JP2019124697A - Battery checker - Google Patents

Abstract

To provide a battery checker having a simple configuration, capable of accurately detecting degree of power storage of a battery and preventing overcharge during charging.SOLUTION: A battery checker includes: voltage application means 3 for applying sine wave AC voltage to a battery 2 of a measurement object; ripple voltage measurement means 4 for measuring ripple voltage included in terminal voltage of the battery 2; and power storage degree detection means 5 for detecting power storage degree of the battery 2 by comparing the measured ripple voltage with a setting reference R. The voltage application means 3 is constituted of a transformer 8 for transforming AC of an AC power source 7 such as a commercial AC power source, and an output circuit 9 for applying the transformed AC to the battery 2.SELECTED DRAWING: Figure 1

Description

  The present invention is a battery checker that detects a full charge at the time of charging the battery in various devices equipped with a rechargeable battery such as an electric car, a smartphone, a rechargeable dry battery, a DIY power tool, and a battery checker About.

  Conventionally, for charging the battery, a rectified and smoothed DC power source is used, and the terminal voltage of the battery is confirmed to confirm the state of charge such as full charge of the battery. In addition, battery testers and internal resistance measuring devices that use the AC four-terminal method are commercially available as devices designed for research and experimental use and measuring very small resistance values such as battery internal resistance Patent Document 1).

JP 2004-38029 A Japanese Patent Application Laid-Open No. 10-170615

AC four terminal method battery tester, internal resistance measuring instrument (Tokyo Devices IW7807), Tokyo Devices, http://tokyodevices.jp/categories/battery-testers (Search on June 13, 2014)

In the conventional method of checking the state of charge based on the terminal voltage of the battery, it is difficult to grasp the state of charge correctly, and therefore, there is a problem that overcharging occurs particularly at the time of rapid charging, and the battery life is shortened.
Therefore, the present inventor has considered focusing on a relationship in which the internal resistance of the battery and the degree of charge are in proportion, and detecting the internal resistance to detect the degree of charge. The internal resistance of the battery can be accurately detected by using an internal resistance measuring instrument.
However, the conventional internal resistance measuring instrument is a device for research and experimental use, is expensive, is difficult to use for general use, and the measured value fluctuates due to the fluctuation of the resistance value due to the application of the terminal, etc. And it is difficult for the general public to measure correctly.

  This invention solves the said subject, and it aims at providing the battery checker which can detect the electrical storage grade of a battery precisely, and can perform prevention of the overcharge at the time of charge with easy structure.

  According to the battery checker of the present invention, a voltage application means for applying an alternating voltage to a battery to be measured, a ripple voltage measurement means for measuring a ripple voltage included in a terminal voltage of the battery, and the ripple voltage measurement means And a storage degree detection unit that detects a storage degree of the battery by comparing a ripple voltage with a setting reference. The alternating voltage is a sine wave. The ripple voltage measurement means may be connected between output terminals of the voltage application means connected to the battery.

The battery checker of this configuration focuses on the relation between the internal resistance of the battery and the state of charge, and detects the degree of storage by measuring the internal resistance, so that the internal resistance can be measured accurately and simply. The voltage for measurement was applied in the state of alternating current. When alternating current is applied, a ripple voltage is generated in the battery terminal voltage. The fluctuation range or amplitude of this ripple voltage is proportional to the internal resistance of the battery. Also, the internal resistance of the battery decreases as the charge progresses. Therefore, the fluctuation of the terminal voltage of the battery is measured by the ripple voltage measuring means, and the detected ripple voltage is compared with the setting reference by the electric storage degree detecting means to accurately detect the degree of electric storage of the battery. Can.
The setting reference is, for example, a reference that is appropriately created to determine the degree of storage that can be understood from the relationship between the ripple voltage and the internal resistance, but it is not necessary to indicate the internal resistance as a resistance value. It is good on the basis which shows the relation of. The setting reference may be a curve showing the relationship between the ripple voltage and the degree of charge storage, or may be a value simply indicating a predetermined charge state such as full charge by a constant threshold value of the ripple voltage. .
As described above, since the degree of storage of the battery can be accurately detected, full charge at the time of charge can be accurately detected, overcharging in rapid charging and the like can be avoided, and a reduction in battery life can be prevented. In addition, the above-mentioned accurate storage degree detection can be performed with a simple configuration provided with voltage application means for applying alternating current, ripple voltage measurement means and storage degree detection means with the above configuration.

In the battery checker according to the present invention, the voltage application means includes a transformer for converting the voltage of the AC power supply into a voltage suitable for the voltage of the battery, and an output circuit for applying the AC converted in voltage by the transformer to the battery. You may.
In this configuration, by using a commercial 100 V AC power source for general household use etc. as the AC power source, the voltage applying means has a simple structure including only a transformer and a circuit that outputs the transformed AC. It's over.

