CN102694135A - Battery cap assembly and lithium battery - Google Patents
Battery cap assembly and lithium battery Download PDFInfo
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- CN102694135A CN102694135A CN2011100732330A CN201110073233A CN102694135A CN 102694135 A CN102694135 A CN 102694135A CN 2011100732330 A CN2011100732330 A CN 2011100732330A CN 201110073233 A CN201110073233 A CN 201110073233A CN 102694135 A CN102694135 A CN 102694135A
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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 invention provides a battery cap assembly which comprises: an electrically-connected assembly, and a sealing ring disposed outside the electrically-connected assembly; the electrically-connected assembly orderly comprises an explosion-proof plate, a PTC, and an upper cap which are in electrical connection; the upper cap, the PTC, and the explosion-proof plate are orderly stacked in the sealing ring; the edge of the explosion-proof plate turns up to wrap the PTC and the upper cap; an insulation ring is disposed between the upper cap and the explosion-proof plate; wherein the PTC comprises a PTC body, a first metal layer and a second metal layer disposed on the upper and lower surface of the PTC body; the first metal layer is welded with the upper cap; the second metal layer is welded with the explosion-proof plate. In addition, the invention also provides a lithium battery using the cap assembly. The cap assembly of the invention has no impedance value drift or increase during the long term application of the battery.
Description
Technical field
The present invention relates to field of batteries, relate in particular to a kind of cap assembly and the lithium battery that uses this cap assembly.
Background technology
Along with the fast development of IT industry, desktop computer has turned to the notebook computer of light and handy portable band, and the digital product of small volume and less weight of all kinds has also all replaced traditional product gradually like digital camera, video camera etc.And all being chargeable chemical cell, these Related product power resources (mainly use column lithium ion battery; Like circular 1865 types etc.; Advantage is that circular batteries is long-pending littler than square cell body, assembling is easy to make); And the demand cumulative year after year, the quality of battery directly influences this performance of products.
As the used battery of the said goods; Compare with traditional lead-acid battery, Ni-MH battery; Column lithium ion battery with its high power capacity, have extended cycle life, pollution-free, operating voltage is high, fail safe is good etc., and series of advantages is paid much attention to; Obtained fast development, the used battery of digital product all is lithium ion battery basically.
Existing lithium battery is made up of shell, electric core, cap assembly.Wherein, an end of shell is provided with opening, and electric core is reeled by positive plate, barrier film and negative plate and formed; It places shell and draws through first lug, second lug; Wherein first lug is electrically connected with shell, and second lug is electrically connected with cap assembly, also is injected with electrolyte in the shell; Lithium ion is deviate from through electrolyte, barrier film to embed negative pole by positive pole during charging, and lithium ion is deviate from through electrolyte, barrier film to be embedded into positive pole by negative pole during discharge.What deserves to be mentioned is that cap assembly is used for the opening of can, have sealing and protective effect concurrently.As shown in Figure 1, existing cap assembly comprises electrical connection module and the sealing ring 7' that is located at the electrical connection module outside, and electrical connection module comprises orifice plate 6', bursting diaphragm 4', PTC 3' and the last cap 1' that is electrically connected successively; Said upward cap 1', PTC 3', bursting diaphragm 4', orifice plate 6' stack gradually and place sealing ring 7'; Edge through bursting diaphragm 4' wraps up said PTC 3' and last cap 1' to upper overturning; Said go up also to be provided with between cap 1' and the bursting diaphragm 4' be used to the insulated ring 2' that prevents that cap 1' and bursting diaphragm 4' from electrically contacting; Also be provided with orifice plate packing ring 5' between bursting diaphragm 4' and the orifice plate 6', PTC 3' tightly fits between cap 1' and the bursting diaphragm 4'.This compound mode is the fixing contact of lamination bending; The cap assembly of this compound mode uses in lithium battery, in the long-term use of lithium battery, because external shock and fixture (like bursting diaphragm) are aging; Loose contact can appear between last cap 1', bursting diaphragm 4' and the PTC 3'; The phenomenon that contacts internal resistance meeting generation drift or rising between last cap 1', bursting diaphragm 4' and the PTC 3' finally causes self-discharge of battery big, and heating is serious in the use; Cause internal short-circuit of battery or on fire what is more, cause bigger security incident.
