Battery Module Charging Control via Internal Pressure Monitoring
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Solution Overview
Problem
Existing battery modules have a short life for cycle charging and discharging due to rapid lithium ion insertion and extraction, leading to increased pressure, electrolyte redistribution, and side reactions, which deteriorate the battery and reduce its lifespan.
Innovation Solution
A method and system that acquire internal pressure values of the battery module, determine a target pressure threshold range, and adjust the charge cutoff voltage accordingly to control the charging process, using pressure sensors and predefined correspondence relationships to avoid pressure-induced deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid charging and discharging is performed to meet user usage requirements, then charging speed is improved, but internal pressure increases causing electrolyte redistribution and side reactions that reduce battery life
Solution Approach 1:
The patent implements dynamic adjustment of charge cutoff voltage based on real-time internal pressure monitoring. The charge cutoff voltage is not fixed but varies dynamically according to the battery's internal pressure state, allowing the system to adapt charging parameters to current conditions and prevent pressure-induced deterioration while maintaining efficient charging.
Solution Approach 2:
The patent employs a feedback mechanism where internal pressure is continuously monitored during charging and discharging cycles. The pressure information feeds back to the control system, which then adjusts the charge cutoff voltage accordingly. This closed-loop feedback ensures that charging parameters are optimized based on actual battery state, preventing harmful side reactions while maintaining good charging performance.
2Productivity
If charge cutoff voltage is increased to improve charging efficiency, then charging speed is improved, but internal pressure increases leading to squeezing effects and electrolyte redistribution
Solution Approach 1:
The patent makes the charge cutoff voltage dynamic rather than fixed. Based on real-time internal pressure measurements, the system adjusts the charge cutoff voltage to appropriate levels. When internal pressure is high, the charge cutoff voltage is reduced to prevent further pressure increase; when pressure is acceptable, higher charging efficiency can be achieved. This dynamic approach balances charging efficiency with pressure control.
Solution Approach 2:
The patent changes the charge cutoff voltage parameter based on internal pressure conditions. Instead of using a single fixed voltage threshold, the system modifies this critical parameter according to the battery's internal pressure state, thereby optimizing the balance between charging efficiency and preventing pressure-induced damage to the battery structure and electrolyte distribution.
3Device complexity
If fixed charge cutoff voltage is used to simplify control, then device complexity is reduced, but battery life is shortened due to pressure-induced side reactions
Solution Approach 1:
The patent introduces a feedback-based control mechanism that monitors internal pressure and adjusts charge cutoff voltage accordingly. While this increases control system complexity compared to fixed voltage control, it dramatically improves battery cycle life by preventing pressure-induced side reactions. The feedback mechanism ensures that charging parameters are continuously optimized based on actual battery state.
Solution Approach 2:
The patent enables the battery system to self-regulate its charging parameters based on its own internal state. The internal pressure monitoring and automatic adjustment of charge cutoff voltage allow the battery to protect itself from damaging conditions without requiring complex external intervention, thereby extending its own life through intelligent self-management.
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 significantly lengthens the cycle life of battery modules by adjusting charge cutoff voltages based on internal pressure, reducing the risk of side reactions and prolonging the battery's charging capacity.
Implementation Method 1
at least one pressure sensor provided on each battery cell in the battery module and/or between two adjacent battery cells in the battery module, and configured to sense an internal pressure of the battery module
Data Source
AI summary
A method, an apparatus and a system for controlling charging of a battery module are provided in the present disclosure. The method for controlling charging of the battery module may include: acquiring an internal pressure value of the battery module; determining a target pressure threshold range to which the acquired internal pressure value of the battery module belongs, based on a plurality of predefined pressure threshold ranges; obtaining a target charge cutoff voltage corresponding to the target pressure threshold range, based on a correspondence relationship between a plurality of predefined charge cutoff voltage and the plurality of predefined pressure threshold ranges; and controlling the battery module to be charged based on the obtained target charge cutoff voltage.