Power battery pack and control system and control method thereof

Abstract

The invention discloses a power battery pack. The power battery pack is characterized in that a first single battery of each battery string of the power battery pack is connected with an operational amplifier by a first series switch, is connected with a second single battery by a second series switch and is connected with the operational amplifier by first and second parallel switches, each first shielded switch is connected with two ends of a series structure in parallel, and each series structure comprises the corresponding first single battery and the corresponding second series switch; structures of the other single batteries are identical to one another, each single battery is connected with the corresponding next single battery by the corresponding series switch and is connected with the corresponding operational amplifier by the two corresponding parallel switches, each shielded switch is connected with two ends of the corresponding series structure in parallel, and each series structure comprises the corresponding single battery and the corresponding series switch of the single battery; one end of each switch is connected with a main cathode of the corresponding battery string, the other end of each switch is connected with a main anode of the corresponding battery string by a super-capacitor, and cathodes of the super-capacitors are connected with cathodes of the operational amplifiers. The invention further provides a control system with the power battery pack and a control method. The power battery pack, the control system and the control method have the advantage that the service lives of the single batteries can be prevented from being shortened due to faults of a certain battery.

Description

technical field [0001] The invention relates to the field of automobile power, in particular to a power battery pack; the invention also relates to a power battery pack control system and a power battery pack control method. Background technique [0002] The low-level battery connection structure of the traditional BMS (Battery Management System) system generally adopts the form of parallel first and then series, and an active / passive equalization system is added to ensure the consistency of the entire battery system operation. Although the structural balance of traditional battery packs in parallel first and then in series is easy to realize and has good consistency, it also has the following defects: [0003] 1. The realization of energy balance between parallel monomer batteries will lead to an increase in the number of charge and discharge of the battery and a decrease in battery life. [0004] 2. A faulty short circuit of a single battery cell will become a parallel lo...

AI Technical Summary

Problems solved by technology

[0003] 1. The realization of mutual energy balance between parallel monomer batteries will lead to an increase in the number of charge and discharge of the battery, and the battery life will decrease

[0004] 2. A faulty short circuit of a single battery cell will become a parallel load and affect the entire battery pack

[0005] 3. When a single battery cell fails, it will seriously affect the remaining unfailed batteries, and the process of energy flow will cause great energy waste

[0015] Over-discharge means that if the battery exceeds the end-of-discharge voltage value of the battery during the discharge process and continues to discharge, the internal pressure of the battery may increase, and the reversibility of the positive and negative active materials will be damaged, causing the capacity of the battery to decrease. obviously decrease

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