CN116779978A - Lithium battery and packaging method - Google Patents
Lithium battery and packaging method Download PDFInfo
- Publication number
- CN116779978A CN116779978A CN202210237859.9A CN202210237859A CN116779978A CN 116779978 A CN116779978 A CN 116779978A CN 202210237859 A CN202210237859 A CN 202210237859A CN 116779978 A CN116779978 A CN 116779978A
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- shell
- cover plate
- adhesive layer
- bonding adhesive
- lithium battery
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 42
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 65
- 239000012790 adhesive layer Substances 0.000 claims abstract description 54
- 238000004026 adhesive bonding Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 abstract description 9
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003292 glue Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 238000000576 coating method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 239000000565 sealant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
-
- 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
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/134—Hardness
-
- 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
-
- 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
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- 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
- H01M50/183—Sealing members
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a lithium battery and a packaging method, comprising a cover plate, a shell and a bonding adhesive layer, wherein the cover plate is provided with cover plate concave patterns; the shell is provided with shell stripes and is provided with chamfers; and the bonding adhesive layer cover plate is combined with the shell body cover and is welded, and the bonding adhesive layer fills a gap between the cover plate and the shell body after being welded. The cover plate concave patterns and the shell stripes play a role of reinforcing ribs, so that the rigidity of the cover plate and the shell is increased, and the deformation probability of the cover plate and the shell after welding and packaging is reduced; the shell chamfer can improve the positioning accuracy of the shell and the cover plate, and the bonding adhesive layer is heated to melt and fill the gap between the cover plate and the shell when the cover plate is welded with the shell, so that the bonding adhesive layer is uniformly distributed around the welding mark, and the bonding adhesive layer is solidified along with the cooling of the welding mark, thereby forming a sealing layer. The invention is beneficial to improving the tightness and the safety of the battery and forms a lithium battery with good quality and safety.
Description
Technical Field
The invention belongs to the field of semiconductors, and relates to a lithium battery and a packaging method.
Background
In recent years, green and environment-friendly new energy sources are coming into the era of high-speed development, and the lithium battery is widely applied as a novel energy storage device because of the characteristics of high energy density, long cycle life, stable output voltage, less self-discharge, no pollution and the like.
The lithium battery industry is rapidly developed at present, the development of the lithium battery is rapid, along with the progress of technology, the power battery is a main stream at present, wherein the lithium battery generally comprises an electric core and a shell for packaging the electric core, and the existing shell is generally made of an aluminum plastic film, an aluminum shell or a steel shell.
In the whole manufacturing process of the lithium battery, welding and packaging are very critical procedures, however, when the frame or the shell is used for packaging the battery core, on one hand, the frame or the shell is lower in strength and poorer in compression resistance; on the other hand, the positioning is not accurate enough during packaging or welding, liquid leakage is easy to cause, and high potential safety hazards exist; and after welding or packaging is finished, the deformation risk of the battery cell body is high, and the product quality is affected.
Therefore, in order to cope with the current high-speed development of electronic products and the power battery market with the greatly increased demand, a lithium battery and a packaging method are provided, which are necessary.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a lithium battery and a packaging method for solving the above-mentioned problems of the welding packaging of the lithium battery in the prior art.
To achieve the above and other related objects, the present invention provides a lithium battery packaging method, comprising the steps of:
providing a cover plate, stamping the cover plate, and forming cover plate concave patterns in the edge area of the cover plate;
gluing the cover plate to form a bonding adhesive layer positioned on the outer side of the concave patterns of the cover plate;
providing a shell, stamping the edge area of the shell, and forming shell stripes on the shell;
forming a chamfer on the inner side of a frame of the shell;
taking the bonding adhesive layer and the chamfer as positioning references, and combining the bonding adhesive layer to cover the cover plate and the shell;
positioning and clamping the cover plate with the cover and the shell;
and welding the cover plate and the shell, wherein the cover plate is positioned and clamped, and the bonding adhesive layer fills a gap between the cover plate and the shell after welding.
