Testing method for prolonging cycle life of lithium iron phosphate power lithium battery

A technology of cycle life and lithium iron phosphate, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of short cycle life and long test time of lithium batteries, reduce polarization, shorten charging time, speed up Effects of Power Decay and Lifetime Decay

Inactive Publication Date: 2018-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] A test method for improving the cycle life of lithium iron phosphate power lithium battery proposed by t

Method used

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  • Testing method for prolonging cycle life of lithium iron phosphate power lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature of 25°C, the cycle life test of a cylindrical lithium iron phosphate battery with a rated capacity of 12Ah is carried out according to the following steps: 1) 1C constant current charging to 3.5V, 0.5C constant current charging to 3.65V (charging time is about 1h16min ); 2) Stand still for 10min; 3) 1C constant current discharge to 2.00V; 4) Stand still for 10min. The capacity retention rate in the cycle was recorded, and the test results are shown in Table 1.

Embodiment 2

[0032] At room temperature of 25°C, the cycle life test of a cylindrical lithium iron phosphate battery with a rated capacity of 12Ah is carried out according to the following steps: 1) 0.8C constant current charging to 3.55V, 0.5C constant current charging to 3.65V (charging time is about 1h23min); 2) Stand still for 10min; 3) 1C constant current discharge to 2.00V; 4) Stand still for 10min. The capacity retention rate in the cycle was recorded, and the test results are shown in Table 1.

Embodiment 3

[0034] At room temperature of 25°C, the cycle life test of a cylindrical lithium iron phosphate battery with a rated capacity of 12Ah is carried out according to the following steps: 1) 1C constant current charge to 3.45V, 0.5C constant current charge to 3.55V, 0.2C constant current Charge to 3.65V (charging time is about 1h44min); 2) Stand still for 10min; 3) Discharge at 1C constant current to 2.00V; 4) Stand still for 10min. Record the capacity retention rate in the cycle, the test steps are shown in Table 1, and the cycle data are as follows figure 1 shown.

[0035] Comparison / Example

Cycle test charging steps

comparative example

0.5C constant current charging to 3.65V, constant voltage charging to 0.05C

Example 1

1C constant current charging to 3.5V, 0.5C constant current charging to 3.65V

Example 2

0.8C constant current charging to 3.55V, 0.5C constant current charging to 3.65V

Example 3

1C constant current charge...

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Abstract

The invention provides a testing method for prolonging the cycle life of a lithium iron phosphate power lithium battery. The technical problems that the cycle life of lithium battery is short, and thetesting time is long can be solved. The testing method the steps of two-to-three-step constant-current charge and one-step constant-current discharge, wherein during constant-current charge, a largecurrent is used firstly for conducting constant-current charge till the voltage exceeds the platform voltage, and then a small current is used for conducting constant-current charge till the voltage is the charge cut-off voltage; and after still standing, constant-current discharge is conducted till the voltage is the discharge cut-off voltage. Through the cycle testing method adopting convertingof large-current constant-current charge into small-current constant-current charge, the charge rate of the charge tail section is decreased, and thus polarization of the battery is reduced; on the one hand, the testing period of the cycle life can be shortened on the basis that the cycle life of the battery is ensured; on the other hand, the testing method is closer to a vehicle charge mode, andeffective suggestions can be provided for the charge control strategy of vehicles.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a test method for improving the cycle life of lithium iron phosphate power lithium batteries. Background technique [0002] In recent years, under the continuous stimulation of new energy vehicle incentive policies, the market demand for new energy vehicles has doubled, and electric vehicles have entered the stage of widespread promotion. However, customers' demand for electric vehicles is not only safety, cruising range, but also service life and charging time requirements, which is also the key to the popularization and promotion of electric vehicles. [0003] At this stage, the cycle life test of the battery usually adopts the method of GB / T31484-2015 to test the standard cycle life, that is, charge with 1C constant current and constant voltage, and then discharge with 1C constant current after standing still. As the battery ages, the internal resistance and pol...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 苗萌叶加久厉运杰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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