Battery Control Device Dynamic Hysteresis Width Adjustment
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Solution Overview
Problem
Secondary batteries, such as lithium ion batteries, deteriorate when maintained near full charge or over-discharge states, leading to reduced capacity and increased deterioration, which existing charging methods fail to effectively mitigate.
Innovation Solution
A battery control device that measures voltage and initiates charging until a second reference value is reached, with an adjustment unit modifying the hysteresis width based on the battery's degree of deterioration to avoid fully charged or over-discharged states, using a state of health (SOH) calculation and reference tables for optimal charging control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charging is performed until full charge voltage is reached, then battery capacity is maximized, but battery deterioration accelerates
Solution Approach 1:
The patent applies dynamics by making the charging termination voltage dynamic rather than fixed. The control unit adjusts the termination voltage based on the battery's state of health (SOH), which changes over time. For batteries with lower SOH, the termination voltage is reduced to avoid overcharging and excessive deterioration, while maintaining sufficient capacity utilization. This dynamic adjustment resolves the contradiction between maximizing capacity and preventing deterioration.
Solution Approach 2:
The patent changes the parameter of charging termination voltage based on battery condition. Instead of using a constant full charge voltage threshold, the system modifies this parameter according to measured SOH values. The adjustment unit calculates appropriate termination voltages that balance capacity utilization with deterioration prevention, directly addressing the technical contradiction through parameter optimization.
2Reliability
If charging threshold is lowered to avoid full charge state, then battery deterioration is suppressed, but battery capacity utilization decreases
Solution Approach 1:
The system dynamically adjusts the charging threshold based on SOH measurements. For healthy batteries with high SOH, the threshold remains closer to full charge to maximize capacity utilization. For deteriorated batteries with low SOH, the threshold is appropriately lowered to prevent further deterioration. This dynamic approach ensures optimal balance between capacity utilization and deterioration suppression for each battery's current state.
Solution Approach 2:
The patent optimizes the charging threshold parameter according to battery condition. The adjustment unit calculates specific termination voltages that maintain sufficient capacity utilization while preventing excessive deterioration. This parameter optimization ensures that the charging threshold is neither too high (causing deterioration) nor too low (reducing capacity utilization), but rather adaptively set for each battery's SOH level.
3Ease of operation
If fixed hysteresis width is used for charging control, then control simplicity is maintained, but adaptability to battery deterioration decreases
Solution Approach 1:
The patent transitions from a static hysteresis width to a dynamic one that adapts to battery deterioration. The control unit modifies the hysteresis width based on measured SOH values, allowing the charging control to adapt to changing battery conditions. This maintains operational simplicity through automated adjustment while significantly improving adaptability to deterioration.
Solution Approach 2:
The system changes the hysteresis width parameter based on battery condition. Instead of using a fixed value, the adjustment unit calculates appropriate hysteresis widths according to SOH measurements. This parameter adaptation maintains control simplicity through automated calculation while enabling the system to adapt to various stages of battery deterioration, resolving the contradiction between simplicity and adaptability.
Data Source
AI summary
A battery control device (100) includes: a measurement unit (110) that measures a voltage of a secondary battery; a control unit (120) that initiates a charging process of performing charging until the voltage of the secondary battery reaches a second reference value greater than a first reference value in a case where a voltage measured by the measurement unit (110) is less than the first reference value; and an adjustment unit (130) that receives a degree of deterioration of the secondary battery as first adjustment information that becomes a reference for adjustment of a hysteresis width that is determined on the basis of the first reference value and the second reference value, and adjusts the hysteresis width on the basis of the first adjustment information that is received.