Optionally, the distance between the concave patterns of the cover plate and the edge of the cover plate is 1mm-10mm; and/or the depth of the concave patterns of the cover plate is 0.1mm-1mm; and/or the width of the concave patterns of the cover plate is 0.1mm-1mm; and/or the distance between the shell stripes and the edge of the shell is 1mm-5mm; and/or the depth of the shell stripes is 0.1mm-2mm; and/or the width of the shell stripes is 0.1mm-1mm.
Optionally, the cover plate concave patterns are intermittent cover plate concave patterns or continuous cover plate concave patterns; and/or the shell stripes are intermittent shell stripes or continuous shell stripes.
Optionally, the shell stripe is a shell relief or a shell pit.
Optionally, the concave patterns of the cover plate comprise N pieces, N is more than or equal to 1, and the pattern appearance formed by the concave patterns of the cover plate comprises one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a round shape; and/or the shell stripes comprise M strips, M is more than or equal to 1, and the grain morphology formed by the shell stripes comprises one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a round shape.
Optionally, the thickness of the bonding adhesive layer is 0.1mm-1mm, and the width of the bonding adhesive layer is 0.2mm-1mm; and/or the gluing mode of the bonding adhesive layer is one or a combination of gap gluing and continuous gluing.
Optionally, the chamfer is an R angle or a C angle; and/or the chamfer has a width of 0.1mm to 0.4mm.
Optionally, the welding includes laser welding, and the welding mode of the laser welding is symmetrical intermittent welding.
The present invention also provides a lithium battery including:
the edge area of the cover plate is provided with cover plate concave patterns;
the shell is provided with shell stripes in the edge area, and the inner side of the frame of the shell is provided with a chamfer;
the chamfer is combined with the bonding adhesive layer to enable the cover plate to be covered with the shell, the cover plate is connected with the shell in a welding mode, and the bonding adhesive layer fills a gap between the cover plate and the shell after being welded.
Optionally, the chamfer is an R angle or a C angle; and/or the chamfer has a width of 0.1mm to 0.4mm.
As described above, the lithium battery and the packaging method of the invention include a cover plate, a shell and a bonding glue layer, wherein the edge area of the cover plate is provided with cover plate concave patterns; the edge area of the shell is provided with shell stripes, and the inner side of the frame of the shell is provided with a chamfer; the cover plate and the shell are combined by the bonding adhesive layer, the cover plate and the shell are connected by welding, and the bonding adhesive layer fills a gap between the cover plate and the shell after being welded.
According to the lithium battery and the packaging method, the cover plate concave patterns are formed on the cover plate, and the shell stripes are formed on the shell, so that the cover plate concave patterns and the shell stripes play a role of reinforcing ribs, the rigidity of the cover plate and the shell is increased, and the deformation probability of the cover plate and the shell after welding and packaging is reduced; and the inside chamfer that forms of frame of casing, the chamfer combines the bonding glue film will the apron with the casing closes the lid, improves the casing with the positioning accuracy of apron, just the bonding glue film is in the apron with the casing is heated when welding and melts and pack the apron with clearance between the casing makes bonding glue film evenly distributed around the welding seal, and along with the welding seal cooling, bonding glue film solidification to form the sealing layer, be favorable to improving the leakproofness and the security of battery.
The lithium battery and the packaging method can solve the adverse effects of poor welding positioning precision, welding leakage, battery deformation and the like of the lithium battery, and form the lithium battery with good quality and safety.
Drawings
Fig. 1 is a schematic flow chart of a method for packaging a lithium battery according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a cover plate after the shell is glued according to an embodiment of the present invention.
Fig. 3 is an enlarged schematic view of the area a in fig. 2.
Fig. 4 is a schematic diagram showing the distribution of the bonding adhesive layer on the cover plate according to an embodiment of the invention.
Fig. 5 is a schematic view of a structure of a shell after forming a chamfer in the embodiment of the invention.
Fig. 6 is a schematic structural diagram of the cover plate and the shell after the cover is welded according to the embodiment of the invention.
