Battery Pack Controller Pre-Discharge Circuit Design
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Solution Overview
Problem
Existing battery pack controllers lack advanced features such as pre-discharge and pre-charge operations while minimizing external component requirements, which are essential for enhanced safety and longevity without increasing manufacturing costs.
Innovation Solution
The enhanced battery pack controllers incorporate a monitor circuit to detect load and fault conditions, a switch control circuit for selective transistor control, and a status detection circuit to perform ramping operations, enabling pre-discharge and pre-charge functions without additional external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced features such as pre-discharge and pre-charge operations are implemented, then safety and longevity are enhanced, but device complexity increases
Solution Approach 1:
The patent combines multiple control functions (monitoring, fault detection, switch control, status detection) into a single integrated controller circuit. This merging of functions allows pre-discharge and pre-charge operations to be implemented without proportionally increasing device complexity, as the functions share common hardware resources and control logic within the unified controller architecture.
Solution Approach 2:
The controller is designed with multi-functional capabilities that handle both pre-discharge and pre-charge operations using the same core components. The monitor circuit, fault detection circuit, and switch control circuit serve multiple purposes depending on the operational mode, reducing the need for separate dedicated components for each function and thereby limiting the increase in device complexity.
2Duration of action of stationary object
If advanced features such as pre-discharge and pre-charge operations are implemented, then longevity is enhanced, but device complexity increases
Solution Approach 1:
The controller performs preliminary actions by detecting load conditions and fault conditions before main operations commence. The pre-discharge and pre-charge functions are activated in advance based on status detection, allowing the battery pack to be prepared for optimal operation and extending longevity without requiring complex real-time intervention systems.
Solution Approach 2:
The controller incorporates self-monitoring capabilities where the monitor circuit continuously tracks battery status and the fault detection circuit automatically identifies issues. This self-service approach allows the system to autonomously manage pre-discharge and pre-charge operations based on detected conditions, reducing the need for external control systems and limiting complexity increases.
3Ease of manufacture
If manufacturing cost is minimized, then cost-effectiveness is improved, but advanced features such as pre-discharge and pre-charge operations cannot be implemented
Solution Approach 1:
The patent integrates multiple control functions into a single controller chip, reducing the total component count and assembly requirements. This merging allows pre-discharge and pre-charge operations to be manufactured using standard integrated circuit processes without requiring additional discrete components, thereby maintaining cost-effectiveness while enabling advanced features.
Solution Approach 2:
The controller replaces complex external control circuits and mechanical switching mechanisms with integrated electronic control logic. By implementing pre-discharge and pre-charge functions through software-controlled electronic switches within the integrated controller, the patent eliminates the need for additional external components, reducing manufacturing cost while maintaining functional versatility.
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
These controllers effectively implement pre-discharge and pre-charge operations, enhancing safety and longevity by minimizing inrush currents and dendrite formation, while maintaining cost-effectiveness by avoiding external component additions.
Implementation Method 1
The switch control circuit ramps the voltage or current by charging or discharging a capacitance via a resistance
Implementation Method 2
The switch control circuit uses a charge pump to generate a drive voltage for asserting or partially asserting the charge transistor control pin
Data Source
AI summary
Enhanced battery pack controllers and control methods are disclosed. One illustrative battery pack controller includes: a monitor circuit that couples to a battery pack load terminal to detect when a voltage of the battery pack load terminal indicates a load condition; a fault detection circuit that couples to a current path through an array of one or more battery cells to detect when a current indicates a fault condition; a switch control circuit that selectively de-asserts a discharge transistor control pin, asserts the discharge transistor control pin, and ramps a voltage or current of the discharge transistor control pin in an open loop fashion for at least 10 ms; and a status detection circuit that in the absence of a fault condition causes the switch control circuit to perform said ramping responsive to detection of the load condition while the discharge transistor control pin is de-asserted.