CN214384771U - Packaging structure of battery and soft package lithium ion battery comprising same - Google Patents
Packaging structure of battery and soft package lithium ion battery comprising same Download PDFInfo
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- CN214384771U CN214384771U CN202023311310.5U CN202023311310U CN214384771U CN 214384771 U CN214384771 U CN 214384771U CN 202023311310 U CN202023311310 U CN 202023311310U CN 214384771 U CN214384771 U CN 214384771U
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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
Abstract
The utility model provides a battery packaging structure and soft package lithium ion battery containing the same, wherein the packaging structure comprises a first polymer layer and a metal layer which are sequentially wrapped outside a battery cell, and a second polymer layer which is optionally wrapped outside the metal layer; the thickness of the second polymer layer is less than or equal to 15 mu m, the energy density of the battery can be obviously improved, and the soft package lithium ion battery with the structure is simple in preparation process and wide in application range.
Description
Technical Field
The utility model relates to a battery structure technical field especially relates to an encapsulation structure of battery and contain its soft packet of lithium ion battery.
Background
The soft package lithium ion battery has the characteristics of high specific energy, good safety, flexible design and the like, and is widely applied to the fields of consumer electronics and electric automobiles. Soft package lithium ion batteries generally comprise a battery core assembled by positive and negative pole pieces and diaphragms, positive and negative pole tabs led out from the pole piece ends, and an aluminum plastic film coated outside the battery core. Due to the unique structure of the soft package lithium ion battery, the soft package lithium ion battery has the excellent characteristics of high safety performance, low weight, high energy density and the like.
The aluminum-plastic film generally comprises an outer nylon layer, a PET layer, an intermediate aluminum layer and an inner PP layer, and has extremely high barrier property, good stamping formability, puncture resistance, electrolyte resistance stability and excellent electrical insulation property.
At present, compared with a hard shell lithium ion battery, a soft package lithium ion battery has certain advantages in energy density, but the demand of the modern society for a high-energy-density lithium ion battery is increasing, and the development of a lithium ion battery with higher energy density is imperative.
CN204118197U discloses a soft package lithium ion battery module, wherein the soft package lithium ion battery layer unit comprises a soft package lithium ion battery, a frame and a heat dissipation plate, the frame is of a rectangular structure and is composed of at least one rectangular cavity, the heat dissipation plate is provided with pits with the same shape and number as the rectangular cavities of the frame, the heat dissipation plate is clamped in the frame, and the pits on the heat dissipation plate are sunk into the rectangular cavities of the frame; the soft package lithium ion battery is arranged in the concave pit of the heat dissipation plate, and a soft package lithium ion battery layer unit is integrally formed; at least two soft package lithium ion battery layer units are overlapped along the thickness direction and fixedly installed between the bottom plate and the upper cover through fastening bolts, so that a soft package lithium ion battery module is formed, and the heat dissipation and the energy density are improved.
CN109037813A discloses a high energy density soft package lithium ion battery formation process, which comprises the following steps: (1) pressurizing and heating the battery cell for the first time; (2) pre-charging the battery cell in the step (1) to a certain SOC; (3) cutting an air bag for the battery cell in the step (2); (4) vacuumizing the battery cell in the step (3) and performing pre-secondary sealing; (5) carrying out secondary pressurization and heating on the battery cell treated in the step (4); (6) and (5) pre-charging the battery cell in the step (5) to full charge. The utility model has the advantages that can effectively generate even, fine and close, stable SEI membrane at the negative pole surface, increase electric core liquid storage volume simultaneously, reduce electric core thickness, but this preparation method is more to original soft packet of lithium ion battery's technology improvement.
CN210092147U discloses soft packet of lithium ion battery banding structure, including a top banding and two side banding that can hold utmost point ear to pass through, two side banding bilateral symmetry set up, two side banding perpendicular to side banding, two the side banding is all bent and is pasted on soft packet of lithium ion battery body through the rubber coating, the rubber coating covers two the edge of side banding.
In summary, the demand for high energy density lithium ion batteries is increasing, and there is a need to develop a lithium ion battery with higher energy density.
