DE29504470U1 - Insulation half shells with fixation geometry for cylindrical secondary cells in helicopter models with electric drive - Google Patents

Description

State of the art

Cylindrical secondary cells (e.g. NiCd cells) for use in electrically powered model helicopters are traditionally packaged in plastic tubing that shrinks when exposed to heat. This shrink tubing is usually very thin-walled and therefore very sensitive to impact and pressure under everyday conditions. The heat supplied during the shrinking process is passed on to the battery cells in the shrink tubing and can cause thermal damage to them. Proper shrinking is labor-intensive, and the cost of insulating packaging with shrink tubing is therefore high. Due to the smooth outer structure of the cell pack, it must be attached to the helicopter using strong fastening parts. These are expensive and complex to manufacture. If the flight batteries are installed or replaced, they may only be attached at a specific point relative to the model's longitudinal axis in order to maintain the model's center of gravity. Traditionally, people use markings or accept an incorrect center of gravity. This impairs the model's flight performance. Completely shrinking the cells prevents the heat generated when the cells are discharged from dissipating freely, which leads to a shortened battery life.

problem

The invention specified in claim 1 is based on the problem of creating an insulating packaging for the flight batteries (3) that is form-fitting with the helicopter mechanics. By shaping its geometry, it is intended to achieve a connection to the helicopter mechanics (2) that is easy to detach but nevertheless secure against the cells slipping. The insulating packaging should allow the ambient air to flow largely unhindered directly to the cells in order to achieve the best possible cooling. For a quick and therefore cost-effective assembly of the flight batteries, the multi-part insulating packaging (1) should be able to be detachably or permanently connected to one another (4).

invention

This problem is solved by the measures of claim 1.

Advantageous effects of the invention

With the invention, in the specified application, it is achieved that the appropriate geometric design of the insulation half-shells (1) results in a positive connection between the assembled battery pack and the helicopter mechanics (2). For this reason, fastening parts of the helicopter mechanics do not need to be

are no longer so large and therefore expensive. When installing and replacing the battery packs, the battery packs are always in a precisely defined position relative to the model's longitudinal axis. This means that the model's center of gravity is always the same and thus flight characteristics are reproducible. The battery packs can be installed blindly with the center of gravity correct, so to speak.

Further development of the invention

Advantageous embodiments of the invention are specified in claims 2 and 3.

The further development according to claim 2 enables the almost completely unhindered flow of ambient air directly to the cells (3) when the insulation half-shells {1} are designed in a partially covering design. The cooling effect achieved during discharging increases the expected service life of the cells while at the same time improving the discharge properties. When the insulation packaging (1) is designed in a completely closed design, a particularly high mechanical insensitivity of the cells to external environmental influences is achieved.

The development according to claim 3 enables the cells (3) to be assembled easily and inexpensively by simply sliding over the insulation half-shells (1), which are made of plastic, for example, deep-drawn or injection-molded. The half-shells can be fixed to one another using adhesive tape, rubber rings or cable ties (4).

Description of the invention

An embodiment is explained using Figure 1. It shows:

Fig. 1 a multi-cell pack of cylindrical secondary cells assembled by two insulation half-shells, which due to their geometric design provide a positive connection with the
enable helicopter mechanics.

In Fig. 1, two insulating half-shells (l) partially enclose the battery pack (3) formed by several cylindrical secondary cells. The recesses formed in the lower half-shell can engage in a corresponding receptacle on the model helicopter mechanism (2). The half-shells are connected to one another by a strip of adhesive tape (4).

Claims (3)

1. Insulation half-shell *for cylindrical* secondary cells in helicopter models with electric drive characterized, that a suitable geometry is incorporated into the insulation half-shells (1) which ensures fixation against slipping or loosening by means of a positive connection with the helicopter mechanism (2). 2. Insulation half-shells according to claim 1 characterized, that the insulation half-shells (1) partially or completely enclose the cell pack (3). 3. Insulation half-shells according to claims 1 and 2 characterized, that the insulation half-shells (1) are fixed to one another around the cell pack (3) by means of a detachable or non-detachable connection (4).