Immersed liquid-cooled battery pack

Abstract

The invention discloses an immersed liquid-cooled battery pack, and relates to the technical field of battery thermal management. A plurality of battery cell columns, and in each battery cell column, a cooling flow channel is arranged in each battery cell gap or every at least one battery cell gap; the liquid inlet shunt tube is arranged close to the central area of the whole battery cell columns, one end of the liquid inlet shunt tube is provided with a first liquid inlet, the other end of the liquid inlet shunt tube is closed, and two sides are provided with first liquid outlets; the backflow collecting pipe comprises two backflow sections and a collecting section, the two backflow sections are located on the two sides of the whole battery cell columns, each backflow section is provided with a second liquid inlet, and the collecting section is provided with a second liquid outlet; the areas of the first liquid outlet and the second liquid inlet are gradually increased from one end of the liquid inlet shunt pipe to the other end of the liquid inlet shunt pipe, so that the flow of cooling liquid in each cooling flow channel of the battery cell column is balanced. By optimizing the layout of the cooling flow, the liquid inlet shunting pipe and the backflow collecting pipe, the use amount of the cooling liquid and the temperature difference between the blade and the battery cell can be reduced, and the space utilization rate and the cooling efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of battery thermal management technology, and in particular to an immersion liquid-cooled battery pack. Background Art

[0002] Traditional blade battery systems typically employ thermal management solutions by installing heat exchange plates at the bottom, top, or both of the battery cells to control temperature, and placing thermal insulation materials such as aerogel between adjacent cells to prevent heat spread. However, this solution has certain limitations: Firstly, the small contact surface between the cell and the heat exchange plate limits the cell's ability to charge and discharge at high rates, making it unsuitable for applications requiring rapid battery charge and discharge. Secondly, ensuring thorough thermal insulation between cells requires the use of high-performance or thicker insulation materials, which increases production costs and reduces the product's price competitiveness in the market.

[0003] The immersion cooling solution can greatly improve the heat dissipation efficiency by directly immersing the battery cells in the coolant, allowing the cells to maintain a good temperature state even during high-rate charge and discharge, effectively overcoming the problem of insufficient heat dissipation in traditional thermal management solutions. However, the immersion cooling solution currently used in blade battery systems also has shortcomings: on the one hand, the solution requires the use of a large amount of coolant to ensure effective cooling of the battery cells. Excessive coolant will increase the overall weight of the battery pack, which will have an adverse effect on weight-sensitive application scenarios such as electric vehicles; on the other hand, in actual applications, there is uneven coolant flow between battery cells, which will lead to large temperature differences between the individual battery cells. Long-term exposure to such large temperature differences will affect the consistency and service life of the battery, and reduce the overall performance and stability of the battery system. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an immersion liquid-cooled battery pack to solve at least one of the above technical problems.

[0005] The present application provides an immersion liquid-cooled battery pack, comprising: a box body; a plurality of battery cell rows, each battery cell row comprising a plurality of blade battery cells arranged along a first direction, a battery cell gap between adjacent blade battery cells, a cooling channel provided in each battery cell gap or every at least one battery cell gap, the plurality of battery cell rows being arranged in the box body along a second direction, the second direction being perpendicular to the first direction; a liquid inlet shunt pipe, arranged near the central area of the plurality of battery cell rows as a whole, the liquid inlet shunt pipe extending along the first direction and having a first liquid inlet port provided at one end and a closed end, the liquid inlet shunt pipe having a second liquid inlet port provided on two opposite sides in the second direction A liquid outlet; and a reflux manifold, comprising two reflux sections and a confluence section, the two reflux sections being located on both sides of the plurality of battery cell columns as a whole in the second direction, each reflux section extending along the first direction and having one end connected to the confluence section and the other end closed, each reflux section being provided with a second liquid inlet, and the confluence section being provided with a second liquid outlet; wherein the first liquid outlet and the second liquid inlet both correspond to the cooling channels of adjacent battery cell columns, and the areas of the first liquid outlet and the second liquid inlet both gradually increase from one end of the liquid inlet manifold to the other end, so as to achieve a balanced flow of coolant in each cooling channel of the battery cell column.

