Immersed liquid cooling box and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides an immersed liquid cooling box and a battery pack. The immersed liquid cooling box comprises a box body. The box body is provided with an immersion cavity configured to place a battery cell. And the immersion cavity is provided with a liquid inlet and a liquid outlet in the outer surface of the box body. The liquid inlet and the liquid outlet are located in the two opposite sides of the box body in the width direction respectively. Therefore, the flow path of the immersion liquid can be shortened, the temperature difference between the battery cells is reduced, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to immersion liquid cooling box and battery pack. BACKGROUND

[0002] In the related art, when the battery cell adopts the immersion liquid cooling scheme, 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. Among them, the liquid inlet and the liquid outlet are located on the opposite sides of the length direction of the box body. Therefore, the flow path of the immersion liquid is large, which causes a large temperature difference between the battery cell located at the liquid inlet and the battery cell located at the liquid outlet. SUMMARY

[0003] The embodiment of the utility model provides a kind of immersion liquid cooling box and battery pack, can shorten the flow path of immersion liquid, improve the technical problem of excessive temperature difference of battery cell.

[0004] In the first aspect, the embodiment of the utility model provides an immersion liquid cooling box, comprising:

[0005] Box body is configured to place battery cell and is formed with liquid inlet and liquid outlet on the outer surface of the box body, and the liquid inlet and the liquid outlet are located on the opposite sides of the width direction of the box body.

[0006] In an embodiment, the liquid inlet and the liquid outlet are located at the middle position of the height direction of the box body.

[0007] And / or, the liquid inlet and the liquid outlet are located at the middle position of the length direction of the box body.

[0008] In an embodiment, the liquid inlet is configured to inject immersion liquid into the immersion cavity, and the flow rate of the immersion liquid at the liquid inlet is Q, which satisfies: 8L / min≤Q≤20L / min.

[0009] In an embodiment, the cavity wall surface of the immersion cavity is provided with a liquid inlet pipeline, the liquid inlet pipeline extends along the length direction of the box body, one end of the liquid inlet pipeline communicates with the liquid inlet, and the other end is configured with at least two liquid injection ports, and at least two battery cells are arranged along the length direction of the box body in the immersion cavity. Each liquid injection port corresponds to one battery cell.

[0010] In an embodiment, each liquid injection port is connected with a liquid injection pipe, and the liquid injection pipe extends along the width direction of the box body, wherein the liquid injection pipe is perpendicular to the outer surface of the corresponding battery cell.

[0011] In one embodiment, a liquid outlet pipe is provided on the wall surface of the immersion chamber, and the liquid outlet pipe extends along the length direction of the box body. One end of the liquid outlet pipe is connected to the liquid outlet, and the other end is constructed with at least two through holes, each of the through holes corresponds to one of the battery cells.

[0012] In one embodiment, the liquid spraying port and the through hole are both located in the middle of the box body in the height direction, and along the length direction of the box body, the liquid spraying port and the through hole correspond one to one.

[0013] In one embodiment, a placement bracket is provided on the top surface and / or the bottom surface of the box body, and the placement bracket is configured to fix the battery cell.

[0014] In one embodiment, the placement bracket is constructed with an installation area, which has m installation positions distributed along the width direction of the box body, and the installation positions are configured to fix the battery cells. Along the length direction of the box body, the installation areas are set to n, satisfying: 0<m<n, and m and n are both integers.

[0015] In one embodiment, m of the mounting positions are spaced apart along the width direction of the box body so that a plurality of first gaps are formed between the plurality of battery cells, and n of the mounting areas are spaced apart along the length direction of the box body so that a plurality of second gaps are formed between the plurality of battery cells, and the plurality of first gaps are connected to the plurality of second gaps to form a guide channel.

[0016] In one embodiment, the width of the guide channel is D, which satisfies: 2 mm ≤ D ≤ 4 mm.

[0017] In one embodiment, the battery cells include cylindrical battery cells, and the mounting areas located in odd-numbered rows and the mounting areas located in even-numbered rows are staggered.

[0018] In one embodiment, a flow guiding area is formed between at least two adjacent battery cells, and the flow guiding area is configured to flow through the immersion liquid.

