Battery cell packaging structure and battery

Abstract

The utility model discloses a battery cell packaging structure and a battery. The battery cell packaging structure comprises a packaging material and a top sealing area. The packaging material is provided with a first tab sealing part and a second tab sealing part. The first tab sealing part is used for accommodating a first tab, and the second tab sealing part is used for accommodating a second tab. A sealing area in a groove shape or a continuous corrugated shape is formed in the top sealing area, so that the packaging material fully extends in the top sealing process. According to the invention, the sealing area in the groove shape or the continuous corrugated shape is formed in the top sealing area, so that the packaging material at the corner position and the tab groove can fully extend in the packaging process of the battery cell, and the wrinkling phenomenon is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a battery cell packaging structure and a battery. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density and long cycle life. Soft-packaged lithium-ion batteries are a type of consumer battery. The electrolyte of soft-packaged lithium-ion batteries contains a complex organic mixed solvent. If leakage occurs, it will cause safety hazards such as fire and explosion. Therefore, the packaging safety and reliability of the aluminum-plastic film of soft-packaged lithium-ion batteries are extremely important. Therefore, for soft-packaged lithium batteries, the battery cells need to be sealed during their manufacturing process. Among them, the packaging between the pole ear and the aluminum-plastic film (referred to as top sealing) is an important part of the manufacturing process of aluminum-plastic film soft-packaged lithium-ion batteries.

[0003] At present, the surface shape of the top seal is mainly flat. However, the use of a flat shape has the following problems: First, when the aluminum-plastic film is punched, the aluminum-plastic film will wrinkle and deform at the corners. When the seal shape is a flat shape, it is easy to cause a poor seal. When the tab seal is a flat shape, the tab glue and the aluminum-plastic film will be uneven, which is also easy to cause wrinkles. It is not conducive to the top seal safety packaging of the battery. Utility Model Content

[0004] The main purpose of the present application is to provide a battery cell packaging structure and a battery to solve the problem of packaging wrinkling in the top sealing process of lithium-ion batteries in the prior art.

[0005] According to one aspect of the present application, a battery cell packaging structure is provided, comprising:

[0006] A packaging package material, wherein the packaging package material has a first pole ear sealing portion and a second pole ear sealing portion, wherein the first pole ear sealing portion is used to accommodate the first pole ear, and the second pole ear sealing portion is used to accommodate the second pole ear; and

[0007] The top seal area is arranged at the top of the packaging material, and the top seal area is formed with a sealing area in a groove shape or a continuous corrugated shape, so that the packaging material can be fully extended during the top seal process.

[0008] In one embodiment, the sealing area is in the shape of a groove, and the top seal area includes a first flat seal area, a second flat seal area, and a groove seal area.

[0009] The first flat seal area is arranged close to the first pole ear seal portion, the second flat seal area is arranged close to the second pole ear seal portion, and the groove seal area is arranged between the first flat seal area and the second flat seal area;

[0010] The groove sealing area includes a straight edge area and a first bevel edge area and a second bevel edge area located on both sides of the straight edge area. The straight edge area, the first bevel edge area and the second bevel edge area together form a groove shape. The first bevel edge area is arranged at the connection between the first flat mouth sealing area and the straight edge area and is inclined. The second bevel edge area is arranged at the connection between the second flat mouth sealing area and the straight edge area and is inclined.

[0011] In one embodiment, the sealing widths of the first flat sealing area, the second flat sealing area, and the groove sealing area satisfy the following relationship:

[0012] 2mm≤W1=W5≤W2=W4≤W3≤6mm

[0013] Among them, W1 is the sealing width of the first flat sealing area, W2 is the sealing width of the first bevel area, W3 is the sealing width of the straight edge area, W4 is the sealing width of the second bevel area, and W5 is the sealing width of the second flat sealing area.

[0014] In one embodiment, a first rounded corner is formed between the first flat sealing area and the first beveled edge area, a second rounded corner is formed between the first beveled edge area and the straight edge area, a third rounded corner is formed between the second beveled edge area and the straight edge area, and a fourth rounded corner is formed between the second flat sealing area and the second beveled edge area. The angle range of the first rounded corner, the second rounded corner, the third rounded corner and the fourth rounded corner is between 20° and 90°.

