A novel submerged battery pack assembly

Abstract

The utility model relates to battery technology field, concretely is a kind of novel immersion battery pack assembly, including box, box inside contains immersion liquid, battery module assembly and direct cooling plate assembly, battery module assembly and direct cooling plate assembly are completely immersed in immersion liquid;Box top is provided with filling opening, drain valve and liquid drain valve, drain valve is used to limit that immersion liquid liquid level does not exceed box upper end surface;Box outside top assembly high pressure connector, low pressure connector and BMS, high pressure connector is electrically connected with battery module assembly, low pressure connector is electrically connected with BMS, battery module assembly respectively.The novel immersion battery pack assembly, greatly improve the safety protection ability of battery cell.Battery module assembly is completely immersed in insulating immersion liquid, when single battery cell appears fire fault, immersion liquid can directly absorb heat, isolate oxygen in the initial stage of fire, cut off the fire from other battery cell spread from the source, completely avoid battery pack overall fire risk, ensure the safe operation of energy storage system.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a novel submersible battery pack assembly. Background Technology

[0002] As the global energy structure shifts towards clean energy, energy storage systems, as core components of electricity storage and dispatch, are increasingly widely used in photovoltaic, wind power, and grid peak shaving. The battery pack, as the energy carrier of the energy storage system, directly determines the reliability of the entire system through its operational stability and safety. According to industry statistics, over 50% of global energy storage system safety incidents stem from cell failures within the battery pack. Furthermore, once a faulty cell catches fire, it can easily spread to adjacent cells through heat conduction and radiation, ultimately causing a fire in the entire battery pack, resulting in severe economic losses and safety hazards.

[0003] Currently, there are two main technical approaches to battery pack safety and heat dissipation solutions in the energy storage field, but both have insurmountable drawbacks: Firstly, a combined solution of "bottom cooling + internal aerosol fire suppression" is adopted. This solution uses a cooling plate at the bottom of the battery pack to dissipate heat from the cells, while an aerosol fire suppression device is installed inside the battery pack to address the risk of fire. However, bottom cooling only transfers heat through indirect contact between the cells and the cooling plate, resulting in low heat exchange efficiency. Especially when the cells are under high-intensity operating conditions such as charging and discharging at over 0.5P, the cell temperature is prone to exceeding the preset target range, accelerating cell aging and increasing the risk of failure. Furthermore, the aerosol fire suppression device can only delay the spread of fire after it has started; it cannot directly act on the initially ignited cells and cannot fundamentally block the spread of the fire source, still posing a risk of the entire battery pack catching fire.

[0004] Secondly, an "external water fire suppression linkage" fire extinguishing scheme is adopted. This scheme connects a water fire suppression system to the outside of the battery pack, and activates the water fire suppression system to carry out a flood-like fire suppression when a fire signal is detected. However, this scheme has obvious limitations: on the one hand, the water fire suppression system has a response delay, and the water flow is difficult to accurately target the initial ignition point inside the battery pack, resulting in poor fire suppression targeting and making it easy for the fire to spread further during the response period; on the other hand, water flowing into the battery pack will damage the internal insulation environment, and even if the fire is successfully extinguished, the battery pack needs to be replaced entirely or extensively repaired, resulting in high after-sales maintenance costs and long cycles.

[0005] In addition, existing battery pack solutions generally face two key technical problems: First, the risk of cooling medium leakage—if the cooling plate or connecting pipes leak, the cooling medium will mix with the insulating components inside the battery pack, damaging the overall insulation withstand voltage performance and inducing a short circuit and fire; Second, the optimization defects of the immersion solution—in some solutions that attempt to use immersion liquid, due to the lack of reasonable design of the filling and discharge structure of the immersion liquid, the problem of immersion liquid overflow is easy to occur, and the compatibility between immersion liquid and cooling medium is not considered. After the cooling medium leaks, the immersion liquid must be replaced immediately, which further increases the maintenance cost and system downtime. Utility Model Content

[0006] The purpose of this invention is to provide a novel submersible battery pack assembly to solve the problem that the bottom cooling method mentioned in the background art can only transfer heat through indirect contact between the battery cell and the cooling plate, resulting in low heat exchange efficiency. In particular, when the battery cell is under high-intensity operating conditions such as charging and discharging at over 0.5P, the battery cell temperature is prone to exceed the preset target range, accelerating battery cell aging and increasing the risk of failure.

