CN109792031A - Secondary cell - Google Patents
Secondary cell Download PDFInfo
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- CN109792031A CN109792031A CN201680088924.9A CN201680088924A CN109792031A CN 109792031 A CN109792031 A CN 109792031A CN 201680088924 A CN201680088924 A CN 201680088924A CN 109792031 A CN109792031 A CN 109792031A
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- Prior art keywords
- terminal
- secondary cell
- pole piece
- contact chip
- coping plate
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- 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
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A kind of secondary cell, the secondary cell includes: electrode assembly (31), first terminal (11), Second terminal (21) and coping plate (41), electrode assembly (31) includes the first pole piece, second pole piece and the partition being arranged between the first pole piece and the second pole piece, first pole piece is electrically connected with first terminal (11), second pole piece is electrically connected with Second terminal (21), secondary cell further include: resistive elements (24), the conductive sheet (22) for attaching to the contact chip (12) of first terminal (11) and being electrically connected with Second terminal (21), coping plate (41) is electrically connected with first terminal (11) always by resistive elements (24), with Second terminal (21) and conductive sheet (22) insulation set；When the internal pressure of secondary cell is more than reference pressure; contact chip (12) is acted under gas pressure and is contacted with conductive sheet (22); to form the electrical communication path by the first pole piece, first terminal (11), contact chip (12), conductive sheet (22), Second terminal (21) and the second pole piece; the program realizes both sides protection to secondary cell, improves the safety of secondary cell.
Description
This application involves energy storage device technical field more particularly to a kind of secondary cells.
Electric car and energy-accumulating power station etc., which generally require, uses the secondary cell with large capacity as power supply.These secondary cells are in addition to high capacity, should also have good safety to can be only achieved using standard and meet the needs of people.
On the one hand, when secondary cell by conductor from outside through when, there is a situation where inside battery core short-circuit between positive plate and negative electrode tab, at this moment, one resistance is set usually between coping plate and pole, and the resistance value of the resistance is usually larger, to reduce the short circuit current by positive plate and negative electrode tab, in order to avoid cause battery core out of control.
On the other hand, when secondary cell is during quick charge or high power discharge, the excessive heat production of inside meeting, and electrolyte may decompose, the generation of this heat and the decomposition of electrolyte are so that the pressure inside secondary cell increases, it may cause secondary cell kindling and explosion, at this moment, often by an external short circuit structure, such as, contact chip is connected on coping plate, conductive sheet is connected on pole, contact chip movement and conductive sheet are in electrical contact with short-circuit between the positive plate and negative electrode tab by secondary cell, and, fuse part is in series in short circuit current, short circuit current is fused fuse part, cut off current loop, stop filling for secondary cell, discharge condition.
However, above-mentioned two aspect makes occur contradiction in the selection of resistance, on the one hand require resistance larger, to reduce short circuit current, on the other hand, and requires resistance smaller, short circuit current is fused fuse part.
In the related technology, above-mentioned contradiction can also be solved by the way that two contact chips are arranged in the secondary battery, still, the coherence request that this acts two contact chips is higher, otherwise, if one of akinesia in two contact chips, the safety of secondary cell will be reduced.
Summary of the invention
The embodiment of the present application provides a kind of secondary cell, can solve above-mentioned contradiction, improves secondary
The safety of battery.
This application provides a kind of secondary cells, comprising: electrode assembly, first terminal, Second terminal and coping plate,
The electrode assembly includes the first pole piece, the second pole piece and the partition being arranged between first pole piece and second pole piece, and first pole piece is electrically connected with the first terminal, and second pole piece is electrically connected with the Second terminal,
The secondary cell further include: resistive elements, the conductive sheet for attaching to the contact chip of the first terminal and being electrically connected with the Second terminal,
The coping plate is electrically connected with the first terminal always by the resistive elements, with the Second terminal and the conductive sheet insulation set；
When the internal pressure of the secondary cell is more than reference pressure, the contact chip is acted under gas pressure and is contacted with the conductive sheet, to form the electrical communication path by first pole piece, the first terminal, the contact chip, the conductive sheet, the Second terminal and second pole piece.
