Systems and methods to protect against over-discharge in a battery system

A method of estimating the voltage of a battery pack comprising a plurality of subdivisions, the method comprising:

• determining a plurality of subdivision electrical parameters, each subdivision electrical parameter of the plurality of electrical parameters being associated with one of the plurality of subdivisions;
• identifying a subdivision satisfying a criterion based on the plurality of subdivision electrical parameters;
• determining a pack electrical parameter associated with the battery pack;
• generating an adjusted pack electrical parameter based on the subdivision electrical parameter of the identified subdivision and the pack electrical parameter;
• providing the adjusted pack electrical parameter to a battery state estimation system;
• and
• generating an estimated battery state based on the adjusted pack electrical parameter.

A method of estimating the voltage of battery pack comprising a plurality of subdivisions, the method comprising:

• determining a plurality of subdivision electrical parameters, each subdivision electrical parameter of the plurality of electrical parameters being associated with one of the plurality of subdivisions;
• identifying a subdivision satisfying a criterion based on the plurality of subdivision electrical parameters;
• providing the electrical parameter of the identified subdivision a battery state estimation system;
• generating an estimated state of charge based on the electrical parameter of the identified subdivision;
• and
• restricting discharge from the battery pack when the estimated state of charge falls below a threshold.