[0007] To achieve the above objectives, this utility model provides a novel submersible battery pack assembly, including a housing, the housing containing an immersion liquid, a battery module assembly, and a direct cooling plate assembly, wherein both the battery module assembly and the direct cooling plate assembly are completely submerged in the immersion liquid; The top of the tank is equipped with a filling port, a drain valve, and a discharge valve. The drain valve is used to limit the level of the immersion liquid from not exceeding the upper surface of the tank. The top of the outer side of the enclosure is equipped with a high-voltage connector, a low-voltage connector and a BMS. The high-voltage connector is electrically connected to the battery module assembly, and the low-voltage connector is electrically connected to the BMS and the battery module assembly respectively. The direct cooling plate assembly is provided with a direct cooling plate inlet and a direct cooling plate outlet, which penetrate the wall of the housing and are connected to the external cooling pipe.

[0008] This setup utilizes a core structure consisting of a "box + immersion liquid + battery module assembly + direct cooling plate assembly," completely immersing the battery module and direct cooling plate in the immersion liquid. The liquid's encapsulating properties facilitate heat transfer and fire control. Simultaneously, filling, draining, and releasing components are installed on the top of the box to control the immersion liquid level and prevent overflow. High-voltage and low-voltage connectors and the BMS are mounted on the top outer side of the box, achieving electrical connection while avoiding the risk of contact with the immersion liquid. The direct cooling plate's inlet and outlet penetrate the box wall and connect to external cooling pipes, creating a heat dissipation circulation path.

[0009] Preferably, the enclosure is made of iron plate through welding or stamping processes, and the surface is treated with anti-corrosion and insulation. The sealing structure of the enclosure meets the requirements of no weld defects at the welding points, no cracks at the stamping points, and no leakage at the connection points with other components, ensuring that the immersion liquid does not leak. The direct cooling plate assembly includes an aluminum cooling plate body and a copper connector, and the aluminum cooling plate body and the copper connector are fixed by high-temperature welding.

[0010] This design optimizes the materials and processes for the enclosure and the direct cooling plate assembly. The enclosure is made of welded or stamped iron plate, utilizing the high strength of the iron plate to ensure load-bearing capacity. The welding / stamping process ensures structural integrity, and the surface is treated with anti-corrosion and insulation to prevent rust and leakage. The direct cooling plate is made of aluminum cooling plate body (lightweight and with good thermal conductivity) combined with copper connectors (with excellent electrical conductivity and strong corrosion resistance). The two are firmly connected by high-temperature welding to ensure sealing and thermal conductivity performance. At the same time, the quality of the sealing structure is strictly controlled to prevent leakage of immersion liquid.

[0011] Preferably, the inlet and outlet of the direct cooling plate and the penetration point between them and the housing adopt a groove sealing structure, and the sealing ring of the groove sealing structure is made of fluororubber material.

[0012] This feature employs a grooved sealing structure at the junction of the direct cooling plate inlet / outlet and the housing. The grooves limit the sealing ring, enhancing sealing stability. The sealing ring is made of fluororubber, which has excellent corrosion resistance, high temperature resistance, and sealing performance. It also has good compatibility with immersion liquid, maintaining sealing performance for a long time and preventing the cooling medium from leaking into the housing through the junction.

[0013] Preferably, the battery module assembly includes a battery cell, a wiring harness assembly, an end plate, a steel strip, foam, a copper busbar fixing plastic part, an aluminum busbar, a copper-aluminum busbar connector, and a plastic cover. The battery cell is fixed by the steel strip, the end plate, and the foam. The aluminum busbar is electrically connected to the battery cell terminal through the copper-aluminum busbar connector. The copper busbar fixing plastic part limits the position of the aluminum busbar. The plastic cover covers the top of the battery cell.

