CN204991783U - Secondary cell top cap - Google Patents
Secondary cell top cap Download PDFInfo
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- CN204991783U CN204991783U CN201520811194.3U CN201520811194U CN204991783U CN 204991783 U CN204991783 U CN 204991783U CN 201520811194 U CN201520811194 U CN 201520811194U CN 204991783 U CN204991783 U CN 204991783U
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- Prior art keywords
- injection hole
- liquid injection
- seal
- secondary cell
- cell top
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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
Abstract
The utility model relates to an energy storage device field especially relates to a secondary cell top cap, and have the lamina tecti and annotate the liquid hole, it runs through to annotate the liquid hole the lamina tecti forms, and seal, the seal with annotate liquid hole interference fit, make the seal is sealed annotate the liquid hole, secondary cell top cap still includes the barrier layer, the barrier layer is located the downside of seal is and can the shutoff annotate the liquid hole. Secondary cell top cap that this application provided is through the downthehole barrier layer that sets up of the notes liquid at the seal downside, can prevent effectively that the seal from forming metal microparticle produced when sealed and the piece electric in -core portion that drops with annotating liquid hole interference fit, having reduced the risk that causes the interior short circuit of electric core, therefore having improved the safety in utilization of electric core.
Description
Technical field
The application relates to energy storage device field, particularly relates to a kind of secondary cell top cover.
Background technology
Energy density is high, average output voltage is high owing to having for lithium ion battery, can fast charging and discharging, long service life, the advantage such as safe and reliable, its application constantly expands, and has been applied to the fields such as electronic product, automobile and electric motor car, Aero-Space, microelectromechanicpositioning and energy storage.
In correlation technique, lithium ion battery liquid injection hole sealing technology is the mode of laser welded seal nail: welded with fluid injection hole wall by metal sealing nail by laser, because welding route is relatively long, and liquid injection hole perisporium has electrolyte to remain, cause there is the problem such as rosin joint or welding microbubble/crackle, greatly reduce the reliability of liquid injection hole sealing.
The patent No. is the encapsulating method that the Chinese patent of CN101331629 discloses a kind of electrolyte injection hole, the method forms downward tapered configuration in the inner upper end of liquid injection hole, and Metal Ball is inserted forcibly this electrolyte injection hole with the sealing making this Metal Ball plastic deformation realize electrolyte injection hole.This method solve the rosin joint or welding microbubble/crack problem that rely on welding manner sealing to exist, but sealing method unresolved interference fit produce metal micro particles and fines problem when forming sealing, to the internal short-circuit risk of battery core be caused drop to battery core inside when this metal micro particles and chip are in fitting tight after, affect the safety in utilization of battery core greatly.
Utility model content
This application provides a kind of secondary cell top cover, effectively can improve the safety in utilization of battery core.
This application provides a kind of secondary cell top cover, have lamina tecti and liquid injection hole, described liquid injection hole runs through described lamina tecti and is formed; And seal, described seal and described liquid injection hole interference fit, make described seal seal described liquid injection hole, it is characterized in that, described secondary cell top cover also comprises barrier layer, and described barrier layer is positioned at the downside of described seal, and can liquid injection hole described in shutoff.
Preferably, described barrier layer is for intercepting pad, and the bottom of described liquid injection hole is provided with lifts platform, described in lift platform and be fixedly connected with lamina tecti and offer through hole, described through-hole diameter is less than the diameter of described liquid injection hole, described obstruct pad described seal and described in lift between platform.
Preferably, described seal and described lamina tecti are metal material.
Preferably, described intercept pad be arranged on described in lift the upper surface of platform.
Preferably, the described material intercepting pad is rubber.
Preferably, described liquid injection hole comprises:
Top chamfer structure, it is by the tip edge internal diameter convergent from top to bottom of described liquid injection hole;
Straight tube structure, its bottom continuous vertical along described chamfering structure is to downward-extension.
Preferably, described seal is ball sealer or cylindrical seal nail.
Preferably, solder joint is formed by spot welding between the top surrounding of described cylindrical seal nail or ball sealer and described liquid injection hole.
