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OBJECTIVES The specific objectives of the 8.3kWh testing program can be stated as follows: • • • Evaluate performance and make comparisons —between submodules and the full 45kWh battery module. —between different submodule assemblies. —between submodules and single cells. 2. round-trip electrochemical energy efficiency. Optimize conditions to reach 200mAh/cm capacity at 65% minimum Develop meaningful methods of stack evaluation. These objectives were pursued by selecting various combinations of operating condi tions and electrolyte compositions, and testing each under carefully controlled conditions that matched or could be achieved in the full size 45kWh module. Another criterion for selection was that of maintaining acceptably low levels of hydrogen evolution. SYSTEM DESIGN AND OPERATION Submodule Design The 8.3kWh submodule consists of ten bipolar unit cells in series. Each unit cell contains 22 pairs of electrodes. The profiled (machined cavity) type PG-60 porous- graphite chlorine electrodes are assembled with the respective ATJ graphite zinc electrodes into a bipolar comb-type structure. This stack assembly is contained in a vacuum-formed plastic submodule tray. The assembly is illustrated in Figure 24-1. The submodule stack and the required electrolyte sump are arranged in a battery case on two levels as shown in Figure 24-2. A photographic view of the assembly with cover removed is shown in Figure 24-3. The main body of the case is permanently assembled. The top and bottom removable covers are sealed by use of Viton 0-Rings and six clamp screws. In practice, the bottom cover normally remains in place. The top cover is removed routinely for inspection or repair of the submodule. The O-ring sealing design provides a satis factory seal for vacuum operation. 24-2PDF Image | Development of the Zinc-Chlorine Battery for Utility
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