Battery top cover assembly and square battery

Abstract

The utility model provides a battery top cover assembly and a square battery, and relates to the technical field of batteries, and the battery top cover assembly comprises a cover plate, the lower insulating part is positioned on the bottom surface of the cover plate; the switching piece is arranged on the side, away from the cover plate, of the lower insulating part, the pole comprises a disc body and a pole body fixedly connected with the disc body, the pole body penetrates through the mounting hole, the lower insulating part and the switching piece and enables the switching piece, the lower insulating part and the cover plate to be riveted, and the disc body is located on the top face of the cover plate; the sealing piece comprises a first sealing part and a second sealing part which are connected with each other, the first sealing part is located between the outer wall of the column and the inner wall of the mounting hole, and the second sealing part is located between the disc body and the top surface of the cover plate. According to the battery top cover assembly disclosed by the utility model, the pole is reversely riveted from the bottom surface, a riveting block is omitted, the weight is reduced, the requirement of light weight of the battery is met, and the energy density of the battery is favorably improved. And two welding procedures are omitted, the complexity in the manufacturing process of the battery top cover assembly is reduced, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery top cover subassembly and square battery. BACKGROUND

[0002] The battery top cover subassembly is an important component of the lithium battery, usually including the pole, the top cover sheet, the upper plastic, the lower plastic, the sealing ring and the riveting block. The traditional battery top cover subassembly connects the pole and the top cover sheet through the riveting block, and realizes the sealing through the riveting block compression sealing ring. However, the existing battery top cover subassembly has some problems in the structure design and manufacturing process, which limits the performance improvement and production cost control of the battery.

[0003] Firstly, the use of the riveting block increases the weight of the battery top cover subassembly, and the riveting assembly of the riveting block, the pole and the top cover sheet leads to the increase of the pole height, so that the weight of the pole is increased, which is contrary to the demand of the battery lightweight. The battery lightweight is important for improving the capacity, energy density of the lithium battery and reducing the cost, therefore, this design limits the improvement of the comprehensive performance of the battery. In addition, after the riveting of the riveting block and the pole, the connection needs to be laser welded, which increases the complexity and cost of the production process.

[0004] In the production of the square battery, especially when the pole lug is on both sides of the battery cell, the battery top cover subassembly needs to weld the pole and the adapter sheet first, and then weld the adapter sheet and the battery cell pole lug. There are multiple welding processes in this process, the process is complex, which leads to low production efficiency and high manufacturing cost. Overall, the existing battery top cover subassembly design has a large optimization space in improving the production efficiency, reducing the cost and meeting the lightweight demand. SUMMARY

[0005] Therefore, the utility model provides a battery top cover subassembly and square battery, through the optimization structure design, to meet the demand of the battery top cover subassembly lightweight and low cost.

[0006] The technical scheme of the utility model is realized as follows:

[0007] On the one hand, the utility model provides a battery top cover subassembly, including:

[0008] The cover plate has a mounting hole on the cover plate;

[0009] The lower insulating piece is located on the bottom surface of the cover plate;

[0010] The adapter sheet is arranged on the side of the lower insulating piece away from the cover plate,

[0011] The pole post comprises a disc body and a post body fixedly connected with the disc body, the post body penetrates through the mounting hole, the lower insulating piece and the adapter piece and rivets the adapter piece, the lower insulating piece and the cover plate, and the disc body is located on the top surface of the cover plate.

[0012] The sealing member comprises a first sealing part and a second sealing part connected with each other, the first sealing part is located between the outer wall of the post body and the inner wall of the mounting hole, and the second sealing part is located between the disc body and the top surface of the cover plate.

[0013] On the basis of the above technical scheme, preferably, the upper insulating piece comprises an annular plate body, the outer diameter of the second sealing part is smaller than the outer diameter of the disc body, the annular plate body is sleeved on the outside of the second sealing part and located between the disc body and the top surface of the cover plate.

