WO2018049576A1

WO2018049576A1 - Soft pack battery case

Info

Publication number: WO2018049576A1
Application number: PCT/CN2016/098929
Authority: WO
Inventors: 郭培培; 何平; 汪云龙; 彭业军; 谢斌; 程文强
Original assignee: 东莞新能源科技有限公司
Priority date: 2016-09-13
Filing date: 2016-09-13
Publication date: 2018-03-22

Abstract

Disclosed is a soft pack battery case. The battery case is formed by connecting an upper packaging film (1) and a lower packaging film (2) in a sealed manner. The upper packing film (1) and the lower packaging film (2) each comprises an outer protective layer (P1), an inner fusion layer (P2) and a metal layer (P3) located between the outer protective layer (P1) and the inner fusion layer (P2), wherein the upper packaging film (1) and the lower packaging film (2) are connected in a sealed manner via the inner fusion layer (P2). The soft pack battery case comprises: a main body portion (M), with the upper packaging film (1) thereon being provided with a groove (14) for accommodating a cell (B); and side-sealing portions (S) located on two sides, in the width direction, of the main body portion (M), and adhered to side faces (M1), in the width direction, of the main body portion (M). The lower packaging film (2) on the side-sealing portion exceeds an upper end face (11), in the thickness direction, of the upper packaging film (1); the exceeded section is folded back between the upper packaging film (1) and the side face (M1) of the main body portion; the exceeded section covers the upper end face (11) of the upper packaging film to cover the metal layer (P3) exposed out of the upper end face of the upper packaging film; and the metal layer (P3) exposed out of a lower end face (22), in the thickness direction, of the lower packaging film (2) is clamped between the upper packaging film (1) and the side face (M1) of the main body portion.

Description

Soft pack battery case

Technical field

The present invention relates to the field of battery manufacturing, and more particularly to a soft pack battery case.

Background technique

When the battery is packaged into the soft-pack battery case by the upper and lower packaging films, the metal layer is exposed at the interface of the coating, and the metal layer is exposed to the risk of short-circuiting the electrical components, and the metal layer is easily exposed to the air and is corroded. There are safety quality issues.

In the prior art, the insulating metal foil is usually coated on the exposed metal layer, but the flexibility of the adhesive tape is poor, the bonding process is complicated, the automation requirement for the device is high, the production efficiency is low, and the product yield rate is not High; there is also a double hemming process to prevent the metal layer from being exposed, but the double hemming causes the thickness of the hemming to increase, reducing the volumetric energy density of the battery.

Summary of the invention

In view of the problems in the prior art, an object of the present invention is to provide a soft pack battery case which can save materials, reduce cost, improve automated production efficiency, and improve the volumetric energy of a battery using the soft pack battery case of the present invention. density.

In order to achieve the above object, in a first aspect, the present invention provides a soft pack battery case which is formed by sealingly connecting an upper packaging film and a lower packaging film, and the upper packaging film and the lower packaging film each include an outer protective layer and an inner layer. And a fusion layer and a metal layer between the outer protective layer and the inner fusion layer, wherein the upper packaging film and the lower packaging film are sealingly connected by the inner fusion layer. The soft pack battery case comprises: a main body portion, wherein the upper packaging film is provided with a groove for accommodating the electric core; the side sealing portion is located at both sides of the main body portion in the width direction, and is bonded to the side of the main body portion along the width direction on. Wherein, the lower packaging film on the side sealing portion exceeds the upper end surface of the upper packaging film in the thickness direction, and the excess portion is folded back between the upper packaging film and the side surface of the main body portion, and the excess portion is covered with the packaging film The upper end surface is covered with a metal layer exposed on the upper end surface of the packaging film, and the metal layer exposed by the lower end surface of the lower packaging film in the thickness direction is sandwiched between the upper packaging film and the side surface of the main body portion.

In the soft pack battery case according to the first aspect of the present invention, the lower packaging film on the side seal portion covers the metal layer exposed on the upper end surface of the packaging film, and the metal layer exposed at the lower end surface of the lower package film is sandwiched Between the upper packaging film and the side surface of the main body portion, it is not necessary to affix the insulating adhesive paper on the upper end surface of the upper packaging film and the lower end surface of the lower packaging film, thereby saving material, reducing cost, improving automation production efficiency, and saving The space occupied by the insulating tape increases the volumetric energy density of the battery to which the soft pack battery case of the present invention is applied. At the same time, since only the portion of the lower packaging film beyond the upper end surface of the upper packaging film is folded back between the upper packaging film and the side surface of the main body portion, the thickness of the upper packaging film is reduced as compared with the existing double-folding process. Therefore, the soft pack battery case according to the present invention can further improve the volume energy density of the battery to which the soft pack battery case of the present invention is applied.

