CN115360462A - Method for improving power performance of cylindrical lithium ion battery - Google Patents
Method for improving power performance of cylindrical lithium ion battery Download PDFInfo
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- CN115360462A CN115360462A CN202210619281.3A CN202210619281A CN115360462A CN 115360462 A CN115360462 A CN 115360462A CN 202210619281 A CN202210619281 A CN 202210619281A CN 115360462 A CN115360462 A CN 115360462A
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- sealing ring
- sealing
- lithium ion
- ion battery
- improving
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/172—Arrangements of electric connectors penetrating the casing
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
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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
- H01M50/30—Arrangements for facilitating escape of gases
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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
Abstract
The invention relates to a method for improving the power performance of a cylindrical lithium ion battery. The invention relates to a method for improving the power performance of a cylindrical lithium ion battery, which comprises the steps of preparing a steel shell with a gradually-thinned shell opening, preparing a top cover integrating a pole cover plate and a sealing ring, wherein the outer side of the sealing ring comprises a sealing rib structure, and then sealing by adopting an assembly process known in the industry and a rolling groove sealing mode. The battery prepared by the method can realize that the explosion-proof valve and the positive and negative pole posts of the battery are positioned at two sides of the battery so as to ensure the safety of the battery pack. In addition, the anode and cathode poles have enough welding space to ensure the overcurrent capacity of the battery. The power performance of the battery is improved on the basis of the existing process flow. The method can be used for carrying out simple tool reconstruction on the basis of the existing equipment, can effectively reduce equipment investment, and keeps the processing speed of the existing equipment and the process flow.
Description
Technical Field
The invention relates to the field of electrical performance of lithium ion batteries, in particular to a method for improving the power performance of a cylindrical lithium ion battery.
Background
The traditional cylindrical lithium ion battery is assembled in a rolling groove sealing mode, and the mode is simple to operate and high in processing speed. However, the battery pack is manufactured by adopting a mode of welding the connecting rows at two ends, so that battery grouping material waste and structural disorder can be caused. At present, part of enterprises weld the connecting bar on the same side, and the explosion-proof valve is arranged in the top cover of the positive electrode side, so that the circuit is damaged when the battery explodes and spouts, and the safety of a terminal client is endangered.
The novel cylindrical battery is assembled by adopting a mode that the pole and the explosion-proof valve are arranged on different sides (the positive pole and the negative pole are arranged on the same side, and the explosion-proof valve is arranged on the other side). Therefore, the connecting bar and the explosion-proof valve are not on the same side, and the circuit safety is not affected even if the battery is exploded. Adopt the mode that traditional slot rolling sealed, combine utmost point post and explosion-proof valve heterolateral can greatly reduced battery's multiplying power performance, this is because the mode that the slot rolling sealed, and the part at the edge of sealing is too narrow, can't carry out the output of big multiplying power electric current.
At present, most of the schemes for improving the rate of cylindrical batteries are greatly changed in structure, such as: a high-rate power lithium ion battery (CN 2807494Y) and a cylindrical lithium ion power battery (CN 201215816Y). Or only pay attention to the improvement of the multiplying power inside the battery cell, such as: the positive electrode adopts a high-rate cylindrical lithium ion battery (CN 102117931B) of modified lithium manganate, a structure (CN 102122705B) of a secondary cylindrical battery with 50-rate discharge capacity and the like. The structure and the method can not achieve the advantages of small production change, high efficiency, different sides of the explosion-proof valve and the pole and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for preparing a battery by using a novel steel shell and sealing ring structure.
A method for improving the functional performance of a cylindrical lithium ion battery comprises the following steps:
firstly, preparing a steel shell with a gradually thinned shell opening, wherein the thickness of the shell is 0.4-0.6mm, and the thickness of the shell opening is 0.2-0.3mm;
then preparing a top cover integrating the pole and a sealing ring, wherein the outer side of the sealing ring comprises a sealing rib structure;
and finally, sealing by adopting an assembly process known in the industry and a rolling groove sealing mode and sealing by adopting a pier sealing mode.
The top cover integrating the pole and the sealing ring is realized in an injection molding mode. The injection molding sealing ring is made of elastic sealing rubber, PP or PBT material.
The gradually thinned steel shell is gradually thinned from a position 10-30mm away from the top end opening to the top end opening of the shell opening. The steel shell is usually 0.4-0.6mm thick and 0.2-0.3mm thick at the shell opening. The bottom of the steel shell is provided with an explosion-proof valve which is directly imprinted at the bottom of the battery.
In the top cover integrating the pole and the sealing ring, the sealing ring annularly wraps the top cover, the lower surface of the sealing ring is exposed out of the current collecting plate welding area, and the upper surface of the sealing ring is exposed out of the external pole; the thickness of the top cover is 0.1-0.3mm.
The upper part of the sealing ring wraps the side face of the external pole, and the section of the sealing rib on the outer side of the sealing ring is of a trapezoidal structure or a semicircular structure.
The height of the sealing rib of the sealing ring is 10-30% of the thickness of the corresponding sealing ring.