In the battery checker according to the present invention, the storage degree detection unit has a plurality of battery type-specific criteria corresponding to the type of the battery to be detected as the setting standard, and a reference switching unit which switches the plurality of battery type-specific criteria. It is good also as composition.
The relationship between the ripple voltage and the internal resistance differs depending on the type of battery, such as a lead battery, a manganese battery, or a lithium ion battery, or the difference in voltage depending on the number of stacked cells in the battery. Therefore, the present invention can be applied to various types of batteries by providing a plurality of battery type criteria and providing the reference switching means. The reference switching means may be switched for each use, or after switching once, one battery type reference may be used as a fixed, and may be used as a battery checker dedicated to a predetermined battery.
In the battery checker of the present invention, the ripple voltage measuring means includes an amplifier, a capacitor and a voltmeter, and the amplifier amplifies a voltage between terminals of two differential inputs, and the positive side of the battery is The output terminal may be connected to the positive input terminal of the amplifier via the capacitor, and the negative output terminal of the battery may be directly connected to the negative input terminal of the amplifier.

  According to the battery checker of the present invention, voltage application means for applying an alternating voltage to a battery to be measured, ripple voltage measurement means for measuring ripple voltage included in the terminal voltage of the battery, and the ripple voltage measurement means The AC voltage is a sine wave so that the AC voltage is a sine wave, so that the AC voltage of the battery can be accurately detected, and the battery is charged Overcharging can be prevented with a simple configuration.

It is an explanatory view showing the circuit composition of the battery checker concerning one embodiment of this invention by an electric circuit and a block.

An embodiment of the present invention will be described with reference to the drawings. The battery checker 1 comprises a voltage applying means 3 for applying an alternating voltage to the battery 2 to be measured, a ripple voltage measuring means 4 for measuring a ripple voltage included in the terminal voltage of the battery 2, and the ripple voltage measuring means And a storage degree detection means for detecting the storage degree of the battery by comparing the ripple voltage measured at 4 with a setting reference R. In addition to this, a storage degree notification means 6 for notifying the storage degree detected by the storage degree detection means 5 is provided. The battery 2 is installed in the battery-equipped device 15, but may be in a single state. The battery-equipped device 15 may be, for example, any device provided with a rechargeable battery 2, such as an electric car, a smartphone, a personal computer, a DIY power tool, a charging socket for a rechargeable dry battery, or the like.

The voltage application means 3 comprises a transformer 8 for converting the voltage of the AC power supply 7 into a voltage suitable for checking the voltage of the battery 2, and an output circuit 9 for applying to the battery the AC voltage-converted by the transformer 8 Ru. Although the voltage suitable for the voltage check of the battery 2 varies depending on the capacity of the battery 2, for example, with respect to the voltage when the battery 2 is fully charged,
It is a voltage of about several V (2 to 3 V) or higher. The AC power supply 7 is, for example, a 100 V or 200 V single-phase AC commercial power supply, and an input terminal 10 such as a plug inserted into an outlet (not shown) in the wiring of the AC power supply 7 is provided upstream of the transformer 8 ing.

  The output circuit 9 may be configured to output the alternating current transformed by the transformer 8 to the output terminal 11 for applying the battery 2 or the battery-equipped device 15, but in the illustrated example, the output terminals 11 and 11 and the transformer 8 A resistor 12 for current restriction and a capacitor 16 for blocking the DC voltage of the battery 2 are provided between the secondary coil and the secondary coil. The current limiting resistor 12 can be replaced by one having a different resistance value in order to determine the ripple current value according to the battery 2.

The ripple voltage measuring means 4 is composed of an amplifier 17 composed of an operational amplifier or the like, a capacitor 13 and a voltmeter 4a. The amplifier 17 is an amplifier that amplifies a voltage between terminals of two differential inputs, and the positive output terminal 11 of the battery 2 is connected to the positive input terminal of the amplifier 17 via the capacitor 13, The negative output terminal 11 of 2 is directly connected to the negative input terminal of the amplifier 17. With the interposition of the capacitor 13, the DC voltage of the battery 2 is not applied to the amplifier 17, and only the ripple voltage of the battery 2 is applied to the amplifier 17. The amplified ripple voltage is measured by the voltmeter 4a.
The voltage between the output terminals 11 and 11 of the battery 2 is measured by another voltmeter 18 connected therebetween.

  The storage degree detection means 5 has a plurality of battery type reference Ras corresponding to each type of the battery 2 to be measured as the setting reference R, and a reference switching means 14 for switching the plurality of battery type references Ra. . The storage degree detection means 5 comprises an electronic circuit including a storage element storing the setting reference R, a microcomputer or the like. The reference switching means 14 is composed of, for example, an operator operated by an operator, a circuit for switching the battery type reference Ra according to the operation, a program or the like (none of which is shown).

