Packaging structure and battery

Abstract

The utility model provides a packaging structure and a battery, the packaging structure comprises a first packaging film and a second packaging film, the first packaging film comprises a first groove and a first sealing edge, and at least three sides of the first sealing edge are distributed around the first groove; the second packaging film is connected with the first packaging film, the second packaging film comprises a second groove and a second sealing edge, and at least three sides of the second sealing edge are distributed around the second groove; a containing cavity is defined by the first groove and the second groove, the first sealing edge and the second sealing edge are connected to define an edge sealing area, the edge sealing area comprises a first sealing area and a second sealing area, the first sealing area is located on the side, close to the containing cavity, of the second sealing area, and the thickness of the first sealing area is larger than that of the second sealing area in the first direction. The battery comprises the battery cell and the packaging structure, wherein the battery cell is positioned in the accommodating cavity. According to the packaging structure and the battery, the safety can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a packaging structure and a battery. BACKGROUND

[0002] The aluminum plastic film is used for packaging the battery cell to avoid leakage of electrolyte and block contact of moisture and oxygen and other substances in the environment with the battery cell. However, in a high-temperature environment, the battery cell will generate a large amount of gas to cause the accommodation cavity of the aluminum plastic film to swell and pressurize until the aluminum plastic film is damaged, which will cause a large impact. In addition, the battery cell generates gas while releasing heat. With the accumulation of heat, there is a risk of smoking and fire, which is difficult to ensure the safety of the battery. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a packaging structure which can improve the safety of the battery.

[0004] The present application also provides a battery with the above packaging structure.

[0005] According to the packaging structure of the present application, the packaging structure comprises a first packaging film and a second packaging film;

[0006] The first packaging film comprises a first recess and a first sealing edge, and the first sealing edge is distributed around the first recess on at least three sides;

[0007] The second packaging film is connected with the first packaging film, and the second packaging film comprises a second recess and a second sealing edge, and the second sealing edge is distributed around the second recess on at least three sides;

[0008] The first recess and the second recess enclose an accommodation cavity, the first sealing edge and the second sealing edge define a sealing edge region, the sealing edge region comprises a first sealing area and a second sealing area, the first sealing area is located on the side of the second sealing area close to the accommodation cavity, and along the first direction, the thickness of the first sealing area is greater than the thickness of the second sealing area.

[0009] According to the packaging structure of the present application, the accommodation cavity is used to accommodate the battery cell, the first sealing area is thicker than the second sealing area, that is, the first sealing area is used to correspond to the recess of the packaging mold during packaging, so that the degree of compression of the first sealing area is less than that of the second sealing area, and then the sealing strength of the first sealing area is less than that of the second sealing area. In addition, the first sealing area is located on the side of the second sealing area close to the accommodation cavity, and the first sealing area is used to break through first, and then the second sealing area adjacent to the first sealing area is broken through, so as to gradually break through the sealing edge region, and the breaking process is more moderate, which effectively avoids excessive accumulation of gas and heat in the accommodation cavity, reduces the risk of explosion and smoking and fire, and is beneficial to improve the safety of the battery.

[0010] According to some embodiments of the present application, the packaging structure comprises a first side, a second side, a third side and a fourth side connected in sequence, the first side is arranged opposite to the third side along a second direction, the second side is arranged opposite to the fourth side along a third direction, the first packaging film is connected to the second packaging film at the first side, the first sealing edge and the second sealing edge are connected at the second side, the third side and the fourth side to form a sealing edge area, the first direction, the second direction and the third direction are perpendicular to each other in pairs;

[0011] The third side is used for leading out a tab, and the first sealing area is located on at least one of the second side and the fourth side.

[0012] According to some embodiments of the present application, the first sealing area is distributed around the accommodation cavity on the second side, the third side and the fourth side, and the second sealing area is distributed around the first sealing area on the second side, the third side and the fourth side.

[0013] According to some embodiments of the present application, along the first direction, one side of the first sealing area is flush with the second sealing area, and the other side of the first sealing area has a thickness difference with the second sealing area, and the ratio of the thickness of the first sealing area to the thickness of the second sealing area ranges from greater than 1 to less than 1.8.

[0014] According to some embodiments of the present application, the sealing edge area is provided with a notch portion at the junction area of the second side and the third side.

