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Battery voltage detector

A battery voltage detection and voltage detection circuit technology, applied in battery circuit devices, battery/fuel cell control devices, measurement devices, etc., can solve problems such as low cell voltage and decreased cell balance control accuracy, and achieve the effect of a simple structure

Inactive Publication Date: 2012-10-17
KEIHIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This flying capacitor type voltage detection circuit has the following disadvantages: when the leakage current of the flying capacitor or the sampling switch increases due to aging of the circuit, the detected cell voltage of the measuring object is lower than the actual value
As a result, there is a concern that the accuracy of cell balance control may decrease due to the inability to obtain accurate cell voltages.

Method used

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Embodiment Construction

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] figure 1 It is a schematic configuration diagram of the battery voltage detection device 1 in this embodiment. as it should figure 1 As shown, the battery voltage detection device 1 is equipped with a function of detecting the cell voltages of the 12 battery cells C1 to C12 constituting the storage battery and a function of performing cell balance control (balancing of the cell voltages) of each of the battery cells C1 to C12. ECU (Electronic Control Unit) includes 12 bypass circuits B1~B12, 12 unit voltage detection circuits D1~D12, microcomputer M (voltage processing part), and insulating element IR.

[0018] Each of the bypass circuits B1 to B12 is composed of a series circuit of a bypass resistor and a switching element such as a transistor. The bypass circuits B1 to B12 are connected in parallel to the battery cells C1 to C12, respectively. In addition...

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PUM

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Abstract

A battery voltage detector includes a voltage detection circuit and a voltage processor. The voltage detection circuit detects a cell voltage of a first battery cell. The voltage detection circuit includes a plurality of capacitors which are simultaneously charged by the first battery cell. The voltage processor processes the detection result of the first cell voltage. The voltage detection circuit outputs the voltages between both terminals of the plurality of capacitors as the cell voltages to the voltage processor at different timing. The voltage processor judges whether or not a false detection of the cell voltage occurs based on the cell voltages obtained from the voltage detection circuit at different timing.

Description

technical field [0001] The invention relates to a battery voltage detection device. Background technique [0002] As is well known, vehicles such as electric vehicles and hybrid vehicles are equipped with an electric motor as a power source and a high-voltage / large-capacity battery for supplying electric power to the electric motor. This storage battery is constituted by connecting a plurality of battery cells (cells) composed of lithium-ion batteries, nickel-hydrogen batteries, or the like in series. Conventionally, in order to maintain the performance of the storage battery, cell balancing control is performed to balance the cell voltages of the individual cells by monitoring the cell voltages of the individual cells. [0003] In the detection of cell voltage, the use of a dedicated isolated power supply or a flying capacitor voltage detection circuit that does not require insulating components has become the mainstream. This flying capacitor type voltage detection circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/36G01R19/165H02J7/00H02J7/02
CPCG01R31/3658G01R31/362B60L58/18B60L2240/547G01R31/3835G01R31/396H02J7/0016Y02T10/70
Inventor 槌矢真吾镰田诚二
Owner KEIHIN CORP