Preferably, the bottom of described sealing nail has chamfering structure, the nail of sealing described in this chamfering structure diametrically under reduce gradually and be finally less than the diameter of described liquid injection hole.
Preferably, described liquid injection hole and described platform of lifting are formed in one.
The technical scheme that the application provides can reach following beneficial effect:
The secondary cell top cover that the application provides is by arranging barrier layer in the liquid injection hole on the downside of seal, the metal micro particles that can effectively prevent seal from producing when being formed seal with liquid injection hole interference fit and chip drop to battery core inside, reduce the risk of the internal short-circuit causing battery core, therefore improve the safety in utilization of battery core.
Should be understood that, it is only exemplary that above general description and details hereinafter describe, and can not limit the application.
Accompanying drawing explanation
The seal that Fig. 1 provides for the embodiment of the present application loads the structural representation of the secondary cell top cover before liquid injection hole;
The plan structure schematic diagram of the secondary cell top cover of the employing ball sealer that Fig. 2 provides for the embodiment of the present application;
Fig. 3 is the cross-sectional view not comprising the secondary cell top cover A-A direction in fig. 2 of lifting platform;
Fig. 4 is the cross-sectional view comprising the secondary cell top cover A-A direction in fig. 2 of lifting platform;
The plan structure schematic diagram of the secondary cell top cover with solder joint that Fig. 5 provides for the embodiment of the present application;
Fig. 6 is the cross-sectional view in B-B direction in Fig. 5;
The cross-sectional view of the secondary cell top cover of the employing cylindrical seal nail that Fig. 7 provides for the embodiment of the present application;
The cross-sectional view of the secondary cell top cover of the cylindrical seal nail inside contracted bottom the employing that Fig. 8 provides for the embodiment of the present application;
Fig. 9 is the cross-sectional view of the secondary cell top cover in comparative example 1;
Figure 10 is the cross-sectional view of the secondary cell top cover in comparative example 2.
Reference numeral:
1-lamina tecti;
10-liquid injection hole;
100-medial surface; 102-joint face; 104-top chamfer structure; 106-straight tube structure;
20-lifts platform;
200-endoporus; 202-upper surface;
30-barrier layer;
40-seal;
50-solder joint.
Accompanying drawing to be herein merged in specification and to form the part of this specification, shows the embodiment meeting the application, and is used from specification one principle explaining the application.
Embodiment
Also by reference to the accompanying drawings the application is described in further detail below by specific embodiment."front", "rear" described in literary composition, "left", "right", " on ", D score all with the laying state of the secondary cell top cover in accompanying drawing for reference.
As shown in Fig. 1 to 8, the embodiment of the present application provides a kind of secondary cell top cover, the liquid injection hole 10 comprising lamina tecti 1 and offer on lamina tecti 1, liquid injection hole 10 runs through lamina tecti 1, secondary cell top cover also comprises barrier layer 30 and seal 40, barrier layer 30 is positioned at the downside of seal 40, and can shutoff liquid injection hole 10.
Wherein, liquid injection hole 10 is for pouring into electrolyte.Seal 40 is the critical pieces realizing liquid injection hole 10 sealing, the maximum gauge of seal 40 will be a bit larger tham the diameter of liquid injection hole 10, when seal 40 is stuffed into the inside of liquid injection hole 10 by external force, seal 40 can with liquid injection hole 10 interference fit, make the two close contact, realize sealing effectiveness.Because seal 40 and lamina tecti 1 are often metal material, therefore when seal 40 be extruded to liquid injection hole 10 realize interference fit time, easy generation metal micro particles and fines problem, to the internal short-circuit risk of battery core be caused drop to battery core inside when this metal micro particles and chip are in fitting tight after, affect the safety in utilization of battery core greatly.Therefore, before seal 40 is filled in liquid injection hole 10, need first to adopt barrier layer 30 to block the bottom of liquid injection hole 10, like this while seal 40 realizes sealing, outside the metal micro particles that seal 40 just can produce when being formed seal with liquid injection hole 10 interference fit by barrier layer 30 and chip are all blocked in, battery core inside can not being dropped to, because this reducing the risk of the internal short-circuit causing battery core, improve the safety in utilization of battery core.
