CN215834603U - Soft package lithium ion battery capable of improving volume energy density - Google Patents
Soft package lithium ion battery capable of improving volume energy density Download PDFInfo
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- CN215834603U CN215834603U CN202121745220.9U CN202121745220U CN215834603U CN 215834603 U CN215834603 U CN 215834603U CN 202121745220 U CN202121745220 U CN 202121745220U CN 215834603 U CN215834603 U CN 215834603U
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- lithium ion
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a soft package lithium ion battery capable of improving volume energy density, which comprises a naked battery cell consisting of a positive pole piece, a negative pole piece and a diaphragm, wherein the surface of the naked battery cell is coated with an aluminum plastic film, and the aluminum plastic film is used for packaging the naked battery cell; the battery comprises a bare cell, a battery cover and a battery cover, wherein the battery cover is provided with a battery cover; the aluminum plastic films on the areas which are not sealed with the glue overflowing area outside the two sides of the positive pole lug and the negative pole lug are completely cut off; the utility model provides a soft package lithium ion battery capable of improving volume energy density; the lithium ion battery volume energy density can be improved, and the production efficiency is higher.
Description
Technical Field
The utility model relates to the technical field of soft package lithium ion batteries, in particular to a soft package lithium ion battery capable of improving volume energy density.
Background
The soft package lithium ion battery adopts a lightweight aluminum-plastic film as a battery shell material, and the battery is sealed by heating and melting a polypropylene layer inside the aluminum-plastic film, so that the soft package lithium ion battery has the characteristics of high energy density, high safety performance and flexible appearance designability, and is widely applied in the fields of 3C, energy storage and power batteries.
Compared with 3C consumer batteries, power batteries generally require large current charging and discharging, so thicker and wider tabs are required to ensure power performance. At present, a soft package power battery usually adopts a direct welding process to weld tabs, an outer non-sealed glue overflowing area, a sealed area and an inner non-sealed area exist at the top of a battery core, the width of the non-utilized area is about 13-18 mm, and the volume energy density of the battery is reduced to a certain extent.
The implementation method in the prior art is as follows: and cutting off the un-sealed glue overflow area and part of the sealing area outside the top of the packaged semi-finished product battery cell, and simultaneously reserving enough sealing area to ensure the packaging reliability, so that more active substances can be designed and contained in the same volume space, and the battery prepared by the method has higher volume energy density.
Although the volume energy density of the battery can be improved to a certain extent by cutting the outer non-seal overflow glue area and part of the seal area, the outer non-seal overflow glue area is only 1-3 mm, so that the cut area of the seal area is limited in order to ensure the effective seal width, and the actual energy density improvement effect is not obvious.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a soft package lithium ion battery capable of improving the volume energy density; the lithium ion battery volume energy density can be improved, and the production efficiency is higher.
In order to achieve the purpose, the utility model provides a soft-package lithium ion battery capable of improving volume energy density, which comprises a naked battery cell consisting of a positive pole piece, a negative pole piece and a diaphragm, wherein the surface of the naked battery cell is coated with an aluminum-plastic film, and the aluminum-plastic film is used for packaging the naked battery cell; the battery comprises a bare cell, a battery cover and a battery cover, wherein the battery cover is provided with a battery cover; and the aluminum plastic films on the areas which are not sealed with the glue overflowing area outside the two sides of the anode tab and the cathode tab are completely cut off.
Preferably, the top sealing area is formed by packaging the naked electric core by using an L-shaped end enclosure; or the naked electric core is encapsulated by using a convex end socket.
Preferably, the outer non-sealing glue overflowing area is formed by cutting off aluminum plastic films on two sides of the positive electrode lug and the negative electrode lug by using an L-shaped cutter.
Preferably, a positive pole tab glue is arranged between the positive pole tab and the aluminum plastic film, and the distance between the positive pole tab glue and the L-shaped sealing area is 0-3 mm;
and a negative pole tab glue is arranged between the negative pole tab and the aluminum plastic film, and the distance between the negative pole tab glue and the L-shaped sealing area is also between 0mm and 3 mm.