[0015] And / or, the sealing edge area is provided with a notch portion at the junction area of the third side and the fourth side.

[0016] According to some embodiments of the present application, the sealing edge area comprises a plurality of first sealing areas, and each first sealing area is arranged in a spaced manner.

[0017] According to some embodiments of the present application, along the direction of the first sealing area away from the accommodation cavity, the first sealing area comprises at least a first guide section with a gradually decreasing cross-sectional area.

[0018] According to some embodiments of the present application, the first sealing area further comprises a second guide section connected to one side of the first guide section close to the accommodation cavity, and the cross-sectional area of the second guide section is constant.

[0019] According to some embodiments of the present application, the width a of the second sealing area located on any side of the accommodation cavity is greater than or equal to 1 mm.

[0020] The battery according to the embodiments of the present application comprises a battery cell and the packaging structure according to any one of the above embodiments, and the battery cell is located in the accommodation cavity.

[0021] According to the battery of the embodiment of the present application, at least the following beneficial effects are achieved: the battery cell is packaged by using the packaging structure in the present application, the edge area can be broken in time when the battery is subjected to high temperature, explosion and fire accidents caused by excessive air pressure or high temperature in the accommodating cavity are effectively avoided, and the safety of the battery is ensured.

[0022] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the accompanying drawings and embodiments, wherein:

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a battery according to an embodiment of the present application;

[0025] Figure 2 FIG. 2 is a sectional view of A-A in FIG. 1; Figure 1

[0026] Figure 3 FIG. 3 is a partial enlarged schematic view of B in FIG. 2; Figure 2

[0027] Figure 4 FIG. 4 is a sectional view of an edge area in another embodiment of the present application;

[0028] Figure 5 FIG. 5 is a sectional view of an edge area in still another embodiment of the present application;

[0029] Figure 6 FIG. 6 is a structural schematic diagram of a battery according to another embodiment of the present application;

[0030] Figure 7 FIG. 7 is a structural schematic diagram of a first sealing area according to another embodiment of the present application;

[0031] Figure 8 FIG. 8 is a partial enlarged schematic view of C in FIG. 7; Figure 7

[0032] Reference signs: first packaging film 100, first groove 110, first edge 120;

[0033] second packaging film 200, second groove 210, second edge 220;

[0034] accommodating cavity 300, first side 310, second side 320, third side 330, fourth side 340;

[0035] edge area 400, first sealing area 410, first guide section 411, second guide section 412, second sealing area 420, notch part 430;

[0036] ​​​The electric cell 500. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below by way of example with reference to the accompanying drawings. Like or similar elements refer to like or similar elements throughout the present description. The embodiments described below are examples in which the present application is applied, and are for the purpose of explaining the present application only, and are not to be understood as limiting the present application.

[0038] In the description of the present application, it is to be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is two or more, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0040] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0041] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The embodiments of the present application are described below in conjunction with the accompanying drawings:

[0043] Reference Figures 1 to 3According to the packaging structure, the first packaging film 100 comprises a first groove 110 and a first sealing edge 120, the first sealing edge 120 is distributed around the first groove 110 on at least three sides, the second packaging film 200 is connected with the first packaging film 100, the second packaging film 200 comprises a second groove 210 and a second sealing edge 220, the second sealing edge 220 is distributed around the second groove 210 on at least three sides, the first groove 110 and the second groove 210 jointly form a containing cavity 300, the containing cavity 300 is used for containing an electric core 500, the first sealing edge 120 and the second sealing edge 220 are connected to define a sealing edge area 400, the sealing edge area 400 comprises a first sealing area 410 and a second sealing area 420, the first sealing area 410 is located on the side of the second sealing area 420 close to the containing cavity 300, along the first direction, the thickness of the first sealing area 410 is greater than the thickness of the second sealing area 420, so as to ensure that the sealing strength of the first sealing area 410 is weaker than the sealing strength of the second sealing area 420, facilitate the first sealing area 410 and the second sealing area 420 to be broken in turn when the battery is subjected to high temperature, and be beneficial to improving the safety of the battery.