[0006] In some optional embodiments, the cooling channel is composed of multiple channel limiting strips, each channel limiting strip extends along the second direction and is connected to the blade battery cell, and the multiple channel limiting strips are arranged at intervals in the second direction and the third direction, and the third direction is perpendicular to the first direction and the second direction.

[0007] In some optional embodiments, when the number of battery cell columns is an even number, the liquid inlet shunt tube is arranged between the two middle battery cell columns; when the number of battery cell columns is an odd number greater than 1, the liquid inlet shunt tube is arranged between any two of the three middle battery cell columns.

[0008] In some optional embodiments, the first liquid outlet and / or the second liquid inlet are discretely arranged along the first direction.

[0009] In some optional embodiments, the first liquid outlet includes a plurality of liquid outlet holes arranged at intervals along the first direction, each liquid outlet hole is long and extends along a third direction, the third direction is perpendicular to the first direction and the second direction, and the plurality of liquid outlet holes respectively correspond to the cooling channels of adjacent battery cell columns, and the lengths of the plurality of liquid outlet holes gradually increase from one end to the other end of the liquid inlet shunt tube.

[0010] In some optional embodiments, the second liquid inlet includes a plurality of liquid inlet holes arranged at intervals along the first direction, each liquid inlet hole is long and extends along a third direction, the third direction is perpendicular to the first direction and the second direction, and the plurality of liquid inlet holes respectively correspond to the cooling channels of adjacent battery cell columns, and the lengths of the plurality of liquid inlet holes gradually increase from one end to the other end of the reflux section.

[0011] In some optional embodiments, the first liquid outlet and / or the second liquid inlet are arranged continuously along the first direction.

[0012] In some optional embodiments, the first liquid outlet includes a plurality of liquid outlet holes arranged at intervals along a third direction, the third direction is perpendicular to the first direction and the second direction, each liquid outlet hole is long and extends along the first direction, and the plurality of liquid outlet holes as a whole cover the cooling channels of adjacent battery cell columns in the first direction, the lengths of the plurality of liquid outlet holes gradually decrease from top to bottom in the third direction, and the covering widths of the plurality of liquid outlet holes in the third direction gradually increase from one end to the other end of the liquid inlet diversion pipe, and each stage corresponds to a liquid outlet hole.

[0013] In some optional embodiments, the second liquid inlet includes a plurality of liquid inlet holes arranged at intervals along a third direction, the third direction is perpendicular to the first direction and the second direction, each liquid inlet hole is long and extends along the first direction, and the plurality of liquid inlet holes as a whole cover all cooling channels of adjacent battery cell columns in the first direction, the length of the plurality of liquid inlet holes gradually decreases from top to bottom in the third direction, and the coverage width of the plurality of liquid inlet holes in the third direction increases step by step from one end to the other end of the reflux section, and each stage corresponds to a liquid inlet hole.

[0014] In some optional embodiments, the first liquid inlet and / or the second liquid outlet is a joint structure extending to the outside of the box.

[0015] Based on the above technical solution, the immersion liquid-cooled battery pack provided by the present application can be provided with cooling channels every at least one battery cell gap, which reduces the coolant filling area and reduces the amount of coolant used; by optimizing the layout of the liquid inlet diverter pipe and the return manifold, it is ensured that the coolant can be distributed to the battery cell columns on both sides, thereby improving space utilization and cooling efficiency; the area change design of the first liquid outlet of the liquid inlet diverter pipe and the second liquid inlet of the return manifold ensures that the coolant flow in each cooling channel of the battery cell column is balanced, avoiding overcooling or overheating of some blade batteries, significantly improving the thermal management uniformity of the battery pack, and providing a guarantee for the efficient and stable operation of the blade battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application.

