Battery cell packaging structure, battery, and electronic device

Abstract

This application provides a battery cell packaging structure, a battery, and an electronic device, belonging to the field of battery manufacturing. It includes: a battery cell body, tabs, tab films, and a top seal. The battery cell body has a top cover. A first tab film covers the tabs, and the top seal covers the tab film. The top seal includes a preset region, a first bending position, and a second bending position. The second bending position passes through the preset region. The top seal is bent sequentially along the first and second bending positions, and the bent top seal is superimposed on the top cover. The first bending position is close to the battery cell body, and the second bending position is away from the battery cell body. The preset region includes a non-bending area and a bending area. The first tab film is disposed in the non-bending area, and the bending area coincides with the second bending position. The overall hardness of the structure formed along the thickness direction of the battery cell packaging structure in the bending area is less than the overall hardness of the structure formed along the thickness direction of the battery cell packaging structure in the non-bending area. This structure allows for multiple bending of the top seal.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cell packaging structure, battery, and electronic device. Background Technology

[0002] As a core carrier of modern energy technology, lithium batteries have experienced rapid market expansion in recent years, driven by global energy transition and technological innovation. Due to their high energy density, long cycle life, and lack of memory effect, lithium-ion batteries have become the core energy carrier for mobile terminal devices such as smartphones, digital cameras, and laptops.

[0003] In battery manufacturing, precise heat sealing of the top and side sealing areas is required to ensure the sealing reliability of the battery cell. However, the current folded top sealing process faces a technical bottleneck when dealing with thinner cells, such as those with a thickness of 4.85mm. After the top sealing process, the sealing edge structure protrudes beyond the cell's outline, causing the overall battery thickness to exceed the standard. This defect directly prevents traditional folded top sealing technology from meeting the industrial production requirements of ultra-thin cells. This technical limitation has become a key process obstacle restricting the development of ultra-thin lithium-ion batteries. Utility Model Content

[0004] In view of this, this application provides a cell packaging structure, a battery, and an electronic device to solve the technical problem that when the top seal edge is bent, part of the top seal edge will extend beyond the cell, resulting in the battery thickness exceeding the standard.

[0005] Some embodiments of this application provide a cell packaging structure. The application is described below from multiple aspects, and the embodiments and beneficial effects of these aspects can be referred to each other.

[0006] In a first aspect, this application provides a battery cell packaging structure, comprising: a battery cell body, tabs, and a top sealing edge; the battery cell body having a top cover; tabs extending from the surface of the top cover; a first tab film covering the tabs, and the top sealing edge covering the tab film; the top sealing edge including a preset region, a first bending position, and a second bending position, the second bending position passing through the preset region, the top sealing edge being bent sequentially along the first bending position and the second bending position, the bent top sealing edge being superimposed on the top cover; the first bending position being a position close to the battery cell body, the second bending position being a position away from the battery cell body, the preset region including a non-bending region and a bending region, the first tab film being disposed in the non-bending region, the bending region coinciding with the second bending position; the entire structure located in the bending region along the thickness direction of the battery cell packaging structure being bendable.

[0007] According to the battery cell packaging structure of the present invention, the entire structure located in the bending area along the thickness direction of the battery cell packaging structure is bendable. Therefore, the top seal edge can be bent multiple times, avoiding the top seal edge exceeding the thickness of the battery cell body in a single bend, thus preventing an increase in battery thickness. Simultaneously, it can reduce the length space of the battery cell, effectively improving the space utilization and energy density of the battery cell packaging structure. Furthermore, the structure of the seal and ear tabs on the top seal edge is improved to facilitate bending of the top seal edge and prevent the ear tabs from hardening due to compression during bending, thus reducing the difficulty of the bending process.

[0008] In one embodiment of the first aspect, the ear piece located in the bending area includes at least two first ear pieces, the two first ear pieces forming a first gap along the length direction of the cell body, the first gap covering the bending area. By setting the first gap, during the top sealing edge compaction and encapsulation, the location of the entirety (hereinafter referred to as the overlapping portion) formed along the thickness direction of the cell encapsulation structure in the bending area can be prevented from hardening, thereby enabling bending.

[0009] In one embodiment of the first aspect, the ear tab further includes a second ear tab disposed within a first gap between the two first ear tabs, the second ear tab being thinner than the first ear tab. By differentiating the ear tab thicknesses, during encapsulation, the ear tab within the first gap is thinner, resulting in a significantly reduced hardness at the corresponding position after encapsulation compared to the thicker position of the ear tab. This not only reduces the difficulty of bending but also effectively prevents short circuits between the metal tab and the aluminum-plastic film.

[0010] In one embodiment of the first aspect, a first top seal is provided on the top sealing edge, and the first top seal is not sealed at the position relative to the bending area. By not sealing at the corresponding position of the earpiece, the hardening of the earpiece after sealing can be effectively prevented. Not sealing allows the material at the overlapping portion to remain soft, thus facilitating bending.

