CN204216170U - Flexible packing lithium ion battery and core structure thereof - Google Patents
Flexible packing lithium ion battery and core structure thereof Download PDFInfo
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- CN204216170U CN204216170U CN201420623827.3U CN201420623827U CN204216170U CN 204216170 U CN204216170 U CN 204216170U CN 201420623827 U CN201420623827 U CN 201420623827U CN 204216170 U CN204216170 U CN 204216170U
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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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Abstract
The utility model discloses a kind of core structure, for the preparation of flexible packing lithium ion battery, described core structure comprises the first core and the second core, described first core and described second core is takeup type core and the two is arranged in parallel; The thickness of described first core is greater than the thickness of described second core.The two core parallel-connection structures of above-mentioned core structure by by original single rolled cores vibrational power flow being thickness collocation, the thickness of the single core in core structure is reduced relatively, effectively can suppress the torsional deformation of single core, thus can improve significantly to lithium ion cell charging torsional deformation, the torsional deformation after can effectively suppressing battery initially to roll off the production line and circulate.Above-mentioned core structure adopts two core parallel-connection structures of thickness collocation simultaneously, effectively can reduce the internal resistance of core structure, thus reduces the internal resistance of battery, improves multiplying power discharging and the cycle performance of battery.Also disclose a kind of flexible packing lithium ion battery.
Description
Technical field
The utility model relates to lithium ion battery preparing technical field, particularly relates to a kind of flexible packing lithium ion battery and core structure thereof.
Background technology
Current hand-hold mobile digital product and other mobile products that some need charging to use are all use lithium ion battery substantially.The lithium ion battery of main application can be divided at present: lithium ion battery with aluminum shell, the lithium ion battery of cylindrical lithium ion battery and flexible package.The lithium ion battery of flexible package is multiplex at smart mobile phone at present, on the product such as panel computer and dollying.For the lithium ion battery that thickness is larger, because Winding Layer is more, each layer tension force is uneven, and the situation of torsional deformation easily appears in Battery formation after rolling off the production line and circulating, cause the thickness of battery to exceed standard and cycle performance decline, serious meeting causes the shell shake of digital product or screen to split.
Distorting of so-called battery is due to barrier film, and the winding such as pole piece is packed rear and all can be toasted before fluid injection, and bake process septation can be shunk, and the stress of pole piece can discharge, and causes barrier film to strain core, and the situation that pole piece bends, appears in extruding pole piece.Simultaneously because winding battery exists certain winding tension, thicker battery, the number of plies of winding is naturally more, more accumulative the number of plies tension force is also larger, tension force is got between ambassador's pole piece and is fitted tight all the more, when battery is when charging, positive/negative plate all can produce expansion, in addition thick battery winding is very tight, expansion headspace relative deficiency, make to produce internal pressure between pole piece, the girth of the final external diameter of core is fixing, battery will be caused to occur internal pressure at Width, finally cause cell deformation even distortion, along with circulation is carried out, this phenomenon is remarkable all the more.
Utility model content
Based on this, be necessary for the problems referred to above, provide a kind of and can effectively suppress flexible packing lithium ion battery torsional deformation and the low core structure of internal resistance.
A kind of core structure, for the preparation of flexible packing lithium ion battery, described core structure comprises the first core and the second core, described first core and described second core is takeup type core and the two is arranged in parallel; The thickness of described first core is greater than the thickness of described second core.
Wherein in an embodiment, described first core and described second core include anode ear and negative electrode lug; The anode ear of described first core and negative electrode lug are arranged at the inside of described first core; The anode ear of described second core and negative electrode lug are arranged at the outside of described second core; Weld the positive pole as described core structure with the anode ear of described second core after the anode ear bending of described first core; With the negative pole of the negative pole lug welding of described second core as described core structure after the negative electrode lug bending of described first core.
Wherein in an embodiment, anode ear and the negative electrode lug of described first core are all formed with bending segment, are provided with for the fixing described anode ear of the first core and the fluid sealant of negative electrode lug between described bending segment and core.
Wherein in an embodiment, described fluid sealant is high-temp glue ply of paper or the high temperature sandwich rubber of insulation.
Wherein in an embodiment, described first core and described second core include anode ear and negative electrode lug; Anode ear, the negative electrode lug of the anode ear of described first core, negative electrode lug and described second core are all arranged at core outside; The anode ear of the anode ear of described first core, negative electrode lug and described second core, negative electrode lug correspondence recline welding.
