Battery cell and battery

Abstract

The utility model provides a battery cell and a battery, and relates to the technical field of batteries. According to the battery cell provided by the invention, the first packaging section and the second packaging section are used as the packaging sections connected with each other, so that the packaging strength of the top package on the battery cell body can be improved, and on the basis, the first packaging section is positioned on one side where the rear accommodating space is positioned; therefore, the extending direction of the first packaging section is shifted to the side where the rear accommodating space is located relative to the extending direction of the second packaging section along the length direction. Therefore, the first packaging section has an extension component perpendicular to the length direction, and the extension component enables the size occupied by the first packaging section in the length direction to be reduced. According to the battery cell provided by the invention, under the condition that the packaging strength of the top seal which is the same as that of the battery cell in the prior art can be achieved, the height of the top seal can be reduced through the arrangement mode of the first packaging section, so that the length of the battery cell is favorably reduced, and the space occupied by the battery cell is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery. Background Art

[0002] In the current battery industry, such as mobile phone batteries, batteries typically consist of a cell, adhesive tape, a battery protection plate, and packaging materials. The cell is typically encapsulated within a housing that holds the electrode assembly. This top seal, along with the battery protection plate and electrode sheets, is often located on the same side of the cell. To ensure the strength of the electrode assembly, the top seal is often made relatively long. This, however, increases the overall length of the battery, making it longer and taking up more space. Utility Model Content

[0003] In view of this, the present application provides a battery cell and a battery, the purpose of which is to solve the above technical problems to a certain extent.

[0004] The present application provides a battery cell, wherein the battery cell has a length direction and comprises:

[0005] A battery cell body having an end portion;

[0006] A packaging shell is arranged outside the battery cell body, and the packaging shell includes a top seal, and the top seal is arranged on one side of the packaging shell in the length direction;

[0007] The top seal includes a first packaging section and a second packaging section connected to each other, the second packaging section extends along the length direction, the second packaging section divides the end into a front accommodating space and a rear accommodating space, and the first packaging section is located on the side where the rear accommodating space is located;

[0008] The battery cell has a tab that passes through the first packaging section and extends to the outside.

[0009] According to the above technical features, the first and second packaging segments, as interconnected packaging segments, can both increase the packaging strength of the top seal on the battery cell body. Furthermore, the first packaging segment is located to the side of the rear accommodating space. This means that the extension direction of the first packaging segment is offset to the side of the rear accommodating space relative to the longitudinal extension of the second packaging segment. As a result, the first packaging segment has an extension component perpendicular to the longitudinal direction (e.g., the thickness direction of the battery cell body), which reduces the length dimension occupied by the first packaging segment.

[0010] Therefore, even if the first packaging segment is a segment that increases the length of the top seal, the first packaging segment can be arranged in this way to reduce the size of the top seal occupied by the first packaging segment in the length direction. In other words, while achieving the same packaging strength of the top seal as the battery cell in the prior art, the height of the top seal can be made smaller through the aforementioned arrangement of the first packaging segment, which is beneficial to reducing the length of the battery cell and reducing the space occupied by the battery cell.

[0011] Preferably, the top seal further comprises a third packaging segment, the third packaging segment is connected to an end of the first packaging segment away from the second packaging segment, and the third packaging segment extends along the length direction;

[0012] The tab passes through the third packaging section and extends to the outside.

[0013] Preferably, the battery cell further has a thickness direction intersecting with the length direction, and the battery cell further comprises a tab glue layer, and the tab comprises a first portion extending along the length direction and a second portion extending along the thickness direction;

[0014] The tab adhesive layer is coated on the outer side of the first portion, and the tab adhesive layer is bonded to a side of the third packaging segment away from the first packaging segment.

[0015] Preferably, the dimension H of the tab rubber layer in the length direction satisfies 0.2 mm ≤ H ≤ 2.0 mm.

[0016] Preferably, a dimension D of the top seal in the length direction satisfies 1 mm ≤ D ≤ 3 mm.

