porous battery frame and water conservancy diversion subassembly's introduction, can overcome the battery monomer difference in temperature that the submergence formula cooling design in-process quality arouses because boundary layer effect and flow field structure. Theoretical analysis and experiments prove that the distribution of the immersed liquid cooling flow field can be improved by the guide assemblies distributed in the logarithmic curve and the Fibonacci spiral line, and sufficient nucleation sites are added while the contact thermal resistance is reduced by matching with the porous battery frame, so that the boiling heat exchange of the low-boiling-point working medium is enhanced, and the temperature consistency is further improved.
(4) The utility model discloses to each part in the overall design messenger storehouse of submergence formula liquid cooling battery compartment in close contact with, support each other, reinforcing structural rigidity, stability and reduction contact thermal resistance.
(5) The electromagnetic one-way valve and the pressure sensor are matched with each other, pressure distribution in the bin can be reasonably adjusted, self-driving of the working medium is achieved by utilizing pressure difference in the phase change process, and energy consumption caused by intervention of the pump is reduced. The automatic circulation of the low-boiling point working medium in the system can be realized through the pressure difference generated by the gas-liquid phase change of the low-boiling point working medium under the working conditions of low-speed and low-power discharge, and a circulating pump is not required to provide power. Under the working condition of high-speed and high-power discharge, the circulating pump is used for providing power in an auxiliary mode, and the energy-saving effect is achieved.
Drawings
Fig. 1 is a schematic front view of an overall structure of an embodiment of the present invention;
fig. 2 is a schematic front view of the overall structure of another embodiment of the present invention;
fig. 3 is a perspective view of the immersed liquid-cooled battery compartment of the present invention;
fig. 4 is an installation diagram of the power battery, the porous battery rack and the flow guide assembly of the present invention;
FIG. 5 is a block diagram of the thermal management system of the present invention;
fig. 6 is a graph of the maximum temperature difference of 12 power batteries with different gradient distances according to the embodiment 1 of the present invention;
fig. 7 is a temperature distribution curve diagram of 12 power batteries with different gradient pitches of the invention in the case of testing time of 40s and 116s in the embodiment 1;
fig. 8 is a graph showing the average temperature rise of 12 power batteries with different grouping efficiencies according to embodiment 1 of the present invention as a function of the test time;
fig. 9 is a graph showing the maximum temperature difference of 12 power batteries with different grouping efficiencies according to the embodiment 1 of the present invention, as a function of the test time.
In the figure, a power battery 101, a porous battery frame 102, a temperature sensor 103, a flow guide assembly 104, an electromagnetic one-way valve 105, a battery jar 106, an immersed liquid-cooled battery compartment 107, a tab 108, a tab connecting sheet 109, a working medium inlet 110, a working medium outlet 111, a circulating pump 112, a liquid storage tank 113, a one-way valve 114, a pressure sensor 115 and a condenser 116.
Detailed Description
Specific embodiments of the present invention are given below. The specific embodiments are only used for further detailed description of the present invention, and do not limit the scope of the claims of the present invention.
