CN218731321U - Battery hem structure and battery - Google Patents

Abstract

The utility model discloses a battery hem structure and a battery, the battery hem structure comprises a battery main body and an encapsulation film, two ends of the encapsulation film are correspondingly provided with hems, the width of each hem is smaller than the thickness of the battery main body, and each hem is sequentially provided with a seal area and an unsealed area; in the unsealed area, the part of each folded edge, which is removed from at least one film layer on one side close to the inner side of the battery main body, is a first folded part; a second folding part is formed at the part of each folding edge in the sealing area; the first folding part is folded to the second folding part and separated from the second folding part through the first bonding layer to form a first bending sealed edge, and after the first bending sealed edge is formed, the second bonding layer is arranged on one side, close to the battery main body, of the second bonding layer and is connected with the battery main body through bending towards the inner side of the battery main body to form a second bending sealed edge; and the thickness of the second bonding layer is greater than the sum of the thicknesses of the first folding part and the first bonding layer, so that the first folding part can not puncture the battery main body in the falling process of the battery.

Description

Battery hem structure and battery

Technical Field

The utility model relates to a battery manufacturing technology field especially relates to a battery hem structure and battery.

Background

With the development of electronic information technology, people have higher and higher requirements on the performance of batteries, and lithium ion batteries are widely applied to the fields of mobile electronic equipment, portable mobile power supplies and the like due to the advantages of high energy density, long cycle life, no memory effect and the like. In the practical application of battery, the battery needs to be stored under the long-term high temperature and high humidity environment, and in order to prevent the battery cell from corroding or contacting with the outside for a short circuit, the battery generally needs to be packaged in a soft package mode, and at present, the battery is packaged in a soft package mode by adopting a flanging packaging process.

However, in the soft package of the battery, when the battery falls, the conventional folded edge structure is likely to puncture the battery body to cause liquid leakage, gas expansion and the like, thereby affecting the service performance of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at, the technical problem of battery subject is punctureed easily to hem structure when solving the battery and falling.

In order to solve the technical problem, an embodiment of the utility model provides a battery hem structure has adopted as follows technical scheme:

this battery hem structure includes:

a battery main body;

an encapsulation film having at least two film layers; when the packaging film is used for coating and packaging the battery main body, folded edges are reserved at two ends of the packaging film correspondingly on two sides of the battery main body, and the width of each folded edge is smaller than the thickness of the battery main body;

a seal area and an unsealed area are sequentially formed on each folded edge in the direction far away from the battery main body; in the unsealed area, the part of each folded edge, which is obtained by removing at least one film layer on one side close to the inner side of the battery main body, is a first folded part; the part of each folded edge in the seal area is a second folded part;

after a first bonding layer is formed on the first folding part and/or the second folding part, the first folding part is folded to the second folding part and is separated from the second folding part through the first bonding layer to form a first bending edge seal; after the first bending edge sealing is formed, a second bonding layer is arranged on one side, close to the battery main body, of the second bending part, and the second bending part is connected with the battery main body through bending towards the inner side of the battery main body to form a second bending edge sealing;

the thickness of the second adhesive layer is greater than the sum of the thicknesses of the first fold and the first adhesive layer.

Further, in a preferable mode of some embodiments, the first adhesive layer is disposed on a surface of the second fold portion adjacent to an inner side of the battery main body, and the first adhesive layer and the second adhesive layer are connected.

Further, in some embodiments, the first adhesive layer has a thickness of 0.02mm to 0.3mm.

Further, in some embodiments, the second adhesive layer has a thickness of 0.02mm to 0.3mm.

Further, in some embodiments, the width of the unsealed area is smaller than the width of the sealed area, and the width of the first fold is smaller than the width of the first adhesive layer.

Further, in some preferred embodiments, the width of the seal area is greater than or equal to 0.6mm.

Further, in a preferable mode of some embodiments, the sealing film has two film layers, and the first fold is a single film formed by removing one film layer from a side of the folded edge near the inner side of the battery main body.

