Stacked immersion cooling energy storage battery pack

Abstract

The invention discloses a stacked immersion cooling energy storage battery pack, relates to the field of energy storage battery packs, and aims to solve the problem that a static immersion cooling technology has obvious insufficiency in the aspects of high-efficiency export of heat in the middle of a battery cell and emergency treatment of temperature abnormities, the stacked immersion cooling energy storage battery pack comprises an outer shell and a sealing cover, and a sealing partition plate is fixedly connected in the outer shell; an immersion cavity is arranged above the sealing partition plate, a bottom limiting frame is fixedly connected in the immersion cavity, a battery cell group is clamped on the bottom limiting frame, a cooling partition assembly is arranged at a gap of the battery cell group, a standby liquid storage cavity is arranged below the sealing partition plate, and a liquid exchange pipe group is arranged between the standby liquid storage cavity and the immersion cavity. The battery pack has the advantages that through the cooling separation assembly and the standby liquid storage cavity, heat in the middle area of the battery cell is effectively guided out, the temperature distribution uniformity in the battery pack is improved, an emergency cooling mechanism is provided when the temperature is abnormal, and the safety and cycle life of a battery system are improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery pack technology, and in particular to a stacked immersion-cooled energy storage battery pack. Background Technology

[0002] With the rapid development of the new energy industry, the scale and energy density of electrochemical energy storage systems are constantly increasing, making thermal management issues increasingly prominent. Effective heat dissipation is a key factor in ensuring the safety, lifespan, and performance of battery systems. Immersion cooling technology, with its excellent heat dissipation capacity and insulation properties, has become an important solution for the thermal management of large-capacity energy storage batteries. Currently, immersion cooling technology in the energy storage field mainly adopts two technical routes: The first route uses a pump to drive the insulating immersion liquid to circulate inside the battery pack, allowing the liquid to directly contact the cells and transfer heat to an external liquid cooler for dissipation. Although this method has high heat dissipation efficiency, it relies on a complex pump system, and prolonged continuous operation can easily lead to pump failure and immersion liquid leakage, increasing the difficulty of system maintenance and safety risks. The second technical route completely immerses the battery in a static insulating immersion liquid and sets up fixed cooling pipes inside the liquid, with cooling medium flowing through the pipes, indirectly dissipating heat through the pipe walls. This method has a simple structure, high reliability, and avoids the potential problems of pump systems.

[0003] However, the second static immersion method has a significant technical bottleneck: severely uneven temperature distribution within the battery pack. During charging and discharging, the heat-generating areas exhibit non-uniform characteristics. In ternary lithium-ion cells, heat is concentrated in the central region of the cell, while in some lithium iron phosphate batteries, the heat-generating points are often limited to specific areas within the individual cell. In a static immersion environment, heat transfer relies primarily on natural convection and limited thermal conduction mechanisms, making it difficult to efficiently transfer heat from the core heat-generating areas to fixed-location cooling pipes. Since cooling pipes are typically located on the sidewalls or bottom of the battery pack, far from the center of the cells, the heat transfer path is long and inefficient, easily leading to localized hot spots within the battery pack. This temperature unevenness not only disrupts the consistency between individual battery cells, accelerates battery aging, and shortens overall cycle life, but may also trigger safety hazards such as thermal runaway.

[0004] In existing technologies, such as the stacked high-heat-dissipation immersion-cooled energy storage battery pack disclosed in patent application number "CN202410908281.4", the cooling pipes are only located above the cells, and the cells are physically separated only by ordinary partitions. This design cannot effectively intervene in the heat conduction process in the middle of the cells, leading to heat accumulation in the core heat-generating area and causing localized overheating. Furthermore, this solution relies solely on a single cooling pipe for heat dissipation, resulting in a slow heat conduction response and a lack of a rapid cooling emergency mechanism when the internal temperature of the battery fluctuates abnormally, making it difficult to ensure the safe and stable operation of the battery pack under extreme conditions. These shortcomings indicate that existing static immersion cooling technology is significantly inadequate in solving the problems of efficient heat dissipation from the middle of the cells and emergency handling of abnormal temperatures. Summary of the Invention

