Battery management system

Abstract

The invention relates to a battery management system. The battery management system comprises a group of N serially-connected storage batteries, N battery repair modules and (N-1) battery balance modules, wherein each storage battery is connected in parallel with one battery repair module, so the N storage batteries correspond to the N battery repair modules; and two storage batteries are connected with one balance module, so the N storage batteries correspond to the (N-1) battery balance modules. The battery management system is applied to a lead-acid battery pack and used for repairing and balancing a 2-volt battery pack, and is a power management system which is capable of improving the charging and discharging characteristics of a lead-acid battery, preventing polar plate from being vulcanized and realizing bidirectional lossless balanced charging and discharging of the serially-connected battery pack; therefore, the service life of the lead-acid battery can be really prolonged.

Description

technical field [0001] The invention relates to a lead-acid battery management system. Background technique [0002] Lead-acid batteries are widely used in fields such as electric power, communications, railways, petroleum, aviation, water conservancy, coal, geology, medical care, rail transit, and national defense because of their mature technology, low price, high safety, and renewable cycles. , but at present, according to different usage and conditions, most lead-acid batteries do not play their best performance, which is manifested in the following aspects: [0003] 1. Vulcanization is the main reason for the deterioration of single-cell lead-acid batteries [0004] When a normal lead-acid battery is charged, lead sulfate forms lead oxide, which is reduced to lead sulfate during discharge. Lead sulfate is a substance that is very easy to crystallize. When the battery is over-discharged or the static idle time is too long, it will "clump into groups" and form small cry...

AI Technical Summary

Problems solved by technology

[0007] 2. Failure to charge in time after discharge;

[0008] 3. Insufficient charging;

[0011] 6. Dried up or added electrolyte concentration is too high

[0013] 2. The imbalance of charge and discharge can shorten the service life of the battery pack in series

[0018] 1. The single battery is 2V

[0019] 2. Batteries need to be used in groups, 24 or up to 36 in series as a group

[0020] 3. Large battery capacity, generally 280Ah-1000Ah

Some adopt the multi-channel output mode of electric energy to transmit the excess energy to the general circuit. Therefore, most of the schemes have the disadvantages of complex control structure composed of circuits, difficult implementation and inconvenient maintenance.

Although some can achieve automatic equalization by collecting voltage for single-chip control, but because there is floating electricity at both ends of the battery during charging, the voltage collection point is inaccurate, which not only affects the balance of the battery, but also frequently and repeatedly operates the equalization switch, which will cause energy loss. In addition, even if the energy balance is achieved and the battery pack is balanced, the vulcanization caused by the untimely charging of the battery or the long-term storage cannot be eliminated, so the effect of equalization is that the capacity of the entire battery pack decreases as a whole. Really prolong the actual service life of the battery pack; in addition, because the main controller MOS tube needs at least 5V power supply, it still cannot perform balanced control on 2V batteries

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