Summary of the invention
The technical problem that the present invention will solve is in the cap assembly of battery in the prior art; PTC and last cap are fixed to the upper overturning parcel through the edge of bursting diaphragm; PTC fits between cap and the bursting diaphragm; Because external shock and fixture are aging, the technical problem that contacts internal resistance meeting generation drift or rising between last cap, bursting diaphragm and the PTC.
In order to solve the problems of the technologies described above; The present invention provides a kind of cap assembly of battery; Comprise: comprising: electrical connection module and the sealing ring that prevents that electrical connection module and battery case from electrically contacting of being used to of being located at the electrical connection module outside, said electrical connection module comprises bursting diaphragm, PTC and the last cap of electrical connection successively; The said cap, PTC, bursting diaphragm gone up stacks gradually and places sealing ring, and the edge of said bursting diaphragm wraps up said PTC and last cap to upper overturning, also is provided with between last cap and the bursting diaphragm to be used to the insulated ring that prevents that cap and bursting diaphragm from electrically contacting; Wherein, said PTC comprises the PTC body and is located at the first metal layer and second metal level on the upper and lower surface of PTC body, and said the first metal layer welds with the said cap of going up mutually, and said second metal level welds with said bursting diaphragm mutually.
At described cap assembly; Preferably; Said going up on the cap offers through hole, and the upper surface of said PTC offers first counterbore that communicates with said through hole, and said first counterbore passes the first metal layer and PTC body; The part that said second metal level is positioned at said first counterbore is first Welding Area, and said bursting diaphragm welds with said first Welding Area mutually.
At described cap assembly; Preferably, the lower surface of said PTC offers second counterbore, and said second counterbore passes second metal level and PTC body; The part that said the first metal layer is positioned at said second counterbore is second Welding Area, and the said cap of going up welds with said second Welding Area mutually.
At described cap assembly, preferably, the said cap of going up comprises the lug boss of being located at the middle part and the connecting portion that is provided with around this lug boss; Said through hole is opened in said connecting portion, and the diameter of through hole is less than the radial dimension of said connecting portion.
At described cap assembly, preferably, said through hole is 1-6, the diameter of through hole be said connecting portion radial dimension 1/6 ~ 1/3.
At described cap assembly, preferably, said through hole is two, and these two through holes are that the center is symmetrical set.
At described cap assembly; Preferably; It is characterized in that said PTC is ring-shaped P TC, said first counterbore and second counterbore are respectively 1-6; The diameter of first counterbore and second counterbore be respectively said PTC radial dimension 1/6 ~ 1/3, the quantity and the size of the quantity of said first counterbore and size and said through hole are consistent.
At described cap assembly, preferably, said first counterbore is two, the setting that is centrosymmetric of these two first counterbores.
At described cap assembly, preferably, said second counterbore is two, the setting that is centrosymmetric of these two second counterbores; And the line of the line of two second counterbores and two first counterbores is 20-160 °.
In addition, the present invention also provides a kind of lithium battery, comprising: shell, the electric core and the electrolyte that are used for the cap assembly of closure and are positioned at the cavity that shell and cap assembly surround; Lead to first lug and second lug on the electricity core, wherein first lug is electrically connected with shell, and second lug is electrically connected with cap assembly; Said cap assembly adopts aforesaid cap assembly.
Cap assembly of the present invention welds the first metal layer of PTC upper surface with the said cap of going up mutually; Second metal level of PTC lower surface welds with said bursting diaphragm mutually; Owing to for welding manner is connected, reduced the resistance value of cap assembly itself between PTC and last cap, the bursting diaphragm, and the welded type connection makes cap assembly in the long use of battery later stage; Can be because of external shock and fixture are not aging, contact-making surface loose contact and make the resistance value generation drift or the rising of cap assembly.
Description of drawings
Fig. 1 is the cutaway view of the cap assembly of lithium battery of the prior art.
Fig. 2 is the cutaway view of cap assembly of the lithium battery of the preferred embodiment of the present invention.
Fig. 3 is the perspective exploded view of cap assembly shown in Figure 2.
Fig. 4 is the front view of the PTC shown in Fig. 2.
Fig. 5 is a PTC shown in Figure 4 cutaway view along the A-A direction.
Fig. 6 is a PTC shown in Figure 4 cutaway view along the B-B direction.
Fig. 7 is the cutaway view of the lithium battery of the preferred embodiment of the present invention.
Embodiment
Specifically describe embodiment of the present invention below in conjunction with Figure of description.
As shown in Figure 7, the invention provides a kind of lithium battery, comprise shell 20, cap assembly 10 and be positioned at shell 20 and 10 of cap assemblies surround the electric core 30 and the electrolyte of cavity; Lead to first lug and second lug (not shown) on the electricity core 30, wherein first lug is electrically connected with shell 20, and second lug is electrically connected with cap assembly 10.
Among the present invention, do not have particular determination for the positive and negative polarity of first lug, second lug, promptly cap assembly 10 being connected with positive electrical or being connected with negative electricity does not have particular determination.For example: can first lug be anodal, second lug be a negative pole; Can first lug be negative pole also, second lug be anodal.Generally, first lug is a negative pole, and second lug is anodal; Be that shell 20 is connected with negative electricity, cap assembly 10 is connected with positive electrical.
In the lithium battery of the present invention, electric core 30 is so-called positive plate, barrier film, negative plate through reeling or somely repeatedly repeating stacked and the assembly that electric energy is provided that form.Draw positive pole ear on the positive plate in the electricity core 30, draw negative lug on the negative plate, positive pole ear, negative lug are electrically connected with shell 20, cap assembly 10 respectively through the mode of welding again.As for the manufacturing approach of positive plate, negative plate, barrier film, and other technology for manufacturing electric core etc. are conventionally known to one of skill in the art, therefore repeat no more.
The assembling of lithium battery of the present invention can be carried out as follows: barrier film winding positive electrode sheet and negative plate form electric core 30; Electric core 30 is inserted shell 20 inner chambers; Positive plate, negative plate lead to lug respectively, are connected with shell 20, cap assembly 10 respectively through leader; The electrolyte that reinjects floods electric core, subsequently, cap assembly 10 and the shell 20 that electric core 30 is housed is sealed, and gets final product lithium battery of the present invention; Lithium battery of the present invention is for adopting the lithium battery of improved cap assembly 10, and the concrete improvement of cap assembly 20 is detailed as follows.
The cap assembly of the preferred embodiment of the present invention is the cap assembly of cylinder type lithium battery; Its structure such as Fig. 2 and shown in Figure 3; The sealing ring 7 that prevents that electrical connection module and battery case from electrically contacting of being used to that comprises electrical connection module and be located at the electrical connection module outside, electrical connection module comprises orifice plate 6, bursting diaphragm 4, PTC 3 and the last cap 1 of electrical connection successively from bottom to up; The said cap 1, PTC 3, bursting diaphragm 4 gone up stacks gradually and places sealing ring 7, and the edge of said bursting diaphragm 4 wraps up said PTC 3 and last cap 1 to upper overturning, also is provided with between last cap 1 and the bursting diaphragm 4 to be used to the insulated ring 2 that prevents that cap 1 and bursting diaphragm 4 from electrically contacting.
The structure of said sealing ring 7 be shaped as conventionally known to one of skill in the artly, its role is on the one hand be used to fill the space between shell 20 and the cap assembly 10, prevent battery leakage; On the other hand, be used for insulation crust 20 and cap assembly 10, prevent the battery short circuit.
Said orifice plate 6 is positioned between second lug (not shown) and the bursting diaphragm 4; The structure of orifice plate 6 be shaped as conventionally known to one of skill in the art; The lower surface of orifice plate 6 is electrically connected with second lug, and the middle part of orifice plate 6 upper surfaces realizes being electrically connected through the multiple spot welding with the recessed portion at bursting diaphragm 4 middle parts; Orifice plate 6 is provided with first steam vent, and last cap 1 is provided with second steam vent.As those skilled in the art's common practise, the number of first steam vent, second steam vent does not have particular determination, can be one or more, and the gas of inside battery can pass through first steam vent on the orifice plate 6, second steam vent of going up on the cap 1 is discharged battery.In addition, also be provided with orifice plate packing ring 5 between bursting diaphragm 4 and the orifice plate 6, said orifice plate packing ring 5 is located at orifice plate 6 upper surface peripheries, and the recessed portion at said bursting diaphragm 4 middle parts passes orifice plate packing ring 5 and welds mutually with the middle part of orifice plate 6 upper surfaces.
Consult Fig. 2, said insulated ring 2 is arranged at the periphery of cap 1, and the periphery of bursting diaphragm 4 wraps up said insulated ring 2 to upper overturning, is used to prevent that bursting diaphragm 4 directly is electrically connected with last cap 1.Insulated ring 2, orifice plate packing ring 5 all can adopt this area high temperature fluoroplastics packing ring commonly used, preferably adopt perfluoroalkoxy resin (PFA), in the time of can preventing battery high-temperature packing ring softening, melt and cause the cap assembly outage to be lost efficacy.
Shown in Fig. 4-6, said PTC 3 comprises: PTC body 30 and first, second metal level 31,32 that lays respectively at PTC body 30 upper and lower surfaces; Wherein, said first, second metal level 31,32 can be processed by any electric conducting material, is preferably nickel foil layer or aluminium foil layer; Said PTC body 30 can be for well known to a person skilled in the art thermally sensitive macromolecule polymer material, for example: can be by the conducting particles of 57wt% high density polyethylene (HDPE), 3wt% ethylene-ethyl acrylate copolymer and 40wt% 160-190 ℃ of mixing forming down; Then with nickel foil or this mixing thing of aluminium foil clamping, with hot press at 190 ℃, 5kg/cm
2, hot-formingly under 60 seconds the condition can obtain PTC 3.
PTC 3 (Positive Temperature Coefficient semistor) is set between last cap 1 and bursting diaphragm 4, comes feedback inside battery abnormal conditions in time through the sensitivity of 3 pairs of temperature of PTC.PTC 3 mainly plays the effect of overcurrent protection and overtemperature protection; The structure of PTC 3 has been conventionally known to one of skill in the art; In the cylindrical lithium ion battery of present embodiment, adopt the PTC of ring-type, electric current is successively through orifice plate 6, bursting diaphragm 4, PTC 3 and last cap 1.When loading current too high; When the temperature of PTC body 30 was higher than the start-up temperature (80 ℃ ~ 100 ℃) of PTC body 30, the polymer crystallite fusing in the PTC body 30 became the state of indefinite form, and PTC body 30 expands in the fusion process; Make conductive particle stagger each other; Cause the nonlinear rapid rising of internal resistance, thereby the restricted passage electric current plays a protective role.
But the edge bending of said bursting diaphragm 4 as those skilled in the art's common practise, has circular score line on the bursting diaphragm 4; When inside battery air pressure is excessive; Bursting diaphragm 4 breaks from indentation, prevents that the inside battery gases at high pressure from draining rapidly, avoids the untimely battery explosion that causes of exhaust.