[0014] This design incorporates a refined structural design for the battery module assembly. A combination of steel strips, end plates, and foam secures the battery cells from all sides, preventing them from shaking or colliding during operation. Copper-aluminum busbar connectors ensure a reliable electrical connection between the aluminum busbar and the battery cell terminals, guaranteeing stable current transmission. Copper busbar fixing plastic components limit the movement of the aluminum busbar, preventing displacement that could affect the electrical connection. A plastic cover protects the top of the battery cell and integrates the internal structure of the module.

[0015] Preferably, the BMS is used to collect voltage and temperature data of the battery module assembly and control the charging and discharging rate of the battery module assembly to maintain the cell temperature within a preset target range.

[0016] This setting utilizes the monitoring and control functions of the BMS to collect voltage and temperature data of the battery module assembly through the low-voltage connector, and monitor the cell operating status in real time. When an abnormal cell voltage or temperature exceeding the preset range is detected, the BMS issues a command to control the charging and discharging rate of the battery module assembly, adjust the cell operating status, and keep the cell temperature within a suitable range to avoid overcharging, over-discharging, or overheating.

[0017] Preferably, the immersion liquid is insulating and allows the leaked refrigerant to evaporate naturally at room temperature without reducing its own insulation and withstand voltage performance.

[0018] This feature gives the immersion fluid insulating properties, preventing leakage when it comes into contact with battery cells or electrical components. At the same time, by utilizing the physical properties of the immersion fluid, any leaked refrigerant can evaporate naturally at room temperature without mixing with the immersion fluid, thus ensuring that the insulating withstand voltage performance of the immersion fluid is not affected and eliminating the need for frequent replacement of the immersion fluid.

[0019] Preferably, the cold plate body of the direct cooling plate assembly is in direct contact with the immersion liquid, and the immersion liquid is heated or cooled through heat exchange, thereby regulating the cell temperature through heat exchange between the immersion liquid and the cell surface.

[0020] This setup constructs a two-stage heat exchange path: "direct cooling plate - immersion liquid - battery cell". The direct cooling plate body is in direct contact with the immersion liquid, and heat exchange between the direct cooling plate and the immersion liquid is achieved through heat conduction, thereby regulating the temperature of the immersion liquid. The immersion liquid, after temperature change, comes into contact with the surface of the battery cell, and then transfers heat to the battery cell (heating) or absorbs heat from the battery cell (cooling) through heat conduction, thereby achieving precise regulation of the battery cell temperature.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This new type of submersible battery pack assembly significantly enhances the safety protection capabilities of the battery cells. The battery module assembly is completely submerged in an insulating immersion liquid. When a single cell catches fire, the immersion liquid can directly absorb heat and isolate oxygen in the initial stage of the fire, preventing the fire from spreading to other cells at the source. This completely avoids the risk of the entire battery pack catching fire and ensures the safe operation of the energy storage system.

[0022] The direct cooling plate assembly is in direct contact with the immersion liquid, which then exchanges heat with the cell surface in a "wrap-around" manner. Compared to the localized indirect contact of traditional bottom cooling, the heat exchange efficiency is greatly improved. Even when the cell is under high-intensity charge and discharge conditions, the cell temperature can be stably controlled within a preset range, avoiding performance degradation or failure caused by high temperature and extending the battery pack's lifespan.

[0023] The direct cooling plate is sealed with high-temperature welding, and the penetration point is sealed with fluororubber grooves to reduce cooling medium leakage from the source. Even if a small amount of leakage occurs, the cooling medium can evaporate naturally at room temperature without reducing the insulation withstand voltage performance of the immersion liquid. No emergency shutdown maintenance is required, ensuring long-term stable operation of the battery pack.

