CN217903351U

CN217903351U - Cap assembly, battery and electronic equipment

Info

Publication number: CN217903351U
Application number: CN202221482251.4U
Authority: CN
Inventors: 陈志勇
Original assignee: Jiangxi Weidian New Energy Co Ltd
Current assignee: Jiangxi Weidian New Energy Co Ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-11-25
Anticipated expiration: 2032-06-13

Abstract

The utility model provides a block subassembly, battery and electronic equipment. The cap assembly includes: the cap comprises a top part, a bottom part and a side part, two ends of the side part are respectively connected with the top part and the bottom part, a pressure relief hole is formed in the side part of the cap, and the pressure relief hole extends to the top part; the aluminum bowl, the block lid is established on the aluminum bowl, the aluminum bowl has bound portion, the portion parcel of borduring bottom, bound portion with the bottom welding forms the welding position.

Description

Cap assembly, battery and electronic equipment

Technical Field

The embodiment of the utility model provides a relate to battery technology field, more specifically, the embodiment of the utility model relates to a block subassembly, battery and electronic equipment.

Background

With the continuous consumption of non-renewable resources and the increasing prominence of environmental problems, new energy batteries have been developed rapidly in recent years. A cylindrical battery generally includes a casing, a battery core and a battery cap, wherein one end of the casing is open and used for packaging the battery core, and the battery cap closes the opening of the casing and is electrically connected to the battery core to serve as a positive electrode or a negative electrode of the battery.

In the existing cylindrical battery structure, the connection reliability of the battery cap and the aluminum bowl is weak, and the overall structural strength of the cap assembly is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a block subassembly, battery and electronic equipment new technical scheme.

In a first aspect, the present invention provides a cap assembly. The cap assembly includes:

the cap comprises a top part, a bottom part and a side part, two ends of the side part are respectively connected with the top part and the bottom part, a pressure relief hole is formed in the side part of the cap, and the pressure relief hole extends to the top part;

the aluminum bowl, the block lid is established on the aluminum bowl, the aluminum bowl has bound portion, the parcel of bound portion the bottom, bound portion with the upper surface welding of bottom forms the welding position.

Optionally, the arrangement position of the pressure relief hole and the welding position are staggered in the circumferential direction of the cap assembly.

Optionally, at least two pressure relief holes are formed in the circumferential direction of the cap, a preset region is formed between two adjacent pressure relief holes, and the setting position of the welding position corresponds to the position of the preset region.

Optionally, the pressure relief hole is circular or elliptical;

the pressure relief hole is oval, the oval has mutually perpendicular's major axis and minor axis, the major axis is followed the circumferential direction of block extends.

Optionally, the cap has an outer surface facing away from the aluminum bowl, with a nickel coating disposed on the outer surface.

Optionally, the nickel coating has a thickness of 1 μm to 3 μm.

Optionally, the block subassembly still includes the sealing washer, the sealing washer forms the recess, the portion of borduring of aluminium bowl sets up in the recess.

Optionally, the sealing ring is a hot melt.

In a second aspect, a battery is provided. The battery includes a cap assembly as described in the first aspect.

In a second aspect, an electronic device is provided. The battery comprises the battery of the second aspect.

According to the utility model provides a cap subassembly has seted up the pressure release hole on the lateral part of cap, and the pressure release hole extends to the top, sets up the pressure release hole at the lateral part and the top of cap promptly, has avoided setting up the pressure release hole in the bottom of cap for the portion of borduring of aluminium bowl can more cover the bottom of cap, and the upper surface welding of the portion of being convenient for borduring and bottom has promoted the joint strength of aluminium bowl and cap.

Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a schematic diagram of the battery.

Fig. 2 is a first structural schematic diagram of the cap assembly.

Fig. 3 is an enlarged view of the structure at a in fig. 2.

Fig. 4 is a second structural view of the cap assembly.

Fig. 5 is a schematic view of the structure of fig. 4 from one viewing angle.