Consult Fig. 1, in the prior art, PTC 3' tightly fits between cap 1' and the burst disk 4'; Wherein, The first metal layer of PTC 3' upper surface contacts with last cap, and second metal level of PTC 3' lower surface contacts with bursting diaphragm, and this way of contact is in the long-term use of battery; Can be because the aging loose contact that causes PTC 3' and last cap 1', bursting diaphragm 4' of external shock or bursting diaphragm causes contacting internal resistance generation drift or rising.Thereby; In the present invention; Said the first metal layer 31 is welded with the said cap 1 of going up mutually, and said second metal level 32 welds with said bursting diaphragm 4 mutually, is connected for welding manner between PTC 3 and last cap 1, the bursting diaphragm 4; Reduced the resistance value of cap assembly itself; And welded type connects makes cap assembly in the long use of battery later stage, can be because of fixture (like bursting diaphragm 4) is aging, and contact-making surface loose contact (like loosening or oxidation) and make the resistance value generation drift or the rising of cap assembly.
Consult Fig. 2-6; In the present embodiment; The first metal layer 31 of said PTC 3 is gone up the welding of cap 1 and second metal level 32 of PTC 3 weld through counterbore welding realization with said bursting diaphragm 4 mutually with said, specifically, offers through hole 11 on the cap 1 on said; Said upward cap 1 can adopt the last cap of existing structure; Comprise the lug boss 12 of being located at the middle part and the connecting portion 13 that is provided with around this lug boss 12, said lug boss 12 is as the connecting portion of drawing battery electrode, and said connecting portion 13 is used for contacting with PTC 3.Said through hole 11 is opened on the said connecting portion 13, and the quantity of through hole 11 is not had particular determination, can be one or more, and the diameter of through hole 11 is less than the radial dimension of said connecting portion 13; For the setting that guarantees through hole 11 does not influence being electrically connected of cap 1 and PTC 3, preferably, the quantity of said through hole 11 is 1-6, the diameter of through hole 11 be said connecting portion 13 radial dimension 1/6 ~ 1/3; More preferably, as shown in Figure 2, said through hole 11 is two, and the setting that is centrosymmetric is to make things convenient for contraposition and welding.
Consult Fig. 4 and Fig. 5; Said PTC 3 is ring-shaped P TC, and the upper surface 31 of PTC 3 offers first counterbore 33, said first counterbore 33 and said through hole 11 corresponding settings; And said first counterbore 33 passes the first metal layer 31 and PTC body 30, and it is not impaired to keep second metal level 32 simultaneously.Quantity to first counterbore 33 does not have particular determination, can be one or more, and preferably, said first counterbore 33 is 1-6, the diameter of first counterbore 33 be said PTC 3 radial dimension 1/6 ~ 1/3.Owing to require said first counterbore 33 and said through hole 11 corresponding settings and connection; Thereby the quantity of said first counterbore 33 and size should be consistent with the quantity and the size of said through hole 11; Shown in Fig. 2-5, in the present embodiment, said first counterbore 33 is two; The setting that is centrosymmetric of these two first counterbores 33 correspondingly with described two through holes 11 respectively is provided with and communicates.
Consult Fig. 4 and Fig. 6, the lower surface of said PTC 3 offers second counterbore 34, and said second counterbore 34 passes second metal level 32 and PTC body 30, and it is not impaired to keep the first metal layer 31 simultaneously.Quantity to second counterbore 34 does not have particular determination; Can be one or more, preferably, said second counterbore 34 is 1-6; The diameter of second counterbore 34 be said PTC 3 radial dimension 1/6 ~ 1/3; And second counterbore 34 is 20-160 with the line at PTC 3 centers and the line at first counterbore 33 and PTC 3 centers, is convenient to the setting of first counterbore and second counterbore, to avoid interference.In the present embodiment, said second counterbore 34 is two, the setting that is centrosymmetric of these two second counterbores 34, and the line of the line of these two second counterbores 34 and two first counterbores 33 is 90 °.
