CN106450120B - Secondary cell and battery modules - Google Patents

Secondary cell and battery modules Download PDF

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Publication number
CN106450120B
CN106450120B CN201611003970.2A CN201611003970A CN106450120B CN 106450120 B CN106450120 B CN 106450120B CN 201611003970 A CN201611003970 A CN 201611003970A CN 106450120 B CN106450120 B CN 106450120B
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CN
China
Prior art keywords
terminal
rotating sheet
cell
sheet
electrically
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Active
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CN201611003970.2A
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Chinese (zh)
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CN106450120A (en
Inventor
李全坤
林永寿
王鹏
朱涛声
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Jiangsu times Amperex Technology Limited
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Contemporary Amperex Technology Co Ltd
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Priority to CN201611003970.2A priority Critical patent/CN106450120B/en
Publication of CN106450120A publication Critical patent/CN106450120A/en
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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/04Construction or manufacture in general
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/502Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/543Terminals
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/572Means for preventing undesired use or discharge
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

This application involves energy storage device production technical field more particularly to a kind of secondary cell and battery modules.Secondary cell includes first terminal, Second terminal, coping plate, electrode assembly, the first rotating sheet and the second rotating sheet, at least one in first terminal and Second terminal is electrically insulated with coping plate, first rotating sheet attaches to first terminal, and the second rotating sheet attaches to Second terminal;Under normal conditions, the first pole piece is electrically connected by the first rotating sheet with first terminal, and the second pole piece is electrically connected by the second rotating sheet with Second terminal;When the pressure in secondary cell is more than reference pressure, the first rotating sheet and the second rotating sheet can be overturn, and be electrically connected first terminal and Second terminal;And the first rotating sheet disconnects its status of electrically connecting that itself and the second pole piece are disconnected with the status of electrically connecting of the first pole piece and/or the second rotating sheet.It even if the application automobile is in operating status, will not stop working suddenly, improve the safety of automobile.

Description

Secondary cell and battery modules
Technical field
This application involves energy storage device production technical field more particularly to a kind of secondary cell and battery modules.
Background technique
For EV hard shell battery, in order to solve the problems, such as to overcharge, the scheme that industry generallys use is cut before battery core failure Pond major loop is powered off, prevents battery from continuing to charge, to guarantee cell safety.Common structure are as follows: in first terminal and electrode group Failure of current structure is arranged in the major loop of part electrical connection, and Second terminal is electrically insulated with failure of current structure always, when battery mistake It fills, inside produces gas, and when air pressure inside increases to certain value, activated current cuts off structure, makes between first terminal and electrode assembly Open circuit prevents battery from continuing to charge.
However, other than overcharging, it, may be also due to unexpected internal short-circuit leads to internal production in normal use process Gas, activated current cut off structure, make to form open circuit between first terminal and electrode assembly, if automobile is just under steam at this time, And each secondary cell uses concatenated mode in battery modules, due to first terminal with Second terminal still in the shape that is electrically insulated State will lead to entire battery modules and power off, automobile is caused to stop working suddenly, even results in serious accident.
Summary of the invention
This application provides a kind of secondary cell and battery modules, are able to solve the above problem.
The first aspect of the application provides a kind of secondary cell, including first terminal, Second terminal, coping plate, electrode Component, the first rotating sheet and the second rotating sheet,
The electrode assembly is including the first pole piece, the second pole piece and between first pole piece and second pole piece Partition;
At least one in the first terminal and the Second terminal is electrically insulated with the coping plate,
First rotating sheet attaches to the first terminal, and second rotating sheet attaches to the Second terminal;
Under normal conditions, first pole piece is electrically connected by first rotating sheet with the first terminal, second pole Piece is electrically connected by second rotating sheet with the Second terminal;
When the pressure in the secondary cell is more than reference pressure, first rotating sheet and the second rotating sheet energy Enough overturnings, first rotating sheet and second rotating sheet after overturning are electrically connected with the coping plate respectively, make described the One terminal and Second terminal electrical connection;And first rotating sheet disconnects it and is electrically connected shape with first pole piece State and/or second rotating sheet disconnect the status of electrically connecting of itself and second pole piece;
Wherein, the secondary cell further includes the first conductive sheet, and under normal conditions, first pole piece passes sequentially through described first Conductive sheet, first rotating sheet are electrically connected with the first terminal;When the pressure in the secondary cell is more than reference pressure When, first rotating sheet, which can be overturn, disconnects first conductive sheet, to disconnect the first terminal and described first The electrical connection shape of pole piece;
And/or
The secondary cell further includes the second conductive sheet, and under normal conditions, it is conductive that second pole piece passes sequentially through described second Piece, second rotating sheet are electrically connected with the Second terminal;When the pressure in the secondary cell is more than reference pressure, institute Stating the second rotating sheet and capable of overturning disconnects second conductive sheet, to disconnect the Second terminal and second pole piece Status of electrically connecting.