[0011] In one embodiment of the first aspect, at least two second top seals are provided on the top sealing edge, with a second gap formed between every two second top seals, the second gap covering the bending area. The provision of the second gap can prevent the earpiece from hardening at the corresponding position, which is conducive to the formation of the bending line.

[0012] In one embodiment of the first aspect, the bent top seal includes: a first bent top seal, which is superimposed on the top cover and has a first adhesive dot between it; and a second bent top seal, which is connected to and superimposed on the first bent top seal, and has a second adhesive dot between the second and first bent top seals. The design of the first and second adhesive dots facilitates a firm connection between the layers of the top seal, resulting in a better sealing effect.

[0013] In one embodiment of the first aspect, the second bent top seal edge has first cut angles on both sides along the width direction of the cell body. This structure can avoid redundant edges on both sides of the top seal while ensuring an effective sealing width, and prevent the top corner position from increasing the side length of the cell.

[0014] In one embodiment of the first aspect, the top sealing edge further includes a third bending position, and the top sealing edge is further bent along the third bending position, the bent top sealing edge further including:

[0015] The third bend top edge is connected to the second bend top edge and is superimposed on the second bend top edge.

[0016] In one embodiment of the first aspect, a third adhesive element is provided between the third bent top seal and the second bent top seal. This improves the connection strength between the third bent top seal and the second bent top seal.

[0017] In one embodiment of the first aspect, the third bent top seal edge is provided with second cut angles on both sides along the width direction of the cell body. This can avoid redundant edges on both sides of the top seal and prevent the top corner position from increasing the side length of the cell.

[0018] In one embodiment of the first aspect, the first cutting angle and the second cutting angle are integrally formed into a single cutting angle.

[0019] In one embodiment of the first aspect, the angle of the first cutting angle and / or the angle of the second cutting angle are acute, right, obtuse or straight.

[0020] Secondly, this application also provides a battery, including: a casing, and a cell packaging structure as explained in the first aspect embodiment, wherein the casing is packaged on the outer periphery of the cell packaging structure.

[0021] Thirdly, this application also provides an electronic device including the battery explained in the second aspect. Attached Figure Description

[0022] Figure 1 These are schematic diagrams of the battery packaging structure in some embodiments;

[0023] Figure 2A To and Figure 1 The corresponding front view and side view of the battery packaging structure after packaging;

[0024] Figure 2B This is a schematic diagram of the cell packaging structure in some other embodiments;

[0025] Figure 3 This is a front view schematic diagram of a battery cell packaging structure according to an embodiment of this application;

[0026] Figure 4 for Figure 3 Partial schematic diagrams of the three-dimensional and side views of the battery cell packaging structure are shown.

[0027] Figure 5 This is a schematic diagram of the structure of an ear patch according to an embodiment of this application;

[0028] Figure 6 and Figure 5 A schematic diagram of the corresponding battery cell packaging structure before packaging;

[0029] Figure 7 This is a schematic diagram of the structure of an ear patch according to another embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the top seal of a battery cell packaging structure according to an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the top seal of a battery cell packaging structure according to another embodiment of this application;

[0032] Figure 10 This is a front view schematic diagram of a cell packaging structure according to another embodiment of this application;

[0033] Figure 11 for Figure 10 Partial schematic diagrams of the three-dimensional and side views of the battery cell packaging structure are shown.

[0034] Figure 12 This is a schematic diagram of the ear patch structure of an embodiment of the top sealing edge triple bending according to this application;

[0035] Figure 13 To and Figure 12 A schematic diagram of the corresponding battery cell packaging structure before packaging;

[0036] Figure 14 This is a schematic diagram of the ear patch structure of another embodiment of the top sealing edge triple bending in this application;

[0037] Figure 15 This is a schematic diagram of the top seal of a battery cell packaging structure according to one embodiment;

[0038] Figure 16 This is a schematic diagram of the top seal of a battery cell packaging structure according to another embodiment of this application.

[0039] Figure label:

[0040] Some examples:

[0041] 10. Cell packaging structure; 11. Cell body; 12. Top sealing edge; 13. Electrode tab; 14. Ear tab;

[0042] This application:

[0043] Cell packaging structure 100;

[0044] Battery cell body 110; Top cover 111;

[0045] Top sealing edge 120; First top sealing seal 121; Hollowed-out 1211; Second top sealing seal 122; Second interval 123; First bent top sealing edge 124; Second bent top sealing edge 125; First cutting angle 1251; First glued part 126; Second glued part 127; Third bent top sealing edge 128; Second cutting angle 1281; Third glued part 129;

[0046] 130mm earpieces;

[0047] Earpiece 140; First earpiece 141; First spacer 142; Second earpiece 143. Detailed Implementation

[0048] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0049] To facilitate understanding of the technical solution of this application, the terms involved in the embodiments of this application will be explained first.