[0019] In one embodiment, there is a guide area between every three adjacent battery cells, the cross-section of the guide area in the horizontal direction is circular, and is circumscribed to the three battery cells, wherein the radius of the guide area is R1, and the radius of the battery cell is R2, satisfying: 1 / 6≤R1 / R2≤1 / 4.

[0020] In a second aspect, an embodiment of the present invention provides a battery pack comprising the aforementioned immersion liquid cooling box.

[0021] Beneficial effects of the embodiments of the present utility model:

[0022] In an embodiment of the present invention, by arranging the liquid inlet and the liquid outlet on opposite sides of the width direction of the box body, the immersion liquid can flow along the width direction of the box body, thereby shortening the flow path of the immersion liquid, reducing the temperature difference between the battery cells, and improving the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a three-dimensional schematic diagram of a box provided by an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the distribution of battery cells provided in an embodiment of the present utility model;

[0026] Figure 3 This is a cross-sectional view of a case with a battery cell placed therein provided by an embodiment of the present utility model;

[0027] Figure 4 This is a cross-sectional view of the box provided by an embodiment of the present invention when no battery cells are placed;

[0028] Figure 5 This is one of the streamline diagrams of the immersion liquid in the immersion liquid cooling box provided by the embodiment of the present utility model;

[0029] Figure 6 This is the second streamline diagram of the immersion liquid in the immersion liquid cooling box provided by the embodiment of the present utility model;

[0030] Figure 7 This is the third streamline diagram of the immersion liquid in the immersion liquid cooling box provided by the embodiment of the present utility model.

[0031] Reference numerals:

[0032] 10-box, 110-immersion chamber, 120-liquid inlet, 130-liquid outlet, 20-liquid inlet pipe, 210-liquid spray port, 220-liquid spray pipe, 30-liquid outlet pipe, 310-through hole, 320-liquid drain pipe, 40-installation area, 410-installation position, 50-guiding channel, 510-first gap, 520-second gap, 60-battery cell, 70-guiding area. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0034] Please refer to Figures 1 to 7 The present application provides an immersion liquid cooling box. The immersion liquid cooling box comprises a box body 10. The box body 10 is configured with an immersion cavity 110 configured to place the battery cell 60. The immersion cavity 110 is formed with a liquid inlet 120 and a liquid outlet 130 on the outer surface of the box body 10. The liquid inlet 120 and the liquid outlet 130 are respectively located on the opposite sides of the width direction of the box body 10.

[0035] In the embodiments of the present application, by arranging the liquid inlet 120 and the liquid outlet 130 on the 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, reducing the temperature difference between the battery cells 60, and improving the service life of the battery.

[0036] It can be understood that the liquid inlet 120 is the inlet of the immersion liquid flowing into the immersion cavity 110, and the liquid outlet 130 is the outlet of the immersion liquid flowing 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 cell 60, the immersion liquid can diverge in four directions of up, down, left and right, and continuously flow from the gap between the adjacent two battery cells 60 to the direction of the liquid outlet 130. Thus, 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.

[0037] In some embodiments, the box body 10 is arranged in a rectangular cuboid shape. The box body 10 has a length side, a width side and a height side, the width direction of the box body 10 is the direction in which the width side of the box body 10 extends, the length direction of the box body 10 described below is the direction in which the length side of the box body 10 extends, and the height direction of the box body 10 described below is the direction in which the height side of the box body 10 extends.

[0038] Since the housing 10 is configured as a rectangular parallelepiped, the immersion chamber 110 can also be configured as a rectangular parallelepiped. When the immersion chamber 110 is rectangular, it is suitable for accommodating a square battery cell 60. When the battery cell 60 is a cylindrical battery cell, the inner surface of the immersion chamber 110 can be provided with an arc surface, and the corresponding radius of the arc surface is adapted to the radius of the battery cell 60.

[0039] The upper surface of the box body 10 may be formed with an opening so that the battery cell 60 can be installed into the immersion chamber 110 through the opening. The opening may be closed by a box cover, and the box cover and the box body 10 may be sealed with a seal to prevent the immersion liquid from overflowing from the opening of the box body 10.

[0040] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located in the middle of the box body 10 in the height direction.

