Battery cell and electric device

Abstract

The application relates to a battery cell and an electric device, and relates to the technical field of batteries.The battery cell comprises a pole group, a cover plate assembly and an insulating film, at least one end of the pole group is provided with a first recessed part; the cover plate assembly comprises a first protruding part, the first protruding part is matched with the first recessed part, the first protruding part comprises oppositely arranged first and second sides, the second side is provided with a first extension plate in the direction close to the pole group; the insulating film covers at least part of the outer wall of the pole group, the insulating film comprises oppositely arranged first and second film walls, at least one end of the first film wall is provided with a second recessed part, at least one end of the second film wall is provided with a third recessed part, the first protruding part is arranged between the second and third recessed parts, part of the first film wall is attached to the first extension plate, and part of the second film wall is attached to the first side; wherein the depth of the second recessed part is greater than that of the third recessed part. The battery cell and the electric device can improve the problem that the insulating film is easily interfered with the cover plate assembly.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and an electrical device. Background Technology

[0002] Currently, battery cells consist of electrode groups and a cover plate assembly. The cover plate assembly covers one end of the electrode group and protrudes from the end of the electrode group, occupying external space and affecting space utilization. In related technologies, a groove is provided at one end of the electrode group, and a protrusion is provided in the lower plastic of the cover plate assembly. The protrusion is embedded in the groove, which can reduce the amount of external space occupied by the cover plate assembly. However, after providing a protrusion in the lower plastic, the shape of the insulating film (covering the outer wall of the electrode group) does not match the lower plastic, and the insulating film is prone to interference with the cover plate assembly, affecting the insulation effect. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a battery cell and an electrical device that can improve the problem of easy interference between the insulating film and the cover plate assembly.

[0004] Firstly, a battery cell is provided, comprising:

[0005] A pole assembly, wherein at least one end of the pole assembly is provided with a first recess;

[0006] The cover plate assembly includes a first protrusion that engages with a first recess. The first protrusion includes a first side and a second side disposed opposite to each other, and the second side is provided with a first extension plate protruding toward the pole group.

[0007] An insulating film covers at least a portion of the outer wall of the electrode assembly. The insulating film includes a first membrane wall and a second membrane wall disposed opposite to each other. At least one end of the first membrane wall has a second recess, and at least one end of the second membrane wall has a third recess. A first protrusion is disposed between the second recess and the third recess. A portion of the first membrane wall is attached to the first extension plate, and a portion of the second membrane wall is attached to the first side. The depth of the second recess is greater than the depth of the third recess.

[0008] According to a first aspect of this application, the overlap length between the first membrane wall and the first extension plate in a first direction is greater than the overlap length between the second membrane wall and the first side in the first direction; wherein, the first direction characterizes the length direction of the electrode assembly.

[0009] According to a first aspect of this application, the overlap length between the first membrane wall and the first extension plate in the first direction is B1, wherein B1 satisfies: 2.5mm≤B1≤4mm;

[0010] And / or, the overlap length between the second membrane wall and the first side in the first direction is B2, wherein B2 satisfies: 2.75mm≤B2≤3.4mm.

[0011] According to a first aspect of this application, the distance between the bottom wall of the second recess and the edge of the second side located outside the coverage area of ​​the first membrane wall in a first direction is H1, wherein H1 satisfies: 2.5mm≤H1≤4.7mm; wherein the first direction characterizes the length direction of the electrode group.

[0012] According to a first aspect of this application, the distance between the bottom wall of the third recess and the edge of the first side located outside the coverage area of ​​the second membrane wall in a first direction is H2, wherein H2 satisfies: 0.2mm≤H2≤1mm; wherein the first direction characterizes the length direction of the electrode group.

[0013] According to a first aspect of this application, the length of the bottom wall of the third recess in the second direction is A, wherein A satisfies: 50mm≤A≤88mm; wherein the second direction characterizes the width direction of the pole group.

[0014] According to a first aspect of this application, the cover plate assembly includes:

[0015] The first insulating member has the first protrusion, and the side of the first protrusion away from the electrode group forms a first cavity;

[0016] The cover plate body is located on the side of the first insulating member away from the pole group. The cover plate body is provided with a second protrusion, which cooperates with the first cavity.

[0017] According to a first aspect of this application, the electrode assembly is provided with an electrode tab, the electrode tab being located within the first recess; a second cavity is formed on the side of the second protrusion away from the first protrusion;

[0018] The cover plate assembly also includes:

[0019] A pole post, one end of which passes through the second protrusion and the first protrusion to connect to the tab; the other end of which extends into the second cavity;

[0020] A connecting block is disposed in the second concave cavity, and the connecting block is sleeved on the outer wall of the pole post;

[0021] The second insulating element is placed between the connecting block and the bottom wall of the second cavity.

[0022] According to a first aspect of this application, the first protrusion further includes a third side and a fourth side disposed opposite to each other, the first side, the third side, the second side and the fourth side being connected end to end along the circumferential direction of the first protrusion;

[0023] The third side has a second extension plate protruding towards the pole group, and the fourth side has a third extension plate protruding towards the pole group. One end of the second extension plate and one end of the third extension plate are respectively connected to the two opposite ends of the first extension plate.

