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Method And System For Online Estimating Internal Resistance Of Battery

A battery internal resistance and internal resistance technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., can solve the problem of difficult measurement of battery internal resistance

Active Publication Date: 2016-07-13
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system and method for estimating the internal resistance of a battery on-line, which does not require additional devices, is not affected by the environment such as temperature, weather, and road conditions, and is not affected by charging or discharging. It can achieve the estimation of resistance and improve the problem that the internal resistance of existing batteries is difficult to measure

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  • Method And System For Online Estimating Internal Resistance Of Battery
  • Method And System For Online Estimating Internal Resistance Of Battery
  • Method And System For Online Estimating Internal Resistance Of Battery

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Embodiment Construction

[0027] see figure 1 The illustrated embodiment is a system 100 for estimating battery internal resistance online according to the present invention, which includes a high-voltage battery pack 10, a voltage sensing unit 20, a current sensing unit 30, an auxiliary battery 40, and a DC conversion The unit 50 , a driving unit 60 , an on-board charging unit 70 and a control unit 80 .

[0028] The system 100 for estimating battery internal resistance online according to the present invention is suitable for vehicles such as electric vehicles, hybrid vehicles or plug-in hybrid vehicles. The high-voltage battery pack 10 is used to provide a high-voltage power supply to drive the vehicle; the voltage sensing unit 20 is used to sense the total voltage value of the high-voltage battery pack 10; the current sensing unit 30 is used to sense the total current value of the high-voltage battery pack 10; the auxiliary battery 40 is used to To provide a low-voltage power supply for the vehicle...

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Abstract

A method and a system are provided for online estimating internal resistance of battery and are suitable for electric vehicles or hybrid electric vehicles. The system includes: a high-voltage battery pack, a voltage detection unit for detecting the total voltage of the high-voltage battery pack, a current detection unit for detecting the total current of the high-voltage battery pack, a secondary battery for providing low-voltage DC power, a DC / DC conversion unit for conversing the high voltage DC power to a low voltage DC power and transferring the latter to the secondary battery, a drive unit for driving the vehicle, an on-board charging unit for charging high-voltage battery pack, and a control unit. The control unit controls the system to measure information of a constant current and a corresponded voltage difference of the battery pack at the moment the constant current happened before and after, and then to calculate internal resistance of the battery pack.

Description

technical field [0001] The present invention relates to a system and method for estimating the internal resistance of a battery online, in particular to a method that can be used to calculate the battery by controlling and measuring the fixed current information for a specific period of time, and the voltage difference before and after the fixed current occurs. A system and method for online estimation of internal resistance of a battery. Background technique [0002] In the existing methods and strategies for estimating unit cell resistance, it is often necessary to partially unload the load end in order to correctly measure the internal resistance of the battery, especially for power supply equipment composed of many battery packs connected in series. If the internal resistance of the battery is measured without unloading, the detection signal will be shunted through the load end, which will affect the accuracy of the measurement; if the internal resistance of the battery ...

Claims

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Application Information

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IPC IPC(8): G01R27/08
CPCB60L2240/547B60L2240/549B60L58/20G01R31/3842G01R31/389Y02T10/70
Inventor 陈炳仁简士翔
Owner IND TECH RES INST