Battery pack

Abstract

The application discloses a battery pack, and belongs to the technical field of batteries. The battery pack comprises a battery group, a first longitudinal beam, a second longitudinal beam and a top plate. The battery group is arranged by a plurality of single batteries along a first direction. The first longitudinal beam and the second longitudinal beam are arranged on two sides and have a gap. The top plate is sealingly connected and has a gap. The three components and the battery group form a first immersion flow channel. The first longitudinal beam has a first liquid inlet, and the second longitudinal beam has a first liquid outlet. The cooling medium is exchanged by the flow channel. The application utilizes the assembly gap between the first longitudinal beam, the second longitudinal beam, the top plate and the battery group to form the first immersion flow channel. Without additional complex cooling structure, direct immersion cooling of the battery group is realized in limited space, and the problem that space limitation and efficient heat dissipation cannot be considered together is effectively solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the heat dissipation problem of power batteries under high-rate (10C+) charging and discharging is becoming increasingly prominent. Traditional air cooling and liquid cooling are insufficient to meet the requirements, while immersion cooling, although highly efficient, is limited by energy density requirements and structural space, making it impossible to achieve both compact layout and efficient heat dissipation. Summary of the Invention

[0003] This application provides a battery pack designed to solve the technical problem of achieving efficient heat dissipation within a limited space.

[0004] Technical solution: This application provides a battery pack, including: The battery pack includes multiple individual cells arranged sequentially along a first direction; The first longitudinal beam is located on one side of the battery pack in the second direction and is spaced apart from the battery pack; The second longitudinal beam is located on the side of the battery pack away from the first longitudinal beam and is spaced apart from the battery pack; A top plate is spaced apart on one side of the battery pack facing the third direction, and the top plate, the first longitudinal beam, the second longitudinal beam, and the battery pack form a first immersion channel; The first longitudinal beam has a first liquid inlet, the second longitudinal beam has a first liquid outlet, and the cooling medium can flow sequentially through the first liquid inlet, the first immersion channel and the first liquid outlet; The first direction, the second direction, and the third direction intersect each other.

[0005] In some embodiments, the battery pack further includes a first cold plate having a first flow channel through which the cooling medium flows, the first cold plate being disposed on the side of the battery pack away from the top plate, and the first cold plate being connected to the first longitudinal beam, the second longitudinal beam, and the battery pack respectively.

[0006] In some embodiments, a plurality of battery packs are disposed between the first longitudinal beam and the second longitudinal beam, spaced apart along the second direction; the top plate, the first longitudinal beam, the second longitudinal beam, and the plurality of battery packs form the first immersion channel; The battery pack also includes a plurality of second cold plates, with the second cold plates sandwiched between two adjacent battery packs, and the second cold plates having a second flow channel through which the cooling medium flows.

[0007] In some embodiments, the second flow channel includes: The first sub-channel extends along the first direction; The second sub-channel extends along the third direction and is located at the end of the second cold plate away from the first liquid inlet. The second sub-channel is connected to the first sub-channel. The third sub-channel is spaced apart from the first sub-channel along the third direction and is connected to the second sub-channel.

[0008] In some embodiments, the battery pack further includes: The first inlet transfer pipe has one end connected to the first flow channel, and the other end of the first inlet transfer pipe passes through multiple second cold plates in sequence and is connected to multiple first sub-flow channels respectively. The first outlet transfer pipe has one end connected to the first flow channel, and the other end of the first outlet transfer pipe passes through multiple second cold plates in sequence and is connected to multiple third sub-flow channels respectively.

[0009] In some embodiments, the battery pack further includes: The inlet pipe is connected to the first liquid inlet and the first flow channel respectively, and the inlet pipe is connected to the first inlet transfer pipe through the first flow channel; The first outlet pipeline is connected to the first liquid outlet and the first flow channel respectively, and the first outlet pipeline is connected to the first outlet transfer pipeline through the first flow channel. The cooling medium can flow sequentially through the inlet pipe, the first flow channel, the first inlet transfer pipe, multiple second flow channels, the first outlet transfer pipe, the first flow channel, and the first outlet pipe.

[0010] In some embodiments, the first longitudinal beam has a plurality of first outlets, and the plurality of first outlets are respectively connected to the inner cavity of the first longitudinal beam and the first immersion channel. The second longitudinal beam has multiple first inlets, which are connected to the inner cavity of the second longitudinal beam and the first immersion channel, and the inner cavity of the second longitudinal beam is connected to the first liquid outlet.

[0011] In some embodiments, the battery pack further includes a third longitudinal beam disposed on the side of the first longitudinal beam away from the second longitudinal beam and connected to the top plate. At least one battery pack is disposed between the third longitudinal beam and the first longitudinal beam, and the third longitudinal beam is spaced apart from the battery pack. The third longitudinal beam has a second liquid outlet. The top plate, the first longitudinal beam, and the third longitudinal beam form a second immersion channel with the battery pack, and the cooling medium can flow sequentially through the first inlet, the second immersion channel, and the second outlet.

[0012] In some embodiments, the battery pack further includes a second outlet pipe, which is connected to the second liquid outlet and the first flow channel.

[0013] In some embodiments, the first longitudinal beam is further provided with a plurality of second outlets, which are respectively connected to the inner cavity of the first longitudinal beam and the second immersion channel; The third longitudinal beam has multiple second inlets, which are respectively connected to the inner cavity of the third longitudinal beam and the second immersion channel.

[0014] In some embodiments, when multiple battery packs are disposed between the first longitudinal beam and the third longitudinal beam, a second cold plate is sandwiched between two adjacent battery packs, and a second immersion channel is formed between the top plate, the first longitudinal beam, the third longitudinal beam, and the multiple battery packs.

[0015] In some embodiments, the battery pack further includes: The second inlet transfer pipe has one end connected to the first flow channel and the second inlet transfer pipe connected to the inlet pipe through the first flow channel. The other end of the second inlet transfer pipe passes through multiple second cold plates between the first longitudinal beam and the third longitudinal beam and is connected to the first sub-flow channels of the multiple second cold plates respectively. The second outlet transfer pipe has one end connected to the first flow channel, and the other end of the second outlet transfer pipe passes through multiple second cold plates between the first longitudinal beam and the third longitudinal beam, and is connected to the third sub-flow channels of the multiple second cold plates respectively.

