CN216436004U - Button type lithium ion battery and combined cover suitable for button type lithium ion battery - Google Patents
Button type lithium ion battery and combined cover suitable for button type lithium ion battery Download PDFInfo
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- CN216436004U CN216436004U CN202122753978.3U CN202122753978U CN216436004U CN 216436004 U CN216436004 U CN 216436004U CN 202122753978 U CN202122753978 U CN 202122753978U CN 216436004 U CN216436004 U CN 216436004U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model relates to a lithium ion battery field discloses a lithium ion battery and be applicable to lithium ion battery's combined cover. The combined cover includes: the outer plate of the metal cover is provided with a first through hole, colloid is embedded into each first through hole, and the colloid in each first through hole and the inner wall of the first through hole are hermetically assembled with the first sealing film and the second sealing film respectively. The technical scheme is beneficial to improving the sealing reliability of the button type lithium ion battery.
Description
Technical Field
The utility model relates to a lithium ion battery makes the field, especially relates to a knot formula lithium ion battery and be applicable to knot formula lithium ion battery's combined cover.
Background
With the wider application of intelligent wearable products, people have wider and wider requirements on small-size lithium ion button type secondary rechargeable batteries (button type lithium ion batteries for short). Button lithium ion battery is more and more being applied to intelligence wearing product, for example be used for wireless bluetooth headset etc. along with button lithium ion battery's application is more and more wide, for example earphone etc. also more and more high to the requirement of battery.
In order to meet the design requirements of the wearable product, better use experience is brought to people, and higher requirements are provided for the button type lithium ion battery.
The inventor is carrying out the utility model discloses the research in-process discovery adopts the totally enclosed knot formula lithium ion battery of hot combined structure's combination apron, and this type battery metal covering inner panel edge and air contact use or deposit for a long time, and inside steam in the air probably entered into the battery from the edge of metal covering inner panel, and then steam can destroy the sealing performance of apron, brought the weeping risk for the battery. Especially when stored and circulated, there is a risk of leakage.
Disclosure of Invention
An object of the embodiment of the utility model is to provide a knot formula lithium ion battery and be applicable to knot formula lithium ion battery's combined cover, use this technical scheme to be favorable to improving knot formula lithium ion battery's sealing reliability.
In a first aspect, an embodiment of the present invention provides a combined cover suitable for button type lithium ion battery, include: a first sealing rubber sheet, a metal cover outer plate, a second sealing rubber sheet and a metal cover inner plate which are sequentially stacked face to face,
the periphery of the metal cover outer plate exceeds the peripheries of the first sealing rubber sheet, the second sealing rubber sheet and the metal cover inner plate, the laminated opposite surfaces are sealed and combined into a whole, the metal cover outer plate, the first sealing rubber sheet and the second sealing rubber sheet are annular, the sealing rubber sheets of the first sealing rubber sheet and the second sealing rubber sheet which exceed the central through hole of the metal cover outer plate are sealed and combined into a whole,
a first through hole is arranged on the surface of the metal cover outer plate, which is attached to the first sealing rubber sheet and the second sealing rubber sheet,
and the colloid in each first through hole is embedded into the first through hole, and the colloid in each first through hole and the inner wall of the first through hole where the colloid is located are in a sealed assembly and are respectively connected with the first sealing rubber sheet and the second sealing rubber sheet into a whole.
Optionally, the method further comprises: an annular third sealing rubber sheet which is hermetically combined on the top surface of the inner plate of the metal cover,
the top surface of the inner plate of the metal cover is exposed out of the central through hole of the third sealing rubber sheet,
and the sealing rubber sheets of the second sealing rubber sheet beyond the metal inner cover plate are sealed and combined into a whole.
Optionally, a second through hole is arranged on the surface of the inner plate of the metal cover, which is attached to the second sealing rubber sheet and the third sealing rubber sheet,
and colloid is embedded into each second through hole, and the colloid in each second through hole is hermetically assembled with the inner wall of the second through hole where the colloid is positioned and is respectively connected with the second sealing rubber sheet and the third sealing rubber sheet into a whole.
Optionally, the glue on the surfaces of the first sealing film and the second sealing film is heated and melted to be respectively combined with the surfaces of the metal cover outer plates which are attached to each other into a whole,
the colloid on the surfaces of the second sealing rubber sheet and the third sealing rubber sheet is heated and melted to be combined with the surfaces of the inner plates of the metal covers which are attached to each other into a whole.
