CN117117385A - Immersed liquid cooling battery system - Google Patents

Abstract

The application provides an immersed liquid cooling battery system, relates to the technical field of battery systems, and is used for improving the heat dissipation efficiency of the battery system, reducing the overall cost of the liquid cooling system and simplifying the grouping process. The battery pack comprises a plurality of battery cells and a box body, wherein a plurality of through holes are formed in the surface of the box body, a liquid cooling cavity is formed in the box body and is used for circulating cooling medium, a liquid inlet and a liquid outlet are formed in the liquid cooling cavity, and the battery cells penetrate through the through holes and are partially soaked in the cooling medium in the liquid cooling cavity.

Description

Immersed liquid cooling battery system

Technical Field

The application relates to the technical field of battery systems, in particular to an immersed liquid cooling battery system.

Background

With the explosive growth of the lithium battery energy storage industry, the operation safety and stability of a battery system are increasingly valued in the industry.

After the cylindrical battery cells are grouped, the quantity of the battery cells is large, the heat is seriously generated in the charging and discharging process due to the dense grouping, and the service life and safety of products are influenced, so that the cylindrical battery systems in the industry all take liquid cooling as the main stream, and the cylindrical structure adopts a serpentine liquid cooling plate process (Tesla is pushed out earliest), so that the cambered surface of the serpentine is in contact with the cylindrical surface of the battery cells through a heat conducting pad or heat conducting glue to conduct heat transfer and heat dissipation.

However, because the coiled pipe structure causes complex grouping process and lower grouping efficiency, and the contact area of the coiled pipe and the battery core is smaller (the heating value of small cylinders such as 18650 or 21700 is basically satisfied), the 46 series large cylinders cannot effectively or efficiently dissipate heat due to the large diameter and the large heating value, so that the safety and the service life of the battery system are affected.

Disclosure of Invention

In view of the above, the present application provides an immersion liquid cooling battery system for improving the heat dissipation efficiency of the battery system, reducing the overall cost of the liquid cooling system, and simplifying the grouping process.

The technical scheme adopted by the application for solving the technical problems is as follows:

in a first aspect, the application provides an immersed liquid-cooled battery system, which comprises a plurality of electric cores and a box body, wherein a plurality of through holes are formed in the surface of the box body, a liquid-cooled cavity is formed in the box body and is used for circulating cooling medium, the liquid-cooled cavity is provided with a liquid inlet and a liquid outlet, and the electric cores penetrate through the through holes and are partially soaked in the cooling medium in the liquid-cooled cavity.

In some embodiments of the present application, the plurality of through holes are located on a side wall of one side of the case, and one end of the battery cell penetrates through the through holes and is soaked in the cooling medium of the liquid cooling cavity, and the other end of the battery cell is located outside the liquid cooling cavity.

In some embodiments of the present application, the box has two opposite side walls, the through holes are respectively located on the two side walls, and the liquid cooling cavity is formed between the two side walls; the battery cell passes through the through holes located on the side walls of the two sides in sequence, the battery cell is provided with a first end, a middle section and a second end which are sequentially arranged, the side walls of the two sides of the box body are located between the first end and the second end, and the middle section is immersed in a cooling medium of the liquid cooling cavity.

In some embodiments of the present application, the battery pack further includes a glue filling layer, where the glue filling layer is disposed on a surface of the case body where the through hole is provided, and is used to form a seal between the battery cell and the through hole.

In some embodiments of the present application, the side surface of the battery cell is wrapped with an insulating film.

In some embodiments of the present application, a sealing ring is sleeved between the through hole and the battery cell.

In some embodiments of the present application, the plurality of seal rings are integrally connected in sequence, and the top edges of the seal rings are bent outwards to fit the top end surfaces of the through holes.

In some embodiments of the present application, the tank includes a plurality of tanks, a first side beam and a second side beam, where the first side beam is installed at one end of the plurality of tanks, the second side beam is installed at another end of the plurality of tanks, an integrated inflow pipe is disposed inside the first side beam, the integrated inflow pipe is communicated with the plurality of liquid inlets, and an integrated outflow pipe is disposed inside the second side beam, and the integrated outflow pipe is communicated with the plurality of liquid outlets.

