Fully-immersed battery pack and energy storage system

Abstract

The invention relates to the technical field of energy storage devices, and provides a fully-immersed battery pack and an energy storage system.The fully-immersed battery pack comprises a battery shell, and the battery shell is provided with a containing cavity; a plurality of battery cells are arranged in the accommodating cavity; the cold plates are arranged in the accommodating cavity, each cold plate is located between two adjacent battery cells, the plurality of battery cells which are longitudinally arranged form a plurality of longitudinal battery packs, the plurality of longitudinal battery packs are transversely arranged, the cold plates are vertically arranged, and the cold plates are arranged between every two adjacent longitudinal battery packs; and the cooling medium is uniformly spread in the accommodating cavity. According to the technical scheme, the problem that a battery pack and an energy storage system in the prior art have obvious insufficiency in the aspect of heat dissipation is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a fully immersed battery pack and an energy storage system. Background Art

[0002] With the rapid development of new energy technologies, battery packs and energy storage systems are increasingly used in the field of energy storage and utilization. In many scenarios such as electric vehicles and renewable energy storage, the performance and safety of battery packs are crucial. In battery packs and energy storage systems, good heat dissipation management is critical to ensuring battery performance, extending service life, and ensuring safe and stable operation of the system. However, existing battery packs and energy storage systems have obvious deficiencies in heat dissipation. At present, the common heat dissipation solution is to set cold plates on the upper and lower surfaces of the battery cells, and remove heat through the contact between the cold plates and the battery cells. However, this method has many problems. On the one hand, since the cold plate only contacts the upper and lower surfaces of the battery cell, the contact area with the battery cell is limited, resulting in poor cooling effect on the battery cell, making it difficult to quickly and effectively remove the heat generated by the battery cell, which easily causes the battery cell temperature to be too high, affecting battery performance and life. On the other hand, the existing cold plate has a low heat exchange efficiency with the outside world, and cannot quickly dissipate the heat absorbed from the battery cell, which greatly reduces the efficiency of the entire heat dissipation system. Summary of the invention

[0003] The present invention provides a fully immersed battery pack and energy storage system, which solves the problem that the battery pack and energy storage system in the related art are obviously insufficient in heat dissipation.

[0004] The technical solution of the present invention is as follows: A high-safety battery energy storage system, comprising: A battery case, the battery case having a receiving cavity; A plurality of battery cells are arranged in the accommodating cavity; A cold plate, the cold plate is arranged in the accommodating cavity, a plurality of the battery cells arranged longitudinally form a longitudinal battery group, the longitudinal battery group has a plurality of groups arranged transversely, the cold plate is arranged vertically, and the cold plate is arranged between each two adjacent groups of the longitudinal battery groups; A cooling medium is evenly distributed in the accommodating cavity.

[0005] As a further technical solution, the cold plate has a refrigerant cavity in which refrigerant flows. As a further technical solution, the cooling medium is gas or liquid.

[0006] As a further technical solution, the accommodating cavity has a refrigerant outlet and a refrigerant inlet, the refrigerant inlet and the refrigerant outlet are both connected to the refrigerant cavity, and the refrigerant is circulated and transported between the refrigerant outlet, the refrigerant cavity and the refrigerant inlet.

[0007] As a further technical solution, it also includes: A base frame is arranged on the bottom wall of the accommodating cavity, and a plurality of the battery cells are arranged on the base frame, and a first isolation gap is formed between the base frame and the bottom wall of the accommodating cavity.

[0008] As a further technical solution, it also includes: A spacer frame is disposed between two adjacent battery cells arranged in a longitudinal direction, and the spacer frame has a second isolation gap.

[0009] As a further technical solution, it also includes: An integrated frame, wherein the integrated frame has a peripheral portion, wherein the peripheral portion has a placement space inside, wherein the battery shell is located in the placement space, and the side walls around the battery shell abut against the inner wall of the peripheral portion; A support plate, wherein the support plate is arranged in the placement space, the support plate divides the placement space into two placement positions in the longitudinal direction, the battery shell is partially arranged in the placement position, both sides of the support plate have support parts, and there are multiple support parts, which are arranged in an array on the support plate, and the support parts on both sides of the support plate are respectively abutted against the side walls of the battery shell on one longitudinal side in the placement positions on both sides of the support plate, and the surrounding edge and the support plate have connecting holes.

