CN218385334U

CN218385334U - Laminate polymer battery and encapsulation equipment

Info

Publication number: CN218385334U
Application number: CN202222778733.0U
Authority: CN
Inventors: 游悠
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-01-24
Anticipated expiration: 2032-10-20

Abstract

The utility model belongs to the technical field of batteries, and discloses a soft package battery and packaging equipment, wherein the soft package battery comprises an electric core, an aluminum-plastic film and an additional heat sealing layer, the electric core is coated by the aluminum-plastic film, a sealing part is arranged at the edge of the aluminum-plastic film, and the sealing parts are mutually contacted and welded into a whole; an additional heat seal layer is disposed adjacent to the seal portion. The packaging equipment is used for packaging the soft package battery. The seal parts of the aluminum-plastic films are contacted and welded, so that the fixed connection of the edges of the aluminum-plastic films is realized; the additional heat seal layer enables the connection of the two aluminum plastic films to be firmer. Therefore, the utility model provides a laminate polymer battery and encapsulation equipment has improved the fastness that the plastic-aluminum membrane bonded, has avoided the junction to expand and leads to the battery weeping.

Description

Laminate polymer battery and encapsulation equipment

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a laminate polymer battery and encapsulation equipment.

Background

The pouch cell is a liquid lithium ion Chi Taoshang one layer polymer housing. Structurally, the aluminum-plastic film is adopted for packaging, and the soft package battery can only blow and crack at most under the condition of potential safety hazard. Due to the advantages of good safety performance, light weight, large capacity and the like, the soft package battery is widely applied to electronic products in various fields.

In the prior art, as shown in fig. 1, a soft package battery includes a battery cell 1 'and an aluminum-plastic film 2' covering the battery cell 1', an inner cavity for accommodating the battery cell 1' is formed by melting and bonding edges of the aluminum-plastic film 2', and in a use process, gas in the inner cavity generates an outward expansion force on the aluminum-plastic film 2', and a bonding part is easily expanded, so that leakage of the battery is caused.

Therefore, a pouch battery and a packaging apparatus are needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a laminate polymer battery and encapsulation equipment for improve the fastness that the plastic-aluminum membrane bonded, avoid the junction to expand and lead to the battery weeping.

To achieve the purpose, the utility model adopts the following technical proposal:

a pouch battery comprising:

an electric core;

the aluminum-plastic film wraps the battery cell, a sealing part is arranged at the edge of the aluminum-plastic film, and the two sealing parts are mutually contacted and welded into a whole;

and an additional heat seal layer disposed adjacent to the seal portion.

As a preferable technical solution of the pouch battery, the seal portion and the additional heat seal layer are integrated by heat melting.

As a preferred technical scheme of the soft package battery, the thickness of the additional heat sealing layer is 5-20 um.

As a preferable technical scheme of the soft package battery, the additional heat sealing layer is made of a PP material or a CPP material.

As a preferable technical scheme of the soft package battery, the width of the seal part is 8mm-15mm.

As a preferred technical scheme of the soft package battery, the aluminum plastic film comprises an outer nylon layer, a middle aluminum foil layer and an inner heat sealing layer which are sequentially overlapped.

And the packaging equipment is used for packaging the soft package battery.

As an optimal technical scheme of the packaging equipment, the packaging equipment comprises two oppositely arranged seal heads, one side of each seal head, facing to the other seal head, comprises a first seal face and a second seal face, wherein an included angle is formed between the first seal face and the second seal face, the first seal face is used for welding two layers of seal parts, and the second seal face is used for forming the additional heat seal layer.

The utility model has the advantages that:

the utility model provides a soft-packaged battery, it includes electric core, cladding aluminium-plastic film outside electric core, has seal portion in aluminium-plastic film's edge, and two-layer seal portion contacts each other and welds integratively to the realization is to the cladding of electric core, and additional heat-seal layer and seal portion adjacent setting, additional heat-seal layer make that two-layer aluminium-plastic film is connected more firm. Therefore, the utility model provides a laminate polymer battery has improved the fastness that the plastic-aluminum membrane bonded, avoids the junction to expand and leads to the battery weeping.

The utility model provides an encapsulation equipment for the foretell laminate polymer battery of encapsulation has improved the fastness that the plastic-aluminum membrane bonded, avoids the junction to expand and leads to the battery weeping.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic diagram of a prior art pouch cell;

fig. 2 is a schematic view of an aluminum-plastic film provided in an embodiment of the present invention when the aluminum-plastic film is not sealed;

fig. 3 is a schematic view of a pouch battery according to an embodiment of the present invention;

FIG. 4 is a schematic view of a prior art header sealing aluminum plastic film;

fig. 5 is a schematic view of the packaging apparatus provided by the third embodiment of the present invention when sealing an aluminum-plastic film;

fig. 6 is a schematic diagram of the packaging device and the pouch battery provided by the third embodiment of the present invention in a separated state.

In the figure:

in fig. 1 and 4:

1', a battery cell; 2', an aluminum plastic film; 6', sealing heads;

in the remaining figures:

1. an electric core; 2. an aluminum-plastic film; 3. adding a heat sealing layer; 4. sealing edges; 5. a splint; 6. sealing the end;

21. a main body portion; 22. a seal section; 61. a first seal face; 62. a second seal face;

211. a protection part; 212. a central portion.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "mounted" are to be construed broadly and can include, for example, a mounted connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.

Example one

As shown in fig. 2 and fig. 3, this embodiment provides a pouch battery, which includes a battery core 1, two layers of aluminum-plastic films 2 and two clamping plates 5, where the two layers of aluminum-plastic films 2 are respectively coated on two sides of the battery core 1, and the two clamping plates 5 respectively abut against one side of the two layers of aluminum-plastic films 2 which are away from each other.

Specifically, the soft package battery comprises a battery cell 1, an aluminum plastic film 2 and an additional heat sealing layer 3, wherein the aluminum plastic film 2 wraps the battery cell 1, a sealing part 22 is arranged at the edge of the aluminum plastic film 2, and the two sealing parts 22 are mutually contacted and welded into a whole; the additional heat seal layer 3 is disposed adjacent to the seal portion 22.

In the soft package battery provided by the embodiment, the seal part 22 of the aluminum-plastic film 2 is melted and bonded, so that the edge of the aluminum-plastic film 2 is fixedly connected; the additional heat sealing layer 3 ensures that the two aluminum plastic films 2 are connected more firmly. Therefore, the laminate polymer battery provided by the embodiment improves the bonding firmness of the aluminum plastic film 2, and avoids the phenomenon that the bonding part expands to cause battery leakage.

Specifically, the aluminum plastic film 2 comprises an outer nylon layer, a middle aluminum foil layer and an inner heat sealing layer which are sequentially overlapped along the thickness direction of the aluminum plastic film, and the adjacent two layers are pressed and bonded through an adhesive. The inner heat-sealing layer is made of PP material or CPP material.

Specifically, the seal part 22 and the additional heat seal layer 3 are integrated by hot melting, so that the bonding firmness of the aluminum plastic film 2 is ensured.

In this embodiment, the inner heat sealing layer of the aluminum-plastic film 2 includes a main body portion 21 and a sealing portion 22 connected to the edge of the main body portion 21, the two sealing portions 22 are melted and bonded, the two main body portions 21 enclose an accommodating cavity, the battery cell 1 is accommodated in the accommodating cavity, the main body portion 21 includes a protection portion 211 adjacent to the sealing portion 22, and the two protection portions 211 are melted and collected into a whole to form the additional heat sealing layer 3. Since the seal portion 22 and the protection portion 211 are adjacent to each other, the seal portion 22 and the protection portion 211 are integrally formed by heat-melting.

Specifically, referring to fig. 2 and 3, the main body 21 further includes a central portion 212, the protection portion 211 is connected to an edge of the central portion 212, and a space enclosed by the central portion 212 and the additional heat sealing layer 3 is an accommodation cavity. The two-layer seal part 22 is melted and bonded to form a seal edge 4. Specifically, the central portion 212, the protection portion 211 and the seal portion 22 in the present embodiment are distributed along the center of the aluminum plastic film 2 toward the peripheral edge.

As shown in fig. 2, one aluminum-plastic film 2 is folded and overlapped by taking a middle broken line as a folding line to form two layers of aluminum-plastic films 2, one edge of the two layers of aluminum-plastic films 2 is the folding line, and the other three edges are melted and bonded to form three sealing edges 4.

Specifically, the sealing portions 22 of the inner heat sealing layers of the two sealing portions 22 are melted and bonded to realize the fixed connection of the edges of the aluminum plastic film 2.

Specifically, the width of the seal portion 22 is 8mm to 15mm, which can ensure the firmness of bonding.

In particular, the thickness of the additional heat seal layer 3 is 5um-20um. By the thickness, not only can the phenomenon that the additional heat sealing layer 3 occupies too much accommodating space due to too thick can be avoided, but also the bonding firmness of the aluminum plastic film 2 can be ensured. As shown in fig. 3, the thickness of the additional heat-seal layer 3 is the largest at the position where the seal edge 4 is connected, and the maximum thickness ranges from 5um to 20um, and gradually decreases from the position to both sides.

Optionally, the additional heat seal layer 3 is made of a PP material or a CPP material.

Example two

The embodiment provides a soft package battery, wherein the same or corresponding parts as those in the embodiment one are provided with the same reference numerals. For the sake of simplicity, only the difference between the second embodiment and the first embodiment will be described, which is the specific structure of the protection portion 211.

Specifically, an additional layer is stacked on the inner side of the protection part 211, and the additional layers of the two protection parts 211 are melted and gathered into a whole to form the additional heat seal layer 3.

In particular, the additional layer is made of a PP material or a CPP material.

EXAMPLE III

In the prior art, as shown in fig. 4, the sealing surfaces of the sealing heads 6' encapsulating the aluminum-plastic film 2' are flat, the sealing surfaces of two opposite sealing heads 6' are respectively clamped on two opposite sides of the edges of the two layers of aluminum-plastic films 2', only the edges of the aluminum-plastic films 2' can be melted and bonded, the protection parts 211 of the pouch batteries in the first embodiment and the second embodiment cannot be melted, and the pouch batteries in the first embodiment and the second embodiment cannot be encapsulated.

To this end, the present embodiment provides a packaging apparatus for packaging the pouch batteries in the first and second embodiments.

Specifically, as shown in fig. 5 and fig. 6, the packaging apparatus provided by this embodiment includes two opposite sealing heads 6, one side of each sealing head 6 facing the other sealing head 6 includes a first sealing surface 61 and a second sealing surface 62, the first sealing surface 61 and the second sealing surface 62 on the same sealing head 6 are adjacent and form an included angle, the two first sealing surfaces 61 are respectively clamped outside the two sealing portions 22 to weld the two sealing portions 22 to form a sealing edge 4, the two second sealing surfaces 62 are respectively abutted outside the two protection portions 211 to melt the two protection portions 211, and the melted fluids are collected into a whole to form the additional heat sealing layer 3.

The two sealing heads 6 of the packaging equipment provided by the embodiment can be respectively clamped on the outer sides of the two sealing parts 22 and simultaneously abut against the outer sides of the two protection parts 211, namely, the packaging equipment can simultaneously perform melting and bonding of the sealing parts 22 and melting and gathering of the protection parts 211, so as to form the sealing edge 4 and the additional heat sealing layer 3.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pouch cell, comprising:

an electric core;

the battery cell is coated by the aluminum-plastic film, a sealing part is arranged at the edge of the aluminum-plastic film, and the two sealing parts are mutually contacted and welded into a whole;

and an additional heat seal layer disposed adjacent to the seal portion.

2. The pouch battery according to claim 1, wherein the seal portion and the additional heat seal layer are heat-fused into one body.

3. The pouch cell according to claim 1 or 2, wherein the thickness of the additional heat-sealing layer is 5um to 20um.

4. The pouch battery according to claim 1 or 2, wherein the additional heat-sealing layer is made of a PP material or a CPP material.

5. The pouch battery according to claim 1 or 2, wherein the width of the seal portion is 8mm to 15mm.

6. The laminate battery according to claim 1 or 2, wherein the aluminum-plastic film comprises an outer nylon layer, an intermediate aluminum foil layer and an inner heat-sealing layer which are sequentially overlapped.

7. A packaging device for packaging the pouch battery according to any one of claims 1 to 6.

8. The packaging device according to claim 7, comprising two opposite sealing heads, wherein one side of each sealing head facing the other sealing head comprises a first sealing surface and a second sealing surface forming an angle with the first sealing surface, the first sealing surface is used for welding two sealing parts, and the second sealing surface is used for forming the additional heat sealing layer.