Cooling working medium radial washing type cylindrical battery immersed heat management module

Abstract

The invention relates to a cooling working medium radial washing type cylindrical battery immersion type heat management module, and belongs to the technical field of liquid cooling structures, the cooling working medium radial washing type cylindrical battery immersion type heat management module comprises a battery box, a plurality of uniformly arranged cylindrical batteries vertically arranged in the battery box and a cooling working medium drainage system, the cooling working medium in the slender pipe is output into a plurality of flow beams through the slender pipe, each cylindrical battery corresponds to the flow beams which are distributed in the vertical direction, the distribution density of the flow beams is gradually increased from bottom to top, and each flow beam scours to the outer wall of the corresponding cylindrical battery in the radial direction of the corresponding cylindrical battery. According to the invention, the highest temperature and the maximum temperature difference of the cylindrical battery can be obviously reduced, and meanwhile, the local heat dissipation of the tab part on the battery with high heat production rate is enhanced, so that the temperature field of the battery module including the battery tab is highly homogenized.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid cooling structures, and in particular relates to a cooling medium radial flushing type cylindrical battery immersion type thermal management module. Background Art

[0002] Battery thermal management technologies include air cooling technology, liquid cooling technology, phase change material cooling technology, heat pipe cooling technology and a combination of the above cooling technologies. Among them, liquid cooling technology has the advantages of high heat transfer efficiency, fast cooling speed and compact structure. Liquid cooling technology can be divided into direct cooling technology and indirect cooling technology according to the contact method between the coolant and the battery. Among them, since the coolant of the immersion cooling technology is in direct contact with the battery and there is no contact thermal resistance, the immersion battery thermal management system has a higher heat transfer efficiency. Immersion cooling technology is divided into series cooling and parallel cooling according to the coolant flow channels. Among them, in the parallel cooling flow channels, the coolant will be diverted in advance before entering different flow channels, and then enter the cavity separately, which makes the heat dissipation more efficient, but the flow channel system is complex. Under the same medium cooling method, the cooling effect of parallel cooling is better than that of series cooling.

[0003] Large cylindrical batteries increase the energy density and charge and discharge rate of batteries. At the same time, as the battery size increases, the number of batteries required for the battery pack will also decrease, and a smaller number can also reduce the difficulty of battery management. Therefore, large cylindrical batteries have broad application prospects in the fields of electric vehicles and electrochemical energy storage. Since large cylindrical batteries will have a large circumferential gap when arranged in groups, how to reasonably use this gap to arrange battery thermal management system components and take into account the improvement of the energy density of the battery module and the performance of the battery thermal management system has become a very valuable exploration direction.

[0004] Conventional series flow immersion battery thermal management system, such as the conventional series flow immersion battery thermal management system described in the literature Numerical study on heat dissipation performance of a lithium-ion battery module based on immersion cooling (Journal of Energy Storage, 66 (2023) 107511, https: / / doi.org / 10.1016 / j.est.2023.107511), such as Figure 1As shown, multiple battery cells are completely immersed in the liquid contained in the battery shell, and the cooling medium enters the box body from the inlet of one side wall of the box body and flows out of the box body from the outlet of the other side wall. The medium flows through each battery cell in a serial flow in the box body. Although this method utilizes the convection heat exchange between the medium and the battery side wall to improve the heat transfer coefficient, there is a large temperature difference between the upstream and downstream mediums, and the degree of cooling of battery cells at different positions is different, which will inevitably lead to inconsistent battery cell temperature ranges and a large battery temperature difference; at the same time, the coolant does not flow sufficiently between the battery cells, and the convection heat exchange area with the battery cells in some areas is small, which is not conducive to the improvement of the overall heat transfer coefficient, and the reduction of the maximum temperature of the battery is limited. Figure 1 It is a conventional series-flow immersion battery thermal management system.

[0005] In addition, the baffle-baffled immersion battery thermal management system described in the document Channel structure design and optimization for immersion cooling system of lithium-ion batteries (Journal of Energy Storage 2024) (Journal of Energy Storage, 77 (2024) 109930, https: / / doi.org / 10.1016 / j.est.2023.109930) sets baffles in the channel through which the working fluid flows. The optimal baffle setting method obtained by the study is as follows: Figure 2 As shown, the height of the upper vertical partition and the lower vertical partition are both 34 mm and the thickness is 1 mm. This structural design can simplify the structure of the battery thermal management system as much as possible without affecting the compactness of the battery. Such a baffle structure design can disrupt the flow path of the coolant, while increasing the degree of turbulence, enhancing heat transfer and improving temperature uniformity. However, in local areas of the battery, there may still be local battery surface areas where there is no direct flushing flow of the heat dissipating medium, resulting in the temperature of the local area of ​​the battery not being adjusted in time, affecting the reduction of evaluation indicators such as the maximum temperature and maximum temperature difference of the entire immersion thermal management system.