SUMMERY OF THE UTILITY MODEL
In view of the problem that exists among the prior art, the utility model provides a packaging structure of battery can effectively improve the energy density of battery, and the energy density of battery promotes more than 2%, and simple structure, and the operation is feasible.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the present invention provides a battery package structure, which includes a first polymer layer and a metal layer sequentially wrapped outside a battery cell, and optionally a second polymer layer wrapped outside the metal layer; the thickness of the second polymer layer is 15 μm or less, and may be, for example, 0 μm, 2 μm, 4 μm, 5 μm, 7 μm, 9 μm, 10 μm, 12 μm, 14 μm or 15 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
The utility model provides a packaging structure of battery is injectd to being less than or equal to 15 mu m through the thickness with second polymer layer, has not only improved the energy density of battery, and is less to preparation technology change moreover, uses conveniently.
Preferably, the packaging structure comprises a first polymer layer and a metal layer which are sequentially wrapped on the outer side of the battery cell, and optionally a second polymer layer wrapped on the outer side of the metal layer; the thickness of the second polymer layer is less than or equal to 15 mu m.
Preferably, the first polymer layer is a polypropylene layer.
Preferably, the thickness of the first polymer layer is 60 to 80 μm, and may be, for example, 60 μm, 63 μm, 65 μm, 67 μm, 69 μm, 72 μm, 74 μm, 76 μm, 78 μm or 80 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the metal layer is an aluminum layer.
The thickness of the metal layer is preferably 35 to 45 μm, and may be, for example, 35 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm, 44 μm or 45 μm, but is not limited to the values listed above, and other values not listed above in this range are also applicable.
Preferably, the second polymer layer comprises a polyethylene terephthalate layer and/or a nylon layer.
Preferably, the thickness of the second polymer layer is 2 to 8 μm, and may be, for example, 2 μm, 2.7 μm, 3.4 μm, 4 μm, 4.7 μm, 5.4 μm, 6 μm, 6.7 μm, 7.4 μm or 8 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
The thickness of the polyethylene terephthalate layer is preferably 1 to 3 μm, and may be, for example, 1 μm, 1.2 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.3 μm, 2.5 μm, or 3.0 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
The thickness of the nylon layer is preferably 1 to 3 μm, and may be, for example, 1 μm, 1.2 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.3 μm, 2.5 μm or 3.0 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
In a second aspect, the utility model provides a soft packet of lithium ion battery, soft packet of lithium ion battery includes the first aspect the packaging structure of battery.
Soft packet of lithium ion battery owing to include the first aspect the packaging structure of battery, higher energy density has.
Preferably, the soft package lithium ion battery further comprises a battery cell, and a negative electrode tab and a positive electrode tab which are arranged at two ends of the battery cell or at the same end.
Preferably, the battery cell is formed by winding or laminating a positive pole piece, a negative pole piece and a diaphragm.
The preparation method of the soft package lithium ion battery comprises the following steps: and partially or completely stripping the second polymer layer on the surface of the packaged soft package lithium ion battery to obtain the soft package lithium ion battery.
Preferably, the thickness of the second polymer layer before peeling is 30 to 40 μm, and may be, for example, 30 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm or 40 μm, but is not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the peeling comprises chemical peeling and/or physical peeling.
Preferably, the physical peeling comprises mechanical peeling or thermal pressure peeling.
Preferably, the chemical stripping comprises corrosion stripping.
The utility model discloses it is right anodal, negative pole and utmost point ear material and electric core structure do not have special restriction, can adopt any anodal, negative pole and utmost point ear material and the electric core structure that can be used to soft packet of lithium ion battery that technical staff is familiar in the field.
The positive electrode material may be, for example, lithium manganate (LiMnO)2) Lithium cobaltate (LiCoO)2) Or lithium nickel cobalt manganese oxide (LixNiMnCoO)2) Any one or a combination of at least two of them.
The anode material may be, for example, any one of graphite, a silicon anode, or mesophase carbon spheres, or a combination of at least two of them.
The separator material may be, for example, a PE film or a PP film.
The tab material may be, for example, a 4.5 μm thick copper foil, a 6 μm thick copper foil, an 8 μm thick copper foil, a 13 μm thick aluminum foil, or a 15 μm aluminum foil.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
(1) the utility model provides a packaging structure of battery can improve the energy density of soft package lithium ion battery through reducing the thickness of second polymer layer;
(2) the utility model provides a soft packet of lithium ion battery energy density is high, and to specific soft packet of lithium ion battery, volume energy density is greater than or equal to 602Wh/L, compares in the soft packet of lithium ion battery who does not get rid of second polymer layer and has promoted more than 2%, can promote more than 3% under the better condition, preparation simple process, application prospect is wide.
