CN215816059U - Packaging structure and laminate polymer battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides an encapsulation structure and a soft package battery, wherein the encapsulation structure comprises an encapsulation film body, the encapsulation film body forms an encapsulation shell with an opening end through stamping, the encapsulation shell comprises a first side wall, a second side wall and a transition side wall, the first side wall and the second side wall are oppositely arranged, the transition side wall is used for connecting the adjacent first side wall and the second side wall, the first side wall, the transition side wall and the second side wall form an angle structure in a surrounding mode, an included angle a is formed between the transition side wall and the first side wall, an included angle b is formed between the transition side wall and the second side wall, and the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is smaller than or equal to 90 degrees. Like this, be the transition structural style of right angle or fillet with original first lateral wall and second lateral wall, change the transition structural style of transition lateral wall into, like this, improved the angular position structure of encapsulation casing tensile deformation big problem when the shaping, also weakened the closed angle effect of angular position structure in addition, simultaneously, also improve the intensity of angular position structure department, avoided stress concentration promptly.

Description

Packaging structure and laminate polymer battery

Technical Field

The utility model relates to the technical field of batteries, and particularly provides a packaging structure.

Background

The lithium battery has the characteristics of high energy density, high voltage, small volume, environmental protection and the like, so that the lithium battery is widely applied to mobile electronic products, the safety of the lithium battery is always the most concerned point in the use process of people, and therefore, a packaging bag of the lithium battery must strictly meet the requirements of water resistance, corrosion resistance, insulation and the like of a battery core. The existing soft package lithium ion battery is mostly packaged by adopting an aluminum plastic film, a packaging material is stretched and deformed by pre-punching die forming to obtain a corresponding punching pit structure, and then naked electric core packaging is carried out. In the process of punch forming of the aluminum-plastic film, if a punching die is not properly designed, the thinning is also the most serious due to the maximum stress borne by the corner position, and the corner position is damaged due to the fact that the aluminum layer at the corner position is too much stretched, so that the battery has safety risks.

Most of the existing punching pits of the aluminum-plastic film are square, and one arc angle transition (the radius of the arc angle is generally 1 mm-2 mm) is adopted at the corner position of the punching pit. In application, the problems of shell damage, liquid leakage, deformation of the top corner position, poor shell insulation and the like are easily caused at the corner position.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a packaging structure, and aims to solve the problem that the corner position of the conventional packaging structure is easy to deform and even damage.

In order to achieve the purpose, the utility model adopts the technical scheme that:

in a first aspect, the application provides an encapsulation structure, including the encapsulation film body, the encapsulation film body forms the encapsulation casing that has the open end through the punching press, the encapsulation casing includes relative first lateral wall and the second lateral wall that sets up, and be used for connecting the transition lateral wall of adjacent first lateral wall and second lateral wall, first lateral wall, transition lateral wall and second lateral wall enclose and form the angular position structure, be contained angle a between transition lateral wall and the first lateral wall, be contained angle b between transition lateral wall and the second lateral wall, the supplementary angle sum of contained angle a and contained angle b is less than or equal to 90.

The utility model has the beneficial effects that: according to the packaging structure provided by the utility model, the packaging film body forms the concave pit on the packaging film body in a punch forming mode, and the original plane structure becomes a three-dimensional packaging shell. Meanwhile, the circumferential side wall of the packaging shell is formed by enclosing two first side walls, two second side walls and transition side walls, wherein the transition side walls connect the adjacent first side walls and the second side walls to form an angle structure, and thus, the original transition structure form that the first side walls and the second side walls are right angles or round angles is changed into the transition structure form that the transition side walls are added between the first side walls and the second side walls, namely, the sum of the supplementary angles of the included angle a and the supplementary angles of the included angle b is less than or equal to 90 degrees, so that the problem that the stretching deformation of the angle structure of the packaging shell is large during molding is solved, the sharp angle effect of the angle structure is weakened, meanwhile, the strength of the angle structure is improved, and stress concentration is avoided.

In one embodiment, the sum of the complement of angle a and the complement of angle b equals 90 °.

