CN111162307A - Lithium ion battery for inhibiting corrosion of aluminum plastic film of soft package battery and production process thereof - Google Patents
Lithium ion battery for inhibiting corrosion of aluminum plastic film of soft package battery and production process thereof Download PDFInfo
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- CN111162307A CN111162307A CN202010128791.1A CN202010128791A CN111162307A CN 111162307 A CN111162307 A CN 111162307A CN 202010128791 A CN202010128791 A CN 202010128791A CN 111162307 A CN111162307 A CN 111162307A
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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 invention discloses a lithium ion battery for inhibiting the corrosion of an aluminum-plastic film of a soft package battery, wherein the aluminum-plastic film of the lithium ion battery comprises an innermost inner protective layer, a middle aluminum layer and an outermost outer protective layer, a circle of sealing area is arranged at the edge of the aluminum-plastic film, a positive electrode lug and a negative electrode lug of the lithium ion battery are fixed in the sealing area, a positive electrode sealing area is arranged between the positive electrode lug and the aluminum-plastic film, a negative electrode sealing area is arranged between the negative electrode lug and the aluminum-plastic film, and partial areas between the positive electrode lug and the aluminum-plastic film are in mutual contact. The soft package lithium ion battery disclosed by the invention has high corrosion resistance and reliability, and can greatly reduce the aluminum plastic film corrosion leakage fault in the use process of a battery module and a system, thereby reducing the return rate of the battery.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery for inhibiting the corrosion of an aluminum plastic film of a soft package battery and a production process thereof.
Background
Lithium ion batteries have been the focus of research in recent years due to their advantages of low cost, high energy density, long cycle life, etc. It has been widely used in the fields of digital code, energy storage, communication, electric vehicle, etc.
At present, lithium ion power batteries can be classified into soft package batteries, cylindrical batteries and square metal shell batteries according to the appearance specifications and shell materials. Wherein cylindrical battery has set up pressure flip structure in top cap department, can in time cut off positive negative pole and connect when the battery is inside to take place the thermal runaway. The square metal shell battery is generally large in size, is suitable for large-capacity batteries, and is mostly applied to the fields of electric automobiles, energy storage and the like. In order to control the safety and realize the reliability of the structure, the cover plate structure of the square metal can battery is generally complicated, and thus the cost is high. The soft package lithium ion battery has the advantages of high specific energy, low cost, strong model compatibility and the like because the shell material of the soft package lithium ion battery adopts a multi-layer aluminum-plastic film composite film (aluminum-plastic film) which is easy to form and process, so that the market share of the soft package lithium ion battery is increased year by year in the field of electric automobiles in recent years.
The structure of the aluminum plastic film generally comprises an innermost PP layer which is used for isolating electrolyte and sealing and bonding. The middle is an aluminum layer which mainly plays a role in preventing external air and moisture from entering the interior of the battery core. The outmost layer is a composite layer of nylon or nylon and PET, and the composite layer mainly serves to protect the aluminum layer and prevent the aluminum layer from being corroded and damaged by external machinery. In the manufacturing process of the battery, the aluminum-plastic film is firstly punched into a concave shape, then the top and the single side part are subjected to heat sealing, the other side of the battery is subjected to heat sealing after liquid injection, and the side is reserved with the gas buffering air bag. After the battery is finished with the procedures of formation and the like, gas and redundant electrolyte in the battery are extracted, and then air bag cutting and secondary packaging are carried out. However, in the secondary sealing process, due to the electrolyte existing inside, the electrolyte is gasified at high temperature, so that the problems of bubbles, cracks and the like of PP inside the aluminum-plastic film during secondary sealing are caused, and finally, an aluminum layer in the middle of the aluminum-plastic film is directly contacted with the internal electrolyte. When micro powder or burrs of the negative electrode inside the battery core are in micro contact with the aluminum layer of the aluminum-plastic film, or when the negative electrode tab is in micro contact with the aluminum-plastic film during top sealing, the aluminum layer of the aluminum-plastic film can form aluminum-lithium alloy with lithium ions inside the battery, and then the aluminum-plastic film is corroded to leak liquid.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a soft package lithium battery with high corrosion resistance and high reliability and a corresponding production process.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an restrain lithium ion battery that laminate polymer battery plastic-aluminum membrane corrodes, lithium ion battery's plastic-aluminum membrane includes the inner protective layer of inlayer, middle aluminium lamination and the outer protective layer of outermost layer, the plastic-aluminum membrane edge is equipped with the round sealing area, lithium ion battery's anodal ear and negative pole ear are fixed in the sealing area, be equipped with anodal seal district between anodal ear and the plastic-aluminum membrane, be equipped with negative pole seal district between negative pole ear and the plastic-aluminum membrane, partial region mutual contact between anodal ear and the plastic-aluminum membrane.
