CN107248554A - Top cover structure of power battery and electrokinetic cell - Google Patents
Top cover structure of power battery and electrokinetic cell Download PDFInfo
- Publication number
- CN107248554A CN107248554A CN201710502072.XA CN201710502072A CN107248554A CN 107248554 A CN107248554 A CN 107248554A CN 201710502072 A CN201710502072 A CN 201710502072A CN 107248554 A CN107248554 A CN 107248554A
- Authority
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- China
- Prior art keywords
- top cover
- rotating sheet
- power battery
- coping plate
- resistance bolck
- 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.)
- Pending
Links
- 230000010485 coping Effects 0.000 claims abstract description 36
- 239000011159 matrix material Substances 0.000 claims abstract description 25
- 239000004033 plastic Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 230000002776 aggregation Effects 0.000 abstract description 6
- 238000004220 aggregation Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000001965 increasing effect Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 208000032953 Device battery issue Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 Copper-Aluminum compound Chemical class 0.000 description 1
- 206010057855 Hypotelorism of orbit Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/598—Guarantee labels
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to power battery technology field, more particularly to a kind of top cover structure of power battery and electrokinetic cell, the cap structure includes coping plate, negative terminal and rotating sheet, negative terminal insulate with coping plate to be assembled, and coping plate is provided with connecting hole, rotating sheet sealing connecting hole, negative terminal includes matrix part and the trunk portion extended downwardly by matrix part, matrix part is provided with the groove corresponding with connecting hole, and groove is provided with resistance bolck, and resistance bolck is oppositely arranged with rotating sheet.Compared to prior art; the present invention adds resistance bolck in the matrix part of negative terminal; 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 electrically connected with resistance bolck, is formed low discharging current, is released the energy of aggregation; battery is avoided to occur thermal runaway, it is ensured that the security performance of battery；In addition, the cap structure of the present invention can also save the setting of Fuse structures in existing battery, the energy density of electrokinetic cell is effectively increased.
Description
Technical field
The invention belongs to power battery technology field, more particularly to a kind of top cover structure of power battery and use the top cover knot
The electrokinetic cell of structure.
Background technology
Electric automobile and energy-accumulating power station etc., which are generally required, uses the electrokinetic cell with Large Copacity as power supply.These power
Battery with good security and longer cycle life etc. except that with high power capacity, should also can be only achieved the mark used
Demand that is accurate and meeting people.
Wherein, when electrokinetic cell is overcharged, 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 be 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 is overcharged, 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
Show, realize the function of the external short circuit structure using rotating sheet 1 ' in the prior art, the rotating sheet 1 ' one piece of disk of use, and
Disk center sets a cylindrical boss.When normally use, rotating sheet 1 ' is with the pole 2 ' on electrokinetic cell top cover
Disconnect insulation.When electrokinetic cell is overcharged 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 ' is electrically connected with pole 2 ', so as to be formed back in electrokinetic cell
Road so that Fuse fuses, 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
The moment contacted in rotating sheet with aluminium block can produce a high current, be easily caused 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, causing 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.
The content of the invention
It is an object of the invention to：In view of the shortcomings of the prior art, electrokinetic cell security can be improved by providing one kind
The top cover structure of power battery of energy and energy density, and the electrokinetic cell using this cap structure is provided.
To achieve these goals, the present invention uses following technical scheme：
A kind of top cover structure of power battery, including coping plate, negative terminal and rotating sheet, the negative terminal and the coping plate
Insulation assembling, the coping plate is 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, described matrix portion is provided with the groove corresponding with the connecting hole, the groove
Resistance bolck is provided with, the resistance bolck is oppositely arranged with the rotating sheet, when electrokinetic cell internal pressure exceedes turning over for rotating sheet
When turning pressure, the rotating sheet is flipped up so that the rotating sheet is electrically connected with the resistance bolck.
Improved as one kind of top cover structure of power battery of the present invention, the material of the resistance bolck is carborundum, graphite and
At least one of polyphenylene sulfide；The resistance bolck that the material makes is fully able to meet chemical property demand.