[0018] Figure 2 A schematic diagram of an explosion of an immersion liquid-cooled battery pack provided in an embodiment of the present application.

[0019] Figure 3 A schematic structural diagram of a cooling channel provided in an embodiment of the present application.

[0020] Figure 4 A schematic diagram of the layout of a cooling channel provided in an embodiment of the present application.

[0021] Figure 5 A schematic diagram of another cooling channel arrangement provided in an embodiment of the present application.

[0022] Figure 6 A schematic structural diagram of a liquid inlet shunt pipe provided in an embodiment of the present application.

[0023] Figure 7 A schematic structural diagram of another liquid inlet shunt pipe provided in an embodiment of the present application.

[0024] Figure 8 A schematic structural diagram of a return manifold provided in an embodiment of the present application.

[0025] Figure 9 A schematic structural diagram of another return manifold provided in an embodiment of the present application.

[0026] Figure numerals: 1, coolant; 100, battery pack; 10, box; 20, blade battery cell; 30, liquid inlet diverter pipe; 31, first liquid inlet; 32, first liquid outlet; 321A, liquid outlet hole; 321B, liquid outlet hole; 33, first groove; 40, reflux manifold; 41, reflux section; 42, converging section; 421, second groove; 43, second liquid inlet; 431A, liquid inlet hole; 432B, liquid inlet hole; 44, second liquid outlet; 50, flow channel limit strip. DETAILED DESCRIPTION

[0027] Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only a portion of the embodiments of the present application, and not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the description of this application without inventive effort are intended to fall within the scope of protection of this application.

[0028] In the description of this application, unless otherwise specified or limited, the terms "connect," "dispose," and "install" should be understood broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can mean that two components are internally connected. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] The terms "upper", "lower", "left", "right", "front", "back", "center", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when used. They are only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present application.

[0030] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order, unless expressly specified and limited otherwise.

[0031] The terms "comprises," "includes," "has," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of more limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0032] The term "plurality" means two or more (including two).

[0033] The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0034] The terms "one embodiment," "as an example," "in one implementation," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example may be included in at least one embodiment or example of the present application. The schematic representations of such terms do not necessarily refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments. The embodiments and features within the embodiments of the present application may be combined in appropriate ways unless there is a conflict.

[0035] Figure 1 This is a schematic structural diagram of an immersion liquid-cooled battery pack 100 provided in an embodiment of the present application. Figure 2 An exploded diagram of an immersion liquid-cooled battery pack 100 provided in an embodiment of the present application is shown in FIG. Figure 1 and Figure 2 As shown, the embodiment of the present application provides an immersion liquid-cooled battery pack 100, including a housing 10, blade cells 20, cooling channels (not shown), a liquid inlet manifold 30, and a return manifold 40. Each component is described in detail below.

[0036] The box body 10 is a rectangular box body 10, which is used to provide structural support and protection for the entire battery pack 100. The box body 10 is made of high-strength, corrosion-resistant metal materials, such as aluminum alloy. This material not only has good mechanical properties and can withstand certain external impacts and vibrations, protecting the internal blade battery cells 20 and other components from damage, but also has good thermal conductivity, which helps to dissipate heat. The sealing performance of the box body 10 reaches the IP67 protection level, which can effectively prevent the intrusion of dust and water, and ensure that the battery pack 100 can operate stably in various harsh environments. The top of the box body 10 is provided with an openable cover (not shown in the figure) to facilitate the installation, inspection and maintenance of internal components.

[0037] There are multiple battery cell rows in the box 10, each battery cell row includes multiple blade batteries 20 arranged along a first direction, and multiple battery cell rows are arranged along a second direction, which is perpendicular to the first direction. Figure 1 and Figure 2 As shown, two rows of cells are arranged within the housing 10. Blade cells 20 feature high energy density and a compact size. Compared to other cells, they can accommodate more cells within the same space, improving the energy density of the battery pack 100. The first and second directions correspond to the thickness and length of the blade cells 20, respectively, which are also the length and width of the housing 10.

[0038] In each battery cell column, there is a battery cell gap between two adjacent blade battery cells 20 , and a cooling channel is provided in each battery cell gap or every at least one battery cell gap.

[0039] Figure 3A schematic diagram of a cooling channel structure provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, each cooling channel is composed of a plurality of channel limiting strips 50, each channel limiting strip 50 extends along the second direction and is connected to the surface of the blade battery cell 20, and the plurality of channel limiting strips 50 are arranged at intervals in the second direction and the third direction, and the third direction is perpendicular to the first direction and the second direction. Among them, the third direction corresponds to the width direction of the blade battery cell 20, that is, the height direction of the box body 10. The channel limiting strip 50 has the following functions: 1. It plays a limiting role in the assembly of the blade battery cell 20, ensuring the size of the battery cell gap; 2. It plays a limiting role in the expansion of the blade battery cell 20, which can prevent the battery cell gap from being flattened and unable to form a cooling channel; 3. It plays a disturbing and guiding role in the flow of the coolant, which can improve the heat exchange efficiency, optimize the flow path, and thus reduce the temperature difference between the battery cells.

[0040] Regarding the arrangement of cooling channels, as an example, Figure 4 A schematic diagram of the arrangement of a cooling channel provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, in each battery cell column, a cooling channel is provided in each battery cell gap. Each cooling channel is composed of a plurality of channel limiting strips 50. When in operation, coolant flows in the cooling channel.

[0041] As another example, Figure 5 Another schematic diagram of the arrangement of cooling channels provided in the embodiment of the present application is shown in FIG. Figure 5 As shown, in each battery cell row, cooling channels are provided between every other battery cell. Each cooling channel is composed of multiple channel limiting strips 50. During operation, coolant flows through the cooling channel. Thermally conductive structural adhesive (not shown) can be provided in the gaps between the battery cells where no cooling channels are provided. The thermally conductive structural adhesive not only ensures a firm connection between the blade battery cells 20, but also has excellent thermal conductivity.

[0042] Figure 6 This is a structural diagram of a liquid inlet shunt pipe 30 provided in an embodiment of the present application, as shown in FIG. Figure 1 、 Figure 2 and Figure 6As shown, the liquid inlet shunt pipe 30 is arranged near the central area of the entire plurality of battery cell rows, and is used to distribute the coolant supplied by the external cooling system to the cooling channels of the battery cell rows on both sides. Specifically, the liquid inlet shunt pipe 30 extends along the first direction, and a first liquid inlet 31 is provided at one end thereof, and the other end is closed; the liquid inlet shunt pipe 30 has two side surfaces opposite to each other in the second direction, and both of these side surfaces are provided with a first liquid outlet 32, so that the coolant can flow out from both sides of the liquid inlet shunt pipe 30. Among them, the first liquid outlet 32 on each side is arranged along the first direction, and its area gradually increases from one end to the other end of the liquid inlet shunt pipe 30 (including continuous and smooth increase and segmented step-by-step increase). This design ensures that the coolant can be reasonably distributed to the various cooling channels of the battery cell rows on both sides, and ensures that the coolant flow in the various cooling channels of the battery cell rows on both sides is balanced.

[0043] Regarding the setting of the first liquid inlet 31, as an example, Figure 6 As shown, the first liquid inlet 31 adopts a connector structure with an end extending therefrom. The connector passes through a hole provided on the box body 10 and extends to the outside, so that it can be directly connected to an external cooling system.

[0044] As another example, Figure 3 As shown, the first liquid inlet 31 adopts a structure with a completely open end. For this design, a special coolant inlet connector (not shown in the figure) is installed on the box body 10, and the coolant inlet connector is used to connect the liquid inlet shunt pipe 30 with the external cooling system.

