CN221708868U - Bottom guard board - Google Patents

Abstract

The utility model relates to the technical field of battery boxes, and specifically to a bottom guard plate, which should be on the battery box, including a fiber layer, wherein the fiber layer is mainly formed by plying multiple layers of fiber reinforced sheets, wherein the interior of each fiber reinforced sheet and the surfaces between adjacent fiber reinforced sheets are completely infiltrated with a liquid elastomer, and the liquid elastomer is molded and cured into a solid elastomer, and is cured into a whole with the fiber layer. This solution proposes a method that can meet the working condition requirements of the bottom guard plate of the battery box for new energy vehicles for higher bottom impact, and can also achieve its requirements for lightness, thinness and weight reduction.

Description

A bottom guard plate

Technical Field

The utility model relates to the technical field of battery boxes, in particular to a bottom guard plate.

Background Art

The battery bottom guard plate can effectively prevent obstacles from invading the battery cell when the new energy battery is hit by the bottom or scraped, thereby reducing the risk of battery cell deformation and thermal runaway.

In the existing applications of the bottom guard plate of the bottom power battery of new energy vehicles, one method is to improve the impact resistance of the bottom guard plate by using thicker high-strength steel plates. This type of solution has a large weight ratio, and the thickened steel plate will greatly reduce the cruising range of the power battery; the other is a composite material plate made by compounding and stacking multiple layers of polymer materials. This type of plate is not heavy, but the thicker plate body will compress the distribution space of the battery.

Therefore, this solution proposes a method that can not only meet the working condition requirements of the bottom guard plate of the battery box for new energy vehicles for higher bottom impact, but also achieve its needs for lightness and weight reduction.

Utility Model Content

Technical issues solved

In view of the above-mentioned shortcomings of the prior art, the utility model provides a bottom guard plate, which can effectively solve the problems of heavy weight and large thickness of the battery bottom protection structure in the prior art.

Technical Solution

In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

The utility model provides a bottom guard plate, which should be on a battery box, and includes a fiber layer, wherein the fiber layer is mainly formed by plying multiple layers of fiber reinforced sheets, wherein the interior of each fiber reinforced sheet and the surfaces between adjacent fiber reinforced sheets are completely soaked with a liquid elastomer, and the liquid elastomer is molded and cured to be a solid elastomer, and is cured into a whole with the fiber layer.

Furthermore, it also includes a substrate layer, which is placed inside the fiber layer, laid flat between the fiber reinforced sheets, and is integrally formed with the fiber layer and the solid elastomer.

Furthermore, the substrate layer is one or more of a metal plate, a metal mesh, a hard foam board or a honeycomb board.

Furthermore, the liquid elastomer is a polyurethane elastomer.

Furthermore, the fiber-reinforced sheet is one of glass fiber, carbon fiber, basalt fiber or aramid fiber.

Beneficial Effects

Compared with the known public technology, the technical solution provided by the utility model has the following beneficial effects:

The bottom guard plate of this solution is produced by molding and curing the laminated fiber-reinforced sheets and the elastomer that can be cured into a solid state to produce an integrated structure plate body. The high strength and rigidity of the fiber layer are combined with the impact absorption capacity of the elastomer. Compared with the existing technology, the bottom guard plate of this product has a lower weight, thinner thickness, and better impact resistance, which can better reduce or avoid damage to the battery cell caused by external impact.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the structure of the bottom guard plate layer of the utility model;

FIG2 is a schematic diagram of the structure of the base material layer of the bottom guard plate of the present invention;

The reference numerals in the figure represent: 10, fiber layer; 20, base material layer; 30, elastomer.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

The utility model is further described below in conjunction with embodiments.

Example:

The utility model provides a bottom guard plate, which should be on the battery box. The bottom guard plate designed and produced by this scheme is mainly used to cope with the actual working conditions of high bottom impact that occurs during the driving of new energy vehicles. Compared with the bottom guard plate of the same projected area in the prior art, this product has low density, light weight, and is thinner.