The utility model provides an immersed phase-change liquid cooling device (liquid cooling device for short), which is characterized in that the liquid cooling device comprises a porous battery frame 102, a temperature sensor 103, a flow guide assembly 104, an electromagnetic one-way valve 105, an immersed liquid cooling battery chamber 107 and a pressure sensor 115;
the bottom in the immersed liquid-cooled battery chamber 107 is provided with a plurality of (preferably, at least three) battery tanks 106, the battery tanks 106 are used for placing the power batteries 101, and each battery tank 106 is internally provided with one power battery 101; the battery jar 106 is a main temperature equalizing component for improving the heat accumulation of the battery module and the natural convection temperature difference of the shell; along the arrangement direction of the battery jars 106, from the side wall of the immersed liquid-cooled battery compartment 107 to the center position, the distance between two adjacent battery jars 106 is increased in gradient, the distance between the inner side of the side wall of the immersed liquid-cooled battery compartment 107 and two outermost battery jars 106 (namely, the first battery jar 106 or the last battery jar 106) is the smallest, and the distance between two battery jars 106 at the center position is the largest;
a porous battery holder 102 is arranged at each battery jar 106; the porous battery holder 102 is fixed on the bottom in the immersed liquid-cooled battery compartment 107, and the inner wall of the porous battery holder is flush with the wall of the battery tank 106; each porous battery frame 102 is internally provided with a power battery 101 which is tightly contacted with the respective power battery 101 and supports the power battery 101; two ends of the plurality of flow guide assemblies 104 are respectively fixed between two adjacent porous battery frames 102 or between the inner side of the side wall of the immersed liquid-cooled battery compartment 107 and the two outermost porous battery frames 102 (namely, the first porous battery frame 102 or the last porous battery frame 102) for guiding the flow of the working medium with low boiling point; each power battery 101 is provided with a temperature sensor 103 for measuring the temperature of each power battery 101; the immersed liquid-cooled battery compartment 107 is provided with a working medium inlet 110 and a working medium outlet 111; an electromagnetic check valve 105 and a pressure sensor 115 are arranged at the working medium outlet 111, and the pressure sensor 115 is used for measuring the internal pressure of the immersed liquid cooling battery compartment 107 and regulating and controlling the internal pressure of the immersed liquid cooling battery compartment 107 by opening and closing the electromagnetic check valve 105.
Preferably, the battery slots 106 at the same positions on the left and right sides are equally spaced with the center position as the axis of symmetry.
Preferably, the pitch is calculated by the formula f (x) = kx + b, where f (x) is the pitch value of the x-th pitch, k is the gradient, and k is 6% to 45%, and b = (the length of the immersed liquid-cooled battery compartment 107 in the arrangement direction of the battery slots 106-the number of the power batteries 101 ×. The thickness of the power batteries 101)/2), so that the pitch gradually increases from the minimum pitch to the maximum pitch with a gradient of 6% to 45%, and the pitches are distributed in an arithmetic progression. In this embodiment, the minimum distance is 1-6 mm, which can meet the temperature control requirement of high load discharge.
Preferably, if the number of the battery slots 106 is n, the number of the flow guide assemblies 104 is n +1; when n is an odd number, the two battery slots 106 at the center position are the (n-1/2) th battery slot and the (n + 1/2) th battery slot, or the (n + 1/2) th battery slot and the (n + 3/2) th battery slot; when n is an even number, the two battery slots 106 at the center position are the nth/2 th battery slot and the n +2/2 th battery slot.
Preferably, the porous battery frame 102 is used as a main part for fixing the power battery 101 and a main nucleation site, and has a strong pre-tightening force; the porous structure increases boiling nucleation sites and strengthens boiling heat exchange; the material is high thermal conductivity foam metal, has higher structural strength and PPI (pore density) higher than 2000; the wall thickness is less than 0.5mm.
