Fully-immersed liquid-cooled battery module

Abstract

A fully-immersed liquid-cooled battery module belongs to the technical field of energy storage batteries and comprises a box body and an upper cover, insulating liquid, a battery module, a battery connecting system, a battery management system and an auxiliary supporting component are arranged in the box body, the battery module, the battery connecting system and the battery management system are fully immersed in the insulating liquid, a liquid-cooled plate is arranged below the battery module, and the liquid-cooled plate is arranged below the upper cover. The box body is formed by fixedly connecting reinforcing side plates which are oppositely arranged left and right, panels which are oppositely arranged front and back and a liquid cooling plate at the bottom, the liquid cooling plate, the panels and the reinforcing side plates are all of hollow profile structures, lifting holes are formed in the reinforcing side plates, and the liquid cooling plate, the panels and the reinforcing side plates are all of hollow profile structures, so that the overall strength of the box body is effectively improved; the overall stability of the battery module can be guaranteed, the influence on the heat dissipation efficiency can be reduced, and meanwhile, the overall hoisting of the battery module is also facilitated due to the arrangement of the hoisting holes.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, and in particular to a fully immersed liquid-cooled battery module. Background Technology

[0002] Electrochemical energy storage is characterized by high energy density, fast response speed, and environmental friendliness. Batteries are the core of electrochemical energy storage, and their operating state and lifespan are closely related to temperature. If a single cell is exposed to excessively high, low, or highly fluctuating temperatures for an extended period, it can easily lead to capacity mismatch between the battery module and battery cluster, resulting in thermal runaway in cases of severe overheating. Conversely, excessively low temperatures can cause battery capacity degradation and decreased charge / discharge performance, affecting the overall energy storage level of the entire system.

[0003] Currently, in addition to indirect cooling methods such as air cooling and plate heat exchanger liquid cooling, direct cooling methods have also emerged for battery module cooling. Specifically, coolant is filled into the battery box, and a liquid cooling plate is installed at the bottom of the box. The battery module is immersed in the coolant and placed on the liquid cooling plate. Heat exchange is achieved through contact between the coolant and various surfaces of the battery module, improving heat exchange efficiency and uniformity.

[0004] Existing direct-cooling battery module structures typically have enclosures welded from sheet metal, resulting in low overall stability. When used in large battery modules such as energy storage cabinets and battery compartments, these modules require hoisting and transportation for disassembly and assembly, which can easily damage the enclosure and lead to coolant leakage. Increasing the sheet metal thickness would further increase the enclosure's wall thickness, severely impacting heat dissipation efficiency. Utility Model Content

[0005] To address the technical problem in the background art that existing direct cooling battery module structures have poor stability and are easily damaged during hoisting and transportation when applied to large battery modules, this utility model provides a fully immersed liquid-cooled battery module.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a fully submerged liquid-cooled battery module, including a housing and a top cover. The housing contains insulating liquid, battery modules, a battery connection system, a battery management system, and auxiliary support components. The battery modules, battery connection system, and battery management system are completely submerged in the insulating liquid. A liquid cooling plate is located below the battery modules. The housing is fixedly connected by left and right opposite reinforcing side plates, front and back opposite front and rear panels, and a bottom liquid cooling plate. The liquid cooling plate, front and rear panels, and reinforcing side plates are all perforated profile structures. The reinforcing side plates have lifting holes. The perforated profile structure of the liquid cooling plate, front and rear panels, and reinforcing side plates effectively improves the overall strength of the housing, ensuring the overall stability of the battery module and reducing the impact on heat dissipation efficiency. At the same time, the lifting holes facilitate the overall lifting and transportation of the battery module.

[0008] Preferably, a sealing strip is provided between the top cover and the box body, which facilitates the connection between the top cover and the box body. The sealing strip ensures the airtightness of the connection between the box body and the top cover, and prevents leakage of insulating fluid.

[0009] Preferably, the liquid cooling plate is fixedly installed at the bottom of the housing. The liquid cooling plate is only installed at the bottom of the housing, which makes the structure more compact, occupies less space, and reduces the complexity and failure rate of the cooling system. The liquid cooling plate adopts a harmonica tube-type flow channel, which ensures heat exchange efficiency while reducing the flow resistance of the coolant.

[0010] Preferably, insulating sheets are attached to the liquid cooling plate at intervals. The insulating sheets are located between the battery module and the liquid cooling plate and are used for insulation between the battery cell and the liquid cooling plate.

[0011] Preferably, a cell fixing base is fixedly installed on the bottom liquid cooling plate of the box, and the battery module is fixedly installed on the cell fixing base. The cell fixing base is higher than the liquid cooling plate, which can restrict the degree of freedom of the battery module and ensure that it does not shift during transportation.

