Integrated bottom plate structure of battery pack lower shell

Abstract

The utility model relates to the field of batteries, in particular to an integrated bottom plate structure of a lower shell of a battery pack, which comprises a lower plate, a liquid cooling plate is arranged above the lower plate, a honeycomb core is arranged between the lower plate and the liquid cooling plate, the liquid cooling plate comprises a first plate body and a second plate body, bulges are formed on the second plate body, and the bulges are arranged on the lower plate body. And a cooling liquid flowing channel is formed between the bulge and the first plate body. According to the integrated bottom plate structure of the lower shell of the battery pack, the liquid cooling plate and the honeycomb plate are integrated, so that the integrated bottom plate structure has the advantages of simple structure and light weight.

Description

Technical Field

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

[0002] The main power source of new energy vehicles comes from the battery pack. The battery pack includes the lower shell, battery cells, upper shell, and auxiliary designs such as sealing gaskets and breathable valves. The lower shell is the main load-bearing structure.

[0003] The lower shell structure needs to be thermally managed, and the large-surface water-cooled type is the most common. The existing large-surface water-cooled aluminum alloy welded lower shell bottom plates have extruded profile + buffer foam + water-cooled plate structure and steel guard plate + buffer foam + water-cooled plate structure.

[0004] For example, the patent document with publication number CN214254595U discloses a battery pack housing and a battery pack, wherein the battery pack housing comprises: a lower housing; a liquid cooling plate, the liquid cooling plate is installed in the lower housing, the liquid cooling plate is provided with a cooling channel and an upper avoidance groove spaced from the cooling channel, the upper avoidance groove is open downward; a lower guard plate assembly, the lower guard plate assembly is installed at the bottom of the lower housing and supported below the liquid cooling plate, the lower guard plate assembly has an upwardly protruding buffer boss, the buffer boss is directly opposite to the upper avoidance groove in the up-down direction and is staggered from the cooling channel, and a buffer member is provided in the upper avoidance groove to abut against the buffer boss. The battery pack housing of the present application.

[0005] For another example, the patent document with publication number CN108493370B discloses an aluminum alloy battery pack shell and a manufacturing method thereof, including an upper cover body and a lower shell body; a sealing strip is arranged between the upper cover body and the lower shell body, and a space for installing a battery module is formed; the upper cover body and the lower shell body are both composed of a combination of aluminum alloy plates; the aluminum alloy plates include an upper layer, a lower layer, an intermediate honeycomb core layer, and a first high-temperature resistant inorganic adhesive layer; it also includes a reinforcing layer arranged between the intermediate honeycomb core layer and the first high-temperature resistant inorganic adhesive layer, and a blocking structure in the honeycomb holes connected to the intermediate honeycomb core layer.

[0006] The above technologies all form the bottom plate by combining multiple layers, which has a relatively complex structure and is heavy.

[0007] To this end, an integrated bottom plate structure of the lower shell of a battery pack is proposed to solve the above technical problems. Utility Model Content

[0008] In order to solve the above technical problems, the purpose of the utility model is to provide an integrated bottom plate structure of the lower shell of the battery pack, integrating the liquid cooling plate and the honeycomb aluminum plate, which has the advantages of simple structure and light weight.

[0009] The technical solution adopted by the present utility model to solve the problem is as follows:

[0010] An integrated bottom plate structure of a battery pack lower housing, comprising: a lower plate, a liquid cooling plate is provided above the lower plate, a honeycomb core is provided between the lower plate and the liquid cooling plate, the liquid cooling plate includes a first plate body and a second plate body, a protrusion is formed on the second plate body, and a cooling liquid flow channel is formed between the protrusion and the first plate body.

[0011] As a further improvement of the above technical solution, a groove is provided on the honeycomb core, and the groove is adapted to the protrusion.

[0012] As a further improvement of the above technical solution, the cross-sectional shape of the honeycomb core is composed of several polygons.

