Battery cell cover plate connecting assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate connecting assembly and a battery cell, and the battery cell cover plate connecting assembly comprises a cover plate, a lower plastic part, a pole and a connecting sheet; wherein the lower plastic part is mounted on the inner side of the cover plate; the connecting piece is installed on the side, away from the cover plate, of the lower plastic part and connected with the lower plastic part through a buckle. The pole is installed on the cover plate and the lower plastic part, and the pole penetrates through the lower plastic part to be connected with the connecting piece. According to the application, a buckle type limiting structure is designed on the lower plastic part below the cover plate, the connecting pieces are limited in the horizontal direction, meanwhile, the buckle type design also limits the connecting pieces in the vertical direction, and opening structures are designed at the upper parts of some buckles, so that the connecting pieces can be conveniently put into the buckles. Besides, the grooves matched with the pole columns are designed in the connecting pieces, the connecting pieces are limited in the horizontal direction and the vertical direction, and the welding effect can be guaranteed only by providing small pressure on the welding tool in the vertical direction.

Description

Technical Field

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

[0002] At present, with the extensive application of lithium-ion batteries, square aluminum shell lithium-ion batteries have occupied a dominant position in the market due to their structural excellence. The cover structure of the welded and injection-molded pole structure is widely used in square aluminum shell lithium-ion batteries because of its high space utilization and low cost. During the assembly of square aluminum shell lithium-ion batteries, the connecting piece is first welded to the pole ear of the core package, and then welded to the pole on the cover structure. During this process, the connecting piece is prone to displacement relative to the cover structure, and the core package is biased to one side, resulting in subsequent difficulty in shell entry. In addition, during the use of the battery cell, the core package is biased to one side for a long time, which may cause deformation of the shell. At the same time, during the laser welding of the pole of the cover and the connecting piece, the pole ear of the core package is prone to lift up the connecting piece, resulting in welding difficulties. Utility Model Content

[0003] The purpose of the present application is to provide a battery cover plate connection assembly and a battery cell, which to a certain extent solves the technical problems existing in the prior art that during the welding process of the connecting piece and the pole on the cover plate structure, the connecting piece is easily offset relative to the cover plate structure, and the core package is biased to one side, resulting in difficulty in subsequent shell insertion, and the core package is biased to one side for a long time during the use of the battery cell, which may cause deformation of the shell. At the same time, during the welding process, the pole ear of the core package is easy to lift up the connecting piece, resulting in difficulty in welding.

[0004] The present application provides a battery cell cover plate connection assembly, comprising: a cover plate, a lower plastic part, a pole and a connecting piece; wherein the lower plastic part is installed on the inner side of the cover plate; the connecting piece is installed on the side of the lower plastic part away from the cover plate, and is connected by a snap; the pole is installed on the cover plate and the lower plastic part, and the pole passes through the lower plastic part to be connected to the connecting piece.

[0005] In the above technical solution, further, the buckle is formed on a side of the lower plastic part facing away from the cover plate.

[0006] In any of the above technical solutions, further, along the width direction of the cover plate, at least one side of the connecting piece is provided with the buckle to limit at least one side of the connecting piece along the width direction of the cover plate.

[0007] In any of the above technical solutions, further, along the width direction of the cover plate, the buckles are provided on both sides of the connecting piece.

[0008] In any of the above technical solutions, further, along the length direction of the cover plate, an opening is formed at one end of the connecting piece away from the edge of the lower plastic part, and at least one of the two opposite inner side walls of the opening is provided with the buckle.

[0009] In any of the above technical solutions, further, along the length direction of the cover plate, at least one side of the connecting piece is provided with the buckle to limit at least one side of the connecting piece along the length direction of the cover plate.

[0010] In any of the above technical solutions, further, along the length direction of the cover plate, a mounting protrusion is formed at one end of the lower plastic part, and the buckle is formed on one side of the mounting protrusion close to the connecting piece.

[0011] In any of the above technical solutions, further, at least part of the buckle includes a supporting portion, a pressing portion and a holding portion connected in sequence; wherein, one end of the supporting portion is connected to the lower plastic part, the pressing portion is arranged at the other end of the supporting portion, and a receiving space for accommodating the connecting piece is formed between the pressing portion and the lower plastic part; the holding portion is connected to the pressing portion and is used for the operator to hold, and the operator can open the pressing portion by prying the holding portion.

[0012] In any of the above technical solutions, further, the connecting piece is formed with a groove, and one end of the pole is installed in the groove.

[0013] In any of the above technical solutions, further, the buckle and the lower plastic part are an integrated structure.

