Battery cell and battery pack with same

Abstract

The utility model discloses a single battery and a battery pack with the single battery, and the single battery comprises a shell, at least one of two opposite ends of the shell is provided with an opening; the top cover covers the opening of the shell; the insulating film comprises a body part and a turnover part, the body part wraps the outer wall surface of the shell, one end of the turnover part is connected with the body part, the other end of the turnover part extends towards the center of the top cover, the turnover part wraps at least part of the surface of the top cover, the turnover part is provided with a first turned-over edge and a second turned-over edge, and the first turned-over edge and the second turned-over edge are provided with an overlapping area; a notch is formed in the position, opposite to the overlapping area, of the top cover patch, and the overlapping area is located on the outer side of the top cover patch according to the projection of the notch on the plane perpendicular to the thickness direction of the top cover patch. According to the battery monomer disclosed by the utility model, the influence of the overlapping area on the top cover patch can be reduced, the top cover patch is prevented from being upwarped along with the overlapping area, the risk of short circuit of the battery monomer is reduced, and the reliability and the safety are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer and a battery pack having the same. Background Art

[0002] In the actual production of lithium-ion batteries, due to the coating tolerance of the blue film of the insulating component, a part of the blue film will be left on the top of the shell, and this part of the surplus will usually be folded at the corners of the shell. After the blue film is folded, the corners are prone to warp up, and the upturned corners are prone to warp up with the top cover patch. The upturned top cover patch not only has the risk of battery short circuit, but also affects the bonding of the flexible circuit board of the battery module, thereby causing the battery module to fail. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell, which can reduce the influence of the top cover patch on the overlap area, avoid the top cover patch from warping up along with the overlap area, reduce the risk of short circuit of the battery cell, and ensure the reliability and safety of the battery cell.

[0004] The utility model also provides a battery pack, which includes the above-mentioned battery monomer.

[0005] According to an embodiment of the utility model, a battery cell includes: a shell, at least one of the two opposite ends of the shell has an open mouth; a top cover, the top cover is covered on the open mouth of the shell; an insulating film, the insulating film includes a main body and a folding portion, the main body covers the outer wall surface of the shell, one end of the folding portion is connected to the main body, and the other end extends toward the center of the top cover, the folding portion covers at least a portion of the surface of the top cover, the folding portion has a first flange and a second flange, one of the first flange and the second flange extends along the length direction of the top cover, and the other extends along the width direction of the top cover, and the first flange and the second flange have an overlapping area; a top cover patch, the top cover patch is pasted on a side of the top cover away from the shell, the folding portion is arranged between the top cover patch and the top cover, a notch is provided at a position of the top cover patch opposite to the overlapping area, and the overlapping area is located outside the top cover patch in terms of projection on a plane perpendicular to the thickness direction of the top cover patch.

[0006] According to the battery cell of the embodiment of the utility model, the folding portion of the insulating film has a first flange and a second flange, the first flange and the second flange have an overlapping area, the top cover patch is adhered to the side of the top cover away from the shell, the folding portion is arranged between the top cover patch and the top cover, and a notch is provided at a position of the top cover patch opposite to the overlapping area. In the projection on a plane perpendicular to the thickness direction of the top cover patch, the overlapping area is located outside the top cover patch. The setting of the notch can avoid the overlapping area of ​​the insulating film, avoid the top cover patch from being bonded to the overlapping area, reduce the influence of the overlapping area on the top cover patch, improve the fitting effect of the top cover patch, and avoid the top cover patch from curling up with the overlapping area, thereby reducing the risk of short circuit in the battery cell and ensuring the reliability and safety of the battery cell.

[0007] In addition, the battery cell according to the utility model may also have the following additional technical features:

[0008] In some embodiments, along the circumferential direction of the main body, there are two first flanges and two second flanges, the two first flanges are respectively arranged on both sides of the width direction of the top cover, and the two second flanges are respectively arranged on both sides of the length direction of the top cover, and both ends of the length direction of each first flange have the overlapping area with the second flange, and the notch corresponds to the overlapping area one by one.

