CN215678686U - Battery internal resistance measuring device - Google Patents
Battery internal resistance measuring device Download PDFInfo
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- CN215678686U CN215678686U CN202121770162.5U CN202121770162U CN215678686U CN 215678686 U CN215678686 U CN 215678686U CN 202121770162 U CN202121770162 U CN 202121770162U CN 215678686 U CN215678686 U CN 215678686U
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- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 60
- 230000009977 dual effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
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Abstract
The utility model relates to a battery internal resistance measuring device, which comprises a Venturi bridge sine wave oscillator, a voltage amplifier, a measuring pen-shape metre, a differential amplifier, a half-wave linear rectifier filter, a universal meter integrated chip IC1 and a display screen which are electrically connected in sequence; a Venturi sine wave oscillator generates a test signal; the voltage amplifier amplifies the test signal; the measurement meter pen is connected with the anode and the cathode of the battery to be tested, applies a test signal to the battery to be tested and acquires a sampling signal; the differential amplifier amplifies the sampling signal; the half-wave linear rectification filter converts the sampling signal from an alternating current signal into a direct current signal; the universal meter integrated chip IC1 processes the sampling signal and displays the measurement result through the display screen; also comprises a power supply system. The utility model introduces an active band-pass filter and a zero adjusting circuit on the basis of an alternating current measuring method, and is used for filtering stray signals and zeroing. The error in measurement is reduced, and the method is suitable for measuring the battery with smaller internal resistance.
Description
Technical Field
The utility model relates to a device for measuring the internal resistance of a battery, belonging to the technical field of measurement of the internal resistance of the battery.
Background
The internal resistance of the battery is an important index for reflecting the performance of the battery, the change of the internal resistance of the battery is closely related to the change of an internal polar plate and an electrolyte of the battery, and the aging degree and the change condition of the capacity of the battery can be known by measuring the internal resistance of the battery, so that the battery which is about to fail is repaired or replaced in time, and the reliability and the safety of a battery system are ensured.
The method comprises the steps of measuring the voltage drop on the internal resistance of the storage battery by utilizing the discharge of the storage battery to a test instrument, and then dividing the voltage drop by the discharge current to obtain the internal resistance of the storage battery. The test current is generally large and reaches about 50A-80A. The measuring method is only suitable for the storage battery with larger capacity due to large testing current, and the bar probe is required to be stably connected with the pole of the storage battery during measurement, if the contact is not good, electric arc can be struck out, and potential safety hazards exist. The ac measurement method uses a 1K or sinusoidal ac signal applied to the battery to obtain its internal resistance by measuring its ac voltage drop, and often eliminates measurement errors by separating the voltage measurement line from the current transmission line (i.e., four-wire or three-wire measurement). However, the measuring stylus without current flowing is still a part of the sensor, and the offset voltage inherent in the operational amplifier used for amplifying the unsettled test signal causes the measurement result to have a condition of not returning to zero, that is, in the case of short circuit of the measuring stylus, a large reading exists, and the reading is generally in the order of m Ω. Since the internal resistance of the battery with smaller capacity is generally in the unit of m omega, the error of the order of m omega can not be ignored obviously. Therefore, the method is only suitable for occasions with smaller battery capacity and larger battery internal resistance.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a battery internal resistance measuring device, which introduces an active band-pass filter and a zero point adjusting circuit on the basis of an alternating current measuring method and is used for filtering stray signals and zeroing. The error in measurement is reduced, and the method is suitable for measuring the battery with smaller internal resistance.
The technical scheme of the utility model is as follows:
a battery internal resistance measuring device comprises a power supply system, a Venturi bridge sine wave oscillator, a voltage amplifier, a measuring pen-shape metre, a differential amplifier, a half-wave linear rectifier filter, a universal meter integrated chip IC1 and a display screen which are electrically connected in sequence; the power supply system provides a direct current power supply for the device; the Venturi sine wave oscillator generates a test signal; the voltage amplifier amplifies the test signal; the measurement meter pen is connected with the anode and the cathode of the battery to be tested, applies the test signal to the battery to be tested and acquires a sampling signal; the differential amplifier amplifies the sampling signal; the half-wave linear rectification filter converts the sampling signal from an alternating current signal into a direct current signal; the multimeter integrated chip IC1 processes the sampling signal and displays the measurement result through the display screen.