The mode arranging barrier layer 30 has multiple.Such as, in one embodiment, before seal 40 is filled in liquid injection hole 10, a certain amount of macromolecular material with certain viscosity is injected in advance in liquid injection hole 10, because this macromolecular material has surface tension, the inside of liquid injection hole 10 can be sticked to, and battery core inside can not be dropped to, thus realize the shutoff to liquid injection hole 10.Fill in seal 40 more subsequently, due to the effect of polymer surface tension force, the microparticle and chip that produce in the process of filling in can be adsorbed.
In order to make macromolecular material keep certain viscosity when injecting, using macromolecular material only as gel state, or the macromolecular material of molten state or elastomeric state also can be adopted.Formed after barrier layer 30 when macromolecular material is injected in liquid injection hole 10, macromolecular material can remain gel, also can by cool or process make it to become solid-state.
In another embodiment, as shown in figures 1 and 3, barrier layer 30 directly can also adopt the obstruct pad of solid forms, before filling in seal 40, adopt the modes such as bonding, heat-sealing, screw connection to be arranged on the bottom of liquid injection hole 10 in advance, make obstruct pad shutoff liquid injection hole 10, as long as the metal micro particles that produced when being formed seal with liquid injection hole 10 interference fit by seal 40 can be realized and chip is all blocked in outer.
In one embodiment, as shown in Figure 4 and Figure 6, arrange in the bottom of liquid injection hole 10 and lift platform 20, lift platform 20 for annular, be connected with the bottom of liquid injection hole 10 outside it, the diameter of its endoporus 200 is less than the diameter of liquid injection hole 10, and lift platform 20 like this and just define one in the bottom of liquid injection hole 10 and annular lift structure, electrolyte can be passed through by the endoporus 200 lifting platform 20.During fabrication, liquid injection hole 10 and lift platform 20 Sheet Metal Forming Technology can be adopted by disposable one-body molded on lamina tecti 1.
When be provided with lift platform 20, the diameter intercepting pad between liquid injection hole 10 and lift platform 20 endoporus 200 between, obstruct pad can be put into by the top of liquid injection hole 10 after electrolyte filling completes like this, and make its free landing and take to be placed on to lift on platform 20, the endoporus 200 lifting platform 20 is blocked simultaneously, can adopt and glued joint or adopt the bottom of seal 40 to prop up modes such as intercepting pad obstruct pad is fixed on lifts on platform 20.In one embodiment, the medial surface 100 bottom liquid injection hole 10 can be connected by the joint face 102 from top to bottom inside contracted with between the upper surface 202 lifting platform 20.Joint face 102 can lead to the obstruct pad in landing process, enables the landing accurately of obstruct pad block endoporus 200 to the centre of lifting platform 20.Joint face 102 can be plane, curved surface, or is jointly made up of the plane of differing tilt angles, different curvature and curved surface.In addition, in one embodiment also by arranging the diminishing top chamfer structure 104 of internal diameter from top to bottom in the tip edge of liquid injection hole 10, extend to form downwards for carrying out with seal 40 the straight tube structure 106 that interference seal coordinates at the bottom continuous vertical of top chamfer structure 104, that can reduce seal 40 like this fills in difficulty.
When adopting obstruct pad as barrier layer 30, owing to being interference fit between seal 40 and liquid injection hole 10, the power needed when filling in seal 40 is comparatively large, intercepts the extruding force just bad control suffered by padding.Therefore the obstruct pad in each embodiment of the application adopts rubber blanket, such obstruct pad can possess larger elasticity, extruding force can be absorbed and improve and the tightness degree of lifting platform 20 and being combined, and then more effective metal impurities such as barrier metal microparticle and chip.
