Lithium battery immersion cooling box body based on rotational flow jet flow coherent nozzles

Abstract

The invention provides a lithium battery immersion cooling box body based on rotational flow jet flow coherent nozzles. The lithium battery immersion cooling box body comprises a battery box, a pumping system and a jet flow pipeline, a battery module is placed at the bottom of the battery box, an inlet and an outlet are formed in the side wall of the battery box, and pumping systems for conveying fluorinated liquid are arranged at the inlet and the outlet; the jet flow pipelines are distributed at the top of the battery box in a staggered manner, a plurality of rotational flow jet flow nozzles are arranged on the jet flow pipelines, and outlets of the rotational flow jet flow nozzles are aligned to the battery modules; the jet flow pipeline is communicated with the inlet, and an electromagnetic valve is arranged on the jet flow pipeline and used for dividing the jet flow pipeline into a jet flow pipeline A and a jet flow pipeline B; the jet area of the jet pipeline A is not smaller than that of the jet pipeline B; and the on-off of the electromagnetic valve is selectively controlled according to the charge-discharge multiplying power, so that the jet flow pipeline A works or the jet flow pipeline A and the jet flow pipeline B work together. The phase change latent heat of the fluorinated liquid can be used for taking away heat generated in the charging and discharging process of the battery.

Description

Technical Field

[0001] The invention relates to the field of lithium battery cooling, and in particular to a lithium battery immersion cooling box based on a swirl jet coherent nozzle. Background Art

[0002] In recent years, lithium-ion batteries, as the main power source of contemporary new energy vehicles, have the advantages of high energy density, high operating voltage, many cycles, and a wide operating temperature range. However, the heat generated by lithium batteries during the charging and discharging process can lead to thermal runaway, explosion, and combustion. Temperature has a great influence on the working performance of lithium batteries. It is of great significance to study the efficient lithium battery thermal management system to control the working temperature of lithium-ion batteries within the optimal working temperature range of 25℃~40℃. When the temperature is uneven between the battery cells in the battery system, the rates of the electrochemical reaction and self-discharge reaction of the battery will also be uneven. This imbalance will lead to differences in the cycle life, capacity, and internal resistance between the battery cells. The temperature difference in the battery pack must be controlled within 5℃ to ensure the consistency requirements of the battery system. Therefore, the air convection heat exchange technology used in traditional air cooling has gradually begun to fail to meet the needs of electric vehicles. Compared with traditional thermal management technology, battery immersion cooling technology has shown significant advantages in temperature control performance and temperature consistency.

[0003] Use fluorinated liquid or insulating mineral oil as the coolant of the cooling system, immerse the battery in the coolant, and the lithium battery is in full contact with the cooling medium, which has extremely high heat dissipation. It can effectively reduce the temperature rise during the charging and discharging process of the lithium battery pack. However, although the existing lithium-ion battery immersion cooling technology has its advantages, it is easy to cause the temperature of the lithium battery at the inlet to be low and the temperature at the outlet to be high, especially the temperature in the gap area of ​​the lithium battery is high, and the temperature consistency of the lithium battery pack is poor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a lithium battery immersion cooling box based on a swirl jet coherent nozzle. By designing different jet pipes, each jet pipe is staggered on the top of the battery box, and the outlet of the swirl jet nozzle is aligned with the battery module. Different jet pipes are selected according to the charge and discharge rate. In this way, the phase change latent heat of the fluorinated liquid can be used to take away the heat generated by the battery during the charge and discharge process. Compared with the traditional cooling method, the heat dissipation efficiency is high, which can not only limit the maximum temperature of the battery pack at high temperature, but also accurately control the battery pack temperature near the boiling point of the fluorinated liquid, greatly improving the thermal safety of the lithium battery pack during the charge and discharge process. In addition, the use of fluorinated liquid has good flame retardancy, which can effectively suppress thermal runaway behaviors such as fire and explosion of the battery under extreme working conditions (battery extrusion deformation, overheating, thermal runaway, etc.).