Referring to Figure 1, the bottom guard plate in this scheme includes a fiber layer 10, which is mainly formed by laying up multiple fiber-reinforced sheets, wherein the interior of each fiber-reinforced sheet and the surfaces between adjacent fiber-reinforced sheets are completely infiltrated with a liquid elastomer 30, and the liquid elastomer 30 is a low-viscosity fluid presented when the elastic resin material is heated to a certain temperature, and can be used as a casting raw material. Then, the liquid elastomer 30 is molded and cured into a solid elastomer 30, and is cured into a whole with the fiber layer 10. The fiber layer 10 and the solid elastomer 30 are completely fused and cured, and the high strength and stiffness of the fiber layer 10 are utilized, and the impact absorption capacity of the elastomer 30 is matched, and the two groups of composite materials complement each other, and are cured to form a bottom guard plate with low weight, thin thickness, and better impact resistance. Thereby, the damage to the battery cell caused by external impact can be better reduced or avoided.

Specifically, in this embodiment, the liquid elastomer 30 is preferably a polyurethane elastomer 30; and the internal fiber-reinforced sheet 10 is preferably glass fiber. The liquid polyurethane elastomer 30 has excellent adhesion, elasticity and tensile resistance, and can fuse the multiple layers of fiber-reinforced sheets laid in the mold into a solid whole; at the same time, the composite fiber-reinforced sheet using glass fiber can improve the stiffness, strength and heat resistance of the solid polyurethane elastomer 30.

Of course, the material of the fiber-reinforced sheet can also be carbon fiber, basalt fiber or aramid fiber, all of which have the advantage of improving product strength. Among them, aramid fiber also has excellent tensile strength and impact resistance.

In addition to the preferred product structure of the present product described above, referring to FIG. 2 , in other implementations, a substrate layer 20 may be added inside the fiber layer 10 , and the substrate layer 20 is laid flat between the fiber reinforced sheets and integrally formed with the fiber layer 10 and the solid elastomer 30 into a plate body.

Specifically, the substrate layer 20 is mainly used to cooperate with the fiber layer 10 to further improve the strength of the bottom guard plate, as well as the ability to resist impact and puncture. The substrate layer 20 can be selected from one or more of a metal plate, a metal mesh, a hard foam board or a honeycomb board that is consistent with the surface size of the fiber layer 10, wherein the substrate layer 20 should be kept thin and light, and the thickness is controlled within 2 mm.

The following is a brief description of the process for integrally forming the bottom guard plate of the elastic body 30 in this embodiment:

1. Cut the fiber reinforced sheet according to product size requirements;

2. Heat the mold, the mold temperature is 50 ~ 150 ℃;

3. According to the layup design, lay the cut fiber-reinforced sheets in the mold in sequence;

4. Close the mold and use vacuum equipment to evacuate the mold to ensure that the vacuum degree inside the mold cavity is less than -0.8 Bar; apply pressure to the mold, the pressure value is the mold projection area x (200~1000) tons;

5. Heat the elastomer 30 material to reduce the viscosity of the elastomer 30 material to less than 1000 mPas so that the injection device can inject it into the mold cavity;

6. Inject the elastomer 30 material into the mold cavity at a preset flow rate and flow rate, so that it is fully infiltrated and combined with the reinforcing material;

7. After the injection is completed, keep the temperature and pressure;

8. Open the mold, take out the product and cool it down;

9. Cut the waste edges and holes of the product according to the drawing requirements. The holes are used for the subsequent installation and fixation of the bottom guard plate at the bottom of the battery cell.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A bottom guard plate to be attached to a battery case, comprising:

The fiber layers are mainly formed by layering a plurality of fiber reinforced sheets, wherein the inside of each fiber reinforced sheet and the surfaces of the adjacent fiber reinforced sheets are completely soaked with a liquid elastomer, and the liquid elastomer is molded and solidified into a solid elastomer and is solidified into a whole with the fiber layers.

2. The bottom guard plate of claim 1, further comprising a substrate layer disposed within the fibrous layer, disposed between the fibrous reinforcing sheets, and integrally formed with the fibrous layer and the solid elastomer.

3. The bottom guard plate of claim 2, wherein the substrate layer is one or more of a metal plate, a metal mesh, a rigid foam plate, or a honeycomb plate.

4. The bottom shield of claim 1 wherein the liquid elastomer is a polyurethane elastomer.

5. The bottom guard plate of claim 1, wherein the fiber reinforced sheet material is one of glass fiber, carbon fiber, basalt fiber, or aramid fiber.