Battery Module Current Balancing via Compensation Units
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Solution Overview
Problem
Conventional battery management systems experience current imbalances between cells and control circuits, leading to undesired current flow and reduced battery life due to differing current consumption rates among control circuits.
Innovation Solution
A current balancing system is implemented using compensation units within each control circuit, which generate compensation currents to equalize the total current consumption across all circuits, ensuring no current flows between cells and control circuits, thereby maintaining a balanced working state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control circuits are used to manage battery cells, then cell monitoring and protection capability is improved, but current imbalance between control circuits occurs leading to undesired current flow
Solution Approach 1:
A current balancing circuit is introduced as an intermediary component between the control circuits and battery cells. This balancing circuit includes compensation transistors that act as mediators to equalize the current distribution, preventing harmful current imbalances while maintaining the benefits of multiple control circuits for cell monitoring
Solution Approach 2:
The invention dynamically adjusts the operating parameters of the control circuits by introducing compensation currents through the balancing circuit. By changing the current parameters compensatorily, the system maintains equal current flow through each battery cell despite differences in individual control circuit current consumption
2Adaptability or versatility
If control circuits consume different amounts of current, then individual circuit operation flexibility is improved, but current imbalance causes cell imbalance and reduced battery life
Solution Approach 1:
The current balancing circuit implements a feedback mechanism where the current consumption of each control circuit is monitored and compensated in real-time. The balancing circuit detects current imbalances and adjusts compensation currents accordingly, ensuring that battery cells receive equal current throughout operation, thereby extending battery life while preserving circuit flexibility
Solution Approach 2:
The compensation transistors in the balancing circuit function as counterweights that offset the unequal current consumption of individual control circuits. By introducing compensating currents that counterbalance the disparities, the system achieves equal current distribution to all battery cells, preventing premature battery failure
Data Source
AI summary
A battery module includes: a battery pack including multiple cells; control circuits corresponding to the cells, each control circuit including a control unit for managing the corresponding cell and a compensation unit for generating a corresponding compensation current such that the sum of the corresponding consumed current and the corresponding compensation current is equal to a target total current, where the control circuits include a first control circuit and a second control circuit, where the first control circuit includes a first control unit operating with a first consumed current, the second control circuit includes a second control unit operating with a second consumed current, and where the first control circuit conditionally generates a first compensation current and the second control circuit conditionally generates a second compensation current based on a comparison of the first consumed current and the second consumed current.