CN109390506B

CN109390506B - Sealing structure between multiple single-cell batteries of battery and forming method of sealing structure

Info

Publication number: CN109390506B
Application number: CN201811178029.3A
Authority: CN
Inventors: 马永泉
Original assignee: Chaowei Power Group Co Ltd
Current assignee: Chaowei Power Group Co Ltd
Priority date: 2018-10-10
Filing date: 2018-10-10
Publication date: 2021-06-18
Anticipated expiration: 2038-10-10
Also published as: CN109390506A

Abstract

The invention discloses a sealing structure, which provides a multi-cell sealing structure of a battery and a forming method of the sealing structure, wherein the multi-cell sealing structure has simple structure and reliable sealing, can effectively avoid the leakage phenomenon among single cells after heat sealing, ensures the performance and the quality of the battery, and solves the technical problems that the leakage phenomenon among the single cells often occurs after heat sealing, the performance and the quality of the battery can not be ensured and the like in the prior art. The edges of the wrapping layers are fused with the corresponding longitudinal partition plates into a whole.

Description

Sealing structure between multiple single-cell batteries of battery and forming method of sealing structure

Technical Field

The invention relates to a sealing structure, in particular to a multi-cell battery sealing structure which is simple in structure and reliable in sealing and can effectively avoid the liquid leakage phenomenon between single cells after heat sealing and a forming method of the sealing structure.

Background

In the existing plastic shell battery, the sealing mode between the battery jar and the battery cover mainly comprises two modes of glue sealing and heat sealing, wherein the glue sealing is to bond the battery jar and the battery cover together by using a sealant; the heat-seal is with heating die with battery capping edge melting, bond the capping pressfitting together again, the advantage of heat-seal has saved sealed glue, the cost is saved, sealed operation can be accomplished in 30 seconds simultaneously, high production efficiency, but the operation process structure of heat-seal is complicated, especially when many cell batteries, because the connected mode between the battery cell generally sets up the open slot in the longitudinal baffle top between the cell, the downthehole series connection that realizes the intergroup of passing a bridge connecting piece impressed of the utmost point group in the both sides of connecting the longitudinal baffle both sides, just because the existence of this open slot, the phenomenon of leakage between the cell often can appear after the heat-seal between the battery cover, lead to the performance and the quality of battery can't guarantee from this.

Disclosure of Invention

The invention mainly provides a multi-cell battery sealing structure and a forming method of the multi-cell battery sealing structure, which have the advantages of simple structure and reliable sealing, can effectively avoid the leakage phenomenon between single cells after heat sealing, and ensure the performance and the quality of the battery, and solves the technical problems that the leakage phenomenon between the single cells often occurs after heat sealing, the performance and the quality of the battery can not be ensured, and the like in the prior art.

The technical problem of the invention is mainly solved by the following technical scheme: the utility model provides a seal structure between many single check batteries of battery, includes battery housing, and battery housing separates through indulging the baffle and forms a plurality of battery jar, is equipped with the gap bridge breach that can hold the gap bridge connecting piece and pass through in the top of indulging the baffle, the gap bridge connecting piece is opening U font structure down, and the gap bridge connecting piece centre gripping of U font is in gap bridge breach both sides, and in its open end extended to the battery jar that corresponds the side respectively outwards, the gap bridge connecting piece that gap bridge breach department corresponds is covering the parcel layer outward, and the border and the vertical baffle melting that corresponds of parcel layer are as an organic whole. A cross bridge connecting piece for connecting in adjacent battery jar battery piece utmost point post passes through the parcel layer to be fixed on the longitudinal baffle, and because parcel layer and longitudinal baffle fuse as an organic whole, makes the cross bridge connecting piece inlay the dress in longitudinal baffle and the synthetic airtight space of parcel layer enclosure, does not have the connecting gap between cross bridge connecting piece and the gap of passing a bridge promptly, consequently the weeping phenomenon can not take place between the single check after the heat-seal, simple structure, and is sealed reliable, has guaranteed the performance and the quality of battery.

