A batch detection method for sodium-sulfur batteries

Abstract

The invention discloses a mass detection method of sodium-sulfur batteries. The mass detection method includes the steps of connection, heating, charging and discharging, positioning, judging and classification. In the connection step, the sodium-sulfur batteries to be detected in a thermal insulation box are connected to form a detection loop. In the heating step, the detection loop is heated to the working temperature of the sodium-sulfur batteries to be detected. In the charging and discharging step, four times of discharging and charging circulation are conducted on the detection loop, and real-time voltages and real-time capacity of all the sodium-sulfur batteries to be detected in the detection loop are measured. In the positioning step, an abnormal temperature measuring point with the temperature higher than the upper limit of the working temperature of the sodium-sulfur batteries to be detected is found out in the thermal insulation box. In the judging step, the damaged sodium-sulfur battery is found out according to the rear-time voltages of the four sodium-sulfur batteries to be detected around the abnormal temperature measuring point, and the damaged sodium-sulfur battery to be detected is isolated from the detection loop. In the classification step, the sodium-sulfur batteries are classified according to the capacity, and the classified sodium-sulfur batteries are isolated from the detection loop.

Description

technical field [0001] The invention relates to a batch detection method for sodium-sulfur batteries in the field of chemical energy storage. Background technique [0002] Batch detection of sodium-sulfur batteries is a method to judge the performance of sodium-sulfur batteries by charging and discharging the majority of sodium-sulfur batteries to be tested. Compared with single sodium-sulfur detection, although the efficiency is greatly improved, the biggest problem it brings The same batch of sodium-sulfur batteries participating in the test needs to be completed under the same test conditions. However, in fact, some unavoidable differences in the preparation process of sodium-sulfur batteries have caused differences in the performance of sodium-sulfur batteries. All sodium-sulfur batteries participating in the test It is impossible to complete under exactly the same conditions from beginning to end. For example, some sodium-sulfur batteries exceed the voltage range specif...

AI Technical Summary

Problems solved by technology

[0002] Batch detection of sodium-sulfur batteries is a method to judge the performance of sodium-sulfur batteries by charging and discharging the majority of sodium-sulfur batteries to be tested. Compared with single sodium-sulfur detection, although the efficiency is greatly improved, the biggest problem it brings The same batch of sodium-sulfur batteries participating in the test needs to be completed under the same test conditions. However, in fact, some unavoidable differences in the preparation process of sodium-sulfur batteries have caused differences in the performance of sodium-sulfur batteries. All sodium-sulfur batteries participating in the test It is impossible to complete under exactly the same conditions from beginning to end. For example, some sodium-sulfur batteries exceed the voltage range specified in practical applications after charging and discharging with a certain capacity, while other batteries can continue to be tested.

At the same time, a relatively large number of batteries are tested together, and it is difficult to avoid a small number of sodium-sulfur batteries to fail, which may cause local temperature rise. How to solve the impact of local temperature rise on the overall test is also the focus of batch testing. question

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