In some embodiments of the present application, a first interface seal is connected between the liquid inlet and the integrated inflow pipe, and a second interface seal is connected between the liquid outlet and the integrated outflow pipe.

In some embodiments of the present application, two end surfaces of the box body are open, and the two end surfaces of the box body, respectively, form the liquid cooling cavity with the first side beam and the second side beam.

In summary, due to the adoption of the technical scheme, the application at least comprises the following beneficial effects:

according to the immersed liquid-cooled battery system provided by the application, the plurality of single electric cores are mainly inserted into the box body, and then the box body into which the plurality of electric cores are inserted is sealed, so that the plurality of electric cores can be respectively immersed in the cooling medium directly by adopting the structure, the heat dissipation area of the electric cores in the charging and power generation processes is maximized, the heat generated by the electric cores in the charging and discharging processes is directly transferred to the cooling medium without heat conduction glue for cooling, the periphery of the electric cores are immersed in the cooling medium, the contact area between the electric cores and immersed liquid is maximized, and therefore, the heat dissipation efficiency is higher.

Drawings

For a clearer description of an embodiment of the application, reference will be made to the accompanying drawings of embodiments, which are given for clarity, wherein:

fig. 1 is a schematic structural diagram of an immersion liquid cooling battery system according to an embodiment of the present application;

fig. 2 is an exploded view of an immersion liquid cooled battery system according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of the longitudinal section of FIG. 2 according to an embodiment of the present application;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3 according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an immersion liquid cooling battery system according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another immersion liquid cooled battery system according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an integrated structure of a seal ring according to an embodiment of the present application.

The drawings are described as follows:

1. a battery cell; 11. an insulating film; 2. a case; 21. a through hole; 211. a seal ring; 22. a liquid cooling cavity; 221. reinforcing ribs; 23. a liquid inlet; 24. a liquid outlet; 25. filling an adhesive layer; 3. a first side rail; 31. integrating the inflow conduit; 32. a first welded end plate; 4. a second side rail; 41. an integrated outflow conduit; 42. and a second welded end plate.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, it should be understood that the words "first" and "second" are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or number of features in which such is indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as exemplary in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

The battery system is usually accompanied by an exothermic process during the charge and discharge processes, and in this process, a cooling process is generally required to make the battery system work in a relatively suitable working temperature environment.

The battery system generally forms the battery module with electric core 1, carries out the forced air cooling heat dissipation in the battery module inside or set up complicated snakelike pipeline and heat conduction glue between adjacent battery module and carry out heat transfer and heat transfer, the efficiency of forced air cooling heat dissipation is lower in liquid cooling radiating efficiency compared, but set up complicated snakelike pipeline and heat conduction glue between adjacent battery module and dispel the heat, seriously rely on the heat transfer ability of heat conduction glue self, and because with snakelike pipeline area of contact is little, the radiating area is little, the radiating efficiency is lower, although for little electric core 1, such radiating efficiency is enough to deal with, but for big electric core 1 now, the radiating efficiency is serious not enough, and the installation process is complicated moreover, the material cost is higher.

Based on the above-mentioned battery system, please refer to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an immersion liquid cooling battery system provided by an embodiment of the present application, and fig. 2 is an explosion schematic diagram of an immersion liquid cooling battery system provided by an embodiment of the present application. The application provides an immersed liquid-cooled battery system, which comprises a plurality of battery cells 1 and a box body 2, wherein a plurality of through holes 21 are formed in the surface of the box body 2, a liquid-cooled cavity 22 is formed in the box body 2, a cooling medium flows in the liquid-cooled cavity 22, the liquid-cooled cavity 22 is provided with a liquid inlet 23 and a liquid outlet 24, and the battery cells 1 penetrate through the through holes 21 and are partially immersed in the cooling medium in the liquid-cooled cavity 22.

