Power battery module structure

Abstract

The utility model discloses a power battery module structure in the field of battery module, including power battery module structure, including frame, be provided with multiple electric core in the frame, the frame outside is provided with FPC subassembly and BMS subassembly, multiple electric core is sequentially stacked and is set in the frame, and the electric core among multiple is provided with the foam layer and the heat conduction layer, and the electric core stacking mode of power battery module, BMS position layout, frame structure, heat conduction path, fire -retardant heat -insulation and the integrated setting mode of FPC subassembly, reduce the structural member weight satisfaction battery module high energy density demand while guaranteeing the strength, improved the heat conduction efficiency of battery module satisfaction battery module high heat dissipation performance demand, high safety performance requirement, and reduced the assembly difficulty of battery module, is very suitable for mass production.

Description

Technical Field

[0001] This utility model relates to the field of battery modules, and in particular to a power battery module structure. Background Technology

[0002] Electric vertical takeoff and landing (EVTOL) aircraft represent one of the most disruptive innovations in the low-altitude economy in recent years. Combining new energy power, vertical takeoff and landing technology, and intelligent flight control, they are reshaping multiple industries, including future urban transportation, logistics, and emergency rescue. The battery pack in an EVTOL aircraft is its core power system, requiring stringent requirements such as high energy density, high power output, rapid charging and discharging, efficient heat dissipation, adaptability to extreme environments, and aviation-grade safety standards. Battery modules commonly used in the new energy vehicle industry have low integration efficiency and account for an excessively large proportion of structural weight in aircraft. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to improve the integration and structural weight of the battery module.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A power battery module structure includes a frame, in which multiple battery cells are disposed, and an FPC assembly and a BMS assembly are disposed on the outside of the frame. The multiple battery cells are stacked sequentially within the frame, and a foam layer and a thermally conductive layer are sandwiched between the multiple battery cells.

[0005] Furthermore, multiple battery cells are stacked sequentially in a vertical direction to form a rectangular block.

[0006] Furthermore, from top to bottom, a layer of foam, a layer of battery cell, a layer of thermal conductive layer, and a layer of battery cell form a stacking unit, and multiple stacking units are stacked horizontally in the vertical direction to form a rectangular block.

[0007] Furthermore, the BMS component is positioned at the top of the frame.

[0008] Furthermore, the battery cell includes a semi-solid pouch ternary lithium battery.

[0009] Furthermore, the foam layer is made of ceramic silicone material.

[0010] Furthermore, the heat-conducting layer is an L-shaped plate.

[0011] Furthermore, the FPC assembly includes a flexible PCB board and a rigid PCB board, the flexible PCB board being connected to the battery cell, and the rigid PCB board being connected to the BMS assembly.

[0012] Furthermore, the frame is designed with a hollowed-out shape.

[0013] Furthermore, the frame is provided with reinforcing ribs.

[0014] The beneficial effects of this utility model are: The cell stacking method, BMS location layout, frame structure, heat conduction path, flame retardant insulation, and FPC component integration of the power battery module reduce the weight of structural components while ensuring strength, meet the high energy density requirements of the battery module, improve the thermal conductivity of the battery module to meet the high heat dissipation performance and high safety performance requirements of the battery module, and reduce the assembly difficulty of the battery module, making it very suitable for mass production. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the overall structure of this utility model after installation; Figure 3 This is a schematic diagram of the battery cell stacking structure of this utility model; The diagram is labeled as follows: 1-BMS component, 2-foam layer, 3-thermal conductive layer, 4-battery cell, 5-base plate, 6-frame, 7-mounting plate, 8-current collector, 9-FPC component. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figures 1-3 As shown in the figure, this application proposes a power battery module structure, including a frame 6. Multiple battery cells 4 are disposed within the frame 6, and an FPC assembly 9 and a BMS assembly 1 are disposed on the outer side of the frame 6. The multiple battery cells 4 are stacked sequentially within the frame 6, with a foam layer 2 and a thermally conductive layer 3 sandwiched between them. The frame 6 also includes a connecting plate 5, a mounting plate 7, and a current collector 8. The connecting plate 5 is used to connect the thermally conductive layer 3 in series, ensuring the installation stability of the thermally conductive layer 3. The mounting plate 7 and the current collector 8 are connected to form a mounting panel for mounting the FPC assembly 9, fully ensuring installation stability and convenient electrical connection. The battery cells 4 are semi-solid-state soft-pack ternary lithium batteries, taking into account the high energy density, high discharge rate, and high safety requirements of electric vertical takeoff and landing aircraft.

[0018] First, it should be stated that the cell stacking method, BMS location layout, frame structure, heat conduction path, flame retardant insulation, and FPC component integration of the power battery module reduce the weight of structural components while ensuring strength, meeting the high energy density requirements of the battery module, improving the thermal conductivity of the battery module to meet the high heat dissipation performance and high safety performance requirements of the battery module, and reducing the assembly difficulty of the battery module, making it very suitable for mass production.

[0019] Multiple battery cells 4 are stacked vertically to form a rectangular block. They can be stacked in an alternating or inclined manner, which ensures that the overall volume of the multiple battery cells 4 after installation is small, reducing space occupation; and can better adapt to the flat installation space on electric vertical take-off and landing aircraft.

[0020] In this embodiment, multiple battery cells 4 are horizontally stacked with their edges flush. The square structure formed by the multiple battery cells 4 allows the bottom of the battery module to be placed adjacent to each other on both sides of the liquid cooling plate when assembling the battery pack. This improves the utilization rate of the heat exchange surface of the liquid cooling plate, reduces the weight of the liquid cooling plate, and improves the assembly efficiency of the battery cells 4. From top to bottom, a layer of foam 2, a layer of battery cells 4, a layer of heat-conducting layer 3, and another layer of battery cells 4 form a stacking unit. Multiple stacking units are horizontally stacked in the vertical direction to form a rectangular block. That is, a foam layer 2 is placed between two stacked battery cells 4 to absorb the expansion and deformation of the battery cells 4 during charging and discharging, and also to provide insulation. A heat-conducting layer 3 is placed between two stacked battery cells 4, staggered from the foam layer 2 by one layer of battery cells 4, to absorb the heat generated by the battery cells 4 during charging and discharging, and directly transfer the heat to the liquid cooling plate at the bottom of the battery cells 4. This method allows the heat of each battery cell 4 to be directly transferred to the liquid cooling plate with minimal use of heat-conducting layer 3, reducing the weight of the overall structure.

[0021] The foam layer 2 uses ceramicized silicone foam material, which has a density comparable to aerogel and combines the flexibility of silicone rubber with the high-temperature stability of ceramic materials. Under high-temperature environments, it can form a dense ceramic layer, effectively blocking the transfer of heat and flame, thus improving the safety of the battery module. The thermally conductive layer 3 is an L-shaped plate, used to transform the irregular heat exchange contact surface of the battery cell 4 into a regular plane, increasing the heat transfer area between the thermally conductive layer 3 and the liquid cooling plate, and improving heat exchange efficiency. To facilitate the installation process, the BMS component 1 is located at the top of the frame 6, meaning that the BMS component 1 is not located on the front of the frame 6. This avoids insulation problems that may occur if it is placed on the front of the module and also provides good maintainability.

[0022] The FPC component 9 includes a flexible PCB board and a rigid PCB board. The flexible PCB board is connected to the battery cell 4, and the rigid PCB board is connected to the BMS component 1. The entire structure reduces the weight of cables and the corresponding cable constraints and other assembly structures and weights, thus reducing the assembly difficulty.

[0023] In addition, in order to further reduce the overall structural weight while increasing the structural support strength, the frame 6 is hollow and is equipped with reinforcing ribs; that is, except for the necessary strength structural ribs, the rest of the frame 6 adopts a hollow design to reduce the weight of structural components and improve assembly efficiency.

[0024] In summary, this utility model proposes a power battery module structure. Multiple battery cells 4 are stacked sequentially within a frame 6, with a foam layer 2 and a heat-conducting layer 3 sandwiched between the cells 4. This improves the integration efficiency, heat dissipation efficiency, and structural reliability of the power battery module used in electric vertical takeoff and landing aircraft. The BMS component 1 is placed at the top of the frame 6, avoiding insulation problems that might occur if placed on the front of the module, while also providing good maintainability. The arrangement of the foam layer 2 and the heat-conducting layer 3 absorbs the expansion and deformation of the battery cells 4 during charging and discharging. While providing insulation, it also allows the heat from each battery cell 4 to be directly transferred to the liquid cooling plate with minimal heat-conducting plate usage, reducing the weight of the heat-conducting plate. The combination of flexible and rigid PCB boards reduces cable weight and associated assembly structures and weight, lowering the assembly difficulty.

Claims

1. A power battery module structure, comprising a frame (6), wherein multiple battery cells (4) are disposed within the frame (6), and an FPC assembly (9) and a BMS assembly (1) are disposed on the outer side of the frame (6), characterized in that, Multiple battery cells (4) are stacked sequentially within the frame (6), and a foam layer (2) and a heat-conducting layer (3) are sandwiched between the multiple battery cells (4).

2. The power battery module structure according to claim 1, characterized in that, Multiple battery cells (4) are stacked in sequence along the vertical direction to form a rectangular block.

3. The power battery module structure according to claim 2, characterized in that, A stacking unit is composed of a layer of foam (2), a layer of battery cell (4), a layer of heat-conducting layer (3), and a layer of battery cell (4) from top to bottom. Multiple stacking units are stacked horizontally in the vertical direction to form a rectangular block.

4. The power battery module structure according to claim 1, characterized in that, The BMS component (1) is located at the top of the frame (6).

5. The power battery module structure according to claim 1, characterized in that, The cell (4) includes a semi-solid soft-pack ternary lithium battery.

6. The power battery module structure according to claim 1, characterized in that, The foam layer (2) is made of ceramic silicone material.

7. The power battery module structure according to claim 1, characterized in that, The heat-conducting layer (3) is an L-shaped plate.

8. The power battery module structure according to claim 1, characterized in that, The FPC assembly (9) includes a flexible PCB board and a rigid PCB board. The flexible PCB board is connected to the battery cell (4), and the rigid PCB board is connected to the BMS assembly (1).

9. The power battery module structure according to claim 1, characterized in that, The frame (6) is designed with a hollowed-out shape.

10. The power battery module structure according to claim 1, characterized in that, The frame (6) is provided with reinforcing ribs.

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