System and method for detecting fault of power battery of vehicle

A technology for fault detection and vehicle power, which is applied to vehicle components, measuring electricity, and electrical devices, etc., can solve problems such as inability to distinguish between battery faults and voltage sensor faults, and achieve the effect of ensuring normal driving and improving work efficiency

Active Publication Date: 2011-04-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that existing detection methods in the prior art cannot distinguish between battery faults and voltage sensor faults, the present invention provides a battery fault detection system capable of distinguishing battery faults from voltage sensor faults and a detection method thereof

Method used

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  • System and method for detecting fault of power battery of vehicle
  • System and method for detecting fault of power battery of vehicle
  • System and method for detecting fault of power battery of vehicle

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no. 1 example

[0034] The more specific steps of the fault detection method of the present invention are as follows: figure 2 Shown, the first embodiment of detection method of the present invention comprises the following steps:

[0035] Step S01, detecting the total voltage of the battery pack and the voltage of the single cells, and summing the voltages of the single cells;

[0036] Step S02, comparing the total voltage V of the battery pack 总 Is it equal to the sum of the voltages of the single cells V 采 ;

[0037] Step S03, when the total voltage V of the single battery 总 Not equal to the sum of the voltages of the single cells V 采 , compare the total voltage of the battery pack V 总 Is it less than the sum of the voltages of the single cells V 采

[0038] Step S04, when the total voltage V of the battery pack 总 Not less than the sum of the voltages of the single cells V 采 When, the total voltage of the battery pack V 总 Greater than the sum of the voltages of the single cells V...

no. 2 example

[0045] Since the battery pack includes n single cells, the number of single cells is a, and the range of a is 1≤a≤n. The battery voltage sensor performs a fault flag, and the voltage detected by this battery will not be used as the basis for subsequent undervoltage alarm calculations. The undervoltage alarm calculation is about comparing the detected voltage of the battery with the standard voltage value. When the battery voltage is lower than the standard value, the battery manager will alarm. Such as image 3 As shown, the second embodiment of the detection method provided by the present invention also includes the following steps:

[0046] Step S051, when it is judged that the voltage sensor is faulty, then compare whether the voltage change of each single battery within a certain period of time T is greater than the set value S, that is, ΔV a Is it greater than the set value S,

[0047] Step S052, when ΔV a When it is greater than the set value S, it is judged that the...

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Abstract

The invention provides a system and a method for detecting the fault of a power battery of a vehicle. The detection system comprises a voltage detection module connected with a power battery pack, and a judgment module connected with the voltage detection module, wherein the voltage detection module is used for detecting the total voltage of the battery pack and the voltages of single batteries and sending the total voltage and the voltages to the judgment module; and the judgment module is used for calculating the received voltage values and comparing calculation results to judge whether thebattery fails or not. By the system and the method for detecting the fault of the battery, a discharge loop of the battery pack cannot be cut off when a voltage sensor fails, so that the normal driving of the whole vehicle is ensured.

Description

technical field [0001] The invention belongs to the field of vehicle battery detection, in particular to a vehicle power battery fault detection system and detection method. Background technique [0002] At present, in a period of increasing energy shortage, electric vehicles and hybrid vehicles are gradually developing as a new energy vehicle. The main energy source of electric vehicles and hybrid vehicles is the power battery pack on the vehicle, so the state (voltage, temperature, etc.) explosion occurs. The existing battery fault detection method is that when the battery manager detects that the voltage of a certain battery or some batteries is zero or very small, it judges that the battery is faulty or abnormal, and the discharge circuit of the control battery is disconnected, and there is no power. Without the battery pack, the whole vehicle will not be able to run. However, when the voltage sensor fails or is disconnected, the battery manager will also detect that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R19/165B60L3/04
Inventor 李淑萍沈晓峰
Owner BYD CO LTD
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