It preferably, further include shell, the coping plate and the case lid close the first chamber to be formed for encapsulating the electrode assembly and provide the second chamber of motion space for the contact chip,
The first chamber is separated with the second chamber by the contact chip, and the conductive sheet is located at the side far from the electrode assembly of the coping plate.
Preferably, the coping plate is equipped with through-hole, and the conductive sheet has the contact portion that can be contacted with the contact chip after movement, and the contact portion is located in the second chamber.
Preferably, the coping plate includes body part and bump, and the side that the bump is directed away from the shell is prominent, and the second chamber is surrounded by the contact chip and the bump, and the through-hole is arranged on the bump.
Preferably, the first terminal includes the terminal body being connected and extension,
Opening, through-hole described in the opening face are offered on the extension, the contact chip seals the opening, the first chamber and the second chamber are separated.
Preferably, the terminal body and the extension are an integral structure or split type structure.
Preferably, it further include the containment member being sealed between the first chamber and the second chamber, the containment member is sealedly attached between the extension and the coping plate, and is connect with the primary sealing area in sealing contact with the coping plate and with extension sealing
The secondary sealing area of touching.
Preferably, it further include the containment member being sealed between the first chamber and the second chamber, the containment member is sealed between the contact chip and the coping plate, and has the primary sealing area in sealing contact with the coping plate and the secondary sealing area in sealing contact with the contact chip.
Preferably, extending direction of the primary sealing area with the secondary sealing area along the coping plate is oppositely arranged, and/or
Short transverse of the primary sealing area with the secondary sealing area along the secondary cell is oppositely arranged.
Preferably, the contact chip includes turning part and plush copper,
Turning part is sheet annuli arrangement,
The plush copper is connected to turning part, and protrudes towards the side of the coping plate,
The outer edge of turning part and the extension are tightly connected, and can be contacted by the plush copper with the contact portion when contact chip movement.
It preferably, further include first end daughter board, the first terminal is electrically connected with the first end daughter board, and the resistive elements are series between the first end daughter board and the coping plate.
Preferably, the resistive elements have a first end and a second end,
The first recess portion is offered on the coping plate, the first end is embedded in first recess portion,
And/or
The second recess portion is offered on the first end daughter board, the second end is embedded in second recess portion.
Preferably, the range of the resistance value of the resistive elements is 2 ohm~200000 ohm.
Preferably, it further include fusible member, the fusible member is series at the area of passage in the electrical communication path by first pole piece, the first terminal, the contact chip, the conductive sheet, the Second terminal and second pole piece, at the fusible member less than area of passage at the rest of in the electrical communication path；And
The fusible member is series between first pole piece and the first terminal, and/or
The fusible member is series between second pole piece and the Second terminal.
It preferably, further include the first connector and the second connector,
First pole piece is electrically connected by first connector with the first terminal, and second pole piece is electrically connected by second connector with the Second terminal,
The fusible member is formed on first connector and/or second connector.
Preferably, the fusible member is by opening up notch on the first connector and/or on the second connector and/or hole is formed
Technical solution provided by the present application can achieve it is following the utility model has the advantages that
This application provides a kind of secondary cells, including coping plate, first terminal and Second terminal, contact chip, conductive sheet and resistive elements.Contact chip attaches to first terminal, and conductive sheet is electrically connected with Second terminal, and coping plate is electrically connected via resistive elements with first terminal, and with Second terminal and conductive sheet insulation set.When air pressure inside secondary cell increases and is more than reference pressure, contact chip is acted under gas pressure and is contacted with conductive sheet, to form the electrical communication path by the first pole piece, first terminal, contact chip, conductive sheet, Second terminal and second pole piece, in this electrical communication path, it is short-circuit between first pole piece and the second pole piece, reduce the risk of secondary cell kindling or explosion；Furthermore, when secondary cell is passed through by external conductor, secondary cell forms the electrical communication path by the second pole piece, conductor, coping plate, resistive elements, first terminal, the first pole piece and the second pole piece, in this electrical communication path, resistive elements reduce the short circuit current in the path, reduce the probability that more major break down occurs for secondary cell.In the application; electrical communication path where electrical communication path and resistive elements that contact chip is formed after contacting with conductive sheet is belonging respectively to two different paths; it solves contradiction when setting resistance, both sides protection is realized to secondary cell, improves the safety of secondary cell.