[0016] One of the beneficial effects of the embodiments of this application is as follows: The battery pack provided in this embodiment includes a battery pack, a first longitudinal beam, a second longitudinal beam, and a top plate. The battery pack consists of multiple individual cells arranged along a first direction X. The first and second longitudinal beams are located on opposite sides with gaps, and the top plate is sealed and connected with a gap. These three components, together with the battery pack, form a first immersion channel. The first longitudinal beam has a first liquid inlet, and the second longitudinal beam has a first liquid outlet. The cooling medium exchanges heat through the channel. This embodiment utilizes the assembly gaps between the first and second longitudinal beams, the top plate, and the battery pack to form the first immersion channel, eliminating the need for additional complex cooling structures and achieving direct immersion cooling of the battery pack within a limited space. The cooling medium is in full contact with the surface of the battery pack, quickly removing heat and preventing localized hot spots inside the battery pack, resulting in a more uniform temperature distribution among the individual cells. This effectively solves the problem of balancing space constraints and efficient heat dissipation while meeting the heat dissipation requirements of high-rate charging and discharging.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in an exemplary embodiment of this disclosure; Figure 2 This is a cross-sectional view of the battery pack provided in an exemplary embodiment of this disclosure from one angle. Figure 3 This is a schematic diagram of the internal structure of the battery pack provided in an exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of the structure of the first cold plate provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic cross-sectional view of the second cold plate provided in an exemplary embodiment of this disclosure; Figure 6 yes Figure 3 Enlarged view of a portion of point A in the middle; Figure 7 This is a cross-sectional view of the battery pack provided in an exemplary embodiment of this disclosure from another angle; Figure 8 yes Figure 7 Summarize the enlarged view of section B; Figure 9 This is a schematic diagram of the structure of the housing of the battery pack provided in an exemplary embodiment of this disclosure.

[0021] Explanation of reference numerals in the attached figures: X - First direction; Y - Second direction; Z - Third direction; 100 - Battery pack; 110 - Individual cell; 200 - First longitudinal beam; 210 - First liquid inlet; 220 - First outlet; 230 - Second outlet; 300 - Second longitudinal beam; 310 - First liquid outlet; 320 - First inlet; 400-Top plate; 500 - First cold plate; 510 - Plate body; 520 - First flow channel; 521 - First branch flow channel; 522 - Cooling flow channel; 523 - Second branch flow channel; 600 - First immersion channel; 610 - Second immersion channel; 700 - Third longitudinal beam; 710 - Second liquid outlet; 720 - Second inlet; 800 - Inlet Piping; 900 - First outlet pipeline; 1000 - Second outlet pipeline; 2000 - Second cold plate; 2100 - Second flow channel; 2110 - First sub-flow channel; 2120 - Second sub-flow channel; 2130 - Third sub-flow channel; 3000 - First Import Transfer Pipeline; 4000 - First Exit Pipeline Transfer; 5000 - Second import transfer pipeline; 6000 - Second Exit Pipeline Transfer; 8000-Module Endplate; 9000 - Crossbeam. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. Furthermore, although the terms "first," "second," etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes all combinations of any one and more of the associated listed items.

[0024] In the description of this application, "multiple" means two or more, and "at least one" means one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or nearly completely perpendicular, for example, an angle of 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or nearly completely parallel, for example, a perfectly parallel angle of 10° is considered parallel.

[0025] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrows labeled X, Y, and Z respectively represent the first direction X, the second direction Y, and the third direction Z. The description of this application introduces the first direction X, the second direction Y, and the third direction Z to more clearly express the relative positional relationship involved in the battery pack in this application. The first direction X, the second direction Y, and the third direction Z are three intersecting relative directions, not absolute directions. In practical applications, the first direction X, the second direction Y, and the third direction Z can point to any direction in space, as long as the intersection relationship between them is maintained.

[0026] In some examples, the first direction X is the direction in which multiple individual cells 110 are arranged in a single battery pack 100, the second direction Y is the direction in which multiple longitudinal beams are arranged in the battery pack housing, and the third direction Z is the height direction of the battery pack, which is also the thickness direction of the battery pack.

[0027] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0028] With the rapid development of new energy vehicles and energy storage systems, the heat dissipation problem of power batteries and battery modules is becoming increasingly prominent. Traditional heat dissipation methods such as air cooling and liquid cooling are insufficient to meet the requirements of high-rate (10C+) charging and discharging and high energy density, easily leading to uneven battery temperature distribution, affecting its performance and lifespan. Immersion cooling, as an efficient cooling method, can significantly improve heat dissipation capacity, but battery packs are limited by energy density requirements, and the internal structural space is extremely limited, making it difficult to arrange additional complex cooling structures, thus making it impossible to simultaneously achieve a compact layout and efficient heat dissipation. How to design an efficient heat exchange immersion cooling system within a limited space, while reducing the amount of cooling oil added, has become an urgent technical problem to be solved.

[0029] In view of this, embodiments of this application provide a battery pack to solve at least part of the above-mentioned technical problems.

[0030] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, a battery pack includes a battery pack 100, a first longitudinal beam 200, a second longitudinal beam 300, and a top plate 400.

[0031] The battery pack 100 is composed of multiple individual cells 110 arranged sequentially along a first direction X. The individual cell 110 is the basic unit for storing and releasing electrical energy in the battery pack. Multiple individual cells 110 arranged in a certain direction form the battery pack 100 to provide the required voltage and capacity. The overall arrangement of the battery pack 100 determines the energy density and heat dissipation requirements of the battery pack.

[0032] The first longitudinal beam 200 is located on one side of the battery pack 100 in the second direction Y, and is spaced apart from the battery pack 100, meaning there is a gap between the first longitudinal beam 200 and the battery pack 100. The first longitudinal beam 200 is a supporting structural component of the battery pack, used to bear mechanical loads and fix the position of the battery pack 100. The gap between the first longitudinal beam 200 and the battery pack 100 provides a flow channel for the cooling medium.