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A lithium battery immersion cooling box based on a swirl jet coherent nozzle, comprising a battery box, a pumping system and a jet pipeline;

[0007] A battery module is placed at the bottom of the battery box, an inlet and an outlet are provided on the side wall of the battery box, and a pumping system for conveying fluorinated liquid is provided at the inlet and the outlet; the jet pipes are staggered and distributed on the top of the battery box, and a plurality of swirl jet nozzles are provided on the jet pipes, and the outlets of the swirl jet nozzles are aimed at the battery module; the jet pipe is connected to the inlet, and an electromagnetic valve is provided on the jet pipe to divide the jet pipe into an A jet pipe and a B jet pipe; the injection area of ​​the A jet pipe is not less than the injection area of ​​the B jet pipe; according to the size of the charge and discharge rate, the electromagnetic valve is selectively controlled to be on and off, so as to make the A jet pipe work or the A jet pipe and the B jet pipe work together.

[0008] Furthermore, the battery module includes a plurality of lithium batteries, which are evenly distributed at the bottom of the battery box. The bottom of the battery box is provided with bosses corresponding to the lithium batteries one by one. Each lithium battery is placed on the boss, and the battery module is partially or completely immersed in the fluoride liquid through a pumping system.

[0009] Furthermore, a plurality of cylindrical lithium batteries are arranged in a rectangular array in the battery box, and the outlet of the swirl jet nozzle is aligned with the gaps between four adjacent lithium batteries.

[0010] Furthermore, the A jet pipeline includes a first main road and a first branch road, the first main road is connected to the inlet, a plurality of first branches are arranged at intervals on the first main road, and one end of the first branch road is connected to the B jet pipeline through a solenoid valve; a plurality of swirl jet nozzles are respectively arranged on the first main road and the first branch road.

[0011] Furthermore, the B jet pipeline includes a second main road and a second branch road, the second main road is connected to the solenoid valve, a plurality of second branches are arranged at intervals on the second main road, and any second branch is located between adjacent first branches; a plurality of swirl jet nozzles are respectively arranged on the second main road and the second branch road.

[0012] Furthermore, the swirl jet nozzle includes a front section and a tapered section, the inner wall of the tapered section is provided with a plurality of spiral flow channels, the flow channel in the inner cavity of the front section is a plum blossom flow channel, and the plum blossom flow channel is composed of a plurality of semi-cylindrical flow channels evenly distributed on the outside of the cylindrical flow channel, and each semi-cylinder is connected to a spiral flow channel.

[0013] Further, a first swirl jet nozzle is installed on the A jet pipe, and the swirl number of the first swirl jet nozzle is 0.7 - 1.2; a second swirl jet nozzle is installed on the B jet pipe, and the swirl number of the second swirl jet nozzle is greater than or equal to 1.2; wherein: the swirl number is the ratio of the tangential velocity to the axial velocity of the fluid.

[0014] Further, a temperature sensor is provided at the bottom of the battery box for detecting the temperature at the bottom of the battery module; a flow valve is provided at the inlet, and the control system controls the opening and closing of the pumping system for transporting the fluorinated liquid and adjusts the opening of the flow valve according to the temperature detected by the temperature sensor.

[0015] Further, the control system determines the charge-discharge rate according to the charge-discharge parameters of the battery module;

[0016] When the charge-discharge rate is less than 3C, the solenoid valve is selectively controlled to close to make the A jet pipe work;

[0017] When the charge-discharge rate is greater than or equal to 3C, the solenoid valve is selectively controlled to open to make the A jet pipe and the B jet pipe work together;

[0018] Wherein, the charge-discharge rate is the ratio of the electric quantity released or increased per unit time to the rated capacity of the battery.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. For the lithium battery immersion cooling box body based on the swirl jet coherent nozzle of the present invention, by designing different jet pipes, each jet pipe is staggeredly distributed on the top of the battery box, the outlet of the swirl jet nozzle is aligned with the battery module, and according to the size of the charge-discharge rate, the solenoid valve is selectively controlled to be turned on and off to make the A jet pipe work or the A jet pipe and the B jet pipe work together. The present invention can spray the fluorinated liquid in different pipelines according to the actual working requirements, and can meet the use requirements of different working conditions of the battery pack.