[0017] The present application provides a battery cell, wherein the battery cell has a length direction and comprises:

[0018] A battery cell body having an end portion;

[0019] A packaging shell is arranged outside the battery cell body, and the packaging shell includes a top seal, and the top seal is arranged on one side of the packaging shell in the length direction;

[0020] The top seal includes a first packaging segment and a second packaging segment connected to each other, the first packaging segment and the second packaging segment extending along the length direction; along the length direction, the length of the first packaging segment is greater than the length of the second packaging segment; the second packaging segment divides the end portion into a front accommodating space and a rear accommodating space, and the end of the first packaging segment is bent toward the rear accommodating space;

[0021] The battery cell has a tab that passes through the second packaging section and extends to the outside.

[0022] According to the above technical features, the first and second packaging segments, as interconnected packaging segments, can both increase the packaging strength of the top seal on the battery cell body. Furthermore, the first packaging segment is longer than the second packaging segment, and the end of the first packaging segment faces the side where the rear accommodation space is located, meaning that the first and second packaging segments form a folded position. As a result, the length dimension occupied by the first packaging segment is equal to the length dimension already occupied by the second packaging segment, thereby reducing the length dimension occupied by the top seal.

[0023] In other words, while achieving the same top seal packaging strength as that of the battery cell in the prior art, the height of the top seal can be made smaller through the arrangement of the above-mentioned first packaging section, which is beneficial to reducing the length of the battery cell and reducing the space occupied by the battery cell.

[0024] Preferably, the battery core further comprises a fixing adhesive layer, wherein the fixing adhesive layer is connected between the end portion and the first packaging segment to fix the first packaging segment to a side of the second packaging segment facing away from the front accommodating space.

[0025] Preferably, the battery core further includes a reinforcing member, and the reinforcing member is coated on a side of the first packaging segment and / or the second packaging segment away from the end.

[0026] Preferably, the battery cell also has a thickness direction intersecting with the length direction, and the tab includes a first part extending along the length direction and a second part extending along the thickness direction; the battery cell also includes a tab glue layer, and the tab glue layer is coated on the outside of the first part.

[0027] Preferably, the dimension H of the tab rubber layer in the length direction satisfies 0.2 mm ≤ H ≤ 2.0 mm.

[0028] Preferably, a dimension D of the top seal in the length direction satisfies 1 mm ≤ D ≤ 3 mm.

[0029] The present application also provides a battery, comprising a battery protection board and the battery cell as described above;

[0030] The battery protection plate is disposed in the front accommodation space, and the battery protection plate is configured such that a thickness direction is the same as a length direction.

[0031] The battery provided by this application, unlike the prior art method of arranging the battery protection plate vertically (i.e., the PCB in the battery protection plate is vertical), is arranged so that the thickness direction (essentially, the thickness direction of the PCB) is the same as the length direction. This is equivalent to arranging the battery protection plate horizontally, further reducing the battery's length. Furthermore, placing the battery protection plate within the front storage space helps ensure a more compact battery structure.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram showing an exploded view of a battery provided according to an embodiment of the present application;

[0035] Figure 2 A schematic diagram showing a cross-sectional view of a battery cell provided according to an embodiment of the present application;

[0036] Figure 3 A schematic diagram showing a cross-sectional view of another battery cell provided according to an embodiment of the present application is shown;

[0037] Figure 4 A schematic diagram showing a cross-sectional view of another battery cell provided according to an embodiment of the present application is shown;

[0038] Figure 5 A schematic diagram showing a plan view of a partial structure of a battery cell provided according to an embodiment of the present application;

[0039] Figure 6 Shown based on Figure 4 A schematic diagram of a cross-sectional view of a complete battery structure;

[0040] Figure 7 Shown based on Figure 4 Schematic diagram of a cross-sectional view of another complete battery structure.

[0041] Reference numerals:

[0042] 100 - battery cell; 110 - tab; 111 - first part; 112 - second part; 120 - battery cell body; 121 - end; 20 - package shell; 200 - top seal; 210 - first package section; 220 - second package section; 230 - third package section; 300 - tab adhesive layer;

[0043] 400-battery protection board; 410-components; 420-PCB; 500-fixed adhesive layer; 600-reinforcement member; 710-adhesive tape; 720-nickel sheet; 730-injection molding compound; 700-length direction; 810-front accommodation space; 820-rear accommodation space; 900-thickness direction. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0045] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0047] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0048] According to the first aspect of the embodiment of the present application, a battery cell is provided. Figures 1 to 7Describe in detail the structure and working principle of the battery.