[0044] It should be understood that, when the first sealing edge 120 and the second sealing edge 220 are heat-pressed and sealed to form the sealing area by the packaging mold, the first sealing area 410 corresponds to the groove position of the packaging mold, so that the pressing degree of the first sealing area 410 is less than the pressing degree of the second sealing area 420, and then the sealing strength of the first sealing area 410 is less than the strength of the second sealing area 420, so that, on the basis of ensuring the sealing of the containing cavity 300, the gas accumulated in the containing cavity 300 can first break through the first sealing area 410, and then break through the second sealing area 420 adjacent to the first sealing area 410, so as to realize the pressure relief of the battery, the gas discharged can take out the heat in the containing cavity 300, so as to avoid the heat from continuously accumulating in the containing cavity 300 to smoke and catch fire, and be beneficial to improving the safety of the battery.

[0045] It should be noted that, compared with the packaging structure in which the sealing strength of the sealing edge is uniform, the packaging structure in the application can realize the gradual breaking of the sealing area, and the process of breaking the sealing edge area 400 is more stable, and under the condition that the width of the sealing edge area 400 is uniform, the width of at least part of the sealing edge area 400 in the application is composed of the width of the first sealing area 410 and the width of the second sealing area 420, on the basis of ensuring the sealing of the containing cavity 300, a part of the sealing edge area 400 can be broken when the gas pressure in the containing cavity 300 is relatively small, and the gas pressure in the containing cavity 300 can be more easily released, which is beneficial to reducing the impact caused by breaking the packaging structure.

[0046] In the formula, the first sealing area 410 and the second sealing area 420 are connected to form the sealing edge area 400. Figure 3 Each small dashed box in the formula is only used to represent the partition division of the first sealing area 410 and the second sealing area 420.

[0047] Reference Figures 1 to 3 Specifically, the first sealing edge 120 and the second sealing edge 220 each include a heat sealing layer, for example, a polypropylene film on the side where the first sealing edge 120 and the second sealing edge 220 are in contact with each other. The first sealing edge 120 and the second sealing edge 220 are heated, and the heat sealing layer of the first sealing edge 120 and the second sealing edge 220 can be melted, so that the first sealing edge 120 and the second sealing edge 220 are connected to define a sealing edge area 400.

[0048] The first sealing edge 120 and the second sealing edge 220 are connected by heat sealing through a sealing mold to form a sealing edge area 400, and the sealing edge area 400 includes a first sealing area 410 and a second sealing area 420. The sealing mold is provided with a groove corresponding to the area of the first sealing area 410, and the groove is used to avoid forming the first sealing area 410. The first sealing area 410 is thicker than the second sealing area 420, so as to reduce the sealing strength of the first sealing area 410. The first sealing area 410 is located on the side of the second sealing area 420 close to the accommodation cavity 300. Since the gas accumulated in the accommodation cavity 300 at high temperature can first break through the first sealing area 410 with weak sealing, and then break through the second sealing area 420 adjacent to the first sealing area 410 and thinner, an exhaust port is formed, the pressure in the accommodation cavity 300 is released, and heat is discharged outward, effectively reducing the risk of battery smoking and fire, and improving the safety of the battery.

[0049] Reference Figures 1 to 4 In some other embodiments, the thickness of the first sealing area 410 to the second sealing area 420 gradually decreases, so that the cross section of the sealing edge area 400 is in the shape of a circular truncated cone. Therefore, along the direction of the sealing edge area 400 away from the accommodation cavity 300, the sealing strength of the sealing edge area 400 gradually increases, and the gas generated when the battery is heated can gradually break through the sealing edge area 400. On the one hand, when the battery is subjected to high temperature, the gas in the accommodation cavity 300 can gradually break through the sealing edge area 400, and the breaking is more stable. On the other hand, the closer the sealing edge area 400 is to the accommodation cavity 300, the weaker the sealing strength, which facilitates the timely breaking of the sealing edge area 400 when the battery is subjected to high temperature, and avoids causing explosion and fire.

[0050] It should be noted that the thickness of the first sealing area 410 is greater than the thickness of the second sealing area 420 should be understood as the thickness of the thinnest area of the first sealing area 410 is greater than the thickness of the thickest area of the second sealing area 420. In addition, Figure 4 The dashed line in the figure is used to represent the boundary line between the first sealing area 410 and the second sealing area 420.

