CN110085797B - Polymer lithium ion battery connected tab and manufacturing and using methods thereof - Google Patents
Polymer lithium ion battery connected tab and manufacturing and using methods thereof Download PDFInfo
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- CN110085797B CN110085797B CN201910432769.3A CN201910432769A CN110085797B CN 110085797 B CN110085797 B CN 110085797B CN 201910432769 A CN201910432769 A CN 201910432769A CN 110085797 B CN110085797 B CN 110085797B
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- tab
- adhesive tape
- metal strip
- positioning groove
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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
- 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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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a polymer lithium ion battery conjoined tab, which comprises an anode metal belt and a cathode metal belt which are connected through a tab adhesive tape, wherein the tab adhesive tape consists of an upper tab adhesive tape and a lower tab adhesive tape which are overlapped and fused with each other; the invention discloses a preparation method of a connected tab, wherein a positioning groove is arranged on a frame of a clip, a lower tab adhesive tape, two metal strips and an upper tab adhesive tape are sequentially placed on the positioning groove, and then the connected tab is obtained through hot pressing; the invention discloses a using method of a connected tab, which is characterized in that a positive metal strip and a negative metal strip of the connected tab are welded after being aligned and overlapped with a positive welding position and a negative welding position of a bare cell. The integrated lug accurately fixes the center distance between the positive electrode and the negative electrode of the lug, and improves the precision of the sealing position of the lug; the preparation method is suitable for batch production; the use method improves the precision of the sealing position of the conjoined tab.
Description
Technical Field
The invention belongs to the technical field of polymer lithium ion batteries, and particularly relates to a polymer lithium ion battery conjoined tab and a manufacturing and using method thereof.
Background
The lithium ion battery has the advantages of high working voltage, high energy density, long cycle life, no environmental pollution and the like, and is widely applied to the fields of electric tools, model toys, portable electronic equipment, electric vehicles and the like. The core of the polymer lithium ion battery consists of positive and negative electrodes, electrolyte, a diaphragm, a composite membrane and a lug. The positive and negative electrodes are separated by the diaphragm layer and assembled into a naked electric core in a winding or stacking mode. The positive and negative electrode tab parts are respectively welded on the foil regions of the bare cell pole pieces, the middle part and the composite film are used for sealing the top of the battery, and the outside is used for being connected with an electric appliance. Because utmost point ear in proper order with naked electric core counterpoint welding, the undulant and the undulant homoenergetic of naked electric core welding position of welding position can accumulate to utmost point ear middle part and outside. The fluctuation of the sealing position of the pole ear is large.
The polymer lithium ion battery tab is usually made of strip aluminum, copper or copper-nickel material, and is compounded with tab glue to form a vertical cross structure. In the battery manufacturing process, the positive and negative electrode lugs are welded with the positive and negative electrode current collectors of the bare cell in sequence through welding tools. The precision of the tab sealing position is mainly guaranteed by a welding tool and is represented by the center distance between two tabs. Because the pole lugs are separately separated and welded twice, the fluctuation of the center distance of the pole lugs in the industry at the present stage is generally larger and is not less than +/-0.5 mm.
The polymer lithium ion battery is sealed in a metal hot plate packaging mode, and grooving is carried out at a fixed position of a hot plate. The slotting position of the hot plate needs to correspond to the sealing position of the pole lug in the packaging process. If the fluctuation of the center distance of the lugs after welding is too large, the problem that the positions of the hot plate groove and the lugs do not correspond to each other can be caused, and liquid leakage and bad sealing products are generated.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a polymer lithium ion battery conjoined tab aiming at the defects of the prior art. The integral lug adopts a positive and negative electrode integral structure, the center distance between the positive electrode and the negative electrode of the lug is accurately fixed by fixing the center distance between the positive electrode metal belt and the negative electrode metal belt, the control mode of the lug center distance is optimized from a passive mode to an intuitive active mode, the fluctuation of the lug center distance caused by respectively welding the positive electrode and the negative electrode of the lug with a tool is avoided, and the precision of the lug sealing position is improved.