[0049] According to an embodiment of the present application, a battery cell is provided, and the battery cell has a length direction 700. In the embodiment, the battery cell 100 includes a battery cell body 120, the battery cell body 120 has an end 121, and the packaging case 20 is disposed outside the battery cell body 120. The packaging case 20 includes a top seal 200, and the top seal 200 is disposed on one side of the packaging case 20 in the length direction 700.

[0050] In the embodiment, the top seal 200 includes a first packaging segment 210 and a second packaging segment 220 connected to each other. The second packaging segment 220 extends along the length direction 700. The second packaging segment 220 divides the end 121 into a front accommodating space 810 and a rear accommodating space 820. The first packaging segment 210 is located to one side of the rear accommodating space 820. In the embodiment, the battery cell 100 has a tab 110 that extends from the first packaging segment 210 to the outside.

[0051] Thus, in the battery cell provided by the embodiment of the present application, the first packaging segment 210 and the second packaging segment 220, as interconnected packaging segments, can both increase the packaging strength of the top seal on the battery cell body. Furthermore, the first packaging segment is located to the side of the rear accommodating space, meaning that the extension direction of the first packaging segment is offset to the side of the rear accommodating space relative to the longitudinal extension of the second packaging segment. Consequently, the first packaging segment 210 has an extension component perpendicular to the longitudinal direction 700, which reduces the size of the first packaging segment 210 in the longitudinal direction 700.

[0052] Therefore, even if the first packaging segment 210 is a segment that increases the length of the top seal 200, the arrangement of the first packaging segment 210 can reduce the size of the top seal 200 occupied by the first packaging segment 210 in the length direction 700. In other words, according to the battery cell provided in the embodiment of the present application, while being able to achieve the same packaging strength of the top seal as the battery cell in the prior art, the height of the top seal can be made smaller through the arrangement of the aforementioned first packaging segment 210, which is beneficial to reducing the length of the battery cell and reducing the space occupied by the battery cell.

[0053] According to the battery cell 100 provided in the embodiment of the present application, as an example, the extension direction of the first packaging segment 210 may intersect with the length direction 700. That is, in the embodiment, the angle between the first packaging segment 210 and the second packaging segment 220 may be greater than 0 degrees and less than 180 degrees. Preferably, the angle between the first packaging segment 210 and the second packaging segment 220 may preferably be 90 degrees to 180 degrees (in this example, due to the intersection of the directions, 90 degrees is included but 180 degrees is not included). Figure 2 As shown, Figure 2In the example shown, the angle between the first packaging segment 210 and the second packaging segment 220 is 90 degrees. In this example, the first packaging segment 210 does not occupy any space in the longitudinal direction 700 due to its extension. It should be noted that the second packaging segment 220 extends straight along the longitudinal direction 700. In other possible implementations, the second packaging segment 220 may be inclined relative to the end 121 of the battery cell 100.

[0054] In an example not shown in the figure, when the angle is greater than 90 degrees, the first packaging segment 210 extends obliquely downward, and not only has a transverse extension component, but also a longitudinal extension component that occupies the dimension in the length direction already occupied by the second packaging segment 220. Therefore, the dimension occupied by the first packaging segment 210 in the length direction 700 is also reduced.

[0055] In addition, although not shown, the angle between the first packaging segment 210 and the second packaging segment 220 can also be, for example, 30 degrees, 45 degrees or 60 degrees, which are angles that are conducive to positioning. In these examples, since the first packaging segment 210 already has a lateral (i.e., horizontal, essentially the thickness direction 900 of the battery cell body 120) extension component, the length dimension occupied by the top seal 200 can also be reduced.

[0056] It should be noted that if Figure 2 As shown, the first packaging segment 210 can be extended by bending the top seal 200 to form the first packaging segment 210 and the second packaging segment 220. Therefore, non-perpendicular transition portions are inevitably left between the first packaging segment 210 and the second packaging segment 220, as well as between the first packaging segment 210 and the third packaging segment 230 described later. Therefore, the terms "extension along a certain direction, parallel to a certain structure, and perpendicularity between packaging segments" in the embodiments of the present application refer to portions other than the transition portions.