[0033] The second longitudinal beam 300 is located on the side of the battery pack 100 away from the first longitudinal beam 200, and is spaced apart from the battery pack 100, meaning there is a gap between the second longitudinal beam 300 and the battery pack 100. The second longitudinal beam 300 also serves a supporting and fixing function, and together with the first longitudinal beam 200, defines the boundary of the battery pack 100 in the second direction Y. The gap between the second longitudinal beam 300 and the battery pack 100 also serves as a flow channel for the cooling medium.

[0034] The top plate 400 is spaced apart on one side of the battery pack 100 in the third direction Z (e.g., the top), meaning there is a gap between the top plate 400 and the battery pack 100. The top plate 400 is the upper cover of the battery pack, used to enclose the battery pack and protect the internal components, and the top plate 400 is sealed to the first longitudinal beam 200 and the second longitudinal beam 300. The gap between the top plate 400 and the battery pack 100 provides upward flow space for the cooling medium.

[0035] The top plate 400, the first longitudinal beam 200, and the second longitudinal beam 300, together with the battery pack 100, form a first immersion channel 600. The gaps between the first longitudinal beam 200 and the battery pack 100, the gaps between the second longitudinal beam 300 and the battery pack 100, and the gaps between the top plate 400 and the battery pack 100 collectively constitute the first immersion channel 600. The first immersion channel 600 is a closed cavity structure surrounding the sides and top of the battery pack 100, used to guide the cooling medium to flow across the surface of the battery pack 100. The formation of the first immersion channel 600 utilizes the existing assembly gaps within the battery pack, requiring no additional space.

[0036] A first liquid inlet 210 is provided on the first longitudinal beam 200, and the first liquid inlet 210 communicates with the inner cavity of the first longitudinal beam 200. The first liquid inlet 210 is the inlet for the cooling medium to enter the battery pack, and the inner cavity of the first longitudinal beam 200 serves as a space for temporarily storing and distributing the cooling medium. A first liquid outlet 310 is provided on the second longitudinal beam 300, and the first liquid outlet 310 communicates with the inner cavity of the second longitudinal beam 300. The first liquid outlet 310 is the outlet for the cooling medium to flow out of the battery pack, and the inner cavity of the second longitudinal beam 300 is used to collect the cooling medium after heat exchange.

[0037] The cooling medium (e.g., insulating cooling oil) is a non-conductive liquid with good thermal conductivity, used to absorb the heat generated by the battery pack 100. The cooling medium enters the inner cavity of the first longitudinal beam 200 through the first inlet 210, then flows into the first immersion channel 600, directly contacting and exchanging heat with each individual cell 110 in the battery pack 100. Because the cooling medium is in direct contact with the surface of the battery pack 100, the heat transfer efficiency is higher than that of indirect cooling methods. After heat exchange, the temperature of the cooling medium increases, and it continues to flow into the inner cavity of the second longitudinal beam 300, finally flowing out from the first outlet 310. This cycle is repeated to achieve immersion cooling of the battery pack 100.

[0038] As can be seen from the above technical solution, this embodiment utilizes the assembly gap between the first longitudinal beam 200, the second longitudinal beam 300, the top plate 400, and the battery pack 100 to form the first immersion channel 600. This eliminates the need for additional complex cooling structures, achieving direct immersion cooling of the battery pack 100 within a limited space. The cooling medium is in full contact with the surface of the battery pack 100, rapidly removing heat and preventing localized hot spots inside the battery pack 100, thus ensuring a more uniform temperature distribution among the individual cells 110. This satisfies the heat dissipation requirements of high-rate (10C+) charging and discharging while reducing the amount of cooling medium added, improving the energy density and cycle life of the battery pack, and effectively solving the problem of balancing space constraints with efficient heat dissipation.

[0039] In some embodiments, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 To further improve heat dissipation efficiency, the battery pack also includes a first cold plate 500.

[0040] The first cold plate 500 is a plate-type heat exchange component with an internal cooling medium channel. The function of the first cold plate 500 is to remove heat from the bottom of the battery pack 100 it contacts through the internally flowing cooling medium. The first cold plate 500 has a plate body 510, which is respectively attached to the battery pack 100, the first longitudinal beam 200, and the second longitudinal beam 300. It should be noted that the first cold plate 500 has a first flow channel 520, in which the cooling medium flows. The first flow channel 520 protrudes from the side of the plate body 510 away from the battery pack 100 (i.e., protrudes downwards). This protruding structure increases the contact area between the cooling medium and the plate body 510 while avoiding encroachment on the installation space of the battery pack 100. The first cold plate 500 is located on the side of the battery pack 100 away from the top plate 400 (i.e., the bottom), and the first cold plate 500 is fixedly connected to the first longitudinal beam 200, the second longitudinal beam 300, and the battery pack 100. Through this fixed connection, the first cold plate 500 provides structural support for the bottom of the battery pack 100, enhancing the overall rigidity of the battery pack. Furthermore, the first cold plate 500 is in direct contact with the bottom surface of the battery pack 100, enabling heat transfer from the bottom of the battery pack 100 to the cooling medium within the first flow channel 520 via thermal conduction, thus achieving auxiliary heat dissipation at the bottom. The connection between the first cold plate 500 and the first longitudinal beam 200 and the second longitudinal beam 300 fixes the battery pack 100, the first longitudinal beam 200, and the second longitudinal beam 300 into a unified whole, enhancing the structural strength of the battery pack and providing a flat support surface for the bottom of the battery pack 100.

[0041] like Figure 5As shown, the first flow channel 520 inside the first cold plate 500 can adopt a symmetrical flow channel arrangement, such as a serpentine flow channel, a parallel multi-branch flow channel, or a spiral flow channel, to achieve uniform coverage of the bottom surface of the battery pack 100 by the cooling medium from the bottom, ensuring uniform heat dissipation at the bottom. This embodiment does not limit the specific shape of the first flow channel 520, as long as it can achieve a symmetrical and uniform distribution.

