Immersion liquid-cooling tank and battery pack

Abstract

Provided in the present application are an immersion liquid-cooling tank and a battery pack. The immersion liquid-cooling tank comprises a tank body. The tank body is provided with an immersion cavity configured to place battery cells. The immersion cavity has a liquid inlet and a liquid outlet formed on the outer surface of the tank body. The liquid inlet and the liquid outlet are respectively located on two opposite sides along the width of the tank body.

Description

Submerged liquid cooling box and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202422322693.8 and No. 202411329224.7, filed on September 23, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a submerged liquid cooling box and a battery pack. BACKGROUND

[0003] In the technical field of batteries, cooling structures are often used to reduce the temperature of the battery cells in the battery module to ensure the safe use of the battery.

[0004] In related technologies, liquid cooling bottom plates can be used to regulate the temperature of the battery cells, and submerged liquid cooling can also be used to regulate the temperature of the battery cells. SUMMARY

[0005] For submerged liquid cooling, the immersion liquid usually flows into the immersion cavity from the bottom plate and flows out of the immersion cavity from the position close to the top plate. The liquid inlet and the liquid outlet are respectively located on opposite sides in the length direction of the box. As a result, the flow path of the immersion liquid is large, resulting in a large temperature difference between the battery cells located at the liquid inlet and the battery cells located at the liquid outlet.

[0006] The present application provides a submerged liquid cooling box. The submerged liquid cooling box includes a box body configured to place battery cells, the box body is configured with an immersion cavity configured to place battery cells, the immersion cavity is formed with a liquid inlet and a liquid outlet on the outer surface of the box body, and the liquid inlet and the liquid outlet are respectively located on opposite sides in the width direction of the box body.

[0007] The present application also provides a battery pack. The battery pack includes the above-mentioned submerged liquid cooling box. ADVANTAGEOUS EFFECTS

[0008] The submerged liquid cooling box provided by the present application can make the immersion liquid flow along the width direction of the box body by arranging the liquid inlet and the liquid outlet on opposite sides in the width direction of the box body, thereby shortening the flow path of the immersion liquid and reducing the temperature difference between the battery cells, thereby improving the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0009] FIG. 1 is a perspective view of the box body according to an embodiment of the present application.

[0010] FIG. 2 is a schematic view of the distribution of the battery cells according to an embodiment of the present application.

[0011] FIG. 3 is a cross-sectional view of the box body with battery cells placed therein according to an embodiment of the present application.

[0012] Fig. 4 is a cross-sectional view of the battery case without the battery cells according to an embodiment of the present application.

[0013] Fig. 5 is a flow line diagram of the immersion liquid in the immersion liquid cooling battery case according to an embodiment of the present application.

[0014] Fig. 6 is a flow line diagram of the immersion liquid in the immersion liquid cooling battery case according to an embodiment of the present application.

[0015] Fig. 7 is a flow line diagram of the immersion liquid in the immersion liquid cooling battery case according to an embodiment of the present application.

[0016] Legend of reference numerals:

[0017] 10, battery case; 110, immersion cavity; 120, liquid inlet; 130, liquid outlet; 20, liquid inlet pipeline; 210, liquid injection port; 220, liquid injection pipeline; 30, liquid outlet pipeline; 310, through hole; 320, liquid discharge pipeline; 40, mounting area; 410, mounting position; 50, flow guide channel; 510, first gap; 520, second gap; 60, battery cell; 70, flow guide area. Embodiment of the present application

[0018] Please refer to Figs. 1-7, the present application provides an immersion liquid cooling battery case. The immersion liquid cooling battery case comprises a battery case 10. The battery case 10 is configured with an immersion cavity 110 for placing battery cells 60. The immersion cavity 110 is formed with a liquid inlet 120 and a liquid outlet 130 on the outer surface of the battery case 10. The liquid inlet 120 and the liquid outlet 130 are respectively located on the opposite sides of the width direction of the battery case 10.

[0019] In the present application, by setting the liquid inlet 120 and the liquid outlet 130 on the opposite sides of the width direction of the battery case 10, the immersion liquid can flow along the width direction of the battery case 10, thereby shortening the flow path of the immersion liquid, reducing the temperature difference between the battery cells 60, and improving the service life of the battery.

