Bottom plate of lower shell of battery pack

Abstract

The utility model relates to the field of batteries, in particular to a bottom plate of a lower shell of a battery pack. The bottom plate of the lower shell of the battery pack comprises a lower plate, an upper plate is arranged above the lower plate, a honeycomb core is arranged between the lower plate and the upper plate, and a cooling pipe is mounted on the honeycomb core. The battery pack lower shell bottom plate provided by the utility model has the advantages of simple structure and low manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a bottom plate of a battery pack lower housing. Background Art

[0002] The main power source of new energy vehicles is the battery pack. The battery pack includes a lower housing, battery cells, an upper housing, and auxiliary designs such as gaskets and breather valves. Among them, the lower housing is the main load-bearing structure. The structure of the lower housing needs to be thermally managed, and the large-area water-cooling type is the most common. The bottom plates of existing large-area water-cooling type aluminum alloy welded lower housings are respectively of an extruded profile + buffer foam + water-cooling plate structure and a steel guard plate + buffer foam + water-cooling plate structure.

[0003] For example, the patent document with the publication number CN214254595U discloses a battery pack housing and a battery pack. The battery pack housing includes: a lower housing; a liquid cooling plate, which is installed in the lower housing. The liquid cooling plate is provided with a cooling flow channel and an upper avoidance groove spaced apart from the cooling flow channel, and the upper avoidance groove opens downward; a lower guard plate assembly, which is installed at the bottom of the lower housing and supports below the liquid cooling plate, and the lower guard plate assembly has a buffer boss protruding upward.

[0004] Again, the patent document with the publication number CN117638371 A discloses a new energy battery pack integrated structure, including a battery pack integrated structure main body. An aluminum alloy lower housing is provided on the battery pack integrated structure main body, and a high-strength steel bottom guard plate is provided below the aluminum alloy lower housing. A liquid cooling plate is connected to the upper end of the high-strength steel bottom guard plate. A structural adhesive integrating the bottom plate and the cold plate is applied between the high-strength steel bottom guard plate and the liquid cooling plate, and a thermal conductive gel is also applied above the liquid cooling plate.

[0005] However, in the above technologies, the bottom plates are all composed of upper and lower guard plates, a buffer layer, and a water-cooling plate, and the water-cooling plate is used to cool the battery pack. However, the water-cooling plate is expensive, resulting in high production costs.

[0006] Therefore, a bottom plate of a battery pack lower housing is proposed to solve the above technical problems. Content of the Utility Model

[0007] To solve the above technical problems, the purpose of the utility model is to provide a bottom plate of a battery pack lower housing, which has the advantages of simple structure and low manufacturing cost.

[0008] The technical solution adopted by the utility model to solve the problem is: a bottom plate of a battery pack lower housing, including: a lower plate, an upper plate is provided above the lower plate, a honeycomb core is provided between the lower plate and the upper plate, and a cooling pipe is provided on the honeycomb core, and the cooling pipe is in a serpentine shape.

[0009] As a further improvement of the above technical solution, a groove is formed at the top of the honeycomb core, and the cooling pipe is embedded and installed in the groove.

[0010] As a further improvement of the above technical solution, both ends of the cooling pipe are connection ends, an avoidance hole is provided on the upper plate, and the connection end penetrates through the avoidance hole from bottom to top.

[0011] As a further improvement of the above technical solution, a frame is provided at the edge of the honeycomb core.

[0012] As a further improvement of the above technical solution, the lower plate and the upper plate extend toward the side of the honeycomb core and form installation positions.

[0013] As a further improvement of the above technical solution, the frame of the lower housing of the battery pack is fixed to the lower plate and the upper plate by friction stir spot welding with piercing.

[0014] As a further improvement of the above technical solution, the cross-sectional shape of the honeycomb core is composed of several polygons.

[0015] As a further improvement of the above technical solution, the thickness direction of the honeycomb core is perpendicular to the plane where the lower plate is located.

[0016] The beneficial effect of the present utility model is that a cooling pipe is used to replace the traditional liquid cooling plate to cool the battery pack, thereby effectively reducing the production cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further explained below with reference to the drawings and specific embodiments.

[0018] Figure 1 is a schematic structural diagram of a preferred embodiment of the present utility model;

[0019] Figure 2 is Figure 1 the exploded view shown;

[0020] Figure 3 is a schematic cross-sectional structural diagram of the present utility model;

[0021] Figure 4 is Figure 3 the enlarged structural diagram of part A shown;

[0022] Figure 5 is a schematic connection diagram of the present utility model and the frame of the lower housing of the battery pack.

