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Method and apparatus for detecting internal electric state of in-vehicle secondary battery

A battery and charging device technology, applied in battery circuit devices, measuring devices, circuit devices, etc., can solve problems such as inaccurate estimation

Active Publication Date: 2009-06-03
NIPPON SOKEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Estimates of charge capacity and the time necessary for charging are more inaccurate

Method used

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  • Method and apparatus for detecting internal electric state of in-vehicle secondary battery
  • Method and apparatus for detecting internal electric state of in-vehicle secondary battery
  • Method and apparatus for detecting internal electric state of in-vehicle secondary battery

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no. 1 example

[0025] Reference attached Figure 1-5 , the first embodiment of the present invention will now be described. In this embodiment, the detection device according to the invention is implemented as an SOC (state of charge) calculation device for an in-vehicle battery.

[0026] attached figure 1 A block diagram of the SOC calculation device 1 is shown.

[0027] The SOC computing device 1 is installed in a vehicle, and the device 1 is electrically connected to a storage device in the vehicle (referred to here as a battery (rechargeable or accumulator)), an in-vehicle generator 102 (vehicle) driven by a vehicle engine (not shown) internal AC generator, that is, an alternator), and an electrical load 103 installed in the vehicle. The generator 102 is made as a field coil type generator. The electrical load 103 is powered by the battery 101 .

[0028] The battery 101 is a storage battery composed of a lead-acid battery, a nickel-metal hydride battery or a lithium battery. Any ty...

no. 2 example

[0070] Reference attached Figure 6-8 , a second embodiment of the detection device according to the invention will now be described.

[0071] As in the first embodiment, in the second embodiment, the detection means is realized as the SOC calculation means for the in-vehicle battery. In addition, for simplicity of description, elements similar or identical to those of the SOC computing device in the first embodiment still use the same reference numerals.

[0072] In addition to processor 107 based on the attached Figure 6 In addition to the flow chart shown in the work, the hardware structure of the SOC computing device and the attached figure 1 The device 1 described is the same. In addition, steps S11-S16 are the same as steps S1-S6. Among these steps, if the determination is YES in step S15, the processor 107 assumes that the polarization has completely disappeared, and proceeds to step S16. As in the aforementioned first embodiment, in this step, the processor 107 r...

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PUM

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Abstract

The invention relates to an apparatus and a method for detecting internal electric state of in-vehicle secondary battery. In a proposed apparatus and method, constant-voltage charge is performed with an in-vehicle secondary battery immediately after start of a vehicle or during running of the vehicle. A quantity relevant to polarization caused in the battery immediately after start of the constant-voltage charge is calculated using data of the charge current. It is determined whether or not a change rate of the calculated polarization-relevant quantity is less than a given threshold. When the change rate is less than the given threshold, a plurality of data of the charge current sampled and held during a predetermined period of time are acquired. A value of the charge current to be accumulated until the charge current reaches a given final value is calculated using the plurality of data of the charge current. The internal electric state of the battery is estimated based on the accumulated value of the charge current.

Description

technical field [0001] The invention relates to a device and method for detecting the internal electrical state of a storage battery in a vehicle. Background technique [0002] In recent years, the capacity of storage batteries (rechargeable batteries) installed in vehicles has been increasing to meet the increase in the number of electrical loads installed in vehicles. Therefore, in recent years, it has become very important to prevent overcharging and overdischarging of the battery in the vehicle. It is therefore necessary to detect reliable and accurate information representing the internal electrical state of the battery, including information on the remaining charge capacity of the battery. [0003] Under such circumstances, Japanese Patent Application No. 3249788 discloses a conventional method of estimating information representing the internal electrical state of an in-vehicle battery. The estimation method proposed in this publication uses the discharge current ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/14G01R31/36
CPCY02E60/12Y02T10/7005Y02E60/10
Inventor 水野觉小野博明外村征幸
Owner NIPPON SOKEN
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