Battery Control Circuit Balancing Voltage Differences
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Solution Overview
Problem
Traditional battery management controllers increase space volume and generate signal noise, leading to unstable charging processes and reduced operation lifespan of battery cells due to the need for multiple connections and noise interference.
Innovation Solution
A battery control circuit comprising a voltage detector, controller, and switch that automatically detects voltage differences and balances battery cells by drawing a load current when the difference exceeds a threshold, reducing noise influence and minimizing the number of connections required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery management controller is used to manage battery cells, then the battery can be monitored and controlled, but the space volume increases and multiple pins are required for connections
Solution Approach 1:
The patent divides the battery management function into separate components: a voltage detector for monitoring cell voltages, a controller for processing the data, and a balancing device for equalizing cell charges. This segmentation allows each component to be optimized independently, reducing the overall space volume while maintaining monitoring and control capabilities.
Solution Approach 2:
The controller is designed to perform multiple functions: detecting voltage differences between battery cells, determining which cells need balancing, and controlling the switching of balancing circuits. This multi-functionality reduces the need for separate dedicated components, thereby reducing space volume and pin requirements.
2Reliability
If a battery management controller is used to manage battery cells, then the battery can be monitored and controlled, but the number of pins required for connections increases
Solution Approach 1:
The controller uses a single communication interface to perform multiple functions: reading voltage detector data, sending control signals to the switching device, and managing the balancing process. This multi-functional interface reduces the number of pins required compared to having separate dedicated pins for each function.
Solution Approach 2:
The patent combines the voltage detection, control logic, and balancing management functions into a single integrated controller unit. This merging of functions reduces the number of separate connection pins needed, as the controller handles all battery management tasks through unified interfaces.
3Reliability
If a battery management controller is used to manage battery cells, then the battery can be monitored and controlled, but signal noise is generated causing charging instability
Solution Approach 1:
The patent extracts the voltage detection function into a separate voltage detector component that is electrically isolated from the controller and balancing device. This separation removes the noise-generating switching operations from the sensitive voltage measurement circuit, eliminating signal noise while maintaining monitoring capability.
Solution Approach 2:
By segmenting the battery management system into distinct functional blocks (voltage detector, controller, balancing device), the patent isolates the noise-sensitive voltage detection circuit from the noise-generating switching and control circuits. This segmentation prevents signal noise from affecting the charging process stability.
4Reliability
If a battery management controller is used to manage battery cells, then the battery can be monitored and controlled, but the operation lifespan of cells is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the voltage detector continuously monitors battery cell voltages and provides data to the controller. The controller uses this feedback to automatically activate the balancing device when voltage differences exceed a threshold, and deactivate it when the threshold is met. This closed-loop feedback control prevents overcharging and ensures balanced charging, extending cell operation lifespan.
Solution Approach 2:
The balancing circuit is designed with dynamic switching capability, allowing it to be activated or deactivated based on real-time battery conditions. The switching device dynamically adjusts the balancing operation, connecting or disconnecting the balancing device as needed, which prevents unnecessary current flow and reduces stress on the battery cells, thereby extending their lifespan.
Data Source
AI summary
A battery control circuit for balancing a battery includes a voltage detector, a controller, a balancing device, and a switch. The voltage detector is configured to detect a voltage difference of the battery so as to generate a detecting signal. The controller is configured to generate a control signal according to the detecting signal. The switch is coupled between the battery and the balancing device, and is opened or closed according to the control signal, wherein if the voltage difference is greater than a threshold value, the switch is closed and the balancing device draws a load current from the battery, and if the voltage difference is smaller than or equal to the threshold value, the switch is opened and the balancing device is not capable of drawing any current.