Battery Module Discharge Rate Balancing for Extended Cycle Life
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Solution Overview
Problem
Material handling vehicle batteries have a limited number of charge and discharge cycles, leading to a finite useful life, and existing battery management systems do not effectively optimize battery operation to extend this life.
Innovation Solution
A battery management system that includes sensors, actuators, and a controller to monitor and manage battery state-of-charge and state-of-health parameters, optimizing discharge rates and depth of discharge ranges for individual battery modules to extend battery life, using empirical data and cell-specific parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery operates at high discharge rates to meet load demands, then power delivery is improved, but battery life is reduced
Solution Approach 1:
The battery pack is divided into multiple modules, each with its own sensors and control. The controller selectively activates specific modules based on load requirements and individual module state-of-charge levels, allowing flexible power delivery while managing overall discharge rates to extend battery life.
Solution Approach 2:
The system dynamically adjusts the number of active battery modules and their discharge rates based on real-time load demands and state-of-charge measurements. This dynamic optimization allows the system to deliver required power while preventing excessive discharge rates that would reduce battery life.
2Use of energy by moving object
If the battery is deeply discharged to maximize capacity utilization, then energy output is improved, but battery degradation accelerates
Solution Approach 1:
The system changes the operating parameters of battery modules by adjusting which modules are active and at what discharge rates they operate. By monitoring state-of-charge and dynamically adjusting these parameters, the system optimizes energy output while maintaining discharge rates that prevent excessive degradation.
3Power
If all battery modules are used simultaneously to meet high load demands, then power delivery is improved, but individual module wear is increased
Solution Approach 1:
The battery pack is segmented into multiple independent modules with individual state-of-charge monitoring. The controller selectively activates specific modules based on current load requirements and individual module states, allowing flexible power delivery while distributing wear more evenly across the battery pack over time.
Data Source
AI summary
A battery management system is provided. The battery management system includes a controller comprising at least one processor and at least one memory. The at least one memory comprising instructions executed by the at least one processor to receive load information about a load from a load sensor, receive battery operating information from a battery sensor, determine a number of battery modules needed to supply the load and operate each battery module at or below a preferred discharge rate based on the load information and the battery operating information, select a group of battery modules included in the battery based on the number of battery modules and the battery operating information, each battery module included in the group of batteries having a current depth of discharge within the preferred depth of discharge range, and instruct the battery to supply the load using the group of battery modules.