[0051] Among them, Figure 4 Each smaller dashed box in the figure is only used to represent the partition division of the first sealing area 410 and the second sealing area 420.

[0052] Reference Figures 1 to 3In some embodiments, the packaging structure includes a first side 310, a second side 320, a third side 330 and a fourth side 340 connected in sequence, the first side 310 is arranged opposite to the third side 330 along a second direction, the second side 320 is arranged opposite to the fourth side 340 along a third direction, the first packaging film 100 is connected with the second packaging film 200 at the first side 310, the first sealing edge 120 and the second sealing edge 220 are connected at the second side 320, the third side 330 and the fourth side 340 to form a sealing edge area 400, that is, the first sealing edge 120 surrounds the first recess 110 at the second side 320, the third side 330 and the fourth side 340, and the second sealing edge 220 surrounds the second recess 210 at the second side 320, the third side 330 and the fourth side 340, so that the sealing edge area 400 surrounds the accommodation cavity 300 on three sides. The first direction, the second direction and the third direction are perpendicular to each other in pairs, the first direction can be the thickness direction of the packaging structure, the second direction can be the length direction of the packaging structure, and the third direction can be the width direction of the packaging structure. The third side 330 of the packaging structure is used for leading out the tab, and the first sealing area 410 is located on at least one of the second side 320 and the fourth side 340. Since the tab exists, the packaging is more complex, so the first sealing area 410 is arranged on at least one of the second side 320 and the fourth side 340 to avoid the tab leading-out side, which is more convenient for packaging of the packaging structure and reduces the packaging difficulty.

[0053] Reference Figure 5 and Figure 6 In some embodiments, the first sealing area 410 is distributed around the accommodation cavity 300 at the second side 320, the third side 330 and the fourth side 340, and the second sealing area 420 is distributed around the first sealing area 410 at the second side 320, the third side 330 and the fourth side 340, that is, the first sealing area 410 surrounds the accommodation cavity 300 on three sides, and the second sealing area 420 surrounds the first sealing area 410 on three sides. The battery generates gas when heated, which successively breaks through the first sealing area 410 and the second sealing area 420. After breaking through the first sealing area 410, the space for accommodating the gas is further expanded to relieve the expansion of the packaging structure, and then the second sealing area 420 is further broken through to achieve pressure relief and heat dissipation of the battery, avoid high temperature causing the battery to explode or catch fire, and improve the safety of the battery.

[0054] It should be noted that after the first sealing area 410 is broken, the space for accommodating the gas is increased, the gas pressure in the accommodation cavity 300 is relieved, and then the second sealing area 420 is broken, so that the breaking process is more stable, and the first sealing area 410 is arranged around the accommodation cavity 300 on three sides, which is convenient for breaking out a larger opening for pressure relief and heat dissipation, and is beneficial to further improve the safety of the battery.

[0055] Among them, Figure 5Each of the smaller dashed boxes is only used to represent the partitioning of the first sealing area 410 and the second sealing area 420.

[0056] Referring to Figures 1 to 8 In some other embodiments, the second side 320, the third side 330 and the fourth side 340 of the packaging structure are all provided with the second sealing area 420, and the second side 320 is provided with the first sealing area 410, the first sealing area 410 is located at the side of the second sealing area 420 close to the accommodating cavity 300, for the battery to break through the sealing edge area 400 at the second side 320 when suffering high temperature.

[0057] Referring to Figures 1 to 8 In some other embodiments, the second side 320, the third side 330 and the fourth side 340 of the packaging structure are all provided with the second sealing area 420, and the third side 330 is provided with the first sealing area 410, the first sealing area 410 is located at the side of the second sealing area 420 close to the accommodating cavity 300, for the battery to break through the sealing edge area 400 at the third side 330 when suffering high temperature.

[0058] Referring to Figures 1 to 8 In some other embodiments, the second side 320, the third side 330 and the fourth side 340 of the packaging structure are all provided with the second sealing area 420, and the fourth side 340 is provided with the first sealing area 410, the first sealing area 410 is located at the side of the second sealing area 420 close to the accommodating cavity 300, for the battery to break through the sealing edge area 400 at the fourth side 340 when suffering high temperature.

