Lithium battery shell structure of pure electric vehicle

Abstract

The utility model discloses a lithium battery shell structure of a pure electric vehicle, the structure comprises a pressure-bearing base and a battery pack shell, the pressure-bearing base is a flame-retardant plastic plate with a plurality of layers of fibers, the pressure-bearing base is formed by hot pressing, and lap joint tables are integrally formed at two side ends of the pressure-bearing base; the battery pack shell is integrally formed on the pressure-bearing base through injection molding, and the interior of the battery pack shell is used for containing a battery assembly; according to the preparation method, production of the battery shell is completed through two procedures of hot pressing and injection molding, the pressure-bearing base is subjected to hot pressing molding, then a hot-pressing piece serves as an insert and is put into a mold for injection molding of the battery pack shell, integrated fixed connection of the two components is achieved, and compared with a traditional battery shell structure, the strength is guaranteed, the weight is light, and the endurance mileage of a new energy vehicle is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery accessories, and particularly relates to a lithium battery housing structure for a pure electric vehicle. Background Art

[0002] For existing lithium batteries in pure electric vehicles, the maximum service life is about 6 years. The battery capacity of pure electric vehicles is usually between 15 - 60 kwh. The size of the capacity directly determines the cruising range and performance of electric vehicles. The battery is the most critical "heart" part of new energy vehicles. Therefore, a steel or aluminum shell is used to protect the internal battery cells to ensure the safe use of the battery. However, due to the large volume and high density of the shell, the overall weight of the battery components is increased, the load of the whole vehicle is increased, and the cruising range of the whole vehicle is shortened.

[0003] Therefore, how to provide a lithium battery housing structure for a pure electric vehicle with light weight and guaranteed structural strength and its preparation method is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0004] In view of this, the utility model provides a lithium battery housing structure for a pure electric vehicle, which reduces the weight of the traditional battery shell and the load of new energy electric vehicles, thereby improving the cruising range of electric vehicles.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A lithium battery housing structure for a pure electric vehicle, which includes:

[0006] A pressure-bearing base, the pressure-bearing base is a flame-retardant plastic plate with multiple layers of fibers, the pressure-bearing base is hot-pressed and formed, and overlapping platforms are integrally formed at both ends thereof.

[0007] A battery pack housing, the battery pack housing is integrally injection-molded on the pressure-bearing base, and the inside of the battery pack housing is used to hold battery components.

[0008] The technical effect of the utility model is that the pressure-bearing base plays the role of bearing the battery and installing it on the vehicle. Instead of the traditional heavy metal material, a flame-retardant plastic plate is used. The flame-retardant plastic plate contains multiple layers of fibers and has high anti-extrusion performance. The pressure-bearing base formed by hot-pressing such a plastic plate can withstand a high impact strength. This part meets the requirement of bearing the external impact pressure of the battery. On this basis, the battery pack housing is integrated. The battery pack housing is an injection-molded part, which is a structural part that does not bear direct impact pressure. Its inside is used to hold battery components to ensure the normal application of other functions. This product reduces the weight compared with the traditional battery shell component and ensures the structural strength. Under the same conditions, it is beneficial to extend the cruising range of electric vehicles.

[0009] Preferably, the fiber layer is composed of long fibers, or composed of short fibers, or composed of a mixture of long fibers and short fibers.

[0010] The resulting technical effect is that the fibers in the pressure-bearing base can improve the anti-extrusion performance of the component, can withstand a relatively high impact strength, and while reducing the mass of the component, ensure the bearing capacity of the component.

[0011] Preferably, side plates are provided on the pressure-bearing base, the edges of the side plates have chamfers, the adjacent side plates of the battery pack housing are transitioned with rounded corners, and the rounded corners of the battery pack housing are fixedly connected in adaptation with the chamfers at the edges of the side plates.

[0012] The resulting technical effect is that the pressure-bearing base is combined with the battery pack housing, the battery pack housing can provide a containing space for the battery assembly, and at the same time ensure the normal functional use of the battery. Both the chamfers and the rounded corners can improve the anti-bending ability of the component.

[0013] The present utility model also discloses a preparation method for a lithium battery housing structure of a pure electric vehicle, which includes the following steps:

[0014] Step 1: Prepare hot-pressing raw materials. The hot-pressing raw materials are composed of fiber materials, and a refractory material and a filler are added to the fiber materials. Use a hot press to hot-press and form a pressure-bearing base;

[0015] Step 2: Body production. Put the pressure-bearing base in Step 1 into an injection mold for the battery pack housing to injection-mold the non-pressure-bearing part of the battery pack housing. The battery pack housing and the pressure-bearing base are integrally fixed.

[0016] The resulting technical effect is that compared with the prior art, the material of the battery housing changes from a metal material to a plastic material. The production of the battery housing is completed through two processes of hot pressing and injection molding. The weight of the battery is reduced by about 8 Kg, solving the problem of the relatively heavy weight of the original battery housing, thereby reducing the vehicle load and increasing the cruising range of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall structure diagram of a lithium battery housing structure of a pure electric vehicle according to the present utility model;

[0018] Figure 2 It is a structure diagram of a pressure-bearing base of a lithium battery housing structure of a pure electric vehicle according to the present utility model.

[0019] 1 Pressure-bearing base, 2 Lapping platform, 3 Battery pack housing, 4 Insert, 5 Chamfer, 6 Rounded corner. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Referring to the attached drawings of the present invention Figures 1 to 2 , according to an embodiment of the present invention, a lithium battery housing structure for a pure electric vehicle includes:

[0022] A pressure-bearing base 1, the pressure-bearing base 1 is a flame-retardant plastic plate with multiple layers of fibers. The pressure-bearing base 1 is hot-pressed and integrally formed with overlapping platforms 2 at both ends thereof.

[0023] A battery pack housing 3, the battery pack housing 3 is integrally injection-molded on the pressure-bearing base 1, and the inside of the battery pack housing 3 is used to contain battery components.

[0024] In other embodiments, the fiber layer is composed of long fibers, or short fibers, or a mixture of long fibers and short fibers.

[0025] It can be understood that the main material of the flame-retardant plastic plate is actually a fiber material, and the plate is obtained by hot-pressing with a hot press.

[0026] In some other specific embodiments, side plates are provided on the pressure-bearing base 1, the ends of the side plates have chamfers 5, the angles between adjacent side plates of the battery pack housing 3 are rounded transitions, and the rounded corners 6 of the battery pack housing 3 are adaptively connected to the chamfers 5 at the ends of the side plates. The chamfers and rounded corners can slow down stress concentration and enhance the load-bearing capacity of the structure.

[0027] The present invention also discloses a preparation method for a lithium battery housing structure for a pure electric vehicle, which includes the following steps:

[0028] Step 1: Prepare hot-pressing raw materials. The hot-pressing raw materials are composed of fiber materials, which can be fiber materials such as cellulose fibers, plant fibers, and inorganic fibers, or PP fiber materials. Fire-resistant materials and fillers are added to the fiber materials, and a pressure-bearing base is hot-pressed using a hot press;

[0029] Step 2: Main body production. Place the pressure-bearing base in Step 1 as an insert into the injection mold for the battery pack housing. The injection mold is used to injection-mold the non-pressure-bearing part of the battery pack housing. At the same time, place other inserts 4 in the mold. It can be understood that the battery pack housing is injection-molded on the pressure-bearing base. Compared with the prior art, the material of the battery housing changes from a metal material to a plastic material. The production of the battery housing is completed through two processes of hot pressing and injection molding. The overall weight is reduced by about 8 Kg, solving the problem of the heavy weight of the original battery housing, thereby reducing the vehicle load and extending the cruising range of the new energy vehicle.

[0030] For the devices and usage methods disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, refer to the description in the method section.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lithium battery housing structure for a pure electric vehicle, characterized in that, Comprising: A pressure-bearing base (1), the pressure-bearing base (1) being a flame-retardant plastic plate with multiple layers of fibers, the pressure-bearing base (1) being hot-pressed and integrally formed with overlapping platforms (2) at both ends thereof; A battery pack housing (3), the battery pack housing (3) being integrally injection-molded on the pressure-bearing base (1), and the interior of the battery pack housing (3) being used to contain battery components.

2. The structure of a lithium battery housing for a pure electric vehicle according to claim 1, characterized in that, The fiber layer is composed of long fibers, or composed of short fibers, or composed of a mixture of long fibers and short fibers.

3. A lithium battery housing structure for a pure electric vehicle according to any one of claims 1-2, characterized in that, Side plates are provided on the pressure-bearing base (1), the ends of the side plates having chamfers (5), and the adjacent side plates of the battery pack housing (3) are transitioned with rounded corners, and the rounded corners (6) of the battery pack housing (3) are adaptively connected to the chamfers (5) at the ends of the side plates.

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