Battery Control Unit Voltage Adjustment for Series Pack Reliability
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Solution Overview
Problem
In battery systems, uneven deterioration of batteries connected in series leads to premature charge/discharge termination, reducing overall capacity utilization and increasing the burden on deteriorated batteries, resulting in inefficient energy consumption.
Innovation Solution
A battery control unit with switching units and a control unit that disconnects deteriorated batteries from the series connection during charging or discharging, adjusting the charge/discharge end voltages to reduce the depth of discharge and vary the voltage ranges based on battery condition, allowing healthier batteries to fully utilize their capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all batteries are set to the same charge/discharge end voltage, then the charging or discharging can be stopped when any battery reaches the end voltage, but the burden of the deteriorated battery increases and variations of deterioration become larger
Solution Approach 1:
The patent applies local quality by setting different charge end voltages and discharge end voltages for different batteries based on their individual deterioration states. Specifically, deteriorated batteries are assigned a lower charge end voltage and a higher discharge end voltage compared to non-deteriorated batteries, creating localized parameter adjustments that account for individual battery conditions and reduce deterioration variations.
Solution Approach 2:
The patent changes the voltage parameters (charge end voltage and discharge end voltage) based on the deterioration state of each battery. By dynamically adjusting these parameters - lowering charge end voltage and raising discharge end voltage for deteriorated batteries - the system adapts to varying battery conditions and prevents further deterioration imbalance.
2Reliability
If the charge/discharge end voltage is set to stop charging or discharging when any battery reaches it, then battery safety is ensured, but the capacity of the batteries cannot be entirely consumed
Solution Approach 1:
The patent enables different batteries to have different charge end voltages and discharge end voltages according to their deterioration states. This allows healthier batteries to operate at higher voltage ranges and contribute more to energy capacity, while deteriorated batteries operate at adjusted voltage ranges, thereby fully utilizing the remaining capacity of each battery without compromising safety.
Solution Approach 2:
The patent dynamically adjusts the charge end voltage and discharge end voltage based on the real-time deterioration state of each battery. This dynamic parameter adjustment allows the system to optimize energy capacity utilization by adapting voltage thresholds to individual battery conditions, ensuring that each battery contributes according to its health status.
Data Source
AI summary
A plurality of switching units is provided for each of a plurality of batteries. The switching units switch between a connected state where the corresponding battery is connected in series with another battery and a non-connected state where series connection between the corresponding battery and the other battery is disconnected. A control unit controls the switching unit corresponding to the battery to switch to the non-connected state when it is determined that the corresponding battery reaches a charge end voltage during charging or a discharge end voltage during discharging. The control unit changes the charge end voltage such that the charge end voltage of the battery deteriorated is lower than the charge end voltage of the battery not deteriorated, or changes the discharge end voltage such that the discharge end voltage of the battery deteriorated is higher than the discharge end voltage of the battery not deteriorated.