[0010] The present invention further provides a fully submerged battery pack energy storage system, comprising any one of the fully submerged battery packs described above, wherein the battery shells are multiple, and further comprising: The arrangement rack has a placement space, the battery shells are spatially arranged in the placement space, and the placement space has a smoke exhaust port.

[0011] As a further technical solution, it also includes: A smoke exhaust valve is arranged on the smoke exhaust port.

[0012] As a further technical solution, it also includes: As a further technical solution, it also includes: A cooling machine, the cooling machine is arranged in the placement space, and the input end and the output end of the cooling machine are respectively connected to the accommodating cavity; A fire-fighting device is arranged in the placement space.

[0013] The working principle and beneficial effects of the present invention are: In the present invention, the battery case is in the shape of a rectangular parallelepiped and has a receiving cavity inside. Several battery cells are neatly arranged in the receiving cavity. The cold plate is in the shape of a thin sheet and is arranged between two adjacent battery cells in the receiving cavity. When the battery pack is working, the battery cell generates heat, and the heat is transferred to the cooling medium that soaks the battery cell. The heat of the cooling medium is transferred, and the vertical cold plate is immersed in the cooling medium. The cold plate is located between adjacent battery cells. The vertical setting increases the contact area between the cold plate and the cooling medium, which can more effectively absorb the heat generated by the battery cell, improve the cooling effect, and is conducive to extending the service life of the battery cell and maintaining stable performance. This structural layout is reasonable, fully utilizes the space inside the battery case, and will not significantly increase the volume of the battery pack. The setting of multiple cold plates can make the temperature distribution between the battery cells more uniform, avoid local overheating, and thus improve the safety and reliability of the entire battery pack. The charging and discharging efficiency of the battery pack is improved, and the performance degradation caused by excessive temperature is reduced. It helps to reduce the risk of thermal runaway of the battery pack and ensure safe operation under various working conditions. When the battery pack is working, the battery cell generates heat, and the heat is transferred to the cooling medium, and the heat of the cooling medium is adjacent to the cold plate. This grouping arrangement and cold plate setting method further increases the contact area between the cold plate and the battery cell and improves the cooling efficiency. It can dissipate heat for the entire battery pack more evenly to avoid local overheating. It adapts to the layout requirements of large-scale battery packs and makes the heat dissipation system more efficient and reliable. It is convenient for modular design and maintenance of battery packs, reducing costs and maintenance difficulties. It improves the space utilization of the battery pack and achieves better heat dissipation in a limited space. Compared with the cold plates set on the upper and lower end surfaces of the battery cell in the prior art, the cold plates of this solution are set in the interval and the cooling medium is set, which greatly eliminates the temperature difference in different spatial positions inside the battery cell, improves the consistency of the internal temperature, and further improves the cooling efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0015] Figure 1 This is a schematic diagram of the external structure of the battery shell in the present invention; Figure 2 This is a schematic diagram of the internal structure of the battery case in the present invention; Figure 3 This is another schematic diagram of the structure inside the battery case of the present invention; Figure 4 for Figure 3 A partial enlarged structural diagram of the middle part; Figure 5 This is a schematic diagram of the structure of the battery cell, the base frame and the spacer frame from independent perspectives in the present invention; Figure 6It is a schematic diagram of the internal viewing angle structure of the arrangement frame in the present invention; Figure 7 This is a schematic diagram of the longitudinal battery pack structure in Example 2 of the present invention; Figure 8 This is a schematic diagram of the integrated frame structure in Example 2 of the present invention.

[0016] In the figure: battery shell -1, accommodating cavity -101, refrigerant inlet -102, refrigerant outlet -103, battery cell -2, longitudinal battery pack -201, cold plate -3, refrigerant cavity -301, cooling medium -4, smoke exhaust valve -5, base frame -6, first isolation gap -601, spacing frame -7, second isolation gap -701, arrangement frame -8, placement space -801, smoke exhaust port -802, cold machine -9, fire fighting device -10, integrated frame -11, surrounding edge portion -1101, placement space -1102, support plate -12, placement position -1103, support portion -1201, connecting hole -1202. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0018] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0019] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0021] Example 1 Reference Figure 1 to Figure 6 The first embodiment of the present invention proposes a fully immersed battery pack, including a battery shell 1, the battery shell 1 has a receiving cavity 101; there are a plurality of battery cells 2 arranged in the receiving cavity 101; a cold plate 3 is arranged in the receiving cavity 101, and a plurality of battery cells 2 arranged longitudinally form a longitudinal battery group 201, and the longitudinal battery group 201 has a plurality of groups arranged in the transverse direction, and the cold plate 3 is arranged vertically, and a cold plate 3 is arranged between each two adjacent longitudinal battery groups 201; a cooling medium 4 is evenly distributed in the receiving cavity 101.