In order to achieve the above object, in a second aspect, the present invention provides a soft-pack battery case which is formed by sealingly connecting an upper packaging film and a lower packaging film, and the upper packaging film and the lower packaging film each include an outer protective layer and an inner layer. And a fusion layer and a metal layer between the outer protective layer and the inner fusion layer, wherein the upper packaging film and the lower packaging film are sealingly connected by the inner fusion layer. The soft pack battery case comprises: a main body portion, wherein the upper packaging film is provided with a groove for accommodating the electric core; the side sealing portion is located at both sides of the main body portion in the width direction, and is bonded to the side of the main body portion along the width direction on. Wherein, the upper packaging film on the side sealing portion exceeds the upper end surface of the lower packaging film in the thickness direction, and the excess portion is folded back onto the lower packaging film, and the excess portion covers the upper end surface of the lower packaging film to cover the lower packaging The metal layer exposed on the upper end surface of the film; the metal layer exposed on the lower end surface of the upper packaging film in the thickness direction is coated with an insulating paste.

In the soft pack battery case according to the second aspect of the present invention, the upper packaging film on the side seal portion covers the metal layer exposed on the upper end surface of the lower packaging film, and the metal layer exposed on the lower end surface of the upper packaging film is coated on the metal layer. Covered with insulating glue to prevent the metal layer from being exposed by the combination of the bent structure and the coated insulating glue, it is not necessary to apply an insulating adhesive tape on the lower end surface of the upper packaging film and the upper end surface of the lower packaging film. The utility model can save material, reduce cost, improve automation production efficiency, save space occupied by the insulating adhesive paper, and improve the volume energy density of the battery of the soft pack battery case to which the present invention is applied. In addition, the process of coating the insulating glue is simple, the applicability is strong, and the occupied space is small; at the same time, since only the portion of the upper packaging film beyond the upper end surface of the lower packaging film is folded back to the lower packaging film, the existing double folding The thickness of the lower packaging film is reduced as compared with the side process, so that the soft-pack battery case according to the present invention can further improve the volumetric energy density of the battery to which the soft-pack battery case of the present invention is applied.

DRAWINGS

1 is a schematic view of an embodiment of a soft pack battery case in accordance with the present invention;

2 is a schematic view of the front side seal portion of the soft pack battery case of FIG. 1 before being bonded to the main body portion;

Figure 3 is a cross-sectional view taken along line A-A of Figure 1;

Figure 4 is a schematic illustration of another embodiment of a pouch battery housing in accordance with the present invention;

Figure 5 is a plan view showing the side seal portion of the soft pack battery case of Figure 4 before being bonded to the main body portion;

Figure 6 is an enlarged view of a circled portion of Figure 5;

Figure 7 is a schematic illustration of yet another embodiment of a pouch battery housing in accordance with the present invention;

Figure 8 is a schematic view showing the side seal portion of the soft pack battery case of Figure 7 before being bonded to the main body portion;

Figure 9 is a cross-sectional view taken along line C-C of Figure 7.

Among them, the reference numerals are as follows:

1 upper packaging film P3 metal layer

11 upper end face M main body part

12 lower end face M1 side

13 rear end face S side seal

14 groove B battery

2 lower packaging film G1 glue

21 upper end face G2 insulating glue

22 lower end face L length direction

23 rear end face W width direction

P1 outer protective layer T thickness direction

P2 inner fusion layer

detailed description

The soft pack battery case of the present invention will be described in detail below with reference to the accompanying drawings.

First, a soft pack battery case according to a first aspect of the present invention will be described.

1 to 6, the soft pack battery case according to the present invention is formed by sealingly connecting the upper package film 1 and the lower package film 2, and the upper package film 1 and the lower package film 2 each include an outer protective layer P1 and an inner fusion layer. P2 and a metal layer P3 between the outer protective layer P1 and the inner fusion layer P2, wherein the upper packaging film 1 and the lower packaging film 2 are hermetically connected by the inner fusion layer P2. The soft pack battery case includes: a main body portion M, which The upper upper packaging film 1 is provided with a recess 14 for accommodating the battery core B; the side seal portion S is located on both sides in the width direction W of the main body portion M, and is bonded to the side surface M1 of the main body portion M in the width direction W.