[0015] In one embodiment, a distance W7 between the top of the straight edge area and the top of the packaging material satisfies the following relationship: 3 mm ≤ W7 ≤ 9 mm.

[0016] In one embodiment, the distances between the two ends of the groove sealing area and the first electrode tab and the second electrode tab satisfy the following relationship:

[0017] 4mm≤a≤15mm, 4mm≤b≤15mm

[0018] Among them, a is the distance between one end of the groove sealing area and the first pole lug, and b is the distance between the other end of the groove sealing area and the second pole lug.

[0019] In one embodiment, the sealing area is in a continuous corrugated shape, the top seal area includes a third flat seal area, a fourth flat seal area, and a corrugated seal area, and the corrugated seal area is arranged between the third flat seal area and the fourth flat seal area;

[0020] The corrugated sealing area includes a plurality of circular arcs, which are connected end to end and connected between the third flat sealing area and the fourth flat sealing area.

[0021] In one embodiment, the sealing widths of the third flat sealing area, the fourth flat sealing area, and the corrugated sealing area are the same.

[0022] In one embodiment, the distance d between the end of the corrugated seal area close to the second pole ear and the pole ear glue of the second pole ear satisfies the following relationship: 1mm≤d≤10mm; the height difference h between the highest point or the lowest point of each arc and the plane where its endpoint is located satisfies the following relationship: 0.02mm≤d≤0.06mm.

[0023] According to another aspect of the present application, a battery is provided, comprising: a battery body and a battery cell packaging structure as described in the above embodiments, wherein the packaging material is used to seal the battery body, and the top seal area is located at the top of the battery body.

[0024] In the present application, by forming a sealing area with a groove shape or a continuous corrugated shape in the top seal area, during the cell packaging process, the packaging materials at the corners and the tab grooves can be fully extended, thereby reducing the occurrence of wrinkling. At the same time, compared with the flat seal design, the groove seal shape or the continuous corrugated seal shape has no obvious protrusions, ensuring that the tab glue is heated evenly and a temperature gradient is not easily formed. The above seal shape design improves the packaging wrinkling phenomenon that exists in the top seal process through physical contact, and improves the melting consistency of the tab glue and the packaging material during packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 This is a schematic structural diagram of a cell packaging structure disclosed in one of the embodiments of the present application;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the top seal area in FIG.

[0028] Figure 3 for Figure 2 An enlarged schematic diagram of region A in FIG.

[0029] Figure 4 A schematic structural diagram of a cell packaging structure disclosed in another embodiment of the present application;

[0030] Figure 5 for Figure 4 Schematic diagram of the structure of the packaging material after being packaged;

[0031] Figure 6 for Figure 4 A schematic structural diagram of the cell packaging structure in another direction;

[0032] Figure 7 for Figure 6 An enlarged schematic diagram of area B in FIG.

[0033] The above drawings include the following reference numerals:

[0034] 100, 300, battery cell packaging structure; 200, 400, packaging material; 10, battery body; 30, side sealing packaging structure; 210, 410, air pocket area; 110, 310, first pole ear sealing part; 120, 320, second pole ear sealing part; 111, 311, first pole ear; 121, 321, second pole ear; 112, 312, first pole ear protective glue; 122, 322, second pole ear protective glue; 131, first flat seal area; 132, second flat seal area; 133, 143, concave Groove sealing area; 1331, straight edge area; 1332, first beveled edge area; 1333, second beveled edge area; 331, third flat seal area; 332, fourth flat seal area; 333, 343, corrugated seal area, 3331, arc; 401, first packaging material; 402, second packaging material; 403, first head; 404, second head; 4031, corrugations between the tabs of the first head; 4032, corrugations on the airbag edge of the first head; 4041, corrugations between the tabs of the second head; 4042, corrugations on the airbag edge of the second head. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0038] See also Figures 1 to 3 The present application provides a battery cell packaging structure 100 for packaging a battery cell. The battery cell packaging structure 100 includes a packaging material 200. In this embodiment, the battery cell includes a battery body 10, a side sealing packaging structure 30 and an air pocket area 210.

[0039] The packaging package 200 is provided with a first pole tab sealing portion 110 and a second pole tab sealing portion 120. The first pole tab sealing portion 110 is used to accommodate a first pole tab 111. The second pole tab sealing portion 120 is used to accommodate a second pole tab 121.

