CN101364638A - Diaphragm separating method for two-side current collecting core of square accumulator - Google Patents
Diaphragm separating method for two-side current collecting core of square accumulator Download PDFInfo
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- CN101364638A CN101364638A CNA2008100320061A CN200810032006A CN101364638A CN 101364638 A CN101364638 A CN 101364638A CN A2008100320061 A CNA2008100320061 A CN A2008100320061A CN 200810032006 A CN200810032006 A CN 200810032006A CN 101364638 A CN101364638 A CN 101364638A
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- pole plate
- mode separation
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- polar moment
- separation strapping
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- 238000000034 method Methods 0.000 title claims description 11
- 239000011149 active material Substances 0.000 claims abstract description 21
- 230000004888 barrier function Effects 0.000 claims description 42
- 238000000926 separation method Methods 0.000 claims description 34
- 238000009955 starching Methods 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000002002 slurry Substances 0.000 abstract description 5
- 238000010924 continuous production Methods 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 16
- 238000003475 lamination Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides an isolating mode using inner-core diaphragms for two-side current-collection of a prismatic cell, that is, the regions filled with slurry made of active materials in a positive plate and a negative plate of the inner core of the prismatic cell which adopts the two-side current collection are isolated by strip-shaped integral diaphragms according to certain specifications in a folding diaphragm isolating mode. The isolating mode improves the complicated mode which separately encapsulates a certain type of pole plates by diaphragm bags and is required in the conventional isolating mode using the diaphragms of the prismatic cell, improves the utilization rate of the diaphragms, greatly reduces the probability of short circuit of the positive and the negative electrodes and improves the reliability of the production. The isolating mode has the advantages of simple and rapid technology and low production cost, and the technology of the diaphragm-isolating mode can reduce the production cost of the prismatic cell and suit the large-scale continuous production.
Description
Technical field
The present invention relates to the isolation technology of accumulator diaphragm, the barrier film isolation method of particularly square power accumulator two-side current collecting core belongs to field of batteries.
Background technology
Along with the rise of electric automobile, electric tool etc., requirements at the higher level have been proposed all for the quality and the quantity of storage battery.The performance of secondary cell largely depends on the interior core performance and the structure of battery, and the battery inner core is made up of four parts such as positive pole, negative pole, barrier film and electrolyte usually.The main effect of battery inner core barrier film is isolation battery plus-negative plate plate, prevents the positive/negative plate electrical short, soaks into electrolyte, the approach of the ion transfer between both positive and negative polarity is provided, and plays imbibition and protects the liquid function.
Prismatic cell more and more is subjected to people's welcome in electronic market, and in prismatic cell, positive/negative plate is rectangle and adopts the mode assembled battery core of lamination, separates with barrier film between the positive and negative pole plate.In traditional prismatic cell, the lug of the positive and negative pole plate of battery all is positioned at the upper end of battery inner core, and there are following two main defectives in such structure: the first, and the positive and negative electrode lug is distributed in the upside of battery inner core, is easy to cause internal short-circuit; The second, the uniformity polarization when this kind structure is unfavorable for very that the rectangle plane pole plate discharges and recharges, especially under the condition of high current charge-discharge, its inhomogeneous polarization meeting is more serious.In order to overcome the problems referred to above and some other unfavorable factor, one of development person of the present invention is at the patent (publication number: just proposing CN1750310A) of " a kind of prismatic cell of making of the plate electrode lamination ", the lug of negative plates concentrates on the battery core arrangement of the relative both sides of battery inner core respectively, this structure is guaranteeing to can be good at overcoming when the both sides lug has enough electron conduction abilities the pole plate uneven phenomenon that polarizes everywhere, because the lug of opposed polarity lays respectively at the both sides of battery inner core, can there be the short circuit phenomenon between the both positive and negative polarity lug simultaneously.Obviously, the key of the core arrangement of this two-side current collecting is that the conductive capability at lug place needs enough by force, generally the lug of both sides need converge in a longitudinal direction to improve the electron conduction ability, and, the real position overlapped of positive and negative pole plate is only for being filled with the zone of active material slurry, so how battery diaphragm is isolated positive and negative electrode and seem particularly important in this structure battery, easy, quick, reliable barrier film is sealed the production efficiency that mode not only can improve battery, and can improve quality, the stability of battery, reduce the production cost of battery.
