Lithium ion battery health state on-line diagnosis method

A battery health status, lithium-ion battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as unfavorable preventive measures, high time cost and operating cost, and affecting the normal use of car owners

Active Publication Date: 2018-03-30
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

But the problem with this method is: this method must require the battery to be tested offline
The test process requires high time and operating costs, which affects the normal use of the

Method used

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  • Lithium ion battery health state on-line diagnosis method
  • Lithium ion battery health state on-line diagnosis method
  • Lithium ion battery health state on-line diagnosis method

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[0034] The present invention will be further explained below in conjunction with the drawings:

[0035] The present invention is carried out according to the following steps:

[0036] Step 1: Perform a full range DC internal resistance test on battery samples, and calculate the DC internal resistance of the battery at different SOC points.

[0037] The battery sample, that is, the battery cell sample used in the electric vehicle system, is prepared for testing the inherent internal resistance characteristics of the battery;

[0038] The full range DC internal resistance test is to perform a pulse test on the battery at different SOC (for example, every 10% SOC), and the specific process is as follows:

[0039] Step 101: The measured voltage of the battery after fully standing still at a certain SOC point (such as 90%) is U 0 , The current to the battery is I 1 Pulse charging of the battery, and continue to record the voltage data during the application of current, and then stand still, ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and specifically discloses a lithium ion battery health state on-line diagnosis method. The method includes the steps of 1, performing total-interval direct current internal resistance testing on battery samples, and calculating to obtain direct current internal resistance of the batteries at different SOC points; 2, determining a stable SOC interval of battery direct current internal resistance; 3, in a cycle use process of the batteries, performing one-time pulse charging/discharging on the batteries, and recording battery voltage change in a current abrupt change process; 4, according to the data recorded in Step 3, using the formula R=[delta]U/[delta]I to calculate internal resistance of the batteries at different time; 5, according to internal resistance values of different batteries at different time, calculating and analyzing battery polarization internal resistance change; 6, performing differentiation on internal resistance and capacity relative to the number of times of cycles to obtain a change rate distribution diagram of internal resistance and capacity; and 7, comprehensively judging the health states of the batteries, and finally adopting two pieces of data of polarization internal resistance and the internal resistance change rate to perform double judgment on the health states of the batteries.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an online diagnosis method for the health status of lithium ion batteries. Background technique [0002] With the development of cities and the improvement of living standards, society’s demand for energy continues to increase, and the impact of fossil energy on the environment has become increasingly prominent. In order to cope with the ever-increasing energy crisis and environmental pollution, the development and promotion of new energy vehicles is urgent. Power lithium-ion batteries have become one of the key technologies of new energy vehicle systems. As a complex electrochemical system, the health of lithium-ion batteries will gradually degrade with use. However, in actual use, it is difficult to directly test the parameters that characterize its health status, such as capacity. The problem of power battery state of health (SOH) diagnosis is a major p...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 周兴振张彩萍徐石明姜久春张琳静张维戈张卫国赵宇杨凤坤
Owner BEIJING JIAOTONG UNIV
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