[0057] In the embodiment, the top seal 200 is a well-known structure in the battery field. It essentially encapsulates the electrode, separator, and electrolyte of the battery cell 100 to prevent electrolyte leakage. This encapsulation process forms an encapsulation structure formed of an encapsulating material on the top of the battery cell body 120, which is the top seal 200. It is understood that the tab 110 is extended from the top seal 200, and the tab 110 and the top seal 200 are sealed after encapsulation.

[0058] According to the battery provided in the embodiment of the present application, see Figure 2The top seal 200 may further include a third packaging segment 230. The third packaging segment 230 may be connected to an end of the first packaging segment 210 away from the second packaging segment 220. The third packaging segment 230 may extend along the length direction 700. In an embodiment, the tab 110 passes through the third packaging segment 230 and extends to the outside.

[0059] According to the battery cell provided in the embodiment of the present application, the battery cell may further include a tab adhesive layer 300. The tab 110 may include a first portion 111 extending along a length direction 700 and a second portion 112 extending along a thickness direction 900 of the battery cell body. In the embodiment, the tab adhesive layer 300 may be coated on the outside of the first portion 111, and the tab adhesive layer 300 may be bonded to a side of the third packaging segment 230 away from the first packaging segment 210.

[0060] According to the battery cell provided in the embodiment of the present application, the dimension D of the top seal 200 in the length direction 700 satisfies 1mm≤D≤3mm. For example, D can be 1mm to 2.5mm, such as 1.5mm or 2mm. In addition, the dimension H of the tab adhesive layer 300 in the length direction 700 can satisfy 0.2mm≤H≤2.0mm. For example, the tab adhesive layer 300 can be 0.2mm to 1.0mm, such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9mm.

[0061] According to an embodiment of the present application, a battery cell is provided, and the battery cell has a length direction 700. In the embodiment, the battery cell 100 includes a battery cell body 120, the battery cell body 120 has an end 121, and the packaging case 20 is disposed outside the battery cell body 120. The packaging case 20 includes a top seal 200, and the top seal 200 is disposed on one side of the packaging case 20 in the length direction 700.

[0062] In an embodiment, the top seal 200 includes a first packaging segment 210 and a second packaging segment 220 connected to each other. The first packaging segment 210 and the second packaging segment 220 extend along a length direction 700. Along the length direction 700, the length of the first packaging segment 210 is greater than the length of the second packaging segment 220. The second packaging segment 220 divides the end 121 into a front accommodating space 810 and a rear accommodating space 820. The end of the first packaging segment 210 bends toward the rear accommodating space 820. In an embodiment, the battery cell 100 has a tab 110 that extends from the first packaging segment 210 to the outside.

[0063] Thus, in the battery cell provided by the embodiment of the present application, the first and second packaging segments, as interconnected packaging segments, can both increase the packaging strength of the top seal on the battery cell body. Furthermore, the length of the first packaging segment 210 is greater than the length of the second packaging segment 220, and the end of the first packaging segment 210 faces the side where the rear accommodation space is located, meaning that the first packaging segment 210 and the second packaging segment 220 are folded together. As a result, the length dimension occupied by the first packaging segment 210 in the longitudinal direction 700 is the same as the length dimension already occupied by the second packaging segment 220, thereby reducing the length dimension occupied by the top seal 200.

[0064] In other words, according to the battery cell provided in the embodiment of the present application, while being able to achieve the same top seal packaging strength as the battery cell in the prior art, the height of the top seal 200 can be made smaller through the arrangement of the aforementioned first packaging section 210, thereby helping to reduce the length of the battery cell and reduce the space occupied by the battery cell.

[0065] According to the battery cell provided in the embodiment of the present application, in the above example, the angle between the first packaging segment 210 and the second packaging segment 220 is substantially 180 degrees. Here, in order to ensure the stability of the first packaging segment 210, the battery cell may further include a fixing glue layer 500. The fixing glue layer 500 may be connected between the end 121 of the battery cell body 120 and the first packaging segment 210 to fix the first packaging segment 210 to the side of the second packaging segment 220 facing away from the front accommodation space 810. Here, the fixing glue layer 500 may be, for example, a solid formed after the glue is cured or a solid formed after the hot melt adhesive is cooled.

