Battery Cell Control via Probability Weighting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery systems for electric vehicles require high communication bandwidth for open-loop and closed-loop control of secondary batteries, leading to increased complexity and costs, as well as inefficient active balancing of battery cells.
Innovation Solution
An open-loop and/or closed-loop control system that uses a central electronic unit to generate a control signal with reduced data transmission, allowing cell electronic units to adjust battery cell activation probabilities based on state parameters and orientation, enabling efficient voltage control and balancing with lower bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional control systems transmit absolute probability values from central electronic unit to cell electronic units in each control step, then voltage control can be achieved, but communication bandwidth requirement increases significantly (320 kbits/s or higher)
Solution Approach 1:
The patent extracts only the essential control information (increment direction: up/down/hold) from the complete probability value information, transmitting only the necessary minimal data subset through the communications connection while cell electronic units locally compute full probability values based on this compact control signal combined with stored state parameters
Solution Approach 2:
The control system segments the probability control into two parts: (1) central electronic unit determines and transmits only the increment direction (up/down/hold), and (2) cell electronic units locally compute complete probability values by combining the compact control signal with stored state parameters, distributing the computational workload and reducing communication burden
2Measurement precision
If high communication bandwidth is provided for transmitting control data, then control accuracy can be maintained, but system complexity and production costs increase
Solution Approach 1:
The patent extracts only the essential control information (increment direction: up/down/hold) from the complete probability value information, transmitting only the necessary minimal data subset through the communications connection while cell electronic units locally compute full probability values based on this compact control signal combined with stored state parameters
Solution Approach 2:
Cell electronic units perform self-service by locally storing state parameters and autonomously computing complete probability values from compact control signals received from the central electronic unit, reducing dependency on high-bandwidth communication infrastructure
3Productivity
If absolute probability values are transmitted in each control step, then up-to-date control is achieved, but communication update rate must be very high (20000 control steps per second)
Solution Approach 1:
The patent extracts only the essential control information (increment direction: up/down/hold) from the complete probability value information, transmitting only the necessary minimal data subset through the communications connection while cell electronic units locally compute full probability values based on this compact control signal combined with stored state parameters
Solution Approach 2:
The system uses periodic control cycles where cell electronic units update their probability values at high frequency (20000 times per second) by combining compact periodically-transmitted control signals with locally-stored state parameters, maintaining high update rates without proportionally increasing communication bandwidth
Data Source
AI summary
The invention relates to an open-loop and/or closed loop control system (1) for a secondary battery (3). Each cell electronics unit (4) is configured to detect a respective state of the battery cell (2), to generate a state parameter assigned to the respectively detected state, to weight, with the respective state parameter, a value of a probability of the battery cell (2) being switched on and to control the state of the battery cell (2) as a function of the respective control signal and the value, weighted with the respective state parameter, of the probability of the battery cell (2) being switched on. A control signal contains at least one information item according to which the values, stored in the cell electronics units (4), of the probability of the respective battery cell (2) being switched on are retained, incrementally increased, incrementally reduced or reset to a predefined output value.