Battery Pack Power Supply Circuit for Low-SOC Display Drain
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Solution Overview
Problem
Existing battery packs with LED displays for indicating state of charge (SOC) consume current continuously when coupled to a charger, leading to repeated charging and discharging of the battery, which accelerates cell degradation and reduces battery life.
Innovation Solution
A battery pack design that includes a charge switch, discharge switch, battery control circuit, and power supply circuit, where the charger directly supplies power to the battery control circuit and LED display only when the battery cell is coupled to the charger, minimizing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED display continuously operates to display state of charge, then the user can monitor battery status, but current consumption increases causing repeated charging-discharging cycles and battery degradation
Solution Approach 1:
The LED display operates periodically rather than continuously. It activates only at specific moments (when charging is complete or when requested by the user) rather than running constantly, thereby reducing current consumption and preventing unnecessary battery cycling while still providing essential status information.
Solution Approach 2:
The system uses the charging process itself to power the display during charging operations, and only draws from the battery when necessary. The power supply circuit intelligently routes power from the charger during charging to minimize battery discharge, making the system self-sufficient during its primary operating mode.
2Measurement precision
If the battery control circuit continuously monitors battery status, then accurate state of charge information is available, but current consumption increases leading to battery degradation
Solution Approach 1:
The battery control circuit performs monitoring at periodic intervals rather than continuously. It checks battery status at key moments such as during charging phases and when display updates are needed, maintaining measurement accuracy while significantly reducing current consumption by keeping the monitoring function dormant between measurements.
3Ease of operation
If the battery operates in standby mode with display and control circuit active, then the system is ready for immediate use, but current consumption causes repeated charging-discharging cycles
Solution Approach 1:
The system transitions from continuous standby operation to periodic activation. The display and control circuit remain in low-power sleep mode and only activate periodically when needed (charging complete, user request, or error condition), maintaining operational readiness when required while dramatically reducing current consumption during idle periods to prevent battery degradation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design minimizes current consumption when the battery is fully charged and not in use, thereby preventing unnecessary charging and discharging cycles, which extends the battery's lifespan and reduces degradation.
Implementation Method 1
a voltage maintaining diode of which an anode may be coupled to the charger positive terminal and a cathode may be coupled to the charge switch so that a voltage of the charger is higher than a voltage of the battery cell
Implementation Method 2
a light-emitting diode (LED) display configured to display an amount of charge of the battery cell in response to a control signal of the battery control circuit
Data Source
AI summary
A battery pack includes a charge switch coupled between a battery cell positive terminal and a charger positive terminal and between a pack positive terminal and the charger positive terminal, a discharge switch coupled between a battery cell negative terminal and a pack negative terminal and between a charger negative terminal and the pack negative terminal, a battery control circuit configured to control the charge switch and the discharge switch, and a power supply circuit coupled between the charger positive terminal and the battery control circuit, wherein the power supply circuit directly supplies power to the battery control circuit when a battery cell is coupled to a charger.