It preferably, further include the shell closed with the coping plate lid, the coping plate and the shell surround accommodation space, The accommodation space includes for accommodating the first chamber of the electrode assembly, providing overturning space for first rotating sheet Second chamber and the third chamber in overturning space is provided for second rotating sheet, the first chamber is respectively with described second Chamber, the third chamber are not connected to.
Preferably, the first terminal includes first terminal ontology and the first extension interconnected, and described first prolongs Extending portion is equipped with the first through hole opposite with the coping plate, and first rotating sheet attaches to first extension, and seals The first through hole,
And/or
The Second terminal includes Second terminal ontology and the second extension interconnected, and second extension is equipped with Second through-hole opposite with the coping plate, second rotating sheet attaches to second extension, and seals described second Through-hole.
Preferably, the first terminal includes first terminal ontology and the first extension interconnected;It further include realizing The first seal sealed between the first chamber and the second chamber, the first seal are sealedly attached to described Between one extension and the coping plate.
Preferably, the Second terminal includes Second terminal ontology and the second extension interconnected, further includes realizing The second seal sealed between the first chamber and the third chamber, the second seal are sealedly attached to described Between two extensions and the coping plate.
Preferably, at least one of first rotating sheet and second rotating sheet are that convex type overturns structure, described Convex type overturning structure includes turning part and the first plush copper,
First plush copper is connected to turning part, and protrudes to the direction where institute's coping plate;
Turning part is sheet annuli arrangement,
When first rotating sheet is that the convex type overturns structure, the side of the turning part of first rotating sheet Edge is connect with the first terminal;Under normality, the first terminal by the turning part of first rotating sheet with it is described The electrical connection of first pole piece;
When second rotating sheet is that the convex type overturns structure, the side of the turning part of second rotating sheet Edge is connect with the Second terminal;Under normality, the Second terminal by the turning part of second rotating sheet with it is described The electrical connection of second pole piece.
Preferably, the convex type overturning structure further includes interconnecting piece, and the interconnecting piece is connected to the week of turning part Edge, the thickness of the interconnecting piece are greater than the thickness of turning part, and turning part is connected to described the by the interconnecting piece The inner wall of the inner wall of one through-hole or second through-hole.
It preferably, further include resistance unit, the Second terminal is electrically insulated with the coping plate, and the first terminal passes through institute It states resistance unit to be electrically connected with the coping plate, the resistance value of the resistance unit is 1~100000 ohm.
The second aspect of the application provides a kind of battery modules, including as above described in any item secondary cells, and each The secondary cell is serially connected.
Technical solution provided by the present application can achieve it is following the utility model has the advantages that
The first rotating sheet, the second overturning is respectively set in first terminal, Second terminal in secondary cell provided herein Piece, when battery overcharges, the first rotating sheet, the second rotating sheet are overturn, the first rotating sheet and the first pole piece disconnect and/or Second rotating sheet and the second pole piece disconnect, and the first rotating sheet, the second rotating sheet are electrically connected with coping plate, to make first end Son is conducted with Second terminal, at this point, the secondary cell can be used as conducting wire, still even if battery modules use series system It so keeps entire battery modules to be in channel status, therefore, even if automobile is in operating status, will not stop working suddenly, improve The safety of automobile.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited Application.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of specific embodiment of secondary cell provided herein;
Fig. 2 is a kind of explosive view of specific embodiment of secondary cell provided herein;
Fig. 3 is the cross-sectional view in Fig. 1 along line A-A;
Fig. 4 is a kind of partial schematic diagram of specific embodiment of secondary cell provided herein;
Fig. 5 is that secondary cell protrusions formula provided herein overturns a kind of structural representation of specific embodiment of structure Figure;
Fig. 6 is that a kind of structural schematic diagram of specific embodiment of conductive sheet is thinned in secondary cell provided herein;
Fig. 7 is a kind of another partial structural diagram of specific embodiment of secondary cell provided herein.
Appended drawing reference:
10- coping plate;
101- first row stomata;
20- first terminal;
201- first terminal ontology;
The first extension of 202-;
The first conducting block of 21-;
22- third insulating part;
The 4th insulating part of 23-;
24- third sealing element;
30- Second terminal;
301- Second terminal ontology;
The second extension of 302-;
The second conducting block of 31-;
The 5th insulating part of 32-;
The 6th insulating part of 33-;
The 4th sealing ring of 34-;
50- resistance unit;
The first rotating sheet of 70a-;
The second rotating sheet of 70b-;
701- turning part;
The first plush copper of 702-;
The second plush copper of 703-;
704- interconnecting piece;
705- installation protrusion;
The first conductive sheet of 71a-;
The second conductive sheet of 71b-;
The first conductive part of 711-;
The thinning area 712-;
The second conductive part of 713-;
The first venthole of 714-;
The second venthole of 715-;
The first insulating part of 72a-;
The second insulating part of 72b-;
73a- first seal;
73b- second seal.
