CN211555947U

CN211555947U - Square lithium battery film-coating structure

Info

Publication number: CN211555947U
Application number: CN202020389136.7U
Authority: CN
Inventors: 陈建华; 祝捷
Original assignee: Jiangsu Higee Energy Co Ltd
Current assignee: Jiangsu Higee Energy Co Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-09-22
Anticipated expiration: 2030-03-25

Abstract

The utility model relates to a square lithium cell diolame structure, including battery case, the outer cladding of battery case has integrated into one piece's PET insulation protection film, PET insulation protection film includes PET base film and the insulating glue of even coating on it, and the PET base film includes the big incision of first big incision and second, and the first folded piece and the big folded piece that turns over of both sides that turns over of middle part are divided into with PET base film upside edge to first big incision, the big incision of second, and the folded piece is turned over to the first third that turns over the folded piece again and the fourth of turning over of the fold line about, and the first little side that turns over folded piece and fourth folded piece cladding battery case that turns over, the area of little side of battery case just in time turns over the folded piece sum for first folded piece and two fourth folded piece areas that turn over. The utility model discloses to the full cladding of lithium cell side and bottom surface, to the cladding of lithium cell top part simultaneously, the cladding rear surface is individual layer structure, does not have multilayer film stack phenomenon, does not influence the size of battery, improves square lithium cell energy density.

Description

Square lithium battery film-coating structure

Technical Field

The utility model relates to a square lithium cell makes technical field, concretely relates to square lithium cell diolame structure.

Background

At present, the shell of the lithium ion power battery is an aluminum shell made of aluminum materials or a steel shell made of stainless steel materials. The shell walls of the steel shell and the aluminum shell are very thin, so that the wear resistance and the deformation resistance are poor, particularly, in the preparation process of the battery, the shell needs to be subjected to a plurality of operation procedures such as spot welding, laser welding, liquid injection, cleaning, chemical composition and capacity grading, and each procedure needs to fix the battery shell by a clamp to complete each process operation, so that the surface of the shell is damaged to different degrees, and pits and scratches are generated on the surface. Therefore, the battery shell needs to be coated, and the coating can play a certain role in protecting the battery.

The simple film needs to coat 4 surfaces of the lithium battery except the top and the bottom, and the bottom patch is additionally pasted at the bottom, so that the following defects exist: the working procedure and the material cost are increased; in the transportation and use process, the bottom patch is easy to fall off, the bottom of the metal shell is easy to contact and collide with the metal box body to damage the battery, and even short circuit and other dangerous situations occur.

Chinese patent with patent publication No. CN206322806U discloses a power battery shell envelope structure, and there are 4 incisions in square diaphragm middle part both sides, form 2 pieces of turning up, and 2 pieces of turning up are at the base angle of battery shell both sides, and square diaphragm can form the stack phenomenon in the battery side, and this phenomenon can influence the whole size of battery to influence battery energy density.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and provide a square lithium battery coating structure, which further reduces the usage amount of raw materials and the material cost on the premise of ensuring the protection effect on the lithium battery; the coating mode is optimized, and the square battery shell is prevented from being damaged; to lithium cell side and bottom surface full cladding, to the partial cladding in lithium cell top simultaneously to play the protection to the laser welding position of square lithium cell top cap and casing, prevent to take place the fish tail, damage and collide the laser welding position phenomenon at the in-process of transport and equipment, avoid the extreme condition such as lithium cell weeping even firing explosion, improve the security performance of lithium cell.

The purpose of the utility model is realized like this:

a film coating structure of a square lithium battery comprises a battery shell, wherein a PET (polyethylene terephthalate) insulating protective film which is integrally formed is coated outside the battery shell, the PET insulating protective film comprises a PET base film and insulating glue which is uniformly coated on the PET base film, a first large notch and a second large notch are arranged on the upper side of the PET base film, a third large notch and a fourth large notch are arranged on the lower side of the PET base film, a first small notch and a second small notch are arranged on the left side of the PET base film, a third small notch and a fourth small notch are arranged on the right side of the PET base film, the upper side edge of the PET base film is divided into a first folding piece in the middle and large folding pieces on two sides by the first large notch, the second large notch and an upward folding line, and the large folding pieces are correspondingly; the lower side edge of the PET base film is divided into a first turnover piece in the middle and large turnover pieces on two sides by a third large cut, a fourth large cut and a lower turnover line, and the large turnover pieces are correspondingly divided into a third turnover piece and a fourth turnover piece by a left turnover line and a right turnover line; the first turnover sheet and the two fourth turnover sheets on the same side just cover the small side of the battery shell.