[0005] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a stacked immersion-cooled energy storage battery pack. This design effectively solves the problem that static immersion cooling technology is significantly insufficient in terms of efficient heat dissipation from the middle of the battery cell and emergency handling of abnormal temperatures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes an outer shell and a sealing cover. A sealing partition is fixedly connected inside the outer shell. An immersion chamber is provided above the sealing partition. A bottom limiting frame is fixedly connected inside the immersion chamber. A battery cell assembly is snapped onto the bottom limiting frame. A cooling separation component is provided at the gap of the battery cell assembly. The cooling separation component is snapped onto the bottom limiting frame. A spare liquid storage chamber is provided below the sealing partition. A liquid replacement pipe assembly is installed between the spare liquid storage chamber and the immersion chamber. The cooling partition assembly includes a cooling partition with a flow channel inside. The flow channel is connected to an inlet pipe and an outlet pipe, both of which are fixedly connected to the outer casing.

[0007] Preferably, the cooling separation assembly further includes an inlet ring pipe and an outlet ring pipe, the outlet ring pipe being located above the inlet ring pipe, the outlet ring pipe being fixedly connected to the outlet pipe, the inlet ring pipe being fixedly connected to the inlet pipe, and both the outlet ring pipe and the inlet ring pipe being connected to the flow guide channel.

[0008] Preferably, a heat dissipation gap is provided between the battery cell assembly and the inner wall of the outer casing, and both the liquid inlet ring pipe and the liquid outlet ring pipe are located within the heat dissipation gap.

[0009] Preferably, the bottom limiting frame is provided with a storage slot, the cooling baffle is located in the storage slot, and a top limiting frame is provided above the cooling baffle, the top limiting frame being fixedly connected to the sealing cover.

[0010] Preferably, a ventilation slot is provided above the top limiting frame, and guide pipes are fixedly connected to both sides of the top support, with the guide pipes communicating with the ventilation slot.

[0011] Preferably, the spare liquid storage chamber is equipped with a cooling pipe, and the liquid exchange pipe assembly includes an inlet return pipe and an outlet return pipe.

[0012] Preferably, the refrigeration pipes are arranged in an S-shape, and a flow divider is provided in the spare liquid storage chamber, the flow divider being fixedly connected to the outer shell.

[0013] Preferably, the outer casing has a heat dissipation groove on its side, a slot at the bottom of the outer casing, and a protrusion at the top of the sealing cover that mates with the slot.

[0014] Preferably, the spare liquid storage chamber is provided with an expansion bladder for compensating for changes in the volume of the insulating immersion liquid.

[0015] Compared with the prior art, the outstanding advantages of this invention are: The application proposes to achieve targeted heat conduction by directly placing the cooling separation component at the gap between the cells, and to provide emergency cooling by working in conjunction with the backup liquid storage chamber and the liquid exchange pipe group. This effectively removes heat from the central area of ​​the cells, improves the uniformity of temperature distribution inside the battery pack, and provides an emergency cooling mechanism in case of abnormal temperature, thereby improving the safety and cycle life of the battery system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the outer shell of the present invention.

[0019] Figure 4 This is a schematic diagram of the connection structure of the cooling separation component of the present invention.

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the cooling baffle of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure above the sealing partition of the present invention.

[0022] Figure 7 This is a schematic cross-sectional view of the outer shell and sealing partition of the present invention.

[0023] Figure 8 This is a schematic diagram of the internal structure of the backup liquid storage chamber of the present invention.

[0024] Figure 9 For the present invention Figure 6 A magnified structural diagram of A in the diagram.

