Method and system for optimal charging process of lithium-ion batteries to mitigate cell degradation in real time
A method and system for optimizing the charging process of lithium-ion batteries by utilizing a determined parameter as a cell degradation indicator are disclosed. The system and method enable intelligent charging, which may involve integrating a controller that adjusts the charging current in real-time based on the cell degradation indicator, calculated from probing the battery. This approach has various possible benefits to which the method and system may be tuned including extending battery lifespan, charge timing, and safety.
1 . A method of charging a battery comprising:
applying a first charging current to the battery at a first state of charge; and
altering the first charging current to a second charging current at a second state of charge,
wherein the second charging current is based on a Lyapunov exponent correlated to anode overpotential meeting a threshold level indicative of electrode plating.
2 . The method of claim 1 , wherein the threshold level indicative of electrode plating is a Lyapunov exponent value of 0 or a Lyapunov exponent value less than 0.
3 . The method of claim 1 , wherein the second charging current is further based on a battery temperature.
4 . The method of claim 1 , wherein the first charging current and the second charging current are dynamically selected based on real-time feedback from the battery.
5 . The method of claim 1 , wherein a change between the first state of charge and the second state of charge is a fixed state of charge interval.
6 . The method of claim 1 , wherein the first charging current and the second charging current are charging steps within a multi-step charging protocol.
7 . The method of claim 6 , further comprising altering the second charging current to a third charging current at a third state of charge, wherein the third charging current is based on the Lyapunov exponent approaching the threshold level indicative of electrode plating.
8 . The method of claim 7 , wherein the third charging current is less than the second current.
9 . A method of charging a battery comprising:
applying a first charging current to the battery; and
altering the first charging current to a second charging current, different from the first charging current,
wherein altering the first charging current to the second charging current is based on a Lyapunov exponent correlated to anode overpotential meeting a threshold level indicative of electrode plating.
10 . The method of claim 9 , wherein the threshold level indicative of electrode plating is a Lyapunov exponent value of 0 or a Lyapunov exponent value less than 0.
11 . The method of claim 9 , wherein the second charging current is further based on a battery temperature.
12 . The method of claim 9 , wherein the first charging current and the second charging current are dynamically selected based on real-time feedback from the battery.
13 . The method of claim 9 , wherein the first charging current and the second charging current are charging steps within a multi-step charging protocol.
14 . The method of claim 13 , further comprising altering the second charging current to a third charging current different from the first and second charging current, wherein the third charging current is based on the Lyapunov exponent approaching the threshold level indicative of electrode plating.
15 . The method of claim 14 , wherein the third charging current is less than the second charging current.