Wherein, the lower package film 2 on the side seal portion S exceeds the upper end surface 11 of the upper package film 1 in the thickness direction T, and the excess portion is folded back to the upper package film 1 and the main body portion M (on the side seal portion S) Between the side faces M1, the excess portion covers the upper end surface 11 of the packaging film 1 to cover the metal layer P3 exposed by the upper end surface 11 of the packaging film 1, and the lower packaging film 2 is exposed at the lower end surface 22 of the thickness direction T. The metal layer P3 is sandwiched between the upper packaging film 1 and the side surface M1 of the main body portion M.

In the soft pack battery case according to the present invention, since the lower package film 2 on the side seal portion S covers the metal layer P3 exposed by the upper end surface 11 of the packaging film 1, and the lower end surface 22 of the lower package film 2 is exposed The metal layer P3 is sandwiched between the upper packaging film 1 and the side surface M1 of the main body portion M, so that it is not necessary to apply an insulating tape on the upper end surface 11 of the upper packaging film 1 and the lower end surface 22 of the lower packaging film 2, thereby saving material. The cost is reduced, the automated production efficiency is improved, the space occupied by the insulating adhesive tape is saved, and the volumetric energy density of the battery to which the soft pack battery case of the present invention is applied is improved. At the same time, since only the portion of the lower packaging film 2 beyond the upper end surface 11 of the upper packaging film 1 is folded back between the upper packaging film 1 and the side surface M1 of the main body portion M, it is reduced by one compared with the existing double-folding process. The thickness of the upper packaging film 1 (the upper packaging film 1 is not folded back), therefore, the soft pack battery case according to the present invention can further improve the volumetric energy density of the battery to which the soft pack battery case of the present invention is applied.

It is added here that the exposure of the metal layer is liable to cause short circuit of the battery and corrosion of the battery case of the soft pack. At the sealing joint of the upper packaging film 1 and the lower packaging film 2, the inner fusion layer P2 of the upper packaging film 1 and the inner fusion layer P2 of the lower packaging film 2 are fused together.

In the soft pack battery case according to the present invention, referring to Figs. 1, 3 and 4, the side seal portion S is bonded to the side surface M1 of the main body portion M in the width direction W by the glue G1. In the prior art, the side seal portion S is usually bonded to the side surface M1 of the main body portion M by using a double-sided tape. However, the adhesive strength of the double-sided tape is poor, and the problem that the side seal portion S is opened easily occurs. The soft bag of the present invention The battery case is bonded to the side surface M1 of the main body portion M by the glue G1 having high adhesive property, and the adhesive force between the side seal portion S and the side surface M1 of the main body portion M can be effectively ensured. Glue G1 can be a hot melt adhesive (such as polyurethane hot melt adhesive, ethylene and its copolymer hot melt adhesive).

In the soft pack battery case according to the present invention, referring to Figs. 1 and 2, the metal layer P3 exposed by the lower end film 23 of the lower wrap film 2 beyond the portion of the upper wrap film 1 is coated with an insulating paste G2. . In the preparation process of the soft pack battery case of the present invention, it is necessary to cut the upper packaging film 1 The width (the state in FIG. 2) of the lower packaging film 2 in the width direction W can be made larger than the upper packaging film 1, and the rear end surface 23 of the lower packaging film 2 beyond the upper packaging film 1 in the longitudinal direction L can expose the metal layer. Therefore, the insulating rubber G2 is coated on the rear end surface 23 to prevent the metal layer P3 from being exposed.

In the soft pack battery case according to the present invention, the insulating glue G2 is a hot melt adhesive or a UV adhesive, preferably an acrylate UV adhesive, a polyurethane hot melt adhesive or a hot melt adhesive of ethylene and a copolymer thereof.

In the soft pack battery case according to the present invention, referring to Figs. 4 to 6, the portion of the lower wrap film 2 that extends beyond the upper wrap film 1 in the longitudinal direction L is bent inwardly so that the rear end face 23 is bent. The exposed metal layer P3 is sandwiched between the side surface M1 of the main body portion M and the lower packaging film 2. Referring to FIG. 6, after the portion of the lower packaging film 2 beyond the upper packaging film 1 is folded back to the upper packaging film 1, the rear end surface 23 is bent inwardly onto the lower packaging film 2, and finally the side sealing portion S is bent. The upper packaging film 1 and the lower packaging film 2 are bonded to the side surface M1 of the main body portion M; at this time, referring to FIG. 4, the rear end surface 23 is sandwiched between the side surface M1 of the main body portion M and the lower packaging film 2 Therefore, the metal layer P3 exposed by the rear end surface 23 is prevented from being exposed.

