Battery Pack Power Supply With Relay Startup From Internal Batteries
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Solution Overview
Problem
Existing energy storage systems face challenges in supplying control voltage to battery packs using internal power sources and DC/DC converters without initial power voltage, often requiring costly AC system installations and manual switch operations.
Innovation Solution
A power supply system utilizing a high-voltage battery module, a DC/DC converter, a relay, and two switches (one manual) to control electrical connections, enabling operation of the DC/DC converter and battery management system using internal battery voltage, with a diode circuit to manage voltage transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC system power source is used to supply control voltage, then power supply reliability is improved, but installation cost increases
Solution Approach 1:
The battery pack supplies its own control voltage using internal power sources (first battery and second battery) without requiring external AC power source installation. The DC/DC converter converts voltage from the first battery, and the second battery provides initial power for the relay coil, enabling the system to be self-sufficient and eliminate costly AC infrastructure installation.
2Ease of manufacture
If internal power source and DC/DC converter are used to supply control voltage, then installation cost is reduced, but device complexity increases
Solution Approach 1:
The first battery serves multiple functions: it provides power for the DC/DC converter during normal operation and can be recharged from the second battery when voltage drops. The second battery serves dual purposes: providing initial power for the relay coil to close the circuit and charging the first battery when needed. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The DC/DC converter acts as an intermediary that converts voltage from the first battery to the appropriate level for the controller. The relay serves as an intermediary switch controlled by the second battery to enable or disable power flow from the first battery to the DC/DC converter. These intermediary components manage the complexity by providing controlled interfaces between different voltage sources and the controller.
3Reliability
If manual switch operation is required to turn on the power supply, then ease of operation is reduced, but reliability during initial startup is improved
Solution Approach 1:
The system automatically starts up without requiring manual intervention. When the second battery has sufficient voltage, it automatically energizes the relay coil to close the relay switch, enabling power flow from the first battery to the DC/DC converter, which then supplies power to the controller. The controller subsequently charges the second battery and maintains continuous operation without user action.
Solution Approach 2:
The second battery is pre-charged before system operation to provide the initial power needed to close the relay circuit. This preliminary charging ensures that when the system is activated, the relay can immediately close to enable power flow, eliminating the need for manual switch operation and ensuring reliable automatic startup.
4Use of energy by moving object
If DC/DC converter is driven without initial power voltage, then power consumption is reduced, but difficulty of detecting and measuring increases
Solution Approach 1:
The second battery is pre-charged to provide initial power voltage before the DC/DC converter begins operation. This preliminary power enables the relay to close and establishes the power flow path to the DC/DC converter input terminals, allowing the converter to start without requiring external initial power voltage while maintaining measurable and detectable operating conditions.
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 efficient and cost-effective supply of control voltage to battery packs using internal power sources, reducing power consumption and maintaining voltage supply during initial power loss, while allowing manual control for emergency operations.
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
Implementation Method 3
a diode connected between the first switch and the second battery and configured to transmit an output voltage of the DC/DC converter as a charging voltage of the second battery
Data Source
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AI summary
The present disclosure relates to a power supply (100) of a battery pack. The power supply (100) may include: a first battery (120); a second battery (130); a DC/DC converter (150) for converting a first voltage output by the first battery (120) into a second voltage; a controller (110) for using the second voltage as an operation voltage; a relay (140) connected between the first battery (120) and an input terminal of the DC/DC converter (150) and controlling an electrical connection between the first battery (120) and the input terminal of the DC/DC converter (150); a first switch (SW1) connected between an output terminal of the DC/DC converter (150) and a coil (141) of the relay (140) and controlling an electrical connection between the output terminal of the DC/DC converter (150) and the coil (141); and a second switch (SW2) connected between the second battery (130) and the coil (141) and controlling an electrical connection between the second battery (130) and the coil (141).