Battery box with immersion flow channel and battery pack

Abstract

The utility model provides a battery box with an immersion runner and a battery pack. The battery box with the immersion runner comprises a bottom plate, two first side beams, two second side beams and at least one longitudinal beam, the two first side edge beams and the two second side edge beams are connected end to end to define a frame structure and are located on the bottom plate, first cavities are formed in the first side edge beams, first longitudinal bars are arranged in the first side edge beams, and the first longitudinal bars are vertically arranged between the top walls and the bottom walls of the first cavities, so that first flow channels are formed in one sides of the first longitudinal bars; the at least one longitudinal beam is mounted on the bottom plate and is parallel to the first side edge beam so as to divide the battery box into at least two battery placement areas, and a second flow channel is formed in the longitudinal beam; the end face and the side face of one of the first side edge beam and the longitudinal beam are provided with a liquid inlet pipe and a liquid outlet groove respectively, the end face and the side face of the other one of the first side edge beam and the longitudinal beam are provided with a liquid outlet pipe and a liquid return groove respectively, the liquid inlet pipe and the liquid outlet pipe are used for leading in and recycling immersion liquid respectively, and the liquid outlet groove leads to the battery placement area. The immersion liquid is circularly introduced into the battery placement area, so that the battery cell assembly in the battery placement area is in complete contact with the immersion liquid, the heat transfer path is greatly shortened, the temperature uniformity is relatively good, and the risk of thermal runaway of the battery pack is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery box and battery pack with an immersion channel. Background Technology

[0002] Power batteries are a crucial component of new energy vehicles, and the safety, reliability, charging time, and driving range of these vehicles are all related to the performance of the power batteries. Reducing charging time has become a primary focus for power battery improvement. Currently, shortening charging time requires high-power charging, which inevitably leads to excessively rapid temperature rise in the battery module. If this temperature cannot be effectively cooled in time, there is a risk of thermal runaway, thus affecting the battery's safety and reliability.

[0003] In existing technologies, power batteries typically employ liquid cooling. Specifically, liquid cooling plates are usually fixed to the bottom or top wall of the housing to cool the battery modules. However, due to the relatively simple arrangement of the liquid cooling plate heat dissipation structure, the heat transfer path from the cell to the liquid cooling plate is long, and the overall thermal resistance is relatively large. When the battery pack is large, the heat dissipation structure of the liquid cooling plate cannot guarantee uniform battery temperature at all locations, thereby increasing the risk of thermal runaway of the battery pack. Utility Model Content

[0004] In view of this, the present invention proposes a battery box and battery pack with an immersion flow channel to solve the technical problems mentioned in the background art, such as the long heat transfer path from the cell to the liquid cooling plate, the large thermal resistance between the whole, and the inability of the cold plate heat dissipation structure to ensure uniform battery temperature at all locations when the battery pack is large, thereby increasing the risk of thermal runaway of the battery pack.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, this utility model provides a battery box with an immersion channel, comprising a base plate, two first side beams, two second side beams, and at least one longitudinal beam, wherein:

[0007] Two first side beams and two second side beams are connected end to end to form a frame structure, and both are located on the bottom plate. The first side beam has a first cavity inside and a first longitudinal rib inside. The first longitudinal rib is vertically arranged between the top wall and the bottom wall of the first cavity to form a first flow channel on one side of the first longitudinal rib.

[0008] At least one of the longitudinal beams is mounted on the base plate and parallel to the first side beam to divide the battery box into at least two battery placement areas, and the longitudinal beam has a second flow channel inside;

[0009] The first side beam and the longitudinal beam, one of which is provided with an inlet pipe and an outlet trough on its end face and side face respectively, and the other of which is provided with an outlet pipe and a return trough on its end face and side face respectively. The inlet pipe and the outlet pipe are used for introducing and recovering the immersion liquid respectively, and the outlet trough leads to the battery placement area.

[0010] Based on the above technical solutions, preferably, the first side beam further includes at least two first transverse ribs, the first transverse ribs being horizontally disposed between the first longitudinal rib and the side wall of the first cavity, and at least one first transverse rib being provided on both sides of the first longitudinal rib.