Preferably, the top of the gap bridge connecting piece is provided with an overflowing notch, and the overflowing notch penetrates through the bridge connecting piece and is communicated with the longitudinal partition plate clamped in the opening of the gap bridge connecting piece. Through the top that corresponds above the bridge connection spare sets up and overflows the breach, when adopting injection moulding parcel layer, the plastics of fuse state can be through overflowing in the breach gets into the U-shaped clamping mouth of bridge connection spare, make parcel layer "surround entirely" formula from the face and wrap up the bridge connection spare, and the plastics of fuse state melts with the longitudinal baffle again and is integrateed to the seamless fixed connection of bridge connection spare has been guaranteed.

Preferably, the gap bridge gap is rectangular, the two ends of the bottom edge of the gap bridge gap are respectively provided with a flow guide block, and a gap is formed between each flow guide block and the corresponding gap bridge connecting piece. The diversion block corresponds to the gap bridge connecting piece on two sides of the overflowing notch so as to play a role in strengthening and supporting the gap bridge connecting piece, a gap is formed between the diversion block and the gap bridge connecting piece, molten plastic can flow into the gap along the overflowing notch, full wrapping in the U-shaped clamping opening of the gap bridge connecting piece is guaranteed, and sealing reliability is improved.

Preferably, the drainage block is integrally connected to the longitudinal partition plate corresponding to the edge of the gap bridge, and the wall thickness of the drainage block is smaller than that of the longitudinal partition plate corresponding to the connecting part. The drainage block is integrally connected, the strength is high, the U-shaped clamping opening edge of the gap bridge connecting piece is matched with the longitudinal partition plate, and when the thickness of the drainage block is smaller than that of the longitudinal partition plate, molten plastic is filled in a gap formed by wall thickness difference, so that reliable integral connection between the drainage block and the inner wall surface of the U-shaped clamping opening of the gap bridge connecting piece is guaranteed.

Preferably, two sides of the gap bridge connector corresponding to the lower part of the gap bridge notch extend inwards to form notches, and the notches extend outwards and are communicated with edges at two ends of the gap bridge connector. When the gap bridge connecting piece both sides formed the notch respectively, its projection on indulging the baffle is the T font promptly, has formed the parcel layer in notch department promptly during moulding plastics, has increased the adhesion surface of parcel layer on indulging the baffle from this to make the parcel layer higher with the bonding strength who indulges the baffle, the leakproofness is better.

Preferably, the wrapping layers corresponding to the side edges of the gap bridge notches extend outwards along the surfaces of the longitudinal partition plates to form U-shaped chucks, and the opening ends of the U-shaped chucks extend downwards to form pawls. The U-shaped chuck and the pawl are formed along the gap bridge connecting piece and the longitudinal partition plate butt joint seam, so that the joint strength of the butt joint can be improved, and the integral connection sealing is guaranteed.

Preferably, the upper surface of the wrapping layer is flush with the top edge of the corresponding longitudinal partition plate. After the gap bridge is filled up, the battery jar and the battery cover can be sealed in a hot melting way through a heat sealing machine, and the battery jars are ensured to be sealed independently.

Preferably, the wrapping layer is injection molded on the longitudinal partition plate. The wrapping layer is fused with the longitudinal partition plate into a whole through injection molding, the process is simple, and the sealing is reliable.

A method for forming a sealing structure between multiple single-cell batteries of a battery comprises the following sequential steps:

1) clamping a gap bridge connecting piece on two sides of the corresponding longitudinal partition plate in the gap of the gap bridge;

2) clamping a left die head and a right die head on the injection mold on corresponding gap bridge connecting pieces on two sides of the longitudinal partition plate, and closing, wherein a lower port of an injection gate on the injection mold is aligned to an overflowing notch;

3) extruding molten plastic into an injection gate of a mold by an injection molding machine to form a wrapping layer after injection molding is finished;

4) and after the wrapping layer is solidified, opening a left die head and a right die head of the die, and demolding.

