Electrokinetic cell cap assembly and electrokinetic cell
Technical field
The utility model belongs to power battery technology field, more particularly to a kind of electrokinetic cell cap assembly and the use top
The electrokinetic cell of cap assemblies.
Background technology
Electric automobile and energy-accumulating power station etc., which generally require, uses the electrokinetic cell with Large Copacity as power supply.These power
Battery is except with high power capacity, should also have good security and longer cycle life etc., can be only achieved the mark used
It is accurate and meet the needs of people.
Wherein, when electrokinetic cell overcharges, the decomposition of the electrolyte in electrokinetic cell can make to produce inside electrokinetic cell
The heat of amount causes battery catches fire;Or the increase of electrokinetic cell internal pressure can be made to cause battery explosion.Therefore lost in electrokinetic cell
, it is necessary to cut off the fuse in the major loop of electrokinetic cell (Fuse) structure by means of an external short circuit structure before control, resistance
Stopping power battery continues to charge.For example, when electrokinetic cell overcharges, certain air pressure is produced inside electrokinetic cell, it is outer short
Line structure works, and electrokinetic cell is formed a loop in itself so that Fuse fuses, so as to cut off major loop.Such as Fig. 1 institutes
Showing, realize the function of the external short circuit structure using rotating sheet 1 ' in the prior art, the rotating sheet 1 ' uses one piece of disk, and
Disk center sets a cylindrical boss.When normal use, rotating sheet 1 ' is with the pole 2 ' on electrokinetic cell top cover
Disconnect insulation.When electrokinetic cell overcharges and produces certain air pressure, air pressure can promote rotating sheet 1 ' to act so that rotating sheet 1
In cylindrical boss be connected with conducting block 3 ', and conducting block 3 ' electrically connects with pole 2 ', so as to be formed back in electrokinetic cell
Road so that Fuse fuses, and cuts off major loop, protects electrokinetic cell.
However, there is following defect in existing upset chip architecture:On the one hand, existing conducting block is generally aluminium block, so
A high current can be produced in the moment that rotating sheet contacts with aluminium block, easily causes contact position local melting, in addition, though can
To play a part of cut-off loop by Fuse, but still there can be potential safety hazard, if Fuse structures are before occurring thermal runaway
It can not in time fuse, be easy to trigger safety problem, cause the security performance of electrokinetic cell can not be effectively ensured;It is another
Aspect, the setting of Fuse structures can take the inner space of electrokinetic cell, substantially reduce the energy density of electrokinetic cell.
Utility model content
The purpose of this utility model is:In view of the shortcomings of the prior art, electrokinetic cell peace can be improved by providing one kind
The electrokinetic cell cap assembly of full performance and energy density, and the electrokinetic cell using this cap assembly is provided.
To achieve these goals, the utility model uses following technical scheme:
A kind of electrokinetic cell cap assembly, including coping plate, negative terminal and rotating sheet, the negative terminal and the coping plate
Insulation assembling, the coping plate are provided with connecting hole, and the rotating sheet seals the connecting hole, and the negative terminal includes matrix part
And the trunk portion extended downwardly by matrix part, the rotating sheet are provided with resistance bolck, the resistance bolck is relative with described matrix portion
Set, when electrokinetic cell internal pressure exceedes the eversion pressure of rotating sheet, the rotating sheet is flipped up so that the resistance
Block electrically connects with described matrix portion.
As the utility model electrokinetic cell cap assembly one kind improve, the rotating sheet include weld part, boss with
And the connecting portion between the weld part and the boss is arranged at, the boss sets fluted or flange, the resistance bolck
The projection with the fit depressions is provided with, or the resistance bolck is provided with the groove being engaged with the flange.
One kind as the utility model electrokinetic cell cap assembly is improved, and the boss is arranged in the connecting portion
Position is entreated, the weld part is arranged on the outward flange of the connecting portion, and the weld part electrically connects with the coping plate.
One kind as the utility model electrokinetic cell cap assembly is improved, the weld part, the boss
And
The integrated attachment structure of connecting portion.
One kind as the utility model electrokinetic cell cap assembly is improved, and the thickness of the connecting portion is from boss to weldering
It is gradually reduced on the direction of socket part.Connecting portion is designed to the structure of variable cross-section, rotating sheet can not only be ensured in specified pressure
Under be flipped up, also effectively increase the area of passage of connecting portion inner ring, reduce the probability that rotating sheet is blown, so as to
The danger that electrokinetic cell is on fire or explodes is effectively reduced, further enhancing the security performance of electrokinetic cell.