It should be understood that the above general description and the following detailed description are merely exemplary, the application can not be limited.
Fig. 1 is the isometric exploded view of secondary cell part-structure provided by the embodiment of the present application；
Fig. 2 is the cross-sectional view of secondary cell part-structure provided by the embodiment of the present application；
Fig. 3 is the cross-sectional view of first terminal and contact chip decomposition view provided by the embodiment of the present application；
Fig. 4 is under first terminal provided by the embodiment of the present application and contact chip connection status
Cross-sectional view；
Fig. 5 is the enlarged view at the position A in Fig. 2；
Fig. 6 is the schematic diagram of the embodiment one of the sealing structure provided by the embodiments of the present application being sealed between first chamber and second chamber；
Fig. 7 is the schematic diagram of the embodiment two of the sealing structure provided by the embodiments of the present application being sealed between first chamber and second chamber；
Fig. 8 is the schematic diagram of the embodiment three of the sealing structure provided by the embodiments of the present application being sealed between first chamber and second chamber.
Appended drawing reference:
11- first terminal；
111- terminal body；
112- extension；
112a- opening；
112b- column；
112c- cascaded surface；
12- contact chip；
121- plush copper；
The second contact plane of 121a-；
122- turning part；
13- containment member；
131- primary sealing area；
132- secondary sealing area；
14- fusible member；
15- first end daughter board；
The first connector of 16-；
The first insulating cell of 17-；
21- Second terminal；
22- conductive sheet；
221- contact portion；
The first contact plane of 221a-；
23- insulating component；
The hole 231-；
24- resistive elements；
25- second end daughter board；
The second connector of 26-；
The second insulating cell of 27-；
41- coping plate；
411- body part；
412- bump；
413- through-hole.
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets embodiments herein, and is used to explain the principle of the application together with specification.
The application is described in further detail below by specific embodiment and in conjunction with attached drawing.The application is described in further detail below by specific embodiment and in conjunction with attached drawing."front", "rear" described in text, "left", "right", "upper", "lower" are using the placement status of the secondary cell in attached drawing as reference.
As shown in figures 1-8, the embodiment of the present application provides a kind of secondary cell, which includes first terminal 11 and Second terminal 21, and first terminal 11 can connect to form current loop with Second terminal 21 with external circuit, secondary cell outwardly exports electric energy as the power supply in external circuit.
Wherein, first terminal 11 may be used as positive terminal, and correspondingly, Second terminal 21 is used as negative terminal, and vice versa.In the following, the application is using first terminal 11 as positive terminal (the first pole piece is positive plate), Second terminal 21 as secondary cell provided by the present application being described in detail for negative terminal (the second pole piece is negative electrode tab).
As shown in Figure 1, secondary cell generally includes electrode assembly and shell (being not shown in figure) and coping plate 41, shell and coping plate 41 can close to form accommodating chamber by modes lids such as welding, and electrode assembly is housed in accommodating chamber.
Electrode assembly generally includes the first pole piece and the second pole piece, has the first pole on the first pole piece
Ear has the second tab on the second pole piece, and the first pole piece is electrically connected via the first tab with first terminal 11, and the second pole piece is electrically connected via the second tab with Second terminal 21, so that electric energy is finally outwardly exported by electrode assembly.
As shown in Figure 1, secondary cell provided by the embodiments of the present application further includes conductive sheet 22, contact chip 12 and resistive elements 24.
On the one hand, contact chip 12 attaches to first terminal 11, conductive sheet 22 is electrically connected to Second terminal 21, when the internal pressure of secondary cell is more than reference pressure, contact chip 12 is acted under the influence of air pressure and is contacted with conductive sheet 22, to form the electrical communication path by the first pole piece, first terminal 11, contact chip 12, conductive sheet 22, Second terminal 21 and the second pole piece.
Wherein, contact chip 12 and first terminal 11 can be integral structure, be also possible to split type structure；Conductive sheet 22 can be the two with the electric connection mode of Second terminal 21 and directly contact and be connected with each other, it can also be that conductive sheet 22 is connect by other electric conductors with Second terminal 21, the application is not construed as limiting this, as long as conductive sheet 22 and Second terminal 21 can be realized the conducting of electric current.