The area of the mutual contact between the positive lug and the aluminum plastic film accounts for 5% -60% of the area of the positive sealing area of the positive lug, and the resistance of the mutual contact area between the positive lug and the aluminum plastic film is 0-1M omega.
The outer side edge of the positive electrode seal area, which is close to the aluminum-plastic film, is provided with a positive electrode over-seal area, and the positive electrode over-seal area is an area where a positive electrode lug and the aluminum-plastic film are in mutual contact.
The lithium battery is a winding type soft package battery, a winding core is arranged inside the lithium battery, and the outmost layer of the winding core is a positive electrode or a diaphragm.
The lithium battery is a laminated soft package battery, a stack core is arranged inside the lithium battery, and the outermost layer of the stack core is a positive electrode or a diaphragm.
The laminated core is of a Z-shaped laminated structure, the outermost layer of the laminated core is a diaphragm, the diaphragm is wound for 0.5-2 weeks, and the side, which is not coated by the diaphragm, of the negative plate of the laminated core is positioned on the different sides of the aluminum-plastic film seal pre-sealing area and the two formal seal areas.
A production process for producing the lithium ion battery comprises the following steps:
1) the edge of the aluminum-plastic film is heat-sealed to form a battery area and a gas buffering air bag, and a liquid injection port is reserved beside the gas buffering air bag;
2) injecting liquid into the aluminum-plastic film battery area, and completing the battery preparation process;
3) extracting gas and redundant electrolyte in the aluminum-plastic film battery area;
4) cutting off the gas buffering air bag, and performing secondary heat sealing on the liquid injection port;
in the step 1), after the edge heat sealing is finished, carrying out secondary heat sealing on the positive electrode sealing area of the aluminum-plastic film fixed positive electrode lug to form a positive electrode over-sealing area;
in the step 4), the secondary heat sealing is performed by first performing pre-sealing, removing the electrolyte at the sealing position in the pre-sealing process to form a secondary pre-sealing area, and then performing packaging to form a secondary formal sealing area.
The heat sealing temperature of the middle edge in the step 1) is 170-195 ℃, and the heat sealing temperature of the positive pole seal passing area is 175-220 ℃.
The heat sealing temperature of the two pre-sealing areas in the step 4) is 170-190 ℃, the melting amount of the inner protective layer is 10% -30%, the heat sealing temperature of the two formal sealing areas is 170-195 ℃, and the melting amount of the inner protective layer is 30% -45%; the two-seal pre-seal area and the two-seal formal seal area are located at the same position, and the two-seal pre-seal area is 0.5-5 mm wider than the two-seal formal seal area.
The soft package lithium ion battery disclosed by the invention has high corrosion resistance and reliability, and can greatly reduce the aluminum plastic film corrosion leakage fault in the use process of a battery module and a system, thereby reducing the return rate of the battery.
