CN202633449U - Lithium ion battery and positive pole sheet thereof - Google Patents
Lithium ion battery and positive pole sheet thereof Download PDFInfo
- Publication number
- CN202633449U CN202633449U CN2012200798179U CN201220079817U CN202633449U CN 202633449 U CN202633449 U CN 202633449U CN 2012200798179 U CN2012200798179 U CN 2012200798179U CN 201220079817 U CN201220079817 U CN 201220079817U CN 202633449 U CN202633449 U CN 202633449U
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- Prior art keywords
- ion battery
- positive plate
- positive pole
- salient point
- active material
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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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model belongs to the technical field of a lithium ion battery and particularly relates to a positive pole sheet with protruding points on the surface. The positive pole sheet comprises a positive pole current collector and an active material layer coated on the positive pole current collector, protruding points are arranged on the active material layer, and the projection area of the protruding points occupies 5%-50% of the total area of the active material layer. Compared with the prior art, the protruding points are arranged on the surface of the positive pole sheet in a mechanical method so as to enable the positive pole sheet and a negative pole sheet which are attached tightly to generate a gap, the protruding points are pressed flat through expansion of graphite, the expansion of the graphite is accommodated in the generated gap rightly, and outward opening force in a whole battery core is offset. The problem of super thickness and deformation caused by imbalanced internal stress of the battery core can be solved, and deformation rejection rate of batteries is reduced. In addition, a lithium ion battery comprising the positive pole sheet is further disclosed.
Description
Technical field
The utility model belongs to technical field of lithium ion, relates in particular to the lithium ion battery that a kind of surface is provided with the positive plate of salient point and comprises this positive plate.
Background technology
Along with development of modern society, mobile devices such as video camera, notebook computer, portable DVD player and digital camera have had application more and more widely.Lithium ion battery is as a kind of power supply with high-energy-density, high working voltage and long life, and the application in various mobile devices also more and more widely.Yet along with the miniaturization and the lightness of these mobile devices, this just has higher requirement to the energy density as the lithium ion battery of the energy supply element of these mobile devices.
Lithium ion battery generally comprises the pole piece group with winding-structure; The pole piece group by positive plate, negative plate and be interval in positive plate and negative plate between membrane coil around forming; Pole piece is assembled in the battery container and charges into electrolyte, then through encapsulation, ageing, change into operations such as capacity and make lithium ion battery.
Usually; In order to reach higher energy density; Battery manufacturers generally can adopt the method for the compacted density that increases pole piece; But the negative plate with pole piece group of winding-structure itself will expand in the process of battery charging and discharging, and the compacted density that increases pole piece then can cause more serious expansion.And the pole piece group is because the effect of winding tension; Spacing is very little, can't hold this expansion, causes battery distortion or ultra thick; So that exceed mobile device and be the space that battery reserves and can not use, and cycle performance and security performance also can be because battery is out of shape variation.The expansion of negative plate is the physics and the chemical change process of a complicacy, and it mainly is divided into the following aspects: the one, and the Stress Release process after negative plate is colded pressing can cause the expansion of negative plate; The 2nd, in the charge and discharge process, the expansion of graphite system can cause the expansion of negative plate.
In view of this, necessaryly provide a kind of and can hold the based lithium-ion battery positive plate that negative plate expands, reducing the distortion of lithium ion battery, and the lithium ion battery that comprises this positive plate.
The utility model content
One of purpose of the utility model is: to the deficiency of prior art, and a kind of based lithium-ion battery positive plate that negative plate expands that can hold is provided, to reduce the distortion of lithium ion battery.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of based lithium-ion battery positive plate comprises plus plate current-collecting body and is coated in the active material layer on the said plus plate current-collecting body that said active material layer is provided with salient point, and the projected area of said salient point accounts for the 5%-50% of the active material layer gross area.Salient point on the positive plate can be made the gap between positive plate and negative plate, these gaps can hold the expansion of negative plate, thereby prevents the distortion of battery.If the projected area of said salient point is less than 5% of the active material layer gross area, then because salient point very little, make between positive plate and the negative plate the gap very little, just not obvious to the improvement effect of battery distortion; And if the projected area of said salient point greater than 50% of the active material layer gross area, then can cause bigger influence to the energy density of battery.
As a kind of improvement of the utility model based lithium-ion battery positive plate, the projected area of said salient point accounts for the 10%-30% of the active material layer gross area.
As a kind of improvement of the utility model based lithium-ion battery positive plate, the projected area of said salient point accounts for 20% of the active material layer gross area.