[0006] Moreover, the battery's tabs are the main factor affecting the uneven temperature distribution and local excessive temperature of this type of battery. During the battery discharge process, the electrochemical reaction rate and heat generation rate in the area close to the tab end are both high, and this unevenness becomes more significant as the discharge rate increases. Especially under high current charging and discharging, there is an uneven distribution of physical and chemical properties inside the battery, especially at the connection between the tab and the battery cell, which easily forms a large gradient distribution of potential, current density and heat generation rate. The existing immersion battery thermal management system can achieve simultaneous heat dissipation of the battery body and its tabs, but has not given special attention to the heat dissipation of the tabs where the local temperature is higher. Summary of the invention

[0007] The purpose of the present invention is to provide a cooling medium radial flushing cylindrical battery immersion thermal management module in order to solve the above-mentioned problems.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0009] The present invention provides a cooling medium radial flushing type cylindrical battery immersion thermal management module, comprising a battery box, a plurality of evenly arranged cylindrical batteries vertically arranged in the battery box, and a cooling medium drainage system, wherein slender tubes are vertically arranged in the gaps between adjacent cylindrical batteries, and the slender tubes output the cooling medium in the tubes as a plurality of flow beams, each cylindrical battery corresponds to a plurality of flow beams distributed vertically and with increasing distribution density from bottom to top, and each flow beam is flushed radially along the corresponding cylindrical battery to the outer wall of the cylindrical battery.

[0010] As a further optimization scheme of the present invention, a horizontal narrow opening for outputting the flow beam is opened in the tube wall of the slender tube, and a spacing is provided between two upper and lower adjacent horizontal narrow openings, and the spacing gradually decreases from bottom to top.

[0011] As a further optimization scheme of the present invention, the reduction ratio of the upper and lower spacing between the horizontal narrow openings is 1.01-1.1.

[0012] As a further optimization solution of the present invention, the cross section of the elongated tube is circular or polygonal.

[0013] As a further optimization solution of the present invention, the side lines of the polygon are identical straight lines or concave arcs.

[0014] As a further optimization solution of the present invention, the number of the side lines of the polygon is consistent with the number of the cylindrical batteries outside the slender tube, and each side line is directly opposite to the corresponding cylindrical battery.

[0015] As a further optimization scheme of the present invention, a plurality of ejection outlets corresponding to the horizontal narrow openings are provided on the outer wall of the slender tube with a circular or regular polygonal cross section, and the ejection outlets are in a horizontally gradually expanding trumpet-shaped structure.

[0016] As a further optimization scheme of the present invention, the cooling medium drainage system includes an upper partition and a lower partition arranged in the battery box, and the upper partition cooperates with the lower partition to divide the inner cavity of the battery box into three parts: an upper cavity for cooling medium outflow, a middle cavity of the battery pack, and a lower cavity for cooling medium inflow. All cylindrical batteries and slender tubes are located in the middle cavity of the battery pack, the lower end face of the slender tube is an open end, and the upper end face is a closed end, and a lower through hole is opened in the lower partition that is one-to-one connected with the open end.

[0017] As a further optimization scheme of the present invention, the cylindrical battery includes an upper pole ear, and an upper through hole corresponding to the upper pole ear is opened on the upper partition, and the upper through hole is used to guide the cooling medium in the middle cavity of the battery pack to flow into the cooling medium through the upper pole ear and out of the upper cavity.

[0018] As a further optimization solution of the present invention, the radius of the upper through hole is greater than the radius of the upper tab, and a gap is provided between the upper separator and the upper surface of the cylindrical battery.

