Energy storage fully submerged battery module flow channel and pressure regulating device

Abstract

The application discloses a kind of energy storage full-submerged battery module flow channel and pressure regulating device, including battery module, the battery module is equipped with battery, flow guide assembly, pressure regulating plate, three are sequentially alternately stacked and arranged to form battery stack, battery stack both ends are equipped with end plate and are fixed by locking rolling strip, the flow guide assembly is combined with pressure regulating plate to form submerged liquid flow channel, submerged liquid enters from battery bottom, and top flows out, realize to battery six face three-dimensional heat exchange, the pressure regulating plate uses elastic material, can be compressed when battery cell expands, reduce flow channel cross-sectional area, improve local flow velocity, enhance heat dissipation capacity, while release expansion pressure.The application has compact structure, high heat dissipation efficiency, with pressure self-adapting regulating ability, can effectively improve the safety and service life of energy storage system.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology for energy storage batteries, specifically to a fully submerged energy storage battery module, which is particularly suitable for immersion cooling and pressure regulation of batteries in large-capacity, high-energy-density energy storage systems. Background Technology

[0002] Currently, temperature control systems in the field of electrochemical energy storage mainly rely on air cooling and liquid cooling, primarily for high-temperature cooling of battery packs. However, air cooling has low heat transfer efficiency, poor temperature uniformity among individual cells within the battery pack, and high energy consumption. Liquid cooling solutions pose a risk of leakage and are prone to condensation due to the low temperature of the liquid cooling plate. Furthermore, in current mainstream liquid cooling methods, the thermal conductivity along the Z-axis of the cell height (71173 square cell) is low, resulting in significant differences in temperature between individual cells along the Z-axis during operation. Immersion liquid cooling solutions currently on the market use "U"-shaped plates for large-area cooling. However, these solutions suffer from several drawbacks: first, they do not consider the release of expansion pressure during the cell's lifecycle, affecting cell cycle life; second, the insulation between the "U"-shaped flow channel plate and the cell is usually poor, making the insulation susceptible to damage at high temperatures. Summary of the Invention

[0003] The purpose of this invention is to provide a flow channel and pressure regulation device for a fully submerged energy storage battery module, so as to solve the problems of uneven heat dissipation of the battery cells, inability to release expansion pressure, and poor insulation performance in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A flow channel and pressure regulating device for a fully submerged energy storage battery module includes multiple batteries, multiple flow guiding assemblies, and multiple pressure regulating plates. The batteries, flow guiding assemblies, and pressure regulating plates are stacked alternately in sequence to form a battery stack. End plates are provided at both ends of the battery stack, and the whole is fixed by locking strips. The flow guiding assemblies and pressure regulating plates are combined to form a submerged liquid flow channel, and the submerged liquid enters from the bottom of the battery and flows out from the top, realizing three-dimensional heat exchange on six sides of the lithium-ion battery.

[0005] Furthermore, the pressure regulating plate is made of an elastic material that can be compressed when the lithium-ion battery expands, thereby reducing the cross-sectional area of ​​the flow channel, increasing the local flow velocity, and enhancing heat dissipation. This adaptive regulation mechanism not only releases the cell expansion pressure but also improves heat dissipation efficiency.

[0006] Furthermore, the current-conducting assembly is made of rigid material, possessing good insulation performance and structural strength, ensuring electrical safety between battery cells.

[0007] Furthermore, the flow guiding assembly and the pressure regulating plate form multiple flow channels to guide the immersion liquid to be evenly distributed to the surface of each battery, avoiding local hot spots.

[0008] Furthermore, the battery stack is also equipped with a flexible FPC and busbars for electrical connections and signal acquisition between batteries, facilitating monitoring of battery status.

[0009] Furthermore, the spaced arrangement of the flow guide assembly and the pressure regulating plate allows the immersion liquid to contact all six sides of the lithium-ion battery simultaneously, achieving all-round heat exchange and significantly improving temperature uniformity.

[0010] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a novel design, which can realize the timely heat transfer of the large surface of the battery cell in the pack, and can ensure that the extrusion pressure of the large surface of the battery cell is kept within the required range of the battery cell; it can realize the insulation between batteries and ensure the electrical safety between the battery cells; under the condition of a certain flow rate, the subsequent expansion and compression pressure adjustment plate of the battery cell reduces the flow channel area, increases the flow rate, and improves the heat dissipation efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the flow channel structure of the present invention; In the diagram, 10-battery module; 11-battery; 12-current guide assembly; 13-pressure regulating plate; 14-end plate; 15-flexible FPC; 16-busbar; 17-locking strip; 100-flow channel Detailed Implementation

[0012] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1 The fully submerged battery module 10 of this embodiment includes multiple lithium-ion batteries 11, multiple current-conducting assemblies 12, and multiple pressure regulating plates 13. These components are arranged in alternating layers in sequence, that is, a current-conducting assembly and a pressure regulating plate are placed between every two lithium-ion batteries to form a compact battery stack. End plates 14 are installed at both ends of the battery stack, and the whole assembly is bundled and fixed by locking straps 17 to ensure structural stability.

[0014] like Figure 2As shown, the flow guide assembly 12 and the pressure regulating plate 13 combine to form a gap flow channel 100. The immersion liquid enters from the bottom of the battery stack, flows upward along the flow channel, and exits from the top. During this process, the immersion liquid fully contacts all six sides of the lithium-ion battery, efficiently removing heat. The multiple flow channels 100 formed by the combination ensure uniform liquid distribution and prevent short-circuit flow.

[0015] like Figure 2 As shown, when the lithium-ion battery 11 expands during cyclic use, it compresses the adjacent pressure regulating plate 13. Since the pressure regulating plate 13 is made of an elastic material (such as silicone rubber), it is compressed and deformed, thereby reducing the flow channel cross-sectional area. According to fluid mechanics principles, the increased flow velocity leads to a higher local heat transfer coefficient, thus enhancing heat dissipation and compensating for the increased internal thermal resistance after the cell expands. Simultaneously, the elastic deformation of the pressure regulating plate 13 releases the mechanical stress generated by the cell expansion, protecting the cell from excessive pressure damage.

[0016] The flow guide assembly 12 is made of rigid material, while the pressure regulating plate 13 is made of silicone rubber, which ensures both the rigidity of the flow channel and absorbs the expansion force between the cells. The flexible FPC 15 and the busbar 16 are arranged inside the battery stack to collect voltage and temperature signals and realize series and parallel connections.

[0017] In this embodiment, the immersion fluid can be fluorinated liquid, mineral oil, or other insulating coolant, with the specific type selected according to system requirements. The materials of the flow guiding assembly and pressure regulating plate can also be adjusted according to actual operating conditions.

[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully submersible energy storage battery module, characterized in that, include: Multiple batteries (11); multiple flow guiding assemblies (12); multiple pressure regulating plates (13); the batteries (11), flow guiding assemblies (12) and pressure regulating plates (13) are stacked alternately in sequence to form a battery stack; The battery stack is provided with end plates (14) at both ends, and the whole is fixed by locking strips (17); The flow guide assembly (12) and the pressure regulating plate (13) are combined to form an immersion liquid flow channel (100). The immersion liquid enters from the bottom of the battery and flows out from the top, realizing three-dimensional heat exchange on the six sides of the battery.

2. The energy storage fully submerged battery module according to claim 1, characterized in that: The pressure regulating plate (13) is made of an elastic material and can be compressed when the battery (11) expands, thereby reducing the cross-sectional area of ​​the flow channel, increasing the local flow rate, and enhancing the heat dissipation capacity.

3. A fully submerged energy storage battery module according to claim 1 or 2, characterized in that: The flow guiding assembly (12) is made of rigid material and has insulation properties and structural strength.

4. The energy storage fully submerged battery module according to claim 1, characterized in that: The flow guide assembly (12) and the pressure regulating plate (13) are combined to form multiple flow channels (100) for guiding the immersion liquid to be evenly distributed to the surface of each battery.

5. The energy storage fully submerged battery module according to claim 1, characterized in that: The battery stack is also equipped with a flexible FPC (15) and a busbar (16) for electrical connection and signal acquisition between batteries.

6. The energy storage fully submerged battery module according to claim 1, characterized in that: The spaced arrangement of the flow guide assembly (12) and the pressure regulating plate (13) allows the immersion liquid to contact all six sides of the lithium-ion battery simultaneously, achieving all-round heat exchange.

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