Battery Protecting Circuit Voltage Balancing
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Solution Overview
Problem
In battery protecting circuits with multiple secondary batteries connected in series, the imbalance of electrical capacities between batteries due to built-in regulators leads to voltage disparities and risks of parasitic element operation, causing inefficiencies and potential damage.
Innovation Solution
A battery protecting circuit design that includes two battery protecting ICs and a constant voltage output unit, where the ICs monitor and control charging and discharging currents through transistors, ensuring balanced voltage and preventing overcharging and overdischarging by using a protecting module with charge and discharge controlling units, and a constant voltage output circuit that maintains a stable voltage across the battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple secondary batteries are connected in series with built-in regulators, then each battery can be independently protected, but voltage imbalance and parasitic element operation occur causing capacity reduction
Solution Approach 1:
The patent extracts the regulator function from individual battery protecting ICs and relocates it to a separate constant voltage output unit. This separation allows the protecting ICs to focus solely on protection functions while the regulator handles voltage balancing, preventing parasitic element operation and capacity loss.
Solution Approach 2:
The patent introduces a constant voltage output unit as an intermediary between the battery series connection and the protecting ICs. This intermediary receives the maximum voltage from the battery series and provides regulated voltage to external loads, preventing direct voltage conflicts that cause parasitic element operation.
2Power
If built-in regulators are included in battery protecting ICs, then voltage regulation is provided, but voltage disparities cause parasitic element operation and inefficiency
Solution Approach 1:
The patent segments the battery protecting system into distinct functional modules: protecting ICs for protection functions and a separate constant voltage output unit for regulation. This segmentation prevents the interaction between regulator and protection circuits that generates parasitic elements.
Solution Approach 2:
The constant voltage output unit acts as an intermediary that receives maximum voltage from the battery series and provides regulated voltage to external loads, preventing direct voltage conflicts between batteries that cause parasitic element operation in protecting ICs.
3Ease of operation
If each battery has its own protecting IC with regulator, then individual battery control is achieved, but electrical capacity imbalance occurs
Solution Approach 1:
The patent implements a universal constant voltage output unit that serves all batteries in the series connection. This single regulator unit manages voltage for the entire battery pack, ensuring uniform voltage distribution and preventing capacity imbalance while maintaining individual battery protection through separate protecting ICs.
Data Source
AI summary
A disclosed battery protecting circuit includes a battery protecting IC powered by a voltage of a secondary battery; another battery protecting IC powered by a voltage of another secondary battery connected to the secondary battery in series; and a constant voltage output unit which receives a maximum voltage obtained by adding voltages of the secondary battery and the other secondary battery in series and outputs a constant voltage upon receipt of a control signal from an output terminal of the battery protecting IC or the other battery protecting IC.