Intrinsically-Safe Battery Cell Switch-On Delay via Noise Source
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Solution Overview
Problem
High-performance rechargeable battery modules, particularly lithium-ion batteries, face challenges in reliability and safety due to sensitivity to overcharging and deep discharging, requiring complex electronics and significant technical effort for switching methods that overload communication buses, affecting accuracy and efficiency.
Innovation Solution
Intrinsically-safe battery cell units with a switch-on delay implemented using an integrated circuit with a noise source, such as an induction coil, replacing microprocessor units to reduce complexity and data load on communication buses, allowing precise control of nominal voltage and flexible activation/deactivation frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microprocessor units are used to determine switching probability of battery cells, then the reliability and performance of battery cells can be improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces expensive microprocessor units with a simple, inexpensive integrated circuit that generates random switch-on delays using a noise source. This simple circuit is functionally sufficient for the application, eliminating the need for complex processing units while maintaining the required reliability through statistical distribution of switch-on times.
Solution Approach 2:
Each battery cell unit autonomously generates its own random switch-on delay using an integrated noise source and circuit, without requiring external control or communication. The cell unit independently determines its activation time based on internal random noise, eliminating the need for complex centralized control systems.
2Duration of action of moving object
If microprocessor units are equipped in each battery cell to implement switching methods, then the performance and service life of battery cells can be maximized, but the cost and technical effort increase significantly
Solution Approach 1:
The patent replaces expensive microprocessor units with a simple, inexpensive integrated circuit that generates random switch-on delays using a noise source. This simple circuit is functionally sufficient for the application, eliminating the need for complex processing units while maintaining the required reliability through statistical distribution of switch-on times.
3Measurement precision
If complex switching methods are used to control battery cells, then the accuracy of nominal voltage setting can be improved, but the communication bus becomes overloaded causing delays
Solution Approach 1:
The patent extracts the switching control logic from the centralized battery management system and implements it locally in each battery cell unit using simple integrated circuits. This distributes the control function, eliminating communication bus overhead and delays while maintaining accurate voltage control through local autonomous decision-making based on random delay generation.
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 reduces costs and complexity, enhances the accuracy of nominal voltage setting, and extends the service life of battery cells by minimizing the load on the communication bus and enabling flexible, customer-specific battery systems with improved switching efficiency.
Implementation Method 1
The battery cell unit has an integrated circuit which has a noise source. By means of the noise source, a switch-on delay can be generated.
Implementation Method 2
Provision is made in an advantageous embodiment of the invention for the noise source to be an induction coil and in particular a small signal induction coil.
Data Source
AI summary
The invention relates to a battery cell unit (10) which comprises a rechargeable electrochemical battery cell (11), a monitoring-and-control unit (12) connected in parallel to said battery cell (11), and a coupling unit in the form of a half bridge (14) comprising a first power semi-conductor (15) and a second power semi-conductor (16). Said battery cell unit (10) is equipped with an integrated circuit (20) that has a noise source (21). A switch-on delay can be achieved by means of said noise source (21). The invention also relates to a switching method for a battery system which comprises a plurality of intrinsically-safe battery cell units (10).