Description of element reference numerals
100. Cover plate
101. Concave pattern of cover plate
200. Bonding adhesive layer
300. Shell body
301. Shell stripe
302. Chamfering tool
S1 to S7 steps
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
As described in detail in the embodiments of the present invention, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of explanation, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
For ease of description, spatially relative terms such as "under", "below", "beneath", "above", "upper" and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Furthermore, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or one or more intervening layers may also be present. In this regard, when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Such as "between … …" may be used herein, the expression including both end values, and such as "a plurality" may be used, the expression indicating two or more, unless specifically defined otherwise. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be changed at will, and the layout of the components may be more complex.
As shown in fig. 1, the embodiment provides a lithium battery packaging method, which includes the following steps:
s1: providing a cover plate, stamping the cover plate, and forming cover plate concave patterns in the edge area of the cover plate;
s2: gluing the cover plate to form a bonding adhesive layer positioned on the outer side of the concave patterns of the cover plate;
s3: providing a shell, stamping the edge area of the shell, and forming shell stripes on the shell;
s4: forming a chamfer on the inner side of a frame of the shell;
s5: taking the bonding adhesive layer and the chamfer as positioning references, and combining the bonding adhesive layer to cover the cover plate and the shell;
s6: positioning and clamping the cover plate with the cover and the shell;
s7: and welding the cover plate and the shell, wherein the cover plate is positioned and clamped, and the bonding adhesive layer fills a gap between the cover plate and the shell after welding.
The following describes the packaging process of the lithium battery with reference to fig. 2 to 6, specifically including:
first, as shown in fig. 2 and 3, step S1 is performed: a cover plate 100 is provided, the cover plate 100 is punched, and cover plate concave patterns 101 are formed in the edge area of the cover plate 100.
Specifically, the concave patterns 101 of the cover plate can act as reinforcing ribs to increase the rigidity of the cover plate 100 and reduce the deformation probability of the cover plate 100 after welding and packaging.
As an example, the cover plate intaglio 101 may be spaced from the edge of the cover plate 100 by a distance of 1mm to 10mm; and/or the depth of the cover plate intaglio 101 may be 0.1mm-1mm; and/or the cover plate intaglio 101 may have a width of 0.1mm-1mm.
Specifically, the thickness of the cover plate 100 may be 0.1mm-2mm, such as 0.1mm, 0.5mm, 1mm, 2mm, etc.; the distance between the cover plate concave patterns 101 and the edge of the cover plate 100 can be 1mm, 2mm, 5mm, 8mm, 10mm, etc., and the distance is preferably 2mm in this embodiment; and/or the depth of the cover plate concave patterns 101 may be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., and the embodiment is preferably 0.2mm; and/or the width of the cover plate intaglio 101 may be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., and this embodiment is preferably 0.2mm. The choice of the dimensions of the cover plate 100 and the cover plate indentation 101 is not excessively restricted here.
As an example, the cover plate intaglio 101 may be an intermittent cover plate intaglio or a continuous cover plate intaglio.
For example, the cover plate concave patterns 101 may include N pieces, N is greater than or equal to 1, and the pattern morphology formed by the cover plate concave patterns 101 may include one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a circular shape, where the value of N may be 1, 2, 5, etc. In this embodiment, the cover plate 100 is punched with a circle of concave patterns on the surface of the cover plate 100, but the number and the shape of the concave patterns 101 of the cover plate are not limited thereto, and may be a plurality of concave patterns, and the shape may include other irregular shapes, which is not limited thereto.
Next, as shown in fig. 2 and 3, step S2 is performed: and gluing the cover plate 100 to form a bonding adhesive layer 200 positioned on the outer side of the cover plate concave patterns 101.
As an example, the thickness of the bonding adhesive layer 200 may be 0.1mm to 1mm, and the width of the bonding adhesive layer 200 may be 0.2mm to 1mm; and/or the bonding adhesive layer 200 may be applied by one or a combination of gap-applied and continuous applied.
