JP6865780B2 - Battery checker - Google Patents

Description

The present invention is a battery checker that detects the full charge of the battery in various devices including a rechargeable battery such as an electric vehicle, a smartphone, a rechargeable dry battery, and a DIY power tool, and the degree of storage of the remaining battery power. Regarding.

Conventionally, a rectified and smoothed DC power supply is used to charge the battery, and the state of charge such as full charge of the battery is confirmed by checking the terminal voltage of the battery. As a device designed for research / experimental use and measuring a very small resistance value such as the internal resistance of a battery, a battery tester / internal resistance measuring instrument using the AC 4-terminal method is commercially available (non-existent). Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-38029 Japanese Unexamined Patent Publication No. 10-170615

AC 4-terminal method battery tester / internal resistance measuring instrument (Tokyo Devices IW7807), Tokyo Devices, http://tokyodevices.jp/categories/battery-testers (searched on June 13, 2014)

It is difficult to grasp the accurate charge state by the conventional method of confirming the charge state by the terminal voltage of the battery, and therefore, there is a problem that overcharge occurs especially at the time of quick charging and the life of the battery is shortened.
Therefore, the present inventor has focused on the relationship in which the internal resistance of the battery is proportional to the degree of charge, and considered detecting the internal resistance to detect the degree of charge. The internal resistance of the battery can be detected accurately by using an internal resistance measuring instrument.
However, the conventional internal resistance measuring instrument is a device for research / experimental use, is expensive, difficult to use for general use, and the measured value fluctuates due to fluctuations in resistance value depending on how the terminals are applied. However, it is difficult for the general public to measure accurately.

An object of the present invention is to solve the above-mentioned problems, and to provide a battery checker capable of accurately detecting the storage level of a battery and preventing overcharging during charging with a simple configuration.

The battery checker of the present invention was measured by a voltage applying means for applying an AC voltage to the battery to be measured, a ripple voltage measuring means for measuring the ripple voltage included in the terminal voltage of the battery, and the ripple voltage measuring means. It is provided with a storage degree detecting means for detecting the storage degree of the battery by comparing the ripple voltage with the setting reference. In the voltage applying means, an AC voltage is supplied from an AC commercial power source and applied to the battery to be measured, and the applied AC voltage is a sine wave. The ripple voltage measuring means may be connected between output terminals connected to the battery of the voltage applying means.

The battery checker with this configuration focuses on the relationship between the internal resistance of the battery and the state of charge, and detects the degree of electricity storage by measuring the internal resistance so that the internal resistance can be measured accurately and easily. , The voltage for measurement was applied in the AC state. When alternating current is applied, a ripple voltage is generated in the terminal voltage of the battery. The fluctuation range of this ripple voltage, that is, the amplitude, is proportional to the internal resistance of the battery. Also, the internal resistance of the battery decreases as charging progresses. Therefore, the fluctuation range 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 storage degree detecting means to accurately detect the storage degree of the battery. Can be done.
The setting standard is, for example, a standard that is appropriately created to determine the degree of storage that can be determined from the relationship between the ripple voltage and the internal resistance. However, the ripple voltage and the degree of storage are not particularly indicated as the internal resistance. A standard that directly shows the relationship between Further, the setting reference may be a curve showing the relationship between the ripple voltage and the degree of electricity storage, or a value indicating a predetermined storage state such as a full charge with a certain threshold value of the ripple voltage. ..
Since the degree of charge of the battery can be accurately detected in this way, it is possible to accurately detect the full charge at the time of charging, avoid overcharging during quick charging and the like, and prevent the battery life from being shortened. Further, it is possible to detect the above-mentioned accurate storage degree with a simple configuration provided only by providing a voltage applying means for applying alternating current, a ripple voltage measuring means having the above-mentioned configuration, and a storage degree detecting means.

In battery checker of the present invention, the voltage applying means includes a transformer that converts the voltage of the AC commercial power source into a voltage suitable for a voltage of the battery, and an output circuit for applying a voltage converted AC in the transformer to the battery It may be composed of.
In the case of this configuration, by using an AC 100V commercial power supply for general household use as the AC power supply, the voltage applying means has a simple configuration of a transformer and a circuit that simply outputs the transformed AC. I'm done.