[0040] The packaging material 200 is provided with a top seal area 130. The top seal area 130 is formed with a sealing area in the shape of a groove, so that the packaging material 200 can be fully extended during the top seal process.

[0041] In this embodiment, the packaging material 200 is used to seal the battery body 10. The top seal area 130 is located at the top of the battery body 10.

[0042] In the present application, by forming a sealing area with a groove shape in the top seal area 130, during the battery cell packaging process, the packaging material 200 at the corners and the tab grooves can be fully extended, thereby reducing the occurrence of wrinkling. At the same time, compared with the design of the flat seal without obvious protrusions, the groove seal shape can ensure that the tab glue is heated evenly and is not easy to form a temperature gradient. The design of the above seal shape improves the packaging wrinkling phenomenon that exists in the top seal process through the method of physical contact, and improves the melting consistency of the tab glue and the packaging material during packaging. In this embodiment, the packaging material 200 is made of aluminum-plastic film.

[0043] In fact, the aluminum-plastic film will be stretched during the stretching process, and the stretched aluminum-plastic film will be arched into a wave shape due to the mutual internal stress. During packaging, if a straight packaging head is used, the flat straight sealing head cannot stretch the aluminum-plastic film well when pressed down, so that the aluminum-plastic film is squeezed against each other to form wrinkles. In this embodiment, a groove-shaped sealing area is provided in the top sealing area 130 of the battery cell packaging structure 100. The groove-shaped sealing area can allow the aluminum-plastic film to have sufficient space to stretch, thereby reducing the generation of wrinkles.

[0044] Specifically, the groove-shaped sealing area can also allow the packaging material 200 at the corner to be fully extended. The corner refers to the four corners of the edge of the pit formed by the punching. Generally speaking, the longer the head, the more difficult it is to extend the tensile deformation of the aluminum-plastic film. In this embodiment, the battery cell packaging structure 100 with a groove-shaped sealing area is equivalent to forming a fracture in the long straight head, which is conducive to the release of the extension of the aluminum-plastic film at the fracture.

[0045] In this embodiment, the top seal area 130 includes a first flat seal area 131 , a second flat seal area 132 and a groove seal area 133 .

[0046] The first flat seal area 131 is disposed near the first pole lug seal portion 110. The second flat seal area 132 is disposed near the second pole lug seal portion 120. The groove seal area 133 is disposed between the first flat seal area 131 and the second flat seal area 132.

[0047] The groove sealing area 133 includes a straight edge area 1331 and a first beveled edge area 1332 and a second beveled edge area 1333 located on both sides of the straight edge area 1331. The straight edge area 1331, the first beveled edge area 1332 and the second beveled edge area 1333 together form a groove shape. The first beveled edge area 1332 is arranged at the connection between the first flat seal area 131 and the straight edge area 1331 and is arranged obliquely. The second beveled edge area 1333 is arranged at the connection between the second flat seal area 132 and the straight edge area 1331 and is arranged obliquely.

[0048] In this embodiment, since the groove sealing area 133 includes a straight edge area 1331 and a first oblique edge area 1332 and a second oblique edge area 1333 located on both sides of the straight edge area 1331, and the straight edge area 1331, the first oblique edge area 1332 and the second oblique edge area 1333 together form a groove shape, the groove-shaped groove sealing area 133 can effectively extend the aluminum-plastic film during the packaging process, thereby reducing the generation of wrinkles. In addition, since the first oblique edge area 1332 is inclined to the first flat-mouth sealing area 131, and the second oblique edge area 1333 is inclined to the second flat-mouth sealing area 132, these two inclined surfaces can effectively extrude and extend the aluminum-plastic film, thereby reducing the generation of wrinkles in the aluminum-plastic film. In this embodiment, a first pole ear protection glue 112 is arranged around the first pole ear 111. A second pole ear protection glue 122 is arranged around the second pole ear 121. At this time, the groove sealing area 133 is set to a shape including the straight edge area 1331, the first bevel edge area 1332 and the second bevel edge area 1333, which can also ensure that the battery cell packaging structure 100 and the first pole ear protection glue 112 and the second pole ear protection glue 122 will not interfere with each other.

