CN108666458A - Battery cover board assembly, single battery, battery modules, power battery pack and electric vehicle - Google Patents

Battery cover board assembly, single battery, battery modules, power battery pack and electric vehicle Download PDF

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Publication number
CN108666458A
CN108666458A CN201710209510.3A CN201710209510A CN108666458A CN 108666458 A CN108666458 A CN 108666458A CN 201710209510 A CN201710209510 A CN 201710209510A CN 108666458 A CN108666458 A CN 108666458A
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CN
China
Prior art keywords
battery
cover board
electrode
terminal
gas
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.)
Granted
Application number
CN201710209510.3A
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Chinese (zh)
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CN108666458B (en
Inventor
杨珂利
蒋露霞
鲁鹏
程晗
胡世超
朱建华
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN201710209510.3A priority Critical patent/CN108666458B/en
Priority to PCT/CN2018/079240 priority patent/WO2018177138A1/en
Publication of CN108666458A publication Critical patent/CN108666458A/en
Application granted granted Critical
Publication of CN108666458B publication Critical patent/CN108666458B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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 of a single cell or a single battery
    • 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
    • H01M50/543—Terminals
    • 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
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

This disclosure relates to a kind of battery cover board assembly, single battery, battery modules, power battery pack and electric vehicle, the battery cover board assembly includes cover board, electrode inner terminal and electrode external terminal, electrode inner terminal and electrode external terminal are electrically connected by current interruptions structure, battery cover board assembly include for fill can aerogenesis medium and mounted on cover board outside seal chamber, seal chamber be constructed so that can aerogenesis medium be electrically connected respectively with battery plus-negative plate, when voltage difference overrate between the voltage difference between battery plus-negative plate, can aerogenesis medium can generate gas, to break through seal chamber under the gas pressure of the gas so that gas enters the inside of battery and is passed to current interruptions structure to disconnect the electrical connection between electrode inner terminal and electrode external terminal by gas pressure.Cover plate assembly has the gas generation mechanism independently of inside battery, and it is that current interruptions structure establishes air pressure to generate gas in time, breaks current interruptions structure in time, promotes the safety of battery.

Description

Battery cover board assembly, single battery, battery modules, power battery pack and electric vehicle
Technical field
This disclosure relates to field of batteries, and in particular, to a kind of battery cover board assembly, the list using the battery cover board assembly The power battery pack of the battery modules including the battery modules of body battery including the single battery and including the power battery pack Electric vehicle.
Background technology
The technical solution of existing CID (Current Interrupt Device, current interrupt device) is usually in battery It is inside provided with the structure of breaking of induction air pressure, battery is under the extreme cases such as thermal runaway, between electrolyte inside and electrode material Reaction can make inside battery generate bulk gas, cause internal pressure to increase when inside battery gas increases, increased pressure The rotating sheet that power to break in structure is overturn outward, to break the split pieces with local reduction.
The shortcomings of the prior art mainly has following three points：
1, at over-charging of battery initial stage, the gas that inside battery generates is less, can not disconnect in time and break structure.
2, when cell internal pressure is higher, battery has occurred and that thermal runaway phenomenon at this time, and structure is broken even if disconnecting The effect of protection battery is not had.
3, when battery break pressure it is larger when, start pressure increase, can not disconnect in time and break structure；And works as and break pressure When smaller, breaking structure may just disconnect in battery liquid-filling, high temperature storage.
Above structure is not particularly suitable in ternary material.Because ternary material activity is high, easily in short-term under extreme case Interior generation thermal runaway.And over-charging of battery initial stage, since its internal gas generated is very few, insufficient pressure is so that rotating sheet turns over Turn to break split pieces.And when cell internal pressure is excessively high, often battery has sentenced thermal runaway state, although at this time can be with Circuit is broken, but reacting to each other between inside battery material can not be terminated, still cannot play the role of protecting battery.
Invention content
Purpose of this disclosure is to provide a kind of battery cover board assembly that can promote battery security, use the battery cover board The power battery pack of the battery modules including the battery modules of the single battery of component including the single battery and dynamic including this The electric vehicle of power battery pack.
The disclosure provides a kind of battery cover board assembly, including cover board, electrode inner terminal and electrode external terminal, in the electrode It is electrically connected by the current interruptions structure on the cover board between terminal and the electrode external terminal, the battery cover board Component further include for fill can aerogenesis medium and mounted on the seal chamber in the outside of the cover board, the seal chamber is configured to make It is described can aerogenesis medium be electrically connected respectively with battery plus-negative plate, and between the voltage difference between the battery plus-negative plate When voltage difference overrate, it is described can aerogenesis medium can generate gas, it is described to be broken through under the gas pressure of the gas Seal chamber is so that the gas enters the inside of the battery and is passed to the current interruptions structure to pass through gas pressure Disconnect the electrical connection between the electrode inner terminal and the electrode external terminal.
Optionally, the rated value value range is 4.5v~5v.
Optionally, it is described can aerogenesis medium include stupid biphenyl, tertiary pentyl, cyclohexyl benzene, terphenyl, cyclohexyl biphenyl and two At least one of benzofuran.
Optionally, the battery cover board assembly include respectively with it is described can the first polarity part for being in contact of aerogenesis medium and Second polarity part, one of the first polarity part and the second polarity part with anode for being electrically connected, another one For being electrically connected with battery cathode, the first polarity part is sealed and is insulated and is connected on the second polarity part, with whole shape As the hood-like structure being open towards inside battery, the opening in the cover body structure is also sealedly connected with pressure release part to surround Seal chamber is stated, the pressure release part can rupture under the gas pressure to allow the inside of battery described in the gas flow.
Optionally, the second polarity part is fixed on the cover board to pass through the cover board and the anode or electricity Pond cathode electrical connection.
Optionally, be formed with mounting hole on the cover board, the second polarity part be installed on the inner wall of the mounting hole with So that the opening of the hood-like structure is towards the inside battery.
Optionally, the first polarity part is electrically connected by conductive connecting piece with the electrode terminal for exposing the cover board.
Optionally, it is formed with the first indentation on the pressure release part, which can disconnect under the gas pressure So that the gas is released via the pressure release part.
Optionally, the pressure release part is formed to have the pressure relief plate of first indentation, and decrease is formed on the pressure relief plate Deep gouge, first indentation are located in the groove bottom wall of the decrease deep gouge.
Optionally, first indentation is formed as both ends non-rectilinear linear structure spaced apart.
Optionally, the non-rectilinear linear structure is formed as major arc structure.
Optionally, it is in the annular insulation strip of H-type structure with longitudinal section between the first polarity part and the second polarity part So that the first polarity part and the second polarity part insulate, the hood-like structure includes the cover body as the first polarity part Structure, and it is embedding as the edge difference that the cover edge structure of the second polarity part, the cover body structure and cover edge structure are close In the U-type groove for entering and being sealed to the opposite end of the H-type structure, the outer peripheral edge of the cover edge structure and the cover board stationary phase Even.
Optionally, medium injection hole is formed in the cover body structure, and there is detachably blocking on the medium injection hole Ground sealing-plug.
Optionally, first electrode terminal and the second electrode terminal, the first polarity part are installed on the cover board First electrode terminal close to the battery is arranged, and is electrically connected with the first electrode terminal, and the cover board and the battery The electrical connection of second electrode terminal, the current interruptions structure is mounted on the first electrode terminal or second electrode terminal.
Optionally, the current interruptions structure further include be connected electrically in the electrode inner terminal and the electrode external terminal it Between flip piece, the outer peripheral edge sealing of the flip piece and it is insulated be connected on the cover board, the sealing wrap with it is described The inner surface gas connection of flip piece, under the gas pressure of the gas, the flip piece action is to disconnect and the electricity The electrical connection of pole inner terminal.
Optionally, conduct piece is fixed on the outer end face of the electrode inner terminal, the flip piece is connected electrically in described lead The indentation that can be disconnected by the gas pressure of the gas is formed on electric part, and on the conduct piece, the indentation is around use In the tie point setting for connecting the flip piece.
Optionally, covering is also covered on the flip piece, the covering is electrically connected to form with the flip piece The electrode external terminal.
Optionally, the extraneous stomata of connection is formed on the covering.
The disclosure also provides a kind of single battery, which includes shell, the battery core that is contained in the shell, described Single battery is the battery cover board assembly that the disclosure provides, the cover board encapsulation shell, in the battery core and the electrode Terminal is electrically connected.
The disclosure also provides a kind of battery modules, and the monomer electricity of disclosure offer is provided in the battery modules Pond.
The disclosure also provides a kind of power battery pack, including backpack body and the battery modules being arranged in the backpack body, the electricity Pond module is the battery modules that the disclosure provides.
The disclosure also provides a kind of electric vehicle, which is provided with the power battery pack of disclosure offer.
Through the above technical solutions, the aerogenesis of the seal chamber in cover plate assembly can be produced independently of the gas of inside battery It is raw, therefore can be that current interruptions structure establishes air pressure in time, to break current interruptions structure in time, promote the safety of battery Property.
Other feature and advantage of the disclosure will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is for providing further understanding of the disclosure, and a part for constitution instruction, with following tool Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings：
Fig. 1 is the schematic cross-sectional view of the current interruptions structure provided according to the first embodiment of the disclosure；
Fig. 2 is the overlooking structure diagram of the second polarity part provided according to the first embodiment of the disclosure；
Fig. 3 is the schematic cross-sectional view of the current interruptions structure provided according to second of embodiment of the disclosure, wherein the Voltage difference between one polarity part and the second polarity part is no more than rated value；
Fig. 4 is the overlooking structure diagram of the dead ring provided according to second of embodiment of the disclosure；
Fig. 5 is the schematic cross-sectional view of the current interruptions structure provided according to second of embodiment of the disclosure, wherein the Voltage difference overrate between one polarity part and the second polarity part；
Fig. 6 is the schematic cross-sectional view of the current interruptions structure provided according to second of embodiment of the disclosure, wherein close Envelope intracavitary is filled with can aerogenesis medium；
Fig. 7 is the schematic cross-sectional view of the current interruptions structure provided according to the third embodiment of the disclosure, wherein the Voltage difference between one polarity part and the second polarity part is no more than rated value；
Fig. 8 is the overlooking structure diagram of the interior insulation ring provided according to the third embodiment of the disclosure；
Fig. 9 is the schematic cross-sectional view of the current interruptions structure provided according to the third embodiment of the disclosure, wherein the Voltage difference overrate between one polarity part and the second polarity part；
Figure 10 is the schematic cross-sectional view of the current interruptions structure provided according to the third embodiment of the disclosure, wherein close Envelope intracavitary is filled with can aerogenesis medium；
Figure 11 is the schematic cross-sectional view of the current interruptions structure provided according to the 4th kind of embodiment of the disclosure, wherein the Voltage difference between one polarity part and the second polarity part is no more than rated value；
Figure 12 is the schematic cross-sectional view of the current interruptions structure provided according to the 4th kind of embodiment of the disclosure, wherein the Voltage difference overrate between one polarity part and the second polarity part；
Figure 13 is the section view of the first embodiment of the current interruptions structure provided according to the 5th kind of embodiment of the disclosure Schematic diagram；
Figure 14 is the section view of the second embodiment of the current interruptions structure provided according to the 5th kind of embodiment of the disclosure Schematic diagram；
Figure 15 is the partial cutaway positioned at a position of the single battery provided according to the 6th kind of embodiment of the disclosure View；
Figure 16 is the partial enlarged view in the portions A in Figure 15；
Figure 17 is the partial cutaway positioned at another location of the single battery provided according to the 6th kind of embodiment of the disclosure View；
Figure 18 is the partial perspective view of the longitudinally cutting of the single battery provided according to the 6th kind of embodiment of the disclosure；
Figure 19 is the partial perspective view of the single battery provided according to the 6th kind of embodiment of the disclosure；
Figure 20 is the dimensional structure diagram of the pressure release part provided according to the 6th kind of embodiment of the disclosure；
Figure 21 is the partial sectional view of the longitudinally cutting of the single battery provided according to the 7th kind of embodiment of the disclosure；
Figure 22 is the partial schematic diagram of the left end in Figure 21；
Figure 23 is the partial schematic diagram of the right end in Figure 21；
Figure 24 is the schematic side view of the sealing packet provided according to the 7th kind of embodiment of the disclosure；
Figure 25 is the diagrammatic cross-section that the hatching A-A in Figure 24 is cutd open.
Specific implementation mode
The specific implementation mode of the disclosure is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched The specific implementation mode stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
In the disclosure, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, left and right " be typically with It is defined on the basis of the page of respective drawings, " inside and outside " refers to the inner and outer of corresponding component profile.Wherein, it relates to herein And the description of outer end, inner end, inward-outward direction, such as inner terminal, external terminal, inner face, outer end face are the axial directions along pole For inside and outside battery, and relative to " inside and outside " of ring-shaped article, such as outer peripheral edge, outer ring, inner ring are then radially Direction is defined relative to the center of the ring-shaped article.
As shown in Fig. 1 to Figure 25, present disclose provides battery cover board assembly, the monomer electricity of the battery cover board assembly is used Pond, the battery modules using the single battery, the power battery pack using the battery modules and the electricity using the power battery pack The technical solution of electrical automobile.Wherein battery cover board assembly is arranged on single battery, and multiple single batteries pass through serial or parallel connection At battery modules, and it can be placed in battery pack and form power battery pack.In addition, in addition to power battery pack field, the present invention The various technical solutions of middle offer can also be widely used in other field of batteries.In addition, the battery cover board in the disclosure Component both can be that can be assembled on the shell of single battery to constitute the modular assembly of single battery, or with monomer The other parts of such as battery core in battery constitute indivisible integrally-built partial structurtes, and the disclosure does not limit this System, belongs among the protection domain of the disclosure.
