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Method for detecting pseudo soldering of lithium ion power battery module

A power battery and detection method technology, which is applied in the direction of electrical connection testing, measuring electricity, measuring devices, etc., can solve the problems of affecting accuracy, difficult charging and discharging at high rates, and unrecognizable problems

Pending Publication Date: 2020-10-23
ETRUST POWER ETP GRP LTD
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AI Technical Summary

Problems solved by technology

[0006] On the one hand, for high-capacity battery packs, it is difficult to achieve high-rate charge and discharge, and there are certain safety issues; on the other hand, for the separation of bus bars and poles, it is impossible to identify them by observing the temperature level of solder joints; will affect the accuracy of detection

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] The invention discloses a method for detecting false welding of a lithium-ion power battery module, which specifically includes the following steps:

[0027] 1) Select 30pcs lithium iron phosphate 40Ah 8P modules and number them, among which 2#, 6#, 18#, 22#, 27# modules obviously have virtual solder joints through visual observation and stress inspection;

[0028] The initial SOC state of the module used is 2.5%, and the initial voltage of the module is recorded;

[0029] 2) Charge the modules to 8% SOC with a current of 160A, record the charging end voltage, and calculate the charging voltage rise value △V of each module; obtain a set of sample voltage difference data that obey the normal distribution, as shown in Table 1 Show;

[0030] 3) From the voltage difference results in Table 1, it can be seen that the rising value of the charging voltage of 2#, 6#, 18#, 22#, and 27# is obviously higher than that of other solder joints;

[0031] 4) According to the average v...

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PUM

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Abstract

The invention discloses a method for detecting pseudo soldering of a lithium ion power battery module. The method comprises the steps of carrying out the fixed-time charging of a module in a low SOC state according to a certain rate, and judging whether the module is subjected to pseudo soldering or not through a voltage rising value. According to the detection method, the detection accuracy is effectively improved, and the problem that in the prior art, the accuracy of inspection such as inspection with external force or inspection through naked eye observation is poor is solved; the problemthat in the prior art, a high-capacity module can be hardly charged and discharged at a high rate is solved, and whether pseudo soldering happens to a module welding point or not can be comprehensively and accurately checked; and the operation is simple and feasible, the cost is low, and the module is not damaged.

Description

technical field [0001] The invention relates to the technical field of power battery modules, in particular to a method for detecting false welding of lithium-ion power battery modules. Background technique [0002] Due to the advantages of high energy density, long cycle life and no memory effect, lithium-ion power batteries are widely used in the fields of new energy vehicles and energy storage. [0003] Power battery manufacturing includes two important production processes of battery cell and PACK. In battery PACK, laser welding is generally used to weld the battery poles and bus bars to realize the series and parallel connection of single batteries. Due to the influence of various factors, false welding may occur during welding. On the one hand, the weak welding makes the capacity of the battery pack insufficient and local heating is severe; on the other hand, the weak welding module will produce abnormal voltage differences during charging and discharging, triggering...

Claims

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Application Information

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IPC IPC(8): G01R31/66G01R31/54G01R31/385
CPCG01R31/66G01R31/54G01R31/385
Inventor 陈卓王亚超王晶
Owner ETRUST POWER ETP GRP LTD
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