[0059] Referring to Figures 1 to 8 In some other embodiments, the second side 320, the third side 330 and the fourth side 340 of the packaging structure are all provided with the second sealing area 420, and the second side 320 and the third side 330 are both provided with the first sealing area 410, the first sealing area 410 of any one side is located at the side of the second sealing area 420 close to the accommodating cavity 300, for the battery to break through the sealing edge area 400 at the second side 320 and the third side 330 when suffering high temperature.

[0060] Referring to Figures 1 to 8 In some other embodiments, the second side 320, the third side 330 and the fourth side 340 of the packaging structure are all provided with the second sealing area 420, and the second side 320 and the fourth side 340 are both provided with the first sealing area 410, the first sealing area 410 of any one side is located at the side of the second sealing area 420 close to the accommodating cavity 300, for the battery to break through the sealing edge area 400 at the second side 320 and the fourth side 340 when suffering high temperature.

[0061] Referring to Figures 1 to 8In some embodiments, the first sealing area 410 is arranged on the first side 310 of the packaging structure, and the second sealing area 420 is arranged on the second side 320 of the packaging structure.

[0062] With reference to Figures 1 to 8 In some embodiments, the first sealing area 410 is arranged on the first side 310 of the packaging structure, and the second sealing area 420 is arranged on the second side 320 of the packaging structure.

[0063] With reference to Figures 1 to 8 In some embodiments, along the first direction, one side of the first sealing area 410 is flush with the second sealing area 420, and the other side of the first sealing area 410 has a thickness difference with the second sealing area 420, the ratio of the thickness of the first sealing area 410 to the thickness of the second sealing area 420 is greater than 1 and less than 1.8, that is, any value within the interval, for example, the thickness ratio of the first sealing area 410 to the second sealing area 420 can be any value of 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 and 1.7, and the first sealing area 410 is arranged on the side of the second sealing area 420 close to the accommodation cavity 300. When the folding operation is performed, the second sealing area 420 is folded, which can ensure that one side of the second sealing area 420 is always flush with one side of the first sealing area 410, thereby improving the safety of the battery and making the edge folding area 400 easier to fold and store.

[0064] With reference to Figure 5 And Figure 6 In some embodiments, the first sealing area 410 is arranged on the first side 310 of the packaging structure, and the second sealing area 420 is arranged on the second side 320 of the packaging structure.

[0065] It should be noted that the thicknesses of the first sealing area 410 and the second sealing area 420 can also be adjusted according to requirements. For example, the thickness of the first sealing area 410 is an even multiple of the thickness of the second sealing area 420, so that the first sealing area 410 and the second sealing area 420 have the same thickness after being bent, thereby facilitating the bending operation of the sealing structure. The thickness difference between the first sealing area 410 and the second sealing area 420 can be achieved by adjusting the groove depth of the packaging mold. For example, the packaging mold includes a first sealing head and a second sealing head. The first sealing head is used to abut the first sealing edge 120, and the second sealing head is used to abut the second sealing edge 220. One of the first sealing head and the second sealing head has a flat structure for heat sealing to form a side of the first sealing area 410 and the second sealing area 420 that is flush, and the other has a groove for heat sealing to form a side of the first sealing area 410 and the second sealing area 420 that has a thickness difference.

[0066] Reference Figures 1 to 7 In some embodiments, the sealing edge area 400 is provided with a notch portion 430 at the junction area of the second side 320 and the third side 330 of the packaging structure. The notch portion 430 is used to avoid interference between the sealing edge areas 400 located at the second side 320 and the third side 330 during bending, thereby facilitating the bending of the sealing edge areas 400 located at the second side 320 and the third side 330 to reduce the occupied space of the battery. In addition, the sealing edge area 400 is provided with a notch portion 430 at the junction area of the third side 330 and the fourth side 340. The notch portion 430 is used to avoid interference between the sealing edge areas 400 located at the third side 330 and the fourth side 340 during bending, thereby facilitating the bending of the sealing edge areas 400 located at the third side 330 and the fourth side 340 to reduce the occupied space of the battery.

