Hot Swap Battery Module Voltage Mismatch Control
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Solution Overview
Problem
Connecting battery modules in parallel with different voltages and capacities can lead to excessive current flow, damaging the modules and potentially causing fires or explosions, as existing technologies do not allow for immediate parallel connection without considering voltage and capacity differences.
Innovation Solution
A hot-swap battery module comprising a voltage terminal, battery, discharge switch, charge switch, first power transistor, smart chip, and ideal diode controller, which enables immediate parallel connection by controlling the power transistor based on voltage differences, preventing excessive discharge or charge currents through multi-stage charge and discharge management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery modules with different voltages and capacities are connected in parallel to increase battery capacity, then the battery capacity is improved, but excessive current flows into modules with smaller voltages/capacities causing damage, fire or explosion
Solution Approach 1:
An ideal diode controller is introduced as an intermediary component between battery modules to control current flow direction. The ideal diode allows current to flow only in the forward direction (from higher voltage to lower voltage) and blocks reverse current, preventing excessive current from damaging modules with smaller voltages or capacities while enabling safe parallel connection for increased battery capacity
Solution Approach 2:
The system continuously monitors voltage differences between parallel-connected battery modules and dynamically adjusts the ideal diode controller's operation. When voltage reversal is detected (when a module's voltage becomes lower than another), the controller immediately blocks current flow in reverse direction, providing real-time feedback control to prevent overcharging and ensure operational safety
2Loss of time
If battery modules are immediately connected in parallel without voltage matching, then connection time is reduced, but voltage differences cause harmful current flow
Solution Approach 1:
The ideal diode controller is pre-configured in the circuit before parallel connection occurs, establishing a protective mechanism in advance. This preliminary setup allows immediate connection of battery modules with different voltages without requiring pre-matching, as the diode controller is already positioned to manage any voltage differences that arise
Solution Approach 2:
The ideal diode controller acts as a protective intermediary that enables immediate parallel connection by unidirectionally controlling current flow. It allows fast connection without voltage matching while preventing harmful reverse current, thus eliminating the need for time-consuming voltage equalization procedures
3Reliability
If the ideal diode controller turns off the first power transistor to prevent reverse charging, then battery protection is improved, but current control capability is reduced
Solution Approach 1:
The smart chip serves as an intelligent intermediary between the ideal diode controller and the power transistor. It receives voltage difference signals from the diode controller and processes them to generate appropriate control commands for the power transistor, enabling both protective shutdown when needed and precise current control during normal operation
Solution Approach 2:
The system dynamically changes the control parameters of the power transistor based on real-time voltage conditions. When voltage difference exceeds safety thresholds, the smart chip adjusts the transistor's conduction state to block reverse current; when conditions are safe, it optimizes the transistor's operation for maximum current control capability and efficiency
Data Source
AI summary
A hot swap battery module uses a smart chip and an ideal diode controller to control a power transistor so as to implement a multi-step charge or discharge. Consequently, battery modules which have different voltages or battery capacities can be immediately connected in parallel. When the hot swap battery module is hot swapped, the hot swap battery module also can avoid an excessive charge current or discharge current to damage itself.