Through adopting above-mentioned technical scheme, can understand ground, the quantity of transition lateral wall is one to, the one end of transition lateral wall is connected in first lateral wall, and the other end connects in the second lateral wall, like this, optimizes the angular position structure for the secondary transition, has avoided the stress concentration that a transition caused.

In one embodiment, the included angle a is equal to 135 °; the angle b is equal to 135 deg..

By adopting the technical scheme, the first side wall and the second side wall are in a symmetrical structure at the center of the transition side wall.

In one embodiment, the transitional side wall includes at least two sub-side walls connected in sequence side by side, and two adjacent sub-side walls form an included angle with each other, a first sub-side wall is connected to the first side wall and forms an included angle a with the first side wall, a last sub-side wall is connected to the second side wall and forms an included angle b with the second side wall, and the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is less than 90 °.

By adopting the technical scheme, the transition side wall is formed by connecting a plurality of sub side walls, namely the angle structure is optimized into more than two transitions, so that the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is less than 90 degrees.

In one embodiment, two adjacent sub-sidewalls are connected by a circular arc transition.

By adopting the technical scheme, the connection of two adjacent sub side walls is reduced to form a sharp-angled structure, and stress concentration is effectively avoided.

In one embodiment, the length L of the transition side wall in the extension direction of the first side wall or the second side wall is 5mm to 15 mm.

Through adopting above-mentioned technical scheme, guarantee the suitable size range of transition lateral wall to have its functionality concurrently, and guarantee enough accommodation space, with the energy density of guaranteeing electric core.

In one embodiment, the package housing has at least one angular position structure.

By adopting the technical scheme, the number of the angle structure is selected according to actual needs so as to realize corresponding use requirements.

In one embodiment, the package housing has two angular position structures, and the two angular position structures are disposed on the same side.

By adopting the technical scheme, in the packaging structure, one packaging body is folded in half and then packaged, so that only one side of the packaging structure is provided with the angular position structure.

In a second aspect, the present application provides a pouch battery, including the above package structure.

The utility model has the beneficial effects that: on the basis of the packaging structure, the soft package battery provided by the utility model has higher overall strength.

In one embodiment, the pouch battery includes a bare cell disposed in the encapsulation structure, and the bare cell has a corner cutting structure corresponding to the corner position structure of the encapsulation structure.

Through adopting above-mentioned technical scheme, the preparation has the naked electric core of corner cut structure to adapt to packaging structure's accommodation space to ensure the energy density of naked electric core.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a front view of a package structure according to an embodiment of the utility model;

fig. 2 is a left side view of a package structure according to an embodiment of the utility model;

fig. 3 is a partially enlarged view of a corner structure of a package structure according to an embodiment of the utility model;

fig. 4 is a partially enlarged view of a corner structure of a package structure according to another embodiment of the utility model;

fig. 5 is a front view of a soft-package battery cell provided in an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

100. a packaging structure; 10. an encapsulation film body; 20. a package housing; 21. a first side wall; 22. a second side wall; 23. a transition sidewall; 231. a sub-sidewall; 24. an angular position structure; 200. and (5) corner cutting structure.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 3, the present application provides a package structure 100, which includes a package film body 10, where the package film body 10 is a sheet-shaped structure, and needs to be formed into a three-dimensional structure with a receiving cavity by stamping, that is, a package housing 20, and generally, the package structure 100 is formed by folding a piece of package film body 10 in half and then packaging, or formed by covering two pieces of package film bodies 10 with each other and then packaging, so that the portion with the receiving space is the package housing 20. The encapsulation film body 10 is formed into an encapsulation case 20 having an open end by punching. The package housing 20 includes a first sidewall 21 and a second sidewall 22 disposed opposite to each other, and a transition sidewall 23 for connecting the adjacent first sidewall 21 and second sidewall 22. Here, the first side wall 21, the second side wall 22, and the transition side wall 23 refer to portions that form a space surrounded by the circumferential direction of the package case 20, and do not refer to the bottom. The first side wall 21, the transition side wall 23 and the second side wall 22 enclose to form an angular position structure 24, an included angle a is formed between the transition side wall 23 and the first side wall 21, an included angle b is formed between the transition side wall 23 and the second side wall 22, and the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is less than or equal to 90 degrees. Understandably, the included angle a and the included angle b are both larger than 90 degrees, so that the angle mechanism is formed through secondary transition at least, and the problems of stress concentration and low structural strength caused by original primary transition are avoided.

