Air-cooled battery pack with efficient heat management

Abstract

The utility model relates to an efficient heat management air-cooled battery pack in the field of battery pack heat dissipation, which comprises a battery box cover, a battery module, a battery box body, an explosion-proof valve, an air-cooled system and a module side cover, and the air-cooled system is externally arranged below the battery box body; and high-enthalpy-value phase-change materials are arranged at battery tabs on two sides of the battery module. The external air cooling assembly ensures sufficient air inlet amount, the high-enthalpy-value phase change material assists in heat absorption, and the local high-temperature risk is reduced; the IP67-level sealing structure prevents oxygen from entering, and combustion aggravation after thermal runaway is avoided; and the high-enthalpy phase change material effectively shares the heat dissipation load, so that the temperature balance of the battery pack in a high-power working state is ensured, and the service life of the battery is prolonged.

Description

An air-cooled battery pack with high-efficiency thermal management Technical Field

[0001] This utility model relates to the field of battery pack heat dissipation, and in particular to an air-cooled battery pack with high-efficiency thermal management. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the demand for high-power charging and discharging of power battery packs is increasing, which places higher demands on the heat dissipation capacity and safety of battery thermal management systems. Traditional air-cooling systems, as one of the mainstream technologies for battery thermal management, are widely used due to their simple structure and low cost, but they still have significant technical limitations in practical applications.

[0003] In existing technologies, traditional air-cooling systems mostly adopt an internal design. Their air intake channels are limited by the internal space layout of the battery pack, resulting in insufficient air intake and uneven airflow distribution. Under high-power charging and discharging conditions, the heat generation rate inside the battery module increases significantly. The limited heat dissipation capacity of the internal air-cooling system is difficult to match the rate of heat accumulation, which can easily cause overheating in individual battery cells or local areas of the module.

[0004] Further analysis revealed that the main technical problems of existing air-cooled systems are as follows:

[0005] 1. Insufficient heat dissipation capacity and temperature uniformity: The limited space of the built-in air duct leads to insufficient air supply, and the airflow path is difficult to cover the key heat-generating areas of the battery module, such as the tab connection, making it difficult to meet the requirements for heat dissipation efficiency and temperature uniformity under high power conditions.

[0006] 2. Lack of thermal runaway protection mechanism: Traditional air-cooled systems rely on open ventilation design, and the enclosure is not well sealed, which cannot prevent oxygen from contacting combustibles during thermal runaway, leading to the expansion of secondary hazards;

[0007] 3. Limited system reliability: Local overheating and heat accumulation problems persist, accelerating battery aging and reducing the overall lifespan of the system, affecting the long-term operational stability of the battery pack. Summary of the Invention

[0008] The purpose of this invention is to address the problem of insufficient heat dissipation in the existing air-cooled systems by proposing an air-cooled battery pack with high-efficiency thermal management.

[0009] A high-efficiency thermal management air-cooled battery pack includes a battery box cover, a battery module, a battery box body, an explosion-proof valve, an air-cooling system, and a module side cover, wherein the air-cooling system is externally located below the battery box body;

[0010] High enthalpy phase change material is arranged at the battery tabs on both sides of the battery module.

[0011] Furthermore, an efficient thermal management air-cooled battery pack, wherein the air-cooling system includes a radiator assembly, a cooling fan assembly, and a radiator enclosure;

[0012] The radiator assembly and the radiator enclosure together form a closed air duct.

[0013] The radiator assembly and the cooling fan assembly are closely fitted together.

[0014] Furthermore, in a high-efficiency thermal management air-cooled battery pack, the battery module and the heat sink assembly are connected and fixed by a high thermal conductivity sealing structural adhesive.

[0015] Furthermore, in an efficient thermal management air-cooled battery pack, the high enthalpy phase change material is fixed by pre-compressed foam in the module side cover and battery tabs.

[0016] Furthermore, a high-efficiency thermal management air-cooled battery pack, wherein the air-cooling system has a convex structure, through which the air-cooling system passes through the opening of the battery box and cooperates with the concave structure of the battery module.