In order to understand that the technical solution of the disclosure, the disclosure are illustrated by seven kinds of embodiments.But be not limited to this seven Kind embodiment, and the feature in each embodiment can continue arbitrary combination or replacement.Wherein in the various of the disclosure In possible embodiment, the battery cover board assembly of the offer may include cover board and the electrode tip that is installed on cover board Son, electrode terminal include electrode inner terminal and electrode external terminal again, and wherein electrode inner terminal with battery core for being electrically connected, outside electrode Terminal is used to be connected with other monomers battery or battery modules etc., realizes outputting and inputting for the electric current of the battery core of single battery. In order to play safety effect, it is electrically connected by current interruptions structure between electrode inner terminal and electrode external terminal, in the electric current Disconnected structure can be pulled off under gas pressure, and the electric current to disconnect single battery is output and input.It is provided by the invention Cover plate assembly has the gas generation mechanism independently of inside battery, to be that current interruptions structure is built by generating gas in time Vertical air pressure promotes the safety of battery to break current interruptions structure in time.
In various embodiments, the generation of gas can be by the way that storage can aerogenesis Jie in battery cover board assembly in advance Matter, for example, establish seal chamber come store can aerogenesis medium, and make this can aerogenesis medium be located among the positive and negative anodes of battery, i.e., For can aerogenesis medium establish voltage, when unexpected due to occurring overcharging in battery etc., voltage difference between the positive and negative anodes of battery can be by Edge up height, so only need to design can aerogenesis medium can in the voltage difference overrate between acting on battery plus-negative plate, Gas can be generated, you can to disconnect the electricity between electrode inner terminal and electrode external terminal in time under the gas pressure of the gas Flow the electrical connection of interrupt structure.
Specifically, can by the way that the rated value is set as operating voltage corresponding when battery is in thermal runaway initial stage, In other words, which is set below the decomposition voltage of the electrolyte in battery, such as can be by the rated value value range For 4.5v~5v.Therefore, when single battery is under conventional sense, pair can aerogenesis medium generate voltage difference be no more than the volume Definite value, thus this can aerogenesis medium do not react, not will produce gas, thus single battery can normally carry out charge and discharge electrician Make；And when single battery will be close to precarious position, such as battery is in thermal runaway initial stage, pair can aerogenesis medium generate voltage Difference be more than the rated value, therefore this can aerogenesis medium can decompose generation bulk gas, the electric current under the gas pressure of the gas Interrupt structure is pulled off, to disconnect the input or output of the electric current of battery in time.It specifically, can be with turn-off current interrupt structure In any one parts itself two parts of structure or arbitrary neighborhood between electrical connection.
Therefore, the battery cover board assembly that the various embodiments of the disclosure provide can ensure battery to overcharge initial stage rapid Electric current is cut off, the electrode material of activity high (such as ternary material) is especially suitable for.Compared to aerogenesis is added in the electrolyte of battery The method of additive, the disclosure provide can aerogenesis medium be not in contact with the positive and negative pole material of battery and electrolyte, do not occur Side reaction does not have harmful effect to battery capacity and service life.Meanwhile this can aerogenesis medium usage amount it is small, far smaller than battery Electrolyte, battery security further increases.
In embodiment of the present disclosure, in order to enable can aerogenesis medium decomposition voltage value range be 4.5v~ 5v so that can aerogenesis medium bulk gas is generated under the decomposition voltage less than electrolyte, specifically this can aerogenesis medium May include biphenyl (decomposition voltage 4.5v), tertiary pentyl stupid (decomposition voltage 4.7v), cyclohexyl benzene (decomposition voltage 4.7v), three At least one in benzene (decomposition voltage 4.5v), cyclohexyl biphenyl (decomposition voltage 4.5v) and dibenzofurans (decomposition voltage 4.5v) Person.
Further, in order to increase can aerogenesis medium resolution ratio, to improve the spirit of current interruptions structure turn-off current Sensitivity, when use can by it is above-mentioned can aerogenesis medium and lithium salts (such as LiPF6) be dissolved into organic solvent as solute, such as it is molten It solves in the DMC (Dimethyl Carbonate, dimethyl carbonate) as solvent, since lithium salts can increase conductivity, To greatly improve can aerogenesis medium resolution ratio, promoted interrupt structure turn-off current sensitivity.Wherein, above-mentioned lithium Salt, DMC and can aerogenesis medium can be mixed and be filled into seal chamber 103 with any appropriate ratio.Preferably, with the sealing The volume of chamber 103 is 100% meter, and the content of the lithium salts is 5%~30%, and the content of the DMC is 5%~30%.In addition, due to It is above-mentioned by lithium salts, can the solution that is constituted of aerogenesis medium and organic solvent there is certain thermal conductivity, needs can be reduced and flowed through The fever of the tie point between two neighboring parts in the current interruptions structure of electric current, overcurrent Wen Sheng, especially work as battery In the case of there is instantaneous large-current in use, heat-transfer effect is especially apparent, to further increase the safety of battery. In addition, this can aerogenesis medium there is certain gasification point, when external short circuit occurs for such as battery, the heat for gathering generation also can It is enough so that can the gasification of aerogenesis medium, increase the air pressure inside of seal chamber, the electric current that battery is disconnected to pass through the mechanical structure passes It passs, plays the role of overcurrent protection.It should be noted that above-mentioned solution is not limited to liquid, can also be colloidal sol, such as can To be formed as gelatinous solution.
In various embodiments of the present disclosure, current interruptions structure may each be the mechanical structure for capableing of induction air pressure. Specifically, when battery is in thermal runaway initial stage, the mechanical structure can aerogenesis medium generate gas gas pressure under Disconnect the electric current flowed through.Specifically it can for example be connected by the component of breaking inner come the transmission of interruptive current, in time Cut off the charge and discharge of battery.Wherein can the mode of aerogenesis medium aerogenesis may include various modes, for example, ought such as battery in mistake When filling initial stage, can aerogenesis medium can the voltage difference of battery plus-negative plate effect under generate gas, then so that inside battery gas Pressure increases, or in another example, cause battery temperature to increase when exception occurs in use in battery, such as when electric current generation is outer When portion's short circuit, due to can aerogenesis medium there is certain gasification point, the heat that aggregation generates when battery short circuit is it is also possible that can Aerogenesis medium gasifies and discharges gas, to generate the Pneumatic pressure power of driving current interrupt structure.
In addition, each embodiment of the disclosure also provides a kind of single battery, including shell, it is contained in the shell Battery cover board assembly in battery core and the disclosure, wherein cover board be used for package casing, battery core then with corresponding electrode terminal phase Even, current path is output and input with establish corresponding single battery.Wherein in the electrode terminal for being equipped with current interruptions structure In, battery core is then connected by modes such as interior leading-out pieces with electrode inner terminal.In various embodiments of the present disclosure, it may be used The electrode terminal for being not provided with current interruptions structure is electrically connected with cover board, using cover board be seal chamber in can aerogenesis medium build The voltage of a vertical wherein pole, i.e. the mode such as second embodiment of cover board electrification.Furthermore it is also possible to be not provided with using by this The electrode terminal of current interruptions structure by the connector of conductive sheet directly in seal chamber can aerogenesis medium be electrically connected, and build Found the voltage of this pole, such as the uncharged first embodiment of cover board.In addition a kind of use is also provided in each embodiment The battery modules of the single battery, the power battery pack using the battery modules and the electric vehicle using the power battery pack.
In the following, the disclosure is by combining corresponding the first to the 7th embodiment of attached drawing pair to introduce involved battery cover board group Part 100,200,300,400,500,600,700.
First, as shown in Figure 1 to Figure 2, in the first embodiment of the disclosure, which, which has, uses In fill it is above-mentioned can aerogenesis medium seal chamber 103, seal chamber 103 be constructed so that can aerogenesis medium respectively with battery plus-negative plate Electrical connection, and when voltage difference overrate between battery plus-negative plate, can aerogenesis medium can generate gas, at this The electrical connection that the current interruptions structure between electrode inner terminal and electrode external terminal is disconnected under the gas pressure of gas, to promote electricity The safety in pond.
Wherein, battery cover board assembly include respectively with can the first polarity part 101 for being in contact of aerogenesis medium and the second polarity Part 102, one of the first polarity part 101 and the second polarity part 102 with anode for being connected, and another one is used for and battery Cathode be connected, i.e., by two polarity parts be can aerogenesis medium establish voltage difference.Wherein in embodiments, the first polarity part 101 are formed by electrode inner terminal and are insulated with cover board 104, and the second polarity part 102 seals and insulation is connected on cover board 104.That is, In the present embodiment, by electrode inner terminal and the second additional polarity part be can aerogenesis medium establish voltage, pass through in this way The second additional polarity part can make cover board 104 be not required to charge, and to improve the service life of cover board 104, and improve cell safety Property.
By taking such as the first of Fig. 1 and Fig. 2 embodiment as an example, in the present embodiment, current interruptions structure, which also has, to be used In the flip piece 105 as 103 partial sidewall of seal chamber, wherein pass through flip piece between electrode inner terminal and electrode external terminal 105 electrical connections, and under the gas pressure of gas, due to starting to accumulate gas in seal chamber 103, air pressure increases, so as to So that the flip piece as 103 side wall of seal chamber is acted to disconnect being electrically connected between electrode inner terminal and electrode external terminal It connects, specifically flip piece 105, which acts, can disconnect its being electrically connected with electrode inner terminal, can also disconnect and electrode external terminal Electrical connection or itself structural break.In the present embodiment, it is the electrical connection of disconnection flip piece 105 and electrode inner terminal.
Wherein in the different embodiments of the present invention, the side of the separated electrical connection of electrode inner terminal and flip piece is disconnected Formula can be different, can also will be at least one in the two wherein conductive structure disconnection that can be for conduct piece and flip piece between This body structure disconnect.Wherein, in the present embodiment, for the ease of machined electrode inner terminal, the outer end face of electrode inner terminal On be fixed with conduct piece 106, flip piece 105 is connected electrically on conduct piece 106, in this way can by some fault structures be arranged lead It is cumbersome to avoid the processing to electrode inner terminal on electric part.It can be by gas for example, can be formed on conduct piece 106 The indentation 115 that gas pressure disconnects, the indentation 115 surround the tie point for connecting flip piece 105 and are arranged.
In this way under gas pressure, this body structure of conduct piece 106 will be disconnected along indentation 115, so that flip piece 105 It is disconnected with electrode inner terminal.Except it is this by way of the decreases such as indentation by addition to the embodiment of the disconnection of this body structure, also In a manner of can be for example, by solder joint between the two be pulled the disconnection to realize electrical connection.Or the two will be connected to Between split pieces break with realize electrical connection disconnection.Specifically can in detail it be retouched in the 5th embodiment of the disclosure in following introduce It states.Therefore realize that the disclosure disconnects mechanical structure to cut off the purpose of the transmission of electric current under gas pressure.
In this way, by taking first embodiment as an example, when such as battery is when overcharging initial stage, can aerogenesis medium in the first polarity part Air pressure of the gas then in seal chamber 103 is will produce under the effect of the voltage difference of (electrode inner terminal) and the second polarity part to increase, this When under certain gas pressure, flip piece 105 by rotary movement make conduct piece 106 along indentation disconnect, to disconnect electricity Electrical connection between pole inner terminal and electrode external terminal connects with extraneous circuit to interrupt single battery, stops battery Charging, to avoid causing air pressure persistently to increase because of the electrolyte decomposition of inside battery, ensures the safety of battery.
As shown in Figure 1, in the present embodiment, the electrode inner terminal as the first polarity part 101 along inward-outward direction by prolonging The pole stretched is formed, and conduct piece 106 is for example by being welded to connect on the outer end face of pole to be electrically connected to each other.Specifically Ground, such as the pole can be electrically connected by interior leading-out piece, afflux conductive sheet etc. with battery core, to realize the first polarity part 101 It is connected with the positive or negative pole of battery.In addition, since battery is usually established by the pole and external circuitry that are arranged across cover board Current loop, therefore the mechanical structure for capableing of induction air pressure being made of conduct piece 106 and flip piece 105 is mounted on pole On, can the air pressure in seal chamber 103 directly be experienced by pole, high sensitivity, in addition avoid separately by the mechanical structure with Pole is attached, and facilitates processing.
In the disclosure, the generation type of the seal chamber in different embodiments can be different.Wherein can be by first Polarity part, the second polarity part and/or the mechanical structure for induction air pressure surround.That is the first polarity part, the second polarity part energy It enough realizes dual-use material, not only may act as being applied to positive and negative electrode that can be on aerogenesis medium, but also can be used to assist to form the seal chamber； Correspondingly, dual-use material can also be realized by capableing of the mechanical structure of induction air pressure, can be not only used for disconnect battery electric current input or Output, and can assist forming the seal chamber, it is cost-effective so as to reduce the amount of parts of single battery.In addition, sealing Chamber can also be individually formed via additional component, such as the sealing cavity formed in wrapper can be used as the seal chamber.
In the case where the mechanical structure of induction air pressure is used to surround seal chamber, when battery is in thermal runaway initial stage and routine When under state, which is connected with the mechanical structure always.It is not surrounded by the mechanical structure of induction air pressure in the seal chamber In the case of, only when battery is in thermal runaway initial stage, can aerogenesis medium generate gas pressure under so that mechanical structure It is connected to seal chamber, when battery is under conventional sense, which is isolated with seal chamber always.