Contact chip 12 acted under gas pressure and the mode that is contacted with conductive sheet 22 can be directly contact between the two or contact chip 12 and conductive sheet 22 between other electric conductors be set make 22 mediate contact of contact chip 12 and conductive sheet.
According to above description, secondary cell is during charge and discharge, when the inner transition heat production of secondary cell or electrolyte decomposition, and when thereby resulting in the pressure increase of inside battery, and internal pressure be more than reference pressure when, contact chip 12 act under gas pressure and is contacted with conductive sheet 22 so that secondary cell formation external short circuit state, the risk of secondary cell explosion and kindling is thus reduced, the safety of secondary cell is improved.
On the other hand, coping plate 41 is electrically connected with first terminal 11 always via resistive elements 24, also, coping plate 41 and 22 insulation set of Second terminal 21 and conductive sheet.
When secondary cell is caused to be shorted the first pole piece and the second pole piece by conductor across (such as when carrying out drift bolt test), the short circuit current flows through the second pole piece, conductor, coping plate 41, resistive elements 24, first terminal 11, the first pole piece, the setting of resistive elements 24 can be such that short circuit current is substantially reduced, there is the probability of the bigger peril such as thermal runaway to reduce secondary cell, and improves the safety of secondary cell.
It is arranged by above-mentioned both sides, contact chip 12 contacts being electrically connected for formation with conductive sheet 22
Electrical communication path where connecing path and resistive elements 24 is belonging respectively to two different short circuit paths, solves contradiction when setting resistance, and realize both sides protection to secondary cell, improves the safety of secondary cell.
As shown in Figure 2, it further include first end daughter board 15 in secondary cell, first end daughter board 15 is electrically connected with first terminal 11, in this case, resistive elements 24 can be series between first end daughter board 15 and coping plate 31, in this way, short circuit current flows through coping plate 31, resistive elements 24, second end daughter board 25 and Second terminal 21.
It correspondingly, can also include second end daughter board 25 in secondary cell, conductive sheet 22 is just electrically connected via second end daughter board 25 with Second terminal 21.Furthermore, it is desirable to which explanation, the setting of first end daughter board 15 and second end daughter board 25 can be convenient the connection between first terminal 11 and Second terminal 21 and external circuit, it is arranged for convenience of assembly, but not necessarily.
In these cases, column resistance can be selected in resistive elements 24, and resistive elements 24 can be secured directly between first end daughter board 15 and coping plate 41, to facilitate the setting of resistive elements 24.
Specifically, according to one embodiment, as shown in Figure 2, resistive elements 24 have along its axial first end and second end, the first recess portion is offered on coping plate 41, the first end of resistive elements 24 is embedded in the first recess portion, and second end and first end daughter board 15 are against such resistive elements 24 can be reliably fixed in the first recess portion.
According to another embodiment, the second recess portion can also be offered on first end daughter board 15, and the second end of resistive elements 24 is embedded in the second recess portion, and first end and coping plate 41 are against resistive elements 24 are equally reliably fixed.
Further, it is also possible to above-mentioned two embodiments combination settings are offered the first recess portion on coping plate 41, also, the second recess portion is offered simultaneously on first end daughter board 15, the first end and second end of resistive elements 24 is embedded respectively in the first recess portion and the second recess portion.After such setting, the both ends of resistive elements 24 are limited simultaneously, and the reliability being electrically connected between first end daughter board 15 and coping plate 41 further increases.
It should be pointed out that the one end of first terminal 11 far from coping plate 31 is electrically connected via first end daughter board 15, resistive elements 24 with coping plate 31, one end of close coping plate 31 is insulated by the first insulating cell 17 with coping plate 31, to form required electrical communication path.
It will be appreciated by those skilled in the art that when secondary cell normal operating, normal current according to
It is secondary to flow through first end daughter board 15, first terminal 11 and the first pole piece, although resistive elements 24 exist, but not influence the output of secondary cell when normal operating.
The resistance value of resistive elements 24 can be chosen between 2 ohm~200000 ohm, and resistive elements 24 can select high temperature resistant resistance, such as, be carbonized silicon resistor and conductivity ceramics, the resistance value of carbonization silicon resistor is 10 ohm, and highest bearing temperature is greater than 600 DEG C, and the resistance value of conductivity ceramics is 500 ohm.In addition, resistive elements 24 can also use cyclic structure, and it is set on first terminal 11.