[0050] In the field of battery packaging technology, to ensure good packaging performance of battery cells, a top seal and side seal of a certain width are typically required. The top seal refers to the packaging of the side of the cell body where the leads emerge. The top seal packaging process can be called folded top sealing technology or folded edge sealing technology.

[0051] The top-sealing technology refers to bending the sealing edge of the end of the battery cell with the tabs and then sealing the edge through a pressing process, such as hot pressing. The sealing edge at the end of the battery cell with the tabs is called the top sealing edge.

[0052] The technical problems to be solved by the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0053] refer to Figure 1 and Figure 2A , Figure 1Schematic diagrams of the battery packaging structure in some embodiments are shown. Figure 2A Is with Figure 1 The corresponding front view and side view of the battery packaging structure after packaging.

[0054] like Figure 1 As shown, the battery packaging structure 10 may include a cell body 11, a tab 13 extending from the top cover of the cell body 11, a top sealing edge 12 disposed on one side of the tab 13, and an ear film 14 wrapped around the outer periphery of the tab 13. The top sealing edge 12 is folded along a fold line onto the top cover of the cell body 11, and then pressed and sealed to achieve the top sealing of the battery.

[0055] like Figure 2A The structure shown in (a) is a front view of the battery cell packaging structure before packaging, including the battery cell body 11 and the top sealing edge 12. During packaging, the top sealing edge 12 is bent along a fold line towards the thickness direction of the battery cell body 11 to encapsulate the top surface of the battery cell body 11. Figure 2A As shown in the side view (b), when the thickness of the cell body 11 is greater than the conventional thickness, for example, greater than 4.85 mm, after the top sealing edge 12 is bent, a gap d1 will remain between the top sealing edge 12 and the edge of the cell body 11, indicating that the bent top sealing edge 12 does not exceed the thickness of the cell body 14. This bending method is suitable for cases where the thickness of the cell body 11 is greater than 4.85 mm.

[0056] It should be noted that, Figure 2A The tabs 13 and tabs 14 extending outward from the top seal edge 12, as shown in (b) are not bent here (all the following figures show no bending). In the actual cell manufacturing process, they can be bent as needed, but this will not be described in detail here.

[0057] In other embodiments, when the thickness of the cell body 11 is less than the conventional thickness, such as 4.85 mm, this bending and packaging method cannot meet the requirements. It should be noted that the specific parameter for the thickness of the cell body is only illustrative; in some embodiments, other specific values ​​may also apply. The following embodiments illustrate situations where the current bending method does not meet the requirements.

[0058] refer to Figure 2B , Figure 2B Schematic diagrams of the cell packaging structure in other embodiments are shown. For example... Figure 2B The image (a) shows a front view of the cell body 11 before encapsulation. To ensure an effective sealing width of the top seal, the length h1 of the top seal edge 12 must be sufficient. Figure 2AAs shown in the top-sealing method, when the thickness of the cell body 11 is less than 4.85mm, the top-sealing edge 12, after being bent, will exceed the thickness of the cell body 11. For example... Figure 2B As shown in the side view (b), after the top sealing edge 12 is bent, it exceeds the thickness of the cell body 11, that is, it exceeds the length d2. This causes the cell packaging structure and the thickness of the battery to exceed the standard. If the length of the top sealing edge 12 is reduced, an effective sealing width cannot be guaranteed.

[0059] This application provides a battery cell packaging structure. By repeatedly bending the top sealing edge, the battery cell packaging structure meets the sealing width requirements, thereby enabling the top sealing technology to be applied to situations where the battery cell thickness is less than that of conventional battery cells.

[0060] The cell packaging structure of the present application embodiment will now be described in detail with reference to the accompanying drawings.

[0061] It should be noted that the battery cell packaging structure of the embodiments of this application can be applied to electronic devices, which can be, but are not limited to, various servers, computing clusters, switches, etc., and can also be candybar phones, foldable phones, tablet computers, e-book readers, laptop computers, personal digital assistants (PDAs), notebooks, and other electronic devices.

[0062] In the embodiments of this application, the top sealing edge of the wire encapsulation structure can be bent multiple times. In the following embodiments, the top sealing edge will be bent 2 times and 3 times respectively as examples.

[0063] First, the orientations involved in this document will be explained. In the various figures, the width direction of the battery cell body is the x-axis, the length direction is the y-axis, and the thickness direction is the z-axis. In some embodiments, the width direction of the folded top seal, the thickness direction of the battery cell body, and the width direction of the top cover are the same, and the length direction of the top seal is the same as the length direction of the battery cell body. In some embodiments, when the battery cell body is a square, the length, width, and thickness directions of the battery cell body are perpendicular to each other. In other embodiments, when the battery cell body is not square, such as an irregular structure or approximately square, the length, width, and thickness directions of the battery cell body may not be perpendicular to each other; two directions may be perpendicular, and the third direction may not be perpendicular, or all directions may not be perpendicular.

