CN215578749U - Packaging structure, laminate polymer battery and battery module - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a packaging structure, a soft package battery and a battery module. The side banding includes first banding section and second banding section, and the one end that first banding section was kept away from to the second banding section is towards the encapsulation main part bending winding and is formed winding structure. The side banding that the encapsulation main part outwards extended includes first banding section and second banding section, and, the distal end portion of keeping away from the second banding section of encapsulation main part is buckled towards the coiling of encapsulation main part, like this, the whole encapsulation length of side banding shortens, can improve the energy density in the unit volume, and, the distal end portion of second banding section can also be accomodate in winding structure, with corresponding protection, reduce the probability that the aluminium foil intermediate level of side banding exposes, prevent it and just, negative pole ear or other external metal direct contact, produce the phenomenon of corruption or short circuit. Meanwhile, the side sealing edge is wound and stored, so that the side structural strength of the packaging structure can be increased.

Description

Packaging structure, laminate polymer battery and battery module

Technical Field

The utility model relates to the technical field of batteries, and particularly provides an encapsulation structure, a soft-package battery with the encapsulation structure and a battery module with the soft-package battery.

Background

In recent years, with the requirement of the endurance mileage of a power automobile being higher and higher, the automobile also puts forward more and more strict requirements on the volume energy density of a lithium ion battery, and the volume energy density of the battery is improved in two aspects, namely, a novel material with high capacity is developed; and secondly, the volume utilization rate of the battery is improved. For the former, a high nickel content cathode or a highly graphitized anode is generally used to increase its energy density; and for the latter, to optimize the structural design of the cell.

On soft package batteries, it has become a trend of lithium ion battery design to reduce or compress unnecessary volume waste as much as possible in design, and generally, soft packages need to be packaged in the manufacturing process, and in order to ensure the strength of the sealing edge, certain requirements can be imposed on the packaging width, and how to compress the part of space and ensure the packaging strength of the battery has become a challenge of many battery manufacturers.

At present, the packaging mode of the existing soft package battery is to perform one-way single folding or one-way double folding on the packaging edge of an aluminum plastic film, so that the packaging reliability of the aluminum plastic film is low, and the quality and safety problems are easy to occur particularly for thin batteries.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a packaging structure, and aims to solve the problem of low reliability of the existing aluminum plastic film packaging structure.

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

in a first aspect, the present application provides a package structure, including the package main part that is used for holding the battery and locate the side banding limit of the terminal side of package main part, the side banding limit is including connecting in the first banding section of package main part and keeping away from the outside extension of one end of package main part by first banding section and forming the second banding section, and the one end that first banding section was kept away from to the second banding section is towards the package main part bending winding and is formed winding structure.

The utility model has the beneficial effects that: the side sealing edge of the packaging main body extending outwards comprises a first sealing edge section and a second sealing edge section, and the far end part of the second sealing edge section far away from the packaging main body is bent towards the packaging main body in a winding mode, so that the whole packaging length of the side sealing edge is shortened, the energy density in unit volume can be improved, and the far end part of the second sealing edge section can be contained in the winding structure to correspondingly protect, reduce the exposure probability of the aluminum foil middle layer of the side sealing edge, and prevent the aluminum foil middle layer from directly contacting with positive and negative electrode lugs or other external metal to generate corrosion or short circuit. Simultaneously, the side banding is convoluteed and is accomodate, can increase packaging structure's side structural strength, improves the shock resistance of self.

In one embodiment, the cross-section of the coiled structure is circular, triangular, square, and irregular.

By adopting the technical scheme, the winding shape of the winding structure can be adjusted according to the actual situation, so that different safety requirements are met.

In one embodiment, the thickness of the winding structure is less than or equal to the thickness of the package body.

Through adopting above-mentioned technical scheme for the whole thickness of side banding is not more than the thickness of encapsulation main part, like this, easy to assemble, and packaging structure's space accounts for than littleer, can obtain higher energy density.