Under normal conditions, a part of first terminal 11 and Second terminal 21 is stretched out respectively outside coping plate 41, and extension is connect with external circuit.In some embodiments, first terminal 11 may not necessarily also stretch out outside coping plate 41, for example, first terminal 11 can be realized via coping plate 41 and is electrically connected with external circuit in the embodiment that first terminal 11 is used as positive terminal.Also, when being electrically connected coping plate 41 with the first terminal 11 for being used as anode, shell is positively charged with coping plate 41, can also reduce corrosion of the electrolyte to shell and coping plate 41, prolong the service life.
As shown in Fig. 2, more precisely, the accommodating chamber formed after shell and the lid conjunction of coping plate 41 includes first chamber S1 and second chamber S2.Specifically, first chamber S1 is used for encapsulated electrode component, and second chamber S2 is used to provide motion space for contact chip 12, and first chamber S1 and second chamber S2 is separated by contact chip 12.When the internal pressure of first chamber S1 is more than reference pressure, gas pressure acts on contact chip 12, and pushes its movement.
Contact chip 12 after movement can be realized with conductive sheet 22 to be in electrical contact, wherein conductive sheet 22 is located at side of the coping plate 41 far from electrode assembly.Conductive sheet 22 can be entirely located in the inside of second chamber S2, can also be entirely located in the outside of second chamber S2.When conductive sheet 22 is entirely located in the outside of second chamber S2, the heat that contact chip 12 and conductive sheet 22 generate when being in electrical contact can more easily be dispersed by conduction.
In the embodiment shown in Figure 2, a part of conductive sheet 22 is arranged in second chamber S2, and rest part is located at outside second chamber S2, this scheme is taken into account convenient for heat dissipation and is easy to implement the electrical contact these two aspects with contact chip 12 and is arranged.
Specifically, as shown in Figs. 1-2, contact chip 12 attaches on first terminal 11, and conductive sheet 22 is arranged in the top of coping plate 41 and connect with Second terminal 21, conductive sheet 22 extends from Second terminal 21 towards the side of first terminal 11, offers through-hole on coping plate 41
413, conductive sheet 22 has the protrusion part for being convex to contact chip 12, the protrusion part is the contact portion 221 being in electrical contact with the contact chip 12 after movement, the contact portion 221 protrudes into through-hole 413 and is located in second chamber S2, the setting of contact portion 221 facilitates the setting being spaced between the heat dissipation and conductive sheet 22 and contact chip 12 of conductive sheet 22, this interval enable contact with each other between the two when contact chip 12 acts, being capable of mutually insulated before the movement of contact chip 12.
Further, according to one embodiment, as shown in Figure 3-4, contact chip 12 includes plush copper 121 and turning part 122, wherein turning part 122 is sheet annuli arrangement, this is conducive to the realization under gas pressure of contact chip 12 and acts, plush copper 121 is connected to turning part 122 and protrudes towards the side of coping plate 41, and when contact chip 12 acts, contact chip 12 can be contacted by plush copper 121 with contact portion 221.In the program, the setting of plush copper 121 can improve the safety of secondary cell between contact portion 221 there are the actuating length for reducing contact chip 12 on the basis of appropriate intervals.Further, plush copper 121 and turning part 122 can be an integral structure.
And further, as shown in figure 5, contact portion 221 has the first contact plane 221a, correspondingly, plush copper 121 has the second contact plane 121a, and when contact chip 12 is contacted with conductive sheet 22, the first contact plane 221a and the second contact plane 121a are in electrical contact.There is biggish contact area when this scheme can make contact chip 12 and conductive sheet 22 contact, it is reliable in electrical contact between the two to guarantee.
For conductive sheet 22, conductive sheet 22 is fixed, and contact portion 221 is towards a side surface of contact chip 12 as the first contact plane 221a.For contact chip 12, contact chip 12 can deform after acting, it is contemplated that the deflection at plush copper 121 is relatively small, and a side surface of the plush copper 121 towards conductive sheet 22 keeps flat state substantially, therefore, the surface of plush copper 121 towards the conductive sheet 22 can be used as the second contact plane 121a.