It should be understood that the contact position between the through hole 21 and the battery needs to be sealed to form the liquid cooling cavity 22, and the liquid cooling cavity 22 can be glued or glued to prevent the cooling medium from flowing out of the liquid cooling cavity 22, which affects the other cases 2 of the battery system, such as affecting the normal operation of the busbar and the battery temperature detection system.

It should be understood that the shape of the case 2 may be a square, a rectangular parallelepiped, a cylindrical body with a hexagonal top surface, an ellipsoid, or an irregular case.

The cooling medium is a cooling liquid in a common serpentine pipeline, and can be water or ionized water.

In the related art, the coiled pipe directly contacted with the battery core 1 for heat transfer is glued, the glued coiled pipe is adhered to the battery core 1, the glue on the coiled pipe is cured, the battery core 1 module after the glue is cured is stacked to form a battery pack, and the stacked battery pack is hoisted into a protection box body to form a battery pack.

The device for circulating cooling medium and the heat dissipation device, such as a pressure pump for increasing fluid pressure and an evaporator for rapidly dissipating heat to the outside, can be connected between the liquid inlet 23 and the liquid outlet 24 outside the liquid cooling cavity 22, so that a large amount of heat generated in the charge and discharge process of some battery cells 1 is received in the liquid cooling cavity 22, can be rapidly diluted by a large amount of cooling medium at first, is then brought out of the evaporator by the liquid outlet 24 to dissipate heat to the outside, and then sends the cooling medium after sufficient heat dissipation back to the inside of the liquid cooling cavity 22 through the liquid inlet 23 by the pressure pump for preliminary heat dissipation, thereby achieving good heat dissipation effect.

According to the application, the plurality of single electric cores 1 are inserted into the box body 2, and then the box body 2 into which the plurality of electric cores 1 are inserted is sealed, in the first aspect, the plurality of electric cores 1 can be respectively and directly immersed into a cooling medium by adopting the structure, so that the heat dissipation area of the electric cores 1 is maximized in the charging and power generation processes, the heat generated by the electric cores 1 in the charging and discharging processes is directly transferred to the cooling medium without heat conducting glue for cooling, and the periphery of the electric cores 1 are fully immersed into the cooling medium, and the contact area between the electric cores 1 and immersion liquid is maximized, so that the heat dissipation efficiency is higher.

Referring to fig. 4 and fig. 5, fig. 4 is an enlarged schematic diagram of a portion a in fig. 3 according to an embodiment of the present application, and fig. 5 is a schematic diagram of an immersion liquid cooling battery system according to an embodiment of the present application. In some embodiments of the present application, a plurality of through holes 21 are located on a side wall of the case 2, and one end of the battery cell 1 passes through the through holes 21 and is immersed in the cooling medium in the liquid cooling cavity 22, and the other end is located outside the liquid cooling cavity 22.

According to the application, the box body 2 can be arranged as the box body with the through hole 21 on the top surface, and the bottom end of the battery cell 1 is penetrated into the through hole 21, so that the lower part of the battery cell 1 can be completely immersed in a cooling medium, and the bus bar is arranged at the top of the battery cell 1, thereby realizing good heat dissipation effect in the normal charge and discharge process of the battery cell 1 with larger diameter.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another submerged battery system according to an embodiment of the present application, in some embodiments of the present application, a case 2 has two opposite side walls, a plurality of through holes 21 are respectively located on the two side walls, and a liquid cooling cavity 22 is formed between the two side walls; the electric core 1 passes through the through holes 21 positioned on the side walls on two sides in sequence, the electric core 1 is provided with a first end, a middle section and a second end which are sequentially arranged, the side walls on two sides of the box body 2 are positioned between the first end and the second end, and the middle section is immersed in the cooling medium of the liquid cooling cavity 22.

According to the application, the box body 2 is arranged as the box body with the through holes 21 on the top surface and the bottom surface, and the battery cell 1 is penetrated into the through holes 21, so that the middle part of the battery cell 1 can be completely immersed in a cooling medium, and the bus bars are arranged on the top and the bottom surfaces of the battery cell 1, thereby realizing good heat dissipation effect in the normal charge and discharge process of the battery cell 1 with larger diameter.