[0024] Secondly, an electrical appliance is also provided, including:

[0025] The battery cell as described in the previous embodiment.

[0026] The battery cell and electrical device provided in this application embodiment have a second recess on the first membrane wall, a third recess on the second membrane wall, and a first protrusion between the second and third recesses. The second and third recesses can be adapted to the first protrusion, and the ends of the first and second membrane walls do not extend beyond the first protrusion. Therefore, the insulating film is less likely to interfere with the cover plate assembly. Furthermore, the first protrusion uses an unequal height structure (a first extension plate is provided on the second side, and no extension plate is provided on the first side), and the insulating film is also correspondingly set to an unequal height structure (the depth of the second recess is greater than the depth of the third recess). This achieves at least the following technical effects: First, while ensuring that neither the first nor the second membrane wall interferes with the cover plate assembly, the first membrane wall, the second membrane wall, and the first extension plate can completely cover the opposite sides of the tab, achieving better insulation. Second, while ensuring that neither the first nor the second membrane wall interferes with the cover plate assembly, the amount of insulating film used can be reduced (the depth of the second recess is greater than the depth of the third recess). First, the amount of the first membrane wall used is less than that of the second membrane wall, reducing the weight of the insulating film and thus reducing the overall weight of the battery cell. Second, since the depth of the second recess is greater than that of the third recess, the first membrane wall occupies less space than the second membrane wall, thus reducing the amount of internal space occupied by the insulating film in the battery cell. Third, during the process of wrapping the insulating film on the outer wall of the electrode assembly, since the insulating film adopts an unequal height structure, the scanning device can clearly identify the positions of the second and third recesses (which do not completely overlap), thus playing a role in preventing mistakes during the wrapping process, reducing the assembly error rate, and improving assembly efficiency. Attached Figure Description

[0027] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0028] Figure 1 This is a schematic diagram of the structure of a battery cell provided for an exemplary embodiment of this application.

[0029] Figure 2 A cross-sectional view of a battery cell provided for an exemplary embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the structure of a pole group provided for an exemplary embodiment of this application.

[0031] Figure 4 A schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a first perspective.

[0032] Figure 5 A schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a second perspective.

[0033] Figure 6 This is a schematic diagram of the cover plate assembly and electrode tab provided for an exemplary embodiment of this application.

[0034] Figure 7 A schematic diagram of the structure of an insulating film provided in an exemplary embodiment of this application from a first perspective.

[0035] Figure 8 This is a schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a third-person perspective.

[0036] Figure 9 This is a schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a fourth perspective.

[0037] Figure 10 A schematic diagram of the structure of an insulating film and cover plate assembly provided in an exemplary embodiment of this application from a first perspective.

[0038] Figure 11 A schematic diagram of the insulating film and cover plate assembly provided in an exemplary embodiment of this application from a second perspective.

[0039] Figure 12 A schematic diagram of the structure of an insulating film provided in an exemplary embodiment of this application from a second perspective.

[0040] Figure 13This is a schematic diagram of the insulating film provided in an exemplary embodiment of this application from a third-person perspective.

[0041] Figure 14 A schematic diagram of the structure of the first insulating member and the cover plate body after being detached, as provided in an exemplary embodiment of this application.

[0042] Reference numerals: 100-cell; 110-pole assembly; 111-first recess; 112-tab; 120-cover assembly; 121-first protrusion; 1211-first side; 1212-second side; 1213-third side; 1214-fourth side; 1215-first extension plate; 1216-second extension plate; 1217-third extension plate; 1218-notch area; 122-first insulator; 123-first cavity; 124-cover body; 125-second protrusion; 126-second cavity; 127-pole post; 128-connecting block; 129-second insulator; 130-insulating film; 131-first film wall; 132-second film wall; 133-second recess; 134-third recess; 140-shell. Detailed Implementation

[0043] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0044] Figure 1 This is a schematic diagram of the structure of a battery cell provided for an exemplary embodiment of this application. Figure 2 A cross-sectional view of a battery cell provided for an exemplary embodiment of this application. Figure 1 and Figure 2 As shown, the battery cell 100 provided in this embodiment may include an electrode group 110, a cover plate assembly 120, and a housing 140. The electrode group 110 is disposed within the housing 140, and the cover plate assembly 120 is disposed at one end of the electrode group 110 and connected to the housing 140. On one hand, the housing 140 and the cover plate assembly 120 can protect the electrode group 110; on the other hand, the cover plate assembly 120 can realize the electrical connection between the electrode group 110 and external components, thereby enabling current transmission.

[0045] Figure 3 This is a schematic diagram of the structure of a pole group provided for an exemplary embodiment of this application. Figure 4 This is a schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a first-view perspective. Figures 2 to 4As shown, at least one end of the electrode assembly 110 is provided with a first recess 111, and the cover plate assembly 120 includes a first protrusion 121, which engages with the first recess 111. In this way, the first protrusion 121 and the first recess 111 can mutually limit each other, thereby improving the assembly stability between the electrode assembly 110 and the cover plate assembly 120 and preventing the electrode assembly 110 from shaking within the housing 140.

