CN205564829U - Secondary cell and top cap thereof - Google Patents
Secondary cell and top cap thereof Download PDFInfo
- Publication number
- CN205564829U CN205564829U CN201620132779.7U CN201620132779U CN205564829U CN 205564829 U CN205564829 U CN 205564829U CN 201620132779 U CN201620132779 U CN 201620132779U CN 205564829 U CN205564829 U CN 205564829U
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- China
- Prior art keywords
- top cover
- secondary cell
- welding
- housing
- top cap
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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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- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a secondary cell and top cap thereof. The top cap is including being used for the top cap welding with casing welded connection regional, and top cap welding region is equipped with the connector contact face towards the casing, offer the route of ventilating that extends along its welding length orientation on the regional connector contact face of top cap welding, the casing is replaced in order to avoid the splash to fall into the inside splash stop part of battery with the top cap welding regional welded connection portion that is used for with casing welded connection that is divided into with being used for to the route of ventilating. Compared with the prior art, the utility model discloses the secondary cell top cap is through offering the route of ventilating on the regional connector contact face of top cap welding, effectively solved the problem that laser welding produced the gas pocket, has still reduced the emergence of spatter, undercut, and inside the battery directly was fallen into to the splash of having avoided the welding to produce simultaneously, even if it is bad the welding to appear, also need carry out the repair welding could.
Description
Technical field
This utility model belongs to secondary cell and manufactures field, more particularly, it relates to a kind of it can be avoided that the secondary cell of Welding Problems and top cover thereof.
Background technology
In the manufacture process of secondary cell (such as lithium ion battery), after battery core enters shell, need top cover and housing are carried out laser welding, ready for battery liquid-filling.
Refer to Fig. 1 to Fig. 3, between top cover 1 with housing 2, the detailed process of laser welding is: respectively to the upper surface 11 of top cover welding region be connected contact surface 13, the upper surface 21 in case weld region and connect contact surface 22 and be cleaned, then the welding region upper surface 11 and 21 of the two is flattened, finally the mode of contact portion laser full weld is sealed, after having welded, form full weld weld seam 3.
Referring to Fig. 4, for ensureing the reliability of weld seam 3, guaranteeing not on the premise of burn-through top cover 1, for obtaining deeper weld seam, the most general mode using deep penetration welding is welded.During deep penetration welding, the power density of laser 4 is more than 106W/cm2, surface of the work will produce high steam 32, and the strong kickback pressure produced when steam departs from molten bath 34 can generate elongated laser keyhole 33.Once material surface tension exceedes steam kickback pressure, and laser keyhole 33 will be disintegrated, and forms pore 35 in causing steam to be trapped in molten bath 34.The intensity making weld seam 3 is greatly reduced (the typically 50%-75% of mother metal) by the existence of pore 35, and such weld seam 3 exists the biggest potential safety hazard.
Additionally, if the welding region cleaning of top cover 1 or housing 2 is the cleanest, in welding process in addition to producing above-mentioned gas hole defect, also can produce the defects such as splashing, undercut, especially in the case of the welding region near top cover chamfering 12 exists low melting point pollutant, the splash that welding produces can be directly entered inside battery, and the surface of weld seam 3 is without exception, there is the biggest performance hidden danger in this kind of battery, but is but difficult to detection.
In recent years, occur in that some can substantially reduce the special laser technology of weld blowhole, such as, swing laser, double light beam laser etc., but these special laser technologies are the most blank at home, need to put into substantial contribution and introduce from external.Certainly, more domestic companies/scientific research structure uses the thermal conductance weldering mode of low power density also can suppress the generation of pore, but working (machining) efficiency is relatively low.And, in addition to the strict surface cleaning controlling welding region, there is presently no any technological means and can effectively suppress the generation of the defect such as spatter, undercut, strict cleaning requirement will certainly increase production cost and reduce production efficiency.
Utility model content
The purpose of this utility model is: provide secondary cell and the top cover thereof of a kind of improved structure, the generation suppressing the bad defect of laser welding is set by the structure of top cover, and in the case of there is failure welding, still can prevent spatter thing from falling into inside battery by the structure of top cover.
To achieve these goals, this utility model provides a kind of secondary cell top cover, and it includes the top cover welding region for being connected with case weld, and top cover welding region is provided with the connection contact surface of housing；Connecting of described top cover welding region offers the vent path extended along its weld length direction on contact surface, top cover welding region is divided into the welded connection for being connected with case weld and is used for supporting housing to avoid splash to fall into the splash stop part of inside battery by vent path.
As a kind of improvement of this utility model secondary cell top cover, described vent path is distributed on the whole weld length connecting contact surface.
As a kind of improvement of this utility model secondary cell top cover, the cross section of described vent path is rectangle, V-arrangement or arc.
As a kind of improvement of this utility model secondary cell top cover, the height L of described vent path and degree of depth h are 0.3～2mm.
As a kind of improvement of this utility model secondary cell top cover, the thickness H1 of described welded connection is 0.2～2mm.