In the package structure 100 of the present invention, the package film body 10 is formed by press forming, so that the recess is formed in the package film body 10, and the original planar structure becomes the three-dimensional package case 20. Meanwhile, the circumferential side wall of the package housing 20 is enclosed by two first side walls 21, two second side walls 22 and a transition side wall 23, wherein the transition side wall 23 connects the adjacent first side wall 21 and the second side wall 22 to form an angle structure 24, thus, the original transition structure form that the first side wall 21 and the second side wall 22 are right-angled or rounded is changed into the transition structure form that the transition side wall 23 is added between the first side wall 21 and the second side wall 22, namely the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is less than or equal to 90 degrees, namely the supplementary angles and the included angle b form an obtuse transition structure, thus, the amount of tensile deformation of the corner structure 24 of the package housing 20 during molding is reduced, the tensile thickness thereof is increased, in addition, the sharp angle effect of the angular structure 24 is weakened, and simultaneously, the strength of the angular structure 24 is improved, namely, stress concentration is avoided.

In one embodiment, the sum of the complement of angle a and the complement of angle b equals 90 °. Here, the included angle a and the included angle b may be equal or unequal, and are selected according to specific actual requirements.

By adopting the above technical solution, please refer to fig. 3, in the present embodiment, the number of the transition side walls 23 is one, that is, one end of the transition side wall 23 is connected to the first side wall 21, and the other end is connected to the second side wall 22, so that the corner structure 24 has a first transition connection at one connection of the first side wall 21 and the transition side wall 23, and a second transition connection at the other connection of the second side wall 22 and the transition side wall 23, that is, the corner structure 24 is optimized to be a second transition, thereby avoiding stress concentration caused by the first transition. Preferably, one of the joints between the first side wall 21 and the transition side wall 23 is in arc transition, and the radius of the arc is 1 mm-2 mm; and the other joint of the second side wall 22 and the transition side wall 23 is also in arc transition, and the radius of the arc is 1 mm-2 mm.

In one embodiment, the included angle a is equal to 135 °; the angle b is equal to 135 deg..

By adopting the above technical solution, please refer to fig. 3, the first sidewall 21 and the second sidewall 22 are symmetrical with respect to the center of the transition sidewall 23. That is, the first side wall 21 and one end of the transition side wall 23 form a reinforcing rib, and the second side wall 22 and the other end of the transition side wall 23 also form a reinforcing rib, and the two reinforcing ribs are stacked, so that the formed angular structure 24 can bear larger impact, i.e. the strength is higher.

Referring to fig. 4, in an embodiment, the transition side wall 23 includes at least two sub-side walls 231 connected in parallel in sequence, and two adjacent sub-side walls 231 form an included angle with each other, a first sub-side wall 231 is connected to the first side wall 21 and forms an included angle a with the first side wall 21, a last sub-side wall 231 is connected to the second side wall 22 and forms an included angle b with the second side wall 22, and a sum of a complement angle of the included angle a and a complement angle of the included angle b is less than 90 °.

By adopting the above technical solution, the transition side wall 23 is formed by connecting a plurality of sub side walls 231, and two adjacent sub side walls 231 form an included angle with each other, that is, the angular position structure 24 is optimized to be a transition of more than two times, except that the first side wall 21 and one end of the first sub side wall 231 form a reinforcing edge, and the second side wall 22 and one end of the last sub side wall 231 form a reinforcing edge, the joint of each adjacent sub side wall 231 also forms a reinforcing edge, thereby further improving the strength of the angular position structure 24.

In one embodiment, two adjacent sub-sidewalls 231 are connected by a circular arc transition.

By adopting the technical scheme, the connection of two adjacent sub side walls 231 is reduced to form a sharp-angled structure, and stress concentration is effectively avoided.

In one embodiment, the length L of the transition side wall 23 in the extension direction of the first side wall 21 or the second side wall 22 is 5mm to 15 mm.

