CN102694135B - The cap assembly of a kind of battery and a kind of lithium battery - Google Patents
The cap assembly of a kind of battery and a kind of lithium battery Download PDFInfo
- Publication number
- CN102694135B CN102694135B CN201110073233.0A CN201110073233A CN102694135B CN 102694135 B CN102694135 B CN 102694135B CN 201110073233 A CN201110073233 A CN 201110073233A CN 102694135 B CN102694135 B CN 102694135B
- Authority
- CN
- China
- Prior art keywords
- ptc
- counterbore
- cap assembly
- cap
- bursting diaphragm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention provides the cap assembly of a kind of battery, and including: electrical connection module and be located at the sealing ring outside electrical connection module, described electrical connection module includes bursting diaphragm, PTC and the upper cap being sequentially connected electrically；Described upper cap, PTC, bursting diaphragm stack gradually and are placed in sealing ring, and the edge of described bursting diaphragm wraps up described PTC and upper cap to upper overturning, is additionally provided with insulated ring between upper cap and bursting diaphragm；Wherein, described PTC includes PTC body and the first metal layer being located at the upper and lower surface of PTC body and the second metal level, and described the first metal layer welds mutually with described upper cap, and described second metal level welds mutually with described bursting diaphragm.It addition, present invention also offers a kind of lithium battery using above-mentioned cap assembly.The cap assembly of the present invention is during the life-time service of battery, and resistance value will not occur drift or rising.
Description
Technical field
The present invention relates to field of batteries, particularly relate to a kind of cap assembly and use the lithium battery of this cap assembly.
Background technology
Along with the fast development of IT industry, desktop computer has shifted towards the notebook computer of light and handy Portable belt, the digital product of small volume and less weight of all kinds, the most gradually instead of traditional product such as digital camera, camera etc..And these Related product power resources are all chargeable chemical cells (mainly applies column lithium ion battery, such as circular 1865 types etc., advantage be circular batteries than square cell body amass little, assemble easy to make), and demand cumulative year after year, the quality of battery directly affects the performance of this product.
As battery used by the said goods, compared with traditional lead-acid battery, Ni-MH battery, column lithium ion battery with its high power capacity, have extended cycle life, pollution-free, running voltage is high, safety is good etc., and series of advantages is highly valued, achieving fast development, battery used by digital product is essentially all lithium ion battery.
Existing lithium battery is made up of shell, battery core, cap assembly.Wherein, one end of shell is provided with opening, and battery core is wound by positive plate, barrier film and negative plate and formed, it is placed in shell and is drawn by the first lug, the second lug, wherein the first lug electrically connects with shell, and the second lug electrically connects with cap assembly, is also injected with electrolyte in shell；During charging, lithium ion is embedded negative pole by positive pole abjection by electrolyte, barrier film, and during electric discharge, lithium ion is embedded into positive pole by negative pole abjection by electrolyte, barrier film.It is noted that cap assembly is for sealing the opening of shell, have sealing and protective effect concurrently.As it is shown in figure 1, existing cap assembly, including electrical connection module be located at the sealing ring 7' outside electrical connection module, electrical connection module includes orifice plate 6', bursting diaphragm 4', PTC 3' and the upper cap 1' being sequentially connected electrically；Described upper cap 1', PTC 3', bursting diaphragm 4', orifice plate 6' stack gradually and are placed in sealing ring 7', described PTC 3' and upper cap 1' is wrapped up to upper overturning by the edge of bursting diaphragm 4', the insulated ring 2' for preventing upper cap 1' and bursting diaphragm 4' electrical contact it is additionally provided with between described upper cap 1' and bursting diaphragm 4', being additionally provided with orifice plate packing ring 5' between bursting diaphragm 4' and orifice plate 6', PTC 3' tightly fits between cap 1' and bursting diaphragm 4'.This compound mode is that contact is fixed in lamination bending, the cap assembly of this compound mode uses in lithium battery, during the life-time service of lithium battery, owing to external shock and fixture (such as bursting diaphragm) are aging, loose contact is there will be between upper cap 1', bursting diaphragm 4' and PTC 3', contacting internal resistance the phenomenon of drift or rising can occur between upper cap 1', bursting diaphragm 4' and PTC 3', ultimately result in self-discharge of battery big, during use, heating is serious, cause internal short-circuit of battery or on fire what is more, cause bigger security incident.
Summary of the invention
The technical problem to be solved in the present invention is in the cap assembly of battery in the prior art, PTC and upper cap are fixed to upper overturning parcel by the edge of bursting diaphragm, PTC fits between cap and bursting diaphragm, owing to external shock and fixture are aging, contacting internal resistance the technical problem of drift or rising can occur between upper cap, bursting diaphragm and PTC.
In order to solve above-mentioned technical problem, the present invention provides the cap assembly of a kind of battery, including: including: electrical connection module and be located at the sealing ring for preventing the electrical contact of electrical connection module and battery case outside electrical connection module, described electrical connection module includes bursting diaphragm, PTC and the upper cap being sequentially connected electrically；Described upper cap, PTC, bursting diaphragm stack gradually and are placed in sealing ring, and the edge of described bursting diaphragm wraps up described PTC and upper cap to upper overturning, are additionally provided with the insulated ring for preventing upper cap and bursting diaphragm electrical contact between upper cap and bursting diaphragm；Wherein, described PTC includes PTC body and the first metal layer being located at the upper and lower surface of PTC body and the second metal level, and described the first metal layer welds mutually with described upper cap, and described second metal level welds mutually with described bursting diaphragm.
At described cap assembly, preferably, through hole is offered on described upper cap, the upper surface of described PTC offers the first counterbore communicated with described through hole, described first counterbore passes the first metal layer and PTC body, it is the first Welding Area that described second metal level is positioned at the part of described first counterbore, and described bursting diaphragm welds mutually with described first Welding Area.
At described cap assembly, preferably, the lower surface of described PTC offers the second counterbore, and described second counterbore passes the second metal level and PTC body, it is second point welding zone that described the first metal layer is positioned at the part of described second counterbore, and described upper cap welds mutually with described second point welding zone.
At described cap assembly, it is preferable that described upper cap includes the lobe being located at middle part and the connecting portion arranged around this lobe；Described through hole is opened in described connecting portion, and the diameter of through hole is less than the radial dimension of described connecting portion.
At described cap assembly, it is preferable that described through hole is 1-6, radial dimension of the 1/6 ~ 1/3 of a diameter of described connecting portion of through hole.
At described cap assembly, it is preferable that described through hole is two, it is symmetrical arranged centered by these two through holes.
At described cap assembly, preferably, it is characterized in that, described PTC is ring-shaped P TC, described first counterbore and the second counterbore are respectively 1-6, the diameter of the first counterbore and the second counterbore is respectively radial dimension of the 1/6 ~ 1/3 of described PTC, and quantity and the size of described first counterbore are consistent with the quantity of described through hole and size.
At described cap assembly, it is preferable that described first counterbore is two, these two first counterbores are centrosymmetric setting.
At described cap assembly, it is preferable that described second counterbore is two, these two second counterbores are centrosymmetric setting；And the line of the line of two the second counterbores and two the first counterbores is 20-160 °.
It addition, present invention also offers a kind of lithium battery, including: shell, for the cap assembly of closure and be positioned at shell and the battery core of cavity that cap assembly is surrounded and electrolyte；Leading to the first lug and the second lug in battery core, wherein the first lug electrically connects with shell, and the second lug electrically connects with cap assembly；Described cap assembly uses cap assembly as above.
The first metal layer of PTC upper surface is welded mutually by the cap assembly of the present invention with described upper cap, second metal level of PTC lower surface welds mutually with described bursting diaphragm, owing to being connected for welding manner between PTC with upper cap, bursting diaphragm, reduce the resistance value of cap assembly itself, and welding type connection makes cap assembly during the battery later stage uses for a long time, will not be aging because of external shock and fixture, contact surface loose contact and make resistance value generation drift or the rising of cap assembly.
Accompanying drawing explanation
Fig. 1 is the sectional view of the cap assembly of lithium battery of the prior art.
Fig. 2 is the sectional view of the cap assembly of the lithium battery of the preferred embodiment of the present invention.
Fig. 3 is the perspective exploded view of the cap assembly shown in Fig. 2.
Fig. 4 is the front view of the PTC shown in Fig. 2.
Fig. 5 is the sectional view along A-A direction of the PTC shown in Fig. 4.
Fig. 6 is the sectional view along B-B direction of the PTC shown in Fig. 4.
Fig. 7 is the sectional view of the lithium battery of the preferred embodiment of the present invention.
Detailed description of the invention
The detailed description of the invention of the present invention is specifically described below in conjunction with Figure of description.
As it is shown in fig. 7, the invention provides a kind of lithium battery, including shell 20, cap assembly 10 and be positioned at shell 20 and the battery core 30 of the surrounded cavity of cap assembly 10 and electrolyte；Leading to the first lug and the second lug (not shown) in battery core 30, wherein the first lug electrically connects with shell 20, and the second lug electrically connects with cap assembly 10.
In the present invention, the positive and negative polarity for the first lug, the second lug is not particularly limited, and i.e. cap assembly 10 is connected with positive electrical or is connected with negative electricity and is not particularly limited.Such as: can the first lug be positive pole, the second lug be negative pole；Also can the first lug be negative pole, the second lug be positive pole.Under normal circumstances, the first lug is negative pole, and the second lug is positive pole；I.e. shell 20 is connected with negative electricity, and cap assembly 10 is connected with positive electrical.
In the lithium battery of the present invention, the most so-called positive plate of battery core 30, barrier film, negative plate are rolled or some stacked and that the formed assembly that provide electric energy are repeated several times.Drawing positive pole ear in battery core 30 on positive plate, negative plate is drawn negative lug, positive pole ear, negative lug electrically connect with shell 20, cap assembly 10 by the way of welding respectively again.The most known to those skilled in the art as positive plate, negative plate, the manufacture method of barrier film, and other technology for manufacturing electric core etc., therefore repeat no more.
The assembling of the lithium battery of the present invention can be carried out as follows: membrane winding positive plate and negative plate form battery core 30, and battery core 30 is inserted shell 20 inner chamber, and positive plate, negative plate lead to lug respectively, are connected with shell 20, cap assembly 10 respectively by leader；Reinject electrolyte dipping battery core, subsequently, cap assembly 10 is sealed with the shell 20 equipped with battery core 30, get final product the lithium battery of the present invention；The lithium battery of the present invention is the lithium battery using the cap assembly 10 improved, and the concrete of cap assembly 20 is improved as detailed below.
The cap assembly of the preferred embodiment of the present invention is the cap assembly of cylinder type lithium battery, its structure is as shown in Figures 2 and 3, including electrical connection module and be located at the sealing ring 7 for preventing the electrical contact of electrical connection module and battery case outside electrical connection module, electrical connection module includes orifice plate 6, bursting diaphragm 4, PTC 3 and the upper cap 1 being sequentially connected electrically from bottom to up；Described upper cap 1, PTC 3, bursting diaphragm 4 stack gradually and are placed in sealing ring 7, and the edge of described bursting diaphragm 4 wraps up described PTC 3 and upper cap 1 to upper overturning, are additionally provided with the insulated ring 2 for preventing upper cap 1 and bursting diaphragm 4 electrical contact between upper cap 1 and bursting diaphragm 4.
On the one hand the structure of described sealing ring 7 and be shaped as known to one of skill in the art, its role is to, for filling the space between shell 20 and cap assembly 10, prevent battery leakage；On the other hand, for insulation crust 20 and cap assembly 10, battery short circuit is prevented.
Described orifice plate 6 is positioned between the second lug (not shown) and bursting diaphragm 4, the structure of orifice plate 6 and be shaped as known to one of skill in the art, the lower surface of orifice plate 6 and the electrical connection of the second lug, the middle part of orifice plate 6 upper surface realizes electrically connecting by multi-point welding with the recessed portion in the middle part of bursting diaphragm 4；Orifice plate 6 is provided with first row pore, and upper cap 1 is provided with second row pore.As the common knowledge of those skilled in the art, first row pore, the number of second row pore are not particularly limited, and can be one or more, and the gas of inside battery can pass through the first row pore on orifice plate 6, the second row pore on upper cap 1 discharges battery.It addition, be additionally provided with orifice plate packing ring 5 between bursting diaphragm 4 and orifice plate 6, described orifice plate packing ring 5 is located at orifice plate 6 upper surface periphery, and the recessed portion in the middle part of described bursting diaphragm 4 welds through orifice plate packing ring 5 mutually with the middle part of orifice plate 6 upper surface.
Refering to Fig. 2, described insulated ring 2 is arranged at the periphery of cap 1, and the periphery of bursting diaphragm 4 wraps up described insulated ring 2 to upper overturning, is used for preventing bursting diaphragm 4 from directly electrically connecting with upper cap 1.Insulated ring 2, orifice plate packing ring 5 all can use high temperature fluoroplastics packing ring commonly used in the art, it is preferred to use perfluoroalkoxy resin (PFA), and when can prevent battery high-temperature, packing ring softens, melts and cause cap assembly power-off failure.
As Figure 4-Figure 6, described PTC 3 includes: PTC body 30 and lay respectively at first, second metal level 31,32 on the upper and lower surface of PTC body 30；Wherein, described first, second metal level 31,32 can be made up of any conductive material, preferably nickel foil layer or aluminium foil layer；The thermally sensitive macromolecule polymer material that described PTC body 30 can be known to the skilled person, such as: can be formed by the conducting particles of 57wt% high density polyethylene (HDPE), 3wt% ethylene-ethyl acrylate copolymer and 40wt% is mixing at 160-190 DEG C；Then this mixing thing is clamped with nickel foil or aluminium foil, with hot press at 190 DEG C, 5kg/cm2, hot-forming under conditions of 60 seconds i.e. can get PTC 3.
PTC 3(Positive Temperature is set between upper cap 1 and bursting diaphragm 4
Coefficient semistor), by PTC 3, the sensitivity of temperature is fed back inside battery abnormal conditions in time.PTC 3 primarily serves the effect of overcurrent protection and overtemperature protection; the structure of PTC 3 is the most known to those skilled in the art; in the cylindrical lithium ion battery of the present embodiment, using ring-type PTC, electric current passes sequentially through orifice plate 6, bursting diaphragm 4, PTC 3 and upper cap 1.When loading current is too high; when the temperature of PTC body 30 is higher than start-up temperature (80 DEG C ~ 100 DEG C) of PTC body 30; polymer crystallite fusing in PTC body 30 becomes the state of indefinite form; in fusion process, PTC body 30 expands; conductive particle is mutually staggered; cause that internal resistance is nonlinear drastically to be raised, thus limit by electric current, play a protective role.
The edge of described bursting diaphragm 4 can bending, as the common knowledge of those skilled in the art, bursting diaphragm 4 has circular score line, when inside battery air pressure is excessive, bursting diaphragm 4 ruptures at indentation, prevents inside battery gases at high pressure from draining rapidly, it is to avoid aerofluxus causes battery explosion not in time.
Refering to Fig. 1, in the prior art, PTC 3' tightly fits between cap 1' and burst disk 4', wherein, the first metal layer of PTC 3' upper surface contacts with upper cap, and the second metal level of PTC 3' lower surface contacts with bursting diaphragm, and this way of contact is during the use that battery is long-term, can cause contacting internal resistance generation drift or rising due to external shock or bursting diaphragm is aging causes PTC 3' and upper cap 1', the loose contact of bursting diaphragm 4'.Thus, in the present invention, described the first metal layer 31 is welded with described upper cap 1 phase, described second metal level 32 welds with described bursting diaphragm 4 phase, it is connected for welding manner between PTC 3 with upper cap 1, bursting diaphragm 4, reduce the resistance value of cap assembly itself, and welding type connection makes cap assembly during the battery later stage uses for a long time, will not be aging because of fixture (such as bursting diaphragm 4), contact surface loose contact (as loosened or oxidation) and makes resistance value generation drift or the rising of cap assembly.
Refering to Fig. 2-6, in the present embodiment, the first metal layer 31 of described PTC 3 and described upper cap 1 weld and second metal level 32 of PTC 3 is welded with described bursting diaphragm 4 phase and is realized by counterbore welding, specifically, through hole 11 is offered on cap 1 on described, described upper cap 1 can use the upper cap of existing structure, including the lobe 12 being located at middle part and the connecting portion 13 arranged around this lobe 12, described lobe 12 is used as to draw the connecting portion of battery electrode, and described connecting portion 13 is for contacting with PTC 3.Described through hole 11 is opened on described connecting portion 13, is not particularly limited the quantity of through hole 11, can be one or more, and the diameter of through hole 11 is less than the radial dimension of described connecting portion 13；In order to ensure that the setting of through hole 11 does not affect the electrical connection of upper cap 1 and PTC 3, it is preferable that the quantity of described through hole 11 is 1-6, radial dimension of the 1/6 ~ 1/3 of a diameter of described connecting portion 13 of through hole 11；It is highly preferred that as in figure 2 it is shown, described through hole 11 is two, be centrosymmetric setting, to facilitate para-position and welding.
Refering to Fig. 4 and Fig. 5, described PTC 3 is ring-shaped P TC, and the upper surface 31 of PTC 3 offers the first counterbore 33, and described first counterbore 33 is correspondingly arranged with described through hole 11, and described first counterbore 33 is through the first metal layer 31 and PTC body 30, retains the second metal level 32 the most impaired simultaneously.The quantity of the first counterbore 33 is not particularly limited, can be one or more, it is preferable that described first counterbore 33 is 1-6, radial dimension of the 1/6 ~ 1/3 of a diameter of described PTC 3 of the first counterbore 33.Owing to requiring that described first counterbore 33 is correspondingly arranged with described through hole 11 and connects, thus the quantity of described first counterbore 33 and size should be consistent with the quantity of described through hole 11 and size, as shown in Figure 2-5, in the present embodiment, described first counterbore 33 is two, these two the first counterbores 33 are centrosymmetric setting, are correspondingly arranged with two described through holes 11 and communicate respectively.
Refering to Fig. 4 and Fig. 6, the lower surface of described PTC 3 offers the second counterbore 34, and described second counterbore 34, through the second metal level 32 and PTC body 30, retains the first metal layer 31 the most impaired simultaneously.The quantity of the second counterbore 34 is not particularly limited, can be one or more, preferably, described second counterbore 34 is 1-6, radial dimension of the 1/6 ~ 1/3 of a diameter of described PTC 3 of the second counterbore 34, and the second counterbore 34 is 20-160 with the line at PTC 3 center and the line at the first counterbore 33 and PTC 3 center, it is simple to the first counterbore and the setting of the second counterbore, to avoid interference with.In the present embodiment, described second counterbore 34 is two, and these two the second counterbores 34 are centrosymmetric setting, and the line of the line of these two the second counterbores 34 and two the first counterbores 33 is 90 °.
The assembling of the cap assembly of the present embodiment can be carried out as follows: 1), by upper cap 1 and PTC 3 overlap, two the first counterbores 33 making offer on cap 1 two through holes 11 offer with PTC 3 upper surface are corresponding and connect, then the second counterbore 34 offered by PTC 3 lower surface is welded, owing to the second counterbore 34 is through the second metallic plate 32 and PTC body 30, welded by described second counterbore 34, described the first metal layer 31 can be made to weld with described upper cap 1 phase.More specifically, it is second point welding zone 311 that described the first metal layer 31 is positioned at the part of described second counterbore 34, by above-mentioned welding, described upper cap 1 welds with described second point welding zone 311 phase, in the present embodiment, described upper cap 1 is directly connected to by welding formation with two the second point welding zones 311 on the first metal layer 31 of PTC 3.2), will buckle the edge of cap 1 and PTC 3 in insulated ring 2, the edge of described bursting diaphragm 4 wraps up insulated ring 2 and the PTC 3 being welded to connect and upper cap 1 to upper overturning；3), two the first counterbores 33 offered with PTC 3 upper surface due to two through holes 11 offered on upper cap 1 are corresponding and connect, and owing to described first counterbore 33 is through the first metal layer 31 and PTC body 30, by described through hole 11, first counterbore 33 welds, described second metal level 32 is welded with described bursting diaphragm 4 phase, more specifically, it is the first Welding Area 321 that described second metal level 32 is positioned at the part of described first counterbore 33, by above-mentioned welding, described bursting diaphragm 4 welds with described first Welding Area 321 phase, by above-mentioned steps by upper cap 1, PTC 3, bursting diaphragm 4 is welded as a whole；4), again orifice plate 6 and orifice plate packing ring 5 combination after be welded to bursting diaphragm 4 opposite side, then the electrical connection module combined is put into sealing ring 7, obtains cap assembly.
In the present invention, in cap assembly, electrical connection between electrical connection module is contacting of face and face, can be welded by common electric welding mode or Laser Welding, electron beam or ratio-frequency welding welding can also be passed through, further, the first metal layer 31 welds with described upper cap 1, and described second metal level 32 also can pass through electron beam or ratio-frequency welding welding with welding of described bursting diaphragm 4, thus the adhesion between cap assembly can be improved, effectively reduce the internal resistance of cap assembly；It addition, use electron beam or the electric connection mode of ratio-frequency welding, high-frequency vibration, fall, rollover test time can effectively prevent from cap assembly from destroyed by external force causing internal resistance to be drifted about.
Compared with existing block molectron, owing to the cap assembly of the preferred embodiment of the present invention has the advantage that
One, owing to being all welded to connect between electrical connection module, especially go up and connect for welding manner between cap, PTC, bursting diaphragm, reduce the resistance of cap assembly itself, refering to table 1:
Table 1
Two, the welding type connection between upper cap, PTC, bursting diaphragm makes cap assembly during the battery later stage uses for a long time, will not loosen because of the aging contact surface of fixture and aoxidize and make resistance generation drift or the rising of cap assembly；Further, this cap assembly is in battery, it is possible to be effectively prevented self-discharge of battery big, and releasing capacity is low and the heating of use process seriously causes internal short-circuit and phenomenon on fire.
It is understandable that, as long as described the first metal layer 31 can be welded with described upper cap 1 phase, described second metal level 32 welds with described bursting diaphragm 4 phase, makes cap 1, PTC 3, bursting diaphragm 4 shape all-in-one-piece welding manner be used equally to the present invention, it is not limited to the mode of above preferred embodiment.nullSuch as: in other embodiments of the invention，The second counterbore 34 can not be offered on second metal level 32 of PTC 3，Welding between the first metal layer 31 with described upper cap 1 is not realized by the second counterbore 34，But can directly upper cap 1 be welded on the first metal layer 31，But which is higher to the requirement of welding procedure，Because the material that making material is ferrum nickel plating of upper cap 1，Laser Welding is used to be welded on the first metal layer 31 by upper cap 1，Due to cap 1 in needs melting welding，Thus required welding energy is higher than the energy through the second counterbore 34 melting welding the first metal layer 31，If the temperature caused by this energy increases to over start-up temperature (80 DEG C ~ 100 DEG C) of PTC body，PTC body 30 can be caused to expand，In making PTC body 30, conductive particle mutually staggers，After having welded，Although PTC body 30 can restore to the original state，But its internal resistance increases in multiple，Thus，Use the weldering of non-counterbore that PTC is welded with upper cap or bursting diaphragm，Control to welding energy and temperature requires the highest；And by the second counterbore 34 melting welding the first metal layer 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 higher, and welding effect is more preferably.Additionally, because the making material of bursting diaphragm 4 is aluminum material, thus, use Laser Welding that bursting diaphragm 4 welds required energy with the second metal level 32 to be less than with the first metal layer 31, block 1 is welded required energy, but this energy is also far longer than by through hole 11, the energy of first counterbore 33 melting welding the second metal level 32, the temperature rise that welding causes is the most likely more than the start-up temperature (80 DEG C ~ 100 DEG C) of PTC body, and, have protection concurrently due to bursting diaphragm 4 and explosion-proof grade acts on, directly welding bursting diaphragm 4, the structure of bursting diaphragm 4 may be impacted, thereby through through hole 11, first counterbore 33 by the second metal level 32 melting welding in bursting diaphragm 4, its operability is higher, welding effect is more preferably.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (9)
1. a cap assembly for battery, including: electrical connection module and be located at being electrically connected for preventing outside electrical connection module
The sealing ring that connected components makes electrical contact with battery case, described electrical connection module includes bursting diaphragm, PTC and the upper cap being sequentially connected electrically；
Described upper cap, PTC, bursting diaphragm stack gradually and are placed in sealing ring, and the edge of described bursting diaphragm wraps up described PTC to upper overturning
With upper cap, between upper cap and bursting diaphragm, it is additionally provided with the insulated ring for preventing upper cap and bursting diaphragm electrical contact；
It is characterized in that, described PTC includes PTC body and is located at the first metal layer and second on the upper and lower surface of PTC body
Metal level, described the first metal layer welds mutually with described upper cap, and described second metal level welds mutually with described bursting diaphragm, described on
Offering through hole on cap, the upper surface of described PTC offers the first counterbore communicated with described through hole, and described first counterbore is worn
Crossing the first metal layer and PTC body, it is the first Welding Area that described second metal level is positioned at the part of described first counterbore, institute
State bursting diaphragm to weld mutually with described first Welding Area.
Cap assembly the most according to claim 1, it is characterised in that the lower surface of described PTC offers the second counterbore,
Described second counterbore passes the second metal level and PTC body, and described the first metal layer is positioned at the part of described second counterbore and is
Second point welding zone, described upper cap welds mutually with described second point welding zone.
3. according to the cap assembly described in claim 1-2 any one, it is characterised in that described upper cap includes being located at middle part
Lobe and the connecting portion that arranges around this lobe；Described through hole is opened in described connecting portion, and the diameter of through hole is less than described
The radial dimension of connecting portion.
Cap assembly the most according to claim 3, it is characterised in that described through hole is 1-6, through hole a diameter of
Radial dimension of the 1/6～1/3 of described connecting portion.
Cap assembly the most according to claim 3, it is characterised in that described through hole is two, during these two through holes are
The heart is symmetrical arranged.
6. according to the cap assembly described in claim 1-2 any one, it is characterised in that described PTC is ring-shaped P TC,
Described first counterbore and the second counterbore are respectively 1-6, and the diameter of the first counterbore and the second counterbore is respectively the radial direction of described PTC
The 1/6～1/3 of size, quantity and the size of described first counterbore are consistent with the quantity of described through hole and size.
Cap assembly the most according to claim 6, it is characterised in that described first counterbore is two, these two first
Counterbore is centrosymmetric setting.
Cap assembly the most according to claim 7, it is characterised in that described second counterbore is two, these two second
Counterbore is centrosymmetric setting；And the line of the line of two the second counterbores and two the first counterbores is 20-160 °.
9. a lithium battery, including: shell, for the cap assembly of closure and be positioned at shell and cap assembly is enclosed
Battery core in the cavity become and electrolyte；Leading to the first lug and the second lug in battery core, wherein the first lug is electrically connected with shell
Connecing, the second lug electrically connects with cap assembly；It is characterized in that, described cap assembly uses such as claim 1-8 any one
Described cap assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110073233.0A CN102694135B (en) | 2011-03-25 | 2011-03-25 | The cap assembly of a kind of battery and a kind of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110073233.0A CN102694135B (en) | 2011-03-25 | 2011-03-25 | The cap assembly of a kind of battery and a kind of lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102694135A CN102694135A (en) | 2012-09-26 |
| CN102694135B true CN102694135B (en) | 2016-11-09 |
Family
ID=46859472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110073233.0A Expired - Fee Related CN102694135B (en) | 2011-03-25 | 2011-03-25 | The cap assembly of a kind of battery and a kind of lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102694135B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934553B (en) * | 2015-06-12 | 2017-08-25 | 福建南平南孚电池有限公司 | A kind of electrochemical secondary cell for being built in charging circuit |
| KR102520538B1 (en) * | 2017-12-05 | 2023-04-11 | 삼성에스디아이 주식회사 | 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4207451B2 (en) * | 2002-04-19 | 2009-01-14 | パナソニック株式会社 | Cylindrical lithium ion secondary battery and manufacturing method thereof |
| JP4244580B2 (en) * | 2002-07-22 | 2009-03-25 | パナソニック株式会社 | Sealed battery |
-
2011
- 2011-03-25 CN CN201110073233.0A patent/CN102694135B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102694135A (en) | 2012-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100477750B1 (en) | Electorde assembly for lithium ion cell and lithium ion cell using the same | |
| CN103227310B (en) | Rectangular secondary cell | |
| CN101271985B (en) | Rechargeable battery and manufacturing method thereof | |
| CN103155225B (en) | Cap assembly and the cylindrical battery utilizing this cap assembly of new structure | |
| JP4187685B2 (en) | Secondary battery | |
| CN101312244B (en) | Electrode assembly and secondary battery using the electrode assembly | |
| KR100399783B1 (en) | Secondary battery and the fabrication method therof | |
| KR101255171B1 (en) | secondary battery and manufacturing method thereof | |
| US20170033325A1 (en) | Rechargeable battery including multiple cases | |
| WO2007076693A1 (en) | Secondary batery | |
| KR20140087773A (en) | Pouch type secondary battery with enhanced stability | |
| KR100914115B1 (en) | Secondary battery | |
| CN113488692A (en) | Button cell explosion-proof sealing structure, button cell and packaging method thereof | |
| KR20050110460A (en) | Secondary battery and electrodes assembly using the same | |
| CN103392257B (en) | Lithium ion battery | |
| CN102694135B (en) | The cap assembly of a kind of battery and a kind of lithium battery | |
| CN102544397B (en) | A kind of lithium rechargeable battery | |
| JP2024527763A (en) | Secondary battery safety evaluation jig | |
| CN201994353U (en) | Cap assembly of battery and lithium battery | |
| KR101310486B1 (en) | Seal tape and secondary battery comprising the same | |
| JP2022540538A (en) | Cylindrical battery and method of manufacturing cylindrical battery | |
| JP2006228520A (en) | Secondary battery | |
| KR20030044512A (en) | Secondary battery | |
| JP2003022794A (en) | Non-aqueous electrolyte secondary battery and production process thereof | |
| WO2022152126A1 (en) | Button cell having safety device and manufacturing method for button cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 Termination date: 20210325 |