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Power characteristic test method of lithium ion battery

A technology of lithium-ion battery and power characteristics, which is applied in the direction of electric power measurement through current/voltage, measurement of electricity, measurement device, etc., can solve problems such as large deviation from the actual situation, and achieve the effect of facilitating the comparison of product power characteristics

Active Publication Date: 2019-04-16
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for testing the power characteristics of a lithium-ion battery, which systematically evaluates the power characteristics of the battery and solves the problem of large deviation from the actual situation in the test process

Method used

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  • Power characteristic test method of lithium ion battery
  • Power characteristic test method of lithium ion battery
  • Power characteristic test method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Taking a 18650-1100mAh-3.2V battery as an example, the test steps for continuous charge and discharge power characteristics are as follows:

[0056] 1. Continuous charging power characteristic test:

[0057] (1) The battery is placed at room temperature for more than 12 hours, and the battery is discharged at 1C to the cut-off voltage, and the battery is left standing for 10 minutes.

[0058] (2) Charge according to the 2C current respectively, and switch to constant voltage charging when the constant current charging reaches the charging termination voltage specified by the product, until the charging current drops to 0.05C 1 (mA) when charging is stopped, such as figure 1 .

[0059] (3) Calculate the ratio of the constant current charged electricity C1=1.017Ah to the total charged electricity C0=1.075Ah, that is, α=C1 / C0=1.017 / 1.075=0.946.

[0060] (4) Calculate the average voltage U1 during the constant current process, U1=W1 / C1=3.478Wh / 1.017Ah=3.420V.

[0061] 2...

Embodiment 2

[0068] Taking a 26650-2300mAh-3.2V battery as an example, the pulse power characteristic test steps are as follows:

[0069] (1) Take two batteries and charge them with a constant current to 50% SOC.

[0070] (2) Place the battery at -20°C for 12 hours.

[0071] (3) Discharge the battery according to the current of 20C, the discharge time is 10 seconds, and the discharge stop interval is 30 seconds. Discharge was then performed for 10 seconds, and the discharge was stopped for 30 seconds.

[0072] (4) Select different time points a during the test as 0.1 seconds, 2 seconds, 5 seconds, 10 seconds, 40.1 seconds, 42 seconds, 45 seconds, and 50 seconds. The corresponding current is Ia, voltage is Ua, and power Pa= Ua×Ia, as shown in Table 1.

[0073] (5) Repeat the above steps to test and set the temperature in step (2) to 25°C. The test results are shown in Table 1.

[0074] From the above tests and the data in the table, it can be seen that under low temperature conditions,...

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Abstract

The invention provides a power characteristic test method of a lithium ion battery. The power characteristic test method comprises a continuous charge and discharge power characteristic test, a continuous charge and discharge power characteristic ratio, and a pulse power characteristic test. The continuous power characteristics of the battery are tested at different temperatures to better reflectthe power characteristics of the battery in actual environments. The continuous charge and discharge power characteristic ratio is proposed to better reflect the advantages and disadvantages of the power characteristics of the battery and facilitate the comparison of the power characteristics of the product. The power characteristics of the battery under different ambient temperatures and charge state can be tested and simulated more comprehensively by the pulse power characteristics. The voltage change condition of the battery can be tested according to the actual power use conditions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a method for testing the power characteristics of lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, small self-discharge, and excellent cycle performance, lithium-ion batteries are widely used in backup power supplies, energy storage devices, electric vehicles, electric bicycles, and power tools. Lithium battery electrical performance evaluation test items mainly include internal resistance, voltage, capacity, cycle characteristics, self-discharge characteristics and power characteristics. Among them, the power characteristics of the lithium-ion battery are greatly affected by the design of the battery itself, and the power characteristics are also an important indicator for evaluating the quality of the battery. The power characteristics of the same battery at different temperatures and different SOCs are quite differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R21/06
CPCG01R21/06
Inventor 李涛王勇周会
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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