Description of the reference numerals:

1. capping; 11. a top portion; 12. a side portion; 13. a bottom; 14. a pressure relief vent;

2. an aluminum bowl; 21. an aluminum bowl body; 22. wrapping the edge part; 221. a first hemming portion; 211. a safety valve; 3. welding positions;

4. a housing; 41. a first bending structure; 42. a second bending structure;

5. an electric core; 51. a first tab; 52. a second tab;

6. and (5) sealing rings.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the prior art, the side part and the bottom part of the cap are provided with pressure relief holes, that is, the bottom part is provided with pressure relief holes, and the pressure relief holes extend towards the bottom part. When the aluminum bowl is welded with the bottom of the cap, the aluminum bowl is also welded with the bottom of the cap, and after the arrangement, the arrangement position of the pressure relief hole influences the covering of the edge covering part of the aluminum bowl on the bottom of the cap, namely, the pressure relief hole occupies part of the bottom area of the cover plate, the area of the edge covering part of the aluminum bowl covering the bottom of the cap is reduced, and the connection strength of the aluminum bowl and the cap is reduced during welding; in addition, the pressure relief hole is formed in the bottom of the cover plate, so that the structural strength of the bottom of the cap is reduced, and after the cap and the aluminum bowl are welded together, the structural strength of the cap and the aluminum bowl which are welded together is reduced.

Based on the above problem, the embodiment of the utility model provides a first aspect provides a block subassembly to the weak technical problem of joint strength of block 1 and aluminium bowl 2 among the solution prior art.

Referring to fig. 1 to 5, the cap assembly includes: a cap 1 and an aluminum bowl 2.

The cap 1 comprises a top portion 11, a bottom portion 13 and a side portion 12, two ends of the side portion 12 are respectively connected with the top portion 11 and the bottom portion 13, a pressure relief hole 14 is formed in the side portion 12 of the cap 1, and the pressure relief hole 14 extends to the top portion 11.

The cover cap 1 covers the aluminum bowl 2, the aluminum bowl 2 is provided with a wrapping portion 22, the wrapping portion 22 wraps the bottom portion 13, and the wrapping portion 22 and the upper surface of the bottom portion 13 are welded to form a welding position 3.

In other words, the cap assembly mainly comprises a cap 1 and an aluminum bowl 2. The cap 1 can be made of a hard steel sheet, and the aluminum bowl 2 can be made of a light aluminum sheet. Wherein aluminium bowl 2 and block 1 welding are in the same place, and when block subassembly application to the battery, wherein a utmost point ear and the aluminium bowl 2 electricity of electricity core 5 are connected, block 1 has drawn forth the electric current as an electrode of battery. For example, the material of the aluminum bowl 2 is AL-1060 material, and the thickness of the aluminum bowl 2 is 0.3mm. For example, the material of the cap 1 is SPCC, and the thickness of the cap 1 may be 0.4mm.

In this embodiment, the cap 1 comprises a top portion 11, a bottom portion 13 and a side portion 12, wherein the top portion 11 and the bottom portion 13 are connected by the side portion 12. For example, the top 11, bottom 13 and sides 12 may be integrally formed to form the cap 1. The cap 1 may be formed by, for example, punching or the like. In a particular embodiment, the cap 1 is similar in construction to a hat.

In this embodiment, the cap 1 is placed on the aluminum bowl 2, and the aluminum bowl 2 and the cap 1 are welded together. Specifically, the aluminum bowl 2 comprises a wrapping part 22, the wrapping part 22 wraps the bottom 13 area of the aluminum bowl 2, and the wrapping part 22 can wrap the bottom 13 area as much as possible. After the edge-covering part 22 covers the bottom part 13 area of the aluminum bowl 2, the edge-covering part 22 is welded with the upper surface of the bottom part 13. For example, the upper surfaces of the brim part 22 and the bottom part 13 are laser welded.

In this embodiment, the connection strength of the aluminum bowl 2 and the cap 1 is improved by changing the arrangement position of the pressure relief hole 14.

Specifically, in the present embodiment, the pressure relief hole 14 is provided in the side portion 12 of the cap 1, and the pressure relief hole 14 extends toward the upper portion of the cap 1, that is, the pressure relief hole 14 is provided in the side portion 12 and the top portion 11 of the cap 1, so that the pressure relief hole 14 is not provided in the bottom portion 13 of the cap 1. After the arrangement, when the edge covering part 22 of the aluminum bowl 2 covers the bottom 13 of the cover plate, the length of the edge covering part 22 in the radial direction of the cover plate can be prolonged, so that the edge covering part 22 can cover more of the bottom 13 of the cover plate and cannot interfere with the arrangement position of the pressure relief hole 14. After the edge-covering part 22 can wrap the bottom part 13 of the cover plate more, the edge-covering part 22 and the bottom part 13 are welded together, and the connecting strength of the edge-covering part 22 and the bottom part 13 is improved.

Therefore, in the embodiment of the present invention, the pressure relief hole 14 is opened on the lateral portion 12 of the cap 1, the pressure relief hole 14 extends to the top portion 11, that is, the pressure relief hole 14 is opened on the lateral portion 12 and the top portion 11 of the cap 1, and the pressure relief hole 14 is prevented from being opened on the bottom portion 13 of the cap 1, so that the edge covering portion 22 of the aluminum bowl 2 can cover more of the bottom portion 13 of the cap 1, which is convenient for welding the edge covering portion 22 and the upper surface of the bottom portion 13, and improves the connection strength of the aluminum bowl 2 and the cap 1.

In an alternative embodiment, the brim part 22 comprises a first brim part 221, a second brim part 22 and a third brim part 22, the second brim part 22 is used for connecting the first brim part 221 and the third brim part 22, the first brim part 221 is used for covering the upper surface (the surface close to the cap 1) of the bottom 13 of the cover plate, the second brim part 22 is used for covering the end surface of the cover plate, and the third brim part 22 is used for covering the lower surface (the surface facing away from the cap 1) of the cover plate. Optionally, in the radial direction of the cover plate, the length from the end of the bottom portion 13 to the end of the cap 1 is a first length, and the length of the first clad portion 221 is a second length, wherein the second length is 2/3-4/5 of the first length, so that the first clad portion 221 can cover more of the upper surface of the bottom portion 13.

In an alternative embodiment, when the first brim part 221 covers the upper surface of the bottom part 13, the welding site 3 of the cover plate and the aluminum bowl 2 is close to the rear position of the first brim part 221 (the rear position is a position far from the second brim part 22).

In one embodiment, referring to fig. 1, 4 and 5, the relief holes 14 are arranged at positions offset from the welding positions 3 in the circumferential direction of the cap assembly.

In the prior art, the pressure relief hole 14 and the weld site 3 would be located in the same radial direction of the cap assembly, e.g., the pressure relief hole 14 would be located directly above the weld site 3, or the weld site 3 would be located directly below the pressure relief hole 14. Or another way is: the center of the pressure relief hole 14 and the center of the welding position 3 are on the same radial axis. In the prior art, after the arrangement, the pressure relief hole 14 and the welding position 3 are easy to interfere; in addition, due to the arrangement mode of the pressure relief hole 14 and the welding position 3, the pressure relief hole 14 can reduce the structural strength of the bottom 13 of the cap 1 at the welding position 3, so that the connection strength of the cap 1 and the aluminum bowl 2 at the connection position is reduced.

Referring to fig. 4 and 5, in this embodiment, the relative arrangement position of the pressure relief hole 14 and the welding position 3 is defined, specifically, the arrangement position of the pressure relief hole 14 and the welding position 3 are arranged to be offset in the circumferential direction of the cap assembly, so that the welding position 3 and the pressure relief hole 14 are arranged to be away from each other in the circumferential direction of the cap assembly, and after such arrangement, the interference of the positions of both the welding position 3 and the pressure relief hole 14 is avoided. In addition, the arrangement position of the pressure relief hole 14 is staggered with the welding position 3, the arrangement of the pressure relief hole 14 does not affect the structural strength of the bottom 13 of the cap 1 at the welding position 3, and the connection strength of the cap 1 and the aluminum bowl 2 at the connection position is improved.

Referring to fig. 5, in which the arrangement position of the pressure relief hole 14 is staggered from the welding position 3 in the circumferential direction of the cap assembly, it can be understood that the projection of the pressure relief hole 14 on the bottom 13 of the cap 1 does not overlap the projection of the welding position 3 on the bottom 13 of the cap 1; or it can be understood that in the circumferential direction of the side 12 of the cap 1, the relief hole 14 is arranged in a first position and in the circumferential direction of the bottom 13 of the cap 1, the weld site 3 is arranged in a second position, wherein the line (L2) connecting the first and second positions is not coaxial with the radial axis (L1) (rounding mandrel) of the cap assembly.

In one embodiment, at least two pressure relief holes 14 are arranged in the circumferential direction of the cap 1, a preset area is formed between two adjacent pressure relief holes 14, and the arrangement position of the welding position 3 corresponds to the position of the preset area.

In this embodiment, at least two relief holes 14 are defined in the circumferential direction of the cap 1, improving the overall relief capacity of the cap assembly.