Further, the differential amplifier and the half-wave linear rectification filter are connected through an active band-pass filter; the active band-pass filter filters out spurious signals in the sampling signals.
Furthermore, the half-wave linear rectification filter is connected with the universal meter integrated chip through a zero point adjusting circuit; the zero point adjusting circuit is used for zero adjustment when the measuring device is in zero input.
Furthermore, the Venturi sine wave oscillator comprises a double-operational amplifier U2, wherein the 3 rd pin of the U2 is connected with one pin of a resistor R9, a resistor R10 and a capacitor C10; the other leg of the resistor R10 and the capacitor C10 is grounded; the other pin of the resistor R9 is connected with one pin of a capacitor C9; the other pin of the capacitor C9 is connected with the 11 th pin of the U2; the No. 2 pin of the U2 is connected with a resistor R6 and a resistor R8; the other pin of the resistor R8 is grounded; the other pin of the resistor R6 is connected with the 1 st pin of the dual-operational amplifier U2; the No. 1 pin of the U2 is connected with one pin of a resistor R7; and the 8 th pin and the 4 th pin of the U2 are respectively connected with the positive pole and the negative pole of the power supply system.
Preferably, the capacitance of the capacitor C9 and the capacitance of the capacitor C10 is 10nf, and the resistance of the resistor R9 and the resistance of the resistor R10 is 16k Ω.
Further, the active band-pass filter and the half-wave linear rectification filter are composed of a double operational amplifier U5 and an external circuit thereof; the 1 st pin of the U5 is connected with the 5 th pin of the U5, a resistor R40 and one pin of a capacitor C17; the other pin of the resistor R40 is connected with the 2 nd pin of the U5 and one pin of a capacitor C16; the other leg of the capacitor C16 and the other leg of the capacitor C17 are grounded through a resistor R39; the 3 rd pin of the U5 is grounded; the 4 th pin and the 8 th pin of the U5 are respectively connected with the positive pole and the negative pole of the power supply system; the 6 th pin of the U5 is connected with one pin of a capacitor C18, a capacitor C20 and a resistor R42; the other pin of the capacitor C18 is connected with the 7 th pin of the U5, the cathode of the diode D1, the capacitor C19 and one pin of the resistor R41; the other pin of the capacitor C20 is connected with one pin of an anode resistor R43 and a resistor R44 of a diode D1; the other pin of the resistor R42 is connected with the other pin of the resistor R41, the anode of the diode D2 and one pin of the capacitor C21; the other leg of the capacitor C21 and the resistor R44 are both grounded; the other pin of the capacitor C19 is connected with the anode of a diode D3 and the cathode of the diode D2; the cathode of the diode D3 is connected with the other pin of the resistor R43 and one pin of the resistor R45; the other pin of the resistor R45 is connected with the anode of an electrolytic capacitor C15; the negative electrode of the electrolytic capacitor C15 is grounded.
Further, the zero point adjusting circuit comprises a potentiometer VR1 and an external circuit thereof; one pin of the resistor R12 is connected with the pin 3 of the VR1 and the pin 11 of the IC 1; the other pin of the resistor R12 is connected with the negative pole of the power supply system; the No. 1 pin and the No. 2 pin of the VR1 are both connected with the anode of the power supply system.
The utility model has the following beneficial effects:
1. according to the measuring device, an active band-pass filter is introduced on the basis of an alternating current measuring method, stray signals are filtered, and the measuring stability and accuracy are ensured.
2. The measuring device introduces a zero point adjusting circuit, performs zero point adjustment in a zero input state before use, reduces additional errors during measurement, and is suitable for measurement of smaller internal resistance of the battery.