Drawings
Fig. 1 is a schematic diagram of a soft package lithium ion battery provided in application example 1 of the present invention and an encapsulation structure provided in embodiment 1.
Fig. 2 is a schematic diagram of a soft package lithium ion battery provided in application example 2 and an encapsulation structure provided in embodiment 3 of the present invention.
In the figure: 1-packaging the structure; 11-a first polymer layer; 12-a metal layer; 13-a second polymer layer; 2-a negative pole tab; 3-positive pole ear; and 4-electric core.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The present invention will be described in further detail below. However, the following examples are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
First, examples and comparative examples
Example 1
The embodiment provides a package structure of a battery, as shown in fig. 1, where the package structure 1 includes a first polymer layer 11 and a metal layer 12 sequentially wrapped on an outer side of a battery core 4; the first polymer layer 11 is a polypropylene layer, and the thickness of the first polymer layer 11 is 78 μm; the metal layer 12 is an aluminum layer; the thickness of the metal layer 12 is 40 μm.
Example 2
In this embodiment, as shown in fig. 2, the package structure 1 includes a first polymer layer 11 and a metal layer 12 sequentially wrapped on the outer side of a battery core 4; and a second polymer layer 13 wrapped outside the metal layer 12; the first polymer layer 11 is a polypropylene layer, and the thickness of the first polymer layer 11 is 60 μm; the metal layer 12 is an aluminum layer; the thickness of the metal layer 12 is 35 μm; the second polymer layer 13 comprises a polyethylene terephthalate layer and a nylon layer in sequence; the thickness of the polyethylene terephthalate layer is 5 mu m; the thickness of the nylon layer is 10 μm.
Example 3
The embodiment provides a packaging structure of a battery, which includes a first polymer layer and a metal layer sequentially wrapped outside a battery core; and a second polymer layer wrapped outside the metal layer; the first polymer layer is a polypropylene layer, and the thickness of the first polymer layer is 80 μm; the metal layer is an aluminum layer; the thickness of the metal layer is 45 μm; the second polymer layer sequentially comprises a nylon layer and a polyethylene terephthalate layer; the thickness of the polyethylene terephthalate layer is 2 mu m; the thickness of the nylon layer is 5 μm.
Example 4
The present embodiment provides a package structure of a battery, which further includes a second polymer layer wrapped on the outer side of the metal layer; the second polymer layer was a 5 μm nylon layer, and the rest was the same as in example 1.
Example 5
The present embodiment provides a package structure of a battery, which further includes a second polymer layer wrapped on the outer side of the metal layer; the second polymer layer was a 10 μm nylon layer, and the rest was the same as in example 1.
Example 6
The present embodiment provides a package structure of a battery, which further includes a second polymer layer wrapped on the outer side of the metal layer; the second polymer layer was a 1 μm nylon layer, and the rest was the same as in example 1.
Comparative example 1
The present comparative example provides a package structure of a battery, the package structure further including a second polymer layer wrapped outside the metal layer; the second polymer layer was a 35 μm nylon layer, the remainder being the same as in example 1.
Comparative example 2
The present comparative example provides a package structure of a battery, the package structure further including a second polymer layer wrapped outside the metal layer; the second polymer layer was a 35 μm polyethylene terephthalate layer, and the rest was the same as in example 1.
Comparative example 3
The present comparative example provides a package structure of a battery, the package structure further including a second polymer layer wrapped outside the metal layer; the second polymer layer sequentially comprises a nylon layer and a polyethylene terephthalate layer; the thickness of the polyethylene terephthalate layer is 20 μm; the nylon layer was the same as in example 1 except that the thickness was 15 μm.
Comparative example 4
The present comparative example provides a package structure of a battery, the package structure further including a second polymer layer wrapped outside the metal layer; the second polymer layer sequentially comprises a polyethylene terephthalate layer and a nylon layer; the thickness of the polyethylene terephthalate layer is 30 μm; the nylon layer was the same as in example 1 except that the thickness was 10 μm.
Second, application example and application comparative example
Application example 1
The application example provides a soft package lithium ion battery, as shown in fig. 1, where the soft package lithium ion battery includes a package structure 1 of a battery described in embodiment 1; the soft package lithium ion battery also comprises a battery cell 4, and a negative electrode tab 2 and a positive electrode tab 3 which are arranged at two ends of the battery cell 4; the battery cell 4 is formed by winding or laminating a positive pole piece, a negative pole piece and a diaphragm.