Improved as one kind of top cover structure of power battery of the present invention, the resistance size of the resistance bolck is 0.1~1000m
Ω.If the resistance of resistance bolck is too low, the conveyance capacity of resistance bolck can be substantially reduced, electric conductivity demand can not be so met, risen
Less than being effectively protected effect；If the resistance of resistance bolck is too high, the conveyance capacity of resistance bolck can be greatly increased, can not so make electricity
Pond, by electric current abrupt release, while can not also cancel Fuse structures, and then can not improve electrokinetic cell before occurring thermal runaway
Energy density.
Improved as one kind of top cover structure of power battery of the present invention, 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
The normal of electrokinetic cell is rung to use.
Improved as one kind of top cover structure of power battery of the present invention, the thickness size of the resistance bolck is 0.1~15mm.
If the thickness of resistance bolck is excessively thin, the conveyance capacity step-down of resistance bolck can be made, and electric conductivity demand can not be met, do not had effectively
Protective effect；If the thickness of resistance bolck is blocked up, the conveyance capacity of resistance bolck can be caused too high, can not so make battery in generation
By the energy abrupt release of aggregation before thermal runaway, while can not also cancel Fuse structures, and then the energy of electrokinetic cell can not be improved
Metric density.
Improved as one kind of top cover structure of power battery of the present invention, the coping plate is additionally provided with pole mounting hole, institute
State negative terminal to electrically connect with conductive matrix through the pole mounting hole, be provided between the trunk portion and the coping plate absolutely
Edge sealing ring, is provided with insulated plastic part between described matrix portion and the coping plate, the resistance bolck passes through described exhausted
Edge plastic parts is fixed on the groove, is provided between the coping plate, the insulated enclosure circle and the conductive matrix lower exhausted
Edge plastic parts.
Improved as one kind of top cover structure of power battery of the present invention, the coping plate, which is provided with, protrudes from the convex of upper surface
Bag, the convex closure is in the lower surface formation convex closure resettlement section of the coping plate, and the pole mounting hole and the connecting hole are all provided with
It is placed in the convex closure.It will be moved into during installation on pole in the convex closure resettlement section of coping plate, ensureing electrokinetic cell basic performance
While, height of the pole in enclosure interior is reduced, bigger installing space has been vacateed to battery core, so that electrokinetic cell
Energy density gets a promotion.
Improved as one kind of top cover structure of power battery of the present invention, the rotating sheet includes weld part, boss and set
The connecting portion being placed between the weld part and the boss, the boss is arranged on the middle position of the connecting portion, described
Weld part is arranged on the outward flange of the connecting portion, and the weld part is electrically connected with the coping plate.
Improved as one kind of top cover structure of power battery of the present invention, the weld part, the boss and the connection
The integrated attachment structure in portion.
Improved as one kind of top cover structure of power battery of the present invention, the thickness of the connecting portion is from boss to weld part
Direction on be gradually reduced.Connecting portion is designed to the structure of variable cross-section, can not only ensure rotating sheet at a particular pressure to
Upper upset, also effectively increases the area of passage of connecting portion inner ring, the probability that rotating sheet is blown is reduced, so as to effective
Ground reduces the danger that electrokinetic cell is on fire or explodes, and further enhancing the security performance of electrokinetic cell.
Improved as one kind of top cover structure of power battery of the present invention, the boss is solid construction, the connecting portion is
Sheet annuli arrangement, and thickness of the thickness more than the connecting portion of the boss.The position contacted due to boss with resistance bolck
It is the neck region of excessively stream, thus it is very big in boss and resistance bolck Contact electric current, it is easily caused contact position local melting.
By increasing thickness, the boss of solid construction can be caused to increase with the area of passage of resistance bolck contact surface, it is ensured that under high current
Can not first fuse boss, so that being effectively reduced electrokinetic cell occurs on fire or blast danger, drastically increase power
The security performance of battery.
Improved as one kind of top cover structure of power battery of the present invention, connecting portion and the horizontal plane formation of the rotating sheet
Angle is 6~60 °, preferably 10~30 °.Wherein α specific value can be configured according to actual needs, and different be set
Angle setting degree 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 the center of gravity of rotating sheet
Reduction, adds somewhat to the resistance that rotating sheet is acted upwards, may so cause rotating sheet act upwards generation it is delayed,
So as to influence the security performance of battery.
