CN214753926U - High-precision battery lower cover - Google Patents

Abstract

The application discloses a high-precision battery lower cover, which comprises an upper cover body and a buffer gasket; the upper end of the lower cover body is bent inwards along the circumferential direction to form a second clamping part with an annular structure; a convex rib with an annular structure is arranged between the inner bottom surface and the inner side surface of the lower cover body; an installation groove with an annular structure is arranged between the lower end surface and the outer side surface of the lower cover body, and a buffer gasket is embedded in the installation groove; the lower end face of the buffer gasket is positioned below the lower cover body, and the outer side face of the buffer gasket is positioned on the outer side of the lower cover body. The novel anti-deformation device is simple in structure, ingenious in layout, simple and convenient to assemble, high in efficiency, convenient to machine, strong in deformation resistance, not prone to deformation in the using process and high in precision.

Description

High-precision battery lower cover

Technical Field

The application relates to the technical field of batteries, in particular to a high-precision battery lower cover.

Background

The battery is a device capable of converting chemical energy into electric energy, and is widely applied to various products such as toys, photoelectric ornaments, small household appliances and the like. The battery can be classified into a cylindrical battery, a square battery, a special-shaped battery and a button battery. The cylindrical battery mainly comprises a steel shell and an electric core arranged inside the steel shell, the steel shell generally comprises a lower cover and a lower cover, the upper end of the lower cover is of an open structure, and the lower cover is hermetically arranged at the upper end of the lower cover through an insulating sealing ring.

However, the existing steel battery shell mainly has the following defects: 1. the existing battery steel shell has small volume and complex internal structure, which directly causes great difficulty in packaging between the upper cover and the lower cover and low packaging efficiency; 2. in order to avoid leakage in the assembling and using processes, the sealing performance between the upper cover and the lower cover is improved, so that the movement amount between the upper cover and the lower cover is even zero, the loss of an explosion-proof function is directly caused, and potential safety hazards exist; 3. the existing battery steel shell has low strength, poor anti-seismic and anti-pressure capability and easy deformation under pressure in the use process.

Therefore, how to improve the existing steel battery case to overcome the above-mentioned deficiencies is a problem to be urgently solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An aim at of this application provides a simple structure, and the overall arrangement is ingenious, and processing is convenient, and intensity is high, and antidetonation compressive capacity is strong, and the difficult high accuracy battery lower cover that takes place to warp.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a high-precision battery lower cover comprises an upper cover body and a buffer gasket; the upper end of the lower cover body is bent inwards along the circumferential direction to form a second clamping part with an annular structure; a convex rib with an annular structure is arranged between the inner bottom surface and the inner side surface of the lower cover body; an installation groove of an annular structure is arranged between the lower end surface and the outer side surface of the lower cover body, and the buffer gasket is embedded in the installation groove; the lower end face of the buffer gasket is located below the lower cover body, and the outer side face of the buffer gasket is located on the outer side of the lower cover body.

Preferably, the distance G between the lower end face of the buffer gasket and the lower end face of the lower cover body is 0.5-1.0 mm, and the distance H between the outer side face of the buffer gasket and the outer side face of the lower cover body is 0.5-1.0 mm. The advantages are that: when the distance G and/or the distance H is less than 0.5mm, the overall shock resistance and pressure resistance are weaker; when the distance G and/or the distance H is larger than 1.0mm, although the overall shock resistance and pressure resistance can be improved, the size of the buffer gasket is too large, and the installation and the use are influenced; therefore, when the distance G and the distance H are 0.5-1.0 mm, the overall comprehensive performance is stronger.

Preferably, the vertical section of the buffer gasket comprises a rectangular section and a circular section, the circular section is integrally connected to the upper right corner of the rectangular section, and one end of the circular section, which is far away from the rectangular section, extends to the inside of the convex rib; the upper end of the rectangular section is provided with a first groove used for wrapping the lower periphery of the side wall of the lower cover body, and the right end of the rectangular section is provided with a second groove used for wrapping the periphery of the bottom wall of the lower cover body. The advantages are that: simple structure, it is rationally distributed, just cushion the packing ring with the mounting groove (promptly the lid down) between the combination is more firm reliable, is favorable to improving cushion the cushioning effect of packing ring.

Preferably, the distance A between one end of the second clamping portion deviating from the lower cover body and the inner side surface of the lower cover body is 2.0-3.0 times of the thickness of the side wall of the lower cover body. The advantages are that: when the distance A is smaller than 2 parts of the thickness of the side wall of the lower cover body, the bonding strength between the second clamping part and the second clamping groove is too small, and the sealing cover body is easy to fall off when the battery cell expands; when the distance A is larger than 3 times of the thickness of the side wall of the lower cover body, the second clamping part is easy to interfere with the installation of the battery cell, and the installation is influenced; therefore, when the distance A is 2-3 times of the thickness of the side wall of the lower cover body, the overall comprehensive performance is stronger.

Compared with the prior art, the beneficial effect of this application lies in:

(1) under the effect of first joint portion, realization that can relax and the lock between the upper cover body, simple structure, rationally distributed, ingenious, and assemble portably, efficient, simultaneously second joint portion can adopt spinning mode integrated into one piece, simple structure, and processing is convenient.

(2) Under the action of the mounting groove, the buffer gasket can be effectively limited and fixed; under the action of the buffer washer, the lower cover body can be effectively buffered and damped, and the overall shock resistance and pressure resistance of the lower cover body and the battery steel shell are improved; meanwhile, under the action of the convex ribs, the strength of the lower cover body can be effectively improved, and the strength of the lower cover body is prevented from being reduced due to the installation groove; therefore, the battery lower cover has strong deformation resistance, is not easy to deform in the use process, and has high precision.

Drawings

Fig. 1 is a perspective view of a high-strength battery steel case provided by the present application.

Fig. 2 is an exploded view of the steel can of the high-strength battery in fig. 1 provided in the present application.

Fig. 3 is a cross-sectional view of the high strength battery steel can of fig. 1 provided herein.

Fig. 4 is a partial enlarged view at I in fig. 3 provided herein.

Fig. 5 is a partial enlarged view of fig. 3 at II provided herein.

Fig. 6 is a partial enlarged view at III in fig. 3 provided herein.

In the figure: 1. an upper cover body; 11. sealing the cover body; 111. a first card slot; 112. a second card slot; 113. a tearing groove; 12. a buffer cover body; 121. a first clamping part; 122. a puncture section; 123. an exhaust hole; 13. a buffer chamber; 2. a lower cover body; 21. a second clamping part; 22. a rib is protruded; 23. mounting grooves; 3. an insulating seal ring; 4. a cushion washer; 41. a rectangular section; 42. a circular segment; 43. a first groove; 44. a second groove.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1 to 6, an embodiment of the present application provides a high-strength battery steel case, including an upper cover body 1, a lower cover body 2, and an insulating sealing ring 3, where the upper cover body 1 includes a sealing cover body 11 with an open lower end and a buffering cover body 12 with an open upper end; a first clamping groove 111 with an annular structure is formed in the upper end of the inner side wall of the sealing cover body 11, a second clamping groove 112 with an annular structure is formed in the lower end of the outer side wall of the sealing cover body 11, and an S-shaped structure is formed on a vertical section between the first clamping groove 111 and the second clamping groove 112; the upper end of the buffering cover body 12 is bent outwards along the circumferential direction to form a first clamping portion 121 with an annular structure, the first clamping portion 121 is clamped in the first clamping groove 111, and a buffering cavity 13 is formed between the buffering cover body 12 and the sealing cover body 11; the upper end of the lower cover body 2 is bent inwards along the circumferential direction to form a second clamping portion 21 with an annular structure, and the second clamping portion 21 is clamped in the second clamping groove 112; the insulating sealing ring 3 is disposed between the second fastening portion 21 and the second fastening groove 112, so that the upper cover 1 and the lower cover 2 are separated from each other to form a seal.

Under the action of the first clamping portion 121 and the first clamping groove 111, the buffer cover 12 is only required to be buckled into the sealing cover 11 from bottom to top, and a buffer cavity 13 can be formed between the buffer cover 12 and the sealing cover 11; under the action of the first clamping portion 121 and the second clamping groove 112, the upper end of the lower cover body 2 can be sealed by only sleeving the insulating seal ring 3 in the first clamping groove 111 and then buckling and pressing the seal cover body 11 to the upper end of the lower cover body 2 from top to bottom, so that the sealing performance of the battery steel shell is improved; meanwhile, the lower cover body 2 and the sealing cover body 11 are separated by the insulating sealing ring 3 to play an insulating role; whole assembly process easy operation, assembly efficiency is high, and first joint portion 121, second joint portion 21, first draw-in groove 111 and second draw-in groove 112 all can adopt spinning mode integrated into one piece, simple structure, and the overall arrangement is ingenious, and processing is convenient. In addition, under the effect of buffering cavity 13 (as shown in fig. 3), when the inside electric core of lower lid 2 takes place to expand, can make buffering lid 12 sunken to buffering cavity 13 inside, take place deformation to absorb most energy when falling the electric core inflation, simultaneously, make the space grow on lower lid 2 upper portion, so that accomodate expanded electric core, thereby can avoid the explosion, improved explosion-proof performance.

Referring to fig. 4 and 5, in some embodiments of the present disclosure, an air vent 123 penetrates through between the upper end of the buffer cover 12 and the first clamping portion 121, and an inner sidewall of the sealing cover 11 forms a seal with the air vent 123; a puncture part 122 is arranged at the middle part of the inner bottom surface of the buffer cover body 12, and the height of the puncture part 122 is D; the thickness of the sealing cover body 11 is E, and D is more than or equal to E and less than or equal to 1.5E; the distance between the inner bottom surface of the buffering cover body 12 and the inner top surface of the sealing cover body 11 is F, and F is more than or equal to 1.5D and less than or equal to 3D. Under normal working conditions, the inner side wall of the sealing cover body 11 forms a seal for the exhaust hole 123, so that the buffer chamber 13 is separated from the interior of the lower cover body 2; when the buffer cover body 12 deforms to a certain degree into the buffer cavity 13, the gap between the exhaust hole 123 and the inner side wall of the sealing cover body 11 is increased, so that the gas in the lower cover body 2 can enter the buffer cavity 13 through the exhaust hole 123, and the pressure relief effect is achieved; after the upper end of the puncturing part 122 punctures the sealing cover body 11, the high-pressure gas entering the interior of the buffer cavity 13 can be discharged to the exterior of the sealing cover body 11, and the interior of the lower cover body 2 is further decompressed, so that the explosion-proof performance is improved; and when D is more than or equal to E and less than or equal to 1.5E and F is more than or equal to 1.5D and less than or equal to 3D, the overall explosion-proof performance is more excellent.

Referring to fig. 3 and 5, in some embodiments of the present application, an annular-structured tear groove 113 is provided on the inner top surface of seal cover body 11, tear groove 113 is disposed on the inner side of cushioning cover body 12, and tear groove 113 is disposed on the outer side of piercing portion 122. Under the action of the tearing groove 113, when the puncture part 122 punctures the sealing cover body 11, the upper edge of the sealing cover body 11 is broken along the tearing groove 113, which is beneficial to improving the pressure relief efficiency of the inner part of the lower cover body 2, thereby further improving the integral explosion-proof performance; moreover, the depth of the tearing groove 113 can be reasonably controlled, so that the force of breaking the sealing cover body 11 along the tearing groove 113 is greater than the force of breaking the sealing cover body 11 by the puncturing part 122, and after the sealing cover body 11 is punctured by the puncturing part 122, the sealing cover body 11 is broken along the tearing groove 113 again, at this time, the broken material on the sealing cover body 11 still remains on the puncturing part 122, so that the broken material can be prevented from flying out, the height of the puncturing part 122 is equivalently reduced, and the damage capability of the puncturing part 122 to other structures is reduced. Since tear groove 113 is located inside cushioning cover 12 and outside piercing part 122, after sealing cover 11 is broken, cushioning cover 12 is prevented from flying out through the broken opening in sealing cover 11, and simultaneously, cushioning cover 12 blocks the lower end of the broken opening to restrict waste material entering cushioning chamber 13 through exhaust hole 123 from being discharged to the outside through the broken opening, resulting in higher overall safety.

Referring to fig. 4, in some embodiments of the present application, the bottom wall and the side wall of the buffering cover 12 are in rounded transition, and an included angle α between the bottom wall and the side wall of the buffering cover 12 is 120-150 °. The deformation benefit of the buffer cover body 12 can be improved, and the pressure generated when the battery cell expands can be effectively offset.

Referring to fig. 4, in some embodiments of the present disclosure, a distance C between an outer end of the first clamping portion 121 and an inner sidewall of the first clamping groove 111 along a horizontal direction is 0.5-1.0 mm. Under the effect of the distance C, when the buffer cover 12 deforms, the first clamping portion 121 further displaces towards the inside of the first clamping groove 111, so that a part of capacity of cell expansion is further offset; meanwhile, the first clamping portion 121 and the first clamping groove 111 are combined more firmly, so that the buffer cover body 12 is effectively prevented from flying out through a broken opening in the seal cover body 11, and the safety is higher.

Referring to fig. 2, 3 and 6, in some embodiments of the present application, a cushion washer 4 of a ring structure is further included; a convex rib 22 with an annular structure is arranged between the inner bottom surface and the inner side surface of the lower cover body 2; an installation groove 23 with an annular structure is arranged between the lower end surface and the outer side surface of the lower cover body 2, and the buffer gasket 4 is embedded in the installation groove 23; the lower end surface of the cushion washer 4 is located below the lower cover 2, and the outer side surface of the cushion washer 4 is located outside the lower cover 2. Under the action of the mounting groove 23, the buffer gasket 4 can be effectively limited and fixed; under the action of the buffer washer 4, the lower cover body 2 can be effectively buffered and damped, and the overall shock resistance and pressure resistance of the lower cover body 2 and the battery steel shell are improved; meanwhile, under the action of the convex rib 22, the strength of the lower cover body 2 can be effectively improved, and the strength of the lower cover body 2 is prevented from being reduced due to the installation groove 23. Therefore, the lower cover body 2 has strong deformation resistance, is not easy to deform in the using process and has high precision.

Referring to fig. 6, in some embodiments of the present disclosure, a distance G between a lower end surface of the cushion ring 4 and a lower end surface of the lower cap 2 is 0.5 to 1.0mm, and a distance H between an outer side surface of the cushion ring 4 and an outer side surface of the lower cap 2 is 0.5 to 1.0 mm. When the distance G and/or the distance H is less than 0.5mm, the overall shock resistance and pressure resistance are weaker; when the distance G and/or the distance H is larger than 1.0mm, although the overall shock resistance and pressure resistance can be improved, the size of the buffer gasket 4 is too large, and the installation and the use are influenced; therefore, when the distance G and the distance H are 0.5-1.0 mm, the overall comprehensive performance is stronger.

Referring to fig. 6, in some embodiments of the present application, the vertical section of the cushion washer 4 includes a rectangular section 41 and a circular section 42, the circular section 42 is integrally connected to the upper right corner of the rectangular section 41, and one end of the circular section 42 away from the rectangular section 41 extends to the inside of the rib 22; the upper end of rectangular section 41 is equipped with the first recess 43 that is used for parcel lid 2 lateral wall lower week down, and the right-hand member of rectangular section 41 is equipped with the second recess 44 that is used for parcel lid 2 diapire periphery down. Simple structure, it is rationally distributed, and the combination between buffering packing ring 4 and mounting groove 23 (be lid 2 down promptly) is more firm reliable, is favorable to improving the buffering cushioning effect of buffering packing ring 4.

Referring to fig. 4, in some embodiments of the present application, a distance a between an end of the second fastening portion 21 away from the lower cover 2 and an inner side surface of the lower cover 2 is 2.0 to 3.0 times of a thickness of a side wall of the lower cover 2. When the distance a is smaller than 2 parts of the side wall thickness of the lower cover body 2, the bonding strength between the second clamping portion 21 and the second clamping groove 112 is too small, and the sealing cover body 11 is easy to fall off when the battery cell expands; when the distance a is greater than 3 times of the thickness of the side wall of the lower cover body 2, the second clamping portion 21 easily interferes with the installation of the battery cell, and the installation is affected; therefore, when the distance A is 2-3 times of the thickness of the side wall of the lower cover body 2, the overall comprehensive performance is stronger.

Referring to fig. 4, in some embodiments of the present application, the lower end of the insulating sealing ring 3 is wrapped around the lower end of the sealing cap body 11, and the upper end of the insulating sealing ring 3 is wrapped around the second clamping portion 21; the outer side surface of the lower cover body 2 is flush with the outer side surface of the sealing cover body 11; the outer side surface of the insulating seal ring 3 is positioned on the outer side of the lower cover body 2, and the distance B between the outer side surface of the insulating seal ring 3 and the outer side surface of the lower cover body 2 is 0.5-1.0 mm. The gap between the second clamping portion 21 and the second clamping groove 112 is effectively sealed through the insulating sealing ring 3, so that the sealing performance is further improved, the lower cover body 2 and the sealing cover body 11 are effectively separated, and the insulating performance between the lower cover body and the sealing cover body is further improved.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (4)

1. A high-precision battery lower cover comprises a lower cover body and is characterized by further comprising a buffer gasket with an annular structure; the upper end of the lower cover body is bent inwards along the circumferential direction to form a second clamping part with an annular structure; a convex rib with an annular structure is arranged between the inner bottom surface and the inner side surface of the lower cover body; an installation groove of an annular structure is arranged between the lower end surface and the outer side surface of the lower cover body, and the buffer gasket is embedded in the installation groove; the lower end face of the buffer gasket is located below the lower cover body, and the outer side face of the buffer gasket is located on the outer side of the lower cover body.

2. The lower cover for a high precision battery as claimed in claim 1, wherein the distance G between the lower end surface of the cushion washer and the lower end surface of the lower cover is 0.5 to 1.0mm, and the distance H between the outer side surface of the cushion washer and the outer side surface of the lower cover is 0.5 to 1.0 mm.

3. The lower cover for the high-precision battery as claimed in claim 1, wherein a distance a between an end of the second clamping portion that is offset from the lower cover body and an inner side surface of the lower cover body is 2.0 to 3.0 times a thickness of a side wall of the lower cover body.

4. A high-precision battery lower cover as claimed in any one of claims 1 to 3, wherein the vertical section of the cushion washer comprises a rectangular section and a circular section, the circular section is integrally connected to the upper right corner of the rectangular section, and one end of the circular section, which is far away from the rectangular section, extends to the inside of the convex rib; the upper end of the rectangular section is provided with a first groove used for wrapping the lower periphery of the side wall of the lower cover body, and the right end of the rectangular section is provided with a second groove used for wrapping the periphery of the bottom wall of the lower cover body.

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