Preferably, the area of the small side face of the battery shell is just the sum of the areas of the first turnover sheet and the two fourth turnover sheets on the same side.

Preferably, the vertex angles of the first large notch, the second large notch, the first small notch and the third small notch are on an upper folding line, the vertex angles of the third large notch, the fourth large notch, the second small notch and the fourth small notch are on a lower folding line, the vertex angles of the first large notch and the third large notch are on one middle folding line, and the vertex angles of the second large notch and the fourth large notch are on the other middle folding line; the two middle folding lines, the upper folding line and the lower folding line form a central plane of the PET base film, and the size of the central plane is matched with the bottom surface of the battery shell.

Preferably, the first flap piece is triangular, and the bottom edge of the first flap piece is the width of the central plane.

Preferably, the sum of the heights of the fourth flap pieces on the same side is the width of the central plane.

Preferably, the apex angle of each cut is 90 °.

Preferably, the first flap piece is an isosceles right triangle.

The utility model has the advantages that:

the utility model cancels the bottom patch, reduces the working procedures, reduces the material cost and improves the production efficiency; the coating method is optimized, the square lithium battery shell is effectively prevented from being damaged, and the safety performance is improved; the side face and the bottom face of the lithium battery are completely coated, the top portion of the lithium battery is partially coated, the surface is of a single-layer structure after coating, the phenomenon of overlapping of multiple layers of thin films is avoided, the size of the battery is not affected, and the energy density of the square lithium battery is improved.

Drawings

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

Fig. 2 is a schematic view of the folded structure of fig. 1.

Fig. 3 is a schematic structural view of the battery case after being coated with a PET insulating protective film.

Wherein: a first large incision 1; a second large incision 2; a third large cut 3; a fourth large cut 4; a first small incision 5; a second small incision 6; a third small incision 7; a fourth small incision 8; a central plane 9; a first flap 10; a second flap 11; a third flap 12; a fourth fold-over flap 13; the large side 14.

Detailed Description

Referring to fig. 1-3, the utility model relates to a square lithium cell diolame structure, including battery case, the outer cladding of battery case has integrated into one piece's PET insulating protection film, PET insulating protection film includes the PET base film and evenly coats the insulating glue on it, PET base film upside is equipped with first big incision 1, the big incision 2 of second, and the downside is equipped with the big incision 3 of third and the big incision 4 of fourth, and the left side is equipped with the little incision 6 of first little incision 5 and second, and the right side is equipped with the little incision 7 of third and the little incision 8 of fourth, and each incision is isosceles right triangle, and each notched apex angle is 90.

The vertex angles of the first large notch 1, the second large notch 2, the first small notch 5 and the third small notch 7 are on the upper folding line; the vertex angles of the third large notch 3, the fourth large notch 4, the second small notch 6 and the fourth small notch 8 are on the lower folding line; the vertex angles of the first large notch 1 and the third large notch 3 are on one middle folding line, and the vertex angles of the second large notch 2 and the fourth large notch 4 are on the other middle folding line; the vertex angles of the first small incision 5 and the second small incision 6 are on the left folding line, and the vertex angles of the third small incision 7 and the fourth small incision 8 are on the right folding line.

The two middle folding lines, the upper folding line and the lower folding line form a central plane 9 of the PET base film, the size of the central plane 9 is matched with the bottom surface of the battery shell, first folding pieces 10 are correspondingly formed between the first large notch 1 and the second large notch 2 and between the third large notch 3 and the fourth large notch 4, the first folding pieces 10 are isosceles right triangles, the bevel edge of each first folding piece 10 is the width of the central plane 9, and the height of the bevel edge of each first folding piece 10 is half of the bevel edge.

And second folding pieces 11 are correspondingly formed between the first small notch 5 and the second small notch 6 and between the third small notch 7 and the fourth small notch 8, and the second folding pieces 11 are isosceles trapezoids.

The first small incision 5, the second small incision 6 and the left folding line divide the left edge of the PET base film into a second folding flap 11 in the middle and third folding flaps 12 on both sides, and the third small incision 7, the fourth small incision 8 and the right folding line divide the right edge of the PET base film into a second folding flap 11 in the middle and third folding flaps 12 on both sides.

The first large incision 1, the second large incision 2 and the upward folding lines divide the upper side edge of the PET base film into a first folding sheet 10 in the middle and large folding sheets on two sides, and the left and right folding lines divide the large folding sheets into a third folding sheet 12 and a fourth folding sheet 13. The third large incision 3, the fourth large incision 4 and the lower fold line divide the lower side edge of the PET base film into a first fold flap 10 in the middle and large fold flaps on both sides, and the left and right fold lines divide the large fold flaps into a third fold flap 12 and a fourth fold flap 13.

The upper folding line, the lower folding line, the left folding line and one of the middle folding lines enclose a large side 14, and the upper folding line, the lower folding line, the right folding line and the other middle folding line also enclose the large side 14.

The folding lines are folded inwards, the central surface 9 wraps the bottom surface of the battery shell, the first folding sheet 10 and the fourth folding sheet 13 are used for wrapping the small side surface of the battery shell, the large side surface of the battery shell, and the second folding sheet 11 and the third folding sheet 12 are used for wrapping part of the top surface of the battery shell. The area of the small side of the battery shell is just equal to the sum of the areas of the first folding sheet 10 and the two fourth folding sheets. The small side surfaces are of single-layer structures, the phenomenon of overlapping of multiple layers of thin films is avoided, and the size of the battery is not influenced.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a square lithium cell diolame structure, includes battery case, the external cladding of battery case has integrated into one piece's insulating protection film of PET, the insulating protection film of PET includes the PET base film and evenly coats the insulating glue on it, its characterized in that: the PET base film is characterized in that a first large notch (1) and a second large notch (2) are arranged on the upper side of the PET base film, a third large notch (3) and a fourth large notch (4) are arranged on the lower side of the PET base film, a first small notch (5) and a second small notch (6) are arranged on the left side of the PET base film, a third small notch (7) and a fourth small notch (8) are arranged on the right side of the PET base film, the first large notch (1), the second large notch (2) and an upward folding line divide the edge of the upper side of the PET base film into a first folding piece (10) in the middle and large folding pieces on two sides, and the left and right folding lines correspondingly divide the large folding pieces into a third folding piece (12; the lower side edge of the PET base film is divided into a first turnover piece (10) in the middle and large turnover pieces on two sides by a third large notch (3), a fourth large notch (4) and a lower turnover line, the large turnover pieces are divided into a third turnover piece (12) and a fourth turnover piece (13) by a left turnover line and a right turnover line, and the first turnover piece and the two fourth turnover pieces on the same side just wrap the small side face of the battery shell.

2. The coating structure of the square lithium battery as claimed in claim 1, wherein: the area of the small side surface of the battery shell is just the sum of the areas of the first folding piece (10) and the two fourth folding pieces (13) on the same side.

3. The coating structure of the square lithium battery as claimed in claim 1, wherein: the vertex angles of the first large notch (1), the second large notch (2), the first small notch (5) and the third small notch (7) are on an upper folding line, the vertex angles of the third large notch (3), the fourth large notch (4), the second small notch (6) and the fourth small notch (8) are on a lower folding line, the vertex angles of the first large notch (1) and the third large notch (3) are on one middle folding line, and the vertex angles of the second large notch (2) and the fourth large notch (4) are on the other middle folding line;

the two middle folding lines, the upper folding line and the lower folding line form a central plane (9) of the PET base film, and the size of the central plane (9) is matched with the bottom surface of the battery shell.

4. The coating structure of the square lithium battery as claimed in claim 1, wherein: the first folding piece (10) is triangular, and the bottom edge of the first folding piece (10) is the width of the central plane (9).

5. The coating structure of the square lithium battery as claimed in claim 4, wherein: the sum of the heights of the fourth folding sheets (13) on the same side is the width of the central plane (9).

6. The coating structure of the square lithium battery as claimed in claim 1, wherein: the apex angle of each cut was 90 °.

7. The coating structure of the square lithium battery as claimed in claim 1, wherein: the first folding piece (10) is an isosceles right triangle.