In addition, present invention also offers a kind of electrokinetic cell, including battery core, housing and cap structure, the battery core is placed in
In the housing, the cap structure is sealingly mounted on the housing, and the cap structure is described in any of the above-described paragraph
Cap structure.
Compared to prior art, the beneficial effects of the present invention are：The present invention adds resistance bolck in the matrix part of negative terminal,
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 rotating sheet is electrically connected with resistance bolck, forms low discharging current, is reduced the capacitance of battery, is made aggregation
Energy be released so that avoid battery occur thermal runaway, it is ensured that the security performance of battery；In addition, the top cover knot of the present invention
Structure can also save the setting of fuse (Fuse) structure, reduce its space-consuming in inside battery, effectively increase power electric
The energy density in pond.
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 the top cover structure of power battery of the present invention.
The partial enlarged drawing that Fig. 3 is A in Fig. 2.
Fig. 4 is the structure decomposition figure of the top cover structure of power battery of the present invention.
In figure：1- coping plates；11- pole mounting holes；2- negative terminals；21- matrix parts；22- trunk portions；3- rotating sheets；4-
Resistance bolck；5- conduction matrixs；6- insulated enclosure circles；The upper insulated plastic parts of 7-；Insulated plastic part under 8-；9- positive terminals.
Embodiment
It is attached below in conjunction with embodiment and specification to make technical scheme and advantage clearer
Figure, is described in further detail to the present invention and its advantage, but the implementation of the present invention is not limited to this.
As shown in figs. 2 to 4, a kind of top cover structure of power battery, including coping plate 1, negative terminal 2, positive terminal 9 and rotating sheet
3, negative terminal 2 insulate with coping plate 1 to be assembled, 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, the sealing connecting hole of rotating sheet 3, 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, is provided with resistor disc, coping plate 1, insulated enclosure circle 6 and conductive base 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；, can be in negative terminal 2 more preferably to distinguish positive and negative terminals
Surface marking negative pole mark, positive terminal 9 surface marking positive pole mark；The matrix part 21 of negative terminal 2 is provided with and connected
The corresponding groove in hole, groove is provided with resistance bolck 4, and resistance bolck 4 is fixed on groove by upper insulated plastic part 7, resistance bolck 4 with
Rotating sheet 3 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 rotating sheet 3 to electrically connect with resistance bolck 4, form low discharging current, reduce the SOC of battery, be released the energy of aggregation, from
And avoid battery from occurring thermal runaway, it is ensured that 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, boss and the connecting portion being arranged between weld part and boss, and boss is set
Put in the middle position of connecting portion, weld part is arranged on the outward flange of connecting portion, and weld part is electrically connected with coping plate；It is preferred that
Ground, weld part, boss and the integrated attachment structure of connecting portion.
In an embodiment of the top cover structure of power battery according to the present invention, the resistance size of resistance bolck 4 for 0.1~
1000mΩ.If the resistance of resistance bolck 4 is too low, the conveyance capacity of resistance bolck 4 can be substantially reduced, electric conductivity can not be so met
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, this
Sample can not be such that battery, by electric current abrupt release, while can not also cancel Fuse structures, and then can not be improved before occurring thermal runaway
The energy density of electrokinetic cell.
In an embodiment of the top cover structure of power battery according to the present invention, the eversion pressure of rotating sheet 3 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
The normal of electrokinetic cell is rung to use.
In an embodiment of the top cover structure of power battery according to the present invention, the thickness size of resistance bolck 4 for 0.1~
15mm.If the thickness of resistance bolck 4 is excessively thin, the conveyance capacity step-down of resistance bolck 4 can be made, and electric conductivity demand can not be met, risen
Less than being effectively protected effect；If the thickness of resistance bolck 4 is blocked up, the conveyance capacity of resistance bolck 4 can be caused too high, can not so made
Battery, by the energy abrupt release of aggregation, while can not also cancel Fuse structures, and then can not be improved dynamic before occurring thermal runaway
The energy density of power battery.