[0042] like Figure 2 As shown, when multiple battery packs 100 arranged at intervals along the second direction Y are disposed between the first longitudinal beam 200 and the second longitudinal beam 300, these battery packs 100 together constitute a battery module. In this case, a first immersion channel 600 is formed between the top plate 400, the first longitudinal beam 200, the second longitudinal beam 300, and each battery pack 100 in the battery module. The cooling medium can flow through the first immersion channel 600 over the top surface of the multiple battery packs 100 in the battery module, the side facing the first longitudinal beam 200, and the side facing the second longitudinal beam 300, achieving immersion cooling of the entire battery module.

[0043] like Figure 2 and Figure 3 As shown, a second cold plate 2000 is sandwiched between two adjacent battery packs 100 in the battery module. The second cold plate 2000 is a flat plate-like component with a second flow channel 2100 inside for the flow of cooling medium. The function of the second cold plate 2000 is to cool the opposite sides of the two adjacent battery packs 100 in the battery module. The second cold plate 2000 is sandwiched between the two battery packs 100, and its two side surfaces are in close contact with the sides of the two battery packs 100 respectively. This sandwich structure allows the second cold plate 2000 to absorb the heat generated by the battery packs 100 on both sides simultaneously. The second cold plate 2000 has a second flow channel 2100 for the flow of cooling medium. When the cooling medium flows in the second flow channel 2100, it exchanges heat with the sides of the battery packs 100 through the plate wall of the second cold plate 2000, thereby carrying away heat. By adding a second cold plate 2000 (adjacent side contact cooling) to the first cold plate 500 (bottom cooling) and the first immersion channel 600 (top and two opposite side immersion cooling), a multi-faceted three-dimensional heat dissipation structure for the battery module is formed, which further improves the heat dissipation efficiency and is especially suitable for situations where multiple battery packs 100 are closely arranged in high-rate charging and discharging scenarios.

[0044] In some embodiments, please refer to Figure 6 The second flow channel 2100 includes a first sub-flow channel 2110, a second sub-flow channel 2120, and a third sub-flow channel 2130.

[0045] The first sub-channel 2110 is a channel extending along the first direction X inside the second cold plate 2000. The function of the first sub-channel 2110 is to guide the cooling medium from one end of the second cold plate 2000 to the other end, initially covering a portion of the side area of ​​the battery pack 100.

[0046] The second sub-channel 2120 is a channel extending in the third direction (Z) inside the second cold plate 2000, located at the end of the second cold plate 2000 furthest from the first liquid inlet 210 (i.e., the rear end). The function of the second sub-channel 2120 is to change the flow direction of the cooling medium, guiding the medium from the first sub-channel 2110 to another height position. The second sub-channel 2120 is connected to the first sub-channel 2110, allowing the cooling medium to change direction after reaching the far end of the second cold plate 2000.

[0047] The third sub-channel 2130 is another channel extending along the first direction X inside the second cold plate 2000. It is spaced vertically from the first sub-channel 2110 along the third direction Z (i.e., one is closer to the upper side of the second cold plate 2000, and the other is closer to the lower side). The function of the third sub-channel 2130 is to guide the cooling medium to flow back to the starting end of the second cold plate 2000 in the opposite direction, thereby exchanging heat on another part of the side of the battery pack 100. The third sub-channel 2130 is connected to the second sub-channel 2120.

[0048] Thus, the first sub-channel 2110, the second sub-channel 2120, and the third sub-channel 2130 are sequentially connected, forming a U-shaped or C-shaped loop. The cooling medium enters from the first sub-channel 2110, flows forward in the first direction X, turns after passing through the second sub-channel 2120, and then flows back in the opposite direction through the third sub-channel 2130. This U-shaped or C-shaped loop arrangement makes the flow path of the cooling medium inside the second cold plate 2000 longer, resulting in more thorough heat exchange with the sides of the battery pack 100. At the same time, the inlet and outlet liquids are distributed at different heights of the second cold plate 2000, facilitating the layered connection of external pipelines and avoiding pipeline interference. Through this structure, the second cold plate 2000 can efficiently exchange heat with the opposite sides of two adjacent battery packs 100, reducing the side temperature of the battery pack 100 and decreasing the internal temperature difference of the battery module.

[0049] In some embodiments, please refer to Figure 3 , Figure 4 and Figure 7To achieve cooling medium circulation between the second cold plate 2000 and the first cold plate 500, the battery pack is also equipped with a first inlet transfer pipe 3000 and a first outlet transfer pipe 4000. One end of the first inlet transfer pipe 3000 is connected to the first flow channel 520. Specifically, the first inlet transfer pipe 3000 passes through the plate body 510 and connects to the first flow channel 520. The other end of the first inlet transfer pipe 3000 sequentially passes through multiple second cold plates 2000 and connects to the first sub-flow channels 2110 of each of the multiple second cold plates 2000. One end of the first outlet transfer pipe 4000 is connected to the first flow channel 520. Specifically, the first outlet transfer pipe 4000 passes through the plate body 510 and connects to the first flow channel 520. The other end of the first outlet transfer pipe 4000 sequentially passes through multiple second cold plates 2000 and connects to the third sub-flow channels 2130 of each of the multiple second cold plates 2000.

[0050] In addition, the battery pack also includes an inlet pipe 800 and a first outlet pipe 900. The inlet pipe 800 is connected to the first liquid inlet 210 and the first flow channel 520, and is also connected to the first inlet transfer pipe 3000 via the first flow channel 520. The first outlet pipe 900 is connected to the first liquid outlet 310 and the first flow channel 520, and is also connected to the first outlet transfer pipe 4000 via the first flow channel 520.

