Electric vehicle battery systems with exchangeable parallel electric vehicle battery modules

A method of operating an electric vehicle battery system, comprising:

• monitoring a first current level using a first current sensor at a first current path between a first battery and an electric vehicle battery module output node;
• balancing the first current level at the first current path using a first balancing circuit in electrical communication with the first current path based upon the first current level, where the first current sensor, first battery and first balancing circuit comprises a first electric vehicle battery module;
• monitoring a second current level using a second current sensor at a second current path between a second battery and the electric vehicle battery module output node;
• and
• balancing the second current level at the second current path using a second balancing circuit in electrical communication with the second current path based upon the second current level, where the second current sensor, second battery and second balancing circuit comprises a second electric vehicle battery module,
• wherein the first electric vehicle battery module and the second electric vehicle battery module are connected in parallel with each other at the electric vehicle battery module output node,
• wherein balancing the first current level at the first current path is performed using the first balancing circuit configured to disconnect the first battery from the electric vehicle battery module output node when the first electric vehicle battery module is about to be removed from the electric vehicle battery system, and
• wherein balancing the second current level at the second current path is performed using the second balancing circuit configured to disconnect the second battery from the electric vehicle battery module output node when the second electric vehicle battery module is about to be removed from the electric vehicle battery system.

An electric vehicle battery system, comprising:

• a plurality of electric vehicle battery modules connected in parallel, each electric vehicle battery module comprising:
• a battery;
• a balancing circuit in electrical communication with a current path from the battery to an electric vehicle battery module output node;
• and
• a current sensor in electromagnetic communication with the current path between the battery and the balancing circuit, the current sensor configured to sense a current level between the battery and the balancing circuit,
• wherein the balancing circuit is configured to balance the current level sensed by the current sensor of each electric vehicle battery module, and
• wherein the balancing circuit is configured to disconnect the battery from the electric vehicle battery module output node when the electric vehicle is shut off.