Lithium battery self-discharge screening method

A screening method and self-discharge technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems that the voltage of the battery is difficult to reach the true value and the accuracy is low, and achieve a short detection period, convenient production and operation, and method easy-to-achieve effects

Active Publication Date: 2014-10-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0004] "A self-discharge screening method for lithium iron phosphate battery" disclosed in Chinese patent CN102117937A and "Detection and sorting method for self-discharge performance of lithium iron phosphate battery" disclosed in CN102303023A both use voltage drop within a certain period of time to determine self-discharge Large batteries, but everyone knows that after the battery is charged and discharged, due to polarization and other reasons, it is difficult for the voltage of the battery to reach its true value in a short period of time. The self-discharge of the battery is determined by the voltage difference between the front and back of the battery within a period of time. Its accuracy is very low

Method used

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Embodiment

[0023] The embodiment of the present invention provides a lithium battery self-discharge screening method, which specifically includes the following steps:

[0024] (1) After the battery filled with electrolyte is left to stand for a certain period of time, the pre-charge formation is started, and the total battery capacity C1 after the pre-charge formation is recorded;

[0025] (2) Place the pre-charged battery in a constant temperature and normal pressure workshop at 48-52°C for aging, and the aging time T1 is 2-3 days;

[0026] (3) After the aging time is up, take the battery out and place it under normal temperature and pressure for a certain period of time to fully reduce the battery temperature to normal temperature;

[0027] (4) Under the normal temperature environment, the battery is discharged with a constant current until its voltage value is V1 and then stopped, then the battery is charged with the same constant current until the cut-off voltage is V2 and the cut-of...

Embodiment 2

[0035] (1) Take 30 10Ah lithium batteries to be converted into, charge the batteries at a constant current of 0.2A for 5 hours in an environment of normal temperature and pressure, and then charge them at a constant current of 2A for 3 hours, and record the charging capacity C1 of the batteries;

[0036] (2) Then, put the battery in a normal pressure environment at 50°C for 3 days;

[0037] (3) After the time is up, take out the battery, take out the battery and place it under normal temperature and pressure for 8-15 hours to fully reduce the battery temperature to normal temperature;

[0038] (4) When discharging the battery with a constant current of 10A to 2.5V in an environment of normal temperature and pressure, stop discharging, record the discharge capacity C2 of the battery, and then charge the battery with a constant current of 10A and constant voltage in an environment of normal temperature and pressure Stop charging when the cut-off voltage is 3.7V and the cut-off c...

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Abstract

A lithium battery self-discharge screening method includes the steps that lithium batteries are charged in advance, the total capacity C1 of the batteries is recorded, constant-temperature aging is carried out on the batteries, the aged batteries are discharged through constant current under the environment with normal temperature, the batteries are charged through the same constant current, the capacity C2 obtained after constant current discharging is carried out and the capacity C3 obtained after charging are recorded respectively, C1 minus C2 is the capacity difference delta1, and then K1 is calculated by dividing delta1 by T1; batteries of which K1 is within the qualified range are directly transferred to the next process; constant-temperature aging is carried out on the batteries which are transferred normally; the aged batteries are discharged through the constant current under the normal temperature and normal voltage, and the capacity C4 obtained after discharging is finished is recorded; C4 minus C3 is delta2, K2 is calculated by dividing delta2 by T2, and batteries of which K2 is within the qualified process range are batteries small in self discharge. Through changes of battery capacities within a certain period, lithium batteries high in self discharge are effectively selected out through two times of screening, the method is simple and easy to implement, and production and operation are convenient.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a lithium battery self-discharge screening method. Background technique [0002] Lithium batteries are more and more widely used in mobile phones, power tools and other products. Especially in recent years, people are constantly pursuing low-carbon life, and at the same time, traditional energy sources such as oil and coal are becoming less and less. As a clean, environmentally friendly and low-carbon lithium battery, it has become an effective solution to the current environmental and energy problems. The method has attracted people's attention, and some traditional tools such as public transportation and family mobility cars have gradually integrated into our daily lives. [0003] Due to the low voltage and capacity of lithium battery cells, multiple lithium batteries must be connected in series and parallel to meet the requirements of these tools when they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 李瑜余水陈萍孟令奎徐小明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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