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Storage battery charging method

A charging method and battery voltage technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of battery service life impact, battery thermal runaway, thermal runaway, etc., to prevent charging thermal runaway, The effect of prolonging the service life and increasing the rate of water loss

Active Publication Date: 2011-10-05
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use conditions such as the depth of discharge, the magnitude of the discharge current, and the charging method of the charger during the use of the user have a significant impact on the service life of the battery, especially improper charging will lead to thermal runaway of the battery. or one of the main reasons for scrapping
At present, the charging method of the power battery is mainly the constant current-constant voltage-floating three-stage charging method. This charging method does not limit the charging time to prevent the battery from being undercharged, which leads to another extreme, the battery loses water seriously. Many batteries eventually fail due to dry electrolyte or thermal runaway

Method used

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Embodiment 1

[0020] refer to figure 1 Embodiment 1 of a battery charging method of the present invention, a battery charging method, is carried out in accordance with the following steps:

[0021] A. First measure the temperature T of the battery, according to U 限 =n[U 25℃ +k(T-25)] formula to calculate battery charging limit voltage U 限 value, where U 25℃ It is the battery charging limit voltage at 25°C, the range is 2.35~2.50V / cell; k is the temperature compensation coefficient, the range is -5~-2mV / °C; n is the number of cells connected in series; the battery is charged with constant current, The constant current value is 0.05 to 0.5 times the rated capacity value of the two-hour rate of the battery;

[0022] B. Collect battery voltage U every 600 seconds 实 , compare U 实 and battery charge limit voltage U 限 value, if U 实 ≥U 限 , then the battery enters the limited voltage charging stage and adopts U 限 Charging; if the battery voltage U 实 Battery charging limit voltage U not re...

Embodiment 2

[0026] refer to figure 2 Embodiment 2 of a battery charging method of the present invention, a battery charging method, is carried out in accordance with the following steps:

[0027] A. First measure the temperature T of the battery, according to U 限 =n[U 25℃ +k(T-25)] formula to calculate battery charging limit voltage U 限 value, where U 25℃ It is the battery charging limit voltage at 25°C, the range is 2.35~2.50V / cell; k is the temperature compensation coefficient, the range is -5~-2mV / °C; n is the number of cells connected in series; the battery is charged with constant current, The constant current value is 0.05 to 0.5 times the rated capacity value of the two-hour rate of the battery;

[0028] B. Collect battery voltage U every 600 seconds 实, compare U 实 and battery charge limit voltage U 限 value, if U 实 ≥U 限 , then the battery enters the limited voltage charging stage and adopts U 限 Charging; if the battery voltage U 实 Battery charging limit voltage U not re...

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Abstract

The invention discloses a storage battery charging method, which comprises the following steps of: measuring the temperature of a storage battery, calculating a limiting voltage, judging whether to enter a limiting voltage charging stage or not, and after entering the limiting voltage charging stage, judging whether the charging of the battery is finished or not according to time integration power and time integration current. The method has the advantages that: in the initial stage of cycle life of the storage battery, in the constant voltage charging stage of the battery, the charging current of the battery is exponentially normally reduced; the time integration charging power and the time integration charging current related in the charging method hardly produce influence on the charging of the battery, and ensure the battery can be normally sufficiently charged; by the charging method provided by the invention, the limitations of the time integration charging power and the time integration charging current force the charging limiting voltage to be exponentially reduced and force the charging current to be reduced to reduce water loss, prolong the service life and completely eradicate the occurrence of battery charging thermal runaway phenomena.

Description

technical field [0001] The invention relates to a storage battery charging method. Background technique [0002] Lead-acid batteries are widely used as power batteries for electric bicycles and electric vehicles because of their low cost and reliable technology. However, the use conditions such as the depth of discharge, the magnitude of the discharge current, and the charging method of the charger during the use of the user have a significant impact on the service life of the battery, especially improper charging will lead to thermal runaway of the battery. Or one of the main reasons for scrapping. At present, the charging method of the power battery is mainly the constant current-constant voltage-floating three-stage charging method. This charging method does not limit the charging time to prevent the battery from being undercharged, which leads to another extreme, the battery loses water seriously. Many batteries eventually fail due to dry electrolyte or thermal runaway...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 沈浩宇蔡晓祥陈建山
Owner CHAOWEI POWER CO LTD
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