CN202495524U - Irregular lithium ion battery - Google Patents
Irregular lithium ion battery Download PDFInfo
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- CN202495524U CN202495524U CN2012200730000U CN201220073000U CN202495524U CN 202495524 U CN202495524 U CN 202495524U CN 2012200730000 U CN2012200730000 U CN 2012200730000U CN 201220073000 U CN201220073000 U CN 201220073000U CN 202495524 U CN202495524 U CN 202495524U
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- lithium ion
- punching
- ion battery
- negative plate
- positive plate
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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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Abstract
The utility model belongs to the technical field of lithium ion batteries and particularly relates to an irregular lithium ion battery which comprises a positive plate, a negative plate, a membrane and a packaging film, wherein a positive plate punched hole is arranged on the positive plate, a negative plate punched hole is arranged on the negative plate, and a membrane punched hole is arranged on the membrane. After the positive plate, the membrane and the negative plate are manufactured to be a cell through winding or laminating process, the centers of the positive plate punched hole, the negative plate punched hole and the membrane punched hole are located on the same straight line to form a communicating notch. Compared with the prior art, a channel for electrolyte absorption is additionally arranged so that absorption for electrolyte by the pole plates is promoted, pole plate soaking in electrolyte is improved, and the cycling performance of the lithium ion battery is improved. Simultaneously, the irregular lithium ion battery further solves the problem that the traditional lithium ion battery cannot meet requirements of irregular electronic products for the power supply.
Description
Technical field
The utility model belongs to technical field of lithium ion, and specifically, the utility model relates to a kind of special-shaped lithium ion battery.
Background technology
Lithium ion battery has obtained at aspects such as mobile device (like MP3, mobile phone, notebook computer), electric automobile, military and space using widely owing to have energy density height, environmental protection and advantage such as have extended cycle life.
Along with the fast development of electronic technology, market competition also is growing more intense.The quality of electronic product is more and more lighter, and thickness is also more and more thinner, and this energy density to battery has proposed increasingly high requirement.In addition, because the raising of development of electronic technology and raw material production technology, the useful life of electronic product is also more and more longer, so also increasingly high for the requirement of the cycle life of lithium ion battery.Improve the useful life of lithium ion battery, not only can reduce the use cost of battery, also can reduce the scrappage of lithium ion battery simultaneously, can really accomplish environmental protection.
Be generally 300 and be recycled to 500 circulations the useful life of tradition lithium ion battery, and the function of use of current electronic product is more and more, and quickening causes in use discharging; Especially concerning current smart mobile phone and Notebook Battery; If the program of operation is more, filled once electricity at least in one day, like this; For traditional lithium ion battery, its corresponding electronic product useful life is the 1 year time to a year and a half basically.Improve terminal use's use cost so greatly, also be unfavorable for environmental protection simultaneously.
The principal element that influences lithium ion battery cycle life has: both positive and negative polarity active material kind, and electrolyte type and electrolyte uptake, working procedure parameter (like the compacted density size) discharges and recharges condition, lithium ion battery environment for use etc.When the both positive and negative polarity active material, discharge and recharge after condition and environment for use confirm, the factor that influences lithium ion battery cycle life mainly is the uptake of electrolyte.One of the factor that influences the electrolyte uptake is the electrolyte groundwater increment, and another one is the compacted density of positive/negative plate.The size of compacted density influences the porosity of pole piece, and then influences the absorption of pole piece to electrolyte.And lithium ion battery in use, because the reason of side reaction, electrolyte can be consumed in anodal and negative terminal surface; Cause the electrolyte content of inside lithium ion cell to reduce; Side reaction simultaneously makes the interface impedance of battery increase, so lithium ion battery cycle life can decay, particularly consumes the later stage at electrolyte; Impedance meeting increase is faster, and the cycle life decay is also accelerated.
Traditional lithium ion battery is to realize long circulation life through the compacted density that reduces both positive and negative polarity; The benefit of doing like this is to increase the porosity of pole piece through reducing compacted density; Increase the uptake of pole piece, guarantee that inside lithium ion cell has enough electrolyte to increase cycle life electrolyte content.But it is low excessively to work as the both positive and negative polarity compacted density; Then can cause in the intergranular contact variation, particularly lithium ion battery use the pole piece internal impact more to worsen between particle and contact, make that negative terminal surface is analysed lithium when charging; High rate performance variation during discharge, it is poorer to make that also the battery circulation becomes.And in actual production process, because the influence of equipment precision and technology controlling and process level is on the low side like coating weight; The equipment pressure of colding pressing diminishes, and possibly cause the compacted density of part pole piece on the low side, thereby causes battery circulation variation; Even cause battery to analyse lithium, and then influence cell safety.