[0046] In one embodiment, the first recess 111 may be provided at one end of the electrode group 110; or the first recess 111 may be provided at both ends of the electrode group 110.

[0047] Figure 5 A schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a second perspective. Figure 6 This is a schematic diagram of the cover plate assembly and electrode tab provided for an exemplary embodiment of this application. Figures 4 to 6 As shown, the first protrusion 121 includes a first side 1211 and a second side 1212 disposed opposite to each other, and the second side 1212 is provided with a first extension plate 1215 protruding in the direction close to the pole group 110.

[0048] It should be noted that in practical applications, the electrode assembly 110 is provided with electrode tabs 112, which are located within the first recess 111 and are bent within the first recess 111. The first extension plate 1215 can isolate the electrode tabs 112 from the aforementioned housing 140. In this way, the first extension plate 1215 can prevent the electrode tabs 112 from scratching the housing 140 during bending, thus protecting the electrode tabs 112.

[0049] Figure 7 This is a schematic diagram of the structure of an insulating film provided as an exemplary embodiment of this application from a first-view perspective. Figure 2 and Figure 7 As shown, the cell 100 may also include an insulating film 130, which covers at least a portion of the outer wall of the electrode assembly 110. The insulating film 130 can isolate the electrode assembly 110 from the housing 140, preventing the electrode assembly 110 from directly contacting the housing 140.

[0050] like Figure 7 As shown, the insulating film 130 includes a first film wall 131 and a second film wall 132 disposed opposite to each other. At least one end of the first film wall 131 is provided with a second recess 133, and at least one end of the second film wall 132 is provided with a third recess 134. A first protrusion 121 is disposed between the second recess 133 and the third recess 134.

[0051] It should be understood that, compared to the case in the related art where the insulating film 130 is not provided with the second recess 133 and the third recess 134, the second recess 133 and the third recess 134 in the embodiment of this application can be adapted to the first protrusion 121, and the ends of the first film wall 131 and the second film wall 132 will not extend beyond the first protrusion 121. Therefore, the insulating film 130 is less likely to interfere with the cover plate assembly 120.

[0052] In one embodiment, when the electrode assembly 110 has a first recess 111 at both ends, the two first recesses 111 respectively cooperate with the first protrusions 121 of the two cover plate assemblies 120. Correspondingly, the first membrane wall 131 has a second recess 133 at both ends, and the second membrane wall 132 has a third recess 134 at both ends.

[0053] Figure 8 This is a schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a third-person perspective. Figure 9 This is a schematic diagram of the cover plate assembly provided in an exemplary embodiment of this application from a fourth perspective. Figure 10 A schematic diagram of the structure of an insulating film and cover plate assembly provided in an exemplary embodiment of this application from a first perspective. Figure 11 This is a schematic diagram of the insulating film and cover plate assembly provided as an exemplary embodiment of this application, viewed from a second perspective. Figures 7 to 11 As shown, a portion of the first membrane wall 131 is attached to the first extension plate 1215, a portion of the second membrane wall 132 is attached to the first side 1211, and the depth of the second recess 133 is greater than the depth of the third recess 134.

[0054] It should be noted that the first protrusion 121 adopts an unequal height structure (the second side 1212 is provided with a first extension plate 1215, while the first side 1211 is not provided with an extension plate), and the insulating film 130 is also correspondingly set to an unequal height structure (the depth of the second recess 133 is greater than the depth of the third recess 134), which has at least the following technical effects:

[0055] First, while ensuring that neither the first membrane wall 131 nor the second membrane wall 132 interferes with the cover plate assembly 120, the first membrane wall 131, the second membrane wall 132, and the first extension plate 1215 can completely cover the opposite sides of the tab 112, thereby achieving a better insulation effect.

[0056] Second, while ensuring that neither the first membrane wall 131 nor the second membrane wall 132 interferes with the cover plate assembly 120, the amount of insulating film 130 can be reduced (the depth of the second recess 133 is greater than the depth of the third recess 134, and the amount of the first membrane wall 131 is less than the amount of the second membrane wall 132), thereby reducing the weight of the insulating film 130 and thus reducing the overall weight of the battery cell 100.

[0057] Third, since the depth of the second recess 133 is greater than the depth of the third recess 134, the first membrane wall 131 occupies less space than the second membrane wall 132. Therefore, the amount of internal space occupied by the insulating film 130 in the cell 100 can be reduced.

[0058] Fourth, during the process of covering the insulating film 130 onto the outer wall of the electrode assembly 110, since the insulating film 130 adopts an unequal height structure, the scanning device can clearly identify the respective positions of the second recess 133 and the third recess 134 (the second recess 133 and the third recess 134 do not completely overlap), thereby playing a role in preventing mistakes during the covering process, reducing the assembly error rate, and improving assembly efficiency.