A kind of improvement as the utility model based lithium-ion battery positive plate; Said salient point is semicircle, circular, square, rectangle or trapezoidal; These salient points can adopt the method for machining, make salient point through the pole piece surface that acts on that is coated with roller and back of the body rod that has salient point.
A kind of improvement as the utility model based lithium-ion battery positive plate; The spacing of said salient point is 0.5-10mm, if the spacing of salient point is too big, can cause the bigger waste of energy density; If the spacing of salient point is too little, then in the process of making salient point, positive plate is caused damage easily.
As a kind of improvement of the utility model based lithium-ion battery positive plate, the height of said salient point is 0.1-10mm.If the height of salient point is too big, can cause the bigger waste of energy density, and if the height of salient point is too little, then can cause between positive plate and the negative plate the gap very little, be unfavorable for improving the distortion of battery.
As a kind of improvement of the utility model based lithium-ion battery positive plate, said salient point is array distribution on said active material layer.The salient point that is array distribution manufactures than is easier to, and can improve the distortion of electric core more fifty-fifty.
With respect to prior art; The mode that the utility model is made salient point through mechanical means on positive plate surface makes and has produced the gap between the positive plate originally be close to and negative plate; Graphite expansion makes salient point flatten, and just in time makes the gap of generation hold the expansion of graphite, and the power that whole so electric in-core portion outwards struts just is cancelled; Therefore can improve the ultra thick and problem on deformation that electric core brings owing to internal stress is unbalance, reduce the distortion fraction defective of battery.
Make the stress of electric in-core portion reach balance, thereby can improve the ultra thick and problem on deformation of electric core.
Another purpose of the utility model is to provide a kind of lithium ion battery, and comprise positive plate, negative plate, be interval in the barrier film between positive plate and the negative plate, and electrolyte, said positive plate is the described based lithium-ion battery positive plate of above-mentioned paragraph.
With respect to prior art, the utility model lithium ion battery makes between positive plate and the negative plate to have the gap owing to adopted the positive plate with salient point, holding the expansion of negative plate, thereby has less distortion,
Description of drawings
Below in conjunction with accompanying drawing and embodiment, the utility model and useful technique effect thereof are elaborated, wherein:
Fig. 1 is the structural representation of the utility model positive plate;
Fig. 2 is the structural representation of the utility model lithium ion battery.
Embodiment
As shown in Figure 1; A kind of based lithium-ion battery positive plate of the utility model; Comprise plus plate current-collecting body 1 and be coated in the active material layer 2 on the said plus plate current-collecting body 1, said active material layer 2 is provided with salient point 3, and the projected area of said salient point 3 accounts for the 5%-50% of active material layer 2 gross areas; Be preferably 10%-30%, more preferably 20%.Salient point 3 can adopt the method for machining, makes salient point 3 through the pole piece surface that acts on that is coated with roller and back of the body rod that has salient point 3.
Said salient point 3 is semicircle, circular, square, rectangle or trapezoidal.
The spacing of said salient point 3 is 0.5-10mm.
The height of said salient point 3 is 0.1-10mm.
Said salient point 3 is array distribution on said active material layer 2.
As shown in Figure 2; A kind of lithium ion battery; Pack case 40 and the pole piece group 50 that is contained in the said pack case 40; Said pole piece group 50 comprises positive plate 10, negative plate 20, is interval in the barrier film 30 between positive plate 10 and the negative plate 20, and electrolyte, and said positive plate 10 is the described positive plate of above-mentioned paragraph.
Wherein, the concrete preparation process of pole piece group 50 is following:
The preparation of positive plate 10: with LiCoO
2As positive active material, as conductive agent, as binding agent, as solvent, above-mentioned raw materials is mixed the formation anode sizing agent with N-methyl pyrrolidone (NMP) with Kynoar with carbon black; Anode sizing agent is coated on the two sides of plus plate current-collecting body aluminium foil, after the drying, through positive plate 10 rolling, that cutting forms preliminary dimension.
The preparation of negative plate 20:, as binding agent, as solvent, above-mentioned raw materials is mixed as negative electrode active material with graphite, form cathode size with Kynoar with distilled water; Cathode size is coated on the two sides of negative current collector Copper Foil, after the drying, through negative plate 20 rolling, that cutting forms preliminary dimension.
The preparation of pole piece group 50: will be wound into pole piece group 50 through the volume pin according to positive plate 10, negative plate 20 and the polyethylene barrier film 30 of aforementioned prepared.Pole piece group 50 removes the volume pin after reeling and finishing.
The preparation of lithium ion battery: will place pack case 40 according to the pole piece group 50 of aforementioned prepared, and inject electrolyte, and, make the utility model lithium ion battery through encapsulation pack case 40.
