Square aluminum shell battery with high heat dissipation performance

Abstract

This utility model discloses a square aluminum-cased battery with high heat dissipation performance in the field of lithium-ion battery technology. It includes an upper cover plate, an electrode core, and an outer frame. The upper cover plate is provided with a sealing groove, an electrode post, and an insulating pad. The sealing groove and electrode post are located on the outer surface of the upper cover plate, and the insulating pad is located on the inner surface of the upper cover plate. The electrode core includes parallel cells, a heat insulation pad, an electrode tab, and a connecting piece. The connecting piece is connected to the parallel cells via the electrode tab located below. The upper surface of the connecting piece is provided with a groove matching the electrode post. The outer frame is provided with a double-layer composite aluminum-based shell, a heat dissipation frame, and a thermally conductive silicone grease layer. Several micro-groove structures form a cell interface, resulting in a shorter heat conduction path, a larger unit heat dissipation area, significantly reduced structural thermal resistance and battery temperature rise rate. The inorganic carbon material heat dissipation frame replaces traditional metal materials, resulting in higher energy density.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to a square aluminum-cased battery with high heat dissipation performance. Background Technology

[0002] The rapid global demand for clean energy and electrification has led to a continuous expansion of the market share of lithium-ion rechargeable batteries. Among them, square aluminum-cased batteries have gradually become the mainstream choice for power batteries and energy storage batteries due to their advantages such as high energy density, structural stability, and ease of mass production. However, with the continuous improvement of battery energy density and the popularization of fast charging technology, the heat generated by batteries during charging and discharging has increased significantly, especially under high-rate conditions. The internal chemical reactions of the battery intensify, leading to a rapid increase in temperature. If the heat cannot be dissipated in time, it will cause serious safety hazards. A sharp rise in the internal temperature of the battery may trigger a chain reaction such as electrolyte decomposition and separator melting, resulting in the risk of thermal runaway. A sustained high-temperature environment will accelerate the aging of electrode materials, reduce battery cycle life, and lead to a decline in battery performance. However, due to the complex structure of battery components and the unsatisfactory heat dissipation rate, traditional heat dissipation solutions are difficult to adapt to new battery designs such as large-size cells and bipolar structures. They have significant shortcomings in terms of heat dissipation efficiency and lightweighting, making it difficult to achieve both efficient heat dissipation and improved overall battery performance.

[0003] Chinese patent literature discloses a method for transferring heat generated by the tabs or terminals in a battery cell, battery pack, and vehicle (application number: CN202420730185.0). This method utilizes thermally conductive adhesive to more quickly transfer heat to the casing or cover, and ultimately to the external environment, improving heat dissipation at the cell's length and reducing the overall temperature difference. This is beneficial for improving cell performance and extending its lifespan. The aforementioned patent involves filling the battery interior with thermally conductive adhesive to conduct heat to the casing. However, this method suffers from a long heat conduction path, high thermal resistance at the contact surface, and the filler adds extra weight to the battery, reducing energy density.

[0004] A novel thermal management device for automotive lithium batteries (application number: CN202022183451.7) features liquid cooling pipes with inlets and outlets, with the inlet of the upper serpentine liquid cooling pipe located above the outlet of the lower serpentine liquid cooling pipe. By combining liquid cooling with phase change cooling and heat pipe cooling, effective suppression of battery temperature rise is achieved. The aforementioned patent also improves heat dissipation efficiency by adding air-cooled or liquid-cooled pipes outside the casing. However, this method results in increased battery size, more complex manufacturing processes, and increased production costs.

[0005] Therefore, we propose a square aluminum-cased battery with high heat dissipation performance. Utility Model Content

[0006] The purpose of this invention is to provide a square aluminum-cased battery with high heat dissipation performance to solve the battery heat dissipation problem mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a square aluminum-cased battery with high heat dissipation performance, comprising an upper cover plate, an electrode core, and an outer casing frame. The upper cover plate is provided with a sealing groove, an electrode post, and an insulating pad. The sealing groove and the electrode post are disposed on the outer surface of the upper cover plate, and the insulating pad is disposed on the inner surface of the upper cover plate. The electrode core includes parallel cells, a heat insulation pad, an electrode tab, and a connecting piece. The connecting piece is connected to the parallel cells through the electrode tab disposed below. The upper surface of the connecting piece is provided with a groove that matches the electrode post. The outer casing frame is provided with a double-layer composite aluminum-based shell, a heat dissipation frame, and a thermally conductive silicone grease layer. The wide side of the heat dissipation frame is provided with a microgroove structure, and the narrow wide side of the heat dissipation frame is provided with a microgroove structure and a perforated groove structure.

