Battery system, power supply system for electric railcars, and battery module

摘要

A battery system is configured by connecting a plurality of battery modules in series, and each of the plurality of battery modules is configured by stacking a plurality of unit batteries. A connecting terminal through which electricity is obtained is provided between a positive electrode terminal and a negative electrode terminal of at least one of the plurality of battery modules.

主权项

1. A battery system connected to an electrical load comprising:
a plurality of battery modules configured to be connected in series, each of the battery modules being configured by stacking a plurality of unit batteries between a positive electrode terminal and a negative electrode terminal such that the plurality of unit batteries are connected in series; and at least one connecting terminal provided between the positive electrode terminal and the negative electrode terminal of at least one of the plurality of battery modules, electricity being obtained through the at least one connecting terminal, the at least one connecting terminal having potential between potential of the positive electrode terminal and potential of the negative electrode terminal, wherein the plurality of battery modules include a first battery module and a second battery module different from each other, the connecting terminal is provided at the first battery module, the negative electrode terminal of the second battery module has the lowest potential among the negative electrode terminals of the plurality of respective battery modules, the negative electrode terminal of the second battery module is connected to the electrical load, and only one terminal selected from the positive electrode terminal and the at least one connecting terminal of the first battery module is connected to the electrical load such that an output voltage of the battery system is adjusted.