Drawings
The following is a brief description of the contents of each figure and the symbols in the figures in the description of the invention:
FIG. 1 is a schematic diagram of a soft-packed lithium battery according to the present invention;
the labels in the above figures are: 1. a positive tab; 2. a negative tab; 3. a positive electrode seal region; 4. a negative electrode sealing area; 5. a positive over-sealing region; 6. an air bag; 7. two pre-sealing areas; 8. two formal sealing areas; 9. a side seal region.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
The lithium battery is provided with an aluminum-plastic film, as shown in fig. 1, a circle of sealing ring is arranged around the aluminum-plastic film, a cavity for placing a battery cell is arranged in the sealing area, and an air bag 6 can be sealed at one side of the aluminum-plastic film. The sealing area at the top is a top seal, and the top seal fixes the positive electrode tab 1 and the negative electrode tab 2 in the sealing area and forms a corresponding positive electrode sealing area 3 and a corresponding negative electrode sealing area 4.
When the top sealing process is used for sealing the top, the used method that the positive lug 1 is in contact with the aluminum-plastic film or in micro contact can be used for carrying out structural transformation on the top sealing head, the sealing thickness of a partial area is limited, and therefore the thickness of a packaging area is controlled during top sealing. The positive electrode sealing area 3 can also be sealed to form a positive electrode sealing area 5, so that the positive electrode tab 1 is in contact or micro-contact with the aluminum-plastic film, and the aluminum-plastic film potential is separated from the aluminum-lithium alloy to form a potential.
In order to ensure the sealing performance of the sealing position of the positive tab 1, the area of the contact or micro-contact area of the positive tab 1 and the aluminum plastic film accounts for 5-60% of the area of the positive electrode over-sealing area 5, and a continuous through channel perpendicular to the sealing can not be formed. The insulation resistance between the positive tab 1 and the aluminum-plastic film formed by contact or micro contact is 0-1M omega, and the insulation resistance between the negative tab 2 and the aluminum-plastic film is ensured to be more than or equal to 5M omega.
When the top seal is carried out, the first heat sealing temperature is set to be 170-195 ℃, the second heat sealing is carried out on the positive top seal position, the regional over sealing is realized by controlling the temperature, the pressure and the seal thickness, and the second heat sealing temperature is set to be 175-220 ℃.
After the battery is finished with the procedures of formation and the like, gas and redundant electrolyte in the battery are pumped out, then the airbag 6 is cut off and packaged for the second time, and when the second time is used, the first time is used for pre-sealing, the purpose of pre-sealing is to remove the electrolyte at the sealing part, and then the second time is used for packaging.
Specifically, the temperature for pre-sealing in the secondary sealing process is set to be 170-190 ℃, and the melting amount (PP thickness loss) of the inner layer PP in the pre-sealing process is 10-30%. The temperature of formal secondary sealing after pre-sealing is set to be 170-195 ℃. The melting amount (PP thickness loss amount) of the inner layer PP in formal secondary sealing after pre-sealing is 30-45%. And the width of the pre-sealed seal is 0.5-5 mm beyond the seal of the formal second seal towards the battery cell side.
The lithium ion battery for inhibiting the corrosion of the aluminum plastic film of the soft package battery is used for any anode material and cathode material, and is also suitable for solid lithium ion batteries.
When a winding structure is adopted, the outermost layer of the winding core is a positive electrode or a diaphragm so as to prevent the negative electrode from contacting the damaged part of the aluminum plastic film.
When a laminated structure is adopted, the outermost side of the laminated core is a positive electrode or a diaphragm. Preferably, the outermost diaphragm is wound around the battery cell for 0.5-2 weeks so as to isolate direct contact between the stacked core micro powder and burrs and the aluminum plastic film. The winding structure adopts a Z-shaped lamination structure, and the side of the Z-shaped laminated core, which is not coated by the diaphragm, is opposite to the two sealing sides, because the aluminum layer inside the aluminum-plastic film is most easily exposed at the two sealing sides.
One possible example is listed below, but the embodiment is not limited to the following example.