[0021] 2. The lithium battery immersion cooling box based on the swirl jet coherent nozzle of the present invention, the outlet of the swirl jet nozzle is aligned with the gap between 4 adjacent lithium batteries. The 4 adjacent lithium batteries can be regarded as a group of battery units, sharing a common gap in the middle. The temperature in the gap is relatively high. By evenly spraying an equal amount of fluorinated liquid onto the gap with a higher temperature, the fluorinated liquid with a higher thermal conductivity directly contacts the battery to take away heat, greatly reducing the temperature between the battery gaps compared with air cooling. At the same time, through the multi-pipeline design, the fluorinated liquid is evenly transported to each part of the battery pack. When the fluorinated liquid swirl jet coherent nozzle distributed above the battery pack sprays, it will use the entrainment effect of the jet to generate a significant shear layer, and then form a long stripe structure penetrating the entire shear layer, thereby increasing the spraying surface of the fluorinated liquid. The fluorinated liquid will form a counterflow phenomenon and diffuse to the surface of the nearby battery units, so that each battery unit can fully conduct convective heat transfer with the fluorinated liquid, solving the problem of large temperature differences between the battery units and battery gaps in the battery pack, improving the overall temperature consistency of the battery pack, and at the same time significantly improving the cooling effect of the battery pack.

[0022] 3. The lithium battery immersion cooling box based on the swirl jet coherent nozzle of the present invention, the bottom of the battery box is provided with bosses corresponding to the lithium batteries one by one. Each lithium battery is placed on the boss, and placing the lithium battery on the boss separates the bottom of the battery from the bottom of the battery box. In this way, the lithium battery pack can be completely immersed in the fluorinated liquid, which helps all surfaces of the single battery to fully exchange heat with the fluorinated liquid, and controls the temperature rise and temperature consistency during the charging and discharging process of the battery pack. A temperature sensor is installed in the middle of the boss. When each single battery is placed on the boss, the bottom of the battery monomer is in good contact with the temperature sensor, which can monitor the battery temperature change in real time, form a feedback with the flow valve and the three-way solenoid valve on the liquid inlet pipe, and cool the battery pack by adjusting the flow valve to obtain the optimal fluorinated liquid circulation flow and the optimal nozzle opening scheme, greatly improving the heat dissipation efficiency of the fluorinated liquid and reducing the power of the entire circulation pump.

[0023] 4. The lithium battery immersion cooling box based on the swirl jet coherent nozzle of the present invention, by distributing the jet pipe and the swirl jet nozzle at the upper end of the battery module, the jet pipe and the nozzle can be taken out arbitrarily by opening the upper cover of the battery box, and the battery units in any battery module can be taken out, which greatly facilitates the replacement and placement of the battery units in daily maintenance.

[0024] 5. The lithium battery immersion cooling box based on the swirl jet coherent nozzle of the present invention uses the phase change latent heat of the fluorinated liquid to take away the heat generated by the battery during the charging and discharging process. Compared with the traditional cooling method, the heat dissipation efficiency is high, which can not only limit the maximum temperature of the battery pack at high temperature, but also accurately control the battery pack temperature near the boiling point of the fluorinated liquid, greatly improving the thermal safety of the lithium battery pack during the charging and discharging process. In addition, the use of fluorinated liquid has good flame retardancy, which can effectively suppress the thermal runaway behavior of the battery such as fire and explosion under extreme working conditions (battery extrusion deformation, overheating, thermal runaway, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is an exploded view of the lithium battery immersion cooling box based on the swirl jet coherent nozzle described in the present invention.

[0027] Figure 2 A three-dimensional diagram of the battery box described in the present invention.

[0028] Figure 3 It is a three-dimensional diagram of the swirl jet nozzle described in the present invention.

[0029] Figure 4 This is a three-dimensional diagram of the A jet pipeline described in the present invention.

[0030] Figure 5 This is a three-dimensional diagram of the A jet pipeline and the B jet pipeline described in the present invention.