Preferably, the width of the inner unsealed area is between 0mm and 3 mm; the width of the L-shaped sealing area is between 3mm and 8 mm.
Preferably, the positive electrode tab and the negative electrode tab are the same-side tabs or different-side tabs.
Preferably, the L-shaped end socket and the convex end socket are both provided with a fillet, and the radius of the fillet is between 1mm and 8 mm.
Preferably, the intersection position of the L-shaped cutting knife is provided with a fillet, and the radius of the fillet is between 1mm and 8 mm.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the naked battery cell is packaged by using the L-shaped seal head or the convex seal head to form the top sealing area of the naked battery cell, and the aluminum plastic films on the areas which are not sealed by glue overflow and are arranged outside the two sides of the positive electrode lug and the negative electrode lug are completely cut off, so that the space occupied by the soft package lithium ion battery is reduced, the volume energy density is improved, and the production efficiency is higher; meanwhile, a channel or a space left after the non-sealed glue overflow area is cut off can be used as an air-cooled heat dissipation flow channel of the soft package lithium ion battery, the air-cooled heat dissipation effect of the soft package lithium ion battery is improved, a power wire harness can be arranged in the channel or the space, and the space utilization rate of the soft package lithium ion battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a front view of a soft-package lithium ion battery provided by the present invention, which can improve the volumetric energy density;
FIG. 2 is an enlarged schematic view of I in FIG. 1;
FIG. 3 is a schematic view of a "convex" head package according to a first embodiment of the present invention;
FIG. 4 is a schematic cut-away view of an "L-shaped" cutting blade according to a first embodiment of the present invention;
FIG. 5 is a prior art package of a fourth embodiment of the present invention;
FIG. 6 is a schematic view of an "L-shaped" end enclosure package according to a fourth embodiment of the present invention;
fig. 7 is a schematic cut-away view of an "L-shaped" cutter according to a fourth embodiment of the present invention.
The figure includes:
3-top sealing area, 31- 'L-shaped' sealing area, 32-inner non-sealing area, 33-outer non-sealing glue overflowing area, 1-anode tab, 2-cathode tab, 5- 'L-shaped' end socket, 6- 'convex' end socket, 7- 'L-shaped' cutter, 11-anode tab glue, 21-cathode tab glue and 41-first strip-shaped sealing area.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Example one
Referring to fig. 1 to 4, a soft-package lithium ion battery capable of increasing a volumetric energy density is provided in an embodiment of the present invention.
The soft package lithium ion battery comprises a naked battery cell consisting of a positive pole piece, a negative pole piece and a diaphragm, wherein an aluminum-plastic film is coated on the surface of the naked battery cell and used for packaging the naked battery cell; and the plastic-aluminum membrane is as soft packet of lithium ion battery's shell material for soft packet of lithium ion battery is lighter-weighted more, alleviates soft packet of lithium ion battery's weight, melts the inside polypropylene layer of plastic-aluminum membrane through the heating simultaneously and realizes the sealed of naked electric core, as shown in fig. 1 and 2, naked electric core top is equipped with the top seal district 3 that is used for the naked electric core of encapsulation, and is concrete, in this embodiment one, as shown in fig. 3, top seal district 3 uses "convex" head 6 to encapsulate naked electric core to form the top seal district 3 of the naked electric core of encapsulation.
The bare cell is also provided with an anode tab 1 and a cathode tab 2, and the top sealing area 3 comprises an L-shaped sealing area 31 positioned on two sides of the anode tab 1 and the cathode tab 2, an inner unsealed area 32 positioned below the L-shaped sealing area 31 and an outer unsealed glue area 33 covering the upper part of the L-shaped sealing area 31; and the aluminum plastic films on the non-sealing glue-overflowing areas 33 on the two sides of the positive electrode tab 1 and the negative electrode tab 2 are completely cut off.
Furthermore, by adopting the structure, the space occupied by the soft package lithium ion battery can be reduced, the volume energy density is improved, and the production efficiency is higher; meanwhile, a channel or a space left after the non-sealed glue overflow area 33 is cut off can be used as an air-cooled heat dissipation flow channel of the soft package lithium ion battery, the air-cooled heat dissipation effect of the soft package lithium ion battery is improved, a power wire harness can be arranged in the channel or the space, and the space utilization rate of the soft package lithium ion battery is improved.
