Battery Module Discharge Circuit for Fast Charging Durability
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Solution Overview
Problem
Quick-charging technologies lead to excessive electrolyte consumption and rapid expansion of battery electrodes, resulting in reduced ion density, increased impedance, shortened charging time, and poor durability, which affects battery life.
Innovation Solution
A battery module with a discharge circuit connected in parallel to the positive and negative electrodes, which discharges the battery during charging to slow down electrolyte consumption and electrode expansion, preventing the formation of a gate and ensuring battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quick-charging technology is used to increase charging current, then charging speed is improved, but electrolyte consumption increases and electrode expansion accelerates
Solution Approach 1:
The patent implements periodic charging and discharging cycles during the charging process. The discharge circuit is periodically activated to discharge the battery at specific intervals, creating a periodic action pattern. This periodic discharge prevents continuous electrolyte consumption and electrode expansion that would occur with constant high-current charging, thereby resolving the contradiction between charging speed and electrolyte consumption.
Solution Approach 2:
The patent dynamically adjusts charging parameters by introducing a discharge circuit that can modulate the net charging current. By changing the discharge current parameter periodically or based on battery state, the system optimizes the balance between maintaining high charging speed and reducing electrolyte consumption. The control unit adjusts discharge parameters to prevent gate formation while preserving fast charging benefits.
2Loss of time
If high charging current is applied, then charging time is reduced, but electrode expansion speeds up and battery durability decreases
Solution Approach 1:
The discharge circuit operates in periodic cycles during charging, creating intervals of reduced net current stress on the electrodes. This periodic action allows the electrode structure to partially recover between high-current charging pulses, preventing cumulative expansion damage and maintaining battery durability while still achieving relatively fast charging overall.
Solution Approach 2:
The discharge circuit provides a preliminary counter-action to electrode expansion by actively discharging the battery during charging. This anti-action occurs concurrently with the charging process, preventing the gate formation that would otherwise occur from unopposed high-current charging, thereby protecting battery durability without significantly extending charging time.
3Productivity
If continuous charging is performed, then charging efficiency is maintained, but gate formation occurs and battery capacity reduces
Solution Approach 1:
The system implements periodic discharge intervals during charging, creating a rhythm of charge-discharge-charge cycles. This periodic action prevents the continuous stress that leads to gate formation while maintaining overall charging efficiency. The discharge phases are timed to coincide with critical periods when gate formation risk is highest, protecting battery capacity without significantly reducing net charging efficiency.
Solution Approach 2:
The discharge circuit operates continuously or near-continuously during the charging process, providing ongoing protection against gate formation. Rather than intermittent discharge pulses, the system maintains a continuous counter-balancing discharge action that continuously prevents electrolyte depletion and electrode expansion, ensuring battery capacity is preserved throughout the entire charging duration.
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
The solution effectively slows down electrolyte consumption and electrode expansion, maintaining battery capacity and extending battery life by preventing gate formation during charging.
Implementation Method 1
the electrolyte solution of the positive electrode of the battery may be excessively consumed
Implementation Method 2
the positive and negative electrodes may absorb and release ions in an electrolyte, thereby expanding and contracting themselves
Implementation Method 3
rapidly reduce the density of ions or electrons in the electrolyte at the positive and negative electrodes to form a gate finally
Data Source
AI summary
A battery module includes a first battery and a discharge circuit. The discharge circuit is connected in parallel to a positive electrode and a negative electrode of the first battery. The discharge circuit is configured to discharge the first battery according to a control signal during charging of the first battery.