[0012] Preferably, each cell in the battery module is provided with a buffer unit, which includes aerogel and sealing strips, and plays a role in shock absorption and heat insulation.

[0013] Preferably, the insulating liquid is a single medium. A single-medium insulating liquid is relatively uniform in physical and chemical properties, which can provide stable insulation performance and reduce the complexity of operation and maintenance.

[0014] Preferably, the panel of the housing is provided with a coolant inlet, a negative connector, a manual maintenance switch, a positive connector, a first communication interface, a heating interface, a second communication interface, and a coolant outlet. The negative connector, manual maintenance switch, and positive connector serve to connect the battery module and provide isolation protection. The first and second communication interfaces are used to connect to monitoring equipment to monitor the status information of the battery cells and the temperature of the insulating fluid. The heating interface is used to heat the insulating fluid to ensure the working stability of the battery module in low-temperature environments. The coolant inlet and coolant outlet are connected to the inlet and outlet of the liquid cooling plate, respectively, to realize the circulation of coolant.

[0015] Preferably, the side of the top cover is provided with an oil observation port, through which the liquid level and state of the insulating liquid inside the box can be observed and checked. The top of the top cover is provided with an oil filling port and a pressure relief valve. The pressure relief valve is used to eliminate pressure fluctuations inside the box. The oil filling port and the pressure relief valve are positioned opposite each other at both ends of the top of the top cover. The opposite arrangement of the two can reduce mutual interference between them and prevent the pressure generated during the filling of insulating liquid from directly acting on the pressure relief valve, which could lead to malfunction or damage to the pressure relief valve, thus improving reliability.

[0016] As can be seen from the above technical solutions, the advantages of this utility model are:

[0017] 1. Direct cooling is adopted to achieve direct heat dissipation of the battery module, which improves heat exchange efficiency. The left and right side walls of the battery module housing are reinforced side plates, the front and rear sides are panels, and the bottom is a liquid cooling plate. The liquid cooling plate, panels, and reinforced side plates are all hollow profile structures, which can ensure the overall stability of the battery module and reduce the impact on heat dissipation efficiency. At the same time, the setting of lifting holes facilitates the overall lifting and transportation of the battery module, which is suitable for the application of large battery modules.

[0018] 2. The liquid cooling plate is fixedly installed at the bottom of the box. The liquid cooling plate is only installed at the bottom of the box, which makes the structure more compact, occupies less space, and reduces the complexity and failure rate of the cooling system. The liquid cooling plate adopts a harmonica tube-type flow channel, which ensures heat exchange efficiency while reducing the flow resistance of the coolant.

[0019] 3. A cell fixing base is fixedly installed on the bottom liquid cooling plate of the box. The battery module is fixedly installed on the cell fixing base. The cell fixing base is higher than the liquid cooling plate, which can restrict the freedom of the battery module and ensure that it does not shift during transportation.

[0020] 4. Each cell in the battery module is equipped with a buffer unit, which includes aerogel and sealing strips, and serves to prevent shock and insulate heat. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the fully immersed liquid-cooled battery module according to one or more embodiments of the present invention.

[0023] Figure 2 This is a structural schematic diagram of the box body according to one or more embodiments of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the box according to one or more embodiments of the present invention. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the internal structure of the box according to one or more embodiments of the present invention. Figure 2 ;

[0026] Figure 5 This is a cross-sectional structural diagram of the liquid cooling plate at the bottom of the box according to one or more embodiments of the present invention.

[0027] The components represented by the various reference numerals in the diagram are:

[0028] 1. Coolant inlet; 2. Negative connector; 3. Housing; 4. Manual maintenance switch; 5. Reinforced side plate; 6. Positive connector; 7. Oil sight glass; 8. Top cover; 9. Oil filler port; 10. Pressure relief valve; 11. First communication interface; 12. Heating interface; 13. Second communication interface; 14. Coolant outlet; 15. Receiving cavity; 16. Cell mounting base; 17. Insulating sheet; 18. Liquid cooling plate; 19. Battery module; 20. Buffer unit; 21. Battery connection system; 22. Battery management system. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0030] In a typical embodiment of this utility model, such as Figures 1-5As shown, a fully immersed liquid-cooled battery module is proposed, including: a housing 3, a top cover 8, a battery module 19, a battery connection system 21, and a battery management system 22. The housing 3 has a receiving cavity 15, and a liquid cooling plate 18 is located at the bottom of the receiving cavity 15. The liquid cooling plate 18 is fixedly installed at the bottom of the housing 3. An insulating liquid is contained within the receiving cavity 15. The battery module 19 is fixedly installed within the receiving cavity 15 and completely immersed in the insulating liquid. Through the cooperation of the insulating liquid and the liquid cooling plate 18, synchronous and uniform heat dissipation is achieved on all surfaces of the battery module 19, improving heat dissipation efficiency and effect. The left side of the housing 3... The right side walls are reinforced side plates 5, and the front and rear sides of the housing 3 are panels. The panels, reinforced side plates 5, and liquid cooling plates 18 are welded and fixed together to form the housing 3. The liquid cooling plates 18, panels, and reinforced side plates 5 are all hollow profile structures, specifically hollow stamped aluminum profile structures. The outer surface of the panel is a flat structure to facilitate the installation of other components. The hollow design of the liquid cooling plates 18, panels, and reinforced side plates 5 can ensure the overall stability of the battery module and reduce the impact on heat dissipation efficiency. In order to facilitate the overall lifting of the battery module, lifting holes are provided on the reinforced side plates 5.