By adopting the above technical scheme, after the included angle a and the included angle b are defined, the length L of the transition side wall 23 in the extending direction of the first side wall 21 or the second side wall 22 is defined, that is, the length specification of the transition side wall 23 can be finally defined. And, through determining the appropriate size range of the transition side wall 23, the angular position structure 24 has the functionality thereof, and at the same time, the accommodating space of the package casing 20 is not reduced, so as to ensure the energy density of the battery cell. Specifically, the length L of the transition side wall 23 along the extension direction of the first side wall 21 or the second side wall 22 may be an integer value such as 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, or the like, or may be a decimal value.

In one embodiment, the package housing 20 has at least one angular position structure 24. Typically, the number of angular position structures 24 is one to four. Of course, if the bare cell with the special-shaped structure is present, the number of the angular position structures 24 may also be increased.

By adopting the technical scheme, the number of the angle structures 24 is selected according to actual needs so as to realize corresponding use requirements. For example, the package housing 20 has four corner structures 24, in this case, two package film bodies 10 are covered with each other, and therefore, at least one package film body 10 is punched to form a punching pit.

In one embodiment, the package housing 20 has two corner structures 24, and the two corner structures 24 are disposed on the same side.

By adopting the above technical solution, in this case, the package structure 100 has one package body folded in half and then packaged, and therefore, only one side of the package structure 100 has the above-mentioned corner structure 24.

In a second aspect, please refer to fig. 5, the present application provides a pouch battery, including the package structure 100 described above.

On the basis of the packaging structure 100, the soft package battery provided by the utility model has higher overall strength.

In one embodiment, the pouch battery includes a bare cell disposed in the packaging structure 100, and the bare cell has a corner cutting structure 200 corresponding to the corner position structure 24 of the packaging structure 100.

Through adopting above-mentioned technical scheme, the naked electric core that makes to have corner cut structure 200 adapts to packaging structure 100's accommodation space to ensure the energy density of naked electric core.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An encapsulation structure, includes the encapsulation membrane body, the encapsulation membrane body forms the encapsulation casing that has the open end through the punching press, its characterized in that: the packaging shell comprises a first side wall and a second side wall which are oppositely arranged, and is used for connecting the adjacent first side wall and a transition side wall of the second side wall, the first side wall, the transition side wall and the second side wall form a corner structure in a surrounding mode, the transition side wall and the first side wall form an included angle a, the transition side wall and the second side wall form an included angle b, and the supplementary angle of the included angle a and the supplementary angle sum of the included angle b are smaller than or equal to 90 degrees.

2. The package structure of claim 1, wherein: the sum of the supplementary angle of the included angle a and the supplementary angle of the included angle b is equal to 90 degrees.

3. The package structure of claim 2, wherein: said angle a is equal to 135 °; said angle b is equal to 135 °.

4. The package structure of claim 1, wherein: the transition lateral wall is including two at least sub-lateral walls that connect side by side in proper order, just, adjacent two sub-lateral wall is the contained angle each other, and is first sub-lateral wall connect in first lateral wall and with be between the first lateral wall contained angle a, the end sub-lateral wall connect in second lateral wall and with be between the second lateral wall contained angle b, contained angle a's supplementary angle with contained angle b's supplementary angle sum is less than 90.

5. The package structure of claim 4, wherein: and two adjacent sub side walls are in transition connection through arcs.

6. The package structure according to claim 2 or 3, wherein: the length L of the transition side wall along the extension direction of the first side wall or the second side wall is 5 mm-15 mm.

7. The package structure of claim 1, wherein: the packaging shell is provided with at least one angle position structure.

8. The package structure of claim 7, wherein: the packaging shell is provided with two angle position structures, and the two angle position structures are arranged on the same side.

9. The utility model provides a laminate polymer battery which characterized in that: comprising a package structure according to any of claims 1 to 8.

10. The pouch cell according to claim 9, wherein: the soft package battery comprises a naked battery cell arranged in the packaging structure, and the naked battery cell is provided with a corner cutting structure corresponding to the corner position structure of the packaging structure.

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