[0011] Based on the above technical solution, preferably, the longitudinal beam has a second cavity inside and a second transverse rib inside, the second transverse rib being horizontally arranged between the two side walls of the second cavity to divide the second cavity into two second flow channels.

[0012] Based on the above technical solution, preferably, it also includes a dividing beam, the two ends of which are respectively connected to the two first side beams and are parallel to the second side beam. The dividing beam, the first side beam, and the second side beam form a high-heat zone and a low-heat zone. The liquid outlet tank is connected to the high-heat zone, and the sides of the first side beam and the longitudinal beam corresponding to the low-heat zone are closed.

[0013] Based on the above technical solutions, preferably, both first side beams are provided with inlet pipes, and the outlet pipe is provided on the longitudinal beam, with the diameter of the outlet pipe being larger than the diameter of the inlet pipe.

[0014] Based on the above technical solutions, preferably, both first side beams are provided with liquid outlet pipes, and the liquid inlet pipe is provided on the longitudinal beam, with the diameter of the liquid inlet pipe being larger than the diameter of the liquid outlet pipe.

[0015] Based on the above technical solutions, preferably, the liquid outlet trough is evenly arranged on the side of the first side beam or the longitudinal beam, and the liquid return trough is evenly arranged on the side of the first side beam or the longitudinal beam.

[0016] Based on the above technical solutions, preferably, the side of the longitudinal beam facing the battery placement area is provided with the liquid outlet groove or liquid return groove.

[0017] Based on the above technical solutions, preferably, both the liquid outlet tank and the liquid return tank are vertically arranged square slots.

[0018] Secondly, the present invention provides a battery pack, including a cell assembly and a battery box with an immersion channel as described in the first aspect, wherein the cell assembly is placed in the battery placement area.

[0019] The battery box and battery pack of this utility model, which are equipped with immersion channels, have the following advantages over the prior art:

[0020] (1) The first side beam and the longitudinal beam are provided with an inlet pipe and an outlet trough on the end face and side face of one of them, respectively, and an outlet pipe and a return trough on the end face and side face of the other. The inlet pipe and the outlet pipe are used for the introduction and recovery of the immersion liquid, respectively. The outlet trough leads to the battery placement area and circulates the immersion liquid into the battery placement area, so that the battery cell assembly in the battery placement area is in complete contact with the immersion liquid, the heat transfer path is greatly shortened, and the temperature uniformity is better, reducing the risk of thermal runaway of the battery pack.

[0021] (2) The first transverse rib is horizontally arranged between the first longitudinal rib and the side wall of the first cavity, and at least one first transverse rib is provided on both sides of the first longitudinal rib to strengthen the strength of the first side beam and improve the reliability and stability of the device.

[0022] (3) A second cavity is provided inside the longitudinal beam, and a second transverse rib is provided inside the longitudinal beam. The second transverse rib is horizontally arranged between the two side walls of the second cavity to divide the second cavity into two second flow channels. The second transverse rib can strengthen the strength of the second cavity and improve the reliability of the device.

[0023] (4) The two ends of the dividing beam are respectively connected to the two first side beams and are parallel to the second side beam. The dividing beam, the first side beam and the second side beam form a high-heat zone and a low-heat zone. The liquid outlet tank is connected to the high-heat zone. The immersion liquid is introduced into the high-heat zone. The sides of the first side beam and the longitudinal beam corresponding to the low-heat zone are closed, so there is no need to introduce the immersion liquid into the low-heat zone. This can effectively reduce the amount of immersion liquid used and reduce costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of a battery box with an immersion channel according to Embodiment 1 of the present invention;

[0026] Figure 2 This is a perspective view of the first side beam in Embodiment 1 of this utility model;

[0027] Figure 3This is a cross-sectional view of the first side beam in Embodiment 1 of this utility model;

[0028] Figure 4 This is a perspective view of the longitudinal beam in Embodiment 1 of this utility model;

[0029] Figure 5 This is a cross-sectional view of the longitudinal beam in Embodiment 1 of this utility model;

[0030] Figure 6 This is a schematic diagram of the flow of immersion liquid in the immersion channel according to Embodiment 1 of this utility model;

[0031] Figure 7 This is a perspective view of a battery box with an immersion channel according to Embodiment 2 of the present invention;

[0032] Figure 8 This is a schematic diagram of the flow of immersion liquid in the immersion channel according to Embodiment 2 of this utility model;

[0033] Figure 9 This is a schematic diagram of the battery pack structure of this utility model.