In an embodiment of the top cover structure of power battery according to the present invention, coping plate, which is provided with, protrudes from upper surface
Convex closure, convex closure is in the lower surface formation convex closure resettlement section of coping plate, and pole mounting hole 11 and connecting hole may be contained within convex closure.Peace
It will be moved into during dress on negative terminal 2 and positive terminal 9 in the convex closure resettlement section of coping plate, ensureing the same of electrokinetic cell basic performance
When, the height of negative terminal 2 and positive terminal 9 in enclosure interior is reduced, bigger installing space has been vacateed to battery core, so that dynamic
The energy density of power battery gets a promotion.
In an embodiment of the top cover structure of power battery according to the present invention, the thickness of connecting portion is from boss to welding
It is gradually reduced on the direction in portion.Connecting portion is designed to the structure of variable cross-section, rotating sheet 3 can not only be ensured at a particular pressure
It is flipped up, also effectively increases the area of passage of connecting portion inner ring, reduces the probability that rotating sheet 3 is blown, so as to
The danger that electrokinetic cell is on fire or explodes is effectively reduced, the security performance of electrokinetic cell is further enhancing.
In an embodiment of the top cover structure of power battery according to the present invention, boss is solid construction, and connecting portion is piece
Shape annuli arrangement, and thickness of the thickness more than connecting portion of boss.Because boss and the position that resistance bolck 4 is contacted are the bottles of excessively stream
Neck region, thus it is very big in boss and the Contact electric current of resistance bolck 4, it is easily caused contact position local melting.Pass through increase
Thickness, can cause the boss of solid construction to increase with the area of passage of the contact surface of resistance bolck 4, it is ensured that can not first be melted under high current
Disconnected boss, so that being effectively reduced electrokinetic cell occurs on fire or blast danger, drastically increases the peace of electrokinetic cell
Full performance.
In an embodiment of the top cover structure of power battery according to the present invention, connecting portion and the horizontal plane shape of rotating sheet 3
Into angle be 6~60 °, preferably 10~30 °.Wherein α specific value can be configured according to actual needs, and different
Setting angle can influence the action that rotating sheet 3 is flipped up.When α values are too small, cause the distance mistake of boss and resistance bolck 4
Closely, 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 turn over
The center of gravity reduction of rotor 3, adds somewhat to the resistance that rotating sheet 3 is acted upwards, so rotating sheet 3 may be caused upward
Action generation is delayed, so as to influence the security performance of battery.
In addition, the present invention also provides a kind of electrokinetic cell using above-mentioned cap structure, including battery core, housing and top cover knot
Structure, battery core is placed in housing, and cap structure is sealingly mounted on housing.
Compared to prior art, the present invention adds resistance bolck 4 in the matrix part 21 of negative terminal 2, and resistance bolck 4 is set by adjusting
Resistance controls protective current, and when electrokinetic cell internal pressure increases to the eversion pressure of rotating sheet 3, rotating sheet 3 is flipped up,
Rotating sheet 3 is electrically connected with resistance bolck 4, form low discharging current, reduce the SOC of battery, be released the energy of aggregation, from
And avoid battery from occurring thermal runaway, it is ensured that the security performance of battery；In addition, the cap structure of the present invention can also save fuse
(Fuse) setting of structure, reduces its space-consuming in inside battery, effectively increases the energy density of electrokinetic cell.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in above-mentioned embodiment, every those skilled in the art exist
Made any conspicuously improved, replacement or modification belong to protection scope of the present invention on the basis of the present invention.This
Outside, although having used some specific terms in this specification, these terms merely for convenience of description, not to the present invention
Constitute any limitation.
Claims (10)
1. a kind of top cover structure of power battery, including coping plate, negative terminal and rotating sheet, the negative terminal and the coping plate are exhausted
Edge is assembled, and the coping plate is provided with connecting hole, and the rotating sheet seals the connecting hole, it is characterised in that：The negative terminal
The trunk portion extended downwardly including matrix part and by matrix part, described matrix portion is provided with corresponding with the connecting hole recessed
Groove, the groove is provided with resistance bolck, and the resistance bolck is oppositely arranged with the rotating sheet, when electrokinetic cell internal pressure exceedes
During the eversion pressure of rotating sheet, the rotating sheet is flipped up so that the rotating sheet is electrically connected with the resistance bolck.
