Cover plate assembly and battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a cover plate assembly and a battery, which comprises a cover plate, a pole and an insulating glue layer, the cover plate comprises a bottom plate and a sealing plate, a groove which is sunken towards a first direction is formed in the middle of the bottom plate, and a top opening and a bottom opening are formed in the two sides, in the first direction, of the groove respectively; the insulating rubber layer is annular, the insulating rubber layer is provided with a containing groove with an opening facing the radial inner side of the insulating rubber layer, the pole comprises a columnar main body and an annular plate, and the annular plate is connected to the outer peripheral surface of the columnar main body and protrudes out of the outer peripheral surface of the columnar main body in the radial direction away from the columnar main body; the pole is accommodated in the groove, and the annular plate is embedded in the accommodating groove; the sealing plate is fixed in the top opening, and along the first direction, the insulating glue layer is pressed between the sealing plate and the bottom wall of the groove. The sealing structure has the advantage that the sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field especially relates to a cover plate subassembly and battery. BACKGROUND

[0002] The cover plate subassembly of the button cell includes a pole, a cover plate and an insulating adhesive layer, the insulating adhesive layer is arranged between the cover plate and the pole, and is used for insulating the cover plate and the pole.

[0003] However, the cover plate subassembly is often insufficient in contact area between the insulating adhesive layer and the cover plate or the pole after hot pressing, leading to poor sealing performance of the cover plate, and thus causing sealing failure, battery leakage and normal use of the battery. SUMMARY

[0004] The utility model wants to solve the technical problem: in view of the problem that the cover plate subassembly is insufficient in contact area between the insulating adhesive layer and the cover plate or the pole after hot pressing, leading to poor sealing performance of the cover plate, provide a cover plate subassembly and battery.

[0005] To solve the above technical problem, on the one hand, the utility model embodiment provides a cover plate subassembly, including cover plate, pole and insulating adhesive layer, the cover plate includes bottom plate and sealing plate, the middle part of bottom plate is provided with the recess that recesses to the first direction, the both sides of recess along the first direction form top opening and bottom opening respectively,

[0006] The insulating adhesive layer is annular, the insulating adhesive layer has a receiving groove with an opening facing the radial inner side of the insulating adhesive layer, the pole includes a cylindrical body and a ring plate, the ring plate is connected to the outer peripheral surface of the cylindrical body and protrudes from the outer peripheral surface of the cylindrical body in the radial direction away from the cylindrical body, the pole is accommodated in the recess and the ring plate is embedded in the receiving groove,

[0007] The sealing plate is fixed in the top opening, and the insulating adhesive layer is pressed between the sealing plate and the bottom wall of the recess along the first direction; the first direction is parallel to the axial direction of the insulating adhesive layer.

[0008] Optionally, the recess includes a first recess and a second recess arranged in sequence along the first direction, one end of the first recess away from the second recess constitutes the top opening, one end of the second recess away from the first recess constitutes the bottom opening, the groove width of the first recess is greater than the groove width of the second recess, the sealing plate and the bottom wall of the first recess are arranged in a spaced manner, the insulating adhesive layer includes an adhesive layer body and an extension layer, the adhesive layer body is arranged between the sealing plate and the bottom wall of the second recess, the extension layer is arranged between the sealing plate and the bottom wall of the first recess, and the inner wall of the extension layer is connected with the adhesive layer body.

[0009] Optionally, the columnar body comprises a first column and a second column, the first column and the second column are arranged on opposite sides of the ring plate along the first direction, the first column extends into the top opening along the first direction, and an outer peripheral wall of the first column is spaced apart from an inner wall of the top opening; the second column extends into the bottom opening, and an outer peripheral wall of the second column is spaced apart from a side wall of the bottom opening.

[0010] Optionally, a side surface of the ring plate is spaced apart from the sealing plate, another side surface of the ring plate is spaced apart from a bottom wall of the second groove, and a peripheral surface of the ring plate is spaced apart from a side wall of the second groove.

[0011] The glue layer body comprises a first glue layer, a second glue layer and a third glue layer, the first glue layer is arranged between the sealing plate and the ring plate, the second glue layer is arranged between the ring plate and the bottom wall of the second groove, and the third glue layer is arranged between the peripheral wall of the ring plate and the side wall of the second groove, two sides of the third glue layer along the first direction are connected with the first glue layer and the second glue layer respectively, and the first glue layer, the second glue layer and the third glue layer form the containing groove.

[0012] An inner wall of the epitaxial layer is connected with the first glue layer.