As a kind of improvement of this utility model secondary cell top cover, the thickness H2 of described splash stop part thinnest part is not more than 2mm not less than 0.3mm, the thickness H3 in thickness.
As a kind of improvement of this utility model secondary cell top cover, described top cover is lamellar body, and connecting contact surface is the outer peripheral face of top cover.
To achieve these goals, this utility model additionally provides a kind of secondary cell, and it includes top cover, housing and battery core；Battery core is contained in housing, and top cover is welded in the opening of housing and realizes the sealing of battery core；Described top cover is the secondary cell top cover described in any of the above-described paragraph.
As a kind of improvement of this utility model secondary cell, the pool depth of the weld seam between described top cover and housing is more than the thickness H1 of welded connection, and is less than the thickness H1 of welded connection and the height L sum of vent path.
As a kind of improvement of this utility model secondary cell, described housing also is provided with connecting contact surface；Before welding, welded connection and the splash stop part of top cover are all supported on the connection contact surface of housing；During welding, vent path provides escape paths to avoid being formed pore in molten bath for high steam after laser keyhole is disintegrated, and meanwhile, the unnecessary molten pool metal and the splash that produce in welding process all can be stopped by splash stop part and stay in vent path.
Compared with prior art, this utility model secondary cell top cover is by offering vent path on the connection contact surface of top cover welding region, efficiently solve the problem that laser welding produces pore, also reduce the generation of spatter, undercut, the splash simultaneously avoiding welding generation directly falls into inside battery, even if failure welding occurs, repair welding the most only need to be carried out.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings and detailed description of the invention, this utility model secondary cell, top cover and Advantageous Effects thereof are described in detail, wherein:
Fig. 1 is the structural representation of secondary cell.
Fig. 2 is top cover and the housing mounting structure schematic diagram before welding of existing secondary cell.
Fig. 3 is the top cover in Fig. 2 and housing solder design structural representation after laser welding.
Fig. 4 is the principle analysis diagram that top cover and the housing of existing secondary cell forms pore in welding process.
Fig. 5 is top cover and the housing mounting structure schematic diagram before welding of this utility model secondary cell.
Fig. 6 is the process schematic that the top cover in Fig. 5 and housing carry out laser welding.
Fig. 7 is the top cover in Fig. 5 and housing solder design structural representation after laser welding.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and Advantageous Effects become apparent from understanding, below in conjunction with the drawings and specific embodiments, this utility model is further elaborated.It should be appreciated that the detailed description of the invention described in this specification is only used to explain this utility model, it is not intended to limit this utility model.
Referring to Fig. 1 and Fig. 5, this utility model secondary cell includes top cover 1, housing 2 and battery core (not shown).Wherein, battery core is contained in housing 2, and top cover 1 is welded in the opening of housing 2 and realizes the sealing of battery core.
Top cover 1 includes the top cover welding region for being welded to connect with housing 2, and top cover welding region is provided with the connection contact surface of housing 2.Connecting of top cover welding region offers the vent path 501 extended along its weld length direction on contact surface.Vent path 501 is preferably distributed on the whole weld length connecting contact surface, and top cover welding region is divided into welded connection 16 and splash stop part 17；Connecting contact surface and be positioned at the part of welded connection 16 for being welded to connect face 160, the part being positioned at splash stop part 17 is support surface 170.
The cross section of vent path 501 is preferably rectangular but it also may be the shape such as V-arrangement or arc, as long as the effect deriving welding steam can be played, the techniques such as machining, Multi-step forming can be used to obtain.The bottom surface of vent path 501 is the blocking surface 172 of splash stop part 17.
In terms of size, the height L of vent path 501 and degree of depth h are 0.3～2mm, and the thickness H1 of welded connection 16 is 0.2～2mm；The thickness H2 of splash stop part thinnest part is not more than 2mm not less than 0.3mm, the thickness H3 in thickness.
Referring to Fig. 5～7, top cover 1 with the welding process of housing 2 is:
First, upper surface 11 and connection contact surface, the upper surface 21 in case weld region and connection contact surface to top cover welding region suitably clean, and then flatten the welding region upper surface 11 and 21 of the two, complete figure as shown in Figure 5；Now, the face that is welded to connect 160 of welded connection 16 and the support surface 170 of splash stop part 17 are all supported on the connection contact surface of housing 2.
Then, use laser 4 that top cover 1 is welded with housing 2.During welding, by controlling the power density of laser 4, making the degree of depth in the molten bath 34 thickness H1 more than welded connection 16, and the height L sum of thickness H1 and the vent path 501 less than welded connection 16, during to guarantee welding, laser keyhole 33 can form through hole and will not burn-through splash stop part 17；In welding process, the kickback pressure produced when high steam 32 departs from molten bath 34 can penetrate welded connection 16 and form laser keyhole 33, and laser keyhole 33 is not only in communication with the outside, but also forms through hole and connect with vent path 501.If the surface tension of material exceedes steam kickback pressure and causes laser keyhole 33 to disintegrate in welding process, so that can not be in communication with the outside, the high steam 32 being blocked will enter vent path 501 by via through holes, form air-flow 32a and 32b to escape from vent path 501, without forming pore in resting on molten bath 34.On the other hand, owing to the support surface 170 of splash stop part 17 is supported on the connection contact surface of housing 2, the unnecessary molten pool metal and the splash that produce in welding process all can be stopped by the blocking surface 172 of splash stop part 17 and stay in vent path 501, cannot fall into inside battery, the weld seam 30 ultimately formed is as shown in Figure 7.Obviously, the space of vent path 501 is the biggest, and the ability accommodating high steam 32 is the strongest, and the ability of the defect that suppression spatter, undercut etc. are caused by low melting point foreign body is the strongest.
