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Detection and diagnosis method of battery charging capacity and battery health status

A battery health status and detection method technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of huge investment in time and labor costs, inability to perform fast, non-destructive testing, complex and time-consuming testing processes, etc.

Active Publication Date: 2017-06-16
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In short, the existing battery SOH evaluation has the following disadvantages: the detection process is complex and time-consuming, and the time and labor costs are huge; the evaluation level is not deep enough, and it can only describe the appearance but not the essence; it cannot achieve fast and non-destructive testing.

Method used

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  • Detection and diagnosis method of battery charging capacity and battery health status
  • Detection and diagnosis method of battery charging capacity and battery health status
  • Detection and diagnosis method of battery charging capacity and battery health status

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Please refer to Figure 3~6 .

[0074] This Example 1 provides a 18650 lithium iron phosphate / graphite power battery cell with a rated capacity of 1.1 Ah, and detects the battery's SOH. The charge-discharge cut-off voltage range of the battery is 2.5 to 3.65V. The working environment of the battery is a constant temperature environment of 45°C. The current state of the battery is: under the working state of cyclic charging and discharging with a nominal capacity of 1C current constant current and constant voltage charging-shelving-discharging with a nominal capacity of 1C current constant current, it has been cyclically charged and discharged 50 times.

[0075] Step 1: Test the battery capacity C, and then place the battery until the voltage at both ends returns to a stable value. Place the battery in an environment of 25°C, charge it to 3.65V at a constant current of nominal capacity 1C, and then discharge it to 2.5V at a constant current of nominal capacity 1C, and recor...

Embodiment 2

[0086] Please refer to Figure 8-12 .

[0087] Example 2 provides a soft-pack type lithium iron phosphate / graphite power battery cell with a rated capacity of 1.1 Ah, and detects the battery's SOH. The charge-discharge cut-off voltage range of the battery is 2.5 to 3.65V. The battery was stored for one month under the conditions of 25°C and 20% SOC.

[0088] Step 1: Place the battery in a constant temperature environment of 25°C ± 1°C for 3 hours to balance the internal and external temperatures of the battery.

[0089] Step 2: Under a constant temperature environment of 25°C±1°C, discharge the battery with a nominal capacity of 1C current and constant current, discharge to the end of the discharge when the voltage across the battery is 2.5V, put the battery aside for 90 minutes, and then use the nominal capacity The battery is charged with a constant current of 1C, and the battery is charged with 10% SOC and left for 90 minutes. Take every 0.5s or ΔV as 5mV as the sampling stand...

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Abstract

The invention discloses a detection method of a battery health state. The method comprises the following steps: acquiring battery capacity C; charging or discharging a battery to cut-off voltage, idling, acquiring change of current and voltage of the battery during charge or discharge and during the idling to obtain V-t and I-t curves; performing nonlinear fitting on the V-t curve in a voltage stabilizing process in the obtained V-t curve by applying a model formula to obtain a fitting curve and acquiring a reference value; repeating the steps after the battery works for N1, N2, ..., Nm times circularly to obtain fitting curves and reference values of the V-t curves at different life stages of the battery; acquiring an index value for detecting the battery health state and a change tread of the index value after different cycles according to the reference value of the battery after different cycles. In addition, the invention also provides a diagnosis method for the battery health state and a diagnosis method for the battery charge and the health state.

Description

Technical field [0001] The invention relates to a method for detecting and diagnosing battery charge and battery health status. Background technique [0002] In recent years, lithium-ion batteries have been widely used in electronic products, new energy vehicles and other fields. However, long-term use of batteries will inevitably lead to aging and failure, which will affect the use of products to a certain extent. [0003] As a stable electrochemical system, the lithium ion battery has a cycle life of 1,000 to 3,000 times and a service life of 5 to 8 years. The state of charge (SOC, State of Charge, also known as the amount of charge) of the battery is an indicator used to describe the power contained in the battery. As the battery ages, the battery capacity gradually decreases. However, electric vehicles require a power supply life of more than 10 years, which requires us to monitor the deterioration of the battery in use, and to have a deep understanding of the restrictive fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 李宝华钱坤贺艳兵郑勇李懿洋杜鸿达康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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