Battery Cell Balancing Current Measurement Circuit
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Solution Overview
Problem
Existing power storage systems face challenges in accurately determining the charging/discharging amounts of secondary batteries connected in series, leading to inefficiencies and increased costs due to the complexity of circuit wires and component numbers in conventional cell-balancing circuits.
Innovation Solution
A power storage apparatus with a control method that uses a single current measurement circuit to measure the entire module current and balance current, allowing for accurate determination of each battery cell's charging/discharging amounts through active and passive cell-balancing controls, reducing the number of required current measurement circuits and minimizing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current measurement circuit is provided for each battery cell to accurately measure charging/discharging amounts, then measurement precision is improved, but device complexity and manufacturing cost increase due to increased number of components and circuit wires
Solution Approach 1:
The patent merges the current measurement functions by providing a single current measurement circuit that measures the total current for the entire battery string, rather than having separate measurement circuits for each battery cell. This reduces the number of components and circuit wires while still enabling accurate determination of individual cell charging/discharging amounts through control unit calculations.
Solution Approach 2:
The single current measurement circuit serves multiple functions by measuring the total current that is then used to calculate charging/discharging amounts for multiple individual battery cells through the control unit, making the measurement system universal for the entire battery string rather than dedicated to individual cells.
2Reliability
If a cell-balancing circuit is implemented to equalize battery cell voltages, then reliability is improved by preventing battery variations, but device complexity increases due to additional components and circuitry
Solution Approach 1:
The patent combines the cell-balancing function with the existing current measurement and control system. The control unit uses the single current measurement circuit to detect charging/discharging amounts and control the switching elements to perform cell balancing, merging multiple functions into a unified system rather than requiring separate dedicated balancing circuitry.
Solution Approach 2:
The system performs cell balancing autonomously by having the control unit automatically detect variations in battery cell voltages and control the switching elements to equalize charges, enabling the battery system to self-regulate without external intervention or complex external balancing equipment.
Data Source
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AI summary
[Object] To enable charging/discharging amounts of secondary batteries connected in series to be accurately obtained without increasing the costs. [Solving Means] A power storage apparatus includes a battery section in which a plurality of power storage element sections each including at least one power storage element are connected in series, a cell-balancing circuit that are connected in parallel to a plurality of power storage element sections and performs a cell-balancing operation between plurality of power storage element sections, a control unit that controls the cell-balancing current flowing through the cell-balancing circuit, and an entire-current measurement section that measures a current value of an entire current flowing through the entire battery section and a cell-balancing current measurement section that measures a current value of the cell-balancing current.