[0020] It can be understood that the liquid inlet 120 is the inlet for the immersion liquid to flow into the immersion cavity 110, and the liquid outlet 130 is the outlet for the immersion liquid to flow into and out of the immersion cavity 110. The immersion liquid flows into the immersion cavity 110 from the liquid inlet 120 at a certain flow rate, and after contacting the battery cells 60, it can diverge in four directions of up, down, left and right, and continuously flow towards the liquid outlet 130 from the gap between the adjacent two battery cells 60. In this way, the flow path of the immersion liquid can be shortened, the temperature difference between the battery cells 60 can be reduced, and the temperature consistency between the battery cells 60 can be improved.

[0021] In some embodiments, the box 10 is provided in a cuboid shape. The box 10 has a length side, a width side and a height side. The width direction of the box 10 is the direction in which the width side of the box 10 extends. The length direction of the box 10 is the direction in which the length side of the box 10 extends. The height direction of the box 10 is the direction in which the height side of the box 10 extends.

[0022] Based on the box 10 being provided in a cuboid shape, the immersion cavity 110 can also be provided in a cuboid shape. When the immersion cavity 110 is in a cuboid shape, the square-shaped battery cell 60 can be placed in the immersion cavity 110. When the battery cell 60 is a cylindrical battery cell, the inner surface of the immersion cavity 110 can be provided with a circular arc surface, and the corresponding radius of the circular arc surface is adapted to the radius of the battery cell 60.

[0023] The upper surface of the box 10 can form an opening, so that the battery cell 60 can be installed into the immersion cavity 110 from the opening. The opening can be closed by a box cover, and the box cover and the box 10 can be sealed and connected by a sealing element to prevent the immersion liquid from overflowing from the opening of the box 10.

[0024] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located at the middle position in the height direction of the box 10.

[0025] It can be understood that by locating the liquid inlet 120 and the liquid outlet 130 at the middle position in the height direction of the box 10, the heights of the liquid inlet 120 and the liquid outlet 130 are consistent, so as to ensure that the immersion liquid has the shortest flow path. At the same time, by locating the liquid inlet 120 and the liquid outlet 130 at the corresponding positions in the height direction, the possibility of vortex of the immersion liquid can be reduced, the flow resistance can be reduced, and the heat exchange efficiency can be improved.

[0026] For example, as shown in FIG. 1, the height of the box 10 is H. The middle position in the height direction can be at the position of 1 / 2H. When the immersion liquid is injected into the immersion cavity 110 at a certain flow rate, after the immersion liquid contacts the battery cell 60, the immersion liquid can be dispersed in the upward, downward, leftward and rightward directions. Based on the liquid inlet 120 being located at the position of 1 / 2H, the flow paths of the immersion liquid dispersed in the upward and downward directions are the same, and the cooling effect of the upper region and the lower region of the battery cell 60 can be made substantially the same, so as to improve the temperature consistency of the battery cell 60. At the same time, by locating the liquid inlet 120 at the position of 1 / 2H, it can be ensured that the immersion liquid dispersed on the outer surface of the battery cell 60 can be dispersed to the top of the battery cell 60, so as to ensure that the top of the battery cell 60 can be cooled.

[0027] For example, the height of the box 10 is H. The middle position in the height direction can be at the position of 2 / 5H-3 / 5H. Regardless of which region the middle position in the height direction of the box 10 is located, it is only required that the liquid inlet 120 and the liquid outlet 130 are located at the same height.

[0028] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located at the middle position of the length direction of the box 10.

[0029] It can be understood that, by locating the liquid inlet 120 and the liquid outlet 130 at the middle position of the length direction of the box 10, the liquid inlet 120 and the liquid outlet 130 are aligned with each other in the length direction, so as to ensure that the immersion liquid has the shortest flow path. At the same time, after the liquid inlet 120 and the liquid outlet 130 are aligned in the length direction, the possibility of vortex of the immersion liquid can be reduced, the flow resistance can be reduced, and the heat exchange efficiency can be improved.