Preferably, the flow guide assembly 104 is a main component for improving the temperature difference of the single body of the power battery 101 and is composed of three flow guide plates; the three guide plates are arranged along the vertical direction, and two side walls of the three guide plates are respectively fixed between two adjacent porous battery racks 102 or between the inner side of the side wall of the immersed liquid-cooled battery bin 107 and the two outermost porous battery racks 102; the arrangement of the three guide plates obeys logarithmic distribution or Fibonacci spiral distribution;
when three guide plates are arranged and obey logarithmic distribution, taking the vertical wall surface of the immersed liquid-cooled battery compartment 107 provided with the working medium inlet 110 as an x axis, taking the upper surface of the bottom surface of the immersed liquid-cooled battery compartment 107 as a y axis, making a logarithmic curve with the bottom number of a, respectively taking coordinate points corresponding to x =1/3a, 2/3a and a on the logarithmic curve, then installing one guide plate according to a line segment formed by the coordinate point corresponding to x =1/3a and the midpoint of the vertical side of the side surface of the porous battery frame 102, installing one guide plate according to a line segment formed by the coordinate point corresponding to x =2/3a and the diagonal point of the side surface of the porous battery frame 102, and installing one guide plate according to a line segment formed by the coordinate point corresponding to x = a and the midpoint of the top edge of the side surface of the porous battery frame 102;
when three guide plates are arranged to obey Fibonacci spiral distribution, taking the vertical wall surface of the immersed liquid-cooled battery chamber 107 provided with the working medium inlet 110 as an x axis, taking the upper surface of the bottom surface of the immersed liquid-cooled battery chamber 107 as a y axis, making a Fibonacci spiral, taking coordinate points corresponding to three points of x = F3.5, F3 and F2.5 on the Fibonacci spiral, then installing one guide plate according to a line segment formed by the coordinate point corresponding to x = F3.5 and the middle point of the vertical edge of the side surface of the porous battery holder 102, installing one guide plate according to a line segment formed by the coordinate point corresponding to x = F3 and the diagonal point of the side surface of the porous battery holder 102, and installing one guide plate according to a line segment formed by the coordinate point corresponding to x = F2.5 and the middle point of the top edge of the side surface of the porous battery holder 102.
Preferably, the working fluid outlet 111 is a tapered outlet such that the flow field around each power cell 101 in the submerged liquid-cooled battery compartment 107 tends to be uniform.
Preferably, the main body of the immersion liquid-cooled battery compartment 107 is made of aluminum alloy, and is divided into a top cover and a compartment body. During assembly and maintenance, the top cover is opened, the power battery 101 is inserted into the porous battery frame 102 with pretightening force, and the power battery and the porous battery frame are in close contact; after the assembly and the overhaul are finished, the top cover and the bin body are fixed through a corrosion-resistant fluororubber sealing ring and a bolt.
Preferably, the walls of the battery well 106 are coated with an insulating coating to insulate the interface of the power battery 101 and the submerged liquid-cooled battery compartment 107.
Preferably, the working medium with low boiling point adopts an insulating, high-stability and flashpoint-free working medium, preferably R141b (monofluoro-dichloroethane).
Preferably, the tab 108 and the tab connecting sheet 109 of the power battery 101 are opposite to the working medium inlet 110 of the immersed liquid cooling battery compartment 107, so that the tab 108 which generates high heat and various parts connected with the tab are cooled, and the internal temperature difference of the single battery is reduced.
Preferably, the solenoid check valve 105 is mounted at the working medium outlet 111 by a fluoro-rubber seal ring and a self-snap collar.
The utility model simultaneously provides an submergence formula of device flows boiling thermal management system (heat management system for short), its characterized in that, this thermal management system includes circulating pump 112, liquid reserve tank 113, check valve 114, controller and condenser 116;
liquid working medium with low boiling point is stored in the liquid storage tank 113; a working medium inlet 110 of the immersed liquid cooling battery compartment 107 is communicated with an outlet of a liquid storage tank 113 through a pipeline, and a one-way valve 114 is arranged on the pipeline; the one-way valve 114 realizes that the working medium with low boiling point can only flow to the immersed liquid cooling battery compartment 107 from the liquid storage tank 113, but can not flow to the liquid storage tank 113 from the immersed liquid cooling battery compartment 107; the working medium outlet 111 of the immersed liquid cooling battery compartment 107 is communicated with the inlet of the condenser 116 through a pipeline; the condenser 116 is used for condensing the gasified low-boiling point working medium steam into liquid; the outlet of the condenser 116 is communicated with the inlet of the liquid storage tank 113 through a pipeline; a circulating pump 112 is arranged in the whole circulating pipeline and is used as a power source for flowing of the low-boiling-point working medium (in the embodiment, an outlet of the condenser 116 is communicated with an inlet of the liquid storage tank 113 through a pipeline, and the circulating pump 112 is arranged on the pipeline);
the controller is respectively connected with the circulating pump 112, the temperature sensor 103, the electromagnetic one-way valve 105 and the pressure sensor 115 in a communication way.
