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Relationship between battery cycle life and charging

Return Listsource:Gratene date: 2022-06-17

Relationship between battery cycle life and chargingA potential difference to the battery is contrary to the discharge direction, and the self-generating battery reaction will be reverse. In some cases, there is only a portion of the renewable to form the original component of the battery, while the remainder is consumed by the unnecessary side react. Although it is unlikely to distinguish the “once” and “secondary” system, there is indeed a large number of completely non-reversible electrodes, such as low hydrogen overpotential metals such as magnesium in aqueous electrolyte.

Because of the thermodynamics or kinetics, low hydrogen is preferentially on the reduction of magnesium ions, so it is impossible to charge the MG (S)} MGT electrode. When charging, the battery voltage is higher than its electromotive force. For some battery systems, after the constant current is fully charged, with the beginning of the electrode excessive reaction, the voltage has risen sharply; it is not obvious to other batteries.

For actual battery systems, each particular battery system corresponds to an appropriate charging system, and measures the battery’s charging acceptance capability according to battery capacity and charge and discharge cycle.

The cycle life refers to the number of charge and discharge cycles that the battery can withstand before its performance (with its capacity and energy efficiency measurement) falls to any limit. Shallow level discharge (<20%)时电池有较长的循环寿命。电池的标准侧试中一般需要以额定容量的75%或80%来放电。 The internal discharge reactions in the battery can cause rated capacity loss. The rechargeable battery not only has a high cycle factor, but also meets other indicator requirements, especially if there is a good charging acceptance rate. Its control factors include exchange current, electrode surface area, nature, ohmic impedance, etc., which affect the size of the discharge current. Battery internal resistance is especially important during charging, high charging voltages can easily cause overheating of batteries and affect battery chemical and mechanical stability. Further, if a solid phase is formed during the charging process, the organizational structure must satisfy the size of stable, uniform, and non-dendritic (especially for metal phases, which can avoid internal short circuits). Due to the existence of side reactions, many secondary battery systems are only charged, that is, more than their theoretical capacity can be charged to achieve full charging state. The internal side reaction of the aqueous solution is usually precipitation of hydrogen and oxygen. The amount of the sub-reaction to generate water can sometimes be controlled by adjusting the relative capacity of the anode and the cathode. If there is gas generation, a measures must be taken to exclude or recombine (for sealing batteries). A set of batteries sometimes appear inconsistent with the capacity of each unit cell. Some batteries will be overcharge when this type of battery pack is charged. Some batteries are not full. More importantly, the lowest capacity battery may occur when depth discharge. This type of phenomenon is often partial battery, and does not appear on all batteries, but the damage to the battery system is disastrous, so some electrochemical and electrical anti-polar protection devices are required to be connected to the battery system.  Recommend:

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