One kind as the utility model electrokinetic cell cap assembly is improved, and the boss is solid construction, the connection
Portion is sheet annuli arrangement, and the thickness of the boss is more than the thickness of the connecting portion.Because rotating sheet contacts with matrix part
Position be excessively stream neck region, it is therefore very big in rotating sheet and matrix part Contact electric current, easily cause contact position
Local melting.The structure of stop block is thus powered up by solid boss, it is ensured that rotating sheet is not blown under high current, so as to have
Effect ground reduces electrokinetic cell and on fire or blast danger occurs, and drastically increases the security performance of electrokinetic cell.
One kind as the utility model electrokinetic cell cap assembly is improved, connecting portion and the horizontal plane shape of the rotating sheet
Into angle be 6~60 °, preferably 10~30 °.Wherein α specific value can be configured according to being actually needed, and different
Setting angle can influence the action that rotating sheet is flipped up.When α values are too small, cause the hypotelorism of boss and resistance bolck,
So rotating sheet easily occurs misconnection with resistance bolck and makes battery failure under normal circumstances;When α values are excessive so that rotating sheet
Center of gravity reduces, and adds somewhat to the resistance that rotating sheet acts upwards, so rotating sheet may be caused to act generation upwards
Hysteresis, so as to influence the security performance of battery.
One kind as the utility model electrokinetic cell cap assembly is improved, and the material of the resistance bolck is carborundum, stone
At least one of ink and polyphenylene sulfide;The resistance bolck that the material makes is fully able to meet chemical property demand.
One kind as the utility model electrokinetic cell cap assembly is improved, the resistance size of the resistance bolck for 0.1~
1000mΩ.If the resistance of resistance bolck is too low, the conveyance capacity of resistance bolck can be substantially reduced, can not so meet electric conductivity need
Ask, do not have the effect of being effectively protected;If the resistance of resistance bolck is too high, the conveyance capacity of resistance bolck, such nothing can be greatly increased
Method makes battery before thermal runaway occurs by electric current abrupt release, while can not also cancel Fuse structures, and then can not improve power
The energy density of battery.
One kind as the utility model electrokinetic cell cap assembly is improved, the eversion pressure of the rotating sheet for 0.01~
1.2Mpa, preferably 0.1~0.8Mpa.If eversion pressure is excessive, safety protection function is not had;If eversion pressure is too small, shadow
Ring the normal use of electrokinetic cell.
One kind as the utility model electrokinetic cell cap assembly is improved, and the coping plate is additionally provided with pole installation
Hole, the negative terminal are electrically connected with conductive matrix through the pole mounting hole, set between the trunk portion and the coping plate
Insulated enclosure circle is equipped with, insulated plastic part is provided between described matrix portion and the coping plate, the resistance bolck passes through institute
State insulated plastic part and be fixed on the groove, set between the coping plate, the insulated enclosure circle and the conductive matrix
There is lower insulated plastic part.
One kind as the utility model electrokinetic cell cap assembly is improved, and the coping plate, which is provided with, protrudes from upper surface
Convex closure, the convex closure forms convex closure resettlement section, the pole mounting hole and the connecting hole in the lower surface of the coping plate
It may be contained within the convex closure.It will be moved into during installation on pole in the convex closure resettlement section of coping plate, ensureing that electrokinetic cell is basic
While performance, height of the pole in enclosure interior is reduced, bigger installing space has been vacateed to battery core, so that power electric
The energy density in pond gets a promotion.
In addition, the utility model additionally provides a kind of electrokinetic cell, including battery core, housing and cap assembly, the battery core
It is placed in the housing, the cap assembly is sealingly mounted on the housing, and the cap assembly is any of the above-described paragraph institute
The cap assembly stated.
Compared to prior art, the beneficial effects of the utility model are:The utility model makes rotating sheet add resistance bolck,
The resistance that resistance bolck is set by adjusting controls protective current, when electrokinetic cell internal pressure increases to the eversion pressure of rotating sheet,
Rotating sheet is flipped up, and resistance bolck is electrically connected with the matrix part of pole, forms low discharging current, reduces the capacitance of battery,
The energy of aggregation is released, so as to avoid battery that thermal runaway occurs, ensures the security performance of battery;In addition, this practicality is new
The cap assembly of type can also save the setting of fuse (Fuse) structure, reduce its space-consuming in inside battery, effectively carry
The high energy density of electrokinetic cell.
