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Method for detecting pseudo soldering of 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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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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  • Method for detecting pseudo soldering of power battery module
  • Method for detecting pseudo soldering of power battery module

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Embodiment 1

[0027] Please refer to figure 1 As shown, the present invention discloses a method for detecting false welding of a power battery module, which specifically includes the following steps:

[0028] 1) Select two 8P modules that obviously have virtual solder joints through visual observation and stress inspection; number the solder joints 3; design a circular through hole 4 with an inner diameter greater than 1mm at each soldering position of the bus bar 1, and pass through The position of the hole 4 is within the contact range between the bus bar 1 and the battery pole; the material of the bus bar 1 is aluminum;

[0029] 2) Weld the bus bar 1 and the pole using laser welding to make a module;

[0030] 3) Use an internal resistance tester to perform a resistance test after welding. The internal resistance tester meets the resolution NDC>5 and accuracy requirements %GRR<10% of the measurement system. During the test, the probe 2 at one end is lapped on the welding point 3, and t...

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Abstract

The invention discloses a method for detecting pseudo soldering of a power battery module, which comprises the following steps of: firstly, testing the resistance values of the upper surface of a welded bus-bar and the pole surface of a battery, and judging whether pseudo soldering exists or not according to the resistance values of a welding point and the pole surface. According to the detectionmethod, 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; and the problem that 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.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for detecting false welding of a power battery module. 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 the protec...

Claims

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Application Information

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