Hybrid and electric vehicle battery pack maintenance device

1. A battery maintenance device for performing maintenance on a battery pack of an automotive vehicle powered by the battery pack, comprising:

communication circuitry configured to retrieve information related to state of charge of batteries/cells of the battery pack obtained using sensors in the battery pack;

measurement circuitry separate from the sensors in the battery pack configured to couple to batteries/cells of the battery pack and obtain measurement information related to a measured state of charge of batteries/cells of the battery pack;

a controller connected to the communication circuitry and the measurement circuitry configured to verify operation of the sensors in the battery pack by comparing the retrieved information with the measurement and provide a comparison output;

and

output circuitry connected to the controller configured to provide an output indicative of a failing sensor, among the sensors, in the battery pack based upon the comparison output, wherein the output is used to calibrate a sensor of the battery pack.

2. The battery maintenance device of claim 1 wherein the measurement circuitry couples to battery/cells in the battery pack using Kelvin connections.

3. The battery maintenance device of claim 1 wherein the measurement circuitry applies a resistive load to battery/cells of the battery pack.

4. The battery maintenance device of claim 1 wherein the measured state of charge of battery/cells of the battery pack comprises voltage.

5. The battery maintenance device of claim 1 wherein the measured state of charge of battery/cells of the battery pack comprises a dynamic parameter.

6. The battery maintenance device of claim 1 wherein the comparison output from the controller is indicative of the retrieved information and the measurement being within an acceptable range.

7. The battery maintenance device of claim 6 wherein the acceptable range is stored in a memory.

8. The battery maintenance device of claim 1 wherein the output is provided to an operator.

9. The battery maintenance device of claim 1 wherein the output is provided to the battery pack.

10. The battery maintenance device of claim 1 wherein the output is used to program a controller of the battery pack.

11. The battery maintenance device of claim 1 wherein the output is provided to a remote location.

12. A method of repairing a battery pack or module of a battery pack comprising:

retrieving information related to state of charge of batteries/cells of the battery pack obtained using sensors in the battery pack;

measuring a state of charge of battery/cells of the battery pack using measurement circuitry separate from the sensors in the battery pack and providing measurement information output;

verifying operation of the sensors in the battery pack by comparing the retrieved information with the measurement information and providing a comparison output; outputting information related to a failing sensor, among the sensors, in the battery pack based on the comparison output;

calibrating the sensors in the battery pack based upon the comparing.

13. The method of claim 12 wherein the measurement circuitry couples to battery/cells in the battery pack using a Kelvin connection.

14. The method of claim 12 wherein the measuring includes applying a resistive load to battery/cells of the battery pack.

15. The method of claim 12 wherein the measured state of charge of battery/cells of the battery pack comprises voltage.

16. The method of claim 12 wherein the measured state of charge of battery/cells of the battery pack comprises a dynamic parameter.

17. The method of claim 12 wherein the comparison output is indicative of the retrieved information and the measurement being within an acceptable range.

18. The method of claim 17 wherein the acceptable range is stored in a memory.