The height of the sealing rib of the sealing ring is 10% -30% of the thickness of the corresponding sealing ring; the distance between the sealing rib on the sealing ring and the outermost ring of the sealing ring is 0.5-1.5mm.
The depth of the rolling groove is larger than the position of the sealing rib of the sealing ring when the rolling groove is sealed. After sealing, the shell opening is pressed below a sealing ring outside the coated pole, so that the shell opening and the pole are separated by the sealing ring; after sealing, the upper steel shell of the sealing ring is in a horizontal state; the sealing rib of the sealing ring is flattened after sealing and is flush with the edge sealing ring.
The invention has the following beneficial effects:
the invention can be realized by only partially improving the tool on the basis of the existing equipment; the invention can ensure the battery multiplying power performance and the sealing performance of the battery. The method and the structure are simple to process and easy to produce and use in large scale.
The battery prepared by the invention can realize that the explosion-proof valve and the positive and negative electrode posts of the battery are positioned at two sides of the battery so as to ensure the safety of the battery pack. In addition, the anode and cathode poles have enough welding space to ensure the overcurrent capacity of the battery. The power performance of the battery is improved on the basis of the existing process flow. The method can be used for carrying out simple tool reconstruction on the basis of the existing equipment, can effectively reduce equipment investment, and keeps the processing speed of the existing equipment and process flow. The method is simple to operate and is obviously easy for large-scale production and application.
Drawings
FIG. 1 is a structural view of a steel shell in example 1 of the present invention;
FIG. 2 is a top view of the pole cover plate and the seal ring in accordance with example 1 of the present invention;
FIG. 3 is a view showing a battery according to example 1 of the present invention after sealing;
FIG. 4 is a top view of a pole cover and a seal ring integrated in one embodiment 2 of the present invention;
fig. 5 is a diagram showing the battery according to example 2 of the present invention after sealing.
Detailed Description
The invention will be further explained by the following examples in conjunction with the drawings.
Example 1
A method for improving the functional performance of a cylindrical lithium ion battery comprises the following steps:
(1) And manufacturing a battery steel shell 1 (shown in figure 1) with a gradually thinned shell opening to ensure that no wrinkles occur after the shell opening is sealed. The processing utmost point post apron and integrative top cap (positive post 3) sealing washer 2 outsides of sealing washer contain sealed muscle structure (see fig. 2).
(2) And (4) assembling the battery according to a rolling groove process, and sealing the battery in a pier sealing mode. The shell opening is ensured to be pressed below the sealing ring coated outside the pole, and the shell opening and the pole are separated by the sealing ring (see figure 3: a steel shell 1, a sealing ring 2, a positive pole 3, a positive current collecting disc 4, a pole group 5 and a negative current collecting disc 6).
The battery shell in the step (1) is made of steel, and the shell opening is gradually thinned above the rolling groove part.
The steel shell is usually 0.4-0.6mm thick and 0.2-0.3mm thick at the shell opening.
The bottom of the steel shell is provided with an explosion-proof valve which is directly imprinted at the bottom of the battery.
The pole and the cover plate in the step (1) are of an integrated structure and are made of aluminum. The cover plate is annularly wrapped by the sealing ring, a current collecting plate welding area is exposed below the sealing ring, and an external pole is exposed above the sealing ring.
The cover plate and pole integrated structure requires that the thickness of the cover plate is 0.1-0.3mm.
The upper part of the sealing ring is wrapped on the side surface of the external pole so as to ensure that the battery steel shell does not contact with the pole when sealed.
The sealing ring is made of elastic rubber, and can be made of PP, PBT and the like.
The sealing ring is provided with a circle of sealing ribs, and the section of each sealing rib can be of a trapezoidal structure or a semicircular structure.
The height of the sealing rib of the sealing ring is 10-30% of the thickness of the corresponding sealing ring.
The distance between the sealing rib on the sealing ring and the outermost ring of the sealing ring is 0.5-1.5mm.
And (3) in the step (2), the depth of the rolling groove is greater than the position of the sealing rib of the sealing ring. After sealing, the opening of the shell is pressed below the sealing ring outside the coated pole, so that the opening of the shell and the pole are separated by the sealing ring.
The upper steel shell of the sealing ring is in a plane state after the sealing.
The sealing rib of the sealing ring after sealing is flattened and is flattened with the edge sealing ring.
Example 2
A method for improving the functional performance of a cylindrical lithium ion battery is characterized by comprising the following steps:
(1) And manufacturing a battery steel shell with a gradually thinned shell opening to ensure that no wrinkles occur after the shell opening is sealed. And processing a top cover (a sealing ring 2 and a positive pole 3) integrating the pole cover plate and the sealing ring, and adding a bulge on the edge of the pole cover plate to enhance sealing (see figure 4).
(2) And (4) assembling the battery according to a rolling groove process, and sealing the battery in a pier sealing mode. The shell opening is ensured to be pressed below the sealing ring coated outside the pole, and the shell opening and the pole are separated by the sealing ring (see figure 5: a steel shell 1, a sealing ring 2, a positive pole 3, a positive current collecting disc 4, a pole group 5 and a negative current collecting disc 6).
