CN113937436A - Battery shell and battery - Google Patents
Battery shell and battery Download PDFInfo
- Publication number
- CN113937436A CN113937436A CN202111436229.6A CN202111436229A CN113937436A CN 113937436 A CN113937436 A CN 113937436A CN 202111436229 A CN202111436229 A CN 202111436229A CN 113937436 A CN113937436 A CN 113937436A
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- China
- Prior art keywords
- battery
- hole
- liquid injection
- interposer
- shell
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- 238000002347 injection Methods 0.000 claims abstract description 63
- 239000007924 injection Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000003466 welding Methods 0.000 claims abstract description 30
- 239000003792 electrolyte Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 238000012546 transfer Methods 0.000 description 11
- 229910052759 nickel Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- -1 Polyethylene Polymers 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229920003235 aromatic polyamide Polymers 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 3
- 238000003487 electrochemical reaction Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000889 poly(m-phenylene isophthalamide) Polymers 0.000 description 1
- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 description 1
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/181—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for button or coin cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Filling, Topping-Up Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a battery case and a battery. The invention provides a battery shell, which comprises a shell body and a shell cover, wherein the shell body and the shell cover are connected to form an accommodating cavity; the shell cover is connected with a switching piece in a welding mode, and the liquid injection through hole is located in a welding area formed by welding the switching piece and the shell cover. The liquid injection through hole is directly sealed by the adapter sheet without using a sealing nail, so that the problems in the welding process of the adapter sheet and the sealing nail are solved, and the welding yield of the adapter sheet is improved; meanwhile, the weight of the battery is reduced, and the energy density of the battery is improved.
Description
Technical Field
The invention relates to a battery shell and a battery, and relates to the technical field of batteries.
Background
With the popularization of portable electronic products, the technology of batteries is also continuously developed. The battery can be classified into button cells, cylindrical cells, square cells and special-shaped cells according to the shape. Use button cell as example, including electric core, electrolyte and shell, wherein, the shell includes the holding chamber of being connected formation by casing and cap, and electric core is sealed to be placed at this holding intracavity, and the shell is provided with the notes liquid through-hole that is used for pouring into electrolyte into the holding intracavity.
Generally, a sealing nail is used for blocking an injection through hole in the field, and then an adapter plate is welded at the position of the sealing nail to realize the electric connection between the button cell and an external circuit, however, because the sealing nail is small in size, the adapter plate has the problems of difficult positioning and inaccurate positioning in the welding process, the adapter plate is easily welded badly, and the performance of the button cell is further influenced; in addition, the sealing nails and the adapter pieces are overlapped, so that the weight of the button battery is easily increased, and the energy density of the button battery is influenced.
Disclosure of Invention
The invention provides a battery shell and a battery, which are used for solving the problems of the conventional liquid injection mode.
The invention provides a battery shell, which comprises a shell body and a shell cover, wherein the shell body and the shell cover are connected to form an accommodating cavity;
the shell cover is connected with a switching piece in a welding mode, and one end of the switching piece covers the liquid injection through hole.
In one embodiment, the housing cover comprises a first electrode part, an insulating part and a second electrode part, the second electrode part is connected with the housing, and the insulating part is positioned between the first electrode part and the second electrode part and used for isolating the first electrode part from the second electrode part;
the first electrode part is provided with a first liquid injection through hole, the insulating part is provided with a second liquid injection through hole, and the diameter of the first liquid injection through hole is smaller than that of the second liquid injection through hole;
the adapter sheet is connected with the first electrode part in a welding mode, and the adapter sheet covers the first liquid injection through hole.
In one embodiment, one end of the adapter plate extends to be spaced apart from the housing cover.
In one embodiment, an insulating layer is disposed between one end of the interposer and the housing cover.
In one embodiment, the interposer includes a first interposer and a second interposer connected to each other, the first interposer is welded to the housing cover, and the second interposer is spaced apart from the housing cover.
In one embodiment, an insulating layer is disposed between the second interposer and the housing cover.
In one embodiment, the interposer has a thickness of 0.05 to 0.12 mm.
In one embodiment, the housing cover is provided with a recessed portion recessed towards the accommodating cavity, the liquid injection through hole is formed in the recessed portion, and the recessed depth of the recessed portion is 0.05-0.45 mm.
