CN113611961A - Battery case and battery - Google Patents
Battery case and battery Download PDFInfo
- Publication number
- CN113611961A CN113611961A CN202110899666.5A CN202110899666A CN113611961A CN 113611961 A CN113611961 A CN 113611961A CN 202110899666 A CN202110899666 A CN 202110899666A CN 113611961 A CN113611961 A CN 113611961A
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- Prior art keywords
- contact layer
- insulating
- battery
- layer
- welding
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- 238000007789 sealing Methods 0.000 claims abstract description 28
- 239000010410 layer Substances 0.000 claims description 242
- 238000003466 welding Methods 0.000 claims description 65
- 230000001070 adhesive effect Effects 0.000 claims description 60
- 239000000853 adhesive Substances 0.000 claims description 57
- 238000009413 insulation Methods 0.000 claims description 23
- 230000002708 enhancing effect Effects 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000679 solder Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 6
- 238000012858 packaging process Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- KHXKESCWFMPTFT-UHFFFAOYSA-N 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2-trifluoroethenoxy)propane Chemical compound FC(F)=C(F)OC(F)(F)C(F)(F)C(F)(F)F KHXKESCWFMPTFT-UHFFFAOYSA-N 0.000 description 1
- 239000010963 304 stainless steel Substances 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Images
Classifications
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- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/153—Lids or covers characterised by their shape 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/164—Lids or covers characterised by the material having a layered structure
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a battery shell and a battery, wherein the battery shell is divided into a bottom shell and a sealing cover, the sealing cover is divided into an outer contact layer, an insulating layer and an inner contact layer, wherein an inner electrode connecting part of the inner contact layer can be electrically conducted with one electrode of a battery cell, an outer electrode connecting part of the outer contact layer can be conducted with the other electrode of the battery cell, the battery cell can be packaged after the outer contact layer is welded with the bottom shell, and the bottom shell can be insulated with the inner contact layer due to the fact that the inner contact layer is insulated with the outer contact layer through the insulating layer, and therefore the mutual conduction short circuit of two electrodes of the battery cell can be prevented; because the inner contact layer and the outer contact layer of the sealing cover are insulated in advance, when the sealing cover is used for packaging the bottom shell, only the outer contact layer and the bottom shell need to be welded, an insulating film does not need to be arranged, and therefore the packaging process of the battery can be simplified, and the packaging efficiency is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery shell and a battery.
Background
The battery shell of the conventional button battery is formed by splicing an anode shell and a cathode shell, and the anode shell and the cathode shell need to be insulated so as to avoid short circuit of the button battery; in the related art, insulation is realized by arranging an insulating film between the anode shell and the cathode shell, the anode shell and the cathode shell are welded and fixed, the insulating film is difficult to set in a processing process, the button cell is difficult to process, and the processing efficiency is reduced.
Disclosure of Invention
The invention mainly aims to provide a battery case for a button battery, and aims to solve the technical problem of how to improve the processing efficiency of the battery.
In order to achieve the above object, the present invention provides a battery case including a cup-shaped bottom case and a lid for sealing an opening of the bottom case;
the bottom shell comprises a circular or oval bottom wall and an annular side wall;
the sealing cover sequentially comprises an outer contact layer, an insulating layer and an inner contact layer from outside to inside;
the maximum outer diameter D1 of the outer contact layer is larger than the maximum outer diameter D2 of the inner contact layer, and the outer circle center of the outer contact layer and the inner circle center of the inner contact layer are not overlapped;
the inner contact layer comprises an outer electric connection part, an inner electrode connection part and a conductive bonding part;
the insulating layer comprises an insulating bonding part and an insulating opening part;
the external contact layer comprises a welding part, a welding bonding part, a welding hole part and an external electrode connecting part;
a welding supporting part is arranged on the side wall close to the opening;
the inner electrode connecting part is positioned on the surface, facing the inside of the battery shell, of the inner contact layer and is used for being electrically connected with one of the battery cells so as to enable the inner contact layer to be electrically communicated with the battery cells;
the outer electrode connecting part is positioned on the surface of the outer contact layer facing the inside of the battery shell and is used for being electrically connected with the other electrode of the battery cell so as to enable the outer contact layer to be electrically communicated with the battery cell;
the surface area S1 of the outer electrode connection part and the surface area S2 of the inner contact layer satisfy S1 ═ 0.25S 5;
the external electric connecting part is used for electrically connecting external electric equipment;
the conductive bonding part is used for being seamlessly bonded with the insulating bonding part so as to strengthen the strength of the sealing cover, reduce the direct contact area of the insulating bonding part and the inside of the battery case and prevent external water from permeating into the inside of the battery case;
the welding part is used for being connected with the welding supporting part in a welding mode so that the sealing cover and the bottom shell are sealed;
the welding bonding part is used for enhancing the strength of the sealing cover and preventing external water from permeating into the battery shell;
before the sealing cover is sealed with the bottom case, the insulating bonding part is seamlessly bonded with the conductive bonding part and the welding bonding part after an insulating electrolyte corrosion-resistant material with the thermal shrinkage rate of less than 6% at 100 ℃ is melted, the bonding strength between the insulating bonding part and the conductive bonding part and between the insulating bonding part and the welding bonding part at a cooling normal temperature is greater than or equal to 1.0N per square millimeter, the thickness D3 of the insulating bonding part is 0.01mm-2.5mm, and the contact area S0 between the insulating bonding part and the inside of the battery case meets the condition that S0> pi D2D 3 1/2.
Optionally, the material of the outer contact layer is stainless steel, and the thickness d4 of the outer contact layer is 0.15mm-0.25 mm; and/or the material of the inner contact layer is stainless steel, and the thickness d5 of the inner contact layer is 0.05mm-0.25 mm.
Optionally, the thickness d4 of the outer contact layer is equal to or greater than the thickness d5 of the inner contact layer.
Optionally, the bonding strength between the insulating bonding part and the conductive bonding part and between the insulating bonding part and the welding bonding part at a cooling normal temperature is less than or equal to 5.0N per square millimeter.
Optionally, an area S3 of the insulating bonding part and an area S4 of the insulating layer satisfy S3/S4> -0.6; and/or the area S3 of the insulating bonding part and the area S5 of the outer contact layer meet the condition that S3/S5> is 0.5.
Optionally, a first adhesion enhancement layer is arranged on the first surface layer of the conductive adhesion part, which is close to the insulating adhesion part, and is used for enhancing the adhesion strength between the conductive adhesion part and the insulating adhesion part; and/or a second bonding enhancement layer is arranged on a second surface layer of the welding bonding part, which is close to the insulating bonding part, and is used for enhancing the bonding strength between the welding bonding part and the insulating bonding part.
Alternatively, the external electrical connection part is located at one side of the insulation opening part and the welding opening part near the inside of the battery case.
Optionally, the outer electrical connection portion protrudes out of the plane of the conductive adhesive portion, protrudes towards the outside of the battery case, and sequentially passes through the insulation opening portion and the welding opening portion, and the diameter D6 of the outer electrical connection portion is less than or equal to half of the maximum outer diameter D2 of the inner contact layer.
Optionally, the battery case further includes a protective member fixedly formed by filling a liquid glue in a gap between the outer electrical connection part, the insulation opening part, and the welding opening part at a normal temperature after the sealing of the cover and the bottom case.
The invention also provides a battery, which comprises a battery core and the battery shell, wherein one pole of the battery core is electrically connected with the inner electrode connecting part of the battery shell, and the other pole of the battery core is electrically connected with the outer electrode connecting part of the battery shell.
The battery case is divided into the bottom case and the sealing cover, and the sealing cover is divided into the outer contact layer, the insulating layer and the inner contact layer, wherein the inner electrode connecting part of the inner contact layer can be electrically conducted with one electrode of the battery cell, the outer electrode connecting part of the outer contact layer can be conducted with the other electrode of the battery cell, the battery cell can be packaged after the outer contact layer is welded with the bottom case, and the bottom case can be insulated with the inner contact layer due to the fact that the inner contact layer is insulated with the outer contact layer through the insulating layer, and therefore mutual conduction short circuit of two electrodes of the battery cell can be prevented; because the inner contact layer and the outer contact layer of the sealing cover are insulated in advance, when the sealing cover is used for packaging the bottom shell, only the outer contact layer and the bottom shell need to be welded, an insulating film does not need to be arranged, and therefore the packaging process of the battery can be simplified, and the packaging efficiency is improved; further, by defining the contact area S0 of the insulating adhesive part with the inside of the battery case as S0> ═ pi × D2 × D3 × 1/2, the adhesive area of the insulating adhesive part with the inner and outer contact layers can be increased, thereby improving the adhesion stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is an exploded view of the structure of one embodiment of a battery case according to the present invention;
fig. 2 is a cross-sectional exploded view of one embodiment of a battery case according to the present invention;
FIG. 3 is a schematic cross-sectional view illustrating one embodiment of a battery case according to the present invention;
FIG. 4 is a cross-sectional view of an embodiment of the closure of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | Sealing cover | 11 | |
| 12 | |
21 | |
22 | Insulating |
| 23 | |
231 | External |
232 | Inner |
| 233 | Conductive |
221 | Insulating |
222 | Insulation opening |
| 211 | Weld |
212 | |
213 | Welding the |
| 214 | External |
121 | |
234 | First |
| 215 | Second |
30 | |
40 | Insulation gap |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a battery case for a button battery.