[0023] In the figure: 1, lower plate; 2, upper plate; 21, avoidance hole; 3, honeycomb core; 31, groove; 32, frame; 4, cooling pipe; 41, connection end; 5, installation position; 6, frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present utility model.

[0026] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the recited number, and above, below, within, etc. are understood as including the recited number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0028] Refer to Figures 1 to 5 , a bottom plate of a battery pack lower housing, comprising: a lower plate 1, an upper plate 2 is provided above the lower plate 1, a honeycomb core 3 is provided between the lower plate 1 and the upper plate 2, a cooling pipe 4 is provided on the honeycomb core 3, the cooling pipe 4 is in a serpentine shape, and the cross-section of the cooling pipe 4 is a rounded rectangle. By circulating water or coolant through the cooling pipe 4, the temperature of the battery pack can be reduced. Compared with the liquid cooling plate of the prior art, the production cost can be effectively reduced.

[0029] As a preferred embodiment, a groove 31 is formed at the top of the honeycomb core 3, and the cooling pipe 4 is embedded and installed in the groove 31. This can ensure the horizontal top of the honeycomb core 3, thus not affecting the installation of the upper plate 2.

[0030] As a preferred embodiment, both ends of the cooling pipe 4 are connection ends 41, and an avoidance hole 21 is provided on the upper plate 2. The connection end 41 penetrates through the avoidance hole 21 from bottom to top. The external water circulation device is connected by using the connection end 41, so as to realize water cooling by using the cooling pipe 4.

[0031] As a preferred embodiment, a frame 32 is provided at the edge of the honeycomb core 3. The frame 32 can be used to position and fix the honeycomb core 3.

[0032] As a preferred embodiment, the lower plate 1 and the upper plate 2 extend toward one side of the honeycomb core 3 and form mounting positions 5. When connected to the lower housing of the battery pack, the border 6 of the lower housing of the battery pack extends into the mounting positions 5 for welding, which can ensure stable welding.

[0033] As a preferred embodiment, the border 6 of the lower housing of the battery pack is fixed to the lower plate 1 and the upper plate 2 by friction stir spot welding. Friction stir welding refers to the process in which heat is generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials to be welded. When the welding tool moves forward along the welding interface, the plasticized materials flow from the front of the welding tool to the rear under the rotational friction force of the welding tool and form a dense solid-phase weld under the extrusion of the welding tool. During welding, the upper plate 2 pierces downward through the mounting positions 5, the border 6, and the lower plate 1 in sequence. Compared with the left-right structure welding in the prior art, the connection is more stable.

[0034] As a preferred embodiment, the cross-sectional shape of the honeycomb core 3 is composed of a plurality of polygons.

[0035] As a preferred embodiment, the thickness direction of the honeycomb core 3 is perpendicular to the plane where the lower plate 1 is located.

[0036] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A battery pack lower shell bottom plate, characterized in that: include: A lower plate (1), an upper plate (2) is arranged above the lower plate (1), a honeycomb core (3) is arranged between the lower plate (1) and the upper plate (2), and a cooling pipe (4) is arranged on the honeycomb core (3); A groove (31) is provided on the top of the honeycomb core (3), and the cooling pipe (4) is embedded and installed in the groove (31).

2. A battery pack lower shell bottom plate as claimed in claim 1, characterized in that: Both ends of the cooling pipe (4) are connection ends (41), an avoidance hole (21) is provided on the upper plate (2), and the connection end (41) passes through the avoidance hole (21) from bottom to top.

3. A battery pack lower shell bottom plate as claimed in claim 1, characterized in that: A frame (32) is provided at the edge of the honeycomb core (3).

4. A battery pack lower shell bottom plate according to any one of claims 1 to 3, characterized in that: The lower plate (1) and the upper plate (2) extend toward one side of the honeycomb core (3) and form a mounting position (5).

5. A battery pack lower shell bottom plate as claimed in claim 4, characterized in that: The frame (6) of the lower shell of the battery pack is fixed to the lower plate (1) and the upper plate (2) by puncture stir friction welding.

6. A battery pack lower shell bottom plate as claimed in claim 1, characterized in that: The cross-sectional shape of the honeycomb core (3) is composed of a number of polygons.

7. A battery pack lower shell bottom plate as claimed in claim 1, characterized in that: The thickness direction of the honeycomb core (3) is perpendicular to the plane where the lower plate (1) is located.

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