[0031] In the figure:

[0032] 1-end cover; 2-A jet pipe; 3-B jet pipe; 4-swirl jet nozzle; 41-front section; 411-semi-cylinder; 42-tapered section; 5-lithium battery; 6-battery box; 7-inlet; 8-outlet; 9-boss; 10-first main road; 11-first branch road; 12-second main road; 13-second branch road; 14-solenoid valve. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Such as Figure 1As shown, the lithium battery immersion cooling box based on the swirl jet coherent nozzle of the present invention comprises a battery box 6, a pumping system and a jet pipe; a battery module is placed at the bottom of the battery box 6, an end cover 1 is installed at the upper end of the battery box 6, an inlet 7 and an outlet 8 are arranged on the side wall of the battery box 6, and the inlet 7 and the outlet 8 are provided with a pumping system for conveying fluorinated liquid; the jet pipes are staggered on the top of the battery box 6, a plurality of swirl jet nozzles 4 are arranged on the jet pipes, and the outlets of the swirl jet nozzles 4 are aligned with the battery module; the jet pipe is connected to the inlet 7, and a solenoid valve 14 is arranged on the jet pipe, which is used to divide the jet pipe into an A jet pipe 2 and a B jet pipe 3; the injection area of ​​the A jet pipe 2 is not less than the injection area of ​​the B jet pipe 3; according to the size of the charge and discharge rate, the solenoid valve 14 is selectively controlled to be on and off, so as to make the A jet pipe 2 work or the A jet pipe 2 and the B jet pipe 3 work together. The present invention can spray fluorinated liquid in different pipelines according to actual working requirements, and can meet the use requirements of different working conditions of the battery pack. The present invention uses the phase change latent heat of the fluorinated liquid to carry away the heat generated by the battery during the charging and discharging process. Compared with the traditional cooling method, the heat dissipation efficiency is high. It can not only limit the maximum temperature of the battery pack at high temperature, but also accurately control the temperature of the battery pack near the boiling point of the fluorinated liquid, greatly improving the thermal safety of the lithium battery pack during the charging and discharging process. In addition, the use of fluorinated liquid has good flame retardancy, and can effectively suppress thermal runaway behaviors such as fire and explosion of the battery under extreme working conditions (battery extrusion deformation, overheating, thermal runaway, etc.).

[0037] like Figure 2As shown in the figure, the battery module includes a number of lithium batteries 5, which are evenly distributed at the bottom of the battery box 6. There are bosses 9 corresponding to the lithium batteries 5 one by one at the bottom of the battery box 6. Each lithium battery 5 is placed on the boss 9, and the battery module is partially or completely immersed in the fluorinated liquid through a pumping system. A temperature sensor is provided near the boss 9 to measure the temperature of the lithium battery 5. A number of cylindrical lithium batteries 5 are arranged in a rectangular array in the battery box 6, and the outlet of the swirl jet nozzle 4 is aligned with the gap between 4 adjacent lithium batteries 5. 4 adjacent lithium batteries 5 can be regarded as a group of battery units, sharing a gap in the middle, and the temperature in the gap is relatively high. The fluorinated liquid is evenly and equally sprayed onto the gap with a higher temperature, so that the fluorinated liquid with a higher thermal conductivity directly contacts the battery to take away heat, greatly reducing the temperature between the battery gaps compared with air cooling. At the same time, through the multi-pipeline design, the fluorinated liquid is evenly transmitted to each part of the battery pack. When the fluorinated liquid swirl jet coherent nozzles distributed above the battery pack spray, the entrainment effect of the jet will be used to generate a significant shear layer, and then a long stripe structure running through the entire shear layer will be formed, thereby increasing the spraying surface of the fluorinated liquid. The fluorinated liquid will form a counterflow phenomenon and diffuse to the surface of the nearby battery units, so that each battery unit can fully convect and exchange heat with the fluorinated liquid, solving the problem of large temperature differences between the individual battery units and battery gaps in the battery pack, improving the overall temperature uniformity of the battery pack, and at the same time significantly improving the cooling effect of the battery pack. In the embodiment, the lithium batteries 5 are arranged in the battery box 6 in a layout of 5 rows and 10 columns, and the distance between each lithium battery 5 is 2 mm.