[0025] The following are the labeling elements in the diagram: 1. Outer shell; 2. Sealing cover; 3. Sealing partition; 4. Immersion chamber; 5. Bottom limiting frame; 6. Battery cell assembly; 7. Cooling partition assembly; 701. Cooling partition; 702. Flow guide channel; 703. Liquid inlet pipe; 704. Liquid outlet pipe; 705. Liquid inlet ring pipe; 706. Liquid outlet ring pipe; 8. Spare liquid storage chamber; 9. Storage slot; 10. Top limiting frame; 11. Ventilation slot; 12. Flow guide pipe; 13. Cooling pipe; 14. Liquid inlet return pipe; 15. Liquid outlet return pipe; 16. Diverting guide plate; 17. Heat dissipation slot; 18. Slot; 19. Protrusion. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Please see the appendix Figure 1-9This embodiment discloses a stacked immersion-cooled energy storage battery pack, comprising an outer shell 1 and a sealing cover 2. A sealing partition 3 is fixedly connected inside the outer shell 1. An immersion chamber 4 is provided above the sealing partition 3. A bottom limiting frame 5 is fixedly connected inside the immersion chamber 4. A cell assembly 6 is snapped onto the bottom limiting frame 5. A cooling separation component 7 is provided at the gap between the cell assemblies 6 and is snapped onto the bottom limiting frame 5. A spare liquid storage chamber 8 is provided below the sealing partition 3. A liquid exchange device is installed between the spare liquid storage chamber 8 and the immersion chamber 4. The cooling partition assembly 7 includes a cooling partition 701, which is snapped into the storage slot 9. The cooling partition 701 has a flow channel 702 connected to an inlet pipe 703 and an outlet pipe 704, both of which are fixedly connected to the outer casing 1. The cooling partition assembly 7 is a structure used to achieve heat conduction and dispersion in the gaps between the battery cells 6. Its main function is to intercept heat by directly contacting the surface of the battery cells through the cooling partition 701. Specifically, the cooling partition 701 can be made of a metal material such as aluminum or copper, or it can be made of a composite material with high thermal conductivity. Furthermore, the shape of the cooling partition 701 can be adjusted according to the actual layout of the battery cell assembly 6, for example, designed as a flat plate, a wave-like shape, or other geometric shapes adapted to the gaps between the battery cells, thereby ensuring a tight fit with the surface of the battery cells. Furthermore, the overall structure of the flow channel 702 matches the shape of the cooling baffle 701, allowing it to hold more coolant and improve heat exchange efficiency. The function of the backup liquid storage chamber 8 is to store additional insulating immersion fluid and to replenish or replace the fluid through the fluid exchange pipe assembly in case of abnormal temperature. Specifically, the backup liquid storage chamber 8 can monitor liquid level changes by setting a float valve or pressure sensor, thereby triggering liquid flow. Further, the fluid exchange pipe assembly can use a solenoid valve or a manual valve to control the liquid flow direction, thereby achieving rapid replenishment of the liquid in the immersion chamber 4.

[0028] The innovation of this application lies in integrating a cooling partition component 7 into the gaps between the battery cells (6) and combining it with a backup liquid storage chamber 8. This solves the problems of uneven temperature distribution and localized overheating within the battery cells in static immersion cooling solutions. Specifically, the cooling partition component 7 can directly contact the core heat-generating area of ​​the battery cell, significantly improving heat transfer efficiency, while the backup liquid storage chamber 8 provides an emergency heat dissipation plan, effectively mitigating the risk of sudden temperature rise. Thus, this technical solution optimizes the thermal management path and avoids the heat transfer bottleneck problem caused by the fixed position of cooling components in traditional static immersion cooling.

[0029] Its working principle is as follows: The outer shell 1 and the sealing cover 2 together construct a sealed environment to prevent leakage of the insulating impregnation fluid, providing a basic guarantee for the safe operation of the system. The sealing partition 3 divides the internal space into upper and lower independent areas, distinguishing the functions of the immersion chamber 4 and the backup liquid storage chamber 8, facilitating directional liquid flow in case of abnormal temperatures. The immersion chamber 4 serves as the working space for the cell assembly 6, containing the insulating impregnation fluid for initial heat dissipation. Furthermore, the bottom limiting bracket 5 not only fixes the position of the cell assembly 6 but also provides a base for the cooling separation assembly 7, strengthening the physical contact between the cooling structure and the cell.

[0030] The cooling baffle 701 in the cooling partition assembly 7 can be precisely snapped into the storage slot 9, closely fitting the surface of the battery cell, especially the core heat-generating area such as the middle of the battery cell, to avoid hot spot accumulation caused by insufficient natural convection. The flow channel 702 inside the cooling baffle 701 connects the inlet pipe 703 and the outlet pipe 704 according to the heat distribution characteristics of the battery cell, allowing the coolant to circulate directionally within the channel, realizing real-time heat exchange in the heat-generating area and significantly improving heat transfer efficiency. The fixed connection between the inlet pipe 703 and the outlet pipe 704 and the outer casing 1 ensures stable access to the external cooling system and maintains the reliability of coolant flow.

[0031] The backup liquid storage chamber 8 is used to store additional insulating impregnation fluid. When the temperature of the impregnation chamber 4 is abnormal, the liquid replenishment or replacement is triggered by the liquid exchange pipe group according to the temperature change, forming a rapid response emergency heat dissipation plan to effectively mitigate the risk of sudden temperature rise.