In this embodiment, a preset area is formed between two adjacent pressure relief holes 14, wherein the preset area is a blank area. The weld site 3 provided on the bottom 13 of the cap 1 is located opposite the blank area on the side 12 of the cap 1, i.e. the weld site 3 is located between two pressure relief holes 14, and the pressure relief holes 14 and weld site 3 are offset in the cap assembly.

In a specific embodiment, as shown with reference to fig. 4 and 5, three welding sites 3 are provided evenly in the circumferential direction of the bottom 13. Three relief holes 14 are provided uniformly in the circumferential direction of the bottom 13 and the top 11.

In an alternative embodiment, a safety valve 211 is arranged on the upper surface of the aluminum bowl 2 (the pressure of the safety valve 211 is 8.5-10.5 mPa). For example, the safety valve 211 is an explosion-proof score line. Specifically, the aluminum bowl 2 comprises an aluminum bowl body 21 and a covered edge part 22, and the aluminum bowl body 21 and the covered edge part 22 are integrally formed. Wherein a safety valve 211 is arranged on the upper surface (facing the cap 1) of the aluminum bowl body 21.

In an alternative embodiment, the pressure relief hole 14 formed in the cap 1 and the safety valve 211 formed in the aluminum bowl 2 are arranged opposite to each other, so that the pressure relief of the battery is facilitated in the case of breakage of the aluminum bowl 2.

In one embodiment, the pressure relief hole 14 is circular or oval; the pressure relief hole 14 is an oval shape having a major axis and a minor axis perpendicular to each other, and the major axis extends in the circumferential direction of the cap 1.

In this embodiment, the shape of the pressure relief hole 14 is defined, for example, the pressure relief hole 14 may be circular or oval, which facilitates the machining of the structure of the pressure relief hole 14.

In a specific embodiment, the pressure relief hole 14 is an ellipse, the ellipse having a major axis and a minor axis perpendicular to each other, the major axis extending in the circumferential direction of the cap 1, and specifically, the opening area of the pressure relief hole 14 can be appropriately increased, and the area of the side portion 12 where the pressure relief hole 14 is not opened can be appropriately decreased, so that the area where the pressure relief hole 14 is not opened can be cleaned conveniently.

In an alternative embodiment, the side portion 12 of the cap 1 is provided with a pressure relief hole 14, and the opening area of the pressure relief hole 14 provided in the side portion 12 of the cap 1 is equal to or larger than the area of the side portion 12 of the cap 1 where the pressure relief hole 14 is not provided.

In one embodiment, the cap 1 has an outer surface facing away from the aluminum bowl 2, on which outer surface a nickel coating is provided.

In this embodiment, the outer surface of the cap 1 is plated with a nickel coating. The nickel plating helps to improve and stabilize the oxidation resistance and the electrical conductivity of the cap 1, and specifically, the nickel plating coating is arranged on the outer surface of the cap 1, and can improve the stability and the corrosion resistance of the metal surface and reduce the contact internal resistance. In this embodiment, the cap assembly is applied to a battery having an internal resistance of less than 1m Ω.

In one embodiment, the nickel coating has a thickness of 1 μm to 3 μm.

In this embodiment, the thickness of the nickel coating is limited to improve the stability and corrosion resistance of the outer surface of the cap assembly without affecting the overall structure of the cap assembly.

In one embodiment, the cap assembly further comprises a gasket 6, the gasket 6 forming a groove, the rim portion 22 of the aluminum bowl 2 being disposed within the groove.

In this embodiment, the sealing ring 6 is wrapped around the edge 22 of the aluminum bowl 2, and the sealing ring 6 is used for sealing and fixing the cap assembly to form a complete battery cap assembly. The sealing ring 6 plays a role of sealing and insulation. In the application of the cap assembly to the battery, the sealing rings 6 are positioned between the edge wrapping portion 22 and the shell 4 and between the cap 1 and the shell 4, so that the shell 4 is prevented from contacting the aluminum bowl 2, the shell 4 and the cap assembly are prevented, and the short circuit phenomenon of the battery is prevented.

In an alternative embodiment, the sealing ring 6 insulates the cap assembly from the battery case 4, wherein when the sealing ring 6 is disposed on the cap assembly, a dispensing process (e.g., hot melt adhesive may be used) is performed on the contact surface of the sealing ring 6 with the edge 22 of the aluminum bowl 2 to facilitate the disposition of the sealing ring 6 on the cap assembly. Referring to fig. 3, the positions a and b show the dispensing positions on the seal ring 6.