[0051] It should be noted that the inlet pipe 800 is a tee pipe, with an external cooling medium source connected to the inlet. One outlet of the inlet pipe 800 is connected to the first liquid inlet 210, and the other outlet is connected to the inlet of the first flow channel 520. This means the cooling medium is split into two paths from the inlet pipe 800: one path leads through the first liquid inlet 210 to the inner cavity of the first longitudinal beam 200, and the other path leads to the first flow channel 520. The first flow channel 520 has a first branch flow channel 521, a cooling flow channel 522, and a second branch flow channel 523 that are interconnected. The first branch flow channel 521 is located near the connection between the first flow channel 520 and the inlet pipe 800, and is connected to both the inlet of the first flow channel 520 and the cooling flow channel 522. The second branch flow channel 523 is located near the connection between the first flow channel 520 and the first outlet pipe 900, and is connected to the outlet of the cooling flow channel 522. In other words, the first branch channel 521 is located near the inlet of the cooling channel 522, and the second branch channel 523 is located near the outlet of the cooling channel 522. The cooling channel 522 is used for heat exchange with the battery pack 100. The first outlet pipe 900 is a tee pipe. The outlet of the first outlet pipe 900 is connected to an external device or container that holds the heat-exchanged medium. One inlet of the first outlet pipe 900 is connected to the first liquid outlet 310, and the other inlet of the first outlet pipe 900 is connected to the outlet of the second branch channel 523.

[0052] The outlet of the inlet pipe 800, which connects to the first flow channel 520, delivers the cooling medium into the first branch flow channel 521 and the cooling flow channel 522. The first inlet transfer pipe 3000 connects to the outlet of the first branch flow channel 521, thereby receiving the cooling medium from the inlet pipe 800; that is, the inlet pipe 800 connects to the first inlet transfer pipe 3000 via the first branch flow channel 521 of the first flow channel 520. The first outlet transfer pipe 4000 connects to the inlet of the second branch flow channel 523, delivering the heat-exchanged medium to the second branch flow channel 523, where it merges with the medium that has exchanged heat from the cooling flow channel 522 through the second branch flow channel 523 and flows into the first outlet pipe 900. The first outlet pipe 900 is connected to the second branch channel 523, receiving the medium from the cooling channel 522 and the first outlet transfer pipe 4000, and discharging the medium together with the medium from the first liquid outlet 310. That is, the first outlet transfer pipe 4000 is connected to the first outlet pipe 900 through the second branch channel 523. In this way, the hot and cold media are naturally separated within the first channel 520 by the paths of the first branch channel 521, the cooling channel 522, and the second branch channel 523, preventing direct mixing of fresh cooling media with the heat-exchanged hot media and ensuring heat dissipation efficiency.

[0053] In this embodiment, the various pipelines and their joints can adopt aluminum alloy metal tees, cold plate pipeline joints, and PA12 material pipelines (PA12 material is oil-resistant and suitable for situations where the immersion liquid is mineral oil), etc. The connection method can be plastic pipe thermoforming or clamp connection; this embodiment does not specifically limit the connection method. The main feature of the flow path is that the inlet ends of multiple parallel cooling branches (e.g., the first inlet transfer pipeline 3000 and the second inlet transfer pipeline 5000 leading to the second cold plate 2000, etc.) are connected in parallel to each other, and all are connected to the outlet of the inlet pipeline 800; the outlet ends of these branches are also connected in parallel to each other, and are respectively connected to the corresponding outlet pipelines (first outlet pipeline 900 and second outlet pipeline 1000). Through this parallel structure, the flow rate of the cooling medium flowing through the second cold plate 2000 (used for side cooling of the battery pack 100) and the first cold plate 500 (used for bottom cooling of the battery pack 100) can be reasonably distributed, thereby ensuring the temperature uniformity of the battery pack 100.

[0054] In this embodiment, the complete flow path of the cooling medium is as follows: the cooling medium flows sequentially through the inlet pipe 800, the first branch channel 521 and cooling channel 522 of the first channel 520, the first inlet transfer pipe 3000, multiple second channels 2100 (the cooling medium flows sequentially through the first sub-channel 2110, the second sub-channel 2120, and the third sub-channel 2130), the first outlet transfer pipe 4000, the second branch channel 523 and the first outlet pipe 900, and finally flows out from the outlet of the first outlet pipe 900.

[0055] In some embodiments, please refer to Figure 2 , Figure 8 and Figure 9 The first longitudinal beam 200 has multiple first outlets 220. Each first outlet 220 is a connecting opening between the inner cavity of the first longitudinal beam 200 and the first immersion channel 600, located on the side wall of the first longitudinal beam 200 facing the second longitudinal beam 300, and at the lower part of the first longitudinal beam 200 (i.e., the side closest to the first cold plate 500). The function of the first outlets 220 is to disperse the cooling medium in the inner cavity of the first longitudinal beam 200 into multiple fine streams, which are then fed into the first immersion channel 600 from the lower part, enabling a certain degree of immersion cooling of the battery pack 100. The multiple first outlets 220 are spaced apart along the length direction (i.e., the first direction X) of the first longitudinal beam 200, allowing the cooling medium to enter the first immersion channel 600 simultaneously from multiple locations. To improve the effect of the cooling medium entering the first immersion channel 600 from multiple locations, a confluence chamber and a branch chamber can be provided within the first longitudinal beam 200. The cooling medium first enters the manifold, then flows from the multiple connecting ports between the manifold and the branching chamber to the branching chamber, and finally flows from the branching chamber to the first immersion channel 600 through multiple first outlets 220.

[0056] The second longitudinal beam 300 has multiple first inlets 320. Each first inlet 320 is a connecting opening between the inner cavity of the second longitudinal beam 300 and the first immersion channel 600, located on the side wall of the second longitudinal beam 300 facing the battery pack 100, and at the lower part of the second longitudinal beam 300 (i.e., the side closest to the first cold plate 500). The function of the first inlets 320 is to collect the cooling medium that has completed heat exchange in the first immersion channel 600 from multiple locations and guide it into the inner cavity of the second longitudinal beam 300. The multiple first inlets 320 are spaced apart along the length direction of the second longitudinal beam 300 (i.e., the first direction X), allowing the cooling medium in the first immersion channel 600 to flow out from multiple locations. To improve the effect of the cooling medium flowing into the inner cavity of the second longitudinal beam 300 from multiple locations, a flow distribution cavity and a flow collection cavity can be provided within the second longitudinal beam 300. The cooling medium enters the distribution chamber through multiple first inlets 320, then flows to the confluence chamber through multiple connecting ports between the distribution chamber and the confluence chamber, and finally exits from the confluence chamber through the first outlet 310.

