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CN-121978558-A - Lithium battery short circuit detection device and detection method

CN121978558ACN 121978558 ACN121978558 ACN 121978558ACN-121978558-A

Abstract

The invention relates to the technical field of lithium battery detection, and discloses a lithium battery short circuit detection device and a detection method, wherein the detection device comprises a base and a water tank arranged in the base, a liftable platform is arranged in the water tank, insulating oil is filled in the water tank, and when the temperature of a lithium battery on the platform is abnormal, the lithium battery is led into the insulating oil in a descending manner to prevent spontaneous combustion of the lithium battery; and a detection circuit for connecting the anode and the cathode of the lithium battery is arranged on the base. The non-contact detection is carried out through the excitation of the rotating magnetic field, the battery shell is not required to be disassembled, physical damage to the battery is avoided, the mechanical impact is controllably applied through the impact spring, the impact strength and the angle can be accurately adjusted, the impact stress of the actual working condition is only simulated, the structure of the battery is not excessively damaged, the battery can still be used for the follow-up operation after the detection, the battery loss in the detection process is reduced, and the production cost of enterprises is reduced.

Inventors

  • XU MENG
  • YANG GAOYA
  • CHEN CHONGDA
  • LUO RUI

Assignees

  • 东莞市环宇源科技有限公司

Dates

Publication Date
20260505
Application Date
20260324

Claims (7)

  1. 1. The lithium battery short circuit detection device is characterized by comprising a base (1) and a water tank (2) arranged in the base (1), wherein a liftable platform (3) is arranged in the water tank (2), insulating oil is filled in the water tank (2), and when the temperature of a lithium battery on the platform (3) is abnormal, the lithium battery is led into the insulating oil in a descending way to prevent spontaneous combustion; a detection circuit (4) for connecting the anode and the cathode of the lithium battery is arranged on the base (1), the detection circuit (4) is connected with the anode and the cathode of the lithium battery, and the state of the lithium battery is monitored in real time; A shielding cabin (5) is arranged on the base (1), and a front end cover plate of the shielding cabin (5) is of a flip design, so that a lithium battery is led in and led out; an electromagnetic ejector (7) is arranged in the shielding cabin (5), the position and the angle of the electromagnetic ejector (7) are adjusted through a driving structure (8), so that the electromagnetic ejector (7) emits impact bullets to collide with a lithium battery, and the state of the lithium battery after collision is detected through a detection circuit (4); The shielding cabin (5) is internally provided with a magnetic field structure (6), and a rotating magnetic field is manufactured to penetrate through the shell of the lithium battery, so that eddy currents are induced in the conductor structure in the shielding cabin; the inside of shielding cabin (5) is equipped with a plurality of groups of infrared sensor that carries out temperature detection to the lithium cell, detects the change of temperature after the lithium cell striking in real time.
  2. 2. The lithium battery short circuit detection device according to claim 1, wherein the bottom of the platform (3) is lifted by a hydraulic device, holes for the penetration of insulating oil are formed in the surface of the platform (3), and after the platform (3) is immersed in the water tank (2), the insulating oil penetrates the lithium battery through the holes in the surface of the platform (3).
  3. 3. The lithium battery short circuit detection device according to claim 1, wherein the driving structure (8) comprises a frame (81) arranged at the top end of the inner side of the shielding cabin (5), an A-shaped module (82) and a B-shaped module (83) which are distributed vertically symmetrically are arranged on the frame (81), connecting frames (84) are arranged on Y-axis module sliding blocks of the A-shaped module (82) and the B-shaped module (83), spherical sleeves (85) are arranged on the connecting frames (84), rolling guide balls (86) are arranged in the spherical sleeves (85), holes for installing the electromagnetic ejectors (7) are formed in the guide balls (86), the electromagnetic ejectors (7) are fixed with the top of the electromagnetic ejectors (7) through the holes in the two guide balls (86), the bottoms of the electromagnetic ejectors (7) are slidably connected with the holes in the guide balls (86) below, and the electromagnetic ejectors (83) are integrally adjusted in the position of the electromagnetic ejectors (7) through the A-shaped module (82) and the B-shaped module (83).
  4. 4. The lithium battery short circuit detection device according to claim 1, wherein the magnetic field structure (6) comprises a supporting plate (61) arranged on the front, rear, left and right sides of the inner wall of the shielding cabin (5), an annular groove is formed in the supporting plate (61), exciting coils (62) are embedded in the annular groove of the supporting plate (61), the exciting coils (62) at the front, rear and left and right positions are divided into two groups, two paths of sine alternating currents with equal amplitude, same frequency and 90-degree phase difference are respectively and simultaneously fed into the two groups of exciting coils (62), and a uniform rotating magnetic field with magnetic force lines rotating at uniform speed in a plane perpendicular to the axes of the two coils is synthesized in the shielding cabin (5).
  5. 5. A lithium battery short-circuit detection device according to claim 4, wherein the two groups of excitation coils (62) are respectively arranged on opposite sides of the shielding cabin (5) so that the axes of the two groups of excitation coils (62) are orthogonal to form a rotating magnetic field.
  6. 6. The lithium battery short circuit detection device according to claim 4, wherein the outer side of the support plate (61) is provided with a protection plate (63) which is made of a non-magnetic, non-conductive and high-resistivity rigid material, so that the magnetic field penetrates without significant attenuation or distortion.
  7. 7. A method for detecting short circuit of a lithium battery, characterized in that the short circuit detection device for a lithium battery according to any one of claims 1to 6 is adopted, and the specific operation is as follows: s1, lifting the platform (3) to a detection position through a lifting bearing mechanism, placing a lithium battery on the platform (3), and connecting a detection circuit (4); s2, controlling an electromagnetic catapult (7) to adjust to a preset position and angle, and applying mechanical impact to the lithium battery; S3, after impact, generating a rotating magnetic field through a magnetic field structure (6) to excite the lithium battery, collecting surface time sequence temperature field images of the lithium battery by utilizing an infrared sensor, detecting temperature change, and identifying and positioning the internal damage position; And S4, if the abnormal temperature or electrical parameter is detected to exceed the safety threshold, immediately controlling the platform (3) to descend, and immersing the lithium battery in the insulating oil.