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application Example, and together with specification it is used to explain the principle of the application.
Specific embodiment
The application is described in further detail below by specific embodiment and in conjunction with attached drawing.
As shown in figs. 1-7, the embodiment of the present application provides a kind of secondary cell, including first terminal 20, Second terminal 30, Coping plate 10, electrode assembly (not shown), the first rotating sheet 70a and the second rotating sheet 70b, secondary cell further include and push up The shell (not shown) that the lid of cover plate 10 closes.Electrode assembly include the first pole piece, the second pole piece and the first pole piece and this Partition between two pole pieces.
10 seal casinghousing of coping plate, the two surround accommodation space.At least one of first terminal 20 and Second terminal 30 Be electrically insulated setting with coping plate 10, i.e., first terminal 20 can be electrically insulated with coping plate 10 with Second terminal 30;It can also be only One is electrically insulated with coping plate 10, and another one is electrically connected (as shown in Figure 3) with coping plate 10.First rotating sheet 70a attaches to One terminal 20, the second rotating sheet 70b attach to Second terminal 30.Under normal conditions, the first pole piece passes through the first rotating sheet 70a and first Terminal 20 is electrically connected, and the second pole piece is electrically connected by the second rotating sheet 70b with Second terminal 30;When the pressure in secondary cell is super When crossing reference pressure, the first rotating sheet 70a and the second rotating sheet 70b can be overturn, the first rotating sheet 70a and second after overturning Rotating sheet 70b is electrically connected with coping plate 10 respectively, is electrically connected first terminal 20 and Second terminal 30;And the first rotating sheet 70a, which disconnects it and disconnects it with the status of electrically connecting of the first pole piece or the second rotating sheet 70b, is electrically connected shape with the second pole piece State can also be electrically connected with the status of electrically connecting of the first pole piece, the second rotating sheet 70b with the second pole piece with the first rotating sheet 70a State disconnects.
The first rotating sheet 70a, is respectively set in first terminal 20, Second terminal 30 in the secondary cell of above-described embodiment Two rotating sheet 70b, when battery overcharges, the first rotating sheet 70a, the second rotating sheet 70b are overturn, the first rotating sheet 70a It is disconnected with the disconnection of the first pole piece and/or the second rotating sheet 70b and the second pole piece, and the first rotating sheet 70a, the second rotating sheet 70b It is electrically connected with coping plate 10, to make first terminal 20 conduct with Second terminal 30, at this point, even if battery modules are using string Connection mode, the secondary cell can be used as conducting wire, still maintain entire battery modules and are in channel status, therefore, even if vapour Vehicle is in operating status, will not stop working suddenly, improves the safety of automobile.
Generally, first terminal 20, Second terminal 30 are respectively arranged in coping plate 10, for the ease of secondary cell and the external world Electrical connection, first terminal 20, Second terminal 30 can stretch out coping plate 10, especially in first terminal 20 or Second terminal 30 with coping plate 10 when being electrically insulated, and coping plate 10 is stretched out in one end of electrical isolation, as first terminal 20, Second terminal 30 are equal in Fig. 3 Stretch out coping plate 10.When first terminal 20 or Second terminal 30 stretch out coping plate 10, in order to guarantee first terminal 20, second The leakproofness of terminal 30 and coping plate 10 is usually sealed by sealing element or sealant, and in Fig. 4, first terminal 20 passes through Third sealing element 24 and coping plate 10 seal;In Fig. 7, Second terminal 30 is sealed by the 4th sealing element 34 with coping plate 10, Third sealing element 24, the 4th sealing element 34 can be sealing ring, gasket etc..
It is electrically connected to further facilitate first terminal 20, Second terminal 30 with extraneous, secondary cell further includes first Conducting block 21 and the second conducting block 31, the first conducting block 21 are connected with first terminal 20, the second conducting block 31 and second end Son 30 connects.
Specifically, coping plate 10 and the accommodation space that shell surrounds include for accommodate electrod component first chamber, be First rotating sheet 70a provides the second chamber in overturning space and provides the third chamber in overturning space for the second rotating sheet 70b, That is accommodation space is divided into first chamber, second chamber and third chamber by the first rotating sheet 70a, the second rotating sheet 70b, and first Chamber is not connected to second chamber, third chamber respectively, to guarantee the first rotating sheet 70a, the second rotating sheet 70b in secondary cell Interior pressure can be overturn when being more than reference pressure.Wherein, second chamber can be connected to third chamber, can not also be connected to, It is preferred that the two is not connected to, to prevent influence of the gas of two chambers to the first rotating sheet 70a, the second rotating sheet 70b.