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

[0020] 1. In the present invention, by setting a slender tube for draining the cooling medium in the pores between adjacent cylindrical batteries, the cooling medium is guided to flow into the slender tube through the lower cavity, and then gushed out from the horizontal narrow opening on the slender tube, radially flushing the outer side of each cylindrical battery, and finally discharged from the upper end of the battery. This cooling medium drainage path allows the fresh cooling medium to be flushed along the radial direction of the cylindrical battery to the outer wall of the cylindrical battery after being ejected from the slender tubes in parallel. This flushing effect can significantly improve the convective heat transfer coefficient between the cooling medium and each cylindrical battery, and achieve the same degree of cooling for each battery, so that the battery temperature level can be greatly reduced, and a high level of battery temperature uniformity can be maintained;

[0021] 2. In the present invention, an ejection outlet with a gradually expanding trumpet-shaped structure is provided on the outer side wall of the horizontally narrow and long opening, so that the working fluid entering the narrow and long tube can directly flush the side walls of different heights of each battery at a similar initial test temperature, so that the different height areas of each battery can obtain a consistent impact heat dissipation effect, which is conducive to improving the temperature uniformity of different height areas of the same battery;

[0022] 3. In the present invention, on the one hand, the upper through hole for leading out the cooling medium in the middle cavity of the battery pack is arranged at a position on the upper partition corresponding to the upper pole ear of the cylindrical battery, and on the other hand, in the setting of the horizontal narrow openings, the spacing between the upper and lower adjacent horizontal narrow openings is designed to gradually decrease from bottom to top, which comprehensively realizes the enhancement of the flushing effect of the cooling medium on the upper pole ear and its electrical connection components, thereby improving the cooling efficiency of the battery surface in the area near the upper pole ear, and then can significantly improve the temperature uniformity of the entire battery module, and improve the thermal management performance of the entire immersed cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a conventional series flow type immersion battery thermal management system;

[0024] Figure 2 It is a baffle-baffled immersed battery thermal management system;

[0025] Figure 3 It is a system overall structure diagram of an embodiment of sequential arrangement of batteries of the present invention;

[0026] Figure 4 The present invention Figure 3 Medium AA view;

[0027] Figure 5 is a top view of a cavity in a battery pack of an embodiment of sequential arrangement of batteries of the present invention;

[0028] Figure 6 The present invention Figure 5 Middle BB view and its partial enlargement;

[0029] Figure 7 The schematic diagram of the battery sequential arrangement embodiment of the present invention is a three-dimensional structure of a circular elongated tube and its surrounding batteries;

[0030] Figure 8 It is a schematic diagram of a three-dimensional structure of a square elongated tube and surrounding batteries in a sequentially arranged embodiment of the present invention;

[0031] Fig. 9 The schematic diagram of the battery sequential arrangement embodiment of the present invention is a cross-section of a concave quadrilateral elongated tube three-dimensional structure and the batteries around it;

[0032] Fig.10 It is a schematic diagram of a three-dimensional structure of an elongated tube with an inner circular cross section and a horizontal narrow opening and a trumpet-shaped ejection outlet, and the batteries around it, in an embodiment of sequential arrangement of batteries of the present invention;

[0033] Fig.11 It is a schematic diagram of a three-dimensional structure of an elongated tube with a square cross section and a horizontal narrow opening and a trumpet-shaped ejection outlet, and the batteries around it, in an embodiment of sequential arrangement of batteries of the present invention;

[0034] Fig.12 is a top view of the cavity of a battery pack of an embodiment of staggered arrangement of batteries of the present invention;

[0035] Fig.13 The cross-section of the staggered arrangement of batteries in the present invention is an equilateral triangle elongated tube three-dimensional structure and a schematic diagram of the batteries around it;

[0036] Fig.14 The cross section of the staggered arrangement of batteries in the present invention is a three-dimensional structure of an inwardly concave equilateral triangle and elongated tubes and a schematic diagram of the batteries around it;

[0037] Fig.15 A schematic diagram of a three-dimensional structure of an elongated tube having an equilateral triangle cross section and a trumpet-shaped ejection outlet and batteries around it in an embodiment of staggered arrangement of batteries of the present invention;

[0038] Fig.16 It is a partial structural diagram of a cylindrical battery immersion thermal management module based on a highly gradient fin sleeve with application number 2024107979473;

[0039] Fig.17 This is a comparison chart of the maximum temperature and maximum temperature difference of the battery in the module under different structural schemes at the end of discharge at a 3x discharge rate;

[0040] Fig.18 This is a comparison of the temperature cloud diagrams of the batteries in the module under different structural schemes at the end of discharge at a 3x discharge rate.

