Battery Module Current Isolation for Overcharge Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery energy storage systems lack precise control over current in each battery module, leading to risks of overcharging or overdischarging, which can cause fires and reduce the service life due to the influence of external DC system currents.
Innovation Solution
A battery module with full current control, comprising an energy transmission control unit, an intermediate energy unit, and a current control unit, which regulates the flow of energy to prevent external current fluctuations and allows separate control of each battery module by cutting off charging or discharging when voltage thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple battery modules are connected in series to form a battery cluster, then the voltage capacity of the energy storage system is improved, but the current of each battery module cannot be controlled separately, leading to overcharging or overdischarging risks
Solution Approach 1:
The patent divides the battery cluster into multiple independently controllable battery modules, each equipped with its own controllable switch (e.g., IGBT devices). This segmentation allows individual current control for each module while maintaining series connection for high voltage output, resolving the contradiction between voltage capacity and current control precision.
2Reliability
If controllable switches are added to each battery module to enable separate current control, then the safety and control precision are improved, but the device complexity and cost increase
Solution Approach 1:
The controllable switches in each battery module serve multiple functions: they control current flow during normal operation, provide protection against overcharging and overdischarging, and enable isolation of faulty modules. This multi-functionality justifies the added complexity by delivering comprehensive safety and control capabilities.
3Loss of energy
If the battery module is directly connected to the external DC system, then the energy transmission efficiency is improved, but the external DC system current fluctuations affect the battery module performance and reduce service life
Solution Approach 1:
The patent introduces an intermediate energy storage device (such as a capacitor or small battery) between the external DC system and the battery module. This intermediary buffers current fluctuations from the external system, protecting the battery module while maintaining efficient energy transmission through controlled charge/discharge cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively isolates the impact of external DC system currents on battery modules, preventing overcharging or overdischarging, thereby extending the service life and ensuring safety by allowing independent control of each battery module.
Implementation Method 1
an intermediate energy unit, wherein the high-voltage end of the energy transmission control unit is connected with the high-voltage end of the intermediate energy unit
Implementation Method 2
an energy transmission control unit, wherein the high-voltage end of the energy transmission control unit is connected with the high-voltage ends of the intermediate energy unit and the current control unit respectively
Implementation Method 3
the current control unit is used for closed-loop control of the charge current of the battery module according to the average energy stored by the intermediate energy unit
Data Source
AI summary
The invention discloses a full current control battery module and an energy storage system of full current control battery, belonging to the field of electric energy storage, wherein the full current control battery module comprises an energy transmission control unit, a relay energy unit and a current control unit. The invention can realize the separate current control of each battery module and isolate the influence of the current generated by the external DC system on the battery module.