BATTERY FOR A HANDHELD MACHINE TOOL AND METHOD FOR PRODUCING A BATTERY FOR A HANDHELD MACHINE TOOL

• US 20150325826A1
• Filed: 07/16/2015
• Published: 11/12/2015
• Est. Priority Date: 01/16/2013
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Ziegler, Bernd, Brandner, Michael, Verhaag, Benno, Ludwig, Hubert, Hauser, Klaus
• Granted Patent: US 10,833,300 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C09K 21/00 Fireproofing materials for use in a particular application, see the relevant places, e.g. fireproofing of wood B27K, of polymers C08, of textiles D06M, of paper D21H; fireproof paints C09D5/18
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/6235 Power tools
• CPC Class Codes: H01M 10/658 by thermal insulation or shielding
• CPC Class Codes: H01M 10/659 by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/24 adapted for protecting batteries from their environment, e.g. from corrosion thermal insulation H01M10/658
• CPC Class Codes: H01M 50/244 Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
• CPC Class Codes: H01M 50/247 specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
• CPC Class Codes: H01M 50/262 with fastening means, e.g. locks
• CPC Class Codes: H01M 50/264 for cells or batteries, e.g. straps, tie rods or peripheral frames
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/4911 including sealing

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.

Claims

1. A battery unit for a handheld machine tool comprising:

a plurality of battery cells, with at least one of the battery cells being an isolation battery cell; and

a fire protection jacket comprising an intumescent material,

wherein said 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.

2. A battery unit of claim 1 wherein the fire protection jacket is embodied to reduce the oxygen supply to the isolation battery cell at a predetermined temperature.

3. A battery unit of claim 1 wherein the fire protection jacket is embodied to be liquid-tight at a predetermined temperature.

4. A battery unit of claim 1 wherein the fire protection jacket comprises a polymer.

5. A battery unit of claim 1 wherein the fire protection jacket shows a network structure.

6. A battery unit of claim 1 wherein the fire protection jacket comprises a fire proofing belt, a fire proofing mat, fire proofing foam, or a foam mat.

7. A battery unit of claim 1 wherein all battery cells are embodied as isolation battery cells.

8. A battery unit of claim 1 wherein the fire protection jacket at least partially surrounds all battery cells jointly such that the battery cells in the battery unit at the predetermined temperature are surrounded by the fire protection jacket such that the battery cells are thermally insulated from the environment.

9. A battery unit of claim 8 wherein the battery unit comprises a housing and the fire protection jacket is integrated at least partially in said housing.

10. A battery unit of claim 1 wherein the battery cells are suspended in a fastener and the fastener is made from a fire proofing material.

11. A battery of claim 1 wherein the battery unit comprises a housing and the fire protection jacket surrounds at least partially any material arranged inside the housing such that the material is surrounded by the fire protection jacket at the predetermined temperature such that the material is thermally insulated.

12. A handheld machine tool with an accumulator according to claim 1.

13. A method for the production of a battery unit for a handheld machine tool comprising:

providing a number of battery cells, with at least one of the battery cells being an isolation battery cell;

providing a fire protection jacket showing intumescent material; and

at least partially surrounding the isolation battery cells with a fire protection jacket

wherein the isolation battery cell is surrounded by the fire protection jacket at a predetermined temperature such that the isolation battery cell is thermally insulated.