In the first embodiment of the disclosure, flip piece 105 is coaxially disposed with pole and radially outward prolongs from pole It stretches, the side of pole is connected with the outer peripheral edge sealing and insulation of flip piece 105, so that the seal chamber 103 is formed about The toroidal cavity of the axis setting of pole.When increasing to the air pressure in seal chamber 103, flip piece 105 is enabled to act And it is electrically connected with pole disconnection.Sealing and insulation connection wherein between pole and flip piece can pass through their this body structure It realizes, can also be realized by increasing the modes such as dead ring, sealing element.In this manner it is possible to rationally and make full use of battery Existing structure so that while improving as far as possible less existing battery structure, realization disconnects in time at over-charging of battery initial stage The purpose of electric current.
Specifically, in the present embodiment, the first polarity part 101 (electrode inner terminal or pole), the second polarity part 102, flip piece 105 and conduct piece 106 are used to surround the seal chamber 103.As shown in Figure 1, in order to avoid cover board 104 charges, Pole needs to insulate with cover board while being fixedly connected with cover board.Specifically, the inner end of cover board 104 and pole has radial The outer end face of flange 107, the radial flange 107 is sealedly connected with interior insulation ring 108, and cover board 104 is sealably coupled to the interior insulation To insulate with pole on the outer end face of ring 108.I.e. the interior insulation ring 108 is located at the downside of cover board in Fig. 1.
Dead ring therein can be made of ceramics or plastic cement.When the dead ring is made of ceramics, above-mentioned radial flange It can be attached by Ceramic brazing between 107 and interior insulation ring 108, interior insulation ring 108 and cover board.In this way, compared to modeling The insulation of the realizations such as material, rubber, reliability and durability are stronger, and the robust seal that current interruptions structure not only may be implemented connects It connects, additionally it is possible to realize the insulation of the two.When dead ring is made of plastic cement, which can be integrally formed at injection molding process On pole, to reduce assembly time.
For convenience of by can be in the toroidal cavity that has surrounded of aerogenesis medium injection, in the first embodiment of the disclosure In, as shown in Figure 1, being formed with the medium injection hole 109 for being connected to toroidal cavity on radial flange 107.It can be in pole Inner end can aerogenesis medium to filling inside seal chamber 103.When assembly, first by the first polarity part 101, the second polarity part 102, Interior insulation ring 111, external insulation ring 112, conduct piece 106 and flip piece 105 fit on cover board, empty to surround closed annular Chamber.Then by the medium injection hole 109 by can aerogenesis medium be injected into the toroidal cavity from the inner end of pole, then seal The medium injection hole 109 specifically can block the medium injection hole for example, by sealing-plugs such as aluminium pills, or for example, by The closeouts of pole are welded in the medium injection hole.Finally the cover board for being equipped with current interruptions structure is installed on battery again .In other embodiments, medium injection hole can also be designed in flip piece side, that is, be realized from the outer end of pole to close Seal chamber in injection can aerogenesis medium mode.Specifically it is described in detail in this second embodiment.
Further, as shown in Figure 1, to enhance the structural strength of the radial flange 107, to further increase pole and lid The outer end face of the stability connected between plate, radial flange 107 is formed as hierarchic structure, which has close to pole The outer ring of the axis of the inner ring of axis and separate pole, the thickness of inner ring are more than the thickness of outer ring, which refers to along pole Size on extending direction, interior insulation ring 108 are fixed on outer ring, and medium injection hole 109 prolongs from the inner face of radial flange 107 It reaches on inner ring.By design hierarchic structure, can increase can aerogenesis medium and pole lateral surface contact area, promoted aerogenesis In addition sensitivity can ensure the intensity of pole in the case where designing radial flange 107.
Wherein, under the premise of ensureing that radial flange 107 has sufficiently reliable structural strength, the interior insulation ring 108 is solid It is scheduled on the region of the thinner thickness of radial flange 107, to be conducive to surround the toroidal cavity of volume bigger so that more as possible Can aerogenesis media filler in the toroidal cavity, to improve the sensitivity of current interruptions structure.In addition, compared to medium injection hole 109 are formed in the region of the thinner thickness of the radial flange 107, and the thickness in the radial flange 107 is arranged in medium injection hole 109 On the thicker inner ring of degree, the depth of the medium injection hole 109 can be extended, when can aerogenesis medium be injected into seal chamber after be easier to Realize the sealing reliability of the medium injection hole 109.
As depicted in figs. 1 and 2, in the present embodiment, the second polarity part 102 is formed around the annular of toroidal cavity and leads Electric piece, the inner face of the annular conductive film are sealedly connected with the first external insulation ring 111, and cover board 104 is sealably coupled to this outside first To insulate with annular conductive film on the inner face of dead ring 111.Wherein, similar with above-mentioned interior insulation ring, first external insulation Ring 111 can also be made of ceramics or plastic cement, and by the processing work of 111 component adjacent thereto of the first external insulation ring being fixedly connected Skill is identical with interior insulation ring, i.e., Ceramic brazing may be used or injection molding realizes that therefore not to repeat here.Further, such as Shown in Fig. 2, for convenience of the component of the opposite polarities such as another pole of annular conductive film and battery as the second polarity part 102 Electrical connection, the ring shaped conductive on piece are additionally provided with the lug 1020 of protrusion, and specifically, which may be integrally formed in this Ring shaped conductive on piece.
Further, in order to realize the work of current interruptions structure, as shown in Figure 1, the outer end face sealing of annular conductive film Be connected with the second external insulation ring 112, the outer peripheral edge of flip piece 105 be sealably coupled on the outer end face of the second external insulation ring 112 with It insulate with annular conductive film.In this way, can not only realize the outer peripheral edge of flip piece 105 and its opposite polarity annular conductive film it Between insulation, prevent battery short circuit, and flip piece 105 can experience gas pressure, so as to using its outer peripheral edge as Supporting point is overturn and is disconnected being electrically connected between conduct piece 106, cuts off the electric current input or output of battery in time.It is similar The material of ground, the second external insulation ring 112 and above-mentioned first external insulation ring 111 can be identical, and shape can also be identical, and by The processing technology of two external insulation rings, 112 component adjacent thereto being fixedly connected is also identical as the first external insulation ring 11, does not make herein It repeats.
In the present embodiment, as shown in Figure 1, being sealedly connected with sealing ring on the outer end face of the second external insulation ring 112 110, the outer peripheral edge of flip piece 105 is sealedly connected on the sealing ring 110, i.e., flip piece 105 is connected to by sealing ring 110 On two external insulation rings 112, to ensure the sealing of seal chamber 103 so that seal chamber air pressure inside can act on flip piece Without gas leakage.In addition, conducting ring is could be provided as by sealing ring, to establish flip piece with extraneous by the sealing ring Current loop, i.e., sealing ring 110 can be used as electrode external terminal in present embodiment at this time.
Further, to realize that the sealing that flip piece is stablized is assembled while, protection can be played to current interruptions structure Effect, battery cover board assembly further includes the covering 113 being sealedly connected on the outer peripheral edge of flip piece 105 on the sealing ring 110. Wherein covering can be made of conductive materials such as metals, i.e., formed outside the electrode in present embodiment by the covering 113 Terminal specifically could be formed with the protrusion being connect with conducting transmissions parts such as electrode leading-out sheets on the outer end face of covering 113.Its In, electrode leading-out sheet can establish current path for example between adjacent single battery or between adjacent cell module.
In each embodiment of the disclosure, as shown in Figure 1, by taking the first embodiment as an example, it is above-mentioned in order to realize Gas leak is formed with the extraneous stomata 114 of connection on covering 113, so that the gas in seal chamber can be in flip piece It leaks after disconnecting electrical connection with conduct piece, prevents battery explosion.In addition, the stomata on covering is also possible that current interruptions knot Structure directly establishes pressure difference with air, to realize the action of flip piece.
Wherein, in order to realize being stably connected with for sealing ring and flip piece, covering 113 is formed as capping structure, sealing ring 110 outer end face is formed with L-type seam allowance, and inner face is for connecting the second external insulation ring 112.The outer peripheral edge of flip piece 105 is embedding Enter to be supported in the L-type seam allowance, and the outer peripheral edge is sealedly connected on the L-type by being provide with the capping structure of the flip piece 105 On seam allowance.It, can be with to current interruptions structure to which the covering 113 is while realizing the sealing assembly that flip piece 105 is stablized It plays a protective role.
Wherein, in the embodiment of the various design flip pieces of the disclosure and conduct piece, due in such as power battery pack Field in, need by electric current it is larger, it is therefore desirable to ensure that the welding structure of conduct piece 106 and flip piece 105 is stablized, keep away Exempt from high current fusing welding structure.In this way, in the present embodiment, as shown in Figure 1, flip piece 105 and one in conduct piece 106 Person is formed with boss, and another one is formed with the connecting hole 117 for accommodating the boss 116, between boss 116 and connecting hole 117 Pass through annular solder joint.I.e. for example, in the present embodiment, boss 116 can be formed on conduct piece 106, connecting hole 117 can be with It is formed on flip piece 105.Annular solder joint wherein herein refers to passing through the annular solder joint when connecting hole is set in outside boss The welding of whole and boss, therefore welding stability and leakproofness can be provided.In this way by close between boss and connecting hole Contact, on the one hand can ensure that annular solder joint can steadily will be received in 116 firm welding of boss in connecting hole 117, and And the circulation area that can increase electric current ensures passing through for high current.On the other hand, leakproofness between the two can be increased, i.e., In the case of the partial sidewall of conduct piece and flip piece collectively as seal chamber 103, the contact surface both increased can be passed through Product ensures leakproofness between the two, to be more easy to break conduct piece 106 from indentation 115.In some sides of other embodiment In formula, the modes such as laser fuU penetration welding can also be used to weld flip piece and conduct piece.
Wherein, it in each embodiment of the disclosure, as shown in Figure 1, by taking the first embodiment as an example, flip piece and leads Realize that the mode for disconnecting electrical connection can be realized by indentation between electric part.Intensity is processed in corresponding portion be less than other regions Weak point, wherein in order to complete being fully disconnected for conduct piece and flip piece, indentation is usually around conduct piece and flip piece Tie point, such as the welded loop configuration of above-mentioned boss.To be realized by the disconnection of conduct piece or flip piece itself The disconnection of electrical connection, wherein indentation can be formed on flip piece and can also be formed on conduct piece, in the present embodiment, lead Indentation 115 is formed on electric part 106, which surrounds the tie point for connecting flip piece 105 and be arranged, i.e., in conduct piece Annular indentation of the setting around boss 116 on 106.In this way, when the air pressure inside in seal chamber rises, the air pressure being subject to can To promote indentation 115 to be pulled off, so that conduction can be detached from flip piece 105 by being scored 106 part of conduct piece that 115 surround Part 106, to realize the disconnection of electric current.In other embodiments, indentation can also be formed on flip piece 105.
In the case of ensureing that conduct piece 106 and pole are fixed, indentation 115 thereon can also be pulled off, such as Fig. 1 institutes Show, receiving hole 118 is formed on the outer end end face of pole, and the outer peripheral edge of conduct piece 106 is fixed on the inner wall of the receiving hole 118 On.In this way, conduct piece 106 can carry out stablizing fixation by annular profile, and the region inside indentation 115 does not occur with pole It connects so as to be pulled off under external force, such as the pulling force of flip piece 105 or the direct pressure effect of air pressure.
Above describe battery cover board assemblies and single battery that the first embodiment according to the present invention provides, not It is detached under present inventive concept, feature in first embodiment is for example, boss welding structure, rotating sheet, dead ring etc. can be with In the disclosure is following or other possible embodiments, second of implementation of the disclosure is introduced with reference to Fig. 3 to Fig. 6 The battery cover board assembly that mode provides.
As shown in Figures 3 to 6, second of embodiment of the disclosure provides a kind of battery cover board assembly 200, electricity therein Stream interrupt structure have for fill can aerogenesis medium seal chamber 203, battery cover board assembly further includes respectively can aerogenesis with this In the first polarity part 201 and the second polarity part 202 that medium is in contact, the first polarity part 201 and the second polarity part 202 One is connected with anode, and another one is connected with battery cathode.When between the first polarity part 201 and the second polarity part 202 When voltage difference overrate, can aerogenesis medium can generate gas, to disconnect electrode inner end under the gas pressure of the gas Electrical connection between son and electrode external terminal.Wherein, in the present embodiment, the first polarity part 201 is by the electrode inner terminal shape Cheng Bingyu cover boards insulate, and the second polarity part 202 then formed by cover board, i.e., in present embodiment using cover board electrification by the way of. The mode of its cover plate electrification can be it with cover board be electrically connected with another electrode terminal without current interruptions structure and At.In such manner, it is possible to make full use of the existing component structural of battery, avoid using additional polarity part pair can aerogenesis medium apply Power up pressure difference.
In the present embodiment, similarly with first embodiment, current interruptions structure also has for as sealing The flip piece 205 of 203 partial sidewall of chamber, is electrically connected between electrode inner terminal and electrode external terminal by flip piece, and in gas Under the gas pressure of body, flip piece is acted to disconnect being electrically connected between electrode inner terminal and electrode external terminal.It specifically, can be with To disconnect flip piece and electrode inner terminal, i.e. electrical connection between the first polarity part 201.