[0034] Explanation of reference numerals in the attached drawings: 1-base plate, 2-first side beam, 3-second side beam, 4-longitudinal beam, 5-separating beam, 6-fixed beam;

[0035] 100-Battery placement area, 200-Inlet pipe, 300-Outlet tank, 400-Outlet pipe, 500-Return tank, 600-High heat zone, 700-Low heat zone, 800-Cell assembly;

[0036] 21-First cavity, 22-First longitudinal rib, 23-First flow channel, 24-First transverse rib;

[0037] 41-Second cavity, 42-Second transverse rib, 43-Second flow channel. Detailed Implementation

[0038] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0039] Example 1

[0040] Reference Figures 1-6 As shown in the embodiment of this utility model, a battery box with an immersion channel is proposed, including a base plate 1, two first side beams 2, two second side beams 3, and a longitudinal beam 4, wherein:

[0041] Two first side beams 2 and two second side beams 3 are connected end to end to form a frame structure, and both are located on the base plate 1. The two ends of the first side beams 2 are respectively connected to the two second side beams 3. The two first side beams 2 are parallel to each other and form a cuboid with an open top with the base plate 1. The first side beams 2 have a first cavity 21 inside and a first longitudinal rib 22 inside. The first longitudinal rib 22 is vertically arranged between the top wall and the bottom wall of the first cavity 21 to form a first flow channel 23 on one side of the first longitudinal rib 22, which supports the first cavity 21 and strengthens the first side beams 2.

[0042] The longitudinal beam 4 is installed on the base plate 1 and parallel to the first side beam 2 to divide the battery box into two battery placement areas 100. The longitudinal beam 4 is provided with a second flow channel 43 inside.

[0043] The first side beam 2 has an inlet pipe 200 and an outlet trough 300 on its end face and side face, respectively. The longitudinal beam 4 has an outlet pipe 400 and a return trough 500 on its end face and side face, respectively. The inlet pipe 200 and the outlet pipe 400 are used for introducing and recovering the immersion liquid, respectively. The outlet trough 300 leads to the battery placement area 100, which is used to place the battery cell assembly 800. The longitudinal beam 4 has a return trough 500 on its side facing the battery placement area 100, meaning that both sides have return troughs 500 to recover the immersion liquid from both battery placement areas 100. The inlet pipe 200 and the outlet pipe 400 can be located on different sides or on the same side.

[0044] It should be noted that in this embodiment, there is only one longitudinal beam 4. The number of longitudinal beams 4 can also be set as needed. For example, two longitudinal beams 4 can divide the battery box into three battery placement areas 100, three longitudinal beams 4 can divide the battery box into three battery placement areas 100, and so on.

[0045] The battery box with an immersion channel proposed in this embodiment has an inlet pipe 200 and an outlet trough 300 on the end face and side face of the first side beam 2, respectively. The end face and side face of the longitudinal beam 4 are provided with an outlet pipe 400 and a return trough 500, respectively. The inlet pipe 200 and the outlet pipe 400 are used for the introduction and recovery of immersion liquid, respectively. The outlet trough 300 leads to the battery placement area 100, circulating the immersion liquid into the battery placement area 100, so that the battery cell assembly 800 in the battery placement area 100 is in complete contact with the immersion liquid. The heat transfer path is greatly shortened, and the temperature uniformity is better, reducing the risk of thermal runaway of the battery pack.

[0046] In some embodiments, the first side beam 2 further includes at least two first transverse ribs 24. The first transverse ribs 24 are horizontally disposed between the first longitudinal rib 22 and the side wall of the first cavity 21, and at least one of the first transverse ribs 24 is provided on each side of the first longitudinal rib 22. A specific example is as follows Figure 3 As shown, one transverse rib is located on one side of the first longitudinal rib 22, separating two first flow channels 23. Two transverse ribs are located on the other side of the first longitudinal rib 22. The three transverse ribs are arranged in a 'pin' shape, increasing the strength of the first side beam 2 and improving the reliability and stability of the device.