[0059] It should be noted that after the first extension plate 1215 is provided on the second side 1212, since the side wall area of ​​the first extension plate 1215 is larger than the area of ​​the first side 1211, the first extension plate 1215 can provide a larger contact area for the first membrane wall 131.

[0060] Specifically, such as Figure 10 and Figure 11 As shown, the first membrane wall 131 and the first extension plate 1215 are in the first direction (which can be understood as the length direction of the electrode assembly 110, see reference). Figure 10 and Figure 11 The overlap length along the X-axis is greater than the overlap length between the second membrane wall 132 and the first side 1211 in the first direction, thus achieving at least the above-mentioned beneficial effects:

[0061] First, the electrolyte between the insulating membrane 130 and the electrode assembly 110 can flow out through the gap between the insulating membrane 130 and the first protrusion 121 and wet the entire electrode assembly 110. Since the overlap length between the second membrane wall 132 and the first side 1211 in the first direction is short, the electrolyte between the second membrane wall 132 and the electrode assembly 110 has a shorter path through the second membrane wall 132 and the first side 1211, making it easier to flow out, which facilitates electrolyte flow.

[0062] Second, since the overlap length between the first membrane wall 131 and the first extension plate 1215 in the first direction is relatively long, during the process of assembling the electrode assembly 110 into the housing 140 (the electrode assembly 110 is installed into the housing 140 along the first direction), the contact area between the first membrane wall 131 and the first extension plate 1215 is large. The first membrane wall 131 is not easy to slide relative to the first extension plate 1215 due to friction, and therefore it is not easy to stack. This can reduce the risk of stacking scratches on the insulating film 130.

[0063] Third, because the overlap length between the first membrane wall 131 and the first extension plate 1215 in the first direction is relatively long, the contact area between the first membrane wall 131 and the first extension plate 1215 is large, and the friction between the first membrane wall 131 and the first extension plate 1215 is large. Therefore, the first membrane wall 131 and the first extension plate 1215 can be relatively fixed without the need for a heat-melting process. In other words, the heat-melting process between the first membrane wall 131 and the first extension plate 1215 can be eliminated, reducing process difficulty and manufacturing costs, and improving production efficiency and 100% yield of the battery cells.

[0064] like Figure 10 and Figure 11 As shown, the overlap length between the first membrane wall 131 and the first extension plate 1215 in the first direction is B1. If the length B1 is too large, the end of the first membrane wall 131 may interfere with the cover plate assembly 120, causing the first membrane wall 131 to wrinkle easily, which in turn may damage the electrode assembly 110. If the length B1 is too small, the first membrane wall 131 may move relative to the first extension plate 1215, affecting the assembly accuracy of the electrode assembly 110, which may also cause damage to the electrode assembly 110 during the assembly process.

[0065] Therefore, in this embodiment, the length B1 is limited to the following range: 2.5mm ≤ B1 ≤ 4mm. This effectively improves the problems caused by the aforementioned length B1 being too large or too small.

[0066] In one embodiment, the length B1 can be selected as 2.5mm, 2.7mm, 3.5mm, 4mm, etc.

[0067] like Figure 10 and Figure 11 As shown, the overlap length between the second membrane wall 132 and the first side 1211 in the first direction is B2. If the length B2 is too large, the end of the second membrane wall 132 may interfere with the cover plate assembly 120, causing the second membrane wall 132 to wrinkle easily, which in turn may damage the electrode assembly 110. If the length B2 is too small, the fixing effect between the second membrane wall 132 and the first side 1211 will be poor. During the assembly of the electrode assembly 110, the second membrane wall 132 may loosen relative to the first side 1211 and wrinkle, which may also damage the electrode assembly 110.

[0068] Therefore, in this embodiment, the length B2 is limited to the following range: 2.75mm ≤ B2 ≤ 3.4mm. This effectively improves the problems caused by the aforementioned length B2 being too large or too small.

[0069] In one embodiment, the length B2 can be selected as 2.75mm, 2.85mm, 3.25mm, 3.4mm, etc.

[0070] like Figure 10 and Figure 11 As shown, it should be noted that in practical applications, since a portion of the first extension plate 1215 is covered by the first membrane wall 131, it is difficult to directly detect the overlap length B1 between the first membrane wall 131 and the first extension plate 1215 in the first direction. Similarly, the overlap length B2 between the second membrane wall 132 and the first side 1211 in the first direction is also difficult to directly detect in practical applications. Therefore, in practical applications, lengths B1 and B2 are usually obtained indirectly by detecting other parameters.

[0071] Specifically, such as Figures 8 to 11 As shown, before the insulating film 130 is assembled, the total length L1 of the second side 1212 and the first extension plate 1215 along the first direction can be measured. After the insulating film 130 is assembled, the distance H1 between the bottom wall of the second recess 133 and the edge of the second side 1212 outside the coverage area of ​​the first film wall 131 in the first direction can be measured. Subtracting H1 from L1 gives the aforementioned B1, i.e., L1-H1=B1.