[0017] Furthermore, in a high-efficiency thermal management air-cooled battery pack, the air-cooling system fills the gaps through the openings in the battery housing with sealant.

[0018] Furthermore, an efficient thermal management air-cooled battery pack is provided, wherein the battery housing is fixed to the air-cooling system by bolts.

[0019] Furthermore, in a high-efficiency thermal management air-cooled battery pack, the nuts at the bolt connections are blind-hole sealed press-fit nuts.

[0020] Furthermore, in a high-efficiency thermal management air-cooled battery pack, the battery box cover and battery box body are provided with sealing gaskets.

[0021] The beneficial effects of this utility model are:

[0022] 1. Improved heat dissipation: External air-cooling components ensure sufficient airflow, and high-enthalpy phase change materials assist in heat absorption, reducing the risk of localized high temperatures;

[0023] 2. Reduce the risk of thermal runaway: Efficient heat dissipation and temperature balance design reduce the risk of thermal runaway caused by local overheating;

[0024] 3. Enhanced safety: The IP67-rated sealing structure prevents oxygen from entering, avoiding escalation of combustion after thermal runaway;

[0025] 4. Improved system stability: High enthalpy phase change materials effectively share the heat dissipation load, ensuring the temperature uniformity of the battery pack under high power operation and extending battery life. Attached Figure Description

[0026] Figure 1 is an exploded view of an air-cooled battery pack with efficient thermal management.

[0027] Figure 2 is a schematic diagram of an externally mounted air-cooling system.

[0028] Figure 3 is a schematic diagram of the air-cooled system.

[0029] Figure 4 is a schematic diagram of the airflow direction of the air-cooled system.

[0030] Figure 5 is a schematic diagram of the structure of a high enthalpy phase change material.

[0031] Figure 6 is a cross-sectional view of the convex structure of the air-cooled system.

[0032] In the diagram: 1-Battery box cover, 2-Sealing gasket, 3-Battery module, 4-Battery box body, 5-Explosion-proof valve, 6-Air cooling system, 7-Module side cover, 8-Battery tab, 9-High enthalpy phase change material, 10-Foam, 11-High thermal conductivity sealing structural adhesive, 12-Sealing adhesive, 13-Air inlet, 14-Air outlet;

[0033] 61-Radiator assembly, 62-Radiator fan assembly, 63-Radiator enclosure. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0035] As shown in Figure 1, an efficient thermal management air-cooled battery pack includes a battery box cover 1, a battery module 3, a battery box body 4, an explosion-proof valve 5, an air-cooling system 6, and a module side cover 7. The air-cooling system 6 is externally located below the battery box body 4.

[0036] High enthalpy phase change material 9 is arranged at the battery tabs 8 on both sides of the battery module 3.

[0037] As shown in Figures 2-4, a high-efficiency thermal management air-cooled battery pack, wherein the air-cooling system 6 includes a radiator assembly 61, a cooling fan assembly 62, and a radiator enclosure 63.

[0038] The radiator assembly 61 and the radiator enclosure 63 together form a closed air duct.

[0039] The radiator assembly 61 and the cooling fan assembly 62 are closely fitted together.

[0040] As shown in Figure 5, in an air-cooled battery pack with high thermal management, the high enthalpy phase change material 9 is fixed by the module side cover 7, the pre-compressed foam 10, and the battery tabs 8.

[0041] As shown in Figure 6, in a high-efficiency thermal management air-cooled battery pack, the battery module 3 and the heat sink assembly 61 are connected and fixed by a high thermal conductivity sealing structural adhesive 11.

[0042] The air-cooling system 6 has a convex structure, which passes through the opening of the battery box 4 and cooperates with the concave structure of the battery module 3.

[0043] The gaps in the openings of the air-cooling system 6 through the battery box 4 are filled with sealant 12.

[0044] The battery housing 4 is fixed to the air-cooling system 6 by bolts.

[0045] The nuts at the bolted connections are blind hole sealed press-fit nuts.

[0046] The battery box cover 1 and the battery box body 4 are provided with sealing gaskets 2.

