CN111934025A - Battery pole group for improving winding stress and battery using same - Google Patents
Battery pole group for improving winding stress and battery using same Download PDFInfo
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- CN111934025A CN111934025A CN202010612024.8A CN202010612024A CN111934025A CN 111934025 A CN111934025 A CN 111934025A CN 202010612024 A CN202010612024 A CN 202010612024A CN 111934025 A CN111934025 A CN 111934025A
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- battery
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- negative plate
- pole group
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- 238000004804 winding Methods 0.000 title claims abstract description 26
- 239000002033 PVDF binder Substances 0.000 claims abstract description 36
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 23
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 230000008093 supporting effect Effects 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 14
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000007731 hot pressing Methods 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000013329 compounding Methods 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000007600 charging Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000010280 constant potential charging Methods 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000005059 dormancy Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002224 dissection Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery pole group for improving winding stress, which comprises a positive plate, a negative plate and a diaphragm; the battery pole group is prepared from a positive plate, a negative plate and a diaphragm in a winding mode; the diaphragm is positioned between the positive plate and the negative plate; the diaphragm includes a diaphragm base; the upper and lower surfaces of the diaphragm substrate are coated with a PVDF binder, or a mixture of a ceramic material and a PVDF binder. In addition, the invention also discloses a winding type lithium ion secondary battery. The invention bonds the positive plate, the negative plate and the diaphragm by a dry-pressing thermal composite technology. Because the PVDF coated on the diaphragm can provide a skeleton supporting effect, a space is reserved for the expansion of the negative plate in the charging and discharging process, the stress problem of the wound battery can be obviously reduced, the expansion stress problem of the negative plate at the corner of the wound battery is reduced, and the cycle performance and the safety performance of the battery are improved.
Description
Technical Field
The invention relates to the technical field of lithium ion secondary batteries, in particular to a battery pole group for improving winding stress and a battery using the same.
Background
With the development of technology, the energy density of batteries is increasingly required. The existing battery structure mainly comprises two processes of winding and laminating, wherein the winding process becomes a main design scheme of the battery due to simple and convenient manufacturing process.
At present, in the direction of high energy density, the content of active materials in the battery is gradually increased, the thickness of a pole group is increased, and the expansion force of the battery is obviously increased. Particularly, at the corners of the wound battery, the stress generated by the expansion of the negative pole piece is larger, so that the electrolyte is deficient, the pole piece has dead zones and lithium precipitation phenomena, the performance of the battery is reduced, and a safety problem is caused in severe cases.
Disclosure of Invention
The invention aims to provide a battery pole group capable of improving winding stress and a battery using the same, aiming at the technical defects in the prior art.
Therefore, the invention provides a battery pole group for improving winding stress, which comprises a positive pole piece, a negative pole piece and a diaphragm;
the battery pole group is prepared from a positive plate, a negative plate and a diaphragm in a winding mode;
the diaphragm is positioned between the positive plate and the negative plate;
the diaphragm includes a diaphragm base;
the upper surface and the lower surface of the diaphragm substrate are both coated with PVDF adhesive or a mixture containing ceramic materials and PVDF adhesive;
wherein, the PVDF adhesive is used for providing a skeleton supporting function;
for a mixture comprising a ceramic material and a PVDF binder, the PVDF is present in the mixture in a proportion of 10% to 30% by weight and the ceramic is present in a proportion of 70% to 90% by weight.
The diaphragm substrate is made of Polyethylene (PE), polypropylene (PP) or a mixture of Polyethylene (PE) and polypropylene (PP).
Wherein the ceramic material is specifically Al2O3MgO-based inorganic metal oxide.
Wherein, the coating mode of the PVDF adhesive on the diaphragm substrate is a spot coating mode.
Wherein the double-sided gluing amount of the diaphragm is 0.2-2.5 g/square meter.
Wherein, a dry-pressing thermal compounding technology is adopted to bond the positive plate, the negative plate and the diaphragm;
wherein, the hot pressing temperature is 50-130 ℃, the hot pressing pressure is 0.2-7.0 MPa, and the hot pressing time is 3-90 s.