In the embodiment of the present invention, as shown in fig. 1 to 4, the battery case includes a cup-shaped bottom case 10 and a cover 20 for sealing an opening of the bottom case 10;
the bottom shell 10 comprises a circular or oval bottom wall 11 and an annular side wall 12;
the sealing cover 20 sequentially comprises an outer contact layer 21, an insulating layer 22 and an inner contact layer 23 from outside to inside;
the maximum outer diameter D1 of the outer contact layer 21 is larger than the maximum outer diameter D2 of the inner contact layer 23, and the outer circle center of the outer contact layer 21 and the inner circle center of the inner contact layer 23 do not overlap with each other;
the inner contact layer 23 includes an outer electrical connection portion 231, an inner electrode connection portion 232, and a conductive adhesive portion 233;
the insulating layer 22 includes an insulating adhesive portion 221 and an insulating opening portion 222;
the outer contact layer 21 includes a welding portion 211, a welding adhesion portion 212, a welding opening portion 213, and an outer electrode connecting portion 214;
a welding support part 121 is arranged on the side wall 12 close to the opening;
the inner electrode connecting part 232 is located on the surface of the inner contact layer 23 facing the inside of the battery case, and is used for electrically connecting with one of the battery cells 30, so that the inner contact layer 23 is electrically communicated with the battery cell 30;
the external electrode connecting part 214 is located on the surface of the external contact layer 21 facing the inside of the battery case, and is used for electrically connecting with another electrode of the battery cell 30, so that the external contact layer 21 is electrically communicated with the battery cell 30;
the surface area S1 of the outer electrode connecting part 214 and the surface area S2 of the inner contact layer 23 satisfy S1 ≦ 0.25S 5;
the external electrical connection part 231 is used to electrically connect an external electrical device;
the conductive adhesive part 233 is used for seamless adhesion with the insulating adhesive part 221, so as to reinforce the strength of the cover 20, reduce the direct contact area of the insulating adhesive part 221 with the inside of the battery case, and prevent external water from penetrating into the inside of the battery case;
the welding part 211 is used for welding and connecting with the welding support part 121 so as to seal the cover 20 and the bottom case 10;
the weld-bonding part 212 serves to reinforce the strength of the cap 20 and prevent external water from penetrating into the battery case;
before the sealing cover 20 is sealed with the bottom case 10, the insulating adhesive part 221 is melted by an insulating electrolyte corrosion-resistant material having a heat shrinkage rate of 6% or less at 100 ℃ or higher, then is seamlessly adhered to the conductive adhesive part 233 and the welding adhesive part 212, and has an adhesion strength of 1.0N per square millimeter or higher between the conductive adhesive part 233 and the welding adhesive part 212 at a cooling normal temperature, a thickness D3 of the insulating adhesive part 221 is 0.01mm to 2.5mm, and a contact area S0 between the insulating adhesive part 221 and the inside of the battery case satisfies S0> -pi D2-D3-1/2.
The bottom shell 10 may be made of a stainless steel plate, and an opening of the bottom shell 10 faces upward to accommodate the battery cell 30 and the electrolyte; the bottom wall 11 and the side wall 12 may be integrally formed by injection molding, or may be fixed by welding, which is not limited herein. The outer contact layer 21 and the inner contact layer 23 of the cap 20 may be made of stainless steel plate. The inner electrode connecting portion 232 of the inner contact layer 23 faces into the battery case to be connected with one of the electrodes of the battery cell 30; the outer electrical connection portion 231 of the inner contact layer 23 faces the outside of the battery case through the insulation opening portion 222 and the welding opening portion 213 to be electrically connected to an external device. The external electrical connection portion 231 may be located at one side of the insulation opening portion 222 and the welding opening portion 213 close to the inside of the battery case, or may protrude toward the outside of the battery case, and sequentially pass through the insulation opening portion 222 and the welding opening portion 213, which is not limited herein, and only needs to satisfy that the external electrical connection portion 231 is exposed to the cover 20.
Since the maximum outer diameter D1 of the outer contact layer 21 is larger than the maximum outer diameter D2 of the inner contact layer 23, the welding portion 211 protrudes from the circumferential wall of the inner contact layer 23 in the radial direction, so that a space is formed between the circumferential wall of the inner contact layer 23 and the welding support portion 121, and the outer contact layer 21 is prevented from contacting the sidewall 12. The outer circle center of the outer contact layer 21 and the inner circle center of the inner contact layer 23 do not overlap with each other, the outer contact layer 21 is connected to the sidewall 12 of the bottom case 10, that is, the circle center of the outer contact layer 21 is coaxial with the circle center of the bottom wall 11, that is, the circle center of the inner contact layer 23 is offset from the central axis of the battery case, so that the outer contact layer 21 protrudes from the peripheral wall of the inner contact layer 23 by a region with a larger area, and the outer electrode connecting portion 214 is formed on the inner surface of the region. The outer electrode connecting portion 214 is used for electrically connecting another electrode of the battery cell 30, for example, the positive electrode of the battery cell 30 is connected to the inner electrode connecting portion 232 of the inner contact layer 23, and the negative electrode of the battery cell 30 can be connected to the outer electrode connecting portion 214, so that both the positive electrode and the negative electrode of the battery cell 30 can be connected to the cover 20, and therefore, a space is not required to be reserved between the battery cell 30 and the bottom case 10 for electrode extension, thereby reducing the volume of the bottom case 10 and reducing the overall volume of the battery.