[0024] The top of the enclosure features a filling port and a drain valve to prevent the immersion fluid from overflowing, and the filling and draining operations are convenient. The high-pressure connector, low-pressure connector, and BMS are all mounted on the top of the outer side of the enclosure, facilitating direct maintenance without the need to drain the immersion fluid. The enclosure has excellent sealing performance and a low immersion fluid leakage rate. Combined with long-life sealing components, it enables low-frequency maintenance, significantly reducing system downtime and lowering after-sales costs. Attached Figure Description

[0025] Figure 1 This is one of the overall structural schematic diagrams of this utility model; Figure 2 This is the second schematic diagram of the overall structure of this utility model; Figure 3 This is one of the structural schematic diagrams of the battery module assembly in this utility model; Figure 4 This is the second structural schematic diagram of the battery module assembly in this utility model; The meanings of the labels in the diagram are as follows: 1. Housing; 2. BMS; 3. Drain valve; 4. Drain valve; 5. Filling port; 6. Direct cooling plate inlet; 7. Direct cooling plate outlet; 8. Low-voltage connector; 9. High-voltage connector; 10. Direct cooling plate assembly; 11. Battery module assembly; 111. Wiring harness assembly; 112. Battery cell; 113. End plate; 114. Steel strip; 115. Foam; 116. Copper busbar fixing plastic parts; 117. Aluminum busbar; 118. Copper-aluminum busbar connector; 119. Plastic cover. Detailed Implementation

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

[0027] This utility model provides a novel submersible battery pack assembly, such as Figures 1-4 As shown, it includes a housing 1, which contains an immersion liquid, a battery module assembly 11, and a direct cooling plate assembly 10. Both the battery module assembly 11 and the direct cooling plate assembly 10 are completely immersed in the immersion liquid. The top of the tank 1 is equipped with a filling port 5, a drain valve 4 and a discharge valve 3. The drain valve 4 is used to limit the level of the immersion liquid from not exceeding the upper surface of the tank 1. The top of the outer side of the housing 1 is equipped with a high-voltage connector 9, a low-voltage connector 8 and a BMS2. The high-voltage connector 9 is electrically connected to the battery module assembly 11, and the low-voltage connector 8 is electrically connected to the BMS2 and the battery module assembly 11 respectively. The direct cooling plate assembly 10 is provided with a direct cooling plate inlet 6 and a direct cooling plate outlet 7. The direct cooling plate inlet 6 and the direct cooling plate outlet 7 penetrate the wall of the housing 1 and are connected to the external cooling pipe.

[0028] By constructing a core structure of "box 1 + immersion liquid + battery module assembly 11 + direct cooling plate assembly 10", the battery module assembly 11 and the direct cooling plate assembly 10 are completely immersed in the immersion liquid, and the encapsulation property of the liquid is used to achieve heat transfer and fire control. At the same time, a filling port 5, a drain valve 4 and a discharge valve 3 are set on the top of the box 1. The drain valve 4 controls the immersion liquid level to not exceed the upper surface of the box 1 to avoid overflow. The high-voltage connector 9, the low-voltage connector 8 and the BMS2 are assembled on the top of the outer side of the box 1 to achieve electrical connection while avoiding the risk of contact with the immersion liquid. The direct cooling plate inlet 6 and the direct cooling plate outlet 7 of the direct cooling plate assembly 10 penetrate the wall of the box 1 and are connected to the external cooling pipe to build a heat dissipation circulation path.

[0029] It lays the foundation for the entire battery pack assembly's basic structural framework. Relying on core components such as the housing 1, battery module assembly 11, and direct cooling plate assembly 10, it realizes the core functions of cell heat dissipation, fire protection, electrical connection, and cooling circulation. It comprehensively solves the problems of insufficient heat dissipation, inability to control fires in a timely manner, and susceptibility of electrical components (high voltage connector 9, low voltage connector 8, BMS2) to liquids in existing solutions, thus ensuring the basic operational requirements of the battery pack.

