CN205385061U - Secondary battery - Google Patents
Secondary battery Download PDFInfo
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- CN205385061U CN205385061U CN201620211729.8U CN201620211729U CN205385061U CN 205385061 U CN205385061 U CN 205385061U CN 201620211729 U CN201620211729 U CN 201620211729U CN 205385061 U CN205385061 U CN 205385061U
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- Prior art keywords
- lug
- pin
- battery core
- naked battery
- pole piece
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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 relates to an energy storage device field, especially, relate to a secondary battery, including naked electric core, the top cap, the first ploe post, the second ploe post, first pin and second pin, the top cap is located the top of naked electric core, first ploe post and second ploe post set up the both ends at the top cap respectively, naked electric core is by first pole piece, the second pole piece and lie in first pole piece and the second pole piece between the diaphragm become around the scroll jointly, first pole piece has a plurality of first parts that do not coat of first coating subtotal, leave first clearance between two adjacent first not coating parts, first pole piece is buckled in first clearance department in the naked electric core, all first not coating parts are arranged along the thickness direction of naked electric core and are formed the first ploe ear, the thickness direction bending type of the naked electric core of tip orientation of first ploe ear becomes first link, and laminate with first pin, first pin and first ploe support connnection. The secondary battery that this embodiment provided can improve the energy density of battery.
Description
Technical field
The application relates to energy storage device field, particularly relates to a kind of secondary cell.
Background technology
At present; owing to lithium ion battery has energy density height, power density height, recycles often, stores the advantages such as time length; the portable electric appts such as mobile phone, DV and laptop computer are widely used; and have a wide range of applications in the big-and-middle-sized electrical equipments such as the electric vehicle such as electric automobile, electric bicycle and energy storage facility, become the key solving the global problem such as energy crisis and environmental pollution.
In correlation technique, lug side goes out formula battery and anode pole piece, isolating membrane, cathode pole piece winding is formed by winding.Wherein, positive and negative electrode pole piece is divided into coated portion, uncoated part；Coated portion scribbles active substance, and uncoated part is electrically connected with pole by top cover connecting, it is achieved the electric current of inside battery is transmitted to outside batteries.Owing to positive and negative electrode pole piece scribbles active substance, the thickness thickness more than uncoated part of coated portion can be caused.When, after coiling and molding, in a free state, there is certain gap between the uncoated part of each circle.
In order to allow battery realize being connected with pole, by the uncoated portion compresses of pole piece, in the process compressed, the lug of lug outer ring extremely in ear circle would generally there will be certain dislocation when being typically in connecting, the size of this dislocation is relevant to the thickness of lug.Usually, for ensureing that all lugs are all effectively connected with pin, connecting portion is in all lug overlapping regions, the region that partly overlaps in outside is then without using, this region occupies battery compartment space, causes that the space availability ratio of battery reduces, and the energy density of battery is affected.Usually, if the lug in lug circular arc district is also carried out compression fit, this region is made to be easily subject to damage by inner coated portion, cause that coated active substance comes off, active substance comes off and can have influence on the performance of battery at inside battery formation particulate matter, and even serious meeting makes the security risk of battery generation internal short-circuit.
Utility model content
This application provides a kind of secondary cell, it is possible to be effectively improved the energy density of battery.
Secondary cell provided herein, including naked battery core, top cover, the first pole, the second pole, the first pin and the second pin,
Described top cover is positioned at the top of described naked battery core, described first pole and described second pole are separately positioned on the two ends of described top cover, described naked battery core is formed together about volume by the first pole piece, the second pole piece and the barrier film between described first pole piece and described second pole piece
Described first pole piece has the first coated portion being coated with the first active substance and multiple the first uncoated part being absent from described first active substance, multiple described first uncoated parts are distributed in the side of described first coated portion and along described naked battery core thickness direction stacking
All described first uncoated parts form the first lug, and described first lug is bent to form the first link, described first link and described first pin laminating towards the thickness direction of described naked battery core, and described first pin is connected with described first pole,
Described second pole piece forms the second lug in described naked battery core away from the side of described first lug, and described second lug is connected with described second pole by described second pin.
Preferably, all described first uncoated parts are bent to form described first lug from the side of the thickness direction of described naked battery core.
Preferably, described first pin is fitted and connected away from the side of described naked battery core with described first link.
Preferably, described first pin is fitted and connected towards the side of described naked battery core with described first link.
Preferably, all described first uncoated parts form two described first lugs, and two described first lugs are bent to form described first link from the two of the thickness direction of described naked battery core lateral middle parts respectively, two described first links and described first pin three are fitted and connected successively.