The application example also provides a preparation method of the soft package lithium ion battery, which comprises the following steps: completely stripping the second polymer layer on the surface of the packaged soft package lithium ion battery by adopting a hot pressing stripping method, wherein the hot pressing temperature is 180 ℃, the pressure is 0.5MPa, and the hot pressing duration is 30s, so as to obtain the soft package lithium ion battery; the thickness of the second polymer layer before the peeling was 35 μm.
Application example 2
The present application example provides a soft package lithium ion battery, as shown in fig. 2, where the soft package lithium ion battery includes a package structure 1 of a battery described in embodiment 2; the soft package lithium ion battery also comprises a battery cell 4, and a negative electrode tab 2 and a positive electrode tab 3 which are arranged at two ends of the battery cell 4; the battery cell 4 is formed by winding or laminating a positive pole piece, a negative pole piece and a diaphragm.
The application example also provides a preparation method of the soft package lithium ion battery, which comprises the following steps: scraping the nylon layer part of the second polymer layer on the surface of the packaged soft package lithium ion battery by adopting a scraper stripping method, and only retaining the polyethylene terephthalate layer to obtain the soft package lithium ion battery; before the peeling, the thickness of the polyethylene terephthalate layer is 5 μm; the thickness of the nylon layer is 25 μm.
Application example 3
The application example provides a soft package lithium ion battery, which comprises the packaging structure of the battery in the embodiment 3; the soft package lithium ion battery also comprises a battery cell, and a negative electrode lug and a positive electrode lug which are arranged at two ends of the battery cell; the battery cell is formed by winding or laminating a positive pole piece, a negative pole piece and a diaphragm.
The application example also provides a preparation method of the soft package lithium ion battery, which comprises the following steps: scraping the nylon layer part of the second polymer layer on the surface of the packaged soft package lithium ion battery by adopting a scraper stripping method, and only retaining the polyethylene terephthalate layer to obtain the soft package lithium ion battery; before the peeling, the thickness of the polyethylene terephthalate layer is 5 μm; the thickness of the nylon layer is 25 μm.
Application examples 4 to 6
Application examples 4 to 6 respectively provide a soft package lithium ion battery, and the rest of the soft package lithium ion battery is the same as the application example 1 except that the soft package lithium ion battery respectively comprises the battery packaging structures of the embodiments 4 to 6.
Application example 7
The application example provides a soft package lithium ion battery, which comprises the packaging structure of the battery in the embodiment 1; the soft package lithium ion battery also comprises a battery cell, and a negative electrode lug and a positive electrode lug which are arranged at two ends of the battery cell; the battery cell is formed by winding or laminating a positive pole piece, a negative pole piece and a diaphragm.
The application example also provides a preparation method of the soft package lithium ion battery, which comprises the following steps: completely stripping the second polymer layer on the surface of the packaged soft package lithium ion battery by adopting a chemical corrosion stripping method, wherein the chemical corrosion agent is hydrofluoric acid, the corrosion time is 10min, and the temperature is 90 ℃, so as to obtain the soft package lithium ion battery; the thickness of the second polymer layer before the peeling was 35 μm.
Application comparative examples 1 to 4
The application comparative examples 1 to 4 respectively provide a soft package lithium ion battery, and the soft package lithium ion battery is the same as the application example 1 except that the soft package lithium ion battery respectively comprises the packaging structures of the batteries of the comparative examples 1 to 4 and is not stripped.
Third, test and results
In order to compare the energy density of the soft package lithium ion battery conveniently, the negative electrode material of the soft package lithium ion battery cell is made of graphite, the positive electrode material is nickel cobalt lithium manganate, the electrolyte is mainly ethyl carbonate, the diaphragm is a PP (polypropylene) film, the tab materials are made of aluminum foil materials, and the thicknesses of the tab materials are respectively 13 micrometers. The energy density testing method adopts a charge-discharge tester, fully charges and then fully discharges according to 0.33C, records discharge energy E, then weighs cell volume V, and calculates volume energy density when E/V is volume energy density. The energy densities of the above application examples and comparative application examples are shown in table 1.
TABLE 1
| Energy Density (Wh/L) | |
| Application example 1 | 607.7 |
| Application example 2 | 602.0 |
| Application example 3 | 605.1 |
| Application example 4 | 606.2 |
| Application example 5 | 603.5 |
| Application example 6 | 607.1 |
| Application comparative example 1 | 588.3 |
| Comparative application example 2 | 589.2 |
| Comparative application example 3 | 589.5 |
| Application comparative example 4 | 586.9 |
From table 1, the following points can be seen:
(1) it can be seen from comprehensive application examples 1-6 that the utility model provides a packaging structure of battery can improve the energy density of battery, and its volume energy density has promoted more than 2% compared in not getting rid of the soft packet of lithium ion battery on second polymer layer, can promote more than 3% under the preferred condition, to above-mentioned specific soft packet of lithium ion battery, volume energy density is more than or equal to 602 Wh/L;
(2) as can be seen from the combination of application example 1 and application comparative examples 1 to 4, the second polymer layer was not provided in application example 1, the energy density of the soft-packed lithium ion battery in application example 1 was 607.7Wh/L compared to the total thickness of the second polymer layer in application comparative examples 1 to 4 was 35 μm, 35 μm and 40 μm, respectively, and the volumetric energy densities of application comparative examples 1 to 4 were 588.3Wh/L, 589.2Wh/L, 589.5Wh/L and 586.9Wh/L, respectively, i.e., the volumetric energy densities of application example 1 and comparative examples 1 to 4 were increased by 3.30%, 3.14%, 3.09% and 3.54%, respectively, thereby showing that the present invention increases the volumetric energy density of the battery by limiting the thickness of the second polymer layer to 15 μm or less;
(3) it can be seen from the comprehensive application examples 1 and 4-6 that the second polymer layer is not disposed in application example 1, and compared with the application examples 4-6 in which a part of the second polymer layer is still remained, the energy density of the soft package lithium ion battery in application example 1 is 607.7Wh/L, and the volumetric energy densities of the application comparative examples 4-6 are 606.2Wh/L, 603.5Wh/L and 607.1Wh/L, respectively, but the thickness of the second polymer layer in application example 4 is 5 μm, and the energy density is still high, and the problem of preventing scratches during the transportation process of the soft package lithium ion battery can be solved.
To sum up, the utility model provides a packaging structure of battery can show the energy density who improves the battery, and energy density can promote more than 2%, can promote more than 3% under better condition, and contains the soft packet of lithium ion battery preparation simple process of this structure, and application range is wide.
The applicant states that the present invention is described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. the present invention can be implemented only by relying on the above detailed structural features. It should be clear to those skilled in the art that any modifications to the present invention, to the equivalent replacement of selected parts and the addition of auxiliary parts, the selection of specific modes, etc., all fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. The packaging structure of the battery is characterized by comprising a first polymer layer, a metal layer and a second polymer layer, wherein the first polymer layer and the metal layer are sequentially wrapped on the outer side of a battery core, and the second polymer layer is optionally wrapped on the outer side of the metal layer;
the thickness of the second polymer layer is less than or equal to 15 mu m.
2. The battery packaging structure of claim 1, wherein the first polymer layer has a thickness of 60 to 80 μm.
3. The battery packaging structure according to claim 1 or 2, wherein the metal layer has a thickness of 35 to 45 μm.
4. The battery packaging structure of claim 1 or 2, wherein the second polymer layer comprises a polyethylene terephthalate layer and/or a nylon layer.
5. The battery packaging structure according to claim 1 or 2, wherein the thickness of the second polymer layer is 2-8 μm.
6. The battery packaging structure of claim 4, wherein the thickness of the polyethylene terephthalate layer is 1-3 μm.
7. The battery packaging structure of claim 4, wherein the nylon layer has a thickness of 1-3 μm.
8. A soft package lithium ion battery is characterized by comprising the packaging structure of the battery according to any one of claims 1-7.
9. The soft package lithium ion battery of claim 8, further comprising a battery cell, and a negative electrode tab and a positive electrode tab disposed at two ends or the same end of the battery cell.
10. The soft-package lithium ion battery according to claim 8 or 9, wherein the battery cell is formed by winding or laminating a positive electrode plate, a negative electrode plate and a diaphragm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112635876A (en) * | 2020-12-31 | 2021-04-09 | 远景动力技术(江苏)有限公司 | Battery packaging structure, soft package lithium ion battery comprising battery packaging structure and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112635876A (en) * | 2020-12-31 | 2021-04-09 | 远景动力技术(江苏)有限公司 | Battery packaging structure, soft package lithium ion battery comprising battery packaging structure and preparation method |
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