In each embodiment of the application, the shape of seal 40 can be selected as required, generally can make ball sealer (see Fig. 1 to 6) or sealing nail (see Fig. 7 and 8) etc.Ball sealer, such as zirconium pearl or aluminium pill, because be spherical structure, so without the need to adjusting attitude when filling in liquid injection hole 10, and be greater than liquid injection hole 10 due to the diameter of its only mid portion, power required when therefore filling in is also less, more laborsaving.But it is same, active force between ball sealer and liquid injection hole 10 is also relatively little, sealing property is caused comparatively to seal nail poor, for this reason, as shown in Figure 3 and Figure 4, the present embodiment also forms solder joint 50 by spot welding when adopting ball sealer between the top surrounding and liquid injection hole 10 of ball sealer, to reinforce ball sealer, improves sealing property.
For sealing nail, can adopt pure cylindrical structural (see Fig. 7), this structure is comparatively simple, is easy to manufacture.But cylindrical structural is greater than the diameter of liquid injection hole 10 all the time due to diameter, the difficulty therefore filling in liquid injection hole 10 is comparatively large, even may damage liquid injection hole 10.In order to alleviate this problem, make columniform sealing follow closely bottom in the present embodiment and from top to bottom evenly inside contract, the bottom diameter that sealing is followed closely is less than the diameter of liquid injection hole 10, and then forms a chamfering structure (see Fig. 8).By arranging a chamfering structure in the bottom of sealing nail, in this chamfering structure, sealing nail diametrically under reduce gradually and be finally less than the diameter of liquid injection hole 10, can directly be filled in liquid injection hole 10, stretching into afterwards along with sealing nail, the diameter of sealing nail can continue to increase, until be greater than the diameter of liquid injection hole 10, forms interference fit.
Below by test, the sealing effectiveness of the secondary cell top cover that the present embodiment provides is described in detail.
Test example 1
Refer to Fig. 2 and Fig. 4,2000 μm of thick aluminum top plates 1 adopt punching press one-shot forming technique form internal diameter and be 1600 μm and there are 450 μm of thick liquid injection holes 10 lifting platform 20 lower end, endoporus 200 diameter wherein lifting platform 20 is 500 μm.This lamina tecti 1 is welded on battery core shell by laser welding process, a certain amount of electrolyte is injected into battery core inside by liquid injection hole subsequently.Adopt diameter be the obstruct pad of 1400 μm as barrier layer 30, obstructs pad is put in and lifts on platform 20, adopt particle diameter be the zirconium pearl of 2000 μm as seal 40, put into intercept pad after adopt the pressure of 350N that zirconium pearl is assembled to liquid injection hole 10.
Test example 2
Refer to Fig. 5 and Fig. 6, be with the difference of experimental example 1: seal 40 adopts aluminium pill, after assembling, additional laser or soldering point are welded in and form solder joint 50 between the top surrounding of aluminium pill and liquid injection hole 10 and carry out auxiliary fixing.
Test example 3
Refer to Fig. 7, be with the difference of experimental example 1: seal 40 adopts column type aluminium nail, with the pressure of 540N, aluminium nail is assembled in liquid injection hole 10.
Test example 4
Refer to Fig. 8, be with the difference of experimental example 4: the bottom of the cylindrical aluminium nail adopted from top to bottom evenly inside contracts.
Comparative example 1
Refer to Fig. 9, be with the difference of experimental example 1: the upper end of liquid injection hole 10 is processed as downward tapered configuration (45 DEG C of inclinations angle), and adopting aluminium pill to assemble liquid injection hole 10 as seal 40, the bottom of liquid injection hole 10, without lifting platform 20, does not arrange barrier layer 30 yet.
Comparative example 2
Refer to Figure 10, be with the difference of experimental example 3: the upper end of liquid injection hole 10 is processed as downward tapered configuration (45 DEG C of inclinations angle), and the bottom of liquid injection hole 10, without lifting platform 20, does not arrange barrier layer 30 yet.
The lithium ion battery sample chosen respectively in test example 1-4 and comparative example 1-2 after 100 assemblings carries out K value successively and detects, 1.1MPa external pressure sealing propertytest, sealing propertytest after-40 DEG C/85 DEG C circulation thermal shocks 100 times, and completely fill to disassemble and observe internal short-circuit situation, acquired results shows as shown in table 1.