Therefore, the sealing structure between the multiple single-cell batteries of the battery and the forming method and the method of the sealing structure have the following advantages: the gap bridge connecting piece is integrally fixed on the longitudinal partition plate through the wrapping layer formed by injection molding, and the wrapping layer and the longitudinal partition plate are fused into a whole, so that the gap bridge connecting piece is embedded in a closed space formed by the longitudinal partition plate and the wrapping layer, and no connecting gap exists between the gap bridge connecting piece and the gap bridge gap as well as between the gap bridge connecting piece and the longitudinal partition plate, so that no liquid leakage phenomenon occurs between single cells after heat sealing, the structure is simple, the sealing is reliable, and the performance and the quality of the battery are ensured; a wrapping layer is formed at the notch during injection molding, so that the attachment area of the wrapping layer on the longitudinal partition plate is increased, the bonding strength of the wrapping layer and the longitudinal partition plate is higher, and the sealing performance is better.

Description of the drawings:

fig. 1 is a schematic structural view of a sealing structure between multiple unit cells of a battery according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a schematic view of the present invention in injection molding;

FIG. 4 is a schematic view of the bridge connector of the present invention after installation;

FIG. 5 is a schematic view of the injection molded structure of the present invention.

The specific implementation mode is as follows:

the technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Example (b):

as shown in figure 1, the sealing structure of the battery between the single-cell batteries comprises a cuboid battery shell 1, a plurality of longitudinal partition plates 2 are equidistantly arranged in the cavity of the battery shell 1 along the length direction, the cavity of the battery shell 1 is partitioned by the longitudinal partition plates 2 to form a plurality of battery tanks 3, two ends above the longitudinal partition plates 2 are respectively provided with square gap bridge notches 5 for allowing gap bridge connecting pieces 4 to pass through, as shown in figures 2 and 4, the gap bridge connecting pieces 4 are U-shaped structures with downward openings, the U-shaped gap bridge connecting pieces 4 are clamped at two sides of the bottom of the gap bridge notch 5, the opening ends of the U-shaped gap bridge connecting pieces extend outwards along the top surface of the battery piece in the corresponding battery tank 3, the gap bridge notch 5 is externally covered with a wrapping layer 6, the wrapping layer 6 is formed by injection molding, the edge of the wrapping layer 6 is fused with the corresponding longitudinal partition plates 2, open in the middle of the top of gap bridge connecting piece 4 has square breach 7 that overflows, overflow breach 7 and run through gap bridge connecting piece 4 and communicate the 5 bottom surfaces of gap bridge breach of centre gripping in gap bridge connecting piece 4 opening, 5 base both ends at gap bridge breach are respectively integrated into one piece square drainage piece 8, and the wall thickness of drainage piece 8 is lighter than 2 wall thicknesses of the corresponding vertical partition board of junction to make drainage piece 8 and the 4 internal faces of gap bridge connecting piece that correspond the side form the clearance. The edges of two sides of the gap bridge connecting piece 4 corresponding to the lower part of the gap bridge gap 5 respectively extend inwards to form a rectangular notch 9, the notch 9 extends outwards along the length direction of the gap bridge connecting piece 4 to be communicated with the edges of two ends, and the edge of the upper part of the notch 9 is positioned in the wrapping layer 6. As shown in fig. 5, the wrapping layers 6 corresponding to the side edges of the gap bridge gap 5 extend horizontally outwards along the surfaces of the longitudinal partition plates 2 to form U-shaped clamps 10, the surfaces of the U-shaped clamps 10 are flush with the top edges of the corresponding longitudinal partition plates 2, the open ends of the U-shaped clamps 10 extend downwards along the surfaces of the longitudinal partition plates 2 on the corresponding sides to form pawls 11, and the lower edges of the pawls 11 are flush with the lower edges of the wrapping layers 6.