Wherein, identical with first embodiment is to be fixed with conduct piece 206 on the outer end face of electrode inner terminal, turn over Turn part 205 to be connected electrically on conduct piece 206, the indentation that can be disconnected by the gas pressure of gas is formed on conduct piece 206 215, which surrounds the tie point for connecting flip piece 205 and is arranged, that is, breaks conduct piece 206 to realize flip piece 205 Electrical connection between electrode inner terminal.And boss further, is formed on one of flip piece and conduct piece, it is another It is formed with the connecting hole for accommodating the boss on person, is connected by annular solder joint between boss and connecting hole, it is logical to promote electric current Overstability and leakproofness.
In addition, in second of embodiment of the disclosure, electrode inner terminal by being formed along the pole that inward-outward direction extends, And seal and insulate and be connected on cover board, flip piece is coaxially disposed with pole and extends radially outwardly from pole, the side of pole Face and the sealing of the outer peripheral edge of flip piece and insulation connection, so that the annular that seal chamber is formed about the axis setting of pole is empty Chamber.I.e. in the present embodiment, similar with first embodiment, first the 201, second polarity part 202 of polarity part (pole), overturning Part 205 and conduct piece 206 are used to surround the seal chamber 203.As shown in Figure 3 and Figure 6, the side of pole and flip piece 205 Outer peripheral edge seals and insulation connection, so that seal chamber 203 is formed about the toroidal cavity of the axis setting of pole.With this side Formula rationally and can make full use of the existing structure of battery so that while improving as far as possible less existing battery structure, Realize the purpose in over-charging of battery initial stage timely turn-off current.
Wherein in order to realize to filling in the seal chamber 203 that has surrounded can aerogenesis medium, in present embodiment, boss 216 The end to end medium injection hole 209 for being communicated to seal chamber is offered to be noted from the outer end of pole into toroidal cavity with pole It can aerogenesis medium described in entering.Specifically, medium injection hole 209 includes axially extending along electrode inner terminal from boss 216 One section, and extend radially into pole side wall from the first segment to be communicated to the second segment of seal chamber 203, i.e. integral medium is noted Enter the L-type structure that hole 209 is formed as vertical, and the part with first segment on conduct piece, and is formed with first on pole Another part and second segment of section.
In addition, as shown in figure 3, in this second embodiment, receiving hole 218, conduct piece are formed on the outer end face of pole 206 outer peripheral edge is fixed on the inner wall of the receiving hole 218.In this way, conduct piece 206 can carry out stablizing admittedly by annular profile It is fixed, and connection does not occur with pole for region indentation 215 inside so as in external force, for example, the pulling force of flip piece 205 or It is pulled off under the direct pressure effect of air pressure.
For convenience of processing, medium injection hole 209 is generally formed into the L-shaped through-hole with vertical section and horizontal segment, in this way, Under the action of gravity, above-mentioned solvent can be rapidly flowing into seal chamber, to improve the efficiency of assembling of current interruptions structure.
Wherein, since the effect with the first embodiment cover plate is not exactly the same, in second of implementation of the disclosure In mode, cover board electrification is also used as being applied to electrode that can be on aerogenesis medium.Specifically, as shown in Figure 3 and Figure 6, Current interruptions structure is fixed on cover board, and cover board is as the second polarity part 202, and the periphery with pole and flip piece 205 respectively Edge seals and insulation connection.In this way, due to cover board can realize the encapsulation function of battery case and serve as with can aerogenesis medium The electrode being in contact to the amount of parts of the few current interruptions structure of letter, and reduces the assembly work of battery.
In the present embodiment, it is the amount of parts for further reducing current interruptions structure so that current interruptions knot The overall structure of structure is more compact, as shown in Figures 3 to 6, dead ring 208, flip piece is sealedly connected on the outer surface of cover board 205 outer peripheral edge and the side of pole are sealably coupled on the dead ring 208 to insulate respectively with cover board, and flip piece 205 Outer peripheral edge and pole insulated by dead ring 208.That is, the toroidal cavity is by cover board, pole, flip piece 205, dead ring 208 It surrounds jointly.Also, in second of embodiment that the disclosure provides, which passes through unique dead ring 208 can be realized as between the outer peripheral edge and pole of pole and cover board, the outer peripheral edge of cover board and flip piece, flip piece each other absolutely Edge and sealed connection significantly reduce the amount of parts of current interruptions structure, reduce the assembly work of battery, and improve electric current The integrally-built compactedness of interrupt structure.In addition the making material of dead ring 208 and it is fixedly connected with adjacent component Processing technology it is identical as the dead ring in the first embodiment, details are not described herein.
After disconnecting electrical connection in order to avoid conduct piece and flip piece, sealing ring is still electrically connected with pole, to lose electricity Interruption effect is flowed, as shown in Figure 3 and Figure 6, the outer end face of dead ring 208 is formed to have the hierarchic structure of inner ring and outer ring, pole The side of column is formed with the embedded L-type seam allowance being supported on the inner ring, to ensure that the dead ring 208 is stably fixed at pole On.The outer peripheral edge of flip piece 205 is sealably coupled on outer ring to insulate with pole, i.e. pole and sealing ring 210 passes through dead ring 208 insulation.In addition, sealing ring 210, which is sealedly connected on dead ring 208, can so that the outer peripheral edge of flip piece is sealed, from And the air pressure inside of seal chamber can act on flip piece without gas leakage.
Further, to ensure that dead ring 208 insulate with the outer peripheral edge of pole and flip piece respectively while, cover board may be used also With with can aerogenesis medium 207 be in contact, as shown in Figure 3 and Figure 4, be formed on dead ring 208 for being connected to toroidal cavity and lid The through-hole 2080 of plate, the i.e. part of cover board can be directly exposed in toroidal cavity.In this way, when can aerogenesis medium 207 be injected into After in the toroidal cavity, can aerogenesis medium 207 can be filled in the through-hole 2080, so as to directly be connect with cover board It touches so that cover board is as the first polarity part.
To make the structure of battery cover board assembly more compact, through-hole 2080 extends to interior from the inner face of dead ring 208 On circle.In other modes of texturing, which can also extend to from the inner face of dead ring on the outer ring.Further, it is Ensure can aerogenesis medium and cover board it is abundant between contact area sufficient enough, increase sensitivity, the through-hole 2080 is with edge Dead ring it is circumferentially spaced multiple.In addition, in order to balance connective stability and cover board with can aerogenesis medium it is enough Contact area, the through-hole 2080 are four be circumferentially arranged at equal intervals.In other embodiments, the number of through-hole can also be Other quantity, such as three or more.
In the present embodiment, in order to establish current flow path with the external world, as shown in figure 3, the outer end face of dead ring 208 It is sealedly connected with sealing ring 210, the outer peripheral edge of flip piece 205 is sealedly connected on the sealing ring 210, and the sealing of sealing ring 210 connects It is connected on outer ring to insulate with pole.I.e. flip piece 205 is connected to by sealing ring on dead ring 208, and pole and flip piece Outer peripheral edge be respectively fixed in the inner ring and outer ring of the both sides of the through-hole 2080.In this way, can guarantee pole and flip piece Outer peripheral edge between the reliability that insulate, and when sealing ring 210 is to be made of an electrically conducting material, sealing ring can by flip piece with The external world establishes current loop, that is, forms electrode external terminal.It can make in addition, sealing ring 210 is sealedly connected on dead ring 208 The outer peripheral edge of flip piece is sealed, so that seal chamber air pressure inside can act on flip piece without gas leakage.
Further, to realize that the sealing that flip piece is stablized turns to match while, protection can be played to current interruptions structure It acts on, covering 213 is also covered on flip piece 205, covering is electrically connected to form electrode external terminal with flip piece.In this way, Covering can be used as electrode external terminal, you can terminal boss is arranged by the connectors such as electrode leading-out sheet and the external world Current loop is established, such as can be drawn by electrode between adjacent single battery or between adjacent cell module Piece is connected.
In addition, the outer peripheral edge of covering can be sealedly connected on sealing ring 210, in order to realize above-mentioned air venting, Ensure the safe to use of battery, the extraneous stomata 214 of connection is formed on covering 213.In addition, the stomata on covering may be used also So that current interruptions structure directly establishes pressure difference with air, to realize the action of flip piece.
Wherein, in order to realize being stably connected with for sealing ring and flip piece, covering 213 is formed as capping structure, sealing ring 210 outer end face is formed with L-type seam allowance, and inner face is for connecting dead ring 208.The outer peripheral edge insertion support of flip piece 205 In the L-type seam allowance, and the outer peripheral edge is sealedly connected on by being provide with the capping structure of the flip piece 205 on the L-type seam allowance. To while realizing the sealing assembly that flip piece 205 is stablized, play a protective role to current interruptions structure.
As noted previously, as medium injection hole 209 is formed on conduct piece 206, therefore can carry out as follows Assembly：Cover board, pole and sealing ring 210 such as Ceramic brazing is passed sequentially through respectively first to be fixed on dead ring 208, you can This is constituted an independent assembly first, then conduct piece 206 is for example fixed to by Laser Welding on pole, Flip piece may be used the welding manners such as laser fuU penetration welding or above-mentioned boss welding structure with conduct piece and be connected, flip piece and close Seal ring can be connected by Laser Welding.Then can aerogenesis medium be injected into seal chamber by medium injection hole 209. After the completion of injection, the medium injection hole 209 is sealed by modes such as welding or sealing-plugs.Finally again by capping structure and flip piece It is connected for example, by Laser Welding, to complete the assembling and work of entire battery cover board assembly.
The battery cover board assembly that second of embodiment of the disclosure provides is described above, below in conjunction with Fig. 7 to figure The battery cover board assembly that 10 the third embodiment for introducing the disclosure provide.
As shown in Figure 7 to 10, battery cover board assembly 300 have for fill can aerogenesis medium 308 seal chamber 303, Wherein seal chamber 303 be constructed so that can aerogenesis medium 308 be electrically connected respectively with battery plus-negative plate, and battery plus-negative plate it Between voltage difference overrate when, can aerogenesis medium 308 can generate gas, under the gas pressure of the gas disconnect electricity Electrical connection between pole inner terminal and electrode external terminal is sealedly connected with interior insulation between the inner face and electrode inner terminal of cover board Ring 311 is sealedly connected with external insulation ring 312 between the outer end face and electrode external terminal of cover board, so that seal chamber 303 forms ring Around the toroidal cavity of the axis of electrode inner terminal.Realizing the feelings of electrode inner terminal and electrode external terminal respectively with cover board insulation Under condition, the seal chamber 303 in the disclosure is surrounded.
In the present embodiment, similarly with second embodiment, the battery cover board assembly include respectively can with this The the first polarity part 301 and the second polarity part 302 that aerogenesis medium is in contact, in the first polarity part 301 and the second polarity part 302 One with anode for being connected, and another one with battery cathode for being connected, and the first polarity part 301 is by electrode inner terminal shape At the second polarity part 302 is formed by cover board.I.e. cover board electrification and with can aerogenesis media contact.Wherein, optionally, cover board has The radially projecting annular slab in interior insulation ring 311 and external insulation ring 312.In this way, cover board can be made to pass through annular slab bigger Area in seal chamber 303 can aerogenesis media contact, to promote aerogenesis sensitivity.It can further be related on annular slab And the jog of surface roughness can be increased in following embodiments, to further increase aerogenesis sensitivity.It is specific concave-convex Portion is described in detail in following embodiments.
Wherein specifically, extend along inward-outward direction as the pole of electrode inner terminal, be formed with for pole on cover board The through-hole passed through, interior insulation ring 311 and external insulation ring 312 are arranged around through-hole.Furthermore it is possible to design the interior of interior insulation ring 311 The inner ring surface of anchor ring and external insulation ring 312 is axially aligned so that the annular plate of cover board with can aerogenesis medium contact Area bigger.
Wherein, similarly with first embodiment and second embodiment, current interruptions structure, which also has, is used as seal chamber The flip piece 305 of 303 partial sidewalls, is electrically connected between electrode inner terminal and electrode external terminal by flip piece 305, and in gas Under the gas pressure of body, flip piece is acted to disconnect being electrically connected between electrode inner terminal and electrode external terminal.Electrode inner terminal Outer end face on be fixed with conduct piece 306, flip piece 305 is connected electrically on conduct piece 306, and is formed on conduct piece 306 The indentation 315 that can be disconnected under the gas pressure of gas, the indentation 315 are surrounded and are set for connecting the tie point of flip piece 305 It sets.It is formed with boss 316 on one of flip piece 305 and conduct piece 306, is formed in another one and accommodates the boss 316 Connecting hole 317 is connected between boss 316 and connecting hole 317 by annular solder joint.So as to be experienced in time from seal chamber Air pressure, and disconnect the electrical connection of electrode inner terminal and electrode external terminal.
In the third embodiment of the disclosure, similarly with the first and second embodiments, flip piece 305 and pole It is coaxially disposed and extends radially outwardly from pole, in the side sealing and insulation to interior insulation ring 311 of pole, flip piece 305 Outer peripheral edge be fixed between electrode external terminal and external insulation ring 312, and be sealably coupled on external insulation ring 312, with cover board It insulate and forms toroidal cavity.That is, first the 301, second polarity part 302 of polarity part (pole), flip piece 305 and conduct piece 306 It is used to surround the seal chamber 303.As shown in fig. 7, specifically, the side of pole and the outer peripheral edge sealing of flip piece 305 and absolutely Edge connects, so that seal chamber 303 is formed about the toroidal cavity of the axis setting of pole.In this manner it is possible to rationally and Make full use of the existing structure of battery so that while improving as far as possible less existing battery structure, realize in battery mistake Fill the purpose of initial stage timely turn-off current.