In the pouch battery case according to the present invention, the side seal portion S is provided with an opening in the coating range of the glue G1. The opening can increase the amount of application of the glue G1, thereby increasing the adhesion between the side seal portion S and the side surface M1 of the main body portion M.

In the soft pack battery case according to the present invention, the upper package film 1 and the lower package film 2 are an aluminum plastic film or a steel plastic film.

Next, a soft pack battery case according to a second aspect of the present invention will be described.

7 to 9, the soft pack battery case according to the present invention is formed by sealingly connecting the upper package film 1 and the lower package film 2, and the upper package film 1 and the lower package film 2 each include an outer protective layer P1 and an inner fusion layer. P2 and a metal layer P3 between the outer protective layer P1 and the inner fusion layer P2, wherein the upper packaging film 1 and the lower packaging film 2 are hermetically connected by the inner fusion layer P2. The soft pack battery case includes a main body portion M on which the upper package film 1 is provided with a recess 14 for accommodating the battery core B, and a side seal portion S located on both sides of the main body portion M in the width direction W and bonded thereto. The main body portion M is on the side surface M1 in the width direction W.

Wherein the upper packaging film 1 on the side seal portion S extends beyond the upper end surface 21 of the lower packaging film 2 in the thickness direction T, and the excess portion is folded back onto the lower packaging film 2 (on the side seal portion S), the excess The upper end surface 21 of the lower packaging film 2 is covered to cover the metal layer P3 exposed by the upper end surface 21 of the lower packaging film 2; the metal layer P3 exposed by the lower end surface 12 of the upper packaging film 1 in the thickness direction T is coated with Insulating glue G2.

In the soft pack battery case according to the present invention, since the upper package film 1 on the side seal portion S covers the metal layer P3 exposed by the upper end surface 21 of the lower package film 2, and the lower end surface 12 of the upper package film 1 is exposed The metal layer P3 is coated with an insulating glue G2 to prevent the metal layer P3 from being exposed by the combination of the bent structure and the coating insulating glue G2, so that the lower end surface 12 and the lower packaging film of the upper packaging film 1 are not required. The adhesive tape is adhered to the upper end surface 21 of the second surface, which can save material, reduce cost, improve automation production efficiency, save space occupied by the insulating adhesive paper, and improve the volume energy density of the battery of the soft pack battery case to which the present invention is applied. . In addition, the process of coating the insulating glue G2 is simple, the applicability is strong, and the occupied space is small; at the same time, since only the portion of the side sealing portion S beyond the upper end surface 21 of the lower packaging film 2 is folded back to the lower packaging film 2, so compared with the existing double-folding process, the thickness of the lower packaging film 2 is reduced (the lower packaging film 2 is not folded back), so the soft-pack battery case according to the present invention can further improve the application The volumetric energy density of the battery of the inventive soft pack battery case.

In the soft pack battery case according to the present invention, referring to Figs. 7 and 9, the side seal portion S is bonded to the side surface M1 of the main body portion M in the width direction W by the glue G1. In the prior art, the side seal portion S is usually bonded to the side surface M1 of the main body portion M by using a double-sided tape. However, the adhesive strength of the double-sided tape is poor, and the problem that the side seal portion S is opened easily occurs. The soft bag of the present invention The battery case is bonded to the side surface M1 of the main body portion M by the glue G1 having high adhesive property, and the adhesive force between the side seal portion S and the side surface M1 of the main body portion M can be effectively ensured. Glue G1 can be a hot melt adhesive (such as polyurethane hot melt adhesive, ethylene and its copolymer hot melt adhesive).

In the soft pack battery case according to the present invention, referring to Figs. 7 and 8, the metal layer P3 exposed by the rear end face 13 of the upper package film 1 beyond the lower package film 2 in the longitudinal direction L is coated with an insulating glue G2. . In the preparation process of the soft pack battery case of the present invention, the lower wrap film 2 needs to be cut so that the width of the upper wrap film 1 in the width direction W (the state in FIG. 2) exceeds the lower wrap film 2, The rear end surface 13 of the above-mentioned packaging film 1 beyond the portion of the lower packaging film 2 in the longitudinal direction L exposes the metal layer, so that the insulating rubber G2 is coated on the rear end surface 13 to prevent the metal layer P3 from being exposed.

In the soft pack battery case according to the invention, the side seal portion S is provided with an opening in the coating range of the glue G1. The opening can increase the coating amount of the glue G1, thereby improving the side seal portion S and The adhesive force between the side faces M1 of the main body portion M.

