CN216671729U - High-flatness lithium battery - Google Patents
High-flatness lithium battery Download PDFInfo
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- CN216671729U CN216671729U CN202122798331.2U CN202122798331U CN216671729U CN 216671729 U CN216671729 U CN 216671729U CN 202122798331 U CN202122798331 U CN 202122798331U CN 216671729 U CN216671729 U CN 216671729U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a high-flatness lithium battery, which comprises: the battery comprises a battery main body and a battery cover, wherein the battery main body comprises a positive plate, a negative plate, a positive tab, a negative tab, a diaphragm and a packaging shell, the positive plate and the negative plate are fixed on the packaging shell, the negative tab is fixed on the negative plate, and the diaphragm is positioned between the positive plate and the negative plate; the positive plate is provided with a positive current collector, and electrode paste is bonded on the positive current collector; the positive current collector is provided with a mounting position for setting a positive lug; the positive plate is provided with a groove used for being matched with the negative electrode lug, and the sectional area of the groove is larger than that of the negative electrode lug. In the embodiment of the utility model, the problem that the tab of the lithium battery is too thick is avoided, and the flatness of the lithium battery is improved.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a high-flatness lithium battery.
Background
Nowadays, ultra-thin flexible package lithium cell or ultra-thin polymer lithium cell use the positive pole and the lithium negative pole of single face pasting usually to make, because the intensity of lithium negative pole is low, yielding, so ultra-thin lithium area is difficult to adopt manual or conventional negative pole machine operation usually, and in the preparation lithium cell in-process, anodal ear and negative pole ear can be by lap welding on the positive pole and the negative pole of lithium cell, cause the thickness of lithium cell to increase, and also can see the sand grip of anodal ear or the sand grip of negative pole ear on the lithium cell packing, be unfavorable for the preparation of ultra-thin battery, also can not utilize the thickness space to the at utmost simultaneously, the high roughness lithium cell of mass production becomes the difficult problem of a puzzlement mill.
SUMMERY OF THE UTILITY MODEL
The utility model aims to at least solve one of the technical problems in the prior art, and provides a high-flatness lithium battery, which can avoid the phenomenon that the tab of the lithium battery is thicker and improve the flatness of the lithium battery.
The present invention provides a high-flatness lithium battery, including: the battery comprises a battery main body and a battery cover, wherein the battery main body comprises a positive plate, a negative plate, a positive tab, a negative tab, a diaphragm and a packaging shell, the positive plate and the negative plate are fixed on the packaging shell, the negative tab is fixed on the negative plate, and the diaphragm is positioned between the positive plate and the negative plate; the positive plate is provided with a positive current collector, and electrode paste is bonded on the positive current collector; the positive current collector is provided with an installation position for installing the positive lug in a matching way; the positive plate is provided with a groove used for being matched with the negative electrode lug, the sectional area of the groove is larger than that of the negative electrode lug, and the depth of the groove is larger than the thickness of the negative electrode lug.
The high-flatness lithium battery provided by the utility model at least has the following beneficial effects: set up installation position and recess and be convenient for reduce the shared space of utmost point ear welding, fully avoid utmost point ear stack and lead to the condition of lithium cell thickening, improve the space utilization of lithium cell, improve the battery volumetric specific energy.
According to some embodiments of the utility model, the installation position is arranged in the blank, so that the welding of the positive lug is facilitated, and the space occupied by the welding of the positive lug is reduced.
According to some embodiments of the present invention, the thickness of the negative electrode of the battery main body is 0.02 to 0.2 mm, and the electrode tabs are prevented from being stacked and thickened.
According to some embodiments of the present invention, the negative electrode sheet is a lithium negative electrode sheet or a lithium alloy negative electrode sheet, which facilitates reduction of the potential to the minimum.
According to some embodiments of the utility model, four top corners of the positive plate are all rounded corners, so that the packaging shell is prevented from being damaged by the sharp corners.
According to some embodiments of the utility model, the negative electrode tab is rivet-welded on the negative electrode plate, so that the negative electrode tab is firmly fixed on the negative electrode plate, and the firmness of the lithium battery is improved.
According to some embodiments of the utility model, the grooves are bonded with the electrode paste, so that the negative electrode tabs can be embedded conveniently, and the flatness of the lithium battery is improved.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
Fig. 1 is a schematic structural view of a high-flatness lithium battery provided in accordance with an embodiment of the present invention;
fig. 2 is a structural diagram of a rivet-welded negative tab according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present invention.