3. The measuring device adopts an alternating current measuring method, a sine alternating current signal of 1KHz is loaded to the anode and the cathode of a battery to be measured, and the internal resistance of the battery is obtained by measuring the voltage drop of the sine alternating current signal. Compared with a direct current measurement method, the method is more convenient and safe to operate.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention.
Fig. 2 is a circuit schematic of an embodiment of the utility model.
Fig. 3 is a schematic diagram of a venturi bridge sine wave oscillator circuit of an embodiment of the present invention.
Fig. 4 is a schematic diagram of an active band pass filter circuit according to an embodiment of the present invention.
Fig. 5 is a circuit schematic of a half-wave linear rectification filter of an embodiment of the present invention.
Fig. 6 is a schematic diagram of a zero point adjustment circuit according to an embodiment of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1-6, a battery internal resistance measuring device comprises a venturi bridge sine wave oscillator, a voltage amplifier, a measuring stylus, a differential amplifier, a half-wave linear rectifier filter, a multimeter integrated chip IC1 and a display screen which are electrically connected in sequence; the Venturi sine wave oscillator generates a test signal, according to IEC61960, when the internal resistance of the battery is measured by an alternating current measurement method, an alternating current voltage with the frequency of 1KHz is selected, and the Venturi bridge sine wave oscillator can generate a stable sine alternating current signal with the frequency of 1KHz as the test signal; the voltage amplifier amplifies the test signal; the measurement meter pen is connected with the anode and the cathode of the battery to be tested, applies the test signal to the battery to be tested and acquires a sampling signal; the differential amplifier amplifies the sampling signal, and has excellent common mode rejection ratio and good amplification effect on the sampling signal; the half-wave linear rectification filter converts the sampling signal from an alternating current signal into a direct current signal, so that the universal meter integrated chip IC1 can process the sampling signal conveniently; the multimeter integrated chip is a series of chips special for multimeters, such as SD7830, SD7835, SD7890 and the like, the multimeter integrated chip IC1 processes the sampling signals and displays measurement results through the display screen; in the embodiment of the utility model, the battery is selected as the power supply system of the device, so that the device has the advantages of convenience in replacement, low cost and easiness in acquisition.
In at least one embodiment, the differential amplifier and the half-wave linear rectifier filter are connected by an active band pass filter; the active band-pass filter filters stray signals in the sampling signals, eliminates interference of the stray signals on measurement results, and improves the stability and accuracy of measurement.
In at least one embodiment, the half-wave linear rectification filter is connected with the multimeter integrated chip through a zero point adjusting circuit; the zero point adjusting circuit is used for zero adjustment when the measuring device is in zero input, eliminating errors in zero input and improving the measurement precision of the battery with smaller internal resistance.
In at least one embodiment, the Venturi sine wave oscillator comprises a double operational amplifier U2, wherein the No. 3 pin of the U2 is connected with one pin of a resistor R9, a resistor R10 and a capacitor C10; the other leg of the resistor R10 and the capacitor C10 is grounded; the other pin of the resistor R9 is connected with one pin of a capacitor C9; the other pin of the capacitor C9 is connected with the 11 th pin of the U2; the No. 2 pin of the U2 is connected with a resistor R6 and a resistor R8; the other pin of the resistor R8 is grounded; the other pin of the resistor R6 is connected with the 1 st pin of the dual-operational amplifier U2; the No. 1 pin of the U2 is connected with one pin of a resistor R7; and the 8 th pin and the 4 th pin of the U2 are respectively connected with the positive pole and the negative pole of the power supply system. The dual operational amplifier U2 can select the common dual operational amplifiers such as TL082, LM358 and TL 062. In the Venturi sine wave oscillator circuit, the oscillation frequency F of a generated test signal meets the following conditions:
since the frequency of the test signal is 1KHz, in this embodiment, the capacitance of the capacitor C9 and the capacitor C10 is 10nf, and the resistance of the resistor R9 and the resistor R10 is 16k Ω.
