Search

CN-121977760-A - Battery pack air tightness detection device and method

CN121977760ACN 121977760 ACN121977760 ACN 121977760ACN-121977760-A

Abstract

The invention provides a device and a method for detecting tightness of a battery pack, belongs to the technical field of battery pack detection, and solves the technical problem that the existing detection technology cannot accurately position a leakage point. The device comprises a shell, an inner conveying mechanism and a detecting mechanism, wherein the shell is provided with an opening and closing door and a suction mechanism, the inner conveying mechanism comprises a front conveyor and a rear conveyor which are arranged at intervals, the detecting mechanism is arranged between the front conveyor and the rear conveyor and comprises an annular seat, a sliding seat, a rotating seat, a telescopic seat and a rotating rod, a battery pack conveying path is arranged inside the annular seat, the sliding seat slides along the circumference of the annular seat, the rotating seat is rotationally arranged on the sliding seat, a gas detecting sensor is circumferentially arranged at the end part of the rotating seat in an array manner, the telescopic seat is telescopically connected with the rotating seat, the rotating rod is rotationally arranged on the telescopic seat, and a marking pen is arranged at the end part of the rotating rod. The sensor is used for scanning and detecting the surface of the battery pack through the multi-degree-of-freedom driving mechanism, the concentration gradient method is used for accurately positioning the leakage point and the leakage point is automatically marked by the marking pen, and accurate tracing analysis of the leakage point is realized.

Inventors

  • BAI QINGHUA
  • SHU TIE
  • TIAN XIANGJUN
  • WANG JIANYAN
  • ZHANG DONGXU
  • LIU ZHIHAN

Assignees

  • 招商局检测车辆技术研究院有限公司

Dates

Publication Date
20260505
Application Date
20260320

Claims (10)

  1. 1.A battery pack tightness detection device is characterized in that: comprises a shell (1), an inner conveying mechanism and a detecting mechanism (5); the shell (1) is provided with an opening and closing door (11) for the battery pack to enter and exit and a suction mechanism (12) for vacuumizing the shell (1); the inner conveying mechanism comprises a front conveyor (2) and a rear conveyor (3) which are arranged in the shell (1) at intervals; The detection mechanism (5) is arranged between the front conveyor (2) and the rear conveyor (3) and comprises an annular seat (51), a sliding seat (52), a rotating seat (53), a telescopic seat (54) and a rotating rod (55), wherein the annular seat (51) is fixed and is internally provided with a conveying path of a battery pack, the sliding seat (52) is arranged in a sliding manner along the circumferential direction of the annular seat (51) and the sliding position is regulated by a first driving mechanism (56), the rotating seat (53) is rotationally arranged on the sliding seat (52) and the axis of rotation is parallel to the axis of the annular seat (51), the rotating angle of the rotating seat (53) is regulated by a second driving mechanism (57), a gas detection sensor (6) is circumferentially arranged at the end part of the rotating seat (53) facing the central end of the annular seat (51), the telescopic seat (54) is telescopically connected with the rotating seat (53) and the telescopic direction faces the center of the annular seat (51), the telescopic amount of the telescopic seat (54) is regulated by a third driving mechanism (58), the rotating seat (55) is rotationally arranged on the rotating seat (55) and the rotating rod (55) and the telescopic seat (55) is axially parallel to the rotating rod (55), one end of the rotary rod (55) facing the center of the annular seat (51) is provided with a marker pen (7).
  2. 2. The battery pack airtightness detection apparatus according to claim 1, further comprising an outer conveying mechanism (4), wherein the outer conveying mechanism (4) is disposed outside the housing (1) and is located at a position corresponding to the opening/closing door (11), and the outer conveying mechanism (4) and the inner conveying mechanism are located at positions corresponding to each other and are capable of conveying the battery packs to each other.
  3. 3. A battery pack air tightness detection device according to claim 1, wherein said first driving mechanism (56) comprises: A gear ring (561) provided on the circumference of the annular seat (51); a first power source (562) fixedly arranged on the sliding seat (52); and a gear (563) fixedly provided on the output shaft of the first power source (562) and engaged with the ring gear (561).
  4. 4. A battery pack air tightness detection device according to claim 1, wherein said second driving mechanism (57) comprises: A first belt pulley (571) fixedly arranged on the rotating seat (53), wherein the wheel axle of the first belt pulley (571) is overlapped with the hinge shafts of the rotating seat (53) and the sliding seat (52); A second power source (572) fixedly provided to the slide seat (52); and a conveyor belt (573) connected to the second power source (572) and the first pulley (571).
  5. 5. A battery pack air tightness detection device according to claim 1, wherein said third driving mechanism (58) comprises: A third power source (581) fixedly arranged on the rotating seat (53); -a screw (582) driven by the third power source (581), the screw (582) being in threaded engagement with the telescopic seat (54).
  6. 6. A battery pack air tightness detection device according to claim 1, wherein said fourth driving mechanism (59) comprises: A fourth power source (591) provided in the rotating base (53); The outer periphery is in running fit with the rotating seat (53), the inner periphery is in axial sliding fit with the rotating rod (55) and is in circumferential relative fixed with a second belt wheel (592), and the second belt wheel (592) is in transmission connection with the fourth power source (591).
  7. 7. The battery pack airtightness detection apparatus according to claim 6, wherein the engagement interface of the second pulley (592) and the rotating lever (55) is provided with an engagement structure (551) axially parallel to the rotating lever (55).
  8. 8. A battery pack airtightness detection apparatus according to claim 1, wherein one end of the telescopic seat (54) facing the center of the annular seat (51) is annular, and the rotating rod (55) is located at the center of the annular seat.
  9. 9. The battery pack airtightness detection apparatus according to claim 8, wherein the marker pen (7) is eccentrically provided at an end of the rotating rod (55) toward the center of the annular seat (51).
  10. 10. A battery pack air tightness detection method, characterized in that a battery pack air tightness detection device according to any of claims 1-9 is employed, comprising the steps of: The battery pack to be tested is driven by the front conveyor (2) and the rear conveyor (3) and moves forward step by step; The first driving mechanism (56) adjusts the position of the sliding seat (52) on the annular seat (51) to correspond to the lateral directions of the battery pack; the second driving mechanism (57) adjusts the angle of the rotating seat (53) on the sliding seat (52) to be vertical to the surface of the battery pack; The rotating seat (53) is fully opened towards one end of the center of the annular seat (51) for detection of the gas detection sensors (6), and moves according to the numerical deviation of each gas detection sensor (6) until the numerical values of each gas detection sensor (6) tend to be consistent, and at the moment, a leakage point is positioned in the center area of each gas detection sensor (6); The third driving mechanism (58) is used for adjusting the telescopic seat (54) to abut against the battery pack, after the marker pen (7) is in contact with the battery pack, the fourth driving mechanism (59) is used for controlling the rotary rod (55) to rotate, and the marker pen (7) is used for encircling a leakage area.

