What properties do lithium battery cycle performance tests mainly test?

Introduction What properties are mainly tested in the lithium battery cycle performance test? Take 3C lithium battery as an example: 3C lithium battery performance test is one of the items that need to be carried out in the test, including life, rate.

What properties do lithium battery cycle performance tests mainly test?

Take 3C lithium battery as an example:

The performance test of 3C lithium battery is one of the necessary parts of the test, including lifespan, rate , high and low temperature discharge, safety test, etc.

1. Lifespan

The cycle count of a 3C lithium battery reflects the number of times the battery can be repeatedly charged and discharged. Depending on the environment in which 3C lithium batteries are used, the service life can test the battery life at low temperature, normal temperature and high temperature.

2. Rate

In today's busy life, the requirements for fast charging of 3C lithium batteries are also higher and higher. Therefore, the performance of 3C lithium batteries needs to be tested.

3. High and low temperature discharge test

In the high and low temperature test environmentsse temperature, the 3C lithium battery is charged and discharged after the charge and discharge cycle is completed. the curve and the data are preserved. Compare it with the curve and data at normal temperature to see if it meets what is stated in the specifications.

4. Safety Test

The safety test of 3C lithium batteries includes overcharge, overdischarge, short circuit, dropping, heating, vibration, extrusion, acupuncture, etc. Foreign objects actively damage the battery to test battery safety.

3C lithium battery testing requires large current. The maximum overcurrent of the shrapnel microneedle module can reach 50A. The current transmission is very stable in the range of 1-50A and maintains a good connection.

Lithium battery test

Lithium battery is a rechargeable battery that uses lithium ions ase working substance. It is used for products that must provide electrical energy such as new energy. vehicles, cell phones and laptops. Important power source.

The main application areas of lithium batteries are:

Rechargeable consumer electronics: Mobile phones, digital cameras, laptops, etc.

New energies; Automotive power batteries: Electric vehicles, hybrid vehicles, etc.

Storage batteries: Various energy storage equipment, grid peak replacement, etc. ; >

Industrial and commercial fields: Drones, power tools, backup power supplies, etc.

Gas inspection and helium inspection are common methods for testing the airtightness of lithium batteries and have high precision and sensitivity.és.

Airtight Detector Test: Test the battery case for airtightness.

Helium Mass Spectrometer Leak Detector Test: Use helium gas to check the airtightness of the internal structure of the battery.

New energy lithium battery airtightness detector

If you want to know more detailed airtightness test solutions and cases application, please pay attention to the airtightness of Jingcheng Engineering

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How is the battery performance tested?

Lithium battery charging cut-off voltage does not need to be tested and is not defined by the manufacturer. This is the battery itself. Withstands a safe voltage. The battery voltage after disconnection depends on the battery performance. If the performance is good, it will be very closee of the value of the battery parameter when it leaves the factory. For example, the best battery voltage marked by. the manufacturer is 12.5. After using 12.76 to fully charge and turn on the light, the battery voltage will be around 12.5. That's it

First analysis from the first dimension of the tests. Battery product specifications usually provide basic parameters such as battery capacity, rated voltage, weight and size, energy density (power, volume), etc. In the appendix you will find charge and discharge curves at different rates and charge and discharge curves at different temperatures. .And the life curve at a precise pace. However, it is not enough to only use the information contained in the specifications to fully understand the battery characteristics and achieve comprehensive battery management. So, what elementsts tests are necessary? The BOL test is easy to understand. The first step is of course the BOL (Beginning of Life) test, which is a complete physical examination of the battery in the early stages of its life.

The tests to be carried out mainly include: capacity test, mixed pulse power performance test, flow performance test, self-discharge test, etc. Capacity testing requires the use of Static Capacity Testing (SCT) to measure available battery capacity (including energy) at different ambient temperatures. Different companies and standards have differences in SCT testing methods, but the general idea is similar. Example: Fully charge the battery using the method specified by the battery manufacturer at room temperature (25°C), then discharge it to the cut-off voltage (2.5V) at a rate of 1C after having left it completely in the environmentent tested, and record the capacity released (energy). In real experiments, the test can be repeated three times in a row to take the average value to improve the accuracy. Capacity test Output: relationship table between temperature and capacity (energy). Take time T as the X axis and voltage V as the Y axis. The point on the X axis where the 1C discharge ends at different temperatures is the relationship between capacitance and temperature. The ratio between the area formed by each discharge curve and the X and Y axes is the ratio of the energy available at different temperatures. As shown in the figure below: the S zone of the gray part of the available battery energy at -20°C. It can be seen that SOE can express the remaining energy more accurately than SOC, thus evaluating the remaining mileage more accurately.

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