Preferably, two described first lugs surround ring-type, and described first pin is positioned at ring.
Preferably, described second pole piece has the second coated portion being coated with the second active substance and multiple the second uncoated part being absent from described second active substance, multiple described second uncoated parts are distributed in the side of described second coated portion and along described naked battery core thickness direction stacking, all described second uncoated parts are positioned at the described naked battery core side away from described first lug
All described second uncoated parts form described second lug, and described second lug is bent to form the second link towards the thickness direction of described naked battery core, and fits with described second pin, and described second pin is connected with described second pole.
Preferably, described first lug and described second lug are symmetrical arranged.
Preferably, described first lug and/or described second lug are positioned at the top of described naked battery core.
Preferably, described first lug and described first pin are by ultrasonic bonding or resistance welding.
The technical scheme that the application provides can reach following beneficial effect:
Secondary cell provided herein is after coiling forms naked battery core, it is possible at least ensureing that the side of naked battery core is absent from the region that partly overlaps, and can make the lug bending of this side, thus reducing the space that lug takies, improve the energy density of battery.
It should be appreciated that above general description and details hereinafter describe and be merely illustrative of, the application can not be limited.
Accompanying drawing explanation
The overall structure schematic diagram of the secondary cell that Fig. 1 provides for the embodiment of the present application；
The structural representation of the naked battery core that Fig. 2 provides for the embodiment of the present application；
The secondary cell that Fig. 3 provides for the embodiment of the present application look up structural representation；
The close-up schematic view of part A in Fig. 3 corresponding to the secondary cell of the different structure that Fig. 4-6 provides for the present embodiment.
Accompanying drawing labelling:
The naked battery core of 10-；
100-the first lug；100 '-the second lugs；
102-the first link；
20-top cover；
30-the first pole；30 '-the second poles；
40-the first pin；40-the second pin.
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet embodiments herein, and for explaining the principle of the application together with description.
Detailed description of the invention
Below by specific embodiment and in conjunction with accompanying drawing, the application is described in further detail."front", "rear" described in literary composition, "left", "right", " on ", D score is all with the laying state of the secondary cell in accompanying drawing for reference.
As shown in Figure 1, the embodiment of the present application provides one and includes naked battery core 10, top cover the 20, first pole the 30, second pole 30 ', the first pin 40 and the second pin 40 ', top cover 20 is positioned at the top of naked battery core 10, and the first pole 30 and the second pole 30 ' are separately positioned on the two ends of top cover 20.The naked battery core 10 that the present embodiment provides goes out the naked battery core of formula (namely positive and negative lug stretches out respectively) from the two ends of naked battery core 10 for lug side, specifically, naked battery core 10 is formed together about volume by the first pole piece (not shown), the second pole piece (not shown) and the barrier film (not shown) between the first pole piece and the second pole piece.Wherein, the first pole piece can be anode pole piece, it is also possible to be cathode pole piece, not any restriction.Meanwhile, the opposite polarity of the first pole piece and the second pole piece.Correspondingly, the first active substance can be positive active material (such as cobalt acid lithium, LiFePO4), it is also possible to be negative electrode active material (such as carbon, silicon).Meanwhile, the second active substance can be correspondingly negative electrode active material, it is also possible to be positive active material.
First pole piece has the first coated portion being coated with the first active substance and multiple the first uncoated part being absent from the first active substance, and wherein, the first coated portion is used for producing electric energy, and the first uncoated part is then used for carrying electric energy.Multiple first uncoated parts are distributed in the side of the first coated portion.Further, in the naked battery core 10 that coiling is formed, all first uncoated parts in the present embodiment are respectively positioned on the side of naked battery core 10, and arrange along the thickness direction of naked battery core 10, thus constituting the first lug 100 of naked battery core 10.And in the middle of prior art, it being in the corner of Liang Ge up and down of naked battery core 10, the part being used for constituting part overlapping region is then eliminated in the present embodiment.
In the present embodiment, the first uncoated mode that is partially forming mainly has following two, the first is to adopt the first pole piece structure same as the prior art, a complete uncoated part is namely reserved in the side of the first coated portion, then carry out coiling and form naked battery core, after coiling completes, this uncoated part will form spiral helicine structure, now by the part complete resection of two corner locations up and down of corresponding for this helicoidal structure naked battery core 10, remaining part just defines the first uncoated part.
