CN210982605U

CN210982605U - Wireless online detection device for storage battery

Info

Publication number: CN210982605U
Application number: CN201921174351.9U
Authority: CN
Inventors: 刘进
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-07-10
Anticipated expiration: 2029-07-25

Abstract

The utility model discloses a wireless on-line measuring device of battery, including CPU, 25HZ excitation source, isolation amplifier, signal processor and electric capacity C1, C2, C3, C4, electric capacity C1, C2 are connected to the positive pole of battery, and electric capacity C3, C4 are connected to the negative pole of battery, are connected with 25HZ excitation source between electric capacity C1, C3, are connected with isolation amplifier between electric capacity C2, C4; the isolation amplifier is connected with a signal processor, and the signal processor is connected to the CPU through an A/D analog-to-digital conversion interface; and the CPU is also respectively connected with a 25HZ excitation source and a signal processor. The storage battery comprises a resistor R and a power supply E, and the resistor R is connected to the positive electrode of the power supply E. The CPU is respectively connected with a liquid crystal display screen, a keyboard and an RS232 interface.

Description

Wireless online detection device for storage battery

Technical Field

The product is suitable for direct-current power supply systems in departments of traffic, electric power, communication and the like, monitors the running state of a storage battery pack of direct-current power supply equipment, evaluates the chemical activity of the storage battery and aims to solve the problem of 'online rapid discrimination and early warning' of degraded batteries in a battery pack.

Background

The direct current power supply system is designed with a storage battery pack as an 'operating power supply' component. The emergency backup power supply is the last line of defense for ensuring the safety of the direct-current power supply system according to the use rule. The small probability characteristic of emergency backup power accidents (similar to the small probability of a fire) is extremely likely to cause widespread outages or luck. Once such an accident occurs, it has catastrophic consequences!

The direct-current power supply storage battery pack is used as a backup energy source and is in a floating charge operation mode for a long time. Most storage battery packs are provided with storage battery monitoring devices, and currently, a commonly adopted pure voltage monitoring device cannot monitor a real running state and even cannot be detected when the storage battery packs run with diseases.

The maintenance specification requires that the defects of the storage battery are judged by 'nuclear capacity', which is a traditional basic method, is a time-consuming and labor-consuming work, and a simple and effective 'indirect measurement' alternative method should be found.

The remote wireless measurement is realized, the detection limitation on the storage battery pack in a mobile state (such as a railway locomotive) or in a large scale (such as a large-scale substation) is expanded, and the characteristic of the Internet of things is realized.

Scientists discovered that there is a closer correlation between the internal resistance of a VR L a battery and its capacity than the voltage at the end of the 20 th century, the necessity of monitoring internal resistance in battery maintenance work has been identified in the international electrician's IEEE1118-1996 specification, a conclusion that has gradually become common in the industry from academic discussions.

All measurement principles of equivalent impedance should obey ohm's law: r = V/I. The device adopts the measurement principle of an alternating current excitation measurement method, namely constant alternating current excitation current I with specific frequency is loaded on a battery, alternating signal voltage V is established on a measured object, V/I is just equal to a measured impedance value, and the measured pure resistance value can be obtained after phase correction.

The resolution of not 1 micro ohm is not enough to meet the requirement of measuring the internal resistance of the storage battery. To achieve this resolution, in addition to a higher precision constant current signal source and a very high interference rejection amplifier, a good four wire connection (known under the trade name "kelvin bridge") design is required.

For the theoretical description of the battery 'electrochemical activity', the concept of 'electrochemical activity is high = conductivity is high = capacity is high' three-high rule is proposed. Therefore, the internal resistance or the reciprocal 'conductance' of the battery can represent the 'chemical activity' of the battery by 100 percent, thereby achieving the same effect as the 'nuclear capacity method'.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wireless on-line measuring device of battery to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a wireless online detection device for a storage battery comprises a CPU, a 25HZ excitation source, an isolation amplifier, a signal processor, capacitors C1, C2, C3 and C4, wherein the capacitors C1 and C2 are connected to the anode of the storage battery, the capacitors C3 and C4 are connected to the cathode of the storage battery, the 25HZ excitation source is connected between the capacitors C1 and C3, and the isolation amplifier is connected between the capacitors C2 and C4; the isolation amplifier is connected with a signal processor, and the signal processor is connected to the CPU through an A/D analog-to-digital conversion interface; and the CPU is also respectively connected with a 25HZ excitation source and a signal processor.

