Battery pack box body

Abstract

The utility model provides a battery pack box body, and particularly relates to the technical field of new energy automobile battery packs. The battery pack box body comprises a cover plate and a box body, wherein the cover plate comprises a main plate and layer sealing plates arranged at the top and the bottom of the main plate; a plurality of through holes in a honeycomb array are formed in the surface of the main board at equal intervals in the thickness direction of the main board. The box body is of a cuboid structure with an opening in the top, a cavity interlayer is arranged at the bottom of a bottom plate of the box body, and a liquid cooling pipe is laid in the cavity interlayer and tightly attached to the bottom plate; the top of the bottom plate is provided with a cross-shaped bracket matched with a groove in the bottom of the battery module; and the cover plate and the box body are fixed through a connecting lug plate. According to the structure, the honeycomb array hollow main body is arranged in the cover plate made of the SMC composite material, so that the mechanical strength is ensured, the light weight of the battery pack is realized, and the purpose of cooling the battery pack in the box body is effectively realized on the premise of ensuring the overall sealing performance of the box body through the arrangement of the liquid cooling pipe.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle battery pack technology, specifically to a battery pack housing. Background Technology

[0002] With the rapid development of electric vehicles and energy storage technologies, lightweighting, heat dissipation, and sealing reliability of battery pack enclosures have become key technological challenges. Existing technologies suffer from the following problems: Firstly, traditional metal top covers are heavy, dragging down the energy density of the battery pack, while conventional SMC material top covers are limited by molding processes, making it difficult to achieve complex hollow structures and limiting the potential for lightweighting improvements. Secondly, natural heat dissipation solutions cannot meet the heat dissipation requirements of high-rate fast charging, and traditional welding processes result in numerous seams in the enclosure, easily affecting sealing performance. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a battery pack housing, the specific technical solution of which is as follows:

[0004] A battery pack housing includes a cover plate and a housing. The cover plate includes a main board and sealing plates disposed on the top and bottom of the main board. The main board has a plurality of through holes arranged in a honeycomb array at equal intervals along its thickness direction. The housing is a cuboid structure with an open top. A cavity interlayer is provided at the bottom of the bottom plate of the housing, and a liquid cooling pipe is laid in close contact with the bottom plate inside the cavity interlayer. A cross bracket adapted to the bottom groove of the battery module is provided on the top of the bottom plate. The cover plate and the housing are fixed together by connecting lugs.

[0005] Preferably, the inlet of the liquid cooling pipe is connected to the outlet of the cooling water pump; the outlet of the liquid cooling pipe is connected to the inlet of the radiator; and the outlet of the radiator is connected to the inlet of the cooling water pump.

[0006] Preferably, EPDM sealing rings are provided at the flange connections of both the inlet and outlet.

[0007] Preferably, a sealing ring is provided on the contact surface between the cover plate and the box body.

[0008] Preferably, the cover plate is made of SMC composite material and is formed by layer-by-layer deposition using 3D printing technology.

[0009] More preferably, the liquid cooling pipe is made of aluminum alloy.

[0010] More preferably, the housing is made of extruded aluminum alloy.

[0011] The beneficial effects of this utility model are:

[0012] 1. The cover plate of this utility model is made of SMC composite material and is formed by layer-by-layer deposition using 3D printing technology. Several through holes in a honeycomb array are evenly arranged on the main body of the cover plate, which ensures the strength, heat resistance and corrosion resistance of the cover plate while effectively reducing the overall weight of the battery pack box.

[0013] 2. This utility model uses an aluminum alloy extruded box body and installs liquid cooling pipes in a separately set cavity interlayer. The liquid cooling pipes are completely embedded in the closed structure, which effectively protects the liquid cooling pipes. In addition, the liquid cooling pipes are made of aluminum alloy material with high thermal conductivity, which realizes rapid heat exchange and improves the cooling and heat dissipation efficiency.

[0014] 3. This utility model provides EPDM sealing rings at the flange connections of the inlet and outlet, and sealing rings at the contact surfaces of the cover and the housing, further ensuring the sealing performance of the battery pack housing. Attached Figure Description

[0015] The accompanying drawings constituting this utility model are provided to further understand this application and do not constitute an undue limitation on this application.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the cover plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the box body of this utility model;

[0019] In the diagram, 1-cover plate; 2-box body; 3-through hole; 4-connecting ear plate; 5-liquid cooling pipe; 6-liquid inlet; 7-liquid outlet; 8-cross bracket. Detailed Implementation

[0020] The specific implementation of a battery pack housing provided by this utility model will be further described in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1-3 As shown, a battery pack housing for installing batteries in new energy vehicles includes a cover plate 1 and a cuboid structure housing 2 with a top opening. The cover plate 1 and the housing 2 are fixed together by bolt holes on a connecting lug plate 4.

[0022] Specifically, the cover plate 1 consists of three layers from top to bottom, including a main board and sealing plates set at the top and bottom of the main board; preferably, in order to reduce the overall weight of the battery pack box and avoid dragging down the energy density of the battery pack due to the excessive weight of the battery pack box, the surface of the main board is provided with a number of through holes 3 arranged in a honeycomb array at equal intervals along its thickness direction, and then the two ends of the through holes 3 are sealed by the upper and lower sealing plates.