The second way is just a part of every a segment distance excision in complete uncoated part before coiling, the part stayed just becomes the first uncoated part, between adjacent two the first uncoated parts, cut part then forms the first gap, and the interval in this first gap is held particularly important.As in figure 2 it is shown, in the naked battery core 10 that coiling is formed, the first pole piece needs to bend at each first gap location, thus avoiding the formation of the region that partly overlaps.And all first uncoated parts is positioned at the side of naked battery core 10, and arrange along the thickness direction of naked battery core 10, thus constituting the first lug 100 just constituting naked battery core 10.
The first lug 100 now is due to the constraint in the region that do not partly overlap, and therefore can be clamped, bending etc. is processed.Further, in both modes, these first uncoated parts are not necessarily intended to completely overlapped, as long as not affecting following process, allow also to stagger on a small quantity in the short transverse of naked battery core 10.
In the present embodiment, the end of the first lug 100 is bent to form the first link 102 towards the thickness direction of naked battery core 10, and fit together with the first pin 40, the first pin 40 is connected with the first pole 30 again, thus realizing conducting of the first pole 30 and the first pole piece.The first lug 100 after bending can significantly reduce the space of length direction shared by naked battery core 10, therefore improves the energy density of secondary cell.
In the present embodiment, all of first uncoated part can be completely formed first lug 100 (referring to Figure 4 and 5), it is also possible to forms two the first lugs 100 (referring to Fig. 6) respectively.When only forming first lug 100, all first uncoated parts all can be gathered in the side of naked battery core 10 thickness direction and form lug 100 one to one, the end of the first lug 100 or middle part bend towards the opposite side of naked battery core thickness direction afterwards, the first link 102 that first pin 40 can be bent to form with this first lug 100 away from naked battery core 10 side fit (as shown in Figure 4), it is also possible to the first link 102 towards naked battery core 10 side fit (as shown in Figure 5).When first uncoated be partially formed simultaneously two the first lugs 100 time, two the first lugs 100 are bent to form the first link 102 from the two of the thickness direction of naked battery core 10 lateral middle parts respectively, and two the first links 102 and the first pin 40 three fit successively and be attached.Such as the first pin 40 is in the outside of two the first links 102, or the first pin 40 is between two the first links 102.But highly preferred connected mode is for stack two the first links 102, making two the first lugs 100 surround a ring-type, the first pin 40 is then in the inside of this ring, and fits (as shown in Figure 6) with the first link 102.So can reduce the space of length direction shared by electrode tab connection structure in amplitude peak ground.Can be attached by the mode such as ultrasonic bonding or resistance welding between first link 102 and the first pin 40.
The second pole piece in the present embodiment and and the second pin 40 ' between can adopt attachment structure and the connected mode of routine, certainly, according to the first pole piece and the first pin 40 identical structure then better effects if.Specifically, second pole piece has the second coated portion being coated with the second active substance and multiple the second uncoated part being absent from described second active substance, multiple second uncoated parts are distributed in the side of the second coated portion, and leave the second gap between adjacent two the second uncoated parts, in the naked battery core 10 that coiling is formed, second pole piece bends at the second gap location, and all second uncoated parts are positioned at the naked battery core 10 side (referring to Fig. 2) away from the first lug 100, and arrange along the thickness direction of naked battery core 10.All second uncoated parts form the second lug 102, the end of the second lug 100 ' is bent to form the second link (not shown) towards the thickness direction of naked battery core 10, and fit with the second pin 40 ', and it is connected with the second pole 30 ' by the second pin 40 '.
First lug 100 and the second lug 100 ' are preferably maintained in and are symmetrical arranged, to simplify structure, it is simple to processing.And, owing to the naked battery core 10 in the present embodiment goes out formula structure for side, therefore to be easy to the first pin 40 and the second pin 40 ' and the first lug 100 and the second lug 100 ' is attached, the position of the first lug 100 and the second lug 100 ' can be arranged on the top of naked battery core 10 as far as possible, namely near the position of top cover 20.
The secondary cell that the present embodiment provides ensure that naked battery core 10 is absent from the region that partly overlaps, and the first lug 100 and the bending of the second lug 100 ' can be made, thus reducing the first lug 100 and space that the second lug 100 ' takies, improve the energy density of battery.