[0049] In one embodiment, the sealing widths of the first flat seal area 131, the second flat seal area 132, and the groove seal area 133 satisfy the following relationship:

[0050] 2mm≤W1=W5≤W2=W4≤W3≤6mm

[0051] Among them, W1 is the sealing width of the first flat sealing area, W2 is the sealing width of the first bevel area, W3 is the sealing width of the straight edge area, W4 is the sealing width of the second bevel area, and W5 is the sealing width of the second flat sealing area.

[0052] In this embodiment, the purpose of setting the seal widths of the first flat seal area 131, the second flat seal area 132, and the groove seal area 133 to meet the above relationship is to meet the requirements of seal reliability. When the seal width is too small, the time for water vapor to penetrate becomes shorter, and the reliability of the battery cell is reduced. When the seal width is too wide, it will affect the volume and mass energy density of the battery cell. As shown in the above dimensional relationship, the seal width W2 of the first oblique edge area of ​​the groove area, the seal width W4 of the second oblique edge area, and the seal width W3 of the straight edge area must be greater than or equal to the seal width W1 of the first flat seal area 131 and the seal width W2 of the second flat seal area 132. This setting method is to ensure the sealing effect of the groove area. As needed, the seal widths of the first flat seal area 131, the second flat seal area 132, and the groove seal area 133 can also meet the following dimensional relationship: 2mm≤W1=W5=W2=W4=W3≤6mm.

[0053] As needed, several joints of the groove sealing area 133 can be smoothed so that the packaging material 200 can be better extended in these parts. In this embodiment, a first fillet R1 is formed between the first flat seal area 131 and the first bevel area 1332. A second fillet R2 is formed between the first bevel area 1332 and the straight edge area 1331. A third fillet R3 is formed between the second bevel area 1333 and the straight edge area 1331. A fourth fillet R4 is formed between the second flat seal area 132 and the second bevel area 1333. The angle range of the first fillet R1, the second fillet R2, the third fillet R3 and the fourth fillet R4 is between 20° and 90°.

[0054] In this embodiment, the distance W7 between the top of the straight edge area 1331 and the top of the packaging material 200 satisfies the following relationship: 3mm≤W7≤9mm. On the one hand, when the distance W7 between the top of the straight edge area 1331 and the top of the packaging material 200 is too small, the expansion space of the packaging material 200 will be insufficient, so that the improvement effect of the groove sealing area 133 on the wrinkling problem is not good. On the other hand, when the distance W7 between the top of the straight edge area 1331 and the top of the packaging material 200 is too large, the groove sealing area 133 will interfere with the battery body, resulting in poor sealing.

[0055] In one embodiment, the distances between the two ends of the groove sealing area 133 and the first pole tab 111 and the second pole tab 121 satisfy the following relationship:

[0056] 4mm≤a≤15mm, 4mm≤b≤15mm

[0057] Wherein, a is the distance between one end of the groove sealing area 133 and the first pole ear 111 , and b is the distance between the other end of the groove sealing area 133 and the second pole ear 121 .

[0058] In the above embodiments, if the distance a or b between the two ends of the groove sealing area 133 and the first pole ear 111 or the second pole ear 121 is too small, it is easy to cause interference between the groove sealing area 133 and the pole ear, resulting in poor packaging. On the other hand, if the distance a or b between the two ends of the groove sealing area 133 and the first pole ear 111 or the second pole ear 121 is too small, it is also easy to cause interference between the groove sealing area 133 and the first pole ear protective glue 112 or the second pole ear protective glue 122, resulting in poor packaging. If the distance a or b between the two ends of the groove sealing area 133 and the first pole ear 111 or the second pole ear 121 is too large, it indicates that the length of the groove of the groove sealing area 133 is not enough, and there is insufficient space for the punching extension, so the improvement effect on the wrinkling problem is not good.

[0059] As needed, the battery cell packaging structure 100 also includes an air pocket area 210. The air pocket area 210 is also provided with the groove sealing area 143. The groove sealing area 143 and the groove sealing area 133 are respectively arranged on both sides of the second pole ear 121. In this embodiment, the distance c between one end of the groove sealing area 143 and the second pole ear 122 has the following size relationship: 4mm≤c≤25mm. Similarly, if the distance c between one end of the groove sealing area 143 and the second pole ear 122 is too small, it is easy to cause interference between the groove sealing area 143 and the second pole ear 121, or interference between the groove sealing area 143 and the second pole ear protective glue 122. If the distance c between one end of the groove sealing area 143 and the second pole ear 122 is too large, the extension of the punching cannot be effectively unfolded at the edge of the air pocket, resulting in the inability to improve the wrinkling problem.

