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Method for charging sealed lead-acid accumulator in valve-controlled type

A technology of lead-acid battery and charging method, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc. It can solve the problems of battery dehydration, internal resistance increase, unreasonable charging mode, etc., and achieve an increase in charging speed , reducing the effect of polarization

Inactive Publication Date: 2008-09-17
浙江华源电力电子技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of battery has the disadvantage of short service life, generally only about one year
According to the research on the charging and discharging process of the battery and the analysis of the discarded valve-regulated sealed lead-acid battery, it can be known that there are three main reasons for its failure: one is due to long-term insufficient charging, the positive and negative plates deposit large volume, Active PbSO 4 crystal, the battery voltage is high during charging, and the effective capacity of the battery is small; the second is long-term repeated overcharging or floating charging, the battery loses water seriously, and the internal resistance increases so that it cannot be recharged; The voltage inconsistency between the batteries caused by the increased dispersion of internal resistance causes the performance of the battery pack to deteriorate
The cause of the three failure causes of valve-regulated sealed lead-acid batteries is the unreasonable charging mode included in the charging method of valve-regulated sealed lead-acid batteries.

Method used

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  • Method for charging sealed lead-acid accumulator in valve-controlled type

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Use three 6-DZM-10 accumulators in series to charge the accumulator group, start charging with a large current of 0.3CA and constant current, when charging to 60% of the last discharge capacity, the charging current is changed to a pulse current, and Depolarization pulses are inserted intermittently between charge pulses. When charging to 70% of the last discharge capacity, adjust the ratio of the charge pulse to the previous depolarization pulse to 6:1, and when charging to 85% of the last discharge capacity, adjust the ratio to 4:1. When charging to 95% of the last discharge capacity, this ratio is adjusted to 2.5:1, and the charging is terminated when it is detected that the charging voltage of the single battery is 2.44. After testing, the temperature rise of the battery pack during the charging process was 4.3K, and the charging capacity was 103% of last week.

[0017] Carry out charging with this method for 100% DOD cycle 350 times, measured: the te...

Embodiment 2

[0021] Embodiment 2: Charge the battery pack with three 6-DZM-10 batteries connected in series, start charging with a large current and constant current of 0.5CA, when charging to 70% of the last discharge capacity, change the charging current to a pulse current, and Intermittently insert depolarization pulses between charging pulses, and at the same time adjust the power ratio between the charging pulse and the previous depolarization pulse to 7:1, and adjust this ratio when charging to 85% of the last discharge capacity When charging to 95% of the last discharge capacity, this ratio is adjusted to 3:1, and when the charging voltage of the single battery is detected to be 2.46V, the charging is terminated. After testing, the temperature rise of the battery pack during the charging process was 4.6K, and the charging capacity was 105% of last week. Charged with this method for 100% DOD cycle 350 times, still reach the rated capacity.

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Abstract

Charging begins at large constant electrical current. When charged capacity reaches to 60-70úÑ of discharged capacity at previous cycle, then charging is carried out by using amplitude pulse current charge technique, which uses depolarization pulse with gaps. When voltage of single accumulator reaches to 2.44-2.46V, charging procedure is ended. The invention eliminates factors such as deficient charging for long time, reiterative over charging or float charging, large discretion of internal resistance of cascaded accumulators etc, which cause malfunction of accumulators. The method possesses advantages: more than 95úÑ of beta-PbO2 in active material of positive pole plate, controllable discharged capacity at this cycle equal to 103-105úÑ capacity at previous cycle, adjustable evened maximal voltage difference. The invention prolongs service life of accumulator more than one time.

Description

technical field [0001] The invention relates to a charging method for a valve-controlled sealed lead-acid storage battery, which belongs to the direct conversion method between chemical energy and electric energy. Background technique [0002] Valve-regulated sealed lead-acid batteries (VRLA) are widely used because they are cheap and easy to recycle. For example, most electric bicycles currently on the market are equipped with this type of battery. However, this kind of storage battery has the disadvantage of short service life, generally only about one year. According to the research on the charging and discharging process of the battery and the analysis of the discarded valve-regulated sealed lead-acid battery, it can be known that there are three main reasons for its failure: one is due to long-term insufficient charging, the positive and negative plates deposit large volume, Active PbSO 4 crystal, the battery voltage is high during charging, and the effective capacity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 刘宗光林涛
Owner 浙江华源电力电子技术有限公司