Assembled Battery Voltage Detection Circuit Abnormality
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Solution Overview
Problem
Existing assembled-battery voltage detection devices fail to accurately distinguish between disconnections and short circuits in voltage detection lines, leading to potential false determinations and inadequate response in battery management systems.
Innovation Solution
The proposed solution involves a device with single-battery voltage detection circuits, connectors, and an assembled-battery voltage detection circuit that calculates voltage sums and potential differences, using N-type MOS transistors and constant-voltage diodes to detect voltages at both ends of the battery, and an abnormality output unit to differentiate between disconnections and short circuits based on voltage sum agreements or disagreements with potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection is performed using conventional methods in assembled batteries, then voltage monitoring is achieved, but false determination between disconnection and short circuit cannot be avoided
Solution Approach 1:
The voltage detection function is segmented into multiple independent detection paths: individual cell voltage detection circuits for each battery cell, and assembled battery voltage detection circuit for the entire battery pack. This segmentation allows independent verification of voltage measurements and enables distinction between disconnection and short circuit abnormalities by comparing results from different detection paths.
Solution Approach 2:
The system implements feedback by comparing the sum of individual cell voltages with the directly measured assembled battery voltage. When these values disagree beyond a threshold, the system generates an abnormality determination. This feedback mechanism enables continuous verification and accurate identification of abnormal conditions through iterative comparison and validation.
2Device complexity
If simple voltage detection circuits are used, then device complexity is reduced, but inability to distinguish disconnection from short circuit occurs
Solution Approach 1:
The voltage detection circuits serve multiple functions: they detect individual cell voltages for monitoring purposes, provide data for calculating total voltage, enable comparison with assembled battery voltage measurement, and facilitate abnormality determination. This multi-functionality allows a single detection system to achieve both simplicity and high precision abnormality detection capabilities.
Solution Approach 2:
The system merges individual cell voltage detection circuits with the assembled battery voltage detection circuit into an integrated detection system. By combining these detection functions and comparing their results, the system achieves accurate distinction between disconnection and short circuit conditions without requiring completely separate detection systems, thus balancing complexity and precision.
Data Source
AI summary
An assembled-battery voltage detection device for detecting a voltage at an assembled-battery including a plurality of single batteries connected in series includes: single-battery voltage detection circuits detecting voltages at the respective single batteries; single-battery voltage detection terminals connected to ends of the single batteries; connectors connecting the single-battery voltage detection terminals and the single batteries; voltage detection terminals detecting a voltage at one of the single batteries located at one end in the assembled battery; an assembled-battery voltage detection circuit detecting a potential difference between the voltage detection terminals; a single-battery voltage sum calculator calculating a sum of the voltages detected by the single-battery voltage detection circuits; an end-battery voltage abnormality determination unit determining whether the voltage at the single battery located at the end is 0 V; and an abnormality output unit outputting an abnormality depending on predetermined conditions.