Specifically, when the cover plate 100 after the shell is punched is glued, the glue-spreading positions are distributed on the outer side of the cover plate concave grain 101, as shown in fig. 3, and preferably distributed uniformly along the outer side edge of the cover plate concave grain 101, as shown in fig. 4. The thickness of the bonding adhesive layer 200 may be, for example, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., preferably 0.2mm in this embodiment, and the width of the bonding adhesive layer 200 may be, for example, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., where the adhesive coating manner may be one or a combination of gap adhesive coating and continuous adhesive coating, that is, in the actual adhesive coating process, the bonding adhesive layer 200 may be formed in a ring shape by adopting a continuous adhesive coating manner on the outer side of the cover plate concave pattern 101, or the bonding adhesive layer 200 may be formed by adopting a spacing adhesive coating manner on the outer side of the cover plate concave pattern 101, that is, the bonding adhesive layer 200 formed after adhesive coating may be continuous or discontinuous. In this embodiment, the bonding adhesive layer 200 is made of a mixed adhesive, and the bonding adhesive layer 200 is preferably made of a sealant with characteristics of corrosion resistance, aging resistance, high strength, good elasticity, stable adhesion, tear resistance, puncture resistance, and the like, wherein the sealant can be cured after being coated, so that the subsequent cap closing positioning operation is facilitated.
Next, as shown in fig. 5, step S3 is performed: a case 300 is provided, and a case stripe 301 is formed on the case 300 by pressing an edge region of the case 300.
Specifically, the shell strips 301 may act as reinforcing ribs to increase the rigidity of the shell 300 and reduce the deformation probability of the shell 300 after being welded and packaged.
As an example, the housing stripe 301 may be 1mm-5mm from the edge of the housing 300; and/or the depth of the shell stripes 301 may be 0.1mm-2mm; and/or the width of the shell stripes 301 may be 0.1mm-1mm.
Specifically, the thickness of the housing 300 may be compatible with 0.1mm-2mm, such as 0.1mm, 0.5mm, 1mm, 2mm, etc.; the distance between the shell stripe 301 and the edge of the shell 300 may be 1mm, 2mm, 5mm, etc., and is preferably 2mm in this embodiment; and/or the depth of the shell stripes 301 may be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., with 0.5mm being preferred in this embodiment; and/or the width of the cover plate intaglio 101 may be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, etc., and this embodiment is preferably 0.2mm. The choice of the dimensions of the housing 300 and the housing strips 301 is not excessively restricted here.
As an example, the shell stripe 301 may be an intermittent cover plate intaglio or a continuous shell stripe.
As an example, the shell stripe 301 may include M pieces, M is greater than or equal to 1, and the texture formed by the shell stripe 301 may include one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a circular shape, wherein the value of M may be 1, 2, 5, etc. In this embodiment, the shell of the shell 300 is formed by punching a circle of concave patterns on the surface of the shell 300, but the number and the shape of the shell stripes 301 are not limited thereto, and may be a plurality of strips, and the shape may include other irregular shapes, which is not limited thereto.
The shell stripe 301 is, for example, a shell ridge or a shell valley, and in this embodiment, a shell valley is preferred, but not limited thereto, and may be selected according to needs, and is not limited thereto.
Next, as shown in fig. 5, step S4 is performed: a chamfer 302 is formed on the inside of the frame of the housing 300.
Specifically, the chamfer 302 is a cutting operation performed on the inner side of the frame of the housing 300 for one circle, wherein the chamfer 302 may be an R angle or a C angle; the width of the chamfer 302 may be 0.1mm-0.4mm, such as 0.1mm, 0.3mm, 0.4mm, etc., the specific range may be set according to the frame thickness of the housing 300, and the chamfer 302 may be an arc R angle, or a C angle with an inclined plane, so that the positioning accuracy of the frame of the housing 300 and the cover plate 100 is improved by the chamfer 302, so that the frame of the housing 300 and the cover plate 100 may be well positioned and covered and welded by the bonding adhesive layer 200.
