Battery Module Temperature-Gated Cell Balancing at Low Temperatures
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Solution Overview
Problem
Batteries in handheld electronic devices can enter a permanent fail state when the self-balancing function is activated at low temperatures, causing a voltage imbalance that leads to continuous self-discharge and eventual battery failure.
Innovation Solution
A battery module with a control circuit that detects internal temperature and only activates the self-balancing function when the temperature is above a certain threshold, preventing activation at low temperatures and thus avoiding permanent failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the self-balancing function is activated to balance voltage between battery cells, then voltage balance is improved, but at low temperatures this causes excessive voltage gap and leads to permanent fail state
Solution Approach 1:
The control circuit monitors temperature as a parameter and changes the operational state of the self-balancing function based on temperature thresholds. When temperature drops below the threshold, the self-balancing function is disabled to prevent permanent fail state, while above the threshold it is enabled to maintain voltage balance.
2Stability of the object's composition
If the self-balancing function is always on to maintain voltage balance, then voltage balance is improved, but battery protection at low temperatures deteriorates
Solution Approach 1:
Temperature acts as an intermediary parameter that mediates between the need for voltage balance and the risk of low-temperature damage. The control circuit uses temperature as a decision-making criterion to determine whether to activate the self-balancing function, thus indirectly protecting the battery from low-temperature harm while maintaining voltage balance when safe.
3Reliability
If temperature monitoring and conditional activation is implemented, then battery protection is improved, but device complexity increases
Solution Approach 1:
The control circuit performs preliminary temperature checking before activating the self-balancing function. This preliminary action prevents the system from entering a permanent fail state by anticipating low-temperature conditions and disabling the function in advance, rather than reacting after damage occurs.
Data Source
AI summary
A battery module and a battery protection method thereof are provided. The battery module includes a battery cell pack and a control circuit. The battery cell pack includes a plurality of battery cells connected in series. The control circuit detects an internal temperature of the battery module and determines whether the internal temperature of the battery module is greater than a temperature threshold value. When the internal temperature is greater than the temperature threshold value, the control circuit turns on a self-balancing function.