Traditional prismatic cell inner core barrier film isolation technology has two kinds: the first, anode plate is packed in the diaphragm bag made from battery diaphragm material, and will have the anode plate of diaphragm bag and negative plates then and replace lamination and make battery; The second, between each sheet positive and negative electrode, less times greater than the barrier film of pole plate size positive and negative pole plate is isolated being assembled into battery with size.In a kind of isolation technology in back, its stability obviously is difficult to control, is easy to occur the phenomenon because of the dislocation generation positive and negative electrode short circuit of pole plate, is not therefore adopted in high-end motive-power battery.According to traditional prismatic cell core arrangement, its barrier film isolation technology mainly adopts top first method.Yet, if adopt the prismatic cell core arrangement of the described two-side current collecting of above-mentioned patent, there is the following defective in this traditional barrier film isolation method: the pole plate that the technology of employing diaphragm bag is sealed the side afflux is about to whole pole plate and lug and seals or only seal the zone of filling active material slurry from bottom to top nothing more than dual mode; If pole piece and lug all sealed not only wastes barrier film, and is unfavorable for sealing septate pole plate lug group in distolateral converging; If adopt the mode of only sealing the zone of filling active material slurry, then do not have a large amount of wastes of barrier film and can solve seal septate pole plate the lug group in the distolateral problem that converges, but owing to generally only seal a kind of pole plate of polarity, and the pole plate of another opposite polarity does not need to seal barrier film, the pole plate that then is easy to take place not seal barrier film when lamination contacts and the phenomenon that is short-circuited with the lug of the pole plate of sealing barrier film away from a side of lug, thereby this method poor reliability.
By last surface analysis as can be known, in the prismatic cell of two-side current collecting core, the problem that traditional barrier film isolation method exists some to be difficult to remedy.Therefore the mode of seeking new, more simple and reliable, more economic barrier film isolation positive/negative plate seems extremely important to adapt to new core arrangement.
Summary of the invention
The technical problem to be solved in the present invention is, defective at the existing barrier film isolation technology existence of prismatic cell two-side current collecting lamination inner core above-mentioned, a kind of diaphragm separating method of two-side current collecting core of square accumulator is proposed, it adopts continuously folded barrier film isolation method, adopt a whole piece rectangle mode separation strapping folding back and forth just for a prismatic cell core with battery, the part that negative plate is filled with active material separates, and just reserving respectively in both sides, negative lug is so that realize same polarity lug confluxing at side easily, thereby not only can significantly reduce a large amount of reduction work of barrier film, reduce the unnecessary waste of barrier film, can also improve the reliability of battery and the operability of confluxing simultaneously, the serialization steady production in enormous quantities that helps battery.
Technical solution of the present invention is the diaphragm separating method of described two-side current collecting core of square accumulator, enforcement according to the following steps:
A. according to battery design, calculate a needed total diaphragm area of monomer rectangular cell, calculate a total length and a width numerical value that is used for the rectangle mode separation strapping of a battery according to the height of pole plate again;
B. total length and the width numerical value cutting barrier film that obtains according to aforementioned calculation obtains a complete rectangle mode separation strapping 4 that is used for a battery, and the width of this rectangle mode separation strapping 4 is greater than the height of pole plate;
C. as Fig. 2, described mode separation strapping 4 is lain on the operating table surface, put a slice A polar moment shape pole plate 3 at an end of this mode separation strapping 4, the lug 1 of this A polar moment shape pole plate 3 is positioned at the outside, mode separation strapping 4 ends, and makes mode separation strapping 4 exceed this A polar moment shape pole plate 3 upper/lower terminals;
D. as Fig. 3, with the described mode separation strapping 4 folding upper surfaces that cover described A polar moment shape pole plate 3, a slice B polar moment shape pole plate 6 is placed on the mode separation strapping 4 after folding, the lug 2 of this B polar moment shape pole plate 6 is symmetrically located at the relative opposite side of the lug 1 of described A polar moment shape pole plate 3 again; And the active material starching part of upper and lower two rectangle pole plates of being placed is overlapped fully;
The described A utmost point is meant a kind of in the negative or positive electrode; The B utmost point is meant the polarity extremely opposite with A, i.e. negative pole or positive pole;
F. again with the described mode separation strapping 4 folding upper surfaces that cover described B polar moment shape pole plate 6; Another sheet A polar moment shape pole plate 3 is placed on above the mode separation strapping 4, the lug of the A polar moment shape pole plate among the lug of this rectangle pole plate and the step C is positioned at the same side again, and this rectangle pole plate is overlapped fully with the active material starching part of a following rectangle pole plate;
G. with the mode separation strapping 4 folding upper surfaces that cover described another sheet A polar moment shape pole plate 3; Another sheet B polar moment shape pole plate 6 is placed on above the mode separation strapping 4, the lug of the lug of this rectangle pole plate and the B polar moment shape pole plate in the steps d is positioned at the same side again, and this rectangle pole plate is overlapped fully with the active material starching part of a following rectangle pole plate;
H. repeat above-mentioned steps f, step g successively;
I. many repeating step h, until the collector that needing to obtain respectively at the battery inner core of both sides.