Further, in a preferable scheme of some embodiments, the first adhesive layer and the second adhesive layer are both adhesive layers formed after the adhesive is dripped and cured.

Further, in a preferred version of some embodiments, the first hem seal is parallel to the second hem seal; the second folded portion after being folded is arranged along the thickness direction of the battery main body.

In order to solve the above technical problem, an embodiment of the present invention further provides a battery, which adopts the following technical solution: the battery comprises the battery folding structure.

Compared with the prior art, the embodiment of the utility model provides a battery hem structure and battery mainly have following beneficial effect:

this battery hem structure passes through behind the encapsulation membrane encapsulation battery main part, the both ends of encapsulation membrane correspond the hem edge of leaving in battery main part both sides and form first book portion and second book portion, wherein, first book portion is folded to the second book portion, and separate through first tie coat and second book portion, in order to be formed with the first banding of buckling, make first book portion can wrap up the edge that the second folded the portion, can reduce the infiltration of outside steam, do benefit to the storage performance who improves the battery in the high temperature and high humidity environment, in order to improve the safety in utilization of battery. In addition, the second folding part is bent towards the inner side of the battery main body and is connected with the battery main body through a second bonding layer to form a second bent sealing edge, so that the width of the battery is reduced, and the width consistency of the battery is improved. And the thickness of the second bonding layer is greater than the sum of the thicknesses of the first folding part and the first bonding layer, so that the first folding part is separated from the battery main body in the width direction of the battery main body by the second bonding layer to form a gap, and therefore, in the falling process of the battery, the end part of the first folding part of the battery folding structure can be abutted to the second bonding layer and cannot contact the battery main body under the conditions of descending or shaking and the like, the battery main body cannot be punctured, the situations that the battery folding structure punctures the battery main body to cause liquid leakage, gas expansion and the like of the battery can be avoided, the safety of the battery is ensured, the production quality of the battery is favorably improved, and the stable reliability of the structure of the battery is ensured.

Drawings

In order to illustrate the solution of the present invention more clearly, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts. Wherein:

fig. 1 is a plan cut-away view of a battery crimping structure in an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the battery of FIG. 1 at A;

FIG. 3 is a schematic plan view of the packaging film encapsulating the cell body in the folded configuration of the cell of FIG. 1;

FIG. 4 is a schematic plan view of the battery of FIG. 1 after the film layer has been cut;

fig. 5 is a schematic plan view of the folding of the first fold to the second fold in the battery folding structure of fig. 1.

The reference numbers in the drawings are as follows:

100. a battery folding structure;

1. a battery main body;

2. packaging the film; 21. folding edges; 211. a sealing area; 212. an unsealed area; 213. a first fold portion; 214. a second fold; 215. a first adhesive layer; 216. a second adhesive layer; 217. first bending and edge sealing; 218. and a second bending edge sealing.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, for example, the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or position illustrated in the drawings, which are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof in the description and claims of the invention and the description of the foregoing figures, are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The meaning of "plurality" is two or more unless specifically limited otherwise.

In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the utility model provides a battery hem structure 100, as shown in fig. 1, this battery hem structure 100 includes battery main part 1 and packaging film 2, wherein, packaging film 2 has at least two-layer rete, and packaging film 2 when cladding encapsulation battery main part 1, the both ends of packaging film 2 correspond in battery main part 1's both sides and reserve has hem 21, the width of hem 21 is less than battery main part 1's thickness, so that packaging film 2 seals up the setting in hem 21 department after encapsulation battery main part 1.

In the present embodiment, as shown in fig. 1 to 5, each of the folded edges 21 is formed with a sealed region 211 and an unsealed region 212 in order in a direction away from the battery body 1, and in the unsealed region 212, a portion of each of the folded edges 21 where at least one of the film layers is removed on a side close to the inside of the battery body 1 is a first folded portion 213, and a portion of each of the folded edges 21 in the sealed region 211 is a second folded portion 214. Wherein, when the first bonding layer 215 is formed on the first folding portion 213 or the second folding portion 214, or the first bonding layer 215 is formed on both the first folding portion 213 and the second folding portion 214, the first folding portion 213 is folded to the second folding portion 214 and separated from the second folding portion 214 by the first bonding layer 215 to form the first bending edge seal 217, after the first bending edge seal 217 is formed, the second folding portion 214 is provided with the second bonding layer 216 on a side close to the battery body 1 and is connected to the battery body 1 by bending toward the inner side of the battery body 1 to form the second bending edge seal 218, and the thickness of the second bonding layer 216 is greater than the sum of the thicknesses of the first folding portion 213 and the first bonding layer 215, so that the first folding portion 213 in the battery folding edge 21 structure 100 is not in contact with the battery body 1, thereby preventing the first folding portion 213 from piercing the battery body 1 during the falling of the battery (not shown), which may cause the leakage and the gas expansion of the battery body 1, and thereby preventing the working performance of the battery 1 from being affected by the badness.

Specifically, in the present embodiment, as shown in fig. 5, when the first bonding layer 215 is formed on the side of the first fold portion 213 or the second fold portion 214 close to the inner side of the battery main body 1, or the first bonding layer 215 is formed on both the side of the first fold portion 213 and the side of the second fold portion 214 close to the inner side of the battery main body 1, the first fold portion 213 is folded to the second fold portion 214 along the edge of the second fold portion 214, so that the first fold portion 213 wraps the edge of the second fold portion 214, that is, the first fold portion 213 wraps the edge of the seal region 211. In addition, first folding portion 213 is separated from second folding portion 214 through first bonding layer 215, and first folding portion 213 is folded to second folding portion 214 through first bonding layer 215, makes the leakproofness better between first folding portion 213 and the second folding portion 214, does benefit to the infiltration that reduces outside steam, thereby has improved the storage performance of battery in the environment of high temperature and high humidity, with the safety in utilization that has improved the battery.

In summary, compared with the prior art, the battery folding structure 100 has at least the following beneficial effects: after the first bending sealing edge 217 is formed in the battery folding structure 100, the second folding portion 214 is provided with a second adhesive layer 216 on a side close to the battery main body 1 and is connected with the battery main body 1 by bending toward the inner side of the battery main body 1 to form a second bending sealing edge 218, and in addition, the thickness of the second adhesive layer 216 is greater than the sum of the thicknesses of the first folding portion 213 and the first adhesive layer 215. Thus, in one aspect, the structure 100 of the battery hem 21 facilitates reducing the width of the battery and improving the uniformity of the width of the battery by providing the first bending edge seal 217 and the second bending edge seal 218. On the other hand, the thickness of the second adhesive layer 216 arranged on the battery folding structure 100 is greater than the sum of the thicknesses of the first folding portion 213 and the first adhesive layer 215, so that the first folding portion 213 is not in contact with the battery main body 1, the situation that the battery can puncture the battery main body 1 by the first folding portion 213 in the falling process can be avoided, and the first folding portion 213 is folded to the second folding portion 214, so that the first folding portion 213 wraps the sealing area 211, the permeation of external water vapor into the battery main body 1 is reduced, the storage performance of the battery in a high-temperature and high-humidity environment can be improved, and the safety use performance of the battery can be improved.

