Battery Charging Current Control for Fast Charging and Cycle Life
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Solution Overview
Problem
Existing battery charging methods primarily focus on protecting the anode to prevent lithium precipitation, neglecting the cathode and electrolyte solution, which can impact the battery's cycle life.
Innovation Solution
A method that determines a charging current to protect both the anode and cathode by calculating the maximum current for each component, using lithium-precipitation charging rates and anode potentials for the anode, and cathodic polarization impedance for the cathode, to avoid lithium precipitation and side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast charging is used to shorten charging time, then charging speed is improved, but the battery cycle life is reduced due to lack of cathode and electrolyte protection
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring battery state (charge-discharge cycles, temperature, state of charge) and adjusting the charging current limit accordingly. It calculates charging current limits based on real-time battery conditions and historical cycling data, ensuring that fast charging is applied safely within the battery's current capacity while protecting long-term cycle life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures long cycle life and fast charging capabilities by balancing anode and cathode protection, reducing capacity decay and shortening charging time.
Implementation Method 1
determining a limit current only from the anode protection perspective cannot protect materials such as a cathode and an electrolyte solution, and may have a great impact on cycle life of the battery
Implementation Method 2
the second maximum charging current Imax2 is a maximum current that controls side reactions of a cathode material and an electrolyte solution of the battery
Data Source
AI summary
A method of a charging battery includes the following steps: charging the battery with a first charging current in an nth charge and discharge cycle, where n is an integer greater than or equal to 0; and charging the battery with a second charging current in an (n+m)th charge and discharge cycle, where m is a preset integer greater than or equal to 1, Ib=k1×Ic, 0.5≤k1≤1, and Ic is a third charging current, where the third charging current is a smaller one of a first maximum charging current and a second maximum charging current in a same state of charge. This application further provides an electronic apparatus and a storage medium.