Techniques for forming thermally resilient energy storage devices and a battery thermal management system implementing same
AssigneeSouthwest Research Institute
InventorsBapiraju Surampudi, Benjamin Furman
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Abstract
In general, the present disclosure is directed to forming lithium ion battery (LIB) cells with structure and chemistry that achieves formation of a solid electrolyte interphase (SEI) layer that allows for operating in relatively high ambient temperature environments, e.g., up to and exceeding 60° C., while significantly reducing self-discharge amounts, e.g., relative to other LIB cells formed with SEI layers measuring about 1-2 nanometers in thickness. For example, one non-limiting embodiment of the present disclosure enables a self-discharge amount for a LIB cell of 10% or less over a four (4) week period of time when operating at an ambient temperature of 60 degrees Celsius.
Claims22
A method for forming a lithium ion battery (LIB) cell that limits self-discharge to a target self-discharge amount over a period of time T when operating within a predetermined ambient temperature, the method comprising:
- receiving, by a controller, the predetermined ambient temperature for operation of the LIB cell, the predetermined ambient temperature being greater than 35 degrees Celsius;
- determining, by the controller, a layer thickness value for a formed solid electrolyte interphase (SEI) layer of the LIB cell when executing charge-discharge cycles at the predetermined ambient temperature, the determined layer thickness value of the formed SEI layer to maintain self-discharge of the LIB cell at or below the target self-discharge amount over the period of time T;
- and
- forming a LIB cell with an SEI layer based on the determined layer thickness value to maintain self-discharge of the formed LIB cell at or below the target self-discharge amount over the period of time T when operating within the predetermined ambient temperature.
A lithium ion battery (LIB) temperature control system, the LIB temperature control system comprising:
- a first battery package, the first battery package having a housing defined by at least first and second plates that form a cavity therebetween for holding at least one battery cell, the first plate having a heatsink mating surface for thermally coupling to a heatsink;
- a first lithium ion battery (LIB) cell disposed within the cavity of the first battery package, the first LIB cell having a self-discharge amount of less than 10% over at least a four week period of operation at a target ambient temperature of at least 35 degrees Celsius based at least in part on a layer thickness of a solid electrolyte interphase layer of the first LIB cell and a resulting corrosive current;
- and
- a temperature control arrangement comprising a cooling plate with a cold-side thermally coupled to the heatsink mating surface and a hot-side thermally coupled to a heat exchanger;
- and wherein the temperature control arrangement draws an operating current from at least the first LIB cell to maintain an ambient temperature within the first battery package at or below the target ambient temperature.
A battery temperature management system (BTMS) comprising:
- a first battery package, the first battery package having a housing defined by at least first and second plates that couple together to form a cavity therebetween for holding at least one battery cell, the first plate having a heatsink mating surface external to the cavity for thermally coupling to a heatsink;
- and
- a first boron nitride nanosheet (BNN) disposed on the heatsink mating surface to increase passive heat transfer from the first battery package to the heatsink.
Dependencies are inferred from the claim text.