Battery cell and battery

Abstract

The utility model relates to a battery cell and a battery, and relates to the technical field of batteries, the battery cell comprises a battery cell body, a top cover assembly and an insulating film, the battery cell body comprises a top wall, a peripheral wall and a bottom wall, and two opposite ends of the peripheral wall are respectively connected with the top wall and the bottom wall; the top cover assembly comprises a top cover body and an insulating layer, the insulating layer is connected with the top cover body, and the insulating layer is arranged between the top wall and the surface, facing the cell body, of the top cover body; the insulating film and the insulating layer are integrally formed, and the insulating film is used for wrapping the peripheral wall and the bottom wall after being folded. The battery cell and the battery can reduce the loss of the insulating film, improve the production efficiency of the battery cell and improve the safety of the battery cell.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a battery cell and a battery. Background Art

[0002] The insulating film on the outer wall of the battery cell plays a crucial role in the battery cell. The insulating film can protect the battery cell, prevent short circuits, prevent fires, etc. In related technologies, the insulating film covers the entire outer wall of the battery cell. On the one hand, the consumption of the insulating film is relatively large, and the top of the existing insulating film needs to be connected to the battery top cover through an additional hot melting process, which affects the production efficiency. On the other hand, when welding the connecting tab, in order to avoid the insulating film affecting the welding quality, the insulating film on the top wall of the battery cell is usually perforated to avoid the connecting tab welding with the pole column. If the positioning of the insulating film is offset during this process, there is a risk that part of the insulating film will be melted through during the welding of the connecting tab and the pole column, resulting in a virtual weld. Summary of the Utility Model

[0003] In order to solve the above technical problems, the embodiments of this application provide a battery cell and a battery, which can reduce the loss of the insulating film, improve the production efficiency of the battery cell, and enhance the safety of the battery cell.

[0004] In a first aspect, a battery cell is provided, including:

[0005] A battery cell body, including a top wall, a peripheral wall, and a bottom wall, with opposite ends of the peripheral wall respectively connected to the top wall and the bottom wall;

[0006] A top cover assembly, including a top cover body and an insulating layer, the insulating layer is connected to the top cover body, and the insulating layer is disposed between the top wall and the surface of the top cover body facing the battery cell body;

[0007] An insulating film, integrally formed with the insulating layer, and the insulating film is used to cover the peripheral wall and the bottom wall after being folded.

[0008] According to the first aspect of this application, the insulating layer includes a first side wall and a second side wall connected to each other, the length of the first side wall is less than the length of the second side wall, and the first side wall is integrally formed with the insulating film.

[0009] According to the first aspect of this application, the top cover assembly further includes:

[0010] An extension body, connected to the second side wall, and the extension body is used to rotate or bend relative to the second side wall to abut against the insulating film already covered on the peripheral wall.

[0011] According to the first aspect of this application, a connecting member is provided on the surface of the insulating layer away from the top cover body, the connecting member is provided with a first mating hole, and the extension body is provided with a second mating hole;

[0012] The battery cell further includes:

[0013] A plug, which is fitted to the first fitting hole and the second fitting hole to relatively lock the extended body and the insulating layer after rotation or bending.

[0014] According to the first aspect of the present application, the plug includes a first plug, a connecting body, and a second plug. The first plug and the second plug are respectively detachably inserted into opposite ends of the connecting body, and at least part of the connecting body is assembled in the first fitting hole;

[0015] The outer diameter of the end of the first plug away from the connecting body and the outer diameter of the end of the second plug away from the connecting body are respectively greater than the outer diameters of opposite ends of the connecting body, and the outer diameters of the ends of the first plug and the second plug away from the connecting body are both greater than the inner diameter of the second fitting hole. Along the thickness direction of the battery cell body, the ends of the first plug and the second plug away from the connecting body abut against the outside of the second fitting hole.

[0016] According to the first aspect of the present application, the connecting body includes a first connecting end, an elastic body, and a second connecting end. Opposite ends of the elastic body are respectively connected to the first connecting end and the second connecting end;

[0017] The first connecting end is detachably connected to the first plug, and / or the second connecting end is detachably connected to the second plug.

