Automatic battery analyzer including apparatus for determining presence of single bad cell

The method of determining the acceptability of an electrical storage battery comprising:

• the first step of performing an electrical load test on said battery;
• the second step of performing a voltage bounce back test on said battery;
• the third step of performing a test responsive to the rate of change of the battery voltage while the battery is under a load;
• and
• the fourth step of determining from the results of said first, second, and third steps the acceptability of said battery.

The method of determining the acceptability of an electrical storage battery comprising:

• the first step of placing a load on said battery, determining whether the battery terminal voltage is above a first predetermined level after a first predetermined period of time, and removing said load from said battery;
• the second step of determining whether the battery terminal voltage is above a second predetermined level after a second predetermined period of time following the removal of said load from said battery;
• the third step of determining whether the rate of change of the battery voltage while the battery is under load is above a third predetermined value;
• and
• the fourth step of determining from the results of said first, second, and third steps whether said battery is acceptable.

Apparatus for determining the acceptability of a storage battery under test and comprising:

• first circuit means for coupling to the battery under test and performing a load test on said battery;
• second circuit means for coupling to the battery under test and performing a voltage bounce back test on said battery;
• third circuit means for coupling to the battery under test, placing a load on said battery, and testing whether the battery voltage increase is greater than a predetermined amount during a time period;
• and
• fourth circuit means coupled to said first, second, and third circuit means for controlling the sequence in which the tests of said first, second, and third circuit means are performed and providing a readout responsive to outputs of said first, second, and third circuit means.

The method of determining the acceptability of an electrical storage battery comprising:

• the first step of performing an electrical load test on said battery;
• the second step of performing a voltage bounce back test on said battery;
• the third step of performing a test responsive to whether the battery voltage increases greater than a predetermined amount during a time period while the battery is under a load;
• and
• the fourth step of determining from the results of said first, second, and third steps the acceptability of said battery.

The method of determining the acceptability of an electrical storage battery comprising:

• the first step of placing a load on said battery, determining whether the battery terminal voltage is above a first predetermined level after a first predetermined period of time, and removing said load from said battery;
• the second step of determining whether the battery terminal voltage is above a second predetermined level after a second predetermined period of time following the removal of said load from said battery;
• the third step of determining whether the rate of change of the battery voltage increases greater than a predetermined amount during a time period while the battery is under load;
• and
• the fourth step of determining from the results of said first, second, and third steps whether said battery is acceptable.