The utility model discloses a work flow is:
starting the battery module, and when the controller monitors that the temperatures measured by all the temperature sensors 103 are less than 40 ℃, enabling the low-boiling-point working medium to enter a self-driving mode; in the self-driving mode, the controller controls the circulation pump 112 and the electromagnetic one-way valve 105 to be closed, and the immersed liquid-cooled battery compartment 107 is in a closed state; the low boiling point working medium in the immersed liquid cooling battery compartment 107 rapidly absorbs heat and undergoes gas-liquid phase change under the action of the porous battery frame 102, the internal pressure of the immersed liquid cooling battery compartment 107 is continuously increased due to the continuous increase of the gas phase until the pressure detected by the pressure sensor 115 reaches the pressure difference required for overcoming the on-way resistance, the controller controls the electromagnetic one-way valve 105 to be opened, the low boiling point working medium in a gas-liquid two-phase coexistence state flows out from the working medium outlet 111 under the driving of the pressure difference, flows through the condenser 116 to become a liquid phase, the liquid low boiling point working medium flows through the liquid storage tank 113 and pushes the liquid low boiling point working medium in the liquid storage tank 113 to flow, enters the immersed liquid cooling battery compartment 107 from the working medium inlet 110 through the one-way valve 114, then flow is redistributed under the action of the battery tank 106 with gradient spacing, the flow is guided through the flow guide assembly 104 until the power battery 101 is immersed in the low boiling point working medium, the heat generated by the power battery 101 is taken away under the action of intensified boiling of the porous battery frame 102, and the electromagnetic cooling battery compartment 107 is closed until the internal pressure is in a stable state, and the electromagnetic cooling one-way valve 105 is closed, and the electromagnetic cooling cycle is completed;
when the controller monitors that the highest value of the temperature measured by all the temperature sensors 103 is more than 40 ℃, the working medium with the low boiling point enters a forced convection mode; in the forced convection mode, the controller controls the circulation pump 112 and the electromagnetic one-way valve 105 to be opened, and the low-boiling-point working medium flows out of the liquid storage tank 113 under the driving of the circulation pump 112 and enters the immersed liquid-cooled battery compartment 107 from the working medium inlet 110 through the one-way valve 114; then, after the flow is redistributed under the action of the battery tanks 106 with gradient spacing, the flow is guided by the guide assembly 104 until the power battery 101 is immersed in the working medium with low boiling point, the heat generated by the power battery 101 is taken away under the action of the enhanced boiling heat exchange of the porous battery frame 102, and then the heat flows out from the working medium outlet 111 to complete a cooling cycle; in the forced convection mode, when the controller monitors that the temperature measured by all the temperature sensors 103 is reduced to 20-30 ℃, the controller controls the circulation pump 112 and the electromagnetic one-way valve 105 to be closed, and the low-boiling point working medium enters the self-driving mode.
Example 1
As shown in fig. 1, in the present embodiment, n =12 power cells 101 are used, and the tab 108 and the tab connecting piece 109 of each power cell 101 are upward (i.e., on the top); the length of the immersed liquid-cooled battery compartment 107 is 400mm, and the thickness of the power battery 101 is 27mm; in this embodiment, the gradually increasing pitches of the gradients of k =0%, 6%, 45%, 81%, and 110% are adopted, for example, the minimum pitch corresponding to the 6% gradient is f (1) =0.06 × 1+5.62=5.68mm. In the embodiment, the low-boiling point working medium adopts R141b, the saturation temperature is 32.1 ℃ under normal pressure, the inlet working medium is in a supercooled state, and the flow speed is 0.01m/s. The utility model discloses the relative suitable velocity of flow of used velocity of flow for being applied to battery thermal current accuse temperature.
