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Battery monitoring apparatus

A battery monitoring and storage battery technology, applied in the direction of battery circuit devices, circuit devices, batteries, etc.

Pending Publication Date: 2021-01-19
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem is especially pronounced when using the techniques described above to monitor the status of a vehicle battery pack comprising multiple batteries

Method used

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  • Battery monitoring apparatus
  • Battery monitoring apparatus
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0040] figure 1 An overall configuration of a power supply system 10 provided in a vehicle (for example, a hybrid vehicle or an electric vehicle) and in which the battery monitoring device 50 according to the first embodiment is used is shown.

[0041] Such as figure 1 As shown, the power supply system 10 includes: an electric motor 20 as a rotating electrical machine; an inverter 30 serving as a power converter for supplying three-phase alternating current to the electric motor 20; a rechargeable battery pack 40; The battery monitoring device 50 which monitors the state; and the ECU 60 which controls the motor 20 and the inverter 30 .

[0042] The electric motor 20 is the main engine of the vehicle. The electric motor 20 is mechanically connected to drive wheels (not shown) of the vehicle such that mechanical power (or torque) is transferred between the electric motor 20 and the drive wheels. In this embodiment, the motor 20 is realized by a three-phase permanent magnet sy...

no. 2 approach

[0119] Figure 6 The configuration of the battery monitoring device 50 configured to perform two-phase lock detection on response signals according to the second embodiment is shown.

[0120] Such as Figure 6As shown, in the present embodiment, the ASIC 50a of the battery monitoring device 50 includes a differential amplifier 151 configured to measure a DC voltage between terminals of the battery cell 42 to be monitored. Specifically, the differential amplifier 151 is connected to the DC voltage input terminal 57 . Furthermore, the differential amplifier 151 is configured to measure a DC voltage input thereto via the DC voltage input terminal 57 and output the measured DC voltage.

[0121] In this embodiment, the ASIC 50a further includes a preamplifier 152 configured to input a voltage change of the battery cell 42 during output of the sine wave signal as a response signal via the response signal input terminal 58 . Specifically, the preamplifier 152 is connected to the r...

no. 3 approach

[0158] Figure 8 The configuration of a battery monitoring device 50 configured to perform FFT (Fast Fourier Transform) in signal analysis according to the third embodiment is shown.

[0159] Such as Figure 8 As shown, in the present embodiment, the ASIC 50a of the battery monitoring device 50 includes a signal processing unit 201 serving as a calculation unit that performs FFT. The signal processing unit 201 is configured to receive the measured value of the DC voltage of the battery unit 42 via the AD converter 154 . Furthermore, the signal processing unit 201 is also configured to receive a response signal via the AD converter 154 . In addition, the signal processing unit 201 is also configured to receive a feedback signal via the AD converter 163 . In addition, the signal processing unit 201 is connected to the oscillation circuit 158, and is configured to be able to set the frequency of the sine wave signal.

[0160] In this embodiment, the signal processing unit 201...

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PUM

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Abstract

A battery monitoring apparatus includes an electric power supply terminal connected with a first electrical path, a voltage input terminal connected with a second electrical path, a signal control unit connected with a third electrical path, a response signal input terminal connected with a fourth electrical path, and a calculating unit. The signal control unit is configured to cause a predetermined AC signal to be outputted from a storage battery with the storage battery itself being an electric power source for the output of the predetermined AC signal. The calculating unit is configured tocalculate, based on a response signal of the storage battery to the predetermined AC signal, a complex impedance of the storage battery. Moreover, at least one of the first to the fourth electrical paths is merged with at least one of the other electrical paths into an electrical path that is connected to the storage battery.

Description

technical field [0001] The present disclosure relates to battery monitoring devices. Background technique [0002] There is known a technology of measuring the complex impedance of the battery to monitor the state of the battery (for example, see Japanese Patent No. JP6226261B2). Specifically, according to this technique, a rectangular wave signal is applied to the battery. Then, based on the response signal of the battery, the complex impedance characteristic of the battery is calculated as a rectangular wave signal. Thereafter, the SOH (ie, state of health) of the battery is determined based on the calculated complex impedance characteristics. [0003] However, when the above-described technique is used in a battery monitoring device to measure the complex impedance of a vehicle battery, the following problems may occur. That is, it is necessary to employ a device such as a power controller to apply a rectangular wave signal to the storage battery. Use of such a device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02P27/06G01R31/364G01R31/382G01R31/389G01R31/392
CPCH02J7/0047H02J7/005H02J7/007194H02J7/0016H02J7/007182H02J7/00714H02P27/06G01R31/389G01R31/382G01R31/392G01R31/364G01R27/02G01R31/396G01R31/3648Y02T10/70H02J7/0063H02J7/1423H01M10/482H01M10/441H01M10/425H01M50/507Y02E60/10H01M2220/20H02J7/0013
Inventor 堀口将且北川昌明
Owner DENSO CORP