[0064] refer to Figure 3 and Figure 4 , Figure 3 This paper shows a front view of a battery cell packaging structure 100 according to an embodiment of this application. Figure 4 It shows Figure 3 The diagram shows a partial three-dimensional structure and a side view of the battery cell packaging structure 100.

[0065] like Figure 3 As shown in (a), the battery cell packaging structure 100 includes a battery cell body 110, two tabs 130 extending from the top cover 111 of the battery cell body 110, and a top sealing edge 120 for packaging the top cover 111 of the battery cell body 110. The tabs 130 extend along the length direction of the battery cell body 110, i.e., the y-axis direction, to a certain length, and the two tabs 130 are spaced apart along the width direction of the battery cell body 110, i.e., the x-axis direction. The top sealing edge 120 includes a preset area, a first bend (first bend position), and a second bend (second bend position). The second bend passes through the preset area, which can be understood as the position corresponding to the earpiece 140, and the preset area is divided into a non-bending area and a bending area. The bending area refers to the area where the preset area coincides with the second bend position, and the non-bending area refers to the other preset areas besides the bending area. The earpiece 140 wraps around the tabs 130, and a portion of the earpiece 140 ( Figure 3 (a) The dashed line in the middle ear film 140 is surrounded by the top sealing edge 120. The ear film 140 can protect the tab 130 and is used for insulation.

[0066] When folding the top seal, the top seal edge 120, the tabs 130, and the tab sheet 140 need to be folded together. Figure 3 The broken line (a) shown in the diagram is bent. For example... Figure 3 As shown in (a), before the top seal is folded, the length of the top seal edge 120 is h2. During the top seal folding, an appropriate width can be set, such as... Figure 3 The spacing between the first and second fold lines in (a) is used to fold the top sealing edge 120 back and forth once along the thickness direction of the cell body, achieving two bends. The bent top sealing edges are then stacked sequentially on the top cover 111, resulting in an approximately Z-shaped top sealing edge structure. Figure 2B As shown in (b), the thickness of the cell body 110 is less than the specified thickness, for example, 4.85 mm. After the top sealing edge 120 is bent twice, the width of the top sealing edge 120 is less than the thickness of the cell body 110, thereby avoiding the situation where the top sealing edge 120 exceeds the cell body 110 after bending.

[0067] To better understand the overall structure of the battery cell packaging in this application, please refer to [further details]. Figure 4 , Figure 4 Is with Figure 3 The 3D diagram corresponding to the structure shown. For example... Figure 4 (a) and Figure 4As shown in (b), after the top seal is folded, the overall width of the top seal edge 120 does not exceed the thickness of the cell body 110. This packaging structure not only ensures the overall packaging length requirement of the top seal edge 120, but also prevents the battery thickness from exceeding the standard by ensuring that the top seal edge does not exceed the thickness of the cell body 110.

[0068] In addition, such as Figure 3 As shown in (a), during the aforementioned multiple folding and sealing process, the position corresponding to the second fold line (second bending position) requires bending of the top sealing edge 120, the tab 130, and the ear film 140 simultaneously. However, after pressing, the top sealing edge 120, the tab 130, and the ear film 140 become relatively hard and difficult to bend, increasing the difficulty of the bending process. Therefore, based on this, the embodiments of this application also solve the technical problem of difficulty in bending during multiple bending processes. The embodiments of this application improve the material layering or the material itself of the area where the ear film should be set (preset area) and the overlapping area of ​​the second fold line (bending area), so that the hardness of the material at the overlapping part is less than the hardness of the material at other positions (non-bending areas) corresponding to the ear film. For example, by improving the structure of the earpiece 140 and the top seal, the earpiece 140 can be placed at the intersection with the fold line (also called the bending line in some embodiments) (overlapping portion), or the earpiece at the overlapping portion can be thinner than the earpiece at other positions, or the overlapping portion can be left unsealed, or the earpiece structure design can be combined with the top seal structure design to form a structure that facilitates bending of the top seal edge. This structural design not only allows for multiple bends of the top seal edge 120, making the entire top seal process smoother, but also ensures an effective sealing width without increasing the battery thickness.

[0069] It should be noted that, in this embodiment, to ensure that the top sealing edge is easy to bend, it is only necessary to ensure that the material of the bending area corresponding to the ear tab 140 is soft, thereby facilitating the formation of the bending line. Furthermore, when there are multiple corresponding tabs 130, bending difficulties will occur at the corresponding positions of each tab 130 and ear tab 140. Therefore, this embodiment uses the arrangement of one tab 130 as an example for explanation; the structural design of bending other tabs and ear tabs is the same as in this embodiment, and can be referred to the explanation of this embodiment.

