Battery management systems for energy storage devices

A method comprising:

• (a) providing (1) an electrochemical cell comprising, a negative electrode, an electrolyte, a positive electrode, (2) a housing disposed around the negative electrode, the electrolyte, and the positive electrode, and (3) a seal connected to the housing, wherein at least one of the negative electrode, the electrolyte, and the positive electrode is in an at least partially liquid state at an operating temperature of the electrochemical cell that is at least about 250° C., wherein the housing and the seal isolate the negative electrode, the electrolyte, and the positive electrode from an environment comprising an atmosphere comprising nitrogen external to the housing and the seal, and wherein the seal electrically isolates the positive electrode and the negative electrode from one another;
• (b) monitoring the electrochemical cell for an electrical signature from within the electrochemical cell to determine (i) an exposure of at least one of the positive electrode, the electrolyte, and the negative electrode in the electrochemical cell to the environment, and (ii) a breach of the seal;
• and
• (c) in response to the electrical signature, inactivating the electrochemical cell, cooling the electrochemical cell, discharging the electrochemical cell, or notifying a system operator.