Active and passive battery pressure management
Provided herein are apparatuses and methods of useful for managing pressure in electrochemical devices. The methods and systems use inputs and combinations of inputs to predictively pressurize or depressurize a battery. The methods minimize energy losses from excessive battery pressure when the battery is not in use.
1. A container comprising:
at least one battery module, wherein the at least one battery module comprises: one or more electrochemical cells each comprising a lithium metal negative electrode or a thin film solid-state separator electrolyte, or both;
a pressure sensor and a compressible element, wherein the compressible element is a gas, liquid, or both a gas and a liquid, wherein the compressible element is configured to expand and contract; and
at least one controller;
wherein the pressure sensor and the compressible element are between an inner wall of the container and an outer wall of the one or more electrochemical cells, wherein the compressible element is in contact with both the inner wall of the container and the outer wall of at least one of the one or more electrochemical cells, and wherein:
the side of the inner wall opposite the side in contact with the compressible element is in contact with the lithium metal negative electrode or a thin film solid-state separator electrolyte;
the pressure sensor is in electrical communication with the at least one controller; and
the pressure sensor monitors pressure in the container and the compressible element is configured to maintain an isostatic pressure on the one or more electrochemical cells.
2. The container of claim 1 , wherein the one or more electrochemical cells share a solid-state separator electrolyte.
3. The container of claim 1 , wherein the compressible element is in electrical communication with the at least one controller.
4. The container of claim 1 , wherein the at least one battery module comprises the thin film solid-state separator electrolyte, wherein the thin film solid-state separator electrolyte comprises lithium-stuffed garnet.
5. The container of claim 4 , wherein the compressible element is configured to apply an isostatic pressure to the solid-state separator electrolyte in the one or more electrochemical cells.
6. An electric vehicle comprising the container of claim 1 .
7. A method for pressurizing or de-pressurizing a battery system comprising the following steps:
providing a container of claim 1 ;
determining a condition by sensing pressure of the battery cell;
calculating a current state of health (SOH) for the battery system based on the condition and battery metrics;
providing one or more comparison values; and
comparing the one or more comparison values to the current SOH to provide a comparison result; and
determining if a safety condition exists based on the comparison result;
applying a first pressure to the battery system if the comparison result is normal;
applying a second pressure if the comparison result is not normal and no safety conditions exist;
applying a third pressure if the comparison result is not normal and no safety condition exists, and maintenance is required; or
de-pressurizing the battery system if the comparison result is not normal and a safety condition exists.
8. The method of claim 7 , wherein calculating a current SOH comprises optimizing power performance wherein optimizing power performance comprises the steps of:
(i) determining a current pressure condition by sensing pressure of the battery cell;
(ii) comparing the current pressure condition with a threshold pressure value to provide a pressure comparison result;
(iii) determining whether a safety condition exists based on the pressure comparison result relative to the threshold pressure value;
(iv) determining whether the pressure comparison result is normal or not normal, and whether the normal or not normal condition further comprises a safety condition or no safety condition;
(v) applying a fourth pressure to the battery system if the pressure comparison result fails to exceed the threshold pressure value and is not normal and a safety condition does not exist;
(vi) depressurizing the battery system if the pressure comparison result exceeds the threshold pressure value and is not normal and a safety condition exists; or (vii) depressurizing the battery system if the pressure comparison result exceeds the threshold pressure value and is not normal.
9. The method of claim 7 , wherein calculating a current SOH comprises factoring in an existing pressure.
10. The method of claim 7 , wherein the battery metrics comprise voltage, OCV, voltage hysteresis, and impedance, or area-specific resistance (ASR), state-of-charge (SOC), battery history, and temperature.
11. The method of claim 10 , wherein the ASR is a DC or series resistance.
12. The method of claim 7 , further comprising changing the temperature of the battery system, comprising determining a temperature of a battery cell; and heating or cooling the battery cell.
13. The method of claim 7 , further comprising reducing power availability if the comparison result is not normal and a safety condition exists by communicating an instruction to the driver to reduce power; communicating a control message to a controller to reduce power; or communicating a control message to a controller to reduce pressure on the electrochemical cell.
14. The method of claim 7 , wherein the de-pressurizing results in a shutdown of the battery system.
15. The method of claim 14 , further comprising one or more compressible elements and further comprising sending instructions to at least one member selected from the group consisting of a driver, an OEM, and a maintenance operator; wherein the instructions are for actuating one or more compressible elements to depressurize the battery system.
16. The method of claim 7 , wherein applying the first pressure comprises sending a control message to at least one member selected from the group consisting of a driver, an OEM, a maintenance operator, an actuator, or a pressure transducer configured to apply pressure to the battery system.
17. The method of claim 7 , wherein the condition is one selected from the group consisting of normal, abnormal, safe, non-safe, and shutdown, and combinations thereof.
18. The method of claim 17 , wherein the condition is normal.
19. The method of claim 17 , wherein the condition is safe.
20. The method of claim 17 , wherein the condition is normal and safe.
21. The method of claim 17 , wherein the condition is normal and non-safe.
22. The method of claim 17 , wherein the condition is shutdown.
23. The method of claim 17 , wherein the condition is abnormal and shutdown.