[0009] In some embodiments, the length of the folded portion folded toward the top cover is a, and satisfies: 2mm≤a≤5mm.

[0010] In some embodiments, the minimum distance between the inner contour of the notch and the overlapping area is b, and satisfies: 0.5 mm ≤ b ≤ 2 mm.

[0011] In some embodiments, along the length direction of the top cover, the distance between the outer edge of the top cover patch excluding the notch and the outer edge of the top cover is c1, and satisfies: c1≤0.5mm; and / or, along the width direction of the top cover, the distance between the outer edge of the top cover patch excluding the notch and the outer edge of the top cover is c2, and satisfies: c2≤0.5mm.

[0012] In some embodiments, the top cover is provided with a pole, and the top cover patch has a first avoidance hole opposite to the pole; and / or, an explosion-proof valve is provided on the top cover, and the top cover patch has a second avoidance hole to avoid the explosion-proof valve; and / or, an injection hole is provided on the top cover, and the top cover patch has a third avoidance hole to avoid the injection hole.

[0013] In some embodiments, the top cover patch is an insulator.

[0014] In some embodiments, both opposite ends of the shell are open, there are two top covers, and there are two top cover patches corresponding to the two top covers one by one.

[0015] In some embodiments, the length of the battery cell is 300 mm-1000 mm, the width of the battery cell is 50 mm-150 mm, and the thickness of the battery cell is 12 mm-25 mm.

[0016] The utility model also provides a battery pack having the above embodiment.

[0017] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cell, the folding portion of the insulating film has a first flange and a second flange, the first flange and the second flange have an overlapping area, the top cover patch is adhered to the side of the top cover away from the shell, the folding portion is arranged between the top cover patch and the top cover, and a notch is provided at a position of the top cover patch opposite to the overlapping area. In the projection on a plane perpendicular to the thickness direction of the top cover patch, the overlapping area is located outside the top cover patch. The setting of the notch can avoid the overlapping area of ​​the insulating film, avoid the top cover patch from being bonded to the overlapping area, reduce the influence of the overlapping area on the top cover patch, improve the fitting effect of the top cover patch, and avoid the top cover patch from curling up with the overlapping area, thereby reducing the risk of short circuit of the battery cell and ensuring the reliability and safety of the battery cell.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a three-dimensional diagram of a battery cell according to an embodiment of the utility model;

[0021] Figure 2 is an exploded view of a battery cell according to an embodiment of the utility model;

[0022] Figure 3 It is a front view of a top cover patch of a battery cell according to an embodiment of the utility model;

[0023] Figure 4 This is a front view of the insulating film and the top cover of the battery cell according to the embodiment of the utility model;

[0024] Figure 5 is a front view of a battery cell according to an embodiment of the utility model;

[0025] Figure 6 yes Figure 5 Enlarged view of point D in the middle.

[0026] Reference numerals:

[0027] 100. Battery cell;

[0028] 1. Shell; 11. Open mouth; 12. Electrode group;

[0029] 2. Top cover; 21. Pole;

[0030] 3. Insulating film; 31. Main body; 32. Folding portion; 321. First flange; 322. Second flange; 323. Overlapping area;

[0031] 4. Top cover patch; 41. Notch; 42. First avoidance hole. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] A battery cell 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0037] like Figure 2 As shown, the battery cell 100 according to the embodiment of the present invention includes: a housing 1 , a top cover 2 , an insulating film 3 and a top cover patch 4 .

[0038] Specifically, refer to the attached Figure 2 As shown, the shell 1 has a cavity for placing the electrode group 12, and at least one of the two opposite ends of the shell 1 has an open mouth 11. The top cover 2 is covered on the open mouth 11 of the shell 1 and is welded to the shell 1 to seal the open mouth 11 of the shell 1, so that the internal and external environments of the battery cell 100 are isolated, thereby playing a sealing role.

[0039] Further, in conjunction with the reference Figure 2 and attached Figure 4 The insulating film 3 includes a main body portion 31 and a folded portion 32. The main body portion 31 covers the outer wall of the shell 1. On the one hand, it can play an insulating role to prevent the shell 1 from being short-circuited with the external circuit of the battery cell 100. On the other hand, it can play a protective role to prevent the outer wall of the shell 1 from being worn or scratched. In addition, it can also protect the welding area between the top cover 2 and the shell 1 to prevent connection failure.

[0040] Further, see Appendix Figure 4 As shown, one end of the folded portion 32 is connected to the main body 31, and the other end extends toward the center of the top cover 2. The folded portion 32 covers at least a portion of the surface of the top cover 2 and extends along the circumferential direction of the main body 31, which can improve the insulation effect and protection effect of the insulation film 3. Figure 4 As shown, the folding portion 32 has a first flange 321 and a second flange 322, one of the first flange 321 and the second flange 322 is along the length direction of the top cover 2 (see the attached Figure 4 The other extends in the width direction of the top cover 2 (see the attached Figure 4 The first flange 321 and the second flange 322 extend in the f direction as shown, and have an overlapping area 323.

[0041] Further, see Attachment Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the top cover patch 4 is a sheet structure and is pasted on the side of the top cover 2 away from the shell 1. The folded portion 32 is provided between the top cover patch 4 and the top cover 2. The provision of the top cover patch 4 can insulate and protect the top cover 2, preventing the top cover 2 from being worn or scratched. The top cover patch 4 and the insulating film 3 can cooperate to completely wrap the shell 1 and the top cover 2, thereby improving the reliability and safety of the battery cell 100 and extending the service life of the battery cell 100. It should be noted that the top cover 2 is rectangular, and the top cover patch 4 is a rectangle with the same shape as the top cover 2.

[0042] Further, see Appendix Figure 3 and attached Figure 5 As shown, the top cover patch 4 is provided with a notch 41 at a position opposite to the overlapping area 323, perpendicular to the thickness direction of the top cover patch 4 (see attached Figure 2 The projection on the plane (g direction shown), the overlapping area 323 is located outside the top cover patch 4, and the inner contour of the notch 41 is located on the side of the overlapping area 323 close to the center of the top cover 2. The setting of the notch 41 can avoid the overlapping area 323 of the insulating film 3, avoid the top cover patch 4 and the overlapping area 323 from being bonded, reduce the influence of the overlapping area 323 on the top cover patch 4, improve the bonding effect of the top cover patch 4, and avoid the top cover patch 4 from curling up along with the overlapping area 323, thereby reducing the risk of short circuit of the battery cell 100 and ensuring the reliability and safety of the battery cell 100. Optionally, the notch 41 may be provided at one of the four corners of the top cover patch 4, or at two of the four corners of the top cover patch 4, or at three of the four corners of the top cover patch 4, or at four of the four corners of the top cover patch 4.

[0043] Optionally, the inner contour of the notch 41 may be as follows: Figure 3 The square notch shown may also be an arc-shaped notch, and the present invention does not impose too many restrictions.

[0044] According to the battery cell 100 of the embodiment of the utility model, the folding portion 32 of the insulating film 3 has a first flange 321 and a second flange 322, the first flange 321 and the second flange 322 have an overlapping area 323, the top cover patch 4 is pasted to the side of the top cover 2 away from the shell 1, the folding portion 32 is arranged between the top cover patch 4 and the top cover 2, and a notch 41 is provided at a position opposite to the overlapping area 323 of the top cover patch 4. In the projection on a plane perpendicular to the thickness direction of the top cover patch 4, the overlapping area 323 is located on the outside of the top cover patch 4. The setting of the notch 41 can avoid the overlapping area 323 of the insulating film 3, avoid the top cover patch 4 from being bonded to the overlapping area 323, reduce the influence of the overlapping area 323 on the top cover patch 4, improve the fitting effect of the top cover patch 4, and avoid the top cover patch 4 from curling up along with the overlapping area 323, thereby reducing the risk of short circuit of the battery cell 100 and ensuring the reliability and safety of the battery cell 100.

