Battery module and hearing device
A battery module for a hearing device includes a secondary cell and two contact elements for making contact with the secondary cell at two different potential areas. A fuse which is arranged at a short distance from the contact element that is assigned to a positive potential. A copper jacket surrounds the secondary cell, and a ferrite jacket is arranged on the outside of the copper jacket. An induction coil is arranged on the outside of the ferrite jacket and is configured to inductively receive energy for charging the battery module. A resonant capacitor is coupled to the induction coil at a short distance from the latter. A thermistor for monitoring a cell temperature is arranged with electrical insulation from the secondary cell but is coupled to the latter with low thermal resistance using heat-transfer capability.
1. A battery module for a hearing device, the battery module comprising:
a secondary cell having a positive potential and a negative potential;
two contact elements, including a contact element for making contact with the positive potential of said secondary cell and a contact element for making contact with the negative potential of said secondary cell;
a fuse arranged in close vicinity of said contact element for making contact with the positive potential;
a copper jacket surrounding said secondary cell;
a ferrite jacket arranged on an outside of said copper jacket;
an induction coil arranged on an outside of said ferrite jacket, said induction coil being configured to inductively receive energy;
a resonant capacitor connected to said induction coil in close vicinity of said induction coil; and
a thermistor for monitoring a cell temperature, said thermistor being electrically insulated with respect to said secondary cell but thermally coupled to said secondary cell with low thermal resistance for heat transfer between said secondary cell and said thermistor.
2. The battery module according to claim 1 , wherein said two contact elements are electrically insulated with respect to said secondary cell at least in certain sections by an insulation layer in an intended assembly state.
3. The battery module according to claim 2 , wherein said thermistor rests on said insulation layer.
4. The battery module according to claim 1 , wherein said ferrite jacket is an inherently stable injection-molded component.
5. The battery module according to claim 1 , wherein said ferrite jacket is formed of a flexible film material.
6. The battery module according to claim 1 , wherein said copper jacket is formed of a copper film.
7. The battery module according to claim 6 , wherein said copper film is coated with an insulation layer at least on an inside of said copper jacket.
8. The battery module according to claim 7 , wherein copper film is also coated with an insulation layer on an outside of said copper jacket, and said thermistor rests on said copper film on the outside.
9. The battery module according to claim 6 , wherein said copper film has a thickness of 0.2 millimeters and is a strip with hooking structures which are complementary to one another at respective ends and are hooked into one another to form a ring jacket.
10. The battery module according to claim 6 , wherein said copper film of said copper jacket has a thickness of at least 0.08 millimeters and no more than 0.15 millimeters, and wherein said induction coil is applied to said ferrite jacket as a braided coil or wire coil.
11. The battery module according to claim 10 , wherein said copper film of said copper jacket has a thickness of approximately 0.13 millimeters.
12. The battery module according to claim 1 , further comprising a circuit carrier carrying said fuse, said resonant capacitor, and said thermistor.
13. The battery module according to claim 12 , wherein said circuit carrier is a flexible circuit carrier arranged to encircle said ferrite jacket, and said flexible circuit carrier carries said induction coil formed as a conductor track.
14. The battery module according to claim 1 , wherein:
said two contact elements are electrically insulated with respect to said secondary cell at least in certain sections by an insulation layer in an intended assembly state;
said thermistor rests on said insulation layer;
said ferrite jacket is formed of a flexible film material;
said copper film has a thickness of 0.2 millimeters and is a strip with hooking structures which are complementary to one another at respective ends and are hooked into one another to form a ring jacket; and
said fuse, said resonant capacitor, and said thermistor are carried on a circuit carrier.
15. A hearing device, comprising a battery module having:
a secondary cell having a positive potential and a negative potential;
two contact elements, including a contact element for making contact with the positive potential of said secondary cell and a contact element for making contact with the negative potential of said secondary cell;
a fuse arranged in close vicinity of said contact element for making contact with the positive potential;
a copper jacket surrounding said secondary cell;
a ferrite jacket arranged on an outside of said copper jacket;
an induction coil arranged on an outside of said ferrite jacket, said induction coil being configured to inductively receive energy;
a resonant capacitor connected to said induction coil in close vicinity of said induction coil; and
a thermistor for monitoring a cell temperature, said thermistor being electrically insulated with respect to said secondary cell but thermally coupled to said secondary cell with low thermal resistance for heat transfer between said secondary cell and said thermistor.
16. The hearing device according to claim 15 , configured as a hearing aid device.
17. The hearing device according to claim 15 , configured as an in-the-ear (ITE) hearing aid.