CN100369315C - Production of lithium ion battery - Google Patents
Production of lithium ion battery Download PDFInfo
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- CN100369315C CN100369315C CNB200610013299XA CN200610013299A CN100369315C CN 100369315 C CN100369315 C CN 100369315C CN B200610013299X A CNB200610013299X A CN B200610013299XA CN 200610013299 A CN200610013299 A CN 200610013299A CN 100369315 C CN100369315 C CN 100369315C
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- battery
- barrier film
- polythene
- diaphragm
- positive
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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 present invention relates to a processing method for polythene diaphragms used in the production process of lithium ion batteries. The polythene diaphragm adopted in the present invention, of which the thickness is 12 to 25 microns is orderly processed by the following steps: step 1, the polythene diaphragm is put in a vacuum drying chamber under the pressure of minus 0.10MPa to 0.30MPa to lay aside for 1 to 2 hours; step 2, the polythene diaphragm is baked under the conditions of the pressure of minus 0.1MPa to 1.0MPa and the temperature of 40 DEG C to 100 DEG C for 12 to 48 hours; step 3, the polythene diaphragm is positioned under the condition of the pressure of minus 0.1MPa to 0.01MPa for natural cooling to room temperature. Furthermore, a positive and a negative electrodes of a battery are separated by the processed polythene diaphragm, and the positive and the negative electrodes and the polythene diaphragm are coiled. Moreover, coiled plates are arranged in an aluminium battery case, an electrolyte is then injected into a drying box, and finally, the battery is totally sealed. The present invention effectively improves the quality of the polythene diaphragm, and markedly improves the capacity of the battery and overcharge proof and needle prick proof properties, etc. The present invention also has the advantages of simple manufacturing process, high safety and reliability and wide ranges of application.
Description
Technical field
The present invention relates to a kind of manufacture method of battery, particularly a kind of manufacture method of lithium ion battery.
Background technology
At present, rechargeable lithium ion batteries, because it has the voltage height, in light weight, energy density is big, and self discharge is low etc., and advantage has obtained to use widely in the Portable instrument and equipment.But case type battery is under the situation of improper use, the abnormal gas that the chemical reaction of inside battery produces can make internal pressure increase, thereby the situation of battery explosion takes place, can cause damage to instrument and equipment like this, bring hidden danger also for simultaneously operation and user of service.Though lithium ion battery has many advantages, equally also there are many weak points in it, for example short circuit, overcharge, problem such as acupuncture.Therefore, the security feature that need improve battery from the material and the design aspect of battery.In order to solve the various security hidden troubles that exist in the battery, many researchers are carrying out a large amount of effort aspect the fail safe that improves battery; For example, add certain quantity of additive in electrolyte, some other particles of adding and inside battery are provided with certain components and parts in the barrier film, but can not reach desirable effect.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, by processing to the employed polyethylene barrier film of lithium ion battery; The manufacture method of the lithium ion battery of lithium ion battery overall performances such as capacity that a kind of technology simply, effectively improves battery and anti-over-charging, acupuncture is provided.
The technical solution adopted in the present invention is for achieving the above object: a kind of manufacture method of lithium ion battery, and lithium ion battery is made up of a positive pole, negative pole, layer of polyethylene barrier film and an electrolyte; The positive and negative electrode of battery is separated and the positive and negative plate of battery is reeled with barrier film, the pole piece of spooling is put into the battery case of aluminium matter, in drying box, inject the electrolyte in the battery case, again battery is sealed fully; It is characterized in that the polyethylene membrane thicknesses that adopts is 12～25 μ m, before the positive and negative electrode that adopts barrier film with battery separates and the positive and negative plate of battery reeled, at first the polyethylene barrier film carried out following processing in regular turn:
(1) the polyethylene barrier film being put into pressure left standstill 1～2 hour for the vacuum drying chamber of-0.10Mpa～0.30Mpa;
(2) above-mentioned polyethylene barrier film was dried 12～48 hours under the condition of-0.1Mpa～1.0Mpa and 40 ℃～100 ℃;
(3) above-mentioned polyethylene barrier film is placed-naturally cool to room temperature under 0.1Mpa～0.01Mpa condition.