[0014] On the basis of the above technical scheme, preferably, the upper insulating piece further comprises a cylindrical plate body, the cylindrical plate body is fixedly arranged at the edge of the annular plate body, and the inner diameter of the cylindrical plate body is matched with the outer diameter of the disc body.

[0015] On the basis of the above technical scheme, preferably, the top surface of the cover plate is provided with a mounting groove coaxial with the mounting hole, the inner diameter of the mounting groove is matched with the outer diameter of the annular plate body, and the annular plate body and the second sealing part are accommodated in the mounting groove.

[0016] On the basis of the above technical scheme, preferably, the thickness of the second sealing part is greater than the thickness of the annular plate body.

[0017] On the basis of the above technical scheme, preferably, the end of the post body away from the disc body has a stepped post, the diameter of the stepped post is smaller than the diameter of the post body, the length of the post body is smaller than the total thickness of the annular plate body, the cover plate and the lower insulating piece, the stepped post penetrates through the adapter piece and is riveted with the surface of the adapter piece away from the lower insulating piece.

[0018] On the basis of the above technical scheme, preferably, the end surface of the stepped post has a riveting groove.

[0019] On the basis of the above technical scheme, preferably, the adapter piece comprises a first piece body and a second piece body connected vertically, the first piece body is riveted with the post body, and the second piece body is used for being connected with the pole lug.

[0020] On the basis of the above technical scheme, preferably, the first piece body and the lower insulating piece are provided with a positioning column and a positioning hole matched with each other.

[0021] In a second aspect, the utility model provides a square battery, comprising the battery top cover subassembly of first aspect.

[0022] The utility model discloses relative to prior art has following beneficial effect:

[0023] (1) relative to the positive pole post top surface in prior art carries out the positive riveting mode, the utility model discloses the positive pole post by bottom surface carries out the reverse riveting, and the disc body and the cover plate are sealed through the second sealing portion, cancel riveting block, reduce the weight, also reduced the height of whole positive pole post, meet the requirement of battery light weight, help to improve the energy density of battery.In addition, the first welding procedure of riveting block and positive pole post connecting place is saved, and the adapter sheet, lower insulating piece and cover plate are riveted together through the positive pole post, the second welding procedure of positive pole post and adapter sheet is saved, reduces the complexity in the manufacturing process of battery top cover assembly, and reduces the cost.

[0024] (2) through setting the upper insulating piece, the annular plate body and the disc body and the cover plate top surface form a stable structure interface, further enhance the insulation performance of battery top cover assembly, provide additional electrical isolation, prevent possible short circuit phenomenon, through the setting of the cylindrical plate body, the outer periphery of the disc body can be wrapped, form an additional insulating layer, can further enhance the electrical isolation between the positive pole post and the cover plate, avoid the safety problem caused by current leakage or short circuit.

[0025] (3) through setting the mounting groove, the upper insulating piece and the second sealing portion can be embedded therein, and the embedded setting can avoid the displacement of the upper insulating piece and the sealing element under the action of external force, improve the stability and reliability of the overall structure.Meanwhile, the setting of the mounting groove makes the annular plate body, the second sealing portion and the disc body more fit, forms a sealing interface with better sealing, further reduces the risk of electrolyte leakage. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0027] Figure 1 It is the three-dimensional structure schematic diagram of battery top cover assembly disclosed by the utility model;

[0028] Figure 2 It is the first perspective view exploded schematic diagram of battery top cover assembly disclosed by the utility model;

[0029] Figure 3 It is the second perspective view exploded schematic diagram of battery top cover assembly disclosed by the utility model;

[0030] Figure 4The utility model discloses a top view of battery top cover assembly of the utility model discloses a battery top cover assembly.