Description

Battery pack air tightness detection device and method Technical Field The invention relates to the technical field of battery pack detection, in particular to a device and a method for detecting tightness of a battery pack. Background With the rapid development of the new energy automobile industry, the battery pack is taken as a core power component, and the safety and the reliability of the battery pack are paid attention to. The air tightness detection is a key link in the production and quality control processes of the battery pack, and aims to ensure that the battery pack shell has good sealing performance so as to prevent external moisture, dust and other impurities from invading and avoid potential safety hazards caused by leakage of internal electrolyte. Currently, airtight detection technologies such as a differential pressure method and a flow method are commonly adopted in the industry, and whether the overall sealing performance meets a preset standard is judged by inflating the inside of a battery pack and monitoring pressure change or gas flow. However, existing detection methods generally only output qualitative conclusions of "pass" or "leak". When the battery pack is determined to be leaking, the detection system cannot provide specific location information of the leak. The follow-up leakage checking work is seriously dependent on manual experience, quality inspection staff is required to conduct large-scale screening on the battery shell body one by one in modes of smearing soapy water, observing bubbles and the like, and the process is tedious and time-consuming. Because the leakage points cannot be accurately positioned, maintenance personnel often need to spend a large amount of time to check, so that the production efficiency is reduced, and part of tiny or hidden leakage points are easy to miss, so that the reliability of the manufactured products is affected. Meanwhile, the lack of accurate leakage position data is also unfavorable for the production enterprises to carry out targeted analysis and improvement on upstream process links such as welding, sealing and the like. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a device and a method for detecting the tightness of a battery pack, which are used for solving the technical problem that the prior detection technology can only provide qualitative results of 'qualification' or 'leakage', but cannot accurately locate specific leakage points. The invention adopts the technical scheme that the device and the method for detecting the tightness of the battery pack are provided. The battery pack air tightness detection device comprises a shell, an inner conveying mechanism and a detection mechanism; The shell is provided with an opening and closing door for the battery pack to enter and exit and a suction mechanism for vacuumizing the shell; the inner conveying mechanism comprises a front conveyor and a rear conveyor which are arranged in the shell at intervals; the detection mechanism is arranged between the front conveyor and the rear conveyor and comprises an annular seat, a sliding seat, a rotating seat, a telescopic seat and a rotating rod, wherein the annular seat is fixed and is internally provided with a conveying path of a battery pack, the sliding seat is arranged in a sliding mode in the circumferential direction of the annular seat and is adjusted by a first driving mechanism in a sliding position, the rotating seat is rotated and arranged in the sliding seat, a rotating axis is parallel to the axis of the annular seat, the rotating angle of the rotating seat is adjusted by a second driving mechanism, a gas detection sensor is arranged at the end part of the rotating seat, which faces the center end of the annular seat, of the rotating seat in a circumferential array mode, the telescopic seat is connected with the rotating seat in a telescopic mode, the telescopic direction faces the center of the annular seat, the telescopic amount of the telescopic seat is adjusted by a third driving mechanism, the rotating rod is rotated and is arranged in the telescopic seat in a parallel to the telescopic direction of the telescopic seat in an axial direction of the telescopic seat, the rotating rod is adjusted by a fourth driving mechanism, and the rotating rod is provided with a mark towards the center end of the annular seat. Optionally, the battery pack opening and closing device further comprises an outer conveying mechanism, wherein the outer conveying mechanism is arranged on the outer side of the shell, the position of the outer conveying mechanism corresponds to that of the opening and closing door, and the outer conveying mechanism corresponds to that of the inner conveying mechanism and can mutually convey the battery pack. Optionally, the first driving mechanism comprises a gear ring arranged on the circumference of the annular seat, a first power source fixedly arranged on the