CN216914810U

CN216914810U - Fold flattening device of lithium battery diaphragm

Info

Publication number: CN216914810U
Application number: CN202220407573.6U
Authority: CN
Inventors: 马颖华; 汪品; 夏伦鹏; 王义飞
Original assignee: Gotion High Tech Co Ltd
Current assignee: Gotion High Tech Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-07-08
Anticipated expiration: 2032-02-25

Abstract

The utility model discloses a wrinkle flattening device for a lithium battery diaphragm, which comprises two linear guide rails, two mounting substrates, a cache flattening roller and an electrostatic rope, wherein the two linear guide rails are parallel to each other, a space is reserved between the two linear guide rails, the two mounting substrates are respectively connected onto the corresponding linear guide rails in a sliding manner, two ends of a rotating shaft of the cache flattening roller are respectively connected onto the two mounting substrates in a rotating manner, the electrostatic rope is connected between the two mounting substrates, the diameter of the middle of the cache flattening roller gradually decreases towards the two ends, and the roller surface of the cache flattening roller is provided with convex grains. The utility model has two functions of removing static electricity and wrinkles of the diaphragm, is simple and convenient to install, does not need a power supply or other power and has high safety performance.

Description

Fold flattening device of lithium battery diaphragm

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a wrinkle flattening device for a lithium battery diaphragm.

Background

The lithium battery mainly comprises an anode, a cathode, a diaphragm, electrolyte and the like. The diaphragm is mainly used for isolating the positive electrode from the negative electrode plate, preventing the battery from short circuit and providing an ion channel. When the diaphragm passes through the lamination machine roller, the roller of lamination machine generally has no line, promotes and the diaphragm width broad when lamination machine functioning speed, and the diaphragm is not fully unfolded and just is folded into the electric core, leads to electric core inside to appear raised grain or dead fold. After the lithium ions at the position corresponding to the dead fold are extracted from the positive electrode, the lithium ions cannot be uniformly inserted into the negative electrode, so that the negative electrode at the corresponding position can be brown with insufficient lithium insertion or striped lithium deposition in the same direction as the wrinkling direction of the diaphragm, and the lithium deposition is one of main factors influencing the quality of the finished product.

At present, static electricity is also a major factor that plagues the membrane wrinkling. When the static electricity is large, the separator adheres to the roller by static electricity, the separator fails to stretch and is folded into the electric core, and in addition, the static electricity endangers the safety of equipment and personnel. At present, the static electricity of the diaphragm is eliminated by the laminating machine mainly by adopting a de-ionized air device, but the static electricity of a certain roller passing position can be effectively eliminated by the de-ionized air device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fold flattening device for a lithium battery diaphragm, which can quickly flatten folds of the diaphragm before diaphragm lamination, and ensure the quality of a lithium battery finished product.

The technical scheme of the utility model is as follows:

the utility model provides a fold exhibition paper-back edition of lithium cell diaphragm is put, is including two linear guide, two mounting substrate and buffer nip roll, and two linear guide are parallel to each other and leave the interval between, and two mounting substrate difference sliding connection are on the linear guide who corresponds, and the both ends of buffer nip roll pivot rotate respectively to be connected on two mounting substrate, and the centre of buffer nip roll diminishes to the diameter at both ends gradually, is provided with convex line on the roll surface of buffer nip roll.

The roll surface of buffer memory nip roll on be provided with many convex chevron shape lines, many chevron shape lines are parallel to each other, the both ends of every chevron shape line extend to the both ends of buffer memory nip roll respectively.

Two mounting substrate between be connected with the static rope, one of static rope is served and is connected with the earth connection, the static rope is adjacent to the axis of buffer memory nip roll and be on a parallel with buffer memory nip roll.

The two mounting substrates are fixedly connected with copper noses, and two ends of the static rope are respectively connected with the copper noses on the two mounting substrates.

The distance between the static rope and the buffer flattening roller is 5-10 mm.

The static rope is a conductive polymer fiber rope.