[0008] Preferably, the sealing groove is uniformly filled with sealant, and the sealant forms a sealing layer after curing, so that there is no gap between the upper cover plate and the pole post.

[0009] Preferably, the parallel battery cells are provided in two groups, and the distance between the two groups of parallel battery cells is .-.mm.

[0010] Preferably, the heat dissipation frame has several micro-groove structures on its wide side, and these micro-groove structures form a cell interface.

[0011] Preferably, both sides of the groove are provided with strip-shaped heat dissipation grooves, and the width of the strip-shaped heat dissipation grooves is .-mm.

[0012] Preferably, the connecting piece and the pole are connected by laser welding.

[0013] Preferably, the thermally conductive silicone grease layer is disposed between the heat dissipation frame and the electrode core.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the heat insulation pad can block the heat released by the thermal runaway of adjacent cells, and at the same time assist the heat transfer between the cell and the outer frame; the grooved connecting piece can cope with the heat accumulation effect caused by the increase of current in parallel cells; the wide side of the heat dissipation frame is provided with a microgroove structure, and the narrow wide side of the heat dissipation frame is provided with a microgroove structure and a hole groove structure, forming a multi-level heat dissipation path, shortening the heat conduction path of the battery, and mitigating the risk of battery thermal runaway; the frame is made of high thermal conductivity carbon nanotube material, which has good thermal conductivity and mechanical strength; several microgroove structures form a cell interface, which has a shorter heat conduction path, more unit heat dissipation area, significantly reducing structural thermal resistance and battery temperature rise rate; the inorganic carbon material heat dissipation frame replaces traditional metal materials, which has higher energy density. Attached Figure Description

[0015] Figure 1 This is an isometric side view of a square aluminum-cased battery according to an embodiment of the present invention;

[0016] Figure 2 This is a front view of the connecting piece structure in an embodiment of this utility model;

[0017] Figure 3 This is a front view of the heat dissipation frame structure in an embodiment of this utility model;

[0018] Figure 4 This is a side view of the heat dissipation frame structure in an embodiment of the present utility model;

[0019] Figure 5 This is an isometric side view of a rectangular aluminum-cased battery according to an embodiment of the present invention.

[0020] In the diagram: 1. Top cover plate; 2. Electrode core; 3. Outer shell frame; 11. Sealing groove; 12. Electrode post; 13. Insulating pad; 21. Parallel cell; 22. Heat insulation pad; 23. Electrode tab; 24. Connecting piece; 241. Groove; 242. Strip heat dissipation strip; 31. Double-layer composite aluminum base shell; 32. Heat dissipation frame; 33. Thermal grease layer; 321. Microgroove structure; 322. Cell interface; 323. Hole and groove structure. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-4This utility model provides a technical solution: a square aluminum-cased battery with high heat dissipation performance, including an upper cover plate 1, an electrode core 2, and a housing frame 3. The upper cover plate 1 is provided with a sealing groove 11, an electrode post 12, and an insulating pad 13. The sealing groove 11 and the electrode post 12 are located on the outer surface of the upper cover plate 1, and the insulating pad 13 is located on the inner surface of the upper cover plate 1. The insulating pad 13 has good insulation performance and high temperature resistance, further improving the safety and reliability of the battery. The electrode core 2 includes parallel cells 21, a heat insulation pad 22, an electrode tab 23, and a connecting piece 24. The heat insulation pad 22 can block the heat released by the thermal runaway of adjacent cells and assist in the heat transfer between the cells and the housing frame 3. The connecting piece 24 is connected to the parallel cells 21 through the electrode tab 23 located below. The upper surface of the connecting piece 24 is provided with a groove 241 that matches the electrode post 12. The groove structure of the connecting piece can cope with the heat accumulation caused by the increase of current in the parallel cells. The outer casing 3 is provided with a double-layer composite aluminum-based shell 31, a heat dissipation frame 32, and a thermally conductive silicone grease layer 33. The double-layer composite aluminum-based shell 31 is composed of an inner layer of high thermal conductivity aluminum-based material (thermal conductivity ≥200W / mk) and an outer layer of flame-retardant insulating layer, thereby achieving high thermal conductivity and strong safety, and improving the safety of aluminum-cased batteries. The heat dissipation frame 32 has microgroove structures 321 on its wide side and microgroove structures 321 and perforated groove structures 323 on its narrow wide side, forming a multi-level heat dissipation path, shortening the heat conduction path of the battery, and mitigating the risk of battery thermal runaway. The frame 32 is made of high thermal conductivity carbon nanotube material, which has good thermal conductivity and mechanical strength. Several microgroove structures 321 form a cell interface 322, which also has a shorter heat conduction path, more unit heat dissipation area, and significantly reduces structural thermal resistance and battery temperature rise rate. The inorganic carbon material heat dissipation frame replaces traditional metal materials, which has a higher energy density.