In order to solve the technical problems, the invention adopts the technical scheme that: the polymer lithium ion battery conjoined tab is characterized by comprising an anode metal belt and a cathode metal belt, wherein the anode metal belt (and the cathode metal belt are connected through a tab adhesive tape, the tab adhesive tape consists of an upper tab adhesive tape and a lower tab adhesive tape which are overlapped and fused with each other, and the anode metal belt and the cathode metal belt are fixed between the upper tab adhesive tape and the lower tab adhesive tape through hot melting.
The conjoined tab adopts a positive and negative electrode conjoined structure, the positions of the positive metal belt and the negative metal belt of the conjoined tab are fixed by the tab adhesive tape consisting of the upper tab adhesive tape and the lower tab adhesive tape which are overlapped and fused with each other, the center distance between the positive electrode and the negative electrode of the conjoined tab is accurately fixed by fixing the center distance between the positive metal belt and the negative metal belt of the electrode tab, the fluctuation of the center distance between the electrode tabs caused by respectively welding the positive electrode and the negative electrode of the electrode tab with a tool is avoided, the precision of the sealing position of the electrode tab is improved, the yield of a polymer lithium ion battery is improved, one-time packaging of a special-shaped electrode tab is realized, and the range of the conjoined tab is expanded.
The polymer lithium ion battery conjoined tab is characterized in that the positive metal belt and the negative metal belt are not directly contacted and are only connected through a tab adhesive tape. The positive metal belt and the negative metal belt are not in direct contact and are only connected through the tab adhesive tape, so that the normal use of the connected tab is ensured, the center distance between the positive electrode and the negative electrode of the tab is accurately determined, and the method is simple, convenient and safe.
The polymer lithium ion battery conjoined tab is characterized in that an included angle formed between the positive metal belt and the negative metal belt is 0-30 degrees. The included angle range avoids direct contact between the positive metal belt and the negative metal belt, and is an effective range of practical application of the connected tab.
The polymer lithium ion battery conjoined tab is characterized in that the included angle between the positive metal strip and the tab adhesive tape and the included angle between the negative metal strip and the tab adhesive tape are both 60-120 degrees. The included angle range is an effective range of practical application of the connected tab, the application of the special-shaped tab is favorably realized, and the application range of the connected tab is expanded.
The polymer lithium ion battery conjoined tab is characterized in that the distance between the central point of the crossing position of the positive metal strip and the tab adhesive tape and the central point of the crossing position of the negative metal strip and the tab adhesive tape is the center distance of a battery cell. From the manufacturing perspective of the polymer lithium ion battery, the distance between the central point of the intersection position of the positive metal strip and the tab adhesive tape and the central point of the intersection position of the negative metal strip and the tab adhesive tape is determined as the center distance of the battery cell, so that the center distance of the connected tab is fixed to be matched with the center distance of the battery cell, the welding positions of the positive metal strip, the negative metal strip and the battery cell in the connected tab are favorably and accurately determined, and the precision of the sealing position of the connected tab is improved.
In addition, the invention also provides a preparation method of the polymer lithium ion battery conjoined tab, which is characterized by comprising the following steps:
step one, respectively arranging a positive metal strip positioning groove and a negative metal strip positioning groove on one group of parallel frames in a clip, and arranging a tab adhesive tape positioning groove on the other group of parallel frames in a square connected tab mold frame to obtain a connected tab mold; an included angle formed between the positive metal strip positioning groove and the negative metal strip positioning groove is equal to an included angle formed between the positive metal strip and the negative metal strip, an included angle formed between the positive metal strip positioning groove and the lug adhesive tape positioning groove is equal to an included angle between the positive metal strip and the lug adhesive tape, and an included angle formed between the negative metal strip positioning groove and the lug adhesive tape positioning groove is equal to an included angle between the negative metal strip and the lug adhesive tape;
step two, placing the connected tab die obtained in the step one in a hot press, placing a lower tab adhesive tape in a tab adhesive tape positioning groove of a connected tab die frame, then respectively placing an anode metal belt in a positive metal belt positioning groove, placing a cathode metal belt in a cathode metal belt positioning groove, and then placing an upper tab adhesive tape in the tab adhesive tape positioning groove and covering the anode metal belt and the cathode metal belt;
and step three, closing the upper plate and the lower plate of the hot press through the hollow position of the connected tab die, and fusing an upper tab adhesive tape and a lower tab adhesive tape in the connected tab die by heating so as to be adhered and fixed with the positive metal strip and the negative metal strip to obtain the polymer lithium ion battery connected tab.
