Battery Control Circuit Level Shift Voltage Identification
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Solution Overview
Problem
Existing battery control circuits struggle to accurately identify and protect secondary batteries with multiple cells connected in series, as they find it difficult to determine which cell has the maximum or minimum voltage, leading to inadequate overcharge or over-discharge protection.
Innovation Solution
A battery control circuit that includes a level shift circuit, differential amplifier circuits, and specifying circuits to compare cell voltages with threshold voltages, allowing for the identification of the maximum and minimum voltage cells, enabling effective overcharge and over-discharge detection and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage monitoring is used for multiple battery cells, then the circuit structure is simple, but it is difficult to identify which cell has the maximum or minimum voltage, leading to inadequate protection
Solution Approach 1:
The patent divides the voltage monitoring function into separate modules for each battery cell, with each cell having its own voltage detection circuit. This segmentation allows individual cell voltages to be monitored and identified independently, solving the problem of identifying maximum and minimum voltage cells while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The patent introduces intermediary circuits including level shift circuits and differential amplifier circuits that facilitate voltage comparison between cells. These intermediary components enable accurate voltage identification by translating and comparing cell voltages against reference levels, achieving precise measurement without requiring direct complex inter-cell wiring.
2Measurement precision
If level shift circuits and differential amplifier circuits are added to identify maximum and minimum voltage cells, then cell voltage identification accuracy is improved, but the circuit complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuits: the level shift circuits and differential amplifier circuits are merged to perform both voltage level translation and comparison operations. This merging reduces the overall number of separate components needed while achieving accurate maximum and minimum voltage cell identification, thereby managing circuit complexity through functional integration.
Solution Approach 2:
The differential amplifier circuits serve multiple functions: they compare cell voltages with reference voltages, identify maximum and minimum voltage cells, and provide signals for overcharge and over-discharge detection. This multi-functionality reduces the need for separate dedicated circuits for each function, achieving high measurement precision while controlling overall circuit complexity.
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
The solution accurately identifies the highest and lowest voltage cells, enabling precise protection against overcharging and over-discharging, thereby ensuring the safe operation and longevity of secondary batteries.
Implementation Method 1
a maximum voltage output circuit including differential amplifier circuits for the plurality of respective level shift voltages, the respective differential amplifier circuits being configured to compare the plurality of corresponding level shift voltages with a plurality of threshold voltages
Data Source
AI summary
A battery control circuit that is used for a battery protecting apparatus configured to protect a secondary battery in which cells are connected in series includes: a level shift circuit configured to shift respective levels of cell voltages of the cells to generate level shift voltages; a maximum voltage output circuit including differential amplifier circuits for the respective level shift voltages, the respective differential amplifier circuits being configured to compare the corresponding level shift voltages with threshold voltages to generate output voltages, the maximum voltage output circuit being configured to simultaneously compare the output voltages to output a maximum voltage corresponding to a cell voltage whose voltage value is highest; an overcharge detecting circuit configured to detect overcharging of the secondary battery based on the maximum voltage; and a maximum voltage cell specifying circuit configured to specify, based on the output voltages, a cell whose voltage value is highest.