[0041] It is understood that by locating both the liquid inlet 120 and the liquid outlet 130 at the middle of the height of the housing 10, the inlet 120 and the outlet 130 are aligned at the same height, ensuring the shortest possible flow path for the immersion liquid. Furthermore, the height alignment of the liquid inlet 120 and the outlet 130 reduces the likelihood of vortices forming in the immersion liquid, lowering flow resistance and improving heat exchange efficiency.

[0042] For example, Figure 1 As shown, the height of the box body 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 chamber 110 at a certain flow rate, after the immersion liquid contacts the battery cell 60, the immersion liquid can be sprayed in four directions of up, down, left and right. Because the liquid inlet 120 is located at the position of 1 / 2H, the flow paths of the immersion liquid sprayed in the upper and lower directions are the same, and it is convenient to make the cooling effects of the upper and lower areas of the battery cell 60 basically the same, further improving the temperature consistency of the battery cell 60. At the same time, the location of the liquid inlet 120 at the position of 1 / 2H can also ensure that the immersion liquid can be sprayed to the top of the battery cell 60 after forming a spray on the outer surface of the battery cell 60, ensuring that the top of the battery cell 60 can be dissipated.

[0043] For example, the height of the box body 10 is H. The middle position in the height direction can be 2 / 5H to 3 / 5H. No matter which section the middle position in the height direction of the box body 10 is, it is sufficient to ensure that the liquid inlet 120 and the liquid outlet 130 are at the same height.

[0044] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located in the middle of the length direction of the box body 10 .

[0045] It is understood that by locating both the liquid inlet 120 and the liquid outlet 130 in the middle of the longitudinal direction of the housing 10, the liquid inlet 120 and the liquid outlet 130 are aligned in the longitudinal direction to ensure that the immersion liquid has the shortest flow path. Furthermore, the longitudinal alignment of the liquid inlet 120 and the liquid outlet 130 can reduce the possibility of vortexes in the immersion liquid, reduce flow resistance, and improve heat exchange efficiency.

[0046] For example, Figure 1 As shown, the length of the housing 10 is L. The middle position in the longitudinal direction can be the 1 / 2L position. When the immersion liquid is injected into the immersion chamber 110 at a certain flow rate, after the immersion liquid contacts the battery cell 60, the immersion liquid can be sprayed in four directions: up, down, left, and right. Because the liquid inlet 120 is located at the 1 / 2L position, the flow path of the immersion liquid sprayed in the left and right directions is the same, which facilitates the cooling effect of the left and right areas of the battery cell 60 to be basically the same, further improving the temperature consistency of the battery cell 60.

[0047] For example, the length of the box body 10 is L. The middle position in the longitudinal direction can be 2 / 5L to 3 / 5L. No matter which section the middle position in the longitudinal direction of the box body 10 is, it is sufficient to ensure that the liquid inlet 120 and the liquid outlet 130 correspond to each other in the longitudinal direction.

[0048] In some embodiments, the liquid inlet 120 and the liquid outlet 130 are both located in the middle of the height direction of the housing 10, and are also located in the middle of the length direction of the housing 10. This allows the liquid inlet 120 and the liquid outlet 130 to correspond within the XY plane formed by the height and length directions, thereby ensuring the shortest flow path for the immersion liquid. This also reduces the likelihood of vortices forming in the immersion liquid, lowering flow resistance and improving heat exchange efficiency.

[0049] In some embodiments, the liquid inlet 120 is configured to inject immersion liquid into the immersion chamber 110. The flow rate of the immersion liquid at the liquid inlet 120 is Q, which satisfies: 8 L / min≤Q≤20 L / min (liters per minute).

[0050] It is understood that limiting the flow rate of the immersion liquid at the liquid inlet 120 to 8L / min to 20L / min allows the immersion liquid to diffuse above and below the battery cell 60 after impacting the battery cell 60. The immersion liquid that diffuses above the battery cell 60 can flow in the width direction above the battery cell 60, thereby liquid-cooling the upper area of ​​the battery cell 60. The immersion liquid that diffuses below the battery cell 60 can flow in the width direction below the battery cell 60, thereby liquid-cooling the lower area of ​​the battery cell 60. If the flow rate of the immersion liquid at the liquid inlet 120 is less than 8L / min, the immersion liquid may not reach the upper area of ​​the battery cell 60 after impacting the battery cell 60, resulting in poor cooling effect on the upper area of ​​the battery cell 60. If the flow rate of the immersion liquid at the liquid inlet 120 is greater than 20L / min, the impact force of the immersion liquid on the battery cell 60 will be greater, potentially damaging the battery cell 60.