[0057] The cooling medium enters the inner cavity of the first longitudinal beam 200 through the first inlet 210 (or first enters the confluence cavity of the first longitudinal beam 200 and then passes through the branch cavity of the first longitudinal beam 200), and is distributed to the first immersion channel 600 through multiple first outlets 220 at the bottom. The cooling medium flows over the surface of the battery pack 100 in the first immersion channel 600, absorbs heat, and then collects in the inner cavity of the second longitudinal beam 300 through multiple first inlets 320 (or first enters the branch cavity of the second longitudinal beam 300 and then passes through the confluence cavity of the second longitudinal beam 300), and finally exits from the first outlet 310. This distribution method, through the multiple first outlets 220 of the first longitudinal beam 200 and the multiple first inlets 320 of the second longitudinal beam 300, makes the distribution of the cooling medium in the first immersion channel 600 more uniform, reduces flow resistance, and reduces the temperature difference between each individual cell 110 in the battery pack 100.

[0058] In some embodiments, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The battery pack may also include a third longitudinal beam 700. The third longitudinal beam 700 is located on the side of the first longitudinal beam 200 away from the second longitudinal beam 300 and is sealed to the top plate 400. The third longitudinal beam 700 is a supporting structure similar to the first longitudinal beam 200 and the second longitudinal beam 300, used to fix the battery pack 100 and bear mechanical loads. At least one battery pack 100 is disposed between the third longitudinal beam 700 and the first longitudinal beam 200, and the third longitudinal beam 700 and the battery pack 100 are spaced apart, i.e., there is a gap between the third longitudinal beam 700 and the battery pack 100. A second immersion channel 610 is formed between the top plate 400, the first longitudinal beam 200, the third longitudinal beam 700, and the battery pack 100. The gap between the third longitudinal beam 700 and the battery pack 100 is a component of the second immersion channel 610, used for the flow of cooling medium. The third longitudinal beam 700 has a second liquid outlet 710, which is connected to the inner cavity of the third longitudinal beam 700 and is used to lead the cooling medium that has completed heat exchange out of the battery pack.

[0059] At this time, the second immersion channel 610 is a closed cavity structure located on the side of the first longitudinal beam 200 facing the third longitudinal beam 700. It is used to guide the cooling medium to flow over the top surface of the battery pack 100 on this side, the side facing the first longitudinal beam 200, and the side facing the third longitudinal beam 700. The second immersion channel 610 is independent of the first immersion channel 600 and is located on both sides of the first longitudinal beam 200.

[0060] The cooling medium flows sequentially through the first inlet 210, the second immersion channel 610, and the second outlet 710. Specifically, the cooling medium enters the inner cavity of the first longitudinal beam 200 from the first inlet 210. The inner cavity of the first longitudinal beam 200 is divided into two areas: one area supplies liquid to the first immersion channel 600, and the other area supplies liquid to the second immersion channel 610. The cooling medium entering the second immersion channel 610 flows over the surface of the battery pack 100 and absorbs heat, then enters the inner cavity of the third longitudinal beam 700, and finally exits from the second outlet 710. In this way, independent immersion cooling of the battery pack 100 on the other side of the first longitudinal beam 200 (i.e., the side facing the third longitudinal beam 700) is achieved, without interfering with the immersion cooling of the side of the first longitudinal beam 200 facing the second longitudinal beam 300.

[0061] In some embodiments, please refer to Figure 4 In this embodiment, the first flow channel 520 includes two first branch flow channels 521, a common cooling flow channel 522, and two second branch flow channels 523. The two first branch flow channels 521 are located on the inlet side of the cooling flow channel 522, corresponding to the first side (towards the second longitudinal beam 300) and the second side (towards the third longitudinal beam 700). Both the two first branch flow channels 521 and the cooling flow channel 522 are connected to the inlet of the first flow channel 520. The two second branch flow channels 523 are located on the outlet side of the cooling flow channel 522, also corresponding to the first and second sides, and are connected to one outlet of the cooling flow channel 522, meaning that the cooling medium, after being separated from the cooling flow channel 522, enters the two second branch flow channels 523 respectively.

[0062] The battery pack also includes a second outlet pipe 1000. The second outlet pipe 1000 is a tee pipe. The outlet of the second outlet pipe 1000 is connected to an external device or container that contains the heat exchanged medium. One inlet of the second outlet pipe 1000 is connected to the second liquid outlet 710, and the other inlet of the second outlet pipe 1000 is connected to the outlet of the second branch channel 523 on the second side of the first flow channel 520.

[0063] The first longitudinal beam 200 is also provided with multiple second outlets 230, which connect the inner cavity of the first longitudinal beam 200 to the second immersion channel 610. The third longitudinal beam 700 is provided with multiple second inlets 720, which connect the inner cavity of the third longitudinal beam 700 to the second immersion channel 610.

[0064] After the cooling medium enters the inner cavity of the first longitudinal beam 200 through the first inlet 210, a portion of it enters the second immersion channel 610 through the second outlet 230 to immerse and cool the battery pack 100 between the first longitudinal beam 200 and the third longitudinal beam 700. The heat-exchanged medium is collected in the inner cavity of the third longitudinal beam 700 through multiple second inlets 720, flows out from the second outlet 710, and is discharged through the outlet of the second outlet pipe 1000.