1), will go up cap 1 and PTC 3 is overlapping the assembling of the cap assembly of present embodiment can be carried out as follows:; Make two first counterbores that two through holes 11 offering on the cap 1 and PTC 3 upper surfaces offer 33 corresponding and be communicated with; Second counterbore of offering through PTC 3 lower surfaces then 34 welds; Because second counterbore 34 passes second metallic plate 32 and PTC body 30, welds through said second counterbore 34, said the first metal layer 31 is welded mutually with the said cap 1 of going up.More particularly; The part that said the first metal layer 31 is positioned at said second counterbore 34 is second Welding Area 311; Through above-mentioned welding; The said cap 1 of going up weld with said second Welding Area 311 mutually, and in the present embodiment, two second Welding Areas 311 on the said the first metal layer 31 of going up cap 1 and PTC 3 directly are connected through welding formation.2), with the edge of buckling cap 1 and PTC 3 in the insulated ring 2, the edge of said bursting diaphragm 4 is to upper overturning wrap insulate circle 2 and PTC 3 that has been welded to connect and last cap 1; 3), because two first counterbores that two through holes 11 offering on the last cap 1 and PTC 3 upper surfaces are offered 33 are corresponding and be communicated with; And because said first counterbore 33 passes the first metal layer 31 and PTC body 30; Weld through said through hole 11, first counterbore 33, make said second metal level 32 weld mutually, more particularly with said bursting diaphragm 4; The part that said second metal level 32 is positioned at said first counterbore 33 is first Welding Area 321; Through above-mentioned welding, said bursting diaphragm 4 welds with said first Welding Area 321 mutually, will go up cap 1, PTC 3, bursting diaphragm 4 through above-mentioned steps and be welded as a whole; 4), be welded to bursting diaphragm 4 opposite sides after 5 combinations of orifice plate 6 and orifice plate packing ring again, then the electrical connection module that combines is put into sealing ring 7, obtain cap assembly.
Among the present invention, the electrical connection in the cap assembly between the electrical connection module is contacting of face and face, can weld through common electric welding mode or Laser Welding; Also can pass through electron beam or ratio-frequency welding welding; And, the first metal layer 31 and said welding of going up cap 1, said second metal level 32 also can pass through electron beam or ratio-frequency welding welding with the welding of said bursting diaphragm 4; Thereby can improve the adhesion between the cap assembly, effectively reduce the internal resistance of cap assembly; In addition, adopt the electric connection mode of electron beam or ratio-frequency welding, at high-frequency vibration, fall, can prevent effectively that cap assembly from suffering outside destroy to cause internal resistance to be drifted about during rollover test.
Compare with existing block sub-assembly, because the cap assembly of the preferred embodiment of the present invention has following advantage:
One, all be welded to connect owing between the electrical connection module, especially going up between cap, PTC, the bursting diaphragm is that welding manner connects, and has reduced the resistance of cap assembly itself, consults table 1:
Table 1
The welded type connection of two, going up between cap, PTC, the bursting diaphragm makes cap assembly in the long use of battery later stage, can not reach resistance generation drift or the rising that oxidation makes cap assembly because of the aging contact-making surface of fixture is loosening; And this cap assembly is used for battery, can prevent effectively that self-discharge of battery is big, and the capacity of emitting hangs down and the use heating seriously causes internal short-circuit and phenomenon on fire.