[0032] The cooling separation assembly 7 also includes an inlet ring pipe 705 and an outlet ring pipe 706. The inlet ring pipe 705 is a ring-shaped pipe structure arranged around the cell assembly 6, which can be made of metal or corrosion-resistant plastic tubing, and its purpose is to provide a uniformly distributed inlet point for the coolant. The outlet ring pipe 706 is a ring-shaped discharge pipe that cooperates with the inlet ring pipe 705. It can be made of the same material and its main function is to collect the coolant after heat exchange and guide it out of the system. The flow channel 702 refers to the fluid passage that runs through the interior of the cooling baffle 701. It can be pre-set during the molding of the cooling baffle 701 or formed during subsequent processing. Its purpose is to ensure smooth flow of coolant throughout the entire cooling partition assembly 7. The inlet ring pipe 705 and outlet ring pipe 706 are located in the gap between the cell assembly 6 and the outer casing 1. The inlet ring pipe 705 and outlet ring pipe 706 can surround the outer perimeter of the cell assembly 6, avoiding the dead zones caused by traditional direct-connection pipes. The outlet ring pipe 706, positioned above the inlet ring pipe 705, fully utilizes the physical property of the hot liquid naturally rising due to its decreasing density, promoting the convection circulation of the coolant. When the coolant flows in from the inlet ring pipe 705, it can fully cover all gap areas of the cell assembly 6, especially forming effective heat exchange in the central heating area of ​​the cell. Subsequently, the coolant, having absorbed heat, is discharged through the outlet ring pipe 706, ensuring the overall system's heat dissipation efficiency. In addition, by fixing the liquid outlet ring pipe 706 to the liquid outlet pipe 704 and the liquid inlet ring pipe 705 to the liquid inlet pipe 703, and making both of them connected to the flow guide channel 702, a complete cooling circuit is constructed, which effectively solves the problem of uneven heat dissipation at the gap between the cells, thereby improving the overall safety and service life of the battery pack.

[0033] The heat dissipation gap refers to the space reserved between the cell assembly 6 and the inner wall of the outer casing 1. Its purpose is to reduce thermal resistance in the heat conduction path and provide a directional flow channel for the cooling medium. In practical applications, this gap can be achieved by adjusting the assembly tolerance between the cell assembly 6 and the outer casing 1, or by setting a positioning structure on the inner wall of the outer casing 1 to precisely control the gap size. The inlet ring pipe 705 and the outlet ring pipe 706 are key components for transporting coolant. They can be made of metal tubing or high-temperature resistant plastic tubing and are fixed in the heat dissipation gap by brackets or snap-fit ​​structures. Their purpose is to ensure that the coolant can directly contact and efficiently absorb heat from the side wall area. The heat dissipation gap effectively solves the problem of heat accumulation in the side wall area of ​​the battery pack. Since thermal resistance easily forms in the side wall area when the cell is working, the design of the heat dissipation gap provides a low-resistance path for heat to diffuse from the periphery of the cell assembly 6 to the outer casing 1.

[0034] The storage slot 9 refers to a recessed structure on the bottom limiting frame 5 for accommodating and positioning the cooling baffle 701. Its dimensions are comparable to those of the cooling baffle 701. The purpose of the storage slot 9 is to restrict the freedom of the cooling baffle 701 through its shape, thereby ensuring the precise positioning of the cooling baffle 701 within the cell gap. The top limiting frame 10 is a mechanical component that applies vertical constraints. It is a rigid pressure block. Its purpose is to exert a downward compressive force on the cooling baffle 701 after the sealing cover 2 is sealed to the outer casing 1, forming a columnar support between the cooling baffle 701 and the top limiting frame 10 inside the casing, thus improving the overall compressive strength of the outer casing 1. The sealing cover 2 provides overall rigid support and can be fixed to the top limiting frame 10 by bolts or welding. Its purpose is to evenly distribute the limiting force to the cooling baffle 701, avoiding localized stress concentration.

[0035] In addition, a ventilation slot 11 is provided above the top limiting frame 10, and guide pipes 12 are fixedly connected to both sides of the top support, with the guide pipes 12 communicating with the ventilation slot 11. Specifically, the ventilation slot 11 refers to a channel structure opened above the top limiting frame 10 for airflow, the purpose of which is to provide an effective hot air exhaust path for the top area of ​​the battery pack. The guide pipe 12 can be understood as a pipe structure that guides the airflow direction, and it can be made of metal tubing material, with the purpose of ensuring that external air can stably flow into the battery pack and communicate with the ventilation slot 11.

