*ChapterLYXC-1000Shanghai Battery Internal Resistance TesterIntroduction

1. Explanation

This manual is a guide for using the LYXC-1000 battery internal resistance tester. Please read this manual carefully before operating the tester.

2.LYXC-1000Shanghai Battery Internal Resistance Testerhost component

2.1 USB interface: used to upload test data and download parameters through a USB flash drive;

2.2 Test interface: Connect the test fixture;

2.3 Charging interface: Connect the charger;

2.4 LCD: 320 * 240 color TFT LCD screen;

2.5 Keyboard: There are a total of 7 keys. Defined as shown in Table 1.

Table 1LYXC-1000List of Keyboard Functions

Can test the voltage, internal resistance, and capacity of the battery; 3. Main functional features

Can be used as a voltmeter to test battery voltage;

Can automatically switch between batteries of different voltage levels;

Can calculate the capacity of the battery;

Synchronized storage of test data;

Provide audio prompts for the discrimination results;

Battery charging status indication;

Real time display of local battery voltage;

Automatic standby without operation;

Test data recording and storage;

Exchange data through USB drives and analysis software systems.

4.LYXC-1000technical indicators

Chapter 2 Internal Resistance Test Instructions

The internal impedance of a battery, also known as internal resistance, is a key indicator that affects battery performance. It is a consensus in the industry to test the internal resistance of batteries to determine their power supply capability. The factors that affect battery internal resistance include battery size, working time, structure, condition, temperature, and charging status.

For a fully charged battery, its internal resistance gradually increases slowly when the battery is discharged; When the battery is discharged to a certain extent, the change in internal resistance increases rapidly; After the battery is discharged, its resistance is 2-5 times greater than when it is in a charged state.

The battery temperature also affects the measurement of internal resistance, but it is only noticeable below freezing point. Below 32 ℉, temperature has a significant impact on internal resistance, and at -20 ℉, the internal resistance is twice as high as before. That's why the energy of batteries is much lower in winter.

The usage time of a battery can also affect its internal resistance. The longer the battery is used, the greater the internal resistance with increasing salt formation. The increase in internal resistance is related to the use and maintenance methods of the battery. The overall condition of the battery (such as mechanical device failure) can also affect the internal resistance of the battery. Some failure modes can increase the internal resistance of the battery.

Due to differences in production processes and formulas among different manufacturers, the internal resistance of batteries with the same capacity may vary. Therefore, the judgment of battery quality should not be limited to the value of battery internal resistance, but should also refer to the trend of changes in battery internal resistance. When the internal resistance of the battery exceeds 1.25 times the initial internal resistance, the battery cannot pass the test. When the internal resistance of the battery changes to 2 times the initial internal resistance, the capacity of the battery structure is less than 80%.

This internal resistance meter uses the instantaneous discharge method to measure the internal resistance of the battery. Through analysis and research on the actual working conditions of batteries, it can be found that the ports of batteries exhibit impedance characteristics in the external circuit. In practical use, the inductance formed by the electrodes, connecting wires, etc. of the battery is generally not considered in analysis and research due to its low frequency of use, short lead wires, and weak inductance.

Generally, we divide the resistance of a battery into metal resistance, also known as Ohmic resistance; Electrochemical resistance, including electrochemical reaction resistance and particle concentration polarization resistance. Regarding the capacitive impedance part, Faraday capacitors can be equivalent to a voltage source due to their constant voltage characteristics. In addition, by equivalently changing other capacitance resistances to multiple capacitors in parallel, the equivalent model of the battery can be simplified as shown in Figure 1.

Figure 1 Simplified equivalent model of battery

Rm is the metal resistance, which slowly changes with factors such as corrosion, creep, and vulcanization of the metal. The electrochemical resistance Re constantly changes with the state of capacity, but this change is masked by the capacitance impedance variation of the parallel connected capacitors. In communication situations, due to the large capacitance C, most of the current flows through the capacitor, while Re has less shunt. At this time, the detected impedance is actually the series connection of Rm and C, while Re is ignored. In order to avoid the diversion of C, a large instantaneous discharge current is directly generated by the battery, and then the instantaneous change in voltage on the battery pole is measured, as shown in Figure 2. The corresponding internal resistance can be derived from the instantaneous voltage drop when the load is turned on and the instantaneous voltage recovery when the load is disconnected.