[0038] As Figure 4 and Figure 5 shown, the A jet pipe 2 includes a first main road 10 and a first branch road 11. The first main road 10 is connected to the inlet 7, and a number of first branch roads 11 are arranged at intervals on the first main road 10. The end of one of the first branch roads 11 is connected to the B jet pipe 3 through a solenoid valve 14; a number of swirl jet nozzles 4 are respectively provided on the first main road 10 and the first branch road 11. The B jet pipe 3 includes a second main road 12 and a second branch road 13. The second main road 12 is connected to the solenoid valve 14, and a number of second branch roads 13 are arranged at intervals on the second main road 12, and any one of the second branch roads 13 is located between adjacent first branch roads 11; a number of swirl jet nozzles 4 are respectively provided on the second main road 12 and the second branch road 13. In the embodiment, there are 5 first branch roads 11 on the first main road 10, 4 second branch roads 13 on the second main road 12, and the second branch road 13 is between two first branch roads 11.

[0039] As Figure 3As shown, the swirling jet nozzle 4 includes a front section 41 and a tapered section 42. The inner wall surface of the tapered section 42 is provided with a plurality of spiral flow channels. The flow channel in the inner cavity of the front section 41 is a plum blossom flow channel. In the figure, it can be considered that the cross-section of the inner cavity of the front section 41 is similar to the shape of a plum blossom. The plum blossom flow channel is composed of a plurality of semi-cylindrical 411 flow channels evenly distributed on the outer side of the cylindrical flow channel. Each semi-cylindrical 411 is connected to a spiral flow channel. The cylindrical flow channel can produce the effect of concentrated axial jet, and the semi-cylindrical 411 flow channel and the spiral flow channel can produce swirl. The swirling jet ejected by the swirling jet nozzle 4 can introduce angular momentum into the concentrated axial flow to form shear flow. When the swirl is weak and the frequency is close to 0, the external structure of the jet will use the entrainment effect of the jet to generate a significant shear layer, and then form a long stripe structure that penetrates the entire shear layer, forcing the cold and hot fluorinated liquid to mix, thereby effectively reducing the temperature of the battery pack and improving the consistency of the overall temperature of the battery pack.

[0040] In the embodiment, a first swirling jet nozzle is installed on the A jet pipe 2, and the swirl number of the first swirling jet nozzle is 0.7 - 1.2; a second swirling jet nozzle is installed on the B jet pipe 3, and the swirl number of the second swirling jet nozzle is greater than or equal to 1.2; wherein: the swirl number is the ratio of the tangential velocity to the axial velocity of the fluid.

[0041] A temperature sensor is provided at the bottom of the battery box 6 for detecting the temperature at the bottom of the battery module; a flow valve is provided at the inlet 7, and the control system controls the opening and closing of the pumping system for transporting the fluorinated liquid and adjusts the opening of the flow valve according to the temperature detected by the temperature sensor.

[0042] The control system determines the charge and discharge rate according to the charge and discharge parameters of the battery module; when the charge and discharge rate is less than 3C, the solenoid valve 14 is selectively controlled to close to make the A jet pipe 2 work; when the charge and discharge rate is greater than or equal to 3C, the solenoid valve 14 is selectively controlled to open to make the A jet pipe 2 and the B jet pipe 3 work together; wherein, the charge and discharge rate is the ratio of the electric quantity released or increased per unit time to the rated capacity of the battery, usually represented by C. That is, at low-rate charge and discharge, a swirling jet nozzle with a swirl number of 0.7 - 1.2 is used, and at high-rate charge and discharge, a swirling jet nozzle with a swirl number of 0.7 - 1.2 and a swirling jet nozzle with a swirl number greater than or equal to 1.2 are used in combination, which can enhance heat transfer.