[0041] In the figure: 1. battery box; 11. upper partition; 11a. upper through hole; 12. lower partition; 12a. lower through hole; 13. outflow from upper cavity; 13a. working fluid outlet; 14. battery pack middle cavity; 15. inflow into lower cavity; 15a. working fluid inlet; 2. cylindrical battery; 21. upper pole ear; 3. slender tube; 31. open end; 32. closed end; 33. horizontal narrow opening; 34. ejection outlet; 41. upper vertical partition; 42. lower vertical partition; 51. heat dissipation sleeve; 52. height gradient fin. DETAILED DESCRIPTION

[0042] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0043] Example 1

[0044] A cooling medium radial flushing cylindrical battery immersion thermal management module comprises a battery box 1, a plurality of evenly arranged cylindrical batteries 2 vertically arranged in the battery box 1, and a cooling medium drainage system, wherein slender tubes 3 are vertically arranged in the gaps between adjacent cylindrical batteries 2, and the slender tubes 3 output the cooling medium in the tubes as a plurality of streams, each cylindrical battery 2 corresponds to a plurality of streams distributed vertically and with increasing distribution density from bottom to top, and each stream is flushed along the radial direction of the corresponding cylindrical battery 2 to the outer wall of the cylindrical battery 2.

[0045] A horizontal narrow opening 33 for outputting a flow stream is provided in the wall of the elongated tube 3, and a spacing is provided between two adjacent horizontal narrow openings 33, the spacing gradually decreases from bottom to top, and the vertical spacing reduction ratio between the horizontal narrow openings 33 is 1.01-1.1, and the value in this embodiment is 1.05. Figure 5-11 shown.

[0046] The cylindrical batteries 2 are arranged in sequence, such as Figure 5 As shown, the cross section of the elongated tube 3 is any one of a circle, a regular quadrilateral, and an indented quadrilateral with four sides of equal length and uniform indentation, wherein each side of the regular quadrilateral and the indented quadrilateral is respectively opposite to the corresponding cylindrical battery 2, the number of the horizontal narrow openings 33 in the horizontal direction is four, and the four horizontal narrow openings 33 correspond one by one to the four cylindrical batteries 2 on the periphery of the elongated tube 3, as shown in FIG. Figure 7-9 As shown, the outer wall of the elongated tube 3 with a circular or regular quadrilateral cross section is provided with a plurality of ejection outlets 34 corresponding to the horizontal elongated openings 33 one by one, and the ejection outlets 34 are in a horizontal gradually expanding trumpet-shaped structure, such as Figure 10-11 As shown, the cooling medium rushes out through the horizontal narrow opening 33 and then flushes the outer surface of the cylindrical battery 2 in the radial direction.

[0047] The cooling medium drainage system includes an upper partition 11 and a lower partition 12 arranged in the battery box 1, and the upper partition 11 cooperates with the lower partition 12 to divide the inner cavity of the battery box 1 into three parts: an upper cavity 13 for cooling medium to flow out, a middle cavity 14 of the battery pack, and a lower cavity 15 for cooling medium to flow in. The battery box 1 is provided with a medium outlet 13a that matches with the cooling medium to flow out of the upper cavity 13 and a medium inlet 15a that matches with the cooling medium to flow into the lower cavity 15. All cylindrical batteries 2 and slender tubes 3 are located in the middle cavity 14 of the battery pack. The lower end face of the slender tube 3 is an open end 31 and the upper end face is a closed end 32. The lower partition 12 is provided with a lower through hole 12a that is one-to-one connected with the open end 31. Figure 3 , 4 shown.

[0048] The cylindrical battery 2 includes an upper pole ear 21. The upper separator 11 is provided with an upper through hole 11a corresponding to the upper pole ear 21. The upper through hole 11a is used to guide the cooling medium in the battery pack cavity 14 to flow into the cooling medium and out of the upper cavity 13 through the upper pole ear 21. Figure 6 shown.

[0049] The radius of the upper through hole 11a is greater than the radius of the upper pole ear 21, and the radius difference is 2-6mm, and the value in this example is 2mm. There is a spacing of 2-5mm between the upper separator 11 and the upper surface of the cylindrical battery 2, and the value in this example is 2mm.