[0045] Regarding the arrangement of the first liquid outlets 32, the first liquid outlets 32 may be discretely arranged along the first direction. For example, Figure 6 As shown, the first liquid outlet 32 includes a plurality of liquid outlet holes 321A arranged at intervals along the first direction, each liquid outlet hole 321A is long and extends along the third direction, and the plurality of liquid outlet holes 321A respectively correspond to the respective cooling channels of the adjacent battery cell columns, and the length of the plurality of liquid outlet holes 321A gradually increases from one end to the other end of the liquid inlet shunt tube 30.

[0046] The first liquid outlets 32 may also be arranged continuously along the first direction. For example, Figure 7 As shown, the first liquid outlet 32 includes a plurality of liquid outlet holes 321B arranged at intervals along the third direction, each liquid outlet hole 321B is long and extends along the first direction, and the plurality of liquid outlet holes 321B as a whole cover all cooling channels of adjacent battery cell columns in the first direction, the length of the plurality of liquid outlet holes 321B gradually decreases from top to bottom in the third direction, and the coverage width of the plurality of liquid outlet holes 321B in the third direction increases step by step from one end to the other end of the liquid inlet diverter tube 30, and each level corresponds to a liquid outlet hole 321B.

[0047] Regarding the position of the liquid inlet shunt tube 30: when the number of battery cell rows is an even number, the liquid inlet shunt tube 30 is arranged between the two middle battery cell rows; when the number of battery cell rows is an odd number greater than 1, the liquid inlet shunt tube 30 is arranged between any two of the three middle battery cell rows, and the first liquid outlets 32 on the two sides of the liquid inlet shunt tube 30 will have certain differences, such as differences in area, so as to adjust the outflow rate of the coolant on both sides, thereby ensuring that the coolant distribution on both sides of the liquid inlet shunt tube 30 in the box body 10 reaches a balanced state.

[0048] Figure 8 A schematic diagram of the structure of a return manifold 40 provided in an embodiment of the present application is shown in FIG. Figure 1 、 Figure 2 and Figure 8 As shown, the return manifold 40 includes two return sections 41 and a confluence section 42. The two return sections 41 are respectively located on both sides of the plurality of battery cell columns as a whole in the second direction, and are used to collect the coolant flowing out of the cooling channels of adjacent battery cell columns. The confluence section 42 connects the two return sections 41, and is used to collect the coolant in the two return sections 41 and guide it back to the external cooling system.

[0049] Each return section 41 extends along a first direction, with one end connected to the confluence section 42 and the other end sealed. A second liquid inlet 44 is provided on the side of the return section 41 adjacent to the cell array. This second liquid inlet 44 corresponds to the first liquid outlet 32 of the liquid inlet manifold 30. Specifically, the second liquid inlet 44 is arranged along the first direction, and its area gradually increases from one end of the return section 41 to the other. This design allows the coolant flowing out of the cooling channels of adjacent cell arrays to be evenly collected in the return section 41, ensuring a balanced flow of coolant during the collection process.

[0050] Regarding the arrangement of the second liquid inlet 44, the second liquid inlet 44 can be arranged discretely along the first direction. As an example, Figure 8 As shown, the second liquid inlet 44 includes a plurality of liquid inlet holes 431A arranged at intervals along the first direction, each liquid inlet hole 431A is long and extends along the third direction, and the plurality of liquid inlet holes 431A respectively correspond to the respective cooling channels of adjacent battery cell columns, and the lengths of the plurality of liquid inlet holes 431A gradually increase from one end to the other end of the reflux section 41.

[0051] The second liquid inlets 44 can also be arranged continuously along the first direction. For example, Figure 9As shown, the second liquid inlet 44 includes a plurality of liquid inlet holes 431B arranged at intervals along the third direction, each liquid inlet hole 431B is long and extends along the first direction, and the plurality of liquid inlet holes 431B as a whole cover all cooling channels of adjacent battery cell columns in the first direction, the length of the plurality of liquid inlet holes 431B gradually decreases from top to bottom in the third direction, and the coverage width of the plurality of liquid inlet holes 431B in the third direction increases step by step from one end to the other end of the reflux section 41, and each level corresponds to a liquid inlet hole 431B.