In at least one embodiment, the active band-pass filter and the half-wave linear rectification filter are composed of a dual operational amplifier U5 and an external circuit thereof; the 1 st pin of the U5 is connected with the 5 th pin of the U5, a resistor R40 and one pin of a capacitor C17; the other pin of the resistor R40 is connected with the 2 nd pin of the U5 and one pin of a capacitor C16; the other leg of the capacitor C16 and the other leg of the capacitor C17 are grounded through a resistor R39; the 3 rd pin of the U5 is grounded; the 4 th pin and the 8 th pin of the U5 are respectively connected with the positive pole and the negative pole of the power supply system; the 6 th pin of the U5 is connected with one pin of a capacitor C18, a capacitor C20 and a resistor R42; the other pin of the capacitor C18 is connected with the 7 th pin of the U5, the cathode of the diode D1, the capacitor C19 and one pin of the resistor R41; the other pin of the capacitor C20 is connected with one pin of an anode resistor R43 and a resistor R44 of a diode D1; the other pin of the resistor R42 is connected with the other pin of the resistor R41, the anode of the diode D2 and one pin of the capacitor C21; the other leg of the capacitor C21 and the resistor R44 are both grounded; the other pin of the capacitor C19 is connected with the anode of a diode D3 and the cathode of the diode D2; the cathode of the diode D3 is connected with the other pin of the resistor R43 and one pin of the resistor R45; the other pin of the resistor R45 is connected with the anode of an electrolytic capacitor C15; the negative electrode of the electrolytic capacitor C15 is grounded. The cost of the device is reduced by forming the active band-pass filter and the half-wave linear rectification filter by the double operational amplifiers. Meanwhile, the probability of damage to the device is reduced by reducing the number of double operational amplifiers.
In at least one embodiment, the zero adjustment circuit includes a potentiometer VR1 and its external circuitry; one pin of the resistor R12 is connected with the pin 3 of the VR1 and the pin 11 of the IC 1; the other pin of the resistor R12 is connected with the negative pole of the power supply system; the No. 1 pin and the No. 2 pin of the VR1 are both connected with the anode of the power supply system. Zero input is carried out during zero input, zero input errors caused by various factors such as electric wires can be eliminated, and the precision is obviously improved when the battery with small internal resistance is measured.
Referring to fig. 1-6, the working principle of the present invention is as follows:
when the utility model is used, zero setting is firstly carried out. And when the zero adjustment is carried out, the measuring stylus is in short circuit, and the potentiometer VR1 is adjusted, so that the direct current input voltage of the 11 th pin of the IC1 is equal to zero, and the measuring result is not zero when the zero input is caused by the measuring stylus, the measuring wire or other factors in step length.
When measuring the internal resistance of the battery, connecting the two ends of the measuring meter pen with the anode and the cathode of the resistor to be measured, and turning on a power supply system to measure the internal resistance of the battery.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (7)
1. A battery internal resistance measuring device is characterized by comprising a Venturi bridge sine wave oscillator, a voltage amplifier, a measuring pen-shape metre, a differential amplifier, a half-wave linear rectifier filter, a universal meter integrated chip IC1 and a display screen which are electrically connected in sequence; the Venturi bridge sine wave oscillator generates a test signal; the voltage amplifier amplifies the test signal; the measurement meter pen is connected with the anode and the cathode of the battery to be tested, applies the test signal to the battery to be tested and acquires a sampling signal; the differential amplifier amplifies the sampling signal; the half-wave linear rectification filter converts the sampling signal from an alternating current signal into a direct current signal; the universal meter integrated chip IC1 processes the sampling signal and displays the measurement result through the display screen; the device also comprises a power supply system for providing direct current power supply for the device.
2. The battery internal resistance measuring device according to claim 1, wherein the differential amplifier and the half-wave linear rectification filter are connected by an active band-pass filter; the active band-pass filter filters out spurious signals in the sampling signals.
