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Lithium battery charging and discharging and equalization protection method

A charging and discharging, lithium battery technology, applied in the direction of charge balance circuit, battery circuit device, safety/protection battery circuit, etc. hidden dangers

Inactive Publication Date: 2017-10-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the charging of lithium battery packs, since lithium batteries are connected in series, they are usually charged by controlling the voltage at both ends of the battery pack, which will inevitably lead to consistency problems between batteries.
On the other hand, due to the poor anti-overcharge ability of lithium batteries, it is easy to cause overdischarge and overcharge problems of lithium batteries, which makes the charging safety of lithium battery packs have certain hidden dangers.

Method used

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  • Lithium battery charging and discharging and equalization protection method
  • Lithium battery charging and discharging and equalization protection method
  • Lithium battery charging and discharging and equalization protection method

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the drawings.

[0014] The battery charging and discharging and equalization protection method of the present invention is to control the charging process according to the change of the battery voltage during the charging process of the lithium battery, so as to achieve the effect of overcharging protection.

[0015] Such as figure 1 As shown, when the lithium battery is charged, the positive electrode is VIN+ and the negative electrode is VIN-. When charging, the charging current first passes through the chip IC-LT1004 to generate a constant 1.23V reference voltage V1.2. At the same time, the charging current generates two comparison voltages, VOF and VLF, by R2, R5, R7 and R3, R6, and R8, respectively, and its function is to compare with the reference voltage V1.2. Among them, VOF and V1.2 are compared through LM339 internal comparators 1, 2 and output by pins 1, 2; VLF and V1.2 are compared through ...

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Abstract

A novel lithium battery charging and discharging and equalization protection method includes a pedestal generator, a comparator set, a signal output and an over charge control portion. When a lithium battery is charged, the voltage change is monitored, and the charging current is control to realize equalization and protection effect. The lithium battery charging and discharging and equalization protection method is simple and easily understandable, and the discharging resistance can be adjusted at any time according to different battery capacities.

Description

Technical field [0001] The invention belongs to new energy technology and relates to a lithium battery charge balance control method and charge protection. . Background technique [0002] In the use of lithium batteries, in order to obtain corresponding power and energy, lithium batteries usually need to be used in series in large numbers to obtain greater capacity. For the charging of lithium batteries, there are charging methods such as constant voltage charging, constant current charging, multi-level constant current charging, constant voltage current limiting charging, and pulse charging. However, for the charging of lithium battery packs, since the lithium batteries are connected in series to form a group, charging is usually performed by controlling the voltage at both ends of the battery pack, which inevitably leads to consistency problems between the batteries. On the other hand, due to the poor overcharge resistance of the lithium battery, it is easy to cause the overd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014H02J7/0026
Inventor 孙亚琨姜殿波邹黎
Owner SHANDONG UNIV OF TECH