In one embodiment, the patch comprises a first horizontal part, an inclined part and a second horizontal part which are sequentially connected end to end, wherein the first horizontal part is connected with the depressed part in a welding mode, the second horizontal part is arranged at a distance from the depressed part, and the tail end of the inclined part is higher than the depressed part by 0.1-0.5 mm.
In one embodiment, the diameter of the liquid injection through hole is 1-3mm, the width of the adapter plate is 1.5-9mm, and the width of the adapter plate is greater than or equal to the diameter of the liquid injection through hole.
In one embodiment, the adaptor sheet is provided with a pressure relief groove corresponding to the liquid injection through hole.
The second aspect of the invention provides a battery, which comprises a battery core and any one of the battery shells, wherein the battery core is placed in the accommodating cavity and is connected with the battery shell through a tab.
The liquid injection through hole is directly sealed by the adapter sheet without using a sealing nail, so that the problems in the welding process of the adapter sheet and the sealing nail are solved, and the welding yield of the adapter sheet is improved; meanwhile, the weight of the battery is reduced, and the energy density of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a housing according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of an interposer according to an embodiment of the present invention;
fig. 3 is a schematic welding diagram of an interposer according to an embodiment of the present invention;
FIG. 4 is an exploded view of a housing cover according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an interposer according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 11 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of an interposer according to another embodiment of the present invention;
fig. 13 is a schematic structural diagram of a first rotating sheet according to an embodiment of the present invention;
fig. 14 is a schematic connection diagram of an interposer according to another embodiment of the present invention;
fig. 15 is a schematic structural view of a battery case according to yet another embodiment of the present invention;
fig. 16 is a schematic connection diagram of an interposer according to another embodiment of the present invention;
fig. 17 is an exploded view of a button cell according to an embodiment of the present invention;
fig. 18 is a perspective view of a button cell according to an embodiment of the invention.
Description of reference numerals:
101-a housing; 102-a housing cover; 1021-a first electrode section; 1022 — an insulating part; 1023-a second electrode portion; 103-liquid injection through holes; 1031-first liquid injection through hole; 1032-a second liquid injection through hole; 104-a recess; 200-an adaptor sheet; 201-a first transfer tab; 2011-first horizontal portion; 2012-inclined part; 2013-a second level portion; 202-a second interposer; 203-aluminum to nickel; 300-a laser beam; 400-electric core; 4001-positive electrode tab; 4002-negative pole tab.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first aspect of the present invention provides a battery case, where fig. 1 is a schematic structural diagram of a case provided in an embodiment of the present invention, fig. 2 is a schematic connection diagram of an interposer provided in an embodiment of the present invention, and fig. 3 is a schematic welding diagram of an interposer provided in an embodiment of the present invention, as shown in fig. 1 to 3, the battery case provided in the present invention includes a casing 101 and a casing cover 102, where the casing 101 and the casing cover 102 are connected to form an accommodating cavity for accommodating a battery cell; the shell 101 has certain conductivity, for example, it may be stainless steel, and the diameter and height of the shell 101 may be designed according to the size of the battery cell; the shell cover 102 is provided with an electrolyte injection through hole 103 for injecting electrolyte into the accommodating cavity from the outside; the adapter sheet 200 is welded on the case cover 102, one end of the adapter sheet 200 covers the liquid injection through hole 103 in the welding process, and then under the action of the laser beam 300, the laser beamThe adaptor sheet 200 and the case cover 102 are welded together in the edge area of the liquid injection through hole 103, so that the adaptor sheet 200 can replace a sealing nail to seal the liquid injection through hole 103, namely, the welding starting point and the welding terminal point of the adaptor sheet 200 and the case cover 102 coincide to form a closed welding area, and the liquid injection through hole 103 is located in the welding area and plays a role in sealing the liquid injection through hole 103. The welding track has various shapes, and the requirements of liquid injection through hole sealing and strength are met, specifically, the leak rate of the battery of the final finished product is less than 1.0E by using a helium test tightness test-6mbar.L/s。
The liquid injection through hole is directly sealed by the adapter sheet without using a sealing nail, so that the problems in the welding process of the adapter sheet and the sealing nail are solved, and the welding yield of the adapter sheet is improved; meanwhile, the weight of the battery is reduced, and the energy density of the battery is improved.
Fig. 4 is an exploded view of a housing cover according to an embodiment of the present invention, as shown in fig. 4, the housing cover 102 includes a first electrode portion 1021, an insulating portion 1022, and a second electrode portion 1023, the second electrode portion 1023 is connected to the housing 101, the insulating portion 1022 is located between the first electrode portion 1021 and the second electrode portion 1023 for isolating the first electrode portion 1021 and the second electrode portion 1023; in order to inject the electrolyte into the shell through the electrolyte injection through hole 103, through holes are formed in the first electrode part 1021, the insulating part 1022 and the second electrode part 1023, in order to prevent heat generated by welding the first electrode part 1021 and the interposer 200 from being transferred to the lower insulating part 1022 and causing the insulating glue in the insulating part 1022 to melt, the first electrode part 1021 is provided with a first electrolyte injection through hole 1031, the insulating part 1022 is provided with a second electrolyte injection through hole 1032, and the diameter of the first electrolyte injection through hole 1031 is smaller than that of the second electrolyte injection through hole 1032; the interposer 200 is connected with the first electrode part 1021 in a welding manner, and the interposer 200 covers the first liquid injection through hole 1031, that is, the width of the interposer 200 should be larger than the diameter of the first liquid injection through hole 1031 and smaller than the diameter of the second liquid injection through hole 1032, so that heat generated by welding the interposer 200 with the first electrode part 1021 cannot be transferred to the insulating part 1022 below, the problem that the insulating part 1022 is subjected to sol is avoided, and the sealing performance and the safety of the battery case are effectively improved.
When the housing 101 is made of stainless steel, the first electrode part 1021 has a positive polarity, may be made of aluminum/aluminum alloy, and the insulation part 1022 comprises a conventional insulation material, for example, one or more of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), Polyamide (PA), Polyimide (PI), aramid (meta-aramid PMIA, para-aramid PPTA); the second electrode portion 1023 has a negative polarity and may be made of nickel/stainless steel nickel plating.
With continued reference to fig. 2, the interposer 200 is used to connect the battery and the external circuit, and when one end of the interposer 200 covers the liquid injection through hole 103, the other end of the interposer 200 extends outward to be spaced apart from the case cover 102.
In order to improve the safety of the housing and prevent short-circuiting, an insulating layer is provided between one end of the interposer 200 and the housing cover 102.
In a specific embodiment, the interposer 200 includes a first interposer 201 and a second interposer 202 connected to each other, the first interposer 201 is connected to the housing cover 102 by welding, and the second interposer 202 is spaced from the housing cover 102, the first interposer 201 and the second interposer 202 have opposite electrical polarities, and the connection manner therebetween can be welding, electroplating or electroless plating, for example, fig. 5 is a schematic structural diagram of an interposer provided in an embodiment of the invention, fig. 6 is a schematic structural diagram of an interposer provided in another embodiment of the invention, fig. 7 is a schematic structural diagram of an interposer provided in another embodiment of the invention, fig. 8 is a schematic structural diagram of an interposer provided in another embodiment of the invention, as shown in fig. 5-8, when the first interposer 201 is an aluminum foil and the second interposer 202 is a nickel foil, the first interposer 201 and the second interposer 202 are connected together by an aluminum-to-nickel 203, that is, an aluminum-to-nickel converter 203 is disposed at one end of the first adapter sheet 201, and one end of the second adapter sheet 202 is connected to the aluminum-to-nickel converter 203 by means of welding or the like.
In order to prevent the second interposer 202 from contacting the first electrode portion 1021 to cause short circuit, an insulating layer is disposed between the second interposer 202 and the housing cover 102, the insulating layer may be made of insulating material such as insulating glue, and may be disposed on a side of the aluminum-nickel conversion layer 203 close to the housing.
The connection mode and shape of the first adapter sheet 201 and the second adapter sheet 202 are not further limited in the present invention, for example, the first adapter sheet 201 may be located above (as shown in fig. 6 and 8) or below (as shown in fig. 5 and 7) the second adapter sheet 202; the first and second transition pieces 201 and 202 may be rectangular or have a long-strip-shaped structure with an arc-shaped end, as shown in fig. 9-10, and may be specifically designed according to actual requirements of electronic products, as long as the requirement for covering the liquid injection through hole to seal the battery can be met.