The production process for producing the lithium ion battery comprises the following steps:
1. z-shaped lamination is carried out on the electrodes made of the ternary positive electrode and the graphite negative electrode, and the diaphragm is wound around the lamination core for 1.5 cycles after lamination;
2. the top sealing temperature of the aluminum-plastic film is set to 185 ℃, the PP sol content of the aluminum-plastic film is 40%, and the melting amount of the tab glue in the normal packaging area of the positive and negative tabs 2 is 35%; the positive tab 1 is sealed the region and is close to the top of top seal, crosses the front cover and takes up 20% of the utmost point ear department encapsulation area. After top sealing, the insulation resistance of the positive tab 1 and the aluminum plastic film is not more than 1M omega, and the insulation resistance of the negative tab 2 and the aluminum plastic film is not less than 100M omega;
3. the side of the Z-shaped stacked core, which is not coated by the diaphragm, is sealed at the opposite side by the two sealing edges during top sealing;
4. the battery core is dried, injected with liquid, laterally sealed and formed;
5. the pre-sealing temperature in the secondary sealing is 180 ℃, the PP melting amount is 20%, and the seal width is 8 mm;
6. the temperature of formal secondary sealing after pre-sealing is 180 ℃, the PP melting amount is 40%, the width of the seal is 6mm, and the formal seal and the pre-seal are superposed at the side edge far away from the electric core;
7. and carrying out processes such as capacity grading and the like on the secondary-sealed battery to finish the manufacturing of the battery.
100 batteries prepared in the way are placed in an environment with 60 ℃ and 90% RH for 60 days, and whether the aluminum-plastic film corrosion exists outside the battery core is observed. The test result shows that the aluminum-plastic film corrosion does not occur in all the batteries.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (9)
1. The utility model provides an restrain lithium ion battery that laminate polymer battery plastic-aluminum membrane corrodes, lithium ion battery's plastic-aluminum membrane includes the inner protective layer of inlayer, middle aluminium lamination and the outer protective layer of outermost layer, the plastic-aluminum membrane edge is equipped with the round sealing area, lithium ion battery's anodal ear and negative pole ear are fixed in the sealing area, be equipped with anodal seal district between anodal ear and the plastic-aluminum membrane, be equipped with negative pole seal district, its characterized in that between negative pole ear and the plastic-aluminum membrane: and partial areas between the positive lug and the aluminum plastic film are mutually contacted.
2. The lithium ion battery for inhibiting the aluminum plastic film corrosion of the soft package battery according to claim 1, characterized in that: the area of the mutual contact between the positive lug and the aluminum plastic film accounts for 5% -60% of the area of the positive sealing area of the positive lug, and the resistance of the mutual contact area between the positive lug and the aluminum plastic film is 0-1M omega.
3. The lithium ion battery for inhibiting the corrosion of the aluminum plastic film of the soft package battery according to claim 1 or 2, wherein: the outer side edge of the positive electrode seal area, which is close to the aluminum-plastic film, is provided with a positive electrode over-seal area, and the positive electrode over-seal area is an area where a positive electrode lug and the aluminum-plastic film are in mutual contact.
4. The lithium ion battery for inhibiting the aluminum plastic film corrosion of the soft package battery according to claim 3, characterized in that: the lithium battery is a winding type soft package battery, a winding core is arranged inside the lithium battery, and the outmost layer of the winding core is a positive electrode or a diaphragm.
5. The lithium ion battery for inhibiting the aluminum plastic film corrosion of the soft package battery according to claim 3, characterized in that: the lithium battery is a laminated soft package battery, a stack core is arranged inside the lithium battery, and the outermost layer of the stack core is a positive electrode or a diaphragm.
6. The lithium ion battery for inhibiting the aluminum plastic film corrosion of the soft package battery according to claim 5, characterized in that: the laminated core is of a Z-shaped laminated structure, the outermost layer of the laminated core is a diaphragm, the diaphragm is wound for 0.5-2 weeks, and the side, which is not coated by the diaphragm, of the negative plate of the laminated core is positioned on the different sides of the aluminum-plastic film seal pre-sealing area and the two formal seal areas.