In the embodiment shown in Fig. 1-2, one end of conductive sheet 22 is connected at Second terminal 21, the other end extends towards the side of first terminal 11, therefore, conductive sheet 22 is the cantilever design that one end is fixed, the other end is free end, during being contacted with contact chip 12, it will lead to conductive sheet 22 and generate displacement under the action of contact force, cause the two poor contact.In order to overcome drawbacks described above, connection structure preferably can be set in the free end of conductive sheet 22, the free end of conductive sheet 22 is fixed, which can be realized by the structure of bonding,
It can also be realized by mutually matched snap-in structure.
As shown in Figure 2, it include insulating component 23 in secondary cell, insulating component 23 is coated on the outside of conductive sheet 22, and one end is fixed at Second terminal 21, on the one hand, by the cladding of insulating component 23, so that the two is embedded together, insulating component 23 is extended and possibly fixed at first terminal 11 towards first terminal 11, after such setting, by the support of insulating component 23, so that the cantilever design of conductive sheet 22 is eased, the phenomenon that conductive sheet 22 is with 12 poor contact of contact chip is reduced.
On the other hand, the contact portion 221 contacted with contact chip 12 is only exposed by the cladding of insulating component 23, on conductive sheet 22, and realizes the part being electrically connected with Second terminal 21, the conducting with coping plate 41 is avoided with this, while realizing the insulation of conductive sheet 22 Yu coping plate 41.
It is insulated between Second terminal 21 and coping plate 41 by the second insulating cell 27.Wherein, insulating materials can select rubber, asbestos etc..
And correspondingly, as shown in Figure 1, being also provided with the hole 231 passed through for resistive elements 24 on insulating component 23, to realize the conducting of resistive elements 24 and coping plate 41 and first end daughter board 15.
As shown in Figure 3-4, first terminal 11 includes the terminal body 111 being connected and extension 112, extension 112 extends towards the side of Second terminal 21, opening 112a is offered on extension 112, the outer edge of turning part 122 is sealedly connected on extension 112, so that 12 sealed opening 112a of contact chip, and first chamber S1 and second chamber S2 are separated, 413 face of through-hole on this opening 112a and coping plate 41, the intermediate position of turning part 122 is arranged in plush copper 121, in this way, when contact chip 12 acts, plush copper 121 is contacted via opening 112a and through-hole 413 with contact portion 221.Wherein, for realizing that the part being electrically connected is located at terminal body 111 with pole piece and external circuit, extension 112 facilitates setting of the contact chip 12 on first terminal 11 for connecting with contact chip 12.
In the embodiment shown in Fig. 3-4, terminal body 111 is an integral structure with extension 112, however, it is desirable to explanation, in some other embodiment, terminal body 111 can also be adopted a split structure with extension 112, and the application is not construed as limiting this.
As shown in Figure 3-4, column 112b is extended with to the side close to coping plate 41 on extension 112, column 112b has along its axially extending cavity, and the cavity is through prolonging
Extending portion 112, opening 112a are formed in the cavity.The inner wall of column 112b is hierarchic structure, the hierarchic structure forms cascaded surface 112c on the inner wall of column 112b, cascaded surface 112c is bonded positioning with the outer peripheral surface of turning part 122, after the two location fit can by way of butt welding or bonding etc. modes are fixed is tightly connected with realizing.
In addition, the internal pressure in order to guarantee 12 quick response secondary cell of contact chip, secondary cell further includes the containment member 13 being sealed between first chamber S1 and second chamber S2.According to one embodiment, as shown in Fig. 2, containment member 13 is sealedly attached between extension 112 and coping plate 41, and containment member 13 has the primary sealing area 131 in sealing contact with coping plate 41 and the secondary sealing area 132 in sealing contact with extension 112.
Specifically, containment member 13 is ring structure, containment member 13 is sleeved on outside column 112b, column 112b is embedded in through-hole 413 together with containment member 13, containment member 13 and the inner wall of through-hole 413 and the outer wall of column 112b are in sealing contact, so that containment member 13 forms the primary sealing area 131 and secondary sealing area 132 being oppositely arranged along the extending direction of coping plate 41.