[0014] In any of the above technical solutions, further, the battery cell cover plate connection assembly also includes a heat insulation film, and the heat insulation film is installed between the connecting piece and the lower plastic part.

[0015] In any of the above technical solutions, further, the thermal insulation film is bonded to the lower plastic part or the connecting sheet.

[0016] The present application also provides a battery cell, comprising a shell, a core pack, and a battery cell cover plate connection assembly as described in any of the above technical solutions, wherein the core pack is installed in the shell, the battery cell cover plate connection assembly is installed at the opening of the shell, and the connecting piece of the battery cell cover plate assembly is welded to the pole ear of the core pack. Therefore, all the beneficial technical effects of the battery cell cover plate connection assembly are obtained, which will not be described in detail here.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] In the present application, a snap-on limiting structure is designed on the lower plastic part below the cover plate, which limits the connecting piece in the horizontal direction. At the same time, the snap-on design also limits the connecting piece in the vertical direction. Some of the snaps are designed with an opening structure on the upper part to facilitate placing the connecting piece into the snap.

[0019] In addition, grooves that match the poles are designed on the connecting pieces. The connecting pieces are limited in both horizontal and vertical directions. The welding tooling only needs to provide a small pressure in the vertical direction to ensure the welding effect, and it also has a certain protective effect on the pole ears of the core package.

[0020] In addition, a heat-insulating film is added between the connecting piece and the lower plastic part to improve the hot melting of the lower plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 An exploded view of the cell cover plate connection assembly provided in an embodiment of the present application;

[0023] Figure 2 An assembly diagram of a cell cover plate connection assembly provided in an embodiment of the present application;

[0024] Figure 3 Another assembly diagram of the cell cover plate connection assembly provided in an embodiment of the present application;

[0025] Figure 4 for Figure 3 Cross-sectional view along section AA;

[0026] Figure 5 for Figure 4 The schematic diagram is greatly enlarged at C;

[0027] Figure 6 for Figure 3 Cross-sectional view along section BB;

[0028] Figure 7 for Figure 6 The schematic diagram is greatly enlarged at D;

[0029] Figure 8 Another assembly diagram of the cell cover plate connection assembly provided in an embodiment of the present application;

[0030] Fig. 9A schematic diagram of the structure of the connecting piece provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 1-cover plate, 2-pole, 3-lower plastic part, 31-installing protrusion, 4-connecting piece, 41-opening, 42-groove, 43-embossing, 5-buckle, 51-first buckle, 52-second buckle, 53-support part, 54-pressing part, 55-holding part, 6-thermal insulation film. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Refer to the following Figures 1 to 9 The invention describes a battery cell cover plate connection assembly and a battery cell according to some embodiments of the present application.

[0039] Embodiment 1

[0040] See also Figures 1 to 7 As shown, an embodiment of the present application provides a battery cell cover plate connection assembly, comprising: a cover plate 1, a lower plastic part 3, a pole 2 and a connecting piece 4; wherein the lower plastic part 3 is installed on the inner side of the cover plate 1; the connecting piece 4 is installed on the side of the lower plastic part 3 facing away from the cover plate 1, and is connected by a buckle 5; the pole 2 is installed on the cover plate 1 and the lower plastic part 3, and the pole 2 passes through the lower plastic part 3 to be connected to the connecting piece 4.

[0041] According to the structure described above, it can be known that in the battery cover connection assembly provided by the present application, the connecting piece 4 is fixed to the lower plastic part 3 by the buckle 5, so that the connecting piece 4 is positioned. There is no offset of the connecting piece 4 relative to the cover structure. After welding is completed, the core package will not be offset, which is convenient for entering the shell, and the shell will not be deformed during subsequent use. In addition, since the connecting piece 4 is fixed on the cover structure, it will not be lifted up by the pole ear of the core package, making the welding operation easier to perform, thereby improving production efficiency and welding yield.

[0042] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the buckle 5 is formed on the side of the lower plastic part 3 facing away from the cover plate 1 .

[0043] According to the structure described above, it can be known that molding the buckle 5 structure on the lower plastic part 3 is easier to operate and does not damage the connecting piece 4.

[0044] It should be noted that: the buckle 5 is not limited to being arranged on the lower plastic part 3 as mentioned above, and the buckle 5 can also be arranged on the connecting piece 4, etc., and the specific design is based on actual needs.

[0045] In this embodiment, preferably, Figure 1 and Figure 2 As shown, buckles 5 , namely first buckles 51 , are provided on both sides of the connecting piece 4 along the width direction of the cover plate 1 to limit the two sides of the connecting piece 4 along the width direction of the cover plate 1 .