In addition, in order to improve the electronic product competitiveness, the part consumption electronic product changes to heteromorphosis, and the profile of electronic product is also more and more diversified now.The bluetooth earphone of banana-shaped for example, circular MP3, circular mobile phone, the electronics watch of toroidal, the square electronic clock of embedded transparent circular electronic console etc.Mostly traditional lithium ion battery shape is cuboid or cylinder; Generally speaking; In order to satisfy the needs of special-shaped electronic product, when a traditionally shaped energy content of battery density can not satisfy the electronic product requirement, cell designer all can be according to the overall dimension of electronic product; The battery that designs corresponding size in the proper site of this electronic product carries out parallel connection, in the hope of satisfying the requirement that discharges and recharges of this shape product.And for this kind electronic product, the consequence of selecting a plurality of battery parallel waies for use is directly to cause electronic product inner space utilance seriously to descend, and has particularly increased the product grouping process, and this will cause the battery production cost to improve greatly.So be necessary to provide a kind of new lithium ion battery manufacture method to satisfy the demand of above-mentioned special shape battery.
In view of this, necessary a kind of special-shaped lithium ion battery with long circulation life is provided.
The utility model content
The purpose of the utility model is: to the deficiency of prior art, and a kind of special-shaped lithium ion battery with long circulation life is provided.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of special-shaped lithium ion battery; Comprise positive plate, negative plate, barrier film and encapsulating film, offer the positive plate punching on the described positive plate, offer the negative plate punching on the negative plate; Offer the barrier film punching on the barrier film; With positive plate, barrier film and negative plate through reeling or after lamination technology processed electric core, the center of positive plate punching, negative plate punching and barrier film punching was all dropped on same the straight line, forms the breach that is communicated with.
With respect to prior art; The special-shaped lithium ion battery of the utility model has promoted the absorption of pole piece to electrolyte because the existence of punching has increased the passage that electrolyte absorbs, and has improved the infiltration of electrolyte to pole piece; The internal resistance of battery obviously reduces, and has improved the cycle performance of lithium ion battery.
As a kind of improvement of the utility model abnormity lithium ion battery, said positive plate punching, negative plate punching and barrier film punching are opened in the central area or the marginal zone of electric core respectively.
As a kind of improvement of the utility model abnormity lithium ion battery, circular, square, the triangle or trapezoidal of being shaped as of said positive plate punching, negative plate punching and barrier film punching.
As a kind of improvement of the utility model abnormity lithium ion battery, said encapsulating film is provided with the encapsulating film punching, and the center of said encapsulating film punching and electric core punching is dropped on same the straight line.
A kind of improvement as the utility model abnormity lithium ion battery; The diameter of positive plate punching, negative plate punching, barrier film punching and encapsulating film punching or the length of side are more than or equal to 0.1 μ m; But be less than the width of pole piece, do not rupture and can normally reel to guarantee pole piece.
With respect to prior art, the utility model abnormity lithium ion battery has solved traditional lithium ion battery and can not satisfy the problem of special shape electronic product to the demand of power supply, and the position of particularly placing battery has protruding perhaps part to need the electronic product of hollow out.Adopt the lithium ion battery of the utility model, solved because electronic product profile irregular (like local crowning) and the problem of a plurality of batteries parallel connections of the needs that cause.Under the prerequisite that satisfies the electronic product capacity, the utility model has significantly reduced the production quantity of lithium ion battery, has improved the production efficiency of lithium ion battery.From the process efficiency angle; The utility model reduces number of batteries because substitute a plurality of batteries with a battery, has improved the efficient that packaging process, electrolyte pour into operation; Cancel the grouping operation of battery, improved formation device and volume test usage ratio of equipment.Adopt the cost of manufacture of the lithium ion battery of the utility model to reduce greatly thus, for the extensive use of lithium ion battery provides strong assurance.Simultaneously also strong condition is provided, can have satisfied the daily life needs of people more widely electronic product for the variation of electronic product shape.In addition, adopt the lithium ion battery of the utility model, because there are concave design or hollow out design in the part, this lithium ion battery matches with the electronic product profile to the depression or the hollow out position of correspondence, also can play the effect of self-contained battery.Place battery and perhaps rock, can play the not impaired effect of protection battery corner angle, reduce internal short-circuit appears in battery because of the corner is squeezed probability at the electronic product internal displacement.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, the utility model and useful technique effect thereof are carried out detailed explanation, wherein:
Fig. 1 is the special-shaped lithium ion battery sketch map of cylinder type hollow out in the middle of the utility model;
Fig. 2 is provided with the special-shaped lithium ion battery sketch map of rectangular indentation for the utility model limit;
Fig. 3 is provided with the special-shaped lithium ion battery sketch map of arc notch for the utility model angle;
Fig. 4 is the special-shaped lithium ion battery sketch map of the utility model local dent.
