CN202758982U - Flexible package coiling type square lithium ion battery - Google Patents
Flexible package coiling type square lithium ion battery Download PDFInfo
- Publication number
- CN202758982U CN202758982U CN2012203116078U CN201220311607U CN202758982U CN 202758982 U CN202758982 U CN 202758982U CN 2012203116078 U CN2012203116078 U CN 2012203116078U CN 201220311607 U CN201220311607 U CN 201220311607U CN 202758982 U CN202758982 U CN 202758982U
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- lithium ion
- flexible package
- ion battery
- battery
- packaging bag
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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 belongs to the field of lithium ion batteries, and particularly relates to a flexible package coiling type square lithium ion battery which comprises a packaging bag, an electric core held in the packaging bag, electrolytes poured in the packaging bag, shell bodies wrapped in the packaging bag, and pole lugs extending out of the shell bodies, wherein the pole lugs comprise positive pole lugs and negative pole lugs. The electronic core is at least provided with two coiling units, and the coiling units are mutually superimposed to form the electric core. The flexible package coiling type square lithium ion battery can effectively reduce internal resistance of the battery, reduces temperature rising in high-powered charging and discharging processes of the battery, and achieves quick charging, quick discharging and the high-powered charging and discharging of the battery. At the same time, the flexible package coiling type square lithium ion battery is simple in process and facilitates large-scale production.
Description
Technical field
The utility model belongs to the lithium ion battery field, particularly a kind of flexible package takeup type rectangular lithium ion battery.
Background technology
At present, rectangular lithium ion battery especially the Soft Roll rectangular lithium ion battery become first-selected or even unique power supply of consumer portable type electronic product.Be accompanied by the mobile communication equipment, the multimedia equipment miniaturization Extraordinary development trend that comprise mobile phone, notebook computer, the performance of using the lithium rechargeable battery on these equipment has been proposed rapid charge characteristic and the high power discharge performance of more and more higher requirement, particularly lithium rechargeable battery.
Conventional softer packing coiled lithium-ion secondary battery only has a positive pole ear and a negative lug, internal resistance own is larger, although not obvious on the battery performance impact when low range discharges and recharges, but when using large multiplying power current charges and high power discharge, the temperature rise of battery body is very large, not only can cause potential safety hazard, and can affect the performance of battery, shorten the useful life of battery.So the standard charging and discharging currents of conventional softer packing coiled lithium-ion secondary battery is made as 0.5C, the duration that always charges has reached 150min, and discharge power only has about 6W.Charging duration and discharge power can not satisfy current demand far away.
For improving the high-power and powerful charge-discharge performance of lithium rechargeable battery, the Chinese invention patent publication number is that CN102208688 proposes to punch out respectively a plurality of lugs on coiled lithium ion battery both positive and negative polarity diaphragm, in the process of reeling positive pole ear and negative lug being stacked up respectively consists of the battery plus-negative plate lug, thereby reduces the internal resistance of cell.But the method aligns the negative lug position and has proposed very high control requirement, in winding process, be difficult to the accurately every tunic leaf length of control, there is deviation in the position when often causing the lug stack, and along with the increase of Winding Layer, deviation can be increasing, causes difficulty finally for the follow-up operations such as closedtop.
The utility model content
The purpose of this utility model is: for the deficiencies in the prior art, and provide a kind of flexible package takeup type rectangular lithium ion battery, the utility model can effectively reduce the internal resistance of cell, reduces the temperature rise in the battery high rate charge-discharge process, realizes the filling soon of battery, puts soon with high-power and discharge and recharge; The utility model technique is simple simultaneously, is convenient to realize large-scale production.
To achieve these goals, the utility model adopts following technical scheme: a kind of flexible package takeup type rectangular lithium ion battery, comprise packaging bag, be contained in battery core in the described packaging bag, be poured into electrolyte in the described packaging bag, be wrapped in the housing of described packaging bag and stretch out in the lug of described housing, described lug comprises positive pole ear and negative lug, described battery core is provided with at least two winder units, and each winder unit mutually superposes and consists of described battery core.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, described battery core is provided with at least four winder units.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, described winder unit comprises anodal diaphragm, the cathode membrane of mutual coiling and is arranged at barrier film between described anodal diaphragm and the described cathode membrane.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, the quantity of described positive pole ear is at least two, each positive pole ear respectively with the anodal diaphragm welding of each winder unit; The material of described positive pole ear and described negative lug can be the metal tape of fine aluminium, fine copper, pure nickel or surface treated aluminium strip, copper strips, nickel strap or copper alloy, nickel alloy, copper facing, nickel plating.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, described negative lug quantity is at least two, and each negative lug is welded with the cathode membrane of each winder unit respectively; Each positive pole ear and each negative lug divide be clipped to the battery core front edge apart from relative deviation within ± 1mm.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, the thickness of described positive pole ear is 0.05-0.15mm, can weld them together by electric resistance welding or ultrasonic bond between two lugs, with further reduction cell resistance.