[0036] By setting a ventilation slot 11 above the top limiting frame 10, the problem of heat accumulation at the top of the battery pack is effectively solved. Since the top limiting frame 10 directly fixes the upper part of the cell group 6, the area above it is the key area where heat naturally rises and accumulates when the battery is working. The connection design between the guide pipe 12 and the ventilation slot 11 makes full use of the principle of natural convection, allowing external air to enter the ventilation slot 11 efficiently and carry away the accumulated heat, significantly improving the heat dissipation capacity of the top area.

[0037] The backup liquid storage chamber 8 is equipped with a cooling pipe 13. The liquid exchange assembly includes an inlet return pipe 14 and an outlet return pipe 15. Specifically, the cooling pipe 13 is a device used to actively cool the insulating immersion liquid in the backup liquid storage chamber 8. It can be implemented using a metal heat-conducting pipe in conjunction with external refrigeration equipment, such as by circulating a low-temperature refrigerant inside the metal pipe or by directly integrating a semiconductor cooling chip. Its purpose is to quickly absorb heat from the backup liquid, ensuring that the liquid is at a low temperature before being injected into the immersion chamber 4, thereby improving cooling efficiency. The inlet return pipe 14 and the outlet return pipe 15 are pipe structures used to guide the cooled liquid into the immersion chamber 4 and to guide the heated liquid back to the backup liquid storage chamber 8, respectively. They can be implemented using corrosion-resistant and high-temperature resistant flexible pipes, with the aim of constructing a closed loop to support the directional flow and rapid replacement of the liquid. By installing the cooling pipe 13 in the backup liquid storage chamber 8, the cooling function can be quickly activated based on the temperature monitoring signal, directly acting on the stored insulating immersion liquid, avoiding the delay caused by relying on an external circulation system, thereby ensuring that the backup liquid always has a high heat absorption capacity. Meanwhile, the inlet return pipe 14 and outlet return pipe 15 optimize the flow direction based on the changes in liquid density and the laws of thermal convection, enabling the cooled liquid to flow directionally into the immersion chamber 4, while the heated liquid is promptly returned to the backup storage chamber 8 for further cooling. This design not only supports conventional heat exchange but also enables rapid liquid replacement when the internal temperature of the battery pack rises abnormally, effectively suppressing the risk of local overheating.

[0038] The refrigerant pipe 13 is made of metal (such as copper or aluminum) and is formed into an S-shaped layout through bending. The flow guide plate 16 is a plate-like structure with a guiding function. There are three flow guide plates 16, which are sealed and welded to the outer casing 1. The length of each flow guide plate 16 is less than the length of the outer casing 1, and the openings between the three flow guide plates 16 and the outer casing 1 have different orientations (e.g., ...). Figure 8 As shown in the figure, the purpose is to optimize the flow path of the coolant and improve the uniformity of heat dissipation.

[0039] The heat dissipation groove 17 refers to a structure formed on the side of the outer casing 1 to promote heat dissipation. It can be implemented using a strip-shaped groove to increase the contact area between the outer casing 1 and the external environment, thereby improving the efficiency of natural convection and thermal radiation. The slot 18 is a recessed structure on the bottom of the outer casing 1 for positioning and fixing. It can be designed as a rectangular slot according to the geometry of the outer casing 1 to provide a precise assembly reference and enhance connection stability. Specifically, the protrusion 19 refers to a protruding part formed on the upper end of the sealing cover 2 that matches the slot 18. It can be implemented through injection molding, machining, or die casting processes. Its purpose is to form a stable mechanical locking structure through a tight fit with the slot 18, thereby preventing displacement due to vibration or thermal expansion.

[0040] Specifically, the heat dissipation grooves 17 on the side of the outer casing 1 are designed based on the overall structural layout, which can effectively alleviate the problem of uneven temperature distribution caused by internal heat accumulation. The slots 18 at the bottom of the outer casing 1 are customized according to geometry, providing a stable fixing point to ensure that the sealing cover 2 can be accurately aligned and resist external interference during assembly and operation. The protrusion 19 at the upper end of the sealing cover 2 and the slots 18 form a tight mechanical locking structure, maintaining the stability of the sealing interface under temperature fluctuations and long-term use conditions.

