Battery Pack Protection Method Using Dynamic Deactivation Times
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Solution Overview
Problem
Battery protection systems in motor-driven applications, such as e-bikes, face delays in protection deactivation, leading to additional waiting time for motor operation due to inefficient management of battery voltage and charging cycles.
Innovation Solution
A battery management system (BMS) that controls protection operations based on terminal voltage, counts protection operation executions, and adjusts deactivation times using reference counts and times to optimize battery protection and reduce waiting times for motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery protection system executes protection operations to uncouple the battery pack from the capacitor when terminal voltage exceeds thresholds, then battery safety is improved, but additional waiting time is introduced for motor operation
Solution Approach 1:
The patent applies dynamics by making the deactivation time variable rather than fixed. The BMS adjusts the deactivation time based on the number of protection operation executions: a first deactivation time is applied when the execution count is below a reference value, and a second deactivation time is applied when the count reaches or exceeds the reference value. This dynamic adjustment resolves the contradiction by optimizing the balance between battery safety and motor operation readiness time based on operational history
Solution Approach 2:
The patent changes the parameter of deactivation time based on the execution count of protection operations. By monitoring how many times protection operations have been executed and comparing this count to a reference value, the system switches between different deactivation time parameters. This parameter change strategy allows the system to maintain battery safety while reducing unnecessary waiting time when the battery has demonstrated stable operation through multiple protection cycles
2Reliability
If the BMS repeatedly executes protection operations to uncouple the battery pack when voltage thresholds are exceeded, then battery protection is improved, but motor-driven device performance deteriorates due to delayed startup
Solution Approach 1:
The system dynamically adjusts the deactivation time parameter based on the execution count of protection operations. When the execution count is low, a longer first deactivation time ensures thorough battery protection. When the execution count reaches the reference value, indicating stable operation patterns, the system switches to a shorter second deactivation time, thereby improving motor-driven device performance while maintaining adequate battery protection
Solution Approach 2:
The BMS implements feedback by monitoring the execution count of protection operations and using this information to adjust future deactivation times. The system continuously evaluates whether the number of protection operations has reached the reference value and accordingly modifies the deactivation time parameter, creating a closed-loop control that balances battery protection with device performance
Data Source
AI summary
A method for protecting batteries with consideration for the influence of a load coupled to a battery pack is provided. The battery pack includes a terminal to be coupled to a capacitor of the load, and a battery management system for controlling a protection operation according to a voltage of the terminal, counting a number of protection operation executions after the load is coupled to the battery pack, and differently controlling a deactivation time of the protection operations depending on whether or not the number of executions is greater than or equal to a reference count.