In the case of instantaneous DC, the equivalent model of the battery can be considered as a series connection of a voltage source and internal resistance (Thevenin equivalent model), as shown in Figure 3.

Δ U=Rinternal, hence Rinternal=Δ U/I

In theory, there are two values of Δ U here: one is the drop in battery voltage at the moment when a load is applied to the test circuit, and the other is the recovery value of battery voltage at the moment when the load is disconnected. However, during the experimental process, both voltage and current are prone to introduce significant shocks at the moment of closing, resulting in large errors. Therefore, the recovery value of voltage is uniformly used here, and at this time, the current has basically reached steady state.

This internal resistance meter can measure voltage, internal resistance, and estimate the remaining capacity of the battery.

Chapter 3 Usage Method

1. Preparation

Connect the test line and internal resistance meter through a plug.

The local battery should be fully charged.

2. Visual inspection

Before using the tester for testing, the tested battery should be checked as follows:

Whether the battery box to be tested is broken.

Check if the battery cell cover is cracked.

The sealing condition of the battery box and battery cell cover to be tested.

Are the battery connectors or terminals under test corroded.

Whether the pressure plate of the battery to be tested is too loose or too tight, causing internal rupture of the battery.

The dirt or conductive acid on the upper part of the battery under test.

Wear, breakage, or damage of cables or wires.

The battery connector under test is corroded or too loose.

3. Precautions

When using this internal resistance tester for testing, all equipment manufacturers' precautions and warnings should be observed.

Before testing, carefully check the connections of all test leads.

Confirm that the test clip is securely connected to the battery terminal.

Confirm that the positive and negative poles are correctly connected to the battery terminals.

If the polarity is reversed or not connected, the voltage will be displayed as zero.

The battery clip must be securely connected to the battery. Otherwise, incorrect diagnosis will occur. For batteries with terminals on the side, clamp the test clip onto the terminal of the circular cable instead of the terminal of the square cable. To ensure a secure connection, it is necessary to remove the battery clamp bolt and replace it with a side adapter. Before installation, check if the gap between the terminal posts is sufficient.

4. Battery testing

pressPress the key for 1 second to turn on the power of the tester. Automatically enter the 'Battery Test' interface.

In the "Battery Test" interface, press the Enter key to perform battery testing, press the left and right keys to switch menus, and the serial number represents the currently saved serial number value; The icon in the upper right corner displays the internal lithium battery level; Voltage display shows the voltage value of the tested battery; The internal resistance is the value of the internal resistance of the tested battery (unit: m Ω); The capacity is the percentage of remaining capacity of the tested battery; The temperature is the current ambient temperature; The model is the ampere hour of the measured battery, which can be selected by pressing the up and down keys. When the "model" changes to "base value", it means that the measurement is based on the base value of the battery (full capacity resistance value of the battery). Users can set the base value of the battery in the "System Settings" menu under "Base Value Setting".

Explanation:The key is the power on key. When the power is turned off, press it to turn on the power. When the power is turned off, press the key to turn on the power. Each press must last for at least 1 second to be effective.

5. Historical records

Press the ← and → keys on the interface to enter the [History] interface.

The historical records are arranged from the saved values, and the page flipping operation is performed by pressing the ↑↓ keys

6. System settings

Press the ← and → keys on the or [History] interface to enter the interface, and press Enter to clear all saved data!

Among them, the [base value setting] sets the full capacity internal resistance value of the battery, for example, the full capacity internal resistance value of a certain brand 2V 300Ah battery is 650 micro ohms, which is provided by the battery manufacturer; 【 Time Setting 】 Set the system date and time; Save the data to a USB flash drive and clear it locally. When writing to the USB flash drive, save it as an NZYV20.TXT file; 【 Factory settings 】 Set by the manufacturer, customers generally do not need to make any settings.