Optionally, the first sealing film, the second sealing film and the third sealing film are integrally formed on two surfaces of the outer metal cover plate and the inner metal cover plate in an injection molding manner, the first sealing film, the second sealing film and the two surfaces of the outer metal cover plate are combined into a whole in a sealing manner, and the second sealing film, the third sealing film and the two surfaces of the inner metal cover plate are combined into a whole in a sealing manner.
Optionally, a liquid injection hole is further formed in the metal cover inner plate and located in a central through hole of the metal cover outer plate, the first sealing film, the second sealing film and the third sealing film.
In a second aspect, an embodiment of the present invention provides a button type lithium ion battery, including:
the laminated sheet body or the winding body comprises a first pole piece and a second pole piece, a diaphragm is arranged between every two adjacent first pole pieces and second pole pieces at intervals, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece;
an electrolyte within pores within each of the first and second pole pieces and separator within the lamination or winding and between gaps between any two of the first pole pieces, second pole pieces, separator;
the sealing shell, the laminated body or the winding body and the electrolyte are sealed in the sealing shell formed by the metal shell and the combined cover,
the periphery of the metal cover outer plate of the combined cover is fused and sealed with the metal material at the opening of the metal shell, the inner surface of the metal cover inner plate facing the inside of the sealed shell is electrically connected with the tab of the first pole piece of the laminated body or the wound body, the metal cover inner plate is used as a first electrode of the battery,
the metal cover outer plate or the metal shell is electrically connected with the tab of the second pole piece of the laminated body or the wound body, and the metal cover outer plate is used as a second electrode of the battery.
Optionally, a liquid injection hole is further formed in the inner metal cover plate and is located in a central through hole of the outer metal cover plate, the first sealing film, the second sealing film and the third sealing film;
the top surface of the metal cover inner plate, which is exposed out of the central through hole of the third sealing film, is also provided with a metal sealing nail, the bottom surface of the metal sealing nail and the top surface of the metal cover inner plate are fused and sealed together, and the liquid injection hole is sealed on the bottom surface of the metal sealing nail.
Optionally, an explosion-proof part is arranged on the metal shell, and the thickness of the shell wall at the explosion-proof part is 10% -50% of the thickness of the shell wall of the metal shell.
Optionally, the width of the explosion-proof part is 0.05-0.2 mm.
It can be seen from the above that, the periphery of the combined cover of the button lithium ion battery of this embodiment and the edge of the opening of the metal shell combine into an integrated sealing connection through high temperature, for the technical scheme that sealing connection is realized by the upper and lower metal shells being sleeved inside and outside and compressing the sealing ring between the upper and lower metal shells in the prior art, the sealing connection of this embodiment is more reliable, which is beneficial to further reducing or avoiding the leakage risk after the button lithium ion battery is stored or circulated, and improves the reliability and the safety of the button lithium ion battery.
In addition, the top of the metal cover inner plate of the combined cover of the embodiment is further covered with a third sealing film, the third sealing film and the second sealing film seal the outer edge of the metal cover inner plate in the metal cover inner plate from the periphery of the metal cover inner plate, and the first sealing film and the second sealing film seal the inner edge of the metal cover outer plate in the metal cover outer plate from the inner edge of the metal cover outer plate, so that the sealing performance of the combined cover is enhanced, and the sealing performance of the button type lithium ion battery is improved.
In addition, through holes are further formed in the metal cover inner plate and/or the metal cover outer plate, and the sealing colloid on the two surfaces of the metal cover inner plate and/or the metal cover outer plate is embedded into the through holes respectively to be connected into a whole, namely the sealing colloid on the two surfaces of the metal cover inner plate and/or the metal cover outer plate is used for meshing and fixing the metal cover inner plate and/or the metal cover outer plate in the through holes, so that the reliability of sealing and combining between the sealing rubber sheet and the metal cover inner plate and/or the metal cover outer plate is greatly improved, and the metal cover inner plate and/or the metal cover outer plate is prevented from being separated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute an undue limitation on the invention.
Fig. 1 is a schematic view of an assembly structure of a button-type lithium ion battery provided in an embodiment of the present invention.
Fig. 2 is a schematic view of a three-dimensional structure of another button-type lithium ion battery provided in an embodiment of the present invention.
