MINIATURE BUTTON RECHARGEABLE LITHIUM BATTERY STRUCTURE ASSEMBLY

Abstract

A miniature button rechargeable lithium battery structure assembly includes an upper housing, a lower housing and an apron, which relates to the technical field of electronic structure assembly. The upper housing is snap-fit into the lower housing, and a side wall of the upper housing and a side wall of the lower housing are sealed with the apron. The miniature button rechargeable lithium battery structure assembly solves the competing requirements between the explosion-proof structure and the sealed structure in the traditional technology. The problem is solved that when the explosion-proof performance is improved, the yield of the battery assembly is reduced, and the problem is solved that when the sealing performance is improved, the battery capacity is reduced.

Claims

1. A miniature button rechargeable lithium battery structure assembly, comprising an upper housing, a lower housing and an apron; wherein, the upper housing is snap-fit into the lower housing, and a side wall of the upper housing and a side wall of the lower housing are sealed with the apron.

2. The miniature button rechargeable lithium battery structure assembly of claim 1, wherein, a wall thickness of the apron is gradually increased along an installation direction.

3. The miniature button rechargeable lithium battery structure assembly of claim 1, wherein, an outer wall of the apron is provided with a glue layer, and the outer wall of the apron is fixed to an inner wall of the lower housing by the glue layer.

4. The miniature button rechargeable lithium battery structure assembly of claim 1, wherein, the upper housing comprises a first cup body, and the lower housing comprises a second cup body, and a first cup opening of the first cup body is connected to a first extension guide barrel by a gradually expanding guide barrel, and a second cup opening of the second cup body is connected to a second extension guide barrel by the gradually expanding guide barrel.

5. The miniature button rechargeable lithium battery structure assembly of claim 4, wherein, in an assembled state, the first extension guide barrel of the upper housing is extended to the second cup body of the lower housing, a primary sealing area is formed between the first extension guide barrel of the upper housing and the second cup body of the lower housing by the apron, and a secondary sealing area is formed between the first cup body of the upper housing and an end of the second extension guide barrel of the lower housing by the apron.

6. The miniature button rechargeable lithium battery structure assembly of claim 5, wherein, the end of the second extension guide barrel of the lower housing is provided in a neck shape.

7. The miniature button rechargeable lithium battery structure assembly of claim 5, wherein, an area between the second extension guide barrel of the lower housing and the first cup body of the upper housing is provided with a gap, and the gap is between the primary sealing area and the secondary sealing area, and a pressure relief gap is formed between the gap and the apron.

8. The miniature button rechargeable lithium battery structure assembly of claim 6, wherein, an area from a neck of the lower housing to an end of the first extension guide barrel of the upper housing is a pressure relief active area.

9. The miniature button rechargeable lithium battery structure assembly of claim 8, wherein, in a pressure relief state, the end of the first extension guide barrel of the upper housing slides over to the neck of the lower housing, the upper housing and the lower housing are separated from the primary sealing area and the secondary sealing area, and an electrolyte in a battery overflows from an end of the lower housing along the pressure relief gap.

10. The miniature button rechargeable lithium battery structure assembly of claim 1, wherein, the apron adopts a material selected from PEEK, PEI or PI.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to clearly explain specific embodiments of the present invention or technical solutions in the prior art, simple introductions are made for drawings that need to be used in the specific embodiments or depictions of the prior art below. In all the drawings, similar elements or portions are generally marked by similar reference signs. In the drawings, respective elements, or portions are not necessarily drawn according to actual proportions.

[0044] FIG. 1 is a whole structure diagram of the present invention.

[0045] FIG. 2 is a structure diagram of an upper housing of the present invention.

[0046] FIG. 3 is a structure diagram of an apron of the present invention.

[0047] FIG. 4 is a structure diagram of a lower housing of the present invention.

[0048] FIG. 5 is a structure diagram showing an assembly of the present invention.

[0049] FIG. 6 is a structure diagram of a failure state of the present invention.

[0050] In the drawings: 1: upper housing; 2: lower housing; 3: primary sealing area; 4: gradually expanding guide barrel; 5: extension guide barrel; 6: apron; 7: secondary sealing area; 8: cup body; 9: pressure relief area; 10: pressure groove; and 11: fold.

DETAILED DESCRIPTION OF EMBODIMENTS

[0051] The embodiments of technical solutions of the present invention are further described in detail with reference to the drawings below. The following embodiments are only used as examples for explaining the technical solutions of the present invention, and should not be construed as limiting the protective scope of the present invention.

[0052] As shown in FIG. 1 to FIG. 6, the miniature button rechargeable lithium battery structure assembly, includes the upper housing 1, the lower housing 2 and the apron 6. The upper housing 1 is snap-fit into the lower housing 2, and the side wall of the upper housing 1 and the side wall of lower housing 2 are sealed with the apron 6.

