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CN-121977761-A - Detection device for battery shell production

CN121977761ACN 121977761 ACN121977761 ACN 121977761ACN-121977761-A

Abstract

The invention relates to a detection device for battery shell production, which comprises a base and an upper cover plate which is arranged above the base in a driving manner through a driving mechanism, wherein an extrusion mechanism for extruding a battery shell is arranged at the bottom of the upper cover plate, and a positioning mechanism for positioning the battery shell is arranged at the top of the base. When the detection device for producing the battery shell is pressed down, firstly, gas in the pressed main air bag can be pressed into all surrounding side air bags to expand the side air bags, so that the secondary wrapping and flexible pressurizing sealing of the air bags on the edge of the battery shell are realized on the basis of the primary positioning of the rigid frame. The dual sealing mode of rigid positioning and flexible filling effectively compensates for workpiece size slight differences and surface irregularities, ensures sealing uniformity and reliability, and greatly reduces leakage false alarm rate.

Inventors

  • WANG ZHENWEI
  • CHE KUN

Assignees

  • 安徽强旭塑业科技有限公司

Dates

Publication Date
20260505
Application Date
20251211

Claims (5)

  1. 1. The detection device for the production of the battery shell comprises a base (1) and an upper cover plate (2) which is arranged above the base (1) in a driving manner through a driving mechanism, and is characterized in that an extrusion mechanism for extruding the battery shell is arranged at the bottom of the upper cover plate (2), and a positioning mechanism for positioning the battery shell is arranged at the top of the base (1); The extrusion mechanism comprises a fixed plate (8) fixed on an upper cover plate (2) and a double-rod driving air cylinder (14) which is arranged on the upper cover plate (2) in a sliding manner through air cylinder driving, and further comprises two side sliding plates (9) which are connected with one side of the fixed plate (8) in a sliding manner, connecting frames (12) are fixedly connected to two ends of a piston rod of the double-rod driving air cylinder (14), one side, opposite to the two connecting frames (12), of the two connecting frames is assembled to form a finished rectangle through steps, two opposite sides of the connecting frames (12) are respectively connected with one side of the two side sliding plates (9) in a sliding manner, one side, extruded by the fixed plate (8) and a battery shell, of the side sliding plates (9) is respectively coated with a side air bag (13), and the side air bag (10) and the side air bag (13) are communicated through a communication pipeline (11).
  2. 2. The detection device for producing the battery shell according to claim 1, wherein the positioning mechanism comprises a moving groove (2) formed in the inner cavity of the base (1), and the inner cavity of the moving groove (2) is connected with a moving plate (3) for placing the battery shell in a sliding manner.
  3. 3. The detection device for producing the battery shell according to claim 1, wherein the inner cavity of the moving plate (3) is provided with an embedded groove (5), the inner cavity of the embedded groove (5) is driven by a driving cylinder (7) to be provided with a telescopic cylinder (6) which is connected with the embedded groove (5) in a sliding way, and when the telescopic cylinder (6) is retracted, the top end of the telescopic cylinder is positioned in the inner cavity of the embedded groove (5).
  4. 4. The detecting device for battery case production according to claim 3, wherein the embedded grooves (5) are provided with three, and are respectively distributed along three right-angle directions on the surface of the moving plate (3).
  5. 5. The detection device for producing the battery shell according to claim 1, wherein an air hole (4) communicated with an external air pump is formed in the center of the movable plate (3), and a plurality of unevenly distributed air pressure detection points are formed on the surface of the movable plate (3).

Description

Detection device for battery shell production Technical Field The invention relates to the technical field of battery shell production, in particular to a detection device for battery shell production. Background In the field of lithium battery manufacturing, the sealing integrity of a battery case (usually an aluminum plastic film or a metal case) is a core index for guaranteeing the safety and service life of a battery. Therefore, after the production is completed, the battery case must be subjected to strict air tightness detection. In the conventional detection method, a rigid sealing mold with a fixed size is mostly adopted, and detection gas (such as helium or air) is filled into a sealing cavity, and air pressure change is observed or a leak detector is used for judging whether leakage exists. However, such methods have significant limitations, firstly, in that the rigid mold is usually designed for a single size battery case, when the product model is changed, the entire mold needs to be replaced, the flexibility is poor and the cost is high, secondly, the rigid sealing surface is in line contact or small-area contact with the edge (skirt) of the battery case, local deformation or poor sealing is easily generated under pressure, so that the product is misjudged or damaged, and furthermore, the battery case may have slight inclination or position deviation when placed at the detection station, so that the uniformity of sealing and the accuracy of detection results are affected. While attempts have been made in the prior art to use flexible sealing rings, they have limited flexibility and difficulty in quickly and accurately adjusting the sealing boundary when inspecting different sized products. Therefore, there is an urgent need in the art for an integrated air tightness detection device that can quickly adapt to various battery case sizes, achieve uniform and reliable sealing, and have an automatic positioning and correcting function, so as to improve detection efficiency, accuracy and equipment universality. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a detection device for battery shell production, and solves the problems. The detection device for producing the battery shell comprises a base and an upper cover plate which is arranged above the base in a driving mode through a driving mechanism in a sliding mode, wherein an extrusion mechanism for extruding the battery shell is arranged at the bottom of the upper cover plate, and a positioning mechanism for positioning the battery shell is arranged at the top of the base; The extrusion mechanism comprises a fixed plate fixed on the upper cover plate, a double-rod driving air cylinder which is arranged on the upper cover plate in a sliding way through an air cylinder driving way, and two side sliding plates which are connected with one side of the fixed plate in a sliding way, wherein both ends of a piston rod of the double-rod driving air cylinder are fixedly connected with connecting frames, one side opposite to the two connecting frames is assembled through steps to form a finished rectangle, one side opposite to the two connecting frames is respectively connected with one side of the two side sliding plates in a sliding way, one side of the fixed plate, which is extruded by a battery shell, is fixedly provided with a main air bag, one side, extruded by the connecting frames, of the side sliding plates and the battery shell, is respectively coated with a side air bag, the main air bag and the side air bag are communicated through a communicating pipe, after the battery shell is produced, the air tightness is required to be detected, the size of the battery shell is measured, the distance required to be moved by the three driving air cylinders is calculated, and the extrusion mechanism is adjusted, the size of the battery shell can be adapted, the side skirt edge of the battery shell is pressed, the distance between the movable adjusting plate and the fixed plate corresponds to the length of the battery shell, then the parallel bar driving cylinder drives the two connecting frames to move to adjust the distance between the two side sliding plates to correspond to the width of the battery shell, after the adjustment is finished, the battery shell is reversely buckled above the movable plate, the telescopic cylinder is started to extend out, then the telescopic cylinder is retracted through the driving cylinder to move towards the center far away from the movable plate, the three telescopic cylinders apply tensile force to the battery shell to automatically correct the battery shell, the battery shell is horizontally placed on the movable plate and is just positioned below the extrusion mechanism, the upper cover plate descends to drive the fixed plate, the side sliding plates and the connecting frames to move and extrude the skirt edge of the battery shell, at the moment, the main air bag is extruded, and