Battery Module Bypass Switching for SOC Balancing Without Energy Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power storage systems, imbalanced state of charge (SOC) among battery modules leads to inefficiencies, and conventional solutions like passive discharge through resistors result in energy wastage.
Innovation Solution
A battery module comprising a battery body, main-path and bypass connection controlling circuits, and buffer circuits, which allows for controlled connection and disconnection from the system to balance SOC without energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If passive discharge via resistor is used to balance SOC, then SOC consistency among battery modules is improved, but energy is wasted as heat
Solution Approach 1:
The patent extracts the problematic battery module (with higher SOC) from the main power path using a bypass connection controlling circuit. By taking out this module from the charging/discharging path, its SOC can be allowed to naturally converge with other modules without active discharge, thereby avoiding energy waste while maintaining SOC consistency.
Solution Approach 2:
The patent implements dynamic connection and disconnection of battery modules based on real-time SOC monitoring. The main-path connection controlling circuit dynamically switches modules into or out of the power path according to their SOC status, enabling adaptive SOC balancing without energy dissipation. This dynamic approach replaces the static passive discharge method.
2Stability of the object's composition
If battery module is connected into or disconnected from system, then SOC balancing is achieved, but abrupt power change occurs
Solution Approach 1:
The patent introduces buffer circuits that are pre-configured to cushion abrupt power changes when battery modules are connected into or disconnected from the system. These buffer circuits act as a protective buffer, absorbing power fluctuations and preventing harmful transients before they can damage other components. This beforehand cushioning ensures smooth transitions during SOC balancing operations.
Solution Approach 2:
The buffer circuit serves as an intermediary element between the battery module and the rest of the system. When a module is connected or disconnected, the buffer circuit mediates the power transfer, smoothing out abrupt changes and protecting other system components from harmful transients while still enabling SOC balancing.
Data Source
AI summary
A battery module, and an energy storage system and a control method therefor. When a corresponding preset condition is satisfied, battery modules can be switched in or out of a system by means of the on-off of a main loop on-off control circuit and a bypass on-off control circuit, so that the battery modules currently connected into the system can be adjusted in real time, and thus the battery modules in the system can satisfy the corresponding preset condition one by one, namely achieving the same state (for example, achieving SOC equalization), without causing energy waste. Moreover, a main loop buffer circuit or a bypass buffer circuit is provided in the battery module, so that energy impact generated when the battery module is switched in or cut out of the system can be absorbed.