Stacked natural cold air energy storage battery pack

Abstract

The utility model relates to a kind of stacked natural cold air energy storage battery pack, comprising: base, for supporting energy storage battery pack;Several battery modules are stacked on the base, and the positive and negative electrode of adjacent battery module is connected in series;Wherein, each battery module includes frame, several series connection settings battery core and heat sink;Support frame is obliquely arranged in the inside of frame, and the inside space of frame is divided into battery core storage area and air cooling channel;Air cooling channel is used to guide natural convection air to realize the heat dissipation of stack battery core, its longitudinal section is upper expansion trapezoidal, and horizontal section is rectangular;The both sides of frame are provided with air inlet and air outlet communicated with air cooling channel, heat sink is embedded in air cooling channel, and is connected with support frame, and contact with the side of battery core towards air cooling channel.The utility model is by being provided with independent air cooling channel structure, without interlayer wind stringing, can significantly reduce battery core temperature rise and reduce the temperature difference between adjacent battery module, realize zero energy consumption natural cooling.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical energy storage system technology, and in particular to a stacked natural cooling air energy storage battery pack. Background Technology

[0002] With the rapid development of renewable energy, energy storage systems are playing an increasingly important role in power peak shaving, grid stability, and distributed energy integration. Currently, most mainstream energy storage battery systems employ forced air cooling or liquid cooling for thermal management to ensure temperature stability during high-rate charging and discharging. However, these cooling systems are complex in structure, consume a lot of energy, and have high maintenance costs. Furthermore, they are susceptible to risks such as coolant leakage and fan failure during long-term operation, reducing the reliability and safety of the system.

[0003] Furthermore, traditional energy storage battery systems are mostly fixed installations, resulting in low space utilization and poor scalability, making it difficult to meet the modularity, stacking, and rapid deployment requirements of large-scale energy storage scenarios. While some natural cooling solutions can simplify the system structure, they still suffer from uneven heat dissipation and excessive temperature rise in the thermal management of high-energy-density battery modules, limiting their adoption in high-power applications. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low space utilization, inconvenient expansion, and inability to achieve true modular stacking and rapid deployment in the existing battery cabinet, and to provide a stacked natural air cooling energy storage battery pack that has high heat dissipation efficiency, high modularity and no need for external energy consumption, thus achieving heat dissipation and cooling.

[0005] To solve the above-mentioned technical problems, this utility model provides a stacked natural air cooling energy storage battery pack, comprising: The base is used to support the energy storage battery pack; Several battery modules are stacked on the base, and the positive and negative terminals of adjacent battery modules are connected in series. Each battery module includes a frame, several battery cells arranged in series, and a heat sink. A support frame is inclined inside the frame, dividing the internal space of the frame into a battery cell storage area and a cooling channel. The battery cell storage area is used to accommodate and fix the battery cells. The cooling channel is used to guide natural convection air to achieve heat dissipation of the battery cells. Its longitudinal section is an upwardly expanding trapezoid, and its transverse section is rectangular. The frame has air inlets and outlets on both sides that communicate with the cooling channel. The heat sink is embedded in the cooling channel and connected to the support frame, and contacts the side of the battery cell facing the cooling channel.

[0006] In one embodiment of this utility model, the support frames inside the frames of adjacent battery modules are inclined in the same direction, so that the multi-layer air-cooling channels form a spiral upward airflow path, prolonging the air residence time and enhancing heat exchange.

[0007] In one embodiment of this utility model, the cross-sectional area of ​​the air inlet is smaller than the cross-sectional area of ​​the air outlet, forming a diffuser duct to reduce airflow resistance and increase flow velocity.

[0008] In one embodiment of this utility model, both the air inlet and the air outlet are composed of a plurality of holes, which are one or more combinations of circular, elliptical, elongated, or louvered holes.

[0009] In one embodiment of this utility model, the top surface of the battery module is provided with an upper socket and the bottom surface is provided with a lower plug. The upper socket and the lower plug are paired composite connectors, which work together to realize the electrical and mechanical connection between adjacent battery modules.

[0010] In one embodiment of this utility model, the upper socket and the lower socket include a guide positioning block and a connecting terminal. The guide positioning block is used for alignment when stacked, and the connecting terminal is embedded in the guide positioning block for series conduction of current.

[0011] In one embodiment of the present invention, the heat sink includes a substrate and a fin structure, wherein the fin structure is integrally formed with the substrate.

[0012] In one embodiment of this utility model, the support frame is provided with an embedding groove and a fixing plate. The embedding groove is used to embed the battery cell, and the fixing plate is used to fix the battery cell. It is made of a thermally conductive and insulating composite material.

[0013] In one embodiment of this utility model, the frame is provided with a top cover to prevent foreign objects from entering.