3. The battery internal resistance measuring device according to claim 2, wherein the half-wave linear rectifying filter is connected with the multimeter integrated chip through a zero point adjusting circuit; the zero point adjusting circuit is used for zero adjustment when the measuring device is in zero input.
4. The battery internal resistance measuring device according to claim 3, wherein the Venturi sine wave oscillator comprises a double operational amplifier U2, and the 3 rd pin of the U2 is connected with one pin of a resistor R9, a resistor R10 and a capacitor C10; the other leg of the resistor R10 and the capacitor C10 is grounded; the other pin of the resistor R9 is connected with one pin of a capacitor C9; the other pin of the capacitor C9 is connected with the 11 th pin of the U2; the No. 2 pin of the U2 is connected with a resistor R6 and a resistor R8; the other pin of the resistor R8 is grounded; the other pin of the resistor R6 is connected with the 1 st pin of the dual-operational amplifier U2; the No. 1 pin of the U2 is connected with one pin of a resistor R7; and the 8 th pin and the 4 th pin of the U2 are respectively connected with the positive pole and the negative pole of the power supply system.
5. The apparatus of claim 4, wherein the capacitance of the capacitor C9 and the capacitance of the capacitor C10 are 10nf, and the resistance of the resistor R9 and the resistance of the resistor R10 are 16k Ω.
6. The battery internal resistance measuring device according to claim 3, wherein the active band-pass filter and the half-wave linear rectification filter are composed of a dual operational amplifier U5 and an external circuit thereof; the 1 st pin of the U5 is connected with the 5 th pin of the U5, a resistor R40 and one pin of a capacitor C17; the other pin of the resistor R40 is connected with the 2 nd pin of the U5 and one pin of a capacitor C16; the other leg of the capacitor C16 and the other leg of the capacitor C17 are grounded through a resistor R39; the 3 rd pin of the U5 is grounded; the 4 th pin and the 8 th pin of the U5 are respectively connected with the positive pole and the negative pole of the power supply system; the 6 th pin of the U5 is connected with one pin of a capacitor C18, a capacitor C20 and a resistor R42; the other pin of the capacitor C18 is connected with the 7 th pin of the U5, the cathode of the diode D1, the capacitor C19 and one pin of the resistor R41; the other pin of the capacitor C20 is connected with one pin of an anode resistor R43 and a resistor R44 of a diode D1; the other pin of the resistor R42 is connected with the other pin of the resistor R41, the anode of the diode D2 and one pin of the capacitor C21; the other leg of the capacitor C21 and the resistor R44 are both grounded; the other pin of the capacitor C19 is connected with the anode of a diode D3 and the cathode of the diode D2; the cathode of the diode D3 is connected with the other pin of the resistor R43 and one pin of the resistor R45; the other pin of the resistor R45 is connected with the anode of an electrolytic capacitor C15; the negative electrode of the electrolytic capacitor C15 is grounded.
7. The apparatus of claim 3, wherein the zero point adjusting circuit comprises a potentiometer VR1 and its external circuit; one pin of the resistor R12 is connected with the pin 3 of the VR1 and the pin 11 of the IC 1; the other pin of the resistor R12 is connected with the negative pole of the power supply system; the No. 1 pin and the No. 2 pin of the VR1 are both connected with the anode of the power supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770162.5U CN215678686U (en) | 2021-07-30 | 2021-07-30 | Battery internal resistance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770162.5U CN215678686U (en) | 2021-07-30 | 2021-07-30 | Battery internal resistance measuring device |
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| CN215678686U true CN215678686U (en) | 2022-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660774A (en) * | 2023-06-28 | 2023-08-29 | 国网浙江省电力有限公司建德市供电公司 | A battery internal resistance online monitoring device, system and method |
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2021
- 2021-07-30 CN CN202121770162.5U patent/CN215678686U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660774A (en) * | 2023-06-28 | 2023-08-29 | 国网浙江省电力有限公司建德市供电公司 | A battery internal resistance online monitoring device, system and method |
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