The invention adopts a hot-pressing method to prepare the conjoined tab, firstly modifies a return clamp to manufacture a conjoined tab mould, then sequentially puts all components of the conjoined tab into the conjoined tab mould for hot pressing, and transfers heat to the tab adhesive tape through the gap position of the positioning groove of the conjoined tab mould, so that the upper tab adhesive tape and the lower tab adhesive tape except the upper tab adhesive tape and the lower tab adhesive tape which are positioned in the frame of the conjoined tab mould are heated and fused, thereby being adhered and fixed with the positive metal belt and the negative metal belt, and obtaining the conjoined tab of the polymer lithium ion battery. The preparation method of the invention designs and manufactures the connected tab mould according to the structure of the connected tab, thereby completing the control and the shaping of the center distance between the anode and the cathode of the tab in the manufacturing process of the connected tab, eliminating the error accumulation effect of the center distance of the tab, greatly improving the precision of the center distance between the anode and the cathode of the tab, simplifying the positioning mode in the welding process of the tab and a naked electric core and reducing the difficulty of welding and positioning; in addition, different connected tab molds can be designed according to different structures of the connected tabs, so that the method is flexible and convenient, is suitable for batch production of the connected tabs, and has high popularization value.
In addition, the invention also provides a use method of the polymer lithium ion battery conjoined tab, which is characterized by comprising the following steps:
aligning the lower end of a positive metal band in a polymer lithium ion battery connected lug with a positive welding position of a naked battery cell to form a positive overlapping area, and aligning the lower end of a negative metal band with a negative welding position of the naked battery cell to form a negative overlapping area;
and step two, welding the positive electrode overlapping region and the negative electrode overlapping region formed in the step one at the same time.
The center distance between the anode and the cathode of the connected lug is fixed, when the integrated lug is used, only the lower end of the anode metal belt and the lower end of the cathode metal belt in the connected lug are respectively aligned and overlapped with the anode welding position and the cathode welding position of a naked battery cell and then are simultaneously welded, the alignment is convenient, simple and feasible, errors caused by the fluctuation of the welding positions of the anode, the cathode and the naked battery cell of the lug are avoided, the precision of the sealing position of the lug is further improved, the problem that a hot plate groove position does not correspond to the position of the lug in the lug packaging process is avoided, and the liquid leakage phenomenon and the occurrence of bad products of a polymer lithium ion battery are avoided.
Compared with the prior art, the invention has the following advantages:
1. the conjoined tab adopts a positive and negative electrode conjoined structure, the center distance between the positive electrode and the negative electrode of the tab is accurately fixed by fixing the center distance between the positive electrode metal belt and the negative electrode metal belt, the control mode of the tab center distance is optimized from a passive mode to an intuitive active mode, the fluctuation of the tab center distance caused by respectively welding the positive electrode and the negative electrode of the tab with a tool is avoided, and the precision of the tab sealing position is improved.
2. The integral lug mold is designed and manufactured according to the structure of the integral lug, so that the control and the shaping of the center distance between the anode and the cathode of the lug can be finished in the manufacturing process of the integral lug, compared with the traditional center distance control mode, the accumulated effect of the center distance error of the lug is eliminated, the precision of the center distance between the anode and the cathode of the lug is greatly improved, and the center distance between the anode and the cathode of the integral lug can be controlled within +/-0.3 mm.
3. According to the invention, the connected tab mold is provided with the positive metal strip positioning groove and the negative metal strip positioning groove corresponding to the tab adhesive tape positioning groove and the connected tab, so that the structure of the connected tab is controlled, different connected tab molds can be designed according to different structures of the connected tab, and the connected tab mold is simple, feasible, flexible and convenient, is suitable for batch production of the connected tab and is suitable for popularization.
4. The preparation method simplifies the positioning mode in the welding process of the tab and the bare cell, and reduces the difficulty of subsequent welding positioning.
