CN208889708U

CN208889708U - Lithium ion battery cover and lithium ion battery

Info

Publication number: CN208889708U
Application number: CN201821935926.XU
Authority: CN
Inventors: 方芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2019-05-21
Anticipated expiration: 2028-11-21

Abstract

The utility model provides a kind of lithium ion battery cover and lithium ion battery, and the contact area of orifice plate and explosion rupture disk is larger, is easy to weld and firm welding, improves the structural stability of nut cap；Also, the explosion-proof groove of explosion rupture disk is not perishable, reduces the risk of explosion-proof groove rupture or perforation, improves the security performance of nut cap.

Description

Lithium ion battery cover and lithium ion battery

[technical field]

The utility model relates to battery technology field more particularly to a kind of lithium ion battery covers and lithium ion battery.

[background technique]

Currently, lithium ion battery has been widely used for the fields such as communication, illumination, energy storage, electric vehicle.Nut cap is lithium ion The significant components of battery, in general, the explosion rupture disk in nut cap needs to be soldered to orifice plate, and orifice plate connects the positive pole ear of battery core, with Realize the connection of lithium ion cell positive, the orifice plate of existing nut cap and the contact area of explosion rupture disk are smaller, weld more difficult and weld It connects that fastness is poor, influences the structural stability of lithium ion battery；Also, explosion-proof groove, lithium ion battery are provided in explosion rupture disk Interior electrolyte perishable explosion-proof groove after long-time use, easily leads to explosion-proof groove rupture or perforation, influences lithium ion battery Security performance.

In consideration of it, above scarce to overcome it is really necessary to provide a kind of novel lithium ion battery cover and lithium ion battery It falls into.

[utility model content]

Larger, convenient welding that the purpose of the utility model is to provide the contacts area of a kind of orifice plate and explosion rupture disk, welding jail Gu, the explosion-proof groove that improves structural stability and explosion rupture disk is not easy burn into and reduces the risk of explosion-proof groove rupture or perforation, mentions The lithium ion battery cover and lithium ion battery of high safety performance.

To achieve the goals above, the utility model provides a kind of lithium ion battery cover, including top cover, explosion rupture disk, hole Plate and sealing ring, the edge of the top cover is opposite with the marginal position of the explosion rupture disk, and the center of the explosion rupture disk is to far from institute The direction for stating top cover is recessed to form weld part and the explosion-proof portion around the weld part, plane where the weld part with it is described Plane where the edge of explosion rupture disk is parallel, and the explosion-proof portion connects the edge of the weld part and the explosion rupture disk, and described Explosion-proof portion is obliquely installed on the weld part, offers explosion-proof groove on the surface far from the top cover in the explosion-proof portion, The explosion-proof groove is located at the position close to the edge of the explosion rupture disk；The orifice plate is set to the separate described of the weld part The side of top cover, and the weld part is welded on the orifice plate；The sealing ring is set to edge and the institute of the explosion rupture disk It states between the edge of orifice plate.

In a preferred embodiment, the shape of the weld part is circle, and the shape of the explosion-proof groove is circle, The explosion-proof groove and the weld part are coaxially disposed, and the diameter of the explosion-proof groove is greater than the diameter of the weld part.

In a preferred embodiment, anti-corrosion layer, the anti-corrosion layer are provided on the surface of the explosion-proof groove For pitch glue-line.

In a preferred embodiment, the sealing ring includes upper surface and the lower surface opposite with the upper surface, The upper surface is resisted against the edge of the explosion rupture disk, and the lower surface is resisted against the edge of the orifice plate, the following table towards Direction far from the upper surface extends to form extension, the extension include close to the sealing circle center inner wall and with The opposite outer wall of the inner wall, refractory layer is coated on the inner wall, and the refractory layer is ceramic layer.

In a preferred embodiment, the inner wall protrudes to form clamping to close to the direction of the sealing circle center Portion, the orifice plate are fastened between the lower surface and the holding section.

In a preferred embodiment, V-groove, the V-groove are offered between the inner wall and outer wall of the extension Shell for clamping lithium ion battery.

In a preferred embodiment, the edge of the top cover extends to form installation to the direction close to the sealing ring Portion, the outer wall of the extension are bent to the direction at the center far from the sealing ring, the outer wall of the extension it is curved One end coats the mounting portion.

In a preferred embodiment, further include steel loop, the steel loop be set to the explosion rupture disk and the top cover it Between.

In a preferred embodiment, the orifice plate offers multiple perforative air holes.

The utility model also provides a kind of lithium ion battery, including above-mentioned lithium ion battery cover.

Compared with prior art, lithium ion battery cover and lithium ion battery provided by the utility model, orifice plate with it is explosion-proof The contact area of piece is larger, is easy to welding and firm welding, improves the structural stability of nut cap；Also, explosion rupture disk is explosion-proof Groove is not perishable, reduces the risk of explosion-proof groove rupture or perforation, improves the security performance of nut cap.

