CN209658243U - Secondary cell cap assembly and secondary cell - Google Patents
Secondary cell cap assembly and secondary cell Download PDFInfo
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- CN209658243U CN209658243U CN201920470072.0U CN201920470072U CN209658243U CN 209658243 U CN209658243 U CN 209658243U CN 201920470072 U CN201920470072 U CN 201920470072U CN 209658243 U CN209658243 U CN 209658243U
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- lamina tecti
- secondary cell
- hole
- extension
- cap assembly
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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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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model relates to a kind of secondary cell cap assembly and secondary cells, wherein cap assembly includes lamina tecti (3), is equipped with through-hole (31)；Electrode terminal (1) covers through-hole (31)；Lower insulation plate (5) is at least partially disposed at the side of lamina tecti (3) far from electrode terminal (1)；Sealing element (2) is at least partially disposed between lamina tecti (3) and electrode terminal (1)；With insulating part (4), it is at least partially disposed between lamina tecti (3) and lower insulation plate (5)；Wherein, insulating part (4) and sealing element (2) surround jointly through-hole (31) side wall and lamina tecti (3) upper and lower surface close to through-hole (31) region.By increasing insulating part between lamina tecti and lower insulation plate, the creepage distance between lamina tecti and electrode terminal can be increased, when electrode assembly is abnormal situation and electrion occurs, equivalent to increase the safe distance of inside battery, the safety of battery work can be improved.
Description
Technical field
The utility model relates to battery technology field more particularly to a kind of secondary cell cap assemblies and secondary cell.
Background technique
Due to lithium ion battery have energy density is high, power density is high, be recycled often, storage time it is long etc. excellent
Point, it is commonly used on electric car.About between 300V~900V, battery core is being abnormal Full Vehicle System voltage at present
In the case where, it may appear that internal circuit disconnects or fuse portion disconnects, and at this moment battery core can bear the high back voltage of system, due to interior
The inadequate battery core of the safe distance in portion will appear on fire, the security risks such as explosion.
A kind of prior art that inventor is known uses structure shown in FIG. 1, and the cap assembly of battery includes: electrode tip
Sub- 1a, sealing ring 2a, lamina tecti 3a and electrical insulating board 4a, lamina tecti 3a are equipped with through-hole, and electrode terminal 1a is on lamina tecti 3a
Side's covering through-hole, lower insulation plate 4a are located at below lamina tecti 3a, and lower insulation plate 4a is with extending to electrode terminal across through-hole
The extension of the bottom 1a, sealing ring 2a are located in the space that electrode terminal 1a, lamina tecti 3a and extension top are enclosed.Even
Fitting 5a raises upward to be connected electrode assembly with electrode terminal 1a in through hole.But such battery is actually using
Security risks are higher in the process.
Utility model content
The embodiments of the present invention provide a kind of secondary cell cap assembly and secondary cell, can be improved secondary electricity
Safety of the pond when electrion occurs.
One side according to the present utility model provides a kind of secondary cell cap assembly, comprising:
Lamina tecti is equipped with through-hole；
Electrode terminal covers through-hole；
Lower insulation plate is at least partially disposed at side of the lamina tecti far from electrode terminal；
Sealing element is at least partially disposed between lamina tecti and electrode terminal；With
Insulating part is at least partially disposed between lamina tecti and lower insulation plate；
Wherein, the side wall and lamina tecti upper and lower surface that insulating part and sealing element surround through-hole jointly are close to the region of through-hole.
In some embodiments, sealing element is cyclic structure, comprising:
It first, is located between lamina tecti and electrode terminal；With
Second, the contour dimension of cross section is less than first, and second position is in insulating part close to the one of through hole center
Side, and contacted with insulating part.
In some embodiments, insulating part is cyclic structure, comprising:
Third portion, is located between lamina tecti and lower insulation plate；With
4th, the contour dimension of cross section is less than third portion, and the 4th outer surface is bonded with the side wall of through-hole, and
4th top surface is not less than the upper surface that lamina tecti is contacted with sealing element.
In some embodiments, insulating part is cyclic structure, comprising:
Third portion, is located between lamina tecti and lower insulation plate；With
4th, the contour dimension of cross section is less than third portion, and the 4th outer surface is bonded with the side wall of through-hole, and
4th top surface is higher than the most bottom surface of sealing element.
In some embodiments, concave-convex fit structure is equipped between sealing element and insulating part.
In some embodiments, sealing element is cyclic structure, comprising: first and second, first is located at lamina tecti
Between electrode terminal；The contour dimension of second cross section is less than first, and second position is in insulating part in through-hole
The side of the heart, and contacted with insulating part；
Insulating part is cyclic structure, comprising: third portion and the 4th, third portion is located between lamina tecti and lower insulation plate；
The contour dimension of 4th cross section is less than third portion, and the 4th outer surface is bonded with the side wall of through-hole；
Wherein, first bottom surface is equipped with groove, and the 4th top insertion groove forms concave-convex fit structure.
In some embodiments, the 4th top is straight wall section；Or
4th top has bending segment, and the side that bending segment is directed away from second extends, and fits in lamina tecti
The upper surface contacted with sealing element.
In some embodiments, lower insulation plate includes the first main part and cricoid extension being connected to each other, extension
It extends to through-hole and is at least partially disposed in through-hole, second bottom end is mutually abutted with the top of extension.