[0022] In this embodiment, the battery shell 1 is in the shape of a rectangular parallelepiped and has a receiving cavity 101 inside. Several battery cells 2 are neatly arranged in the receiving cavity 101. The cold plate 3 is in the shape of a thin sheet and is arranged between two adjacent battery cells 2 in the receiving cavity 101. The cooling medium 4 is evenly distributed in the entire receiving cavity 101. When the battery pack is working, the battery cell 2 generates heat, and the heat is transferred to the cooling medium 4 that immerses the battery cell 2, and the cooling medium 4 is then transferred to the cold plate 3 immersed in the cooling medium 4. The cold plate 3 is located between adjacent battery cells 2, and the contact area with the battery cell 2 is increased by the cooling medium 4, which can more effectively absorb the heat generated by the battery cell 2, improve the cooling effect, and help to extend the service life of the battery cell 2 and maintain stable performance. This structural layout is reasonable, fully utilizes the space inside the battery shell 1, and will not significantly increase the volume of the battery pack. The setting of multiple cold plates 3 can make the temperature distribution between the battery cells 2 more uniform, avoid local overheating, and thus improve the safety and reliability of the entire battery pack. Improve the charging and discharging efficiency of the battery pack and reduce the performance degradation caused by excessive temperature. It helps to reduce the risk of thermal runaway of the battery pack and ensure safe operation under various working conditions. Compared with the cold plate 3 set on the upper and lower end surfaces of the battery cell 2 in the prior art, the cold plate 3 of this solution is set in the interval and the cooling medium 4 is set, which greatly eliminates the temperature difference between different spatial positions inside the battery cell 2, improves the consistency of the internal temperature, and further improves the cooling efficiency of the battery cell 3.

[0023] Furthermore, the cold plate 3 has a coolant cavity 301 in which coolant flows.

[0024] In this embodiment, there is flowing refrigerant in the refrigerant cavity 301 of the cold plate 3. The flow of the refrigerant in the refrigerant cavity 301 further enhances the heat absorption capacity of the cold plate 3, and the cooling medium 4 is evenly distributed throughout the accommodating cavity 101. The heat exchange coordination between the refrigerant and the cooling medium 4 further enhances the absorption and transfer of heat from the battery cell 2, thereby greatly improving the heat dissipation efficiency.

[0025] Furthermore, the cooling medium 4 is gas or liquid.

[0026] In this embodiment, the cooling medium 4 generally uses two types of liquid materials, hydrocarbon and organic silicon compounds such as silicone oil coolant and fluorocarbon compounds such as fluorinated liquid. The former is natural mineral oil, which is viscous at room temperature, has high specific heat capacity and thermal conductivity, high boiling point, is not easy to volatilize, does not corrode metals, is environmentally friendly, and has low toxicity; synthetic oil has good thermal stability and lubricity, etc., which can meet the heat dissipation requirements of different equipment; organic silicon oil has good chemical stability and excellent insulation performance, and can maintain good performance in high and low temperature environments. Electronic fluorinated liquid is known for its excellent chemical inertness, excellent thermal conductivity and non-flammability, and has no corrosion. It is an ideal heat dissipation medium for sensitive electronic equipment. At the same time, in the experiment, helium and other gases with good thermal conductivity and state stability were tried as cooling medium 4, which can also achieve a relatively ideal effect. For example, helium has excellent thermal conductivity, which is one of the best thermal conductivity among all gases. It can quickly transfer the heat generated by the battery cell and has high heat dissipation efficiency. The chemical properties are extremely stable, and it will not react chemically with the materials in the battery pack, and it is highly safe. In consideration of cost and benefit, silicone oil coolant is generally used more often.

[0027] Furthermore, the accommodating chamber 101 has a refrigerant outlet 103 and a refrigerant inlet 102 . Both the refrigerant inlet 102 and the refrigerant outlet 103 are connected to the refrigerant chamber 301 , and the refrigerant is circulated and transported among the refrigerant outlet 103 , the refrigerant chamber 301 and the refrigerant inlet 102 .

[0028] In this embodiment, when the battery pack is working, the refrigerant flows into the refrigerant cavity 301 from the refrigerant inlet 102. Then, the refrigerant flows out from the refrigerant outlet 103. After the outflowing refrigerant is cooled by the external cooling device, it flows back to the refrigerant cavity 301 from the refrigerant inlet 102 again, and the cycle repeats.

[0029] This circulation and transportation design enables the refrigerant to continuously and efficiently take away the heat absorbed by the cold plate 3. At the same time, the cooling medium 4 evenly distributed in the accommodating cavity 101 also plays an important role. When the battery pack generates a lot of heat during operation, the refrigerant quickly absorbs the heat of the cold plate 3, while the cooling medium 4 quickly absorbs the heat around the battery cell 2. The two work together to greatly improve the heat dissipation efficiency. When the ambient temperature is high or the battery pack is running at high power, the refrigerant and the cooling medium 4 work together to ensure that the heat is quickly taken away and the temperature of the battery pack is maintained stable; in a low temperature environment or low power operation, the cooperation between the two can be adjusted according to actual conditions to reduce system energy consumption while still ensuring good heat dissipation. This synergistic effect can be evenly distributed throughout the accommodating cavity 101, avoiding the situation where the local temperature is too high or too low, further improving the temperature consistency of the battery pack, helping to extend the service life of the battery cell 2, and improving the performance and reliability of the battery pack.

[0030] Furthermore, a bottom frame 6 is included. The bottom frame 6 is arranged on the bottom wall of the accommodating cavity 101 . A plurality of battery cells 2 are arranged on the bottom frame 6 . A first isolation gap 601 is formed between the bottom frame 6 and the bottom wall of the accommodating cavity 101 .

[0031] In this embodiment, the base frame 6 is installed on the bottom wall in the accommodating cavity 101 of the battery shell 1. A plurality of battery cells 2 are neatly arranged on the base frame 6, and a first isolation gap 601 is formed between the base frame 6 and the bottom wall of the accommodating cavity 101. During the operation of the battery pack, the base frame 6 plays a role in supporting and fixing the battery cells 2. The first isolation gap 601 provides a certain heat dissipation space for the bottom of the battery pack, which helps to improve the heat dissipation efficiency of the bottom. It can prevent moisture, impurities, etc. on the bottom wall of the accommodating cavity 101 from directly contacting the battery cells 2, reducing damage to the battery cells 2. The base frame 6 provides a more stable support for the battery cells 2, reduces the vibration and displacement of the battery cells 2 during operation, and improves the stability of the battery pack.

[0032] Furthermore, a spacer frame 7 is included. The spacer frame 7 is arranged between two adjacent battery cells 2 arranged in the longitudinal direction. The spacer frame 7 has a second isolation gap 701 .

[0033] In this embodiment, the battery cells 2 are arranged longitudinally in the accommodating cavity 101 of the battery shell 1. The spacer 7 is arranged between two adjacent battery cells 2 arranged longitudinally, and the spacer 7 has a second isolation gap 701. When the battery pack is working, the spacer 7 plays the role of separating and fixing the battery cells 2. The second isolation gap 701 is conducive to the heat dissipation between the battery cells 2, and improves the longitudinal heat dissipation effect of the battery cells 2. It can avoid direct contact and extrusion between adjacent battery cells 2, and reduce the wear and failure risks of the battery cells 2. When the battery cell 2 is damaged and expanded, the second isolation gap 701 provides a certain space for the expansion of the battery cell 2, reducing the risk of more serious damage or even explosion caused by mutual compression of the battery cell 2 due to expansion. The stability of the arrangement of the battery cell 2 is enhanced to prevent the displacement and collision of the battery cell 2 during use. Among them, the spacer 7 and the base frame 6 can be an integrated structure or a split structure. The split structure can adapt to a more complex installation environment, and the integrated structure can improve the efficiency of production and installation.

[0034] Example 2 Reference Figure 7~Figure 8, which is another embodiment of the present invention, further includes an integrated frame 11, the integrated frame 11 has a surrounding edge portion 1101, and the surrounding edge portion 1101 has a placement space 1102 inside, the battery cell 2 is located in the placement space 1102, and the side walls around the battery cell 2 are abutted against the inner wall of the surrounding edge portion 1101; the support plate 12 is arranged in the placement space 1102, the support plate 12 divides the placement space 1102 into two placement positions 1103 in the longitudinal direction, the battery cell 2 is partially arranged in the placement position 1103, both sides of the support plate 12 have support portions 1201, there are a plurality of support portions 1201, which are arrayed on the support plate 12, the support portions 1201 on both sides of the support plate 12 are respectively abutted against the side walls of the battery cell 2 on one side of the longitudinal direction in the placement positions 1103 on both sides of the support plate 12, and the surrounding edge portion 1101 and the support plate 12 are provided with connecting holes 1202.