[0041] An expansion bladder is a flexible structure with elasticity and compressibility, which can be made of rubber, silicone, or other polymer materials with similar properties. This expansion bladder is directly installed within the backup liquid storage chamber 8, allowing for full contact with the insulating immersion fluid and real-time response to temperature fluctuations. Its purpose is to dynamically regulate the internal pressure balance of the system through its elastic deformation characteristics, thereby avoiding sealing failure or chamber damage caused by thermal expansion and contraction. This not only solves the pressure imbalance problem caused by changes in the volume of the insulating immersion fluid but also further improves the safety and reliability of the entire system, ensuring long-term stable operation of the battery pack under complex temperature environments.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stacked immersion-cooled energy storage battery pack, characterized by: The utility model provides a kind of battery pack, including outer shell (1) and sealing cover (2), the outer shell (1) is fixedly connected with sealing partition (3) inside, the sealing partition (3) top is equipped with immersion cavity (4), the bottom limiting frame (5) is fixedly connected in the immersion cavity (4), the bottom limiting frame (5) is clamped with electric core group (6), the gap of electric core group (6) is equipped with cooling separation component (7), cooling separation component (7) is clamped with the bottom limiting frame (5), the sealing partition (3) below is equipped with spare liquid storage cavity (8), spare liquid storage cavity (8) and immersion cavity (4) between installation liquid exchange pipe group; The cooling separation component (7) includes a cooling partition (701), the cooling partition (701) is provided with a flow guide channel (702), the flow guide channel (702) is communicated with a liquid inlet pipe (703) and a liquid outlet pipe (704), and the liquid inlet pipe (703) and the liquid outlet pipe (704) are fixedly connected with the outer shell (1).

2. The stacked, immersion-cooled, energy storage battery pack of claim 1, wherein: The cooling separation component (7) further includes a liquid inlet ring pipe (705) and a liquid outlet ring pipe (706), the liquid outlet ring pipe (706) is located above the liquid inlet ring pipe (705), the liquid outlet ring pipe (706) is fixedly connected with the liquid outlet pipe (704), the liquid inlet ring pipe (705) is fixedly connected with the liquid inlet pipe (703), and the liquid outlet ring pipe (706) and the liquid inlet ring pipe (705) are communicated with the flow guide channel (702).

3. A stacked immersion-cooled energy storage battery pack according to claim 2, wherein: The electric core group (6) and the inner wall of the outer shell (1) have a heat dissipation gap therebetween, and the liquid inlet ring pipe (705) and the liquid outlet ring pipe (706) are located in the heat dissipation gap.

4. The stacked immersion-cooled energy storage battery pack of claim 1, wherein: The bottom limiting frame (5) is provided with a storage groove (9), the cooling partition (701) is located in the storage groove (9), the cooling partition (701) is provided with a top limiting frame (10) above, and the top limiting frame (10) is fixedly connected with the sealing cover (2).

5. A stacked immersion-cooled energy storage battery pack according to claim 4, wherein: The top limiting frame (10) is provided with a ventilation groove (11) above, and the ventilation groove (11) is communicated with a flow guide pipe (12) fixedly connected on both sides of the top limiting frame.

6. The stacked, immersion-cooled, energy storage battery pack of claim 1, wherein: The spare liquid storage cavity (8) is provided with a refrigeration pipe (13) therein, and the liquid exchange pipe group includes a liquid inlet return pipe (14) and a liquid outlet return pipe (15).

7. The stacked, immersion-cooled, energy storage battery pack of claim 6, wherein: The refrigeration pipe (13) is arranged in an S shape, the spare liquid storage cavity (8) is provided with a flow distribution guide plate (16) therein, and the flow distribution guide plate (16) is fixedly connected with the outer shell (1).

8. The stacked, immersion-cooled, energy storage battery pack of claim 1, wherein: The side edge of the outer shell (1) is provided with a heat dissipation groove (17), the bottom of the outer shell (1) is provided with a clamping groove (18), and the upper end of the sealing cover (2) is provided with a protrusion (19) matched with the clamping groove (18).

9. The stacked, immersion-cooled, energy storage battery pack of claim 1, wherein: The spare liquid storage cavity (8) is provided with an expansion capsule for compensating the volume change of the insulation immersion liquid.

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