As shown in fig. 3, a method for forming a sealing structure between a plurality of battery cells includes the following sequential steps:

1) clamping a gap bridge connecting piece 4 at two sides of the corresponding longitudinal partition plate 2 in the gap bridge gap 5;

2) clamping a left die head 121 and a right die head 122 on the injection mold 12 on the corresponding gap bridge connecting pieces 4 at two sides of the longitudinal partition plate 2 for closing, and aligning the lower end opening of an injection gate 123 on the injection mold 12 with the overflowing notch 7;

3) the injection molding machine extrudes the molten plastic into an injection gate 123 of the mold 12, and a wrapping layer 6 is formed after injection molding is completed;

4) after the wrapping layer 6 is solidified, the left die 121 and the right die 122 of the mold 12 are opened, and the demolding is performed.

The specific embodiments described herein are merely illustrative of the principles of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a seal structure between many single check batteries of battery, includes battery housing (1), battery housing (1) separates through indulging baffle (2) and forms a plurality of battery jar (3), is equipped with gap bridge breach (5) that can hold gap bridge connecting piece (4) and pass through in the top of indulging baffle (2), its characterized in that: the gap bridge connecting piece (4) is of a U-shaped structure with an opening facing downwards, the U-shaped gap bridge connecting piece (4) is clamped at two sides of the gap bridge notch (5), the opening ends of the U-shaped gap bridge connecting piece extend outwards to the corresponding battery tanks (3), the corresponding gap bridge connecting piece (4) at the gap bridge notch (5) is covered with a wrapping layer (6), and the edge of the wrapping layer (6) is fused with the corresponding longitudinal partition plate (2) into a whole; an overflowing notch (7) is arranged at the top of the gap bridge connecting piece (4), and the overflowing notch (7) penetrates through the gap bridge connecting piece (4) and is communicated with a longitudinal partition plate (2) clamped in an opening of the gap bridge connecting piece (4); the gap bridge gap (5) is rectangular, the two ends of the bottom side of the gap bridge gap (5) are respectively provided with a drainage block (8), and a gap is formed between each drainage block (8) and the corresponding gap bridge connecting piece (4).

2. The battery multi-cell battery-to-battery sealing structure of claim 1, wherein: the diversion block (8) is integrally connected to the longitudinal partition plate (2) corresponding to the edge of the gap bridge (5), and the wall thickness of the diversion block (8) is smaller than that of the longitudinal partition plate (2) corresponding to the connecting part.

3. A battery multi-cell inter-cell sealing structure according to claim 1 or 2, characterized in that: the two sides of the gap bridge connecting piece (4) corresponding to the lower part of the gap bridge notch (5) extend inwards to form a notch (9), and the notch (9) extends outwards and is communicated with the edges of the two ends of the gap bridge connecting piece (4).

4. A battery multi-cell inter-cell sealing structure according to claim 1 or 2, characterized in that: and the wrapping layers (6) corresponding to the side edges of the gap bridge notches (5) extend outwards along the surface of the longitudinal partition plate (2) to form U-shaped chucks (10), and the open ends of the U-shaped chucks (10) extend downwards to form pawls (11).

5. A battery multi-cell inter-cell sealing structure according to claim 1 or 2, characterized in that: the upper surface of the wrapping layer (6) is flush with the top edge of the corresponding longitudinal partition plate (2).

6. A battery multi-cell inter-cell sealing structure according to claim 1 or 2, characterized in that: the wrapping layer (6) is formed on the longitudinal partition plate (2) in an injection molding mode.

7. A forming method of a sealing structure between multiple single-cell batteries of a battery is characterized in that: the method comprises the following steps:

1) clamping the gap bridge connecting piece (4) at two sides of the corresponding longitudinal partition plate (2) in the gap bridge gap (5);

2) clamping a left die head (121) and a right die head (122) on an injection mold (12) on corresponding gap bridge connecting pieces (4) on two sides of a longitudinal partition plate (2) for closing, and aligning a lower port of an injection gate (123) on the injection mold (12) with an overflowing notch (7);

3) the injection molding machine extrudes the molten plastic into an injection gate (123) of the mold (12) to complete injection molding to form a wrapping layer (6);

4) after the wrapping layer (6) is solidified, the left die head (121) and the right die head (122) of the die (12) are opened, and demolding is carried out.