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Equalizer

A technology of equalization and secondary batteries, which is applied in the direction of measuring devices, circuit devices, battery circuit devices, etc., can solve problems such as inability to equalize, and achieve the effect of improving accuracy

Active Publication Date: 2022-04-19
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the conventional equalization device described above has a disadvantage that since the detection accuracy of the voltage detection section is only about ± several mV, equalization cannot be performed with higher accuracy than that.

Method used

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Embodiment Construction

[0027] The following will refer to figure 1 A battery monitoring device according to the first embodiment is explained. The battery monitoring device 1 of this embodiment is configured, for example, to be mounted on an electric vehicle, and configured to monitor the cells Ce1-Ce3 as a plurality of secondary batteries constituting figure 1 Shown is a battery pack 2 mounted on an electric vehicle. The cells Ce1-Ce3 are connected to each other in series.

[0028] The battery monitoring device 1 performs the following three controls. First, the battery monitoring device 1 performs control in which it detects the internal resistance of the individual cells Ce1-Ce3 to detect the state of the cells Ce1-Ce3. Furthermore, the battery monitoring device 1 performs its control to equalize the end-to-end voltages of the cells Ce1-Ce3 ("end-to-end voltage" means the voltage between both ends of the cells). In addition, the battery monitoring device 1 performs control such that it detect...

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PUM

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Abstract

An equalization device with improved accuracy is provided. The differential amplifier circuit (16) is used for inputting end-to-end voltages of two single cells among the plurality of single cells (Ce1‑Ce3), and for outputting a difference between the input two end-to-end voltages. The switching unit (SW1) and the switching unit (12) are provided between the differential amplifier circuit (16) and the plurality of cells (Ce1-Ce3). The μCOM (19) controls the switching section (SW1) and the switching unit (12) to switch the combination of the two cells (Ce1-Ce3) to be input to the differential amplifier circuit (16). The μCOM (19) determines the difference between the plurality of cells (Ce1-Ce3) based on the combination of the two cells (Ce1-Ce3) input to the differential amplifier circuit (16) and the differential voltage (Vm) of the differential amplifier circuit (16). Which of the cells has the highest end-to-end voltage, and the equalization of the cells (Ce1-Ce3) is performed by reducing the end-to-end voltage of the cell with the highest end-to-end voltage.

Description

[0001] Cross References to Related Applications [0002] This application is based on the prior Japanese Patent Application No. 2017-199072, which is incorporated herein by reference. technical field [0003] The invention relates to an equalization device. Background technique [0004] Electric vehicles (EV), plug-in hybrid vehicles (PHEV), and hybrid vehicles (HEV) are equipped with high-voltage batteries for driving electric motors. A high-voltage battery includes several tens to hundreds of secondary batteries (hereinafter referred to as "single cells") connected in series to obtain a high voltage of, for example, several hundreds of volts. A difference in the state of charge (hereinafter referred to as "SOC") occurs between cells due to variations in battery capacity that occur at the time of production, due to leakage current, and due to deterioration of the cells. [0005] For example, once the SOC of one cell reaches 100% during charging, the remaining cells cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00G01R31/396
CPCH02J7/0016
Inventor 庄田隆博
Owner YAZAKI CORP