As shown in Figure 3 and Figure 5, similarly with second embodiment cover plate, in the third embodiment party of the disclosure In formula, which is also used as being applied to electrode that can be on aerogenesis medium, i.e. cover board charges.Specifically, such as Fig. 7 and Figure 10 institutes Show, current interruptions structure be fixed to battery cover board on, cover board as the second polarity part 302, and respectively with pole and flip piece 305 outer peripheral edge sealing and insulation connection.In this way, due to cover board can realize the encapsulation function of battery case and serve as with can The electrode that aerogenesis medium is in contact to the amount of parts of the few battery cover board assembly of letter, and reduces the assembly work of battery.
Further, to realize that pole insulate while being bonded with cover board with cover board, specifically, as shown in fig. 7, There is the inner end of pole radial flange 307, the outer end face of the radial flange 307 to be sealedly connected with interior insulation ring 311, and cover board is close Envelope is connected on the outer end face of the interior insulation ring 311 to insulate with pole.I.e. the interior insulation ring 311 is located at cover board in the figure 7 Inside.In addition interior insulation ring 311 herein and it is following in external insulation ring 312 making material and itself and adjacent component are consolidated Surely the processing technology connected is identical as the dead ring in the first embodiment, and details are not described herein.
For convenience of this can aerogenesis medium 308 inject the toroidal cavity in, as shown in fig. 7, medium injection hole 309 is formed in diameter To on flange 307, with from the inner end of pole to can aerogenesis medium with injection in the toroidal cavity that surrounds.
In the present embodiment, in order to realize the work of current interruptions structure, as shown in fig. 7, outside due to flip piece 305 Be sealedly connected with external insulation ring 312 on periphery, cover plate for sealing be connected on the inner face of the external insulation ring 312 with flip piece 305 outer peripheral edge insulation.In this way, can not only realize exhausted between the outer peripheral edge of flip piece 305 and its opposite polarity cover board Edge prevents battery short circuit, and flip piece 305 can experience gas pressure, so as to using its outer peripheral edge as supporting point It is overturn and is disconnected being electrically connected between conduct piece 306, cut off the electric current input or output of battery in time.
In order to further improve this can aerogenesis medium aerogenesis sensitivity, in an illustrative embodiments of the disclosure In, using the third above-mentioned technical solution.I.e. as illustrated in fig. 7 and fig. 10, the inner ring surface of interior insulation ring 311 and external insulation ring 312 Inner ring surface it is axially aligned so that cover board have the radially projecting annular in interior insulation ring 311 and external insulation ring 312 Plate.In this way, the through-hole of cover board hole wall and annular slab both ends of the surface can with can aerogenesis medium be in contact, to promoted should Can aerogenesis medium 308 aerogenesis sensitivity.
In the present embodiment, as shown in fig. 7, the outer end face of external insulation ring 312 is sealedly connected with sealing ring 310, overturning The outer peripheral edge of part 305 is sealedly connected on the sealing ring 310, i.e., flip piece 305 is connected to external insulation ring by sealing ring 310 On 312, in this way, by when sealing ring is conductive material, flip piece and the external world can be established current loop, that is, be formed as electricity Extreme outer.In addition, sealing ring 310, which is sealedly connected on external insulation ring 312, can so that the outer peripheral edge of flip piece is sealed, So that seal chamber air pressure inside can act on flip piece without gas leakage.
Further, to realize that the sealing that flip piece is stablized turns to match while, protection can be played to current interruptions structure It acts on, covering 313 is also covered on flip piece 305.Covering 313 is electrically connected to form electrode external terminal with flip piece 305. To establish current loop by electrode leading-out sheet and the external world, such as between adjacent single battery or adjacent cell mould It can be connected by electrode leading-out sheet between group.
In addition, the outer peripheral edge of covering is sealed with flip piece, ensure the leakproofness of seal chamber.In order to realize above-mentioned gas It leaks, the extraneous stomata 314 of connection is formed on covering 313.In this way, the gas in seal chamber can be in flip piece and conduction Part leaks after disconnecting electrical connection, prevents battery explosion.In addition, the stomata on covering be also possible that current interruptions structure with it is big Gas directly establishes pressure difference, to realize the action of flip piece.
Wherein, in order to realize being stably connected with for sealing ring and flip piece, covering 313 is formed as capping structure, sealing ring 310 outer end face is formed with L-type seam allowance, and inner face is for connecting external insulation ring 312.The outer peripheral edge insertion branch of flip piece 305 Support is in the L-type seam allowance, and the outer peripheral edge is sealedly connected on the L-type seam allowance by being provide with the capping structure of the flip piece 305 On.To which the covering 313 is while realizing the sealing assembly that flip piece 305 is stablized, current interruptions structure can be played Protective effect.
In addition, as shown in fig. 7, being formed with receiving hole 318 on the outer end end face of pole, the outer peripheral edge of conduct piece 306 is fixed On the inner wall of the receiving hole 318.In this way, conduct piece 306 can carry out stablizing fixation by annular profile, and in indentation 315 Connection does not occur with pole for the region in portion so as in external force, such as the pulling force of flip piece 305 or the direct pressure of air pressure It is pulled off under effect.
As above, medium injection hole 309 is formed on the radial flange 307 on pole, thus can install as under type into Luggage is matched：Pole upper end is passed through into cover board first, and pole, interior insulation ring 311 are fixed to cover board for example, by Ceramic brazing On, then sealing ring, external insulation ring 312 are fixed on the cover board, then for example by conduct piece 306 for example, by Ceramic brazing It is fixed on pole by Laser Welding, laser fuU penetration welding or above-mentioned boss welding structure etc. may be used in flip piece and conduct piece Welding manner is connected, and flip piece can be connected with sealing ring by Laser Welding.Then both can aerogenesis medium noted by medium Enter hole 309 to be injected into seal chamber.After the completion of injection, the medium injection hole 309 is sealed by modes such as welding or sealing-plugs.Most Covering plate structure is connected with flip piece for example, by Laser Welding again afterwards, to complete assembling and the work of entire battery cover board assembly Make.
The battery cover board assembly that the third embodiment of the disclosure provides is described above, below in conjunction with Figure 11 and figure The battery cover board assembly that 12 the 4th kind of embodiments for introducing the disclosure provide.
As is illustrated by figs. 11 and 12, the battery cover board assembly 400 have for fill can aerogenesis medium seal chamber 403, Seal chamber 403 be constructed so that can aerogenesis medium be electrically connected respectively with battery plus-negative plate, and the voltage between battery plus-negative plate When poor overrate, can aerogenesis medium can generate gas, under the gas pressure of the gas disconnect electrode inner terminal and Electrical connection between electrode external terminal, wherein the bumps for increasing surface roughness are formed on the madial wall of the seal chamber 403 Portion 408.In this way, by jog 408 increase seal chamber inside roughness, can effectively be promoted with increase can aerogenesis medium with Contact area between its electrode improves aerogenesis sensitivity.
Specifically, in the 4th kind of embodiment of the disclosure, which can be accomplished in several ways, example Such as, jog 408 can be formed by dentation continuous structure and/or the microcellular structure being spaced apart.Dentation continuous structure therein Concrete shape can be formed as at least one of semicircular structure, rectangular configuration by way of mechanical processing, and be in tooth Shape structural arrangement.Or the other micropore that can also be realized by way of chemical attack of the jog 408, such as pass through to Seal chamber Nell wall needs to be exposed to such as the first polarity part and the second polarity part to be sprayed on the surface of seal chamber 403 with corruption The chemical solvent of corrosion, it is anti-to which chemistry occur between the first polarity part and the second polarity part respectively by the chemical solvent It answers so that the first polarity part 401 and second polarity part 402 etc. have microcellular structure on the surface of components.The disclosure is to jog Realization does not limit.
In addition, the jog 408 can be formed only at being exposed on the surface of seal chamber 403 of the first polarity part 401, Being exposed on the surface of seal chamber 403 for the second polarity part 402 can also be formed only at.To improve aerogenesis sensitivity, preferably Ground, the jog 408 are formed simultaneously in the surface for being exposed to seal chamber 403 of the first polarity part 401 and the second polarity part 402 On.
At least partly similarly with the first, second, third embodiment, in the fourth embodiment, battery cover board group Part include respectively with can aerogenesis medium be in contact and constitute the first polarity part 401 and second of at least partly side wall of seal chamber 4023 Polarity part 402, one of the first polarity part 401 and the second polarity part 402 for being connected with anode, another one for Battery cathode is connected, and jog 408 is formed in the surface of the first polarity part 401 and/or the surface of the second polarity part 402 On.
Optionally, electrode inner terminal is along the pole that inward-outward direction extends by forming, pole as the first polarity part 401 and with Cover plate for sealing and insulation connection.In addition, current interruptions structure also has the flip piece 405 as seal chamber 403, pole and electrode It is electrically connected by flip piece between external terminal, and under the gas pressure of gas, flip piece is acted to disconnect pole and electrode Electrical connection between external terminal.Further, flip piece 405 is coaxially disposed with pole and extends radially outwardly from pole, overturns The outer peripheral edge of part 305 and the side sealing and insulation of pole connect, so that the axis that seal chamber 303 is formed about pole is set The toroidal cavity set.
Optionally, conduct piece 406 is fixed on the outer end face of pole, flip piece 405 is connected electrically on conduct piece 406, and And the indentation 415 that can be disconnected by the gas pressure of gas is formed on conduct piece 406, which surrounds turns over for connecting Turn the tie point setting of part 105.It is formed with boss 416 on one of flip piece 405 and conduct piece 406, is formed in another one There is the connecting hole 417 for accommodating the boss 416, is connected by annular solder joint between boss 416 and connecting hole 417.Second polarity part 402 are formed by cover board, and the outer peripheral edge sealing and insulation of flip piece 405 are connected on cover board.
In addition, the inner end of pole has a radial flange 407, the outer end face of the radial flange 407 be sealedly connected with it is interior absolutely Edge ring 411, cover plate for sealing are connected on the interior insulation ring 411 to insulate with pole.Further, the side of pole has vertical In being covered with jog 408 in the barrel surface of radial flange 407, the barrel surface.
Wherein, it is formed on radial flange 407 for being connected to the medium injection hole 409 of toroidal cavity with from the inner end of pole Into toroidal cavity, injection can aerogenesis medium.In addition, being sealedly connected with external insulation ring 412, cover board on the outer peripheral edge of flip piece 405 It is sealably coupled on the external insulation ring 412 to insulate with the outer peripheral edge of flip piece 405.It is formed on cover board and leads to for what pole passed through Hole, interior insulation ring 411 and/or external insulation ring 412 are arranged around through-hole.Further, the inner ring surface of interior insulation ring 411 and it is outer absolutely The inner ring surface of edge ring 412 is axially aligned, so that cover board is with radially projecting in interior insulation ring 411 and external insulation ring 412 Annular slab 404, being exposed on the surface of toroidal cavity for the annular slab 404 be covered with above-mentioned jog 408.
The outer end face of external insulation ring 412 is sealedly connected with sealing ring 410, and the outer peripheral edge of flip piece 405 is sealedly connected on close In seal ring 410, flip piece 405 is also covered with covering 413, and covering 413 is electrically connected to form electrode outer end with flip piece 405 Son.In addition, being formed with the extraneous stomata 414 of connection on covering 413.
Wherein, in order to realize being stably connected with for sealing ring and flip piece, covering 413 is formed as capping structure, sealing ring 410 outer end face is formed with L-type seam allowance, and inner face is for connecting external insulation ring 412.The outer peripheral edge insertion branch of flip piece 405 Support is in the L-type seam allowance, and the outer peripheral edge is sealedly connected on the L-type seam allowance by being provide with the capping structure of the flip piece 413 On.To which the covering 413 is while realizing the sealing assembly that flip piece 405 is stablized, current interruptions structure can be played Protective effect.
In addition, in the case of in order to ensure that conduct piece 406 and pole are fixed, indentation 415 thereon can also be pulled off, such as Shown in Figure 11 and Figure 12, receiving hole 417 is formed on the outer end end face of pole, the outer peripheral edge of conduct piece 406 is fixed on the receiving On the inner wall in hole 417.In this way, conduct piece 406 can carry out stablizing by annular profile fixation, and the region inside indentation 415 Do not occur to connect so as in external force, such as the pulling force of flip piece 405 or the lower quilt of the direct pressure effect of air pressure with pole It breaks.
The structure and assembling mode of battery cover board assembly in present embodiment and above-mentioned first, second and the third reality The effect for applying the identical part of mode is similar with mode of texturing, does not do and excessively repeats.
The battery cover board assembly that the 4th kind of embodiment of the disclosure provides is described above, is not departing from present inventive concept Under, the feature such as jog in the 4th kind of embodiment can be applied in other each embodiments, below in conjunction with Figure 13 The battery cover board assembly 500 that two kinds of embodiments of the 5th kind of embodiment kind of the disclosure provide is introduced with Figure 14.Other are in order to retouch It states succinctly, the feature different with first four embodiment, the effect of same characteristic features and change is only described in detail to the 5th embodiment Shape mode, which is not done, excessively to be repeated.