In one embodiment, the number of winding turns of the winding structure is at least one turn.

By adopting the technical scheme, the bending and winding number of the winding structure is selected according to the actual use requirement.

In one embodiment, the end side of the second edge seal segment remote from the first edge seal segment is coated with a layer of insulating glue.

Through adopting above-mentioned technical scheme, the insulating glue film can further prevent the terminal side of second banding section and positive, negative pole ear or other external metal direct contact, produce the phenomenon of corruption or short circuit.

In one embodiment, the second edge seal segment is provided with an adhesive layer.

Through adopting above-mentioned technical scheme, utilize to add the adhesive linkage on the second banding section to guarantee the stability of the coiling shape of winding arrangement.

In one embodiment, the end side of the package body is provided with a heat conductive adhesive, and the package body is adhered to the winding structure through the heat conductive adhesive.

By adopting the technical scheme, the winding structure is connected with the packaging main body by utilizing the heat-conducting colloid, so that the winding shape stability of the winding structure is improved, and the heat dissipation efficiency of the packaging main body is improved.

In one embodiment, the joint of the first edge sealing section and the winding structure is provided with a reinforcing piece.

Through adopting above-mentioned technical scheme, utilize the reinforcement further to improve the intensity of coiling structure, avoid it excessively to buckle and damage after the exogenic action.

In a second aspect, the application further provides a pouch battery, which includes 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 structural strength and strong impact capability.

In a third aspect, the present application further provides a battery module including the above pouch battery.

The utility model has the beneficial effects that: on the basis of the soft package battery, the battery module has longer service life and higher safety and reliability.

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 cross-sectional view of a second edge sealing section of a package structure according to an embodiment of the utility model in an unwound state;

fig. 2 is a cross-sectional view of a second edge sealing section of the package structure in a rolled state according to the embodiment of the utility model;

fig. 3 is another cross-sectional view of a second edge sealing section of the package structure in an unwound state according to the embodiment of the utility model;

fig. 4 is a cross-sectional view of a second edge sealing section of a package structure according to an embodiment of the utility model in an unrolled state;

fig. 5 is another cross-sectional view of the second edge sealing section of the package structure in a rolled state according to the embodiment of the utility model;

fig. 6 is another cross-sectional view of the second edge sealing section of the package structure in a rolled state according to the embodiment of the utility model.

Wherein, in the figures, the respective reference numerals:

the package structure 100, the package body 10, the side sealing edge 20, the first sealing edge section 21, the second sealing edge section 22, the winding structure 20a, the insulating adhesive layer 30, the adhesive layer 40, the thermal conductive adhesive 50, and the reinforcement 60.

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 "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the 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.

In the process of packaging the battery cell, an aluminum-plastic film is adopted for packaging at present, so that under the current condition, a packaging structure is formed on the aluminum-plastic film. Generally, a hole is punched in one of the aluminum-plastic films, the hole is folded and covered by the current aluminum-plastic film, or an additional aluminum-plastic film is used to cover the hole to form a containing space for containing the battery cell, and then the outer edge of the hole is punched to be packaged, so that the packaging main body of the packaging structure is the aluminum-plastic film part containing the battery cell, and the side sealing edge is the aluminum-plastic film part packaged at the outer edge of the packaging main body. The soft package battery formed after the packaging is finished is also required to be stacked and placed in the battery box body, so that the side sealing edge positioned at the outer edge of the packaging main body is easily extruded and impacted, the overall structural strength of the packaging structure is low, and the packaging structure is not beneficial to installation; and, the side seal edge with the excessively long length also occupies extra space in the battery box body, resulting in low energy density of the battery module. In summary, in order to solve the above problems, the present application provides a package structure, which refers to the following embodiments:

referring to fig. 1 and 2, a package structure 100 of the present application includes a package body 10 for accommodating a battery and a side sealing edge 20 disposed at an end side of the package body 10. The side sealing edge 20 includes a first sealing edge section 21 connected to the package body 10 and a second sealing edge section 22 formed by extending an end of the first sealing edge section 21 away from the package body 10, and an end of the second sealing edge section 22 away from the first sealing edge section 21 is bent and rolled toward the package body 10 to form a rolling structure 20 a. It can be understood that the side sealing edge 20 is divided into two parts, namely, a first sealing edge section 21 and a second sealing edge section 22 which are sequentially connected with the package main body 10, and the second sealing edge section 22 is bent and wound towards the package main body 10, so that the overall length of the side sealing edge 20 is further reduced, which is beneficial to reducing the overall length dimension of the pouch cell, and provides for improving the energy density of the battery module, and meanwhile, the wound side sealing edge 20 has higher resistance to external impact, i.e., better reliability.

In the package structure 100 provided by the utility model, the side seal 20 extending outwards from the package main body 10 comprises the first seal section 21 and the second seal section 22, and the distal end part of the second seal section 22 far away from the package main body 10 is bent towards the package main body 10 in a winding manner, so that the overall package length of the side seal 20 is shortened, the energy density in a unit volume can be improved, and the distal end part of the second seal section 22 can be accommodated in the winding structure 20a for corresponding protection, thereby reducing the probability of exposure of the aluminum foil intermediate layer of the side seal 20, and preventing the aluminum foil intermediate layer from directly contacting with positive and negative electrode lugs or other external metals to generate corrosion or short circuit. Meanwhile, the side sealing edge 20 is wound and stored, so that the side structural strength of the package structure 100 can be increased, and the self impact resistance can be improved.

In one embodiment, the cross-section of the winding structure 20a is circular, triangular, square, and irregular. It can be understood that the winding shape of the winding structure 20a can be adjusted according to practical situations, for example, when the cross section of the winding structure 20a is circular, the winding process has no edges and corners, the surface is smooth, and the winding process is simple; or the cross section of the winding structure 20a is square, so that the soft package battery core of the winding structure 20a is higher in fit degree with the inner wall of the battery module, and the stability is better; for another example, the cross-section of the winding structure 20a is irregular, such as irregular polygon, etc., to suit specific installation needs.

Referring to fig. 2, 5 and 6, in an embodiment, the thickness of the winding structure 20a is less than or equal to the thickness of the package body 10. Here, the thickness of the package body 10 refers to the total thickness of the aluminum-plastic film after the cell is packaged. Through adopting above-mentioned technical scheme for the whole thickness of side banding 20 is not more than the thickness of encapsulation main part 10, guarantees that the thickness of encapsulation main part 10 is unanimous, thereby easy to assemble, and packaging structure 100's space accounts for than littleer, can obtain higher energy density.

In one embodiment, the number of bending turns of the winding structure 20a is at least one. It is understood that the number of bending winding turns of the winding structure 20a is selected according to the requirements of actual use. For example, the winding structure 20a may be wound once in the direction of the package body 10, or the winding structure 20a may be wound two or more times in the direction of the package body 10.

Referring to fig. 3, in one embodiment, an end side of the second edge sealing section 22 away from the first edge sealing section 21 is coated with an insulating glue layer 30. It can be understood that the aluminum plastic films all have the aluminum foil layer of the intermediate layer, and on the section of the second edge sealing section 22 far away from the end side of the first edge sealing section 21, the aluminum foil layer is directly exposed, in order to further avoid the phenomenon that the aluminum foil layer at the section is in direct contact with the positive and negative electrode tabs or other external metal to cause corrosion or short circuit, the second edge sealing section 22 is coated with the insulating glue layer 30 for effective isolation.

Referring to fig. 4, in one embodiment, the second edge sealing section 22 is provided with an adhesive layer 40. It can be understood that after the second sealing edge is bent and rolled for several weeks to form the winding structure 20a, the winding structure 20a is in a structure sleeved layer by layer, and since the middle layer of the aluminum-plastic film is an aluminum foil, the winding structure 20a can still maintain a wound state after being bent and rolled, but under certain external force, the winding structure 20a is easily subjected to impact and is scattered, and the structural stability is low. In order to improve the structural stability of the wound structure 20a, the adhesive layer 40 is disposed between the layers of the wound structure 20a, and the adhesive layer 40 can maintain the wound state of each layer, that is, the layers are adhered to each other by the adhesive layer 40, thereby ensuring the structural stability of the whole wound structure 20 a.