[0023] Preferably, the bottom plate of the housing 2 is provided with a cavity interlayer. In order to dissipate heat and cool the battery pack inside the housing without affecting its internal sealing and causing problems such as battery moisture or dust accumulation, liquid cooling pipes 5 are laid in the cavity interlayer of this utility model, which is closely attached to the bottom plate of the housing 2. The liquid cooling pipes 5 can be laid in a serpentine or ring-shaped distribution. They only need to be laid evenly on the bottom of the bottom plate. The laying method of the liquid cooling pipes 5 is not further limited here.

[0024] Preferably, the bottom plate of the housing 2 is provided with a cross bracket 8 that matches the bottom groove of the battery module, which is beneficial for fixing the battery module in the housing and can also enhance the overall rigidity of the housing 2.

[0025] Preferably, the inlet 6 of the liquid cooling pipe 5 is connected to the outlet of the cooling water pump; the outlet 7 of the liquid cooling pipe 5 is connected to the inlet of the radiator; and the outlet of the radiator is connected to the inlet of the cooling water pump, thereby realizing the circulation of cooling water and better achieving the cooling and heat dissipation function of the battery pack casing. It is worth noting that the liquid cooling system can also be linked with the BMS system to reasonably monitor the battery module temperature and make appropriate adjustments, achieving automatic control.

[0026] To ensure the overall sealing performance of the battery pack housing, prevent coolant leakage during connection, and ensure the safe operation of the battery pack in complex environments, EPDM sealing rings are provided at the flange connections of the inlet 6 and outlet 7; a sealing ring is also provided on the contact surface between the cover plate 1 and the housing 2.

[0027] Preferably, the cover plate 1 of this utility model is made of SMC composite material that is sealed, waterproof, corrosion-resistant, anti-theft, and has a long service life, and is formed by layer-by-layer deposition using 3D printing technology, wherein the printing temperature is 180-200℃.

[0028] More preferably, for better heat dissipation, the liquid cooling pipe 5 is made of aluminum alloy material with high thermal conductivity.

[0029] More preferably, the housing is made of extruded aluminum alloy.

[0030] Example:

[0031] In this embodiment, the cover plate 1 is formed by layering SMC sheets (30% glass fiber content) using 3D printing equipment at a printing temperature of 180-200℃ and a layer thickness of 0.2mm. The total thickness of the cover plate 1 is 4.5mm, and the thickness of the cover plate is 1mm. The through holes 3 are 2.5mm high, 10-20mm in diameter, and spaced 25mm apart in a honeycomb array. The housing 2 is made of 6061-T6 aluminum alloy extrusion, with dimensions of 2000mm×1500mm×180mm. The liquid cooling pipe 5 is made of aluminum alloy with an outer diameter of 8mm and a wall thickness of 1mm. The cross bracket 8 is 50mm high and occupies 30% of the total depth of the housing 2. The cavity interlayer thickness is 10mm.

[0032] After weighing, the total weight of the battery pack casing in this embodiment is approximately 54 kg, which is about 8.5% lighter than a pure aluminum alloy casing of the same size (approximately 59 kg).

[0033] In summary, this utility model features a simple structure and convenient installation. The cover plate is made of SMC composite material using 3D printing technology, which is used to build up the layers in one piece. A honeycomb array of through holes is evenly arranged on the cover plate, ensuring its strength, heat resistance, and corrosion resistance while effectively reducing the overall weight of the battery pack casing. The casing is made of extruded aluminum alloy, and liquid cooling pipes are installed in a separately designed cavity. The sealed structure completely embeds the liquid cooling pipes, effectively protecting them. Furthermore, the liquid cooling pipes are made of highly thermally conductive aluminum alloy, enabling rapid heat exchange and improving cooling efficiency while ensuring the overall sealing performance of the casing and preventing coolant leakage.

[0034] In this utility model, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this utility model and do not specifically refer to any part or element of this utility model; they should not be construed as limiting this utility model. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and they should not be construed as limiting this utility model.

[0035] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A battery pack housing, comprising a cover and a housing, characterized in that, The cover plate includes a main board and a sealing plate disposed on the top and bottom of the main board; the surface of the main board is provided with a plurality of through holes arranged in a honeycomb array at equal intervals along its thickness direction; The enclosure is a cuboid structure with an open top. The bottom plate of the enclosure has a cavity layer, and liquid cooling pipes are laid in close contact with the bottom plate inside the cavity layer. The top of the bottom plate has a cross bracket that matches the bottom groove of the battery module. The cover plate is fixed to the enclosure by connecting lugs.

2. The battery pack housing according to claim 1, characterized in that, The inlet of the liquid cooling pipe is connected to the outlet of the cooling water pump; the outlet of the liquid cooling pipe is connected to the inlet of the radiator; and the outlet of the radiator is connected to the inlet of the cooling water pump.

3. The battery pack housing according to claim 2, characterized in that, Both the inlet and outlet flanges are equipped with EPDM sealing rings.

4. The battery pack housing according to claim 1, characterized in that, A sealing ring is provided on the contact surface between the cover plate and the box body.

5. The battery pack housing according to claim 1, characterized in that, The cover plate is made of SMC composite material and is formed by layer-by-layer deposition using 3D printing technology.

6. The battery pack housing according to claim 2, characterized in that, The liquid cooling pipe is made of aluminum alloy.

7. The battery pack housing according to claim 1, characterized in that, The box body is made of extruded aluminum alloy.

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