Battery Control Device for Cell Voltage Equalization
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Solution Overview
Problem
Existing battery control devices for hybrid electric-internal combustion vehicles (HEVs) face challenges in maintaining battery equalization while preventing the on-vehicle low-voltage battery from discharging completely, which is essential for starting the engine, as they rely on power from the low-voltage battery during equalization processes, leading to inefficient energy regeneration and potential engine failure.
Innovation Solution
A battery control device that includes a state detecting means to monitor the high-voltage battery, an equalizing means to balance unit cell voltages, and a control means that cuts power supply to the state detecting circuit after ignition switch-off, allowing the equalizing means to operate using high-voltage battery power, thereby reducing low-voltage battery discharge and ensuring secure equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the low-voltage battery supplies power to detection circuits and equalizing device simultaneously, then comprehensive monitoring is achieved, but the battery undergoes excess discharge
Solution Approach 1:
The patent implements periodic or conditional power supply to detection circuits based on operational requirements. Rather than continuously powering all detection functions, the system activates detection circuits only when needed during specific operational phases, reducing overall energy consumption from the low-voltage battery while maintaining necessary monitoring capabilities during critical operations.
Data Source
AI summary
The battery control device includes: a state detecting means which receives electric power from an on-vehicle low-voltage battery having a supply voltage lower than that of an on-vehicle high-voltage battery composed of a plurality of unit cells connected together in series and detects a state of the on-vehicle high-voltage battery to monitor the on-vehicle high-voltage battery; an equalizing means for equalizing a voltage of each unit cell; and a control means which receives electric power from the on-vehicle low-voltage battery and starts to control the equalizing means in response to turning-off of an ignition switch, wherein the control means cuts electric power supplied from the on-vehicle low-voltage battery to the state detecting means after the turning-off of the ignition switch and before the control means starts to control the equalizing means.