Battery case and electric skateboard using same

A battery case includes a bottom plate part and two side plate parts extending oppositely from the bottom plate part, wherein each of the side plate parts has at least one opening, in which an elastic element is arranged. An electric skateboard includes a bearing deck, wheels mounted on both ends of the bearing deck, an electric motor mounted under the bearing deck, and said battery case which is mounted under the bearing deck. The side plate parts of the battery case have openings in which elastic elements are arranged. Therefore, when pressure is exerted by the bearing deck to the battery case, the opening of the battery case is able to squeeze the elastic element so that the battery case can undergo an elastic deformation easily.

CROSS REFERENCE TO RELATED APPLICATION

The present application is the U.S. national stage application of International Application PCT/CN2013/090076, filed Dec. 20, 2013. The International Application claims priority of Chinese Patent Application 201320433438.X, filed Jul. 19, 2013, the contents of which are incorporated herein by reference in their entireties.

FIELD OF INVENTION

The present invention relates to a battery case and an electric skateboard using the same, especially to a battery case used for an electric skateboard and an electric skateboard using same.

PRIOR ARTS

As we all know, the skateboard for entertainment or sports is capable of bearing the weight of at least one person. The deck of the skateboard for bearing a person is usually elastic. The middle part of the deck elastically deforms downwards when a sportsman steps onto the skateboard, and restores its shape when the sportsman steps down. However, for an electric skateboard, since the battery pack and the battery case holding the battery pack ought to be mounted under the deck, it is inevitable to influence the elastic deformation of the deck. In some worse cases, the elastic deformation of the deck may even damage the battery case. In order to avoid this risk, some manufacturers divide the battery case into two and mount them at the two ends of the deck respectively, so that the influence of the battery cases on the elastic deformation of the deck is reduced to the greatest extent. However, it is difficult to manage the battery under this arrangement, and the problem of the unbalance of the battery may emerge. The battery may become unreliable and the life of the battery may be shortened.

Therefore, it is necessary to make improvement to it.

SUMMARY OF THE INVENTION

The technical problem this invention intends to solve is to provide a battery case with better performance of its elastic deformation.

The technical solution of this invention is as follows:

A battery case for an electric skateboard, comprising a bottom plate part and two side plate parts extending oppositely from the bottom plate part, each of the side plate parts has at least one opening, in which an elastic element is arranged.

Preferably, the elastic element is integrated with the side plate part.

Preferably, the elastic element is assembled on the side plate part.

Preferably, the elastic element comprises a main body part and cylindrical bodies extruding from the main body part and having protrusions, wherein both sides of the opening have through holes, and the main body part is inserted into the through holes and is fixed by the protrusions.

Preferably, a connecting part for connecting with the electric skateboard is mounted on the side plate part.

Preferably, the battery case comprises two end plate parts, which extend respectively from the two ends of the bottom plate part and connect respectively with the two side plate parts.

Another technical problem this invention intends to solve is to provide an electric skateboard with better performance of its elastic deformation.

The technical solution of this invention is as follows:

An electric skateboard, comprising a bearing deck, wheels mounted on both ends of the bearing deck, and an electric motor mounted under the bearing deck, further comprises the battery case mentioned above, which is mounted under the bearing deck.

Preferably, a connecting part for connecting with the bearing deck of the electric skateboard is mounted on the side plate part.

Preferably, the battery case comprises two end plate parts, which extend respectively from the two ends of the bottom plate part and connect respectively with the two side plate parts.

This invention has the following advantageous effects: the battery case of this invention has side plate parts with openings, and elastic elements are arranged therein. Therefore, when pressure is exerted by the bearing deck to the battery case, the opening of the battery case is able to squeeze the elastic element so that the battery case can undergo an elastic deformation easily.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring toFIG. 1, the electric skateboard of this invention comprises an elongated bearing deck1, four wheels2mounted on both ends of the bearing deck1, an electric motor3mounted under the bearing deck1and an elongated battery case4mounted under the middle of the bearing deck1. A battery pack for supplying electricity to the electric motor3can be installed in the battery case4.

FIGS. 2 and 3show the battery case of the first embodiment of this invention. In this embodiment, the battery case4comprises a bottom plate part41and two side plate parts42extending oppositely from the bottom plate part41and two end plate parts43, which extend respectively from the two ends of the bottom plate part41and connect respectively with the two side plate parts42. Between the two side plate parts42, there forms a cavity where the battery pack (not shown) can be installed. The two end plate parts43on both ends can form the cavity into a cavity with both ends sealed such that when the battery case4is mounted on the electric skateboard, the battery pack can be packaged better and have damp-proof function.

Referring toFIG. 3, each side plate part42has at least one opening40, here in this embodiment, 3 openings, while in other embodiments, it can have other numbers of openings. Each opening40is configured with an elastic element44. The material of the elastic element44can be chosen from elastic plastic materials. In this embodiment, the battery case4is shaped by injection molding in the mold. Afterwards, the elastic element44is shaped by overmolding, so that the battery case4and the elastic element44are integrated without any assembling required. After shaping, some part of the elastic element44fills inside the opening40. Thus, when receiving the downward pressure exerted by the bearing deck1, the battery case4deforms downwards, and the opening40becomes smaller under this pressure. The closer the opening40is to the force-bearing point, the larger the extent of the opening40getting smaller is. The elastic element44inside the opening40is pressed accordingly. Since the elastic element44is elastic and capable of getting deformed easily, the whole battery case4can then achieve elastic deformation without breaking under the pressure exerted by the bearing deck1or fiercely preventing the bearing deck1from elastic deforming.

Referring toFIGS. 2 and 3, each side plate part42is equipped with several connecting parts45for connecting with the bearing deck1. In this embodiment, the connecting parts45are nuts embedded in the side plate part42. These nuts can be connected with the threaded fastener passing through the bearing deck1so that the battery case4is assembled under the bearing deck1.

FIG. 4shows the exploded view of the battery case of the second embodiment of this invention. The difference between this embodiment and the first embodiment only lies in the elastic element44′. In this second embodiment, the elastic element44′ is manufactured separately, and is then assembled to the opening40of the side plate part42. The elastic element44′ comprises a main body part441′ and several cylindrical bodies442′ extruding from the main body part441′, wherein each cylindrical body442′ has a protrusion. Each opening40has a plurality of through holes401at both sides of it. When assembled, the cylindrical bodies442′ of the elastic element44′ are inserted into the corresponding through holes401and are fixed by the protrusions.