As shown in Figure 13 and Figure 14, the battery cover board assembly 500 have for fill can aerogenesis medium seal chamber 503, Wherein, electrode inner terminal constitute seal chamber 503 partial sidewall, seal chamber 503 be constructed so that can aerogenesis medium respectively with electricity Pond positive and negative anodes electrical connection, and when voltage difference overrate between battery plus-negative plate, can aerogenesis medium can generate gas Body, under the gas pressure of the gas electrode inner terminal action to disconnect being electrically connected between electrode inner terminal and electrode external terminal It connects.
I.e. in the 5th embodiment, electrode inner terminal is disconnected using flip piece action with four kinds of embodiments before Unlike the mode of electrode external terminal, in two kinds of embodiments in the 5th embodiment, it is dynamic to be all made of electrode inner terminal Make to disconnect the electrical connection between electrode external terminal.Wherein, optionally, in two kinds of embodiments, design is so that electrode outer end Son 506 constitutes the partial sidewall of seal chamber, and is formed with the connection external world and seal chamber medium injection hole 509.Electrode external terminal and Side wall of the electrode inner terminal as seal chamber 503.The presence of wherein medium injection hole 509 solve can aerogenesis medium from outer end The problem of injection.
Two of which embodiment is identical to be, battery cover board assembly include respectively with can the first pole for being in contact of aerogenesis medium Property part 501 and the second polarity part 502, one of the first polarity part 501 and the second polarity part 502 are used for and anode phase Even, another one with battery cathode for being connected, and the first polarity part 501 is formed by electrode inner terminal, outside electrode inner terminal and electrode It is electrically connected, is sealed between the periphery and the periphery of electrode external terminal 506 of electrode inner terminal and exhausted by conductive structure between terminal Edge connects, so that seal chamber 503 is formed around the toroidal cavity of conductive structure setting.Producing in this way in toroidal cavity When gas medium accumulation and air pressure raising, electrode inner terminal is enabled to act and implement in electrode by breaking conductive structure The disconnection of electrical connection between terminal and electrode external terminal.
In order to be pulled off convenient for electrode inner terminal, electrode inner terminal is formed as laminated structure and includes sealing and insulate Ground is connected to the terminal outer ring 504 of electrode external terminal, and as the terminal inner ring 517 of 503 partial sidewall of seal chamber, outside terminal Circle 504 is arranged for being electrically connected with battery core for example, by connectors such as interior lead-out tablets between terminal inner ring 517 and electrode external terminal It conductive structure and can be deformed under gas pressure to break conductive structure.Due to forming laminated structure, inside is being received Under gas pressure, terminal inner ring 517 can deform to break conductive structure.Wherein in order to further ensure the change of terminal inner ring Shape, the thickness of terminal inner ring are less than the thickness of terminal outer ring.On the one hand terminal outer ring can be facilitated to be connected with other elements strong Degree.On the other hand, it is ensured that the deformation of terminal inner ring and be pulled off, i.e., disconnect electrode inner terminal and electrode external terminal also from After oneself electrical connection, terminal inner ring itself can be made to be pulled off, so that the gas leak in seal chamber is to inside battery, And can be released for example, by the explosion-proof valve of installation on the cover board, so as to prevent battery explosion.
I.e. in the present embodiment, due to the flip piece in the embodiment without before, in order to ensure the sealing of seal chamber, It cannot be formed with stomata on electrode external terminal, therefore terminal inner ring can be designed itself and be pulled off and release gas, and at this In embodiment, battery cover board assembly 500 further includes the explosion-proof valve of installation on the cover board.Wherein explosion-proof valve is known in the art Component is the component for preventing inside battery air pressure excessive and exploding, and has setting Opening pressure, when the pressure of inside battery is big When the setting Opening pressure, then explosion-proof valve unlatching releases stress, to ensure the safety of battery.
As shown in figure 13, in the first embodiment, conductive structure include be connected to terminal inner ring and electrode external terminal 506 it Between terminal conductive sheet 516, and the stretch breaking strength of terminal conductive sheet is less than the stretch breaking strength of terminal inner ring, and annular seal space encloses It is arranged around terminal conductive sheet, it, can be in internal gas since the stretch breaking strength of terminal conductive sheet is less than the stretch breaking strength of terminal inner ring Under the action of pressure, drive terminal inner ring deforms first, terminal conductive sheet is then broken, to disconnect outside electrode inner terminal and electrode Electrical connection between terminal.As pressure continues to increase, terminal inner ring itself will be pulled off, so that outside the gas of seal chamber Let out guarantee safety.
As shown in figure 13, wherein the structure of terminal conductive sheet can be formed as Z-type piece, the Z-type piece be mutually parallel first Section and second segment are welded on electrode inner terminal and electrode external terminal, in addition it can increase L-type piece, the L-type piece point Do not constitute T-type structure with the first segment of Z-type piece and second segment prevents the end of terminal conductive sheet to reinforce the intensity of pad Portion's wrong diagnosis is opened, and battery can not be worked.
As shown in figure 14, in the second embodiment of present embodiment, electrode external terminal 506 is formed as capping structure, electricity There is the inner face of extreme outer 506 the terminal boss 518 for stretching into seal chamber, the inner face of the terminal boss 518 to pass through to be formed It is fixed on terminal inner ring for the solder joint 508 of conductive structure.I.e. both the present embodiment conductive structure is only solder joint 508, is existed in this way Under gas pressure, electrical connection between electrode inner terminal and electrode external terminal can be disconnected by pulling open the solder joint 508.
Specifically, as shown in figure 14, electrode external terminal 506 is formed as capping structure, and the inner face of the covering plate structure has Stretch into the terminal boss 518 of seal chamber, the inner face of the terminal boss 518 is by being formed as the solder joint 508 of the conductive structure Fixed on terminal inner ring.In this way, when battery be in overcharge initial stage when, can aerogenesis dielectric breakdown generate gas air pressure make Under, the solder joint between terminal inner ring and terminal boss 518 is broken, the electric current to interrupt battery transmits.And the sealing Air pressure in chamber 503 persistently increases, until breaking terminal inner ring.Seal chamber is opened, which enters inside battery, and for example logical It crosses explosion-proof valve to release, so as to prevent battery explosion.In addition unlike the 5th kind of embodiment, in present embodiment In, without additional setting terminal conduct piece 516, to reduce amount of parts, and reduce the assembler of current interruptions structure When.
Wherein, which can be soldered on conduct piece 506, to reduce assembly work, and avoid making in air pressure With the connection between lower disconnection electrode external terminal and terminal boss, which may be integrally formed in the conduct piece 506 On.Specifically, to make full use of existing component structural, electrode external terminal 506 is including capping structure and is integrally formed at lid Terminal boss 518 on the inner face of cap structure.
Further, it is connected with the terminal boss 518 for convenience of terminal inner ring, as shown in figure 14, terminal inner ring is formed as The bowl structure 507 protruded towards terminal boss 518.Specifically, the bottom of bowl outer end face Yu terminal boss of the bowl structure 507 It is adjacent by solder joint 508 on 518 inner face.More specifically, bottom of bowl outer end face is formed as bottom of bowl planomural 507a, bowl structure is also Include the conical ring structure 507b to extend internally from the periphery of bottom of bowl planomural 507a, and is formed in the interior of conical ring structure 507b The radial flange 507c of end face, and radial flange is connected with terminal outer ring.The inflection portions of bowl structure therein can be with As breaking a little for terminal inner ring.Decrease processing, such as processing indentation etc. can be carried out to it.
Further, as shown in figure 14, solder joint 508 is formed as loop configuration, and the loop configuration is located at bottom of bowl planomural On the inside of the periphery of 507a.Since the periphery of loop configuration is bigger, more it is easily guaranteed that the welding of terminal boss and terminal inner ring is stablized Property prevents instantaneous large-current from fusing the welding structure.On the other hand, when loop configuration is bigger, under the influence of air pressure, the annular Structure is less susceptible to break, and influences the sensitivity of the current interruptions structure.Based on this, put down by the way that loop configuration is set to bottom of bowl The inside of wall 507a, the i.e. outer peripheral edge of bottom of bowl planomural 507a can take into account the spirit of current interruptions structure around the loop configuration Sensitivity and welding stability.
In the 5th kind of embodiment of the disclosure, the cover board is as the second polarity part 502, i.e., cover board electrification is using as applying It is added to electrode that can be on aerogenesis medium.Specifically, as shown in Figure 13 and Figure 14, it and seals and insulated is connected to electrode inner terminal Periphery and the periphery of the electrode external terminal 506 between.In this way, since cover board can realize the encapsulation function of battery case simultaneously And serve as with can the electrode that is in contact of aerogenesis medium, to the amount of parts of the few current interruptions structure of letter, and reduce battery Assembly work.
Specifically, to realize that cover board is connected with the sealing of the inside and outside terminal of electrode and insulation simultaneously, as shown in figure 14, electrode It is sealedly connected with interior insulation ring 511 between inner terminal and cover board, external insulation ring is sealedly connected between electric part external terminal and cover board 512, and interior insulation ring 511 and the setting of the interval of external insulation ring 512, so that cover board is exposed to the seal chamber, to conduct Second polarity part.
The battery cover board assembly 500 of the 5th kind of embodiment of the disclosure is described above, below in conjunction with Figure 15 to figure The battery cover board assembly 600 that 20 the 6th kind of embodiments for introducing the disclosure provide.
As shown in Figure 15 to Figure 20, battery cover board assembly 600 includes cover board, electrode inner terminal and electrode external terminal, electrode By installing current interruptions structure electrical connection on the cover board between inner terminal and electrode external terminal, battery cover board assembly further includes For fill can aerogenesis medium 604 and mounted on the seal chamber 603 in the outside of cover board 612, seal chamber 603 is constructed so as to produce Gas medium is electrically connected with battery plus-negative plate respectively, and when voltage difference overrate between battery plus-negative plate, can aerogenesis Medium 604 can generate gas, to break through seal chamber 603 under the gas pressure of the gas so that gas enters in battery Portion is simultaneously passed to current interruptions structure to disconnect the electrical connection between electrode inner terminal and electrode external terminal by gas pressure.With Other various embodiments of the disclosure are very different, and seal chamber 603 is formed in the outside of battery.In this way, since this is close Envelope chamber 603 is not located inside battery, therefore can avoid occupying the space of inside battery, is such as battery core of inside battery Parts provide adequately lay space, to conducive to improve battery energy density.In addition, since seal chamber 603 is arranged In the outside of battery, also allow for from the outside of battery by can aerogenesis medium be injected into the seal chamber 603 surrounded.In addition, Unlike above-mentioned five kinds of embodiments, in the 6th kind of embodiment and the following the 7th kind of embodiment, the electric current Disconnected structure and the cavity for surrounding the seal chamber 603 are independent from each other two structures, and the current interruptions structure may be used Current interrupt device in the prior art.
Wherein, battery cover board assembly include respectively with can the first polarity part 601 for being in contact of aerogenesis medium and the second pole Property part 602, one of the first polarity part 601 and the second polarity part 602 for be electrically connected with anode, another one for Battery cathode is electrically connected.Unlike other various embodiments of the disclosure, the sealing of the first polarity part 601 and connection of insulating Onto the second polarity part 602, to be integrally formed into the hood-like structure being open towards inside battery, the opening in cover body structure is also close Envelope is connected with pressure release part 605 to surround seal chamber, and pressure release part 605 can rupture under gas pressure to allow gas flow battery Inside.That is, the hood-like structure be applied not only to for can aerogenesis medium establish two opposite polarity electrodes of voltage difference, but also Provide space it is larger can fill it is enough can aerogenesis medium seal chamber, while also increasing can aerogenesis medium difference With the contact area between the first polarity part 601 and the second polarity part 602, aerogenesis sensitivity is improved.
Therefore, when battery is when overcharging initial stage, can aerogenesis medium 604 in the first polarity part 601 and the second polarity part 602 Voltage difference effect is lower to decompose and generates air pressure of the gas then in seal chamber 603 and increase, should at this time under certain gas pressure 605 pressure release of pressure release part, gas enter inside battery and are connected with the current interruptions structure.The air pressure of inside battery persistently rises Height, until disconnecting the electrical connection between conduct piece 615 and flip piece 614, the electric current to interrupt battery transmits.
Wherein, as shown in figure 15, pressure release part 605 can be realized in several ways, such as the pressure release part 605 can be Including the sealing plate being sealedly attached in the hood-like structure, and the relief valve that is sealedly connected on the pressure relief plate.When above-mentioned gas When the air pressure that body generates is greater than or equal to the Opening pressure of the relief valve, the relief valve is in the conduction state.And work as above-mentioned gas When the air pressure of generation is less than the Opening pressure of the relief valve, which closes.
In the another embodiment of pressure release part 605, to improve the response sensitivity of current interruptions structure, such as Figure 16 and Shown in Figure 20, the first indentation 606 is formed on pressure release part 605, first indentation 606 can be disconnected under gas pressure so that Gas is released via pressure release part 605.I.e. by processing the weakness that intensity is less than other regions in the corresponding portion of pressure release part 605 Portion, when the air pressure inside in seal chamber 603 rises, the air pressure being subject to can promote first indentation 606 to be pulled off, to So that gas is flowed into inside battery by the gap torn on pressure release part, with the lasting increase of air pressure by the battery The transmission of disconnected structure turn-off current.
To further improve the sensitivity of current interruptions structure, as shown in Figure 16 and Figure 20, pressure release part 605 is formed as having There is the pressure relief plate of the first indentation 606, be formed on the pressure relief plate and weaken deep gouge 607, the first indentation 606 is located at the decrease deep gouge In 607 groove bottom wall.In this way, being weakened in deep gouge 607 by the way that the first indentation 606 to be laid in, due to weakening the knot at deep gouge 607 Structure intensity is lower than other regions, to further reduce the overall construction intensity at the first indentation 606, and then promotes electric current The sensitivity of interrupt structure.