Furthermore, as shown in Figure 6, containment member 13 can also form the primary sealing area 131 and secondary sealing area 132 being oppositely arranged along the short transverse of secondary cell when containment member 13 is in sealing contact with coping plate 41 and extension 112 respectively around through-hole 413 and opening 112a setting.
In some other embodiment, as shown in Figure 7, containment member 13 can also be sealedly attached between contact chip 12 and coping plate 41, and containment member 13 has the primary sealing area 131 in sealing contact with coping plate 41 and the secondary sealing area 132 in sealing contact with contact chip 12, also, short transverse of the primary sealing area 131 with secondary sealing area 132 along secondary cell is oppositely arranged.
In the embodiment shown in fig. 7, as long as to the 12 above-mentioned three slightly modification of coping plate 41, extension 112 and contact chip, it is also possible that extending direction of the primary sealing area 131 with secondary sealing area 132 along coping plate 41 is oppositely arranged, the principle of this sealing structure and the principle of sealing structure shown in Figure 2 are essentially identical, and details are not described herein again.
In addition, this scheme can reduce the usage quantity of components in secondary cell as shown in figure 8, can also serve as containment member 13 using the plastic parts being arranged between first terminal 11 and coping plate 41, simplify assembly technology.
As shown in Figure 2, the space of the second chamber S2 formed after being closed due to shell and the lid of coping plate 41 is limited, therefore, the motion space of contact chip 12 is restricted, in order to increase this space, preferably coping plate 41 includes body part 411 and bump 412, and the side that bump 412 is directed away from shell is prominent, so that second chamber S2 is surrounded by contact chip 12 and bump 412, and through-hole 413 is arranged on bump 412.So, the space of second chamber S2 is extended, and the meaning after this spatial spread is, when contact chip 12 acts, the air compression ratio in the space reduces, and resistance when contact chip 12 acts reduces, and is conducive to improve sensitivity when contact chip 12 acts.
The application further includes fusible member 14, as shown in Figure 1, fusible member 14 is series in the electrical communication path by the first pole piece, first terminal 11, contact chip 12, conductive sheet 22, Second terminal 21 and the second pole piece, also, the area of passage of fusible member 14 be less than electrical communication path at the rest of area of passage.Wherein, fusible member 14 can be series between the first pole piece and first terminal 11, or, fusible member 14 can be series between the second pole piece and Second terminal 21, or, fusible member 14 is set as two, and one of them is series between the first pole piece and first terminal 11, and another one is series between the second pole piece and Second terminal 21.By the setting of fusible member 14, enable and fuse at fusible member 14 when passing through Short-Circuit High Current in the electrical communication path, to realize risk breaking between electrode assembly 31 and external circuit, to reduce secondary cell kindling and explode.
Fusible member 14 can be separately provided, and can also be wholely set with other parts.It in the embodiment shown in fig. 1, include the first connector 16 and the second connector 26 in secondary cell, the first connector 16 is connected between the first pole piece and first terminal 11, and the second connector 26 is connected between the second pole piece and Second terminal 21.Wherein, fusible member 14 is formed at least one of both first connector 16 and the second connector 26.When secondary cell in normal operation, first connector 16 can be used as the electrical connector of connection the first pole piece and first terminal 11, electrical connector of second connector 26 as connection the second pole piece and Second terminal 21, the assembly process process for being conducive to improve secondary cell avoids the deformation that the first tab 311 and the second tab 312 are caused in assembling process.However, the fusible member 14 for being formed in the first connector 16 or the second connector 26 can play fusing effect, and cutting forms the circuit for passing through the first pole piece and the second pole piece when short-circuit between the first pole piece and the second pole piece.
Fusible member 14 can be real by way of opening up notch, hole on the first connector 16
It is existing so that formed on the first connector 16 area of passage be less than at the rest of area of passage, be at the place of fusible member 14 at this lesser area of passage.
Similarly, the mode for fusible member 14 being formed on the second connector 26 can using the above structure, and details are not described herein again.
It needs to illustrate, fusible member 14 and resistive elements 24 can be series at simultaneously in the electrical communication path by the first pole piece, first terminal 11, contact chip 12, conductive sheet 22, Second terminal 21 and the second pole piece, resistive elements 24 can reduce the short circuit current of contact chip 12 Yu 22 Contact of conductive sheet, but the short circuit current after reducing is enough to fuse fusible member 14, so that the electrical communication path is breaking.