[Detailed description of the invention]

Fig. 1 is the structural schematic diagram of lithium ion battery cover provided by the utility model；

Fig. 2 is the bottom view of the explosion rupture disk of lithium ion battery cover shown in FIG. 1；

Fig. 3 is the structural schematic diagram of the sealing ring of lithium ion battery cover shown in FIG. 1.

[specific embodiment]

It is clear in order to be more clear the purpose of this utility model, technical solution and advantageous effects, below in conjunction with attached Figure and specific embodiment, the present invention will be further described in detail.It should be understood that described in this specification Specific embodiment is not intended to limit the utility model just for the sake of explaining the utility model.

Referring to Fig. 1, the utility model provides a kind of lithium ion battery cover 100, including top cover 10, explosion rupture disk 20, hole Plate 30 and sealing ring 40.

The edge 101 of the top cover 10 is opposite with 201 position of edge of the explosion rupture disk 20, the center of the explosion rupture disk 20 It is recessed to form weld part 21 and around the explosion-proof portion 22 of the weld part 21, the weld part to the direction far from the top cover 10 Plane where 21 is parallel with the plane where the edge 201 of the explosion rupture disk 20, and the explosion-proof portion 22 connects the weld part 21 and the explosion rupture disk 20 edge 201, and the explosion-proof portion 22 is obliquely installed on the weld part 21, the explosion-proof portion 22 The surface far from the top cover 10 on offer explosion-proof groove 221, the explosion-proof groove 221 is located at close to the explosion rupture disk 20 Edge 201 position；The orifice plate 30 is set to the side far from the top cover 10 of the weld part 21, and the welding Portion 21 is welded on the orifice plate 30；The sealing ring 40 is set to the edge 201 and the orifice plate 30 of the explosion rupture disk 20 Between edge.

The center of lithium ion battery cover 100 provided by the utility model, explosion rupture disk 20 is recessed to the direction far from top cover 10 The explosion-proof portion 22 for forming weld part 21 and surrounding weld part 21 is fallen into, weld part 21 is welded on orifice plate 30, flat where orifice plate 30 Face is overlapped with the plane where weld part 21, i.e. weld part 21 and the contact area of orifice plate 30 is larger, is conducive to welding and welding jail Gu improving structural stability；Also, explosion-proof groove 221 is located at the position close to the edge 201 of the explosion rupture disk 20, close The position at the edge 201 of explosion rupture disk 20 is less susceptible to be reduced explosion-proof by electrolytic corrosion than the position at close 20 center of explosion rupture disk The risk of the rupture of groove 221 or perforation, improves security performance.

Referring to Figure 2 together, the shape of the weld part 21 is circle, and the shape of the explosion-proof groove 221 is circle, institute It states explosion-proof groove 221 to be coaxially disposed with the weld part 21, and the diameter of the explosion-proof groove 221 is greater than the weld part 21 Diameter, weld part 21 are that round and circular weld part 21 is resisted against orifice plate 30, further increase weld part 21 and orifice plate 30 Contact area, weld part 21 described in explosion-proof groove 221 is coaxially disposed, explosion-proof recessed when the air pressure in lithium ion battery is excessively high Slot 221 ruptures, it is therefore prevented that lithium ion battery explosion reduces the application risk of lithium ion battery.

In present embodiment, in order to further prevent explosion-proof groove 221 by electrolytic corrosion, the explosion-proof groove 221 Anti-corrosion layer is provided on surface, the anti-corrosion layer is pitch glue-line.Pitch glue-line can effectively prevent electrolytic corrosion anti- Quick-fried groove 221, also, the viscosity of pitch glue-line is larger, and what can be consolidated is adhered on explosion-proof groove 221.

Also referring to Fig. 3, the sealing ring 40 includes upper surface 401 and the lower surface opposite with the upper surface 401 402, the upper surface 401 is resisted against the edge 201 of the explosion rupture disk 20, and the lower surface 402 is resisted against the orifice plate 30 Edge, the lower surface 402 extend to form extension 41 to the direction far from the upper surface 401, and the extension 41 includes Close to the inner wall 411 and the outer wall 412 opposite with the inner wall 411 of the sealing circle center, it is coated on the inner wall 411 resistance to Thermosphere 413, the refractory layer 413 are ceramic layer.When working long hours, internal temperature increases lithium ion battery, in order to prevent Sealing ring 40 melts because temperature increases or generates deformation, influences the leakproofness of lithium ion battery cover 100, the inner wall of extension 41 It is coated with refractory layer 413 on 411, enhances the structural stability of sealing ring 40, improves the closed of lithium ion battery cover 100 Property.

The inner wall 411 protrudes to form holding section 414 to the direction close to 40 center of sealing ring, and the orifice plate 30 blocks It is held between the lower surface 402 and the holding section 414, holding section 414 can share the weight of orifice plate 30, prevent orifice plate 30 It is detached from explosion rupture disk 20.Specifically, the orifice plate 30 offers multiple perforative air holes 301, when inside lithium ion cell generates When gas, gas is entered between explosion rupture disk 20 and orifice plate 30 by air hole 301.