Reference numerals:
the battery comprises a battery body 100, a positive plate 200, a negative plate 300, a diaphragm 400, a mounting position 500, a groove 600, electrode paste 700, a positive tab 800, a negative tab 900 and a packaging shell 110.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The utility model will be further elucidated with reference to the drawing.
Referring to fig. 1, 2 and 3, fig. 1 is a schematic structural diagram of a high-flatness lithium battery according to an embodiment of the present invention, and the embodiment of the present invention provides a high-flatness lithium battery including: the battery body 100, the battery body 100 includes positive plate 200, negative plate 300, positive tab 800, negative tab 900, diaphragm 400 and packaging shell 110, the positive plate and negative plate are fixed on the packaging shell 110, the negative tab 900 is fixed on the negative plate 300, the diaphragm 400 is located between the positive plate 200 and the negative plate 300; the positive plate 200 is provided with a positive current collector, and the positive current collector is bonded with electrode paste 700; the positive current collector is provided with a mounting position 500 for matching and mounting the positive lug 800; the positive plate 200 is provided with the recess 600 that is used for matcing with negative pole ear 900, and the sectional area of recess 600 is greater than the sectional area of negative pole ear 900 to the degree of depth of recess 600 is greater than the thickness of negative pole ear 900, fully avoids utmost point ear stack and leads to the condition of lithium cell thickening, improves the space utilization of lithium cell, improves battery volumetric specific energy.
It can be understood that the positive tab 800 and the negative tab 900 are disposed in a staggered manner, so as to improve the working efficiency of the lithium battery and prevent the positive tab 800 and the negative tab 900 from overlapping to affect the output efficiency of the lithium battery.
The positive electrode sheet 200 may be manufactured in various ways, for example: coating the anode slurry on an aluminum foil, performing single-side gap coating, reserving a mounting position 500 and a groove 600 for welding an electrode lug, then performing drying operation and tabletting operation, designing the length, width and thickness according to specific model requirements, cutting into an anode plate 200, welding the anode lug 800 on the anode plate 200, flattening a welding spot and sticking high-temperature glue to protect the electrode lug welding position; if the positive electrode slurry is coated on the aluminum foil, single-side continuous coating is performed, then drying operation and tabletting operation are performed, the length, width and thickness dimensions are designed according to specific model requirements, the positive electrode sheet 200 is cut into the positive electrode sheet 200, the laser full powder cleaning operation is performed on the positive electrode sheet 200 to reserve the installation position 500 of the positive electrode tab 800, the laser partial powder cleaning operation is performed to reserve the groove 600 corresponding to the negative electrode tab 900, finally the positive electrode tab 800 is welded, the welding spot is flattened, and the high-temperature glue is pasted to protect the welding tab, so that the embodiment is not limited specifically.
In one embodiment, the mounting locations 500 are provided in the blank to reduce the space occupied by the weld positive tab 800.
It should be noted that there is no electrode paste on the blank, and the blank may be obtained by performing laser powder cleaning on the positive plate 200, or may be obtained by directly coating the positive plate 200, and the method of the powder cleaning is different according to the difference in the manufacturing method of the positive plate 200, for example, the blank may be obtained by performing partial laser powder cleaning on the positive plate 200, and for example, the blank may be obtained by performing full laser powder cleaning on the positive plate 200, or may be obtained by performing powder scraping, so the mounting position 500 also has no electrode paste, and this embodiment is not particularly limited.
In one embodiment, the thickness of the negative electrode of the battery main body 100 is 0.02 to 0.2 mm, which prevents the tabs from being overlapped and thickened, and prevents the short circuit or micro short circuit caused by the pressure applied during the use of the battery.
It should be noted that the thickness of the negative electrode of the lithium battery can be in the region of 0.02 mm to 0.2 mm, which corresponds to the thickness of the lithium battery body, so as to avoid the protrusion of the negative electrode tab 900 of the lithium battery, and improve the flatness of the lithium battery.
In one embodiment, the negative electrode tab 300 is a lithium negative electrode tab 300 or a lithium alloy negative electrode tab 300, which facilitates the reduction of the potential to the minimum.