[0072] Similarly, before the insulating film 130 is assembled, the total length L2 of the first side 1211 along the first direction can be measured. After the insulating film 130 is assembled, the distance H2 between the bottom wall of the third recess 134 and the edge of the first side 1211 outside the coverage area of ​​the second film wall 132 in the first direction can be measured. Subtracting H2 from L2 gives the aforementioned B2, i.e., L2-H2=B2.

[0073] It should be understood that if H1 is too large, it will lead to B1 being too small, resulting in poor fixation between the second diaphragm wall 132 and the first side 1211. During the assembly of the electrode assembly 110, the second diaphragm wall 132 is prone to loosening relative to the first side 1211, causing wrinkles and potentially damaging the electrode assembly 110. If H2 is too small, it will lead to B1 being too large, causing interference between the end of the first diaphragm wall 131 and the cover plate assembly 120, making the first diaphragm wall 131 prone to wrinkles and potentially damaging the electrode assembly 110.

[0074] Therefore, in this embodiment, the spacing H1 is limited to the following range: 2.5mm ≤ H1 ≤ 4.7mm. This effectively improves the problems caused by the spacing H1 being too large or too small.

[0075] In one embodiment, H1 can be selected as 2.5mm, 3mm, 4.5mm, 4.7mm, etc.

[0076] Similarly, if H2 is too large, it will cause B2 to be too small, resulting in poor fixation between the second membrane wall 132 and the first side 1211. During the assembly of the electrode assembly 110, the second membrane wall 132 is prone to loosening relative to the first side 1211, causing wrinkles, which can easily lead to damage to the electrode assembly 110. If H2 is too small, it will cause B2 to be too large, which can easily cause the end of the second membrane wall 132 to interfere with the cover plate assembly 120, causing the second membrane wall 132 to wrinkle easily, which can also easily lead to damage to the electrode assembly 110.

[0077] Therefore, in this embodiment, the spacing H2 is limited to the following range: 0.2mm ≤ H2 ≤ 1mm. This effectively improves the problems caused by the spacing H2 being too large or too small.

[0078] In one embodiment, H2 can be selected from 0.2mm, 0.25mm, 1.9mm, 1mm, etc.

[0079] Figure 12 This is a schematic diagram of the insulating film provided in an exemplary embodiment of this application from a second perspective. Figure 11 and Figure 12 As shown, the bottom wall of the third recess 134 is along the second direction (which can be understood as the width direction of the pole group 110, see reference). Figure 12 The length of the second membrane wall 132 (in the Y-axis direction) is A. If the length A is too large, the third recess 134 will occupy too much of the end area of ​​the second membrane wall 132, which will easily lead to insufficient end strength of the second membrane wall 132 and make it easy to lift up. During the assembly of the pole post 127, the second membrane wall 132 will easily stack and wrinkle, causing damage to the pole assembly 110. If the length A is too small, it will affect the fitting effect between the third recess 134 and the first protrusion 121, causing the end of the second membrane wall 132 to easily interfere with the cover plate assembly 120, causing the second membrane wall 132 to easily wrinkle, which in turn will easily cause damage to the pole assembly 110.

[0080] Therefore, in this embodiment, the length A is limited to the following range: 50mm ≤ A ≤ 88mm. This effectively improves the problems caused by the aforementioned length A being too large or too small.

[0081] In one embodiment, the length A can be selected as 50mm, 55mm, 70mm, 88mm, 90mm, etc.

[0082] Figure 13 This is a schematic diagram of the insulating film provided in an exemplary embodiment of this application from a third-person perspective. Figure 13As shown, the thickness of the insulating film 130 is T. If the thickness T is too large, it will increase the amount of insulating film 130 used, increase the manufacturing cost, and also affect the heat dissipation rate of the electrode assembly 110; if the thickness T is too small, the overall structural strength of the insulating film 130 will be insufficient, and the insulating film 130 will be prone to wrinkles, cracks and other problems.

[0083] Therefore, in this embodiment, the thickness T is limited to the following range: 0.10mm ≤ T ≤ 0.15mm. This effectively improves the problems caused by the aforementioned large or small thickness T.

[0084] In one embodiment, the thickness T can be selected as 0.10 mm, 0.12 mm, 0.15 mm, etc.

[0085] Figure 14 This is a schematic diagram of the structure after the first insulating member and the cover plate body are detached, as provided in an exemplary embodiment of this application. Figure 2 and Figure 14 As shown, the cover plate assembly 120 may include a first insulating member 122 and a cover plate body 124. The first insulating member 122 is provided with the aforementioned first protrusion 121, that is, the first insulating member 122 can cooperate with the first recess 111 through the aforementioned first protrusion 121. A first cavity 123 is formed on the side of the first protrusion 121 away from the electrode group 110. The cover plate body 124 is located on the side of the first insulating member 122 away from the electrode group 110. The cover plate body 124 is provided with a second protrusion 125, which cooperates with the first cavity 123.