[0018] According to the first aspect of the present application, the insulating film includes a first insulating part and a second insulating part. In the unfolded state of the insulating film, at least part of the first insulating part is connected to the insulating layer, at least another part of the first insulating part is connected to the second insulating part. The first insulating part is used to cover a part of the bottom wall and the peripheral wall, and the second insulating part is used to cover another part of the peripheral wall;

[0019] Wherein, in the unfolded state, the thickness of a single layer of the first insulating part is greater than the thickness of a single layer of the second insulating part; in the state where the first insulating part and the second insulating part cover the battery cell body, the thickness of a single layer of the first insulating part is equal to the thickness of a double layer of the second insulating part.

[0020] According to the first aspect of the present application, the thickness of a single layer of the first insulating part is A, and A satisfies: 0.08 mm ≤ A ≤ 0.12 mm;

[0021] The thickness of a single layer of the second insulating part is B, and B satisfies: 0.04 mm ≤ B ≤ 0.06 mm.

[0022] According to the first aspect of the present application, a tape is attached to the junction between different parts of the first insulating part; and / or,

[0023] a tape is attached to the junction between different parts of the second insulating part; and / or,

[0024] a tape is attached to the junction between the first insulating part and the second insulating part.

[0025] In a second aspect, a battery is further provided, comprising:

[0026] a housing;

[0027] a plurality of battery cells as described in the previous embodiments, and the plurality of battery cells are arranged in the housing.

[0028] For the battery cell and the battery provided in the embodiments of the present application, the battery cell includes a battery cell body, a top cover assembly and an insulating film. The battery cell body includes a top wall, a peripheral wall and a bottom wall, and opposite ends of the peripheral wall are respectively connected to the top wall and the bottom wall; the top cover assembly includes a top cover body and an insulating layer, the insulating layer is connected to the top cover body, and the insulating layer is arranged between the top wall and the surface of the top cover body facing the battery cell body; the insulating film is integrally formed with the insulating layer, and the insulating film is used to wrap the peripheral wall and the bottom wall after being folded. Due to the reason of arranging the insulating layer on the top cover body, the insulating film does not need to cover the top wall of the battery cell body anymore, reducing the consumption of the insulating film, and no longer requires an additional hot melting process to connect the insulating film to the top cover body, which can effectively improve the production efficiency. At the same time, when welding the connecting piece, there is no insulating film covering the top wall of the battery cell body, so there is no situation where the insulating film affects the welding quality of the connecting piece, and there is no risk of virtual soldering caused by partial melting of the insulating film when the connecting piece and the pole are welded due to the positioning deviation of the insulating film during punching in the related art, effectively improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0030] Figure 1 It is a schematic structural diagram of a battery cell provided for an exemplary embodiment of the present application.

[0031] Figure 2 It is a schematic structural diagram of a battery cell body provided for an exemplary embodiment of the present application.

[0032] Figure 3Schematic structural diagram of the insulating film before folding and the top cover assembly from a first perspective provided by an exemplary embodiment of the present application.

[0033] Figure 4 Schematic structural diagram of the insulating film before folding and the top cover assembly from a second perspective provided by an exemplary embodiment of the present application.

[0034] Figure 5 Schematic structural diagram of the top cover assembly provided by an exemplary embodiment of the present application.

[0035] Figure 6 Schematic structural diagram of the extension body provided by an exemplary embodiment of the present application.

[0036] Figure 7 Schematic structural diagram of the plug provided by an exemplary embodiment of the present application.

[0037] Figure 8 Cross-sectional view of the plug provided by an exemplary embodiment of the present application.

[0038] Reference numerals: 100 - battery cell; 110 - battery cell body; 111 - top wall; 112 - peripheral wall; 113 - bottom wall; 120 - top cover assembly; 121 - top cover body; 122 - adhesive layer; 1221 - first side wall; 1222 - second side wall; 123 - extension body; 1231 - second mating hole; 124 - connecting member; 1241 - first mating hole; 130 - insulating film; 131 - first insulating portion; 132 - second insulating portion; 140 - plug; 141 - first plug; 1411 - clamping block; 142 - connecting body; 1421 - first connection end; 1422 - elastic body; 1423 - second connection end; 1424 - mating cavity; 1425 - card slot; 143 - second plug. Detailed description of the specific implementation