[0060] In some examples, the length L1 of the straight edge area 1331 and the distance L2 between the first pole ear 111 and the second pole ear 121 have the following relationship: 0.2≤L1 / L2≤0.8. When L1 / L2 is too small, the extension effect is poor and the improvement effect on the wrinkling problem is poor. When L1 / L2 is too large, there is a risk of leakage because the groove sealing area 133 is too close to the first pole ear 111 or the second pole ear 121 to cause interference.

[0061] As required, a plurality of the groove sealing areas 133 may be provided between the first pole ear sealing portion 110 and the second pole ear sealing portion 120, with the number of 1-2 provided. As required, a plurality of the groove sealing areas 143 may also be provided on the side of the second pole ear sealing portion 120 away from the first pole ear sealing portion 110, with the number of 1-3 provided.

[0062] See also Figures 4 to 7Another embodiment of the present application provides a battery cell packaging structure 300 for packaging a battery cell. The battery cell packaging structure 300 includes a packaging material 400. In this embodiment, the battery cell includes a battery body 10, a side sealing packaging structure 30 and an air pocket area 410.

[0063] The packaging package 400 is provided with a first electrode tab sealing portion 310 and a second electrode tab sealing portion 320 . The first electrode tab sealing portion 310 is used to accommodate a first electrode tab 311 . The second electrode tab sealing portion 220 is used to accommodate a second electrode tab 312 .

[0064] The packaging material 400 is provided with a top seal area 330. The top seal area 330 is formed with a sealing area in a continuous corrugated shape, so that the packaging material 400 can be fully extended during the top seal process.

[0065] In the present application, by forming a sealing area with a continuous corrugated shape in the top seal area 230, during the battery cell packaging process, the packaging material 400 at the corners and the tab grooves can be effectively extended, thereby reducing the occurrence of wrinkling. At the same time, compared with the design of the flat seal without obvious protrusions, the continuous corrugated seal shape ensures that the tab glue is heated evenly and is not easy to form a temperature gradient. The design of the above seal shape improves the packaging wrinkling phenomenon that exists in the top seal process through the method of physical contact, and improves the melting consistency of the tab glue and the packaging material 400 during packaging. In fact, the corrugated seal area is equivalent to forming a concave and convex surface on the plane, matching the extension of the packaging material 400, and releasing the extension of the packaging material 400 at each corrugation. In this embodiment, the packaging material 400 is made of aluminum-plastic film.

[0066] In one embodiment, the sealing area is in a continuous corrugated shape. The top seal area 330 includes a third flat seal area 331, a fourth flat seal area 332, and a corrugated seal area 333. The corrugated seal area 333 is disposed between the third flat seal area 331 and the fourth flat seal area 332.

[0067] The corrugated seal area 333 includes a plurality of arcs 3331. The plurality of arcs 3331 are connected end to end and connected between the third flat seal area 331 and the fourth flat seal area 332. The distance between the two end points of each arc is between 2 mm and 10 mm. Preferably, the distance between the two end points of each arc is between 3 mm and 8 mm. Figure 5 As shown, the corrugated sealing area 333 includes 7 arcs 3331, and the distance between the two end points of each arc ranges from 2 mm to 10 mm.

[0068] In this embodiment, by configuring the corrugated sealing area 333 to be a plurality of arc segments connected end to end, the end-to-end connected corrugated sealing area 333 can effectively stretch the packaging material 400 during the packaging process, thereby reducing the generation of wrinkles.

[0069] In one embodiment, the third flat seal area 331, the fourth flat seal area 332, and the corrugated seal area 333 have the same seal width. The curvature of each arc 3331 is between 30° and 180°. Preferably, the curvature of each arc 3331 is between 90° and 160°.