[0070] The following embodiments will be described in conjunction with specific examples.

[0071] In the following embodiments, a specific structure and process for forming a bend line are described.

[0072] refer to Figure 5 and Figure 6 , Figure 5A schematic diagram of the structure of an ear patch according to an embodiment of this application is shown. Figure 5 Image (a) is a front view of the earpiece. Figure 5 (b) in the figure is a side view of the earpiece. Figure 6 It shows the relationship with Figure 5 The diagram shows the corresponding battery cell packaging structure before packaging. Because the top seal edge is bent twice after heat sealing, the ear tab will be bent once during the second bend (the fold line closest to the battery cell body is not affected by the heat sealing). Therefore, considering that the bent area will harden during heat sealing, a gap (first interval 142) can be provided at the location where the two fold lines overlap with the ear tab (the bending area) to prevent the area corresponding to this gap from being affected by heat sealing and hardening. Figure 5 As shown in (a) and (b), the tab 130 is covered by an earpiece 140, which is divided into two segments, namely two first earpieces 141. A first gap 142 is provided between the two first earpieces 141. Figure 6 As shown, the first top seal 121 covers the top seal edge 120. During heat sealing, the presence of the first gap 142 prevents the gap from being fully compressed during heat sealing. As a result, the position of the first gap 142 will not be completely heat sealed, nor will it harden due to heat sealing, thus making it easy to bend.

[0073] In other embodiments, not only the ease of bending must be considered, but also the insulation of the tabs. Embodiments of this application further improve the structure of the tab.

[0074] refer to Figure 7 , Figure 7 A schematic diagram of the structure of an ear patch according to another embodiment of this application is shown. Figure 7 Image (a) is a front view of the earpiece. Figure 7 (b) in the image is a side view of the earpiece. Figure 7 As shown, the tab 130 is wrapped with two first tab sheets 141 and one second tab sheet 143. The second tab sheet 143 (thin sheet) is thinner than the first tab sheets 141 (thick sheet), and is positioned between the two first tab sheets 141, coinciding with the bending area. During pressing, because the second tab sheet 143 is thinner than the first tab sheets 141 on both sides, a gap exists at this position when the top sealing edge is pressed, preventing it from being compacted and hardened (while the material at the corresponding position of the first tab sheets 141 will be compacted and hardened), thus facilitating bending. Furthermore, the second tab sheet 143 has an insulating function, providing insulation.

[0075] The ear tabs in this embodiment are designed with thin and thick thicknesses. Thick ear tabs are used to meet the packaging requirements, while thin ear tabs can not only prevent short circuits between the metal tabs and the aluminum-plastic film, but also effectively improve the space utilization and energy density of the battery cell packaging structure, and reduce the difficulty of multiple bending of the top seal.

[0076] The following description, in conjunction with the accompanying drawings, illustrates two other embodiments of the bendable structure of this application.

[0077] refer to Figure 8 , Figure 8 A schematic diagram of the top seal of a cell packaging structure according to an embodiment of this application is shown. Figure 8 As shown, a first top seal 121 is located on one side of the top seal edge 120, covering the area after the top seal edge 120 is bent. The first top seal 121 has a cutout 1211 corresponding to the position of the earpiece 140. The cutout 1211 extends along the width direction of the battery cell body 110 and spans the width of the earpiece 140, which is in the same direction as the width direction of the battery cell body 110. This cutout 1211 is a space to be avoided during heat sealing; that is, the cutout 1211 is not sealed. This prevents the cutout 1211 from hardening under pressure, making it easier to bend.

[0078] It should be noted that when the embodiments of this application employ, as shown in the example... Figure 8 When the top seal with the hollowed-out 1211 structure is applied, the earpiece 140 can be a single, unsegmented piece, or it can be as shown in the diagram. Figures 5-7 The segmented structure shown, or the segmented structure with varying thicknesses, is not limited here.

[0079] refer to Figure 9 , Figure 9 A schematic diagram of the top seal of a cell packaging structure according to another embodiment of this application is shown. Figure 9 As shown, the top sealing edge 120 is provided with two second top sealing seals 122, forming a second gap 123 between the two second top sealing seals 122. The second gap 123 extends along the width direction of the cell body 110, i.e., the x-axis direction, and passes through both sides of the top sealing edge 120. Since the second gap 123 is not heat-sealed, the material itself will not harden due to heat sealing, thus facilitating bending. Furthermore, this structure does not require modification of the earpiece structure. Because the spacing of the second gaps 123 is small, it does not affect the sealing performance of the top sealing edge.

[0080] In some embodiments, to further ensure a firm connection of the top sealing edge after multiple folds, the top sealing edge of each layer of bending is fixed.