In addition, the invention also provides a winding type lithium ion secondary battery which comprises the battery pole group.
Compared with the prior art, the battery pole group with improved winding stress and the battery using the same have the advantages that the positive pole piece, the negative pole piece and the diaphragm are bonded through the dry-pressing thermal compounding technology. The PVDF coated on the diaphragm can provide a skeleton supporting effect, so that a space is reserved for the expansion of the negative plate in the charging and discharging processes, the stress problem of the wound battery can be obviously reduced, particularly the expansion stress problem of the negative plate at the corner of the wound battery is reduced, the cycle performance and the safety performance of the battery are improved, and the method has great practical significance.
Drawings
Fig. 1a is a schematic view of a separator in a battery electrode assembly for improving winding stress, which is provided by the invention, when the coating amount is low;
FIG. 1b is a schematic view of a separator in a battery electrode assembly with improved winding stress according to the present invention, wherein the separator has a high glue coating amount;
fig. 2 is a schematic view of a battery pole set for improving winding stress according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1a, 1b and 2, the present invention provides a battery electrode assembly for improving winding stress, including a positive electrode tab, a negative electrode tab and a separator;
the battery pole group is prepared from a positive plate, a negative plate and a diaphragm in a winding mode;
the diaphragm is positioned between the positive plate and the negative plate;
the diaphragm includes a diaphragm base;
the upper surface and the lower surface of the diaphragm substrate are coated with PVDF (polyvinylidene fluoride) adhesive or a mixture containing ceramic materials and PVDF adhesive;
wherein, PVDF adhesive is used for providing skeleton supporting function.
In a particular implementation of the invention, the mixture comprising the ceramic material and the PVDF binder comprises 10% to 30% by weight of PVDF and 70% to 90% by weight of ceramic.
In the present invention, in a specific implementation, the material of the diaphragm substrate is polyethylene PE, polypropylene PP, or a mixture of polyethylene PE and polypropylene PP (i.e., a composite diaphragm material).
In the present invention, the ceramic material may be Al2O3MgO-based inorganic metal oxide.
In the present invention, the binder on the separator substrate is PVDF based material.
It should be noted that, for the present invention, the separator used may be coated with only PVDF binder or may be coated with a mixture comprising a ceramic material and PVDF.
In the invention, in a specific implementation, the coating mode of the PVDF (polyvinylidene fluoride) binder on the diaphragm substrate is a dot coating mode, and the PVDF glue particles can be in flat contact or in superposed contact. Therefore, the invention can ensure the caking property of the pole group and the transmission of lithium ions, and compared with the original surface gluing mode, the invention has lower internal resistance and better performance for the corresponding battery.
Referring to fig. 1a and 1b, PVDF (polyvinylidene fluoride) particles 2 are spot-coated on a membrane substrate 1, and fig. 1a and 1b are schematic views of a membrane with low coating weight and high coating weight, respectively.
In the invention, the double-sided gluing amount (namely the coating density of the PVDF adhesive) of the diaphragm is 0.2-2.5 g/per square meter. The PVDF skeleton structure can form enough space between the positive plate and the negative plate to accommodate the expansion of the negative plate, thereby reducing the expansion stress of the negative plate and relieving the problem of cycle performance attenuation caused by the winding stress.
In the invention, after the positive plate, the negative plate and the diaphragm are wound into a pole group, the positive plate, the negative plate and the diaphragm are bonded by adopting the existing dry-pressing thermal compounding technology;
wherein, in order to ensure the better shaping degree of the pole group, the hot pressing temperature of 50-130 ℃ is required, the hot pressing pressure is 0.2-7.0 MPa, and the hot pressing time is 3-90 s.
Referring to fig. 2, PVDF (polyvinylidene fluoride) binder coatings 11, which are disposed on both upper and lower sides of separator 12 and between positive electrode sheet 13 and negative electrode sheet 14, can provide a skeleton supporting function.
It should be noted that, for the present invention, the positive plate and the negative plate are common and general positive plates and negative plates, and the positive plate and the negative plate are not the improvement technical points of the present patent.