[0039] Next, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0040] Figure 1 Schematic structural diagram of the battery cell provided by an exemplary embodiment of the present application. Figure 2 Schematic structural diagram of the battery cell body provided by an exemplary embodiment of the present application. Figure 3 Schematic structural diagram of the insulating film before folding and the top cover assembly from a first perspective provided by an exemplary embodiment of the present application. Figure 4 Schematic structural diagram of the insulating film before folding and the top cover assembly from a second perspective provided by an exemplary embodiment of the present application. As Figures 1 to 4As shown in the figure, the battery cell 100 provided by the embodiment of the present application may include a battery cell body 110, a top cover assembly 120, and an insulating film 130. The top cover assembly 120 is disposed above the battery cell body 110. The top cover assembly 120 can protect the battery cell body 110, prevent external pollutants from entering the battery cell body 110, and can assist in leading out the current of the battery cell body 110, facilitating the connection of external components. The insulating film 130 can be wrapped around the battery cell body 110 to protect the battery cell body 110, prevent short circuits, prevent fires, etc.

[0041] Specifically, the battery cell body 110 may include a top wall 111, a peripheral wall 112, and a bottom wall 113. The opposite ends of the peripheral wall 112 are respectively connected to the top wall 111 and the bottom wall 113. The top cover assembly 120 may include a top cover body 121 and an insulating layer 122. The insulating layer 122 is connected to the top cover body 121, and the insulating layer 122 is disposed between the top wall 111 and the surface of the top cover body 121 facing the battery cell body 110. It should be understood that the insulating layer 122 can insulate and separate the top cover body 121 from the battery cell body 110, preventing the top cover body 121 from contacting the battery cell body 110, thereby avoiding short - circuit situations. The insulating film 130 is integrally formed with the insulating layer 122. After being folded, the insulating film 130 can be wrapped around the peripheral wall 112 and the bottom wall 113, and the insulating film 130 plays a role in protecting and insulating the peripheral wall 112 and the bottom wall 113.

[0042] In practical applications, usually, after connecting the insulating layer 122 to the top cover body 121 first, the entire top cover assembly 120 is assembled on the top wall 111 of the battery cell body 110, and then the insulating film 130 is folded so that the insulating film 130 is wrapped around the peripheral wall 112 and the bottom wall 113.

[0043] Based on the reason of setting the insulating layer 122 on the top cover body 121, the insulating film 130 in the embodiment of the present application does not need to wrap the top wall 111 of the battery cell body 110 anymore, reducing the consumption of the insulating film 130. Therefore, there is no need to connect the insulating film 130 to the top cover body 121 through an additional hot - melting process, which can effectively improve production efficiency. At the same time, when welding the connection piece (the connection piece is disposed on the top cover body 121), there is no insulating film 130 wrapped on the top wall 111 of the battery cell body 110, so there is no situation where the insulating film 130 affects the welding quality of the connection piece. There is also no risk of virtual soldering caused by partial melting of the insulating film 130 during the welding of the connection piece and the pole due to the positioning deviation of the insulating film 130 during punching in the related art, effectively improving the safety of the battery cell 100.

[0044] In one embodiment, the material of the insulating layer 122 can be selected from plastics, rubbers, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), etc. In this way, not only can the insulating function be achieved, but also it is convenient for processing and manufacturing, facilitating the relative fixation of the insulating layer 122 and the top cover body 121, and effectively improving the production efficiency.

[0045] In one embodiment, the thickness of the insulating layer 122 is greater than that of the insulating film 130, avoiding the situation where the insulating film 130 is burned through when the insulating film 130 is laser welded to the top wall 111.

[0046] In one embodiment, the surface of the insulating film 130 is sprayed with PVDF (polyvinylidene fluoride) glue, and the insulating film 130 is heated and fixed to the peripheral wall 112 and the bottom wall 113 by a hot press plate.

[0047] It should be noted that the aforementioned insulating layer 122 and insulating film 130 are integrally formed. In this way, after the insulating layer 122 is fixedly connected to the top cover body 121, the insulating film 130 can be directly folded ( Figure 3 and Figure 4 shows the unfolded state of the insulating film 130 before folding. Folding is carried out in the states shown in Figure 3 and Figure 4 as will be described in detail later), so that the insulating film 130 covers the peripheral wall 112 and the bottom wall 113 of the battery cell body 110, eliminating the step of welding the insulating film 130 to the insulating layer 122 before folding, simplifying the production process, and effectively improving the overall production efficiency of the battery cell 100.

[0048] Figure 5 This is a schematic structural diagram of the top cover assembly provided by an exemplary embodiment of the present application. As shown in Figures 3 to 5 the insulating layer 122 includes a first side wall 1221 and a second side wall 1222 that are connected to each other. The length of the first side wall 1221 is less than that of the second side wall 1222. The first side wall 1221 is integrally formed with the insulating film 130. In this way, the connection length between the first side wall 1221 and the insulating film 130 is shorter, which is beneficial to shortening the processing and manufacturing time and improving the production efficiency.

[0049] In one embodiment, the insulating film 130 can also be integrally formed with the second side wall 1222.

[0050] In one embodiment, the insulating layer 122 has a cuboid structure. The two opposite first side walls 1221 are parallelly distributed, and the two opposite second side walls 1222 are parallelly distributed. The insulating film 130 can be integrally formed with one of the first side walls 1221 or the second side walls 1222.

[0051] As shown in Figure 1 and Figure 5As shown, the top cover assembly 120 may further include an extension body 123. The extension body 123 is connected to the second side wall 1222, and the extension body 123 can rotate or bend relative to the second side wall 1222.

[0052] In practical applications, after the insulating film 130 is wrapped around the peripheral wall 112 of the battery cell body 110, the extension body 123 can be rotated or bent so that the extension body 123 abuts against the insulating film 130 wrapped on the peripheral wall 112. In this way, the extension body 123 can fix the insulating film 130 and prevent the insulating film 130 from detaching from the peripheral wall 112.

[0053] In one embodiment, the two second side walls 1222 are distributed in parallel. The two second side walls 1222 are both connected with the extension body 123, and the two extension bodies 123 respectively press against the insulating film 130 at different positions, which can further improve the fixing effect on the insulating film 130.

[0054] Figure 6 It is a schematic structural diagram of the extension body provided by an exemplary embodiment of the present application. Figure 7 It is a schematic structural diagram of the plug provided by an exemplary embodiment of the present application. As Figures 5 to 7 shown, a connecting member 124 is provided on the surface of the insulating layer 122 away from the top cover body 121. The connecting member 124 is provided with a first mating hole 1241, and the extension body 123 is provided with a second mating hole 1231. The battery cell 100 may further include a plug 140, and the plug 140 is fitted into the first mating hole 1241 and the second mating hole 1231.

[0055] In practical applications, after the extension body 123 abuts against the insulating film 130, the plug 140 can be used to fit into the first mating hole 1241 and the second mating hole 1231, so that the extension body 123 after rotation or bending and the insulating layer 122 are relatively locked. Without disassembling the plug 140, it is ensured that the extension body 123 will not rotate or bend relative to the insulating layer 122 again, so as to ensure that the extension body 123 continuously abuts against the insulating film 130, and further prevent the insulating film 130 from detaching from the battery cell body 110.

[0056] In one embodiment, the plug 140 can be selected from screws, pin shafts, etc.

[0057] As Figure 7As shown, the plug-in 140 includes a first plug 141, a connecting body 142, and a second plug 143. The first plug 141 and the second plug 143 are respectively detachably inserted into opposite ends of the connecting body 142. At least part of the connecting body 142 is assembled in the first mating hole 1241. The outer diameters of the ends of the first plug 141 and the second plug 143 that are away from the connecting body 142 are respectively greater than the outer diameters of the opposite ends of the connecting body 142, and the outer diameters of the ends of the first plug 141 and the second plug 143 that are away from the connecting body 142 are both greater than the inner diameter of the second mating hole 1231.

[0058] In practical applications, along the thickness direction of the battery cell body 110 ( Figure 1 and Figure 7 the directions indicated by arrows C and D), the second side walls 1222 on both opposite sides of the insulating layer 122 are both connected to the extension body 123. The end of the first plug 141 that is away from the connecting body 142 abuts against the outside of the second mating hole 1231 of one of the extension bodies 123, and the end of the second plug 143 that is away from the connecting body 142 abuts against the outside of the second mating hole 1231 of the other extension body 123. In this way, the ends of the first plug 141 and the second plug 143 that are away from the connecting body 142 can both play a limiting role, which can prevent the connecting body 142 from disengaging from the first mating hole 1241 and / or the second mating hole 1231, and ensure that the extension body 123 and the insulating layer 122 are in a locked state for a long time.

[0059] In one embodiment, when the length of the connecting body 142 is greater than the length of the first mating hole 1241, a part of the connecting body 142 is assembled in the first mating hole 1241, and another part of the connecting body 142 is assembled in the second mating hole 1231. The first plug 141 is detachably inserted into one end of the connecting body 142, and a part of the first plug 141 is assembled in the second mating hole 1231 of one of the extension bodies 123. The second plug 143 is detachably inserted into the other end of the connecting body 142, and a part of the second plug 143 is assembled in the second mating hole 1231 of the other extension body 123.

[0060] In one embodiment, when the length of the connecting body 142 is less than the length of the first mating hole 1241, the whole of the connecting body 142 is assembled in the first mating hole 1241. The first plug 141 is detachably inserted into one end of the connecting body 142, and a part of the first plug 141 is assembled in the first mating hole 1241 and the second mating hole 1231 of one of the extension bodies 123. The second plug 143 is detachably inserted into the other end of the connecting body 142, and a part of the second plug 143 is assembled in the first mating hole 1241 and the second mating hole 1231 of the other extension body 123.

[0061] In one embodiment, when the length of the connecting body 142 is equal to the length of the first mating hole 1241, the entire connecting body 142 is assembled within the first mating hole 1241. One end of the first plug 141 is detachably inserted into the connecting body 142, and a part of the first plug 141 is assembled within the second mating hole 1231 of one of the extending bodies 123. The second plug 143 is detachably inserted into the other end of the connecting body 142, and a part of the second plug 143 is assembled within the second mating hole 1231 of the other extending body 123.

[0062] In one embodiment, after at least a part of the connecting body 142 is assembled within the first mating hole 1241, a quick-setting gel can be dropped in to lock the connecting body 142 within the first mating hole 1241 and the second mating hole 1231.

[0063] In one embodiment, the detachable connection structure between the first plug 141 and the connecting body 142 can include a snap-fit structure, a threaded fit, etc. Similarly, the detachable connection structure between the first plug 141 and the connecting body 142 can include a snap-fit structure, a threaded fit, etc.

[0064] In one embodiment, during the cyclic use of the battery, the battery cell 100 may expand, resulting in abnormal lithium plating. Based on this, by using the cooperation between the aforementioned extending body 123 and the plug-in 140, the extending body 123 abuts against the insulating film 130 on the outer side of the battery cell body 110. That is, when the battery cell 100 expands, the extending body 123 can exert a certain restricting effect on the battery cell body 110, restricting the expansion of the battery cell 100 and avoiding the problem of abnormal lithium plating.

[0065] Taking the detachable connection structure between the first plug 141 and the connecting body 142 as an example, Figure 8 is a cross-sectional view of the plug-in provided by an exemplary embodiment of the present application. As Figure 8 shown, the connecting body 142 is provided with a mating cavity 1424. The inner wall of the mating cavity 1424 is provided with a card slot 1425. The end of the first plug 141 is provided with a card block 1411. The end of the first plug 141 extends into the mating cavity 1424, and the card block 1411 is snap-fitted with the card slot 1425.

[0066] As Figure 7 shown, the connecting body 142 includes a first connection end 1421, an elastic body 1422, and a second connection end 1423. The first connection end 1421 is detachably connected to the first plug 141, the second connection end 1423 is detachably connected to the second plug 143, and the opposite ends of the elastic body 1422 are respectively connected to the first connection end 1421 and the second connection end 1423.

[0067] In practical applications, during the operation of the battery cell body 110, heat is generated, and the volume of the battery cell body 110 expands when heated. The elastomer 1422 can then elastically elongate accordingly to adapt to the volume of the expanded battery cell body 110. In this way, it is possible to prevent the plug-in component 140 from being stretched and broken due to the volume expansion of the battery cell body 110.

[0068] In one embodiment, the first connection end 1421 and the first plug 141 can be detachably connected, and the second connection end 1423 and the second plug 143 can be non-detachably connected (such as by gluing or welding).

[0069] In one embodiment, the first connection end 1421 and the first plug 141 can be non-detachably connected (such as by gluing or welding), and the second connection end 1423 and the second plug 143 can be detachably connected.

[0070] In one embodiment, the elastomer 1422 can be a spring, an elastic rubber, etc.

[0071] As Figure 2 and Figure 3 shown, the insulating film 130 includes a first insulating portion 131 and a second insulating portion 132. In the unfolded state of the insulating film 130, at least part of the first insulating portion 131 is connected to the insulating layer 122, and at least another part of the first insulating portion 131 is connected to the second insulating portion 132. When the first insulating portion 131 and the second insulating portion 132 are folded, the first insulating portion 131 can cover a part of the bottom wall 113 and the peripheral wall 112, and the second insulating portion 132 can cover another part of the peripheral wall 112.

[0072] It should be noted that in the embodiment of the present application, after the first insulating portion 131 covers a part of the bottom wall 113 and the peripheral wall 112, the covering structure is a single-layer structure; after the second insulating portion 132 covers another part of the peripheral wall 112, the covering structure is a double-layer structure, that is, after covering the peripheral wall 112, the two layers of the second insulating portion 132 overlap each other.

[0073] It should be noted that in the unfolded state, the thickness of the single-layer first insulating portion 131 is greater than the thickness of the single-layer second insulating portion 132; and in the state where the first insulating portion 131 and the second insulating portion 132 cover the battery cell body 110, the thickness of the single-layer first insulating portion 131 is equal to the thickness of the double-layer second insulating portion 132. In this way, the thickness of the insulating film 130 covering the peripheral wall 112 and the bottom wall 113 of the battery cell body 110 is the same, so that the mechanical strength and thermal stability of different parts of the peripheral wall 112 and the bottom wall 113 of the battery cell body 110 can be kept consistent, effectively improving the safety of the battery cell 100.

[0074] In one embodiment, according to the different unfolded shapes of the first insulating part 131 and the second insulating part 132, the folded first insulating part 131 can also cover a part of the peripheral wall 112, and the second insulating part 132 covers another part of the peripheral wall 112 and the bottom wall 113.

[0075] It should be understood that if the thickness of the insulating film 130 covering the peripheral wall 112 and the bottom wall 113 is too large, it may affect the heat transfer of the battery cell body 110, leading to the risk of overheating of the battery cell body 110, and it will also increase the overall weight and production cost of the battery cell 100; while if the thickness of the insulating film 130 covering the peripheral wall 112 and the bottom wall 113 is too small, there may be a risk of electric leakage in the battery cell body 110, which is likely to cause safety problems. Therefore, it is necessary to limit the thickness of the insulating film 130 covering the peripheral wall 112 and the bottom wall 113 within a certain range.

[0076] Specifically, the thickness of the single-layer first insulating part 131 is A, and A satisfies: 0.08 mm ≤ A ≤ 0.12 mm; the thickness of the single-layer second insulating part 132 is B, and B satisfies: 0.04 mm ≤ B ≤ 0.06 mm. In this way, it can not only meet the requirement that the thickness after the two-layer second insulating part 132 is superimposed is equal to the thickness of the single-layer first insulating part 131, but also ensure that the overall thickness of the insulating film 130 is within an appropriate range, avoiding the risks caused by the thickness of the insulating film 130 being too large or too small as described above.

[0077] In one embodiment, the thickness A can be selected as 0.08 mm, 0.1 mm, 0.12 mm, etc.; the thickness B can be selected as 0.04 mm, 0.05 mm, 0.06 mm, etc.

[0078] In one embodiment, a tape is attached to the junction between different parts of the first insulating part 131. In this way, it can effectively prevent the separation at the junction between different parts of the first insulating part 131, thereby preventing the first insulating part 131 from detaching from the battery cell body 110.

[0079] In one embodiment, a tape is attached to the junction between different parts of the second insulating part 132. In this way, it can effectively prevent the separation at the junction between different parts of the second insulating part 132, thereby preventing the second insulating part 132 from detaching from the battery cell body 110.

[0080] In one embodiment, a tape is attached to the junction between the first insulating part 131 and the second insulating part 132. In this way, it can effectively prevent the separation at the junction between the first insulating part 131 and the second insulating part 132, thereby preventing the first insulating part 131 and the second insulating part 132 from detaching from the battery cell body 110.

[0081] An embodiment of the present application also provides a battery, which includes a housing and a plurality of battery cells 100 as described in the previous embodiment. The plurality of battery cells 100 are disposed in the housing, and the housing plays a protective role for the plurality of battery cells 100. This battery has all the functions of the aforementioned battery cell 100, and the beneficial effects of this battery can refer to the beneficial effects of the aforementioned battery cell 100.

[0082] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the specific details disclosed above are only for illustrative and easy-to-understand purposes, not limitations. These details do not limit the present application to necessarily adopt the above specific details to implement.

[0083] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with each other.

[0084] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0085] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0086] The above description has been given for purposes of illustration and description. In addition, this description does not intend to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A battery cell, characterized in that, Comprising: The battery cell body (110) includes a top wall (111), a peripheral wall (112), and a bottom wall (113), and opposite ends of the peripheral wall (112) are respectively connected to the top wall (111) and the bottom wall (113); The top cover assembly (120) includes a top cover body (121) and an insulating layer (122), the insulating layer (122) is connected to the top cover body (121), and the insulating layer (122) is disposed between the top wall (111) and the surface of the top cover body (121) facing the battery cell body (110); The insulating film (130) is integrally formed with the insulating layer (122), and the insulating film (130) is used to wrap the peripheral wall (112) and the bottom wall (113) after folding.

2. The battery cell according to claim 1, characterized in that, The insulating layer (122) includes a first side wall (1221) and a second side wall (1222) connected to each other, the length of the first side wall (1221) is less than the length of the second side wall (1222), and the first side wall (1221) is integrally formed with the insulating film (130).

3. The battery cell according to claim 2, wherein, The top cover assembly (120) further includes: An extension body (123) connected to the second side wall (1222), and the extension body (123) is used to rotate or bend relative to the second side wall (1222) to abut against the insulating film (130) already wrapped on the peripheral wall (112).

4. The battery cell according to claim 3, characterized in that, A connecting member (124) is provided on the surface of the insulating layer (122) away from the top cover body (121), the connecting member (124) is provided with a first mating hole (1241), and the extension body (123) is provided with a second mating hole (1231); The battery cell further includes: A plug-in member (140) is fitted into the first mating hole (1241) and the second mating hole (1231) to relatively lock the rotated or bent extension body (123) and the insulating layer (122).

5. The battery cell according to claim 4, characterized in that, The plug-in member (140) includes a first plug (141), a connecting body (142), and a second plug (143), the first plug (141) and the second plug (143) are respectively detachably inserted into opposite ends of the connecting body (142), and at least a part of the connecting body (142) is assembled in the first mating hole (1241); The outer diameters of the ends of the first plug (141) away from the connecting body (142) and the second plug (143) away from the connecting body (142) are respectively greater than the outer diameters of the opposite ends of the connecting body (142), and the outer diameters of the ends of the first plug (141) and the second plug (143) away from the connecting body (142) are both greater than the inner diameter of the second mating hole (1231). Along the thickness direction of the battery cell body (110), the ends of the first plug (141) and the second plug (143) away from the connecting body (142) abut against the outside of the second mating hole (1231).

6. The battery cell according to claim 5, wherein The connecting body (142) includes a first connecting end (1421), an elastic body (1422), and a second connecting end (1423). Opposite ends of the elastic body (1422) are respectively connected to the first connecting end (1421) and the second connecting end (1423); The first connecting end (1421) is detachably connected to the first plug (141), and / or the second connecting end (1423) is detachably connected to the second plug (143).

7. The battery cell according to any one of claims 1 to 6, characterized in that, The insulating film (130) includes a first insulating portion (131) and a second insulating portion (132). In the unfolded state of the insulating film (130), at least part of the first insulating portion (131) is connected to the insulating layer (122), at least another part of the first insulating portion (131) is connected to the second insulating portion (132). The first insulating portion (131) is used to cover a part of the bottom wall (113) and the peripheral wall (112), and the second insulating portion (132) is used to cover another part of the peripheral wall (112); Wherein, in the unfolded state, the thickness of the single-layer first insulating portion (131) is greater than the thickness of the single-layer second insulating portion (132); in the state where the first insulating portion (131) and the second insulating portion (132) cover the battery cell body (110), the thickness of the single-layer first insulating portion (131) is equal to the thickness of the double-layer second insulating portion (132).

8. The cell according to claim 7, wherein The thickness of the single-layer first insulating portion (131) is A, and A satisfies: 0.08 mm ≤ A ≤ 0.12 mm; The thickness of the single-layer second insulating portion (132) is B, and B satisfies: 0.04 mm ≤ B ≤ 0.06 mm.

9. The battery cell according to claim 7, wherein, A tape is attached to the joint between different parts of the first insulating portion (131); and / or, A tape is attached to the joint between different parts of the second insulating portion (132); and / or, A tape is attached to the joint between the first insulating portion (131) and the second insulating portion (132).

10. A battery, characterized in that, Comprising: A housing; Multiple battery cells as described in any one of claims 1 to 9, and the multiple battery cells are arranged in the housing.

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