Below the present invention is made further instructions.
Fig. 1 is the theory structure schematic diagram of released state for each pole plate of prismatic cell inner core, positive and negative pole plate alternate (replacing) is arranged, the positive and negative electrode collector lays respectively at the relative both sides of inner core, and the lap position of positive and negative pole plate is the zone that is coated with active material slurry.During battery discharge, the electric current of active material reaction converges in the both sides lug and flows to external circuit.
In the present invention, the pole plate by back and forth folding barrier film isolation battery inner core obtains sectional view as shown in Figure 3; In this core arrangement, just, negative lug is distributed in the both sides of battery inner core respectively, barrier film will be filled the plate regions of active material and well be kept apart, the phenomenon that the pole plate of having avoided simultaneously a kind of polarity well is short-circuited away from the lug end of the pole plate of end of lug and another kind of polarity, and, in such barrier film isolation technology, the barrier film better controlled mutual dislocation phenomenon between the pole plate, be equivalent to play the effect of pole plate location, just make, the zone that negative pole is filled active material well overlaps, and the electric current uniformity of (especially heavy-current discharge) distributes when further improving battery discharge.
In the present invention, the lug 1 and 2 of both sides is not all isolated (shown in Figure 3) by barrier film, this has not only reduced the use amount of barrier film, carry out the battery of heavy-current discharge simultaneously for needs, can adopt the same polarity lug is welded on the enough good electrode of a conductivity simultaneously, realize effectively confluxing of lug group, to reduce the voltage drop on the lug, it is enough balanced to make that the one-level of electric current on lug distributes, thereby improves the characteristics of output power of battery.And this barrier film isolation technology operation is simple and easy, is easy to realize the production of serialization, automation.
As known from the above, the present invention is a kind of diaphragm separating method of two-side current collecting core of square accumulator, it adopts continuously folded barrier film isolation method, adopt a whole piece rectangle mode separation strapping folding back and forth just for a prismatic cell core with battery, the part that negative plate is filled with active material separates, and just reserving respectively in both sides, negative lug is so that realize same polarity lug confluxing at side easily, thereby a large amount of reduction work of barrier film have not only significantly been reduced, reduced the unnecessary waste of barrier film and improved the utilance of barrier film, just greatly reduced simultaneously, the possibility of negative pole short circuit and improved the reliability of battery and the operability of confluxing; It is easy fast, production cost is low, helps the serialization steady production in enormous quantities of battery.
Description of drawings
Fig. 1 is a two side ends afflux battery pole plates lamination schematic diagram (pole plate is a released state);
Fig. 2 is the diaphragm separating method schematic diagram of a kind of embodiment;
Fig. 3 is that barrier film of the present invention is isolated among Fig. 1 of battery inner core A-A to the cross section structure schematic diagram.
In the drawings:
1---the lug of the A utmost point (negative or positive electrode) rectangle pole plate,
2---the lug of the B utmost point (negative pole or positive pole) rectangle pole plate,
3---A polar moment shape pole plate, 4---the rectangle mode separation strapping,
5---barrier film fold line, 6-B polar moment shape pole plate.
Embodiment
Among the present invention, described diaphragm separating method is referring to shown in Figure 2.Rectangle (strip) mode separation strapping 4 that width is slightly larger than the pole plate height lies on the operating table surface, the pole plate that a slice has been welded lug 1 is placed on diaphragms, the zone that makes pole plate apply active material all is put in diaphragms, make the right-hand member of mode separation strapping slightly exceed the active material coating zone, the major part of lug 1 is not overlapping with barrier film; After pole plate places, with mode separation strapping along fold line 5 with the barrier film on the left side to right folding and cover pole plate, fold line 5 is consistent with the high order end of pole plate shown in Figure 2 usually; After mode separation strapping covers to right folding and with pole plate, it is opposite with above-mentioned pole plate oppositely to place a slice polarity on mode separation strapping, the pole plate of active material fill area consistent size, the lug of this pole plate is positioned at and the relative left end of above-mentioned pole plate lug, and the zone of two opposite polarity pole plate coating active materials is overlapping fully before and after making, along the right-hand member of this pole plate barrier film is placed and first pole plate that pole plate polarity is identical to left folding and in diaphragms then, and vertically go up overlapping fully with first pole plate, stacking pole plate so repeatedly, folding barrier film just can be met the battery inner core that needs, and realizes effective isolation of both positive and negative polarity.
The inventive method is adapted to all prismatic cells of taking the two-side current collecting core structure, and it does not need as traditional prismatic cell barrier film heat-sealable way every pole plate to be carried out barrier film and seals; Barrier film only will be filled the positive and negative pole plate of active material and effectively be isolated, and the lug of both sides same polarity is not isolated by barrier film.
Claims (1)
1. the diaphragm separating method of a two-side current collecting core of square accumulator is characterized in that, its step is:
A. according to battery design, calculate a needed total diaphragm area of monomer rectangular cell, calculate a total length and a width numerical value that is used for the rectangle mode separation strapping of a battery according to the height of pole plate again;
B. total length and the width numerical value cutting barrier film that obtains according to aforementioned calculation obtains a complete rectangle mode separation strapping (4) that is used for a battery, and the width of this rectangle mode separation strapping 4 is greater than the height of pole plate;
C. described mode separation strapping (4) is lain on the operating table surface, put a slice A polar moment shape pole plate (3) at an end of this mode separation strapping (4), the lug (1) of this A polar moment shape pole plate (3) is positioned at the outside, mode separation strapping (4) end, and makes mode separation strapping (4) exceed this A polar moment shape pole plate (3) upper/lower terminal;
D. with the described mode separation strapping 4 folding upper surfaces that cover described A polar moment shape pole plate (3), a slice B polar moment shape pole plate (6) is placed on the mode separation strapping (4) after folding, the lug (2) of this B polar moment shape pole plate (6) is symmetrically located at the relative opposite side of lug (1) with described A polar moment shape pole plate (3) again; And the active material starching part of upper and lower two rectangle pole plates of being placed is overlapped fully;
The described A utmost point is meant a kind of in the negative or positive electrode; The B utmost point is meant the polarity extremely opposite with A;
F. again with the folding upper surface that covers described B polar moment shape pole plate (6) of described mode separation strapping (4); Another sheet A polar moment shape pole plate (3) is placed on above the mode separation strapping (4), the lug of the A polar moment shape pole plate among the lug of this rectangle pole plate and the step C is positioned at the same side again, and this rectangle pole plate is overlapped fully with the active material starching part of a following rectangle pole plate;
G. with the folding upper surface that covers described another sheet A polar moment shape pole plate (3) of mode separation strapping (4); Another sheet B polar moment shape pole plate (6) is placed on above the mode separation strapping (4), the lug of the lug of this rectangle pole plate and the B polar moment shape pole plate in the steps d is positioned at the same side again, and this rectangle pole plate is overlapped fully with the active material starching part of a following rectangle pole plate;
H. repeat above-mentioned steps f, step g successively;
I. many repeating step h, until the collector that needing to obtain respectively at the battery inner core of both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100320061A CN101364638A (en) | 2008-08-06 | 2008-08-06 | Diaphragm separating method for two-side current collecting core of square accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100320061A CN101364638A (en) | 2008-08-06 | 2008-08-06 | Diaphragm separating method for two-side current collecting core of square accumulator |
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| Publication Number | Publication Date |
|---|---|
| CN101364638A true CN101364638A (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100320061A Pending CN101364638A (en) | 2008-08-06 | 2008-08-06 | Diaphragm separating method for two-side current collecting core of square accumulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094618A (en) * | 2012-12-19 | 2013-05-08 | 天津市捷威动力工业有限公司 | Bag-making type lithium ion battery and preparation method thereof |
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2008
- 2008-08-06 CN CNA2008100320061A patent/CN101364638A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094618A (en) * | 2012-12-19 | 2013-05-08 | 天津市捷威动力工业有限公司 | Bag-making type lithium ion battery and preparation method thereof |
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Open date: 20090211 |