[0065] When multiple battery packs 100 are arranged between the first longitudinal beam 200 and the third longitudinal beam 700, a second cold plate 2000 is also sandwiched between two adjacent battery packs 100, and a second immersion channel 610 is formed between the top plate 400, the first longitudinal beam 200, the third longitudinal beam 700, and these battery packs 100. At this time, the battery pack is also provided with a second inlet transfer pipe 5000 and a second outlet transfer pipe 6000. One end of the second inlet transfer pipe 5000 is connected to the first branch channel 521 on the second side of the first channel 520, so that the second inlet transfer pipe 5000 is connected to the inlet pipe 800; the other end of the second inlet transfer pipe 5000 passes through multiple second cold plates 2000 between the first longitudinal beam 200 and the third longitudinal beam 700 in sequence, and is connected to the first sub-channel 2110 of these second cold plates 2000 respectively. One end of the second outlet transfer pipe 6000 is connected to the second branch flow channel 523 on the second side of the first flow channel 520, and the other end of the second outlet transfer pipe 6000 passes through multiple second cold plates 2000 between the first longitudinal beam 200 and the third longitudinal beam 700, and is connected to the third sub-flow channels 2130 of these second cold plates 2000 respectively. In this way, the fresh cooling medium entering from the inlet pipe 800 enters the second inlet transfer pipe 5000 through the first branch flow channel 521 on the second side of the first flow channel 520 to supply liquid to the multiple second cold plates 2000 on the second side; the medium after heat exchange flows back to the second branch flow channel 523 on the second side of the first flow channel 520 through the second outlet transfer pipe 6000, and is then discharged through the second outlet pipe 1000.

[0066] It should be noted that the inner cavity of the first longitudinal beam 200 can be divided into two branching chambers and one confluence chamber. The two branching chambers are used to distribute the cooling medium to the first side (towards the second longitudinal beam 300) and the second side (towards the third longitudinal beam 700), respectively. The confluence chamber is used to collect the cooling medium entering from the first inlet 210, and then through the connection between the confluence chamber and the two branching chambers, it flows evenly into the two branching chambers, thereby avoiding mutual interference between the submerged flows on both sides.

[0067] In some embodiments, please refer to Figure 7 A rigid insulating structure (not marked in the figure), such as an epoxy board, is provided between the battery pack 100 and each longitudinal beam (first longitudinal beam 200, second longitudinal beam 300, and third longitudinal beam 700). The epoxy board is bonded to the side of the battery pack 100 and sealed to the side wall of the longitudinal beam, ensuring that the immersion liquid can only flow into the first immersion channel 600 or the second immersion channel 610 from a predetermined direction. By controlling the thickness of the epoxy board, the contact area between the side immersion liquid and the side of the battery pack 100 can be adjusted, thereby controlling the heat transfer intensity and improving the temperature uniformity of the battery pack 100. This rigid structure is arranged between each longitudinal beam and the battery pack 100.

[0068] A buffer is provided between the large surfaces of individual cells 110 (i.e., between the opposing surfaces of two adjacent individual cells 110). The function of the buffer is to absorb the expansion of the cells during use, while filling the space that may form dead water zones, reducing the ineffective amount of immersion fluid, thereby reducing the weight of the battery pack and lowering costs. The buffer can be made of rubber or CR (Chloroprene Rubber) foam. The thickness of the buffer in the first direction X is controlled within the range of 1.5mm to 2mm to reduce the encroachment on the cell arrangement space, allowing the battery pack to accommodate more individual cells 110. The height of the buffer in the third direction Z is 3mm to 10mm below the shoulder of the individual cell 110 (i.e., the non-electrode area at the top of the individual cell 110) to allow the immersion fluid on the side to pass through, utilizing a local area of ​​the large surface of the cell for efficient heat dissipation. Specifically, the thickness of the buffer in the first direction X can be any value or a range between any two of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2.0mm; the height of the buffer in the third direction Z below the shoulder of the single cell 110 can be any value or a range between any two of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.

[0069] In some embodiments, please refer to Figure 7 The battery pack also includes module end plates 8000 and crossbeams 9000. Module end plates 8000 are located at both ends of the battery pack 100 along a first direction X, for securing multiple individual battery cells 110. Crossbeams 9000 abut against module end plates 8000, applying mechanical constraints to secure the battery modules. The space between the crossbeams 9000 and module end plates 8000 can be used to house BMS slave boards. Furthermore, the battery pack includes electrical connectors (not shown) and low-voltage communication harnesses (not shown), all of which are connected to external electrical systems via sealed connectors.

[0070] In some embodiments, the first longitudinal beam 200 has a secondary distribution structure inside, such as a multi-stage flow divider or a throttling orifice plate, to ensure that the cooling medium is evenly distributed to each battery pack 100. The second longitudinal beam 300 and the third longitudinal beam 700 both have perforated outlets and also have a secondary distribution structure inside, to further increase the rationality of flow distribution and improve the heat exchange uniformity of each individual battery 110.

[0071] The sidewall facing the longitudinal beam towards the battery pack 100 constitutes a side cooling structure. The height of this sidewall in the third direction Z is 1mm to 20mm below the shoulder of the individual cell 110 (i.e., the non-electrode area at the top of the individual cell 110). Specifically, the distance between the height of this sidewall in the third direction Z and the shoulder of the individual cell 110 can be any value or a range between any two values, such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, and 20mm, to allow the immersion liquid to pass smoothly and effectively utilize the large local heat dissipation area of ​​the cell. The internal flow channel form of the side cooling structure is not specifically limited, as long as it can guide the cooling medium to flow across the side of the cell. The surface of this sidewall is insulated and bonded to the side of the cell to ensure low interfacial thermal resistance.

[0072] The aforementioned longitudinal beams can be manufactured using an extrusion molding process, combined with processes such as brazing, to design the internal flow channel structure. This embodiment does not limit the specific manufacturing process.

[0073] In summary, the battery pack provided in this application embodiment forms two independent immersion channels (first immersion channel 600 and second immersion channel 610) by setting a second longitudinal beam 300 and a third longitudinal beam 700 on both sides of the first longitudinal beam 200, and by utilizing a first cold plate 500, a second cold plate 2000, and multiple sets of transfer pipes, it achieves composite heat exchange of top immersion cooling and side cold plate cooling. This solution achieves efficient heat dissipation within a limited space, reduces the amount of cooling oil added, and ensures the temperature uniformity and safety of the battery pack 100 during high-rate charging and discharging above 10C.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] The battery pack provided in the embodiments of this application has been described in detail above. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: The battery pack (100) includes a plurality of individual cells (110) arranged sequentially along a first direction (X). The first longitudinal beam (200) is located on one side of the battery pack (100) in the second direction (Y) and is spaced apart from the battery pack (100); The second longitudinal beam (300) is located on the side of the battery pack (100) away from the first longitudinal beam (200) and is spaced apart from the battery pack (100); A top plate (400) is spaced apart on one side of the battery pack (100) in the third direction (Z), and a first immersion channel (600) is formed between the top plate (400), the first longitudinal beam (200) and the second longitudinal beam (300) and the battery pack (100). The first longitudinal beam (200) has a first liquid inlet (210), and the second longitudinal beam (300) has a first liquid outlet (310). The cooling medium can flow through the first liquid inlet (210), the first immersion channel (600), and the first liquid outlet (310) in sequence. The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a first cold plate (500) having a first flow channel (520) through which the cooling medium flows. The first cold plate (500) is disposed on the side of the battery pack (100) away from the top plate (400), and the first cold plate (500) is connected to the first longitudinal beam (200), the second longitudinal beam (300) and the battery pack (100) respectively.