Next, as shown in fig. 6, step 5: and taking the bonding adhesive layer 200 and the chamfer 302 as positioning references, and combining the bonding adhesive layer 200 to cover the cover plate 100 and the shell 300.
Specifically, when the cover closing operation is performed, the housing 300 loaded with the battery cell may be first placed on a working platform, then the cover plate 100 is horizontally placed on the surface of the housing 300, and the bonding adhesive layer 200 and the chamfer 302 are used as positioning references, so that the edge of the frame of the housing 300 is aligned with the cover plate 100 to perform the cover closing operation.
Next, as shown in fig. 6, step 6: and positioning and clamping the cover plate 100 and the shell 300.
Specifically, the cover plate 100 and the housing 300 may be positioned and fixed by using a clamping tool or a wire harness binding manner, so as to prevent displacement of the cover plate 100 and the housing 300 during subsequent welding, thereby improving welding precision. The casing 300 may be fixed first, then the edge of the cover plate 100 is aligned with the edge of the casing 300, positioning around the casing by a fixture, and then pressing and clamping are performed, where the clamping modes may be pneumatic, hydraulic, etc.
Next, as shown in fig. 6, step 7: and welding the cover plate 100 and the shell 300 which are positioned and clamped, wherein the bonding adhesive layer 200 fills a gap between the cover plate 100 and the shell 300 after welding.
As an example, the welding may include laser welding, and the welding manner of the laser welding is symmetrical intermittent welding.
Specifically, in this embodiment, the welding is laser welding, and the welding mode is symmetrical intermittent welding, that is, short sides are welded first and long sides are welded later, and by multiple symmetrical intermittent welding, welding deformation of the battery core body can be effectively reduced.
Further, the welding area is divided into several parts to facilitate the release of welding stress and reduce deformation.
Furthermore, the welding surface is preferably cooled by inert gas matched with the welding surface during welding, so that the sealant is melted by utilizing laser heat during welding, the sealant is uniformly distributed along the welding mark after being dissolved into liquid state, and the sealant is solidified after the welding mark is cooled, thereby being beneficial to improving the sealing effect of the battery.
As shown in fig. 6, the present embodiment further provides a lithium battery including:
a cover plate 100, wherein cover plate concave patterns 101 are formed on the edge area of the cover plate 100;
a case 300 having case stripes 301 on an edge region of the case 300, and a chamfer 302 on an inner side of a frame of the case 300;
and the bonding adhesive layer 200, the chamfer 302 is combined with the bonding adhesive layer 200 to cover the cover plate 100 and the shell 300, the cover plate 100 and the shell 300 are connected by welding, and the bonding adhesive layer 200 fills a gap between the cover plate 100 and the shell 300 after welding.
As an example, the chamfer may be an R angle or a C angle; and/or the chamfer has a width of 0.1mm to 0.4mm.
The above description of the method for packaging the lithium battery can be referred to herein, and is not limited thereto.
In summary, according to the lithium battery and the packaging method of the invention, the lithium battery comprises a cover plate, a shell and a bonding adhesive layer, wherein the edge area of the cover plate is provided with cover plate concave patterns; the edge area of the shell is provided with shell stripes, and the inner side of the frame of the shell is provided with a chamfer; the cover plate and the shell are combined by the bonding adhesive layer, the cover plate and the shell are connected by welding, and the bonding adhesive layer fills a gap between the cover plate and the shell after being welded.
According to the lithium battery and the packaging method, the cover plate concave patterns are formed on the cover plate, and the shell stripes are formed on the shell, so that the cover plate concave patterns and the shell stripes play a role of reinforcing ribs, the rigidity of the cover plate and the shell is increased, and the deformation probability of the cover plate and the shell after welding and packaging is reduced; and the inside chamfer that forms of frame of casing, the chamfer combines the bonding glue film will the apron with the casing closes the lid, improves the casing with the positioning accuracy of apron, just the bonding glue film is in the apron with the casing is heated when welding and melts and pack the apron with clearance between the casing makes bonding glue film evenly distributed around the welding seal, and along with the welding seal cooling, bonding glue film solidification to form the sealing layer, be favorable to improving the leakproofness and the security of battery.
