Multi-Series Battery Control System Using Shared Insulation
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Solution Overview
Problem
Conventional multi-series battery control systems for lithium batteries face challenges in achieving high reliability due to increased costs associated with insulation means and noise disturbances, which affect voltage sensing precision.
Innovation Solution
A multi-series battery control system comprising multiple series-connected battery cells, control ICs, cell monitor ICs, and a main controller that uses insulation means for signal communication and abnormality detection, enabling precise voltage sensing and abnormality signaling to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If insulation means are installed for each lower control unit to achieve higher precision voltage sensing, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the signal transmission paths of multiple lower control units by connecting their signal input/output terminals in series to form a common signal line. This allows multiple units to share a single insulation means (isolator) instead of each unit requiring its own insulation, thereby reducing device complexity and cost while maintaining voltage sensing precision through the shared isolated communication channel.
2Reliability
If insulation means are installed for each lower control unit to reduce noise disturbance, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the noise isolation function for multiple lower control units into a single insulation means placed at one end of the series-connected signal line. This shared isolator provides noise resistance and reliability protection for the entire chain of control units without requiring individual insulation for each unit, thus reducing device complexity while maintaining noise resistance.
3Reliability
If multiple insulation means are used to achieve high reliability in signal transmission, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the insulation function into a single shared component that serves multiple lower control units through the series-connected signal line architecture. This reduces the total number of insulation means required, lowering manufacturing cost while maintaining signal transmission reliability through the isolated communication channel that protects against noise and interference.
Data Source
AI summary
A multi-series battery control system comprises a plurality of unit battery cell of which unit consists of multiple battery cells connected in series; a plurality of control IC comprising a control circuit for controlling the unit battery cell; a main controller that sends and receives signal to/from the control ICs via an insulation; means for sending an abnormality signal, which represents the existence or the absence of abnormality of the control ICs or the battery cells, to the main controller from the control ICs, responding to the first signal outputted from the main controller via the insulation; and means for searching contents of the abnormality in the control ICs or the battery cells and sending the abnormality contents signal based on the search, to the main controller from the control ICs, responding to the second signal outputted from the main controller via the insulation.