[0053] The wall thickness of the apron 6 is gradually increased along an installation direction, and a gradually changing wall thickness of the apron is 0.01 to 0.1 mm.

[0054] Each of the upper housing 1 and the lower housing 2 includes the cup body 8, and the cup opening of the cup body 8 is connected to the extension guide barrel 5 by the gradually expanding guide barrel 4, wherein the gradually expanding guide barrel is a barrel that gradually increases in a radial direction; an end of the extension barrel is connected to an end of the gradually expanding guide barrel, and a diameter of the extension barrel is bigger than a diameter of the cup body, wherein the cup body, the gradually expanding guide barrel, the extension guide barrel and the apron may adopt one or more of shapes that have coating functions, such as a square shape, an oval shape, a cylindrical shape and the like.

[0055] The lower portion of the apron is also provided with a fold 11 that extends inwardly, the end of the extension guide barrel of the upper housing is inserted in the area between the fold 11 and the side wall of the apron, to implement performing activity insertion on the apron when assembling.

[0056] In an assembled state, the extension guide barrel 5 of the upper housing 1 is extended to the cup body 8 of the lower housing 2, the primary sealing area 3 is formed between the extension guide barrel 5 of the upper housing 1 and the cup body 8 of the lower housing 2 by the apron 6, and the secondary sealing area 7 is formed between the cup body 8 of the upper housing 1 and an end of the extension guide barrel 5 of the lower housing 2 by the apron 6.

[0057] The area from the neck of the lower housing to the end of the extension guide barrel of the upper housing is the pressure relief active area 9. In a pressure relief state, the upper housing 1 moves upwardly, the end of the extension guide barrel of the upper housing slides to the neck of the lower housing, the upper housing and the lower housing are separated from the primary sealing area and the secondary sealing area, and an electrolyte in the battery overflows from the end of the lower housing 2 along the pressure relief gap.

[0058] The end of the extension guide barrel 5 of the lower housing 2 is provided in a neck shape.

[0059] The pressure relief gap is disposed between, the portion where the lower housing 2 and the upper housing 1 are between the primary sealing area and the secondary sealing area, and the apron 6.

[0060] The outer wall of the apron 6 is provided with the glue layer, and the outer wall of the apron 6 is fixed to the inner wall of the lower housing 2 by the glue layer.

[0061] The apron 6 adopts any one of PEEK, PEI and PI.

[0062] Specifically, the pressure groove 10 is disposed on the bottom surface of the cup body of the lower housing to implement the stable assembling when assembling.

[0063] The axial sealing amount of the primary sealing area is 1.5 to 2.5 mm, the axial sealing amount of the secondary sealing area is 0.1 to 0.5 mm, the pressure relief active area 9 is disposed between the primary sealing area and the secondary sealing area, and the axial displacement amount of the pressure relief active area 9 is 1.5 to 2.0 mm. In an assembled state, the proportion of the three may be 10:8:1.

[0064] At present, these types of batteries are a series of batteries with conventional models of 0854/1054/1254/1454/1654. Model 1254 battery is an example. The data collection and analysis are performed on specifications and performances of batteries of respective manufacturers and the new structure of the present application. The results are presented in the following table.

TABLE-US-00001 Size of outer shape Standard Ratio of (mm) capacity Volume capacity Explosion-pro Defect of Brand Diametter Height (mAh) (mm.sup.3) to volume of structure structure LIR1254 12.5 5.4 45 211.95 21.23% Null Having explosion risk CP1254(1) 12 5.4 50 203.472 24.57% Piston side Bad sealing hole pressure effect and low relief manufacturing yield of product CP1254(2) 12.1 5.4 60 205.1676 29.24% Pressure relief Bad sealing without seal effect and low manufacturing yield of product CP1255 12.5 5.5 50 215.875 23.16% Null Having explosion risk The 12 5.4 80 203.472 31.95% Movable gap Good sealing present pressure relief effect and 100% product sealing yield

[0065] The table shows that Brand CP1254(2) battery is a battery having the largest ratio of capacity to volume in the current market, and its explosion-proof structure is a structure without a seal. Due to the bad sealing effect of the structure, the yield is reduced because of electrolyte leakage and failure, which is caused by liquid leakage in the use of the battery. Brands LIR1254 and CP1254(2) can have good sealing performance, however, compared with other products, volume is large, capacity is low, and the ratio of capacity to volume is only 21.23% and 23.16%. In order to improve the sealing effect, the explosion-proof structure has to be cancelled, therefore reducing the security of the battery.