[0013] Optionally, the first glue layer, the second glue layer, the third glue layer and the epitaxial layer are integrally formed.

[0014] Optionally, a depth of the first groove along the first direction is 0.2-0.45mm.

[0015] Optionally, a depth of the groove along the first direction is 0.4-0.9mm.

[0016] Optionally, a thickness of the third glue layer along an inner-outer direction of the ring plate in the radial direction is 0.2-0.3mm.

[0017] Optionally, along the inner-outer direction of the ring plate in the radial direction, a depth of the containing groove is greater than 1.2mm.

[0018] In another aspect, the utility model also provides a battery, comprising a lower shell and the above-mentioned cover plate assembly, the lower shell is provided with an inner cavity opening upward, the cover plate is arranged at the opening of the lower shell, and the cover plate and the lower shell form a closed cavity.

[0019] According to the cover plate assembly and the battery provided by the embodiment of the present application, the first glue layer is arranged between the ring plate and the sealing plate, which can achieve insulation and enhance sealing performance, and the second glue layer and the third glue layer can also achieve the effect of insulation and enhance sealing performance. Through the above arrangement, when the water vapor on one side of the cover plate flows to the other side of the cover plate through the top opening and the bottom opening, the water vapor needs to pass through the first glue layer, the third glue layer and the second glue layer, the water vapor flow path is greatly lengthened, and the sealing performance is greatly enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A structural schematic diagram of a cover plate assembly provided by an embodiment of the present application is provided.

[0021] Fig. 2 A partial schematic diagram of a battery provided by an embodiment of the present application is provided.

[0022] The reference signs in the specification are as follows: 1, cover plate; 11, bottom plate; 12, sealing plate; 13, first groove; 14, second groove; 15, top opening; 16, bottom opening; 2, pole; 21, ring plate; 22, first column body; 23, second column body; 3, insulating glue layer; 31, first glue layer; 32, second glue layer; 33, third glue layer; 34, outer extension layer; 4, lower shell. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clear and understandable, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0024] As shown in the drawings, Figs. 1-2 An embodiment of the present application provides a cover plate assembly, which comprises a cover plate 1, a pole 2 and an insulating glue layer 3; the cover plate 1 comprises a bottom plate 11 and a sealing plate 12, the middle part of the bottom plate 11 is provided with a groove recessed in a first direction, the middle part of the bottom plate is recessed towards any one end of the first direction, the groove forms a top opening and a bottom opening on the two sides along the first direction; the insulating glue layer 3 is annular, the insulating glue layer 3 has a receiving groove with an opening towards the radial inner side of the insulating glue layer 3, the pole 2 comprises a columnar main body and a ring plate 21, the ring plate 21 is connected to the outer circumferential surface of the columnar main body and protrudes from the outer circumferential surface of the columnar main body in the radial direction away from the columnar main body, the pole 2 is accommodated in the groove and the ring plate 21 is embedded in the receiving groove; the sealing plate 12 is fixed in the top opening, and the insulating glue layer 3 is tightly pressed between the sealing plate 12 and the bottom wall of the groove along the first direction.

[0025] In this embodiment, the cover plate 1 is a circular plate, the columnar body is a cylinder, the insulating adhesive layer 3 is a circular ring, and the first direction, the axial direction of the insulating adhesive layer 3, the axial direction of the columnar body, and the axial direction of the cover plate 1 are parallel to each other.

[0026] In other embodiments, the cover plate 1 is a square plate, the insulating adhesive layer 3 is a square ring, the columnar body is a square column, and the first direction, the thickness direction of the cover plate 1, the length direction of the columnar body, and the axial direction of the insulating adhesive layer 3 are parallel to each other.

[0027] The groove includes a first groove 13 and a second groove 14 arranged in the first direction in sequence, one end of the first groove 13 and the bottom end of the second groove 14 are communicated, the end of the first groove 13 away from the second groove 14 constitutes a top opening, and the end of the second groove 14 away from the first groove 13 constitutes a bottom opening.

[0028] The cover plate 12 is arranged in the groove, and the cover plate 12 is connected to the bottom plate 11 by welding. The cover plate 12 and the bottom plate 11 can be made of different materials, and are preferably made of the same material.

[0029] The ring plate 21 is arranged in the first groove 13 and / or the second groove 14, that is, the ring plate 21 can be arranged in the first groove 13, the ring plate 21 can also be arranged in the second groove 14, and of course, a part of the ring plate 21 can be arranged in the first groove 13 and another part of the ring plate 21 can be arranged in the second groove 14. The outer edge of the ring plate 21 extends into the interval between the cover plate 12 and the bottom wall of the second groove 14, and the ring plate 21 is arranged in the interval between the cover plate 12, the side wall of the second groove 14, and the bottom wall of the second groove 14, respectively. The cover plate 12 and the bottom wall of the second groove 14 are located on opposite sides of the ring plate 21.

[0030] The insulating layer includes an adhesive layer body and an extension layer. The adhesive layer body is arranged between the cover plate 12 and the bottom wall of the second groove 14, and the extension layer 34 is arranged between the cover plate 12 and the bottom wall of the first groove 13. The inner wall of the extension layer 34 is connected to the adhesive layer body.

[0031] Specifically, the glue layer body includes a first glue layer 31, a second glue layer 32 and a third glue layer 33, the first glue layer 31 is arranged between the cover plate 12 and the ring plate 21, the second glue layer 32 is arranged between the ring plate 21 and the bottom wall of the second groove 14, and the third glue layer 33 is arranged between the outer circumferential wall of the ring plate 21 and the inner wall of the second groove 14, the first glue layer 31 and the second glue layer 32 are parallel and spaced, the third glue layer 33 is arranged between the first glue layer 31 and the second space, and the upper and lower sides of the third glue layer 33 are connected with the first glue layer 31 and the second space respectively, and the inner wall of the outer extension layer 34 is connected with the first glue layer 31; the third glue layer 33, the first glue layer 31 and the second glue layer 32 jointly form a containing groove for embedding the ring plate.

[0032] In the embodiment, the first glue layer 31 is arranged between the ring plate 21 and the cover plate 12, which can play the role of insulation and enhance the sealing performance, the second glue layer 32 is arranged between the ring plate 21 and the bottom wall of the second groove 14, which can also play the role of insulation and enhance the sealing performance, and the third glue layer 33 is arranged between the ring plate 21 and the inner wall of the second groove 14, which can also play the role of insulation and enhance the sealing performance. Through the above arrangement, when the water vapor on one side of the cover plate 1 flows to the other side of the cover plate 1 through the top opening 15 and the bottom opening 16, the water vapor needs to pass through the first glue layer 31, the third glue layer 33 and the second glue layer 32, the water vapor flow path is greatly lengthened, the contact area of the insulating glue layer 3 with the cover plate 1 and the contact area of the insulating glue layer 3 with the pole 2 are increased, and the overall sealing performance of the cover plate assembly is greatly enhanced. The outer circumferential wall of the outer extension layer is connected with the first glue layer.

[0033] As an example, the groove width of the first groove 13 is greater than the groove width of the second groove 14, the cover plate 12 and the bottom wall of the first groove 13 are arranged in a spaced manner, and the insulating glue layer 3 further includes an outer extension layer 34, the outer extension layer 34 is arranged between the cover plate 12 and the bottom wall of the first groove 13, and the inner wall of the outer extension layer 34 is connected with the first glue layer 31.

[0034] Taking the first groove 13 and the second groove 14 as circular grooves and the ring plate 21 as a circular plate as an example, the diameter of the first groove 13 is greater than the diameter of the second groove 14, and the diameter of the second groove 14 is greater than the bottom opening 16, wherein the bottom opening 16 and the top opening 15 are both circular holes, the diameter of the ring plate 21 is greater than the bottom opening 16 and less than the second groove 14, the cover plate 12 and the bottom wall of the first groove 13 are arranged in a facing manner, the first glue layer 31 extends outward to form an outer extension layer 34, the first glue layer 31 and the outer extension layer 34 are integrally formed, and the existence of the outer extension layer 34 can further lengthen the water vapor flow path, thereby enhancing the sealing performance.

[0035] As an example, the columnar body includes a first column 22 arranged on one side of the ring plate 21 along the first direction, the first column 22 extends into the top opening 15 along the first direction, and the outer peripheral wall of the first column 22 is spaced apart from the inner wall of the top opening 15. The columnar body also includes a second column 23 arranged on the opposite side of the ring plate 21 from the first column 22, the second column 23 extends into the bottom opening 16, and the outer peripheral wall of the second column 23 is spaced apart from the side wall of the bottom opening 16.

[0036] In this embodiment, the first column 22 and the second column 23 are both cylindrical, the first column 22, the ring plate 21, and the second column 23 are coaxial, the first column 22 and the second column 23 are arranged on the axial sides of the ring plate 21, the first column 22 is used for electrical connection with the outside, and the second column 23 is used for electrical connection with the internal battery cell. The first column 22 and the second column 23 are mainly used for facilitating the welding of wires, the first column 22 as the connecting end of the ring plate 21 extends into the top opening 15, and the first column 22 is preferably flush with the side opening of the top opening 15 away from the bottom opening 16. Similarly, the second column 23 as the other connecting end of the ring plate 21 extends into the bottom opening 16, and the second column 23 is preferably flush with the side opening of the bottom opening 16 away from the top opening 15.

[0037] As an example, the first column 22, the second column 23, and the ring plate 21 are integrally formed. Similarly, the insulating adhesive layer 3 is also generally integrally formed, that is, the first adhesive layer 31, the second adhesive layer 32, the third adhesive layer 33, and the outer extension layer 34 are integrally formed. The insulating adhesive layer 3 is made of PP adhesive and is bonded to the ring plate 21 and the cover plate 1 by hot pressing.

[0038] As an example, the groove includes a first groove 13 and a second groove 14, the depth of the groove is B, B is 0.4-0.9mm, the depth direction of the first groove 13 and the depth direction of the second groove 14 are the same, both are along the first direction, wherein the depth of the first groove 13 is A, A is 0.2-0.45mm. In this embodiment, the depth of the second groove 14 is the depth of the groove minus the depth of the first groove, that is, the depth of the second groove 14 is the difference between B and A. The thickness of the sealing plate 12 is less than the depth of the first groove 13. The depth of the first groove 13 and the second groove 14 is limited and cannot be too deep, mainly to facilitate the installation of the sealing plate 12 and the ring plate 21. If the depth of the first groove 13 and the second groove 14 is too deep, the position of the ring plate 21 may be too high or too low, causing the first column 22 and the second column 23 to be offset in the up-down direction, which is not suitable for subsequent electrical connection with external equipment and battery cells.

[0039] As an example, the third adhesive layer 33 has a thickness D along the radial direction of the ring plate, and D is 0.2-0.3 mm. In this embodiment, D is 0.2 mm. In this embodiment, the third adhesive layer 33 must have a certain thickness, otherwise the third adhesive layer 33 may be extruded and broken, or the third adhesive layer 33 is not thick enough to insulate the pole 2 and the cover plate 1, so that a short circuit phenomenon occurs between the cover plate 1 and the pole 2.

[0040] As an example, the side surface of the sealing plate 12 is flush with the surface of the cover plate 1. For aesthetic considerations, the upper side surface of the sealing plate 12 is flush with the upper side surface of the cover plate 1.

[0041] As an example, the ring plate 21 extends into the space between the sealing plate 12 and the bottom wall of the second groove 14 along the radial direction of the ring plate 21, that is, along the radial direction of the ring plate 21, and the extension distance is greater than 1.2 mm. In other words, along the radial direction of the ring plate 21, the overlapping distance of the ring plate 21 and the first adhesive layer 31 is equal to the overlapping distance of the ring plate 21 and the second adhesive layer 32. The overlapping distance of the ring plate 21 and the first adhesive layer 31 is defined as C, and C is greater than 1.2 mm, that is, the depth of the accommodating groove is greater than 1.2 mm.

[0042] In an embodiment, the utility model discloses a battery, comprising lower shell 4 and the cover plate assembly of the above.

[0043] The battery of the utility model embodiment has the following assembly process: the flat plate is punched to form the cover plate 1 with the second groove 14 and the first groove 13. The second adhesive layer 32 is placed in the second groove 14, the ring plate 21 is placed on the second adhesive layer 32, the first adhesive layer 31 and the epitaxial layer 34 are placed in the first groove 13, and the sealing plate 12 is placed on the first adhesive layer 31 to complete the preliminary assembly. The parts of the preliminary assembly are heat-pressed by the positioning jig to form the third adhesive layer 33.

[0044] The sealing plate 12 and the bottom plate 11 are welded to form the cover plate assembly. The cover plate assembly, the lower shell 4, the roll core, the electrolyte and the like are prepared. The roll core is placed into the lower shell 4, and the two pole lugs of the roll core are connected with the shell and the cover plate 1 by laser welding, resistance welding, ultrasonic welding and the like. The assembled roll core is baked. The baked roll core is injected with liquid. After the injection is completed, the lower shell 4 and the cover plate assembly are sealed by laser welding to obtain the battery.

[0045] In other embodiments, the first groove 13 and the second groove 14 in the embodiment can be square grooves, and the ring plate 21 can be a square ring plate 21.

[0046] In other embodiments, the first groove 13 and the second groove 14 in the embodiment can be square grooves, and the ring plate 21 can be a square ring plate 21.