Embodiment
Embodiment 1
What at first need explain a bit is before the preparation, to calculate the used positive plate of lithium ion battery, negative plate and diaphragm size according to capacity requirement;
During punching, need require to carry out according to result of calculation and battery size die-cut, to punch out the punching size and dimension that needs.
Positive plate preparation: with LiCoO
2(cobalt acid lithium), superconduction carbon (Super-P), Kynoar (PVDF) add the middle mixing of N-methyl pyrrolidone (NMP) according to mass ratio and stir at 95.0: 2.5: 2.5; Obtain having the slurry of certain flowability; Then the gained slurry is coated in the two sides of the thick metal aluminum foil of 16um, is dried into pole piece with certain pliability.Cold pressing then, itemize, behind the itemize punching is carried out in corresponding electric each layer of core of pole piece position, obtain the positive plate punching, the hole be shaped as circle, bore dia is 15mm, will be connected on the aluminium foil with the positive pole ear that the thick aluminium flake of 0.4mm is processed and make positive plate.
Negative plate preparation: with graphite, superconduction carbon (Super-P), carboxymethyl cellulose (CMC), butadiene-styrene rubber (SBR) according to mass ratio according to mass ratio 95.5: 1.5:: add at 1.5: 1.5 and to mix in the deionized waters and stir; Obtain having the slurry of certain flowability; Again above-mentioned slurry is coated in the two sides of the thick metal copper foil of 12um, is dried into pole piece with certain flexibility.Cold pressing then, itemize (promptly to cut out, cut into the size of required size through negative plate); Carry out punching in corresponding electric each layer of core of pole piece position then; Obtain the negative plate punching, the hole be shaped as circle, bore dia is 13mm; After will being connected on the Copper Foil with the negative lug that the thick copper sheet of 0.4mm is processed again, make negative plate.
Barrier film preparation: barrier film can adopt polypropylene (PP)-polyethylene (PE)-three layers of laminated film of polypropylene PP, and punching is carried out in corresponding electric each layer of core position, obtains the barrier film punching, the hole be shaped as circle, bore dia is 10mm.
The encapsulating film preparation: encapsulating film adopts aluminum-plastic composite membrane, and its structure is nylon-aluminium foil-polypropylene from outside to inside.Up and down punching of encapsulating film obtains the encapsulating film punching, the hole be shaped as circle, bore dia is 7mm.
The center of the punching of above positive plate, negative plate, barrier film, encapsulating film all on same center line, with guarantee after encapsulation porose center overlap.
Process electric core to the positive plate of making, negative plate and barrier film through lamination or coiling, electric core is packed into carry out packaging process in the battery packages shell then, after the heat-seal, in battery, inject electrolyte, with lithium hexafluoro phosphate (LiPF
6) be lithium salts, the ethylene carbonate with 20%, 30% methyl ethyl carbonate and 50% dimethyl carbonate are solvent, and wherein, the concentration of lithium hexafluoro phosphate is 1M, and through changing into, technologies such as ageing make finished product electricity core again., as shown in Figure 1 in the middle of the lithium ion battery that makes for the cylinder type hollow out.
For this lithium ion battery that is provided with engraved structure, when encapsulating again; Except carrying out closedtop and side seal, the position of middle hollow out also will encapsulate.
Embodiment 2
Be with embodiment 1 difference, before coating, on plus plate current-collecting body and negative current collector, offer punching earlier; And then carry out follow-up coating, cold pressing and itemize operation; The punching of both positive and negative polarity, barrier film be shaped as rectangle, the length of rectangle is 10mm, wide is 5mm.Not punching of encapsulating film, other operations have rectangular indentation with embodiment 1 on the lithium-ion electric pool side that makes, and be as shown in Figure 2.
Embodiment 3
Be with embodiment 2 differences, type of the being shaped as arc of positive plate punching, negative plate punching, barrier film punching, not punching of encapsulating film, other operations have arc notch with embodiment 1 on the angle of the lithium ion battery that makes, and are as shown in Figure 3.