It is understood that the standard reduction potential of metallic lithium is the lowest, and all the electrode potentials matched with lithium are higher than that of lithium, so that the negative electrode sheet 300 is the lithium negative electrode sheet 300 or the lithium alloy negative electrode sheet 300, so that the potential can be reduced to the lowest.
In one embodiment, the four top corners of the positive plate 200 are rounded corners, so as to prevent the sharp corners from damaging the package casing 110.
It should be noted that, during the process of rounding the positive electrode sheet 200 to obtain the rounded corners, there may be various ways, for example, the positive electrode sheet 200 may be cut by scissors or a cutter to round the corners by hand; for another example, a rounding machine may be used to cut the conventional positive electrode sheet 200 for rounding, and this embodiment is not particularly limited.
Referring to fig. 2, fig. 2 is a structural diagram of a rivet welding negative electrode tab according to an embodiment of the present invention.
In one embodiment, the negative electrode tab 900 is rivet welded to the negative electrode sheet 300, so that the negative electrode tab 900 is firmly fixed to the negative electrode sheet 300, and the firmness of the lithium battery is improved.
In one embodiment, the grooves 600 are adhered with the electrode paste 700, so that the negative electrode tabs 900 can be easily embedded, and the flatness of the lithium battery can be improved.
It can be understood that the groove 600 is obtained by performing a local powder cleaning operation on the positive electrode plate 200, so that the electrode paste 700 is also adhered to the groove 600, and the welding area of the negative electrode tab 900 corresponds to the groove 600, thereby preventing the discharge and dissolution of the lithium band around the negative electrode tab 900 and ensuring sufficient discharge capacity.
In one embodiment, the depth of the groove 600 is greater than the thickness of the negative tab 900, so that the space utilization rate of the lithium battery is improved, and the volumetric specific energy of the battery is improved.
It can be understood that the depth of the groove 600 is greater than the thickness of the negative electrode tab 900, so that the condition that the negative electrode tab 900 of the ion battery is raised due to welding of the negative electrode tab 900 can be reduced, the occupied space for tab welding is reduced, the tabs are prevented from being overlapped and thickened, and the space utilization rate is improved.
In order to more clearly illustrate the high-flatness lithium battery provided by the present embodiment, a specific example is described below, and the following example is merely used for explaining the operation principle of the battery and belongs to the prior art in the field.
Example one:
manufacturing the positive electrode sheet 200: coating manganese dioxide anode slurry on an aluminum foil, performing single-side continuous coating, then performing drying and tabletting operation, cutting an anode plate 200 according to the model, wherein the length of the anode plate 200 in the example is 34.5mm, the width is 13.5mm, the thickness is 0.18mm, performing laser full-cleaning on the anode plate 200 to reserve an anode tab 800 welding position, wherein the laser part is cleaned to reserve a cathode tab 900 corresponding position, the length of the cathode tab 900 corresponding position is 16mm, the width is 4mm, the depth is 0.06mm, performing fillet R1.5mm on four corners of the anode plate 200, finally performing ultrasonic welding on the anode tab 800 of the aluminum-nickel conversion, flattening welding points and pasting high-temperature glue to protect the welding tab positions.
Manufacturing the negative electrode sheet 300: the negative electrode piece 300 is cut according to the model in a drying room or a glove box, in the example, the length of the negative electrode piece 300 is 34mm, the width is 13mm, the thickness is 0.05mm, the negative electrode tab 900 is riveted on the set part of the negative electrode piece 300, the length of the negative electrode tab 900 riveted on the negative electrode is 15mm, the width is 3mm, and the thickness is 0.05 mm.
Manufacturing the diaphragm 400: the separator 400 is cut according to the length, width and thickness of the model design.
Shell punching: and (3) stamping and forming the aluminum plastic film with the thickness of 0.088mm by using a shell stamping die to form the packaging shell 110.
Laminating: and (3) stacking the positive plate 200, the diaphragm 400 and the negative plate 300 in the packaging shell 110 to form a battery cell. The negative electrode tab 900 riveted on the negative electrode can be embedded into the laser part on the positive electrode to remove powder and leave the corresponding position of the negative electrode tab 900.
Packaging: and (3) wrapping the battery cell by turning over the back of the packaging shell 110, performing top sealing and side sealing, injecting liquid, performing first sealing, pre-discharging, aging and second sealing to obtain the ultrathin lithium battery capable of preventing the electrode lug from being thicker, wherein the thickness of the finally obtained lithium battery is about 0.426 mm.
Example two:
coating lithium cobaltate anode slurry on an aluminum foil, performing single-side gap coating, then performing drying and tabletting operations, cutting an anode sheet 200 according to the model, wherein the length of the anode sheet 200 is 21mm, the width of the anode sheet is 18mm, the thickness of the anode sheet is 0.12mm, a welding position of an anode tab 800 is reserved by coating, a powder cleaning operation of a laser part is performed to reserve a position corresponding to a cathode tab 900, the length of the position corresponding to the cathode tab 900 is 10mm, the width of the position corresponding to the cathode tab 900 is 4mm, and the depth of the position is 0.06 mm; and finally, ultrasonically welding the aluminum-nickel-converted positive lug 800, flattening the welding point and sticking high-temperature glue to protect the welding lug.
Manufacturing the negative plate 300: the negative electrode piece 300 is cut in a drying room or a glove box according to the model number, in the example, the length of the negative electrode piece 300 is 21.5mm, the width is 18.5mm, the thickness is 0.05mm, the negative electrode tab 900 is riveted and welded on the set part of the negative electrode piece 300, the length of the negative electrode tab 900 riveted on the negative electrode is 9mm, the width is 3mm, and the thickness is 0.05 mm.
Manufacturing the diaphragm 400: the separator 400 is cut according to the length, width and thickness of the model design.
Shell punching: and (3) punching and forming the aluminum plastic film with the thickness of 0.073mm by using a shell punching die to form the packaging shell 110.
Laminating: the positive plate 200, the diaphragm 400 and the negative plate 300 are stacked in the packaging shell 110 to form a battery core. The negative electrode tab 900 riveted on the negative electrode can be embedded into the laser part on the positive electrode to remove powder and leave the corresponding position of the negative electrode tab 900.
Packaging: and the back of the packaging shell 110 is turned over to wrap the battery cell, top sealing and side sealing are performed, liquid injection, first sealing, pre-charging, aging, second sealing and capacity grading are performed, the ultrathin lithium battery capable of preventing the electrode lug from being thicker is obtained, and the thickness of the finally obtained lithium battery is about 0.426 mm.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (7)
1. A high-flatness lithium battery, comprising:
the battery comprises a battery main body, a battery cover and a battery cover, wherein the battery main body comprises a positive plate, a negative plate, a positive tab, a negative tab, a diaphragm and a packaging shell, the positive plate and the negative plate are fixed on the packaging shell, the negative tab is fixed on the negative plate, and the diaphragm is positioned between the positive plate and the negative plate;
the positive plate is provided with a positive current collector, and electrode paste is bonded on the positive current collector;
the positive electrode current collector is provided with a mounting position for mounting the positive electrode lug in a matching manner;
the positive plate is provided with a groove used for being matched with the negative electrode lug, the sectional area of the groove is larger than that of the negative electrode lug, and the depth of the groove is larger than the thickness of the negative electrode lug.
2. The high-flatness lithium battery as claimed in claim 1, wherein the mounting position is provided at a blank.
3. The high-flatness lithium battery as claimed in claim 1, wherein the negative electrode of the battery main body has a thickness of 0.02 to 0.2 mm.
4. The high-flatness lithium battery of claim 1, wherein the negative electrode sheet is a lithium negative electrode sheet or a lithium alloy negative electrode sheet.
5. The high-flatness lithium battery as claimed in claim 1, wherein four top corners of the positive electrode sheet are rounded.
6. The high-flatness lithium battery as claimed in claim 1, wherein the negative electrode tab is rivet welded to the negative electrode sheet.
7. The high-flatness lithium battery as claimed in claim 1, wherein an electrode paste is adhered to the grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122798331.2U CN216671729U (en) | 2021-11-15 | 2021-11-15 | High-flatness lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122798331.2U CN216671729U (en) | 2021-11-15 | 2021-11-15 | High-flatness lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216671729U true CN216671729U (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122798331.2U Active CN216671729U (en) | 2021-11-15 | 2021-11-15 | High-flatness lithium battery |
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| CN (1) | CN216671729U (en) |
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2021
- 2021-11-15 CN CN202122798331.2U patent/CN216671729U/en active Active
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