[0086] It should be understood that by cooperating with the first protrusion 121 and the first recess 111, the relative positioning between the first insulating member 122 and the pole group 110 can be achieved. By cooperating with the second protrusion 125 and the first cavity 123, the relative positioning between the first insulating member 122 and the cover plate body 124 can be achieved. In this way, the assembly stability between the pole group 110, the first insulating member 122 and the cover plate body 124 can be effectively improved.

[0087] In one embodiment, the first insulating element 122 is made of plastic, and the cover plate body 124 can be made of aluminum plate. The processing and manufacturing of plastic and aluminum plates are simple and convenient, and the manufacturing cost is low.

[0088] like Figure 2 and Figure 14 As shown, the second protrusion 125 forms a second cavity 126 with the side away from the first protrusion 121; the cover plate assembly 120 may also include a pole post 127, one end of which passes through the second protrusion 125 and the first protrusion 121 to connect to the tab 112, so that the tab 112 can be electrically connected to external components through the pole post 127.

[0089] It should be noted that the other end of the pole post 127 (the end of the pole post 127 away from the tab 112) extends into the second cavity 126. In this way, the second cavity 126 can protect the pole post 127. That is, compared with the pole post 127 protruding from the end of the pole assembly 110 and being easily damaged by other objects, the peripheral wall of the second cavity 126 can prevent the pole post 127 from being damaged by other objects, which can effectively extend the service life of the pole post 127.

[0090] like Figure 2 and Figure 14 As shown, the cover plate assembly 120 may further include a connecting block 128 and a second insulating member 129. The connecting block 128 is sleeved on the outer wall of the pole post 127, and the second insulating member 129 is placed between the connecting block 128 and the bottom wall of the second cavity 126. In practical applications, the connecting block 128 and the pole post 127 can be connected by welding, riveting, or other methods, and the second insulating member 129 can be connected to the bottom wall of the second cavity 126 and the connecting block 128 by welding, bonding, or other methods.

[0091] It should be understood that the connecting block 128 can fix the pole post 127 and prevent the pole post 127 from shaking. The second insulating member 129 can separate the connecting block 128 from the bottom wall of the second cavity 126, so that the connecting block 128 and the cover plate body 124 will not be directly connected, thereby preventing the pole post 127 from being directly connected to the cover plate body 124 and preventing short circuit accidents.

[0092] It should be noted that the aforementioned connecting block 128 and the second insulating member 129 are both disposed in the second cavity 126. In this way, the second cavity 126 can also protect the connecting block 128 and the second insulating member 129. The peripheral wall of the second cavity 126 can prevent the connecting block 128 and the second insulating member 129 from being damaged by other objects, which can effectively extend the service life of the second insulating member 129 and the connecting block 128.

[0093] like Figure 4 and Figure 6 As shown, the first protrusion 121 may further include a third side 1213 and a fourth side 1214 disposed opposite to each other, with the first side 1211, the third side 1213, the second side 1212, and the fourth side 1214 connected end to end along the circumference of the first protrusion 121. The third side 1213 is provided with a second extension plate 1216 protruding in the direction close to the electrode group 110, and the fourth side 1214 is provided with a third extension plate 1217 protruding in the direction close to the electrode group 110.

[0094] It should be understood that the second extension plate 1216 and the third extension plate 1217 have similar functions to the first extension plate 1215, which can isolate the tab 112 from the housing 140, prevent the tab 112 from scratching the housing 140 during bending, and protect the tab 112.

[0095] like Figure 6 As shown, it should be noted that one end of the second extension plate 1216 and one end of the third extension plate 1217 are respectively connected to the opposite ends of the first extension plate 1215. In this way, the first extension plate 1215, the second extension plate 1216 and the third extension plate 1217 form a U-shaped structure, which can improve the overall structural strength.

[0096] like Figure 6 As shown, it should be noted that when the first extension plate 1215, the second extension plate 1216 and the third extension plate 1217 form a U-shaped structure, the notch area 1218 corresponding to the second side 1212 can be conveniently used for welding the tab 112.

[0097] The present application will be further described below with reference to specific embodiments and comparative examples.

[0098] Example 1

[0099] The battery cell 100 may include an electrode assembly 110, a cover plate assembly 120, and an insulating film 130. One end of the electrode assembly 110 has a first recess 111. The cover plate assembly 120 includes a first protrusion 121 that engages with the first recess 111. The first protrusion 121 includes a first side 1211 and a second side 1212 disposed opposite to each other. The second side 1212 has a first extension plate 1215 protruding towards the electrode assembly 110. The insulating film 130 covers the outer wall of the electrode assembly 110. The device includes a first membrane wall 131 and a second membrane wall 132 disposed opposite to each other. At least one end of the first membrane wall 131 has a second recess 133, and at least one end of the second membrane wall 132 has a third recess 134. The depth of the second recess 133 is greater than the depth of the third recess 134. A first protrusion 121 is disposed between the second recess 133 and the third recess 134. A portion of the first membrane wall 131 is attached to a first extension plate 1215, and a portion of the second membrane wall 132 is attached to a first side 1211. The overlap length between the first membrane wall 131 and the first extension plate 1215 in a first direction is greater than the overlap length between the second membrane wall 132 and the first side 1211 in the first direction.