In some embodiments of the present application, the battery pack further includes a glue-pouring layer 25, where the glue-pouring layer 25 is disposed on the surface of the case 1 where the through hole 21 is disposed, and is used to form a seal between the battery cell 1 and the through hole 21.

It should be understood that the glue filling layer 25 may be used for filling glue to the top surface of the whole box body 2, or may be used for filling glue to the top surface of the box body 2 close to the through hole 21, so long as the through hole 21 is sealed.

According to the application, the glue filling layer 25 is arranged on the surface of the through hole 21, so that the tightness of the through hole 21 is ensured, and the cooling medium is prevented from overflowing from the inside of the through hole 21.

Referring to fig. 5, in some embodiments of the present application, the battery cell 1 is laterally wrapped with an insulating film 11.

According to the application, the insulating film 11 is wrapped on the side surface of the battery cell 1, so that the situation that electric leakage is difficult to occur between the surface of the battery cell 1 and a cooling medium can be caused, and the whole battery system can run more safely and stably.

Referring to fig. 5, in some embodiments of the present application, a sealing ring 211 is sleeved between the through hole 21 and the cell 1.

According to the application, the sealing ring 211 is sleeved between the through hole 21 and the battery cell 1, so that the gap between the through hole 21 and the battery cell 1 is prevented from being immersed into the liquid cooling cavity 22 due to the blocking of the sealing ring 211 in the glue filling process.

Referring to fig. 5 and 7, fig. 7 is a schematic structural diagram of an integrated structure of a sealing ring provided in an embodiment of the present application, a plurality of sealing rings 211 are sequentially connected in an integrated structure, and a top edge of the sealing ring 211 is bent outwards to fit a top end face of a through hole 21.

According to the application, the sealing rings 211 are sleeved in the through holes 21, the plurality of sealing rings 211 are arranged into an integral structure, and the top parts of the sealing rings 211 are outwards bent, so that the plurality of sealing rings 211 can be very easily integrally installed in the plurality of through holes 21 and just fit with the aperture of the inner wall of the through holes 21, the glue overflow of the through holes 21 into the liquid cooling cavity 22 can be prevented in the glue filling process above or below the through holes 21, and the installation process is greatly saved while the glue overflow at the through holes is avoided in the glue filling process.

Referring to fig. 2 and 3, fig. 2 is an exploded schematic view of an immersed liquid-cooled battery system according to an embodiment of the present application, and fig. 3 is a schematic view of a longitudinal section of fig. 2 according to an embodiment of the present application, in some embodiments of the present application, the immersed liquid-cooled battery system includes a plurality of tanks 2, a first side beam 3 and a second side beam 4, the first side beam 3 is installed at one end of the plurality of tanks 2, the second side beam 4 is installed at the other end of the plurality of tanks 2, an integrated inflow pipe 31 is disposed inside the first side beam 3, the integrated inflow pipe 31 is communicated with a plurality of liquid inlets 23, an integrated outflow pipe 41 is disposed inside the second side beam 4, and the integrated outflow pipe 41 is communicated with a plurality of liquid outlets 24.

It should be understood that the plurality of boxes 2 may be expanded along the same plane, or may be stacked along the vertical plane at the same time, so as to realize expansion, and accordingly, the first side beam 3 may be provided with a plurality of rows of ports of the integrated inflow pipes 31, and the second side beam 4 may be provided with a plurality of rows of ports of the integrated outflow pipes 41, so as to realize expansion of the plurality of boxes 2 along the vertical plane.

The application adopts the first side beam 3, the second side beam 4 and a plurality of boxes 2 to form the box body, the integrated inflow pipeline 31 is arranged in the first side beam 3, and the integrated outflow pipeline 41 is arranged in the second side beam 4, so that the application can realize the free combination of the unlimited number of boxes 2, the first side beam 3 and the second side beam 4 in a mode of cutting the lengths of the first side beam 3 and the second side beam 4, and is convenient for the expansion of the subsequent boxes 2.