The present invention compares with the manufacture method of existing lithium ion battery, has the following advantages:
1, battery uses the polyethylene diaphragm cell capacity after handling to increase to some extent.
2, the Short Circuit withstand performance of battery is significantly improved.
3, the overcharging resisting performance of battery is significantly improved.
4, the acupuncture performance of battery is significantly improved.
5, the hot strength of barrier film is enhanced.
The invention provides the processing method that is used for lithium ion battery separator, promptly the processed of in advance the polyethylene barrier film being carried out has effectively solved because the safety problem that the battery diaphragm thermal contraction that causes in the battery post production process causes the battery plus-negative plate loose contact.Not only improve the quality of barrier film, effectively improved simultaneously the overall performance of lithium ion batteries such as the capacity of battery and anti-over-charging, acupuncture.Its technology is simple, and effect is remarkable, is widely used.
Description of drawings
Fig. 1 carries out 60 ℃ of 4.3V short circuit contrast experiment curve charts with untreated lithium ion battery after the membrane treatment;
Fig. 2 carries out 2C5V with untreated lithium ion battery after the membrane treatment to overcharge contrast experiment's curve chart;
Fig. 3 is that lithium ion battery that barrier film is handled under different condition carries out 2C5V and overcharges contrast experiment's curve chart;
Fig. 4 carries out 3C5V with untreated lithium ion battery after the membrane treatment to overcharge contrast experiment's curve chart;
Fig. 5 carries out acupuncture contrast experiment curve chart with untreated lithium ion battery after the membrane treatment.
Embodiment
Below in conjunction with preferred embodiment and contrast experiment's curve chart, to details are as follows according to embodiment provided by the invention:
A kind of manufacture method of lithium ion battery, lithium ion battery is made up of a positive pole, negative pole, layer of polyethylene barrier film and an electrolyte; The positive and negative electrode of battery is separated and the positive and negative plate of battery is reeled with barrier film, the pole piece of spooling is put into the battery case of aluminium matter, in drying box, inject the electrolyte in the battery case, again battery is sealed fully.In the enforcement, the positive and negative electrode collector that lithium ion battery uses is aluminium foil, Copper Foil; As plus plate current-collecting body is aluminium foil (thickness 25 μ m, 20 μ m, 15 μ m), and negative current collector is Copper Foil (thickness 15 μ m, 10 μ m, 8 μ m).
The electrode terminal that lithium ion battery adopts is by the alloy of nickel bar, aluminum strip, copper bar and above-mentioned metal or is coated with the material of above-mentioned metal.
Anode material for lithium-ion batteries has cobalt acid lithium, lithium nickel cobalt dioxide; Negative material has the material with carbon element of Delanium, the reversible removal lithium embedded ion of MCMB; Use the liquid electrolyte of non-water simultaneously.Be mixed with 1～1.1mol/LLiPF by DME/DMC (volume ratio is 1: 1) mixing material
6Non-water liquid electrolyte as the lithium ion battery use.The polyethylene membrane thicknesses that the invention is characterized in employing is 12～25 μ m, before the positive and negative electrode that adopts barrier film with battery separates and it is reeled, at first the polyethylene barrier film is carried out following processing in regular turn:
(1) the polyethylene barrier film being put into pressure left standstill 1～2 hour for the vacuum drying chamber of-0.10Mpa～0.30Mpa;
(2) above-mentioned polyethylene barrier film was dried 12～48 hours under the condition of-0.1Mpa～1.0Mpa and 40 ℃～100 ℃;
(3) above-mentioned polyethylene barrier film is placed-naturally cool to room temperature under 0.1Mpa～0.01Mpa condition.