[0051] 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 therebetween.

[0052] like Figures 5 to 7 As shown in the figure, the color gradient distribution represents the flow rate of the immersion liquid in m / s (meters per second), and the red arrow indicates the flow direction of the immersion liquid. Based on the flow rate of the immersion liquid at the liquid inlet 120 and the aperture of the liquid inlet 120, the flow rate of the immersion liquid at the liquid inlet 120 can be approximately 1 m / s.

[0053] like Figure 3 As shown, in some embodiments, a liquid inlet pipe 20 is provided on the wall of the immersion chamber 110. The liquid inlet pipe 20 extends along the length of the housing 10. One end of the liquid inlet pipe 20 is connected to the liquid inlet 120, and the other end is configured with at least two liquid spray ports 210. At least two battery cells 60 are provided within the immersion chamber 110 along the length of the housing 10. Each liquid spray port 210 corresponds to a battery cell 60.

[0054] It is understood that the immersion liquid flowing in from the liquid inlet 120 can be redistributed through the liquid inlet pipe 20, so that each row of battery cells can be liquid-cooled by the immersion liquid sprayed from different liquid spray ports 210. This can reduce the possibility of the immersion liquid in the immersion chamber 110 flowing along the length of the housing 10, and make the immersion liquid flow along the width of the housing 10 as much as possible, thereby shortening the flow path of the immersion liquid.

[0055] At the same time, each row of cells corresponds to a liquid spray port 210, which can also improve the temperature difference between the cells 60 and prevent the temperature difference between the first row of cells and the Nth row of cells from being too large. In this way, the temperature consistency of the cells 60 can be improved and the battery life can be extended.

[0056] In some embodiments, the aperture of the liquid spray port 210 is equal to the aperture of the liquid inlet 120, and the flow rate of the immersion liquid at the liquid spray port 210 is substantially equal to the flow rate of the immersion liquid at the liquid inlet 120. In some embodiments, the aperture of the liquid spray port 210 is smaller than the aperture of the liquid inlet 120, and the flow rate of the immersion liquid at the liquid spray port 210 may be slightly greater than the flow rate of the immersion liquid at the liquid inlet 120, thereby increasing the impact force of the immersion liquid on the outer surface of the battery cell 60 and ensuring that the immersion liquid can spread above the battery cell 60. In some embodiments, the aperture of the liquid spray port 210 is larger than the aperture of the liquid inlet 120, and the flow rate of the immersion liquid at the liquid spray port 210 is less than the flow rate of the immersion liquid at the liquid inlet 120, thereby reducing the impact force of the immersion liquid on the outer surface of the battery cell 60 and preventing damage to the battery cell 60.

[0057] like Figure 3 As shown, in some embodiments, each liquid spraying port 210 is connected to a liquid spraying pipe 220. The liquid spraying pipe 220 extends along the width direction of the box body 10. The liquid spraying pipe 220 is perpendicular to the outer surface of the corresponding battery cell 60.

[0058] It is understood that the spray tube 220 can limit the direction in which the immersion liquid is sprayed toward the battery cell 60. Because the spray tube 220 is perpendicular to the outer surface of the corresponding battery cell 60, the immersion liquid can be sprayed onto the surface of the battery cell 60 and diffused as evenly as possible in the four directions of up, down, left, and right, ensuring the most consistent cooling effect in all directions. This improves the temperature consistency of the battery cell 60 and extends the battery life.

[0059] The lengths of the liquid spraying pipes 220 may be the same or different, and the distances between the liquid spraying pipes 220 and the outer surface of the corresponding battery cell 60 are the same.

[0060] like Figure 3 As shown, in some embodiments, a liquid outlet pipe 30 is provided on the wall of the immersion chamber 110. The liquid outlet pipe 30 extends along the length of the housing 10. One end of the liquid outlet pipe 30 is connected to the liquid outlet 130, and the other end is configured with at least two through holes 310, each of which corresponds to a battery cell 60.