[0066] The battery cell provided in accordance with an embodiment of the present application may further include a reinforcement member 600, which may be coated on a side of the first packaging segment 210 and / or the second packaging segment 220 away from the end 121 of the battery cell body 120. Thus, the reinforcement member 600, which is additionally coated on the first packaging segment 210 and / or the second packaging segment 220, improves the packaging strength of the top seal 200 on the battery cell 100. Therefore, in this example, the top seal 200 formed by the first packaging segment 210 and the second packaging segment 220 can have a smaller dimension in the length direction 700. This is because the presence of the reinforcement member 600 provides the packaging strength that would otherwise be provided by the length of the top seal 200. In an embodiment, as an example, the reinforcement member 600 may be an aluminum-plastic film.

[0067] In addition, similar to the above example, the battery cell provided in accordance with an embodiment of the present application may further include a tab adhesive layer 300. The tab 110 may include a first portion 111 extending along a length direction 700 and a second portion 112 extending along a thickness direction 900 of the battery cell body. In an embodiment, the tab adhesive layer 300 may be coated on the outside of the first portion 111. In this example, the tab may be drawn out from the second packaging segment 220, and the tab adhesive layer 300 may be bonded to the second packaging segment 220.

[0068] Similar to the above example, in the battery cell provided in the embodiment of the present application, the dimension D of the top seal 200 in the length direction 700 satisfies 1mm≤D≤3mm. For example, D can be 1mm to 2.5mm, such as 1.5mm or 2mm. In addition, the dimension H of the tab adhesive layer 300 in the length direction 700 can satisfy 0.2mm≤H≤2.0mm. For example, the tab adhesive layer 300 can be 0.2mm to 1.0mm, such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9mm.

[0069] Furthermore, in the embodiments, the "package strength" referred to above should be understood to include the ability of the top seal 200 to prevent substances within the cell body 120, such as the electrode sheets, separator, and electrolyte, from breaking through the top seal 200 and being exposed. In other words, the greater the package strength, the less likely the aforementioned substances within the cell body 120 are to be exposed.

[0070] According to a second aspect of an embodiment of the present application, a battery is provided, comprising the battery cell 100 as described above, and a battery protection board 400. The battery protection board 400 may be disposed in the front accommodation space 810, and the battery protection board 400 is configured such that the thickness direction is the same as the length direction 700.

[0071] Thus, in the battery provided by the embodiment of the present application, compared to the conventional method of arranging the battery protection board 400 vertically (i.e., the PCB 420 in the battery protection board 400 is in a vertical position), the embodiment of the present application arranges the battery protection board 400 so that its thickness direction (i.e., essentially the thickness direction of the PCB 420) is the same as its length direction 700. This is equivalent to arranging the battery protection board 400 horizontally, further facilitating a reduction in the battery's length dimension 700. Furthermore, disposing the battery protection board 400 within the front accommodation space 810 facilitates a more compact battery structure.

[0072] In an embodiment, the battery may be, for example, a mobile phone battery, ie a polymer battery, such as a lithium polymer battery. Figure 1 As shown, the structure of the battery can generally include a battery cell 100 ( Figure 1In essence, the battery cell 100 is already located in the battery shell), adhesive tape 710 (such as PI adhesive tape 710, i.e. Polyimide, polyimide adhesive tape 710; PET adhesive tape 710, i.e. polyethylene glycol terephthalate, polyethylene terephthalate adhesive tape 710; aramid paper), the above battery protection plate 400 and injection molding adhesive 730.

[0073] See also Figure 6 and Figure 7 , although both are based on Figure 4 The battery structure of the example in FIG, but the posture of the battery protection plate 400 can also be applied to Figure 2 and Figure 3 In the example in FIG. In the embodiment, the battery protection board 400 further includes components 410 integrated on one side of the PCB 420. These components 410 can be arranged toward the battery cell 100, for example, Figure 6 As shown, at this time, the component 410 is located between the PCB 420 and the battery cell 100, the nickel sheet 720 is located on the outside of the PCB 420 and is electrically connected to the tab 110, and the injection molding compound 730 is then encapsulated on the battery protection board 400, the nickel sheet 720 (it can also be a weldable metal such as copper or aluminum), the tab 110 and the outside of the top seal 200 (of course, it can also be encapsulated with adhesive tape 710 or glue).