In one embodiment, the sealing ring 6 is a hot melt.

In this embodiment, the material of restricting sealing washer 6 is the hot melt material, and when the battery short circuit, the inside temperature of battery rose, and the sealing washer 6 of hot melt material can be melted for there is the gap between casing 4 and the block subassembly, carries out the pressure release to the battery. For example, the sealing ring 6 is made of a hot-melt plastic material or a hot-melt plastic material. Wherein the sealing ring 6 is of a complete structure, thereby avoiding cracks and unfilled corner limitation and influencing the insulation between the cap assembly and the shell 4.

In this embodiment, the cap assembly is applied to a battery, which is a cylindrical battery. The battery further comprises a shell 4, wherein the shell 4 comprises a shell 4 body, a first bending structure 41 connected with the shell 4 body and a second bending structure 42 connected with the first bending structure 41. Wherein the body of the shell 4, the first bending structure 41 and the second bending structure 42 are integrally formed.

Wherein first structure 41 of buckling is sunken to casing 4 body inside relative casing 4 body, second structure 42 of buckling, places at casing 4 body when electric core 5, and first structure 41 of buckling can play limiting displacement to electric core 5, avoids electric core 5 to rock the phenomenon at casing 4 this internal.

The second bending structure 42 is arranged in a protruding manner relative to the first bending structure 41, wherein the first bending structure 41 and the second bending structure 42 define the arrangement position of the sealing ring 6, so that the sealing ring 6 is abutted against the inner surfaces of the first bending structure 41 and the second bending structure 42, and the sealing ring 6 can better isolate the housing 4 and the cap assembly.

The battery cell 5 is placed in the body of the casing 4, and the battery cell 5 includes a first tab 51 and a second tab 52, where the first tab 51 is connected to the lower surface (the surface facing away from the cap 1) of the aluminum bowl 2, and the second tab 52 is connected to the bottom 13 of the body of the casing 4. The first tab 51 may be a positive tab and the second tab 52 may be a negative tab, or the first tab 51 may be a negative tab and the second tab 52 may be a positive tab.

In this embodiment, the cap assembly of the above-described structure is applied to a battery having a salt spray test of more than 8H.

In a third aspect, an electronic device is provided. The battery comprises a battery as described in the second aspect. For example, the electronic device may be a notebook computer, a camera, a remote control, a wearable device, a headset, etc.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A cap assembly, comprising:

the safety cap comprises a cap (1), wherein the cap (1) comprises a top part (11), a bottom part (13) and a side part (12), two ends of the side part (12) are respectively connected with the top part (11) and the bottom part (13), a pressure relief hole (14) is formed in the side part (12) of the cap (1), and the pressure relief hole (14) extends to the top part (11);

aluminium bowl (2), lid cap (1) lid is established on aluminium bowl (2), aluminium bowl (2) have package portion (22), package portion (22) parcel bottom (13), package portion (22) with the upper surface welding of bottom (13) forms welding position (3).

2. The cap assembly according to claim 1, wherein the pressure relief hole (14) is provided at a position offset from the welding site (3) in a circumferential direction of the cap assembly.

3. The cap assembly according to claim 1, characterized in that at least two pressure relief holes (14) are provided in the circumferential direction of the cap (1), a predetermined area is formed between two adjacent pressure relief holes (14), and the welding position (3) is provided at a position corresponding to the predetermined area.

4. The cap assembly of claim 1, wherein the pressure relief vent (14) is circular or oval;

the pressure relief hole (14) is oval, the oval has mutually perpendicular's major axis and minor axis, the major axis extends along the circumferential direction of block (1).

5. The cap assembly according to claim 1, characterized in that the cap (1) has an outer surface facing away from the aluminum bowl (2), on which outer surface a nickel coating is provided.

6. The cap assembly of claim 5, wherein the nickel coating has a thickness of 1 μm to 3 μm.

7. The cap assembly of claim 1, further comprising a gasket (6), the gasket (6) forming a groove, the rim portion (22) of the aluminum bowl (2) being disposed within the groove.

8. The cap assembly according to claim 7, characterized in that the sealing ring (6) is a hot melt.

9. A battery comprising the cap assembly of any one of claims 1-8.

10. An electronic device characterized in that the battery comprises the battery of claim 9.