[0052] like Figure 1 、 Figure 2 and Figure 8 As shown, the confluence section 42 is arranged at one end of the multiple battery cell columns and extends along the second direction. The two ends of the confluence section 42 are respectively connected to one end of the two return sections 41. A second liquid outlet 44 is provided in the middle of the confluence section 42.

[0053] Regarding the arrangement of the second liquid outlet 44, as an example, Figure 8 As shown, the second liquid outlet 44 adopts a joint structure extending along the third direction. The joint passes through a hole opened on the box body 10 and extends to the outside, so that it can be directly connected to an external cooling system.

[0054] As another example, the second liquid outlet 44 adopts a structure with an opening on the side of the confluence section 42. For this design, a special coolant outlet connector (not shown in the figure) is installed on the box body 10, and the return confluence pipe 40 is connected to the external cooling system through the coolant outlet connector.

[0055] It should be noted that, since the return manifold 40 is adjacent to the inner wall of the box body 10 , the return manifold 40 and the box body 10 can be integrally formed, which can reduce the number of components, optimize the internal space of the box body 10 , and improve space utilization.

[0056] In addition, since the first liquid inlet 31 of the liquid inlet shunt pipe 30 and the second liquid outlet 44 of the return manifold 40 are usually arranged in a centralized manner, the liquid inlet shunt pipe 30 and the return manifold 40 may cause structural interference during assembly. To solve this problem, as an example, Figure 6 and Figure 8 As shown, one end of the liquid inlet diversion pipe 30 and the middle of the converging section 42 are respectively provided with a first groove 33 and a second groove 421 that avoid each other.

[0057] When the immersion liquid-cooled battery pack 100 is working, the flow path of the coolant is as follows: the coolant supplied by the external cooling system flows into the liquid inlet shunt pipe 30 through the first liquid inlet 31, and then flows from the first liquid outlet 32 on the two sides of the liquid inlet shunt pipe 30 to the cooling channels of each battery cell row on both sides. The coolant flowing out of the cooling channels of the battery cell rows on the two sides in the second direction flows into the two reflux sections 41 of the reflux manifold 40 through the second liquid inlet 44, and is gathered through the merging section 42, and finally flows back to the external cooling system through the second liquid outlet 44, realizing the circulation of the coolant.

[0058] In summary, in the immersed liquid-cooled battery pack provided in the embodiment of the present application, cooling channels can be set every at least one battery cell gap, which reduces the coolant filling area and reduces the amount of coolant used; by optimizing the layout of the liquid inlet diverter pipe and the return manifold, it is ensured that the coolant can be distributed to the battery cell rows on both sides, thereby improving space utilization and cooling efficiency; the area change design of the first liquid outlet of the liquid inlet diverter pipe and the second liquid inlet of the return manifold ensures that the coolant flow in each cooling channel of the battery cell row is balanced, avoiding overcooling or overheating of some blade batteries, significantly improving the thermal management uniformity of the battery pack, and providing a guarantee for the efficient and stable operation of the blade battery system.

[0059] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the field can easily think of various changes or replacements within the technical scope disclosed in the present application, which should all be included in the scope of protection of the present application.

