Storage battery serial bus apparatus and charge and discharge control method

Abstract

The invention discloses a storage battery serial bus apparatus and a charge and discharge control method. The apparatus comprises a serial bus, battery cells, battery cell cut switches, battery cell fling switches, battery cell voltage detecting points and a computer. The battery cell cut switches are all serially connected on the serial bus. The two ends of each battery cell are in parallel connection in a way to respectively correspond to each battery cell cut switch. Each battery cell fling switch is respectively connected between the anode of the corresponding battery cell and the serial bus in a serial way. Battery cell voltage detecting points are connected among the two ends of each battery cell and the computer. The over-charge problem during a series-connected batteries charging process can be effectively prevented. Meanwhile, the over-discharge phenomena when the storage battery is in use can be also prevented. Storage battery packs are effectively protected. The problem caused by the difference between battery cells is solved. The technical difficulties of insufficient charging of series-connected storage battery packs and incomplete discharging during a storage battery using process are prevented. The service lifetime of the storage battery pack is prolonged.

Description

technical field [0001] The invention relates to an energy storage battery technology, in particular to a storage battery serial bus device and a charging and discharging control method. Background technique [0002] Working in series can increase the voltage and reduce the current, thereby reducing the loss in the line. At the same time, it overcomes the defect that the high-voltage battery discharges to the low-voltage battery under the parallel working state, and improves the efficiency. Due to the production process and other reasons of the battery cells, there are differences in the electrolyte density and electrode equivalent resistance between different cells. The capacity of each monomer is different, which in turn affects the work of the entire battery pack. The individual differences of the single battery will lead to the different capacity of the single battery after a long time of use. When charging, the single battery pack with low capacity is more likely to be ...

AI Technical Summary

Problems solved by technology

Due to the production process and other reasons of the battery cells, there are differences in the electrolyte density and electrode equivalent resistance between different cells. The capacity of each monomer is different, which in turn affects the work of the entire battery pack

The individual differences of the single battery will lead to the different capacity of the single battery after a long time of use. When charging, the single battery pack with low capacity is more likely to be overcharged, which will intensify the vulcanization of the battery board and lead to the failure of the battery pack. The shell bulges and deforms, which has a serious impact on the life of the entire battery pack. When in use, it is also easy to over-discharge the low-capacity single battery packs connected in series, resulting in large internal resistance and very thin electrolyte concentration. The inside and surface of the electrode plate are almost neutral. When over-discharged, the internal resistance tends to heat up, and the volume expands. When the discharge current is large, the heat is obvious, and even the heat is deformed, resulting in poor charging recovery ability.

[0003] Due to the inconsistency of the capacity of the single batteries in the traditional series battery pack, when charging, as long as one single battery in the battery pack reaches the rated charging voltage, the other single batteries cannot continue to charge, otherwise it will cause the battery that has reached the charging requirement to be charged. The battery is overcharged, and when it is discharged during use, as long as one of the battery cells in the battery pack reaches the termination discharge requirement, the other monomer batteries will stop discharging, otherwise it will cause the battery cell that has reached the termination discharge to be discharged. Overdischarge occurred

Overcharging and overdischarging will not only cause great damage to the battery, but also make it impossible to fully charge and discharge the large-capacity single battery, reducing the capacity of the entire battery pack

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