Embodiment 4
Be that with embodiment 1 difference the positive plate punching hole diameter is 1mm, the negative plate punching hole diameter is 0.5mm; Not punching of barrier film, not punching of encapsulating film, other operations are with embodiment 1; The lithium ion battery that makes has the structure of local dent, and is as shown in Figure 4.
Embodiment 5
Be that with embodiment 1 difference the punching on the encapsulating film is carried out die-cut obtaining after encapsulation, other operations are with embodiment 1.
Need to prove that except the listed shape of above-mentioned embodiment, the shape of punching can also be the figure of similar round, rectangle, triangle, closed arbitrarily or non-closure such as trapezoidal.
With respect to prior art, the utility model abnormity lithium ion battery has solved traditional lithium ion battery and can not satisfy the problem of special shape electronic product to the demand of power supply, and the position of particularly placing battery has protruding perhaps part to need the electronic product of hollow out.Adopt the lithium ion battery of the utility model, solved because electronic product profile irregular (like local crowning) and the problem of a plurality of batteries parallel connections of the needs that cause.Under the prerequisite that satisfies the electronic product capacity, the utility model has significantly reduced the production quantity of lithium ion battery, has improved the production efficiency of lithium ion battery.In addition, adopt the lithium ion battery of the utility model, because there are concave design or hollow out design in the part, this lithium ion battery matches with the electronic product profile to the depression or the hollow out position of correspondence, also can play the effect of self-contained battery.Place battery and perhaps rock, can play the not impaired effect of protection battery corner angle, reduce internal short-circuit appears in battery because of the corner is squeezed probability at the electronic product internal displacement.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, the utility model those skilled in the art can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the utility model is not limited to also should be in the protection range of the claim of the utility model to some equivalent modifications of the utility model and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the utility model is not constituted any restriction.
Claims (5)
1. special-shaped lithium ion battery; Comprise positive plate, negative plate, barrier film and encapsulating film, it is characterized in that: offer the positive plate punching on the described positive plate, offer the negative plate punching on the negative plate; Offer the barrier film punching on the barrier film; With positive plate, barrier film and negative plate through reeling or after lamination technology processed electric core, the center of positive plate punching, negative plate punching and barrier film punching was all dropped on same the straight line, forms the breach that is communicated with.
2. special-shaped lithium ion battery according to claim 1 is characterized in that: said positive plate punching, negative plate punching and barrier film punching are opened in the central area or the marginal zone of electric core respectively.
3. special-shaped lithium ion battery according to claim 1 is characterized in that: circular, square, the triangle or trapezoidal of being shaped as of said positive plate punching, negative plate punching and barrier film punching.
4. special-shaped lithium ion battery according to claim 1 is characterized in that: said encapsulating film is provided with the encapsulating film punching, and the center of said encapsulating film punching and electric core punching is dropped on same the straight line.
5. special-shaped lithium ion battery according to claim 4 is characterized in that: the diameter of positive plate punching, negative plate punching, barrier film punching and encapsulating film punching or the length of side are more than or equal to 0.1 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200730000U CN202495524U (en) | 2012-03-01 | 2012-03-01 | Irregular lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200730000U CN202495524U (en) | 2012-03-01 | 2012-03-01 | Irregular lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495524U true CN202495524U (en) | 2012-10-17 |
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ID=47001737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200730000U Expired - Lifetime CN202495524U (en) | 2012-03-01 | 2012-03-01 | Irregular lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202495524U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899600A (en) * | 2018-05-17 | 2018-11-27 | 中国电力科学研究院有限公司 | A kind of L-type lithium ion battery and its chemical synthesizing method |
| CN114335425A (en) * | 2022-01-12 | 2022-04-12 | 三一技术装备有限公司 | Pole piece, diaphragm, lamination, battery core manufacturing process and battery |
| WO2022205922A1 (en) * | 2021-03-30 | 2022-10-06 | 天津力神电池股份有限公司 | Soft-pack lithium-ion battery having high energy density |
-
2012
- 2012-03-01 CN CN2012200730000U patent/CN202495524U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899600A (en) * | 2018-05-17 | 2018-11-27 | 中国电力科学研究院有限公司 | A kind of L-type lithium ion battery and its chemical synthesizing method |
| WO2022205922A1 (en) * | 2021-03-30 | 2022-10-06 | 天津力神电池股份有限公司 | Soft-pack lithium-ion battery having high energy density |
| CN114335425A (en) * | 2022-01-12 | 2022-04-12 | 三一技术装备有限公司 | Pole piece, diaphragm, lamination, battery core manufacturing process and battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |