A fully immersed battery pack and energy storage system

Abstract

The application relates to the technical field of energy storage devices, and discloses a fully-submerged battery pack and an energy storage system, which comprises a battery shell, the battery shell is provided with a containing cavity, a plurality of battery cells are arranged in the containing cavity, a cold plate is arranged in the containing cavity and is located between two adjacent battery cells, a plurality of longitudinally-arranged battery cells form a longitudinal battery pack, a plurality of longitudinal battery packs are arranged in a transverse direction, the cold plate is vertically arranged, a cold plate is arranged between every two adjacent longitudinal battery packs, and cooling medium is uniformly distributed in the containing cavity. The above technical scheme solves the problem of obvious deficiency of the battery pack and the energy storage system in the prior art in terms of heat dissipation.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of new energy technology, battery packs and energy storage systems are increasingly widely 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 of key importance to ensure the performance of the battery, prolong the service life, and ensure the safe and stable operation of the system. However, the existing battery packs and energy storage systems have obvious shortcomings in heat dissipation. The common heat dissipation scheme is to set a cold plate on the upper and lower surfaces of the battery cell, and to take away the heat through the contact between the cold plate and the battery cell. 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 is limited, resulting in poor cooling effect of the battery cell, and it is difficult to quickly and effectively take away the heat generated by the battery cell, which may cause the battery cell temperature to be too high, affecting the battery performance and life. On the other hand, the existing cold plate has low heat exchange efficiency with the outside, and cannot quickly dissipate the heat absorbed from the battery cell, which greatly reduces the efficiency of the entire heat dissipation system. SUMMARY

[0003] The present application proposes a fully immersed battery pack and energy storage system, which solves the problem of obvious shortcomings in heat dissipation of battery packs and energy storage systems in related technologies.

[0004] The technical solutions of the present application are as follows:

[0005] A high-safety battery pack energy storage system, comprising:

[0006] A battery shell having a receiving cavity;

[0007] Battery cells, the battery cells are arranged in the receiving cavity;

[0008] A cold plate is arranged in the receiving cavity, and a plurality of longitudinally arranged battery cells form a longitudinal battery pack, the longitudinal battery pack is arranged in a plurality of groups along the transverse direction, and the cold plate is arranged vertically between each two adjacent groups of longitudinal battery packs;

[0009] A cooling medium is uniformly distributed in the receiving cavity.

[0010] As a further technical solution, the cold plate has a refrigerant cavity, and a refrigerant flows in the refrigerant cavity. As a further technical solution, the cooling medium is a gas or a liquid.

[0011] As a further technical solution, the accommodating cavity has a refrigerant outlet and a refrigerant inlet, both of which communicate with the refrigerant cavity, and the refrigerant is circulated between the refrigerant outlet, the refrigerant cavity and the refrigerant inlet.

[0012] As a further technical solution, it also includes:

[0013] The bottom frame is arranged on the bottom wall of the accommodating cavity, and the plurality of battery cells are arranged on the bottom frame, and a first isolation gap is formed between the bottom frame and the bottom wall of the accommodating cavity.

[0014] As a further technical solution, it also includes:

[0015] The spacing frame is arranged between the two adjacent battery cells arranged longitudinally, and the spacing frame has a second isolation gap.

[0016] As a further technical solution, it also includes:

[0017] The integrated frame has a surrounding edge portion, and the surrounding edge portion has an accommodation space inside, and the battery shell is located in the accommodation space, and the side wall around the battery shell abuts against the inner wall of the surrounding edge portion.

[0018] The support plate is arranged in the accommodation space, and the support plate divides the accommodation space longitudinally into two accommodation positions, and the battery shell is partially arranged in the accommodation position, and the support plate has a support portion on both sides, and the support portion is arranged in an array on the support plate, and the support portion on both sides of the support plate abuts against the side wall of the battery shell on the longitudinal side in the accommodation position on both sides of the support plate, and the surrounding edge portion and the support plate both have a communication hole.

[0019] The application also provides a full-immersion battery pack energy storage system, which includes any one of the full-immersion battery packs, and the battery shell is a plurality of battery shells, and the full-immersion battery pack energy storage system also includes:

[0020] The arrangement frame has a placement space, and the battery shells are arranged in the placement space, and the placement space has a smoke exhaust port.

[0021] As a further technical solution, it also includes:

[0022] The smoke exhaust valve is arranged on the smoke exhaust port.

[0023] As a further technical solution, it also includes:

[0024] As a further technical solution, it also includes:

[0025] A cooling machine is arranged in the placing space, and the input end and the output end of the cooling machine are communicated with the accommodating cavity respectively.

[0026] A fire-fighting device is arranged in the placing space.

[0027] The working principle and advantages of the present application are as follows:

[0028] In the present application, the battery shell is in the shape of a cuboid, and has an accommodating cavity inside. A plurality of battery cells are arranged in the accommodating cavity in an orderly manner. The cold plate is in the shape of a sheet and is arranged between two adjacent battery cells in the accommodating cavity. When the battery pack is working, the battery cells generate heat, which is transferred to the cooling medium soaked in the battery cells. The heat of the cooling medium is transferred to the cold plate immersed vertically in the cooling medium. The cold plate is located between the adjacent battery cells and is arranged vertically to increase the contact area between the cold plate and the cooling medium, so that the heat generated by the battery cells can be absorbed more effectively, the cooling effect is improved, and the service life and performance stability of the battery cells are prolonged. This structural layout is reasonable and makes full use of the space inside the battery shell without significantly increasing the volume of the battery pack. The arrangement of multiple cold plates can make the temperature distribution between the battery cells more uniform and avoid local overheating, thereby improving 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 ensures safe operation under various working conditions. When the battery pack is working, the battery cells generate heat, which is transferred to the cooling medium, and the heat of the cooling medium is transferred to the adjacent cold plate. This grouping arrangement and cold plate arrangement further increase the contact area between the cold plate and the battery cells, improve the cooling efficiency, and more evenly cool the entire battery pack to avoid local overheating. It meets the layout requirements of large-scale battery packs, making the cooling system more efficient and reliable. It is convenient for modular design and maintenance of the battery pack, reduces the cost and maintenance difficulty, and improves the space utilization rate of the battery pack to achieve better cooling effect in limited space. Compared with the cold plate arranged on the upper and lower end faces of the battery cells in the prior art, the cold plate arrangement in the present application and the arrangement of the cooling medium greatly eliminate the temperature difference existing in different space positions inside the battery cells, improve the consistency of the internal temperature, and further improve the cooling efficiency of the battery cells. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above-mentioned features, technical characteristics, advantages and implementation modes of the present application will be further described in the following preferred embodiments in a clear and understandable manner combined with the accompanying drawings.

[0030] Figure 1 It is an external structure diagram of the battery shell in the present application.

[0031] Figure 2 It is an internal structure diagram of the battery shell in the present application.

[0032] Figure 3 Figure 6 is another structural schematic diagram of the battery shell inside in the present application;

[0033] Figure 4 Figure 7 is a structural schematic diagram of the A part in the present application; Figure 3

[0034] Figure 5 Figure 8 is a structural schematic diagram of the battery cell, the bottom frame and the spacing frame in the present application from an independent perspective;

[0035] Figure 6 Figure 9 is a structural schematic diagram of the arrangement frame inside in the present application from a perspective;

[0036] Figure 7 Figure 10 is a structural schematic diagram of the longitudinal battery group in the embodiment 2 of the present application;

[0037] Figure 8 Figure 11 is a structural schematic diagram of the integrated frame in the embodiment 2 of the present application.

[0038] In the figure: battery shell-1, containing cavity-101, refrigerant inlet-102, refrigerant outlet-103, battery cell-2, longitudinal battery group-201, cold plate-3, refrigerant cavity-301, cooling medium-4, smoke exhaust valve-5, bottom frame-6, first isolation gap-601, spacing frame-7, second isolation gap-701, arrangement frame-8, placement space-801, smoke exhaust port-802, cooling machine-9, fire-fighting device-10, integrated frame-11, surrounding edge part-1101, placement space-1102, support plate-12, placement site-1103, support part-1201, communication hole-1202. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings and other embodiments according to these drawings without creative labor.

[0040] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0041] ​In this article, it is necessary to explain that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0043] Embodiment 1

[0044] Reference Figures 1-6 The first embodiment of the present application proposes a full immersion battery pack, comprising a battery shell 1, the battery shell 1 has a containing cavity 101; a plurality of battery cells 2 are arranged in the containing cavity 101; a cold plate 3 is arranged in the containing cavity 101, and a plurality of longitudinally arranged battery cells 2 form a longitudinal battery pack 201, and the longitudinal battery pack 201 is arranged in a plurality of groups along the transverse direction, and the cold plate 3 is arranged vertically, and the cold plate 3 is arranged between every two adjacent groups of longitudinal battery packs 201; and the cooling medium 4 is uniformly distributed in the containing cavity 101.

[0045] In this embodiment, the battery shell 1 is a rectangular parallelepiped, and has a containing cavity 101 inside. A plurality of battery cells 2 are arranged in the containing cavity 101. The cold plate 3 is in the form of a sheet, and is arranged between two adjacent battery cells 2 in the containing cavity 101. The cooling medium 4 is uniformly distributed in the entire containing cavity 101. When the battery pack is working, the battery cells 2 generate heat, which is transferred to the cooling medium 4 that immerses the battery cells 2, and then the cooling medium 4 is transferred to the cold plate 3 immersed by the cooling medium 4. The cold plate 3 is located between the adjacent battery cells 2, and the contact area with the battery cells 2 is increased through the cooling medium 4, which can more effectively absorb the heat generated by the battery cells 2, improve the cooling effect, and is beneficial to prolong the service life and maintain the performance stability of the battery cells 2. This structure is reasonable in layout, fully utilizes the space inside the battery shell 1, and does not significantly increase the volume of the battery pack. The arrangement 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. The charging and discharging efficiency of the battery pack is improved, and the performance decline caused by high temperature is reduced. It helps to reduce the risk of thermal runaway of the battery pack and ensures safe operation under various working conditions. Compared with the cold plate 3 arranged on the upper and lower end faces of the battery cell 2 in the prior art, the cold plate 3 of the present scheme is arranged in the interval and the cooling medium 4 is arranged, which greatly eliminates the temperature difference existing in different space positions inside the battery cell 2, improves the consistency of the internal temperature, and further improves the cooling efficiency of the battery cell 3.

[0046] Further, the cold plate 3 has a refrigerant cavity 301 in which a refrigerant flows.

[0047] In this embodiment, the refrigerant flowing in the refrigerant cavity 301 of the cold plate 3 further enhances the heat absorption capacity of the cold plate 3, and the uniform distribution of the cooling medium 4 in the accommodation cavity 101 and the heat exchange cooperation between the refrigerant and the cooling medium 4 further enhance the absorption and transfer of heat from the battery cell 2, greatly improving the heat dissipation efficiency.

[0048] Further, the cooling medium 4 is a gas or a liquid.

[0049] In this embodiment, the cooling medium 4 generally uses two types of liquid materials, such as hydrocarbon and organosilicon compounds, such as silicone oil coolant, and carbon fluoride 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 and is not easy to evaporate, does not corrode metal, is environmentally friendly, and has low toxicity. Synthetic oil has good thermal stability and lubricity, etc., and can meet the heat dissipation needs of different equipment. Silicone 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 performance, which is an ideal heat dissipation medium for sensitive electronic equipment. In experiments, gases with good thermal conductivity and stable state, such as helium, are also used as cooling medium 4, which can also achieve ideal results. Helium has excellent thermal conductivity and is one of the best thermal conductive gases, which can quickly transfer the heat generated by the battery cell to the outside, and has high heat dissipation efficiency. It is extremely stable in chemical properties and will not react with the materials in the battery pack, so it is safe. In the comprehensive consideration of cost and benefit, silicone oil coolant is more commonly used.

[0050] Further, the accommodation cavity 101 has a refrigerant outlet 103 and a refrigerant inlet 102, both of which are in communication with the refrigerant cavity 301, and the refrigerant is circulated between the refrigerant outlet 103, the refrigerant cavity 301 and the refrigerant inlet 102.

[0051] In this embodiment, when the battery pack is working, the refrigerant flows from the refrigerant inlet 102 into the refrigerant cavity 301. Then, the refrigerant flows out of the refrigerant outlet 103. The outflowing refrigerant is cooled by an external cooling treatment device and then flows back into the refrigerant cavity 301 through the refrigerant inlet 102, and so on.

[0052] The circulating 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 containing cavity 101 also plays an important role. When the battery pack generates a large amount 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, and 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 stable; when the ambient temperature is low or the battery pack is running at low power, the cooperation of the two can be adjusted according to the actual situation to reduce the system energy consumption, while still ensuring good heat dissipation effect. This synergistic effect can be evenly distributed in the entire containing cavity 101, avoiding the situation of local high or low temperature, further improving the temperature consistency of the battery pack, helping to prolong the service life of the battery cell 2, and improving the performance and reliability of the battery pack.

[0053] Further, the bottom frame 6 is arranged on the bottom wall of the containing cavity 101, and the plurality of battery cells 2 are arranged on the bottom frame 6, and the first isolation gap 601 is formed between the bottom frame 6 and the bottom wall of the containing cavity 101.

[0054] In this embodiment, the bottom frame 6 is installed on the bottom wall in the containing cavity 101 of the battery shell 1. The plurality of battery cells 2 are arranged on the bottom frame 6, and the first isolation gap 601 is formed between the bottom frame 6 and the bottom wall of the containing cavity 101. During the operation of the battery pack, the bottom 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 and the like on the bottom wall of the containing cavity 101 from directly contacting the battery cells 2, thereby reducing damage to the battery cells 2. The support of the bottom frame 6 to the battery cells 2 is more stable, which reduces the vibration and displacement of the battery cells 2 during operation, and improves the stability of the battery pack.

[0055] Further, the spacer frame 7 is arranged between the two adjacent battery cells 2 arranged in the longitudinal direction, and the second isolation gap 701 is formed in the spacer frame 7.

[0056] In the 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. The spacer 7 plays a role of separating and fixing the battery cells 2 when the battery pack is working. The second isolation gap 701 is beneficial to heat dissipation between the battery cells 2, and improves the heat dissipation effect of the battery cells 2 longitudinally. Direct contact and extrusion between adjacent battery cells 2 can be avoided, and the wear and failure risk of the battery cells 2 can be reduced. When the battery cells 2 are damaged and swell, the second isolation gap 701 provides a certain space for the swelling of the battery cells 2, and reduces the risk of more serious damage or even explosion of the battery cells 2 due to extrusion of the battery cells 2. The stability of the arrangement of the battery cells 2 is enhanced, and displacement and collision of the battery cells 2 during use are prevented. The spacer 7 and the bottom frame 6 can be an integrated structure or a split structure. The split structure can adapt to more complex installation environment, and the integrated structure can improve the production and installation efficiency.

[0057] Embodiment 2

[0058] With reference to Figures 7-8 For another embodiment of the application, further comprising an integrated frame 11, the integrated frame 11 has a surrounding edge part 1101, the surrounding edge part 1101 has a placement space 1102 inside, the battery cell 2 is located in the placement space 1102, and the side wall around the battery cell 2 abuts against the inner wall of the surrounding edge part 1101; the support plate 12 is arranged in the placement space 1102, the support plate 12 longitudinally divides the placement space 1102 into two placement positions 1103, the battery cell 2 is partially arranged in the placement position 1103, the support plate 12 has a support part 1201 on both sides, the support part 1201 is arranged in an array on the support plate 12, the support part 1201 on both sides of the support plate 12 respectively abuts against the side wall on one longitudinal side of the battery cell 2 in the placement position 1103 on both sides of the support plate 12, and the surrounding edge part 1101 and the support plate 12 both have a communication hole 1202.

[0059] In actual use, the integrated frame 11 and the support plate 12 provide stable support and protection for the battery cell 2. The abutment of the inner wall of the surrounding edge part 1101 with the side wall of the battery cell 2 limits the lateral movement of the battery cell 2, and the abutment of the support parts 1201 on both sides of the support plate 12 with the side wall of the battery cell 2 limits the longitudinal movement of the battery cell 2, thereby ensuring the positional stability of the battery cell 2 during operation. The communication holes 1202 are used to ensure the circulation of cooling medium and heat. The combined structure of the integrated frame 11 and the support plate 12 provides all-around stable support for the battery cell 2, effectively preventing displacement and shaking of the battery cell 2 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 impact is reduced, prolonging the service life of the battery. At the same time, the support parts 1201 in the array ensure sufficient heat dissipation efficiency of the battery cell 2 through small-area abutment with the side wall of the battery cell 2.

[0060] The embodiment also provides a fully immersed battery pack energy storage system, which comprises the fully immersed battery pack described above, the battery shell 1 is a plurality of, further comprising an arrangement frame 8, the arrangement frame 8 has a placing space 801, the battery shell 1 is arranged in the placing space 801, and the placing space 801 has a smoke outlet 802.

[0061] In the embodiment, the plurality of battery shells 1 are arranged in space by the arrangement frame 8, the space utilization is improved, more battery packs can be accommodated in a limited space, and thus the energy storage capacity is increased. A reasonable arrangement mode helps to optimize the connection and management between battery packs, reduces the complexity and failure rate of the system, facilitates centralized monitoring and maintenance of the battery packs, and improves the operation and maintenance efficiency. A flexible arrangement mode can adapt to different installation environments and requirements, and improves the versatility of the energy storage system. The smoke outlet 802 of the placing space 801 can timely discharge smoke when needed.

[0062] Further, the smoke valve 5 is arranged on the smoke outlet 802.

[0063] In this embodiment, when an abnormality occurs inside the energy storage system, such as thermal runaway and other serious situations, the smoke and gas generated can be discharged through the smoke outlet 802. Under normal circumstances, the smoke valve 5 is in a closed state; under abnormal circumstances, the smoke valve 5 is opened. The arrangement of the smoke outlet 802 and the smoke valve 5 can timely discharge the smoke and harmful gas generated abnormally inside the energy storage system, reduce the safety risk. Effectively avoid the accumulation of smoke and harmful gas inside the energy storage system, reduce the damage to the battery cell 2 and other components. Improve the safety of the energy storage system under abnormal conditions, gain time for personnel evacuation and emergency treatment. The smoke valve 5 can remain closed under normal circumstances to prevent foreign matter from entering the placement space 801, ensuring the normal operating environment of the energy storage system. Enhance the safety protection performance of the energy storage system, improve the reliability and stability of the entire system.

[0064] The cold machine 9 is arranged in the placement space 801, and the input end and the output end of the cold machine 9 are both in communication with the containing cavity 101; and the fire extinguishing device 10 is arranged in the placement space 801.

[0065] In this embodiment, specifically, the input end and the output end of the cold machine 9 are both in communication with the refrigerant outlet 103 and the refrigerant inlet 102; when the energy storage system is working, the cold machine 9 operates, the refrigerant flows out from the refrigerant outlet 103 into the cold machine 9 to be cooled, and then flows out from the output end of the cold machine 9 to return to the containing cavity 101 of the battery shell 1 through the refrigerant inlet 102, forming a cooling cycle of the refrigerant. When the energy storage system has a fire hazard or a fire, the fire extinguishing device 10 is started to extinguish the fire. The arrangement of the cold machine 9 can more efficiently cool the refrigerant, further improve the heat dissipation effect of the battery pack, ensure that the energy storage system can still maintain a suitable temperature when running under high load, prolong the battery life and improve the performance. The communication mode with the refrigerant outlet 103 and the refrigerant inlet 102 makes the cooling cycle of the refrigerant more smooth and controllable, which is conducive to accurately adjusting the temperature of the energy storage system. The arrangement of the fire extinguishing device 10 greatly improves the safety of the energy storage system, can respond in time in the early stage of a fire, and reduce the loss. Enhance the ability of the energy storage system to respond to emergencies, and reduce the damage degree of the fire and other accidents to the entire system.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit the present application. Although the present application 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 application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A fully immersed battery pack, characterized by, The battery shell (1) has a containing cavity (101); The battery shell (1) has a containing cavity (101); The cold plate (3) is thin and is arranged in the containing cavity (101); the longitudinally arranged plurality of battery cells (2) form a longitudinal battery group (201), the longitudinal battery group (201) is arranged in groups in the transverse direction, the cold plate (3) is arranged vertically, and the cold plate (3) is arranged between every two adjacent groups of longitudinal battery groups (201); The cooling medium (4) is uniformly distributed in the containing cavity (101); The bottom frame (6) is arranged on the bottom wall of the containing cavity (101), and the 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 containing cavity (101); The spacing frame (7) is arranged between the longitudinally arranged adjacent two battery cells (2), and the spacing frame (7) has a second isolation gap (701); The integral frame (11) has a surrounding edge portion (1101), 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 wall around the battery cell (2) abuts against the inner wall of the surrounding edge portion (1101); The support plate (12) is arranged in the placement space (1102), and the support plate (12) longitudinally divides the placement space (1102) into two placement positions (1103); the battery cell (2) is partially arranged in the placement position (1103); the support plate (12) has a support portion (1201) on both sides; the support portion (1201) is arranged on the support plate (12) in an array; the support portion (1201) on both sides of the support plate (12) abuts against the side wall on the longitudinal side of the battery cell (2) in the placement position (1103) on both sides of the support plate (12); and the surrounding edge portion (1101) and the support plate (12) each have a communication hole (1202). The cold plate (3) has a refrigerant cavity (301), and the refrigerant cavity (301) flows with refrigerant.

2. A fully immersed battery pack according to claim 1, wherein, The cooling medium (4) is a gas or a liquid.

3. A fully immersed battery pack according to claim 2, wherein, The containing cavity (101) has a refrigerant outlet (103) and a refrigerant inlet (102); the refrigerant inlet (102) and the refrigerant outlet (103) are in communication with the refrigerant cavity (301); and the refrigerant is circulated and delivered between the refrigerant outlet (103), the refrigerant cavity (301) and the refrigerant inlet (102).

4. A fully immersed battery pack according to claim 2, wherein, The battery shell (1) is a plurality of 5. A fully-submerged battery energy storage system comprising a fully-submerged battery of any one of claims 1-4, wherein, ​ Arrangement frame (8), the arrangement frame (8) has a placement space (801), the battery shell (1) is spatially arranged in the placement space (801), the placement space (801) has a smoke outlet (802).

6. A fully-submerged battery energy storage system according to claim 5, wherein, Further comprising: A smoke valve (5) is arranged on the smoke outlet (802).

7. A fully-submerged battery energy storage system according to claim 5, wherein, Further comprising: A cold machine (9) is arranged in the placement space (801), and the input end and the output end of the cold machine (9) are communicated with the containing cavity (101); A fire-fighting device (10) is arranged in the placement space (801).

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