[0100] The length A of the bottom wall of the third recess 134 along the second direction is 50 mm.

[0101] The distance between the bottom wall of the second recess 133 and the edge of the second side 1212 located outside the coverage area of ​​the first membrane wall 131 in the first direction is H1, where H1 = 4.50 mm.

[0102] The distance H2 between the bottom wall of the third recess 134 and the edge of the first side 1211 located outside the coverage area of ​​the second membrane wall 132 in the first direction is H2 = 0.25 mm.

[0103] The total length L1 of the second side 1212 and the first extension plate 1215 along the first direction is L1 = 7.00 mm.

[0104] The total length L2 of the first side 1211 along the first direction is L2 = 3.00 mm.

[0105] The thickness T of the insulating film 130 is 0.10 mm.

[0106] The overlap length B1 between the first membrane wall 131 and the first extension plate 1215 in the first direction is B1 = L1 - H1 = 2.50 mm.

[0107] The overlap length B2 between the second membrane wall 132 and the first side 1211 in the first direction is B2 = L2 - H2 = 2.75 mm.

[0108] Example 2

[0109] This embodiment is basically the same as Embodiment 1, except for some parameters. Specifically, the relevant parameters are:

[0110] A = 55mm.

[0111] H1 = 4.30 mm.

[0112] H2 = 0.25 mm.

[0113] L1 = 7.00 mm.

[0114] L2 = 3.10 mm.

[0115] T = 0.10 mm.

[0116] B1 = L1 - H1 = 2.70 mm.

[0117] B2 = L2 - H2 = 2.85 mm.

[0118] Example 3

[0119] This embodiment is basically the same as Embodiment 1, except for some parameters. Specifically, the relevant parameters are:

[0120] A = 62mm.

[0121] H1 = 3.90 mm.

[0122] H2 = 0.25 mm.

[0123] L1 = 7.00 mm.

[0124] L2 = 3.20 mm.

[0125] T = 0.15 mm.

[0126] B1 = L1 - H1 = 3.10 mm.

[0127] B2 = L2 - H2 = 2.95 mm.

[0128] Example 4

[0129] This embodiment is basically the same as Embodiment 1, except for some parameters. Specifically, the relevant parameters are:

[0130] A = 70mm.

[0131] H1 = 3.70 mm.

[0132] H2 = 0.25 mm.

[0133] L1 = 7.00 mm.

[0134] L2 = 3.50 mm.

[0135] T = 0.15 mm.

[0136] B1 = L1 - H1 = 3.30 mm.

[0137] B2 = L2 - H2 = 3.25 mm.

[0138] Example 5

[0139] This embodiment is basically the same as Embodiment 1, except for some parameters. Specifically, the relevant parameters are:

[0140] A = 75mm.

[0141] H1 = 3.50 mm.

[0142] H2 = 0.30 mm.

[0143] L1 = 7.00 mm.

[0144] L2 = 3.50 mm.

[0145] T = 0.10 mm.

[0146] B1 = L1 - H1 = 3.50 mm.

[0147] B2 = L2 - H2 = 3.20m.

[0148] Example 6

[0149] This embodiment is basically the same as Embodiment 1, except for some parameters. Specifically, the relevant parameters are:

[0150] A = 88mm.

[0151] H1 = 3.00 mm.

[0152] H2 = 1.00 mm.

[0153] L1 = 7.00 mm.

[0154] L2 = 4.00 mm.

[0155] T = 0.15 mm.

[0156] B1 = L1 - H1 = 4.00 mm.

[0157] B2 = L2 - H2 = 3.00 mm.

[0158] Comparative Example 1

[0159] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0160] A = 70mm.

[0161] H1 = 4.70 mm.

[0162] H2 = 0.20 mm.

[0163] L1 = 7.00 mm.

[0164] L2 = 3.50 mm.

[0165] T = 0.15 mm.

[0166] B1 = L1 - H1 = 2.30 mm.

[0167] B2 = L2 - H2 = 3.30 mm.

[0168] Comparative Example 2

[0169] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0170] A = 70mm.

[0171] H1 = 2.50 mm.

[0172] H2 = 0.20 mm.

[0173] L1 = 7.00 mm.

[0174] L2 = 3.50 mm.

[0175] T = 0.15 mm.

[0176] B1 = L1 - H1 = 4.50 mm.

[0177] B2 = L2 - H2 = 3.30 mm.

[0178] Comparative Example 3

[0179] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0180] A = 70mm.

[0181] H1 = 3.70 mm.

[0182] H2 = 0.90 mm.

[0183] L1 = 7.00 mm.

[0184] L2 = 3.50 mm.

[0185] T = 0.15 mm.

[0186] B1 = L1 - H1 = 3.30 mm.

[0187] B2 = L2 - H2 = 2.60 mm.

[0188] Comparative Example 4

[0189] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0190] A = 70mm.

[0191] H1 = 3.70 mm.