3. The battery pack according to claim 2, characterized in that, A plurality of battery packs (100) are provided between the first longitudinal beam (200) and the second longitudinal beam (300) at intervals along the second direction (Y); the first immersion channel (600) is formed between the top plate (400), the first longitudinal beam (200) and the second longitudinal beam (300) and the plurality of battery packs (100). The battery pack also includes a plurality of second cold plates (2000), with the second cold plates (2000) sandwiched between two adjacent battery packs (100), and the second cold plates (2000) having a second flow channel (2100) through which the cooling medium flows.

4. The battery pack according to claim 3, characterized in that, The second flow channel (2100) includes: The first sub-channel (2110) is provided to extend along the first direction (X); The second sub-channel (2120) extends along the third direction (Z) and is located at the end of the second cold plate (2000) away from the first liquid inlet (210). The second sub-channel (2120) is connected to the first sub-channel (2110). The third sub-channel (2130) is disposed at a distance from the first sub-channel (2110) along the third direction (Z) and is connected to the second sub-channel (2120).

5. The battery pack according to claim 4, characterized in that, The battery pack also includes: The first inlet transfer pipe (3000) has one end connected to the first flow channel (520) and the other end of the first inlet transfer pipe (3000) passes through multiple second cold plates (2000) in sequence and is connected to multiple first sub-flow channels (2110) respectively. The first outlet transfer pipe (4000) has one end connected to the first flow channel (520), and the other end of the first outlet transfer pipe (4000) passes through multiple second cold plates (2000) in sequence and is connected to multiple third sub-flow channels (2130) respectively.

6. The battery pack according to claim 5, characterized in that, The battery pack also includes: The inlet pipe (800) is connected to the first liquid inlet (210) and the first flow channel (520) respectively, and the inlet pipe (800) is connected to the first inlet transfer pipe (3000) through the first flow channel (520); The first outlet pipe (900) is connected to the first liquid outlet (310) and the first flow channel (520) respectively, and the first outlet pipe (900) is connected to the first outlet transfer pipe (4000) through the first flow channel (520); The cooling medium can flow sequentially through the inlet pipe (800), the first flow channel (520), the first inlet transfer pipe (3000), multiple second flow channels (2100), the first outlet transfer pipe (4000), the first flow channel (520), and the first outlet pipe (900).

7. The battery pack according to claim 5, characterized in that, The first longitudinal beam (200) has multiple first outlets (220), and the multiple first outlets (220) are respectively connected to the inner cavity of the first longitudinal beam (200) and the first immersion channel (600); The second longitudinal beam (300) has multiple first inlets (320), and the multiple first inlets (320) are respectively connected to the inner cavity of the second longitudinal beam (300) and the first immersion channel (600), and the inner cavity of the second longitudinal beam (300) is connected to the first liquid outlet (310).

8. The battery pack according to any one of claims 1 to 7, characterized in that, The battery pack further includes a third longitudinal beam (700), which is disposed on the side of the first longitudinal beam (200) away from the second longitudinal beam (300) and connected to the top plate (400). At least one battery pack (100) is disposed between the third longitudinal beam (700) and the first longitudinal beam (200), and the third longitudinal beam (700) and the battery pack (100) are spaced apart. The third longitudinal beam (700) has a second liquid outlet (710). The top plate (400), the first longitudinal beam (200) and the third longitudinal beam (700) form a second immersion channel (610) with the battery pack (100), and the cooling medium can flow sequentially through the first liquid inlet (210), the second immersion channel (610) and the second liquid outlet (710).

9. The battery pack according to claim 8, characterized in that, The battery pack also includes a second outlet pipe (1000), which is connected to the second liquid outlet (710) and the first flow channel (520) respectively.

10. The battery pack according to claim 9, characterized in that, The first longitudinal beam (200) is also provided with a plurality of second outlets (230), which are respectively connected to the inner cavity of the first longitudinal beam (200) and the second immersion channel (610); The third longitudinal beam (700) has multiple second inlets (720), which are respectively connected to the inner cavity of the third longitudinal beam (700) and the second immersion channel (610).

11. The battery pack according to claim 10, characterized in that, When multiple battery packs (100) are arranged between the first longitudinal beam (200) and the third longitudinal beam (700), a second cold plate (2000) is sandwiched between two adjacent battery packs (100), and a second immersion channel (610) is formed between the top plate (400), the first longitudinal beam (200) and the third longitudinal beam (700) and the multiple battery packs (100).

12. The battery pack according to claim 11, characterized in that, The battery pack also includes: The second inlet transfer pipe (5000) has one end connected to the first flow channel (520), and the second inlet transfer pipe (5000) is connected to the inlet pipe (800) through the first flow channel (520). The other end of the second inlet transfer pipe (5000) passes through multiple second cold plates (2000) between the first longitudinal beam (200) and the third longitudinal beam (700) in sequence, and is connected to the first sub-flow channel (2110) of the multiple second cold plates (2000) respectively. The second outlet transfer pipe (6000) has one end connected to the first flow channel (520), and the other end of the second outlet transfer pipe (6000) passes through multiple second cold plates (2000) between the first longitudinal beam (200) and the third longitudinal beam (700), and is connected to the third sub-flow channels (2130) of the multiple second cold plates (2000) respectively.

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