[0047] In some embodiments, a second cavity 41 is provided inside the longitudinal beam 4, and a second transverse rib 42 is provided inside the longitudinal beam 4. The second transverse rib 42 is horizontally disposed between the two side walls of the second cavity 41 to divide the second cavity 41 into two second flow channels 43. By horizontally disposing the second transverse rib 42 between the two side walls of the second cavity 41 to divide the second cavity 41 into two second flow channels 43, the second transverse rib 42 can strengthen the strength of the second cavity 41 and improve the reliability of the device.

[0048] In some embodiments, the battery box further includes a separating cross beam 5. The two ends of the separating cross beam 5 are respectively connected to the two first side beams 2 and are parallel to the second side beam 3. The separating cross beam 5, the first side beam 2 and the second side beam 3 enclose a high-temperature area 600 and a low-temperature area 700. The liquid outlet groove 300 is connected to the high-temperature area 600, and the sides of the first side beam 2 and the longitudinal beam 4 corresponding to the low-temperature area 700 are closed. The separating cross beam 5, the first side beam 2 and the second side beam 3 enclose a high-temperature area 600 and a low-temperature area 700. Components such as BDU with relatively large heat generation are arranged in the high-temperature area 600, and collection and communication components with relatively small heat generation are arranged in the low-temperature area 700. The liquid outlet groove 300 and the liquid return groove 500 are arranged in the high-temperature area 600, and immersion liquid is introduced into the high-temperature area 600 to quickly带走 heat and ensure the stability and lifespan of the device; the immersion liquid is not introduced into the low-temperature area 700, which can effectively reduce the usage amount of the immersion liquid and is beneficial to cost reduction.

[0049] In a further embodiment, the battery box further includes a fixing cross beam 6. The fixing cross beam 6 is parallel to the separating cross beam 5 and is disposed close to the second side beam 3. The fixing cross beam 6, the separating cross beam 5, the first side beam 2, the second side beam 3 and the longitudinal beam 4 enclose two battery placement areas 100.

[0050] In some embodiments, the diameter of the outlet pipe 400 is larger than the diameter of the inlet pipe 200. There are two inlet pipes 200 and only one outlet pipe 400. The larger diameter of the outlet pipe 400 ensures a balance in the inflow and outflow of the immersion liquid, improving the reliability and stability of the device. Preferably, the diameter of the outlet pipe 400 is twice the diameter of the inlet pipe 200.

[0051] In some embodiments, the outlet tanks 300 are evenly arranged on the side of the first side beam 2, and the return tanks 500 are evenly arranged on the side of the longitudinal beam 4. The outlet tanks 300 are arranged in two rows, corresponding to and connecting two first flow channels 23 respectively. Each row of outlet tanks 300 is arranged at equal intervals, making the flow of the immersion liquid more uniform. Similarly, the return tanks 500 are arranged in two rows, corresponding to and connecting two second flow channels 43 respectively. Each row of return tanks 500 is arranged at equal intervals, making the flow of the immersion liquid more uniform.

[0052] In some embodiments, both the outlet tank 300 and the return tank 500 are vertically arranged square slots. The use of directional slots provides higher strength compared to a single elongated hole, thus improving the reliability of the device.

[0053] The working principle of the battery pack equipped with an immersion channel is as follows: the immersion liquid is introduced into the first channel 23 from the inlet pipe 200, enters the battery placement area 100 and the high-heat area 600 through the outlet tank 300, and then enters the second channel 43 through the return tank 500. It is then recovered from the outlet pipe 400, and the immersion liquid is circulated into the battery placement area 100 and the high-heat area 600. This ensures that the cell assembly 800 in the battery placement area 100 and the components in the high-heat area 600 are in complete contact with the immersion liquid, which greatly shortens the heat transfer path and improves the temperature uniformity, thereby reducing the risk of thermal runaway of the battery pack.