[0013] 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.

[0014] As a further improvement of the above technical solution, the material of the honeycomb core is metal.

[0015] As a further improvement of the above technical solution, the material of the honeycomb core is aluminum, aluminum alloy or steel.

[0016] As a further improvement of the above technical solution, a connecting pipe is provided on the liquid cooling plate, there are at least two connecting pipes, and the connecting pipes are communicated with the cooling liquid flow channel.

[0017] As a further improvement of the above technical solution, an installation position is formed between the edge of the lower plate and the edge of the liquid cooling plate; further included is a frame of the battery pack lower housing, the frame is inserted into the installation position, and the frame is fixed to the lower plate and the liquid cooling plate by friction stir welding with piercing.

[0018] A battery pack lower housing includes the integrated bottom plate structure of the battery pack lower housing.

[0019] A battery pack includes the battery pack lower housing.

[0020] A new energy vehicle includes the battery pack.

[0021] The beneficial effect of the present utility model is: integrating the honeycomb core with the liquid cooling plate makes the structure more concise and reduces the overall weight. Description of the Drawings

[0022] The following further explains and illustrates the present utility model in conjunction with the description of the drawings and the specific embodiments.

[0023] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present utility model;

[0024] Figure 2 is a schematic cross-sectional structure diagram of the present utility model;

[0025] Figure 3 is Figure 2 an enlarged structure diagram of the part A shown;

[0026] Figure 4 is a connection schematic diagram of the present utility model and the frame of the lower shell of the battery pack.

[0027] In the figure: 1. lower plate; 2. liquid cooling plate; 21. first plate body; 22. second plate body; 23. protrusion; 24. cooling liquid flow channel; 25. connecting pipe; 3. honeycomb core; 31. groove; 4. installation position; 5. frame. Specific embodiments

[0028] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the 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, but it should not be construed as a limitation on the protection scope of the present utility model.

[0029] 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 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, and therefore should not be construed as a limitation on the present utility model.

[0030] 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 present number, above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed 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.

[0031] 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, and 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.

[0032] Refer to Figures 1 to 4, An integrated bottom plate structure for a battery pack lower housing, comprising: a lower plate 1, a liquid cooling plate 2 is provided above the lower plate 1, a honeycomb core 3 is provided between the lower plate 1 and the liquid cooling plate 2, the liquid cooling plate 2 includes a first plate body 21 and a second plate body 22, a protrusion 23 is formed on the second plate body 22, and a cooling liquid circulation channel 24 is formed between the protrusion 23 and the first plate body 21.

[0033] Water circulation is carried out through the cooling liquid circulation channel 24 to achieve water-cooled cooling. At the same time, the lower plate 1, the liquid cooling plate 2 and the honeycomb core 3 are combined to form a bottom plate, and the three are integrated together. Among them, the liquid cooling plate 2 is used for water cooling and serves as an upper plate to fix the honeycomb core 3, ensuring a simple structure and reducing the overall weight. The cooling liquid circulation channel 24 can be selected to have a serpentine layout.

[0034] As a preferred embodiment, the honeycomb core 3 is provided with a groove 31, and the groove 31 is adapted to the protrusion 23. It can ensure the adaptation of the honeycomb core 3 and the liquid cooling plate 2 and is beneficial to the stable installation of the honeycomb core 3.

[0035] The cross-sectional shape of the honeycomb core 3 is composed of several polygons. It can be composed of a single shape or multiple shapes. In this embodiment, it is composed of hexagons, and can also be composed of triangles, rectangles, pentagons, or can be composed of irregular shapes, or can be formed by various combinations of triangles, rectangles, pentagons, and hexagons.

[0036] As a preferred embodiment, the thickness direction of the honeycomb core 3 is perpendicular to the plane where the lower plate 1 is located.

[0037] As a preferred embodiment, the material of the honeycomb core 3 is metal.