In the battery checker of the present invention, the storage degree detecting means has, as the setting standard, a plurality of battery type-specific standards according to the type of the battery to be detected, and a reference switching means for switching the plurality of battery type-specific standards. It may be configured.
The relationship between the ripple voltage and the internal resistance differs depending on the type of battery such as a lead battery, manganese battery, lithium ion battery, or the difference in voltage due to the number of stacked cells in the battery. Therefore, it can be applied to various batteries by providing a plurality of battery type-specific standards and providing the standard switching means. The reference switching means may be switched each time it is used, or after switching once, one battery type reference may be used as a fixed battery and 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 the voltage between the terminals of the two differential inputs to the positive side of the battery. 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.

The battery checker of the present invention is measured by a voltage applying means for applying an AC voltage to the battery to be measured, a ripple voltage measuring means for measuring the ripple voltage included in the terminal voltage of the battery, and the ripple voltage measuring means. It is provided with a storage degree detecting means for detecting the storage degree of the battery by comparing the ripple voltage with a setting reference, and the voltage applying means is supplied with an AC voltage from an AC commercial power source and applied to the battery to be measured. since this is the AC voltage is positive sine wave which is applied to, the degree of energy storage battery can accurately detect and prevent overcharging of the charging performed with a simple structure.

It is explanatory drawing which shows the circuit structure of the battery checker which concerns on 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 includes a voltage applying means 3 that applies an AC voltage to the battery 2 to be measured, a ripple voltage measuring means 4 that measures a ripple voltage included in the terminal voltage of the battery 2, and the ripple voltage measuring means. It is provided with a storage degree detecting means 5 for detecting the storage degree of the battery 2 by comparing the ripple voltage measured in 4 with the setting reference R. In addition to this, a storage degree notification means 6 for notifying the storage degree detected by the storage degree detecting means 5 is provided. Although the battery 2 is installed in the battery-equipped device 15, it may be in a single state. The battery-equipped device 15 may be any device provided with a rechargeable battery 2, for example, an electric vehicle, a smartphone, a personal computer, a DIY electric tool, a socket for charging a rechargeable dry battery, or the like.

The voltage applying means 3 includes a transformer 8 that converts 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 that applies the AC voltage converted by the transformer 8 to the battery. To. The voltage suitable for checking the voltage of the battery 2 differs depending on the capacity of the battery 2, but for example, with respect to the voltage when the battery 2 is fully charged.
The voltage is as high as several V (2 to 3 V) or more. The AC power supply 7 is, for example, a 100V or 200V single-phase AC commercial power supply, and an input terminal 10 such as a plug to be inserted into an outlet (not shown) in the wiring of the AC power supply 7 is provided on the upstream side 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 that applies the alternating current transformed by the transformer 8 to the battery 2 or the battery-equipped device 15, but in the illustrated example, the output terminals 11 and 11 and the transformer 8 may be used. A resistor 12 for limiting current and a capacitor 16 for passing the DC voltage of the battery 2 are provided between the secondary coil and the second coil. The current limiting resistor 12 can be replaced with a resistor having a different resistance value in order to determine the ripple current value according to the battery 2.

The ripple voltage measuring means 4 includes an amplifier 17 including an operational amplifier, a capacitor 13, and a voltmeter 4a. The amplifier 17 is an amplifier that amplifies the voltage between the terminals of the two differential inputs, and the output terminal 11 on the positive side of the battery 2 is connected to the input terminal on the positive side of the amplifier 17 via the capacitor 13, and the battery The negative output terminal 11 of 2 is directly connected to the negative input terminal of the amplifier 17. By interposing 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 a voltmeter 4a.
The voltage between the output terminals 11 and 11 of the battery 2 is measured by another voltmeter 18 connected between them.

The storage degree detecting means 5 includes a plurality of battery type-specific 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-specific reference Ras. .. The electricity storage degree detecting means 5 includes an electronic circuit, a microprocessor, or the like including a storage element that stores the setting reference R. The reference switching means 14 includes, for example, an operator operated by an operator and a circuit or program (neither shown) for switching the reference Ra for each battery type according to the operation.

The setting reference R is a standard appropriately created to indicate the degree of storage that can be seen from the relationship between the ripple voltage and the internal resistance, but the relationship between the ripple voltage and the degree of storage is not particularly shown as 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 electricity storage, or may be a value indicating simply full charge with a certain threshold value of the ripple voltage.