In some embodiments, the face that extension is contacted with second is horizontal plane；Or
The face that extension is contacted with second tilts gradually downward from the inside of through-hole to outside；Or
The outer on the top of extension is equipped with annular groove, and second bottom end is connected in annular groove.
In some embodiments, lower insulation plate includes the first main part and cricoid extension being connected to each other, extension
It extends to through-hole and is at least partially disposed in through-hole, second position is between insulating part and extension, and extension and second
Contact.
In some embodiments, the top of extension extend to reach electrode terminal bottom surface, and at electrode terminal bottom surface
In contactless state.
In some embodiments, the outside of extension and the first main part junction is equipped with lug boss, and second to downward
It extends to and is tightly connected with lug boss.
In some embodiments, lug boss includes the oblique angle for being located at extension and the first main part junction；Or
Lug boss includes the step for being located at extension and the first main part junction.
In some embodiments, third portion is located between lamina tecti and lower insulation plate, and third portion, lamina tecti and lower insulation
Cavity is formed between plate.
In some embodiments, third portion is equipped with protrusion, and lamina tecti is equipped with matching hole, and protrusion and matching hole cooperation will
Third portion is fixed with lamina tecti.
In some embodiments, at least one of lamina tecti and lower insulation plate are equipped with holding tank, and third portion is located at receiving
In slot, lamina tecti is contacted with region of the lower insulation plate other than holding tank.
Another aspect according to the present utility model provides a kind of secondary cell, comprising:
Shell；
Electrode assembly is located in shell；With
The secondary cell cap assembly of above-described embodiment is located above electrode assembly, and closes shell.
In some embodiments, secondary cell further includes connector, and connector is equipped with protrusion, and protrusion protrudes into through-hole
It is electrically connected with electrode terminal；
Lower insulation plate bottom is equipped with concave portion, and connector is located in concave portion, and the bottom surface of concave portion is equipped with boss, boss
Bottom surface is contacted with connector.
Based on the above-mentioned technical proposal, the secondary cell cap assembly of the utility model one embodiment, by lamina tecti
Increase insulating part between lower insulation plate, the creepage distance between lamina tecti and electrode terminal can be increased, occurs in electrode assembly
When electrion occur in abnormal conditions, equivalent to increase the safe distance inside secondary cell, it is on fire that battery core generation can be reduced
A possibility that risks such as explosion, improves the safety of secondary cell work.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of secondary cell in the prior art；
Fig. 2 is the structural schematic diagram of one embodiment of the utility model secondary cell；
Fig. 3 is the bottom substance schematic diagram of lamina tecti in the utility model secondary cell cap assembly；
Fig. 4 is the exploded view of one embodiment of the utility model secondary cell；
Fig. 5 is the cross-sectional view of one embodiment of the utility model secondary cell；
Fig. 6 is enlarged drawing at the A in Fig. 5；
Fig. 7 A, Fig. 7 B and Fig. 7 C are respectively the perspective view of insulating part in Fig. 6, top view and B-B cross-sectional view；
Fig. 8 is that one embodiment of extended segment is arranged on insulating part top in the utility model secondary cell cap assembly
Structural schematic diagram；
Fig. 9 A and Fig. 9 B are respectively the top view of insulating part and C-C cross-sectional view in Fig. 8；
Figure 10 is the extension of lower insulation plate and second mistake of sealing element in the utility model secondary cell cap assembly
Open up the structural schematic diagram of the one embodiment set；
Figure 11 is the extension of lower insulation plate and second mistake of sealing element in the utility model secondary cell cap assembly
Open up the structural schematic diagram for another embodiment set；
Figure 12 is one embodiment that holding tank is arranged in the utility model secondary cell cap assembly on lower insulation plate
Structural schematic diagram.
Description of symbols
1a, electrode terminal；2a, sealing ring；3a, lamina tecti；4a, lower insulation plate；5a, connector；
1, electrode terminal；11, fixing seat；12, terminal board；2, sealing element；21, first；22, second；23, groove；
3, lamina tecti；31, through-hole；32, recessed portion；33, matching hole；34, exhaust component；35, liquid injection hole；4, insulating part；41, third
Portion；411, protrusion；42, the 4th；43, bending segment；5, lower insulation plate；51, the first main part；52, extension；53, lug boss；
54, holding tank；55, concave portion；56, boss；6, connector；61, the second main part；62, protrusion；7, electrode assembly；71, pole
Ear；8, shell.
Specific embodiment
The utility model described further below.In the following paragraphs, the different aspect of embodiment is defined in more detail.
The various aspects so limited can be combined with any other one aspect or many aspects, can not be combined unless explicitly stated otherwise.Especially
It is, it is considered to be preferred or advantageous any feature can be considered as preferred or advantageous spy with other one or more
Sign combination.
The terms descriptions merely for convenience such as " first " that occurs in the utility model, " second ", with distinguish have it is identical
The different building blocks of title are not offered as successive or primary-slave relation.
In addition, when element is referred to as " " another element "upper", the element can directly on another element, or
Person can be indirectly on another element and between them inserted with one or more intermediary elements.In addition, working as
When element is referred to as " being connected to " another element, which can be directly connected to another element, or can be indirectly
It is connected to another element and between them inserted with one or more intermediary elements.Hereinafter, same attached
Icon note indicates same element.
In order to which each orientation is explicitly described in the examples below, each side of coordinate system in Fig. 2 to secondary cell
To being defined, the direction x indicates the length direction of secondary cell；The direction y is vertical with the direction x in the horizontal plane, indicates secondary
The width direction of battery；The plane that the direction z is formed perpendicular to the direction x and y indicates the short transverse of secondary cell.
Based on such bearing definition, using the orientation or position of the instructions such as "upper", "lower", "top", "bottom", "inner" and "outside"
The description of relationship is set, this is merely for convenience of description the utility model, rather than the device of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore should not be understood as the limitation to scope of protection of the utility model.
By analysis, the reason that the safety of secondary battery of the prior art is lower is inventor:
First, as shown in Figure 1, the creepage distance between lamina tecti 3a and electrode terminal 1a is only sealing ring 2a and lower insulation
The length section of plate 4a extension tip contact, the position that overstriking line is illustrated as shown in figure 1, creepage distance is very short, by reversed
Security risk is high when high pressure, in fact it could happen that phenomena such as on fire or explosion.
Second, the extension of lower insulation plate 4a can drop, and the reason for this is that: there is fuse plastic cement on positive connector, makes just to connect
There is gap between the horizontal component and lower insulation plate 4a of part；It, also can be there are between lower insulation plate 4a in negative connector side
Gap, if h2=h1 in Fig. 1, due to manufacturing tolerance, the convex closure of connector 5a may be pushed up less than electrode terminal 1a, cause to weld
It is bad, so need h2 > h1 in practice, to guarantee that connector 5a is securely welded with electrode terminal 1a, thus lower insulation plate 4a with
Gap △ h=h2-h1 can be generated between the horizontal component of connector 5a.
Meanwhile lower insulation plate 4a is located at the part in through-hole and is equivalent to cantilever beam, therefore extension is easy tenesmus, to lead
Lower insulation plate 4a is caused to move down, make to generate gap between the top of extension and sealing ring 2a, will lead to: electrolyte can enter close
In the seal interface of seal 2a and lower insulation plate 4a, the electrolyte climbed on power path increases, and resistance reduces, electrode terminal 1a and top
There is security risk when applying the voltage of 500V or more between cover board 3a.
Based on the above issues, in order to improve the safety of secondary cell, main improved though is to increase the utility model
Creepage distance.
Fig. 2 is the structural schematic diagram of one embodiment of the utility model secondary cell, and exploded view is as shown in figure 4, two
Primary cell may include shell 8, electrode assembly 7, cap assembly and connector 6.
Electrode assembly 7 is located in shell 8, including opposite polarity first electrode and second electrode, for example, first electrode is
Positive electrode, second electrode are negative electrode.First electrode and second electrode include coated portion and uncoated part, uncoated portion
Quartile along the end of 7 length direction of electrode assembly, and forms tab in coating zone.
Cap assembly is located at 7 top of electrode assembly, and closes the opening of shell 8.Cap assembly include: lamina tecti 3, under
Insulation board 5 and two electrode terminals 1.Each component in cap assembly is described in detail below.
Fig. 3 is the structural schematic diagram of one embodiment of lamina tecti, and lamina tecti 3 is in thin-slab structure, is located at the opening of shell 8
Locate, the both ends on lamina tecti 3 along its length are respectively provided with the through-hole 31 for drawing first electrode and second electrode electric energy, lead to
The shape in hole 31 is adapted with electrode terminal 1, such as round, rectangle or ellipse etc..31 top of through-hole is equipped with recessed portion 32,
Electrode terminal 1 is fixed in recessed portion 32, is located at 3 outside of lamina tecti and covering through-hole 31.The centre of lamina tecti 3 along its length
Region is equipped with exhaust component 34 and liquid injection hole 35, and the existing structures such as explosion rupture disk can be used in exhaust component 34, for discharging secondary electricity
Gas in pond, plays safety effect；Liquid injection hole 35 is sealed for injecting electrolyte into secondary cell, and by sealing element.
As shown in figure 4, lower insulation plate 5 is at least partially disposed at side of the lamina tecti 3 far from electrode terminal 1, lower insulation plate 5
Shape be adapted to lamina tecti 3, for be isolated electrode assembly 7 and lamina tecti 3 plays insulating effect, such as plastics can be used etc. absolutely
Edge material is made.
Still referring to FIG. 4, in order to simplify the structure of electrode terminal 1, electrode terminal 1 includes fixing seat 11 and terminal board 12.Its
In, fixing seat 11 has the accommodation space adaptable with the shape of terminal board 12, terminal board 12 is located in the accommodation space,
And fixing seat 11 can limit the movement of 12 through-thickness of terminal board.Stepped cylindrical structure, stepped cylindrical can be used in fixing seat 11
The biggish one end of feature cross-section contour dimension is located in recessed portion 32, and electrode terminal 1 is fixed on lamina tecti 3.
Terminal board 12 is equipped with connection by being connected to inside through-hole 31 and shell 8 on the downside of cap assembly between electrode assembly 7
Part 6, to be electrically connected the tab 71 at 7 top of electrode assembly with terminal board 12 by connector 6.Secondary electricity as shown in Figure 4
The exploded view in pond and cross-sectional view shown in fig. 5, connector 6 are equipped with protrusion 62, and protrusion 62 protrudes into through-hole 31 and electrode tip
The terminal board 12 of son 1 is electrically connected.Such structure makes electrode terminal 1 be not necessarily to occupy the space in shell 8, and secondary cell can be improved
Energy density, and terminal board 12 is easy to process, and each embodiment given below is provided by taking such structure type as an example.
Optionally, electrode terminal 1 can also protrude into through-hole 31.
After providing the overall structure of secondary cell, the improvement of the utility model is described emphatically below.
Fig. 6 is enlarged drawing at the A of Fig. 5, is the structural schematic diagram of cap assembly one embodiment.With reference to Fig. 6, first give below
Cover the embodiment that the utility model improves thought, the subsequent embodiment that Fig. 6 is described in detail on this basis for one out.This is practical
Novel two sub-cell cap assemblies (subsequent abbreviation " cap assembly ") include: lamina tecti 3, electrode terminal 1, lower insulation plate 5,
Sealing element 2 and insulating part 4.Wherein, lamina tecti 3 is equipped with through-hole 31, and electrode terminal 1 covers through-hole 31, at least partly lower insulation
Plate 5 is located at side of the lamina tecti 3 far from electrode terminal 1.Sealing element 2 is at least partially disposed between lamina tecti 3 and terminal board 12,
Insulating part 4 is at least partially disposed between lamina tecti 3 and lower insulation plate 5.Insulating part 4 and sealing element 2 surround through-hole 31 jointly
Side wall and 3 upper and lower surface of lamina tecti are close to the region of 31 side wall of through-hole.The materials systems such as silicon rubber, fluorubber can be used in sealing element 2
At the material of the electrolyte resistances such as PVC, PP, PE or PET or resistance to strong acid can be used in insulating part 4.
The cap assembly of the embodiment between lamina tecti 3 and lower insulation plate 5 by increasing insulating part 4, from being parallel to xy
The cutting plane of plane can be seen that in the state that sealing element 2 is in good seal, climbing between lamina tecti 3 and terminal board 12
Electrical distance, along the shortest distance on fixed insulating materials surface, includes at least: 4 He of insulating part between lamina tecti 3 and terminal board 12
Length of fit section between sealing element 2 and lower insulation plate 5, or further further include in sealing element 2 and insulating part 4 near
Nearly 31 center of through-hole and the side length section not contacted with lower insulation plate 5.There is seal clearance in sealing element 2 and insulating part 4
Situation, the length section and sealing element 2 that length section that sealing element 2 cooperates with insulating part 4, sealing element 2 cooperate with lower insulation plate 5 lean on
Nearly 31 center of through-hole and creepage distance is not constituted yet by the side wall sections that lower insulation plate 5 coats.And in the scheme of the prior art, climb electricity
The length section of distance only sealing ring 2a medial surface and lower insulation plate 4a cooperation.Therefore, no matter is the cap assembly of the utility model
How is the sealing condition of sealing element 2, extends creepage distance than the scheme of the prior art.
Therefore, the cap assembly of the utility model can increase the creepage distance between lamina tecti 3 and terminal board 12, accordingly
Ground, the creepage distance between lamina tecti 3 and connector 6 also increase, electrode assembly be abnormal situation occur high pressure (such as
The voltage of 500V or more) electric discharge when, equivalent to increase the safe distance inside secondary cell, can reduce battery core occurred it is hot
A possibility that risks such as fried, improves the safety of secondary cell work.
The assembling process of such cap assembly are as follows: first insulating part 4 is fixed on lamina tecti 3, then installs sealing element 2, is connect
Assembling electrode terminal 1, and electrode terminal 1 is welded on lamina tecti 3, finally assembles lower insulation plate 5 and be welded and fixed to top
On cover board 3.
Still referring to FIG. 6, sealing element 2 is annular stepped structure, including first 21 and second 22, second 22 transversal
Contour dimension, that is, the circumferential size in face is less than first 21.Wherein, it is located between lamina tecti 3 and terminal board 12 for first 21, the
It is located at insulating part 4 for two 22 to contact close to the side at 31 center of through-hole, and with insulating part 4.In practical structures, sealing element 2
The part contacted with other structures is all made of interference fit.
Alternatively, second 22 medial surface is concordant with the medial surface of insulating part 4, and such structure can also increase lamina tecti
Creepage distance between 3 and terminal board 12.
Cap assembly shown in Fig. 6 at least has one of following advantage:
1, the medial surface of sealing element 2 is more than the medial surface of insulating part 4, makes mutually staggering for sealing element 2 and insulating part 4, and
By 4 portion envelops of insulating part, creepage distance can be further increased, increased portion is divided into second 22 bottom thickness, improves two
The safety of primary cell work.
2, there is overlapping part between sealing element 2 and the connection end of insulating part 4, the leakproofness to electrolyte can be increased,
Reduce the electrolyte on creepage distance, resistance can be increased in the case where no electrolyte, to periodically reduce in voltage one
Electric current can weaken electrion degree.
3, such structure can increase the stability connected between sealing element 2 and insulating part 4, remain to after long-term use
To preferably sealing and insulating effect.
Still referring to FIG. 6, insulating part 4 is stepped annular structure, comprising: third portion 41 and the 4th 42, the 4th 42 cross
Section contour dimension is less than third portion 41.Wherein, third portion 41 is located between lamina tecti 3 and lower insulation plate 5, the 4th 42
Outer surface is bonded with the side wall of through-hole 31, and the 4th 42 top surface is not less than the upper surface that lamina tecti 3 is contacted with sealing element 2.
Such structure can be conducive to be positioned between sealing element 2 and insulating part 4, improve the reliability and stability of the two connection,
Remain to play preferably sealing and insulating effect after long-term use.
Still referring to FIG. 6, the 4th 42 top surface is higher than the most bottom surface of sealing element 2, such structure can extend creepage distance, mention
The reliability and safety of high secondary cell work.Specifically, the 4th 42 top surface is higher than second 22 bottom of sealing element 2
Face, making creepage distance includes the width of second 22 seal interface contacted with extension 52, to extend creepage distance.
On this basis, it is equipped with concave-convex fit structure between sealing element 2 and insulating part 4, the connection of the two can be made more firm
Gu improving connective stability, also it is not susceptible to misplace when sealing element 2 is squeezed in assembling process, it is ensured that sealing effect.
Specifically, first 21 bottom surface is equipped with groove 23, and the 4th 42 top insertion groove 23 forms bumps and match
Close structure.Preferably, second 22 lateral surface can be used as the side wall of groove 23, after the 4th 42 top is embedded in groove 23
Second 22 can be made to fit closely with the 4th 42, to improve sealing effect.
With reference to Fig. 6, there is the case where seal clearance in sealing element 2 and insulating part 4, sealing element 2 is matched with 4 bumps of insulating part
Side wall sections also structure of the length section and sealing element 2 that the length section of conjunction, sealing element 2 and lower insulation plate 5 cooperate close to 31 center of through-hole
At creepage distance.
In one form of construction, as shown in fig. 6, the 4th 42 top is straight wall section, the width of groove 23 and the 4th
The thickness in portion 42 is adapted to, the L-shaped structure on longitudinal section of insulating part 4.Such structure is easily assembled.4th 42 top with it is recessed
Slot 23 is fitted close to be formed and be tightly connected, and improves the sealing effect to electrolyte.Perspective view, top view and the B-B of sealing element 2
Cross-sectional view is respectively as shown in Fig. 7 A, 7B and 7C.
In another structure type, as shown in figure 8, the 4th 42 top has bending segment 43,43 direction of bending segment
Extend far from second 22 side, and fit in the upper surface that lamina tecti 3 is contacted with sealing element 2, sealing element 2 is on longitudinal section
It is in C-shaped configuration.It is tight between bending segment 43 and groove 23 and between the 4th 42 inner sidewall and second 22 lateral wall
Close fit, which is formed, to be tightly connected, and improves the sealing effect to electrolyte.The top view and C-C cross-sectional view of sealing element 2 are respectively as schemed
Shown in 9A and 9B.
Such structure can increase insulating part 4 and sealing element 2 in the contact area of junction, be not susceptible to become in junction
Shape increases connectivity robustness and stability；Moreover, increasing bending segment 43 by the top at the 4th 42, insulation can be increased
The intensity on 4 top of part, is not susceptible to deform, and can reduce the electrolyte on creepage distance, periodically reduces electric current in voltage one, thus
Weaken electrion degree.
As shown in fig. 6, lower insulation plate 5 includes the first main part 51 and cricoid extension 52 being connected to each other, first is main
Body portion 51 is rectangular plate-like structure, and size is adapted with lamina tecti 3, and extension 52 extends to through-hole 31 and is at least partially disposed at logical
In hole 31, and extending towards electrode terminal 1, second 22 bottom end is mutually abutted with the top of extension 52, more preferably, the
It is interference fit between two 22 bottom ends and the top of extension 52, realizes and be tightly connected.
The width of 52 top of extension and second 22 bottom end bearing surface also constitutes one of creepage distance in such structure
Point, it can further extend creepage distance, improve the safety of secondary cell work.Moreover, 52 top of extension can be to close
Sealing 2 is played a supporting role, and makes to form sealed connection between extension 52 and second 22, thus sealing element 2 is simultaneously by electricity
The extruding of extreme son 1, lamina tecti 3, insulating part 4 and extension 52 is, it can be achieved that preferably sealing performance, even if extension 52 occurs
Tenesmus, the pre compressed magnitude of sealing element 2 can also offset the part tenesmus amount of extension 52, keep between sealing element 2 and extension 52
Sealing effect, the electrolyte on creepage distance can be reduced.
For the structure that second 22 bottom end is mutually abutted with the top of extension 52, three kinds of realization shapes are given below
Formula.
In one form of construction, as shown in fig. 6, the face that 52 top of extension is contacted with second 22 bottom end is level
Face.Such structure is easy to process, and extension 52 can provide second 22 stable support force.
In another structure type, face that 52 top of extension is contacted with second 22 bottom end from the inside of through-hole 31 to
Outside tilts gradually downward, is not shown in the figure.Extension 52 in such structure while to second 22 offer support force,
Lateral pressure can also be provided to second 22 bottom end, optimize the sealing effect of sealing element 2.
In yet another construction form, the outer on the top of extension 52 is equipped with annular groove, and second 22 bottom end abuts
In annular groove, it is not shown in the figure.Part of 52 top of extension other than annular groove forms boss in such structure, also can
Lateral pressure is provided to second 22 bottom end, optimizes the sealing effect of sealing element 2.
Still referring to FIG. 6, third portion 41 is located between lamina tecti 3 and lower insulation plate 5, and third portion 41, lamina tecti 3 and it is lower absolutely
Cavity is formed between listrium 5, such as forms wedge shape cavity.For such structure, between lamina tecti 3 and terminal board 12 climb electricity away from
From further including the third portion 41 of insulating part 4 far from the Sidewall Height of the 4th 42 one end.
Wherein, third portion 41 can be fixed by way of bonding with 3 bottom of lamina tecti, or as shown in Figure 10, third portion
41 top surfaces are equipped with protrusion 411, and lamina tecti 3 is equipped with matching hole 33, protrusion 411 and matching hole 33 cooperate by third portion 41 with
Lamina tecti 3 is fixed, and protrusion 411 and matching hole 33 can be circumferentially arranged with multiple groups.
Such structure is not necessarily to change the structure of lamina tecti 3 and lower insulation plate 5, only need to be by the deformation of lower insulation plate 5 by the
It is clipped between lamina tecti 3 and lower insulation plate 5 for three 41, can avoid the intensity for weakening lamina tecti 3 and lower insulation plate 5, and lower exhausted
The screen resilience that the deformation of listrium 5 generates can make second 22 of the abutting sealing element 2 of extension 52, improve sealing effect.
In other structures form, at least one of lamina tecti 3 and lower insulation plate 5 are equipped with holding tank 54, holding tank 54
It for annular groove and is located at close to the region of 31 side wall of through-hole, third portion 41 is located in holding tank 54, lamina tecti 3 and lower insulation plate 5
Region contact other than holding tank 54.Such structure can position insulating part 4 in assembly, be conducive to assembly, and absolutely
The third portion 41 of edge part 4, which is located in holding tank 54, can be improved mounting stability；It is occupied in shell 8 moreover, insulating part 4 can be reduced
Space, improve battery energy density.
As shown in figure 8, holding tank 54 is located at 3 bottom of lamina tecti.As shown in figure 12, holding tank 54 is located at lower insulation plate 5
Top can increase creepage distance compared with holding tank 54 is located at 3 bottom of lamina tecti.
In further embodiments, as shown in Figure 10~Figure 12, lower insulation plate 5 includes the first main part 51 being connected to each other
With cricoid extension 52, extension 52 extends to through-hole 31 and is at least partially disposed in through-hole 31, and prolongs towards electrode terminal 1
Stretch, the difference from Fig. 6 is that, second 22 between insulating part 4 and extension 52, and extension 52 and second 22
Contact, second 22 bottom end and lower insulation plate 5 are tightly connected.Creepage distance between lamina tecti 3 and terminal board 12 at least wraps
Include: the length section and 2 medial surface of sealing element that sealing element 2 and insulating part 4 are contacted with lower insulation plate 5 are not extended portion 52 and coat
Length section.Correspondingly, such structure also can increase the creepage distance between lamina tecti 3 and connector 6.
Extension 52 in such structure is coated on second 22 side, can provide pressure to second 22 side
Clamp force, so that the different zones of sealing element 2 are in close contact with terminal board 12, lamina tecti 3, lower insulation plate 5 and insulating part 4 respectively,
Make sealing element 2 by balanced extruding force, improves sealing effect.Moreover, second 22 side is coated on by extension 52,
Sealing element 2 can be reduced and contact electrolyte, prevent sealing element 2 from Swelling occurs, to improve service life.
Still referring to FIG. 10, the top of extension 52 and 1 bottom of electrode terminal have pre-determined distance, such structure can be to close
The portion of medial side of sealing 2 provides pressing force, makes sealing element 2 by balanced extruding force, improves sealing effect.
As shown in figure 12, the top of extension 52 extend to reach 1 bottom surface of electrode terminal, and at 1 bottom surface of electrode terminal
In contactless state.Extension 52 in such structure can provide pressing force to the entire medial surface of sealing element 2, make sealing element
2, by balanced extruding force, improve sealing effect；Moreover, extension 52 can prevent electrolyte from contacting with sealing element 2, prevent close
Swelling occurs for sealing 2.In addition, the top of extension 52 and 1 bottom surface of electrode terminal are in contactless state, it is ensured that electrode
It is in close contact at the top of 1 bottom of terminal and sealing element 2, improves sealing performance.
Still referring to FIG. 10,41 top surface of third portion is equipped with protrusion 411 in order to make insulating part 4 be connected firmly with lamina tecti 3,
Lamina tecti 3 is equipped with matching hole 33, and protrusion 411 and matching hole 33 cooperate third portion 41 and lamina tecti 3 is fixed, 411 He of protrusion
Matching hole 33 can be circumferentially arranged with multiple groups, and insulating part 4 is connected firmly with lamina tecti 3, not easily to fall off.Third portion 41 is clipped in lamina tecti
Between 3 and lower insulation plate 5, and cavity is enclosed between insulating part 4, lamina tecti 3 and lower insulation plate 5.
As shown in figure 11, the difference from Fig. 10 is that, in order to make insulating part 4 be connected firmly with lamina tecti 3, insulating part
4 third portion 41 can be connected to 3 bottom of lamina tecti by way of bonding, and such structure can reduce lamina tecti 3 and insulating part 4
Difficulty of processing, and it is easy to assembly.
As shown in figure 12, the difference from Fig. 10 is that, holding tank 54 is equipped on lower insulation plate 5, third portion 41 is set
In holding tank 54, lamina tecti 3 is contacted with region of the lower insulation plate 5 other than holding tank 54.
Referring still to Figure 12, the outside of 51 junction of extension 52 and the first main part is equipped with lug boss 53, second 22 to
Under extend to and lug boss 53 be tightly connected.Second 22 bottom end and lug boss 53 are interference fitted, and can increase by second 22 bottom
The performance that end is tightly connected with lower insulation plate 5, reduces the electrolyte on creepage distance, can increase in the case where no electrolyte
Power-up resistance, to periodically reduce electric current in voltage one, can weaken electrion degree.
For example, lug boss 53 includes being located at 51 junction of extension 52 and the first main part in the structure shown in Figure 12
Oblique angle, second 22 bottom end is interference fitted by compressive deformation and oblique angle, deforms to rise when with chamfered fit
To preferably sealing effect.Or lug boss 53 includes the step for being located at 51 junction of extension 52 and the first main part.Second
The bottom end in portion 22 and step interference fit improve leakproofness.
In the cap assembly of the utility model above-described embodiment, increase insulating part between lamina tecti and lower insulation plate, it can
Increase the creepage distance between lamina tecti and electrode terminal, when electrode assembly is abnormal situation and electrion occurs, quite
In increasing the safe distance inside secondary cell, a possibility that risks such as explosion on fire occur for battery core can be reduced, is improved secondary
The safety of battery work.
A kind of secondary cell cap assembly provided by the utility model and secondary cell are described in detail above.
Specific embodiment used herein is expounded the principles of the present invention and embodiment, and above embodiments are said
The bright method and its core concept for being merely used to help understand the utility model.It should be pointed out that for the common of the art
For technical staff, without departing from the principle of this utility model, can also to the utility model carry out it is several improvement and
Modification, modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (17)
1. a kind of secondary cell cap assembly characterized by comprising
Lamina tecti (3) is equipped with through-hole (31)；
Electrode terminal (1) covers the through-hole (31)；
Lower insulation plate (5) is at least partially disposed at the side of the lamina tecti (3) far from the electrode terminal (1)；
Sealing element (2) is at least partially disposed between the lamina tecti (3) and the electrode terminal (1)；With
Insulating part (4) is at least partially disposed between the lamina tecti (3) and the lower insulation plate (5)；
Wherein, the insulating part (4) and the sealing element (2) surround the side wall and the lamina tecti of the through-hole (31) jointly
(3) region of the upper and lower surface close to the through-hole (31).
2. secondary cell cap assembly according to claim 1, which is characterized in that the sealing element (2) is cyclic structure,
Include:
It first (21), is located between the lamina tecti (3) and the electrode terminal (1)；With
Second (22), the contour dimension of cross section is less than first (21), and described second (22) are located at described exhausted
Edge part (4) is contacted close to the side at the through-hole (31) center with the insulating part (4).
3. secondary cell cap assembly according to claim 1, which is characterized in that the insulating part (4) is cyclic structure,
Include:
Third portion (41) is located between the lamina tecti (3) and the lower insulation plate (5)；With
4th (42), the contour dimension of cross section is less than the third portion (41), the outer surface of the 4th (42) with
The side wall of the through-hole (31) is bonded, and the top surface of the 4th (42) is not less than the lamina tecti (3) and the sealing element
(2) upper surface contacted.
4. secondary cell cap assembly according to claim 1, which is characterized in that the insulating part (4) is cyclic structure,
Include:
Third portion (41) is located between the lamina tecti (3) and the lower insulation plate (5)；With
4th (42), the contour dimension of cross section is less than the third portion (41), the outer surface of the 4th (42) with
The side wall of the through-hole (31) is bonded, and the top surface of the 4th (42) is higher than the most bottom surface of the sealing element (2).
5. secondary cell cap assembly according to claim 1, which is characterized in that the sealing element (2) and the insulation
Concave-convex fit structure is equipped between part (4).
6. secondary cell cap assembly according to claim 5, which is characterized in that
The sealing element (2) is cyclic structure, comprising: first (21) and second (22), first (21) are located at institute
It states between lamina tecti (3) and the electrode terminal (1)；The contour dimension of the cross section of second (22) is less than described first
Portion (21), described second (22) be located at the insulating part (4) close to the through-hole (31) center side, and with the insulation
Part (4) contact；
The insulating part (4) is cyclic structure, comprising: third portion (41) and the 4th (42), the third portion (41) is located at institute
It states between lamina tecti (3) and the lower insulation plate (5)；The contour dimension of the cross section of the 4th (42) is less than the third
The outer surface in portion (41), the 4th (42) is bonded with the side wall of the through-hole (31)；
Wherein, the bottom surface of first (21) is equipped with groove (23), and the top of the 4th (42) is embedded in the groove
(23) concave-convex fit structure is formed.
7. secondary cell cap assembly according to claim 6, which is characterized in that
The top of the 4th (42) is straight wall section；Or
The top of the 4th (42) has bending segment (43), and the bending segment (43) is directed away from second (22)
Side extends, and fits in the upper surface that the lamina tecti (3) is contacted with sealing element (2).
8. secondary cell cap assembly according to claim 2, which is characterized in that the lower insulation plate (5) includes each other
The first main part (51) and cricoid extension (52) of connection, the extension (52) extend to the through-hole (31) and at least
Part is located in the through-hole (31), and the bottom end of second (22) is mutually abutted with the top of the extension (52).
9. secondary cell cap assembly according to claim 8, which is characterized in that
The face that the extension (52) contacts with second (22) is horizontal plane；Or
The face that the extension (52) contacts with second (22) from the inside of the through-hole (31) to outside gradually downward
Inclination；Or
The outer on the top of the extension (52) is equipped with annular groove, and the bottom end of second (22) is connected to the annular groove
In.
10. secondary cell cap assembly according to claim 2, which is characterized in that the lower insulation plate (5) includes each other
The first main part (51) and cricoid extension (52) of connection, the extension (52) extend to the through-hole (31) and at least
Part be located at the through-hole (31) in, described second (22) between the insulating part (4) and the extension (52), and
The extension (52) contacts with second (22).
11. secondary cell cap assembly according to claim 10, which is characterized in that prolong on the top of the extension (52)
It extends to and reaches electrode terminal (1) bottom surface, and be in contactless state with the electrode terminal (1) bottom surface.
12. secondary cell cap assembly according to claim 10, which is characterized in that the extension (52) is main with first
The outside of body portion (51) junction is equipped with lug boss (53), and second (22) extend downward into close with the lug boss (53)
Envelope connection.
13. secondary cell cap assembly according to claim 12, which is characterized in that
The lug boss (53) includes the oblique angle for being located at the extension (52) Yu the first main part (51) junction；Or
The lug boss (53) includes the step for being located at the extension (52) Yu the first main part (51) junction.
14. secondary cell cap assembly according to claim 3, which is characterized in that the third portion (41) is located at described
Between lamina tecti (3) and the lower insulation plate (5), and the third portion (41), the lamina tecti (3) and the lower insulation plate
(5) cavity is formed between.
15. secondary cell cap assembly according to claim 3, which is characterized in that the third portion (41) is equipped with prominent
It rises (411), the lamina tecti (3) is equipped with matching hole (33), and the protrusion (411) and matching hole (33) cooperate the third
Portion (41) and the lamina tecti (3) are fixed.
16. secondary cell cap assembly according to claim 3, which is characterized in that the lamina tecti (3) and it is described it is lower absolutely
At least one of listrium (5) is equipped with holding tank (54), and the third portion (41) is located in the holding tank (54), the top cover
Plate (3) is contacted with region of the lower insulation plate (5) other than holding tank (54).
17. a kind of secondary cell characterized by comprising
Shell (8)；
Electrode assembly (7) is located in the shell (8)；With
Any secondary cell cap assembly of claim 1~16, is located above the electrode assembly (7), and close
The shell (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470072.0U CN209658243U (en) | 2019-04-09 | 2019-04-09 | Secondary cell cap assembly and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470072.0U CN209658243U (en) | 2019-04-09 | 2019-04-09 | Secondary cell cap assembly and secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209658243U true CN209658243U (en) | 2019-11-19 |
Family
ID=68529048
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920470072.0U Active CN209658243U (en) | 2019-04-09 | 2019-04-09 | Secondary cell cap assembly and secondary cell |
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| CN (1) | CN209658243U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109428023A (en) * | 2017-08-31 | 2019-03-05 | 宁德时代新能源科技股份有限公司 | Fixing frame, battery unit and battery module |
| CN110176558A (en) * | 2019-04-09 | 2019-08-27 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap subassembly and secondary cell |
| WO2020228486A1 (en) * | 2019-05-14 | 2020-11-19 | 宁德时代新能源科技股份有限公司 | Top cover assembly, secondary battery, battery pack, and electrical device |
| CN112736338A (en) * | 2021-01-08 | 2021-04-30 | 中天储能科技有限公司 | Cover plate assembly and battery applying same |
| CN114284542A (en) * | 2021-12-28 | 2022-04-05 | 山西中科华孚汽车动力研究总院有限公司 | Battery manufacturing method and battery |
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2019
- 2019-04-09 CN CN201920470072.0U patent/CN209658243U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109428023A (en) * | 2017-08-31 | 2019-03-05 | 宁德时代新能源科技股份有限公司 | Fixing frame, battery unit and battery module |
| CN109428023B (en) * | 2017-08-31 | 2024-04-16 | 宁德时代新能源科技股份有限公司 | Fixing frame, battery unit and battery module |
| CN110176558A (en) * | 2019-04-09 | 2019-08-27 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap subassembly and secondary cell |
| WO2020207238A1 (en) * | 2019-04-09 | 2020-10-15 | 宁德时代新能源科技股份有限公司 | Secondary battery top cover assembly and secondary battery |
| CN110176558B (en) * | 2019-04-09 | 2024-04-19 | 宁德时代新能源科技股份有限公司 | Secondary battery top cap subassembly and secondary battery |
| WO2020228486A1 (en) * | 2019-05-14 | 2020-11-19 | 宁德时代新能源科技股份有限公司 | Top cover assembly, secondary battery, battery pack, and electrical device |
| CN112736338A (en) * | 2021-01-08 | 2021-04-30 | 中天储能科技有限公司 | Cover plate assembly and battery applying same |
| CN112736338B (en) * | 2021-01-08 | 2023-04-11 | 中天储能科技有限公司 | Cover plate assembly and battery applying same |
| CN114284542A (en) * | 2021-12-28 | 2022-04-05 | 山西中科华孚汽车动力研究总院有限公司 | Battery manufacturing method and battery |
| CN114284542B (en) * | 2021-12-28 | 2024-02-06 | 山西中科华孚电池研究总院有限公司 | Manufacturing method of battery and battery |
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