Description

Lithium battery short circuit detection device and detection method Technical Field The invention relates to the technical field of lithium battery detection, in particular to a lithium battery short circuit detection device and a lithium battery short circuit detection method. Background The lithium battery has been widely used in the fields of new energy automobiles, consumer electronics, energy storage devices, and the like by virtue of the advantages of high energy density, long cycle life, small environmental pollution, and the like. However, in the production, transportation and use processes of the lithium battery, hidden damages such as dislocation of an internal pole piece, diaphragm breakage, conductor structure breakage and the like are easily caused by mechanical stress such as collision and extrusion, and the damage initial stages are difficult to identify through appearance or simple electrical detection, but internal short circuit is caused in the subsequent charge and discharge processes, so that the temperature of the battery is rapidly increased, thermal runaway and spontaneous combustion explosion are caused, and personal and property safety is seriously threatened. Therefore, the internal damage and short circuit risk of the lithium battery (especially after mechanical impact) are accurately and comprehensively detected, and the method becomes a key link for guaranteeing the reliability and the use safety of the lithium battery product. The traditional detection technology focuses on the monitoring of electrical parameters (such as voltage and internal resistance) of a finished battery, can only identify the battery which has obvious short circuit, can not detect internal hidden damages formed after collision, such as pole piece microcracking and diaphragm local damage, has no abnormality in the initial electrical parameters of the hidden damages, but is easy to develop into short circuit in subsequent use, so that a detection result is disjointed from an actual safety state, and part of the technology tries to adopt single physical detection, but has high cost and complex operation of X-ray equipment, has limited resolution of ultrasonic detection on the internal conductor structure of the battery, and is difficult to accurately position the micro damage. Therefore, the invention provides a lithium battery short circuit detection device and a lithium battery short circuit detection method. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a lithium battery short circuit detection device and a lithium battery short circuit detection method. The invention provides a lithium battery short circuit detection device which comprises a base and a water tank arranged in the base, wherein a liftable platform is arranged in the water tank, insulating oil is filled in the water tank, and when the temperature of a lithium battery on the platform is abnormal, the lithium battery is led into the insulating oil in a descending way to prevent spontaneous combustion of the lithium battery; The base is provided with a detection circuit for connecting the anode and the cathode of the lithium battery, the detection circuit is connected with the anode and the cathode of the lithium battery, and the state of the lithium battery is monitored in real time; the base is provided with a shielding cabin, and a front end cover plate of the shielding cabin is in a flip design, so that the lithium battery is led in and led out; An electromagnetic ejector is arranged in the shielding cabin, the position and the angle of the electromagnetic ejector are adjusted through a driving structure, so that the electromagnetic ejector can emit impact bullets to collide with the lithium battery, and the state of the lithium battery after collision is detected through a detection circuit; when the inside of the battery is damaged, the eddy current distribution of a damaged area is distorted, so that abnormal local temperature rise is generated in the area; The inside of shielding cabin is equipped with a plurality of groups of infrared sensor that carries out temperature detection to the lithium cell, detects the change of temperature after the lithium cell striking in real time. Preferably, the bottom of the platform is lifted through a hydraulic device, and holes for the penetration of insulating oil are formed in the surface of the platform, so that after the platform is immersed in a water tank, the insulating oil penetrates the lithium battery through the holes in the surface of the platform. Preferably, the driving structure comprises a frame arranged at the top end of the inner side of the shielding cabin, an A-type module and a B-type module which are vertically symmetrically distributed are arranged on the frame, connecting frames are arranged on Y-axis module sliding blocks of the A-type module and the B-type module, spherical sleeves are arranged on the connecting frames, rolling guid