Method for pre-judging fault battery in power battery pack

A technology for power battery packs and battery packs, applied in the direction of measuring electricity, measuring electrical variables, and measuring devices, etc., can solve problems such as battery pack impact, reduce battery pack performance, and personnel safety hazards, and achieve the effect of improving safety

Active Publication Date: 2016-04-27
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the widespread promotion of electric vehicles, more and more attention has been paid to the safety of batteries. In the actual use of battery packs, in most cases, the poor performance of one battery affects the entire battery pack. When a battery with poor performance in the group reports a fault, it may happen that the high-voltage power is accidentally cut off during driving or the charging end is reached quickly during the charging process. For example, when an electric vehicle is driving at high speed, a single battery with poor performance may Continuous current discharge, the voltage drop is very fast, the vehicle or BMS system may perform corresponding fault protection actions, cut off the high voltage relay, make the electric vehicle lose power, and cause serious safety hazards to the safety of personnel on the vehicle
At the same time, when the battery pack is charging, the voltage of a single battery with poor performance may rise very fast, so that the charging cut-off condition is reached in advance and the charging ends. At this time, other batteries are not fully charged, which will affect the entire battery pack and reduce the battery life performance
At present, the maintenance of electric vehicle power battery packs at home and abroad is basically repaired and replaced after the fault is found. There is no effective method for predicting faults or poor performance batteries in advance.

Method used

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with embodiment.

[0018] Voltage is the most important manifestation of the performance of a single battery. The voltage of a single battery rises or falls too fast during charging and discharging, which is an abnormal phenomenon and a manifestation of poor battery performance. When a single battery is charged and discharged at the same time, it rises too fast or drops too fast, and the voltage at the charging end is the highest, and the voltage at the discharging end is the lowest, and it can be judged that the performance of the single battery has decayed or the battery The connection is abnormal (such as loose).

[0019] Therefore, in the BMS system connected to the power battery pack, the SOH value> 95%, 95%≥SOH value> 90%, 90%≥SOH value> 85%, 85%≥SOH value> 80%, 80%≥ SOH value > 75%, 75% ≥ SOH value > 70%, set 6 continuous fault prediction intervals, perform corresponding maintenance at the end ...

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PUM

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Abstract

The invention provides a method for pre-judging a fault battery in a power battery pack. The method includes the steps of: dividing fault pre-judging intervals, recording abnormal data, pre-judging the abnormal battery, restarting abnormal data recording, and circularly performing detection. The method for pre-judging the fault battery in the power battery pack can effectively pre-judge the single battery which may break down by performing real-time monitoring and statistic analysis on the charging and discharging states of the single battery in the power battery pack, timely finds out the single battery with the fault hidden trouble, and improves the usage security of the battery pack in the whole service life period of the battery pack. The method for pre-judging the fault battery in the power battery pack can be directly implemented by a BMS system connected to the battery pack without extra hardware cost.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for predicting faulty batteries of a power battery pack. Background technique [0002] With the widespread promotion of electric vehicles, more and more attention has been paid to the safety of batteries. In the actual use of battery packs, in most cases, the poor performance of one battery affects the entire battery pack. When a battery with poor performance in the group reports a fault, it may happen that the high-voltage power is accidentally cut off during driving or the charging end is reached quickly during the charging process. For example, when an electric vehicle is driving at high speed, a single battery with poor performance may Continuous current discharge, the voltage drop is very fast, the vehicle or BMS system may carry out corresponding fault protection actions, cut off the high voltage relay, make the electric vehicle lose power, and cause serious safety hazards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/396
Inventor 刘飞文锋王占国文灿飞
Owner HUIZHOU EPOWER ELECTRONICS
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