[0014] In one embodiment of the present invention, the side of the frame is provided with an inner groove, and a handle is rotatably disposed in the inner groove, with a gap for finger insertion left between the handle and the side wall of the inner groove.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: The stacked natural air-cooled energy storage battery pack described in this utility model significantly reduces cell temperature rise and narrows the temperature difference between adjacent battery modules by setting an independent air-cooling channel structure, eliminating the need for interlayer airflow and achieving zero-energy natural cooling. Furthermore, the combination of the upward-expanding trapezoidal air-cooling channel and the rectangular cross-section increases the heat dissipation area, effectively improving heat exchange efficiency and supporting high-rate continuous charging and discharging. The air inlets and outlets arranged on the same layer ensure that the modules are independently sealed, and dust and moisture are limited to the fault layer. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram of the stacked natural air cooling energy storage battery pack in a preferred embodiment of the present invention; Figure 2 for Figure 1 The diagram shows an exploded structure of a stacked natural air-cooled energy storage battery pack. Figure 3 for Figure 1 The diagram shows the structure of the battery module in the stacked natural air cooling energy storage battery pack. Figure 4 for Figure 3 The diagram shows a cross-sectional view of the battery module. Figure 5 for Figure 3 The diagram shows the structural structure of the battery module frame. Instruction manual illustrations and markings: 1. Base; 2. Battery module; 3. Frame; 4. Battery cell; 5. Heat sink; 6. Support frame; 7. Battery cell storage area; 8. Air cooling channel; 9. Air inlet; 10. Air outlet; 11. Upper socket; 111. Guide positioning block; 12. Lower plug; 13. Inner groove; 14. Handle; 15. Top cover; 16. Embedded groove; 17. Fixing plate. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0018] Reference Figure 1-4As shown, this utility model discloses a stacked natural air-cooled energy storage battery pack, including: a base 1 for supporting the energy storage battery pack; a plurality of battery modules 2, stacked on the base 1, with the positive and negative terminals of adjacent battery modules 2 connected in series; wherein, each battery module 2 includes a frame 3, a plurality of battery cells 4 arranged in series and a heat sink 5; a support frame 6 is inclinedly arranged inside the frame 3, dividing the internal space of the frame 3 into a battery cell storage area 7 and a cooling channel 8; the battery cell storage area 7 is used to accommodate and fix the battery cells 4; the cooling channel 8 is used to guide natural convection air to achieve heat dissipation of the battery cells 4, and its longitudinal section is an upwardly expanding trapezoid, and its transverse section is rectangular; the frame 3 has an air inlet 9 and an air outlet 10 communicating with the cooling channel 8 on both sides, and the heat sink 5 is embedded in the cooling channel 8 and connected to the support frame 6, and contacts the side of the battery cells 4 facing the cooling channel 8.

[0019] Based on this, to ensure more efficient airflow organization, the support frames 6 inside the frames 3 of adjacent battery modules 2 are inclined in the same direction, forming a spiral upward airflow path for the multi-layer air-cooling channels 8, extending the air residence time and enhancing heat exchange. The inclined support frames 6 ensure that the air ducts in this layer still maintain an upward path, extending the air residence time and improving the heat transfer coefficient; at the same time, since the air-cooling channels 8 are not interconnected, heat accumulation is avoided, achieving the dual benefits of "high-efficiency heat exchange + zero heat transfer".

[0020] To further reduce resistance and increase flow rate, the cross-sectional area of ​​the air inlet 9 is smaller than that of the air outlet 10, forming a diffuser duct to reduce airflow resistance and increase flow rate.

[0021] Both the air inlet 9 and the air outlet 10 are composed of several holes, which are one or more combinations of circular, elliptical, elongated, or louvered holes.

[0022] To achieve rapid stacking and electrical connection, the battery module 2 has an upper socket 11 on its top surface and a lower plug 12 on its bottom surface. The upper socket 11 and the lower plug 12 are paired composite connectors, which work together to achieve electrical and mechanical connection between adjacent battery modules 2. The composite connector of the upper socket 11 and the lower plug 12 enables rapid and precise stacking while achieving electrical connection.

[0023] The upper socket 11 and lower plug 12 include a guide positioning block 111 and a connecting terminal. The guide positioning block 111 is used for alignment during stacking, and the connecting terminal is embedded in the guide positioning block 111 for series current conduction. The guide positioning block 111 is aligned before being inserted, ensuring that the connecting terminal and the duct end cover are aligned in one go, shortening the insertion and removal time of a single module; the concealed terminals prevent bumps during handling, maintain the flatness of the interlayer sealing surface, and maintain the integrity of the independent chimney even after long-term use.

[0024] Since the base 1 has both load-bearing and electrical introduction functions, the top surface of the base 1 is equipped with an upper socket 11 that connects to the bottom battery module 2. This eliminates the need for additional copper busbars or cables between the bottom battery module 2 and the outside, leaving only two terminals (positive and negative) exposed to the outside. This reduces the installation space by 30%, shortens wiring time by 50%, and further improves the appearance and safety.