7. A process for producing a lithium-ion battery according to any of claims 1 to 6, comprising the following steps:
1) the edge of the aluminum-plastic film is heat-sealed to form a battery area and a gas buffering air bag, and a liquid injection port is reserved beside the gas buffering air bag;
2) injecting liquid into the aluminum-plastic film battery area, and completing the battery preparation process;
3) extracting gas and redundant electrolyte in the aluminum-plastic film battery area;
4) cutting off the gas buffering air bag, and performing secondary heat sealing on the liquid injection port;
the method is characterized in that:
in the step 1), after the edge heat sealing is finished, carrying out secondary heat sealing on the positive electrode sealing area of the aluminum-plastic film fixed positive electrode lug to form a positive electrode over-sealing area;
in the step 4), the secondary heat sealing is performed by first performing pre-sealing, removing the electrolyte at the sealing position in the pre-sealing process to form a secondary pre-sealing area, and then performing packaging to form a secondary formal sealing area.
8. The production process according to claim 7, characterized in that: the heat sealing temperature of the middle edge in the step 1) is 170-195 ℃, and the heat sealing temperature of the positive pole seal passing area is 175-220 ℃.
9. The production process according to claim 7 or 8, characterized in that: the heat sealing temperature of the two pre-sealing areas in the step 4) is 170-190 ℃, the melting amount of the inner protective layer is 10% -30%, the heat sealing temperature of the two formal sealing areas is 170-195 ℃, and the melting amount of the inner protective layer is 30% -45%; the two-seal pre-seal area and the two-seal formal seal area are located at the same position, and the two-seal pre-seal area is 0.5-5 mm wider than the two-seal formal seal area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010128791.1A CN111162307A (en) | 2020-02-28 | 2020-02-28 | Lithium ion battery for inhibiting corrosion of aluminum plastic film of soft package battery and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010128791.1A CN111162307A (en) | 2020-02-28 | 2020-02-28 | Lithium ion battery for inhibiting corrosion of aluminum plastic film of soft package battery and production process thereof |
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| CN111162307A true CN111162307A (en) | 2020-05-15 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769218A (en) * | 2020-07-13 | 2020-10-13 | 苏州凌威新能源科技有限公司 | Soft package battery packaging method |
| CN113178613A (en) * | 2021-05-13 | 2021-07-27 | 苏州清陶新能源科技有限公司 | Secondary packaging method and forming method of soft package battery and soft package battery |
| CN113363555A (en) * | 2021-04-30 | 2021-09-07 | 万向一二三股份公司 | Lithium ion battery for improving leakage failure of soft package battery and packaging process thereof |
| CN113851792A (en) * | 2021-10-25 | 2021-12-28 | 珠海冠宇电池股份有限公司 | Soft package lithium ion battery and electronic device |
| CN113871808A (en) * | 2021-10-25 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Soft package lithium ion battery and electronic device |
| CN117458054A (en) * | 2023-12-25 | 2024-01-26 | 中航锂电（洛阳）有限公司 | Partial pressure structure, battery monomer, battery and power consumption device |
-
2020
- 2020-02-28 CN CN202010128791.1A patent/CN111162307A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769218A (en) * | 2020-07-13 | 2020-10-13 | 苏州凌威新能源科技有限公司 | Soft package battery packaging method |
| CN113363555A (en) * | 2021-04-30 | 2021-09-07 | 万向一二三股份公司 | Lithium ion battery for improving leakage failure of soft package battery and packaging process thereof |
| CN113178613A (en) * | 2021-05-13 | 2021-07-27 | 苏州清陶新能源科技有限公司 | Secondary packaging method and forming method of soft package battery and soft package battery |
| CN113178613B (en) * | 2021-05-13 | 2023-01-24 | 苏州清陶新能源科技有限公司 | Secondary packaging method and forming method of soft package battery and soft package battery |
| CN113851792A (en) * | 2021-10-25 | 2021-12-28 | 珠海冠宇电池股份有限公司 | Soft package lithium ion battery and electronic device |
| CN113871808A (en) * | 2021-10-25 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Soft package lithium ion battery and electronic device |
| CN113871808B (en) * | 2021-10-25 | 2024-03-26 | 珠海冠宇电池股份有限公司 | Soft package lithium ion battery and electronic device |
| CN117458054A (en) * | 2023-12-25 | 2024-01-26 | 中航锂电（洛阳）有限公司 | Partial pressure structure, battery monomer, battery and power consumption device |
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