In order to facilitate the connection of first terminal 20 and the first rotating sheet 70a, first terminal 20 includes interconnected first Terminal body 201 and the first extension 202, as shown in figure 3, first terminal ontology 201 passes through third sealing element 24 and coping plate 10 sealings, the first extension 202 is sealed with coping plate 10 by first seal 73a or sealant etc., in first terminal 20 When stretching out coping plate 10, coping plate 10 is stretched out in one end of usual first terminal ontology 201.First terminal ontology 201 prolongs with first Extending portion 202 can be structure as a whole, or separate structure.It is logical that first terminal 20 is equipped with opposite with coping plate 10 first Hole, when including the first extension 202, first through hole is set to the first extension 202, and the first rotating sheet 70a attaches to first and prolongs Extending portion 202, and the first rotating sheet 70a seals first through hole.
Specifically, the sealing of first chamber and second chamber can be realized by first seal 73a or sealant etc., Generally, outer circumferential setting of the first seal 73a along the first rotating sheet 70a.When being realized by first seal 73a, the One sealing element 73a, which can be sealedly attached between first terminal 20 and coping plate 10, (to be sealed when equipped with the first extension 202 and connects Be connected between the first extension 202 and coping plate 10) or first seal 73a be sealedly attached to the first rotating sheet 70a and top Between cover plate 10.First seal 73a have the primary sealing area in sealing contact with coping plate 10, and with the first extension 202 or the first rotating sheet 70a secondary sealing area in sealing contact, in general, primary sealing area and secondary sealing area are in coping plate It is opposite in 10 short transverse.
Similarly, in order to facilitate the connection of Second terminal 30 and the second rotating sheet 70b, Second terminal 30 includes interconnected Second terminal ontology 301 and the second extension 302, as shown in fig. 7, generally, Second terminal ontology 301 passes through the 4th sealing element 34 seal with coping plate 10, and the second extension 302 is sealed with coping plate 10 by second seal 73b or sealant etc., When Second terminal 30 stretches out coping plate 10, coping plate 10 is stretched out in one end of usual Second terminal ontology 301.Second terminal ontology 301 can be structure as a whole with the second extension 302, or separate structure.Second terminal 30 is equipped with and 10 phase of coping plate Pair the second through-hole, when including the second extension 302, the second through-hole is set to the second extension 302, and the second rotating sheet 70b is attached It is connected to the second extension 302, and the second rotating sheet 70b seals the second through-hole.
Specifically, the sealing of first chamber and third chamber can be realized by second seal 73b or sealant etc., Generally, outer circumferential setting of the second seal 73b along the second rotating sheet 70b.When being realized by second seal 73b, the Two sealing element 73b, which can be sealedly attached between Second terminal 30 and coping plate 10, (to be sealed when equipped with the second extension 302 and connects Be connected between the second extension 302 and coping plate 10) or second seal 73b be sealedly attached to the second rotating sheet 70b and top Between cover plate 10.Second seal 73b have the third sealing surface in sealing contact with coping plate 10, and with the second extension 302 or second rotating sheet 70b the 4th sealing surface in sealing contact, in general, third sealing surface and the 4th sealing surface are in coping plate It is opposite in 10 short transverse.
It is of course also possible to which only first terminal 20 includes first terminal ontology 201 and the first extension 202, or only second Terminal 30 includes Second terminal ontology 301 and the second extension 302.
When one of first terminal 20 and Second terminal 30 are electrically connected with coping plate 10, secondary cell can also include Resistance unit 50 one of is electrically connected with coping plate 10 and be electrically connected by resistance unit 50 with coping plate 10, with first terminal 20 with push up Cover plate 10 is electrically connected, and for Second terminal 30 is electrically insulated with coping plate 10, is electrically insulated for first terminal 20 with coping plate 10, the Two-terminal 30 is electrically connected with coping plate 10, as long as doing the replacement of adaptability.As shown in figure 3, first terminal 20 passes through resistance Part 50 is electrically connected with coping plate 10, by increasing resistance unit 50, can be reduced short circuit when secondary cell carries out drift bolt test and be returned The electric current on road guarantees the safety of drift bolt.Resistance unit 50 can be column structure, or laminated structure.