Claims (10)
1. A method for improving the functional performance of a cylindrical lithium ion battery is characterized by comprising the following steps:
firstly, preparing a steel shell with a gradually thinned shell opening, wherein the thickness of the shell is 0.4-0.6mm, and the thickness of the shell opening is 0.2-0.3mm;
then preparing a top cover integrating the pole and a sealing ring, wherein the outer side of the sealing ring comprises a sealing rib structure;
and finally, sealing by adopting an assembly process known in the industry and a rolling groove sealing mode and sealing by adopting a pier sealing mode.
2. The method for improving the functional performance of the cylindrical lithium ion battery according to claim 1, wherein the top cover integrating the pole and the sealing ring is realized by injection molding.
3. The method for improving the power performance of the cylindrical lithium ion battery according to claim 2, wherein the injection-molded sealing ring is made of elastic sealing rubber, PP or PBT.
4. The method for improving the power performance of the cylindrical lithium ion battery according to claim 1, wherein the gradually thinned steel shell is gradually thinned from a position 10-30mm away from the top end opening to the top end opening of the shell opening.
5. The method for improving the power performance of the cylindrical lithium ion battery as claimed in claim 1, wherein the bottom of the gradually thinned steel shell is provided with an explosion-proof valve.
6. The method for improving the functional performance of the cylindrical lithium ion battery according to claim 1, wherein the top cover integrating the electrode posts and the sealing ring is provided with the sealing ring, the sealing ring annularly wraps the top cover, the lower surface of the sealing ring is exposed out of the welding area of the current collecting plate, and the upper surface of the sealing ring is exposed out of the external electrode posts; the thickness of the top cover is 0.1-0.3mm.
7. The method for improving the power performance of the cylindrical lithium ion battery according to claim 1, wherein the upper part of the sealing ring wraps the side surface of the external pole, and the section of the sealing rib on the outer side of the sealing ring is in a trapezoidal structure or a semicircular structure.
8. The method for improving the power performance of the cylindrical lithium ion battery according to claim 1, wherein the height of the sealing rib of the sealing ring is 10% -30% of the thickness of the corresponding sealing ring; the distance between the sealing rib on the sealing ring and the outermost ring of the sealing ring is 0.5-1.5mm.
9. The method for improving the power performance of the cylindrical lithium ion battery as claimed in claim 1, wherein the depth of the rolling groove is greater than the position of the sealing rib of the sealing ring when the rolling groove seal is sealed.
10. The method for improving the functional performance of the cylindrical lithium ion battery according to claim 1, wherein after sealing, the opening of the shell is pressed below the sealing ring coated outside the pole, so as to ensure that the opening of the shell and the pole are separated by the sealing ring; after sealing, the upper steel shell of the sealing ring is in a horizontal state; and after sealing, the sealing rib of the sealing ring is flattened and is flush with the edge sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619281.3A CN115360462A (en) | 2022-06-02 | 2022-06-02 | Method for improving power performance of cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619281.3A CN115360462A (en) | 2022-06-02 | 2022-06-02 | Method for improving power performance of cylindrical lithium ion battery |
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| CN115360462A true CN115360462A (en) | 2022-11-18 |
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| CN202210619281.3A Pending CN115360462A (en) | 2022-06-02 | 2022-06-02 | Method for improving power performance of cylindrical lithium ion battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201397838Y (en) * | 2009-03-26 | 2010-02-03 | 天津力神电池股份有限公司 | Pole sealing structure for high-capacity lithium ion power battery |
| CN101752602A (en) * | 2009-12-18 | 2010-06-23 | 深圳市倍特力电池有限公司 | Manufacturing method of cylindrical battery |
| CN108886114A (en) * | 2016-05-27 | 2018-11-23 | 松下知识产权经营株式会社 | Enclosed-type battery and battery case |
| CN213026309U (en) * | 2020-07-10 | 2021-04-20 | 宁德时代新能源科技股份有限公司 | Battery box, battery, electric device and device for preparing battery |
| CN215578757U (en) * | 2021-08-23 | 2022-01-18 | 惠州市思洋科技有限公司 | Packaging structure for miniature cylindrical lithium battery |
-
2022
- 2022-06-02 CN CN202210619281.3A patent/CN115360462A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201397838Y (en) * | 2009-03-26 | 2010-02-03 | 天津力神电池股份有限公司 | Pole sealing structure for high-capacity lithium ion power battery |
| CN101752602A (en) * | 2009-12-18 | 2010-06-23 | 深圳市倍特力电池有限公司 | Manufacturing method of cylindrical battery |
| CN108886114A (en) * | 2016-05-27 | 2018-11-23 | 松下知识产权经营株式会社 | Enclosed-type battery and battery case |
| CN213026309U (en) * | 2020-07-10 | 2021-04-20 | 宁德时代新能源科技股份有限公司 | Battery box, battery, electric device and device for preparing battery |
| CN215578757U (en) * | 2021-08-23 | 2022-01-18 | 惠州市思洋科技有限公司 | Packaging structure for miniature cylindrical lithium battery |
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