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A method for recovering the capacity of batteries with extended storage

A recovery method and battery capacity technology, applied in the measurement of electrical variables, secondary battery repair/maintenance, secondary battery charging/discharging, etc. The operability and applicability are strong, the battery management cost is saved, and the process is simple and controllable.

Active Publication Date: 2021-01-08
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ①Acid replenishment repair: add high-concentration sulfuric acid to the battery, the battery capacity will rise rapidly, but the maintenance time is very short, and the liquid electrolyte will seriously corrode the battery plate, which will speed up the scrapping speed of the battery
If the electrolyte density of the battery is too high, only water will be decomposed during charging, and it will be difficult for the active material to fully recover its performance
[0007] ③High-frequency pulse: use high current, high voltage, and high frequency for repair, which is prone to heat generation, swelling, swelling, powder removal, low repair rate, serious damage to the plate, and short battery life
Because the voltage is too large, it is dangerous, and it is easy to make the battery generate a lot of heat, aggravate the loss of water, and have great damage to the active material.
[0009] For batteries stored for an extended period of time, when they are not put into use, the water and acid inside the battery are basically not lost, so it is meaningless to use the above ①-② repair methods
In addition, the valve-controlled sealed battery needs to be pried off, and the control of the amount of acid water added is difficult for ordinary people to grasp and control. Improper disposal will also bring potential hidden dangers to quality; and ③-④ (or combined with ①-②) The repair method uses high-frequency pulse and high-current and high-voltage charging methods, which are rarely used due to battery damage and safety issues such as heat generation, water loss, and even swelling during the repair process.

Method used

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  • A method for recovering the capacity of batteries with extended storage
  • A method for recovering the capacity of batteries with extended storage
  • A method for recovering the capacity of batteries with extended storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The lead-acid battery 6-EVF-100 for electric road vehicles has been stored for nearly 1 year. The basic parameters of the battery are: rated voltage 12V (6 cells), rated capacity 100AH, and rated current 33.3A (3 hour rate current).

[0028]1) Solve the reference model curve of battery internal resistance / rated capacity ratio δ and discharge depth U

[0029]In the first step, given the new battery, the battery stored for six months, one year and two years, the internal resistance values ​​of 3.4mΩ, 4.5mΩ, 7.8mΩ, and 13.8mΩ are measured respectively; calculate the ratio of the internal resistance of the battery to the rated capacity δ1, δ2, δ3 , Δ4 are 3.4×10-2mΩ / AH, 4.5×10-2mΩ / AH, 7.8×10-2mΩ / AH, 13.8×10-2mΩ / AH;

[0030]The second step, given the new battery, storage for half a year, one year, and two years of battery discharge depth U1, U2, U3, U4 values ​​are 1.67V, 1.00V, 0.67V, 0V (calculated based on a single cell 2V rated voltage);

[0031]The third step is based on the reference mod...

Embodiment 2

[0034]The lead-acid battery 6-EVF-100 for electric road vehicles has been stored for nearly 1 year. The basic parameters of the battery are: rated voltage 12V (6 cells), rated capacity 100AH, and rated current 33.3A (3 hour rate current).

[0035]1) Implementation of repair process

[0036]The first step is to measure the internal resistance of the battery as 7.7mΩ (milliohm). Calculate the internal resistance / capacity ratio δ0 as 7.7×10-2mΩ / AH;

[0037]In the second step, from the reference model curve of the battery internal resistance / rated capacity ratio δ and the depth of discharge U, the U value corresponding to δ0 is found to be 0.67V, and the value of U0 corresponding to the rated voltage 12V battery is calculated as 0.67×6= 4.02V;

[0038]The third step is to calculate the four-stage cascade discharge current whose values ​​are 33.3A (1.0I), 16.7A (0.5I), 8.35A (0.25I), 4.175A (0.125I);

[0039]The fourth step is to calculate the current value of the four-stage cascade constant current vo...

Embodiment 3

[0048]The lead-acid battery 4-EVF-150 for electric road vehicles has been stored for nearly 1.5 years. The basic parameters of the battery are: rated voltage 8V (4 cells), rated capacity 150AH, and rated current 50.0A (3 hour rate current).

[0049]1) Implementation of repair process

[0050]The first step is to measure the internal resistance of the battery as 10.2mΩ. Calculate the internal resistance / capacity ratio δ0 as 6.8×10-2mΩ / AH;

[0051]In the second step, from the reference model curve of the battery internal resistance / rated capacity ratio δ and the discharge depth U, the U0 value corresponding to δ0 is found to be 0.83V, and the discharge repair depth U value corresponding to the rated voltage 8V battery is calculated to be 0.83×4 = 3.32V;

[0052]The third step is to calculate the four-stage cascade discharge current and its values ​​are 50.0A (1.0I), 25.0A (0.5I), 12.5A (0.25I), 6.25A (0.125I);

[0053]The fourth step is to calculate the current value of the four-stage cascaded const...

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Abstract

The invention discloses an overdue storage battery capacity recovery method. The optimal discharge depth value of a repaired battery is determined by measuring the internal resistance of the battery before repair, predicting the internal vulcanization degree of the battery and comparing the relation curve of the internal resistance / rated capacity ratio and the discharge depth. According to the overdue battery repaired by the method, the storage period is about one year, and the capacity is recovered to a new battery state. When the battery is stored for two years, the capacity is recovered tomore than 90% of that of a new battery. No obvious temperature rise or heave phenomenon exists in the repairing process, no damage is caused to the strength of active substances, and the expected service life is ensured. Various external substances such as repair liquid do not need to be added in the repair process, the process is simple and controllable, and operability is high. Therefore, the old battery is repaired as good as new, the after-sales market battery management cost is saved, resources are effectively utilized, and waste is reduced.

Description

Technical field[0001]The invention relates to the technical field of lead storage battery production, in particular to a method for restoring the capacity of an over-storage battery.Background technique[0002]Due to the characteristics of lead-acid batteries, unused batteries need to be recharged for maintenance every month, especially under high temperature and humidity conditions. The manufacturer has a striking reminder in the battery manual. The excessive and deep self-discharge caused by long-term storage of batteries, combined with the incomplete initial charging of some new batteries, and the insufficient reduction of active materials, the battery sulfation has become an inevitable trend. This kind of hard white lead sulfate crystals formed on the plate is difficult to convert into active lead sulfate. This is the irreversible lead sulfate salting of the plate, which is called "sulfide" for short. The main reason for the formation of such lead sulfate crystals is the self-disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44G01R31/379G01R31/388G01R31/389
CPCG01R31/379G01R31/388G01R31/389H01M10/4242H01M10/44Y02E60/10
Inventor 陈群方明学李越南高根芳周文渭庄建胡曙代飞刘海凤宋文龙
Owner TIANNENG BATTERY GROUP
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