Preferably, the battery comprises a resistor R and a power supply E, and the resistor R is connected to the positive electrode of the power supply E.

Preferably, the CPU is respectively connected with a liquid crystal display screen, a keyboard and an RS232 interface.

Compared with the prior art, the beneficial effects of the utility model are that:

1. high-precision micro-resistance measurement;

2. one sensor can measure 8-4 2V storage batteries, is flexible in arrangement and is suitable for being matched with battery packs with any total number of batteries;

3. the radio frequency 433M L oRa digital spread spectrum technology is adopted and specially designed for long-distance, low-bandwidth, low-power consumption and Internet of things application, the communication distance (without obstruction) reaches 3,000 meters, the address capacity reaches as much as that, an isolation amplifier is connected between C4, the isolation amplifier is connected with a signal processor, the signal processor is connected to a CPU through an A/D (analog-to-digital) conversion interface, and the CPU is also respectively connected with a 25HZ excitation source and the signal processor.

Drawings

Fig. 1 is the utility model relates to a wireless on-line measuring device's of battery schematic diagram.

Detailed Description

A wireless online detection device for a storage battery comprises a CPU, a 25HZ excitation source, an isolation amplifier, a signal processor, capacitors C1, C2, C3 and C4, wherein the capacitors C1 and C2 are connected to the anode of the storage battery, the capacitors C3 and C4 are connected to the cathode of the storage battery, the 25HZ excitation source is connected between the capacitors C1 and C3, and the isolation amplifier is connected between the capacitors C2 and C4; the isolation amplifier is connected with a signal processor, and the signal processor is connected to the CPU through an A/D analog-to-digital conversion interface; the CPU is also connected with a 25HZ excitation source and a signal processor respectively.

1. high-precision micro-resistance measurement;

3. the radio frequency 433M L oRa digital spread spectrum technology is adopted and specially designed for long-distance, low-bandwidth, low-power consumption and Internet of things application, the communication distance (without obstruction) reaches 3,000 meters, the address capacity reaches up to C4, the capacitors C1 and C2 are connected to the anode of a storage battery, the capacitors C3 and C4 are connected to the cathode of the storage battery, a 25HZ excitation source is connected between the capacitors C1 and C3, an isolation amplifier is connected between the capacitors C2 and C4, the isolation amplifier is connected with a signal processor, the signal processor is connected to a CPU through an A/D analog-to-digital conversion interface, and the CPU is also connected with the 25HZ excitation source and the signal processor respectively.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A wireless online detection device for a storage battery is characterized by comprising a CPU, a 25HZ excitation source, an isolation amplifier, a signal processor and capacitors C1, C2, C3 and C4, wherein the capacitors C1 and C2 are connected to the positive pole of the storage battery, the capacitors C3 and C4 are connected to the negative pole of the storage battery, the 25HZ excitation source is connected between the capacitors C1 and C3, and the isolation amplifier is connected between the capacitors C2 and C4; the isolation amplifier is connected with a signal processor, and the signal processor is connected to the CPU through an A/D analog-to-digital conversion interface; and the CPU is also respectively connected with a 25HZ excitation source and a signal processor.

2. The wireless online detection device for the storage battery according to claim 1, wherein the storage battery comprises a resistor R and a power supply E, and the resistor R is connected to the positive electrode of the power supply E.

3. The wireless online detection device for the storage battery according to claim 1, wherein the CPU is respectively connected with a liquid crystal display screen, a keyboard and an RS232 interface.