Parallel Battery Voltage Detection Circuit for Reverse Current Safety
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Solution Overview
Problem
Existing battery apparatuses with parallel-connected secondary batteries face safety issues due to internal short-circuits, which can cause high reverse currents, and current detection circuits in series with each battery increase losses and reduce output voltage.
Innovation Solution
A charging/discharging control circuit with a voltage detection portion that compares voltages between secondary batteries and controls charging/discharging switches to prevent current flow to internally short-circuited batteries, eliminating the need for resistors in current detection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current detection circuit with a resistor is provided in series with each secondary battery, then backward currents can be detected and safety can be improved, but power loss increases and output voltage decreases
Solution Approach 1:
The patent replaces the traditional current detection method using resistors (electrical measurement) with a voltage detection method that monitors voltage differences between parallel-connected batteries. This substitution eliminates the need for current-detecting resistors, thereby removing the associated power losses while maintaining the ability to detect abnormal current flow patterns that indicate internal short circuits.
Solution Approach 2:
The patent introduces a voltage detection circuit as an intermediary mechanism to indirectly detect current abnormalities. Instead of directly measuring current through resistors, the system uses voltage differences between batteries as a mediator to infer the presence of backward currents, thus avoiding direct current measurement and its associated energy losses.
2Reliability
If a current detection circuit with a resistor is provided in series with each secondary battery, then backward currents can be detected and safety can be improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage detection function into the existing control circuit architecture, eliminating the need for separate current detection circuits with resistors for each battery. By combining multiple battery monitoring functions into a unified voltage detection system, the overall device complexity is reduced while maintaining comprehensive safety monitoring capabilities.
Solution Approach 2:
The voltage detection circuit serves multiple functions: it monitors battery voltage levels, detects voltage differences between parallel-connected batteries, and indirectly identifies backward current flow. This multi-functional approach replaces the single-purpose current detection resistors, reducing the number of components and simplifying the overall system.
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 solution enhances safety by preventing output voltage drops and reducing losses associated with current detection, while maintaining high safety standards for battery apparatuses.
Implementation Method 1
a voltage detection portion which detects a difference in voltage between secondary batteries connected in parallel or detects that backward currents are made to flow
Data Source
AI summary
To provide a charging/discharging control circuit and a battery apparatus which control charging/discharging of secondary batteries connected in parallel and are high in safety while being low in cost. A charging/discharging control circuit and a battery apparatus are each configured to be provided with a voltage detection portion which detects a difference in voltage between secondary batteries connected in parallel or detects that backward currents are made to flow through charging/discharging control switches which are respectively connected to the parallel-connected secondary batteries and control charging/discharging thereof.