The foregoing is only the preferred embodiment of the application, be not limited to the application, for a person skilled in the art, the application can have various modifications and variations.All within spirit herein and principle, any amendment of making, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a secondary cell, it is characterised in that include naked battery core, top cover, the first pole, the second pole, the first pin and the second pin,
Described top cover is positioned at the top of described naked battery core, described first pole and described second pole are separately positioned on the two ends of described top cover, described naked battery core is formed together about volume by the first pole piece, the second pole piece and the barrier film between described first pole piece and described second pole piece
Described first pole piece has the first coated portion being coated with the first active substance and multiple the first uncoated part being absent from described first active substance, multiple described first uncoated parts are distributed in the side of described first coated portion and along described naked battery core thickness direction stacking, all described first uncoated parts form the first lug, described first lug is bent to form the first link towards the thickness direction of described naked battery core, described first link and described first pin laminating, described first pin is connected with described first pole
Described second pole piece forms the second lug in described naked battery core away from the side of described first lug, and described second lug is connected with described second pole by described second pin.
2. secondary cell according to claim 1, it is characterised in that all described first uncoated parts are bent to form described first lug from the side of the thickness direction of described naked battery core.
3. secondary cell according to claim 2, it is characterised in that described first pin is fitted and connected away from the side of described naked battery core with described first link.
4. secondary cell according to claim 2, it is characterised in that described first pin is fitted and connected towards the side of described naked battery core with described first link.
5. secondary cell according to claim 1, it is characterized in that, all described first uncoated parts form two described first lugs, and two described first lugs are bent to form described first link from the two of the thickness direction of described naked battery core lateral middle parts respectively, two described first links and described first pin three are fitted and connected successively.
6. secondary cell according to claim 5, it is characterised in that two described first lugs surround ring-type, and described first pin is positioned at ring.
7. the secondary cell according to any one of claim 1 to 6, it is characterized in that, described second pole piece has the second coated portion being coated with the second active substance and multiple the second uncoated part being absent from described second active substance, multiple described second uncoated parts are distributed in the side of described second coated portion and along described naked battery core thickness direction stacking, all described second uncoated parts are positioned at the described naked battery core side away from described first lug
All described second uncoated parts form described second lug, and described second lug is bent to form the second link towards the thickness direction of described naked battery core, and fits with described second pin, and described second pin is connected with described second pole.
8. secondary cell according to claim 7, it is characterised in that described first lug and described second lug are symmetrical arranged.
9. the secondary cell according to any one of claim 1 to 6, it is characterised in that described first lug and/or described second lug are positioned at the top of described naked battery core.
10. the secondary cell according to any one of claim 1 to 6, it is characterised in that described first lug and described first pin are by ultrasonic bonding or resistance welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620211729.8U CN205385061U (en) | 2016-03-18 | 2016-03-18 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620211729.8U CN205385061U (en) | 2016-03-18 | 2016-03-18 | Secondary battery |
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| Publication Number | Publication Date |
|---|---|
| CN205385061U true CN205385061U (en) | 2016-07-13 |
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| CN201620211729.8U Active CN205385061U (en) | 2016-03-18 | 2016-03-18 | Secondary battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762322A (en) * | 2016-03-18 | 2016-07-13 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN111106300A (en) * | 2019-01-30 | 2020-05-05 | 宁德时代新能源科技股份有限公司 | Battery unit cell module |
| CN115702522A (en) * | 2020-06-23 | 2023-02-14 | 宁德新能源科技有限公司 | Battery, electronic device and method for assembling battery |
| US11929510B2 (en) | 2020-05-09 | 2024-03-12 | Contemporary Amperex Technology Co., Limited | Secondary battery and manufacturing method thereof, battery module, and apparatus |
-
2016
- 2016-03-18 CN CN201620211729.8U patent/CN205385061U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762322A (en) * | 2016-03-18 | 2016-07-13 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN111106300A (en) * | 2019-01-30 | 2020-05-05 | 宁德时代新能源科技股份有限公司 | Battery unit cell module |
| CN111106300B (en) * | 2019-01-30 | 2021-05-11 | 宁德时代新能源科技股份有限公司 | Battery unit and battery module |
| US11811017B2 (en) | 2019-01-30 | 2023-11-07 | Contemporary Amperex Technology Co., Limited | Battery unit and battery module |
| US11929510B2 (en) | 2020-05-09 | 2024-03-12 | Contemporary Amperex Technology Co., Limited | Secondary battery and manufacturing method thereof, battery module, and apparatus |
| CN115702522A (en) * | 2020-06-23 | 2023-02-14 | 宁德新能源科技有限公司 | Battery, electronic device and method for assembling battery |
| CN115702522B (en) * | 2020-06-23 | 2024-06-04 | 宁德新能源科技有限公司 | Battery, electronic device and method for assembling battery |
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