Referring to fig. 5, in an embodiment, a thermal conductive adhesive 50 is disposed on an end side of the package body 10, and the package body 10 is adhered to the winding structure 20a through the thermal conductive adhesive 50. Here, the heat conductive colloid 50 has two functions, one is a heat conductive function, after the heat conductive colloid 50 is added, the battery core generates heat when the package main body 10 works, and heat can be dissipated outwards through the first sealing edge and winding structure 20a and the heat conductive colloid 50; secondly, the fixing function, it can be understood that after the winding structure 20a is wound toward the package body 10, the connection is realized through the thermal conductive colloid 50, so that the winding structure 20a can be prevented from being separated toward a direction away from the winding direction, and the structural stability of the winding structure 20a is further improved. That is, the connection between the winding structure 20a and the package body 10 is achieved by the thermal conductive paste 50, so that the winding shape stability of the winding structure 20a is improved, and the heat dissipation efficiency of the package body 10 is improved.

Referring to fig. 6, in one embodiment, a reinforcing member 60 is disposed at a connection portion of the first sealing section 21 and the winding structure 20 a. It can be understood that, after the second edge sealing section 22 is wound to form the winding structure 20a, the connection between the winding structure 20a and the first packaging section is a portion with a large deformation degree, and therefore, the reinforcement member 60 is disposed at this position, so as to prevent the middle aluminum layer of the aluminum-plastic film from being broken due to stress, and especially when the winding structure 20a is impacted by external force, the connection between the two is prevented from being excessively bent under the protection of the reinforcement member 60. Here, the reinforcing member 60 may be a plastic or metal member having a certain bending deformation resistance. And, the reinforcing member 60 may be shaped as a sheet, and is disposed at the connection portion of the first encapsulation section and the winding structure 20a by means of cladding and bonding.

The application also provides a pouch battery, which includes the above-mentioned packaging structure 100.

On the basis of the packaging structure 100, the soft package battery provided by the utility model has higher structural strength and strong impact capacity.

The application also provides a battery module, including foretell laminate polymer battery.

On the basis of the soft package battery, the battery module has longer service life and higher safety and reliability.

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. The utility model provides a packaging structure, includes the encapsulation main part that is used for holding the battery and locates the side banding limit of the terminal side of encapsulation main part which characterized in that: the side banding including connect in the first banding section of encapsulation main part and by first banding section is kept away from the one end of encapsulation main part outwards extends and forms the second banding section, the second banding section is kept away from the one end orientation of first banding section the encapsulation main part is buckled and is convoluteed and form winding structure.

2. The package structure of claim 1, wherein: the cross section of the winding structure is in a circular shape, a triangular shape, a square shape and an irregular shape.

3. The package structure of claim 1, wherein: the thickness of the winding structure is smaller than or equal to that of the packaging main body.

4. The package structure of claim 1, wherein: the number of the bending winding cycles of the winding structure is at least one cycle.

5. The package structure according to any one of claims 1 to 4, wherein: and the end side of the second edge sealing section, which is far away from the first edge sealing section, is coated with an insulating glue layer.

6. The package structure according to any one of claims 1 to 4, wherein: and an adhesive layer is arranged on the second edge sealing section.

7. The package structure according to any one of claims 1 to 4, wherein: the lateral side of the packaging main body is provided with a heat-conducting colloid, and the packaging main body is bonded to the winding structure through the heat-conducting colloid.

8. The package structure according to any one of claims 1 to 4, wherein: and a reinforcing piece is arranged at the joint of the first edge sealing section and the winding structure.

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. A battery module, its characterized in that: comprising the pouch battery according to claim 9.

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