[0047] A high-efficiency thermal management air-cooled battery pack, the principle of which is as follows:

[0048] The battery pack adopts an external air-cooling system 6 to ensure sufficient air intake, improve the overall cooling efficiency of the battery system, and avoid local overheating that could lead to safety risks. The heat dissipation fan assembly 61 is closely fitted with the heat sink assembly 62 to ensure that the fan can promptly remove the heat transferred from the battery to the heat sink assembly 62.

[0049] The high enthalpy phase change material 9 is fixed by the module side cover 7, the pre-pressed foam 10, and the battery tabs 8, so that the high enthalpy phase change material 9 and the battery tabs 8 are in full contact. This ensures that when the battery is charged and discharged at high power, the heat generated by the battery is fully absorbed by the high enthalpy phase change material 9, effectively sharing the heat dissipation load of the air-cooling system 6 and improving the uniformity of battery temperature.

[0050] The air-cooling system 6 has a convex structure. The air-cooling system 6 passes through the opening of the battery box 4 through the convex structure and cooperates with the concave structure of the battery module 3. The battery module 3 and the heat sink assembly 61 are connected and fixed by a high thermal conductivity sealing adhesive 11, so that the battery module 3 is in direct contact with the air-cooling system 6, ensuring that the heat of the battery can be quickly and effectively conducted to the heat sink assembly 61 and carried away by the air-cooling system in time.

[0051] The directions of the air inlet 13 and the air outlet 14 are shown in Figures 2 and 4. Since the air-cooling system 6 is external, the battery pack housing does not need to be equipped with air inlets and outlets 14. The gap between the air-cooling system 6 and the opening of the battery housing 4 is filled with sealant 12. The battery housing 4 and the air-cooling system 6 are fixed with bolts. The nuts at the bolt connection are blind hole sealed press-fit nuts. The battery cover 1 and the battery housing 4 are equipped with sealing gaskets 2. The protection level reaches IP67. In the event of thermal runaway, it can effectively prevent external oxygen from entering, prevent the fire from intensifying, and improve battery safety.

[0052] 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 illustrative of the principles of this 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 claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency thermal management air-cooled battery pack, comprising a battery box cover (1), a battery module (3), a battery box body (4), an explosion-proof valve (5), an air-cooling system (6), and a module side cover (7), characterized in that, The air-cooling system (6) is located outside the battery box (4); high enthalpy phase change material (9) is arranged at the battery tabs (8) on both sides of the battery module (3).

2. The air-cooled battery pack with high-efficiency thermal management as described in claim 1, characterized in that, The air-cooled system (6) includes a radiator assembly (61), a cooling fan assembly (62), and a radiator enclosure (63); the radiator assembly (61) and the radiator enclosure (63) together form a closed air duct; the radiator assembly (61) and the cooling fan assembly (62) are tightly fitted together.

3. The air-cooled battery pack with high-efficiency thermal management as described in claim 2, characterized in that, The battery module (3) and the heat dissipation fan assembly (62) are all connected and fixed by a high thermal conductivity sealing structural adhesive (11).

4. The air-cooled battery pack with high-efficiency thermal management as described in claim 1, characterized in that, The high enthalpy phase change material (9) is fixed by the module side cover (7), the pre-compressed foam (10), and the battery tabs (8).

5. The air-cooled battery pack with high-efficiency thermal management as described in claim 1, characterized in that, The air-cooling system (6) has a convex structure. The air-cooling system (6) passes through the opening of the battery box (4) through the convex structure and cooperates with the concave structure of the battery module (3).

6. The air-cooled battery pack with high-efficiency thermal management as described in claim 5, characterized in that, The air-cooling system (6) passes through the opening in the battery box (4) and the gap is filled with sealant (12).

7. The air-cooled battery pack with high-efficiency thermal management as described in claim 1, characterized in that, The battery box (4) is fixed to the air-cooling system (6) by bolts.

8. The air-cooled battery pack with high-efficiency thermal management as described in claim 7, characterized in that, The nuts at the bolted connections are blind hole sealed press-fit nuts.

9. The air-cooled battery pack with high-efficiency thermal management as described in claim 1, characterized in that, The battery box cover (1) and battery box body (4) are provided with sealing gaskets (2).

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