[0046] According to the structure described above, it can be known that the first buckle 51 is provided on both sides of the connecting piece 4, thereby forming a limit on both sides of the connecting piece 4 along the width direction of the cover plate 1, further ensuring that the connecting piece 4 will not shift or especially deflect along the width direction of the cover plate 1, and the first buckle 51 can also limit the connecting piece 4 in the vertical direction, thereby improving the limiting effect.

[0047] It should be noted that: the first buckle 51 is not limited to being provided on both sides of the connecting piece 4 as mentioned above, and other structures can also be adopted. For example, along the width direction of the cover plate 1, the first buckle 51 is only provided on one side of the connecting piece 4, that is, on a single side, which can also achieve a certain limiting effect.

[0048] In this embodiment, preferably, Figure 1 and Figure 2 As shown, along the length direction of the cover plate 1 , an opening 41 is formed at one end of the connecting piece 4 away from the edge of the lower plastic part 3 , and at least one of the two opposite inner side walls of the opening 41 is provided with a first buckle 51 .

[0049] According to the structure described above, the opening 41 is designed at one end of the connecting piece 4, on the one hand, to assemble with the two side-by-side core package tab clusters along the width direction of the cover plate 1, and on the other hand, to help reduce materials, and at the same time, it can also play a role in avoiding other structures on the cover plate structure. In addition, when welding the connecting piece 4 and the tab of the core package, it is necessary to use a tool, and a part of the structure of the tool is pressed on the structure on both sides of the opening 41 of the connecting piece 4, so that the first buckle 51 is set in this opening 41, so that the buckle 5 avoids the aforementioned tool, that is, avoids lifting the tool, thereby ensuring the welding accuracy.

[0050] Further, preferably, the two opposite inner side walls of the opening 41 are both provided with first buckles 51, that is, the two first buckles 51 are respectively engaged with the two opposite inner side walls of the opening 41, thereby playing a better role in limiting. Of course, it is not limited to this, and only one of the two opposite inner side walls of the opening 41 may be provided with the first buckle 51, which is specifically designed according to actual needs. In addition, the position of the first buckle 51 is not limited to being in the opening 41, but may also be located along the width direction of the cover plate 1, at the outer side of the entire connecting piece 4, and the first buckle 51 may be provided only at one outer side of the entire connecting piece 4, or at both outer sides of the entire connecting piece 4, which is specifically designed according to actual needs.

[0051] It should be noted that the structure of the connecting sheet 4 is not limited to the above, and the connecting sheet 4 may not have the aforementioned opening 41, that is, it is a complete sheet structure, which is designed according to actual needs. In addition, it is not limited to the structure in which two core packages in the present embodiment are equipped with the same connecting sheet 4, but it can also be a single core package structure. In this case, the size of the connecting sheet 4 will be approximately reduced and only corresponds to a single core package. The corresponding relationship between the number of core packages and the connecting sheet 4 is designed according to actual needs.

[0052] In this embodiment, preferably, Figure 7 As shown, the first buckle 51 includes a supporting portion 53, a pressing portion 54 and a holding portion 55 which are connected in sequence; wherein, one end of the supporting portion 53 is connected to the lower plastic part 3, and the pressing portion 54 is arranged at the other end of the supporting portion 53; the holding portion 55 is connected to the pressing portion 54 and is used for the operator to hold, and the operator can open the pressing portion 54 by prying the holding portion 55.

[0053] According to the structure described above, the supporting portion 53 mainly supports the pressing portion 54, and the pressing portion 54 mainly presses the connecting piece 4. The holding portion 55 is convenient for the operator to hold, and by bending the holding portion 55, the pressing portion 54 is opened, which makes it easier to install the connecting piece 4, thereby improving the convenience of assembly.

[0054] It should be noted that the structure of the first buckle 51 is not limited to this, and other forms of buckles 5 may also be used, for example, it only includes a supporting portion 53 and a pressing portion 54, etc., and the specific selection is based on actual needs.

[0055] In this embodiment, preferably, Figure 1 and Figure 2 As shown, along the length direction of the cover plate 1 , a mounting protrusion 31 is formed at one end of the lower plastic part 3 , and a buckle 5 , ie, a second buckle 52 , is formed on one side of the mounting protrusion 31 close to the connecting piece 4 .