In the shown embodiment, top cover 1 is rectangle lamellar body, connect the outer peripheral face that contact surface is top cover 1, therefore vent path 501 is also located on top cover outer peripheral face, but variety classes, shape secondary cell in, top cover 1 can also have a following change: 1) shape of top cover 1 can also be for circular, polygon or irregular shape (such as Special-shaped battery), making to connect contact surface is regular or erose periphery wall, this has no effect on enforcement of the present utility model, only need to vent path 501 be arranged along the weld length connecting contact surface；2) according to actual needs, top cover 1 is likely to other surfaces for connecting contact surface, and such as lower surface, the medial surface etc. of kink, this does not interferes with enforcement of the present utility model yet, only need to vent path 501 be set directly on connection contact surface.
Compared with prior art, this utility model secondary cell top cover is by offering vent path 501 on the connection contact surface of top cover welding region, efficiently solve the problem that laser welding produces pore, also reduce the generation of spatter, undercut, the splash simultaneously avoiding welding generation directly falls into inside battery, even if failure welding occurs, repair welding the most only need to be carried out.
The announcement of book and teaching according to the above description, this utility model those skilled in the art can also carry out suitable change and amendment to above-described embodiment.Therefore, this utility model is not limited to specific embodiment disclosed and described above, should also be as falling in scope of the claims of the present utility model to modifications and changes more of the present utility model.Although additionally, employ some specific terms in this specification, but these terms are merely for convenience of description, this utility model is not constituted any restriction.
Claims (10)
1. a secondary cell top cover, including the top cover welding region for being connected with case weld, top cover welds
Connect region and be provided with the connection contact surface of housing；It is characterized in that: the connection of described top cover welding region connects
Offering the vent path extended along its weld length direction in contacting surface, top cover welding region is divided by vent path
For for the welded connection that is connected with case weld be used for supporting housing to avoid splash to fall in battery
The splash stop part in portion.
Secondary cell top cover the most according to claim 1, it is characterised in that: described vent path is distributed
On the whole weld length connecting contact surface.
Secondary cell top cover the most according to claim 1, it is characterised in that: the horizontal stroke of described vent path
Cross section is rectangle, V-arrangement or arc.
Secondary cell top cover the most according to claim 1, it is characterised in that: the height of described vent path
Degree L and degree of depth h are 0.3～2mm.
Secondary cell top cover the most according to claim 1, it is characterised in that: described welded connection
Thickness H1 is 0.2～2mm.
Secondary cell top cover the most according to claim 1, it is characterised in that: described splash stop part
The thickness H2 of thinnest part is not more than 2mm not less than 0.3mm, the thickness H3 in thickness.
Secondary cell top cover the most according to claim 1, it is characterised in that: described top cover is lamellar body,
Connecting contact surface is the outer peripheral face of top cover.
8. a secondary cell, including top cover, housing and battery core；Battery core is contained in housing, and top cover welds
The sealing of battery core is realized in the opening of housing；It is characterized in that: described top cover is in claim 1 to 7
Secondary cell top cover described in any one.
Secondary cell the most according to claim 8, it is characterised in that: between described top cover and housing
The pool depth of weld seam is more than the thickness H1 of welded connection, and is less than the thickness H1 of welded connection with logical
The height L sum of gas path.
Secondary cell the most according to claim 8, it is characterised in that: described housing also is provided with connection and connects
Contacting surface；Before welding, the welded connection of top cover and splash stop part all support the connection contact surface at housing
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620132779.7U CN205564829U (en) | 2016-02-22 | 2016-02-22 | Secondary cell and top cap thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620132779.7U CN205564829U (en) | 2016-02-22 | 2016-02-22 | Secondary cell and top cap thereof |
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| Publication Number | Publication Date |
|---|---|
| CN205564829U true CN205564829U (en) | 2016-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620132779.7U Active CN205564829U (en) | 2016-02-22 | 2016-02-22 | Secondary cell and top cap thereof |
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| CN (1) | CN205564829U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104207A (en) * | 2016-02-22 | 2017-08-29 | 宁德新能源科技有限公司 | Secondary cell and its top cover |
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2016
- 2016-02-22 CN CN201620132779.7U patent/CN205564829U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104207A (en) * | 2016-02-22 | 2017-08-29 | 宁德新能源科技有限公司 | Secondary cell and its top cover |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |