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AN-1052 Datasheet(PDF) 4 Page - Cymbet Corporation |
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AN-1052 Datasheet(HTML) 4 Page - Cymbet Corporation |
4 / 10 page AN-1052: Operating the EnerChip™ in High Temp. Environments ©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com Doc AN-72-1052 Rev A Page 4 of 10 Figure 4: EnerChip Capacity Loss as a Function of Temperature and State of Charge Figures 4 and 5 illustrate the effects of time at temperature on the capacity loss. Capacity loss from the cell can be both recoverable and non-recoverable. Recoverable capacity loss is that portion that can be replaced on the subsequent charge cycle and becomes available on the following discharge cycle. The non-recoverable portion of capacity loss is just that: Once it is lost, it can not be recovered on subsequent charge-discharge cycles. As depicted in Figure 4, cell capacity loss is strongly dependent on temperature and state of charge. By maintaining a lower state of charge on the cell, the deleterious effects of temperature can be offset considerably. This is true for both recoverable and non-recoverable capacity loss. Figure 5 presents the data in another form, with stand time being the dependent variable and all data points representing stand time at 70°C. The loss rate over time at temperature is a logarithmic function. Again, note the significant reduction in capacity loss (both recoverable and non-recoverable) by maintaining a lower state of charge, especially over extended time at temperature. The data here was collected at several intervals, including 6 months of continuous exposure to 70°C. In a typical application, leaving the cell in this ‘floating’ condition is achieved by disabling the EnerChip CC charge pump after charging the EnerChip to a full or partial state of charge, leaving the EnerChip terminal voltage to float, as opposed to maintaining a constant bias on the cell as would be the condition when leaving the charge pump enabled at all times. The effects on cell performance as a function of constantly biasing the EnerChip - versus allowing the terminal voltage to float - are described next. |
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