Device for detecting pseudo soldering of power battery module and detection method thereof

Abstract

The invention discloses a device for detecting pseudo soldering of a power battery module and a detection method thereof, and belongs to the technical field of battery module quality detection. A plurality of battery cells are connected in series, and a plurality of detection units are arranged, so that the resistances at the welding parts of the battery cells and connecting assemblies can be measured simultaneously, and the device is particularly suitable for measurement by methods such as a four-end method. Meanwhile, the plurality of battery cells are connected in series through the plurality of connecting assemblies and adapt to the use working conditions, and compared with a measurement mode only for the welding position of one battery cell and one connecting assembly, the method hasthe advantages of stable current and voltage during measurement and more accurate measurement numerical value.

Description

technical field [0001] The invention relates to the field of detection of battery modules, in particular to a device and method for detection of virtual welding of power battery modules. Background technique [0002] With the development of vehicles such as new energy vehicles and electric bicycles, power batteries have been widely used. In order to achieve the required voltage or current, it is necessary to use connecting components to weld the cells of the power battery in series or in parallel to form a power battery pack with high energy density and long life. However, due to factors such as the presence of foreign objects or process parameters when welding the poles of the battery cells and the connection components, there will be a problem of virtual welding between the poles of the power cells and the connection components during the welding process. [0003] In the prior art, in order to detect virtual welding, the following technical means are included: [0004] (...

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Problems solved by technology

[0008] (1) Pulling the battery pack by external force may cause the welding strength of the connecting components and the battery cell to weaken;

[0009] (2) When thicker connection components are used, CCD scanning cannot scan to determine whether there is a virtual weld through the appearance;

[0010] (3) The data collected by the single cell voltage on the EOL equipment includes the DC internal resistance of the cell itself (the inconsistency of the instantaneous current and voltage rise and fall rate of the single cell will cause deviations in its data judgment), and the consistency of the slave control board manufacturing Sexuality, EMC interference, etc. will affect the accuracy of single voltage acquisition, thereby affecting the accuracy of DC internal resistance, thereby reducing the repeatability and confidence of test values

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