Table 1
After testing, the K value bad product rate of experimental example 1-4 and internal short-circuit ratio are starkly lower than comparative example 1-2.The ratio of low k bad product rate and internal short-circuit can fall in the lithium ion battery of the liquid injection hole hermetically-sealed construction therefore adopting the present embodiment to provide, and the safety in utilization of battery has very large lifting.
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.Within all spirit in the application and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in the application.
Claims (10)
1. a secondary cell top cover, has lamina tecti and liquid injection hole, and described liquid injection hole runs through described lamina tecti and formed; And seal, described seal and described liquid injection hole interference fit, make described seal seal described liquid injection hole, it is characterized in that, described secondary cell top cover also comprises barrier layer,
Described barrier layer is positioned at the downside of described seal, and can liquid injection hole described in shutoff.
2. secondary cell top cover according to claim 1, is characterized in that, described seal and described lamina tecti are metal material.
3. secondary cell top cover according to claim 1 and 2, it is characterized in that, described barrier layer is for intercepting pad, the bottom of described liquid injection hole is provided with lifts platform, described platform of lifting is fixedly connected with lamina tecti and offers through hole, described through-hole diameter is less than the diameter of described liquid injection hole, described obstruct pad described seal and described in lift between platform.
4. secondary cell top cover according to claim 3, is characterized in that, lifts the upper surface of platform described in described obstruct pad is arranged on.
5. secondary cell top cover according to claim 3, is characterized in that, the described material intercepting pad is rubber.
6. secondary cell top cover according to claim 1 and 2, is characterized in that, described liquid injection hole comprises:
Top chamfer structure, it is by the tip edge internal diameter convergent from top to bottom of described liquid injection hole;
Straight tube structure, its bottom continuous vertical along described chamfering structure is to downward-extension.
7. secondary cell top cover according to claim 1 and 2, is characterized in that, described seal is ball sealer or cylindrical seal nail.
8. secondary cell top cover according to claim 7, is characterized in that, forms solder joint between the top surrounding of described cylindrical seal nail or ball sealer and described liquid injection hole by spot welding.
9. secondary cell top cover according to claim 7, is characterized in that, the bottom of described sealing nail has chamfering structure, the nail of sealing described in this chamfering structure diametrically under reduce gradually and be finally less than the diameter of described liquid injection hole.
10. secondary cell top cover according to claim 3, is characterized in that, described liquid injection hole and described platform of lifting are formed in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811194.3U CN204991783U (en) | 2015-10-19 | 2015-10-19 | Secondary cell top cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811194.3U CN204991783U (en) | 2015-10-19 | 2015-10-19 | Secondary cell top cap |
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| Publication Number | Publication Date |
|---|---|
| CN204991783U true CN204991783U (en) | 2016-01-20 |
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| CN201520811194.3U Active CN204991783U (en) | 2015-10-19 | 2015-10-19 | Secondary cell top cap |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262138A (en) * | 2017-07-18 | 2019-01-25 | 大族激光科技产业集团股份有限公司 | A kind of welding method and device of cell sealing nail |
| CN111883734A (en) * | 2020-08-25 | 2020-11-03 | 青岛国轩电池有限公司 | Steel ball sealing device for cylindrical lithium battery |
-
2015
- 2015-10-19 CN CN201520811194.3U patent/CN204991783U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262138A (en) * | 2017-07-18 | 2019-01-25 | 大族激光科技产业集团股份有限公司 | A kind of welding method and device of cell sealing nail |
| CN111883734A (en) * | 2020-08-25 | 2020-11-03 | 青岛国轩电池有限公司 | Steel ball sealing device for cylindrical lithium battery |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 352100 Jiaocheng District of Ningde City, Fujian Province Zhang Wan Zhen Xingang Road No. 1 Patentee after: Contemporary Amperex Technology Co.,Ltd. Address before: 352000 Jiaocheng District of Ningde City, Fujian Province Zhang Wan Zhen Xingang Road No. 1 Patentee before: CONTEMPORARY AMPEREX TECHNOLOGY Ltd. |