Brief description of the drawings
Fig. 1 is the part-structure schematic diagram of electrokinetic cell top cover in the prior art.
Fig. 2 is the structural representation of electrokinetic cell cap assembly of the present utility model.
Fig. 3 is the partial enlarged drawing of A in Fig. 2.
Fig. 4 is the structure decomposition figure of electrokinetic cell cap assembly of the present utility model.
Fig. 5 is the structural representation of the resistance bolck of electrokinetic cell cap assembly in the utility model.
Fig. 6 is one of structural representation of rotating sheet of electrokinetic cell cap assembly in the utility model.
Fig. 7 is two of the structural representation of the rotating sheet of electrokinetic cell cap assembly in the utility model.
In figure:1- coping plates;11- pole mounting holes;2- negative terminals;21- matrix parts;22- trunk portions;3- rotating sheets;31-
Boss;32- connecting portions;33- weld parts;4- resistance bolcks;41- is raised;5- conduction matrixs;6- insulated enclosure circles;The upper insulated plastics of 7-
Glue part;Insulated plastic part under 8-;9- positive terminals.
Embodiment
To make the technical solution of the utility model and advantage clearer, below in conjunction with embodiment and specification
Accompanying drawing, the utility model and its advantage are described in further detail, but embodiment of the present utility model is not limited to
This.
As shown in Fig. 2~7, a kind of electrokinetic cell cap assembly, including coping plate 1, negative terminal 2, positive terminal 9 and rotating sheet
3, negative terminal 2 is assembled with the insulation of coping plate 1, and positive terminal 9 is conductively connected with coping plate 1, and coping plate 1 is provided with pole mounting hole 11
And connecting hole, rotating sheet 3 seal connecting hole, negative terminal 2 and positive terminal 9 include matrix part 21 and extended downwardly by matrix part 21
Trunk portion 22, negative terminal 2 and positive terminal 9 be each passed through pole mounting hole 11 and electrically connected with conductive matrix 5, trunk portion 22 and top
Insulated enclosure circle 6 is provided between cover plate 1, wherein, it is provided with insulated plastic between the matrix part 21 and coping plate 1 of negative terminal 2
Glue part 7, resistor disc, coping plate 1, insulated enclosure circle 6 and conductive base are provided between the matrix part 21 and coping plate 1 of positive terminal 9
Lower insulated plastic part 8 is provided between block 5.
Wherein, negative terminal 2 is Copper-Aluminum compound post, and positive terminal 9 is aluminium post;Positive and negative terminals are distinguished to be more preferable, can be in negative terminal 2
Surface marking negative pole mark, positive terminal 9 surface marking positive pole mark;Rotating sheet 3 is provided with resistance bolck 4, resistance bolck 4 with
Matrix part 21 is oppositely arranged, and when electrokinetic cell internal pressure exceedes the eversion pressure of rotating sheet 3, rotating sheet 3 is flipped up, and is made
Obtain resistance bolck 4 to electrically connect with matrix part 21, form low discharging current, reduce the SOC of battery, be released the energy of aggregation,
So as to avoid battery that thermal runaway occurs, ensure the security performance of battery.
Wherein, the material of resistance bolck 4 is at least one of carborundum, graphite and polyphenylene sulfide;The electricity that the material makes
Stop block 4 can meet chemical property demand very well.
Wherein, rotating sheet 3 includes weld part 33, boss 3 and the connecting portion being arranged between weld part 33 and boss 3
32,32 integrated attachment structure of weld part 33, boss 3 and connecting portion;Boss 3 set it is fluted, resistance bolck 4 be provided with
The projection 41 of fit depressions;Or boss 3 is provided with flange, resistance bolck 4 is provided with the groove being engaged with flange.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, boss 3 is arranged on connecting portion 32
Middle position, weld part 33 are arranged on the outward flange of connecting portion 32, and weld part 33 electrically connects with coping plate 1.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, the thickness of connecting portion 32 is from boss
3 to being gradually reduced on the direction of weld part 33.Connecting portion 32 is designed to the structure of variable cross-section, rotating sheet 3 can not only be ensured
It is flipped up at a particular pressure, also effectively increases the area of passage of the inner ring of connecting portion 32, reduces what rotating sheet 3 was blown
Probability, so as to be effectively reduced the danger that electrokinetic cell is on fire or explodes, it further enhancing the safety of electrokinetic cell
Performance.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, boss 3 is solid construction, connecting portion
32 be sheet annuli arrangement, and the thickness of boss 3 is more than the thickness of connecting portion 32.Contacted due to rotating sheet 3 with matrix part 21
Position is the neck region of excessively stream, therefore very big in rotating sheet 3 and the Contact electric current of matrix part 21, easily causes contact position
Local melting.The structure of stop block 4 is thus powered up by solid boss 3, it is ensured that rotating sheet 3 is not blown under high current, from
And be effectively reduced electrokinetic cell and on fire or blast danger occurs, drastically increase the security performance of electrokinetic cell.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, the connecting portion 32 and water of rotating sheet 3
The angle that plane is formed is 6~60 °, preferably 10~30 °.Wherein α specific value can be configured according to being actually needed,
And different setting angles can influence the action that rotating sheet 3 is flipped up.When α values are too small, cause boss 3 and resistance bolck 4
Hypotelorism, so rotating sheet 3 easily occurs misconnection with resistance bolck 4 and makes battery failure under normal circumstances;When α values are excessive,
So that the center of gravity of rotating sheet 3 reduces, the resistance that rotating sheet 3 acts upwards is adds somewhat to, may so cause to overturn
Piece 3 acts lag upwards, so as to influence the security performance of battery.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, the resistance size of resistance bolck 4 is 0.1
~1000m Ω.If the resistance of resistance bolck 4 is too low, the conveyance capacity of resistance bolck 4 can be substantially reduced, can not so meet electric conductivity
Energy demand, does not have the effect of being effectively protected;If the resistance of resistance bolck 4 is too high, the conveyance capacity of resistance bolck 4 can be greatly increased,
It can not so make battery before thermal runaway occurs by electric current abrupt release, while can not also cancel Fuse structures, and then can not carry
The energy density of high electrokinetic cell.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, the eversion pressure of rotating sheet 3 is
0.01~1.2Mpa, preferably 0.1~0.8Mpa.If eversion pressure is excessive, safety protection function is not had;If eversion pressure mistake
It is small, influence the normal use of electrokinetic cell.
In the embodiment according to electrokinetic cell cap assembly of the present utility model, coping plate 1, which is provided with, to be protruded from
The convex closure on surface, convex closure form convex closure resettlement section in the lower surface of coping plate 1, and pole mounting hole 11 and connecting hole may be contained within convex
In bag.It will be moved into during installation on negative terminal 2 and positive terminal 9 in the convex closure resettlement section of coping plate 1, ensureing electrokinetic cell basic nature
While energy, the height of negative terminal 2 and positive terminal 9 in enclosure interior is reduced, bigger installing space has been vacateed to battery core, from
And the energy density of electrokinetic cell is set to get a promotion.
In addition, the utility model also provides a kind of electrokinetic cell using above-mentioned cap assembly, including battery core, housing and top
Cap assemblies, battery core are placed in housing, and cap assembly is sealingly mounted on housing.
Compared to prior art, the utility model makes rotating sheet 3 add resistance bolck 4, and the resistance control of resistance bolck 4 is set by adjusting
Protective current processed, when electrokinetic cell internal pressure increases to the eversion pressure of rotating sheet 3, rotating sheet 3 is flipped up, and makes resistance
Block 4 electrically connects with the matrix part 21 of pole, forms low discharging current, reduces the capacitance of battery, released the energy of aggregation
Put, so as to avoid battery that thermal runaway occurs, ensure the security performance of battery;In addition, cap assembly of the present utility model can also save
But the setting of fuse (Fuse) structure, reduces its space-consuming in inside battery, effectively increases the energy of electrokinetic cell
Density.
The announcement and teaching of book according to the above description, the utility model those skilled in the art can also be to above-mentioned realities
The mode of applying is changed and changed.Therefore, the utility model is not limited to above-mentioned embodiment, every this area skill
It is new that art personnel any conspicuously improved, replacement or modification made on the basis of the utility model belong to this practicality
The protection domain of type.In addition, although used some specific terms in this specification, but these terms are intended merely to conveniently say
It is bright, any restrictions are not formed to the utility model.