[0045] In some embodiments of the present invention, refer to the attached Figure 4 As shown, along the circumferential direction of the main body 31, there are two first flanges 321 and two second flanges 322, the two first flanges 321 are respectively arranged on both sides of the width direction of the top cover 2, and the two second flanges 322 are respectively arranged on both sides of the length direction of the top cover 2, the two first flanges 321 and the two second flanges 322 together constitute the folding portion 32, and the length direction of each first flange 321 (refer to the attached Figure 4 Both ends of the top cover 2 (in the direction e shown) have overlapping areas 323 with the second flange 322, and the notches 41 correspond one-to-one to the overlapping areas 323. It can be understood that there are four overlapping areas 323 arranged at each corner of the top cover 2, and the notches 41 correspond one-to-one to the four overlapping areas 323. The four corners of the top cover patch 4 are provided with notches 41 to avoid the overlapping areas 323, further avoiding the top cover patch 4 from being adhered to the overlapping areas 323, reducing the influence of the overlapping areas 323 on the top cover patch 4, improving the fitting effect of the top cover patch 4, and avoiding the top cover patch 4 from curling up with the overlapping areas 323, thereby reducing the risk of short circuit of the battery cell 100 and ensuring the reliability and safety of the battery cell 100.

[0046] In some embodiments of the present invention, refer to the attached Figure 4As shown, the length of the folded portion 32 folded toward the top cover 2 is a, and satisfies: 2mm≤a≤5mm, and the lengths of the first flange 321 and the second flange 322 folded toward the top cover 2 are both greater than or equal to 2mm and less than or equal to 5mm. It can be understood that if the length a of the folded portion 32 toward the top cover 2 is less than 2mm, the bonding strength between the insulating film 3 and the top cover 2 is insufficient, which may easily cause the insulating film 3 to warp, further increasing the probability of the overlapping area 323 of the folded portion 32 to warp, and the probability of the top cover patch 4 to warp, increasing the risk of short circuit of the battery cell 100; if the length of the folded portion 32 toward the top cover 2 is greater than 5mm, the area of ​​the insulating film 3 and the top cover 2 is increased, and the production cost of the battery cell 100 is also increased. For example, the length a of the folded portion 32 toward the top cover 2 may be 2mm, 2.5mm, 3mm, 4mm or 5mm. In a specific example, refer to the attached Figure 4 As shown, the length a of the folded portion 32 folded toward the top cover 2 is 2 mm.

[0047] In some embodiments of the present invention, refer to the attached Figure 6 As shown in the attached reference Figure 5 , the minimum distance between the inner contour of the notch 41 and the overlapping area 323 is b, and satisfies: 0.5mm≤b≤2mm, so as to ensure that the top cover patch 4 avoids the overlapping area 323 of the insulating film 3, reduce the influence of the overlapping area 323 on the top cover patch 4, avoid the top cover patch 4 from curling up with the overlapping area 323, reduce the short circuit risk of the battery cell 100, improve the safety and reliability of the battery cell 100, and avoid the insulation protection of the insulating film 3 and the top cover patch 4 for the top cover 2 due to the excessive gap between the inner contour of the notch 41 and the overlapping area 323. For example, the minimum distance b between the inner contour of the notch 41 and the overlapping area 323 can be 0.5mm, 0.8mm, 1mm, 1.1mm, 1.5mm, 1.7mm or 2mm.

[0048] In some embodiments of the present invention, refer to the attached Figure 6 As shown in the attached reference Figure 5, along the length direction of the top cover 2, the distance between the outer edge of the top cover patch 4 except the notch 41 and the outer edge of the top cover 2 is c1, and satisfies: c1≤0.5mm, along the width direction of the top cover 2, the distance between the outer edge of the top cover patch 4 except the notch 41 and the outer edge of the top cover 2 is c2, and satisfies: c2≤0.5mm. It can be understood that the top cover patch 4 is a rectangle with roughly the same shape as the top cover 2. Due to the tolerance, the size of the top cover patch 4 is slightly smaller than the size of the top cover 2. The distance between the outer edge of the top cover patch 4 except the notch 41 and the outer edge of the top cover 2 is less than or equal to 0.5mm, which can avoid affecting the insulation protection effect of the top cover patch 4 on the top cover 2 due to the excessive distance between the outer edge of the top cover patch 4 and the outer edge of the top cover 2.

[0049] In some embodiments of the present invention, Figure 2 and attached Figure 5 The top cover 2 is provided with a pole 21, and the current inside the battery cell 100 can be transmitted to the outside through the pole 21, which plays a guiding role. The top cover patch 4 has a first avoidance hole 42 opposite to the pole 21. The setting of the first avoidance hole 42 can avoid the pole 21 to ensure the normal transmission of current.

[0050] Furthermore, an explosion-proof valve is provided on the top cover 2, and a second avoidance hole for avoiding the explosion-proof valve is provided on the top cover patch 4. The setting of the explosion-proof valve can arrange the high-temperature and high-pressure gas inside the battery cell 100, and prevent the battery cell 100 from catching fire and causing serious safety accidents, thereby improving the safety performance of the battery cell 100. Optionally, the top cover 2 is a plain aluminum sheet, and the explosion-proof valve is welded to the top cover 2 by laser.

[0051] Furthermore, a liquid injection hole is provided on the top cover 2 , and a third avoidance hole for avoiding the liquid injection hole is provided on the top cover patch 4 , and electrolyte can be injected into the interior of the battery cell 100 through the liquid injection hole.

[0052] Optionally, refer to the attached Figure 3 and attached Figure 5 As shown, the top cover patch 4 is provided with markings of the positive and negative poles of the battery cell 100 , which facilitates the identification of the positive and negative poles of the battery cell 100 and reduces the difficulty of assembling the battery cell 100 .

[0053] In some embodiments of the present invention, refer to the attached Figure 3 As shown, the top cover patch 4 is an insulating member, which can play an insulating role, ensure the insulation effect of the top cover 2, and prevent the top cover 2 from being short-circuited with the external circuit of the battery cell 100.

[0054] In some embodiments of the present invention, refer to the attached Figure 2As shown, both opposite ends of the shell 1 are open, there are two top covers 2, the positive pole and the secondary pole are respectively penetrated on the two top covers 2, there are two top cover patches 4 corresponding to the two top covers 2 one by one, so as to cooperate with the insulating film 3 to achieve complete wrapping of the shell 1 and the top cover 2, thereby improving the reliability and safety of the battery cell 100 and extending the service life of the battery cell 100.

[0055] In some embodiments of the present invention, refer to the attached Figure 1 and attached Figure 2 As shown, the length of the battery cell 100 is 300mm-1000mm, the width of the battery cell 100 is 50mm-150mm, and the thickness of the battery cell 100 is 12mm-25mm, which can facilitate the arrangement of the battery cell 100, and can realize the de-modularization of the battery cell 100, so that the arrangement of the battery cell 100 is more compact and more concise. For example, the length of the battery cell 100 can be 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm or 1000mm, the width of the battery cell 100 can be 50mm, 70mm, 80mm, 100mm, 120mm, 140mm or 150mm, and the thickness of the battery cell 100 can be 12mm, 15mm, 17mm, 19mm, 22mm, 24mm or 25mm. In a specific example, the length of the battery cell 100 is 500 mm, the width of the battery cell 100 is 120 mm, and the thickness of the battery cell 100 is 16 mm.

[0056] The present invention also provides a battery pack having the battery cell 100 of the above embodiment.