As can be seen from fig. 6, in the case of different gradient pitches, the temperature difference of each cell undergoes a state of increasing and then decreasing and then gradually approaches to a stable state, and the corresponding flow state gradually transits from supercooling convection to flow boiling.
As can be seen from fig. 7, the inter-group cell temperature distribution in the convection and boiling regions without using the gradient pitch shows a state in which the middle cell temperature is higher than the two sides, but as the pitch gradient gradually increases, the temperature distribution in both the convection region and the boiling region gradually becomes uniform and then changes to a state in which the middle cell temperature is lower than the two sides. Therefore, the utility model discloses k takes 6% ~ 45% within range's interval gradient can make battery module have better temperature uniformity.
This example tested the change in heat transfer characteristics of the battery module over time at 73%, 80%, 84%, 98%, and 95% pack efficiency, respectively, which was calculated as the volume of the submerged liquid-cooled battery compartment 107 divided by the volume of the power cell 101.
As can be seen from fig. 8, the temperature rise of the internal battery of the liquid cooling device is basically kept consistent when the liquid cooling device transits from the super-cooled convection state to the boiling state along with the gradual increase of the group efficiency.
As can be seen from FIG. 9, with the increase of the packing efficiency, the working fluid is easier to reach the boiling state, and the maximum temperature difference between the packs is maintained within 0.8K. Therefore the utility model discloses liquid cooling device gradient interval and efficiency in groups can effectively improve the battery module uniformity.
The characteristics are tested by taking the track discharge data of the high-performance electric racing car as a reference, and the temperature control performance and the battery consistency can ensure the use requirements of the household electric car.
Example 2
As shown in fig. 2, in this embodiment, the tab 108 and the tab connecting sheet 109 of the power battery 101 are directly opposite to the working medium inlet 110 of the immersion type liquid cooling battery compartment 107, so that the tab 108 which generates high heat and each part connected with the tab are cooled, and the internal temperature difference of the single battery is reduced.
The utility model discloses the nothing is mentioned the part and is applicable to prior art.
Claims (10)
1. An immersed phase-change liquid cooling device is characterized by comprising a porous battery frame, a temperature sensor, a flow guide assembly, an electromagnetic one-way valve, an immersed liquid-cooled battery cabin and a pressure sensor;
the bottom in the immersed liquid-cooled battery compartment is provided with a plurality of battery tanks, and each battery tank is internally provided with a power battery; along the arrangement direction of the battery tanks, the distance between two adjacent battery tanks is increased in gradient from the side wall of the immersed liquid-cooled battery compartment to the central position, the distance between the inner side of the side wall of the immersed liquid-cooled battery compartment and the two battery tanks on the outermost side is the smallest, and the distance between the two battery tanks on the central position is the largest;
a porous battery rack is arranged at each battery jar; the porous battery rack is fixed on the bottom in the immersed liquid-cooled battery cabin; the porous battery rack is closely contacted with each power battery and supports the power batteries; two ends of the plurality of flow guide assemblies are respectively fixed between two adjacent porous battery racks or between the inner side of the side wall of the immersed liquid-cooled battery cabin and the two outermost porous battery racks and are used for guiding the flow of low-boiling-point working media; each power battery is provided with a temperature sensor for measuring the temperature of each power battery; the immersed liquid-cooled battery cabin is provided with a working medium inlet and a working medium outlet; and the working medium outlet is provided with an electromagnetic one-way valve and a pressure sensor, and the pressure sensor is used for measuring the internal pressure of the immersed liquid cooling battery compartment and regulating and controlling the internal pressure of the immersed liquid cooling battery compartment by opening and closing the electromagnetic one-way valve.
2. The immersed phase-change liquid cooling device according to claim 1, wherein the battery tanks at the same positions on the left and right sides are equally spaced with respect to a central position as a symmetry axis.