[0043] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0044] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. A lithium battery immersion cooling box based on a swirl jet coherent nozzle, characterized in that: It includes a battery box (6), a pumping system and a jet pipeline; A battery module is placed at the bottom of the battery box (6); an inlet (7) and an outlet (8) are provided on the side wall of the battery box (6); and a pumping system for conveying fluorinated liquid is provided at the inlet (7) and the outlet (8); the jet pipes are staggered and distributed at the top of the battery box (6); a plurality of swirl jet nozzles (4) are provided on the jet pipes; and the outlets of the swirl jet nozzles (4) are aligned with the battery module; the jet pipe is connected to the inlet (7); and a solenoid valve (14) is provided on the jet pipe for dividing the jet pipe into an A jet pipe (2) and a B jet pipe (3); the spraying area of ​​the A jet pipe (2) is not less than the spraying area of ​​the B jet pipe (3); and the solenoid valve (14) is selectively controlled to be on and off according to the charge and discharge ratio, so as to make the A jet pipe (2) work or the A jet pipe (2) and the B jet pipe (3) work together.

2. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: The battery module comprises a plurality of lithium batteries (5), the plurality of lithium batteries (5) being evenly distributed at the bottom of a battery box (6), the bottom of the battery box (6) being provided with bosses (9) corresponding one to one with the lithium batteries (5), each lithium battery (5) being placed on the bosses (9), and the battery module being partially or completely immersed in the fluoride liquid through a pumping system.

3. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 2 is characterized in that: A plurality of cylindrical lithium batteries (5) are arranged in a rectangular array in a battery box (6), and the outlet of the swirl jet nozzle (4) is aligned with the gaps between four adjacent lithium batteries (5).

4. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: The A jet pipeline (2) comprises a first main road (10) and a first branch road (11); the first main road (10) is connected to the inlet (7); a plurality of first branches (11) are arranged at intervals on the first main road (10); a terminal end of one of the first branches (11) is connected to the B jet pipeline (3) via a solenoid valve (14); and a plurality of swirl jet nozzles (4) are respectively arranged on the first main road (10) and the first branch road (11).

5. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 4 is characterized in that: The B jet pipeline (3) comprises a second main road (12) and a second branch road (13); the second main road (12) is connected to a solenoid valve (14); a plurality of second branches (13) are arranged at intervals on the second main road (12), and any second branch road (13) is located between adjacent first branches (11); and a plurality of swirl jet nozzles (4) are respectively arranged on the second main road (12) and the second branch road (13).

6. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: The swirl jet nozzle (4) comprises a front section (41) and a tapered section (42); the inner wall surface of the tapered section (42) is provided with a plurality of spiral flow channels; the flow channel in the inner cavity of the front section (41) is a plum blossom flow channel; the plum blossom flow channel is composed of a plurality of semi-cylindrical (411) flow channels evenly distributed on the outer side of a cylindrical flow channel; each semi-cylinder (411) is connected to a spiral flow channel.

7. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: A first swirl jet nozzle is installed on the A jet pipe (2), and the swirl number of the first swirl jet nozzle is 0.7-1.2; a second swirl jet nozzle is installed on the B jet pipe (3), and the swirl number of the second swirl jet nozzle is greater than or equal to 1.2; wherein: the swirl number is the ratio of the tangential velocity to the axial velocity of the fluid.

8. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: The bottom of the battery box (6) is provided with a temperature sensor for detecting the temperature of the bottom of the battery module; the inlet (7) is provided with a flow valve, and the control system controls the opening and closing of the pumping system for conveying the fluorinated liquid and adjusts the opening of the flow valve according to the temperature detected by the temperature sensor.

9. The lithium battery immersion cooling box based on the swirl jet coherent nozzle according to claim 1 is characterized in that: The control system determines the charge and discharge rate according to the charge and discharge parameters of the battery module; When the charge / discharge rate is less than 3C, the solenoid valve (14) is selectively controlled to be closed, so that the A jet pipe (2) works; When the charge / discharge rate is greater than or equal to 3C, the solenoid valve (14) is selectively controlled to open, so that the A jet pipe (2) and the B jet pipe (3) work together; Among them, the charge and discharge rate is the ratio of the amount of electricity released or increased per unit time to the rated capacity of the battery.

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