In some embodiments of the present application, a first interface seal is connected between the inlet 23 and the integrated inlet conduit 31, and a second interface seal is connected between the outlet 24 and the integrated outlet conduit 41.

The first interface seal and the second interface seal may be gaskets interposed between the liquid inlet 23 and the first side frame 3, may be a glue layer provided on the inner side surface of the first side frame, or may be a seal ring between the liquid outlet 23 and the integrated inflow pipe 31.

The present application can make it difficult for the coolant leakage to occur in the connection between the integrated inflow pipe 31 and the liquid inlet 23 and the connection between the integrated outflow pipe 41 and the liquid outlet 24 by providing the first interface seal between the liquid inlet 23 and the integrated inflow pipe 31 and the second interface seal between the liquid outlet 24 and the integrated outflow pipe 41.

Referring to fig. 2, in some embodiments of the present application, two end surfaces of the tank 2 are opened, and the two end surfaces of the tank 2 form a liquid cooling cavity 22 with the first side beam 3 and the second side beam 4, respectively.

According to the application, the box body 2 is arranged as the box body with the two ends open, and the first side beam 3 and the second side beam 4 are additionally arranged, so that the lengths of the box bodies 2 and the lengths of the first side beam 3 and the second side beam 4 can be cut freely, and then the box bodies 2 are welded through the first side beam 3 and the second side beam 4 with the free cutting lengths, so that the capacity expansion of the liquid cooling module formed by the box bodies 2 along the length direction and the width direction of the battery system is realized.

Referring to fig. 5, in some embodiments of the present application, a reinforcing rib 221 is provided inside the case 2.

According to the application, the reinforcing ribs 221 are arranged in the shell of the box body 2, so that the shell of the box body 2 is difficult to deform when the battery cell 1 thermally expands and explodes or the box body is collided, the service life of the box body 2 is prolonged, in addition, a hollow structure can be arranged in the shell of the box body 2 for heat preservation of cooling liquid, and further, filling materials such as foaming glue and the like can be filled in the hollow structure to realize heat preservation of the liquid cooling cavity 22.

Referring to fig. 3, in some embodiments of the present application, the inner sides of the first side rail 3 and the second side rail 4 are provided with mounting grooves along the length direction of the first side rail 3 or the second side rail 4, and the mounting grooves are engaged with the ends of the case 2.

It should be understood that the mounting groove may be provided in a long groove shape or may be provided in a slot shape.

The mounting grooves are formed in the inner sides of the first side beams 3 and the second side beams 4 along the length direction, then the box bodies 2 are welded in the mounting grooves in the inner sides of the first side beams 3 and the second side beams 4 one by one, the height of the box bodies 2 is matched with the width in the grooves of the mounting grooves, so that the box bodies 2 can be positioned at the end parts of the box bodies 2 when the box bodies 2 are welded, all the box bodies 2 are convenient to install after the box bodies 2 are positioned on the same horizontal plane, and the second side beams 4 are not enough in connection strength between the box bodies 2 and the first side beams 3 and the second side beams 4 after being welded, but the box bodies 2 are prevented from being separated from the first side beams 3 and the second side beams 4 under the left and right limiting effect of the structure due to the upper limit effect and the lower limit effect of the mounting grooves and the connection effect of the box bodies 2 and the first side beams 3 and the second side beams 4, so that the box bodies 2 are prevented from falling off easily due to welding.

Referring to fig. 2, in some embodiments of the present application, a first welded end plate 32 is provided on one end surface of the tank 2, and a second welded end plate 42 is provided on the other end surface of the tank 2, so as to form the liquid cooling chamber 22.

Since the case 2 end surfaces of the first side sill 3 are directly welded, there is a possibility that the welding may be missed due to a welding leak caused by a welding leak tightness, and thus a cooling medium leakage may be caused.