[0081] Return to the above Figure 3As shown in (b), after the top sealing edge is bent twice, the top sealing edge after the first bend is the first bent top sealing edge 124, and the top sealing edge after the second bend is the second bent top sealing edge 125. The first bent top sealing edge 124 is fixed to the top cover 111 by a first adhesive dot 126. The first bent top sealing edge 124 and the second bent top sealing edge 125 are fixed by a second adhesive dot 127. It is understood that the first adhesive dot 126 and the second adhesive dot 127 can be solid adhesive or liquid adhesive; this application does not limit this.

[0082] Furthermore, this application does not limit the location or number of times the adhesive is applied. For example, adhesive can be applied near the bend of the top seal edge, or in the middle of each top seal edge layer, or at multiple locations between each top seal edge layer.

[0083] Continue to refer to the above figure. Figure 3 As shown in (a), in some embodiments, a first cutting angle 1251 is provided on both sides of the top seal edge along the width direction of the cell body 110. The first cutting angle 1251 is an angle formed after the missing part of the top seal edge. The angle of the first cutting angle 1251 can be an acute angle, a right angle, an obtuse angle, or a straight angle. By setting the first cutting angle 1251, redundant corners are avoided after the top seal edge 120 times is bent, thereby increasing the thickness of the top seal edge after encapsulation. By cutting the top corners on both sides of the top seal, it is easier to implement the top seal folding process. On the other hand, it can prevent the excess corners from increasing the thickness of the top seal edge after folding, and also increasing the length of the cell encapsulation structure, which is not conducive to the small size requirements of the battery.

[0084] It should be noted that the size and shape of the first cutting angle 1251 in this application embodiment can be cut according to requirements. As long as the effective sealing width of the top seal is guaranteed, the cutting can be carried out according to the actual situation. This application does not limit this.

[0085] The above embodiments illustrate the method of bending the top sealing edge twice. In the following embodiments, the cell packaging structure of this application will be further explained using the method of bending the top sealing edge three times. The three-bend and two-bend embodiments differ only in the number of bends and the bend lines; the other structural and operational principles are the same as the two-bend top sealing edge embodiment described above.

[0086] refer to Figure 10 and Figure 11 , Figure 10 This paper shows a front view of a cell packaging structure 100 according to another embodiment of this application. Figure 11 It shows Figure 10 The diagram shows a partial three-dimensional structure and a side view of the battery cell packaging structure 100.

[0087] like Figure 10 As shown in (a), the battery cell packaging structure 100 includes a battery cell body 110, tabs 130 connected to the battery cell body 110, and a top sealing edge 120 for packaging the top surface of the battery cell body 110. Figure 3 The difference is that the top seal edge 120 has a three-fold line (at the third bend position), and when folding the top seal, the top seal edge 120 is folded three times along the width of the top cover. The folded top seal edges are then stacked on top of the top cover, resulting in an approximately S-shaped top seal edge structure. Figure 10 As shown in (b), the thickness of the cell body 11 is less than 4.85 mm. After the top sealing edge is bent 3 times, the width of the top sealing edge 120 is less than the thickness of the cell body 110.

[0088] like Figure 11 (a) and Figure 11 As shown in (b), after the top seal is folded, the overall width of the top seal edge 120 does not exceed the thickness T of the cell body. This packaging structure not only ensures the overall packaging length requirement of the top seal edge, but also prevents the battery thickness from exceeding the standard by ensuring that the top seal edge does not exceed the thickness of the cell body.

[0089] Because the second and third bending lines become difficult or impossible to bend when the top seal edge is folded three times due to the hardening caused by the heat sealing, this embodiment has two bending lines intersecting with the corresponding area of ​​the ear piece 140 compared to the two bending lines mentioned above. Since one ear piece corresponds to two bending areas, an additional bending area is needed to ensure that the top seal edge 120 can be bent three times. This makes the entire top seal folding process smoother and ensures the effective sealing width without increasing the battery thickness.

[0090] refer to Figure 12 and Figure 13 , Figure 12 A schematic diagram of the ear patch structure of an embodiment of the top edge triple bending according to this application is shown. Wherein, Figure 12 Image (a) is a front view of the earpiece. Figure 12 (b) in the image is a side view. Figure 13 It shows the relationship with Figure 12 The corresponding cell packaging structure is shown in the schematic diagram before packaging. Since the top sealing edge needs to be bent three times after heat sealing, the area corresponding to the ear piece will be bent twice. Therefore, two gaps (first interval 142) can be set at the position corresponding to the ear piece during bending so that the position corresponding to the gap will not be affected by heat sealing and will not harden.

[0091] like Figure 12As shown in (a) and (b), the tab 130 is wrapped with an ear patch 140, which is divided into three segments, namely three first ear patches 141, and a first interval 142 is provided between every two first ear patches 141, that is, there are two first intervals 142, where each first interval 142 corresponds to a bending area. When sealed, as... Figure 13 As shown, the first top seal 121 covers the top seal edge 120. During heat sealing, the presence of the first gap 142 prevents the gap from being fully compressed during heat sealing. As a result, the position of the first gap 142 will not be completely heat sealed, nor will it harden due to heat sealing, thus making it easy to bend.