5. The integrated lug and the naked cell are aligned and then welded simultaneously, so that errors caused by welding position fluctuation of the anode and cathode of the lug and the naked cell are avoided, the precision of the lug sealing position is further improved, the problem that a hot plate groove position does not correspond to the lug position in the lug packaging process is avoided, and the liquid leakage phenomenon and the occurrence of bad products of the polymer lithium ion battery are avoided.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural view of the conjoined tab of the present invention.
Fig. 2 is a schematic structural view of the connected tab die of the invention.
Fig. 3 is a schematic diagram of alignment between the conjoined tab and the bare cell in the invention.
Description of reference numerals:
1-positive metal strip; 2-a negative metal band; 3, mounting a tab adhesive tape;
4-lower tab adhesive tape; 5-positioning a positive metal belt groove; 6-negative metal strap locating slot;
7-positioning of tab adhesive tape slots; 8-naked electric core; 8-1-positive electrode welding position;
8-2-negative electrode welding position.
Detailed Description
Example 1
As shown in fig. 1, the polymer lithium ion battery conjoined tab of the embodiment includes a positive metal strip 1 and a negative metal strip 2, the positive metal strip 1 and the negative metal strip 2 are connected by a tab tape, the included angle formed between the positive metal strip 1 and the negative metal strip 2 is 0-30 degrees, the positive metal strip 1 and the negative metal strip 2 are not directly contacted and are only connected through a tab adhesive tape, the included angle between the positive metal belt 1 and the lug adhesive tape and the included angle between the negative metal belt 2 and the lug adhesive tape are both 60-120 degrees, the distance between the central point of the crossing position of the positive metal strap 1 and the tab adhesive tape and the central point of the crossing position of the negative metal strap 2 and the tab adhesive tape is the central distance of the battery cell, the tab adhesive tape consists of an upper tab adhesive tape 3 and a lower tab adhesive tape 4 which are overlapped and fused with each other, the positive electrode metal belt 1 and the negative electrode metal belt 2 are fixed between an upper tab adhesive tape 3 and a lower tab adhesive tape 4 through hot melting.
Example 2
The preparation method of the polymer lithium ion battery conjoined tab of the embodiment comprises the following steps:
step one, respectively arranging a positive metal strip positioning groove 5 and a negative metal strip positioning groove 6 on one group of parallel frames in a clip, and arranging a tab adhesive tape positioning groove 7 on the other group of parallel frames in a square connected tab mold frame to obtain a connected tab mold, as shown in fig. 2; an included angle formed between the positive metal strip positioning groove 5 and the negative metal strip positioning groove 6 is 0-30 degrees, and an included angle formed between the positive metal strip positioning groove 5 and the tab tape positioning groove 7 and an included angle formed between the negative metal strip positioning groove 6 and the tab tape positioning groove 7 are both 60-120 degrees;
step two, placing the connected tab die obtained in the step one in a hot press, placing a lower tab adhesive tape 4 in a tab adhesive tape positioning groove 7 of a connected tab die frame, then respectively placing an anode metal belt 1 in an anode metal belt positioning groove 5, placing a cathode metal belt 2 in a cathode metal belt positioning groove 6, and then placing an upper tab adhesive tape 3 in the tab adhesive tape positioning groove 7 and covering the anode metal belt 1 and the cathode metal belt 2;
and step three, closing the upper plate and the lower plate of the hot press through the hollow position of the connected lug mold, and fusing an upper lug adhesive tape 3 and a lower lug adhesive tape 4 in the connected lug mold by heating so as to be adhered and fixed with the positive metal strip 1 and the negative metal strip 2 to obtain the polymer lithium ion battery connected lug.
Example 3
The use method of the connected tab in the polymer lithium ion battery comprises the following steps:
step one, aligning a lower end 1-1 of a positive metal strap 1 in a polymer lithium ion battery connected lug with a positive welding position 8-1 of a naked battery cell 8 to form a positive overlapping area, and aligning a lower end 2-1 of a negative metal strap 2 with a negative welding position 8-2 of the naked battery cell 8 to form a negative overlapping area, as shown in fig. 3;
and step two, welding the positive electrode overlapping region and the negative electrode overlapping region formed in the step one at the same time.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (3)
1. The utility model provides a polymer lithium ion battery disjunctor utmost point ear, its characterized in that includes anodal strap (1) and negative pole strap (2), connects through utmost point ear sticky tape between anodal strap (1) and negative pole strap (2), utmost point ear sticky tape is overlapped mutually and is fused last utmost point ear sticky tape (3) and is constituteed down utmost point ear sticky tape (4), anodal strap (1) and negative pole strap (2) are all fixed between last utmost point ear sticky tape (3) and lower utmost point ear sticky tape (4) through the hot melt, direct contact is not directly passed through between anodal strap (1) and negative pole strap (2), only connect through utmost point ear sticky tape, the contained angle that forms between anodal strap (1) and negative pole strap (2) is greater than 0 and is no longer than 30 and is connected°The included angle between the positive metal belt (1) and the tab adhesive tape and the included angle between the negative metal belt (2) and the tab adhesive tape are both 60 degrees°～120°And does not contain 90°And the distance between the central point of the crossing position of the positive metal belt (1) and the lug adhesive tape and the central point of the crossing position of the negative metal belt (2) and the lug adhesive tape is the central distance of the battery cell.
2. A method for preparing the polymer lithium ion battery conjoined tab of claim 1, which is characterized by comprising the following steps:
step one, respectively arranging a positive metal strip positioning groove (5) and a negative metal strip positioning groove (6) on one group of parallel frames in a clip, and arranging a tab adhesive tape positioning groove (7) on the other group of parallel frames in a square connected tab mold frame to obtain a connected tab mold; an included angle formed between the positive metal strip positioning groove (5) and the negative metal strip positioning groove (6) is equal to an included angle formed between the positive metal strip (1) and the negative metal strip (2), an included angle formed between the positive metal strip positioning groove (5) and the tab tape positioning groove (7) is equal to an included angle between the positive metal strip (1) and the tab tape, and an included angle formed between the negative metal strip positioning groove (6) and the tab tape positioning groove (7) is equal to an included angle between the negative metal strip (2) and the tab tape;
step two, placing the connected tab die obtained in the step one in a hot press, placing a lower tab adhesive tape (4) in a tab adhesive tape positioning groove (7) of a connected tab die frame, then respectively placing an anode metal strip (1) in an anode metal strip positioning groove (5), placing a cathode metal strip (2) in a cathode metal strip positioning groove (6), and then placing an upper tab adhesive tape (3) in the tab adhesive tape positioning groove (7) and covering the anode metal strip (1) and the cathode metal strip (2);
and step three, closing the upper plate and the lower plate of the hot press through the hollow position of the connected lug mold, and heating and fusing the upper lug adhesive tape (3) and the lower lug adhesive tape (4) in the connected lug mold so as to be adhered and fixed with the positive metal strip (1) and the negative metal strip (2) to obtain the polymer lithium ion battery connected lug.
3. The use method of the polymer lithium ion battery conjoined tab according to claim 1, characterized in that the method comprises the following steps:
the method comprises the steps that firstly, the lower end (1-1) of an anode metal belt (1) in a polymer lithium ion battery connected lug is aligned with an anode welding position (8-1) of a naked battery cell (8) to form an anode overlapping area, and the lower end (2-1) of a cathode metal belt (2) is aligned with a cathode welding position (8-2) of the naked battery cell (8) to form a cathode overlapping area;
and step two, welding the positive electrode overlapping region and the negative electrode overlapping region formed in the step one at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910432769.3A CN110085797B (en) | 2019-05-23 | 2019-05-23 | Polymer lithium ion battery connected tab and manufacturing and using methods thereof |
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| CN201910432769.3A CN110085797B (en) | 2019-05-23 | 2019-05-23 | Polymer lithium ion battery connected tab and manufacturing and using methods thereof |
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| CN110085797B true CN110085797B (en) | 2022-04-19 |
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Families Citing this family (2)
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| CN111509282B (en) * | 2020-03-25 | 2022-06-07 | 惠州亿纬创能电池有限公司 | Battery, battery core and top sealing process thereof |
| CN112768785A (en) * | 2020-12-31 | 2021-05-07 | 惠州市惠德瑞锂电科技股份有限公司 | High-speed top sealing method for soft package lithium metal battery |
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| JP2010080325A (en) * | 2008-09-26 | 2010-04-08 | Asahi Kasei Corp | Nonaqueous lithium type storage element and method of manufacturing the same |
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