Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell, the cover plate assembly comprises a cover plate body, an insulating sheet, a lower plastic part and a pole, the pole is mounted on the inner side of the cover plate body, and one end of the pole penetrates through the cover plate body and extends to the outer side of the cover plate body; the lower plastic part is mounted between the pole and the inner side of the cover plate body, and insulating sheets are arranged on the inner side surfaces of the cover plate body on the two sides of the lower plastic part. It can be seen that all lower plastic part structures except the pole positions are omitted, only the thin insulation sheet is arranged on the cover plate body, the structure is simple, the forming process is mature, compared with a lower plastic part with a certain thickness and the length of the whole cover plate body in the prior art, the material cost is low, the occupied space of a pole group is reduced, and the cost is reduced. The space utilization rate is greatly improved, the capacity of the battery cell is improved, the insulation sheet is tightly attached to the cover plate body, the cover plate body serves as a basis, the whole cover plate is not prone to deformation, and therefore the situation that the tabs are clamped in the gaps is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Art

[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium batteries are the core components of battery pack safety and assembly, and their structural design is crucial to the safety of batteries. Lithium batteries include a shell, an electrode group and a cover assembly, wherein the electrode group is installed in the shell, and a cover assembly is provided at at least one end of the shell along a preset direction. The cover assembly generally includes a bare aluminum plate and a lower plastic structure, wherein the lower plastic is installed on the lower surface of the bare aluminum plate and extends over the entire length of the bare aluminum plate, that is, on the side close to the electrode group. The height of the lower plastic is generally about 5mm, which occupies the space of the electrode group, reduces the space utilization rate, reduces the battery capacity, and has a high material cost. In addition, the lower plastic is generally soft and easy to shrink and deform. When the cover plate is matched and the pole ear is welded, there will be a risk of deformation. If the lower plastic and the bare aluminum plate are not matched evenly, there will be a risk of the pole ear being stuck in the gap. Utility Model Content

[0003] The purpose of the present application is to provide a cover assembly and a battery cell, which to a certain extent solves the technical problem that the lower plastic of the cover assembly of the lithium battery cell in the prior art occupies a large space, reduces the space utilization rate, reduces the battery cell capacity, and has a high material cost. In addition, the lower plastic is easy to shrink and deform, and after deformation, it is easy to become uneven with the bare aluminum plate, which ultimately causes the tab to be stuck in the gap.

[0004] The present application provides a cover assembly, comprising: a cover body, an insulating sheet, a lower plastic part and a pole; wherein the pole is installed on the inner side of the cover body, and one end of the pole passes through the cover body and extends to the outer side of the cover body; the lower plastic part

[0005] The insulating sheets are installed between the pole and the inner side of the cover body, and the inner side surfaces of the cover body located on both sides of the lower plastic part are provided with the insulating sheets.

[0006] In the above technical solution, further, the pole includes a column and a connecting portion connected to each other; wherein the column is arranged on a side of the connecting portion close to the cover body; the column is sequentially passed through the lower plastic part and the cover body; the connecting portion

[0007] The side of the cover plate facing away from the cover plate body is used to abut against the pole ear of the pole group and are connected by welding.

[0008] In any of the above technical solutions, further, the cover assembly also includes a sealing ring, which is in a convex shape and is sleeved on the outside of the column and abuts against a side surface of the connecting part close to the cover body; the sealing ring is pressed between the cover body, the column and the connecting part.

[0009] In any of the above technical solutions, further, the lower plastic part is a trough structure, the connecting portion is installed in the trough structure, and one end of the column sequentially passes through the trough structure and the cover body and extends to the outside of the cover body.

[0010] In any of the above technical solutions, further, the cover plate assembly also includes an upper plastic part and a press-fit component; wherein the press-fit component is sleeved on one end of the pole exposed on the cover plate body, and at least part of the structure of the upper plastic part is pressed between the press-fit component and the cover plate body.

[0011] In any of the above technical solutions, further, the press-fit component is connected to the pole by welding or riveting.

[0012] In any of the above technical solutions, further, the upper plastic part is a trough structure, and the press-fitting component 5 is arranged in the trough structure.

[0013] In any of the above technical solutions, further, the press-fit component and the upper plastic part are integrally injection molded by rubber encapsulation.

[0014] In any of the above technical solutions, further, one of the inner wall of the upper plastic part and the outer wall of the press-fitting component is provided with a limiting protrusion, and the other of the inner wall of the upper plastic part and the outer wall of the press-fitting component is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove.