Further, in the first embodiment, as shown in fig. 4, the outer non-sealing glue area 33 is formed by cutting off the aluminum-plastic film on both sides of the positive electrode tab 1 and the negative electrode tab 2 by using the "L-shaped" cutter 7.
As shown in fig. 2, a positive tab glue 11 is arranged between the positive tab 1 and the aluminum-plastic film, and the distance between the positive tab glue 11 and the L-shaped sealing area 31 is between 0mm and 3 mm; similarly, a negative pole tab glue 21 is arranged between the negative pole tab 2 and the aluminum plastic film, and the distance between the negative pole tab glue 21 and the L-shaped sealing area 31 is also 0 mm-3 mm; so as to ensure the packaging effect and ensure that the normal functions of the positive pole lug 1 and the negative pole lug 2 are not influenced by the packaging.
Specifically, the width of the inner unsealed area 32 is between 0mm and 3 mm; therefore, the packaging effect can be ensured, the space occupied by the soft package lithium ion battery can be reduced as much as possible, and the normal function of a naked battery cell is not influenced.
Further, the width of the "L-shaped" sealing area 31 can ensure the packaging reliability of the bare cell between 3mm and 8mm, the packaging strength can be ensured, and the volume energy density of the soft package lithium ion battery can be effectively improved.
As shown in fig. 1 to 4, in the present embodiment, the positive electrode tab 1 and the negative electrode tab 2 are opposite-side tabs, and specifically, the positive electrode tab 1 is located above the negative electrode tab 2; further, in other embodiments, the positive electrode tab 1 and the negative electrode tab 2 are tabs on the same side, and specifically, the positive electrode tab 1 is located on one side of the negative electrode tab 2.
As shown in fig. 3, the convex seal head 6 is provided with a fillet, the radius of the fillet is between 1mm and 8mm, and the intersection position of the L-shaped cutter 7 is also provided with a fillet, the radius of which is between 1mm and 8 mm; therefore, the risk of tearing the aluminum plastic films on the two sides of the positive electrode lug 1 and the negative electrode lug 2 can be reduced.
Example two
Referring to fig. 1 to 4, an embodiment of the present invention provides a method for manufacturing a soft package lithium ion battery capable of increasing a volumetric energy density according to the first embodiment, including the following steps:
step S1: manufacturing a bare cell by using a positive pole piece, a negative pole piece and a diaphragm, and manufacturing an aluminum-plastic film shell for accommodating the bare cell;
step S2: packaging the two sides of the positive electrode tab 1 and the negative electrode tab 2 and the aluminum plastic film on the top of the naked battery cell by using a convex seal head 6 to form an L-shaped seal area 31;
step S3: and (3) cutting off the aluminum plastic films on the non-sealing glue overflowing areas 33 on the two sides of the positive electrode lug 1 and the negative electrode lug 2 by using an L-shaped cutter 7.
The naked electric core is encapsulated by adopting a convex end socket 6, and the encapsulation process can be completed by one-time encapsulation; the top seal district 3 of naked electric core is formed, so, can improve the encapsulation efficiency of naked electric core, practices thrift production time.
EXAMPLE III
Referring to fig. 1 to 4, a third embodiment of the present invention provides a specific implementation of a soft package lithium ion battery capable of increasing a volume energy density according to the first manufacturing embodiment.
The method comprises the following steps of manufacturing a naked electric core by using a positive pole piece, a negative pole piece and a diaphragm, and manufacturing an aluminum-plastic film shell for accommodating the naked electric core.
As shown in fig. 1 and 2, the two sides of the positive electrode tab 1 and the negative electrode tab 2 and the aluminum-plastic film on the top of the bare cell are encapsulated by using a "convex" end enclosure 6, so as to form an "L-shaped" sealing region 31.
The total width of the top sealing area 3 is 16mm, the width of the L-shaped sealing area 31 is 5mm, and the distance between the positive electrode tab glue 11 and the L-shaped sealing area 31 is 1 mm; the distance between the negative pole tab glue 21 and the L-shaped sealing area 31 is 1 mm.
