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Using additives

Recently, there have been increasing reports on various additives that can increase battery capacity, but the vast majority are aimed at starting batteries with low requirements for deep charge discharge cycles. Some units also claim that their additives are not only beneficial for capacity, but can also improve the deep charge discharge cycle life of nickel hydrogen batteries. However, after contacting multiple such units, it is unclear whether it is due to technical confidentiality reasons, and they have never been able to explain the principle behind their additives adding new capacity while improving life.

The above are the commonly used methods for adding new capacity by various electric vehicle battery manufacturers, but apart from changing the external dimensions (which will not be feasible after national standards and regulations), there seems to be no way to balance capacity and lifespan. In this case, it is necessary to find a balance point between capacity and lifespan. Through investigation, it has been found that electric bicycle users mostly ride distances of 10-30km per day, and if they are further away, they will consider choosing other modes of transportation. Therefore, the principle in designing electric vehicle charging batteries should be to ensure that users who ride 10-30km per day have the longest battery life, and then consider capacity design based on this principle. At present, there are two important types of electric bicycles: 36V and 24V. Generally, the discharge current for riding is between 4-4.5A. Therefore, when conducting lifespan experiments, the power supply method uses two discharge methods: 5A discharge for 1.5 hours and 5.5A discharge for 1 hour. Through experiments, it has been proven that in order to achieve maximum lifespan under these two conditions, the 151 ` 94 ` 98 battery weighs 3.85-3.95kg, the 5A discharge time is between 115 minutes and 125 minutes, the 151 ` 99 ` 99 battery weighs 4.15-4.25kg, and the 5A discharge time is between 125 minutes and 135 minutes. Under this capacity, the open circuit voltage of the battery can be controlled at 13.95 minutes. Between 2-13.4V, the lower the capacity, the longer the lifespan will be affected by the increase in discharge depth. On this basis, increasing the capacity will also affect the lifespan due to various reasons mentioned above.

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