Lithium battery pack service life prolonging system and method with constant-current and constant-voltage charging and discharging

Abstract

The invention provides a system and a method for prolonging the service life of a lithium battery pack with constant-current and constant-voltage charging and discharging. The system for prolonging the service life of the lithium battery pack comprises a controller, a voltage acquisition module, an Nth series of cells for switching to the lithium battery pack, a switching module for balancing theNth series of cells, a power module and a constant-current constant-voltage charging and discharging module for charging and discharging the Nth series of cells in a constant-current and constant-voltage manner, wherein N is a positive integer, the voltage acquisition module is used for acquiring the voltage of each string of cells of the lithium battery pack respectively, an output end of the voltage acquisition module is connected with the controller, the control of the power module is connected with the controller, one end of the power module is connected with an output end of the constant-current constant-voltage charging and discharging module, the other end of the power module is connected with the Nth series of battery cells, and an input end of the constant-current constant-voltagecharging and discharging module is connected with the controller. After charging is completed, the voltage does not fall back or falls back consistently, and after discharging is completed, the voltage does not rebound or rebounds slightly and consistently, so the service life of the battery pack is greatly prolonged.

Description

technical field [0001] The present invention relates to the technical field of battery packs, in particular to a lithium battery pack life extension system with constant current and constant voltage charging and discharging, and also relates to a life extension system based on the lithium battery pack life extension system with constant current and constant voltage charging and discharging Extend method. Background technique [0002] In the prior art, multiple batteries are usually combined to form a battery pack to meet the high current and voltage requirements, but due to but not limited to the following factors: [0003] 1. Lithium battery pack production matching problems (including voltage, internal resistance, capacity); [0004] 2. Due to the unsatisfactory balance effect of the current protection board, it is extremely unsafe; [0005] 3. The battery pack protection board only protects against voltage. [0006] This will affect the service life of the battery pack...

AI Technical Summary

Problems solved by technology

[0003] 1. Lithium battery pack production matching problems (including voltage, internal resistance, capacity);

[0004] 2. Due to the unsatisfactory balance effect of the current protection board, it is extremely unsafe;

[0005] 3. The battery pack protection board only protects against voltage

[0007] 1. Charge equalization, fully charge the internal voltage of the battery pack, charge the ternary material to 4.2V, and charge the lithium iron phosphate to 3.65V. Electricity, which brings safety problems, and when the charging is cut off, the battery voltage will drop, and the accuracy is poor;

[0008] 2. Discharge balance, drain all the internal voltage of the battery pack, put the ternary material at 2.75V, and put the lithium iron phosphate at 2.5V. This method is inefficient, and it is easy for customers to choose the appropriate voltage due to insufficient knowledge of the battery. Empty, which brings safety problems, and when the discharge ends, the battery voltage will rebound, and the accuracy is poor;

[0010] The traditional charge-discharge equalizer can equalize independently, but it cannot guarantee that the voltage will bounce back consistently or not after discharge, which often results in a small battery pressure difference at the moment of equalization, but a rebound phenomenon will appear when the equalization is stopped.

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