[0035] In this embodiment, in actual use, the integrated frame 11 and the support plate 12 provide stable support and protection for the battery cell 2. The inner wall of the surrounding edge portion 1101 abuts against the side wall of the battery cell 2 to limit the lateral movement of the battery cell 2, and the support portion 1201 on both sides of the support plate 12 abuts against the side wall of the battery cell 2 to limit the longitudinal movement of the battery cell 2, thereby ensuring the position stability of the battery cell 2 during operation. The connecting hole 1202 is used to ensure the circulation of cooling medium and heat. The combined structure of the integrated frame 11 and the support plate 12 provides a full range of stable support for the battery cell 2, effectively preventing the battery cell 2 from displacement and shaking under various working conditions, and improving the overall stability and reliability of the battery pack. Secondly, by limiting the position of the battery cell 2, the risk of damage to the internal structure of the battery due to vibration and collision is reduced, and the service life of the battery is extended. At the same time, the support portion 1201 distributed throughout the array abuts against a small area of ​​the side wall of the battery cell 2 to ensure sufficient heat dissipation efficiency of the battery cell 2.

[0036] This embodiment also proposes a fully submerged battery pack energy storage system, including the above-mentioned fully submerged battery pack, a plurality of battery shells 1, and an arrangement rack 8, the arrangement rack 8 has a placement space 801, the battery shells 1 are spatially arranged in the placement space 801, and the placement space 801 has a smoke exhaust port 802.

[0037] In this embodiment, multiple battery shells 1 are spatially arranged by an arrangement rack 8, which improves space utilization and enables the energy storage system to accommodate more battery packs in a limited space, thereby increasing the energy storage capacity. Reasonable arrangement helps to optimize the connection and management between battery packs, reducing the complexity and failure rate of the system. It is convenient to centrally monitor and maintain the battery packs, improving operation and maintenance efficiency. Flexible arrangement methods can adapt to different installation environments and requirements, and improve the versatility of the energy storage system. The smoke exhaust port 802 of the placement space 801 can exhaust smoke in time when needed.

[0038] Furthermore, it also includes a smoke exhaust valve 5 , which is arranged on the smoke exhaust port 802 .

[0039] In this embodiment, when an abnormality occurs inside the energy storage system, such as a serious situation such as thermal runaway, the generated smoke and gas can be discharged through the smoke exhaust port 802. Under normal circumstances, the smoke exhaust valve 5 is in a closed state; under abnormal circumstances, the smoke exhaust valve 5 is opened. The setting of the smoke exhaust port 802 and the smoke exhaust valve 5 can timely discharge the smoke and harmful gases abnormally generated inside the energy storage system and reduce safety risks. It effectively prevents the accumulation of smoke and harmful gases inside the energy storage system and reduces damage to the battery cells 2 and other components. It improves the safety of the energy storage system under abnormal circumstances and buys time for personnel evacuation and emergency handling. The smoke exhaust valve 5 can remain closed under normal circumstances to prevent external impurities from entering the placement space 801 and ensure the normal operating environment of the energy storage system. It enhances the safety protection performance of the energy storage system and improves the reliability and stability of the entire system.

[0040] It also includes a refrigerator 9, which is arranged in the placement space 801, and the input end and the output end of the refrigerator 9 are both connected to the accommodating cavity 101; the fire-fighting device 10 is arranged in the placement space 801.