It is understandable that; As long as can said the first metal layer 31 be welded with the said cap 1 of going up mutually; Said second metal level 32 welds with said bursting diaphragm 4 mutually; The welding manner that cap 1, PTC 3, bursting diaphragm 4 are integrally formed all can be used for the present invention, is not limited to the mode of above-mentioned preferred embodiment.For example: in other embodiments of the invention, can on second metal level 32 of PTC 3, not offer second counterbore 34, do not realize the first metal layer 31 and said welding of going up between the cap 1 through second counterbore 34; But can directly be welded on the first metal layer 31 going up cap 1, but this mode is the material of iron nickel plating to the having relatively high expectations of welding procedure because go up the manufacturing materials of cap 1; Adopting Laser Welding will go up cap 1 is welded on the first metal layer 31; Owing to need cap 1 in the melting welding, thereby required welding energy is higher than the energy that passes second counterbore, 34 melting welding the first metal layers 31, if the caused temperature of this energy raises when surpassing the start-up temperature (80 ℃ ~ 100 ℃) of PTC body; Can cause PTC body 30 to expand; Make PTC body 30 interior conductive particles stagger each other, after welding is accomplished, though PTC body 30 can restore to the original state; But its internal resistance has been multiple to increase; Thereby, adopt non-counterbore to weld PTC and last cap or bursting diaphragm are welded, require very high to welding energy and temperature controlling; And through second counterbore, 34 melting welding the first metal layers 31, because the thickness of the first metal layer 31 is little, required welding energy is little, is not enough to cause the startup of PTC body, and operability is stronger, and welding effect is better.In addition, because the manufacturing materials of bursting diaphragm 4 is the aluminium material, thereby; Adopt Laser Welding that bursting diaphragm 4 and the required energy of second metal level, 32 welding are less than block 1 and the required energy of the first metal layer 31 welding; But this energy also is far longer than the energy through through hole 11, first counterbore, 33 melting welding, second metal level 32, and the temperature rise that welding causes still might surpass the start-up temperature (80 ℃ ~ 100 ℃) of PTC body, and; Because bursting diaphragm 4 has protection and effect such as explosion-proof concurrently; Directly welding bursting diaphragm 4 may impact the structure of bursting diaphragm 4, thus through through hole 11, first counterbore 33 with 32 melting welding of second metal level in bursting diaphragm 4; Its operability is stronger, and welding effect is better.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the cap assembly of a battery comprises: electrical connection module and the sealing ring that prevents that electrical connection module and battery case from electrically contacting of being used to of being located at the electrical connection module outside, and said electrical connection module comprises bursting diaphragm, PTC and the last cap of electrical connection successively; The said cap, PTC, bursting diaphragm gone up stacks gradually and places sealing ring, and the edge of said bursting diaphragm wraps up said PTC and last cap to upper overturning, also is provided with between last cap and the bursting diaphragm to be used to the insulated ring that prevents that cap and bursting diaphragm from electrically contacting;
It is characterized in that said PTC comprises the PTC body and be located at the first metal layer and second metal level on the upper and lower surface of PTC body, said the first metal layer welds with the said cap of going up mutually, and said second metal level welds with said bursting diaphragm mutually.
2. cap assembly according to claim 1; It is characterized in that; Said going up on the cap offers through hole, and the upper surface of said PTC offers first counterbore that communicates with said through hole, and said first counterbore passes the first metal layer and PTC body; The part that said second metal level is positioned at said first counterbore is first Welding Area, and said bursting diaphragm welds with said first Welding Area mutually.
3. cap assembly according to claim 1; It is characterized in that; The lower surface of said PTC offers second counterbore; Said second counterbore passes second metal level and PTC body, and the part that said the first metal layer is positioned at said second counterbore is second Welding Area, and the said cap of going up welds with said second Welding Area mutually.
4. according to any described cap assembly of claim 1-3, it is characterized in that the said cap of going up comprises the lug boss of being located at the middle part and the connecting portion that is provided with around this lug boss; Said through hole is opened in said connecting portion, and the diameter of through hole is less than the radial dimension of said connecting portion.
5. cap assembly according to claim 4 is characterized in that, said through hole is 1-6, the diameter of through hole be said connecting portion radial dimension 1/6 ~ 1/3.
6. cap assembly according to claim 4 is characterized in that, said through hole is two, and these two through holes are that the center is symmetrical set.
7. according to any described cap assembly of claim 1-3; It is characterized in that; Said PTC is ring-shaped P TC; Said first counterbore and second counterbore are respectively 1-6, the diameter of first counterbore and second counterbore be respectively said PTC radial dimension 1/6 ~ 1/3, the quantity and the size of the quantity of said first counterbore and size and said through hole are consistent.
8. cap assembly according to claim 7 is characterized in that, said first counterbore is two, the setting that is centrosymmetric of these two first counterbores.
9. cap assembly according to claim 8 is characterized in that, said second counterbore is two, the setting that is centrosymmetric of these two second counterbores; And the line of the line of two second counterbores and two first counterbores is 20-160 °.
