Battery Charge Control Voltage Adjustment for Power and Life Trade-off
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Solution Overview
Problem
Conventional charge control methods for secondary batteries, such as lithium-ion batteries, lead to increased deterioration when maintained in a fully charged state, resulting in decreased output as the battery's remaining capacity decreases.
Innovation Solution
A charge control apparatus and method that sets a charge termination voltage within a predetermined range between a voltage corresponding to a first maximum output value and full charge voltage, allowing for two output density maximum values, prioritizing either travel distance or battery life to manage charging and prevent excessive deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery is maintained in a fully charged state to maximize output, then the output power is improved, but the battery deterioration increases
Solution Approach 1:
The invention changes the charge termination voltage parameter from the conventional full charge voltage to a lower voltage corresponding to a remaining capacity of 10% to 30%. This parameter change allows the battery to operate in a voltage range that provides high output power while avoiding the deterioration caused by maintaining full charge state, thus resolving the contradiction between power output and battery reliability
2Duration of action of stationary object
If the voltage setting is reduced to avoid battery deterioration, then the battery life is improved, but the output power decreases
Solution Approach 1:
The invention identifies and utilizes a specific voltage range (corresponding to 10%-30% remaining capacity) where the battery exhibits both high output characteristics and reduced deterioration. By changing the charge termination voltage parameter to this optimal range, the invention simultaneously achieves extended battery life and maintained high output power, resolving the contradiction between duration and power
3Quantity of substance
If the charge termination voltage is set to full charge voltage, then the remaining capacity is maximized, but the battery deterioration increases
Solution Approach 1:
The invention changes the charge termination voltage parameter from full charge voltage to a lower voltage corresponding to 10% to 30% remaining capacity. This parameter change accepts a moderate reduction in remaining capacity as a trade-off to achieve significant reduction in battery deterioration, thus resolving the contradiction between quantity and reliability
Data Source
AI summary
A charge control apparatus includes a battery having a first maximum value, a minimum value, and a second maximum value of an output density, in an output characteristic indicating a relationship between a remaining capacity and the output density of the battery, the minimum value being on a lower remaining capacity side than the first maximum value and the second maximum value being on a lower remaining capacity side than the minimum value; and a charge control unit configured to stop charging the battery when a voltage of the battery reaches a charge termination voltage set in a predetermined setting range. The predetermined setting range is from a voltage corresponding to a remaining capacity associated with the first maximum value to a full charge voltage.