Parallel Battery Module SOH Detection During Continuous Power Supply
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Solution Overview
Problem
Current methods for detecting the state of health of lithium-ion batteries in parallel configurations are inaccurate, leading to the replacement of functional batteries and potential power supply failures, as they rely on calculating health based on power supply current and time without considering individual battery capacities and states of charge effectively.
Innovation Solution
A battery system with a processing module that alternately controls battery modules to perform discharging or charging operations, using preset currents and recording target times to determine the state of health of each module, ensuring that other modules can provide sufficient power during detection, thereby improving accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the state of health of parallel lithium-ion batteries is calculated based on power supply current and time, then the detection method is simple, but the detection accuracy is low leading to replacement of functional batteries
Solution Approach 1:
The patent divides the battery system into multiple battery modules (first battery module, second battery module, etc.) and performs separate state of health detection on each module. By segmenting the detection process, the system can identify which specific module needs replacement, preventing unnecessary replacement of functional batteries while maintaining detection accuracy.
Solution Approach 2:
The patent performs preliminary actions by having battery modules alternately perform discharge or charge operations before final state of health calculation. The processing module controls battery modules to perform preliminary discharge/charge operations, records target times, and then calculates state of health based on these operations, ensuring accurate detection before making replacement decisions.
2Measurement precision
If all battery modules are used for power supply simultaneously, then the power supply capability is sufficient, but the state of health of individual modules cannot be detected
Solution Approach 1:
The patent implements periodic action by having battery modules alternately perform discharge or charge operations in a cyclic manner. The processing module controls battery modules to periodically switch between discharge and charge operations, allowing each module to be individually tested while maintaining overall system functionality during the detection process.
Solution Approach 2:
The patent changes operational parameters by switching battery modules between different states (discharge operation, charge operation, or power supply mode). The processing module controls the operational state of each battery module, changing parameters such as current direction and operational mode to enable individual state of health detection while ensuring other modules can provide sufficient power.
3Measurement precision
If a battery module is taken out for state of health detection, then the detection accuracy improves, but the power supply capability of the system decreases
Solution Approach 1:
The patent merges the functions of multiple battery modules to compensate for the module being tested. When one battery module performs discharge or charge operations for detection, other battery modules are controlled to provide power supply, merging their capabilities to ensure the overall system maintains sufficient power supply capability and reliability.
Solution Approach 2:
The processing module acts as an intermediary that coordinates the operations between battery modules. It controls which module performs detection operations and which modules provide power supply, managing the transition and ensuring continuous reliable power supply to the power-supplied object throughout the detection process.
Data Source
AI summary
A battery system is provided, including a processing module and a plurality of battery modules. Each of the plurality of battery modules includes a battery management system and an electrochemical cell pack controlled by the battery management system. The processing module is configured to control the electrochemical cell pack to alternately perform a discharging or charging operation. A sum of power of battery modules other than a first battery module in the plurality of battery modules is greater than power required by a target power-supplied object, and the first battery module is any one of the plurality of battery modules. A battery management system is configured to record a target time. The processing module or the battery management system is configured to determine a state of health of the electrochemical cell pack in the first battery module based on the target time.