Battery cell and electronic equipment

Abstract

The utility model relates to the technical field of battery cells, in particular to a battery cell and electronic equipment. The battery cell comprises a main body part, a first edge folding part, a second edge folding part, a third edge folding part and a fourth edge folding part, the first edge folding part extends from the main body part along a first direction, and the second edge folding part extends from one end, deviating from the main body part, of the first edge folding part along a second direction; the third edge folding part is arranged in the mode that the end, deviating from the first edge folding part, of the second edge folding part extends in the direction opposite to the first direction, and the fourth edge folding part is arranged in the mode that the end, deviating from the second edge folding part, of the third edge folding part extends in the direction opposite to the second direction. And the fourth edge folding part is bent to the main body part. The electronic equipment comprises the battery cell. According to the battery cell provided by the utility model, the space of the reserved folded edge is small, the overall size of the battery cell is small, and the energy density of the battery cell is low. The electronic equipment applying the battery cell can save the space for mounting the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, and in particular to a battery cell and electronic equipment. Background Art

[0002] Foldable phones bucked the market trend in 2022, with global shipments increasing by 62% (12.9 million units). Global shipments are expected to reach 19 million units in 2023. Demand for foldable phones remains focused on high ED (volume energy density) combined with high-power charging. The mainstream cell structures are MTS (center-tab), MTT (multi-tab), and ZZS (stacked, including special-shaped). Restricted by the thickness of foldable screens, cell thickness needs to be even thinner. Cells thinner than 1.8mm, due to existing folding methods and processes, leave a large amount of space in the cell width, resulting in an ED loss of 4.5%, which urgently needs to be improved. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery cell and an electronic device, aiming to solve the technical problem that the existing battery cell folding method has a large space reserved for the folding edge, which makes the overall volume of the battery cell large and leads to low overall energy density of the battery cell.

[0004] To achieve the above objectives, the present invention provides a battery cell comprising:

[0005] Main body;

[0006] a first folding portion, the first folding portion extending from the main body along a first direction;

[0007] a second folded edge portion, the second folded edge portion extending from an end of the first folded edge portion away from the main body portion along a second direction;

[0008] a third folded edge portion, the third folded edge portion extending from one end of the second folded edge portion away from the first folded edge portion in a direction opposite to the first direction;

[0009] A fourth folding portion is provided, where the fourth folding portion extends from one end of the third folding portion away from the second folding portion in a direction opposite to the second direction, and the fourth folding portion is bent to the main body portion.

[0010] In some embodiments, a groove is provided on one side of the main body portion close to the first folding portion, and the fourth folding portion is bent into the groove.

[0011] In some embodiments, an adhesive layer is provided between the fourth folded edge portion and the groove, and the adhesive layer is used to adhere the fourth folded edge portion to the groove.

[0012] In some embodiments, along the first direction, a distance L1 between two ends of the first folded edge portion and a thickness D of the main body portion satisfy: 0.8 mm < L1 ≤ D.

[0013] In some embodiments, along the second direction, a distance L2 between two ends of the second folded edge portion satisfies: 0 mm < L2 ≤ 1.0 mm.

[0014] In some embodiments, the main body has a side wall, and the first folded edge portion is extended from the side wall along the first direction.

[0015] In some embodiments, the main body has a first side wall and a second side wall that are opposite to each other, and both the first side wall and the second side wall are provided with the first folded edge portion;

[0016] Wherein, the first folding portion is extended from the first side wall along the first direction;

[0017] Furthermore, the first folded edge portion is extended from the second side wall along the first direction.

[0018] In some embodiments, the thickness D of the main body satisfies: 1.0 mm ≤ D ≤ 2.2 mm.

[0019] In some embodiments, the first folding portion, the second folding portion, the third folding portion, and the fourth folding portion are aluminum-plastic film structures.

[0020] Correspondingly, the present invention also provides an electronic device, comprising the battery cell described in any one of the above embodiments.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In the technical solution of the present invention, a battery cell with a new folding method is provided. When packaging the battery cell, in order to achieve effective edge sealing of the battery cell and prevent the battery cell from leaking due to insufficient edge sealing, it is necessary to retain some design margin, that is, the edge sealing of the battery cell will exceed the size of the battery cell electrode, so that the electrode can be packaged. However, if the edge sealing margin is not processed, the above design will cause the overall volume of the battery cell to increase and the energy density to decrease, which is not applicable for situations where ultra-thin battery cells are required. In order to improve the effect of edge sealing on the energy density of the battery cell, the utility model folds up the excess edge sealing in the battery cell so that the edge sealing is attached to the main body of the battery cell, thereby realizing a compact structure, a lightweight and thin volume, and a wide range of applications for the battery cell.

[0023] Furthermore, before the edge seal is bent, the edge seal is initially extended horizontally. The process of bending the edge seal includes four bending stages, namely the first bending stage, the second bending stage, the third bending stage, and the fourth bending stage. In the first bending stage, the edge seal is bent downward to form a first folded edge portion in the horizontal direction. In the second bending stage, the vertical longitudinal edge seal formed in the first bending stage is bent toward the direction close to the main body of the battery cell to form a second folded edge portion in the vertical longitudinal direction. In the third bending stage, the bent edge seal formed in the second bending stage is bent as a whole toward the direction close to the main body of the battery cell, so that the bent edge seal is attached to the main body of the battery cell. In the fourth bending stage, the edge seal that extends beyond the main body in the vertical longitudinal direction formed in the third bending stage is bent toward the main body, and the edge seal that extends beyond the main body is bent into the groove, forming a third folding edge in the vertical longitudinal direction and a fourth folding edge in the horizontal direction, thereby obtaining a battery cell with a flat folding edge and a light, thin and compact size.

[0024] Furthermore, the above-mentioned edge bending method not only facilitates the edge bending operation and makes it easier to bend the edge into place, but also facilitates the control of the edge bending consistency, helps to reduce the edge bending tolerance, and improves the flatness of the edge after bending.

[0025] The battery cell structure provided by the utility model is conducive to the effective packaging of the battery cell and prevents the battery cell from leaking due to insufficient edge sealing, and is also conducive to reducing the space reserved for the folded edge, reducing the overall volume of the battery cell, and improving the overall energy density of the battery cell.

[0026] Electronic devices using these cells, due to their small size and overall thinness, are conducive to the development of electronic devices towards thinner, lighter, and smaller sizes. Alternatively, multiple such cells can be installed in an electronic device within the same volume, thereby improving the electronic device's fast charging speed and battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is an isometric view of the overall structure of a battery cell provided by one embodiment of the present invention;

[0029] Figure 2This is a schematic structural diagram of a battery cell in an initial state provided by an embodiment of the present invention;

[0030] Figure 3 This is a schematic structural diagram of a battery cell provided by an embodiment of the present invention in the first bending stage;

[0031] Figure 4 This is a schematic structural diagram of a battery cell provided by an embodiment of the present invention in the second bending stage;

[0032] Figure 5 This is a schematic structural diagram of a battery cell provided by an embodiment of the present invention in the third bending stage;

[0033] Figure 6 This is a schematic structural diagram of a battery cell provided by an embodiment of the present invention in the fourth bending stage.

[0034] Description of Figure Numbers:

[0035] 100-main body;

[0036] 110 - groove; 120 - first side wall; 130 - second side wall;

[0037] 200-first folding portion;

[0038] 300- second folding portion;

[0039] 400-third folding edge;

[0040] 500- fourth folding edge;

[0041] X-first direction;

[0042] Y-second direction.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 the present invention.

[0047] Foldable phones bucked the market trend in 2022, with global shipments increasing by 62% (12.9 million units). Global shipments are expected to reach 19 million units in 2023. Demand for foldable phones remains focused on high ED (volume energy density) combined with high-power charging. The mainstream cell structures are MTS (center-tab), MTT (multi-tab), and ZZS (stacked, including special-shaped). Restricted by the thickness of foldable screens, cell thickness needs to be even thinner. Cells thinner than 1.8mm, due to existing folding methods and processes, leave a large amount of space in the cell width, resulting in an ED loss of 4.5%, which urgently needs to be improved.

[0048] In order to solve the technical problem that the existing battery cell folding method has a large space for folding, which makes the overall volume of the battery cell large and leads to low overall energy density of the battery cell, Figure 1An embodiment of the present invention provides a battery cell, which includes a main body 100, a first folding portion 200, a second folding portion 300, a third folding portion 400, and a fourth folding portion 500. The first folding portion 200 extends from the main body 100 along a first direction X, the second folding portion 300 extends from one end of the first folding portion 200 away from the main body 100 along a second direction Y, the third folding portion 400 extends from one end of the second folding portion 300 away from the first folding portion 200 in a direction opposite to the first direction X, the fourth folding portion 500 extends from one end of the third folding portion 400 away from the second folding portion 300 in a direction opposite to the second direction Y, and the fourth folding portion 500 is bent to the main body 100. For example, the first direction X can refer to a vertical longitudinal direction, and the second direction Y can refer to a horizontal transverse direction.

[0049] Specifically, in order to solve the above problems, in this embodiment, a battery cell with a new folding method is provided. When packaging the battery cell, in order to achieve effective edge sealing of the battery cell and prevent the battery cell from leaking due to insufficient edge sealing, it is necessary to retain some design margin, that is, the edge sealing of the battery cell will exceed the size of the battery cell electrode, so that the electrode can be packaged. However, if the edge sealing margin is not processed, the above design will cause the overall volume of the battery cell to increase and the energy density to decrease, which is not applicable for situations where ultra-thin battery cells are required. In order to improve the effect of edge sealing on the energy density of the battery cell, this embodiment folds up the excess edge sealing in the battery cell so that the edge sealing is attached to the main body 100 of the battery cell, thereby realizing a compact structure, a lightweight and thin volume, and a wide range of applications for the battery cell.

[0050] Further, refer to Figures 2 to 6 Before the edge seal is bent, the edge seal is initially stretched horizontally. The process of bending the edge seal includes four bending stages, namely the first bending stage, the second bending stage, the third bending stage and the fourth bending stage. In the first bending stage, the edge seal is bent downward to form a first folded edge portion 200 in the horizontal direction. In the second bending stage, the vertical longitudinal edge seal formed in the first bending stage is bent toward the direction close to the main body 100 of the battery cell to form a second folded edge portion 300 in the vertical longitudinal direction. In the third bending stage, the bent edge seal formed in the second bending stage is bent as a whole toward the direction close to the main body 100 of the battery cell, so that the bent edge seal is attached to the main body 100 of the battery cell. In the fourth bending stage, the edge seal that extends beyond the main body 100 in the vertical longitudinal direction formed in the third bending stage is bent toward the direction close to the main body 100, and the edge seal that extends beyond the main body 100 is bent into the groove 110, forming a third folding edge 400 in the vertical longitudinal direction and a fourth folding edge 500 in the horizontal transverse direction, thereby obtaining a battery cell with a flat folding edge and a light, thin and compact size.

[0051] Furthermore, the above-mentioned edge bending method not only facilitates the edge bending operation and makes it easier to bend the edge into place, but also facilitates the control of the edge bending consistency, helps to reduce the edge bending tolerance, and improves the flatness of the edge after bending.

[0052] The battery cell structure provided in this embodiment is conducive to effective packaging of the battery cell and preventing leakage of the battery cell due to insufficient edge sealing. It is also conducive to reducing the space reserved for the folded edge, reducing the overall volume of the battery cell, and improving the overall energy density of the battery cell.

[0053] Further, refer to Figures 1 to 6 The folding edge of the battery cell provided in this embodiment starts from the bottom of the battery cell. Compared with folding the edge from the top of the battery cell, the folding method provided in this embodiment has lower requirements for the precision of the core winding into the shell, and the short electrode material is not easily folded. In other words, if the folding edge starts from the top of the battery cell, the precision of the core winding into the shell is required to be higher, and the short electrode material is easily folded.

[0054] Furthermore, the folded edge starts from the top of the battery cell, which has the following defects:

[0055] First, thinner cells have a greater EDloss (energy density loss), and the top bend needs to ensure an effective seal and extend farther into the cell body. Taking a 1.5*55*98 cell as an example (where 1.5 (mm) refers to the thickness of the cell, 55 (mm) refers to the width of the cell, and 98 (mm) refers to the length of the cell), the fold is folded from the top of the cell. The cell fold height is 1.3mm, the inner unsealed area is 0.6mm, and the back platform is 0.6mm. The effective seal is greater than 1.0mm, plus the tolerance requirement of 1.3mm for the first fold. The ED loss for the first fold (including tolerance) is: 1.6*2 / 55 / 3 = 1.93%, and the ED loss for the second fold is: 0.3 / 55 = 0.6%, for a total ED loss of 2.5%. If the folding method is used to start from the bottom of the battery cell, the ED loss of the first and second folds is: 0.7 / 55=1.2%, and the ED loss of the third fold is: 0.5*2 / 55 / 3=0.3%, and the total ED loss is 1.5%.

[0056] The second point: the consistency of the folding edge of the battery cell is difficult to control. The battery cell is too thin. The first folding edge is folded first, and there is a tolerance on the second folding edge. After the second folding edge is formed, the second folding edge of the battery cell goes out of tolerance, and the folding edge height is easy to be too high, or the second folding edge goes below the tolerance and cannot be formed. The first fold will bend upwards, and the flatness of the battery cell is affected.

[0057] The third point: Ultra-thin battery cells are thin and have sharper corners, so they need to be folded to increase their drop resistance.

[0058] In some embodiments, reference Figure 1 A groove 110 is provided on one side of the main body 100 close to the first folding portion 200, and the fourth folding portion 500 is bent into the groove 110. Exemplarily, for example, the size of the groove 110 can be adapted to the size of the fourth folding portion 500, that is, the groove length of the groove 110 can be consistent with the length of the fourth folding portion 500, the groove width of the groove 110 can be consistent with the width of the fourth folding portion 500, and the groove depth of the groove 110 can be consistent with the thickness of the fourth folding portion 500. For example, the groove width of the groove 110 can be between 0.3 mm and 1.0 mm (inclusive) to protect the folding position; the groove depth of the groove 110 can be between 0.2 mm and 0.5 mm (inclusive).

[0059] Specifically, in this embodiment, since the fourth folded edge portion 500 has a certain thickness, if the fourth folded edge portion 500 is directly attached to the surface of the main body portion 100, the overall thickness of the battery cell will be directly increased. By opening a groove 110 on the main body portion 100 and bending the fourth folded edge portion 500 into the above-mentioned groove 110, it is helpful to eliminate the influence of the thickness of the fourth folded edge portion 500 on the overall thickness of the battery cell. That is, even if the fourth folded edge portion 500 is attached to the main body portion 100, the overall thickness of the battery cell will not be increased, making the battery cell lighter and thinner.

[0060] Furthermore, in some embodiments, the groove 110 can be opened by laser cleaning + punching. Specifically, the loading area of ​​the electrode of the battery cell is cleaned by laser to make room for the fourth folding portion 500 for the attachment of the fourth folding portion 500. The aluminum-plastic film on the outside of the battery cell is punched so that the aluminum-plastic film and the electrode fit tightly. Alternatively, a special-shaped electrode can be provided on one side of the battery cell close to the first folding portion 200, so that a groove 110 that matches the size of the fourth folding portion 500 is formed on the main body 100 for the attachment of the fourth folding portion 500.

[0061] In some embodiments, an adhesive layer (not shown in the figures) is provided between the fourth folding portion 500 and the groove 110 , and the adhesive layer is used to adhere the fourth folding portion 500 to the groove 110 .

[0062] Specifically, in this embodiment, by providing an adhesive layer between the fourth folded edge portion 500 and the groove 110, the fixing stability of the fourth folded edge portion 500 in the groove 110 can be improved, and the fourth folded edge portion 500 can be effectively prevented from warping, thereby ensuring that the battery cell can be effectively sealed and preventing leakage of the battery cell due to poor sealing.

[0063] Furthermore, in some embodiments, the adhesive layer may be provided by encapsulating the adhesive, or the adhesive layer may be provided by dripping the adhesive.

[0064] In some embodiments, reference Figure 6 Along the first direction X, the distance L1 between the two ends of the first folded edge portion 200 and the thickness D of the main body portion 100 satisfy the following relationship: 0.8 mm < L1 ≤ D. For example, assuming that the thickness D of the main body portion 100 is 2 mm, the value of L1 satisfies the following relationship: 0.8 mm < L1 ≤ 2 mm. Specifically, the value of L1 can be 1 mm, 1.5 mm, 1.8 mm, 1.9 mm, 2 mm, and so on.

[0065] Specifically, in this embodiment, the value of L1 is set within the above range so that the height of the edge folding is not higher than the thickness of the battery cell. If the height of the edge folding is higher than the thickness of the battery cell, the overall thickness of the battery cell will increase, thereby reducing the energy density of the battery cell.

[0066] In some embodiments, reference Figure 6 Along the second direction Y, the distance L2 between the two ends of the second folded edge portion 300 satisfies: 0 mm < L2 ≤ 1.0 mm. For example, the value of L2 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, etc.

[0067] Specifically, in this embodiment, the value of L2 is set within the above range so that the width of the edge fold is within a suitable range. If the width of the edge fold is larger, the overall width of the battery cell will increase, thereby reducing the energy density of the battery cell.

[0068] In some embodiments, the main body 100 has a side wall, and the first folding portion 200 is extended along the first direction X from the side wall.

[0069] Specifically, in this embodiment, by setting the edge seal on one side of the main body 100, it is convenient to bend the edge seal to form the first folding portion 200, the second folding portion 300, the third folding portion 400 and the fourth folding portion 500, thereby reducing the difficulty of edge seal processing and improving the efficiency of battery cell processing. In addition, after the edge seal is bent, it will be attached to the side wall of the main body 100, rather than attached to the top wall or bottom wall of the main body 100, which is conducive to reducing the impact of the bent edge seal on the overall thickness of the battery cell (the battery cell provided in this embodiment is an ultra-thin battery cell, so compared with the situation where the length and width of the battery cell are increased by attaching the bent edge seal to the side wall of the main body 100, the situation where the thickness of the battery cell is increased by attaching the bent edge seal to the top wall or bottom wall of the main body 100 has a greater impact on the energy density of the battery cell), which is conducive to making the battery cell lighter and thinner.

[0070] In some embodiments, reference Figure 1The main body 100 has a first side wall 120 and a second side wall 130 that are opposite to each other. The first side wall 120 and the second side wall 130 are both provided with a first folded portion 200. The first folded portion 200 is extended from the first side wall 120 along the first direction X; and the first folded portion 200 is extended from the second side wall 130 along the first direction X.

[0071] Specifically, in this embodiment, edge sealing margins can be provided on both side walls of the main body 100 that are opposite to each other. This ensures that the battery cell has sufficient edge sealing margins (for example, the effective edge sealing width of the battery cell is above 1.0 mm), while effectively preventing the edge sealing from piling up on one side of the main body 100, resulting in a situation where the thickness of a single-sided edge sealing is too thick after bending, which is not conducive to improving the energy density of the battery cell.

[0072] In some embodiments, the thickness D of the main body 100 satisfies the following: 1.0 mm ≤ D ≤ 2.2 mm. For example, D can be 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, and so on. Therefore, the battery cell is an ultra-thin cell, which can effectively reduce the installation space of the battery cell.

[0073] In some embodiments, the first folded edge portion 200, the second folded edge portion 300, the third folded edge portion 400, and the fourth folded edge portion 500 are aluminum-plastic film structures. During the actual processing of the battery cell, the electrode pieces need to be encapsulated with aluminum-plastic film to form the battery cell. Therefore, the edge sealing in the above embodiment is aluminum-plastic film.

[0074] In some embodiments, taking a battery cell with a model of 2.3*55*98 as an example (where 2.3 (mm) refers to the thickness of the battery cell, 55 (mm) refers to the width of the battery cell, and 98 (mm) refers to the length of the battery cell), ED loss calculation is performed (where ED refers to the energy density of the battery cell). After testing, the ED loss of a conventional battery cell without edge sealing and folding and having a double-sided width of 1.25mm is 4.5%, and the calculation process is: 1.25*2 / 55=4.5%. The ED loss of the battery cell with edge sealing and folding provided in this embodiment and a double-sided width of 0.5mm after edge sealing and folding is 1.81%, and the calculation process is: 0.5*2 / 55=1.81%.

[0075] Correspondingly, another embodiment of the present invention further provides an electronic device, which includes the battery cell of any of the above embodiments. For example, the electronic device can be a foldable mobile phone, a computer, a digital camera, etc.

[0076] Specifically, in this embodiment, the electronic device using the above-mentioned battery cell is smaller and thinner overall, thus facilitating the development of electronic devices towards thinner, lighter, and smaller sizes. Alternatively, multiple such battery cells can be installed in an electronic device within the same volume, thereby improving the fast charging speed and battery life of the electronic device.

[0077] Thanks to the improvement of the above-mentioned battery cell, the electronic device of this embodiment has the same technical effects as the above-mentioned battery cell, which will not be described in detail here.

[0078] It should be noted that other contents of the battery cell and electronic device disclosed in the present invention can be found in the prior art and will not be described in detail here.

[0079] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: Main body; a first folding portion, the first folding portion extending from the main body along a first direction; a second folded edge portion, the second folded edge portion extending from an end of the first folded edge portion away from the main body portion along a second direction; a third folded edge portion, the third folded edge portion extending from one end of the second folded edge portion away from the first folded edge portion in a direction opposite to the first direction; A fourth folding portion is provided, where the fourth folding portion extends from one end of the third folding portion away from the second folding portion in a direction opposite to the second direction, and the fourth folding portion is bent to the main body portion.

2. The battery cell according to claim 1, characterized in that A groove is provided on one side of the main body portion close to the first folding portion, and the fourth folding portion is bent into the groove.

3. The battery cell according to claim 2, characterized in that An adhesive layer is provided between the fourth folded edge portion and the groove, and the adhesive layer is used to adhere the fourth folded edge portion to the groove.

4. The battery cell according to claim 1, characterized in that Along the first direction, a distance L1 between two ends of the first folded edge portion and a thickness D of the main body portion satisfy the following relationship: 0.8 mm < L1 ≤ D.

5. The battery cell according to claim 1, characterized in that Along the second direction, a distance L2 between two ends of the second folded edge portion satisfies: 0 mm < L2 ≤ 1.0 mm.

6. The battery cell according to claim 1, characterized in that The main body has a side wall, and the first folded edge portion is extended from the side wall along the first direction.

7. The battery cell according to claim 1, characterized in that The main body has a first side wall and a second side wall that are opposite to each other, and both the first side wall and the second side wall are provided with the first folded edge portion; Wherein, the first folding portion is extended from the first side wall along the first direction; Furthermore, the first folded edge portion is extended from the second side wall along the first direction.

8. The battery cell according to claim 1, characterized in that The thickness D of the main body satisfies: 1.0 mm ≤ D ≤ 2.2 mm.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The first folding portion, the second folding portion, the third folding portion and the fourth folding portion are aluminum-plastic film structures.

10. An electronic device, characterized in that A battery cell comprising the battery cell according to any one of claims 1 to 9.

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