[0031] The fully submerged liquid-cooled battery module is equipped with two cooling media. The first is located inside the housing cavity 15, where the insulating coolant is stationary and does not flow. The battery module 19 is completely submerged in the insulating coolant for heat conduction and insulation. The heat generated by the battery charging and discharging is absorbed by the insulating coolant in the housing cavity 15. A liquid cooling plate 18 is provided at the bottom of the housing cavity 15, and a second cooling medium flows inside the liquid cooling plate 18. The heat from the first cooling medium in the housing cavity 15 is removed through the heat exchange effect of the liquid cooling plate 18 at the bottom. Since the coolant in the liquid cooling plate 18 flows uniformly, the temperature uniformity of the battery can be better guaranteed.

[0032] like Figure 1 and Figure 2 As shown, the panel of the housing 3 is equipped with a coolant inlet 1, a negative connector 2, a manual maintenance switch 4, a positive connector 6, a first communication interface 11, a heating interface 12, a second communication interface 13, and a coolant outlet 14. The negative connector 2, the manual maintenance switch 4, and the positive connector 6 serve to connect the battery module 19 and provide isolation protection. The first communication interface 11 and the second communication interface 13 are used to connect monitoring equipment to monitor the status information of the battery cells and the temperature of the insulating fluid. The heating interface 12 is used to heat the insulating fluid to ensure the working stability of the battery module in low-temperature environments. The coolant inlet 1 and the coolant outlet 14 are connected to the inlet and outlet of the liquid cooling plate 18, respectively, to realize the circulation of coolant.

[0033] The top cover 8 is fixedly installed at the upper opening of the box 3 by bolts, and a sealing strip is provided between the top cover 8 and the box 3. The top cover 8 and the box 3 work together to form a sealed box structure. The side of the top cover 8 is provided with an oil observation port 7 to observe and check the liquid level and status of the insulating liquid inside the box 3. The top of the top cover 8 is provided with an oil filling port 9 and a pressure relief valve 10. The oil filling port 9 and the pressure relief valve 10 are arranged opposite each other at the two ends of the top of the top cover 8. The oil filling port 9 is used for adding insulating liquid, and the pressure relief valve 10 is used to eliminate pressure fluctuations inside the box 3.

[0034] In this embodiment, the insulating liquid is a single insulating and cooling medium such as fluorinated liquid. The insulating liquid can act as a fire extinguishing agent to prevent the spread of fire, and can also protect the battery cells from environmental factors such as humidity, dust and vibration, ensuring the safe and stable operation of the energy storage system under various complex operating conditions.

[0035] It is important to note that when selecting the type of insulating fluid, the composition of each type of insulating fluid and its compatibility with the battery module, as well as the physical and chemical properties and service life of different insulating fluids, must be considered.

[0036] like Figure 2 As shown, the bottom of the housing 3 is a liquid cooling plate 18, as... Figure 5 As shown, the liquid cooling plate 18 adopts a harmonica tube-type flow channel, that is, a structure of several long strips of flow channels arranged side by side, which ensures heat exchange efficiency while reducing the flow resistance of the coolant. Insulating sheets 17 are attached to the liquid cooling plate 18 at intervals for insulation between the battery cell and the liquid cooling plate 18.

[0037] In this embodiment, a liquid cooling plate 18 is only installed at the bottom of the housing 3, which makes the structure more compact, occupies less space, reduces the complexity and failure rate of the cooling system, and the single-medium insulating liquid is relatively uniform in physical and chemical properties, which can provide stable insulation performance and reduce the complexity of operation and maintenance.