[0050] Example 2

[0051] Different from the first embodiment, in this embodiment, the cylindrical batteries 2 are arranged in a staggered manner, such as Fig.12 As shown, the cross section of the elongated tube 3 is any one of a circle, a regular triangle, and an indented triangle with three sides of equal length and uniform indentation, wherein each side of the regular triangle and the indented triangle is respectively facing the corresponding cylindrical battery 2, the number of the horizontal narrow openings 33 in the horizontal direction is three, and the three horizontal narrow openings 33 correspond one to one to the three cylindrical batteries 2 on the periphery of the elongated tube 3, as shown in FIG. Fig.13 , 14 As shown, the outer wall of the elongated tube 3 with a circular or regular triangle cross section is provided with a plurality of ejection outlets 34 corresponding to the horizontal narrow openings 33 one by one, and the ejection outlets 34 are in a horizontal gradually expanding trumpet-shaped structure, such as Fig.15 As shown, the cooling medium rushes out through the horizontal narrow opening 33 and then flushes the outer surface of the cylindrical battery 2 in the radial direction.

[0052] During the working process of the cooling medium, the low-temperature liquid cooling medium enters the lower chamber 15 from the medium inlet 15a on one side of the battery box 1, enters the slender tube 3 through the lower through hole 12a, and gushes out from the horizontal narrow opening 33 on the slender tube 3, or is guided through the ejection outlet 34, radially flushes the outer side of each cylindrical battery 2 to enhance the heat dissipation effect, and flows upward through the gap between the upper surface of the cylindrical battery 2 and the upper partition 11, and the gap between the upper through hole 11a and the upper pole ear 21, to achieve flushing and heat dissipation of the upper pole ear 21 and the battery pack electrical connection components. Then, the cooling medium that enters and flows out of the upper chamber 13 is discharged from the medium outlet 13a, thereby carrying and discharging the heat of the battery pack.

[0053] verify:

[0054] In order to compare the superiority of the battery thermal management system of the present invention, four structural schemes are set in this experimental example:

[0055] (1) Solution 1: Conventional serial flow immersion battery thermal management system, i.e., “Background Technology” document Numerical study on heat dissipation performance of a lithium-ion battery module based on immersion cooling (Journal of Energy Storage, 66 (2023) 107511,

[0056] https: / / doi.org / 10.1016 / j.est.2023.107511) scheme, such as Figure 1 As shown, the battery pack is composed of a battery box 1 and cylindrical batteries 2, and the battery pack is a staggered arrangement structure. A working fluid inlet 15a is opened at the bottom of one side wall of the battery box 1, and a working fluid outlet 13a is opened at the top of the other side wall. The working fluid enters the battery box 1 from the working fluid inlet 13a, flows through the cylindrical batteries 2 in series in sequence, achieving the effect of immersion cooling, and then flows out from the working fluid outlet 15a.

[0057] (2) Scheme 2: Baffle-baffled immersion battery thermal management system, i.e., the scheme in the “background technology” document Channel structure design and optimization for immersion cooling system of lithium-ion batteries (Journal of Energy Storage 2024) (Journal of Energy Storage, 77 (2024) 109930, https: / / doi.org / 10.1016 / j.est.2023.109930), such as Figure 2 As shown, the battery pack is a staggered arrangement structure. An upper vertical baffle 41 and a lower vertical baffle 42 are set in the working medium flow channel, each with a height of 34 mm and a thickness of 1 mm. The purpose of the baffle design is to disrupt the flow path of the coolant, increase the turbulence, enhance heat transfer and improve temperature uniformity.

[0058] (3) Scheme 3: A cylindrical battery immersion thermal management module based on a height gradient fin sleeve, that is, Scheme 6 in the embodiment of the invention patent with application number 2024107979473, the battery pack is a staggered arrangement structure, the working fluid flows in and out in a parallel flow manner, and the heat dissipation sleeve 51 and the height gradient fin 52 are installed on the battery. Immersion cooling system, such as Fig.16 shown.

[0059] (4) Solution 4: In the staggered arrangement structure of the battery pack of Example 2 of the present application, the cross-sectional shape of the slender tube 3 is a concave triangle with three sides of equal length and uniform concave.

[0060] The numerical simulation was carried out under the conditions of 3 times discharge rate, equal coolant inlet flow, same cylindrical battery heat generation, and considering the high heat dissipation effect of the battery ear. The calculation results are as follows: Fig.17 , 18 shown.

[0061] Fig.17 This is a comparison chart of the maximum temperature and maximum temperature difference of the battery in the module under different structural schemes at the end of discharge under the condition of 3 times discharge rate and starting temperature of 30℃; Fig.18 It is a comparison of the temperature cloud diagrams of the batteries in the module under different structural schemes at the end of discharge at a 3x discharge rate and a starting temperature of 30°C.