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 5.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 1 and fig. 2, in order to enhance the sealing performance of the battery folding structure 100, the first bonding layer 215 is disposed on one side of the second folding portion 214 close to the inner side of the battery main body 1, wherein the first bonding layer 215 is connected to the second bonding layer 216, so that the second folding portion 214 is surrounded by the first bonding layer 215 and the second bonding layer 216 at the side close to the inner side of the battery main body 1, so that substances such as moisture of external substances cannot enter the inside of the second folding portion 214 from the inside of the first bonding layer 215, thereby avoiding affecting the working performance of the battery main body 1, improving the sealing performance of the battery folding structure 100, and improving the packaging capacity of the packaging film 2 for the battery main body 1.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 5, in order to reduce the overall width of the battery main body 1 after the package is completed as much as possible, the thickness of the first bonding layer 215 is 0.02mm to 0.3mm, so that the thickness of the first bending sealing edge 217 is not too thick, which is beneficial to controlling the overall width of the battery main body 1 after the package is completed.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 2, for further controlling the overall width of the battery main body 1 after the package is completed, the thickness of the second bonding layer 216 is 0.02 mm-0.3 mm, so as to ensure that the sealing performance of the battery main body 1 is good, and at the same time, avoid the width of the battery main body 1 after the package is too wide, thereby facilitating the reduction of the width of the battery and saving the production cost of the battery.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 2 and fig. 5, in order to prevent the first folding portion 213 in the battery folding structure 100 from piercing the battery main body 1, the width of the unsealed area 212 is smaller than the width of the sealed area 211, and the width of the first folding portion 213 is smaller than the width of the first adhesive layer 215, so that after the second folded sealing edge 218 is connected with the battery main body 1 through the second adhesive layer 216, the height of the first folded sealing edge 217 does not exceed the thickness of the battery main body 1, that is, the thickness of the battery folding 21 structure 100 does not exceed the thickness of the battery main body 1, so that the overall thickness of the battery is not too thick, which is convenient for the use of the battery, and at the same time, the appearance of the battery is more beautiful.

Further, as a specific implementation among some embodiments of the utility model, for improving battery hem structure 100 to battery subject 1's leakproofness, the width of seal district 211 is more than or equal to 0.6mm for can avoid the steam in the external environment to pass through inside seal district 211 gets into battery subject 1, with improve packaging film 2 to battery subject 1's packaging capacity, can be with the sealing performance who improves battery subject 1, thereby can reduce the influence of external environment to battery subject 1 working property.

It can be understood that the width of the sealing region 211 is less than the thickness of the battery body 1, so that the height of the second bending sealing edge 218 of the battery folding structure 100 can be prevented from exceeding the thickness of the battery body 1, and thus the thickness of the battery is not too thick, which is convenient for the use of the battery in operation.

Further, as a specific embodiment of some embodiments of the present invention, as shown in fig. 3 and 4, in order to facilitate handling of the folded edge 21 of the packaging film 2 left on both sides of the battery body 1 after packaging the battery body 1, the packaging film 2 has two layers of films, wherein the first folded portion 213 is a single-layer film formed by removing one film layer from one side of the folded edge 21 near the inner side of the battery body 1, so that the first folded portion 213 is folded onto the second folded portion 214.

Specifically, in the present embodiment, the encapsulating film 2 is preferably an aluminum plastic film. The material of individual layer plastic-aluminum membrane is softer, and first book portion 213 separates through first tie coat 215 and second book portion 214, and at the processing of follow-up hem 21, first book portion 213 becomes a whole with battery body 1 for when the battery falls, battery body 1 can be kept away from to first book portion 213, thereby can not cause the hidden danger that punctures battery body 1 and lead to battery body 1 weeping, flatulence. In addition, when the first folding portion 213 is folded to the second folding portion 214, the first folding portion 213 is bent towards the inner side of the battery body 1 along the edge of the second folding portion 214, so that when the first folding portion 213 is folded to the second folding portion 214, the first folding portion 213 wraps the second folding portion 214, that is, the first folding portion 213 wraps the sealing region 211, the sealing performance of the sealing region 211 is further improved, and the moisture in the external environment is prevented from permeating into the battery body 1, so that the working safety of the battery body 1 is improved.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 2, in order to improve the stability of the battery folding structure 100, the first adhesive layer 215 and the second adhesive layer 216 are adhesive layers formed after curing the adhesive, so that the structures of the first bending edge banding 217 and the second bending edge banding 218 can be kept stable, and the structure of the battery folding structure 100 is stable.

Understandably, the adhesive layer has a certain insulating property, so that the phenomenon of short circuit caused by the contact between the battery main body 1 and the external environment can be avoided, the working performance of the battery main body 1 can be further protected, and the use safety of the battery can be improved.

Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 2 and 5, to enhance the sealing performance of the battery folding structure 100, the first bending sealing edge 217 is parallel to the second bending sealing edge 218, so that the first folding portion 213 of the first bending sealing edge 217 can seal the edge of the sealing area 211 to enhance the sealing performance of the sealing area 211, and reduce the permeation of external water vapor, thereby enhancing the sealing performance of the battery folding structure 100. In addition, the second folded part 214 after being folded is arranged along the thickness direction of the battery body 1, which is beneficial to reducing the whole width of the battery folding structure 100.

Specifically, in this embodiment, the second bending sealing edge 218 is formed by vertically bending the first bending sealing edge 217 and the second adhesive layer 216 disposed on the second folding portion 214 and near one side of the battery main body 1 toward the inside of the battery main body 1, so that the overall width of the battery folding edge 21 structure 100 is not too large, which is beneficial to saving production materials and saving production cost, and meanwhile, the first bending sealing edge 217 is also not in direct contact with the battery main body 1, thereby preventing the first folding portion 213 in the first bending sealing edge 217 from puncturing the battery main body 1, so that the packaging performance of the battery main body 1 is better, and the working performance of the battery main body 1 is protected.

Based on the above-mentioned battery hem structure, the embodiment of the present invention further provides a battery (not shown), wherein the battery includes the above-mentioned battery hem structure 100.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A battery hem structure, comprising:

a battery main body;

an encapsulation film having at least two film layers; when the packaging film is used for coating and packaging the battery main body, folded edges are reserved at two ends of the packaging film correspondingly on two sides of the battery main body, and the width of each folded edge is smaller than the thickness of the battery main body;

a seal area and an unsealed area are sequentially formed on each folded edge in the direction far away from the battery main body; in the unsealed area, the part of each folded edge, which is obtained by removing at least one film layer on one side close to the inner side of the battery main body, is a first folded part; the part of each folded edge in the sealing area is a second folded part;

after a first bonding layer is formed on the first folding part and/or the second folding part, the first folding part is folded to the second folding part and is separated from the second folding part through the first bonding layer to form a first bending edge seal; after the first bending edge sealing is formed, a second bonding layer is arranged on one side, close to the battery main body, of the second bending part, and the second bending part is connected with the battery main body through bending towards the inner side of the battery main body to form a second bending edge sealing;

the thickness of the second adhesive layer is greater than the sum of the thicknesses of the first fold and the first adhesive layer.

2. The battery edge folding structure according to claim 1, wherein the first adhesive layer is provided on a surface of the second fold portion adjacent to the inside of the battery main body, and the first adhesive layer is attached to the second adhesive layer.

3. The battery hem structure of claim 2, wherein the first adhesive layer has a thickness of 0.02mm to 0.3mm.

4. The battery hem structure of claim 2, wherein the second adhesive layer has a thickness of 0.02mm to 0.3mm.

5. The battery hem structure of claim 1, wherein the unsealed area has a width less than a width of the sealed area, and the first fold has a width less than a width of the first adhesive layer.

6. The battery folding structure according to claim 1, wherein the width of the seal area is greater than or equal to 0.6mm.

7. The battery tab construction of claim 1 wherein the packaging film has two film layers and the first fold is a single film formed by removing one of the film layers from the side of the tab adjacent the inside of the battery body.

8. The battery hem structure of claim 7, wherein the first and second adhesive layers are both layers of glue formed after the glue is dripped and cured.

9. The battery hem structure of claim 7, wherein the first hem seal is parallel to the second hem seal; the second folded portion after being folded is arranged along the thickness direction of the battery main body.

10. A battery comprising a battery crimping structure according to any one of claims 1 to 9.

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