[0015] In any of the above technical solutions, further, the thickness of the wall of the upper plastic part close to the cover body is H, and 0.5 mm≤H≤1.5 mm.

[0016] In any of the above technical solutions, further, the depth of the limiting groove is L, and 0.2mm≤L≤1.5mm.

[0017] In any of the above technical solutions, further, the lower plastic part is adapted to the pole.

[0018] In any of the above technical solutions, further, the insulating sheet is adhered to the inner surface of the cover body.

[0019] The present application also provides a battery cell, comprising a housing, an electrode group, and a cover plate assembly as described in any of the above technical solutions, wherein the electrode group is arranged in the housing, and the cover plate assembly is sealed at the open end of the housing. Therefore, all the beneficial technical effects of the cover plate assembly are obtained, which will not be described in detail here.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] In the cover assembly provided by the present application, all lower plastic parts except the pole position are eliminated, and only a thinner insulating sheet (with a variety of material options) is set on the cover body. The structure is simple and the molding process is mature. Compared with the lower plastic part with a certain thickness and covering the entire length of the cover body in the prior art, the material cost is low and the space occupied by the pole group is reduced. For example, the height space can be saved by about 3-4mm, which greatly improves the space utilization rate and increases the battery cell capacity. Moreover, the insulating sheet is tightly attached to the cover body, with the cover body as the basis, and the whole is not easy to deform, so the pole ear will not be stuck in the gap.

[0022] In addition, the pole consists of two parts, namely the column and the connecting part. The column mainly serves as the output and extends to the outside through the cover body, while the connecting part serves as the connection structure with the pole ear of the pole group, which increases the welding area and helps to improve the firmness and stability of the welding structure. The connecting part also serves to limit the column.

[0023] In addition, the press-fit components and the upper plastic parts are molded by one-piece injection molding with rubber encapsulation. The process is mature and the structural strength is high. It can be designed as a platform and reduce the development cost of the cover structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 An exploded view of a cover plate assembly provided in an embodiment of the present application;

[0026] Figure 2 An assembly diagram of a cover plate assembly provided in an embodiment of the present application;

[0027] Figure 3 Another assembly diagram of the cover plate assembly provided in an embodiment of the present application;

[0028] Figure 4 Another assembly diagram of the cover plate assembly provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 Cross-sectional view along section AA;

[0030] Figure 6 for Figure 5 A schematic diagram of a local enlarged structure;

[0031] Figure 7 for Figure 4 Cross-sectional view along section BB;

[0032] Figure 8 An assembly diagram of the upper plastic part and the press-fit component provided in the embodiment of the present application;

[0033] Fig. 9 Another assembly diagram of the upper plastic part and the press-fit component provided in the embodiment of the present application;

[0034] Fig.10 for Fig. 9 Cross-sectional view along section CC;

[0035] Fig.11 This is a schematic diagram of the structure of the lower plastic part provided in an embodiment of the present application.

[0036] Reference numerals:

[0037] 1-cover body, 11-installation through hole, 2-insulating sheet, 3-lower plastic part, 31-avoidance through hole, 4-pole, 41-column, 42-connecting part, 5-sealing ring, 6-upper plastic part, 61-limiting protrusion, 7-pressing component. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0039] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0040] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0041] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Refer to the following Figures 1 to 11 The cover plate assembly and the battery cell according to some embodiments of the present application are described.

[0044] Embodiment 1

[0045] See also Figures 1 to 6 As shown, an embodiment of the present application provides a cover assembly, comprising: a cover body 1, an insulating sheet 2, a lower plastic part 3 and a pole 4; wherein the pole 4 is mounted on the inner side of the cover body 1, and one end of the pole 4 passes through the cover body 1 and extends to the outer side of the cover body 1, that is, the cover body 1 is formed with a mounting through hole 11 that passes through the inner and outer sides thereof, and one end of the pole 4 can extend to the outer side of the cover body 1 through the mounting through hole 11, and it should be noted that: the above-mentioned inner side refers to a side close to the pole group, that is, a side located inside the shell of the lithium battery cell, and the above-mentioned outer side refers to a side away from the pole group, that is, a side exposed outside the shell of the lithium battery cell;

[0046] The lower plastic part 3 is installed between the pole 4 and the inner side of the cover body 1, that is, the lower plastic part 3 is provided with an avoidance through hole 31, and one end of the pole 4 sequentially passes through the avoidance through hole 31 and the aforementioned installation through hole 11 to extend to the outer side of the cover body 1; wherein the inner surface of the cover body 1 located on both sides of the lower plastic part 3 is provided with an insulating sheet 2.