It should be noted that, for the invention, in order to improve the problem of the winding stress of the wound battery, the invention adopts the diaphragm coated with the ceramic material and the PVDF binder, and the dry-pressing thermal compounding technology, so that the positive and negative electrode plates can keep good cohesiveness, and a space can be provided for the expansion of the negative electrode plate in the charging and discharging processes, thereby improving the battery performance.
Compared with the prior art, the invention forms the pole group by combining the current collectors (the positive current collector and the negative current collector), the active material and the diaphragm. By adopting the high-temperature and high-pressure thermal compounding technology, on one hand, the flatness of the pole group after hot pressing is good, the cohesiveness of the positive and negative pole pieces is strong, the deformation of the pole group caused by the expansion of the negative pole pieces after formation can be effectively relieved, and the winding stress of the battery is reduced. On the other hand, because the diaphragm is coated with the PVDF material, the strong framework support property is realized, and a gap is reserved between the positive plate and the negative plate, so that the expansion of the negative plate in the charging and discharging process is improved, the liquid retention capacity of the electrolyte is improved, and particularly the expansion stress at the corners of the wound battery is greatly improved, thereby further improving the cycle and safety performance of the battery.
Based on the battery pole group with improved winding stress provided by the invention, the invention also provides a winding type lithium ion secondary battery, which comprises the battery pole group.
In the specific implementation of the invention, the battery pole group adopts a diaphragm coated with a ceramic material and a PVDF adhesive on one side and a PVDF adhesive on the other side, and a current collector, an active material and the diaphragm are combined into a pole group. By adjusting the material quality, the glue coating amount and the glue coating mode of the base film, the invention can form various implementation cases.
In the concrete implementation, the positive and negative pole pieces are enabled to ensure good cohesiveness through the diaphragm by carrying out hot pressing on the pole group at a certain temperature, pressure and time, so that the pole group is ensured to keep good shaping degree. The invention can form various embodiments by adjusting the process parameters such as temperature, pressure, time and the like.
In order to more clearly understand the technical solution of the present invention, the following description is given with reference to specific embodiments to illustrate the working principle of the present invention.
Examples are given.
First, for the present invention, a positive electrode sheet (NCM 811 system), a negative electrode sheet, and a separator coated with a PVDF (polyvinylidene fluoride) binder were wound to prepare a battery electrode assembly. And the pole group is bonded by adopting a dry pressing and hot compounding technology.
And then, assembling, injecting, forming, sorting and other processes are carried out on the battery pole group after hot pressing to prepare the lithium ion battery.
Then, selecting a battery to perform a cycle test, wherein the cycle mode is that 1C constant current charging is carried out until 4.2V, and 4.2V constant voltage charging is carried out until 0.05C; dormancy for 30 minutes; then the 1C was discharged to 2.8V with constant current. After 2000 cycles, the capacity retention rate was observed, and the condition of the pole piece of the battery was observed by dissection, as shown in table 1 below.
Comparative example.
First, a positive electrode sheet (NCM 811 system), a negative electrode sheet, and a general separator were wound to prepare a battery electrode assembly. And carrying out common hot pressing on the battery pole group.
And then, carrying out processes of assembling, injecting, forming, sorting and the like on the hot-pressed pole group to prepare the lithium ion battery.
Then, selecting a battery to perform a cycle test, wherein the cycle mode is that 1C constant current charging is carried out until 4.2V, and 4.2V constant voltage charging is carried out until 0.05C; dormancy for 30 minutes; then the 1C was discharged to 2.8V with constant current. After 1500 cycles, the capacity retention rate is observed, and the condition of the battery pole piece is observed in a dissecting way, and the condition is shown in the following table 1.
Table 1: the cycle capacity retention ratio and the surface condition of the negative electrode of the batteries of examples and comparative examples are shown.
| Item | Retention rate of circulating capacity | Negative electrode surface state after cycle |
| Comparative example | 1200 times @ 80% | A large amount of dead zones and lithium precipitation on the surface |
| Examples | 2000 times @ 80% | No dead zone on the surface and no lithium precipitation |
As can be seen from table 1 above, by applying the technical scheme of the present invention, the cycle performance of the battery is significantly improved, and after multiple cycles, no dead zone or lithium deposition occurs on the surface of the negative electrode plate, thereby ensuring the performance of the battery and effectively avoiding the safety problem.
In summary, compared with the prior art, the battery pole group with improved winding stress and the battery using the same provided by the invention bond the positive plate, the negative plate and the separator by the dry-pressing thermal composite technology. The PVDF coated on the diaphragm can provide a skeleton supporting effect, so that a space is reserved for the expansion of the negative plate in the charging and discharging processes, the stress problem of the wound battery can be obviously reduced, particularly the expansion stress problem of the negative plate at the corner of the wound battery is reduced, the cycle performance and the safety performance of the battery are improved, and the method has great practical significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A battery pole group for improving winding stress is characterized by comprising a positive pole piece, a negative pole piece and a diaphragm;
the battery pole group is prepared from a positive plate, a negative plate and a diaphragm in a winding mode;
the diaphragm is positioned between the positive plate and the negative plate;
the diaphragm includes a diaphragm base;
the upper surface and the lower surface of the diaphragm substrate are both coated with PVDF adhesive or a mixture containing ceramic materials and PVDF adhesive;
wherein, the PVDF adhesive is used for providing a skeleton supporting function;
for a mixture comprising a ceramic material and a PVDF binder, the PVDF is present in the mixture in a proportion of 10% to 30% by weight and the ceramic is present in a proportion of 70% to 90% by weight.
2. The battery pack as claimed in claim 1, wherein the separator substrate is made of polyethylene PE, polypropylene PP or a mixture of polyethylene PE and polypropylene PP.
3. The battery pack of claim 1, wherein the ceramic material is in particular Al2O3MgO-based inorganic metal oxide.
4. The battery pole pack of claim 1, wherein the PVDF binder is applied to the separator substrate as a spot coating.
5. The battery pack of claim 1, wherein the separator has a double-sided coating weight of 0.2 to 2.5g per square meter.
6. The battery pole group according to claim 1, wherein the positive plate, the negative plate and the separator are bonded by a dry-pressing thermal compounding technique;
wherein, the hot pressing temperature is 50-130 ℃, the hot pressing pressure is 0.2-7.0 MPa, and the hot pressing time is 3-90 s.
7. A wound lithium ion secondary battery comprising the battery electrode assembly according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010612024.8A CN111934025A (en) | 2020-06-30 | 2020-06-30 | Battery pole group for improving winding stress and battery using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010612024.8A CN111934025A (en) | 2020-06-30 | 2020-06-30 | Battery pole group for improving winding stress and battery using same |
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| Publication Number | Publication Date |
|---|---|
| CN111934025A true CN111934025A (en) | 2020-11-13 |
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|---|---|---|---|
| CN202010612024.8A Pending CN111934025A (en) | 2020-06-30 | 2020-06-30 | Battery pole group for improving winding stress and battery using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635716A (en) * | 2020-12-18 | 2021-04-09 | 南京国轩新能源有限公司 | Method for improving wrinkles of lithium ion battery negative plate |
| CN115117557A (en) * | 2021-03-19 | 2022-09-27 | 比亚迪股份有限公司 | Coiled battery diaphragm, coiled battery and vehicle |
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| CN110165287A (en) * | 2019-06-11 | 2019-08-23 | 东莞塔菲尔新能源科技有限公司 | A kind of cell winding device, battery core production method and power battery |
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2020
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| CN112635716A (en) * | 2020-12-18 | 2021-04-09 | 南京国轩新能源有限公司 | Method for improving wrinkles of lithium ion battery negative plate |
| CN115117557A (en) * | 2021-03-19 | 2022-09-27 | 比亚迪股份有限公司 | Coiled battery diaphragm, coiled battery and vehicle |
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Effective date of registration: 20220121 Address after: 266500 Minshan Road, Huangdao District, Qingdao, Shandong Applicant after: LISHEN (QINGDAO) NEW ENERGY CO.,LTD. Address before: No.38, South Haitai Road, Binhai high tech Industrial Development Zone, Binhai New Area, Tianjin Applicant before: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201113 |