[0067] Specifically, the packaging structure includes a first side 310, a second side 320, a third side 330, and a fourth side 340 connected in sequence and distributed around the accommodation cavity 300. The first sealing edge 120 is distributed on the second side 320, the third side 330, and the fourth side 340. The second sealing edge 220 is also distributed on the second side 320, the third side 330, and the fourth side 340. Then, the sealing edge area 400 formed by the connection of the first sealing edge 120 and the second sealing edge 220 has three sides around the accommodation cavity 300. The sealing edge area 400 located at the junction of the second side 320 and the third side 330, and the sealing edge area 400 located at the junction of the third side 330 and the fourth side 340 are both provided with a notch portion 430. The notch portion 430 is used to avoid interference between the second side 320 and the third side 330 during the edge bending operation, and to avoid interference between the third side 330 and the fourth side 340 during the edge bending operation.

[0068] Reference Figures 1 to 7In some embodiments, the edge sealing region 400 comprises a plurality of first sealing areas 410, each of which is located on the side of the second sealing area 420 close to the accommodating cavity 300, and each of which is spaced apart from each other. By arranging a plurality of first sealing areas 410, when the battery is subjected to high temperature, the edge sealing region 400 can be broken in the area where each first sealing area 410 is located, and a plurality of gas outlets are formed, and the pressure relief is more stable.

[0069] Specifically, on any side of the accommodating cavity 300, the first sealing area 410 and the second sealing area 420 are arranged along the width direction of the edge sealing region 400, so as to ensure that each first sealing area 410 is located on the side of the second sealing area 420 close to the accommodating cavity 300, and each first sealing area 410 located on any side of the accommodating cavity 300 is arranged along the length direction of the edge sealing region 400 on the side.

[0070] Reference Figures 1 to 7 In other embodiments, the packaging structure comprises a first side 310, a second side 320, a third side 330 and a fourth side 340 connected in sequence, the first packaging film 100 and the second packaging film 200 are connected at the first side 310, the first edge sealing 120 is located at the second side 320, the third side 330 and the fourth side 340, and the second edge sealing 220 is also located at the second side 320, the third side 330 and the fourth side 340. A plurality of first sealing areas 410 are distributed on the second side 320, the third side 330 and the fourth side 340, so that the gas expansion can break through the edge sealing region 400 from the three directions of the second side 320, the third side 330 and the fourth side 340, and the gas outlet has a plurality of, and the battery pressure relief is more stable.

[0071] Reference Figures 1 to 8 In some embodiments, along the direction of the first sealing area 410 away from the accommodating cavity 300, the first sealing area 410 comprises at least a first guide section 411 with a gradually decreasing cross-sectional area, which is used to guide the gas in the accommodating cavity 300 to generate a larger gas pressure in the local part of the first sealing area 410, so as to more easily break through the edge sealing region 400.

[0072] Wherein, along the direction of the first guide section 411 away from the accommodating cavity 300, the gradually decreasing cross-sectional area of the first guide section 411 should be understood as follows: taking the side of the first guide section 411 close to the accommodating cavity 300 as the bottom and the side of the first guide section 411 away from the accommodating cavity 300 as the top, the cross-sectional area gradually decreases from the bottom of the first guide section 411 to the top of the first guide section 411 by a plurality of planes perpendicular to the connecting line of the bottom and the top of the first guide section 411.

[0073] In addition, along the plane perpendicular to the first direction, the first guide section 411 can be triangular, conical or other structures.

[0074] Reference Figures 1 to 8 In some embodiments, the first sealing area 410 further comprises a second guiding section 412 connected to the first guiding section 411 at a side close to the accommodating cavity 300, and the cross-sectional area of the second guiding section 412 is constant, the second guiding section 412 is used to provide a weak sealing area for the packaging structure and ensure the sealing of the packaging structure, when the air pressure breaks through the second guiding section 412 and the first guiding section 411 in turn, the first guiding section 411 can also guide the gas to further break through the second sealing area 420, so that the gas is easier to break through the second sealing area 420, and the pressure relief of the battery is realized. Therefore, the arrangement of the first guiding section 411 and the second guiding section 412 can not only ensure the sealing of the sealing edge area 400, but also make it easier to break through the sealing edge area 400 when the air pressure is larger.

[0075] It should be understood that the cross-sectional area of the second guiding section 412 is understood as the cross-sectional area generated by cutting the second guiding section 412 by a plane perpendicular to the direction of the first sealing area 410 away from the accommodating cavity 300.