[0047] In other embodiments, the first and second posts 22, 23 can be square posts, and the top and bottom openings 15, 16 can be square holes or can be circular holes.

[0048] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall fall within the protection scope of the present application.

Claims

1. A cover plate assembly, characterized in that, It includes a cover plate (1), an electrode post (2), and an insulating adhesive layer (3); the cover plate (1) includes a bottom plate (11) and a sealing plate (12), the bottom plate (11) is provided with a groove recessed in a first direction in the middle, and the groove forms a top opening and a bottom opening on both sides along the first direction, respectively; The insulating adhesive layer (3) is annular and has a receiving groove with an opening facing the radially inner side of the insulating adhesive layer (3). The pole post (2) includes a columnar body and an annular plate (21). The annular plate (21) is connected to the outer peripheral surface of the columnar body and protrudes radially away from the outer peripheral surface of the columnar body. The pole post (2) is received in the groove and the annular plate (21) is embedded in the receiving groove. The sealing plate (12) is fixed in the top opening, and along the first direction, the insulating adhesive layer (3) is pressed between the sealing plate (12) and the bottom wall of the groove; the first direction is the thickness direction of the bottom plate.

2. The cover plate assembly according to claim 1, characterized in that, The groove includes a first groove (13) and a second groove (14) arranged sequentially along a first direction. One end of the first groove (13) and one end of the second groove (14) are connected to each other. The end of the first groove (13) away from the second groove (14) forms a top opening, and the end of the second groove (14) away from the first groove (13) forms a bottom opening. The groove width of the first groove (13) is greater than the groove width of the second groove (14). The sealing plate (12) and the bottom wall of the first groove (13) are spaced apart. The insulating adhesive layer (3) includes an adhesive layer body and an epitaxial layer (34). The adhesive layer body is disposed between the sealing plate (12) and the bottom wall of the second groove (14). The epitaxial layer (34) is disposed between the sealing plate (12) and the bottom wall of the first groove (13). The inner wall of the epitaxial layer (34) is connected to the adhesive layer body.

3. The cover plate assembly according to claim 1, characterized in that, The columnar body includes a first column (22) and a second column (23). The first column (22) and the second column (23) are disposed on opposite sides of the ring plate (21) along the first direction. The first column (22) extends into the top opening along the first direction, and the outer peripheral wall of the first column (22) and the inner wall of the top opening are spaced apart. The second column (23) extends into the bottom opening, and the outer peripheral wall of the second column (23) and the side wall of the bottom opening are spaced apart.

4. The cover plate assembly according to claim 2, characterized in that, One side surface of the ring plate (21) and the sealing plate (12) are spaced apart, the other side surface of the ring plate (21) and the bottom wall of the second groove (14) are spaced apart, and the circumferential surface of the ring plate (21) and the side wall of the second groove (14) are spaced apart. The adhesive layer body includes a first adhesive layer (31), a second adhesive layer (32), and a third adhesive layer (33). The first adhesive layer (31) is disposed between the sealing plate (12) and the ring plate (21). The second adhesive layer (32) is disposed between the ring plate (21) and the bottom wall of the second groove (14). The third adhesive layer (33) is disposed between the outer peripheral wall of the ring plate (21) and the side wall of the second groove (14). The two sides of the third adhesive layer (33) along the first direction are respectively connected to the first adhesive layer (31) and the second adhesive layer (32). The first adhesive layer (31), the second adhesive layer (32), and the third adhesive layer (33) form the receiving groove. The inner wall of the epitaxial layer (34) is connected to the first adhesive layer (31).

5. The cover plate assembly according to claim 4, characterized in that, The first adhesive layer (31), the second adhesive layer (32), the third adhesive layer (33) and the epitaxial layer (34) are integrally formed.

6. The cover plate assembly according to claim 2, characterized in that, The depth of the first groove (13) along the first direction is 0.2-0.45 mm.

7. The cover plate assembly according to claim 2, characterized in that, The depth of the groove along the first direction is 0.4-0.9 mm.

8. The cover plate assembly according to claim 4, characterized in that, The thickness of the third adhesive layer (33) along the radial direction of the ring plate (21) is 0.2-0.3 mm.

9. The cover plate assembly according to claim 1, characterized in that, The depth of the receiving groove is greater than 1.2 mm in the radial direction of the ring plate (21).

10. A battery, characterized in that, The device includes a lower shell (4) and a cover plate assembly as described in any one of claims 1-9; the lower shell (4) is provided with an upward-opening inner cavity, and the cover plate (1) is disposed at the opening of the lower shell (4), the cover plate (1) and the lower shell (4) forming a closed cavity.

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