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Earth leakage detecting device and earth leakage detecting method

A technology of leakage detection and voltage detector, which can be used in power consumption devices, measuring devices, circuit devices, etc., can solve problems such as the inability to ensure the insulation of high-voltage battery packs

Inactive Publication Date: 2019-03-01
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is conceivable that the insulation of the high-voltage battery pack cannot be ensured due to vehicle failure, etc.

Method used

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  • Earth leakage detecting device and earth leakage detecting method
  • Earth leakage detecting device and earth leakage detecting method
  • Earth leakage detecting device and earth leakage detecting method

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Embodiment Construction

[0018] Hereinafter, the electric leakage detection device and the electric leakage detection method of the first embodiment will be described with reference to the drawings.

[0019] figure 1 It is a diagram schematically showing a configuration example of a battery pack equipped with the leakage detection device according to the first embodiment.

[0020] The battery pack (battery pack) 10 on which the leakage detection device according to the present embodiment is mounted is mounted, for example, in a hybrid vehicle as a battery pack. The hybrid vehicle includes a battery pack 10 , a vehicle ECU 30 , and a 12V lead battery 40 . The battery pack 10 includes a first battery bank (bank) bk1, a second battery bank bk2, a battery control unit (BCU: battery control unit) 12, an insulation resistance drop detector 16, terminal blocks 18P, 18N, a current sensor CS, a pre-charger Resistor PCR, precharge switch SWP, main circuit switch SWG, SWB, connector CN, main circuit positive t...

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PUM

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Abstract

An earth leakage detecting method according to a mode of embodiment of the present invention provides an earth leakage detecting device and an earth leakage detecting method which accurately detect earth leakage. The earth leakage detecting method includes: closing one of a first switch SW1 and a second switch SW2 and opening the other of the first switch SW1 and the second switch SW2, and in thisstate making a plurality of measurements of a set comprising a first voltage VL1, which is the voltage between the two ends of a second resistor R2, and a total voltage Vb1, and recording the same ina memory; opening one of the first switch SW1 and the second switch SW2 and closing the other of the first switch SW1 and the second switch SW2, and in this state using a voltage detector VS to measure at least one second voltage VL2, which is the voltage between the two ends of the second resistor R2, corresponding to a total voltage Vb2, of which the difference compared with any of the plurality of total voltages Vb1 recorded in the memory is at most equal to a voltage threshold; using the total voltage Vb, the first voltage VL1 and the second voltage VL2 to calculate a total insulation resistance RL between a battery pack 10 and earth; and determining that earth leakage is occurring if the value of the total insulation resistance RL is at most equal to an earth leakage threshold.

Description

technical field [0001] Embodiments of the present invention relate to a leakage detection device and a leakage detection method. Background technique [0002] For example, a battery pack (battery pack) is mounted on a vehicle such as an electric car or a hybrid car as a driving power source. If the high-voltage battery pack used in the vehicle is connected to the human body, electric shock will occur due to the flow of current from the high-voltage battery pack to the human body. Therefore, the high-voltage battery pack is electrically separated from the chassis ground of the vehicle to ensure the safety of the human body. . [0003] However, it is conceivable that the insulation of the high-voltage battery pack cannot be ensured due to a breakdown of the vehicle or the like. Therefore, in order to ensure the safety of the human body more reliably, it is desirable to be able to detect the leakage of the high-voltage battery pack and the ground wire of the chassis. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/36G01R31/396H01M10/48H02H3/00H02J7/00
CPCH01M10/48H02H3/00H02J7/00G01R27/18G01R27/025G01R31/52Y02E60/10G01R31/36G01R31/389B60K6/28B60L3/0046B60Y2200/92B60Y2400/308
Inventor 村上学大泽岳史山内信之小畑吉盛
Owner KK TOSHIBA