[0070] As required, a first pole ear protection glue 312 is arranged around the first pole ear 311. A second pole ear protection glue 322 is arranged around the second pole ear 321. In this embodiment, the distance d between the end of the corrugated seal area and the first pole ear protection glue 312 or the second pole ear protection glue 322 satisfies the following relationship: 1mm≤d≤10mm. The height difference h between the highest point or the lowest point of each arc and the plane where its endpoint is located satisfies the following relationship: 0.02mm≤d≤0.06mm.

[0071] As needed, similar to the groove sealing area, the distances between the two ends of the corrugated sealing area 333 and the first pole ear 311 or the second pole ear 321 have the following dimensional relationships: 4mm≤a1≤15mm, 4mm≤b1≤15mm. Wherein, a1 is the distance between one end of the corrugated sealing area 333 and the first pole ear 311; b1 is the distance between the other end of the corrugated sealing area 333 and the second pole ear 321. When the distance a1 or b1 is too small, interference may occur between the corrugated sealing area 333 and the first pole ear 311 or the second pole ear 321. In addition, since the peaks and troughs formed by the corrugations have certain deformations, the deformation is too close to the pole ears, resulting in poor packaging and leakage.

[0072] As required, the cell packaging structure 300 further includes an air pocket area 410. The air pocket area 410 is also provided with the corrugated sealing area 343. The corrugated sealing area 333 and the corrugated sealing area 343 are respectively provided on both sides of the second pole tab 321.

[0073] The distance c1 between one end of the corrugated seal area 343 and the second pole ear 321 has the following size relationship: 4mm≤c1≤25mm. Similarly, if the distance c1 between one end of the corrugated seal area 343 and the second pole ear 321 is too small, it is easy to cause interference between the corrugated seal area 343 and the second pole ear 321, or interference between the corrugated seal area 343 and the second pole ear protective glue 3222. If the distance c1 between one end of the corrugated seal area 343 and the second pole ear 321 is too large, the extension of the punching cannot be effectively unfolded at the edge of the airbag, resulting in the inability to improve the wrinkling problem.

[0074] In this embodiment, the sealing length of a single corrugated sealing area 333 is L3, which has the following relationship: 2mm≤L3≤10mm, preferably 3mm≤L3≤8mm. In this embodiment, the sealing length L3 of a single corrugated sealing area 333 is the distance between the two end points of each arc 3331. When a single corrugation is too small, the deformation will be too severe, causing the aluminum-plastic film to stretch violently and tear. When a single corrugation is too large, it will not have the stretching effect. In some examples, the number of corrugated sealing areas 333 set between the first pole ear 311 and the second pole ear 321 is 2-4. The number of corrugated sealing areas 343 set on the other side of the second pole ear 321 is 3-5.

[0075] Figure 7 It is an enlarged view of the details of the corrugated sealing area 343. As shown in the figure, the distance d between the end of the corrugated sealing area 343 close to the second pole ear 321 and the pole ear glue of the second pole ear 321, that is, the second pole ear protective glue 322, is ≥2mm. The corrugation height h of the corrugated sealing area 343 has the following relationship: 0.02mm≤h≤0.06mm. If the corrugation height is too small, the flattening effect is not good. If the corrugation height is too large, the extension is too drastic, which makes it easy to tear the packaging material 400. The curvature R5 of the corrugated trough has the following relationship: 30°≤R5≤180°, preferably 90°≤R5≤160°. If R5 is too small, the packaging material 400 will be torn. If it is too large, the extension effect is not good and the wrinkling improvement effect is not good.

[0076] Figure 4It is a schematic diagram of packaging a battery cell. 401 represents the first packaging material, 402 represents the second packaging material, 403 represents the first head, 404 represents the second head, 4031 is the corrugation between the pole ears of the first head, 4032 is the corrugation on the edge of the air bag of the first head, 4041 is the corrugation between the pole ears of the second head, and 4042 is the corrugation on the edge of the air bag of the second head. As can be seen from the figure, when the first packaging material 401 and the second packaging material 402 are top-sealed, the first pole ear 311 and the second pole ear 321 are sandwiched in the middle. The first head 403 and the second head 404 move up and down to close, so that the first packaging material 401, the second packaging material 402, the first pole ear 311 and the second pole ear 321 are melted and heat-sealed together. After the heads are closed, the corrugated shape of the first head 403 and the second head 404 causes the packaging material 400 to also form a corrugated seal shape after heat sealing, as shown in FIG. Figure 5 shown.