As a kind of improvement of the utility model flexible package takeup type rectangular lithium ion battery, the thickness of described negative lug is 0.05-0.15mm, and the lug thickness of the battery that the lug of a plurality of winder units is formed by stacking is 0.1-0.6mm.
The beneficial effects of the utility model are: the utility model battery core is set to two winder units at least, and each winder unit mutually superposes and consists of described battery core.The battery of battery core formation has just lacked two-layer packaging film than the battery that the battery core that is connected in parallel consists of like this, and can be less with a baffle, thereby the utility model has been realized the reduction internal resistance of cell, reduce the temperature rise in the battery high rate charge-discharge process, realize the filling soon of battery, put soon with high-power and discharge and recharge; And technique is simple, is convenient to realize large-scale production.
Description of drawings
Fig. 1 is the single winder unit structural representation of the utility model.
Fig. 2 is the core strueture schematic diagram that the utility model comprises two winder units.
Wherein, 1---positive pole ear, 5---cathode membrane, 6---anodal diaphragm, 7---negative lug, 9---barrier film, 10---battery core, 11---winder unit.
Embodiment
Below in conjunction with embodiment and Figure of description, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Flexible package takeup type rectangular lithium ion battery described in the utility model, comprise packaging bag, be contained in battery core 10 in the packaging bag, be poured into electrolyte in the packaging bag, be wrapped in the housing of packaging bag and stretch out in the lug of housing, lug comprises positive pole ear 1 and negative lug 7, battery core 10 is set to two winder units 11 at least, and each winder unit 11 mutually stack consists of battery core 10.
Embodiment, make the 855162 type 3.2Ah lithium rechargeable batteries that two winder units 11 form battery core 10.
The making of winder unit: as shown in Figure 1, the above-mentioned anodal diaphragm 6 of making, cathode membrane 5 and barrier film 9 be wound on obtain together winder unit 11, anodal diaphragm 6 and cathode membrane 5 respectively have 14 layers in each winder unit 11, and outermost layer is cathode membrane 5.The thickness of winder unit 11 is 3.70 ± 0.04mm.Because every pole piece only welds a slice lug and is welded on the pole piece head, can accurately control the lug position in the winding process, reel finish to control positive pole ear 1 and negative lug 7 to the range deviation at battery core edge within ± 0.5mm.
The assembling of battery core 10: as shown in Figure 2, two winder units 11 of making as stated above are superimposed up and down, because winding process can accurately be controlled the lug position of each winder unit 11, so during winder unit 11 stack, positive pole ear 1 and negative lug 7 can accurately overlap, and have avoided causing difficulty because the lug contraposition is bad to operations such as follow-up closedtops.Naked battery core 10 thickness are 7.50 ± 0.06mm after the stack.Then naked battery core 10 is put into the aluminum plastic film of going out in advance pit by design size, behind closedtop, side seal, inject electrolyte.After the sealing through changing into, the technique such as ageing makes the finished product battery.
Comparative example,Make the 855162 type 3.2Ah lithium rechargeable batteries that only comprise a winder unit 11.
It is identical to make the selected both positive and negative polarity of battery and electrolyte material and embodiment, technological process and embodiment that battery is made are also basic identical, the length of different is Comparative Examples both positive and negative polarity diaphragm is longer than embodiment, anodal diaphragm 6 and cathode membrane 5 respectively have 28 layers in the winder unit 11 of coiling gained, the thickness of winder unit 11 is 7.50 ± 0.04mm, only comprises a winder unit 11 in the finished product battery.
Respectively make 500 855162 batteries according to the method for embodiment and Comparative Examples, test its length and width, thick size and capacity, D.C. resistance, AC resistance, the mean value of test result is listed in the table 1.
The average length and width of table 1: embodiment and comparative example, thick size and capacity, D.C. resistance, AC resistance
。
As can be seen from Table 1: the length and width of embodiment and comparative example, thick size and capacity are substantially as broad as long, but the D.C. resistance of embodiment is compared with comparative example with AC resistance and has been obtained declining to a great extent, wherein D.C. resistance is reduced to 35m Ω by 60m Ω, descended 42%, AC resistance is reduced to 50m Ω by 32m Ω, has descended 50%.