[0066] Wall thicknesses of the upper housing and the lower housing in the prior art are 0.2 to 0.25 mm, while the wall thickness of the upper housing and the lower housing of the present product in this application is 0.15 mm. Specifically, the wall thickness of the apron in the prior art is 0.2 to 0.25 mm, while the wall thickness of the present product is 0.08 mm. Compared with the prior art, the structure of the present product saves the space, thereby improving the ratio of capacity to volume.

[0067] Through the data of the present solution, it is clear that the size of the housing of the present solution is the same as the size of CP1254(1). That is, it is possible to implement the product while still adopting the existing mold, thereby saving the cost of using a new mold, in turn greatly reducing the economic expense and labor. By changing the thickness and structure of the apron thereof, the capacity is improved, and the external volume is reduced after completing the assembling, such that the ratio of capacity to volume reaches up to 31.95%. This is 2.71% higher than the highest ratio of capacity to volume of 29.24% in the existing battery, and is more than five times of 0.5% according to the prior art. The higher percentage increase of 2.71% may improve the endurance time of battery being used for 8 hours continuously. When the battery is applied to a Bluetooth earphone, according to the use time of the earphone, the average time of using the earphone is approximately 1.5 hours. The endurance time of the product being used continuously for 8 hours a day can, at least, reach up to 6 days without having to recharge the product, which reduces the charging times of the battery. The discharging and charging times of the battery can be reduced while improving the inconvenience of charging the battery, and the lifetime of the battery can be extended.

[0068] A cross angle between the side walls of the gradually expanding guide barrel in a cross-section direction is 10 to 25. An outer wall of the apron may also be disposed in a gradually expanding manner, and a cross angle between the side walls of the apron in a cross-section direction is 3 to 15.

[0069] A radial offset between the extension guide barrel and the cup body is 0.05 to 0.1 mm; wherein a height of the cup body of the upper housing is 1.91 mm; a height of the cup body of the lower housing is 1.74 mm; and an axis length of the extension guide barrel of the lower housing is 2.24 mm.

[0070] A gradually changing wall thickness of the apron is 0.01 to 0.1 mm; and a size of the apron at the primary sealing area is 1.5 mm to 2.5 mm, preferably, 2.12 mm.

[0071] The magnitude of interference between the upper housing and the apron is 0.02 to 0.1 mm, the gap between the apron and the side wall of the lower housing is 0.05 mm, and the magnitude of interference between the lower housing and the primary sealing area of the apron is 0.02 to 0.05 mm.

[0072] The sealed assembly has a certain vertical activity amount, about 2.0 to 2.5 mm. When the pressure of the internal cabin of the battery is too large, the upper housing, the apron and the lower housing will implement an axial movement within 2.0 mm under the effect of pressure, so that the primary sealing area of the battery is partially destroyed, thereby implementing the primary pressure relief of the battery.

[0073] When the internal pressure of the battery increases rapidly, the primary sealing area will be entirely destroyed, and an axial movement amount is greater than 2.0 mm, so that the battery pressure is opened along a gap cooperation position between the apron and the lower housing, to release the internal pressure of the battery to the gap between the upper housing and the apron of the battery.

[0074] When the pressure in the gap between the lower housing and the apron of the battery reaches an upper limit of retention in the secondary sealing area, the secondary sealing area of the battery will be opened to implement external discharging of the internal pressure of the battery.

[0075] The gap of the active area functions as that, after the internal pressure of the battery increases, the size of the active area gradually reduces, and when the size is equal to or close to 0, a side wall gap of three-piece is opened, the pressure inside the battery will be released along the side wall, thereby protecting the battery.

[0076] When the size is close to 0, the neck of the secondary sealing area performs a function of protecting the upper housing from being popped, thereby protecting the security of other adjacent parts.

[0077] Accordingly, the present invention can solve problems of low yield and bad reliability of products caused due to low capacity and competing requirements between the security and the sealing performance of the current miniature rechargeable battery. Through the experimental verification, the size of the present product is stable, the quality is improved, and the yield reaches up to 99.5%. Thus, the mold structure greatly improves the yield and production efficiency of this type of battery. The size, capacity, security, sealing performance and appearance of the present product all exceed parameter requirements of the current similar products.

[0078] At last, it should be noted that the above embodiments are only used for explaining the technical solutions of the present invention, rather than limiting the present invention. Although detailed descriptions are made to the present invention with reference to the aforementioned embodiments, those skilled in the art should understand that modifications or equivalent substitutions may be performed on the technical solutions recorded in the aforementioned embodiments or on partial or entire technical features therein. These modifications or substitutions will not make the essences of corresponding technical solutions depart from the scope of the present invention, and shall fall within the scope of the claims and description of the present invention.