[0056] According to the structure described above, it can be known that the second clip 52 cooperates with the first clip 51 to limit the connecting piece 4 in the horizontal direction, and the first clip 51 and the second clip 52 can also limit the connecting piece 4 in the vertical direction. In addition, the second clip 52 is set on the side wall of the mounting protrusion 31 on the original lower plastic part 3, which improves the strength of the second clip 52 and has a better effect of fixing and limiting the connecting piece 4, making it less likely to shift along the length direction of the cover plate 1, and helps to save space. Moreover, the second clip 52 is only provided at one end of the connecting piece 4 close to the mounting protrusion 31, and the other end is not provided with a clip 5 to avoid damaging the pole ear.

[0057] Further, preferably, the second buckle 52 may only include the aforementioned supporting portion 53 and pressing portion 54, one end of the supporting portion 53 is connected to the lower plastic part 3, and the pressing portion 54 is arranged at the other end of the supporting portion 53, and a receiving space is formed between the pressing portion 54 and the lower plastic part 3 for placing the connecting piece 4. When installing the connecting piece 4, the connecting piece 4 can be pushed directly into the opening 41 of the second buckle 52, that is, the aforementioned receiving space, and the end of the connecting piece 4 is clamped in the second buckle 52, and then the first buckle 51 can be opened and clamped on the side of the connecting piece 4, so the second buckle 52 is not equipped with a gripping portion 55, and especially it is formed on the side wall of the mounting protrusion 31, and it does not have enough space for hand holding, so this second buckle 52 is not equipped with a gripping portion 55. Of course, the structure of the second buckle 52 is not limited to the above, and it may also be other forms of buckle 5 structures, for example, it may also be the same as the structure of the first buckle 51, etc., and the specific design is based on actual needs.

[0058] It should be noted that the second buckle 52 is not limited to being provided on the side wall of the mounting protrusion 31, but can also be provided on the surface of the lower plastic part 3 away from the cover plate 1, and the specific design is based on actual needs. In addition, the buckle 5 is not limited to being provided at only one end of the connecting piece 4 along the length direction of the cover plate 1, but can also be provided at both ends of the connecting piece 4, and the specific design is based on actual needs.

[0059] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the buckle 5 and the lower plastic part 3 are an integrated structure, that is, the first buckle 51, the second buckle 52 and the lower plastic part 3 are an integrated structure, which has high overall strength, is not easy to be damaged, and is easy to mold. Of course, it is not limited to this.

[0060] In this embodiment, preferably, Figure 5 and Fig. 9 As shown, the connecting piece 4 is formed with a groove 42 , and one end of the pole 2 is installed in the groove 42 .

[0061] According to the structure described above, the connecting piece 4 is limited in both horizontal and vertical directions, and the welding tool only needs to provide a small pressure in the vertical direction to ensure the welding effect, and also play a certain protective role on the tabs of the core package.

[0062] Of course, it is not limited to the above, and the groove 42 may not be provided, and the pole 2 may be directly placed on the surface of the connecting piece 4.

[0063] Further, preferably, an embossing 43, that is, an indentation, is formed on the connecting sheet 4 to avoid reflection during welding, which belongs to the prior art and will not be described in detail here.

[0064] In this embodiment, preferably, Figure 5 and Figure 8 As shown, the cell cover plate connection assembly further includes a heat insulation film 6 , and the heat insulation film 6 is installed between the connection sheet 4 and the lower plastic part 3 .

[0065] According to the structure described above, the heat insulation film 6 blocks the conduction of heat from the welding point to the lower plastic part 3, so that the hot melting condition of the lower plastic part 3 is improved.

[0066] Further, preferably, the thermal insulation film 6 is formed with a via hole for the pole 2 to pass through.

[0067] In this embodiment, preferably, the heat insulation film 6 is bonded to the lower plastic part 3 or the connecting sheet 4 .

[0068] According to the structure described above, it can be known that the heat insulation film 6 can be pre-pasted on the surface of the lower plastic part 3, and can also be pre-pasted on the surface of the connecting piece 4, which is simple and convenient to operate.

[0069] Further, preferably, the material of the thermal insulation film 6 is thermoplastic polyester PET, but it is not limited thereto and can be designed according to actual needs.

[0070] It should be noted that: the present invention is not limited to the structure in which the first buckle 51 and the second buckle 52 coexist. Alternatively, only the first buckle 51 or only the second buckle 52 may be provided, depending on actual needs.

[0071] In addition, in the present embodiment, the battery cover connection assembly includes two poles 2, one of which is a positive pole and the other is a negative pole, and correspondingly, two connecting plates 4 are provided. Of course, not limited to this, the battery cover connection assembly may also include only one pole 2, which is a positive pole or a negative pole, and only needs to be provided with one connecting plate 4, and the specific design is based on actual needs.