[0023] Reference Figure 5 As shown, the double-sided upper cover plate 1, the pole post 12 is connected to the connecting piece 24 of the two side pole cores 2. The internal structure design of the pole core 2 and the outer shell frame 3 is basically the same as above. The technical solution provided by this utility model is also applicable to rectangular aluminum shell batteries with double-sided pole post structure.

[0024] Reference embodiment: The sealing groove 11 is uniformly filled with sealant. After the sealant cures, a sealing layer is formed, so that the upper cover plate 1 and the pole post 12 are connected without gaps.

[0025] Reference embodiment: Two sets of parallel cells 21 are provided, and the distance between the two sets of parallel cells 21 is 0.2-0.7mm.

[0026] Reference embodiment: Several microgroove structures 321 are provided on the wide side of the heat dissipation frame 32. Several microgroove structures 321 form a cell interface 322. More heat conduction channels help improve the heat dissipation efficiency per unit area.

[0027] Reference embodiment: Both sides of the groove 241 are provided with strip-shaped heat dissipation grooves 242, the groove width of which is 0.5-1mm. The effective heat dissipation area of ​​the connecting piece 24 is increased, which can effectively alleviate the heat accumulation effect caused by the increase of current in the parallel battery cell 21.

[0028] Reference embodiment: The connecting piece 24 and the pole post 12 are connected by laser welding.

[0029] Reference embodiment: The thermally conductive silicone grease layer 33 is disposed between the heat dissipation frame 32 and the electrode core 2 to ensure close contact and improve the heat conduction efficiency between the surface of the heat dissipation frame 32 and the electrode core 2.

[0030] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A square aluminum-cased battery with high heat dissipation performance, comprising a top cover (1), an electrode core (2), and a casing frame (3), characterized in that: The upper cover plate (1) is provided with a sealing groove (11), a pole post (12), and an insulating pad (13). The sealing groove (11) and the pole post (12) are provided on the outer surface of the upper cover plate (1), and the insulating pad (13) is provided on the inner surface of the upper cover plate (1). The pole core (2) includes a parallel cell (21), a heat insulation pad (22), a tab (23), and a connecting piece (24). The connecting piece (24) is connected to the parallel cell (21) through the tab (23) provided below. The upper surface of the connecting piece (24) is provided with a groove (241) that matches the pole post (12). The outer shell frame (3) is provided with a double-layer composite aluminum base shell (31), a heat dissipation frame (32), and a thermally conductive silicone grease layer (33). The wide side of the heat dissipation frame (32) is provided with a microgroove structure (321), and the narrow wide side of the heat dissipation frame (32) is provided with a microgroove structure (321) and a hole groove structure (323).

2. The square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: The sealing groove (11) is filled with sealant evenly. After the sealant is cured, a sealing layer is formed, so that the upper cover plate (1) and the pole post (12) are connected without gaps.

3. The square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: The parallel battery cell (21) is provided in two sets, and the distance between the two sets of parallel battery cells (21) is 0.2-0.7mm.

4. A square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: The heat dissipation frame (32) has several micro-groove structures (321) on its wide side, and the micro-groove structures (321) form a cell interface (322).

5. A square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: Both sides of the groove (241) are provided with strip-shaped heat dissipation grooves (242), and the width of the strip-shaped heat dissipation grooves (242) is 0.5-1mm.

6. A square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: The connecting piece (24) and the pole (12) are connected by laser welding.

7. A square aluminum-cased battery with high heat dissipation performance according to claim 1, characterized in that: The thermally conductive silicone grease layer (33) is disposed between the heat dissipation frame (32) and the electrode core (2).

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