The connection angle between the first adaptor sheet 201 and the second adaptor sheet 202 can be flexibly designed according to the electronic product, and the present invention is not limited further, for example, the structure shown in fig. 5 to 10 may be adopted, and the extension directions of the first adaptor sheet 201 and the second adaptor sheet 202 are perpendicular to or consistent with each other, that is, the included angle between the first adaptor sheet 301 and the second adaptor sheet 302 is 180 ° or 90 °.
For another example, fig. 11 is a schematic structural diagram of an interposer according to another embodiment of the present invention, and as shown in fig. 11, the second interposer 202 may be connected to the first interposer 201 by electroplating or chemical plating, for example, plating nickel on a surface of a portion of the first interposer 201 away from the first electrode portion 2021 to obtain the second interposer 202.
As in the previous embodiment, the second interposer 202 may be located on any surface of the first interposer 201, such as an upper surface or a lower surface, and the shape of the first interposer 201 and the second interposer 202 may be rectangular or an elongated structure with an arc-shaped end, as shown in fig. 12.
In view of the problem of short circuit of the battery, the area of the second interposer 202 is not too large, otherwise it is easy to contact with the first electrode portion 1021, specifically, the ratio of the lengths of the first interposer 201 and the second interposer 202 is greater than 2: 1, with continued reference to fig. 11, the length L of the first switching piece 2011: length L of the second interposer 2022≥2：1。
In order to prevent the second interposer 202 from contacting the first electrode portion 1021, an insulating layer may be provided at the interface between the first interposer 201 and the second interposer 202 to prevent short circuit.
In consideration of the practical use requirement of the battery, the present invention further limits the length of the first transfer tab 201, specifically, the length of the first transfer tab 201 is 4-10mm, if the length of the first transfer tab is too short, the second transfer tab 202 is easily contacted with the first electrode portion 203, which increases the short circuit risk of the battery, and if the length of the first transfer tab is too long, it is easy to cause inconvenience to the use of the battery and increase the manufacturing cost of the transfer tab.
Because the adaptor sheet 200 replaces the sealing nail to play a role in sealing the liquid injection through hole 103, the thickness of the adaptor sheet 200 is not too low, otherwise the strength of the position of the liquid injection through hole 103 cannot meet the use requirement, and the risk of liquid leakage and the like exists, but the excessively thick adaptor sheet is not favorable for the requirement of the energy density of the battery, and the thickness of the adaptor sheet 200 is 0.05-0.12mm by integrating various factors.
With continued reference to fig. 1, according to different design requirements of the battery case, the case cover 102 may further be provided with a recessed portion 104 recessed into the accommodating cavity, the liquid injection through hole 103 is disposed on the recessed portion 104, the recessed depth of the recessed portion 104 is 0.05-0.45mm, and the recessed portion 104 is used for installing other connecting components, which is beneficial to reducing the thickness of the battery and improving the volume energy density of the battery.
When the cover 102 is provided with the recessed portion 104, in order to seal the interposer 200 from the liquid injection through hole 103, the shape of the interposer 200 may be changed to fit the recessed portion 104, for example, the shape of the interposer may be changed to an inverted "Z" shape, that is, the interposer 200 includes a first horizontal portion, an inclined portion and a second horizontal portion connected end to end in sequence, the first horizontal portion is welded to the recessed portion 104, and the second horizontal portion is spaced from the recessed portion 104.
Taking the first transfer tab 201 as an example for explanation, fig. 13 is a schematic structural diagram of the first transfer tab provided in an embodiment of the present invention, and fig. 14 is a schematic connection diagram of the transfer tab provided in another embodiment of the present invention, as shown in fig. 13 to 14, the first transfer tab 201 includes a first horizontal portion 2011, an inclined portion 2012 and a second horizontal portion 2013 that are sequentially connected end to end, the first horizontal portion 2011 is connected to the recessed portion 104, the second horizontal portion 2013 is spaced from the recessed portion 104, and a terminal end of the inclined portion 2012 is higher than the recessed portion by 0.1 to 0.5mm, that is, a vertical distance between the first horizontal portion 2011 and the second horizontal portion 2013 is 0.1 to 0.5mm, it can be understood that an inclination angle of the inclined portion 2012 may be 90 ° or another angle shown in fig. 13, and when an inclination angle of the inclined portion 2012 is 90 °, a height of the inclined portion 2011 is 0.1 to 0.5 mm.
According to the different battery structures, the cover 102 may not have a recess, for example, fig. 15 is a schematic structural view of a battery case provided by another embodiment of the present invention, fig. 16 is a schematic connection view of an interposer provided by another embodiment of the present invention, as shown in fig. 15-16, the cover 102 does not include a recess, i.e., only includes the liquid injection through hole 103, and accordingly, the first interposer 201 is directly welded to the cover 102 and seals the liquid injection through hole 103 without changing the shape.
It can be understood that the width of the interposer 200 should be larger than the diameter of the liquid injection through hole 103 to ensure that the interposer 200 completely covers the liquid injection through hole 103 to achieve the sealing effect, but the diameter of the interposer 200 should not be too large, otherwise the interposer 200 is easily contacted with the second electrode portion 1023 to generate short circuit, specifically, the diameter of the liquid injection through hole 103 is 1-3mm, the width of the interposer 200 is 1.5-9mm, and the width of the interposer 200 is greater than or equal to the diameter of the liquid injection through hole 103.
The adapter sheet 200 is provided with a pressure relief groove, the pressure relief groove is positioned in the projection area of the liquid injection through hole 103 in the adapter sheet 200, namely the position of the pressure relief groove corresponds to the position of the liquid injection through hole 103, in the preparation process, the area of the adapter sheet 200 corresponding to the liquid injection through hole 103 can be thinned, the thickness of the thinned area is smaller than that of the surrounding area, when the internal pressure of the battery is too high, the pressure relief effect can be achieved, the safety of the battery is improved, the pressure relief groove can be arranged on any surface of the adapter sheet 200, the design and the preparation process of the pressure relief groove can be carried out according to the conventional technical means in the field, and the invention is not limited further.
In conclusion, the liquid injection through hole is directly sealed by the adapter sheet without using a sealing nail, so that the problems in the welding process of the adapter sheet and the sealing nail are solved, and the welding yield of the adapter sheet is improved; meanwhile, the weight of the battery is reduced, and the energy density of the battery is improved.
A battery according to a second aspect of the present invention, fig. 17 is an exploded view of a button battery according to an embodiment of the present invention, fig. 18 is a perspective view of a button battery according to an embodiment of the present invention, as shown in fig. 17-18, including a battery cell 400 and a battery case according to the first aspect of the present invention, the battery cell 400 is used as a part for performing an electrochemical reaction, and is disposed in a receiving cavity formed by the case, for providing a capacity for the button battery; the battery cell 400 comprises a positive pole piece, a diaphragm and a negative pole piece, wherein an electrochemical reaction is an oxidation-reduction reaction between the positive pole piece and the negative pole piece, the diaphragm is positioned between the positive pole piece and the negative pole piece and used for isolating the positive pole piece and the negative pole piece and preventing the short circuit of the battery cell, and the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked and assembled to prepare the battery cell 400 in the preparation process of the battery cell;
the battery cell 400 is connected with the housing through tabs, the tabs are used as metal conductors led out from the battery cell 400 and include a positive tab 4001 and a negative tab 4002, wherein the positive tab 4001 is located on the upper surface of the battery cell 400 close to the housing cover 102 and is connected with the first electrode part 1021, and the negative tab 4002 is located on the lower surface of the battery cell 400 far away from the housing cover 102 and is connected with the bottom wall of the housing 101.
The electrochemical reaction needs the electrolyte to transmit electrons or ions, so the battery also comprises the electrolyte, after the packaging of the battery is completed, the electrolyte is injected into the shell through the liquid injection through hole 103, and finally the liquid injection through hole 103 is covered and sealed by the adapter sheet 200.
