Device for detecting conductivity of connection position of battery module and detection method of device

Abstract

The invention discloses a device for detecting conductivity of the connection position of a battery module and a detection method of the device. The device comprises a tester, a computer host and a display, wherein an output end of the tester is electrically connected with an input end of the computer host, an output end of the computer host is electrically connected with an input end of the display, a resistance test meter and a current test meter are embedded in the middle of the tester, the tester is connected with positive test electrodes and negative test electrodes through wires rotationally connected to wiring knobs, and one end of each of the positive test electrodes and the negative test electrodes is connected to a parent material. The device can determine connection conductivityof battery modules and cannot damage welding points, so that the purpose of nondestructive detection is achieved; whether the conductivity of the connection position is good is determined by comparing the difference between the change degree (namely, the slope of a linear straight line) of resistance value of a workpiece under different currents and the standard value, and influences of workpiecetemperature and other factors on measured data are greatly eliminated.

Description

technical field [0001] The technical field of electronic detection of the present invention, in particular, relates to a detection device and a detection method for the continuity of a battery module group connection. Background technique [0002] At present, due to its excellent performance, lithium-ion batteries are widely used in electric vehicles, backup power supplies, mobile digital and other fields. For example, in the field of electric vehicles, a battery module is formed by connecting multiple single cells in series or in parallel, and several battery modules are connected in series or in parallel with each other to form a battery pack. [0003] In the connection technology of the battery module group, metal wire ultrasonic welding, resistance spot welding and laser welding are widely used. For example, the use of aluminum wire ultrasonic welding technology can allow current within the range to pass through, and when a short circuit occurs and overcurrent occurs, i...

AI Technical Summary

Problems solved by technology

There are two disadvantages in this method: 1. The efficiency is not high: it takes a long time to slowly increase the tensile test for each aluminum wire

2. It is easy to damage the welding materials: applying tension to the solder joints after welding can easily deform the aluminum wire and its connected materials

However, this method will have the following problems when used in the continuity detection of battery module groups: 1) Constant temperature treatment is difficult to achieve: the ambient temperature will change from time to time in actual production, and at the same time, the temperature of the workpiece will also increase as the power-on process proceeds , the change of temperature will also affect the change of current, so it is necessary to keep the temperature of the workpiece constant, the process is troublesome, and the efficiency is affected

2) The contact resistance error has a great influence: the electrode needle is in contact with the component, and since the surface metal oxide film, chloride, sulfide and various organic molecules, adsorbed gas and other pollutants can be formed on the contact surface, these films play a role The role of the insulator, resulting in contact resistance

The contact resistance is sensitive to current and voltage, resulting in measurement errors; the electrical parameters of tiny electronic components are extremely small, and the electrical parameters at the connection are directly measured, and the resulting extremely small errors will greatly affect the judgment of the final result

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