Battery Pack Power Supply Circuit for Self-Starting Controller Voltage
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Solution Overview
Problem
Existing energy storage systems face challenges in efficiently supplying operating power to battery pack controllers using internal battery voltage and DC/DC converters, particularly when initial power is not applied, and require costly AC system power sources for switched mode power supplies.
Innovation Solution
A power supply system for battery packs incorporating a first high-voltage battery, a second battery, a DC/DC converter, a controller, a relay, and manual and controlled switches and diodes to selectively transmit voltage from either battery to the DC/DC converter and controller, allowing operation without initial power input and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC system power sources are used for switched mode power supplies in energy storage systems, then power supply reliability is improved, but manufacturing cost increases
Solution Approach 1:
The system uses its own internal battery voltage to power the DC/DC converter and controller through the manual switch, eliminating the need for external AC power sources. The battery pack serves itself by providing both the energy storage function and the auxiliary power function for its own control systems.
Solution Approach 2:
The invention extracts the auxiliary power supply function from the main battery pack system by using a separate second battery and DC/DC converter configuration. This allows the high-voltage battery to be used solely for energy storage while a dedicated low-voltage battery handles control power requirements.
2Ease of manufacture
If internal battery voltage is used to supply control voltage without initial power input, then manufacturing cost is reduced, but power supply capability deteriorates when no initial power is applied
Solution Approach 1:
The manual switch is configured to be in a closed state before system operation begins, allowing the second battery to immediately supply power to the DC/DC converter and controller without requiring any initial power input or activation sequence. This preliminary configuration ensures the system can start up autonomously.
Solution Approach 2:
The DC/DC converter acts as an intermediary device that converts the voltage from the second battery into the appropriate control voltage levels needed by the controller and other low-voltage components, enabling cost-effective internal power supply while maintaining proper voltage levels for all control electronics.
3Ease of operation
If manual switch is used to control power flow from second battery, then operational simplicity is improved, but control flexibility deteriorates
Solution Approach 1:
The system merges the manual switch control with automatic controller management, where the manual switch provides simple on/off capability while the controller automatically manages power distribution, voltage conversion, and system operation. This combination maintains operational simplicity while adding control flexibility through intelligent automation.
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
Enables cost-effective manufacturing by using internal battery voltage and DC/DC converters to supply control voltage to battery packs, while reducing power consumption and maintaining charging voltage for the second battery, thus addressing the inefficiencies of traditional systems.
Implementation Method 1
a DC/DC converter for converting a first voltage output by the first battery into a second voltage
Implementation Method 2
a relay connected between the first battery and an input terminal of the DC/DC converter and controlling an electrical connection between the first battery and the input terminal of the DC/DC converter
Data Source
AI summary
A power supply of a battery pack, including a first battery, a second battery, a DC/DC converter for converting a first voltage output by the first battery into a second voltage, a controller for using the second voltage as an operation voltage, a relay connected between the first battery and an input terminal of the DC/DC converter and controlling an electrical connection between the first battery and the input terminal of the DC/DC converter, a first switch connected between an output terminal of the DC/DC converter and a coil of the relay and controlling an electrical connection between the output terminal of the DC/DC converter and the coil, and a second switch connected between the second battery and the coil and controlling an electrical connection between the second battery and the coil.