[0061] It is understood that the immersion liquid after cooling the battery cells 60 will flow from the through-holes 310 into the liquid outlet pipe 30, where it will converge and be discharged from the liquid outlet 130. This facilitates the uniform discharge of the immersion liquid and the layout of the water circulation pipeline. Each through-hole 310 is connected to a drain pipe 320. The immersion liquid after cooling the battery cells 60 can flow from the drain pipe 320 and the through-holes 310 into the liquid outlet pipe 30.

[0062] Each through hole 310 corresponds to a row of battery cells, and the immersion liquid after cooling the row of battery cells is discharged from the through hole 310, which can reduce the possibility of the immersion liquid in the immersion chamber 110 flowing along the length direction of the box body 10, and make the immersion liquid flow along the width direction of the box body 10 as much as possible, thereby shortening the flow path of the immersion liquid.

[0063] In some embodiments, the liquid spraying port 210 and the through hole 310 are both located in the middle of the height direction of the box body 10. Along the length direction of the box body 10, the liquid spraying port 210 and the through hole 310 correspond one to one.

[0064] The path between the liquid spray port 210 and the through hole 310 is the flow path of the immersion liquid. The liquid spray port 210 and the through hole 310 are both located in the middle of the height direction of the housing 10 and correspond one-to-one in the length direction. This allows the liquid inlet 120 and the liquid outlet 130 to correspond in the XY plane formed by the height and length directions, thereby ensuring the shortest flow path for the immersion liquid. This also reduces the possibility of vortexes in the immersion liquid, reduces flow resistance, and improves heat exchange efficiency.

[0065] For example, the liquid inlet pipe 20 is formed with six liquid spraying ports 210 along the length of the housing 10. The liquid outlet pipe 30 is formed with six through holes 310 along the length of the housing 10. The six liquid spraying ports 210 and the six through holes 310 are all located at a height of 1 / 2H, and the six liquid spraying ports 210 and the six through holes 310 correspond one to one along the length of the housing 10.

[0066] like Figure 4 As shown, in some embodiments, a placement bracket is provided on the top surface and / or bottom surface of the box body 10. The placement bracket is configured to fix the battery cell 60.

[0067] It is understood that the placement of the bracket can reliably secure the battery cell 60 within the immersion chamber 110, thereby preventing the battery cell 60 from tipping over and improving the stability of the battery cell 60. Since the placement bracket is located on the top and / or bottom surface of the immersion chamber 110, the placement of the bracket does not affect the flow and heat dissipation of the immersion liquid within the immersion chamber 110, and can improve the stability and safety of the battery cell 60.

[0068] The placement bracket may be provided only on the top surface of the box body 10. Alternatively, the placement bracket may be provided only on the bottom surface of the box body 10. Alternatively, the placement bracket may be provided on both the top surface and the bottom surface of the box body 10.

[0069] In some embodiments, the placement bracket is integrally formed with the box body 10. For example, the placement bracket is integrally formed with the bottom surface of the box body 10. Alternatively, the placement bracket is integrally formed with the box cover so that the placement bracket is located on the top surface of the box body 10.

[0070] like Figure 4As shown, in some embodiments, the placement bracket is configured with a mounting area 40. Mounting area 40 has m mounting positions 410 distributed along the width of the housing 10. Mounting positions 410 are configured to secure battery cells 60. There are n mounting areas 40 along the length of the housing 10, satisfying the following: 0 < m < n, where m and n are both integers.

[0071] It is understood that the battery cells 60 are fixed to the mounting positions 410. There are n battery cells 60 along the length of the housing 10 and m battery cells 60 along the width of the housing 10. Since m < n and the immersion liquid flows along the width of the housing 10, a shorter flow path for the immersion liquid can be ensured. This shorter flow path cools fewer battery cells 60, further reducing the temperature difference between the battery cells 60 at the front and rear ends, thereby improving the temperature consistency of the battery cells 60.

[0072] For example, m=4, n=6. That is, the installation area 40 has four installation positions 410 distributed along the width direction of the box body 10. Along the length direction of the box body 10, there are six installation areas 40.

[0073] See also Figure 3 and Figure 4 In some embodiments, the m mounting positions 410 are spaced apart along the width of the housing 10 to form a plurality of first gaps 510 between the battery cells 60. The n mounting areas 40 are spaced apart along the length of the housing 10 to form a plurality of second gaps 520 between the battery cells 60. The plurality of first gaps 510 and the plurality of second gaps 520 communicate with each other to form a flow channel 50.

[0074] It is understood that by utilizing the gaps between the outer surfaces of the battery cells 60 to form the flow channels 50, there is no need for additional flow guide blocks, thus saving costs. Furthermore, the immersion liquid can be fully contacted with the outer surfaces of the battery cells 60. As the immersion liquid flows along the flow channels 50, it covers the entire outer surface of the battery cells 60, ensuring a sufficient cooling area and improving cooling efficiency.

[0075] In some embodiments, the width of the guide channel 50 is D, which satisfies: 2 mm ≤ D ≤ 4 mm.

[0076] It is understood that setting the width D of the guide channel 50 between 2 mm and 4 mm can, on the one hand, save space in the XY plane, and on the other hand, improve the flow field of the immersion liquid, facilitating uniform distribution of the immersion liquid. When the width D of the guide channel 50 is less than 2 mm, the flow resistance of the immersion liquid increases, which is not conducive to uniform distribution of the immersion liquid, resulting in inconsistent cooling effects in different directions and affecting cooling efficiency. When the width D of the guide channel 50 is greater than 4 mm, it affects the flow field of the immersion liquid, similarly resulting in inconsistent cooling effects in different directions and affecting cooling efficiency.

[0077] For example, the width D of the guide channel 50 is set to 2 mm, 3 mm, 4 mm, or any value therebetween.

[0078] The width D of the flow guiding channel 50 is not affected by the radius of the battery cell 60. The above-mentioned width of the flow guiding channel 50 is applicable to all types of cylindrical battery cells.

[0079] The immersion liquid cooling box in the embodiment of the present application is particularly suitable for cylindrical battery cells. The width D of the guide channel 50 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 two adjacent battery cells 60.

[0080] like Figure 2 and Figure 4 As shown, in some embodiments, the battery cells 60 are cylindrical battery cells, and the mounting areas 40 located in odd-numbered rows are staggered with the mounting areas 40 located in even-numbered rows.

[0081] Because the battery cells 60 are cylindrical, staggering the mounting areas 40 in odd-numbered rows with those in even-numbered rows improves space utilization in the XY plane, maximizing the internal space of the immersion chamber 110. This allows for more battery cells 60 to be placed within the immersion chamber 110, increasing the capacity of the battery pack.

[0082] The staggered distribution of the installation areas 40 located in odd rows and the installation areas 40 located in even rows means that: the extension line of the first gap 510 of the installation areas 40 located in odd rows passes through the center of the installation areas 40 located in even rows; or, the first gap 510 of the installation areas 40 located in odd rows and the first gap 510 of the installation areas 40 located in even rows are staggered.

[0083] In some embodiments, a flow guiding area is formed between at least two adjacent battery cells, and the flow guiding area is configured to flow through the immersion liquid.

[0084] It is understandable that the guide area formed between the multiple battery cells is used to flow through the immersion liquid, so that the immersion liquid can liquid-cool the multiple battery cells at the same time, thereby improving the cooling efficiency.

[0085] like Figure 4 As shown, in some embodiments, a flow guide region 70 is provided between every three adjacent battery cells 60. The flow guide region 70 has a circular cross-section in the horizontal direction and circumscribes the three battery cells 60. The radius of the flow guide region 70 is R1. The radius of the battery cell 60 is R2. The following conditions are satisfied: 1 / 6 ≤ R1 / R2 ≤ 1 / 4.

[0086] It can be understood that the ratio between the radius R1 of the flow guide area 70 and the radius R2 of the battery cell 60 is set to between 1 / 6 and 1 / 4, which can save space in the XY plane on the one hand, and improve the flow field of the immersion liquid on the other hand, which is beneficial to the 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 be increased, which is not conducive to the 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 cause inconsistent cooling effect in each direction and affect the cooling efficiency.

[0087] 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.

[0088] For example, the radius R1 of the flow guide area 70 is set to 5mm, and the radius R2 of the battery cell 60 is set to 20mm. For example, the radius R1 of the flow guide area 70 is set to 4.7mm, and the radius R2 of the battery cell 60 is set to 23mm.

[0089] The application also provides a battery pack, which comprises the immersion liquid cooling tank as in the foregoing embodiments.