[0092] refer to Figure 14 , Figure 14 A schematic diagram of the ear patch structure of another embodiment of the top sealing edge triple bending of this application is shown. Wherein, Figure 14 Image (a) is a front view of the earpiece. Figure 14 (b) in the image is a side view of the earpiece. Figure 14 As shown, the tab 130 is wrapped with three first tab sheets 141 and two second tab sheets 143. The thickness of the second tab sheets 143 (thin sheets) is less than the thickness of the first tab sheets 141 (thick sheets), and the two second tab sheets 143 are respectively positioned between the gaps formed by the three first tab sheets 141. Each second tab sheet 143 corresponds to a bending area. During pressing, because the second tab sheet 143 is thinner than the first tab sheets 141 on both sides, a gap exists at this position, preventing it from being compressed and hardened, thus facilitating bending. Furthermore, the second tab sheets 143 have an insulating function, providing insulation.

[0093] The ear tabs in this embodiment are designed with thin and thick thicknesses. Thick ear tabs are used to meet the packaging requirements, while thin ear tabs can not only prevent short circuits between the metal tabs and the aluminum-plastic film, but also effectively improve the space utilization and energy density of the battery cell packaging structure, and reduce the difficulty of multiple bending of the top seal.

[0094] refer to Figure 15 , Figure 15 A schematic diagram of the top seal of a cell packaging structure according to an embodiment of this application is shown. Figure 15As shown, a first top seal 121 is located on one side of the top seal edge 120, covering the area after the top seal edge is bent. The first top seal 121 has two cutouts 1211 corresponding to the position of the earpiece 140, with the two cutouts 1211 spaced vertically as shown in the figure. The cutouts 1211 extend along the width direction of the battery cell body 110 and span the width of the earpiece 140. Each cutout 1211 corresponds to a bending area. No seal is provided at this cutout 1211, allowing bending even with an earpiece present.

[0095] It should be noted that when the top seal with a hollowed-out 1211 structure is used in the embodiments of this application, the earpiece 140 can be integral or as shown in Figure 15. Figures 12-14 The structure shown is not limited here.

[0096] refer to Figure 16 , Figure 16 A schematic diagram of the top seal of a cell packaging structure according to another embodiment of this application is shown. Figure 16 As shown, the top sealing edge 120 has three second top sealing seals 122, with a second gap 123 formed between every two second top sealing seals 122. The second gap 123 covers the bending area. Because the second gap 123 is not heat-sealed, the material itself does not harden due to heat sealing, thus facilitating bending, and this structure does not require modification to the earpiece mechanism. Because the spacing of the second gaps 123 is small, it does not affect the sealing performance of the top sealing edge.

[0097] Return to the above Figure 10 As shown in (b), after the top sealing edge is bent twice, the top sealing edge after the first bend is the first bent top sealing edge 124, the top sealing edge after the second bend is the second bent top sealing edge 125, and the top sealing edge after the third bend is the third bent top sealing edge 128. The first bent top sealing edge 124 is fixed to the top cover 111 by the first adhesive applicator 126. The first bent top sealing edge 124 and the second bent top sealing edge 125 are fixed by the second adhesive applicator 127, and the second bent top sealing edge 125 and the third bent top sealing edge 128 are fixed together by the third adhesive applicator 129. It is understood that the adhesive applicator can be a solid adhesive or a liquid adhesive; this application is not limited in this regard.

[0098] Continue to refer to the above figure. Figure 10As shown in (a), in some embodiments, second cutting angles 1281 are provided on both sides of the top seal edge along the width direction of the cell body 110. These second cutting angles 1281 are angles formed after the missing edge of the top seal edge. The angle of the second cutting angle 1281 can be an acute angle, a right angle, an obtuse angle, or a straight angle. The setting of the second cutting angles 1281 can prevent redundant corners from forming on the top seal edge after multiple bends (120 times), thus avoiding an increase in the thickness of the encapsulated top seal edge. By cutting the top seal angles on both sides, the top seal folding process is easier to implement, and excess corners can prevent the thickness of the folded top seal edge from increasing, which also increases the length of the cell encapsulation structure, thus hindering the battery's small size requirements.

[0099] It should be noted that the second cutting angle 1281 in this embodiment can be disposed on the third bent top sealing edge 128 or on the second bent top sealing edge 125; this application is not limited in this regard. Furthermore, the size and shape of the second cutting angle 1281 can be cut according to requirements, as long as the effective sealing width of the top seal is guaranteed; this application is not limited in this regard.