[0047] Based on the structure described above, it can be known that in the cover assembly provided by the present application, all lower plastic parts except the position of the pole 4 are eliminated, and only a thinner insulating sheet 2 (with a variety of material options) is set on the cover body 1. The structure is simple and the molding process is mature. Compared with the lower plastic part 3 with a certain thickness and covering the entire length of the cover body 1 in the prior art, the material cost is low and the space occupied by the pole group is reduced. For example, the height space can be saved by about 3-4mm, which greatly improves the space utilization rate and increases the capacity of the battery cell. Moreover, the insulating sheet 2 is tightly attached to the cover body 1, with the cover body 1 as the basis, and the overall shape is not easy to deform, so there will be no situation where the pole ear is stuck in the gap.

[0048] In this embodiment, preferably, Figure 1 , Figure 6 and Figure 7 As shown, the pole 4 includes a column 41 and a connecting portion 42 connected to each other; wherein the column 41 is arranged on a side of the connecting portion 42 close to the cover body 1; the column 41 is sequentially penetrated through the lower plastic part 3 and the cover body 1; the side of the connecting portion 42 away from the cover body 1 is used to abut against the pole ear of the pole group, and preferably, the side of the connecting portion 42 away from the cover body 1 is used to abut against the top of the pole ear (of course, not limited to this, and can also be designed according to actual needs), and are connected by welding.

[0049] According to the structure described above, the pole 4 includes two parts, namely a column 41 and a connecting portion 42. The column 41 is mainly used as an output and extends to the outside through the cover body 1, while the connecting portion 42 is used as a connecting structure with the pole ear of the pole group, which increases the welding area and helps to improve the firmness and stability of the welding structure. In addition, the connecting portion 42 also serves to limit the column 41.

[0050] Further, preferably, the column 41 and the connecting portion 42 may be an integrated structure. Of course, this is not limited to this. The column 41 and the connecting portion 42 may also be connected by welding or other methods.

[0051] Furthermore, preferably, the connecting portion 42 is a flat plate structure with a small thickness, that is, a small dimension in the height direction, and occupies a small space. Of course, it is not limited to this. The connecting portion 42 can also be a block structure, etc., which is specifically designed according to actual needs.

[0052] It should be noted that the aforementioned tabs refer to the tab clusters that have been flattened, and are arranged along the inner surface parallel to the cover body 1 .

[0053] In this embodiment, preferably, Figure 1 , Figure 6 and Figure 7As shown, the cover assembly also includes a sealing ring 5, which is convex in shape and is sleeved on the outside of the column 41 and abuts against a side surface of the connecting portion 42 close to the cover body 1; the sealing ring 5 is pressed between the cover body 1 and the column 41 and the connecting portion 42.

[0054] According to the structure described above, the sealing ring 5 is in a convex shape, a part of which extends into the mounting hole 11 of the cover body 1, and is blocked between the inner wall of the mounting hole 11 and the outer wall of the column 41, playing the role of insulation protection and sealing, while another part of the sealing ring 5 is located in the avoidance hole 31, and this part of the structure blocks the inner surface of the cover body 1 and the connecting part 42 together, playing the role of insulation protection and sealing.

[0055] In this embodiment, preferably, Figure 6 , Figure 7 and Fig.11 As shown, the lower plastic part 3 is a slot structure, the connecting portion 42 is installed in the slot structure, and one end of the column 41 passes through the slot structure and the cover body 1 in sequence and extends to the outside of the cover body 1.

[0056] According to the structure described above, the lower plastic part 3 is designed to be a slot structure, and the connecting part 42 can be located in the slot, so that the pole 4 and the lower plastic part 3 can be assembled more stably and firmly. In addition, the lower plastic part 3 can cover the side of the connecting part 42, further playing the role of insulation protection, which is safer and more reliable.

[0057] Further, preferably, the groove of the lower plastic part 3 is matched with the connecting portion 42 .

[0058] It should be noted that the structure of the lower plastic part 3 is not limited to the above, and it can also be a flat plate structure, that is, it will not wrap the side of the connecting part 42, and is specifically designed according to actual needs.

[0059] In this embodiment, preferably, Figure 1 , Figures 6 to 10 As shown, the cover assembly also includes an upper plastic part 6 and a press-fitting component 7; wherein the press-fitting component 7 is sleeved on one end of the pole 4 exposed to the cover body 1, and at least part of the structure of the upper plastic part 6 is pressed between the press-fitting component 7 and the cover body 1.

[0060] According to the structure described above, the pole 4, the lower plastic part 3 and the cover body 1 are further fixed together by the press-fitting component 7, so that the overall structure is more stable and stronger, and the upper plastic part 6 plays the role of insulating and protecting the press-fitting component 7 and the cover body 1, avoiding problems such as short circuits caused by electrical connections.

[0061] Further, preferably, both the upper plastic part 6 and the press-fitting component 7 are provided with through holes penetrating through both sides thereof along the height direction thereof, so as to play the role of avoiding the pole 4 .

[0062] In this embodiment, preferably, Figure 6 As shown, the press-fitting component 7 is connected to the pole 4 by riveting, which is simple and convenient to operate, and makes the press-fitting component 7 and the pole 4 connected more firmly and stably.

[0063] It should be noted that the connection method between the press-fitting component 7 and the pole 4 is not limited to the above-mentioned riveting method, and other connection methods may also be used, such as welding.

[0064] In this embodiment, preferably, Fig.10 As shown, the upper plastic part 6 is a groove structure, and the press-fitting component 7 is arranged in the groove structure.

[0065] According to the structure described above, the upper plastic part 6 is designed as a groove structure, which can be wrapped around the periphery of the press-fit component 7, so that the overall structure is stronger and more stable, and the insulation performance is improved.

[0066] It should be noted that the structure of the upper plastic part 6 is not limited to the above, and other structures may be adopted. For example, the upper plastic part 6 may be a plate-shaped structure.

[0067] In this embodiment, preferably, Figures 8 to 10 As shown, the press-fit component 7 and the upper plastic part 6 are integrally molded by encapsulation injection molding, which has a mature process and high structural strength, and can be designed as a platform to reduce the development cost of the cover plate structure.

[0068] It should be noted that the assembly method of the press-fitting component 7 and the upper plastic component 6 is not limited to the above, and the two can also be formed separately and then assembled together, which is specifically designed according to actual needs.

[0069] In this embodiment, preferably, Fig.10 As shown, the inner wall of the upper plastic part 6 is provided with a limiting protrusion 61, the outer wall of the press-fitting component 7 is provided with a limiting groove, and the limiting protrusion 61 is arranged in the limiting groove.

[0070] According to the structure described above, it can be known that the limiting protrusion 61 cooperates with the limiting groove to achieve an interlocking connection between the two, making the connection between the two more stable and firm.

[0071] Further, preferably, the opposite side portions of the press-fitting component 7 are provided with the aforementioned limiting protrusions 61, and correspondingly, the opposite inner walls of the upper plastic part 6 are provided with the aforementioned limiting grooves, and the limiting protrusions 61 and the limiting grooves correspond one to one. Of course, this is not limited to this, and the layout of the limiting protrusions 61 and the limiting grooves is not limited to the above, and can also be designed according to actual needs.

[0072] In addition, it should be noted that: it is not limited to setting a limiting protrusion 61 on the inner wall of the upper plastic part 6 and setting a limiting groove on the outer wall of the press-fitting component 7, and the following structure can also be adopted: for example: the outer wall of the press-fitting component 7 is provided with a limiting protrusion 61, the inner wall of the upper plastic part 6 is provided with a limiting groove, and the limiting protrusion 61 is arranged in the limiting groove.

[0073] In this embodiment, preferably, Fig.10 As shown, the thickness of the wall of the upper plastic part 6 close to the cover body 1 is H, and 0.5 mm ≤ H ≤ 1.5 mm.

[0074] According to the structure described above, it can be known that by designing the thickness of the wall of the upper plastic part 6 close to the cover body 1 within a certain range, it can not only play an insulating role but also reduce the material cost.

[0075] In this embodiment, preferably, Fig.10 As shown, the depth of the limiting groove is L, and 0.2 mm ≤ L ≤ 1.5 mm, and preferably, the height of the limiting protrusion 61 is the same as or slightly less than the depth of the limiting groove.

[0076] According to the structure described above, the limiting protrusion 61 and the limiting groove have a certain mutual embedding depth, so that the two can be assembled more firmly and stably, and not too deep, easy to shape, and ensure the strength of the pole 4.

[0077] Further, preferably, when the number of the limiting protrusions 61 is two and the limiting protrusions 61 are matched with the limiting grooves, the distance between the bottoms of the two adjacent limiting grooves, that is, the distance between the two limiting protrusions 61, is W1, and the distance between the tops of the two limiting grooves, that is, the distance between the two side portions of the press-fitted component 7, is W2. It can be seen that 0.4mm≤W2-W1≤3mm.

[0078] In this embodiment, preferably, Figure 1 and Figure 6 As shown, the lower plastic part 3 is adapted to the pole 4, so that the lower plastic part 3 is only arranged on the inner area of ​​the cover body 1 corresponding to the size of the pole 4, and most of the remaining inner surfaces are completely replaced by the insulating sheet 2, which greatly reduces the occupied height space and material cost.

[0079] In this embodiment, preferably, Figure 3 , Figure 5 and Figure 6 As shown, the insulating sheet 2 is adhered to the inner surface of the cover body 1 .

[0080] According to the structure described above, it can be known that the insulating sheet 2 can be pasted on the inner surface of the cover body 1, which is simple and convenient to operate and has high production efficiency.

[0081] In this embodiment, preferably, the material of the insulating sheet 2 can be one of thermoplastic polyesters such as polyethylene terephthalate, also known as PET, high-performance fluoroplastics such as polyperfluoroalkoxy, also known as PFA, and polycarbonate plastic, also known as PC. Of course, it is not limited to this, and the material of the insulating sheet 2 can also be selected according to actual needs.

[0082] Embodiment 2

[0083] The second embodiment of the present application further provides a battery cell, comprising a housing, an electrode group, and the battery cell cover plate described in the first embodiment, wherein the electrode group is installed in the housing, and the battery cell cover plate is sealed on the open end of the housing. Therefore, it has all the beneficial technical effects of the battery cell cover plate, and the same technical features and beneficial effects are not repeated.

[0084] Further, preferably, an opening is formed at one end of the shell along a preset direction, and the opening is equipped with the battery cell cover plate in the present application. Of course, it is not limited to this, and can also be designed according to actual needs. For example: openings are formed at both ends of the shell along the preset direction, and each opening is equipped with the battery cell cover plate, or one of the openings is equipped with the battery cell cover plate, and the other opening is equipped with the cover plate structure in the prior art, etc.

[0085] It should be noted that the preset direction may be the length direction of the shell, or the height direction of the shell, etc., and is specifically designed according to actual needs.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A cover body, an insulating sheet, a lower plastic part and a pole; wherein the pole is installed on the inner side of the cover body, and one end of the pole extends through the cover body to the outer side of the cover body; the lower plastic part is installed between the pole and the inner side of the cover body, and the insulating sheet is provided on the inner surface of the cover body on both sides of the lower plastic part.

2. The cover plate assembly according to claim 1, characterized in that: The pole includes a connected column and a connecting portion; wherein the column is arranged on a side of the connecting portion close to the cover body; the column is sequentially penetrated through the lower plastic part and the cover body; the side of the connecting portion away from the cover body is used to abut against the pole ear of the pole group and is connected by welding.

3. The cover plate assembly according to claim 2, characterized in that: The cover assembly also includes a sealing ring, which is in a convex shape and is sleeved on the outside of the column and abuts against a side surface of the connecting portion close to the cover body; the sealing ring is pressed between the cover body, the column and the connecting portion.

4. The cover plate assembly according to claim 2, characterized in that: The lower plastic part is a trough structure, the connecting part is installed in the trough structure, and one end of the column passes through the trough structure and the cover body in sequence and extends to the outside of the cover body.

5. The cover plate assembly according to claim 1, characterized in that: The cover assembly also includes an upper plastic part and a press-fit component; wherein the press-fit component is sleeved on one end of the pole exposed from the cover body, and at least part of the structure of the upper plastic part is pressed between the press-fit component and the cover body.

6. The cover plate assembly according to claim 5, characterized in that: The press-fit component is connected to the pole by welding or riveting; and / or The upper plastic part is a groove structure, and the press-fitting component is arranged in the groove structure; and / or The press-fitting component and the upper plastic part are integrally injection-molded by rubber encapsulation.

7. The cover plate assembly according to claim 5, characterized in that: One of the inner wall of the upper plastic part and the outer wall of the press component is provided with a limiting protrusion, and the other of the inner wall of the upper plastic part and the outer wall of the press component is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove.

8. The cover plate assembly according to claim 7, characterized in that: The thickness of the wall of the upper plastic part close to the cover body is H, and 0.5mm≤H≤1.5mm; and / or The depth of the limiting groove is L, and 0.2mm≤L≤1.5mm.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The lower plastic part is adapted to the pole; and / or The insulating sheet is adhered to the inner surface of the cover body.

10. A battery cell, characterized in that: It comprises a shell, a pole group and a cover plate assembly as claimed in any one of claims 1 to 9; wherein the pole group is arranged in the shell, and the cover plate assembly is sealed on the open end of the shell.

Images