The battery of above-described embodiment and comparative example making is carried out respectively the permanent power discharge of 1.8C constant current charge and 15W under 23 ℃ of conditions, charge cutoff voltage is 4.2V, and discharge cut-off voltage is 3.0V, and the monitoring battery surface temperature is as follows in the charge and discharge process.
The utility model embodiment battery maximum temperature in 1.8C constant current charge process is 34.3 ℃, and maximum temperature is 37.1 ℃ in the permanent power discharge process of 15W; And comparative example battery maximum temperature in 1.8C constant current charge process is 40.1 ℃, and maximum temperature is 46.7 ℃ in the permanent power discharge process of 15W.Embodiment maximum temperature in 1.8C constant current charge process is lower 5.8 ℃ than comparative example, and maximum temperature is lower 9.6 ℃ than comparative example in the permanent power discharge process of 15W.
This shows, the structure that the utility model proposes can effectively reduce D.C. resistance and the AC resistance of lithium rechargeable battery, thereby fundamentally improve the large multiplying power of lithium rechargeable battery, the high-power performance that discharges and recharges, reduce the temperature rise of battery in large multiplying power, the high-power charge and discharge process, realize the fast charging and discharging of lithium rechargeable battery.
The according to the above description announcement of book and instruction, the utility model those skilled in the art can also change and revise above-mentioned execution mode.Therefore, the utility model is not limited to above-mentioned embodiment, and any apparent improvement, replacement or modification that every those skilled in the art have done on basis of the present utility model all belong to protection range of the present utility model.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the utility model just for convenience of description.
Claims (7)
1. flexible package takeup type rectangular lithium ion battery, comprise packaging bag, be contained in battery core in the described packaging bag, be poured into electrolyte in the described packaging bag, be wrapped in the housing of described packaging bag and stretch out in the lug of described housing, described lug comprises positive pole ear and negative lug, it is characterized in that: described battery core is provided with at least two winder units, and each winder unit mutually superposes and consists of described battery core.
2. flexible package takeup type rectangular lithium ion battery according to claim 1, it is characterized in that: described battery core is provided with at least four winder units.
3. flexible package takeup type rectangular lithium ion battery according to claim 1 and 2 is characterized in that: described winder unit comprises anodal diaphragm, the cathode membrane of mutual coiling and is arranged at barrier film between described anodal diaphragm and the described cathode membrane.
4. flexible package takeup type rectangular lithium ion battery according to claim 3, it is characterized in that: the quantity of described positive pole ear is at least two, each positive pole ear respectively with the anodal diaphragm welding of each winder unit.
5. flexible package takeup type rectangular lithium ion battery according to claim 3, it is characterized in that: the quantity of described negative lug is at least two, each negative lug respectively with the cathode membrane welding of each winder unit.
6. flexible package takeup type rectangular lithium ion battery according to claim 4, it is characterized in that: the thickness of described positive pole ear is 0.05-0.15mm.
7. flexible package takeup type rectangular lithium ion battery according to claim 5, it is characterized in that: the thickness of described negative lug is 0.05-0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203116078U CN202758982U (en) | 2012-06-29 | 2012-06-29 | Flexible package coiling type square lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203116078U CN202758982U (en) | 2012-06-29 | 2012-06-29 | Flexible package coiling type square lithium ion battery |
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| CN202758982U true CN202758982U (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012203116078U Expired - Lifetime CN202758982U (en) | 2012-06-29 | 2012-06-29 | Flexible package coiling type square lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107729607A (en) * | 2017-09-12 | 2018-02-23 | 合肥国轩高科动力能源有限公司 | A kind of big battery core discharge and recharge Temperature Distribution method of testing of LiFePO4 |
| CN109585908A (en) * | 2018-12-27 | 2019-04-05 | 深圳瑞隆新能源科技有限公司 | A kind of flexible packing lithium ion electric core and battery |
-
2012
- 2012-06-29 CN CN2012203116078U patent/CN202758982U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107729607A (en) * | 2017-09-12 | 2018-02-23 | 合肥国轩高科动力能源有限公司 | A kind of big battery core discharge and recharge Temperature Distribution method of testing of LiFePO4 |
| CN109585908A (en) * | 2018-12-27 | 2019-04-05 | 深圳瑞隆新能源科技有限公司 | A kind of flexible packing lithium ion electric core and battery |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130227 |