[0076] It should be understood that, in the first direction, the thickness of the first guiding section 411 and the second guiding section 412 is greater than that of the second sealing area 420, that is, the sealing strength of the first guiding section 411 and the second guiding section 412 is less than that of the second sealing area 420.

[0077] Reference Figures 1 to 5 In some embodiments, the width of the second sealing area 420 on any side of the accommodating cavity 300 is a, and a≥1mm, that is, on any side of the accommodating cavity 300, the width of the second sealing area 420 on any side of the accommodating cavity 300 in the width direction of the sealing edge area 400 is at least 1mm, which is used to ensure the sealing of any side of the accommodating cavity 300, avoid the leakage of electrolyte in the accommodating cavity 300, and block the air and moisture in the environment from entering the accommodating cavity 300, so that the performance of the battery is more stable.

[0078] It should be noted that the sealing edge area 400 is distributed around the accommodating cavity 300 on at least three sides, and the width direction of the sealing edge area 400 on different sides of the accommodating cavity 300 can be different, for example, the width direction of the sealing edge area 400 on two adjacent sides of the accommodating cavity 300 can be perpendicular to each other.

[0079] Reference Figures 1 to 5In some embodiments, the packaging structure comprises a first side 310, a second side 320, a third side 330 and a fourth side 340 connected in sequence, the second side 320, the third side 330 and the fourth side 340 each have a sealing edge area 400, and the sealing edge area 400 of the second side 320, the third side 330 and the fourth side 340 each comprises a second sealing area 420, the sealing edge area 400 of the second side 320 and the fourth side 340 has a width direction being the third direction, and the sealing edge area 400 of the third side 330 has a width direction being the second direction.

[0080] In the packaging structure, the width of the sealing edge area 400 can be any one of 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, and accordingly, the maximum value of the width a of the second sealing area 420 in the width direction of the sealing edge area 400 can be the width of the sealing edge area 400, i.e., the value range of a can be any one of 1mm to 10mm, for example, the value of a can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm. By adjusting the width a of the second sealing area 420, it is beneficial to better balance the sealing performance and safety of the battery, avoid liquid leakage due to the second sealing area 420 being too narrow, and also avoid the second sealing area 420 being too wide to break through the sealing edge area 400, on the basis of ensuring the sealing performance of the sealing edge area 400, avoid occupying a large space, and it is beneficial to improve the energy density of the battery.

[0081] It should be noted that the sealing edge area 400 includes an area provided with both the first sealing area 410 and the second sealing area 420, and also includes an area provided with only the second sealing area 420, in the area provided with both the first sealing area 410 and the second sealing area 420, the sum of the widths of the first sealing area 410 and the second sealing area 420 is the width of the sealing edge area 400, and in the area provided with only the second sealing area 420, the width of the second sealing area 420 is the width of the sealing edge area 400.

[0082] Reference Figures 1 to 8 The packaging structure is further described below in combination with the production process of the packaging structure in the present application:

[0083] Firstly, the packaging mold for producing the packaging structure in the application includes a first sealing head and a second sealing head, and the side of the first sealing head and the second sealing head facing each other is provided with a groove. When the first sealing head and the second sealing head jointly heat seal the first sealing edge 120 and the second sealing edge 220, the position of the groove corresponds to the side of the first sealing edge 120 and the second sealing edge 220 close to the accommodating cavity 300. By avoiding the groove, the sealing edge area 400 is not heat sealed and compressed or is less heat sealed and compressed at the position corresponding to the groove, so that a relatively thin second sealing area 420 is formed at the position without the groove, and a relatively thick first sealing area 410 is formed at the position with the groove. The sealing strength of the second sealing area 420 is greater than that of the first sealing area 410.

[0084] In addition, in order to make the sealing strength of the first sealing area 410 and the second sealing area 420 form a more obvious difference during the sealing operation, the thickness of the polypropylene layer of the first sealing edge 120 and the second sealing edge 220 can be adjusted so that the position corresponding to the second sealing area 420 can be heat sealed and compressed to a greater extent, thereby increasing the thickness difference between the first sealing area 410 and the second sealing area 420, and the sealing strength of the two is further increased.