[0090] In the embodiments of the application, by arranging the liquid inlet 120 and the liquid outlet 130 on opposite sides of the width direction of the tank body 10, the immersion liquid can flow along the width direction of the tank body 10, thereby shortening the flow path of the immersion liquid to reduce the temperature difference between the battery cells 60 and improve the service life of the battery.

[0091] The embodiments of the application are described in detail above, and the principles and implementation modes of the application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the application.

Claims

1. An immersion liquid cooling box, characterized in that: include: The box body is constructed with an immersion cavity configured to place the battery cell, and 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 of the box body in the width direction.

2. The immersion liquid cooling box according to claim 1, characterized in that: The liquid inlet and the liquid outlet are both located in the middle of the box in the height direction; And / or, the liquid inlet and the liquid outlet are both located in the middle of the length direction of the box.

3. The immersion liquid cooling box according to claim 2, characterized in that: The liquid inlet is configured to inject immersion liquid into the immersion chamber, and the flow rate of the immersion liquid at the liquid inlet is Q, which satisfies: 8 L / min≤Q≤20 L / min.

4. The immersion liquid cooling box according to any one of claims 1 to 3, characterized in that: A liquid inlet pipe is provided on the wall surface of the immersion chamber, and the liquid inlet pipe extends along the length direction of the box body. One end of the liquid inlet pipe is connected to the liquid inlet, and the other end is constructed with at least two liquid spray outlets. At least two battery cells are provided in the immersion chamber along the length direction of the box body, and each of the liquid spray outlets corresponds to one of the battery cells.

5. The immersion liquid cooling box according to claim 4, characterized in that: Each of the liquid spraying ports is connected to a liquid spraying pipe, and the liquid spraying pipe extends along the width direction of the box body, wherein the liquid spraying pipe is perpendicular to the outer surface of the corresponding battery core.

6. The immersion liquid cooling box according to claim 4, characterized in that: A liquid outlet pipe is provided on the wall surface of the immersion chamber, and the liquid outlet pipe extends along the length direction of the box body. One end of the liquid outlet pipe is connected to the liquid outlet, and the other end is constructed with at least two through holes, each of which corresponds to one of the battery cells.

7. The immersion liquid cooling box according to claim 6, characterized in that: The liquid spraying port and the through hole are both located in the middle of the box body in the height direction. Along the length direction of the box body, the liquid spraying port and the through hole correspond one to one.

8. The immersion liquid cooling box according to any one of claims 1 to 3, characterized in that: A placement bracket is provided on the top surface and / or bottom surface of the box body, and the placement bracket is configured to fix the battery core.

9. The immersion liquid cooling box according to claim 8, characterized in that: The placement bracket is constructed with an installation area, which has m installation positions distributed along the width direction of the box body. The installation positions are configured to fix the battery cells. Along the length direction of the box body, the installation areas are set to n, satisfying: 0<m<n, and m and n are both integers.

10. The immersion liquid cooling box according to claim 9, characterized in that: The m mounting positions are spaced apart along the width direction of the box body so as to form a plurality of first gaps between the plurality of battery cells, and the n mounting areas are spaced apart along the length direction of the box body so as to form a plurality of second gaps between the plurality of battery cells, and the plurality of first gaps are connected to the plurality of second gaps to form a guide channel.

11. The immersion liquid cooling box according to claim 10, characterized in that: The width of the guide channel is D, which satisfies: 2 mm ≤ D ≤ 4 mm.

12. The immersion liquid cooling box according to claim 9, characterized in that: The battery cells include cylindrical battery cells, and the installation areas located in odd-numbered rows and the installation areas located in even-numbered rows are staggered.

13. The immersion liquid cooling box according to claim 12, characterized in that: A flow guiding area is formed between at least two adjacent battery cells, and the flow guiding area is configured to flow through the immersion liquid.

14. The immersion liquid cooling box according to claim 13, characterized in that: There is a guide area between every three adjacent battery cells. The cross-section of the guide area in the horizontal direction is circular and is circumscribed to the three battery cells. The radius of the guide area is R1, and the radius of the battery cell is R2, satisfying: 1 / 6≤R1 / R2≤1 / 4.

15. A battery pack, characterized in that: Comprising the immersion liquid cooling box according to any one of claims 1-14.

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