Adapters for rechargeable battery packs

• US 20010017531A1
• Filed: 02/26/2001
• Published: 08/30/2001
• Est. Priority Date: 02/24/2000
• Status: Abandoned Application

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: Sakakibara, Kazuyuki, Muramatsu, Tomoo
• Application Number:
  US09/794,746
• Publication Number:
  US 20010017531A1
• Time in Patent Office: Days
• US Class Current: 320/106
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries

Abstract

Control portion (26) of battery charger (10), for example, may control power source circuit (24) upon receipt of instructions from control portion (41) of adapter (30). Based upon these instructions, adapter (30) can enable charging operations for battery pack (50B) that does not have a memory storing charging parameters and/or information. Moreover, battery charger (10) also may be designed to charge a battery pack (50B) even though battery charger (10) was not originally designed to charge battery pack (50B). Adapter (30) also may enable charging operations for battery pack (50) that contains memory (61) storing charging parameters and/or battery identification information. In this case, adapter (30) can read information stored in memory (61) and generate optimal charging instructions based upon a charging program stored in control portion (41).

Claims

1. An adapter capable of coupling a rechargeable battery pack for a power tool to a battery charger comprising:

a first terminal adapted to receive data from the rechargeable battery pack,

a second terminal adapted to communicate instructions to the battery charger,

a third terminal adapted to communicate a charging current from the battery charger to the rechargeable battery pack,

a processor and

a memory storing a charging program for the rechargeable battery pack, wherein the processor generates charging current instructions that are communicated to the battery charger in order to control the supply of charging current to the rechargeable battery pack.

2. An adapter as in

claim 1

, wherein the processor is adapted to read information stored in a memory in the rechargeable battery pack and the processor is adapted to utilize the information to generate optimal charging current instructions.

3. An adapter as in

claim 1

, wherein the processor is adapted to monitor at least one battery condition during execution of the charging program in order to generate optimal charging instructions based upon changes in the battery condition.

4. An adapter as in

claim 3

, wherein the battery condition comprises a battery temperature increase rate during the charging operation.

5. An adapter as in

claim 1

, wherein the processor is adapted to generate duty cycle instructions that are communicated directly to a charging current supply of the battery charger.

6. An adapter as in

claim 1

, wherein the processor is coupled to a first ground that is separate from a second ground coupled to a charging current circuit of the battery charger.

7. An adapter as in

claim 1

, wherein the processor is adapted to receive information from the battery charger concerning a charging current circuit of the battery charger and the processor is adapted to generate charging instructions based upon the received information in order to optimally control the supply of charging current to the rechargeable battery pack.

8. An adapter as in

claim 1

, wherein the memory stores a charging program that is commonly utilized for a plurality of rechargeable battery packs that do not include a memory storing battery identification information or battery charging parameters.

9. An adapter as in

claim 1

, wherein the memory further stores a program adapted to eliminate memory effects in the rechargeable battery pack.

10. An adapter as in

claim 1

, wherein the processor is programmed to read information stored in a memory in the rechargeable battery pack and the processor utilizes the information to generate optimal charging current instructions, the processor generates duty cycle instructions that are communicated directly to a charging current supply of the battery charger and the processor is adapted to receive information from the battery charger concerning a charging current circuit of the battery charger and the processor generates charging instructions based upon the received information to optimally control the supply of charging current to the rechargeable battery pack.

11. An adapter as in

claim 10

, wherein the processor is programmed to monitor at least one one battery condition during execution of the charging program in order to generate optimal charging instructions based upon changes in the battery condition.

12. An adapter as in

claim 11

, wherein the battery condition comprises a battery temperature increase rate during the charging operation.

13. An adapter as in

claim 12

, wherein the processor is coupled to a first ground that is separate from a second ground coupled to a charging current circuit of the battery charger.

14. An adapter as in

claim 13

, wherein the memory stores a charging program that is commonly utilized for a plurality of rechargeable battery packs that do not include a memory storing battery identification information or battery charging parameters.

15. An adapter as in

claim 13

, wherein the memory further stores a program adapted to eliminate memory effects in the rechargeable battery pack.

16. A battery charging apparatus comprising:

the adapter of

claim 1

and

a battery charger comprising a power supply adapted to generate a charging voltage to supply to rechargeable batteries, a switch coupled to the power supply and a communication port coupled to the switch, wherein the communication port is adapted to transmit charging current control instructions generated by the adapter processor to the switch in order to directly control the charging current supplied to the rechargeable batteries and the adapter is removably detachable from the battery charger.

17. A battery charging apparatus as in

claim 16

, wherein the battery charger does not include a processor.

18. A battery charging apparatus comprising:

the adapter of

claim 10

and

a battery charger comprising a power supply adapted to generate a charging voltage to supply to rechargeable batteries, a switch coupled to the power supply and a communication port coupled to the switch, wherein the communication port is adapted to transmit charging current control instructions generated by the adapter processor to the switch in order to directly control the charging current supplied to the rechargeable batteries and the adapter is removably detachable from the battery charger.

19. A battery charging apparatus comprising:

the adapter of

claim 13

and

a battery charger comprising a power supply adapted to generate a charging voltage to supply to rechargeable batteries, a switch coupled to the power supply and a communication port coupled to the switch, wherein the communication port is adapted to transmit charging current control instructions generated by the adapter processor to the switch in order to directly control the charging current supplied to the rechargeable batteries and the adapter is removably detachable from the battery charger.

20. A battery charging apparatus as in

claim 19

, wherein the battery charger does not include a processor.

21. A battery charger for a power tool comprising:

a power supply adapted to generate a charging voltage,

a switch coupled to the power supply and adapted to generate a charging current to supply to a rechargeable battery and

a communication port adapted to receive charging instructions to control the supply of charging current to the rechargeable batteries, the instructions being generated by a processor that is external to the battery charger and the communication port is directly coupled to the switch.

22. A battery charger as in

claim 21

, wherein the communication port is further adapted to communicate information concerning the power supply to the external processor, wherein the external processor generates charging instructions based upon the power supply information and communicates the charging instructions to the switch to optimally control the supply of charging current to the rechargeable batteries.

23. A battery charger comprising:

a first regulated power supply adapted to generate a regulated voltage to be utilized by a processor and a battery temperature sensor,

a second regulated power supply utilized to generate a charging current,

a first ground line coupled to the second regulated power supply and

a second ground line coupled to the processor and the battery temperature sensor.

24. A battery charger as in

claim 23

, further comprising a communication port adapted to receive charging instructions to control the supply of charging current to the rechargeable batteries generated by a processor that is external to the battery charger.

25. A battery charger as in

claim 24

, wherein the communication port is further adapted to communicate information concerning the power supply to the external processor, wherein the external processor generates charging instructions based upon the power supply information and communicates the charging instructions to the battery charger to optimally control the supply of charging current to the rechargeable batteries.

26. A battery charger as in

claim 25

, further comprising a memory that stores a program adapted to eliminate memory effects in the rechargeable batteries.