Claims

1. An immersion liquid-cooled battery pack, characterized in that: include: Box; A plurality of cell rows, each of the cell rows comprising a plurality of blade cells arranged along a first direction, a cell gap being formed between adjacent blade cells, a cooling channel being provided in each cell gap or every at least one cell gap, and the plurality of cell rows being arranged in the housing along a second direction, the second direction being perpendicular to the first direction; a liquid inlet shunt pipe, arranged near the center area of the plurality of battery cell arrays as a whole, the liquid inlet shunt pipe extending along the first direction and having a first liquid inlet at one end and a closed end, and first liquid outlets at two opposite sides of the liquid inlet shunt pipe in the second direction; and a reflux manifold, comprising two reflux sections and a converging section, the two reflux sections being located on both sides of the plurality of battery cell arrays in the second direction, each reflux section extending along the first direction and having one end connected to the converging section and the other end closed, each reflux section being provided with a second liquid inlet, and the converging section being provided with a second liquid outlet; Among them, the first liquid outlet and the second liquid inlet both correspond to the cooling channels of the adjacent battery cell columns, and the areas of the first liquid outlet and the second liquid inlet both gradually increase from one end of the liquid inlet shunt pipe to the other end, so as to achieve the balance of the coolant flow in each of the cooling channels of the battery cell columns.

2. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The cooling channel is composed of a plurality of channel limiting strips, each of which extends along the second direction and is connected to the blade battery cell. The plurality of channel limiting strips are arranged at intervals in the second direction and the third direction, and the third direction is perpendicular to the first direction and the second direction.

3. The immersion liquid-cooled battery pack according to claim 1, characterized in that: When the number of the battery cell rows is an even number, the liquid inlet shunt tube is arranged between the two middle battery cell rows; when the number of the battery cell rows is an odd number greater than 1, the liquid inlet shunt tube is arranged between any two of the three middle battery cell rows.

4. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The first liquid outlet and / or the second liquid inlet are discretely arranged along the first direction.

5. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The first liquid outlet includes a plurality of liquid outlet holes arranged at intervals along the first direction, each of the liquid outlet holes is long and extends along a third direction, the third direction is perpendicular to the first direction and the second direction, and the plurality of liquid outlet holes respectively correspond to the cooling channels of adjacent battery cell columns, and the lengths of the plurality of liquid outlet holes gradually increase from one end of the liquid inlet shunt pipe to the other end.

6. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The second liquid inlet includes a plurality of liquid inlet holes arranged at intervals along the first direction, each of the liquid inlet holes is long and extends along a third direction, the third direction is perpendicular to the first direction and the second direction, and the plurality of liquid inlet holes respectively correspond to the cooling channels of adjacent battery cell columns, and the lengths of the plurality of liquid inlet holes gradually increase from one end to the other end of the reflux section.

7. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The first liquid outlet and / or the second liquid inlet are arranged continuously along the first direction.

8. The immersion liquid-cooled battery pack according to claim 7, characterized in that: The first liquid outlet includes a plurality of liquid outlet holes arranged at intervals along a third direction, the third direction being perpendicular to the first direction and the second direction, each of the liquid outlet holes being in a long strip shape and extending along the first direction, and the plurality of liquid outlet holes as a whole covering the cooling channels of the adjacent battery cell columns in the first direction, the lengths of the plurality of liquid outlet holes gradually decreasing from top to bottom in the third direction, and the covering widths of the plurality of liquid outlet holes in the third direction gradually increasing from one end to the other end of the liquid inlet shunt pipe, with each stage corresponding to one liquid outlet hole.

9. The immersion liquid-cooled battery pack according to claim 7, characterized in that: The second liquid inlet includes a plurality of liquid inlet holes arranged at intervals along a third direction, the third direction being perpendicular to the first direction and the second direction, each of the liquid inlet holes being in the shape of an elongated strip and extending along the first direction, and the plurality of liquid inlet holes as a whole covering all cooling channels of adjacent battery cell columns in the first direction, the lengths of the plurality of liquid inlet holes gradually decreasing from top to bottom in the third direction, and the covering widths of the plurality of liquid inlet holes in the third direction gradually increasing from one end to the other end of the reflux section, and each stage corresponding to a liquid inlet hole.

10. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The first liquid inlet and / or the second liquid outlet is a joint structure extending to the outside of the box.

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