Battery for a handheld machine tool and method for producing a battery for a handheld machine tool
AssigneeHilti Aktiengesellschaft
InventorsBenno Verhaag, Bernd Ziegler, Hubert Ludwig, Michael Brandner, Klaus Hauser
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Abstract
The battery unit according to the invention for a handheld machine tool comprises a number of battery cells, with at least one of the battery cells being embodied as an isolation battery cell, and showing a fire protection jacket comprising an intumescent material. The fire protection jacket surrounds the isolation battery cell at least partially such that the isolation battery cell is surrounded by the fire protection jacket at a predetermined temperature such that the isolation battery cell is thermally insulated.
Claims18
A battery unit for a handheld machine tool comprising:
- a housing;
- a plurality of battery cells, with at least one of the battery cells being an isolation battery cell;
- one or more fasteners securing at least one of the battery cells within the housing;
- and
- a fire protection jacket having a network structure;
- wherein the fire protection jacket and one or more fasteners comprise a binder and an intumescent material homogenously distributed in said binder;
- wherein said fire protection jacket at least partially surrounds the isolation battery cell and at least partially coats the inside of the housing;
- wherein the fire protection jacket expands at a predetermined temperature above the operating temperature of the isolation battery cell such that the isolation battery cell is thermally insulated and the housing is sealed;
- wherein said intumescent material comprises a carbon network former, a dehydration catalyst and a propellant.
A method for the production of a battery unit for a handheld machine tool comprising:
- providing a housing;
- providing a number of battery cells, with at least one of the battery cells being an isolation battery cell;
- securing at least one battery cell within the housing using at least one fastener;
- providing a fire protection jacket having a network structure;
- and
- at least partially surrounding the isolation battery cells and at least partially coating the housing with the fire protection jacket
- wherein the fire protection jacket and one or more fasteners comprise a binder and an intumescent material homogenously distributed in said binder;
- wherein the isolation battery cell expands at a predetermined temperature above the operating temperature of the isolation battery cell such that the isolation battery cell is thermally insulated and the housing is sealed;
- wherein said intumescent material comprises a carbon network former, a dehydration catalyst and a propellant.
Dependencies are inferred from the claim text.