[0077] Another embodiment of the present application further provides a battery, comprising: a battery body 10 and a battery cell packaging structure 100 as described in the above embodiment, the packaging material 200 is used to seal the battery body 10, and the top seal area 130 is located at the top of the battery body 10.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0079] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0080] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell packaging structure, characterized in that: include: A packaging material, wherein the packaging material has a first pole lug sealing portion and a second pole lug sealing portion, wherein the first pole lug sealing portion is used to accommodate the first pole lug, and the second pole lug sealing portion is used to accommodate the second pole lug; as well as The top seal area is arranged at the top of the packaging material, and the top seal area is formed with a sealing area in a groove shape or a continuous corrugated shape, so that the packaging material can be fully extended during the top seal process.

2. The battery cell packaging structure according to claim 1, characterized in that: The sealing area is in the shape of a groove, and the top seal area includes a first flat seal area, a second flat seal area, and a groove seal area. The first flat seal area is arranged close to the first pole ear seal portion, the second flat seal area is arranged close to the second pole ear seal portion, and the groove seal area is arranged between the first flat seal area and the second flat seal area; The groove sealing area includes a straight edge area and a first bevel edge area and a second bevel edge area located on both sides of the straight edge area. The straight edge area, the first bevel edge area and the second bevel edge area together form a groove shape. The first bevel edge area is arranged at the connection between the first flat mouth sealing area and the straight edge area and is inclined. The second bevel edge area is arranged at the connection between the second flat mouth sealing area and the straight edge area and is inclined.

3. The battery cell packaging structure according to claim 2, characterized in that: The sealing widths of the first flat seal area, the second flat seal area, and the groove seal area satisfy the following relationship: 2mm≤W1=W5≤W2=W4≤W3≤6mm Among them, W1 is the sealing width of the first flat sealing area, W2 is the sealing width of the first bevel area, W3 is the sealing width of the straight edge area, W4 is the sealing width of the second bevel area, and W5 is the sealing width of the second flat sealing area.

4. The battery cell packaging structure according to claim 3, characterized in that: A first rounded corner is formed between the first flat sealing area and the first beveled edge area, a second rounded corner is formed between the first beveled edge area and the straight edge area, a third rounded corner is formed between the second beveled edge area and the straight edge area, and a fourth rounded corner is formed between the second flat sealing area and the second beveled edge area. The angle range of the first rounded corner, the second rounded corner, the third rounded corner and the fourth rounded corner is between 20° and 90°.

5. The battery cell packaging structure according to claim 3, characterized in that: A distance W7 between the top of the straight edge area and the top of the packaging material satisfies the following relationship: 3 mm ≤ W7 ≤ 9 mm.

6. The battery cell packaging structure according to claim 3, characterized in that: The distances between the two ends of the groove sealing area and the first pole tab and the second pole tab satisfy the following relationship: 4mm≤a≤15mm, 4mm≤b≤15mm Among them, a is the distance between one end of the groove sealing area close to the first pole ear and the first pole ear, and b is the distance between one end of the groove sealing area close to the second pole ear and the second pole ear.

7. The battery cell packaging structure according to claim 1, characterized in that: The sealing area is in a continuous corrugated shape, the top seal area includes a third flat seal area, a fourth flat seal area, and a corrugated seal area, and the corrugated seal area is arranged between the third flat seal area and the fourth flat seal area; The corrugated sealing area includes a plurality of circular arcs, which are connected end to end and connected between the third flat sealing area and the fourth flat sealing area.

8. The battery cell packaging structure according to claim 7, characterized in that: The sealing widths of the third flat seal area, the fourth flat seal area, and the corrugated seal area are the same.

9. The battery cell packaging structure according to claim 7, characterized in that: The distance d between the end of the corrugated seal area close to the second pole ear and the pole ear glue of the second pole ear satisfies the following relationship: 1mm≤d≤10mm; the height difference h between the highest point or the lowest point of each arc and the plane where its endpoint is located satisfies the following relationship: 0.02mm≤d≤ 0.06mm.

10. A battery, characterized in that: include: A battery body and a battery cell packaging structure as described in any one of claims 1 to 9, wherein the packaging material is used to seal the battery body, and the top seal area is located at the top of the battery body.

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