2. top cover structure of power battery according to claim 1, it is characterised in that：The material of the resistance bolck is carbonization
At least one of silicon, graphite and polyphenylene sulfide.
3. top cover structure of power battery according to claim 1, it is characterised in that：The resistance size of the resistance bolck is
0.1~1000m Ω.
4. top cover structure of power battery according to claim 1, it is characterised in that：The eversion pressure of the rotating sheet is
0.01~1.2Mpa.
5. top cover structure of power battery according to claim 1, it is characterised in that：The thickness size of the resistance bolck is
0.1~15mm.
6. top cover structure of power battery according to claim 1, it is characterised in that：The coping plate is additionally provided with pole peace
Hole is filled, the negative terminal is electrically connected through the pole mounting hole with conductive matrix, between the trunk portion and the coping plate
Insulated enclosure circle is provided with, insulated plastic part is provided between described matrix portion and the coping plate, the resistance bolck passes through
The upper insulated plastic part is fixed on the groove, is set between the coping plate, the insulated enclosure circle and the conductive matrix
It is equipped with lower insulated plastic part.
7. top cover structure of power battery according to claim 6, it is characterised in that：The coping plate, which is provided with, to be protruded from
The convex closure on surface, the convex closure is in the lower surface formation convex closure resettlement section of the coping plate, the pole mounting hole and the company
Hole is connect to may be contained within the convex closure.
8. top cover structure of power battery according to claim 1, it is characterised in that：The rotating sheet includes weld part, convex
Platform and the connecting portion being arranged between the weld part and the boss, the boss are arranged on the central position of the connecting portion
Put, the weld part is arranged on the outward flange of the connecting portion, the weld part is electrically connected with the coping plate.
9. top cover structure of power battery according to claim 8, it is characterised in that：The boss is solid construction, described
Connecting portion be sheet annuli arrangement, and the boss thickness be more than the connecting portion thickness.
10. a kind of electrokinetic cell, including battery core, housing and cap structure, the battery core are placed in the housing, the top cover knot
Structure is sealingly mounted on the housing, it is characterised in that：The cap structure is the top cover described in any one of claim 1~9
Structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710502072.XA CN107248554A (en) | 2017-06-27 | 2017-06-27 | Top cover structure of power battery and electrokinetic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710502072.XA CN107248554A (en) | 2017-06-27 | 2017-06-27 | Top cover structure of power battery and electrokinetic cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107248554A true CN107248554A (en) | 2017-10-13 |
Family
ID=60014090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710502072.XA Pending CN107248554A (en) | 2017-06-27 | 2017-06-27 | Top cover structure of power battery and electrokinetic cell |
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| Country | Link |
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| CN (1) | CN107248554A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732094A (en) * | 2017-11-16 | 2018-02-23 | 北京国能电池科技有限公司 | Over-charging of battery safety guard and lithium ion battery |
| CN109935746A (en) * | 2019-04-02 | 2019-06-25 | 瑞浦能源有限公司 | Power battery rotating sheet, power battery top cover and power battery |
| CN109994699A (en) * | 2018-01-03 | 2019-07-09 | 宁德时代新能源科技股份有限公司 | Secondary battery and automobile |
| WO2022237068A1 (en) * | 2021-05-11 | 2022-11-17 | 江苏正力新能电池技术有限公司 | Structure for preventing thermal runaway of battery, battery case and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107732094A (en) * | 2017-11-16 | 2018-02-23 | 北京国能电池科技有限公司 | Over-charging of battery safety guard and lithium ion battery |
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| WO2022237068A1 (en) * | 2021-05-11 | 2022-11-17 | 江苏正力新能电池技术有限公司 | Structure for preventing thermal runaway of battery, battery case and battery |
| WO2024124634A1 (en) * | 2022-12-12 | 2024-06-20 | 湖北亿纬动力有限公司 | Power battery cover and power battery |
| CN115882171A (en) * | 2023-02-09 | 2023-03-31 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| CN115882171B (en) * | 2023-02-09 | 2023-05-16 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
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