[0041] In this embodiment, specifically, the input and output ends of the refrigerator 9 are both connected to the refrigerant outlet 103 and the refrigerant inlet 102; when the energy storage system is working, the refrigerator 9 is running, the refrigerant flows out from the refrigerant outlet 103 and enters the refrigerator 9 to be cooled, and then flows out from the output end of the refrigerator 9, and returns to the accommodating cavity 101 of the battery shell 1 through the refrigerant inlet 102, forming a cooling cycle of the refrigerant. When a fire hazard or fire occurs in the energy storage system, the fire fighting device 10 is activated to extinguish the fire. The setting of the refrigerator 9 can cool the refrigerant more efficiently, further improve the heat dissipation effect of the battery pack, ensure that the energy storage system can still maintain a suitable temperature when running at high load, extend the battery life and improve performance. The connection mode with the refrigerant outlet 103 and the refrigerant inlet 102 makes the cooling cycle of the refrigerant smoother and more controllable, which is conducive to accurately adjusting the temperature of the energy storage system. The configuration of the fire fighting device 10 greatly improves the safety of the energy storage system, and can respond promptly in the early stage of a fire to reduce losses. The ability of the energy storage system to cope with emergencies is enhanced, and the degree of damage to the entire system caused by accidents such as fire is reduced.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fully immersed battery pack, characterized in that: include: A battery case (1), the battery case (1) having a containing cavity (101); Battery cells (2), the battery cells (2) being a plurality and arranged in the accommodating cavity (101); A cold plate (3), the cold plate (3) being arranged in the accommodating cavity (101), the plurality of battery cells (2) arranged longitudinally forming a longitudinal battery group (201), the longitudinal battery group (201) comprising a plurality of groups arranged transversely, the cold plate (3) being arranged vertically, and the cold plate (3) being arranged between each two adjacent groups of the longitudinal battery groups (201); A cooling medium (4), wherein the cooling medium (4) is evenly distributed in the accommodating cavity (101).

2. A fully submersible battery pack according to claim 1, characterized in that: The cold plate (3) has a refrigerant cavity (301), and a refrigerant is flowed in the refrigerant cavity (301).

3. A fully submersible battery pack according to claim 2, characterized in that: The cooling medium (4) is gas or liquid.

4. A fully submersible battery pack according to claim 2, characterized in that: The accommodating cavity (101) has a refrigerant outlet (103) and a refrigerant inlet (102); the refrigerant inlet (102) and the refrigerant outlet (103) are both connected to the refrigerant cavity (301); and the refrigerant is circulated and transported between the refrigerant outlet (103), the refrigerant cavity (301) and the refrigerant inlet (102).

5. A fully submersible battery pack according to claim 1, characterized in that: Also includes: A bottom frame (6), the bottom frame (6) being arranged on the bottom wall of the accommodating cavity (101), the plurality of battery cells (2) being arranged on the bottom frame (6), and a first isolation gap (601) being formed between the bottom frame (6) and the bottom wall of the accommodating cavity (101).

6. A fully submersible battery pack according to claim 1, characterized in that: Also includes: A spacer (7), the spacer (7) being arranged between two adjacent battery cells (2) arranged in a longitudinal direction, the spacer (7) having a second isolation gap (701).

7. A fully submersible battery pack according to claim 1, characterized in that: Also includes: An integrated frame (11), the integrated frame (11) having a peripheral edge portion (1101), the peripheral edge portion (1101) having an accommodation space (1102) inside, the battery cell (2) being located in the accommodation space (1102), and the side walls around the battery cell (2) being in contact with the inner wall of the peripheral edge portion (1101); A support plate (12), the support plate (12) being arranged in the placement space (1102), the support plate (12) dividing the placement space (1102) into two placement positions (1103) in the longitudinal direction, the battery cell (2) being partially arranged in the placement position (1103), both sides of the support plate (12) having support portions (1201), the support portions (1201) being a plurality and arranged in an array on the support plate (12), the support portions (1201) on both sides of the support plate (12) respectively abutting against side walls on one side of the longitudinal direction of the battery cell (2) in the placement positions (1103) on both sides of the support plate (12), and both the surrounding edge portion (1101) and the support plate (12) having connecting holes (1202).

8. A fully submersible battery pack energy storage system, comprising a fully submersible battery pack according to any one of claims 1 to 7, characterized in that: The battery shell (1) is a plurality of battery shells, and further comprises: An arrangement rack (8), the arrangement rack (8) having a placement space (801), the battery shells (1) being spatially arranged in the placement space (801), and the placement space (801) having a smoke exhaust port (802).

9. A fully submerged battery energy storage system according to claim 8, characterized in that: Also includes: A smoke exhaust valve (5), wherein the smoke exhaust valve (5) is arranged on the smoke exhaust port (802).

10. A fully submerged battery energy storage system according to claim 8, characterized in that: Also includes: A cooling machine (9), the cooling machine (9) being arranged in the placement space (801), the input end and the output end of the cooling machine (9) both being in communication with the accommodating cavity (101); A fire-fighting device (10), wherein the fire-fighting device (10) is arranged in the placement space (801).

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