Battery Pack Capacity Adjustment via Periodic Cell Switching
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Solution Overview
Problem
Existing battery pack capacity adjustment systems face challenges in achieving uniform cell voltages due to errors in voltage comparison and discharge currents, leading to inconsistencies in capacity adjustment.
Innovation Solution
A battery pack capacity adjustment apparatus that includes multiple capacity adjustment circuits and a switching circuit to switch connections between cells and capacity adjustment circuits, canceling out errors in voltage comparison and discharge currents by periodically switching the connections between cells and bypass circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage comparison circuits and capacity adjustment circuits are used to adjust cell voltages to a reference level, then capacity adjustment can be performed, but errors in voltage comparison and discharge currents cause cell voltages to remain non-uniform
Solution Approach 1:
The patent applies periodic action by switching the connection between cells and bypass circuits at regular intervals. The switching circuit periodically connects and disconnects the bypass circuits during charging, allowing errors in voltage comparison and discharge currents to be canceled out over time through repeated cycles of adjustment and relaxation
Solution Approach 2:
The patent implements preliminary action by performing capacity adjustment during the charging process before the battery reaches full charge. The switching circuit is designed to activate bypass circuits during specific charging phases, allowing voltage equalization to occur proactively rather than correcting issues after they arise
2Manufacturing precision
If bypass circuits are connected to all cells, then voltage adjustment can be performed, but the complexity of the apparatus increases
Solution Approach 1:
The patent applies dynamics by making the bypass circuit connections dynamic rather than static. The switching circuit dynamically connects and disconnects bypass circuits based on real-time charging conditions and cell voltage states, allowing the system to adapt its configuration during operation rather than requiring all bypass circuits to be permanently connected
Solution Approach 2:
The switching circuit serves multiple functions: it controls the connection of bypass circuits, monitors cell voltages, and coordinates capacity adjustment timing. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby reducing overall system complexity while maintaining voltage uniformity
Data Source
AI summary
A capacity adjustment circuit provided in conjunction with each cell discharges the corresponding cell if the cell voltage is higher than a bypass operating voltage and, as a result, the extent of inconsistency among the voltages at the individual cells is minimized. A cell switching circuit switches the connections between the individual cells and the capacity adjustment circuits over predetermined time intervals.