As shown in fig. 3, the convex seal head 6 is provided with a fillet with a radius of 2mm, and the intersection position of the L-shaped cutter 7 is also provided with a fillet with a radius of 2 mm.
As shown in fig. 1, after the aluminum plastic films on the non-sealing glue-overflowing areas 33 on the two sides of the positive electrode tab 1 and the negative electrode tab 2 are cut off by using the "L-shaped" cutter 7, the width of the "L-shaped" sealing area 31 is 4mm, and finally the semi-finished soft package lithium ion battery shown in fig. 1 is obtained.
Example four
Referring to fig. 5 to 7, a soft-package lithium ion battery capable of increasing a volumetric energy density is provided in the fourth embodiment of the present invention.
The fourth embodiment is basically the same as the first embodiment, except that the adopted packaging device is different; specifically, in the fourth embodiment, as shown in fig. 6, the top sealing area 3 uses an "L-shaped" end enclosure 5 to encapsulate the bare cell, and the top sealing area 3 encapsulating the bare cell is formed.
Further, in the fourth embodiment, as shown in fig. 7, the outer non-sealing glue-overflowing area 33 is an aluminum-plastic film which is cut off at two sides of the positive electrode tab 1 and the negative electrode tab 2 by using an "L-shaped" cutter 7.
As shown in fig. 6, the L-shaped seal head 5 is provided with a fillet with a radius of 1mm to 8mm, and the intersection position of the L-shaped cutter 7 is also provided with a fillet with a radius of 1mm to 8 mm; therefore, the risk of tearing the aluminum plastic films on the two sides of the positive electrode lug 1 and the negative electrode lug 2 can be reduced.
EXAMPLE five
Referring to fig. 5 to 7, a fifth embodiment of the present invention provides a method for manufacturing a soft package lithium ion battery capable of increasing a volumetric energy density according to a fourth embodiment, including the following steps:
step S1: manufacturing a bare cell by using a positive pole piece, a negative pole piece and a diaphragm, and manufacturing an aluminum-plastic film shell for accommodating the bare cell;
step S2: carrying out top edge sealing on the naked electric core by using a conventional sealing head; forming a first strip seal area 41, as shown in fig. 5;
step S3: carrying out secondary packaging on two sides of the positive electrode tab 1 and the negative electrode tab 2 and the aluminum plastic film on the top of the naked battery cell by using an L-shaped seal head 5 to form an L-shaped seal area 31;
step S4: and (3) cutting off the aluminum plastic films on the non-sealing glue overflowing areas 33 on the two sides of the positive electrode lug 1 and the negative electrode lug 2 by using an L-shaped cutter 7.
The naked electric core is packaged by an L-shaped end enclosure 5, and the packaging process can be completed only by packaging twice; the top seal area 3 of naked electric core is formed, so, encapsulation efficiency just is less than the encapsulation efficiency of embodiment two, but also can reduce the space that soft packet of lithium ion battery occupied, has improved volume energy density.
EXAMPLE six
Referring to fig. 1 and fig. 5 to 7, a sixth embodiment of the present invention provides a specific implementation of the soft-package lithium ion battery capable of increasing the volumetric energy density according to the first embodiment of the present invention.
The method comprises the following steps of manufacturing a naked electric core by using a positive pole piece, a negative pole piece and a diaphragm, and manufacturing an aluminum-plastic film shell for accommodating the naked electric core.
As shown in fig. 5, a conventional sealing head is used to perform top edge sealing on the bare cell; forming a first strip seal area 41.
After the first packaging, the width of the first strip-shaped sealing area 41 is 5mm, the total width of the top sealing area 3 is 16mm, and the outer non-sealing glue overflowing area 33 is 1 mm.
As shown in fig. 6, the two sides of the positive electrode tab 1 and the negative electrode tab 2 and the aluminum-plastic film on the top of the bare cell are secondarily encapsulated by using an "L-shaped" end enclosure 5 to form an "L-shaped" sealing region 31.