When including the first conducting block 21, resistance unit 50 is set between coping plate 10 and the first conducting block 21, coping plate 10 It is electrically connected by resistance unit 50, the first conducting block 21 with first terminal 20.When resistance unit 50 is column structure, the first conducting block It is electrically insulated between 21 and coping plate 10 by the 4th insulating part 23 or insulated paint, insulating cement, i.e. the first conducting block 21 and top cover It is not directly contacted with to form electrical connection between piece 10, need to be realized and be electrically connected by resistance unit 50, resistance unit 50 passes through the 4th insulating part After 23, both ends are connect with the first conducting block 21, coping plate 10 respectively.When resistance unit 50 is laminated structure, the first conducting block 21, Resistance unit 50 can be stacked with coping plate 10, to increase the reliability of connection.
Further, coping plate 10 is equipped with the first groove, one end insertion first that resistance unit 50 is electrically connected with coping plate 10 Groove;And first conducting block 21 be equipped with the second groove, the other end of resistance unit 50 is inserted into the second groove, to prevent resistance unit 50 Dislocation;It is of course also possible to which only coping plate 10 is equipped with the first groove or the first conducting block 21 is equipped with the second groove.
Wherein, when including that the second conducting block 31, Second terminal 30 are electrically insulated with coping plate 10, secondary cell further includes the Six insulating parts 33, are equipped with the 6th insulating part 33 between the second conducting block 31 and coping plate 10, the second conducting block 31 is exhausted by the 6th Edge part 33 is electrically insulated with coping plate 10.
In order to be preferably minimized the damage of drift bolt, the resistance value of resistance unit 50 is usually 1~100000 ohm, and such as 1 ohm, 100 ohm, 1000 ohm, 100000 ohm.
In the various embodiments described above, the first rotating sheet 70a and the second rotating sheet 70b can be convex type overturning structure, Structure can be overturn using only one as convex type, be below to be illustrated for convex type overturns structure by the first rotating sheet 70a.
As in Figure 3-5, convex type overturning structure includes turning part 701 and the first plush copper 702, the connection of the first plush copper 702 In turning part 701, usual first plush copper 702 is connected to the central area of turning part 701, and convex to the direction where coping plate 10 Out;Turning part 701 is sheet annuli arrangement.When the first rotating sheet 70a is that convex type overturns structure, the first rotating sheet 70a's The edge of turning part 701 is connect with first terminal 20, under normal conditions, first terminal 20 passes through the overturning of the first rotating sheet 70a Portion 701 is electrically connected with the first pole piece.By increasing by the first plush copper 702, the first rotating sheet 70a can be reduced with coping plate 10 each From reverses direction on distance, with when overcharging, the first rotating sheet 70a can be contacted with coping plate 10 rapidly.
In order to further decrease the stroke of the first rotating sheet 70a overturning, and the first rotating sheet 70a of guarantee and the first pole piece Connection reliability, convex type overturn structure further include the second plush copper 703, the second plush copper 703 is connected to turning part 701, and convex To the direction where electrode assembly, turning part 701 is electrically connected by the second plush copper 703 with the first pole piece under normal conditions.
It is planar structure generally, due to coping plate 10, the first pole piece, therefore, the correspondingly end face of the first plush copper 702, the The end face of two plush coppers 703 is also planar structure, to increase the first overturning after the first rotating sheet 70a and the first pole piece and overturning The contact area of piece 70a and coping plate 10.
The turning part 701 of first rotating sheet 70a can be entirely located in first through hole, also can connect in first through hole The periphery of end, the preferably turning part 701 of the turning part 701 of the first rotating sheet 70a is connected to the inner wall of first through hole, to shorten The overturning stroke of first rotating sheet 70a, while guaranteeing the overturning front and back connection reliability with the first pole piece, coping plate 10 respectively.
Further, in order to guarantee reliability that the first rotating sheet 70a is connect with coping plate 10, the periphery of turning part 701 It is additionally provided with interconnecting piece 704, the thickness of interconnecting piece 704 is greater than the thickness of turning part 701, and thickness refers to that convex type overturning structure is turned over along it Turn the size in direction, the turning part 701 of the first rotating sheet 70a is connected through portion 704 and is connected to first through hole.
Wherein, first through hole is preferably stepped hole, as shown in figure 4, the interconnecting piece 704 of the first rotating sheet 70a is overlapped in The cascaded surface of one through-hole can also be overlapped in first through hole when the first rotating sheet 70a is provided only with turning part 701 with turning part 701 Cascaded surface, above structure can limit the position of the first rotating sheet 70a, prevent under normal conditions, due to the first rotating sheet 70a It is connect loosening with first terminal 20, can not be contacted with coping plate 10 after causing the first rotating sheet 70a to overturn.
For the convenience of the first rotating sheet 70a connection, secondary cell further includes the first conductive sheet 71a, as shown in figure 4, Under normal conditions, the first pole piece passes sequentially through the first conductive sheet 71a, the first rotating sheet 70a is electrically connected with first terminal 20;When secondary electricity When pressure in pond is more than reference pressure, the first rotating sheet 70a, which can be overturn, disconnects the first conductive sheet 71a, to disconnect the The status of electrically connecting of one terminal 20 and the first pole piece facilitates processing and assembly by increasing by the first conductive sheet 71a.
Similarly, for the convenience of the second rotating sheet 70b connection, secondary cell further includes the second conductive sheet 71b, such as Fig. 7 Shown, under normal conditions, the second pole piece passes sequentially through the second conductive sheet 71b, the second rotating sheet 70b is electrically connected with Second terminal 30;When When pressure in secondary cell is more than reference pressure, the second rotating sheet 70b, which can be overturn, disconnects the second conductive sheet 71b, thus The status of electrically connecting for disconnecting Second terminal 30 and the second pole piece facilitates processing and assembly by increasing by the second conductive sheet 71b.
Specifically, the first conductive sheet 71a and the second conductive sheet 71b at least one be thinned conductive sheet, led below with first Electric piece 71a is to be thinned for conductive sheet, as shown in fig. 6, it includes the first conductive part 711,713 and of the second conductive part that conductive sheet, which is thinned, Thinning area 712, thinning area 712 is between the first conductive part 711 and the second conductive part 713, and its thickness is less than the first conduction The thickness of the thickness in portion 711 and the second conductive part 713;Wherein, the first conductive part 711 is connect with the first rotating sheet 70a, first When rotating sheet 70a is equipped with the second plush copper 703, directly it is connect with the second plush copper 703 of the first rotating sheet 70a;Second conductive part 713 It is connect with the first pole piece.Under normal conditions, the first rotating sheet 70a passes through the first conductive part 711 of the first conductive sheet 71a, thinning area 712, the second conductive part 713 is electrically connected with the first pole piece.By the way that thinning area 712 is arranged, while by the first conductive part 711 and first Rotating sheet 70a connection, the second conductive part 713 are connect with the first pole piece, can be quickly by the in the first rotating sheet 70a overturning One conductive sheet 71a is broken at thinning area 712, to fast implement the open circuit in secondary cell.
In general, conductive sheet, which is thinned, is equipped with venthole, venthole is opposite with the first rotating sheet 70a, as shown in Fig. 4,6, setting First venthole 714 or the second venthole 715, can also be arranged the first venthole 714 and the second venthole 715 simultaneously.The One venthole 714, the second venthole 715 penetrate through in the reverses direction of convex type overturning structure is thinned conductive sheet, so that secondary Gas in battery can be passed to the first rotating sheet 70a, and then overturn the first rotating sheet 70a.It is being equipped with turning part 701 When, when in order to guarantee that internal short-circuit produces gas, gas rapidly arrives at turning part 701, the second venthole 715 and the first rotating sheet 70a Turning part 701 it is opposite.
Further, in order to break thinned conductive sheet under lesser pulling force, thinning area 712 can be equipped with impression And disconnecting unit, or it is provided only with one of impression and disconnecting unit, wherein when being equipped with disconnecting unit, the first conductive part 711 and the Two conductive parts 713 are disconnected in disconnecting unit.
Usual first conductive part 711 is additionally provided with mounting hole, and convex type overturns structure and is equipped with installation protrusion 705, installation protrusion 705 can connect in the second plush copper 703, and installation protrusion 705 is inserted into mounting hole, to guarantee conductive sheet 71 and the first rotating sheet 70a Connection precision, and then guarantee under preset pulling force effect, thinned conductive sheet can be broken.Mounting hole can for through-hole or Person's blind hole, when for through-hole, mounting hole and the first venthole 714 can be same through-hole.
The first conductive sheet 71a and first terminal 20 directly contacts formation electrical connection in order to prevent, the first conductive sheet 71a and The contact position of first terminal 20 realized by insulation system, insulating cement or insulated paint, and insulation system can be for such as the in Fig. 4 Between the first conductive sheet 71a and the first rotating sheet 70a, the first insulating part 72a is set one insulating part 72a, the first insulating part 72a Have a third through-hole, the first rotating sheet 70a, third through-hole and when being equipped with the first conductive part 711 first conductive sheet 71a first Conductive part 711 is opposite.
Second conductive part 713 can be fixed by the modes such as bonding, screw and first terminal 20 or Second terminal 30, is It preferably fixes the first conductive sheet 71a and then guarantee can be electrically disconnected with it rapidly after first rotating sheet 70a overturning, first is conductive Piece 71a can be fixed on first terminal 20, this mode by the first insulating part 72a, and the first insulating part 72a plays insulation simultaneously With fixed effect, amount of parts is saved, simplifies assembly process.
According to above-described embodiment, when the second rotating sheet 70b is that convex type overturns structure, it is only necessary to will be in above-described embodiment First terminal 20 is changed to Second terminal 30, and first through hole is changed to the second through-hole, such as the turning part 701 of the second rotating sheet 70b Edge connect with Second terminal 30, under normal conditions, Second terminal 30 passes through the turning part 701 of the second rotating sheet 70b and the The electrical connection of two pole pieces, when being equipped with interconnecting piece 704, the turning part 701 of the second rotating sheet 70b passes through the company of the second rotating sheet 70b Socket part 704 is connected to the inner wall of the second through-hole.
Equally, when the second conductive sheet 71b is that conductive sheet is thinned, it is only necessary to be changed to the first terminal 20 in above-described embodiment Second terminal 30, first through hole is changed to the second through-hole, the first rotating sheet 70a is changed to the second rotating sheet 70b.
Similarly, the contact position of the second conductive sheet 71b and Second terminal 30 is real by insulation system, insulating cement or insulated paint Existing, insulation system can be located at the second conductive sheet 71b and second for such as the second insulating part 72b, the second insulating part 72b in Fig. 7 Between rotating sheet 70b, the second insulating part 72b is equipped with fourth hole, the second rotating sheet 70b, fourth hole and equipped with first The first conductive part 711 of second conductive sheet 71b is opposite when conductive part 711.Second conductive sheet 71b can also pass through the second insulating part 72b and Second terminal 30 are fixed.
In addition, the air pressure in order to avoid second chamber hinders the overturning of the first rotating sheet 70a, coping plate 10 is additionally provided with first Gas vent 101, first row stomata 101 is opposite with the first rotating sheet 70a, and penetrates through along the thickness direction of coping plate 10.Similarly, it is The air pressure of third chamber is avoided to hinder the overturning of the second rotating sheet 70b, coping plate 10 is additionally provided with second row stomata, second exhaust Hole is opposite with the second rotating sheet 70b, and penetrates through along the thickness direction of coping plate 10.
Wherein, when first terminal 20 or Second terminal 30 are electrically insulated with coping plate 10, insulating part, insulating cement can be passed through Or insulated paint is realized, in Fig. 4, first terminal 20 is electrically insulated by third insulating part 22 with coping plate 10;In Fig. 7, the Two-terminal 30 is electrically insulated by the 5th insulating part 32 with coping plate 10.Wherein, third insulating part 22 and the first insulating part 72a can be with It is structure as a whole, the 5th insulating part 32 and the second insulating part 72b may be integral structure.
In the various embodiments described above, in general, first terminal 20 is positive terminal, Second terminal 30 is negative terminal, correspondingly, First pole piece is positive plate, and the second pole piece is negative electrode tab, especially when first terminal 20 is electrically connected with coping plate 10, to prevent electricity Solve corrosion of the liquid to shell.It is of course also possible to which first terminal 20 is negative terminal, Second terminal 30 is positive terminal, correspondingly, First pole piece is negative electrode tab, and the second pole piece is positive plate.
The application also provides a kind of battery modules, the secondary cell provided including any embodiment as above.Secondary cell is set Have it is multiple, can be parallel with one another between each secondary cell, can also be serially connected, especially series connection when, using any of the above-described implementation The secondary cell of example causes rotating sheet 70 to activate, entire battery modules will not be caused to power off, to guarantee even if accident occurs The stability of battery modules.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.

Claims (9)

1. a kind of secondary cell, which is characterized in that including first terminal, Second terminal, coping plate, electrode assembly, the first overturning Piece and the second rotating sheet,
The electrode assembly include the first pole piece, the second pole piece and between first pole piece and second pole piece every Plate;
At least one in the first terminal and the Second terminal is electrically insulated with the coping plate,
First rotating sheet attaches to the first terminal, and second rotating sheet attaches to the Second terminal;
Under normal conditions, first pole piece is electrically connected by first rotating sheet with the first terminal, and second pole piece is logical Second rotating sheet is crossed to be electrically connected with the Second terminal;
When the pressure in the secondary cell is more than reference pressure, first rotating sheet and second rotating sheet can be turned over Turn, first rotating sheet and second rotating sheet after overturning are electrically connected with the coping plate respectively, make the first end The sub and described Second terminal electrical connection,
And first rotating sheet disconnects its status of electrically connecting with first pole piece and/or the second overturning segment Open the status of electrically connecting of itself and second pole piece;
Wherein, the secondary cell further includes the first conductive sheet, and under normal conditions, it is conductive that first pole piece passes sequentially through described first Piece, first rotating sheet are electrically connected with the first terminal;When the pressure in the secondary cell is more than reference pressure, institute Stating the first rotating sheet and capable of overturning disconnects first conductive sheet, to disconnect the first terminal and first pole piece It is electrically connected shape;
And/or
The secondary cell further includes the second conductive sheet, and under normal conditions, second pole piece passes sequentially through second conductive sheet, institute The second rotating sheet is stated to be electrically connected with the Second terminal;When the pressure in the secondary cell is more than reference pressure, described the Two rotating sheets, which can be overturn, disconnects second conductive sheet, to disconnect being electrically connected for the Second terminal and second pole piece Connect state.
2. secondary cell according to claim 1, which is characterized in that further include the shell closed with the coping plate lid, institute It states coping plate and the shell surrounds accommodation space, the accommodation space includes the first chamber for accommodating the electrode assembly Room, the second chamber that overturning space is provided for first rotating sheet and provide overturning space for second rotating sheet the Three chambers, the first chamber are not connected to the second chamber, the third chamber respectively.
3. secondary cell according to claim 2, which is characterized in that the first terminal includes first end interconnected Sub- ontology and the first extension, first extension are equipped with the first through hole opposite with the coping plate, first overturning Piece attaches to first extension, and seals the first through hole,
And/or
The Second terminal includes Second terminal ontology and the second extension interconnected, and second extension is equipped with and institute The second opposite through-hole of coping plate is stated, second rotating sheet attaches to second extension, and seals second through-hole.
4. secondary cell according to claim 3, which is characterized in that the first terminal includes first end interconnected Sub- ontology and the first extension;It further include realizing the first seal sealed between the first chamber and the second chamber, The first seal is sealedly attached between first extension and the coping plate.
5. secondary cell according to claim 3, which is characterized in that the Second terminal includes second end interconnected Sub- ontology and the second extension further include realizing the second seal sealed between the first chamber and the third chamber, The second seal is sealedly attached between second extension and the coping plate.
6. secondary cell according to claim 3, which is characterized in that in first rotating sheet and second rotating sheet At least one overturns structure for convex type, and convex type overturning structure includes turning part and the first plush copper,
First plush copper is connected to turning part, and protrudes to the direction where institute's coping plate;
Turning part is sheet annuli arrangement,
When first rotating sheet be the convex type overturn structure when, the edge of the turning part of first rotating sheet with The first terminal connection;Under normality, the first terminal passes through the turning part and described first of first rotating sheet Pole piece electrical connection;
When second rotating sheet be the convex type overturn structure when, the edge of the turning part of second rotating sheet with The Second terminal connection;Under normality, the Second terminal passes through the turning part and described second of second rotating sheet Pole piece electrical connection.
7. secondary cell according to claim 6, which is characterized in that the convex type overturning structure further includes interconnecting piece, The interconnecting piece is connected to the periphery of turning part, and the thickness of the interconnecting piece is greater than the thickness of turning part, described to turn over Transfer part is connected to the inner wall of the first through hole or the inner wall of second through-hole by the interconnecting piece.
8. secondary cell according to claim 1-7, which is characterized in that it further include resistance unit, the second end Sub to be electrically insulated with the coping plate, the first terminal is electrically connected by the resistance unit with the coping plate, the resistance unit Resistance value be 1~100000 ohm.
9. a kind of battery modules, which is characterized in that including at least two described in any item secondary cells of claim 1-8, and Each secondary cell is serially connected.
CN201611003970.2A 2016-11-15 2016-11-15 Secondary cell and battery modules Active CN106450120B (en)

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CN106784566B (en) * 2017-01-16 2019-10-22 宁德时代新能源科技股份有限公司 Secondary cell and battery modules
KR20180135594A (en) * 2017-06-13 2018-12-21 삼성에스디아이 주식회사 Secondary battery having positive electrode terminal and membrane-integrated cap plate
CN109728208A (en) * 2017-10-27 2019-05-07 宁德时代新能源科技股份有限公司 Cap assembly, secondary cell and the battery modules of secondary cell
CN110492023A (en) * 2019-08-15 2019-11-22 合肥国轩高科动力能源有限公司 A kind of rectangular aluminum hull lithium battery cover plate

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CN102738522A (en) * 2011-03-30 2012-10-17 Sb锂摩托有限公司 Secondary battery
CN105098108A (en) * 2015-07-23 2015-11-25 宁德时代新能源科技有限公司 Head cover structure of power battery and power battery

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102738522A (en) * 2011-03-30 2012-10-17 Sb锂摩托有限公司 Secondary battery
CN105098108A (en) * 2015-07-23 2015-11-25 宁德时代新能源科技有限公司 Head cover structure of power battery and power battery

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