[0030] For example, as shown in FIG. 1, the length of the box 10 is L. The middle position of the length direction can be the position of 1 / 2L. When the immersion liquid is injected into the immersion cavity 110 at a certain flow rate, after the immersion liquid contacts the battery cell 60, the immersion liquid can be dispersed in the upward, downward, leftward and rightward directions. Based on the fact that the liquid inlet 120 is located at the position of 1 / 2L, the flow paths of the immersion liquid dispersed in the leftward and rightward directions are the same, and the cooling effect of the left and right regions of the battery cell 60 can be made substantially the same, so as to improve the temperature consistency of the battery cell 60.

[0031] For example, the length of the box 10 is L. The middle position of the length direction can be 2 / 5L-3 / 5L. Regardless of which region of the middle position of the length direction of the box 10, as long as the liquid inlet 120 and the liquid outlet 130 are aligned in the length direction.

[0032] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located at the middle position of the height direction of the box 10, and the liquid inlet 120 and the liquid outlet 130 are both located at the middle position of the length direction of the box 10. In this way, the liquid inlet 120 and the liquid outlet 130 can be aligned in the XY plane formed by the height direction and the length direction, so as to ensure that the immersion liquid has the shortest flow path. At the same time, the possibility of vortex of the immersion liquid can be reduced, the flow resistance can be reduced, and the heat exchange efficiency can be improved.

[0033] In some embodiments, the liquid inlet 120 is configured to inject the immersion liquid into the immersion cavity 110. The flow rate of the immersion liquid at the liquid inlet 120 is Q. It is satisfied that 8 L / min≤Q≤20 L / min (liters per minute).

[0034] It can be understood that the flow rate of the immersion liquid at the liquid inlet 120 is limited to 8 L / min to 20 L / min, so that the immersion liquid can spread above and below the battery cell 60 after impacting the battery cell 60. The immersion liquid spreading above the battery cell 60 can flow in the width direction above the battery cell 60, thereby liquid-cooling the upper region of the battery cell 60. The immersion liquid spreading below the battery cell 60 can flow in the width direction below the battery cell 60, thereby liquid-cooling the lower region of the battery cell 60. If the flow rate of the immersion liquid at the liquid inlet 120 is less than 8 L / min, the immersion liquid may not reach above the battery cell 60 after impacting the battery cell 60, resulting in poor cooling effect on the upper region of the battery cell 60. If the flow rate of the immersion liquid at the liquid inlet 120 is greater than 20 L / min, the impact force of the immersion liquid on the battery cell 60 will be greater, which may cause damage to the battery cell 60.

[0035] For example, the flow rate of the immersion liquid at the liquid inlet 120 is set to 8 L / min, 12 L / min, 16 L / min, 20 L / min, or any value between any two of them.

[0036] As shown in FIGS. 5 to 7, the color gradient distribution in the figures represents the flow rate of the immersion liquid, with a unit of m / s (meter per second), and the red arrow represents the flow direction of the immersion liquid. Based on the selection of the flow rate of the immersion liquid at the liquid inlet 120, in combination with the pore size of the liquid inlet 120, the flow rate of the immersion liquid at the liquid inlet 120 can be about 1 m / s.

[0037] As shown in FIG. 3, in some embodiments, the cavity wall surface of the immersion cavity 110 is provided with a liquid inlet pipe 20. The liquid inlet pipe 20 extends along the length direction of the box body 10. One end of the liquid inlet pipe 20 is in communication with the liquid inlet 120, and the other end is configured with at least two liquid injection ports 210. At least two battery cells 60 are arranged in the immersion cavity 110 along the length direction of the box body 10. Each liquid injection port 210 corresponds to one battery cell 60.

[0038] It can be understood that the immersion liquid flowing from the liquid inlet 120 can be secondarily distributed through the liquid inlet pipe 20, so that each row of battery cells can be liquid-cooled by the immersion liquid sprayed through different liquid injection ports 210. In this way, the possibility of the immersion liquid flowing along the length direction of the box body 10 in the immersion cavity 110 can be reduced, so that the immersion liquid flows along the width direction of the box body 10 as much as possible, thereby shortening the flow path of the immersion liquid.

[0039] At the same time, each row of battery cells corresponds to one liquid injection port 210, which can also improve the temperature difference between the battery cells 60 and prevent the temperature difference between the first row of battery cells and the Nth row of battery cells from being too large. In this way, the temperature consistency of the battery cells 60 can be improved, thereby prolonging the service life of the battery.

[0040] In some embodiments, the aperture of the liquid ejection port 210 is equal to the aperture of the liquid inlet port 120, and thus the flow rate of the immersion liquid at the liquid ejection port 210 is substantially equal to the flow rate of the immersion liquid at the liquid inlet port 120. In some embodiments, the aperture of the liquid ejection port 210 is smaller than the aperture of the liquid inlet port 120, and thus the flow rate of the immersion liquid at the liquid ejection port 210 can be slightly greater than the flow rate of the immersion liquid at the liquid inlet port 120, so as to increase the impact force of the immersion liquid on the outer surface of the battery cell 60 and ensure that the immersion liquid can spread to the upper portion of the battery cell 60. In some embodiments, the aperture of the liquid ejection port 210 is greater than the aperture of the liquid inlet port 120, and thus the flow rate of the immersion liquid at the liquid ejection port 210 is smaller than the flow rate of the immersion liquid at the liquid inlet port 120, so as to reduce the impact force of the immersion liquid on the outer surface of the battery cell 60 and prevent the battery cell 60 from being damaged.

[0041] As shown in FIG. 3, in some embodiments, each liquid ejection port 210 is connected to a liquid ejection pipe 220. The liquid ejection pipe 220 extends along the width direction of the box 10. In this case, the liquid ejection pipe 220 is perpendicular to the outer surface of the corresponding battery cell 60.

[0042] It can be understood that the liquid ejection pipe 220 can limit the ejection direction of the immersion liquid towards the battery cell 60. Since the liquid ejection pipe 220 is perpendicular to the outer surface of the corresponding battery cell 60, the immersion liquid can be caused to spread as evenly as possible in the upward, downward, leftward and rightward directions after being ejected on the surface of the battery cell 60, so as to make the cooling effect in each direction as consistent as possible. In this way, the temperature consistency of the battery cell 60 can be improved, and the service life of the battery can be prolonged.

[0043] In this case, the length of each liquid ejection pipe 220 can be the same or different. The spacing between each liquid ejection pipe 220 and the outer surface of the corresponding battery cell 60 is the same.

[0044] As shown in FIG. 3, in some embodiments, the cavity wall surface of the immersion cavity 110 is provided with a liquid outlet pipe 30. The liquid outlet pipe 30 extends along the length direction of the box 10. One end of the liquid outlet pipe 30 is in communication with the liquid outlet port 130, and the other end is configured with at least two through holes 310, each of which corresponds to a battery cell 60.

[0045] It can be understood that the immersion liquid cooled by the battery cell 60 can flow into the liquid outlet pipe 30 from the through hole 310, and then be discharged from the liquid outlet port 130 after being converged in the liquid outlet pipe 30. In this way, the same discharge of the immersion liquid can be facilitated, and the pipeline arrangement of the water circulation can be facilitated. In this case, each through hole 310 is connected to a liquid discharge pipe 320. The immersion liquid cooled by the battery cell 60 can flow into the liquid outlet pipe 30 from the liquid discharge pipe 320 and the through hole 310.

[0046] Each through hole 310 corresponds to a row of battery cells, and the immersion liquid cooled for the row of battery cells is discharged from the through hole 310, which can reduce the possibility of the immersion liquid flowing in the length direction of the tank 10 and make the immersion liquid flow in the width direction of the tank 10 as much as possible to shorten the flow path of the immersion liquid.

[0047] In some embodiments, the liquid injection port 210 and the through hole 310 are located at the middle position in the height direction of the tank 10. Along the length direction of the tank 10, the liquid injection port 210 and the through hole 310 correspond to each other.

[0048] The path between the liquid injection port 210 and the through hole 310 is the flow path of the immersion liquid. Based on the liquid injection port 210 and the through hole 310 being located at the middle position in the height direction of the tank 10 and corresponding to each other in the length direction, the liquid inlet port 120 and the liquid outlet port 130 can correspond to each other in the XY plane formed by the height direction and the length direction, thereby ensuring that the immersion liquid has the shortest flow path. At the same time, the possibility of vortex of the immersion liquid can be reduced, the flow resistance can be reduced, and the heat exchange efficiency can be improved.

[0049] For example, the liquid inlet pipe 20 is formed with six liquid injection ports 210 in the length direction of the tank 10. The liquid outlet pipe 30 is formed with six through holes 310 in the length direction of the tank 10. The six liquid injection ports 210 and the six through holes 310 are located at the height position of 1 / 2H, and the six liquid injection ports 210 and the six through holes 310 correspond to each other in the length direction of the tank 10.

[0050] As shown in FIG. 4, in some embodiments, the top surface and / or the bottom surface of the tank 10 is provided with a placing support. The placing support is configured to fix the battery cell 60.

[0051] It can be understood that the placing support can reliably fix the battery cell 60 in the immersion cavity 110 to prevent the battery cell 60 from toppling over and improve the stability of the fixation of the battery cell 60. Since the placing support is located at the cavity top surface and / or the cavity bottom surface of the immersion cavity 110, the placing support no longer affects the flow and heat dissipation of the immersion liquid in the immersion cavity 110, and the stability and safety of the battery cell 60 can be improved.

[0052] Among them, the placing support can be arranged only on the top surface of the tank 10. Alternatively, the placing support can be arranged only on the bottom surface of the tank 10. Alternatively, the placing support can be arranged on the top surface and the bottom surface of the tank 10.

[0053] In some embodiments, the placing support is integrally formed with the tank 10. For example, the placing support is integrally formed with the bottom surface of the tank 10. Alternatively, the placing support is integrally formed with the tank cover so that the placing support is located on the top surface of the tank 10.

[0054] As shown in FIG. 4, in some embodiments, the placing bracket is configured with a mounting area 40. The mounting area 40 has m mounting positions 410 distributed along the width direction of the box 10. The mounting positions 410 are configured to fix the battery cell 60. Along the length direction of the box 10, the mounting area 40 is arranged as n. It is satisfied that 0 < m < n, and m and n are integers.

[0055] It can be understood that the battery cell 60 is fixed on the mounting position 410. There are n battery cells 60 along the length direction of the box 10, and there are m battery cells 60 along the width direction of the box 10. Since m < n, and the immersion liquid flows along the width direction of the box 10, it can be ensured that the immersion liquid has a shorter flow path. Cooling the less battery cells 60 on the shorter flow path can reduce the temperature difference between the battery cells 60 at the two ends, and improve the consistency of the temperature of the battery cells 60.

[0056] For example, m = 4 and n = 6. That is, the mounting area 40 has 4 mounting positions 410 distributed along the width direction of the box 10. Along the length direction of the box 10, the mounting area 40 is arranged as 6.

[0057] Referring to FIGS. 3 and 4, in some embodiments, the m mounting positions 410 are arranged at intervals along the width direction of the box 10, so as to form a plurality of first gaps 510 between the plurality of battery cells 60. The n mounting areas 40 are arranged at intervals along the length direction of the box 10, so as to form a plurality of second gaps 520 between the plurality of battery cells 60. The plurality of first gaps 510 and the plurality of second gaps 520 are connected and form the flow guide channel 50.

[0058] It can be understood that the flow guide channel 50 is formed by the gaps between the outer surfaces of the battery cells 60, so that it is not necessary to additionally place a flow guide block, thereby saving cost. At the same time, the immersion liquid can be fully contacted with the outer surfaces of the battery cells 60, and based on the flow of the immersion liquid along the flow guide channel 50, the immersion liquid can cover all areas of the outer surfaces of the battery cells 60, so as to ensure the cooling area and improve the cooling efficiency.

[0059] In some embodiments, the width of the flow guide channel 50 is D, and it is satisfied that 2 mm ≤ D ≤ 4 mm.

