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Power battery insulation resistance online monitoring device and method

An insulation resistance, power battery technology, applied in the field of electric vehicles, to achieve the effect of improving algorithm design, reducing requirements, and enhancing electromagnetic environment adaptability

Pending Publication Date: 2019-03-15
常州是为电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The invention provides a device and method for on-line monitoring of power battery insulation impedance, aiming to solve the defects existing in existing detection methods

Method used

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  • Power battery insulation resistance online monitoring device and method
  • Power battery insulation resistance online monitoring device and method
  • Power battery insulation resistance online monitoring device and method

Examples

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Embodiment Construction

[0040] According to one or more embodiments, such as image 3 As shown, the power battery insulation resistance online monitoring device includes a controller unit, a signal conversion module, a relay switch module, and a signal amplification module.

[0041] The controller unit is used to generate PWM input signals, control relay switch state switching, collect insulation resistance detection circuit output signals, perform mathematical operations, and report the calculated insulation resistance value to the vehicle control unit through CAN bus communication. The signal conversion module is used to convert the PWM signal output by the controller unit into a sinusoidal signal with a fixed frequency. The signal amplifying module is used to adjust the detected signal to the detectable range of the controller unit to improve the sampling resolution. The relay switch module is used to switch the connection state between the monitored high-voltage circuit and the low-voltage detec...

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Abstract

The invention discloses a power battery insulation resistance online monitoring device. The monitoring device comprises a controller unit, a signal conversion module, a relay switching module and a signal amplifying module; the signal conversion module is accessed into one output end of the controller unit, the relay switching module is accessed into the other output end of the controller unit, the relay switching module and the signal amplifying module are accessed into the output end of the signal conversion module separately, the controller unit is accessed into the output end of the signalamplifying module and generates a PWM signal, and the signal conversion module converts the PWM signal output by the controller unit into a sinusoidal signal with fixed frequency; the controller unitcontrols switching of the relay switching module; the sinusoidal signal is injected into a power battery output circuit after passing through the relay switching module; the signal amplifying moduleadjusts an obtained insulation resistance detection signal to be within a detectable range of the controller unit; the controller unit conducts calculating to obtain a power battery insulation resistance value through the collected insulation resistance detection signal.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to an on-line monitoring device and method for the insulation resistance of a power battery. Background technique [0002] With the continuous development of new energy technology, the use of electric vehicles has become more and more common. Different from traditional cars that use fuel as their power source, electric vehicles use battery pack energy storage systems as their power source. In order to increase the cruising range of electric vehicles as much as possible, the battery pack energy storage system usually has the characteristics of high voltage and high current. [0003] Under ideal conditions of normal use of electric vehicles, the battery pack energy storage system and its high-voltage electrical circuit are a completely closed system, which is completely insulated from the shell and chassis of the electric vehicle. However, during the long-term ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R27/02B60L58/12
CPCG01R27/025Y02T10/70
Inventor 阳威杨锡旺
Owner 常州是为电子有限公司
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