The utility model has the advantages that:

(1) the buffer flattening roller is arranged and translates along the two linear guide rails, so that the buffer flattening roller is in contact with the diaphragm and slightly stretches the diaphragm, and the effect of buffering the diaphragm is achieved;

(2) the middle of the buffer flattening roller is thick, the two sides of the buffer flattening roller are thin, so that the diaphragm begins to extend from the middle to the two sides, the tension difference between the middle and the two sides is reduced, the diaphragm tends to be in a flattened state, the herringbone line ((the depth of the herringbone line can be selected according to the thickness of the diaphragm)) is favorable for the unfolding of the diaphragm in the operation process, and the problem that the wavy lines or the dead folds occur in the battery cell is greatly reduced under the condition of accelerating the lamination rate;

(3) the anti-static diaphragm is provided with the static rope, the static rope is convenient to install, occupies a small space and can well eliminate static electricity of the diaphragm, the static rope is grounded through the grounding wire, static electricity is led into the ground and is not electrified, and the purposes of electric conduction and explosion prevention are achieved.

The utility model has two functions of eliminating static electricity of the diaphragm and eliminating wrinkles of the diaphragm, is simple and convenient to install, does not need a power supply or other power and has high safety performance.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Reference numerals: the method comprises the following steps of 1-linear guide rail, 2-mounting base plate, 3-cache flattening roller, 4-static rope, 5-herringbone line, 6-copper nose and 7-grounding wire.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a wrinkle flattening device for a lithium battery diaphragm comprises two linear guide rails 1, two mounting substrates 2, a cache flattening roller 3 and an electrostatic rope 4 (conductive polymer fiber rope), wherein the two linear guide rails 1 are parallel to each other with a space left therebetween, the two mounting substrates 2 are respectively connected to the corresponding linear guide rails 1 in a sliding manner, two ends of a rotating shaft of the cache flattening roller 3 are respectively connected to the two mounting substrates 2 in a rotating manner, the diameter of the middle of the cache flattening roller 3 gradually decreases towards two ends, a plurality of convex herringbone lines 5 are arranged on the roller surface of the cache flattening roller 3, the plurality of herringbone lines 5 are parallel to each other, two ends of each herringbone line 5 respectively extend towards two ends of the cache flattening roller 3, copper noses 6 are fixedly connected to the two mounting substrates 2, and two ends of the electrostatic rope 4 are respectively connected to the copper noses 6 on the two mounting substrates 2, the static rope 4 is parallel to the axis of the buffer flattening roller 3, the distance between the static rope 4 and the buffer flattening roller 3 is 5-10mm, one end of the static rope 4 is connected with a grounding wire 7, the length of the grounding wire 7 is determined according to the distance of the static rope 4 moving along with the translation of the mounting substrate 2, and the phenomenon that the distance is unmatched and the breakage occurs is prevented.

When the device is used, the buffer flattening rollers 3 move horizontally along the two linear guide rails 1, so that the buffer flattening rollers 3 are in contact with the diaphragm 8 and slightly stretch the diaphragm 8, the effect of buffering the diaphragm 8 is achieved, the buffer flattening rollers 3 are driven to rotate in the process that the diaphragm 8 moves downwards to be laminated, the buffer flattening rollers 3 rotate to flatten the diaphragm 8, and in the process that the diaphragm 8 is flattened, the static ropes 4 can well eliminate static electricity on the surface of the diaphragm.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a fold exhibition paper-back edition of lithium cell diaphragm is put which characterized in that: including two linear guide, two mounting substrate and buffering nip rolls, two linear guide are parallel to each other and leave the interval between, and two mounting substrate difference sliding connection are on the linear guide that corresponds, and the both ends of buffering nip rolls pivot rotate respectively to be connected on two mounting substrate, and the diameter of the centre at both ends of buffering nip rolls diminishes gradually, is provided with convex line on the roll surface of buffering nip rolls.

2. The lithium battery separator wrinkle flattening device according to claim 1, characterized in that: the roll surface of buffer memory nip roll on be provided with many convex chevron shape lines, many chevron shape lines are parallel to each other, the both ends of every chevron shape line extend to the both ends of buffer memory nip roll respectively.

3. The lithium battery separator wrinkle flattening device according to claim 1, characterized in that: two mounting substrate between be connected with the static rope, one of static rope is served and is connected with the earth connection, the static rope is adjacent to buffer memory nip roll and is on a parallel with the axis of buffer memory nip roll.

4. The lithium battery diaphragm fold flattening device according to claim 3, characterized in that: the two mounting substrates are fixedly connected with copper noses, and two ends of the static rope are respectively connected with the copper noses on the two mounting substrates.

5. The lithium battery diaphragm fold flattening device according to claim 3, characterized in that: the distance between the static rope and the buffer flattening roller is 5-10 mm.

6. The lithium battery diaphragm fold flattening device according to claim 3, characterized in that: the static rope is a conductive polymer fiber rope.