Electrolyte fluid metering device for lithium cells
AssigneeRobert Bosch GmbH
InventorsMarcus Wegner, Matthias Mueller, Martin Tenzer
Life of this patent
Estimating the term…
Abstract
A battery system includes at least one lithium cell with an electrolyte having at least one polymer which is configured to be impregnated with an electrolyte fluid. In order to increase the capacity, the life and the safety of the battery system, the battery system further includes at least one electrolyte fluid metering device, by which at least one component of the electrolyte fluid can be supplied to the lithium cell and/or by which electrolyte fluid can be discharged from the lithium cell.
Claims17
A battery system, comprising:
- at least one lithium cell with an electrolyte, the electrolyte including at least one polymer configured to be impregnated with an electrolyte fluid;
- and
- at least one electrolyte fluid metering device including a control device electrically connected to the at least one lithium cell, a reservoir fluidically connected to the at least one lithium cell and containing at least a portion of the electrolyte fluid, and a movable wall located within the reservoir, the control device configured to generate an electronic supply signal configured to cause the movable wall to move within the reservoir to supply the electrolyte fluid into the at least one lithium cell from the reservoir and to generate an electronic discharge signal configured to cause the movable wall to move within the reservoir to discharge the electrolyte fluid from the at least one lithium cell into the reservoir.
An electrolyte fluid metering device for a battery system, the electrolyte fluid metering device comprising:
- at least one electrolyte fluid component reservoir including a movable wall configured to vary a volume of the electrolyte fluid component reservoir;
- at least one measuring device operably connected to the battery system and configured to generate a measurement signal;
- and
- a control device electrically connected to the at least one measuring device, the control device configured to cause the moveable wall to move relative to the reservoir to supply electrolyte fluid from the reservoir into the battery system based on the measurement signal and to cause the movable wall to move relative to the reservoir to discharge electrolyte fluid from the battery system into the reservoir based on the measurement signal.
A method for operating a battery system, comprising:
- ascertaining an internal cell resistance of a lithium cell;
- determining whether the internal cell resistance ascertained lies above a predetermined upper limit value or below a predetermined lower limit value;
- supplying electrolyte fluid to the lithium cell from a reservoir fluidically coupled to the lithium cell when the internal cell resistance ascertained is higher than the predetermined upper limit value by moving a movable wall located within the reservoir in a first direction to supply electrolyte fluid from the reservoir into the lithium cell;
- and
- removing electrolyte fluid from the lithium cell when the internal cell resistance ascertained is lower than the predetermined lower limit value by moving the movable wall in a second direction to discharge electrolyte fluid from the lithium cell into the reservoir.
Dependencies are inferred from the claim text.