The lithium battery and the packaging method can solve the adverse effects of poor welding positioning precision, welding leakage, battery deformation and the like of the lithium battery, and form the lithium battery with good quality and safety.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. The lithium battery packaging method is characterized by comprising the following steps of:
providing a cover plate, stamping the cover plate, and forming cover plate concave patterns in the edge area of the cover plate;
gluing the cover plate to form a bonding adhesive layer positioned on the outer side of the concave patterns of the cover plate;
providing a shell, stamping the edge area of the shell, and forming shell stripes on the shell;
forming a chamfer on the inner side of a frame of the shell;
taking the bonding adhesive layer and the chamfer as positioning references, and combining the bonding adhesive layer to cover the cover plate and the shell;
positioning and clamping the cover plate with the cover and the shell;
and welding the cover plate and the shell, wherein the cover plate is positioned and clamped, and the bonding adhesive layer fills a gap between the cover plate and the shell after welding.
2. The lithium battery packaging method according to claim 1, wherein: the distance between the concave patterns of the cover plate and the edge of the cover plate is 1mm-10mm; and/or the depth of the concave patterns of the cover plate is 0.1mm-1mm; and/or the width of the concave patterns of the cover plate is 0.1mm-1mm; and/or the distance between the shell stripes and the edge of the shell is 1mm-5mm; and/or the depth of the shell stripes is 0.1mm-2mm; and/or the width of the shell stripes is 0.1mm-1mm.
3. The lithium battery packaging method according to claim 1, wherein: the cover plate concave patterns are intermittent cover plate concave patterns or continuous cover plate concave patterns; and/or the shell stripes are intermittent shell stripes or continuous shell stripes.
4. The lithium battery packaging method according to claim 1, wherein: the shell stripes are shell convex patterns or shell concave patterns.
5. The lithium battery packaging method according to claim 1, wherein: the concave patterns of the cover plate comprise N pieces, N is more than or equal to 1, and the patterns formed by the concave patterns of the cover plate comprise one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a round shape; and/or the shell stripes comprise M strips, M is more than or equal to 1, and the grain morphology formed by the shell stripes comprises one or a combination of a straight line shape, a cross shape, a triangle shape, a quadrilateral shape and a round shape.
6. The lithium battery packaging method according to claim 1, wherein: the thickness of the bonding adhesive layer is 0.1mm-1mm, and the width of the bonding adhesive layer is 0.2mm-1mm; and/or the gluing mode of the bonding adhesive layer is one or a combination of gap gluing and continuous gluing.
7. The lithium battery packaging method according to claim 1, wherein: the chamfer is an R angle or a C angle; and/or the chamfer has a width of 0.1mm to 0.4mm.
8. The lithium battery packaging method according to claim 1, wherein: the welding comprises laser welding, and the welding mode of the laser welding is symmetrical intermittent welding.
9. A lithium battery, the lithium battery comprising:
the edge area of the cover plate is provided with cover plate concave patterns;
the shell is provided with shell stripes in the edge area, and the inner side of the frame of the shell is provided with a chamfer;
the chamfer is combined with the bonding adhesive layer to enable the cover plate to be covered with the shell, the cover plate is connected with the shell in a welding mode, and the bonding adhesive layer fills a gap between the cover plate and the shell after being welded.
10. The lithium battery of claim 9, wherein: the chamfer is an R angle or a C angle; and/or the chamfer has a width of 0.1mm to 0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237859.9A CN116779978A (en) | 2022-03-11 | 2022-03-11 | Lithium battery and packaging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237859.9A CN116779978A (en) | 2022-03-11 | 2022-03-11 | Lithium battery and packaging method |
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| Publication Number | Publication Date |
|---|---|
| CN116779978A true CN116779978A (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210237859.9A Pending CN116779978A (en) | 2022-03-11 | 2022-03-11 | Lithium battery and packaging method |
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| Country | Link |
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| CN (1) | CN116779978A (en) |
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