3. An immersed phase-change liquid cooling device according to claim 1, wherein the spacing is calculated by the formula f (x) = kx + b, where f (x) is the spacing value of the x-th spacing, k is the gradient, k is 6% to 45%, and b = (length of the immersed liquid-cooled battery compartment-number of power cells = thickness of power cells)/2.
4. The immersed phase-change liquid cooling device according to claim 1, wherein the number of the battery tanks is n, and the number of the flow guide assemblies is n +1; when n is an odd number, the two battery slots at the central position are the (n-1/2) th battery slot and the (n + 1/2) th battery slot, or the (n + 1/2) th battery slot and the (n + 3/2) th battery slot; when n is an even number, the two battery slots at the center position are the nth/2 battery slot and the n +2/2 battery slot.
5. The immersed phase-change liquid cooling device as claimed in claim 1, wherein the porous battery holder is made of foam metal with high thermal conductivity, and PPI is higher than 2000; the wall thickness of the porous cell holder is less than 0.5mm.
6. The submerged phase-change liquid cooling device of claim 1, wherein the flow guide assembly is composed of three flow guide plates; the three guide plates are arranged along the vertical direction, and two side walls of the three guide plates are respectively fixed between two adjacent porous battery racks or between the inner side of the side wall of the immersed liquid-cooled battery cabin and the two outermost porous battery racks; the arrangement of the three guide plates obeys logarithmic distribution or Fibonacci spiral distribution.
7. The immersed phase-change liquid cooling device according to claim 6, wherein when three guide plates are arranged to comply with logarithmic distribution, a logarithmic curve with the base number a is drawn with the vertical wall surface of the immersed liquid-cooled battery compartment provided with the working medium inlet as an x-axis and the upper surface of the bottom surface of the immersed liquid-cooled battery compartment as a y-axis, coordinate points corresponding to three points x =1/3a, 2/3a and a are respectively taken on the logarithmic curve, then one guide plate is installed according to a line segment formed by the coordinate point corresponding to x =1/3a and the midpoint of the vertical side of the side surface of the porous battery rack, one guide plate is installed according to a line segment formed by the coordinate point corresponding to x =2/3a and the diagonal point of the side surface of the porous battery rack, and one guide plate is installed according to a line segment formed by the coordinate point corresponding to x = a and the midpoint of the top edge of the side surface of the porous battery rack.
8. An immersed phase-change liquid cooling device according to claim 6, wherein when three guide plates are arranged to follow a Fibonacci spiral distribution, coordinate points corresponding to three points x = F3.5, F3 and F2.5 are taken on the Fibonacci spiral line with the vertical wall surface of the immersed liquid-cooled battery compartment provided with the working medium inlet as an x axis and the upper surface of the bottom surface of the immersed liquid-cooled battery compartment as a y axis, and one guide plate is arranged according to a line segment formed by the coordinate point corresponding to x = F3.5 and a midpoint of the vertical edge of the side surface of the porous battery holder, one guide plate is arranged according to a line segment formed by the coordinate point corresponding to x = F3 and a diagonal point of the side surface of the porous battery holder, and one guide plate is arranged according to a line segment formed by the coordinate point corresponding to x = F2.5 and a midpoint of the top edge of the side surface of the porous battery holder.
9. The immersed phase-change liquid cooling device according to claim 1, wherein the working medium outlet is a tapered outlet, so that flow fields around each power battery in the immersed liquid-cooled battery compartment tend to be uniform.
10. An immersed phase-change liquid cooling device as claimed in claim 1 wherein the walls of the cell tank are coated with an insulating coating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116470189A (en) * | 2023-06-01 | 2023-07-21 | 天津提尔科技有限公司 | Submerged battery thermal management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116470189A (en) * | 2023-06-01 | 2023-07-21 | 天津提尔科技有限公司 | Submerged battery thermal management system |
| CN116470189B (en) * | 2023-06-01 | 2023-08-18 | 天津提尔科技有限公司 | Submerged battery thermal management system |
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