Embodiment 1 (is example with 043048 battery)
The positive active material of this rectangular cell adopts LiCoO
2, negative electrode active material adopts MCMB, and electrolyte uses 1mol/LLiPF
6EC/DMC, the vacuum drying chamber of earlier 25 μ m polyethylene barrier films being put into pressure and be 0.30Mpa left standstill 1 hour, to its oven dry 48 hours under the condition of-1.0Mpa and 100 ℃, at last it was naturally cooled to room temperature under the 0.01Mpa state then.The lithium ion battery of this model uses behind the above-mentioned barrier film discharging efficiency first to exceed 1.0% than the battery of untreated barrier film.
Example 2 (is example with 053450 battery)
The positive active material of this rectangular cell is all identical with example 1 with electrolyte, and negative electrode active material adopts graphite, 20 μ m polyethylene barrier films are put into pressure and were left standstill 2 hours for the vacuum drying chamber of-0.10Mpa, then to its oven dry 24 hours under the condition of-0.1Mpa and 60 ℃, at last it is used as barrier film after naturally cooling to room temperature under the-0.1Mpa state.Use handling metacneme lithium ion battery that is assembled into and the battery that uses the barrier film that is untreated to be assembled into, to carry out temperature be 60 ℃, the voltage short circuit experiment as 4.3V, can both pass through this test smoothly though the result shows the lithium ion battery of two kinds of barrier films.But the battery temperature behind the processing barrier film is lower than 10 ℃ on the battery (referring to Fig. 1) of the barrier film that is untreated.
Example 3 (is example with 043450 battery)
The positive active material of this rectangular cell adopts LiNi
0.7Co
0.3O
2, and negative electrode active material adopts graphite, electrolyte is DME/DMC (volume ratio is 1: 1) 1.05mol/LLiPF
6, 16 μ m polyethylene barrier films are put into pressure and were left standstill 2 hours for the vacuum drying chamber of-0.10Mpa, then to its oven dry 24 hours under the condition of-0.1Mpa and 60 ℃, at last it are used as barrier film after naturally cooling to room temperature under the-0.1Mpa state.Barrier film lithium ion battery after use is handled has carried out the experiment of 2C5V overcharging resisting with the battery that uses the barrier film that is untreated to be assembled into, and proves that the battery temperature behind the processing barrier film is lower than 3 ℃ on untreated battery (referring to Fig. 2).
Example 4 (is example with 043450 battery)
The positive active material of this rectangular cell, negative electrode active material is all identical with example 2 with electrolyte, 16 μ m polyethylene barrier films are put into pressure and were left standstill 2 hours for the vacuum drying chamber of-0.10Mpa, then to its oven dry 24 hours under the condition of-0.1Mpa and 80 ℃, at last it is naturally cooled to room temperature under-0.1Mpa state.Respectively to using this barrier film lithium ion battery that is assembled into and the battery that uses 24 hours 16 μ mPE barrier films of 60 ℃ of oven dry to be assembled into to carry out the experiment of 2C5V overcharging resisting, these two kinds of lithium ion batteries of presentation of results all can pass through standard, but the over-charging of battery temperature that 80 ℃ of oven dry are assembled behind the barrier film will be lower than 25 ℃ on the battery of being assembled behind 60 ℃ of oven dry barrier films (referring to Fig. 3).
Example 5 (is example with 043450 battery)
The positive active material of this rectangular cell, negative electrode active material is all identical with example 2 with electrolyte, 16 μ m polyethylene barrier films are put into pressure and were left standstill 2 hours for the vacuum drying chamber of-0.10Mpa, then to its oven dry 48 hours under the condition of-0.1Mpa and 100 ℃, at last it is naturally cooled to room temperature under-0.1Mpa state.Use the barrier film overcharge resistance performance of Li-ion batteries of handling to be significantly improved, carried out 3C5V and overcharge experiment be untreated battery that barrier film is assembled into of use, the result shows and uses the lithium ion battery of handling metacneme can pass through this test (referring to Fig. 4) smoothly.
