Battery Pack Reflux Circuit for Surge-Protected Discharge Switching
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Solution Overview
Problem
Existing battery pack configurations are insufficient in protecting the discharge control switch from surge voltage, particularly when connected to systems with long cables and high inductive loads, as they do not effectively manage surge currents generated by counter electromotive forces.
Innovation Solution
Incorporating a reflux diode configuration within the battery pack, where a switch unit and a first diode are connected in series, and a control unit outputs a reflux control signal to enable the reflux diode only during surge voltage generation, creating a reflux path to divert surge currents away from the discharge control switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflux diode is added to protect the discharge control switch from surge voltage, then the reliability of the discharge control switch is improved, but the device complexity increases
Solution Approach 1:
The reflux diode is pre-configured in the circuit but remains inactive during normal operation. The control unit activates the reflux diode only when surge voltage is detected, allowing the protective mechanism to be prepared in advance without continuously affecting circuit operation or adding permanent complexity to the active circuit path
Solution Approach 2:
The reflux diode protection mechanism is extracted as a separate, independently controllable component from the main discharge control circuit. This allows the reflux diode to be activated only when needed for surge protection, rather than being permanently integrated into the normal discharge control path, thereby minimizing its impact on overall device complexity
2Reliability
If the reflux diode is enabled continuously to protect against surge voltage, then the reliability of the discharge control switch is improved, but the energy loss increases
Solution Approach 1:
The reflux diode is activated periodically or intermittently based on surge voltage detection rather than continuously. The control unit monitors for surge conditions and activates the reflux diode only during these brief surge events, minimizing energy loss while maintaining protection reliability
Solution Approach 2:
The reflux diode activation is applied partially - only for the specific duration and conditions when surge voltage is detected. This partial activation provides sufficient protection during critical moments while avoiding continuous energy loss that would occur with constant activation
3Reliability
If a reflux diode configuration is added to the battery pack, then the protection against surge voltage is improved, but the manufacturing complexity increases
Solution Approach 1:
The reflux diode and its control circuitry are designed to serve multiple protection functions within the battery pack system. The same reflux diode configuration protects against surge voltage from various sources (inductive loads, cable effects, etc.), consolidating multiple protection needs into a single manufacturable assembly rather than requiring separate protection mechanisms for each scenario
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
Effectively protects the discharge control switch from surge voltages by enabling the reflux diode only during the brief period of surge voltage generation, preventing damage and ensuring reliable operation even with high inductive loads.
Implementation Method 1
a first diode connected in series with the switch unit
Implementation Method 2
a reflux control signal is output from the control unit to the insulating portion, and the switch unit is switched from off to on based on the reflux control signal
Data Source
AI summary
A discharge control switch is protected against surge voltage. A battery pack is provided in which a discharge control switch is connected to a positive electrode side power line between a positive electrode terminal and a positive electrode output terminal of a battery or a negative electrode side power line between the negative electrode terminal and a negative electrode output terminal of the battery, a reflux portion is connected between the positive electrode side power line and the negative electrode side power line on a side closer to the positive electrode output terminal and the negative electrode output terminal than the discharge control switch, a reflux control signal is output from a control unit to an insulating portion, and a switch unit is switched from off to on based on the reflux control signal.