Claims

A soft pack battery case is formed by sealingly connecting an upper packaging film (1) and a lower packaging film (2), and the upper packaging film (1) and the lower packaging film (2) both comprise an outer protective layer (P1) and an inner layer. a fusion layer (P2) and a metal layer (P3) between the outer protective layer (P1) and the inner fusion layer (P2), wherein the upper packaging film (1) and the lower packaging film (2) pass through the inner fusion layer (P2) Sealed connection, soft pack battery housing includes:

a main body portion (M) on which the upper packaging film (1) is provided with a recess (14) for receiving the battery core (B);

a side seal portion (S) located on both sides of the main body portion (M) in the width direction (W) and bonded to the side surface (M1) of the main body portion (M) in the width direction (W);

It is characterized in that

The lower packaging film (2) on the side seal portion (S) extends beyond the upper end surface (11) of the upper packaging film (1) in the thickness direction (T), and the excess portion is folded back to the upper packaging film (1) and the main body portion Between the side faces (M1) of (M), the excess portion covers the upper end surface (11) of the packaging film (1) to cover the metal layer exposed by the upper end surface (11) of the packaging film (1) ( P3), the metal layer (P3) exposed by the lower end surface (22) of the lower packaging film (2) in the thickness direction (T) is sandwiched between the upper packaging film (1) and the side surface (M1) of the main body portion (M) .
The soft pack battery case according to claim 1, wherein the side seal portion (S) is adhered to the side surface (M1) of the main body portion (M) in the width direction (W) by glue (G1).
A soft pack battery case according to claim 1, wherein the lower packaging film (2) extends beyond the metal film (P3) of the portion of the upper packaging film (1) which is exposed in the longitudinal direction (L) of the rear end surface (23). ) is coated with an insulating glue (G2).
The soft pack battery case according to claim 3, wherein the insulating glue (G2) is a hot melt adhesive or a UV adhesive.
The soft pack battery case according to claim 4, wherein the insulating glue (G2) is an acrylate UV glue, a polyurethane hot melt adhesive or a hot melt adhesive of ethylene and a copolymer thereof.
A soft pack battery case according to claim 1, wherein the portion of the lower wrap film (2) beyond the upper wrap film (1) is bent inwardly along the rear end face (23) of the length direction (L) to The metal layer (P3) exposing the rear end surface (23) is sandwiched between the side surface (M1) of the main body portion (M) and the lower packaging film (2).
A soft pack battery case according to claim 2, characterized in that the side seal portion (S) is provided with an opening in the coating range of the glue (G1).
A soft pack battery case is formed by sealingly connecting an upper packaging film (1) and a lower packaging film (2), and the upper packaging film (1) and the lower packaging film (2) both comprise an outer protective layer (P1) and an inner layer. a fusion layer (P2) and a metal layer (P3) between the outer protective layer (P1) and the inner fusion layer (P2), wherein the upper packaging film (1) and the lower packaging film (2) pass through the inner fusion layer (P2) Sealed connection, soft pack battery housing includes:

a main body portion (M) on which the upper packaging film (1) is provided with a recess (14) for receiving the battery core (B);

a side seal portion (S) located on both sides of the main body portion (M) in the width direction (W) and bonded to the side surface (M1) of the main body portion (M) in the width direction (W);

It is characterized in that

The upper packaging film (1) on the side seal portion (S) extends beyond the upper end surface (21) of the lower packaging film (2) in the thickness direction (T), and the excess portion is folded back onto the lower packaging film (2), The excess portion covers the upper end surface (21) of the lower packaging film (2) to cover the metal layer (P3) exposed by the upper end surface (21) of the lower packaging film (2);

The metal layer (P3) exposed on the lower end surface (12) of the upper packaging film (1) in the thickness direction (T) is coated with an insulating paste (G2).
The soft pack battery case according to claim 8, wherein the side seal portion (S) is adhered to the side surface (M1) of the main body portion (M) in the width direction (W) by glue (G1).
A soft pack battery case according to claim 8, wherein the upper packaging film (1) extends beyond the metal film of the portion of the lower packaging film (2) exposed in the longitudinal direction (L) of the rear end surface (13) (P3) ) is coated with an insulating glue (G2).
The soft pack battery case according to claim 10, wherein the insulating glue (G2) is a hot melt adhesive or a UV adhesive.
The soft pack battery case according to claim 11, wherein the insulating glue (G2) is an acrylate UV glue, a polyurethane hot melt adhesive or a hot melt adhesive of ethylene and a copolymer thereof.
A soft pack battery case according to claim 9, wherein the side seal portion (S) is provided with an opening in the coating range of the glue (G1).