Further, to simplify the parts of current interruptions structure, and the sensitivity of current interruptions structure is improved, this is let out Casting die 605 is conduct piece, so as to enhance this can aerogenesis medium and its electrode contact area, raising current interruptions structure Sensitivity.
After preventing air pressure from thrusting the first indentation 606, the part that is pulled on the pressure release part falls to inside battery and causes electricity Short circuit occurs for pond, and as shown in figure 20, the first indentation 606 is formed as both ends non-rectilinear linear structure spaced apart.That is, first quarter Trace 606 is formed as non-occluded configuration, accordingly even when the first indentation 606 is pulled off, still can by the part that the first indentation 606 surrounds It depends on the pressure release part 605, inside battery short circuit is caused to prevent the due to of thrusting piece because falling, improve electricity The safety in pond.
Wherein, which can be formed as curvilinear structures, it is preferable that be the spirit for taking into account current interruptions structure The safety of sensitivity and battery, the linear structure are formed as major arc structure.In the mode of other deformations, first indentation 606 It can be formed as y-type structure or bending cable architecture.
Further, to be installed on cover board with making the hood-like stable structure, and facilitating simultaneously can aerogenesis medium and electricity The positive and negative anodes in pond are connected, and as shown in Figure 18 and Figure 19, the second polarity part 602 is fixed on cover board to pass through cover board and anode Or battery cathode electrical connection.
Further, to extend the service life of cover board, installation is formed with as shown in Figure 15, Figure 18 and Figure 19, on cover board Hole, the second polarity part 602 is installed on the inner wall of the mounting hole so that the opening of hood-like structure is towards inside battery.In this way, The pressure release part that can more renew on the second polarity part 602 again after the pressure release part breakage, and without destroying the structure of cover board, Improve the service life of cover board.Certainly in other modes of texturing, which can also be used as the second polarity part, and by this One polarity part is integrally formed into hood-like structure, and is sealed on cover board to form above-mentioned seal chamber.
It is electrically connected with battery foundation for convenience of the first polarity part, the first polarity part passes through conductive connecting piece 625 and exposing The electrode terminal of cover board is electrically connected.Further, to avoid increasing the whole height of single battery, by by the hood-like structure Outer end face is designed as that the outer end face of the pole is substantially flush or be slightly below with the outer end face for the electrode terminal for exposing cover board, and will The pole and the hood-like structure are arranged along the extending direction interval of battery cover board, so as to not increase the whole high of the battery Under the premise of degree, increase the inner space of the seal chamber 603, so as to improve can aerogenesis medium 604 loading, improve aerogenesis Sensitivity.
In the present embodiment, the first polarity part 601 and the second polarity part 602 can surround to realize in several ways Hood-like structure, the first polarity part 601 and the second polarity part 602 can be realized in such a way that left and right is docked.For convenience of close The butt end of the first polarity part 601 and the second polarity part 602 is sealed, as shown in figure 15, the first polarity part 601 and the second polarity part 602 can form the hood-like structure by mode stacked on top of one another.
Specifically, it is in H to have longitudinal section as shown in Figure 15 and Figure 18, between the first polarity part 601 and the second polarity part 602 For the annular insulation strip 608 of type structure so that the first polarity part 601 and the second polarity part 602 insulate, hood-like structure includes conduct The cover body structure of first polarity part 601, and as the cover edge structure of the second polarity part 602, the cover body structure and cover edge structure The edge being close is respectively embedded into and is sealed in the U-type groove of the opposite end of the H-type structure, the outer peripheral edge of cover edge structure and lid Plate is fixedly linked.It, can be in this way, by the way that the first polarity part 601 and the second polarity part 602 are respectively embedded into the U-type groove respectively Ensure the reliability of the insulation and sealing between the first polarity part 601 and the second polarity part 602 simultaneously.
Wherein, which can be assembled between the first polarity part 601 and the second polarity part 602.To reduce The assembly work of current interruptions structure, the annular insulation strip 608 are integrally formed at the first polarity part 601 and the second polarity part 602 On.Specifically, can be realized by way of injection molding annular insulation strip 608 it is integrally formed with the first polarity part 601 and Between second polarity part 602.
For convenience can the operation for being injected into seal chamber of aerogenesis medium formed in cover body structure as shown in Figure 15 and Figure 19 There is medium injection hole 609, and blocking has sealing-plug 610 on the medium injection hole 609.In this way, can be in the current interruptions knot After structure is assembled on battery, then from the outside of battery injection solution-operated is carried out, fluid injection mode is more flexible and easy to operate.
For the benefit of space layout, and simplify the parts of current interruptions structure, first electrode terminal 611 is installed on cover board With second electrode terminal 613, the first polarity part 601 close to battery first electrode terminal 611 be arranged, and with the first electrode end Son 611 is electrically connected, and the cover board 612 is electrically connected with the second electrode terminal 613 of battery, and current interruptions structure is mounted on the first electricity On extreme son 611 or second electrode terminal 613.In this way, the first polarity part 601 can be facilitated to be established with first electrode terminal 611 Electrical connection, meanwhile, which can establish electrical connection by the cover board and second electrode terminal 613, To realize can aerogenesis medium be electrically connected with the positive or negative pole of battery, and simplification battery cover board assembly overall structure.
Specifically, in the embodiment party of the above-mentioned hood-like structure surrounded by first electrode terminal 611 and second electrode terminal 613 In formula, as shown in Figure 15, Figure 18 and Figure 19, which can be connected electrically in first electrode end by conductive connecting piece 625 On son 611.In addition, the cover edge structure by the cover board 612 fixed to battery to pass through the cover board and second electrode terminal 613 Establish electrical connection.
Wherein similarly with first embodiment and second embodiment, as shown in Figure 17 and Figure 18, current interruptions structure Further include the flip piece 614 being connected electrically between electrode inner terminal and electrode external terminal, the outer peripheral edge sealing of flip piece 614 and Insulated connection on the cover board, sealing packet and the inner surface gas connection of flip piece, under the gas pressure of gas, flip piece 614 actions are electrically connected with disconnecting with electrode inner terminal.Conduct piece 615, flip piece are fixed on the outer end face of electrode inner terminal 614 are connected electrically on conduct piece 615, and the indentation that can be disconnected by the gas pressure of gas is formed on conduct piece 615 616, which surrounds the tie point for connecting flip piece 614 and is arranged.One of the flip piece 614 and conduct piece 712 On be formed with boss 617, be formed with the connecting hole 618 for accommodating the boss 617 in another one, the boss 617 and connecting hole 618 it Between by annular solder joint be connected.So as to experience the air pressure for the gas for being flowed into inside battery from seal chamber in time, and break Open the electrical connection of cell inner end and cell inner end.
Further, to realize that the sealing that flip piece is stablized is assembled while, protection can be played to current interruptions structure It acts on, covering 622 is also covered on flip piece 614, covering 622 is electrically connected to form electrode external terminal with flip piece 614. In this way, covering 622 can be used as electrode external terminal, you can terminal boss is arranged by connections such as electrode leading-out sheets Part establishes current loop with the external world, such as can pass through between adjacent single battery or between adjacent cell module Electrode leading-out sheet is connected.
In addition, the outer peripheral edge of covering can be sealedly connected on sealing ring 620, in order to realize above-mentioned gas leak, The extraneous stomata 623 of connection is formed on covering 622.In addition, the stomata on covering is also possible that current interruptions structure Pressure difference is directly established with air, to realize the action of flip piece.
In the disclosure, for realize current interruptions structure can aerogenesis medium generate gas under the action of disconnect battery Electric current transmits, and as shown in figure 17, the through-hole passed through for second electrode terminal 613, second electrode is formed on the cover board 612 of battery Terminal 613 is fixed on cover board 612 by the dead ring 619 across the through-hole to insulate with cover board 612, outside flip piece 614 Periphery is formed on cover board 612 and is located at by sealing and being electrically connected on cover board 612 around the sealing ring 620 of dead ring 619 Air passing hole 621 between sealing ring 620 and dead ring 619.That is, second electrode terminal 613 passes sequentially through conduct piece 615, overturning Part 614, sealing ring 620 are electrically connected with cover board 612, and simultaneously by dead ring 619 and 613 insulation set of second electrode terminal, And the air passing hole 621 of connection flip piece 614 and inside battery is formed on cover board 612.In this way, when battery is overcharging outlet When, can aerogenesis medium 604 the voltage difference of the first polarity part 601 and the second polarity part 602 effect under can decompose generate gas after And the air pressure in seal chamber 603 increases, at this time under certain gas pressure, 605 pressure release of pressure release part, gas enters battery Inside is simultaneously connected with the flip piece 614.The air pressure of inside battery persistently increases, until disconnecting conduct piece 615 and flip piece 614 Between electrical connection, second electrode terminal 613 just can not with sealing ring 620, cover board 612 foundation be electrically connected, i.e., flip piece 614, Sealing ring 620 and cover board 612 are not charged, to realize the current interruptions of battery.
The battery cover board assembly of the 6th kind of embodiment of the disclosure is described above, is situated between below in conjunction with Figure 21 to Figure 25 The current interruptions component that 7th kind of embodiment of the disclosure that continues provides.
As shown in Figure 21 to Figure 25, which includes cover board, electrode inner terminal and electrode external terminal, electricity By installing current interruptions structure electrical connection on the cover board, and battery cover board assembly between pole inner terminal and electrode external terminal Further include the first afflux lead-out tablet 705 and the second afflux lead-out tablet 709 being electrically connected for the positive and negative anodes with battery core, and is used for Filling can aerogenesis medium and positioned at the sealing packet 704 of the inside of cover board, sealing wraps that be provided with respectively can aerogenesis medium phase with this The the first polarity part 701 and the second polarity part 702 of contact, the first polarity part are electrically connected with the first afflux lead-out tablet, the second polarity Part is electrically connected with the second afflux lead-out tablet, the voltage difference overrate between the first polarity part 701 and the second polarity part 702 When, can aerogenesis medium can generate gas, and the tearing sealing packet 704 under the gas pressure of the gas, so that gas is from close It is released in package 704 and is passed to current interruptions structure to be disconnected between electrode inner terminal and electrode external terminal by gas pressure Electrical connection.That is, different from the battery cover board assembly in other above-mentioned various embodiments, the seal chamber of the disclosure is by sealing Packet is surrounded.In this way, the sealing pack arrangement that can decompose gas can be individually produced, and it is assembled on the battery cell, from And the structural member using battery cell is avoided to surround the seal chamber, simplify the assembling process of battery cell, and simplify battery list The overall structure of body.
Unlike the first above-mentioned generation type to seal chamber in the 5th kind of embodiment, in present embodiment In, the sealing packet and the current interruptions structure that surround the seal chamber are independent from each other.Therefore, when single battery is in conventional shape When under state, as shown in Figure 21 to Figure 23, sealing packet in can aerogenesis medium do not react, chemical stability is good, not will produce gas Body, sealing packet is in sealing state at this time, thus single battery can normally carry out charge/discharge operation；And when single battery is incited somebody to action When will be close to precarious position, such as battery be in thermal runaway initial stage, this can aerogenesis medium 703 can decompose generate bulk gas with The tearing sealing packet 704 under the gas pressure of the gas, sealing at this time, which is wrapped, is in non-tight state, to by making in the air pressure The electrical connection between electrode inner terminal and the electrode external terminal is disconnected with the lower current interruptions structure.
Wherein, in the battery cover board assembly of the 7th kind of embodiment, process the sealing packet 704 for convenience, such as Figure 24 and Shown in Figure 25, which can be formed as wrapper, and the encapsulation port of the wrapper is configured to be made by the air pressure With the weak spot of tearing.In this way, under the gas pressure of gas, due to starting to accumulate gas, air pressure liter in sealing packet 704 Height, so that the weak spot is torn first, the gas in wrapper is discharged into the inside of battery, and makees in the air pressure With the lower electrical connection for disconnecting electrode inner terminal and electrode external terminal by the current interruptions structure.Specifically, which may be used also Think that such as aluminum plastic film insoluble in electrolyte is made.In other modes of texturing, what this can be torn by the gas pressure Weak spot can also be to be formed in thickness that the sealing the is wrapped score structure relatively thin compared with other regions.
For convenience of the first polarity part 701 and the second polarity part 702 fully with can aerogenesis medium be in contact, and conveniently It is electrically connected with the positive and negative anodes of battery, as shown in figures 24 and 25, the first polarity part 701 and the second polarity part 702 are respectively positioned on this Seal the inside of packet.Specifically, as shown in figure 24, there is the first lug 707 across sealing packet 704 on the first polarity part 701, There is the second lug 708 across sealing packet 704, the first lug 707 to be welded to the first afflux of battery on second polarity part 702 So that the first polarity part 701 and the first afflux lead-out tablet 705 establish electrical connection, the weldering of the second lug 708 on lead-out tablet 705 It is connected on the second afflux lead-out tablet 709 of battery so that the second polarity part 702 is electrically connected with the foundation of the second afflux lead-out tablet 709 Relationship, to realize in the sealing packet can aerogenesis medium be connected with the positive and negative anodes of battery.Wherein, the first lug 707 and second Lug 708 can be welded on the first polarity part 701 and the second polarity part 702.It is assembled to simplify, first lug 707 It can be integrally formed at respectively on the first polarity part 701 and the second polarity part 702 with the second lug 708, for example, by Extreme ear structure is integrally formed on one polarity part 701 and the second polarity part 702.In this way, by by the first polarity part 701 and the second pole Property part 702 is whole is positioned over inside wrapper, can improve can aerogenesis medium and the first polarity part 701 and the second polarity part Contact area between 702, to promoted can aerogenesis medium aerogenesis sensitivity.In addition, the first polarity part 701 and the second polarity As long as part 702 is at least partly packaged in the wrapper, so that it may with realize in wrapper can aerogenesis medium be in contact, therefore In other modes of texturing, the first polarity part 701 and the second polarity part 702 can also across the wrapper and just with batteries Cathode is electrically connected, i.e. the part of the two is located on the inside of the wrapper.