[0031] Figure 5 For Figure 4 Middle A-A plane view;

[0032] Reference signs:

[0033] 1, cover plate, 11, mounting hole, 2, lower insulating part, 3, adapter piece, 4, pole, 41, disc body, 42, column body, 5, sealing element, 51, first sealing part, 52, second sealing part, 6, upper insulating part, 61, annular plate body, 62, cylindrical plate body, 12, mounting groove, 43, stepped column, 431, riveting groove, 31, first piece body, 32, second piece body, D1, positioning column, D2, positioning hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] As Figure 1 shown, in conjunction with Figures 2-5 The utility model discloses a kind of battery top cover assemblies, including cover plate 1, lower insulating part 2, adapter piece 3, pole 4 and sealing element 5.

[0036] Among them, cover plate 1 has mounting hole 11, to realize the installation of pole 4 on cover plate 1.

[0037] Lower insulating part 2, located cover plate 1 bottom surface, for making core package and cover plate 1 keep electrically isolated, in this embodiment, lower insulating part 2 is hard plastic material.

[0038] Adapter piece 3, setting in lower insulating part 2 side away from cover plate 1, for establishing electrically connected between pole 4 and tab.

[0039] Pole 4, including disc body 41 and the column body 42 fixedly connected with disc body 41, column body 42 passes through mounting hole 11, lower insulating part 2 and adapter piece 3 and rivets adapter piece 3, lower insulating part 2 and cover plate 1, disc body 41 is located cover plate 1 top surface, this structure sets up, so that column body 42 in the bottom surface of cover plate 1 through riveting to firmly assemble pole 4, cover plate 1, lower insulating part 2 and adapter piece 3 together.

[0040] In order to realize the sealing between the pole 4 and the cover plate 1, the sealing element 5 of the embodiment comprises a first sealing part 51 and a second sealing part 52 connected with each other, the first sealing part 51 is located between the outer wall of the pole 42 and the inner wall of the mounting hole 11, and is used for sealing between the pole 42 and the mounting hole 11, and the second sealing part 52 is located between the disc body 41 and the top surface of the cover plate 1, and is used for forming a sealing between the disc body 41 and the cover plate 1, so as to ensure that the electrolyte cannot leak through the above-mentioned connection.

[0041] Compared with the forward riveting mode of the top surface of the pole 4 in the prior art, the pole 4 of the embodiment is reversely riveted by the bottom surface, the disc body 41 and the cover plate 1 are sealed by the second sealing part 52, the riveting block is cancelled, the weight is reduced, and the height of the whole pole 4 is also reduced, which meets the requirement of lightening of the battery and helps to improve the energy density of the battery. In addition, the first welding process at the connection between the riveting block and the pole 4 is omitted, the pole 4 is riveted together with the adapter sheet 3, the lower insulating element 2 and the cover plate 1, the second welding process of the pole 4 and the adapter sheet 3 is omitted, the complexity in the manufacturing process of the battery top cover assembly is reduced, and the cost is reduced.

[0042] In the riveting process of the pole 4, the disc body 41 approaches the cover plate 1, and the second sealing part 52 is compressed. When the compression amount is too large, there is a risk of short circuit between the disc body 41 and the cover plate 1.

[0043] Therefore, the embodiment also provides an upper insulating element 6. The upper insulating element 6 comprises an annular plate body 61, the outer diameter of the second sealing part 52 is smaller than the outer diameter of the disc body 41, the annular plate body 61 is sleeved outside the second sealing part 52, and is located between the disc body 41 and the top surface of the cover plate 1, so as to ensure that the annular plate body 61 forms a stable structural interface with the disc body 41 and the top surface of the cover plate 1, further enhances the insulation performance of the battery top cover assembly, provides additional electrical isolation, and prevents possible short circuit.

[0044] On the basis of the above technical scheme, the upper insulating element 6 further comprises a cylindrical plate body 62, the cylindrical plate body 62 is fixedly arranged at the edge of the annular plate body 61, and the inner diameter of the cylindrical plate body 62 is matched with the outer diameter of the disc body 41. Through the arrangement of the cylindrical plate body 62, the outer periphery of the disc body 41 can be wrapped, and an additional insulation layer is formed, which can further enhance the electrical isolation between the pole 4 and the cover plate 1, and avoid safety problems caused by current leakage or short circuit.

[0045] In addition, the cylindrical plate body 62 is closely attached to the outer wall of the disc body 41, and forms an annular sealing interface, which is complementary to the function of the second sealing part 52, and further reduces the risk of electrolyte leakage.

[0046] As a preferred embodiment, the top surface of the cover plate 1 is provided with a mounting groove 12 coaxial with the mounting hole 11, the inner diameter of the mounting groove 12 is matched with the outer diameter of the annular plate body 61, and the annular plate body 61 and the second sealing part 52 are accommodated in the mounting groove 12. By arranging the mounting groove 12, the upper insulation part 6 and the second sealing part 52 can be embedded in the mounting groove 12, and the embedded arrangement can avoid displacement of the upper insulation part 6 and the sealing part 5 under external force, thereby improving the stability and reliability of the overall structure. Meanwhile, the arrangement of the mounting groove 12 makes the annular plate body 61, the second sealing part 52 and the disc body 41 more closely connected, thereby forming a sealing interface with better sealing performance and further reducing the risk of electrolyte leakage.

[0047] As some preferred embodiments, the thickness of the second sealing part 52 is greater than the thickness of the annular plate body 61. In this way, when the riveting of the pole 4 is performed, the disc body 41 extrudes the second sealing part 52, the second sealing part 52 is axially compressed, the second sealing part 52 has a large compression amount, thereby forming a strong seal between the disc body 41 and the top surface of the cover plate 1. When the second sealing part 52 is compressed to a certain amount, the disc body 41 is in contact with the annular plate body 61, the second sealing part 52 is not compressed, and damage of the second sealing part 52 due to excessive compression can be avoided. Meanwhile, the second sealing part 52 is also radially compressed when it is axially compressed, thereby achieving effective sealing with the annular plate body 61 and avoiding leakage of electrolyte.

[0048] In order to realize the riveting of the pole body 42, the embodiment has a stepped pole 43 at the end of the pole body 42 away from the disc body 41, the diameter of the stepped pole 43 is smaller than the diameter of the pole body 42, the length of the pole body 42 is smaller than the total thickness of the annular plate body 61, the cover plate 1 and the lower insulation part 2, and the stepped pole 43 penetrates through the adapter sheet 3 and is riveted to the surface of the adapter sheet 3 away from the lower insulation part 2. By using the above structure, when the stepped pole 43 sequentially penetrates through the mounting hole 11, the lower insulation part 2 and the adapter sheet 3 from the top surface of the cover plate 1, riveting is performed through the stepped pole 43. Under the action of the riveting force, the stepped pole 43 extends to the surrounding, thereby riveting and pressing the bottom surface of the adapter sheet 3. Since the length of the pole body 42 is 0.1-0.2mm smaller than the total thickness of the annular plate body 61, the cover plate 1 and the lower insulation part 2, the end surface of the pole body 42 can be prevented from protruding from the bottom surface of the adapter sheet 3, thereby ensuring that the stepped pole 43 can be effectively riveted and pressed on the bottom surface of the adapter sheet 3.

[0049] In the embodiment, the end surface of the stepped pole 43 is provided with a riveting groove 431, thereby facilitating insertion of a riveting tool into the riveting groove 431 and realizing riveting operation.

[0050] In the embodiment, the adapter sheet 3 includes a first sheet body 31 and a second sheet body 32 connected perpendicularly, the first sheet body 31 is riveted to the pole body 42, and the second sheet body 32 is used to be connected to the tab.

[0051] The positioning column D1 and the positioning hole D2 are provided in the first sheet 31 and the lower insulating part 2, and the first sheet 31 and the lower insulating part 2 are positioned, and then the first sheet 31 and the pole 4 are riveted, so that the adapter sheet 3 is prevented from rotating relative to the lower insulating part 2.

[0052] The embodiment also discloses a square battery comprising the battery top cover assembly disclosed in the above embodiment. The riveting block of the battery cover plate 1 assembly is cancelled, the weight is reduced, the height of the whole pole 4 is reduced, the light weight requirement of the battery is met, and the energy density of the battery is improved. In addition, the first welding process at the connection between the riveting block and the pole 4 is omitted, the adapter sheet 3, the lower insulating part 2 and the cover plate 1 are riveted through the pole 4, the second welding process of the pole 4 and the adapter sheet 3 is omitted, the complexity in the battery manufacturing process is reduced, and the cost is reduced.

[0053] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery top cover assembly, characterized in that, include: Cover plate (1), the cover plate (1) having mounting holes (11); The lower insulating element (2) is located on the bottom surface of the cover plate (1); The adapter piece (3) is disposed on the side of the lower insulating member (2) away from the cover plate (1). The pole post (4) includes a disc body (41) and a column (42) fixedly connected to the disc body (41). The column (42) passes through the mounting hole (11), the lower insulating member (2) and the adapter plate (3) and rivets the adapter plate (3), the lower insulating member (2) and the cover plate (1). The disc body (41) is located on the top surface of the cover plate (1). The sealing element (5) includes a first sealing part (51) and a second sealing part (52) connected to each other. The first sealing part (51) is located between the outer wall of the column (42) and the inner wall of the mounting hole (11), and the second sealing part (52) is located between the disc (41) and the top surface of the cover plate (1).

2. The battery top cover assembly as described in claim 1, characterized in that: It also includes an upper insulating member (6), which includes an annular plate (61). The outer diameter of the second sealing part (52) is smaller than the outer diameter of the disc (41). The annular plate (61) is sleeved on the outside of the second sealing part (52) and is located between the disc (41) and the top surface of the cover plate (1).

3. The battery top cover assembly as described in claim 2, characterized in that: The upper insulating member (6) also includes a cylindrical plate (62), which is fixedly disposed at the edge of the annular plate (61), and the inner diameter of the cylindrical plate (62) is adapted to the outer diameter of the disc (41).

4. The battery top cover assembly as described in claim 2 or 3, characterized in that: The top surface of the cover plate (1) is provided with a mounting groove (12) coaxial with the mounting hole (11). The inner diameter of the mounting groove (12) is adapted to the outer diameter of the annular plate (61). The annular plate (61) and the second sealing part (52) are accommodated in the mounting groove (12).

5. The battery top cover assembly as described in claim 2, characterized in that: The thickness of the second sealing part (52) is greater than the thickness of the annular plate (61).

6. The battery top cover assembly as described in claim 5, characterized in that: The column (42) has a stepped column (43) at one end away from the disc (41). The diameter of the stepped column (43) is smaller than the diameter of the column (42). The length of the column (42) is smaller than the total thickness of the annular plate (61), the cover plate (1), and the lower insulating member (2). The stepped column (43) passes through the adapter piece (3) and is riveted to the side of the adapter piece (3) away from the lower insulating member (2).

7. The battery top cover assembly as described in claim 6, characterized in that: The end face of the stepped column (43) has a riveting groove (431).

8. The battery top cover assembly as claimed in claim 1, characterized in that: The adapter piece (3) includes a first piece (31) and a second piece (32) connected vertically. The first piece (31) and the column (42) are riveted together, and the second piece (32) is used to connect with the electrode tab.

9. The battery top cover assembly as claimed in claim 8, characterized in that: A positioning post (D1) and a positioning hole (D2) are provided between the first sheet (31) and the lower insulating member (2) to cooperate with each other.

10. A square battery, characterized in that, Includes the battery top cover assembly as described in any one of claims 1 to 9.

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