[0072] Embodiment 2

[0073] Embodiment 2 of the present application further provides a battery cell, comprising the battery cell cover plate connection assembly described in the above embodiment 1, and thus has all the beneficial technical effects of the battery cell cover plate connection assembly, and the same technical features and beneficial effects are not repeated.

[0074] In this embodiment, preferably, the battery cell also includes a shell and a core pack; wherein the core pack is installed in the shell, the battery cell cover plate connecting assembly is installed at the opening 41 of the shell, and the connecting piece 4 of the battery cell cover plate 1 assembly is welded together with the pole ear of the core pack.

[0075] It should be noted that the number of core packages can be one, two, or even two, depending on actual needs.

[0076] In addition, the shell may have only one end opening 41, and one end is equipped with the aforementioned battery cover plate connection assembly, and the battery cover plate connection assembly includes two poles 2, one is a positive pole and the other is a negative pole, and is equipped with two connecting pieces 4, the positive ear cluster of the core package is connected to the positive pole 2 through the connecting piece 4, and the negative ear cluster of the core package is connected to the negative pole 2 through the connecting piece 4; the shell can also be set to a structure with two ends opening 41, and both ends opening 41 are equipped with the aforementioned battery cover plate connection assembly, and the battery cover plate connection assembly includes a pole 2 and a connecting piece 4, or one end opening 41 of the shell is equipped with the aforementioned battery cover plate connection assembly, and the battery cover plate connection assembly includes a pole 2 and a connecting piece 4, and the other end opening 41 of the shell is equipped with a common cover plate structure and connecting piece 4 in the prior art. Of course, it is not limited to this, and it is just a few examples.

[0077] 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 battery cover plate connection assembly, characterized in that: include: A cover plate, a lower plastic part, a pole and a connecting piece; wherein the lower plastic part is installed on the inner side of the cover plate; The connecting piece is installed on a side of the lower plastic part away from the cover plate and is connected by snaps; the pole is installed on the cover plate and the lower plastic part, and the pole passes through the lower plastic part to be connected to the connecting piece.

2. The battery cover plate connection assembly according to claim 1, characterized in that: The buckle is formed on a side of the lower plastic part facing away from the cover plate.

3. The battery cover plate connection assembly according to claim 1, characterized in that: The buckle is provided on at least one side of the connecting piece along the width direction of the cover plate to limit at least one side of the connecting piece along the width direction of the cover plate.

4. The cell cover plate connection assembly according to claim 3, characterized in that: The buckles are arranged on both sides of the connecting piece along the width direction of the cover plate.

5. The cell cover plate connection assembly according to claim 3, characterized in that: An opening is formed at one end of the connecting piece away from the edge of the lower plastic part along the length direction of the cover plate, and at least one of the two opposite inner side walls of the opening is provided with the buckle.

6. The battery cover plate connection assembly according to claim 1, characterized in that: Along the length direction of the cover plate, at least one side of the connecting piece is provided with the buckle to limit at least one side of the connecting piece along the length direction of the cover plate.

7. The battery cover plate connection assembly according to claim 6, characterized in that: A mounting protrusion is formed at one end of the lower plastic part along the length direction of the cover plate, and the buckle is formed on one side of the mounting protrusion close to the connecting piece.

8. The battery cover plate connection assembly according to claim 1, characterized in that: At least part of the buckle includes a supporting portion, a pressing portion and a holding portion connected in sequence; wherein one end of the supporting portion is connected to the lower plastic part, the pressing portion is arranged at the other end of the supporting portion, and a receiving space for receiving the connecting piece is formed between the pressing portion and the lower plastic part; the holding portion is connected to the pressing portion and is used for the operator to hold, and the operator can open the pressing portion by prying the holding portion; and / or The connecting piece is formed with a groove, and one end of the pole is installed in the groove; and / or The buckle and the lower plastic part are an integrated structure.

9. The battery cell cover plate connection assembly according to any one of claims 1 to 8, characterized in that: The cell cover plate connection assembly further includes a heat insulation film, and the heat insulation film is installed between the connection sheet and the lower plastic part.

10. The battery cover plate connection assembly according to claim 9, characterized in that: The heat insulation film is bonded to the lower plastic part or the connecting sheet.

11. A battery cell, characterized in that: It comprises a shell, a core pack and a battery cell cover plate connecting assembly as described in any one of claims 1 to 10; wherein the core pack is installed in the shell, the battery cell cover plate connecting assembly is installed at the opening of the shell, and the connecting piece of the battery cell cover plate assembly is welded together with the pole ear of the core pack.

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