10. lithium battery comprises: shell, the electric core and the electrolyte that are used for the cap assembly of closure and are positioned at the cavity that shell and cap assembly surround; Lead to first lug and second lug on the electricity core, wherein first lug is electrically connected with shell, and second lug is electrically connected with cap assembly; It is characterized in that said cap assembly adopts like any described cap assembly of claim 1-9.
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| CN201110073233.0A CN102694135B (en) | 2011-03-25 | 2011-03-25 | The cap assembly of a kind of battery and a kind of lithium battery |
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| CN201110073233.0A CN102694135B (en) | 2011-03-25 | 2011-03-25 | The cap assembly of a kind of battery and a kind of lithium battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934553A (en) * | 2015-06-12 | 2015-09-23 | 福建南平南孚电池有限公司 | Electrochemical secondary battery built with charging circuit |
| CN109103359A (en) * | 2018-07-20 | 2018-12-28 | 苏州橙柳电子精密有限公司 | A kind of battery cap |
| CN111542944A (en) * | 2017-12-05 | 2020-08-14 | 三星Sdi株式会社 | Secondary battery |
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| US20030198863A1 (en) * | 2002-04-19 | 2003-10-23 | Matsushita Electric Industrial Co., Ltd. | Cylindrical lithium ion secondary battery and fabrication method thereof |
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| CN201436692U (en) * | 2009-02-12 | 2010-04-07 | 上海比亚迪有限公司 | Cylindrical lithium secondary cell cap component and cell using the cap component |
| CN201532972U (en) * | 2009-09-25 | 2010-07-21 | 天津佰特瑞电子有限公司 | Lithium ion power battery cover for preventing internal resistance from drifting |
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| CN201994353U (en) * | 2011-03-25 | 2011-09-28 | 比亚迪股份有限公司 | Cap assembly of battery and lithium battery |
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| US20030198863A1 (en) * | 2002-04-19 | 2003-10-23 | Matsushita Electric Industrial Co., Ltd. | Cylindrical lithium ion secondary battery and fabrication method thereof |
| JP2004055372A (en) * | 2002-07-22 | 2004-02-19 | Matsushita Electric Ind Co Ltd | Sealed battery |
| CN201436692U (en) * | 2009-02-12 | 2010-04-07 | 上海比亚迪有限公司 | Cylindrical lithium secondary cell cap component and cell using the cap component |
| CN201532972U (en) * | 2009-09-25 | 2010-07-21 | 天津佰特瑞电子有限公司 | Lithium ion power battery cover for preventing internal resistance from drifting |
| CN102054943A (en) * | 2010-12-10 | 2011-05-11 | 深圳市前研动力电子科技有限公司 | Novel structural cylindrical lithium ion battery combined nut cap and battery |
| CN201994353U (en) * | 2011-03-25 | 2011-09-28 | 比亚迪股份有限公司 | Cap assembly of battery and lithium battery |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934553A (en) * | 2015-06-12 | 2015-09-23 | 福建南平南孚电池有限公司 | Electrochemical secondary battery built with charging circuit |
| CN111542944A (en) * | 2017-12-05 | 2020-08-14 | 三星Sdi株式会社 | Secondary battery |
| CN111542944B (en) * | 2017-12-05 | 2023-05-02 | 三星Sdi株式会社 | secondary battery |
| CN109103359A (en) * | 2018-07-20 | 2018-12-28 | 苏州橙柳电子精密有限公司 | A kind of battery cap |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102694135B (en) | 2016-11-09 |
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Effective date of registration: 20180524 Address after: 518116 Baolong Industrial Road, Baolong Industrial Park, Longgang District, Shenzhen, Guangdong, 3001, No. 3001 Patentee after: Shenzhen BYD Lithium Battery Co., Ltd. Address before: 518118 BYD Road, Pingshan New District, Shenzhen, Guangdong 3009 Patentee before: Biyadi Co., Ltd. |
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