After positive plate 10 is made salient points 3, in the process of coiling since the effect of salient point 3 make to produce the gap between positive plate 10 and the negative plate 20, make to be driven plain more easily in the process of graphite expansion.
With respect to prior art; The utility model is reeled through the salient point 3 realization gaps on the positive plate 10; In the process of graphite expansion, flatten salient point 3; Just in time make the gap of generation hold the expansion of graphite, the power that whole so electric in-core portion outwards struts just is cancelled, and therefore can improve the ultra thick and problem on deformation that electric core brings owing to internal stress is unbalance.
According to the announcement and the instruction of above-mentioned specification, the utility model those skilled in the art can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the utility model is not limited to is in the protection range of the claim that also should fall into the utility model to some modifications and the change of the utility model.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 (8)
1. a based lithium-ion battery positive plate comprises plus plate current-collecting body and is coated in the active material layer on the said plus plate current-collecting body, and it is characterized in that: said active material layer is provided with salient point, and the projected area of said salient point accounts for the 5%-50% of the active material layer gross area.
2. based lithium-ion battery positive plate according to claim 1 is characterized in that: the projected area of said salient point accounts for the 10%-30% of the active material layer gross area.
3. based lithium-ion battery positive plate according to claim 1 is characterized in that: the projected area of said salient point accounts for 20% of the active material layer gross area.
4. based lithium-ion battery positive plate according to claim 1 is characterized in that: said salient point is semicircle, circular, square, rectangle or trapezoidal.
5. based lithium-ion battery positive plate according to claim 1 is characterized in that: the spacing of said salient point is 0.5-10mm.
6. based lithium-ion battery positive plate according to claim 1 is characterized in that: the height of said salient point is 0.1-10mm.
7. based lithium-ion battery positive plate according to claim 1 is characterized in that: said salient point is array distribution on said active material layer.
8. a lithium ion battery comprises positive plate, negative plate, is interval in the barrier film between positive plate and the negative plate, and electrolyte, it is characterized in that: said positive plate is each described based lithium-ion battery positive plate of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200798179U CN202633449U (en) | 2012-03-06 | 2012-03-06 | Lithium ion battery and positive pole sheet thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200798179U CN202633449U (en) | 2012-03-06 | 2012-03-06 | Lithium ion battery and positive pole sheet thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202633449U true CN202633449U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200798179U Expired - Lifetime CN202633449U (en) | 2012-03-06 | 2012-03-06 | Lithium ion battery and positive pole sheet thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107403904A (en) * | 2016-05-18 | 2017-11-28 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and negative plate thereof |
| CN107437623A (en) * | 2016-05-27 | 2017-12-05 | 宁德时代新能源科技股份有限公司 | Lithium ion battery positive plate and preparation method thereof |
| CN107681116A (en) * | 2016-08-01 | 2018-02-09 | 宁德时代新能源科技股份有限公司 | Pole piece and battery cell |
| CN110190338A (en) * | 2018-12-22 | 2019-08-30 | 江苏时代新能源科技有限公司 | Electrode assembly and secondary cell |
| WO2024007187A1 (en) * | 2022-07-06 | 2024-01-11 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
-
2012
- 2012-03-06 CN CN2012200798179U patent/CN202633449U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107403904A (en) * | 2016-05-18 | 2017-11-28 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and negative plate thereof |
| CN107403904B (en) * | 2016-05-18 | 2020-03-27 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and negative plate thereof |
| CN107437623A (en) * | 2016-05-27 | 2017-12-05 | 宁德时代新能源科技股份有限公司 | Lithium ion battery positive plate and preparation method thereof |
| CN107437623B (en) * | 2016-05-27 | 2021-02-19 | 宁德时代新能源科技股份有限公司 | Lithium ion battery positive plate and preparation method thereof |
| CN107681116A (en) * | 2016-08-01 | 2018-02-09 | 宁德时代新能源科技股份有限公司 | Pole piece and battery cell |
| CN110190338A (en) * | 2018-12-22 | 2019-08-30 | 江苏时代新能源科技有限公司 | Electrode assembly and secondary cell |
| WO2020124953A1 (en) * | 2018-12-22 | 2020-06-25 | 江苏时代新能源科技有限公司 | Electrode assembly and secondary battery |
| US11811091B2 (en) | 2018-12-22 | 2023-11-07 | Jiangsu Contemporary Amperex Technology Limited | Electrode assembly and secondary battery |
| WO2024007187A1 (en) * | 2022-07-06 | 2024-01-11 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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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: 20121226 |