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A method for replacing failed batteries in electric vehicle battery maintenance

A technology for electric vehicles and storage batteries, which is applied to electric vehicles, battery/fuel cell control devices, vehicle energy storage, etc., can solve the problem of battery charging capacity reduction and achieve the effect of simple replacement and consistency

Active Publication Date: 2017-12-26
河南豫清新能源产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the reserved capacity is too high, the charging capacity of the entire battery pack will also be clamped to reduce

Method used

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  • A method for replacing failed batteries in electric vehicle battery maintenance

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Experimental program
Comparison scheme
Effect test

Embodiment

[0032] A method for replacing a failed battery in the maintenance of an electric vehicle storage battery, the specific replacement steps are:

[0033] 1) Use the battery online detection system of the battery to locate the backward battery, find out the failed battery, and use the BMS system in the battery to record the voltage U value and the corresponding current value of the battery during the discharge process for storage;

[0034] 2) Use the same current value recorded by the BMS system to detect the load current of the spare battery. If the voltage is higher than the U value, it needs to be discharged to the U value state with the same current; if the voltage is lower than the U value, the discharge detection will reach In the U state, a spare battery with the same dynamic load capacity is obtained;

[0035] 3) Replace the spare battery obtained in step 2) with the failed battery.

[0036] The battery online detection system includes a control module, a monitoring modul...

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Abstract

The invention relates to a method for replacing a failure accumulator in maintenance of an electric automobile accumulator. The method is characterized in that the consistency of a replacing accumulator and an original accumulator is kept; on a BMS of the original accumulator, a voltage value U and a corresponding current value of the accumulator in the discharging process are recorded, the spare accumulator is detected through a same load current during replacing, if the voltage is higher than the value U, discharging needs to be conducted to the value U state through the same current; if the voltage is lower than the value U, charging needs to be conducted to enable the spare accumulator to reach the U state during discharging detecting; and the dynamic load capacity of the accumulator is measured, and accumulators with the same dynamic load capacity can be combined in use. The method has the advantages that the consistency of the capacity of an accumulator pack before and after replacing is guaranteed, and the replacing method is simple.

Description

technical field [0001] The invention belongs to the technical field of battery detection, and in particular relates to a method for replacing a failed battery in the maintenance of an electric vehicle battery. Background technique [0002] In practical applications, lithium batteries often need to use multiple cells in series to meet the voltage requirements. At present, because the battery grouping technology is not good enough and the consistency of the batteries is difficult to be guaranteed, with the increase in the number of charge and discharge cycles, the gap between batteries The difference will become larger and larger, resulting in many problems in the SOC calculation and control strategy of the battery management system, which will affect the service life of the battery pack. We call a battery that is much less consistent with other single batteries in the battery pack a failed battery. If the failed battery can be found or predicted in advance, it will be of grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18
CPCB60L58/10Y02T10/70
Inventor 宁宏军段万普
Owner 河南豫清新能源产业有限公司