Series Battery Module Balancing by Consumed Charge Feedback
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Solution Overview
Problem
Existing technologies fail to effectively balance capacity differences among battery modules connected in series, leading to potential overcharge or overdischarge issues due to varying current consumption, which can degrade performance and efficiency.
Innovation Solution
A semiconductor device with a first and second battery module, each comprising a controlling portion and a measuring circuit, measures the difference in consumed electrical amount between modules and initiates discharge from the second module based on this difference to balance capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery modules are connected in series to increase system capacity, then the total energy storage increases, but capacity unbalance occurs due to differences in consumed electric current among modules
Solution Approach 1:
The patent implements a feedback mechanism where a measuring circuit continuously monitors the consumed electric current in each battery module and feeds this information back to the control unit. The control unit compares the consumed current values and automatically activates discharge control for modules with lower consumption, thereby dynamically maintaining capacity balance across all modules connected in series.
Solution Approach 2:
The system enables self-service by allowing each battery module to autonomously manage its own discharge process. When the control unit detects that a specific module has consumed less electric current than others, it automatically activates the discharge control for that module without requiring external intervention, thus maintaining balance through self-regulation.
2Device complexity
If battery modules operate without capacity balancing, then the system structure remains simple, but overcharge or overdischarge occurs on some cells leading to protection function activation and insufficient performance
Solution Approach 1:
The battery management system operates autonomously by automatically detecting capacity unbalance through the measuring circuit and initiating discharge control for specific modules without requiring external intervention. This self-service mechanism prevents overcharge and overdischarge conditions while maintaining relatively simple system architecture.
3Stability of the object's composition
If discharge control is activated to balance capacity among modules, then capacity balance is improved, but additional control circuits and measuring devices are required
Solution Approach 1:
The control unit performs multiple functions: it monitors the consumed electric current in each battery module, compares the measured values, determines which modules require discharge control, and activates the discharge control switches. This multi-functional approach achieves capacity balancing without requiring separate dedicated control circuits for each function, thereby limiting the increase in device complexity.
Data Source
AI summary
A semiconductor device is provided, the semiconductor device comprises a first battery module and a second battery module connected in series, the first battery module comprising a first controlling portion controlling a first cell group where a plurality of battery cells are connected in series; and a controller communicating with a device driven when receiving a power supply from the first and second battery modules, the second battery module comprising a second controlling portion controlling a second cell group where a plurality of battery cells are connected in series; and a first measuring circuit measuring a difference in a consumed electrical amount between the first battery module and the second battery module, and discharge starts from the plurality of battery cells included in the second cell group, based on the difference in the consumed electrical amount measured by the first measuring circuit.