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PROJECT DESCRIPTION EPRI PERSPECTIVE EPRI, DOE and EDA are engaged in a closely coordinated major program to develop a zinc-chlorine battery for utility energy storage. The EPRI portion of this program is to provide the necessary technology base; the goal of the DOE-sponsored portion of the program is to design and construct a 5-MWh battery for BEST facility test ing. The EPRI-sponsored work is covered in a 39-month, $7.6 million contract initiated in January, 1977; the costs are equally shared by EDA and EPRI. The DOE portion is covered in a separate 33-month, $11.5 million contract with EDA initiated in January, 1979. This report reviews progress of the EPRI-EDA contract for the period from January, 1977 through March, 1978. PROJECT OBJECTIVE The ultimate objective of this effort is the commercialization of battery energy storage systems for utility application. A major objective was to build and test a 45-kWh module. This module is the basic building block of a battery energy storage system. Further objectives were to develop the components and subsystems for this module. In addition, work to demonstrate cycle-life potential, to identify failure mechanisms, and to ascertain the economic viability of the technology has continued. PROJECT RESULTS The scale-up hardware from a 20-kWh breadboard system (late-1976) to a 45-kWh fully- integrated battery module (early-1978) was accomplished. However, the performance of the first 45-kWh module was low; energy efficiency was only about 50% compared to a design goal of 63%. This problem is receiving major attention in the present phase of the project. Recent results of cell tests suggest that the problem can be resolved. Four more 45-kWh modules will be tested in 1979. Performance of these will give us insight into the status of the technology and the likelihood of technical success. Before a 5-kWh battery prototype can be fabricated and tested in the BEST facility, several questions need to be answered and some major problems remain to be solved. vPDF Image | Development of the Zinc-Chlorine Battery for Utility
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