Example 6 (is example with 053048 battery)
The positive active material of this rectangular cell is LiCoO
2, electrolyte is DME/DMC (volume ratio is 1: 1) 1.1mol/LLiPF
6, it is that the vacuum drying chamber of 0.0Mpa left standstill 2 hours that 12 μ m polyethylene barrier films are put into pressure, oven dry 48 hours under the condition of 0.0Mpa and 40 ℃, 60 ℃, 80 ℃ respectively naturally cools to room temperature with it at last under the 0.0Mpa state.The battery that uses the processing metacneme to be assembled into is carried out the acupuncture experiment, can reduce the temperature (referring to Fig. 5) of battery acupuncture after the presentation of results barrier film is handled.
Example 7 (contrast experiment)
It is that the vacuum drying chamber of 0.0Mpa left standstill 2 hours that the polyethylene barrier film is put into pressure, and oven dry 24 hours under the condition of 0.0Mpa and 50 ℃, 70 ℃ respectively naturally cools to room temperature with it at last under the 0.0Mpa state.To be untreated, three kinds of barrier films after 50 ℃, 70 ℃ processing have carried out the hot strength contrast test.The hot strength of barrier film is respectively 1280N/mm
2, 1330N/mm
2, 1380N/mm
2Battery is carried out hot case experiment can effectively be reduced because the safety problem that the barrier film thermal contraction causes the both positive and negative polarity contact.
Above-mentioned detailed description of the manufacture method of this lithium ion battery being carried out with reference to embodiment is illustrative rather than determinate, therefore in the variation and the modification that do not break away under the general plotting of the present invention, should belong within protection scope of the present invention.
Claims (1)
1. the manufacture method of a lithium ion battery, lithium ion battery is made up of a positive pole, negative pole, layer of polyethylene barrier film and an electrolyte; The positive and negative electrode of battery is separated and the positive and negative plate of battery is reeled with barrier film, the pole piece of spooling is put into the battery case of aluminium matter, in drying box, inject the electrolyte in the battery case, again battery is sealed fully; It is characterized in that the polyethylene membrane thicknesses that adopts is 12～25 μ m, before the positive and negative electrode that adopts barrier film with battery separates and the positive and negative plate of battery reeled, at first the polyethylene barrier film carried out following processing in regular turn:
(1) the polyethylene barrier film being put into pressure left standstill 1～2 hour for the vacuum drying chamber of-0.10Mpa～0.30Mpa;
(2) above-mentioned polyethylene barrier film was dried 12～48 hours under the condition of-0.1Mpa～1.0Mpa and 40 ℃～100 ℃;
(3) above-mentioned polyethylene barrier film is placed-naturally cool to room temperature under 0.1Mpa～0.01Mpa condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610013299XA CN100369315C (en) | 2006-03-14 | 2006-03-14 | Production of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610013299XA CN100369315C (en) | 2006-03-14 | 2006-03-14 | Production of lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN1819322A CN1819322A (en) | 2006-08-16 |
| CN100369315C true CN100369315C (en) | 2008-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610013299XA Expired - Fee Related CN100369315C (en) | 2006-03-14 | 2006-03-14 | Production of lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103311485B (en) * | 2013-05-06 | 2015-09-23 | 北京鼎能开源电池科技股份有限公司 | The method of lithium ion battery separator surface ceramic deposition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2433737Y (en) * | 2000-06-15 | 2001-06-06 | 华南理工大学 | Lithium ion power cell |
| WO2004024809A1 (en) * | 2002-09-13 | 2004-03-25 | Asahi Kasei Kabushiki Kaisha | Microporous film and method for production thereof |
| JP2004161899A (en) * | 2002-11-13 | 2004-06-10 | Tonen Chem Corp | Film with minute pore and its manufacturing method and use |
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2006
- 2006-03-14 CN CNB200610013299XA patent/CN100369315C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2433737Y (en) * | 2000-06-15 | 2001-06-06 | 华南理工大学 | Lithium ion power cell |
| WO2004024809A1 (en) * | 2002-09-13 | 2004-03-25 | Asahi Kasei Kabushiki Kaisha | Microporous film and method for production thereof |
| JP2004161899A (en) * | 2002-11-13 | 2004-06-10 | Tonen Chem Corp | Film with minute pore and its manufacturing method and use |
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| CN1819322A (en) | 2006-08-16 |
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