Therefore, after cutting the two ends of the box body 2, the two ends of the box body 2 and the first welding end plate 32 and the second welding end plate 42 are welded to form a sealing structure, after checking the tightness of each box body 2, the box body 2 and the first side beam 3 and the second side beam 4 are welded, so that the tightness after welding between the box body 2 and the first side beam 3 and the second side beam 4 can be ensured as much as possible, and compared with the case body 2 which is directly arranged to form the sealing structure, the length of the box body 2 can be flexibly cut according to the needs.

In some embodiments of the present application, the case 2 is welded and fixed to the first side sill 3 and the second side sill 4.

According to the application, the box body 2, the first side beam 3 and the second side beam 4 are fixed through welding, so that the connection strength between the box body 2 and the first side beam 3 and the second side beam 4 can be ensured, and the service life of the whole battery system can be prolonged.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this application if there is a discrepancy or conflict between the description, definition, and/or use of the term in the appended claims.

The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims (10)

1. The utility model provides an submergence liquid cooling battery system, its characterized in that includes a plurality of electric core (1) and box (2), box (2) surface is provided with a plurality of through-holes (21), form liquid cooling cavity (22) in box (2), liquid cooling cavity (22) are inside to be used for circulating cooling medium, liquid cooling cavity (22) are provided with inlet (23) and leakage fluid dram (24), electric core (1) pass through-hole (21) and partly soak in the cooling medium of liquid cooling cavity (22).

2. The immersed battery system according to claim 1, wherein a plurality of through holes (21) are formed in a side wall of the case (2), one end of the battery cell (1) penetrates through the through holes (21) to be immersed in a cooling medium in the liquid cooling cavity (22), and the other end of the battery cell is located outside the liquid cooling cavity (22).

3. The submerged battery system according to claim 1, wherein the tank (2) has two side walls arranged opposite to each other, the plurality of through holes (21) being respectively located on the two side walls, the liquid cooling chamber (22) being formed between the two side walls; the battery cell (1) passes through the through holes (21) positioned on the side walls at two sides in sequence, the battery cell (1) is provided with a first end, a middle section and a second end which are sequentially arranged, the side walls at two sides of the box body (2) are positioned between the first end and the second end, and the middle section is immersed in a cooling medium of the liquid cooling cavity (22).

4. The submerged battery system according to claim 1, further comprising a glue filling layer (25), wherein the glue filling layer (25) is arranged on the surface of the box body (1) provided with the through hole (21) for forming a seal between the battery cell (1) and the through hole (21).

5. The immersed-liquid cooled battery system according to claim 1, wherein the battery cells (1) are laterally wrapped with an insulating film (11).

6. The immersed battery system according to claim 1, wherein a sealing ring (211) is sleeved between the through hole (21) and the electric core (1).

7. The immersed-liquid-cooled battery system according to claim 6, wherein a plurality of sealing rings (211) are of an integral structure which is sequentially connected, and the top edges of the sealing rings (211) are bent outwards to be attached to the top end surfaces of the through holes (21).

8. The immersed-liquid-cooled battery system according to claim 1, comprising a plurality of the tanks (2), a first side beam (3) and a second side beam (4), wherein the first side beam (3) is mounted at one end of a plurality of the tanks (2), the second side beam (4) is mounted at the other end of a plurality of the tanks (2), an integrated inflow pipe (31) is arranged inside the first side beam (3), the integrated inflow pipe (31) is communicated with a plurality of the liquid inlets (23), an integrated outflow pipe (41) is arranged inside the second side beam (4), and the integrated outflow pipe (41) is communicated with a plurality of the liquid outlets (24).

9. The submerged battery system according to claim 8, characterized in that a first interface seal is connected between the liquid inlet (23) and the integrated inflow conduit (31), and a second interface seal is connected between the liquid outlet (24) and the integrated outflow conduit (41).

10. The submerged battery system according to claim 8, wherein the tank body (2) has two end surfaces open, and the tank body (2) has two end surfaces respectively forming the liquid cooling cavity (22) with the first side beam (3) and the second side beam (4).