[0038] A cell mounting base 16 is fixedly mounted on the bottom liquid cooling plate 18 of the housing 3. The cell mounting base 16 has several threaded holes. The battery module 19 is fixedly mounted on the cell mounting base 16 by bolts. The height of the cell mounting base 16 is higher than that of the liquid cooling plate 18, which restricts the freedom of movement of the battery module 19 and ensures that it does not shift during transportation. Figure 3 As shown, each cell in the battery module 19 is provided with a buffer unit 20. The buffer unit 20 includes aerogel and sealing strip, which serve to prevent shock and insulate heat.

[0039] like Figure 4As shown, in this embodiment, the housing 3 is also equipped with a battery connection system 21, namely CCS (Cells Contact System), a battery management system 22, namely BMU (Battery Management Unit), and other auxiliary support components. The battery management system 22, the battery connection system 21, and other auxiliary support components are all immersed in insulating liquid. The battery management system 22, the battery connection system 21, and other auxiliary support components are all conventional structures. The battery management system 22 is fixed to the inner wall of the front panel of the housing 3. The specifics will not be elaborated here.

[0040] By employing direct cooling, the battery module 19, battery management system 22, battery connection system 21, and other auxiliary support components are completely immersed in a non-toxic, heat-dissipating insulating liquid. This achieves direct heat dissipation of the battery module, resulting in higher heat exchange efficiency and preventing further spread of thermal runaway. Simultaneously, the bottom liquid cooling plate 18 ensures temperature uniformity, avoids localized overheating, reduces temperature differences between cells and clusters, and ensures the battery maintains a suitable operating temperature during high-efficiency operation, extending battery life. Furthermore, the liquid cooling plate 18 at the bottom of the housing 3 provides forced external heat exchange to the insulating liquid, keeping the battery module 19 within its optimal temperature range. This solves the problems of low cooling efficiency and poor temperature uniformity associated with indirect cooling methods. Additionally, the insulating liquid has fire-extinguishing capabilities, fundamentally reducing the risk of cell thermal runaway and significantly improving safety.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully immersed liquid-cooled battery module, comprising: The box (3) and the upper cover (8) are characterized in that the box (3) is provided with insulating liquid, a battery module (19), a battery connection system (21), a battery management system (22) and an auxiliary support component, the battery module (19), the battery connection system (21) and the battery management system (22) are completely immersed in the insulating liquid, the lower part of the battery module (19) is provided with a liquid cooling plate (18), the box (3) is fixedly connected by left and right oppositely arranged reinforcing side plates (5), front and rear oppositely arranged panels and the bottom liquid cooling plate (18), the liquid cooling plate (18), the panel and the reinforcing side plate (5) are all hollow profile structures, and the reinforcing side plate (5) is provided with a lifting hole.

2. The fully-immersed liquid-cooled battery module of claim 1, wherein, A sealing strip is arranged between the upper cover (8) and the box (3).

3. The fully-immersed liquid-cooled battery module of claim 1, wherein, The liquid cooling plate (18) is fixedly arranged at the bottom of the box (3), and the liquid cooling plate (18) adopts a harmonica tube type flow channel.

4. The fully-immersed liquid-cooled battery module of claim 1, wherein, An insulating sheet (17) is fixedly arranged on the liquid cooling plate (18) in a spaced manner, and the insulating sheet (17) is arranged between the liquid cooling plate (18) and the battery module (19).

5. The fully-immersed liquid-cooled battery module of claim 1, wherein, An electric core fixing base (16) is fixedly arranged on the liquid cooling plate (18) at the bottom of the box (3), the battery module (19) is fixedly arranged on the electric core fixing base (16), and the electric core fixing base (16) is higher than the liquid cooling plate (18).

6. The fully-immersed liquid-cooled battery module of claim 1, wherein, A buffer unit (20) is arranged between each electric core in the battery module (19), and the buffer unit (20) comprises aerogel and a sealing rubber strip.

7. The fully-immersed liquid-cooled battery module of claim 1, wherein, The insulating liquid is a single medium.

8. The fully-immersed liquid-cooled battery module of claim 1, wherein, The panel of the box (3) is provided with a cooling liquid inlet (1), a negative electrode connector (2), a manual maintenance switch (4), a positive electrode connector (6), a first communication interface (11), a heating interface (12), a second communication interface (13) and a cooling liquid outlet (14).

9. The fully-immersed liquid-cooled battery module of claim 1, wherein, An oil observation port (7) is arranged at the side of the upper cover (8), an oil filling port (9) and a pressure relief valve (10) are arranged at the top of the upper cover (8), and the oil filling port (9) and the pressure relief valve (10) are oppositely arranged at two ends of the top of the upper cover (8).

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