Method for operating a battery energy storage system
The BESS method automates residual energy discharge in lithium-ion batteries using inverter infrastructure and internal short circuits, addressing safety and cost issues in EoL recycling.
Patent Information
- Application Number
- DE102024200656
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-07-31
AI Technical Summary
Existing methods for recycling lithium-ion batteries at end of life (EoL) are costly, require manual intervention, and pose safety risks due to residual energy discharge, which is often ignored and can lead to plant damage or human risk.
A method and system for battery energy storage systems (BESS) that automatically discharge residual energy using the existing inverter infrastructure, monitoring temperature with existing sensors, and implementing an internal short circuit at 0V to safely utilize and eliminate residual energy before recycling.
Reduces costs, simplifies the process, enhances safety, and ensures efficient utilization of residual energy, eliminating the need for manual intervention and additional monitoring equipment.
Smart Images
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Abstract
Claims
[1] Method for operating a battery energy storage system, wherein the battery energy storage system is formed from several battery modules, wherein in a first operating phase, the battery energy storage system is used to deliver energy and to be recharged after an energy release, wherein the first operating phase is terminated as soon as an EoL criterion is reached, wherein the battery energy storage system has a residual energy after the first operating phase, wherein in a second operating phase the residual energy present in the battery energy storage system is used to release energy, the energy being released as in the first operating phase. [2] Method according to claim 1, wherein the battery energy storage system comprises an inverter connected to the battery modules and the energy is delivered to the inverter in the first operating phase, The energy is also delivered to the inverter in the second operating phase. [3] Method according to claim 1 or 2, wherein the second operating phase is started manually or automatically. [4] Method according to one of the preceding claims, wherein the inverter is connected to a power grid. [5] Method according to one of the preceding claims, wherein the second operating phase takes place until a residual voltage of 0V is reached in the battery modules. [6] Method according to claim 5, wherein the second operating phase is followed by a third operating phase, wherein the battery modules have two battery module poles, wherein in the third operating phase the two battery module poles are short-circuited. [7] Method according to claim 6, wherein the short circuit of the two battery module poles is effected via an internal short circuit. [8] Method according to claim 6 or 7, wherein after the short circuit the battery modules are prepared for removal. [9] The method of claim 8, wherein the battery modules are recycled after removal. [10] Battery energy storage system comprising a plurality of battery modules, wherein the energy storage system is designed to carry out the method according to one of claims 1 to 9.
Citation Information
Patent Citations
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