[0060] It can be understood that the width D of the flow guide channel 50 is set to be between 2 mm and 4 mm, which can save the space of the XY plane on the one hand, and can improve the flow field of the immersion liquid on the other hand, thereby facilitating the uniform distribution of the immersion liquid. When the width D of the flow guide channel 50 is less than 2 mm, the flow resistance of the immersion liquid will be increased, which is not conducive to the uniform distribution of the immersion liquid, and causes the cooling effect to be inconsistent in each direction and affects the cooling efficiency. When the width D of the flow guide channel 50 is greater than 4 mm, the flow field of the immersion liquid will be affected, which also causes the cooling effect to be inconsistent in each direction and affects the cooling efficiency.

[0061] For example, the width D of the flow guide channel 50 is set to 2 mm, 3 mm, 4 mm, or any value between any two of them.

[0062] The width D of the flow guide channel 50 is not affected by the radius of the battery cell 60. The above-mentioned width of the flow guide channel 50 is applicable to all types of cylindrical battery cells.

[0063] The width D of the flow guide channel 50 in the embodiment of the present application is particularly suitable for cylindrical battery cells, and is defined as the minimum gap between two adjacent cylindrical battery cells. That is, the extension line of the width D passes through the centers of the two adjacent battery cells 60.

[0064] As shown in FIG. 2 and FIG. 4, in some embodiments, the battery cell 60 is a cylindrical battery cell, and the mounting area 40 in the odd row is staggered with the mounting area 40 in the even row.

[0065] Based on the fact that the battery cell 60 is a cylindrical battery cell, the mounting area 40 in the odd row is staggered with the mounting area 40 in the even row, which can improve the space utilization of the XY plane and make the most of the internal space of the immersion cavity 110. In this way, more battery cells 60 can be placed in the immersion cavity 110, and the capacity of the battery pack can be improved.

[0066] The mounting area 40 in the odd row is staggered with the mounting area 40 in the even row, which means that the extension line of the first gap 510 of the mounting area 40 in the odd row passes through the center of the mounting area 40 in the even row, or the first gap 510 of the mounting area 40 in the odd row is staggered with the first gap 510 of the mounting area 40 in the even row.

[0067] In some embodiments, a flow guide area is formed between at least two adjacent battery cells, and the flow guide area is configured to flow through the immersion liquid.

[0068] It can be understood that the flow guide area formed between the plurality of battery cells is configured to flow through the immersion liquid, so that the immersion liquid can simultaneously cool the plurality of battery cells and improve the cooling efficiency.

[0069] As shown in FIG. 4, in some embodiments, there is a flow guide area 70 between every three adjacent battery cells 60. The flow guide area 70 has a circular cross-section in the horizontal direction and circumscribes the three battery cells 60. The radius of the flow guide area 70 is R1, and the radius of the battery cell 60 is R2. It is satisfied that 1 / 6≤R1 / R2≤1 / 4.

[0070] It can be understood that setting the ratio between the radius R1 of the flow guide area 70 and the radius R2 of the battery cell 60 to between 1 / 6 and 1 / 4 can save space in the XY plane and improve the flow field of the immersion liquid, which is conducive to uniform distribution of the immersion liquid. When the ratio between the radius R1 of the flow guide area 70 and the radius R2 of the battery cell 60 is less than 1 / 6, the flow resistance of the immersion liquid will increase, which is not conducive to uniform distribution of the immersion liquid, resulting in inconsistent cooling effect in each direction and affecting the cooling efficiency. When the ratio between the radius R1 of the flow guide area 70 and the radius R2 of the battery cell 60 is greater than 1 / 4, the flow field of the immersion liquid will be affected, which will also result in inconsistent cooling effect in each direction and affect the cooling efficiency.

[0071] For example, the ratio between the radius R1 of the flow guide area 70 and the radius R2 of the battery cell 60 is set to 1 / 6, 1 / 5, 1 / 4, or any value between any two of them.

[0072] For example, the radius R1 of the flow guide area 70 is set to 5 mm, and the radius R2 of the battery cell 60 is set to 20 mm. For example, the radius R1 of the flow guide area 70 is set to 4.7 mm, and the radius R2 of the battery cell 60 is set to 23 mm.

[0073] The application also provides a battery pack, which comprises the immersion liquid cooling box as described in the foregoing embodiments.