[0038] As a preferred embodiment, the material of the honeycomb core 3 is aluminum, aluminum alloy or steel.

[0039] As a preferred embodiment, at least two connecting pipes 25 are provided at the top of the liquid cooling plate 2, and the connecting pipes 25 are communicated with the cooling liquid circulation channel 24. The connecting pipes 25 are used to realize the circulation of the cooling liquid and facilitate the connection of the pipelines.

[0040] As a preferred embodiment, an installation position 4 is formed between the edge of the lower plate 1 and the edge of the liquid cooling plate 2; further included is a frame 5 of the lower shell of the battery pack, and the frame 5 is inserted into the installation position 4. The frame 5 is fixed to the lower plate 1 and the liquid cooling plate 2 by friction stir welding with piercing. When installed and connected to the lower shell of the battery pack, the frame 5 of the lower shell of the battery pack extends into the installation position 4 for welding, which can ensure stable welding. Insert the frame 5 into the installation position 4 and start welding from one end until reaching the other side. Friction stir welding means that the heat generated by the friction between the high-speed rotating welding tool and the workpiece locally melts the material to be welded. When the welding tool moves forward along the welding interface, the plasticized material flows from the front of the welding tool to the rear under the rotational friction force of the welding tool and forms a dense solid-phase weld under the extrusion of the welding tool. During welding, the liquid cooling plate 2 pierces downward, successively penetrating the installation position 4, the frame 5 and the lower plate. Compared with the left-right structure welding in the prior art, the connection is more stable.

[0041] A lower shell of a battery pack, including the integrated bottom plate structure of the lower shell of the battery pack described above.

[0042] A battery pack, including the lower shell of the battery pack described above.

[0043] A new energy vehicle, including the battery pack described above.

[0044] 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 by using the description and drawings of the present invention under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An integrated bottom plate structure of a battery pack lower housing, characterized in that, Comprising: A lower plate (1), above which there is a liquid cooling plate (2). Between the lower plate (1) and the liquid cooling plate (2) there is a honeycomb core (3). The liquid cooling plate (2) comprises a first plate body (21) and a second plate body (22). On the second plate body (22) there is a protrusion (23), and between the protrusion (23) and the first plate body (21) there is formed a cooling liquid flow channel (24); There is an installation position (4) formed between the edge of the lower plate (1) and the edge of the liquid cooling plate (2); It further comprises a frame (5) of the lower shell of the battery pack, and the frame (5) is inserted into the installation position (4).

2. The integrated bottom plate structure of the lower shell of a battery pack according to claim 1, characterized in that: There is a groove (31) on the honeycomb core (3), and the groove (31) is adapted to the protrusion (23).

3. The integrated bottom plate structure of the lower shell of a battery pack according to claim 1, characterized in that: The cross-sectional shape of the honeycomb core (3) is composed of a plurality of polygons.

4. The integrated bottom plate structure of the lower shell of a battery pack according to 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.

5. The integrated bottom plate structure of the lower shell of a battery pack according to claim 1, characterized in that: The material of the honeycomb core (3) is metal.

6. The integrated bottom plate structure of the lower shell of a battery pack according to claim 5, characterized in that: The material of the honeycomb core (3) is aluminum, aluminum alloy or steel.

7. The integrated bottom plate structure of the lower shell of a battery pack according to claim 1, characterized in that: There is a connecting pipe (25) on the liquid cooling plate (2), and there are at least two connecting pipes (25), and the connecting pipes (25) are communicated with the cooling liquid flow channel (24).

8. A lower housing of a battery pack, characterized in that, Comprising the integrated bottom plate structure of the lower shell of a battery pack according to any one of claims 1-7, and the frame (5) is fixed to the lower plate (1) and the liquid cooling plate (2) by friction stir welding with piercing.

9. A battery pack, characterized in that, Comprising the lower shell of a battery pack according to claim 8.

Images