[0025] To increase the heat dissipation area, the heat sink 5 in this embodiment is composed of a substrate and a fin structure, and the fin structure is integrally formed with the substrate, thereby eliminating contact thermal resistance. like Figure 5 As shown, the support frame 6 is also equipped with an embedding groove 16 and a fixing plate 17. The embedding groove 16 is used to embed the battery cell 4, and the fixing plate 17 is used to fix the battery cell 4, realizing the dual functions of heat conduction and insulation. To improve the system protection level, the frame 3 is equipped with a top cover 15 to prevent foreign objects from entering. The embedding groove 16 presses the battery cell 4 tightly against the heat sink 5. The thermally conductive and insulating composite material provides insulation at the same time, eliminating the need for additional insulating partitions between layers and reducing the number of parts. The independent channel design ensures that material aging only affects the current layer, reducing replacement costs.

[0026] The side of the frame 3 is also provided with an inner groove 13, and a handle 14 is rotatably installed in the inner groove 13. A finger insertion gap is left between the handle 14 and the side wall of the inner groove 13, so as to facilitate the handling and maintenance of the module. The handle 14 is pulled out during handling, and the side can be flat after the handle 14 is retracted.

[0027] Based on the above structure, a stacked natural air-cooled energy storage battery pack works as follows: The heat generated by the battery cell 4 is transferred to the heat dissipation plate 5 with fin structure through the thermal pad. In the air-cooling channel 8 formed by the longitudinal and multi-layered inclined support frame 6, air flows in from the air inlet 9, rises after being heated, and is directly discharged from the air outlet 10 on the same layer. At the same time, the back pressure is reduced and the flow rate is increased by the expansion section where the area of ​​the air inlet 9 is smaller than that of the air outlet 10, thereby achieving efficient heat dissipation with zero energy consumption. When stacked, the lower plug 12 of the upper battery module 2 slides into the upper socket 11 of the lower layer along the guide positioning block 111, so that the connection terminal completes electrical contact and bears mechanical load, realizing "plug-in-series and plug-in-fixed". The embedded groove 16 and the fixing plate 17 press the battery cell 4 tightly onto the heat dissipation plate 5 and simultaneously meet the requirements of heat conduction and insulation through thermally conductive insulating materials. The top cover 15 and the handle 14 respectively ensure the cleanliness of the air duct and single-person tool-free operation and maintenance.

[0028] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A stacked natural air cooling energy storage battery pack, characterized in that: include: The base is used to support the energy storage battery pack; Several battery modules are stacked on the base, and the positive and negative terminals of adjacent battery modules are connected in series. Each battery module includes a frame, several battery cells arranged in series, and a heat sink. A support frame is inclined inside the frame, dividing the internal space of the frame into a battery cell storage area and a cooling channel. The battery cell storage area is used to accommodate and fix the battery cells. The cooling channel is used to guide natural convection air to achieve heat dissipation of the battery cells. Its longitudinal section is an upwardly expanding trapezoid, and its transverse section is rectangular. The frame has air inlets and outlets on both sides that communicate with the cooling channel. The heat sink is embedded in the cooling channel and connected to the support frame, and contacts the side of the battery cell facing the cooling channel.

2. The stacked natural air cooling energy storage battery pack according to claim 1, characterized in that: The support frames inside the frames of adjacent battery modules are inclined in the same direction, so that the multi-layer air-cooling channels form a spiral upward airflow path, which prolongs the air residence time and enhances heat exchange.

3. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The cross-sectional area of ​​the air inlet is smaller than that of the air outlet, forming a diffuser duct to reduce airflow resistance and increase airflow velocity.

4. A stacked natural air-cooled energy storage battery pack according to claim 1 or 3, characterized in that: Both the air inlet and the air outlet are composed of several holes, which are one or more combinations of circular, elliptical, elongated, or louvered holes.

5. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The battery module has an upper socket on its top surface and a lower plug on its bottom surface. The upper socket and the lower plug are paired composite connectors, which work together to achieve electrical and mechanical connection between adjacent battery modules.

6. A stacked natural air-cooled energy storage battery pack according to claim 5, characterized in that: The upper socket and the lower socket include guide positioning blocks and connecting terminals. The guide positioning blocks are used for alignment when stacked, and the connecting terminals are embedded in the guide positioning blocks for series conduction of current.

7. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The heat sink includes a substrate and a fin structure, wherein the fin structure is integrally formed with the substrate.

8. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The support frame is provided with an embedding groove and a fixing plate. The embedding groove is used to embed the battery cell, and the fixing plate is used to fix the battery cell.

9. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The frame is equipped with an upper cover to prevent foreign objects from entering.

10. A stacked natural air-cooled energy storage battery pack according to claim 1, characterized in that: The frame has an inner groove on its side, and a handle is rotatably installed in the inner groove. A gap is left between the handle and the side wall of the inner groove for finger insertion.

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