Modular Battery Group Switching for Fault-Tolerant Energy Storage
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Solution Overview
Problem
Existing energy storage batteries have low fault tolerance and high maintenance costs due to their non-expandable design, requiring replacement when a component fails, leading to system inefficiencies and increased maintenance expenses.
Innovation Solution
The energy storage battery is composed of multiple battery groups connected in parallel, each with independent charge and discharge circuits, allowing for seamless expansion or removal of batteries without affecting others, and utilizing a CAN bus architecture for control, along with charge/discharge limiting branches and precharge branches to manage current flow and fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single integral battery design is used, then the system structure is simple, but the fault tolerance is low and maintenance cost is high
Solution Approach 1:
The energy storage battery is divided into multiple battery groups (first battery group, second battery group, etc.), each with independent charge and discharge circuits. This segmentation allows individual battery groups to be isolated and repaired without affecting the entire system, thereby improving fault tolerance while maintaining manageable system complexity through modular architecture.
2Ease of manufacture
If a single integral battery design is used, then the system is easy to manufacture, but it is not expandable and requires complete replacement when capacity needs to be increased
Solution Approach 1:
By dividing the battery into independent battery groups with standardized interfaces, the system becomes expandable. New battery groups can be added to increase capacity or voltage platform without replacing the entire system, while each module maintains manufacturing simplicity through standardized design.
Solution Approach 2:
Each battery group is designed with universal charge and discharge circuits that can function independently or in combination with other groups. This universality enables the system to adapt to different capacity requirements and configuration needs while maintaining ease of manufacture through standardized components.
3Device complexity
If a single integral battery design is used, then the system has fewer components, but the operating efficiency drops when a component fails requiring system shutdown
Solution Approach 1:
The system is segmented into independent battery groups that can operate autonomously. When a component fails in one group, only that specific group needs to be shut down for repair while other groups continue operating, thereby maintaining overall system productivity and reducing downtime.
Solution Approach 2:
Each battery group has its own charge and discharge circuits with local control capabilities. This local quality enables independent operation and fault isolation, allowing the system to maintain partial functionality even when local components fail, thus preserving operating efficiency.
4Reliability
If independent charge and discharge circuits are added to each battery group, then fault tolerance improves, but device complexity increases
Solution Approach 1:
The independent charge and discharge circuits are segmented and distributed to each battery group rather than having a centralized control system. This segmentation improves fault tolerance by isolating circuit failures to specific groups while managing complexity through modular, repeatable circuit designs that can be standardized across all groups.
Data Source
Figure 1~2
AI summary
An energy storage battery and a control method thereof. The energy storage battery includes battery groups connected in parallel, and each battery group includes batteries connected in series. Each battery includes a charge and discharge circuit, including a storage battery, a first switch, and a second switch, and the first switch and the second switch are used to control conduction of a connection line between two batteries. The batteries are connected in series to form the battery groups, and the battery groups are connected in parallel to form the energy storage battery, such that when the energy storage battery operates, each battery independently controls the on-off of its first switch and second switch to control the conduction of connection lines between the battery and other batteries, thereby allowing each battery of the energy storage battery to be freely extended. When a certain battery has a fault, it is merely required to control the battery group including the battery and to disconnect and repair the faulty battery, thus improving the overall operation efficiency of the energy storage battery.