In present embodiment, V-groove 415, the V-type are offered between the inner wall 411 and outer wall 412 of the extension 41 Slot 415 is used for the shell of clamping lithium ion battery, i.e., when lithium ion battery is assembled, the shell of lithium ion battery is fastened in institute It states in V-groove 415.Specifically, the edge 101 of the top cover 10 extends to form mounting portion to the direction close to the sealing ring 40 11, the outer wall 412 of the extension 41 is bent to the direction at the center far from the sealing ring 40, the outer wall of the extension 41 412 curved one end coats the mounting portion 11, lithium ion battery can be prevented in assembling, mounting portion 11 connects with shell Touching, prevents top cover 10 from contacting with shell, causes short circuit, enhance the security performance of lithium ion battery.

In one preferred embodiment, lithium ion battery cover 100 provided by the utility model, further includes steel loop 50, the steel loop 50 is set between the explosion rupture disk 20 and the top cover 10.The internal resistance of the steel loop 50 is larger, can prevent Lithium ion battery overcharge and electric current is excessive, while the also gap between adjustable explosion rupture disk 20 and top cover 10, guarantee contact Area improves the safety anti-explosive performance of battery.

The utility model also provides a kind of lithium ion battery, including above-mentioned lithium ion battery cover 100, lithium ion battery The structural stability of nut cap 100 and highly-safe, that is, improve the structural behaviour and security performance of lithium ion battery.

Lithium ion battery cover 100 and lithium ion battery provided by the utility model, the contact of orifice plate 30 and explosion rupture disk 20 Area is larger, is easy to welding and firm welding, improves the structural stability of nut cap；Also, the explosion-proof groove 221 of explosion rupture disk 20 It is not perishable, the risk of the explosion-proof rupture of groove 221 or perforation is reduced, the security performance of nut cap is improved.

The utility model is not only in the description and the implementation described, therefore for the personnel of familiar field For other advantage and modification is easily implemented, therefore without departing substantially from universal defined by claim and equivalency range Spirit and scope in the case where, the utility model is not limited to specific details, representative equipment and shown here as with retouch The diagram example stated.

Claims

1. a kind of lithium ion battery cover, it is characterised in that: including top cover, explosion rupture disk, orifice plate and sealing ring, the side of the top cover Edge is opposite with the marginal position of the explosion rupture disk, and the center of the explosion rupture disk is recessed to form welding to the direction far from the top cover Portion and the explosion-proof portion for surrounding the weld part, the plane where the weld part and the plane where the edge of the explosion rupture disk are flat Row, the explosion-proof portion connects the edge of the weld part and the explosion rupture disk, and the explosion-proof portion is obliquely installed in the welding In portion, explosion-proof groove is offered on the surface far from the top cover in the explosion-proof portion, the explosion-proof groove is located at close to described The position at the edge of explosion rupture disk；The orifice plate is set to the side far from the top cover of the weld part, and the weld part It is welded on the orifice plate；The sealing ring is set between the edge of the explosion rupture disk and the edge of the orifice plate.

2. lithium ion battery cover as described in claim 1, it is characterised in that: the shape of the weld part is circle, described The shape of explosion-proof groove is circle, and the explosion-proof groove and the weld part are coaxially disposed, and the diameter of the explosion-proof groove is big In the diameter of the weld part.

3. lithium ion battery cover as claimed in claim 2, it is characterised in that: be provided on the surface of the explosion-proof groove resistance to Corrosion layer, the anti-corrosion layer are pitch glue-line.

4. lithium ion battery cover as claimed in claim 3, it is characterised in that: the sealing ring include upper surface and with it is described The opposite lower surface in upper surface, the upper surface are resisted against the edge of the explosion rupture disk, and the lower surface is resisted against the orifice plate Edge, the following table extends to form extension away from the direction of the upper surface, and the extension includes close to described The inner wall and the outer wall opposite with the inner wall of circle center are sealed, refractory layer is coated on the inner wall, the refractory layer is pottery Enamel coating.

5. lithium ion battery cover as claimed in claim 4, it is characterised in that: the inner wall is to close to the sealing circle center Direction protrude to form holding section, the orifice plate is fastened between the lower surface and the holding section.

6. lithium ion battery cover as claimed in claim 5, it is characterised in that: opened between the inner wall and outer wall of the extension Equipped with V-groove, the V-groove is used for the shell of clamping lithium ion battery.

7. lithium ion battery cover as claimed in claim 6, it is characterised in that: the edge of the top cover is to close to the sealing The direction of circle extends to form mounting portion, and the outer wall of the extension is bent to the direction at the center far from the sealing ring, described Curved one end of the outer wall of extension coats the mounting portion.

8. lithium ion battery cover as described in claim 1, it is characterised in that: further include steel loop, the steel loop is set to institute It states between explosion rupture disk and the top cover.

9. lithium ion battery cover as described in claim 1, it is characterised in that: the orifice plate offers multiple perforative ventilative Hole.

10. a kind of lithium ion battery, it is characterised in that: including lithium-ion battery as described in any one of claims 1-9 Cap.