Further, the wrapper 704 is processed for convenience, and above-mentioned encapsulation port, which has, is located at the wrapper 704 opposite two First encapsulation port 706 and the second encapsulation port 716 at end, first lug 707 pass through and are sealably coupled to first encapsulation port 706 On, which passes through and is sealably coupled in second encapsulation port 716.In this way, the first encapsulation port 706 and the second envelope Dress mouth 716 has the function of pressure relief opening and lug installation simultaneously, to simplify the structure of the wrapper 704.
Specifically, for the benefit of spatial arrangement, the wrapper are formed as the strip structure extended along the length direction of battery, and First encapsulation port 706 and the second encapsulation port 716 are located at the different ends of the strip structure.In this way, due to the strip knot The extending direction of structure is consistent with the length direction of battery, so as to fully utilize the space of the inside battery, and not Excessive inside battery space can be occupied, harmful effect is not caused to the inner components of battery.
The sealing packet is fixed firmly on the first afflux lead-out tablet 705 and the second afflux lead-out tablet 709 for convenience, As shown in figure 24, the first lug 707 and the second lug 708 are all formed as having horizontal segment and the L-shaped conductive sheet of vertical section, this The vertical section of one lug 707 is posted and fixed onto the first afflux lead-out tablet 705, and the vertical section of the second lug 708 is bonded and consolidates It is fixed on the second afflux lead-out tablet 709, the horizontal segment of first lug 707 and the second lug 708 respectively with the first polarity part 701 It is connected with the second polarity part 702.In this manner it is possible to which so that the strip structure is vertically connected on the afflux lead-out tablet of battery both sides Between, and the vertical section provides sufficient contact area between afflux lead-out tablet and lug, so that sealing packet is firm Ground is fixed on the afflux lead-out tablet.
To avoid the wrapper from occupying excessive inside battery space, while ensureing the reliable structural strength of sealing packet, As shown in figure 25, the first polarity part 701 and the second polarity part 702 are respectively formed as opposite polarity first afflux conductive sheet and Also there is insulating trip 710, the first afflux conductive sheet, insulating trip 710, second to collect conductance for the inside of two afflux conductive sheets, wrapper Electric piece stacked above one another is simultaneously wound to form the flat structure of the length direction extension along the battery.In this way, by by insulating trip Be set between the first afflux conductive sheet and the second afflux conductive sheet, and be wound into along the battery length direction extension Flat structure, one side flat structure can enhance the overall construction intensity of the wrapper, and on the other hand the flat structure is along institute The length direction for stating battery extends, and can make full use of the inner space of battery, avoids the excessive space for occupying inside battery, makes It is more compact to obtain the encapsulation pack arrangement.
It should be noted that wrapper internal structure that present embodiment provides and lithium ion battery in the prior art Internal structure is essentially identical, and in the case where not departing from present inventive concept, the inner components of lithium ion battery in the prior art are same It can be applied to the encapsulation pack arrangement in present embodiment.The difference of the two is only introduced herein.Specifically, in this implementation In mode, it need not be arranged on the positive/negative plate of similar lithium ion battery on the first polarity part 701 and the second polarity part 702 and coat Positive and negative pole material.In addition, inside wrapper in the disclosure filling be it is above-mentioned be discussed in detail containing can aerogenesis medium Solution, thus also different from the electrolyte component of inside lithium ion cell in the prior art.
Based on this, the embodiment of property, the first afflux conductive sheet for example can be copper foil, the second afflux as an example Conductive sheet for example can be aluminium foil.Insulating trip for example can be PE (polyethylene, polyethylene) composite membranes or PP (Polypropylene, polypropylene) composite membrane.
In addition, the production method of wrapper and the production method of lithium ion battery that the disclosure provides are also essentially identical, One such production method is briefly introduced at this.It specifically, can be by such as copper foil for being not coated by positive and negative pole material The first afflux conductive sheet and the second afflux conductive sheet of such as aluminium foil between the insulating trip is set, and the three is wound into class Like the conductive electrode cored structure of lithium ion battery.The conductive electrode cored structure is for example encapsulated by aluminum plastic film, and two lugs are drawn, and point It is not welded on the afflux lead-out tablet of battery, it is in parallel with external battery battery core to realize.And it is injected in the aluminum plastic film By above-mentioned lithium salts, organic solvent, can the solution that mixes of aerogenesis medium, to realize, this can aerogenesis medium point under rated voltage Solution generates the purpose of gas.In this way, when the voltage difference being applied between the first polarity part 705 and the second polarity part 706 is more than to be somebody's turn to do It, can aerogenesis medium aerogenesis bulk gas when rated value so that the sealing of the aluminum plastic film is opened, the gas discharge in wrapper, from And the electric current for forcing the mechanical structure to disconnect battery transmits, and realizes the open circuit with battery and external circuit, improves the safety of battery Property.Such as can be the explosion-proof valve being arranged on battery.
Wherein similarly with first embodiment and second embodiment, as shown in Figure 21 and Figure 23, the current interruptions knot Structure can also include the flip piece 711 being connected electrically between electrode inner terminal and electrode external terminal, and the outer peripheral edge of flip piece is close Envelope and insulated connection is on the cover board, sealing packet and the inner surface gas connection of flip piece, under the gas pressure of gas, to turn over Turn the action of part 711 to be electrically connected with electrode inner terminal to disconnect.It is fixed with conduct piece 712 on the outer end face of electrode inner terminal, turns over Turn part 711 to be connected electrically on conduct piece 712, and is formed with the quarter that can be disconnected by the gas pressure of gas on conduct piece 712 Trace 713, the indentation 713 surround the tie point for connecting flip piece 711 and are arranged.One of flip piece 711 and conduct piece 712 On be formed with boss 714, be formed with the connecting hole 715 for accommodating the boss 714 in another one, the boss 714 and connecting hole 715 it Between by annular solder joint be connected.So as to experience the air pressure for the gas for being flowed into inside battery from sealing packet in time, and break Open the electrical connection of cell inner end and cell inner end.
Further, to realize that the sealing that flip piece is stablized is assembled while, protection can be played to current interruptions structure It acts on, covering 716 is also covered on flip piece 711, covering 716 is electrically connected to form electrode external terminal with flip piece 711.
In order to realize above-mentioned gas leak, the extraneous stomata 718 of connection is formed on covering 716.
The preferred embodiment of the disclosure is described in detail above in association with attached drawing, still, the disclosure is not limited to above-mentioned reality The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure Monotropic type, these simple variants belong to the protection domain of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the disclosure to it is various can The combination of energy no longer separately illustrates.
In addition, arbitrary combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally Disclosed thought equally should be considered as disclosure disclosure of that.

Claims (22)

1. a kind of battery cover board assembly, which is characterized in that including cover board, electrode inner terminal and electrode external terminal, in the electrode It is electrically connected by the current interruptions structure on the cover board between terminal and the electrode external terminal, the battery cover board Component further include for fill can aerogenesis medium (604) and be mounted on the cover board (612) outside seal chamber (603), institute State seal chamber (603) be constructed so that it is described can aerogenesis medium be electrically connected respectively with battery plus-negative plate, and the battery just When voltage difference overrate between the voltage difference between cathode, it is described can aerogenesis medium (604) gas can be generated, with The seal chamber (603) is broken through under the gas pressure of the gas so that the gas enters the inside of the battery and is passed to The current interruptions structure is to disconnect the electrical connection between the electrode inner terminal and the electrode external terminal by gas pressure.
2. battery cover board assembly according to claim 1, which is characterized in that the rated value value range be 4.5v~ 5v。
3. battery cover board assembly according to claim 1 or 2, which is characterized in that it is described can aerogenesis medium (604) include connection Benzene, tertiary pentyl be stupid, at least one of cyclohexyl benzene, terphenyl, cyclohexyl biphenyl and dibenzofurans.
4. battery cover board assembly according to claim 1, which is characterized in that the battery cover board assembly include respectively with institute State can aerogenesis medium the first polarity part (601) and the second polarity part (602) that are in contact, the first polarity part (601) and One of described second polarity part (602) with anode for being electrically connected, and another one with battery cathode for being electrically connected, institute It states the sealing of the first polarity part (601) and insulate and be connected on the second polarity part (602), to be integrally formed into towards in battery The hood-like structure of portion's opening, the opening in the cover body structure are also sealedly connected with pressure release part (605) to surround the seal chamber, The pressure release part (605) can rupture under the gas pressure to allow the inside of battery described in the gas flow.
5. battery cover board assembly according to claim 4, which is characterized in that the second polarity part (602) is fixed to institute It states on cover board to be electrically connected with the anode or battery cathode by the cover board.
6. battery cover board assembly according to claim 5, which is characterized in that mounting hole is formed on the cover board, it is described Second polarity part (602) is installed on the inner wall of the mounting hole so that the opening of the hood-like structure is towards in the battery Portion.
7. battery cover board assembly according to claim 4, which is characterized in that the first polarity part passes through conductive connecting piece (625) it is electrically connected with the electrode terminal for exposing the cover board.
8. battery cover board assembly according to claim 4, which is characterized in that be formed with first on the pressure release part (605) Indentation (606), which can be disconnected under the gas pressure so that the gas is via the pressure release part (605) it releases.
9. battery cover board assembly according to claim 8, which is characterized in that the pressure release part (605) is formed to have institute The pressure relief plate of the first indentation (606) is stated, is formed on the pressure relief plate and weakens deep gouge (607), first indentation (606) is located at should In the groove bottom wall for weakening deep gouge (607).
10. battery cover board assembly according to claim 8, which is characterized in that first indentation (606) is formed as both ends Non-rectilinear linear structure spaced apart.
11. battery cover board assembly according to claim 10, which is characterized in that the non-rectilinear linear structure is formed as excellent Arc structure.
12. battery cover board assembly according to claim 4, which is characterized in that the first polarity part (601) and the second pole Property part (602) between with longitudinal section in H-type structure annular insulation strip (608) so that the first polarity part (601) with Second polarity part (602) insulate, and the hood-like structure includes the cover body structure as the first polarity part (601), Yi Jizuo For the cover edge structure of the second polarity part (602), the edge that the cover body structure and cover edge structure are close is respectively embedded into and close It seals in the U-type groove of the opposite end of the H-type structure, outer peripheral edge and the cover board of the cover edge structure are fixedly linked.
13. battery cover board assembly according to claim 12, which is characterized in that be formed with medium note in the cover body structure Enter hole (609), and blocking there are removably sealing-plug (610) on the medium injection hole (609).
14. according to the battery cover board assembly described in any one of claim 4-13, which is characterized in that be equipped on the cover board First electrode terminal (611) and the second electrode terminal (613), the first polarity part (601) close to the battery the One electrode terminal (611) is arranged, and is electrically connected with the first electrode terminal (611), and the cover board (612) and the battery Second electrode terminal (613) is electrically connected, and the current interruptions structure is mounted on the first electrode terminal (611) or second electrode On terminal (613).
15. battery cover board assembly according to claim 1, which is characterized in that the current interruptions structure further includes being electrically connected The flip piece (614) being connected between the electrode inner terminal and the electrode external terminal, the outer peripheral edge of the flip piece (614) Sealing and it is insulated be connected on the cover board, the sealing packet and the inner surface gas connection of the flip piece, with described Under the gas pressure of gas, the flip piece (614) action is electrically connected with disconnecting with the electrode inner terminal.
16. battery cover board assembly according to claim 15, which is characterized in that solid on the outer end face of the electrode inner terminal Surely there is conduct piece (615), the flip piece (614) is connected electrically on the conduct piece (615), and the conduct piece (615) On be formed with the indentation (616) that can be disconnected by the gas pressure of the gas, which surrounds for connecting described turn over Turn the tie point setting of part (614).
17. battery cover board assembly according to claim 15, which is characterized in that be also covered on the flip piece (614) Covering (622), the covering (622) are electrically connected to form the electrode external terminal with the flip piece (614).
18. battery cover board assembly according to claim 17, which is characterized in that the company of being formed on the covering (622) Lead to extraneous stomata (623).
19. a kind of single battery, which is characterized in that the single battery includes shell, the battery core that is contained in the shell, feature It is, the single battery further includes the battery cover board assembly (600) according to any one of claim 1 to 18, described Cover board (612) encapsulates the shell, the positive and negative anodes of the battery core respectively with it is described can aerogenesis medium be electrically connected.
20. a kind of battery modules, which is characterized in that be provided with monomer electricity according to claim 19 in the battery modules Pond.
21. a kind of power battery pack, including backpack body and the battery modules that are arranged in the backpack body, which is characterized in that the battery Module is according to the battery modules described in claim 20.
22. a kind of electric vehicle, which is characterized in that the electric vehicle is provided with power battery according to claim 21 Packet.
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