Since the insulating layer 22 is disposed between the outer contact layer 21 and the inner contact layer 23, the outer contact layer 21 and the inner contact layer 23 are insulated from each other, so that the bottom case 10 and the cover 20 can be insulated from each other to prevent the two electrodes of the battery cell 30 from being conducted with each other, and thus, the cover 20 and the bottom case 10 can form two output electrodes of the battery respectively, and the two output electrodes can be prevented from being conducted with each other to cause a short circuit. Of course, the outer surface of the outer contact layer 21 and the outer electrical connection portion 231 of the inner contact layer 23 may form two output electrodes of the battery, respectively, without limitation. The surface area S1 of the external electrode connecting part 214 and the surface area S2 of the inner contact layer 23 are set to S1 ≦ 0.25S5, so that the surface area of the external electrode connecting part 214 can be reasonably controlled, the bonding area of the solder bonding part 212 and the conductive bonding part 233 can be increased, the bonding strength between the external contact layer 21 and the inner contact layer 23 can be improved, and the structural stability of the cap 20 can be ensured.
The welding portion 211, that is, the outer contact layer 21 is used at a position where it is welded to the welding support portion 121, and the welding portion 211 is provided in the peripheral wall of the outer contact layer 21. After the welding portion 211 is welded to the side wall 12, the cover 20 and the bottom case 10 can be fixed to each other, and the external contact layer 21 and the bottom case 10 can be electrically conducted. The electrode of the battery cell 30 may be directly in contact with the inner electrode connection part 232. The top and bottom surfaces of the insulating adhesive portion 221 are adhered to the conductive adhesive portion 233 and the solder adhesive portion 212, respectively, to achieve the insulating connection of the outer contact layer 21 and the inner contact layer 23. The outer contact layer 21 is welded and sealed with the side wall 12, and the inner contact layer 23 is seamlessly bonded with the outer contact layer 21 through the insulating layer 22, so that the sealing cover 20 can seal the bottom case 10. Here, when the outer contact layer 21 and the side wall 12 are soldered, the outer contact layer 21 and the inner contact layer 23 are already connected in an insulating manner, and therefore, it is not necessary to provide an insulating film separately.
The insulating layer 22 is made of a material having insulating properties and being resistant to electrolyte corrosion, and has a heat shrinkage rate of 6% or less at 100 ℃, wherein the heat shrinkage rate refers to a volume change of a thermoplastic material due to its inherent thermal expansion rate, that is, at a temperature of 100 ℃ or more, a volume change amount of the insulating layer 22 is not more than 6% of an original volume, so that the insulating layer 22 can be sufficiently melted and then sufficiently connected with the inner contact layer 23 and the outer contact layer 21 to ensure an adhesive effect. The bonding strength between the insulating layer 22 and the conductive bonding part 233 and between the insulating layer 22 and the welding bonding part 212 is greater than or equal to 1.0N per square millimeter at the cooling normal temperature, so that the bonding stability between the insulating layer 22 and the inner contact layer 23 and between the insulating layer 22 and the outer contact layer 21 can be ensured; specifically, the bonding strength between the insulating bonding portion 221 and the conductive bonding portion 233 and between the insulating bonding portion 221 and the solder bonding portion 212 is not more than 5.0N/mm at a cooling normal temperature, so as to prevent an internal stress of the cap 20 from being too high, and thus, the cap 20 can be prevented from being damaged by an internal force during subsequent processing or use. The thickness d3 of the insulating adhesive portion 221 is set to 0.01mm-2.5mm, so that the insulating adhesive portion 221 can stably withstand changes in temperature or external force, the adhesion stability of the insulating adhesive portion 221 can be improved, and the overall thickness dimension of the cap 20 can be reasonably controlled.
The contact area S0 between the insulating bonding part 221 and the inside of the battery case satisfies S0> -pi x D2 x D3 x 1/2; the contact area between insulating adhesive portion 221 and the inside of the battery case is the area of insulating adhesive portion 221 exposed to the electrolyte, that is, the area of the outer peripheral wall of insulating layer 22. The area S0 of the outer peripheral wall of the insulating layer 22, pi D3, the maximum outer diameter of the insulating layer 22, that is, the maximum outer diameter of the insulating layer 22 should be equal to or greater than D2, 1/2, so that the connecting area between the insulating adhesive part 221 and the conductive adhesive part 233 can be effectively increased while the thickness of the insulating layer 22, that is, the contact area between the insulating adhesive part 221 and the inside of the battery case, is reasonably controlled, thereby reducing the corrosion area of the insulating layer 22 by the electrolyte and improving the adhesion stability between the insulating layer 22 and the inner contact layer 23.
The battery case is divided into the bottom case 10 and the cover 20, and the cover 20 is divided into the outer contact layer 21, the insulating layer 22 and the inner contact layer 23, wherein the inner electrode connecting part 232 of the inner contact layer 23 is electrically conducted with one electrode of the battery cell 30, the outer electrode connecting part 214 of the outer contact layer 21 is electrically conducted with the other electrode of the battery cell 30, the battery cell 30 can be encapsulated after the outer contact layer 21 is welded with the bottom case 10, and the bottom case 10 is also insulated from the inner contact layer 23 because the inner contact layer 23 and the outer contact layer 21 are insulated by the insulating layer 22, so that the two electrodes of the battery cell 30 can be prevented from being mutually conducted and shorted; since the inner contact layer 23 and the outer contact layer 21 of the cover 20 are insulated in advance, when the cover 20 is used for packaging the bottom case 10, only the outer contact layer 21 and the bottom case 10 need to be welded without arranging an insulating film, so that the packaging process of the battery can be simplified, and the packaging efficiency can be improved; further, by defining the contact area S0 of the insulating adhesive part 221 with the inside of the battery case as S0> ═ pi × D2 × D3 × 1/2, the adhesive area of the insulating adhesive part 221 with the inner contact layer 23 and the outer contact layer 21 can be increased, thereby improving the adhesion stability.
Specifically, the material of the outer contact layer 21 is stainless steel, and the thickness d4 of the outer contact layer 21 is 0.15mm-0.25 mm; and/or the material of the inner contact layer 23 is stainless steel, and the thickness d5 of the inner contact layer 23 is 0.05mm-0.25 mm. The stainless steel can be 304 stainless steel, contains higher nickel, is in an austenite single-phase structure at room temperature, has higher corrosion resistance, better cold forming and weldability, and has higher plasticity and toughness at low temperature, room temperature and high temperature. The provision of the external contact layer 21 and the internal contact layer 23 as SUS304 ensures structural stability of the cap 20 during processing and chemical stability when used as a battery case.
The thickness d4 of the outer contact layer 21 is set to 0.15mm-0.25mm, which can make the outer contact layer 21 have enough structural strength and reasonably control the overall thickness dimension of the cover 20. The thickness d5 of inner contact layer 23 is set to 0.05mm to 0.25mm to provide both sufficient structural strength to inner contact layer 23 and reasonable control over the overall thickness dimension of closure 20. In practical applications, the thickness d4 of the outer contact layer 21 is greater than or equal to the thickness d5 of the inner contact layer 23, so that the outer contact layer 21 has enough circumferential wall area to increase the welding area with the welding support part 121, thereby improving the welding strength and the stress resistance of the outer contact layer 21 when the battery case is pressed; the thickness d5 of the inner contact layer 23 is smaller than or equal to the thickness d4 of the outer contact layer 21, so that the load of the inner contact layer 23 on the outer contact layer 21 can be reduced, and the outer contact layer 21 can be prevented from being deformed and damaged by excessive internal force and external force synchronously.
The insulating layer 22 is made of one or more of PP (polypropylene), PFA (a small amount of copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), and PVC (polyvinyl chloride).
In one embodiment, the area S3 of the insulating adhesive portion 221 and the area S4 of the insulating layer 22 satisfy S3/S4> -0.6; and/or the area S3 of the insulating adhesive part 221 and the area S5 of the outer contact layer 21 satisfy S3/S5> being 0.5, thereby effectively ensuring the adhesive area between the insulating layer 22 and the inner contact layer 23 and improving the connection stability between the insulating layer 22 and the outer contact layer 21; meanwhile, the size of the insulation opening part 222 can be reasonably controlled, so that the area of the outer electric connection part 231 is effectively controlled, and the area utilization rate of the inner contact layer 23 is improved.
In one embodiment, as shown in fig. 4, the conductive adhesive part 233 is provided with a first adhesive enhancement layer 234 adjacent to the first surface layer of the insulating adhesive part 221 for enhancing the adhesive strength with the insulating adhesive part 221; and/or a second adhesion enhancement layer 215 is arranged on a second surface layer of the welding adhesion part 212 close to the insulating adhesion part 221, and is used for enhancing the adhesion strength between the welding adhesion part and the insulating adhesion part 221. The specific form of the first adhesion enhancing layer 234 is not limited, and it is sufficient to increase the connection area with the insulating adhesion portion 221 to enhance the adhesion strength. For example, the first adhesion enhancing layer 234 may be provided as a protrusion. The second adhesion enhancing layer 215 can refer to the first adhesion enhancing layer 234, and it should be noted that the first adhesion enhancing layer 234 and the second adhesion enhancing layer 215 can indirectly cooperate with each other through the insulating layer 22 to further improve the combination stability of the outer contact layer 21, the insulating layer 22 and the inner contact layer 23.
Specifically, as shown in fig. 4, the first adhesion enhancing layer 234 is a first surface layer of the first stainless steel layer close to the insulating adhesion part 221, which is processed by sand blasting to form a uniform first rough surface layer; and/or the second bonding enhancement layer 215 is a second surface layer of the second stainless steel layer close to the insulating bonding part 221, and is processed by sand blasting to form a uniform second rough surface layer. It is understood that uniform in this embodiment does not mean absolutely uniform, but rather a natural uniform matte surface formed by grit blasting the first surface layer. The first rough surface layer enables the adhesion force between each part of the first surface layer and the insulating bonding part 221 to be more uniform, so that stress concentration is avoided. Similarly, the second rough surface layer can make the adhesion between each part of the second surface layer and the insulating adhesive part 221 more uniform. By forming the first and second adhesion enhancing layers 234 and 215 by sand blasting, the processing of the first and second adhesion enhancing layers 234 and 215 can be simplified to improve the processing efficiency.
In another embodiment, the first adhesion enhancing layer 234 is a first inclined plate protruding from the first skin layer and having a certain inclination angle with the first skin layer, the first inclined plate has a height smaller than the thickness of the insulating adhesive portion 221, the second adhesion enhancing layer 215 is a second inclined plate protruding from the second skin layer and having a certain inclination angle with the second skin layer, the second inclined plate has a height smaller than the thickness of the insulating adhesive portion 221, and the first inclined plate and the second inclined plate are alternately arranged with each other in opposite inclination directions. The number of the first inclined pieces is multiple and distributed on the first surface layer, and the melted adhesive insulating layer 22 can fill the space between two adjacent first inclined pieces so as to be adhered and connected with the side surface of each first inclined piece. The height of the first inclined sheet is the vertical distance between the tail end of the first inclined sheet and the first surface layer, and the height of the first inclined sheet is smaller than the thickness of the insulating bonding part 221, so that the first inclined sheet can be prevented from contacting the second stainless steel layer after penetrating through the insulating bonding part 221. The distribution and action of the second inclined plate can be referred to the first inclined plate. The first inclined pieces and the second inclined pieces are alternately arranged in the longitudinal direction, so that the first inclined pieces and the second inclined pieces can be adjacent to each other after the insulating adhesive part 221 is inserted, and the outer contact layer 21 and the inner contact layer 23 can be closer to each other without reducing the thickness of the insulating adhesive part 221, thereby improving the structural strength of the cap 20.
In yet another embodiment, the first adhesion enhancing layer 234 is a first groove recessed into the first surface layer, the recessed direction of the first groove is away from the insulating adhesive layer direction; and/or the second adhesion enhancement layer 215 is a second groove recessed into the second surface layer, the recessed direction of the second groove being away from the insulating adhesion layer. The quantity of first recess is a plurality of, and a plurality of first recesses distribute in first top layer, and the insulating bonding portion 221 that melts can fill in first recess to increase the area of connection with first top layer, thereby strengthen the adhesive strength of outer contact layer 21 and insulating bonding portion 221. The arrangement and function of the second groove can refer to the first groove, and are not described herein again.
In an embodiment, the external electrical connection part 231 is located at one side of the insulation hole part 222 and the welding hole part 213 close to the inside of the battery case, so that the distance between the internal electrode connection part 232 and the battery cell 30 can be reduced, and the electrode of the battery cell 30 can be more easily connected with the internal electrode connection part 232, thereby simplifying the processing manner of the battery.
In another embodiment, as shown in fig. 3, the outer electrical connection portion 231 protrudes out of the plane of the conductive adhesive portion 233 and protrudes toward the outside of the battery case, and sequentially passes through the insulation opening portion 222 and the welding opening portion 213, and the diameter D6 of the outer electrical connection portion 231 is less than or equal to half of the maximum outer diameter D2 of the inner contact layer 23. The external electrical connection part 231 protrudes toward the outside of the battery case, which facilitates the electrical connection of an external device with the external electrical connection part 231, thereby improving the convenience of use of the battery. The diameter D6 of the outer electrical connection portion 231 is less than or equal to half of the maximum outer diameter D2 of the inner contact layer 23, so that the conductive adhesive portion 233 has enough area to be adhered to the insulating layer 22, thereby ensuring adhesion stability. It should be noted that the distance between the protruded outer electrical connection portion 231 and the welding hole portion 213 of the outer contact layer 21 should be sufficient to prevent the outer electrical connection portion 231 from contacting the welding adhesion portion 212 when the battery case is pressed.
Specifically, the battery case further includes a protective member (not shown) fixedly formed by liquid glue filled in a gap between the outer electrical connection part 231, the insulation opening part 222, and the welding opening part 213 at a normal temperature after the sealing of the cover 20 with the bottom case 10. An insulation gap 40 is formed between the outer electrical connection portion 231, the insulation opening portion 222 and the welding opening portion 213, the insulation gap 40 extends along the circumferential direction of the outer electrical connection portion 231, and the protector is annularly mounted to the insulation gap 40. The protection member can cover the portion of the insulation bonding portion 221 exposed to the insulation gap 40, and can effectively isolate the outer electrical connection portion 231 from the solder bonding portion 212, thereby preventing the outer contact layer 21 and the inner contact layer 23 from being electrically connected. It can be understood that the protection member is configured to be formed by curing the liquid gel, so that the insulation of the outer contact layer 21 from the inner contact layer 23 can be achieved, and the force pressure of the protection member against the outer contact layer 21 and the outer electrical connection portion 231 can be reduced to prevent the outer contact layer 21 and the outer electrical connection portion 231 from being deformed, thereby ensuring the structural stability of the battery case.
In one embodiment, the insulating layer 22 may include a first adhesive layer, a conduction preventing layer and a second adhesive layer stacked, wherein the first adhesive layer adheres the outer contact layer 21 and the conduction preventing layer, the second adhesive layer adheres the inner contact layer 23 and the conduction preventing layer, and the conduction preventing layer may ensure that the outer contact layer 21 and the inner contact layer 23 are insulated from each other. So, first adhesive linkage and second adhesive linkage only need have adhesive property can, the anti-conduction layer only need have insulating properties can, realize two kinds of performances of insulating layer 22 through different function levels, can make the adhesive property and the insulating properties of corresponding level strengthen more to improve insulating layer 22's wholeness ability.
The present invention further provides a battery, which includes a battery core 30 and a battery case, and the specific structure of the battery case refers to the above embodiments, and since the battery employs all technical solutions of all the above embodiments, the battery at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. One of the poles of the battery cell 30 is electrically connected to the inner electrode connecting portion 232 of the battery case, and the other pole is electrically connected to the outer electrode connecting portion 214 of the battery case.
The battery can be set as a button battery which is mainly applied to electronic products to provide electric energy for the electronic products. The electronic product can be an earphone, a watch and the like, and is low in voltage.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A battery shell for button batteries is characterized in that,
the battery case comprises a cup-shaped bottom case and a cover for sealing an opening of the bottom case;
the bottom shell comprises a circular or oval bottom wall and an annular side wall;
the sealing cover sequentially comprises an outer contact layer, an insulating layer and an inner contact layer from outside to inside;
the maximum outer diameter D1 of the outer contact layer is larger than the maximum outer diameter D2 of the inner contact layer, and the outer circle center of the outer contact layer and the inner circle center of the inner contact layer are not overlapped;
the inner contact layer comprises an outer electric connection part, an inner electrode connection part and a conductive bonding part;
the insulating layer comprises an insulating bonding part and an insulating opening part;
the external contact layer comprises a welding part, a welding bonding part, a welding hole part and an external electrode connecting part;
a welding supporting part is arranged on the side wall close to the opening;
the inner electrode connecting part is positioned on the surface, facing the inside of the battery shell, of the inner contact layer and is used for being electrically connected with one of the battery cells so as to enable the inner contact layer to be electrically communicated with the battery cells;
the outer electrode connecting part is positioned on the surface of the outer contact layer facing the inside of the battery shell and is used for being electrically connected with the other electrode of the battery cell so as to enable the outer contact layer to be electrically communicated with the battery cell;
the surface area S1 of the outer electrode connection part and the surface area S2 of the inner contact layer satisfy S1 ═ 0.25S 5;
the external electric connecting part is used for electrically connecting external electric equipment;
the conductive bonding part is used for being seamlessly bonded with the insulating bonding part so as to strengthen the strength of the sealing cover, reduce the direct contact area of the insulating bonding part and the inside of the battery case and prevent external water from permeating into the inside of the battery case;
the welding part is used for being connected with the welding supporting part in a welding mode so that the sealing cover and the bottom shell are sealed;
the welding bonding part is used for enhancing the strength of the sealing cover and preventing external water from permeating into the battery shell;
before the sealing cover is sealed with the bottom case, the insulating bonding part is seamlessly bonded with the conductive bonding part and the welding bonding part after an insulating electrolyte corrosion-resistant material with the thermal shrinkage rate of less than 6% at 100 ℃ is melted, the bonding strength between the insulating bonding part and the conductive bonding part and between the insulating bonding part and the welding bonding part at a cooling normal temperature is greater than or equal to 1.0N per square millimeter, the thickness D3 of the insulating bonding part is 0.01mm-2.5mm, and the contact area S0 between the insulating bonding part and the inside of the battery case meets the condition that S0> pi D2D 3 1/2.
2. The battery case according to claim 1, wherein the material of the outer contact layer is stainless steel, and the thickness d4 of the outer contact layer is 0.15mm to 0.25 mm; and/or the material of the inner contact layer is stainless steel, and the thickness d5 of the inner contact layer is 0.05mm-0.25 mm.
3. The battery case of claim 1, wherein the thickness d4 of the outer contact layer is equal to or greater than the thickness d5 of the inner contact layer.
4. The battery can of claim 1, wherein the bond strength between the insulative bond and the conductive and solder bonds is 5.0N per square millimeter or less at cold ambient temperatures.
5. The battery case of claim 1, wherein an area S3 of the insulating adhesive part and an area S4 of the insulating layer satisfy S3/S4> -0.6; and/or the area S3 of the insulating bonding part and the area S5 of the outer contact layer meet the condition that S3/S5> is 0.5.
6. The battery case according to any one of claims 1 to 5, wherein the conductive adhesive part is provided with a first adhesion enhancing layer adjacent to the first surface layer of the insulative adhesive part for enhancing the adhesive strength with the insulative adhesive part; and/or a second bonding enhancement layer is arranged on a second surface layer of the welding bonding part, which is close to the insulating bonding part, and is used for enhancing the bonding strength between the welding bonding part and the insulating bonding part.
7. The battery case according to any one of claims 1 to 5, wherein the external electrical connection part is located at a side of the insulation opening part and the welding opening part adjacent to the inside of the battery case.
8. The battery case of any one of claims 1 to 5, wherein the outer electrical connection part protrudes out of the plane of the conductive adhesive part and in a direction toward the outside of the battery case, and sequentially passes through the insulation opening part and the welding opening part, and the diameter D6 of the outer electrical connection part is equal to or less than half of the maximum outer diameter D2 of the inner contact layer.
9. The battery case of claim 8, further comprising a protective member formed by fixing liquid gel filled in gaps between the outer electrical connection part, the insulation opening part, and the welding opening part at normal temperature after the sealing of the cover and the bottom case.
10. A battery comprising a cell and the battery case according to any one of claims 1 to 9, wherein one of the poles of the cell is electrically connected to an inner electrode connecting part of the battery case, and the other pole is electrically connected to an outer electrode connecting part of the battery case.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110899666.5A CN113611961A (en) | 2021-08-06 | 2021-08-06 | Battery case and battery |
| CN202211335163.6A CN115911686A (en) | 2021-08-06 | 2021-08-06 | Electrochemical storage metal housing and battery |
| PCT/CN2021/141446 WO2023010781A1 (en) | 2021-08-06 | 2021-12-27 | Battery casing and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110899666.5A CN113611961A (en) | 2021-08-06 | 2021-08-06 | Battery case and battery |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211335163.6A Division CN115911686A (en) | 2021-08-06 | 2021-08-06 | Electrochemical storage metal housing and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113611961A true CN113611961A (en) | 2021-11-05 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211335163.6A Pending CN115911686A (en) | 2021-08-06 | 2021-08-06 | Electrochemical storage metal housing and battery |
| CN202110899666.5A Withdrawn CN113611961A (en) | 2021-08-06 | 2021-08-06 | Battery case and battery |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211335163.6A Pending CN115911686A (en) | 2021-08-06 | 2021-08-06 | Electrochemical storage metal housing and battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN115911686A (en) |
| WO (1) | WO2023010781A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023010781A1 (en) * | 2021-08-06 | 2023-02-09 | 国研新能(深圳)技术有限公司 | Battery casing and battery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102647962B1 (en) * | 2018-07-13 | 2024-03-14 | 주식회사 엘지에너지솔루션 | Secondary battery and method for manufacturing the battery |
| CN109192889B (en) * | 2018-08-22 | 2024-01-26 | 珠海微矩实业有限公司 | Micro 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 |
| CN112467266B (en) * | 2020-11-30 | 2023-12-19 | 惠州市恒泰科技股份有限公司 | Preparation method of steel shell button cell and steel shell button cell |
| CN115911686A (en) * | 2021-08-06 | 2023-04-04 | 国研新能(深圳)技术有限公司 | Electrochemical storage metal housing and battery |
-
2021
- 2021-08-06 CN CN202211335163.6A patent/CN115911686A/en active Pending
- 2021-08-06 CN CN202110899666.5A patent/CN113611961A/en not_active Withdrawn
- 2021-12-27 WO PCT/CN2021/141446 patent/WO2023010781A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023010781A1 (en) * | 2021-08-06 | 2023-02-09 | 国研新能(深圳)技术有限公司 | Battery casing and battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115911686A (en) | 2023-04-04 |
| WO2023010781A1 (en) | 2023-02-09 |
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