[0054] Example 2

[0055] Unlike Embodiment 1, this embodiment of the invention proposes a battery box with an immersion flow channel, see [link to embodiment]. Figure 7 and Figure 8 As shown, it includes a base plate 1, two first side beams 2, two second side beams 3, and a longitudinal beam 4, wherein:

[0056] Two first side beams 2 and two second side beams 3 are connected end to end to form a frame structure, and both are located on the bottom plate 1. The two ends of the first side beams 2 are respectively connected to the two second side beams 3. The two first side beams 2 are parallel to each other and form a cuboid with an open top with the bottom plate 1. The first side beams 2 have a first cavity 21 inside and a first longitudinal rib 22 inside. The first longitudinal rib 22 is vertically arranged between the top wall and the bottom wall of the first cavity 21 to form a first flow channel 23 on one side of the first longitudinal rib 22.

[0057] The longitudinal beam 4 is installed on the base plate 1 and parallel to the first side beam 2 to divide the battery box into two battery placement areas 100. The longitudinal beam 4 is provided with a second flow channel 43 inside.

[0058] The longitudinal beam 4 has an inlet pipe 200 and an outlet trough 300 on its end face and side face, respectively. The first side beam 2 has an outlet pipe 400 and a return trough 500 on its end face and side face, respectively. The inlet pipe 200 and the outlet pipe 400 are used for introducing and recovering the immersion liquid, respectively. The outlet trough 300 leads to the battery placement area 100, which is used to place the battery cell assembly 800. The longitudinal beam 4 has an inlet trough on its side facing the battery placement area 100, that is, both sides have inlet troughs to introduce immersion liquid into the two battery placement areas 100. The inlet pipe 200 and the outlet pipe 400 can be located on different sides or on the same side.

[0059] It should be noted that in this embodiment, there is only one longitudinal beam 4. The number of longitudinal beams 4 can also be set as needed. For example, two longitudinal beams 4 can divide the battery box into three battery placement areas 100, three longitudinal beams 4 can divide the battery box into three battery placement areas 100, and so on.

[0060] In some embodiments, the diameter of the inlet pipe 200 is larger than the diameter of the outlet pipe 400. There are two outlet pipes 400 and only one inlet pipe 200. The larger diameter of the inlet pipe 200 compared to the outlet pipe 400 ensures a balance in the inflow and outflow of the immersion liquid, improving the reliability and stability of the device. Preferably, the diameter of the inlet pipe 200 is twice the diameter of the outlet pipe 400.

[0061] In some embodiments, the outlet channels 300 are evenly arranged on the side of the longitudinal beam 4, and the return channels 500 are evenly arranged on the side of the first side beam 2. The outlet channels 300 are arranged in two rows, corresponding to and connecting two second flow channels 43 respectively. Each row of outlet channels 300 is arranged at equal intervals, making the flow of the immersion liquid more uniform. The return channels 500 are arranged in two rows, corresponding to and connecting two first flow channels 23 respectively. Each row of return channels 500 is arranged at equal intervals, making the flow of the immersion liquid more uniform.

[0062] The working principle of the battery pack equipped with an immersion channel is as follows: the immersion liquid is introduced into the second channel 43 from the inlet pipe 200, enters the battery placement area 100 and the high-heat area 600 through the outlet tank 300, and then enters the first channel 23 through the return tank 500. It is then recovered from the outlet pipe 400, and the immersion liquid is circulated into the battery placement area 100 and the high-heat area 600. This ensures that the cell assembly 800 in the battery placement area 100 and the components in the high-heat area 600 are in complete contact with the immersion liquid, which greatly shortens the heat transfer path and improves the temperature uniformity, thereby reducing the risk of thermal runaway of the battery pack.

[0063] Example 3

[0064] Based on the same concept, this utility model embodiment proposes a battery pack, see [link to relevant documentation]. Figure 9 As shown, the battery includes a cell assembly 800 and a battery box with an immersion channel as described in Embodiments 1 and 2, wherein the cell assembly 800 is placed in the battery placement area 100.