[0062] from Fig.17 It can be seen that at the end of discharge at a 3-fold discharge rate, the maximum temperature and the maximum temperature difference of Schemes 1 to 4 all show a decreasing trend, that is, the heat transfer coefficient of the immersion cooling gradually increases. Scheme 4, that is, the immersion cooling heat transfer coefficient of the design scheme of the present invention is relatively the largest, and its cooling speed for battery 2 is the fastest, and the corresponding maximum temperature of battery 2 reaches the lowest value.

[0063] Combination Fig.17 , 18 It can be seen that the temperature cloud maps of the batteries in the module under different structural schemes at the end of discharge at a 3-fold discharge rate are quite different. It can be seen from the maximum temperature of the battery pack marked in the upper left corner of each scheme and the minimum temperature of the battery pack marked in the lower right corner that Scheme 4 is the best scheme. Under this scheme, the maximum temperature of the battery at the end of discharge at a 3-fold discharge rate is 31.4°C, and the maximum temperature difference is 1.4°C. This further illustrates that a cylindrical battery immersion thermal management module with radial flushing of a cooling medium in the present application can significantly improve the cooling capacity of the coolant on the battery, so that the maximum temperature of the battery including the upper pole ear is further reduced, while significantly improving the temperature uniformity of the battery pack.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cooling medium radial flushing cylindrical battery immersion thermal management module, comprising a battery box (1), a plurality of evenly arranged cylindrical batteries (2) vertically arranged in the battery box (1), and a cooling medium drainage system, characterized in that: Slender tubes (3) are vertically arranged in the gaps between adjacent cylindrical batteries (2), and the slender tubes (3) output the cooling medium in the tubes as a plurality of streams, each of the cylindrical batteries (2) corresponds to a plurality of streams distributed vertically and with increasing density from bottom to top, and each stream is flushed along the radial direction of the corresponding cylindrical battery (2) to the outer wall of the cylindrical battery (2).

2. According to claim 1, a cooling medium radial flushing cylindrical battery immersion thermal management module is characterized in that: A horizontal narrow opening (33) for outputting a flow stream is provided in the wall of the slender tube (3), and a spacing is provided between two upper and lower adjacent horizontal narrow openings (33), and the spacing gradually decreases from bottom to top.

3. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 2 is characterized in that: The reduction ratio of the upper and lower spacings between the horizontal narrow openings (33) is 1.01-1.

1.

4. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 1 is characterized in that: The cross section of the elongated tube (3) is circular or polygonal.

5. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 4 is characterized in that: The side lines of the polygon are identical straight lines or concave arcs.

6. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 5, characterized in that: The number of the polygonal side lines is consistent with the number of cylindrical batteries (2) outside the slender tube (3), and each side line is directly opposite to the corresponding cylindrical battery (2).

7. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 5, characterized in that: The outer wall of the elongated tube (3) with a circular or regular polygonal cross section is provided with a plurality of injection outlets (34) corresponding one to one with the horizontal elongated openings (33), and the injection outlets (34) are in a horizontally gradually expanding trumpet-shaped structure.

8. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 1 is characterized in that: The cooling medium drainage system comprises an upper partition (11) and a lower partition (12) arranged in the battery box (1), and the upper partition (11) cooperates with the lower partition (12) to divide the inner cavity of the battery box (1) into three parts: an upper cavity (13) for cooling medium to flow out, a middle cavity (14) for the battery pack, and a lower cavity (15) for cooling medium to flow in. All of the cylindrical batteries (2) and the slender tube (3) are located in the middle cavity (14) for the battery pack. The lower end surface of the slender tube (3) is an open end (31) and the upper end surface is a closed end (32). The lower partition (12) is provided with a lower through hole (12a) that is connected to the open end (31) one by one.

9. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 8, characterized in that: The cylindrical battery (2) comprises an upper pole ear (21), and the upper separator (11) is provided with upper through holes (11a) corresponding to the upper pole ears (21) one by one, and the upper through holes (11a) are used to guide the cooling medium in the battery pack cavity (14) to flow into the cooling medium through the upper pole ear (21) and out of the upper cavity (13).

10. The cooling medium radial flushing cylindrical battery immersion thermal management module according to claim 9, characterized in that: The radius of the upper through hole (11a) is greater than the radius of the upper electrode tab (21), and a gap is provided between the upper separator (11) and the upper surface of the cylindrical battery (2).

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