[0074] like Figure 7 As shown, the aforementioned components 410 can also be arranged toward the side facing away from the battery cell 100, that is, outwardly. In this example, the tab 110 can be bent from the PCB 420 and extend along the PCB 420. The nickel sheet 720 is electrically connected to the tab 110 and is located on the side of the PCB 420 where the components 410 are located. The injection molding compound 730 is then encapsulated on the battery protection board 400 (the nickel sheet 720 can also be a weldable metal such as copper or aluminum), the tab 110, and the outside of the top seal 200 (of course, it can also be encapsulated using adhesive tape 710 or glue).

[0075] According to the third aspect of the embodiment of the present application, an electric device is provided, which includes the battery as described above and also includes the beneficial effects as described above, which will not be repeated here. The electric device can be, for example, a device using a lithium polymer battery, such as a mobile terminal device such as a mobile phone.

[0076] The above are only preferred embodiments of the present application and do not limit the scope of protection of the present application. All equivalent structural transformations made based on the contents of the present application specification and drawings under the innovative concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: The battery cell has a length direction, and the battery cell includes: A battery cell body having an end portion; A packaging shell is arranged outside the battery cell body, and the packaging shell includes a top seal, and the top seal is arranged on one side of the packaging shell in the length direction; The top seal includes a first packaging section and a second packaging section connected to each other, the second packaging section extends along the length direction, the second packaging section divides the end into a front accommodating space and a rear accommodating space, and the first packaging section is located on the side where the rear accommodating space is located; The battery cell has a tab that passes through the first packaging section and extends to the outside.

2. The battery cell according to claim 1, characterized in that The top seal further includes a third packaging segment, the third packaging segment being connected to an end of the first packaging segment away from the second packaging segment, and the third packaging segment extending along the length direction; The tab passes through the third packaging section and extends to the outside.

3. The battery cell according to claim 2, characterized in that The battery cell also has a thickness direction intersecting with the length direction, and the battery cell further includes a tab glue layer, and the tab includes a first portion extending along the length direction and a second portion extending along the thickness direction; The tab adhesive layer is coated on the outer side of the first portion, and the tab adhesive layer is bonded to a side of the third packaging segment away from the first packaging segment.

4. The battery cell according to claim 3, characterized in that The dimension H of the tab rubber layer in the length direction satisfies 0.2 mm ≤ H ≤ 2.0 mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: A dimension D of the top seal in the longitudinal direction satisfies 1 mm ≤ D ≤ 3 mm.

6. A battery cell, characterized in that: The battery cell has a length direction, and the battery cell includes: A battery cell body having an end portion; A packaging shell is arranged outside the battery cell body, and the packaging shell includes a top seal, and the top seal is arranged on one side of the packaging shell in the length direction; The top seal includes a first packaging segment and a second packaging segment connected to each other, the first packaging segment and the second packaging segment extending along the length direction; along the length direction, the length of the first packaging segment is greater than the length of the second packaging segment; the second packaging segment divides the end portion into a front accommodating space and a rear accommodating space, and the end of the first packaging segment is bent toward the rear accommodating space; The battery cell has a tab that passes through the second packaging section and extends to the outside.

7. The battery cell according to claim 6, characterized in that The battery core further includes a fixing adhesive layer connected between the end portion and the first packaging segment to fix the first packaging segment to a side of the second packaging segment facing away from the front accommodating space.

8. The battery cell according to claim 6, characterized in that: The battery core further includes a reinforcing member, which covers a side of the first packaging segment and / or the second packaging segment away from the end portion.

9. The battery cell according to claim 6, characterized in that: The battery cell also has a thickness direction intersecting with the length direction, and the tab includes a first portion extending along the length direction and a second portion extending along the thickness direction; The battery core further includes a tab adhesive layer, which is coated on the outer side of the first part.

10. The battery cell according to claim 9, characterized in that: The dimension H of the tab rubber layer in the length direction satisfies 0.2 mm ≤ H ≤ 2.0 mm.

11. The battery cell according to any one of claims 6 to 10, characterized in that: A dimension D of the top seal in the longitudinal direction satisfies 1 mm ≤ D ≤ 3 mm.

12. A battery, characterized in that: The battery comprises a battery protection board and a battery cell according to any one of claims 1 to 11; The battery protection plate is disposed in the front accommodation space, and the battery protection plate is configured such that a thickness direction is the same as a length direction.

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