[0085] Reference Figures 1 to 8 According to the battery of the embodiment of the application, the battery includes a battery cell 500 and the packaging structure in any of the above embodiments. The packaging structure defines an accommodating cavity 300, and the battery cell 500 is located in the accommodating cavity 300. Through the packaging of the battery cell 500 by the packaging structure, the sealing edge area 400 can be broken in time when the battery encounters a high-temperature environment, so as to avoid excessive gas pressure and high temperature in the accommodation, and the safety of the battery is beneficially ensured.

[0086] Specifically, the first packaging film 100 and the second packaging film 200 are always connected at the first side 310. The battery cell 500 is placed in the first groove 110 or the second groove 210. The first packaging film 100 and the second packaging film 200 are reversely buckled. The first groove 110 and the second groove 210 define the accommodating cavity 300. Then, the first sealing edge 120 and the second sealing edge 220 are heat sealed to realize the sealing of the accommodating cavity 300.

[0087] It should be noted that the battery of the application can also improve the safety of the battery in the battery oven test link. During the battery oven test, as the temperature rises, the battery will produce a more serious inflation. The gas in the accommodating cavity 300 can sequentially break through the first sealing area 410 and the second sealing area 420, so as to avoid explosion and fire caused by excessive gas pressure and high temperature in the accommodating cavity 300, and the safety of the battery of the application is beneficially improved.

[0088] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A packaging structure, characterized in that, include: A first encapsulation film includes a first groove and a first sealing edge, wherein the first sealing edge is distributed around the first groove on at least three sides; A second encapsulation film is connected to the first encapsulation film. The second encapsulation film includes a second groove and a second sealing edge, with the second sealing edge distributed around the second groove on at least three sides. The first groove and the second groove together form a receiving cavity, and the first sealing edge and the second sealing edge are connected to define a sealing edge area. The sealing edge area includes a first sealing area and a second sealing area. The first sealing area is located on the side of the second sealing area close to the receiving cavity and along a first direction. The thickness of the first sealing area is greater than the thickness of the second sealing area.

2. The packaging structure according to claim 1, characterized in that, The encapsulation structure includes a first side, a second side, a third side, and a fourth side connected in sequence. Along a second direction, the first side and the third side are arranged opposite to each other. Along a third direction, the second side and the fourth side are arranged opposite to each other. The first encapsulation film and the second encapsulation film are connected on the first side. The first sealing edge and the second sealing edge are connected on the second side, the third side, and the fourth side to form the sealing edge area. The first direction, the second direction, and the third direction are perpendicular to each other. The third side is used to bring out the electrode tab, and the first sealing area is located on at least one of the second side and the fourth side.

3. The packaging structure according to claim 2, characterized in that, The first sealing area is distributed around the accommodating cavity on the second side, the third side, and the fourth side, and the second sealing area is distributed around the first sealing area on the second side, the third side, and the fourth side.

4. The packaging structure according to claim 3, characterized in that, Along the first direction, one side of the first sealing area is flush with the second sealing area, the other side of the first sealing area has a thickness difference with the second sealing area, and the ratio of the thickness of the first sealing area to the thickness of the second sealing area is greater than 1 and less than 1.

8.

5. The packaging structure according to claim 2, characterized in that, In the boundary area between the second side and the third side, the sealing area is provided with a notch; And / or, in the boundary area between the third side and the fourth side, the sealing area is provided with the notch.

6. The packaging structure according to claim 1, characterized in that, The sealing area includes multiple first sealing zones, which are spaced apart.

7. The packaging structure according to claim 1, characterized in that, Along the direction away from the receiving cavity from the first sealing area, the first sealing area includes at least a first guide segment with a gradually decreasing cross-sectional area.

8. The packaging structure according to claim 7, characterized in that, The first sealing area also includes a second guide segment, which is connected to the side of the first guide segment near the receiving cavity, and the cross-sectional area of ​​the second guide segment remains unchanged.

9. The packaging structure according to any one of claims 1 to 8, characterized in that, The width a of the second sealing area located on either side of the accommodating cavity is ≥1mm.

10. A battery, characterized in that, include: Battery cell; The packaging structure according to any one of claims 1 to 9, wherein the battery cell is located in the accommodating cavity.

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