7. Explanation of prompt sound

When turned on, the buzzer emits a short "beep" sound.

Press the Enter key on the interface to perform a battery test, and the buzzer will emit a short "beep" sound at the beginning and end of the test.

When the internal temperature exceeds a certain value, the internal resistance meter needs to be cooled and the buzzer emits a continuous "beep beep" sound. At this time, battery testing is disabled. After waiting for cooling, the buzzer emits a short "beep" sound. At this time, battery testing can continue.

After the data is successfully saved to the USB drive, the buzzer emits a short "beep" sound.

1. Overview

In recent years, the widespread adoption of valve regulated batteries has raised higher requirements for the performance of chargers. The former Ministry of Electric Power has formulated relevant control standards. Clear requirements are put forward for the voltage stabilization accuracy, current stabilization accuracy, and ripple coefficient of the charging machine. The damage to batteries is often caused by excessive ripple coefficient. The total ripple coefficient of the charger changes during long-term operation. In order to control the ripple coefficient and ripple content (AC ripple amount) of each group of chargers, we have specially developed this product. Can monitor the ripple content and ripple coefficient of DC power supply in real-time and accurately throughout the entire process.

1. Instrument working principle

Ripple meter principle diagram:

3、 Main technical indicators:

1. Measurement voltage range: 24-260DC, measurement accuracy better than 1%
2. Ripple voltage range: 0-9999mV, measurement accuracy better than 2%
3. Ripple coefficient 0-9.999%
4. Segment code LCD display

Note: Ripple factor=(ripple voltage ÷ total voltage) × 100%

4、 Characteristics

① Adopting a new high-speed sampling chip and high-speed signal processing.

② The characteristics of small size, light weight, high precision, and convenient portability.

③ The sampling rate reaches 1000KHZ, which can comprehensively monitor the DC ripple content.

④ Capable of RS232 communication.

⑤ Meet all DC power sources of 24-260V.

⑥ Real time comprehensive monitoring of DC voltage value, ripple value, ripple coefficient, etc.

5、 Instructions for use

Power on operation: Use wires to lead out the two terminals of the ripple meter test DC power supply and connect them to the positive and negative ends of the tested power supply, with the red terminal connected to the positive terminal and the black terminal connected to the negative terminal. Turn on the power, the ripple meter starts working, and the first displayed value is the battery voltage (only displayed before startup and when the voltage is below 10.5V).

Then the cycle displays the DC voltage (v), DC ripple voltage (mv), and ripple factor (%) from top to bottom.

Software operation: There are two files in the CD that comes with our company:

USB recognition driver: Click on the EXE file in the driver folder to install it.

Upper computer software: Double click SETUP in the folder to install. When installing this system * times, you need to wait patiently for a few minutes. If the system requires a restart, please do so. The software will automatically resume installation after restarting.

Communication: Install software from the CD. When communicating with the upper computer, connect the device to the PC through the communication port, run the device, open the upper computer software, and start communication (default baud rate 9600)

Save data: The system provides data saving function, which can save data as an Excel document for data analysis and saving.

6、 Dimensions (in millimeters)

238*134*44mm

7、 Usage method

Turn on the power switch, supply power to the ripple meter, and then test the two heads of the ripple meter for the DC power supply. Contact the positive and negative ends of the power supply to be tested, with the positive connected to the positive and the negative connected to the negative. When the ripple meter is powered on, it starts working and displays DC voltage (V), DC ripple voltage (MV), and ripple factor (%) from top to bottom.

8、 Precautions

1) Please handle the instrument with care to avoid damage.

2) If there are any problems with the product during use, please contact our company promptly.

9、 After sales service support and commitment

a. For those who order this product, our company will be responsible for free installation, debugging, and provide technical training and consultation to users.

b. The product quality warranty period is within 12 months from the date of manufacture.

c. During the warranty period, if there are manufacturing quality issues with the instrument, we are responsible for free replacement.

Explanation: Due to the continuous improvement of the product, this manual cannot cover all possible situations. If you have any questions or encounter other special problems, please contact our technical department to obtain the necessary support. We apologize for any inconvenience caused.