Wherein in an embodiment, the described anode ear of the first core is equal with the centre-to-centre spacing of negative electrode lug with the anode ear of described second core with the centre-to-centre spacing of negative electrode lug.
Wherein in an embodiment, the thickness sum of described first core and described second core is more than 5 millimeters.
Wherein in an embodiment, described first core and described second core adopt the volume pin of different size to carry out single rolled cores winding and form.
Wherein in an embodiment, also comprise fixing glue and plastic-aluminum packaging film, described plastic-aluminum packaging film has two different forming tank of the degree of depth, is respectively used to accommodating described first core and described second core; Described fixing glue is arranged at described first core and described second core is outside, for fixing described first core and described second core.
A kind of flexible packing lithium ion battery, comprises at least one core structure as described in aforementioned any embodiment.
Above-mentioned core structure and the two core parallel-connection structures of flexible packing lithium ion battery by by original single rolled cores vibrational power flow being thickness collocation, the thickness of the single core in core structure is reduced relatively, effectively can suppress the torsional deformation of single core, thus can improve significantly to lithium ion cell charging torsional deformation, the torsional deformation after can effectively suppressing battery initially to roll off the production line and circulate.Above-mentioned core structure adopts two core parallel-connection structures of thickness collocation simultaneously, effectively can reduce the internal resistance of core structure, thus reduces the internal resistance of battery, improves multiplying power discharging and the cycle performance of battery.
Accompanying drawing explanation
Fig. 1 is the side-looking structure chart of the core structure in an embodiment;
Fig. 2 be embodiment illustrated in fig. 1 in the schematic diagram of the first core of core structure;
Fig. 3 be embodiment illustrated in fig. 1 in the schematic diagram of the second core of core structure;
Fig. 4 is the end view of the first core of core structure in an embodiment;
Fig. 5 is vertical view and the end view of the shaping dual-slot structure of the plastic-aluminum packaging film of core structure in an embodiment;
Fig. 6 is that embodiment and comparative example 1.0C charge and discharge 300 weeks circulation volumes under 23 degree keep curve.
Embodiment
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.First-selected embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, the object of these embodiments is provided to be make to disclosure of the present utility model more thoroughly comprehensively.
A kind of core structure, for the preparation of flexible packing lithium ion battery.This core structure comprises the first core and the second core, described first core and described second core is takeup type core and the two is arranged in parallel; The thickness of described first core is greater than the thickness of described second core.
Above-mentioned core structure and the two core parallel-connection structures of flexible packing lithium ion battery by by original single rolled cores vibrational power flow being thickness collocation, the thickness of the single core in core structure is reduced relatively, effectively can suppress the torsional deformation of single core, thus can improve significantly to lithium ion cell charging torsional deformation, the torsional deformation after can effectively suppressing battery initially to roll off the production line and circulate.Above-mentioned core structure adopts two core parallel-connection structures of thickness collocation simultaneously, effectively can reduce the internal resistance of core structure, thus reduces the internal resistance of battery, improves multiplying power discharging and the cycle performance of battery.
Fig. 1 is the side-looking structure chart of the core structure in an embodiment.As shown in Figure 1, core structure comprises the first core 110, second core 120 and the fixing glue 130 for fixing the first core 110 and the second core 120.First core 110 and the second core 120 are arranged in parallel.First core 110 and the second core 120 are winding type, and the thickness of the first core 110 is greater than the thickness of the second core 120.Fixing glue 130 is the one in the yellow glue of green glue, transparent adhesive tape and high temperature.In the present embodiment, what fixing glue 130 adopted is green glue.
Fig. 2 be embodiment illustrated in fig. 1 in the schematic diagram of the first core 110, Fig. 3 be embodiment illustrated in fig. 1 in the schematic diagram of the second core 120.Refer to Fig. 2 and Fig. 3, the first core 110 comprises positive plate 112, negative plate 114, barrier film 116 and lug 118.Second core 120 comprises positive plate 122, negative plate 124, barrier film 126 and lug 128.Wherein, positive plate 112 and positive plate 122 are aluminium foil, and negative plate 114 and negative plate 124 are Copper Foil.Barrier film 116 is arranged between positive plate 112 and negative plate 114, and 126, barrier film is arranged between positive plate 122 and negative plate 124.The lug 118 of the first core 110 is arranged at core inside, comprises anode ear and negative electrode lug.The lug 128 of the second core 120 is arranged at the outside of core, comprises anode ear and negative electrode lug.Wherein, the anode ear of the first core 110 is aluminium strip, and negative electrode lug is nickel strap; The anode ear of the second core 120 is aluminium pole ears, and negative electrode lug is then nickel lug.The anode ear of the anode ear of the first core 110 and the centre-to-centre spacing Wt1 of negative electrode lug and the second core 120 and the centre-to-centre spacing Wt2 equal and opposite in direction of negative electrode lug.Fig. 4 is the end view of the first core 110, and the centre-to-centre spacing of its anode ear and negative electrode lug is Wt.Because the thickness and width of rolling up pin can affect thickness and the width of core, volume pin is more thin narrower, and the core reeled is thicker.Therefore in the present embodiment, the first core 110 and the second core 120 are carried out single rolled cores coiling by the volume pin (having the volume pin of different-thickness and width) of different size and are made.
As the electrode of core structure after the lug 118 of the first core 110 bends and welds with the lug 128 of the second core 120 afterwards.That is, the rear positive pole welded with the anode ear of the second core 120 as core structure of anode ear bending of the first core 110, with the negative pole of the negative pole lug welding of the second core 120 as core structure after the negative electrode lug bending of the first core 110.In the present embodiment, the lug 118 of the first core 110 is arranged at core inside, the lug 128 of the second core 120 is arranged at core outside, thus lug 128 place lug 118 of the first core 110 being bent to the second core 120 carries out welding, and the lug 128 of the second core 120 is without the need to bending.In other examples, also the lug 118 of the first core 110 also can be arranged at core outside, and the first core 110 and the second core 120 are reclined in side, lug place.So, the lug of the first core 110 and the second core 120, all without the need to bending, directly welds.In the present embodiment, on the bending segment of the lug 118 of the first core 110 and be also provided with the fluid sealant 140 of the lug 118 for fixing the first core 110 between core.Fluid sealant 140 can be the high-temp glue ply of paper of insulation or high temperature sandwich rubber.Such as, under the bending side of lug 118, paste 1 ~ 2 layer of dark brown high-temp glue or paste 1 layer of black sandwich rubber.The lug 118 of the first core 110 and the lug 128 of the second core 120 weld toe of weld 150 place without the need to carrying out insulating protection.In the present embodiment, above-mentioned core structure also comprises plastic-aluminum packaging film, for packaging first core 110 and the second core 120.Plastic-aluminum packaging film has two different forming tank of the degree of depth, is respectively used to accommodating first core 110 and the second core 120.In other examples, aluminum hull also can be adopted as packaging shell.Tab 160 is for preventing from being short-circuited between the metal tape on lug and housing and can preventing leakage from occurring.
Fig. 5 is vertical view and the end view of the shaping dual-slot structure of the plastic-aluminum packaging film of core structure in an embodiment.Wherein, forming tank 510 is the forming tank of the first core, and forming tank 520 is the forming tank of the second core.The thickness T1 of forming tank 510 is greater than the thickness T2 of forming tank 520, thus makes the thickness of the first core be greater than the thickness of the second core.By the two core parallel-connection structures becoming thickness to arrange in pairs or groups the core vibrational power flow of original single rolled cores, effectively can reduce the thickness of the single core in core structure, the torsional deformation of the single core of effective suppression, thus effectively suppress the torsional deformation after adopting the flexible packing lithium ion battery of this core structure initially to roll off the production line and circulate.And, by single core being set to two core parallel-connection structures of thickness collocation, even if the single core in core structure there occurs torsional deformation, because the two thickness is different, its torsional deformation degree is different, still can form inhibitory action to the torsional deformation of battery.In addition, because its thickness of the two core in core structure is different, internal resistance is not identical yet, effectively can reduce the internal resistance of core structure after the two parallel connection, thus reduces the internal resistance of battery.530 is balloon positions, the gas produced during for storing preliminary filling.Due to the jet-bedding degree of depth more than 5 millimeters time, packaging film aluminium lamination just there will be the risk of drawing crack, and for avoiding occurring this risk, the first core adopting thickness to arrange in pairs or groups in the present embodiment and the second core, the thickness sum of the first core and the second core is more than 5 millimeters.
Above-mentioned core structure and the two core parallel-connection structures of flexible packing lithium ion battery by by original single rolled cores vibrational power flow being thickness collocation, the thickness of the single core in core structure is reduced relatively, effectively can suppress the torsional deformation of single core, thus can improve significantly to lithium ion cell charging torsional deformation, the torsional deformation after can effectively suppressing battery initially to roll off the production line and circulate.Above-mentioned core structure adopts two core parallel-connection structures of thickness collocation simultaneously, effectively can reduce the internal resistance of core structure, thus reduces the internal resistance of battery, improves multiplying power discharging and the cycle performance of battery.
The utility model additionally provides a kind of flexible packing lithium ion battery, comprises the core structure at least one previous embodiment.That is, flexible packing lithium ion battery by single above-mentioned core Structure composing, also can be formed by multiple above-mentioned core structure, thus make flexible packing lithium ion battery have higher capacity.
For the performance of above-mentioned core structure and flexible packing lithium ion battery is better described, carry out experimental verification below in conjunction with comparative example.In the present embodiment, comparative example is the flexible packing lithium ion battery of normal single rolled cores structure, and battery size is 103450 (cell thickness 10.0mm), and nominal capacity is 1800mAh.The flexible packing lithium ion battery comprising the core structure in a present embodiment that embodiment adopts.The core structure of the flexible packing lithium ion battery of the embodiment in this test adopts thickness to be first core of 5.00mm and thickness to be second core of 3.8mm.Table 1 is embodiment and comparative example scheme.
Table 1. embodiment and comparative example scheme
From the design, embodiment wants large 0.2mm compared with the thickness of comparative example.
Use blue electric cell tester and internal resistance test device, vernier caliper, normal temperature capacity is carried out, internal resistance, thickness to the flexible packing lithium ion battery of embodiment and comparative example, the test of multiplying power and cycle performance.Wherein, initial capacity, internal resistance, thickness data is in table 2.
Capacity, internal resistance and the thickness data of table 2. embodiment and comparative example scheme battery
| NO. | Initial 0.5C capacity mAh | Initial full electric cell thickness mm | Internal resistance m Ω |
| Embodiment | 1931.4 | 9.56 | 20.7 |
| Comparative example | 1922.1 | 9.96 | 34.2 |
Remarks: above data are mean value;
Data from table 2 can be seen, embodiment scheme and the basic indifference of comparative example scheme capacity.When the core thickness of embodiment 0.2mm thick in comparative example, the initial battery thickness of embodiment comparatively comparative example on the contrary will low 0.4mm, this is owing to having slight distortion when the battery of single rolled cores structure rolls off the production line, and illustrates that embodiment can to distorting of suppressing this lithium ion battery roll off the production line.Embodiment internal resistance comparatively comparative example will low 14m about Ω, and this is that the migration path of its electronics is relatively short because two core of core structure are equivalent to Double-pole lug structure.
The multiplying power discharging data of embodiment and comparative example are in table 3.
The multiplying power discharging data of table 3. embodiment and comparative example scheme battery
From high rate performance test data, the battery of the embodiment electric discharge mean voltage under various multiplying power discharging condition is apparently higher than the battery of comparative example.From the angle of energy, under identical capacity, the energy of embodiment is more more.
Under normal temperature environment (23 degree), use blue electric cell tester to carry out the normal temperature cycle life test of battery, 1.0C charge-discharge test is carried out to the flexible packing lithium ion battery of embodiment and the flexible packing lithium ion battery of comparative example, obtains the cell thickness after the circulation of discharge capacitance curve as shown in Figure 6 and table 4 and rate of change correction data.
Thickness data behind table 4. embodiment and comparative example scheme battery 300 weeks
| NO. | Initial full electric cell thickness mm | Full electric cell thickness mm after 300 weeks | Thickness change % |
| Embodiment | 9.56 | 10.04 | 5.02 |
| Comparative example | 9.96 | 11.21 | 12.55 |
Remarks: above data are mean value;
From Fig. 1 battery normal temperature, 1.0C charge/discharge capacity conservation rate curve can be seen, the battery of employing embodiment scheme is the same with the battery of comparative example all has good cycle performance, after 300 weeks, capability retention is more than 85%, but the circulation relative contrast regular meeting of embodiment is more better.
Data from table 4 can be seen, the thickness of embodiment after 300 weeks changes to 10.04mm by initial 9.56mm, cell thickness rate of change 5.02%, and the smooth nothing of the battery surface after circulation distorts.And comparative example 300 weeks rear thickness changes to 11.21mm by 9.96mm, the thickness change of battery reaches 12.55%, and on the basis that battery is out of shape in the early stage, degreeof tortuosity worsens further.
The capacity that comprehensive above embodiment and comparative example initially roll off the production line, thickness, internal resistance data, the data that multiplying power discharging data and normal temperature circulate 300 weeks, the flexible packing lithium ion battery of the present embodiment is adopted to reduce the internal resistance of cell, promote multiplying power discharging property and cycle performance, and the obvious inhibitory action that distorted after the distortion that battery is initially rolled off the production line and circulation.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a core structure, for the preparation of flexible packing lithium ion battery, is characterized in that, described core structure comprises the first core and the second core, described first core and described second core is takeup type core and the two is arranged in parallel; The thickness of described first core is greater than the thickness of described second core.
2. core structure according to claim 1, is characterized in that, described first core and described second core include anode ear and negative electrode lug; The anode ear of described first core and negative electrode lug are arranged at the inside of described first core; The anode ear of described second core and negative electrode lug are arranged at the outside of described second core; Weld the positive pole as described core structure with the anode ear of described second core after the anode ear bending of described first core; With the negative pole of the negative pole lug welding of described second core as described core structure after the negative electrode lug bending of described first core.
3. core structure according to claim 2, is characterized in that, anode ear and the negative electrode lug of described first core are all formed with bending segment, is provided with for the fixing described anode ear of the first core and the fluid sealant of negative electrode lug between described bending segment and core.
4. core structure according to claim 3, is characterized in that, described fluid sealant is high-temp glue ply of paper or the high temperature sandwich rubber of insulation.
5. core structure according to claim 1, is characterized in that, described first core and described second core include anode ear and negative electrode lug; Anode ear, the negative electrode lug of the anode ear of described first core, negative electrode lug and described second core are all arranged at core outside; The anode ear of the anode ear of described first core, negative electrode lug and described second core, negative electrode lug correspondence recline welding.
6. the core structure according to the arbitrary claim of claim 2 ~ 5, is characterized in that, the described anode ear of the first core is equal with the centre-to-centre spacing of negative electrode lug with the anode ear of described second core with the centre-to-centre spacing of negative electrode lug.
7. core structure according to claim 1, is characterized in that, the thickness sum of described first core and described second core is more than 5 millimeters.
8. core structure according to claim 1, is characterized in that, described first core and described second core adopt the volume pin of different size to carry out single rolled cores winding and form.
9. core structure according to claim 1, is characterized in that, also comprises fixing glue and plastic-aluminum packaging film, and described plastic-aluminum packaging film has two different forming tank of the degree of depth, is respectively used to accommodating described first core and described second core; Described fixing glue is arranged at described first core and described second core is outside, for fixing described first core and described second core.
10. a flexible packing lithium ion battery, is characterized in that, comprise at least one as arbitrary in claim 1 ~ 9 as described in core structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420623827.3U CN204216170U (en) | 2014-10-24 | 2014-10-24 | Flexible packing lithium ion battery and core structure thereof |
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| CN201420623827.3U CN204216170U (en) | 2014-10-24 | 2014-10-24 | Flexible packing lithium ion battery and core structure thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301144A (en) * | 2018-10-30 | 2019-02-01 | 邦泰宏图（深圳）科技有限责任公司 | A kind of lithium ion battery and battery pack |
| CN112838297A (en) * | 2020-12-29 | 2021-05-25 | 宁德新能源科技有限公司 | Battery cell and electronic equipment |
-
2014
- 2014-10-24 CN CN201420623827.3U patent/CN204216170U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301144A (en) * | 2018-10-30 | 2019-02-01 | 邦泰宏图（深圳）科技有限责任公司 | A kind of lithium ion battery and battery pack |
| CN112838297A (en) * | 2020-12-29 | 2021-05-25 | 宁德新能源科技有限公司 | Battery cell and electronic equipment |
| CN112838297B (en) * | 2020-12-29 | 2023-03-28 | 宁德新能源科技有限公司 | Battery cell and electronic equipment |
| US11955652B2 (en) | 2020-12-29 | 2024-04-09 | Ningde Amperex Technology Limited | Battery cell and electronic device |
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