[0030] In this embodiment, the housing 1 is formed by welding or stamping iron plate, and the surface is treated with anti-corrosion and insulation. The sealing structure of the housing 1 meets the requirements of no weld defects at the welding point, no cracks at the stamping point, and no leakage at the connection point with other components, ensuring that the immersion liquid does not leak. The direct cooling plate assembly 10 includes an aluminum cooling plate body and a copper joint. The aluminum cooling plate body and the copper joint are fixed by high-temperature welding.

[0031] The materials and processes of the housing 1 and the direct cooling plate assembly 10 are optimized. The housing 1 is made of iron plate through welding or stamping. The high strength of the iron plate ensures the load-bearing capacity for the internal immersion liquid and the battery module assembly 11. The welding / stamping process ensures the structural integrity of the housing 1. The surface anti-corrosion and insulation treatment prevents the housing 1 from rusting and leaking. The direct cooling plate assembly 10 includes an aluminum cooling plate body and a copper connector. The lightweight and high thermal conductivity of the aluminum cooling plate body and the excellent electrical conductivity and corrosion resistance of the copper connector are used to achieve a firm connection between the two through high-temperature welding, ensuring sealing and thermal conductivity. At the same time, the quality of the sealing structure of the housing 1 is strictly controlled (no weld defects at the welded joints, no cracks at the stamping joints, and no leakage at the connection points with other components) to prevent the immersion liquid from leaking. The structural strength, durability, and sealing of the housing 1 and the direct cooling plate assembly 10 are improved, extending the service life of the battery pack. The aluminum-copper combination direct cooling plate assembly 10 design balances lightweight and thermal conductivity, reducing the overall weight of the battery pack. The strict sealing control of the housing 1 prevents leakage of immersion liquid, preventing insulation failure and damage to components such as the battery module assembly 11 caused by leakage, and ensuring the long-term stable operation of the battery pack.

[0032] Specifically, the grooved sealing structure is used at the penetration points between the direct cooling plate inlet 6, the direct cooling plate outlet 7 and the housing 1, and the sealing ring of the grooved sealing structure is made of fluororubber material.

[0033] A grooved sealing structure is adopted at the penetration points of the direct cooling plate inlet 6 and direct cooling plate outlet 7 of the direct cooling plate assembly 10 with the housing 1. The grooves enhance the sealing stability by limiting the sealing ring. The sealing ring is made of fluororubber, which relies on the excellent corrosion resistance, high temperature resistance, and sealing performance of fluororubber, as well as its good compatibility with the immersion fluid, to maintain the sealing performance for a long time. This prevents the cooling medium in the external cooling pipe from leaking into the housing 1 from the penetration points of the direct cooling plate inlet 6 and direct cooling plate outlet 7 with the housing 1. This solves the sealing problem of the connection between the direct cooling plate inlet 6 and direct cooling plate outlet 7 and the housing 1, avoids the leakage of cooling medium from damaging the insulation environment inside the housing 1 and affecting the performance of the immersion fluid, further improves the sealing reliability of the battery pack, reduces safety hazards caused by sealing failure, and ensures the normal operation of the cooling circulation system composed of the direct cooling plate assembly 10 and the external cooling pipe.

[0034] Furthermore, the battery module assembly 11 includes a battery cell 112, a wiring harness assembly 111, an end plate 113, a steel strip 114, foam 115, a copper busbar fixing plastic part 116, an aluminum busbar 117, a copper-aluminum busbar connector 118, and a plastic cover 119. The battery cell 112 is fixed by the steel strip 114, the end plate 113, and the foam 115. The aluminum busbar 117 is electrically connected to the battery cell terminal through the copper-aluminum busbar connector 118. The copper busbar fixing plastic part 116 limits the aluminum busbar 117. The plastic cover 119 covers the top of the battery cell 112.

[0035] The battery module assembly 11 features a refined structural design. The battery module assembly 11 includes a battery cell 112, a wiring harness assembly 111, an end plate 113, a steel strip 114, foam 115, a copper busbar fixing plastic part 116, an aluminum busbar 117, a copper-aluminum busbar connector 118, and a plastic cover 119. The steel strip 114, end plate 113, and foam 115 secure the battery cell 112 from all sides and sides, preventing it from shaking or colliding during operation. The copper-aluminum busbar connector 118 ensures a reliable electrical connection between the aluminum busbar 117 and the battery cell 112 terminals, guaranteeing stable current transmission. The copper busbar fixing plastic part 116 limits the movement of the aluminum busbar 117, preventing it from shifting and affecting the electrical connection. The plastic cover 119 covers the top of the battery cell 112, providing protection and integrating the internal structure of the module. The battery module assembly 11 improves structural stability and electrical connection reliability, reduces damage to the battery cell 112 caused by shaking and collision, and avoids poor contact and overheating caused by loose connections of electrical components such as aluminum busbar 117 and copper-aluminum busbar connector 118. The modular structure design of the battery module assembly 11 facilitates the assembly and maintenance of the battery cell 112, ensures the overall safe operation of the module, and lays the foundation for stable power supply to the battery pack through the high-voltage connector 9.

[0036] Furthermore, BMS2 is used to collect voltage and temperature data of the battery module assembly 11 and control the charging and discharging rate of the battery module assembly 11 to keep the cell temperature within a preset target range.

[0037] Utilizing the monitoring and control functions of the BMS2, the BMS2 is connected to the battery module assembly 11 via the low-voltage connector 8. This allows for the collection of voltage and temperature data from the cells 112 within the battery module assembly 11, providing real-time monitoring of the cell 112's operating status. When an abnormal voltage or temperature exceeding a preset range is detected in a cell 112, the BMS2 issues commands to control the charging and discharging rate of the battery module assembly 11, adjusting the cell 112's operating state to maintain its temperature within a suitable range, preventing overcharging, over-discharging, or overheating. Through the cooperation of the BMS2 and the low-voltage connector 8, precise monitoring and dynamic adjustment of the cell 112's operating status are achieved, preventing performance degradation or safety accidents caused by overcharging, over-discharging, or overheating, and extending the cell 112's lifespan. Furthermore, it ensures the stability of the voltage and current output from the battery module assembly 11 via the high-voltage connector 9, improving the safety and reliability of the battery pack operation and adapting to power supply requirements under different operating conditions.

[0038] Furthermore, the immersion liquid is insulating and allows leaked refrigerant to evaporate naturally at room temperature without reducing its own insulation and withstand voltage performance.

[0039] The immersion fluid inside the housing 1 is given insulating properties, preventing leakage when it comes into contact with electrical components such as the battery cells 112 and aluminum busbars 117 in the battery module assembly 11. Simultaneously, utilizing the physical properties of the immersion fluid, any refrigerant leaking from the direct cooling plate assembly 10 can naturally evaporate at room temperature without mixing with the immersion fluid, thus ensuring that the insulating withstand voltage performance of the immersion fluid remains unaffected and eliminating the need for frequent immersion fluid replacements. This solves the problem of cooling medium leakage leading to decreased immersion fluid performance and the need for frequent replacements in existing immersion solutions, reducing maintenance costs and downtime. The insulating properties of the immersion fluid further enhance the electrical safety performance of the battery pack, preventing safety hazards such as short circuits in the battery module assembly 11 and leakage in the housing 1 caused by liquid conductivity.

[0040] Furthermore, the cold plate body of the direct cooling plate assembly 10 is in direct contact with the immersion liquid, and the immersion liquid is heated or cooled through heat exchange, thereby regulating the temperature of the battery cell through heat exchange between the immersion liquid and the surface of the battery cell 112.

[0041] A two-stage heat exchange path is constructed: "direct cooling plate assembly 10 - immersion liquid - battery cell 112 of battery module assembly 11". The cooling plate body of the direct cooling plate assembly 10 is in direct contact with the immersion liquid inside the housing 1, and heat exchange between the direct cooling plate assembly 10 and the immersion liquid is achieved through heat conduction, thus regulating the temperature of the immersion liquid. The immersion liquid, after temperature change, comes into contact with the surface of the battery cell 112 of battery module assembly 11, and heat is transferred to the battery cell 112 (heating) or absorbed from the battery cell 112 (cooling) through heat conduction, thus achieving precise temperature regulation of the battery cell 112. This significantly improves the temperature regulation efficiency of the battery cell 112. Compared with the traditional single heat exchange path of bottom cooling, the two-stage heat exchange path of "direct cooling plate assembly 10 - immersion liquid - battery cell 112" makes heat transfer more uniform and faster, ensuring that the battery cell 112 can maintain within the preset temperature range even under high-intensity charge and discharge conditions, avoiding the impact of high temperature on the performance and life of the battery cell 112, and further optimizing the heat dissipation and heating effect of the battery pack.

[0042] Finally, it should be noted that the electronic components in the battery module assembly 11 and other components in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between each electrical component in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel submersible battery pack assembly, characterized in that: Includes a housing (1), the housing (1) contains an immersion liquid, a battery module assembly (11) and a direct cooling plate assembly (10), the battery module assembly (11) and the direct cooling plate assembly (10) are both completely immersed in the immersion liquid; The top of the box (1) is provided with a filling port (5), a drain valve (4) and a discharge valve (3). The drain valve (4) is used to limit the level of the immersion liquid from not exceeding the upper surface of the box (1). The top of the outer side of the housing (1) is equipped with a high-voltage connector (9), a low-voltage connector (8) and a BMS (2). The high-voltage connector (9) is electrically connected to the battery module assembly (11), and the low-voltage connector (8) is electrically connected to the BMS (2) and the battery module assembly (11) respectively. The direct cooling plate assembly (10) is provided with a direct cooling plate inlet (6) and a direct cooling plate outlet (7). The direct cooling plate inlet (6) and the direct cooling plate outlet (7) penetrate the wall of the housing (1) and are connected to the external cooling pipe.

2. The novel submersible battery pack assembly according to claim 1, characterized in that: The enclosure (1) is made of iron plate by welding or stamping process, and the surface is treated with anti-corrosion and insulation. The sealing structure of the enclosure (1) meets the requirements of no weld defects at the welding point, no cracks at the stamping point, and no leakage at the connection point with other components, ensuring that the immersion liquid does not leak. The direct cooling plate assembly (10) includes an aluminum cooling plate body and a copper joint. The aluminum cooling plate body and the copper joint are fixed by high-temperature welding.

3. The novel submersible battery pack assembly according to claim 1, characterized in that: The groove sealing structure is adopted at the penetration point between the direct cooling plate inlet (6), the direct cooling plate outlet (7) and the box body (1), and the sealing ring of the groove sealing structure is made of fluororubber material.

4. The novel submersible battery pack assembly according to claim 1, characterized in that: The battery module assembly (11) includes a battery cell (112), a wiring harness assembly (111), an end plate (113), a steel strip (114), foam (115), a copper busbar fixing plastic part (116), an aluminum busbar (117), a copper-aluminum busbar connector (118), and a plastic cover (119). The battery cell (112) is fixed by the steel strip (114), the end plate (113), and the foam (115). The aluminum busbar (117) is electrically connected to the battery cell terminal through the copper-aluminum busbar connector (118). The copper busbar fixing plastic part (116) limits the aluminum busbar (117). The plastic cover (119) covers the top of the battery cell (112).

5. The novel submersible battery pack assembly according to claim 4, characterized in that: The BMS (2) is used to collect voltage and temperature data of the battery module assembly (11) and control the charging and discharging rate of the battery module assembly (11) so that the cell temperature is maintained within the preset target range.

6. The novel submersible battery pack assembly according to claim 5, characterized in that: The immersion liquid is insulating and allows leaked refrigerant to evaporate naturally at room temperature without reducing its own insulation and withstand voltage performance.

7. The novel submersible battery pack assembly according to claim 6, characterized in that: The cold plate body of the direct cooling plate assembly (10) is in direct contact with the immersion liquid. The immersion liquid is heated or cooled through heat exchange, and the temperature of the battery cell is adjusted through heat exchange between the immersion liquid and the surface of the battery cell (112).

Images