[0074] In the application, by arranging the liquid inlet 120 and the liquid outlet 130 on opposite sides of the width direction of the box body 10, the immersion liquid can flow along the width direction of the box body 10, thereby shortening the flow path of the immersion liquid and reducing the temperature difference between the battery cells 60, which improves the service life of the battery.

Claims

1. An immersion liquid-cooled tank, comprising: a tank body configured with an immersion cavity configured to place battery cells, the immersion cavity being formed with a liquid inlet and a liquid outlet at opposite sides of the tank body in a width direction of the tank body.

2. The immersion liquid-cooled case of claim 1, wherein, the liquid inlet and the liquid outlet are both located at a middle position in a height direction of the tank body; and / or, the liquid inlet and the liquid outlet are both located at a middle position in a length direction of the tank body.

3. The immersion liquid-cooled case of claim 2, wherein, the liquid inlet is configured to inject an immersion liquid into the immersion cavity, a flow rate of the immersion liquid at the liquid inlet being Q, satisfying: 8 L / min≤Q≤20 L / min.

4. The immersion liquid-cooled tank of any one of claims 1-3, wherein, a liquid inlet channel is arranged on a cavity wall surface of the immersion cavity, the liquid inlet channel extending along the length direction of the tank body, one end of the liquid inlet channel being in communication with the liquid inlet, and the other end being configured with at least two liquid injection ports, at least two battery cells being arranged in the immersion cavity along the length direction of the tank body, each of the liquid injection ports corresponding to one of the battery cells.

5. The immersion liquid-cooled case of claim 4, wherein, each of the liquid injection ports is connected to a liquid injection pipe, the liquid injection pipe extending along the width direction of the tank body, wherein the liquid injection pipe is perpendicular to an outer surface of the corresponding battery cell.

6. The immersion liquid-cooled case of claim 4 or 5, wherein, a liquid outlet channel is arranged on the cavity wall surface of the immersion cavity, the liquid outlet channel extending along the length direction of the tank body, one end of the liquid outlet channel being in communication with the liquid outlet, and the other end being configured with at least two through holes, each of the through holes corresponding to one of the battery cells.

7. The immersion liquid-cooled case of claim 6, wherein, the liquid injection ports and the through holes are both located at the middle position in the height direction of the tank body, and the liquid injection ports and the through holes correspond to each other along the length direction of the tank body.

8. The immersion liquid-cooled case of any of claims 1-7, wherein, a placement support is arranged on a top surface and / or a bottom surface of the tank body, the placement support being configured to fix the battery cells.

9. The immersion liquid-cooled case of claim 8, wherein, the placement support is configured with a mounting area, the mounting area having m mounting positions distributed along the width direction of the tank body, the mounting positions being configured to fix the battery cells, the mounting area being arranged as n along the length direction of the tank body, satisfying: 0 10. The immersion liquid-cooled case of claim 9, wherein, m mounting positions are arranged along the width direction of the tank body, so that a plurality of first gaps are formed between the battery cells, n mounting areas are arranged along the length direction of the tank body, so that a plurality of second gaps are formed between the battery cells, the plurality of first gaps and the plurality of second gaps being in communication and forming a flow guide channel.

11. The immersion liquid-cooled case of claim 10, wherein, a width of the flow guide channel is D, satisfying: 2 mm≤D≤4 mm.

12. The immersion liquid-cooled tank of any of claims 9-11, wherein, the battery cells include cylindrical battery cells, the mounting areas in odd rows being distributed in a staggered manner with the mounting areas in even rows.

13. The immersion liquid-cooled case of claim 12, wherein, each of at least two adjacent battery cells forms a flow guide area configured to flow through the immersion liquid.

14. The immersion liquid-cooled case of claim 13, wherein, each of three adjacent battery cells has a flow guide area, a cross section of the flow guide area in a horizontal direction being circular and circumscribing the three battery cells, wherein a radius of the flow guide area is R1, and a radius of the battery cells is R2, satisfying: 1 / 6≤R1 / R2≤1 / 4.

15. A battery pack comprising the immersion liquid-cooled tank according to any one of claims 1-14.

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