The invention is described by taking a button cell as an example, and it can be understood that the battery shell and the characteristics of the battery described in the invention are also applicable to batteries with other shapes without conflict.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. The battery shell is characterized by comprising a shell body (101) and a shell cover (102), wherein the shell body (101) and the shell cover (102) are connected to form an accommodating cavity, and the shell cover (102) is provided with a liquid injection through hole (103) for injecting electrolyte into the accommodating cavity;
an adapter sheet (200) is welded on the shell cover (102), and one end of the adapter sheet (200) covers the liquid injection through hole (103).
2. The battery case according to claim 1, wherein the case cover (102) comprises a first electrode part (1021), an insulating part (1022) and a second electrode part (1023), the second electrode part (1023) being connected with the case body (101), the insulating part (1022) being located between the first electrode part (1021) and the second electrode part (1023) for isolating the first electrode part (1021) and the second electrode part (1023);
the first electrode part (1021) is provided with a first liquid injection through hole (1031), the insulating part (1022) is provided with a second liquid injection through hole (1032), and the diameter of the first liquid injection through hole (1031) is smaller than that of the second liquid injection through hole (1032);
the adapter sheet (200) is connected with the first electrode part (1021) in a welding mode, and the first liquid injection through hole (1031) is covered by the adapter sheet (200).
3. The battery housing according to claim 1 or 2, characterized in that the adapter plate (200) extends at one end to a position spaced apart from the housing cover (102).
4. The battery housing according to claim 3, characterized in that an insulating layer is arranged between one end of the interposer (200) and the housing cover (102).
5. The battery housing according to claim 3, characterized in that the adapter sheet (200) comprises a first adapter sheet (201) and a second adapter sheet (202) which are connected to each other, the first adapter sheet (201) is welded to the housing cover (102), and the second adapter sheet (202) is arranged at a distance from the housing cover (102).
6. The battery housing according to claim 5, characterized in that an insulating layer is arranged between the second interposer (202) and the housing cover (102).
7. The battery housing according to claim 1, wherein the thickness of the interposer (200) is 0.05-0.12 mm.
8. The battery case according to claim 1, wherein the case cover (102) is provided with a recessed portion (104) recessed toward the housing chamber, the liquid injection through hole (103) is provided in the recessed portion (104), and a recessed depth of the recessed portion (104) is 0.05-0.45 mm.
9. The battery shell according to claim 8, wherein the interposer (200) comprises a first horizontal portion (2011), an inclined portion (2012) and a second horizontal portion (2013) which are sequentially connected end to end, the first horizontal portion (2011) is welded with the recessed portion (104), the second horizontal portion (2013) is spaced from the recessed portion (104), and the tail end of the inclined portion (2012) is higher than the recessed portion (104) by 0.1-0.5 mm.
10. The battery shell according to claim 1, wherein the diameter of the liquid injection through hole (103) is 1-3mm, the width of the adaptor sheet (200) is 1.5-9mm, and the width of the adaptor sheet (200) is greater than or equal to the diameter of the liquid injection through hole (103).
11. The battery case according to claim 1, wherein the interposer (200) is provided with a pressure relief groove corresponding to the liquid injection through hole (103).
12. A battery comprising a cell and the battery casing of any one of claims 1-11, wherein the cell is disposed in the accommodating cavity and connected to the battery casing via a tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436229.6A CN113937436A (en) | 2021-11-29 | 2021-11-29 | Battery shell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436229.6A CN113937436A (en) | 2021-11-29 | 2021-11-29 | Battery shell and battery |
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| CN113937436A true CN113937436A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111436229.6A Pending CN113937436A (en) | 2021-11-29 | 2021-11-29 | Battery shell and battery |
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| CN113708017A (en) * | 2021-08-30 | 2021-11-26 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
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| US20210043912A1 (en) * | 2018-10-30 | 2021-02-11 | Contemporary Amperex Technology Co., Limited | Top pressing plate, secondary battery and method for manufacturing secondary battery |
| CN111416068A (en) * | 2020-04-27 | 2020-07-14 | 惠州亿纬锂能股份有限公司 | Electronic device and manufacturing method thereof |
| CN213401338U (en) * | 2020-10-23 | 2021-06-08 | 东莞塔菲尔新能源科技有限公司 | Power battery top cover structure and power battery |
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