The width of the L-shaped sealing area 31 is 5mm, the width of the inner unsealed area 32 is 2mm, and the distance between the positive electrode tab glue 11 and the L-shaped sealing area 31 is 1 mm; the distance between the negative pole tab glue 21 and the L-shaped sealing area 31 is 1 mm.
As shown in fig. 6 and 7, the "L-shaped" end socket 5 is provided with a fillet with a radius of 2mm, and the intersection position of the "L-shaped" cutter 7 is also provided with a fillet with a radius of 2 mm.
As shown in fig. 1, after the aluminum plastic films on the non-sealing glue-overflowing areas 33 on the two sides of the positive electrode tab 1 and the negative electrode tab 2 are cut off by using the "L-shaped" cutter 7, the width of the "L-shaped" sealing area 31 is 4mm, and finally the semi-finished soft package lithium ion battery shown in fig. 1 is obtained.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A soft package lithium ion battery capable of improving volume energy density is characterized by comprising a naked battery cell consisting of a positive pole piece, a negative pole piece and a diaphragm, wherein the surface of the naked battery cell is coated with an aluminum plastic film, and the aluminum plastic film is used for packaging the naked battery cell; a top sealing area (3) used for packaging the bare cell is arranged above the bare cell, the bare cell is also provided with an anode tab (1) and a cathode tab (2), and the top sealing area (3) comprises an L-shaped sealing area (31) positioned on two sides of the anode tab (1) and the cathode tab (2), an inner unsealed area (32) positioned below the L-shaped sealing area (31) and an outer unsealed glue area (33) covering the L-shaped sealing area (31); and the aluminum plastic films on the non-sealing glue overflowing areas (33) on the two sides of the anode tab (1) and the cathode tab (2) are completely cut off.
2. The soft package lithium ion battery capable of improving the volumetric energy density according to claim 1, wherein the top sealing area (3) is formed by packaging a bare cell by using an L-shaped sealing head (5); or a convex end socket (6) is used for packaging the naked electric core.
3. The soft package lithium ion battery capable of improving the volume energy density according to claim 2, wherein the outer non-sealing glue overflow area (33) is an aluminum plastic film which is cut off at two sides of the positive electrode tab (1) and the negative electrode tab (2) by using an L-shaped cutter (7).
4. The soft package lithium ion battery capable of improving the volume energy density according to claim 1, wherein a positive electrode tab glue (11) is arranged between the positive electrode tab (1) and the aluminum plastic film, and the distance between the positive electrode tab glue (11) and the L-shaped sealing area (31) is between 0mm and 3 mm;
and a negative pole tab glue (21) is arranged between the negative pole tab (2) and the aluminum-plastic film, and the distance between the negative pole tab glue (21) and the L-shaped sealing area (31) is also 0-3 mm.
5. The lithium ion battery pack with the improved volumetric energy density according to claim 1, wherein the width of the inner unsealed area (32) is between 0mm and 3 mm; the width of the L-shaped sealing area (31) is between 3mm and 8 mm.
6. The soft package lithium ion battery capable of improving the volume energy density according to claim 1, wherein the positive electrode tab (1) and the negative electrode tab (2) are same-side tabs or different-side tabs.
7. The soft package lithium ion battery capable of improving the volume energy density according to claim 2, wherein the L-shaped end socket (5) and the convex end socket (6) are both provided with a rounded corner, and the radius of the rounded corner is between 1mm and 8 mm.
8. The soft package lithium ion battery capable of improving the volume energy density according to claim 3, wherein the intersection position of the L-shaped cutting knife (7) is provided with a rounded corner, and the radius of the rounded corner is between 1mm and 8 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121745220.9U CN215834603U (en) | 2021-07-29 | 2021-07-29 | Soft package lithium ion battery capable of improving volume energy density |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121745220.9U CN215834603U (en) | 2021-07-29 | 2021-07-29 | Soft package lithium ion battery capable of improving volume energy density |
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| CN215834603U true CN215834603U (en) | 2022-02-15 |
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| CN202121745220.9U Active CN215834603U (en) | 2021-07-29 | 2021-07-29 | Soft package lithium ion battery capable of improving volume energy density |
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- 2021-07-29 CN CN202121745220.9U patent/CN215834603U/en active Active
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