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Charging-discharging automatic balancing method for serial power lithium battery

A lithium battery pack, automatic equalization technology, applied in secondary battery charging/discharging, battery circuit device, secondary battery repair/maintenance, etc., can solve problems that have never existed before, and achieve the effect of slowing down the degradation rate

Inactive Publication Date: 2007-08-29
苏州市三环技贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has never been a good plan for individual single cells that are severely over-discharged, especially in the early stage of performance degradation of individual single cells in the later stages of use.

Method used

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  • Charging-discharging automatic balancing method for serial power lithium battery
  • Charging-discharging automatic balancing method for serial power lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Example: A charging and discharging automatic equalization method for series power lithium battery packs

[0026] As shown in Figure 1, a charge-discharge balance control unit is set up for each single battery in the series battery pack, and each single battery in the battery pack is controlled in a one-to-one manner, and each charge-discharge balance control unit is in parallel operation state to balance and coordinate the work of each single battery.

[0027] In the charging operation, it is a major feature of the present invention to charge each single battery separately in a parallel charging manner. During the charging process, the charge-discharge balance control unit continuously detects the corresponding instantaneous voltage v of the single battery t , and with the set termination charging voltage v 停 (4.2V, the error is less than ±1%) for comparison, when the instantaneous voltage v of the single battery is detected t reaches the set termination charging vo...

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PUM

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Abstract

The invention regards each single battery in cascaded battery set (CBS) as a small heart. Only when each small heart is normal, integral heart combination can work effectively. Based on the comprehension, the invention sets up a control unit for balanced charging and discharging (CUBCD) for each single battery in CBS so as to form one to one mode to control each single battery in CBS. In parallel charging mode, being controlled by CUBCD, the invention charges each single battery. In discharging operation, being monitored by CUBCD, the invention activates inverter circuit to complement charging operation according to magnitude of energy needed by using energy of battery set self if over discharging occurs on a single battery. Harmonizing charging and discharging operations, the invention keeps synchronous charging and discharging operation among batteries so as to guarantee safe operation of system, prolong service life of battery set.

Description

technical field [0001] The invention relates to the technical field of charging and discharging equalization of series-connected power battery packs, in particular to an automatic charge-discharging method for series-connected lithium battery packs. Background technique [0002] In today's world, oil resources are becoming increasingly scarce and air pollution is becoming more and more serious. As a secondary energy source, series power battery packs have attracted more and more attention. However, the individual differences of the battery cells will cause serious overcharge and overdischarge problems during the use of the battery pack, and even cause damage to the entire system. This is because the terminal voltage of the battery pack has not yet reached the termination charging condition, and some of the single cells have been charged, and this part of the single cells must be in an overcharged state during the continuous charging process, resulting in an overcharge proble...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 孙璞鲍公舜
Owner 苏州市三环技贸有限公司
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