External adapter for battery pack used to power a portable device

Patent metadata

Field	Value
Publication number	US-9337667-B2
Application number	US-201313781103-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Feb 28, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

Embodiments include a rechargeable battery pack, system, and power adapter that allow the rechargeable battery pack to both power a host device though a set of host contacts and provide power, through the power adapter, via a set of charging contacts that interface with the power adapter. The power adapter contains a voltage source which activates a control circuit to disable a discharge protection circuit in the battery pack to allow current to discharge through the charging contacts.

First claim

I claim:

1. A power adapter for obtaining power from a rechargeable battery pack having a set of charging contacts and a set of device contacts, wherein the rechargeable battery pack contains protection circuitry to prevent discharge through the charging contacts, the adapter comprising:
a set of adapter contacts including a positive adapter contact that mates with a positive charger contact of the rechargeable battery pack, a negative adapter contact that mates with a negative charger contact of the rechargeable battery pack, and an auxiliary adapter contact that mates with an auxiliary charger contact of the rechargeable battery pack;
a battery cell connector having a positive terminal connected to the auxiliary adapter contact and a negative terminal connected to the negative adapter contact; and
an external power connector having a positive external power connector terminal operably coupled to the positive adapter contact and a negative external power connector terminal operably coupled to the negative adapter contact.

2. The power adapter of claim 1 , wherein the battery cell connector is adapted to hold a coin cell.

3. The power adapter of claim 1 , wherein the external power connector is a universal serial bus (USB) connector.

4. The power adapter of claim 1 , wherein the power adapter is disposed in a holster that is configured to accept a portable device to which the rechargeable battery pack is attached and align the charging contacts of the rechargeable battery pack with the adapter contacts.

5. The power adapter of claim 1 , further comprising a resettable fuse connected in series with the external power connector between the external power connector and either the positive adapter contact or the negative adapter contact.

6. The power adapter of claim 1 , further comprising a regulator circuit coupled in series with the external power connector configured to regulate at least one of a voltage or a current provided by the external power connector.

7. The power adapter of claim 1 , wherein the auxiliary charger contact of the rechargeable battery pack is a thermistor contact.

8. The power adapter of claim 1 , further comprising retaining features which hold the power adapter in place on the rechargeable battery pack.

9. A portable rechargeable battery pack system, comprising:
a portable rechargeable battery pack having at least one rechargeable cell, a set of host contacts coupled to the at least one rechargeable cell, a set of charging contacts including a positive charger contact, a negative charger contact, and an auxiliary charger contact, a discharge protection circuit element coupled between the at least one rechargeable cell and either the positive charger contact or the negative charger contact, a control circuit coupled to the discharge protection circuit, the control circuit having an input coupled to the auxiliary charger contact, wherein the control circuit disables the discharge protection circuit element when a sufficient voltage is provided at the auxiliary charger contact; and
a power adapter that mechanically couples to the portable rechargeable battery pack in a detachable manner, the power adapter having a positive adapter contact, a negative adapter contact, and an adapter auxiliary contact that mate with the positive charger contact, the negative charger contact, and the auxiliary charger contact of the portable rechargeable battery pack, respectively, the power adapter further having a voltage source coupled to the auxiliary adapter contact, the voltage source having a voltage sufficient to cause the control circuit to disable the discharge protection circuit element, and the power adapter further having an external power connector that provides power from the rechargeable battery pack when the power adapter is coupled to the rechargeable battery pack.

10. The portable rechargeable battery pack system of claim 9 , wherein the discharge protection circuit element is a transistor switch, the control circuit comprises a control switch transistor having a control terminal coupled to the auxiliary charger contact.

11. The portable rechargeable battery pack system of claim 9 , wherein the voltage source is a battery cell.

12. The portable rechargeable battery pack system of claim 9 , wherein the battery cell is a coin cell.

13. The portable rechargeable battery pack system of claim 9 , wherein the power adapter further comprises a circuit that is powered by the rechargeable battery pack and which performs a function that is unrelated to disabling the discharge protection circuit element.

14. The portable rechargeable battery pack system of claim 9 , wherein the power adapter is disposed in a holster that is configured to accept a portable device to which the rechargeable battery pack is attached and align the charging contacts of the rechargeable battery pack with the adapter contacts.

15. The portable rechargeable battery pack system of claim 9 , further comprising a resettable fuse connected in series with the external power connector between the external power connector and either the positive adapter contact or the negative adapter contact.

16. The portable rechargeable battery pack system of claim 9 , wherein the external power adapter further include a regulator circuit coupled in series with the external power connector configured to regulate at least one of a voltage or a current provided at the external power connector.

17. The portable rechargeable battery pack system of claim 9 , wherein the auxiliary charger contact of the rechargeable battery pack is a thermistor contact.

18. A holster for holding a host device having a rechargeable battery pack, the rechargeable battery pack having a set of charging contacts and a set of device contacts, the device contacts interface with the host device, the rechargeable battery pack contains protection circuitry to prevent discharge through the charging contacts, the holster comprising:
a set of adapter contacts including a positive adapter contact that mates with a positive charger contact of the rechargeable battery pack, a negative adapter contact that mates with a negative charger contact of the rechargeable battery pack, and an auxiliary adapter contact that mates with an auxiliary charger contact of the rechargeable battery pack;
a battery cell connector having a positive terminal connected to the auxiliary adapter contact and a negative terminal connected to the negative adapter contact; and
an external power connector having a positive external power connector terminal operably coupled to the positive adapter contact and a negative external power connector terminal operably coupled to the negative adapter contact.

19. The holster of claim 18 , further comprising a resettable fuse connected in series with the external power connector between the external power connector and either the positive adapter contact or the negative adapter contact.

20. The holster of claim 18 , wherein the external power connector is connected to an external device that is powered by the external power connector.

Assignees

• Motorola Solutions Inc

Inventors

• Arendell Scott J

Classifications

• H01M50/216

  adapted for button or coin cells · CPC title

• H01M50/583

  in response to current, e.g. fuses · CPC title

• H01M50/202

  Casings or frames around the primary casing of a single cell or a single battery · CPC title

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title

• A45F5/1516

  Holders or carriers for portable handheld communication devices, e.g. pagers or smart phones · CPC title