The plurality of battery type-specific criteria Ra in the setting reference R depend on, for example, the type of battery such as a lead battery, manganese battery, or lithium-ion battery, the difference in voltage due to the number of stacked cells in the battery 2, or both. Is set. The reference switching means 14 may be switched each time it is used, or after switching once, one battery type reference may be used as a fixed battery and used as a battery checker dedicated to a predetermined battery.

The electricity storage degree notification means 6 is a means for transmitting information indicating the electricity storage degree detected by the electricity storage degree detecting means 5 to a person or a device, and is an image display device of a liquid crystal screen showing the electricity storage degree as an image such as a bar graph, or. It consists of one or more lamps that switch the number of lights, lighting, blinking, etc. depending on the degree of electricity storage. The electricity storage degree notification means 6 may have a function of stopping charging by a charging device (not shown) when the electricity storage degree is fully charged.

According to the battery checker 1 having this configuration, since alternating current is applied 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 showing a waveform in the figure is generated. The alternating current a to be applied 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 charging progresses. Therefore, as the charging progresses, the ripple voltage b becomes smaller as shown by the waveform indicated by the reference numeral “b ′”.
Therefore, the fluctuation range of the terminal voltage of the battery 2 is measured by the ripple voltage measuring means 4, and the detected ripple voltage is compared with the setting reference by the storage degree detecting means 5, so that the degree of storage of the battery 2 is accurate. Can be detected.

Since the degree of storage of the battery 2 can be accurately detected in this way, it is possible to accurately detect the full charge at the time of charging, avoid overcharging during quick charging, and prevent the life of the battery 2 from being shortened. it can. Further, the above-mentioned accurate storage degree can be detected by a simple configuration in which the voltage applying means 3 for applying alternating current, the ripple voltage measuring means 4 and the storage degree detecting means 5 having the above-described configuration are provided.

In this example, the voltage applying means 3 includes a transformer 8 that transforms the voltage of the AC power supply 7, and an output circuit 9 that applies the voltage transformed by the transformer 8 to the battery 2. Therefore, the AC power supply 7 As a result, a commercial power source of AC 100V for general household use or the like can be used. Therefore, the voltage applying means 3 can be simply configured.

Since the storage degree detecting means 5 has a plurality of battery type-specific reference Ras according to the type of the battery 2 to be detected and the reference switching means 14 thereof, it can be applied to various batteries 2.

1 ... Battery checker 2 ... Battery 3 ... Voltage applying means 4 ... Ripple voltage measuring means 4a ... Voltmeter 5 ... Charging degree detecting means 6 ... Charging degree notifying means 7 ... AC power supply 8 ... Transformer 9 ... Output circuit 15 ... Battery equipped equipment R ... Setting standard Ra ... Battery type standard

Claims (4)

A voltage applying means for applying an AC voltage to the battery to be measured, a ripple voltage measuring means for measuring the ripple voltage included in the terminal voltage of the battery, and a ripple voltage measured by the ripple voltage measuring means are compared with a setting reference. The battery is provided with a storage degree detecting means for detecting the storage degree of the battery.
Said voltage applying means, is supplied with an AC voltage from an AC commercial power supply is applied to the measurement target battery, Ri said AC voltage to the applied sinusoidal der,
The voltage applying means includes a transformer that converts the voltage of the AC commercial power supply into a voltage suitable for the voltage of the battery, and an output circuit that applies the AC voltage converted by the transformer to the battery.
A current limiting resistor and a capacitor for not passing a DC voltage through the battery are provided between the output terminal that applies the alternating current transformed by the transformer in the output circuit to the battery and the secondary coil of the transformer. Battery checker that has been used. In the battery checker according to claim 1, the ripple voltage measuring means includes an amplifier, a capacitor, and a voltmeter, and the amplifier amplifies the voltage between the terminals of the two differential inputs to obtain the battery. 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 , A battery checker that is a standard created to judge the degree of storage. In the battery checker according to claim 1 or 2, the storage degree detecting means uses a plurality of battery type-specific criteria according to the type of battery to be measured and a plurality of battery type-specific criteria as the setting criteria. A battery checker having a reference switching means for switching. In the battery checker according to any one of claims 1 to 3.
The ripple voltage measuring means is a ripple voltage measuring means for measuring a ripple voltage included in a terminal voltage of the battery, which is superimposed on a DC component and fluctuates periodically, and stores electricity by measuring the internal resistance of the battery. Battery checker to detect the degree.

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