  The setting reference R is a reference that is appropriately created to indicate the degree of storage that can be understood from the relationship between the ripple voltage and the internal resistance, but the relationship between the ripple voltage and the degree of storage without particularly indicating the internal resistance as a resistance value. It may be a standard that directly indicates Further, the setting reference R may be a curve showing the relationship between the ripple voltage and the degree of charge storage, or may be a value indicating the full charge simply by a constant threshold value of the ripple voltage.

The plurality of battery type criteria Ra in the setting criteria R correspond to, for example, the type of battery such as a lead battery, manganese battery, lithium ion battery, or the difference in voltage depending on the number of stacked cells in the battery 2 or both. Is set. The reference switching means 14 may be switched for each use, or may be used as a battery checker dedicated to a predetermined battery by using one battery type reference as a fixed after switching once.

  The storage degree informing means 6 is means for transmitting information indicating the degree of storage detected by the storage degree detection means 5 to a person or a device, and an image display device of a liquid crystal screen showing the degree of storage in an image such as a bar graph It consists of one or several lamps etc. which switch lighting number, lighting, blink etc. according to the grade of electrical storage. The storage degree notification means 6 may have a function to stop charging by the charging device (not shown) when the storage degree is fully charged.

According to the battery checker 1 of this configuration, in order to apply an alternating current to the battery 2, a ripple voltage is generated in the terminal voltage of the battery 2. That is, when the alternating current a in FIG. 1 is applied to the battery 2, a ripple voltage b whose waveform is shown in FIG. 1 is generated. The applied alternating current a is a sine wave. The fluctuation range of the ripple voltage, that is, the amplitude is proportional to the internal resistance r of the battery 2. Further, the internal resistance R of the battery 2 becomes smaller as the charging progresses. Therefore, as the charging progresses, the ripple voltage b decreases as indicated by a waveform indicated by a symbol "b '".
Therefore, by measuring the fluctuation range of the terminal voltage of the battery 2 by the ripple voltage measuring means 4 and comparing the detected ripple voltage with the setting reference by the electric storage degree detecting means 5, the degree of electric storage of the battery 2 is accurate Can be detected.

  As described above, since the degree of storage of the battery 2 can be accurately detected, full charging at the time of charging can be accurately detected, overcharging in rapid charging and the like can be avoided, and life reduction of the battery 2 can be prevented. it can. In addition, the above-mentioned accurate storage degree detection can be performed with a simple configuration provided with the voltage application means 3 for applying alternating current, the ripple voltage measurement means 4 and the storage degree detection means 5 of the above configuration.

  In this example, the voltage application means 3 includes the transformer 8 for transforming the voltage of the AC power supply 7 and the output circuit 9 for applying the voltage transformed by the transformer 8 to the battery 2. It is possible to use a commercial power supply of 100 V AC for general household use. Therefore, the voltage application means 3 can be configured simply.

  The storage degree detection unit 5 includes a plurality of battery type reference Ras according to the type of the battery 2 to be detected and the reference switching unit 14, and therefore, can be applied to various batteries 2.

DESCRIPTION OF SYMBOLS 1 ... Battery checker 2 ... Battery 3 ... Voltage application means 4 ... Ripple voltage measurement means 4a ... Voltmeter 5 ... Accumulation degree detection means 6 ... Accumulation degree alerting means 7 ... AC power supply 8 ... Transformer 9 ... Output circuit 15 ... Battery equipment apparatus R ... Setting criteria Ra ... Battery type criteria

Claims (5)

Voltage application means for applying AC voltage to the battery to be measured, ripple voltage measurement means for measuring ripple voltage included in the terminal voltage of the battery, and ripple voltage measured by this ripple voltage measurement means are compared with the setting reference And storage means for detecting the storage degree of the battery.
The battery checker whose said alternating voltage is a sine wave.   The battery checker according to claim 1, wherein the ripple voltage measuring means comprises an amplifier, a capacitor and a voltmeter, the amplifier amplifies a voltage between terminals of two differential inputs, and The positive output terminal is connected to the positive input terminal of the amplifier via the capacitor, the negative output terminal of the battery is directly connected to the negative input terminal of the amplifier, and the setting reference is , Battery Checker, which is a standard that has been created to determine the degree of storage.   The battery checker according to claim 1 or 2, wherein the storage degree detection unit uses a plurality of battery type criteria corresponding to the type of the battery to be measured as the setting reference, and a plurality of battery type criteria. A battery checker having reference switching means for switching.   The battery checker according to any one of claims 1 to 3, wherein the voltage application means includes a transformer for converting a voltage of an AC power supply into a voltage suitable for the voltage of the battery, and a voltage converted by the transformer. A battery checker comprising an output circuit for applying an alternating current to the battery. The battery checker according to any one of claims 1 to 4.
The ripple voltage measuring means is a ripple voltage measuring means for measuring a ripple voltage periodically fluctuating superimposed on a direct current component, which is included in the terminal voltage of the battery, and storing electricity by measuring the internal resistance of the battery. Battery checker to detect the degree.

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