[0100] In summary, the battery cell packaging structure according to the embodiments of this application employs at least two-fold top sealing technology to trim the top corners on both sides of the top seal, preventing the top corner position from increasing the side length of the battery cell and reducing the overall length of the battery cell packaging structure in the length direction; at the same time, the structure of the tabs, such as segmented spacing or thickness differentiation design, enables the thicker tabs to be used for packaging, while the thinner tabs are used to prevent short circuits between the metal tabs and the aluminum-plastic film, effectively improving the space utilization and energy density of the battery cell packaging structure.

[0101] This application also discloses a battery comprising the components described in the above embodiments. Figures 3 to 16 The cell packaging structure is explained. The battery has the structure and performance described in the cell packaging structure.

[0102] This application also discloses an electronic device including the battery explained in the above embodiments. The electronic device has the structure and performance described for the battery.

[0103] It should be noted that the parallelism in this application is not absolute. Approximate parallelism due to processing and assembly errors (e.g., an angle of 0.1° between two structural features) is also within the scope of parallelism in this application. Similarly, the axial symmetry in this application is not absolute. Approximate axial symmetry due to processing and assembly errors (e.g., a partial structure offset by a certain distance or angle relative to the axis of symmetry) is also within the scope of axial symmetry in this application. Likewise, the central symmetry in this application is not absolute. Approximate central symmetry due to processing and assembly errors (e.g., a partial structure offset by a certain distance or angle relative to the axis of symmetry) is also within the scope of central symmetry in this application. This application does not impose specific limitations in these respects.

[0104] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0105] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0106] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will be able to understand the specific meaning of the above terms in this application based on the specific circumstances.

[0107] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery cell packaging structure, characterized in that, include: The battery cell body, terminals, ear tabs, and top seal. The battery cell body has a top cover; The electrode extends from the surface of the top cover; The earpiece includes a first earpiece, the first earpiece covering the electrode ear, and the top sealing edge covering the earpiece; The top sealing edge includes a preset area, a first bending position, and a second bending position. The second bending position passes through the preset area. The top sealing edge bends sequentially along the first bending position and the second bending position. The bent top sealing edge is superimposed on the top cover. The first bending position is close to the battery cell body, and the second bending position is away from the battery cell body. The preset area includes a non-bending area and a bending area. The first earpiece is disposed in the non-bending area, and the bending area coincides with the second bending position. The entire structure located in the bending region is bendable along the thickness direction of the cell packaging structure.

2. The electric cell packaging structure according to claim 1, wherein, The earpiece located in the bending area includes at least: Two first earpieces are provided, and the two first earpieces form a first gap along the length direction of the battery cell body, and the first gap covers the bending area.

3. The electric cell packaging structure according to claim 2, wherein The ear patch further includes a second ear patch covering the electrode ear, the second ear patch being disposed within the first interval between the two segments of the first ear patch, and the thickness of the second ear patch being less than the thickness of the first ear patch.

4. The electric cell packaging structure according to any one of claims 1 to 3, wherein The top seal edge is provided with a first top seal seal. The first top seal is not sealed relative to the position of the bending area.

5. The electric cell packaging structure according to any one of claims 1 to 3, wherein At least two second top seals are provided on the top sealing edge, and a second gap is formed between every two second top seals, the second gap covering the bending area.

6. The electric cell packaging structure according to any one of claims 1 to 3, wherein The top sealing edge after bending includes: The first bent top seal is superimposed on the top cover, and a first adhesive dot is provided between them; The second bent top seal is connected to the first bent top seal and is superimposed on the first bent top seal. A second adhesive element is provided between the second bent top seal and the first bent top seal.

7. The electric cell packaging structure of claim 6, wherein, The second bent top sealing edge has a first cutting angle on both sides along the width direction of the cell body.

8. The electric cell packaging structure of claim 7, wherein, The top sealing edge further includes a third bend position, and the top sealing edge is further bent along the third bend position. The bent top sealing edge further includes: The third bend top sealing edge is connected to the second bend top sealing edge and is superimposed on the second bend top sealing edge.

9. The cell packaging structure according to claim 8, characterized in that, A third adhesive element is provided between the third bent top sealing edge and the second bent top sealing edge.

10. The cell packaging structure according to claim 9, characterized in that, The third bent top sealing edge has a second cutting angle on both sides along the width direction of the cell body.

11. The cell packaging structure according to claim 10, characterized in that, The first cutting angle and the second cutting angle form a cutting angle.

12. The cell packaging structure according to claim 10 or 11, characterized in that, The angle of the first cutting angle and / or the angle of the second cutting angle are acute, right, obtuse or straight.

13. A battery, characterized in that, include: The housing, and the cell packaging structure according to any one of claims 1-12, wherein the housing is encapsulated on the outer periphery of the cell packaging structure.

14. An electronic device, characterized in that, Includes the battery as described in claim 13.

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