Reference numerals:
1: a metal housing; 11: an explosion-proof part;
21: a metal cover outer plate; 22: a metal cover inner plate;
31: a first sealing film; 32: a second sealing film; 33: a third sealing film;
41: a first through hole; 42: a second through hole;
26: a liquid injection hole; 27: and (4) a metal sealing nail.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1
See fig. 1-2.
This embodiment provides a button lithium ion battery, and it mainly includes: a laminate or a roll (not shown), wherein the laminate is formed by a lamination process. The winding body is manufactured by adopting a winding process, and the laminated sheet body (or the winding body) mainly comprises a first pole piece, a second pole piece and a diaphragm layer which is arranged between the first pole piece and the second pole piece which are adjacent at intervals, wherein one of the first pole piece and the second pole piece is a positive pole piece, and the other one is a negative pole piece.
The electrolyte may be a solid electrolyte or may be, but is not limited to, an electrolytic solution. When the electrolyte is used, the electrolyte is soaked in the laminated body (or the wound body) to be filled in the pores in the first pole piece, the second pole piece and the diaphragm in the laminated body (or the wound body), and to be filled in the gap between any adjacent two of the first pole piece, the second pole piece and the diaphragm.
The laminate (or roll) and the electrolyte impregnated therein are sealed in a sealed housing. The sealed shell is composed of a metal shell 1 and a combined cover, and the metal shell 1 can be but is not limited to a steel shell or an aluminum shell. The metal shell 1 is a cavity, an opening is arranged on the top of the metal shell 1, and the combined cover is sealed on the opening on the top of the metal shell 1 to form a sealed shell.
The composite cover of the present embodiment includes a metal cover outer plate 21 and a metal cover inner plate 22 made of metal materials, and a first sealing rubber sheet 31, a second sealing rubber sheet 32, and a third sealing rubber sheet 33 made of insulating rubber.
The metal cover outer plate 21, the first sealing film 31, the second sealing film 32 and the third sealing film 33 are all in the shape of a ring with a central through hole in the center. The metal cover inner plate may be a flat plate having a liquid inlet 26 provided therethrough at the center thereof, or a flat plate having no through hole at the center thereof.
The outer diameter of the metal cover outer plate 21 is larger than the outer diameters of the first sealing rubber sheet 31, the second sealing rubber sheet 32 and the metal cover inner plate 22, and the periphery of the metal cover outer plate 21 exceeds the peripheries of the first sealing rubber sheet 31 and the second sealing rubber sheet 32. The inner diameter of the metal cover outer plate 21 is narrower than the inner diameters of the first sealing rubber sheet 31 and the second sealing rubber sheet 32, and the inner edges of the first sealing rubber sheet 31 and the second sealing rubber sheet 32 exceed the central through hole of the metal cover outer plate 21. Wherein, but not limited to, the inner diameters of the first sealing film 31 and the second sealing film 32 are set to be the same, so that the inner edges of the first sealing film and the second sealing film are opposite and flush beyond the inner edges of the central through hole of the metal cover outer plate 21.
The diameter of the metal cover inner plate 22 is larger than the inner diameters of the second sealing rubber sheet 32 and the third sealing rubber sheet 33, and is smaller than the outer diameters of the metal cover outer plate 21, the second sealing rubber sheet 32 and the third sealing rubber sheet 33. The top surface of the inner metal cover plate 22 is exposed from the central through hole of the third sealing rubber sheet 33, and the outer periphery of the inner metal cover plate 22 is covered in the second sealing rubber sheet 32 and the third sealing rubber sheet 33.
In the combined cover, a first sealing rubber sheet 31, a metal cover outer plate 21, a second sealing rubber sheet 32, a metal cover inner plate 22 and a third sealing rubber sheet 33 are sequentially laminated into a whole. The central through holes of the first sealing rubber sheet 31, the metal cover outer plate 21 and the second sealing rubber sheet 32 are opposite, the first sealing rubber sheet 31 and the second sealing rubber sheet 32 which are tightly attached to the two surfaces of the metal cover outer plate 21 are respectively combined with the two surfaces of the metal cover outer plate 21 in a sealing mode into a whole, the rubber bodies which exceed the surfaces of the first sealing rubber sheet 31 and the second sealing rubber sheet 32 in the central through holes of the metal cover outer plate 21 are fully combined into a whole, and the inner edge of the metal cover outer plate 21 is wrapped between the first sealing rubber sheet 31 and the second sealing rubber sheet 32 in a sealing mode.
The metal cover inner plate 22 is tightly attached to the top surface of the second sealing rubber sheet 32, the bottom surface of the metal cover inner plate 22 is combined with the top surface of the second sealing rubber sheet 32 in a sealing mode, and the second sealing rubber sheet 32 provides insulation for the metal cover inner plate 22 and the metal cover outer plate 21 and combines the metal cover inner plate and the metal cover outer plate into a whole. The third sealing film 33 is tightly adhered to the top surface of the metal cover inner plate 22, and the top surface of the metal cover inner plate 22 exposed from the central through hole of the third sealing film 33 is used as an electrode of the button type lithium ion battery. The colloid on the surfaces of the second sealing rubber sheet 32 and the third sealing rubber sheet 33, which exceed the periphery of the metal cover inner plate 22, is fully fused into a whole, and the inner edge of the metal cover inner plate 22 is hermetically wrapped between the second sealing rubber sheet 32 and the third sealing rubber sheet 33.
The sealing combination of the combined cover of the embodiment can be realized by, but not limited to, thermal compounding, and under high temperature and certain pressure, the colloids on the surfaces of the first sealing rubber sheet 31 and the second sealing rubber sheet 32 are fully melted and fully combined on the surface of the metal cover outer plate 21, and the hot melt colloids on the surfaces of the first sealing rubber sheet 31 and the second sealing rubber sheet 32 exceeding the central through hole of the metal cover outer plate 21 are fully fused and combined into a whole, and the hot melt adhesives are solidified and formed to obtain an integrated structure after standing or cooling; similarly, under high temperature and a certain pressure, the adhesive on the surfaces of the second sealing film 32 and the third sealing film 33 is fully melted and fully contacted with and bonded to the surface of the metal cover inner plate 22, and the hot melting adhesive on the surfaces of the second sealing film 32 and the third sealing film 33 which exceed the periphery of the metal cover inner plate 22 is fully fused and bonded into a whole, and the hot melting adhesive is solidified and molded after standing or cooling to obtain an integrated structure. The composite cover is bonded together by a second sealant 32 having both surfaces sealingly bonded to the top surface of the metal cover outer panel 21 and the bottom surface of the metal cover inner panel 22, respectively. The thermal compounding process has the advantages of low process cost and easy realization.
In addition, the combined cover can also be integrally injection-molded by adopting an injection molding process but not limited to. The metal cover outer plate 21 and the metal cover inner plate 22 are placed into a preset injection mold, hot-melt glue is injected into the injection mold by injection molding equipment, the hot-melt glue fully enters a mold cavity with a preset shape, which is preset on the two surfaces of the metal cover outer plate 21 and the metal cover inner plate 22, and fully contacts with the metal cover outer plate 21 and the metal cover inner plate 22 to realize sealing combination, and the combined cover formed by injection molding at one time on the metal cover outer plate 21 and the metal cover inner plate 22 is obtained after the hot-melt glue is cooled and formed. The injection molding cost is adopted, and the combined cover has the advantages of high work efficiency, firm integrated structure and high consistency.
As an illustration of the present embodiment, a plurality of first through holes 41 may be provided in the area of the metal cover outer panel 21 facing the first sealing rubber sheet 31 and the second sealing rubber sheet 32, and the first through holes 41 may be uniformly arranged in the metal cover outer panel 21. The glue bodies on the surfaces of the first sealing film 31 and the second sealing film 32 extend into the first through hole 41, the glue bodies filling the first through hole 41 are combined with the inner wall of the first through hole 41 in a sealing manner, and are combined with the glue bodies on the surfaces of the first sealing film 31 and the second sealing film 32 at the opposite ends of the two sides of the first through hole 41. The first sealing rubber sheet 31 and the second sealing rubber sheet 32 are connected into a whole through the first through hole 41 on the metal cover outer plate 21 between the first sealing rubber sheet 31 and the second sealing rubber sheet 32, so that the connection tightness between the first sealing rubber sheet 31 and the metal cover outer plate 31 is improved, the reliability of sealing combination is improved, and the separation is avoided.
Similarly, a plurality of second through holes 42 are provided in the area of the metal cover inner plate 22 facing the second sealing rubber sheet 32 and the third sealing rubber sheet 33, and the second through holes 42 are uniformly arranged on the metal cover inner plate 22. The colloid on the surfaces of the second sealing rubber sheet 32 and the fourth sealing rubber sheet 33 penetrates through the second through holes 42 which are opposite to each other and is combined with the inner walls of the second through holes 42 into a whole in a sealing way. The glue filling the second through holes 42 is integrated with the glue on the surfaces of the second sealing rubber sheet 32 and the third sealing rubber sheet 33 on both sides of the second through holes 42. The second sealing rubber sheet 32 and the third sealing rubber sheet 33 are connected into a whole through the second through hole 42 between the second sealing rubber sheet 32 and the third sealing rubber sheet 33, the connection tightness between the second sealing rubber sheet 32 and the third sealing rubber sheet 33 and the metal cover inner plate 32 is improved, the reliability of sealing combination is improved, and separation is avoided.
The glue on the two surfaces of the second sealing rubber sheet 32 respectively penetrates through the first through hole 41 and the second through hole 42 of the metal cover outer plate 21 and the metal cover inner plate 22, and is respectively combined with the glue on the surfaces of the first sealing rubber sheet 31 and the third sealing rubber sheet 33 into a whole, so that the integrated combination connection of the combined cover is realized.
Wherein the shape of the first through hole 41 and the second through hole 42 may be circular or elliptical or other irregular patterns. The first through holes 41 and the second through holes 42 are uniformly distributed, and may be, but not limited to, uniformly arranged on the metal cover outer plate 31 and the metal cover inner plate 32 in a concentric circle shape.
As an illustration of the present embodiment, when the combined cover of the present embodiment is manufactured by using a thermal compounding process, under thermal compounding, the glue on the surfaces of the first sealing glue film 31, the second sealing glue film 32, and the third sealing glue film 33 is heated and melted, the melted glue under pressure enters the first through hole 41 and the second through hole 42 respectively, and fully contacts the inner walls of the first through hole 41 and the second through hole 42, and the temperature and pressure of thermal compounding are controlled, so that the melted glue on the two sides of the first through hole 41 and the second through hole 42 fully fills the first through hole 41 and the second through hole 42, and is fully melted together, thereby combining the sealing glue on the two sides of the outer metal cover plate 31 and the inner metal cover plate 32 into an integrated structure.
When the combined cover of the present embodiment is manufactured by using an injection molding process, under the action of injection pressure, molten glue injected into the two surfaces of the outer metal cover plate 31 and the inner metal cover plate 32 to form the first sealing glue film 31, the second sealing glue film 32 and the third sealing glue film 33 is fully filled in the first through hole 41, the second through hole 42 and the inner wall of the through hole to be fully contacted, and is fully fused with the molten glue at the two sides of the through hole, and after cooling molding, the glue embedded in the first through hole 41 and the second through hole 42 and the sealing glue at the two sides are integrally injection molded.
When button-type lithium ion assembly is performed, a first tab (connected with a first pole piece) on the lamination body (or the winding body) is connected to the bottom surfaces of the metal cover inner plate 22 exposed in the central through holes of the first sealing rubber sheet 31 and the second sealing rubber sheet 32 which are combined together, and the metal cover inner plate 22 is used as a first electrode of the lithium ion battery.
The second tab (connected to the second tab) of the laminated body (or the wound body) is connected to the surface of the metal cap outer plate 21 facing the inside of the sealed case or at any position of the metal case 1, and the metal cap outer plate 21 and the metal case 1 are used as the second electrode of the lithium ion battery. Wherein one of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.
After the first electrode and the second electrode are connected with the metal cover outer plate 21 and the metal cover inner plate 22, the combined cover is covered on the opening of the metal shell 1, the contact position of the metal cover outer plate 21 and the opening of the metal shell 1 is subjected to laser welding, so that metal materials at the contact position are fused and combined into a whole, the sealed connection between the combined cover and the metal shell 1 is realized, and the laminated body (or the wound body) is sealed in the sealed space.
The periphery of the combined cover of the button type lithium ion battery and the edge of the opening of the metal shell 1 are fused and combined into integrated sealing connection through high temperature, and compared with the technical scheme that the sealing connection is realized by the sealing ring between the upper metal shell and the lower metal shell 1 in the prior art through internal and external sleeving and compression, the sealing connection of the technical scheme is more reliable, the leakage risk of the button type lithium ion battery after storage or circulation is favorably reduced or avoided, and the reliability and the safety of the button type lithium ion battery are improved.
In addition, in the combined cover of the embodiment, the top of the metal cover inner plate 22 is further covered with a third sealing film 33, the third sealing film 33 and the second sealing film 32 seal the outer edge of the metal cover inner plate 22 in the metal cover inner plate 22 from the periphery of the metal cover inner plate 22, and the first sealing film 31 and the second sealing film 32 seal the inner edge of the metal cover outer plate 21 in the metal cover outer plate 21 from the inner edge of the metal cover outer plate 21, so that the sealing performance of the combined cover is enhanced, and the additional sealing performance of the lithium ion battery is improved.
As an illustration of the present embodiment, the electrolyte of the present embodiment can be, but is not limited to, an electrolyte solution. When the electrolyte is used, the electrolyte can be infiltrated into the laminated body (or the wound body) before the combined cover is sealed, the laminated body (or the wound body) is assembled into the metal shell 1 after infiltration, and then the combined cover is sealed.
In addition, a liquid filling hole 26 may be provided at the center of the metal lid inner plate 22 of the composite lid, the liquid filling hole 26 is positioned in the through hole at the center of the first gasket 31, the second gasket 32 and the metal lid outer plate 21 to communicate with the inside of the sealed case, and the outer diameter of the liquid filling hole 26 is smaller than the inner diameter of the third gasket 33 to be positioned in the third gasket 33. Thus, the laminated body (or the wound body) which is not soaked with the electrolyte can be assembled into the metal shell 1, the combined cover is sealed, the electrolyte is injected, and the electrolyte injection hole 26 is sealed, so that the button type lithium ion battery is obtained. By adopting the technical scheme of sealing the combined cover and injecting liquid, poor welding caused by pollution of electrolyte to the laser welding position between the outer metal cover plate 21 and the opening of the metal shell 1 is avoided.
After liquid injection, the metal sealing nail 27 is laser welded on the top surface of the metal cover inner plate 22, a closed annular laser welding track surrounding the periphery of the liquid injection hole 26 is formed on the metal sealing nail 27, and the metal sealing nail 27 and the metal material of the metal cover inner plate 22 are fused, sealed and combined into a whole under the high-temperature action of laser at the laser welding track, so that the sealing of the liquid injection hole 26 is realized.
As an illustration of the present embodiment, an explosion-proof portion 11 is disposed on the metal shell of the present embodiment, and a thickness of a shell wall of the explosion-proof portion is thinner than a thickness of the metal shell at other positions, and the thickness of the shell wall of the explosion-proof portion is about 10% to 50% of the thickness of the shell wall of the metal shell.
As an illustration of the present embodiment, the explosion-proof portion 11 may be formed on the metal case by, but not limited to, a laser scribe method, and the laser welding line depth may be controlled by controlling the intensity of the laser and the welding time. The width of the laser scribing line can be but is not limited to 0.05-0.2 mm. The laser scribe lines formed can be, but not limited to, straight lines or curved lines, one or more laser scribe lines can be formed, the length of the formed laser scribe lines is not limited, and the laser scribe lines can be closed laser scribe lines or open laser scribe lines. The laser scribe lines formed may be, but are not limited to being, formed on the inner surface of the bottom of the metal housing. By adopting the design of the explosion-proof part 11, the use safety of the button lithium ion battery of the embodiment is greatly improved, so that when the air pressure inside the button lithium ion battery reaches a certain air pressure, the explosion-proof part 11 is firstly punctured, and the explosion or fire of the battery caused by the accumulation of the air pressure is avoided.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A combined cover suitable for a button type lithium ion battery is characterized by comprising: a first sealing rubber sheet, a metal cover outer plate, a second sealing rubber sheet and a metal cover inner plate which are sequentially stacked face to face,
the periphery of the metal cover outer plate exceeds the peripheries of the first sealing rubber sheet, the second sealing rubber sheet and the metal cover inner plate, the laminated opposite surfaces are sealed and combined into a whole, the metal cover outer plate, the first sealing rubber sheet and the second sealing rubber sheet are annular, the sealing rubber sheets of the first sealing rubber sheet and the second sealing rubber sheet which exceed the central through hole of the metal cover outer plate are sealed and combined into a whole,
a first through hole is arranged on the surface of the metal cover outer plate, which is attached to the first sealing rubber sheet and the second sealing rubber sheet,
and the colloid in each first through hole is embedded into the first through hole, and the colloid in each first through hole and the inner wall of the first through hole where the colloid is located are in a sealed assembly and are respectively connected with the first sealing rubber sheet and the second sealing rubber sheet into a whole.
2. The combination cover suitable for button lithium ion battery as claimed in claim 1,
further comprising: an annular third sealing rubber sheet which is hermetically combined on the top surface of the inner plate of the metal cover,
the top surface of the inner plate of the metal cover is exposed out of the central through hole of the third sealing rubber sheet,
and the sealing rubber sheets of the second sealing rubber sheet beyond the metal inner cover plate are sealed and combined into a whole.
3. The combination cover suitable for button lithium ion battery as claimed in claim 1,
a second through hole is arranged on the surface of the inner plate of the metal cover, which is attached to the second sealing rubber sheet and the third sealing rubber sheet,
and colloid is embedded into each second through hole, and the colloid in each second through hole is hermetically assembled with the inner wall of the second through hole where the colloid is positioned and is respectively connected with the second sealing rubber sheet and the third sealing rubber sheet into a whole.
4. The combination cover of any one of claims 1 to 3, wherein the cover is a cover body of a button-type lithium ion battery,
the colloid on the surface of the first sealing rubber sheet and the colloid on the surface of the second sealing rubber sheet are heated and melted to be respectively combined with the surface of the metal cover outer plate which is attached to the colloid into a whole,
the colloid on the surfaces of the second sealing rubber sheet and the third sealing rubber sheet is heated and melted to be combined with the surfaces of the inner plates of the metal covers which are attached to each other into a whole.
5. The combination cover of any one of claims 1 to 3, wherein the cover is a cover body of a button-type lithium ion battery,
the first sealing film, the second sealing film and the third sealing film are integrally formed by injection molding on two surfaces of the outer metal cover plate and the inner metal cover plate, the first sealing film, the second sealing film and the two surfaces of the outer metal cover plate are combined into a whole in a sealing mode, and the second sealing film, the third sealing film and the two surfaces of the inner metal cover plate are combined into a whole in a sealing mode.
6. The combination cover suitable for button lithium ion battery as claimed in claim 1,
still be provided with on the metal lid inner panel and annotate the liquid hole, it is located to annotate the liquid hole the metal lid planking, first sealed film, the sealed film of second, the sealed film's of third central through hole.
7. A button type lithium ion battery is characterized by comprising:
the laminated sheet body or the winding body comprises a first pole piece and a second pole piece, a diaphragm is arranged between every two adjacent first pole pieces and second pole pieces at intervals, one of the first pole piece and the second pole piece is a positive pole piece, and the other one of the first pole piece and the second pole piece is a negative pole piece;
an electrolyte within pores within each of the first and second pole pieces and separator within the lamination or winding and between gaps between any two of the first pole pieces, second pole pieces, separator;
a sealed case in which the laminated body or the wound body and the electrolytic solution are sealed in the sealed case composed of the metal case and the composite closure of any one of claims 1 to 6,
the periphery of the metal cover outer plate of the combined cover is fused and sealed with the metal material at the opening of the metal shell, the inner surface of the metal cover inner plate facing the inside of the sealed shell is electrically connected with the tab of the first pole piece of the laminated body or the wound body, the metal cover inner plate is used as a first electrode of the battery,
the metal cover outer plate or the metal shell is electrically connected with the tab of the second pole piece of the laminated body or the wound body, and the metal cover outer plate is used as a second electrode of the battery.
8. The lithium ion button cell of claim 7,
the metal cover inner plate is also provided with a liquid injection hole, and the liquid injection hole is positioned in the central through holes of the metal cover outer plate, the first sealing film, the second sealing film and the third sealing film;
the top surface of the metal cover inner plate, which is exposed out of the central through hole of the third sealing film, is also provided with a metal sealing nail, the bottom surface of the metal sealing nail and the top surface of the metal cover inner plate are fused and sealed together, and the liquid injection hole is sealed on the bottom surface of the metal sealing nail.
9. The lithium ion button cell of claim 7,
the metal shell is provided with an explosion-proof part, and the thickness of the shell wall at the explosion-proof part is 10% -50% of the thickness of the shell wall of the metal shell.
10. The lithium ion button cell of claim 9,
the width of the explosion-proof part is 0.05-0.2 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021221600097 | 2021-09-07 | ||
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