[0057] According to the battery pack of the embodiment of the utility model, the battery cell 100 mentioned above is provided, the folding portion 32 of the insulating film 3 has a first flange 321 and a second flange 322, the first flange 321 and the second flange 322 have an overlapping area 323, the top cover patch 4 is pasted to the side of the top cover 2 away from the shell 1, the folding portion 32 is arranged between the top cover patch 4 and the top cover 2, and a notch 41 is provided at a position opposite to the overlapping area 323 of the top cover patch 4. In the projection on a plane perpendicular to the thickness direction of the top cover patch 4, the overlapping area 323 is located on the outside of the top cover patch 4. The setting of the notch 41 can avoid the overlapping area 323 of the insulating film 3, avoid the top cover patch 4 from being bonded to the overlapping area 323, reduce the influence of the overlapping area 323 on the top cover patch 4, improve the fitting effect of the top cover patch 4, and avoid the top cover patch 4 from curling up along with the overlapping area 323, thereby reducing the risk of short circuit of the battery cell 100 and ensuring the reliability and safety of the battery cell 100.

[0058] Other structures and operations of the battery cell 100 and the battery pack according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A shell, wherein at least one of the two opposite ends of the shell has an open opening; A top cover, the top cover is arranged on the open opening of the shell; An insulating film, the insulating film comprising a main body and a folded portion, the main body covering the outer wall surface of the shell, one end of the folded portion being connected to the main body, and the other end extending toward the center of the top cover, the folded portion covering at least a portion of the surface of the top cover, the folded portion having a first flange and a second flange, one of the first flange and the second flange extending along the length direction of the top cover, and the other extending along the width direction of the top cover, the first flange and the second flange having an overlapping area; A top cover patch, wherein the top cover patch is adhered to the side of the top cover facing away from the shell, the folding portion is arranged between the top cover patch and the top cover, a notch is arranged at a position of the top cover patch opposite to the overlapping area, and in a projection on a plane perpendicular to the thickness direction of the top cover patch, the overlapping area is located on the outside of the top cover patch.

2. The battery cell according to claim 1, characterized in that: Along the circumferential direction of the main body, there are two first flanges and two second flanges, the two first flanges are respectively arranged on both sides of the width direction of the top cover, and the two second flanges are respectively arranged on both sides of the length direction of the top cover, and both ends of the length direction of each first flange have the overlapping area with the second flange, and the notch corresponds to the overlapping area one by one.

3. The battery cell according to claim 1, characterized in that: The length of the folded portion folded toward the top cover is a, and satisfies: 2mm≤a≤5mm.

4. The battery cell according to claim 1, characterized in that: The minimum distance between the inner contour of the notch and the overlapping area is b, and satisfies: 0.5 mm ≤ b ≤ 2 mm.

5. The battery cell according to claim 1, characterized in that: Along the length direction of the top cover, the distance between the outer edge of the top cover patch except the notch and the outer edge of the top cover is c1, and satisfies: c1≤0.5mm; And / or, along the width direction of the top cover, the distance between the outer edge of the top cover patch except the notch and the outer edge of the top cover is c2, and satisfies: c2≤0.5mm.

6. The battery cell according to claim 1, characterized in that: The top cover is provided with a pole, and the top cover patch is provided with a first avoidance hole opposite to the pole; And / or, the top cover is provided with an explosion-proof valve, and the top cover patch is provided with a second avoidance hole for avoiding the explosion-proof valve; And / or, the top cover is provided with a liquid injection hole, and the top cover patch is provided with a third avoidance hole for avoiding the liquid injection hole.

7. The battery cell according to claim 1, characterized in that: The top cover patch is an insulating member.

8. The battery cell according to claim 1, characterized in that: The two opposite ends of the shell are open, there are two top covers, and there are two top cover patches corresponding to the two top covers one by one.

9. The battery cell according to claim 1, characterized in that: The length of the battery cell is 300 mm-1000 mm, the width of the battery cell is 50 mm-150 mm, and the thickness of the battery cell is 12 mm-25 mm.

10. A battery pack, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 9.

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