[0065] The battery pack proposed in this embodiment circulates the immersion liquid into the battery placement area 100, so that the cell assembly 800 in the battery placement area 100 is in complete contact with the immersion liquid. This significantly shortens the heat transfer path and improves temperature uniformity, thereby reducing the risk of thermal runaway of the battery pack.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery tank provided with an immersion runner, characterized by comprising: It comprises a bottom plate (1), two first side edge beams (2), two second side edge beams (3) and at least one longitudinal beam (4), wherein: The two first side edge beams (2) and the two second side edge beams (3) are connected end to end to form a frame structure, and are located on the bottom plate (1), the first side edge beam (2) is provided with a first cavity (21) inside, the first side edge beam (2) is provided with a first longitudinal reinforcement (22) inside, the first longitudinal reinforcement (22) is vertically arranged between the top wall and the bottom wall of the first cavity (21) to form a first flow channel (23) on one side of the first longitudinal reinforcement (22); At least one longitudinal beam (4) is installed on the bottom plate (1) and parallel to the first side edge beam (2) to divide the battery box into at least two battery placement areas (100), and the longitudinal beam (4) is provided with a second flow channel (43) inside; The end face and the side face of one of the first side edge beam (2) and the longitudinal beam (4) are respectively provided with a liquid inlet pipe (200) and a liquid outlet groove (300), and the end face and the side face of the other are respectively provided with a liquid outlet pipe (400) and a liquid return groove (500), the liquid inlet pipe (200) and the liquid outlet pipe (400) are respectively used for guiding and recycling the immersion liquid, and the liquid outlet groove (300) is connected to the battery placement area (100).

2. The battery tank provided with an immersion runner according to claim 1, wherein The first side edge beam (2) further comprises at least two first transverse reinforcements (24), the first transverse reinforcement (24) is horizontally arranged between the first longitudinal reinforcement (22) and the side wall of the first cavity (21), and at least one first transverse reinforcement (24) is arranged on both sides of the first longitudinal reinforcement (22).

3. The battery tank provided with an immersion runner according to claim 2, wherein The longitudinal beam (4) is provided with a second cavity (41) inside, the longitudinal beam (4) is provided with a second transverse reinforcement (42) inside, the second transverse reinforcement (42) is horizontally arranged between the two side walls of the second cavity (41) to divide the second cavity (41) into two second flow channels (43).

4. The battery tank provided with an immersion runner according to claim 1, wherein It further comprises a partition beam (5), the partition beam (5) is connected to the two first side edge beams (2) at both ends and is parallel to the second side edge beam (3), the partition beam (5) and the first side edge beam (2) and the second side edge beam (3) form a high-temperature area (600) and a low-temperature area (700), the liquid outlet groove (300) is connected to the high-temperature area (600), and the side face of the first side edge beam (2) and the longitudinal beam (4) corresponding to the low-temperature area (700) is closed.

5. The battery box provided with an immersion runner according to claim 1, wherein Both of the two first side edge beams (2) are provided with a liquid inlet pipe (200), the liquid outlet pipe (400) is arranged on the longitudinal beam (4), and the diameter of the liquid outlet pipe (400) is greater than that of the liquid inlet pipe (200).

6. The battery box provided with an immersion runner according to claim 1, wherein Both of the two first side edge beams (2) are provided with a liquid outlet pipe (400), the liquid inlet pipe (200) is arranged on the longitudinal beam (4), and the diameter of the liquid inlet pipe (200) is greater than that of the liquid outlet pipe (400).

7. The battery box provided with an immersion runner according to claim 1, wherein The liquid outlet groove (300) is uniformly arranged on the side of the first side beam (2) or the longitudinal beam (4), and the liquid return groove (500) is uniformly arranged on the side of the first side beam (2) or the longitudinal beam (4).

8. The battery box provided with an immersion runner according to claim 1, wherein The longitudinal beam (4) is provided with the liquid outlet groove (300) or the liquid return groove (500) on the side facing the battery placement area (100).

9. The battery box provided with an immersion runner according to claim 1, wherein The liquid outlet groove (300) and the liquid return groove (500) are both vertically arranged square grooves.

10. A battery pack, characterized by, The battery box provided with the immersion flow channel comprises an electric core assembly (800) and a battery box provided with an immersion flow channel according to any one of claims 1-9, and the electric core assembly (800) is placed in the battery placement area (100).

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