[0192] H2 = 0.60 mm.

[0193] L1 = 7.00 mm.

[0194] L2 = 4.50 mm.

[0195] T = 0.15 mm.

[0196] B1 = L1 - H1 = 3.30 mm.

[0197] B2 = L2 - H2 = 3.90 mm.

[0198] Comparative Example 5

[0199] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0200] A = 70mm.

[0201] H1 = 3.70 mm.

[0202] H2 = 0.20 mm.

[0203] L1 = 7.00 mm.

[0204] L2 = 3.50 mm.

[0205] T = 0.15 mm.

[0206] B1 = L1 - H1 = 3.30 mm.

[0207] B2 = L2 - H2 = 3.30 mm.

[0208] Comparative Example 6

[0209] This comparative example is basically the same as Example 1, except for some parameters. Specifically, the relevant parameters are:

[0210] A = 90mm.

[0211] H1 = 3.70 mm.

[0212] H2 = 0.25 mm.

[0213] L1 = 7.00 mm.

[0214] L2 = 3.50 mm.

[0215] T = 0.15 mm.

[0216] B1 = L1 - H1 = 3.30 mm. B2 = L2 - H2 = 3.25 mm. Test results:

[0217] The results are shown in Table 1.

[0218] Table 1

[0219]

[0220]

[0221]

[0222] This application embodiment also provides an electrical device that may include the battery cell 100 as described in the previous embodiment and has all the functions of the battery cell 100.

[0223] It should be noted that the beneficial effects of this electrical device can be compared with the beneficial effects of the aforementioned battery cell 100.

[0224] In one embodiment, the electrical equipment may include vehicles, mobile phones, ships, elevators, etc.

[0225] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0226] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0227] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0228] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0229] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery cell, characterized in that, include: A pole assembly, wherein at least one end of the pole assembly is provided with a first recess; The cover plate assembly includes a first protrusion that engages with a first recess. The first protrusion includes a first side and a second side disposed opposite to each other, and the second side is provided with a first extension plate protruding toward the pole group. An insulating film covers at least a portion of the outer wall of the electrode assembly. The insulating film includes a first membrane wall and a second membrane wall disposed opposite to each other. At least one end of the first membrane wall has a second recess, and at least one end of the second membrane wall has a third recess. A first protrusion is disposed between the second recess and the third recess. A portion of the first membrane wall is attached to the first extension plate, and a portion of the second membrane wall is attached to the first side. The depth of the second recess is greater than the depth of the third recess. Wherein, the overlap length between the first membrane wall and the first extension plate in the first direction is greater than the overlap length between the second membrane wall and the first side in the first direction; the overlap length between the first membrane wall and the first extension plate in the first direction is B1, wherein B1 satisfies: 2.5mm≤B1≤4mm; the overlap length between the second membrane wall and the first side in the first direction is B2, wherein B2 satisfies: 2.75mm≤B2≤3.4mm; the length of the bottom wall of the third recess in the second direction is A, wherein A satisfies: 50mm≤A≤88mm; Wherein, the first direction represents the length direction of the pole group, and the second direction represents the width direction of the pole group.

2. The battery cell according to claim 1, characterized in that, The distance between the bottom wall of the second recess and the edge of the second side located outside the coverage area of ​​the first membrane wall in the first direction is H1, wherein H1 satisfies: 2.5mm≤H1≤4.7mm; wherein the first direction represents the length direction of the electrode group.

3. The battery cell according to claim 1, characterized in that, The distance between the bottom wall of the third recess and the edge of the first side outside the coverage area of ​​the second membrane wall in the first direction is H2, wherein H2 satisfies: 0.2mm≤H2≤1mm; wherein the first direction represents the length direction of the electrode group.

4. The battery cell according to claim 1, characterized in that, The cover plate assembly includes: The first insulating member has the first protrusion, and the side of the first protrusion away from the electrode group forms a first cavity; The cover plate body is located on the side of the first insulating member away from the pole group. The cover plate body is provided with a second protrusion, which cooperates with the first cavity.

5. The battery cell according to claim 4, characterized in that, The electrode assembly is provided with electrode tabs, which are located within the first recess; the second protrusion forms a second cavity on the side away from the first protrusion. The cover plate assembly also includes: A pole post, one end of which passes through the second protrusion and the first protrusion to connect to the tab; the other end of which extends into the second cavity; A connecting block is disposed in the second concave cavity, and the connecting block is sleeved on the outer wall of the pole post; The second insulating element is placed between the connecting block and the bottom wall of the second cavity.

6. The battery cell according to claim 4, characterized in that, The first protrusion also includes a third side and a fourth side disposed opposite to each other, and the first side, the third side, the second side and the fourth side are connected end to end along the circumferential direction of the first protrusion; The third side has a second extension plate protruding towards the pole group, and the fourth side has a third extension plate protruding towards the pole group. One end of the second extension plate and one end of the third extension plate are respectively connected to the two opposite ends of the first extension plate.

7. An electrical appliance, characterized in that, include: The battery cell as described in any one of claims 1 to 6.

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