It is above positive terminal only for first terminal 11, Second terminal 21 is that this way of example of negative terminal is illustrated, still, the application is not limited only to the above embodiments, for example, it is also possible to which first terminal 11 is used as negative terminal, correspondingly, Second terminal 21 is used as positive terminal etc..
Also, it will be appreciated by those skilled in the art that the difference of position is arranged according to contact chip 12 and conduct piece 22, correspondingly, a variety of corresponding variant schemes are can be obtained in the structure of each component and set-up mode in secondary cell.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, and for those skilled in the art, various changes and changes are possible in this application.Within the spirit and principles of this application, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this application.
Claims (16)
- A kind of secondary cell, comprising: electrode assembly, first terminal, Second terminal and coping plate, which is characterized in thatThe electrode assembly includes the first pole piece, the second pole piece and the partition being arranged between first pole piece and second pole piece, and first pole piece is electrically connected with the first terminal, and second pole piece is electrically connected with the Second terminal,The secondary cell further include: resistive elements, the conductive sheet for attaching to the contact chip of the first terminal and being electrically connected with the Second terminal,The coping plate is electrically connected with the first terminal always by the resistive elements, with the Second terminal and the conductive sheet insulation set；When the internal pressure of the secondary cell is more than reference pressure, the contact chip is acted under gas pressure and is contacted with the conductive sheet, to form the electrical communication path by first pole piece, the first terminal, the contact chip, the conductive sheet, the Second terminal and second pole piece.
- Secondary cell according to claim 1, which is characterized in that it further include shell, the coping plate and the case lid close the first chamber to be formed for encapsulating the electrode assembly and provide the second chamber of motion space for the contact chip,The first chamber is separated with the second chamber by the contact chip, and the conductive sheet is located at the side far from the electrode assembly of the coping plate.
- Secondary cell according to claim 2, which is characterized in that the coping plate is equipped with through-hole, and the conductive sheet has the contact portion that can be contacted with the contact chip after movement, and the contact portion is located in the second chamber.
- Secondary cell according to claim 3, it is characterized in that, the coping plate includes body part and bump, the side that the bump is directed away from the shell is prominent, the second chamber is surrounded by the contact chip and the bump, and the through-hole is arranged on the bump.
- Secondary cell according to claim 3, which is characterized in that the first terminal includes the terminal body being connected and extension,Opening, through-hole described in the opening face, the contact chip are offered on the extension The opening is sealed, the first chamber and the second chamber are separated.
- Secondary cell according to claim 5, which is characterized in that the terminal body is an integral structure with the extension or split type structure.
- Secondary cell according to claim 5, it is characterized in that, it further include the containment member being sealed between the first chamber and the second chamber, the containment member is sealedly attached between the extension and the coping plate, and has the primary sealing area in sealing contact with the coping plate and the secondary sealing area in sealing contact with the extension.
- Secondary cell according to claim 2, it is characterized in that, it further include the containment member being sealed between the first chamber and the second chamber, the containment member is sealed between the contact chip and the coping plate, and has the primary sealing area in sealing contact with the coping plate and the secondary sealing area in sealing contact with the contact chip.
- Secondary cell according to claim 7 or 8, which is characterized in that extending direction of the primary sealing area with the secondary sealing area along the coping plate is oppositely arranged, and/orShort transverse of the primary sealing area with the secondary sealing area along the secondary cell is oppositely arranged.
- Secondary cell according to claim 5, which is characterized in that the contact chip includes turning part and plush copper,Turning part is sheet annuli arrangement,The plush copper is connected to turning part, and protrudes towards the side of the coping plate,The outer edge of turning part and the extension are tightly connected, and can be contacted by the plush copper with the contact portion when contact chip movement.
- Secondary cell according to claim 1, which is characterized in that further include first end daughter board, the first terminal is electrically connected with the first end daughter board, and the resistive elements are series between the first end daughter board and the coping plate.
- Secondary cell according to claim 11, which is characterized in that the resistive elements have a first end and a second end,The first recess portion is offered on the coping plate, the first end is embedded in first recess portion,And/orThe second recess portion is offered on the first end daughter board, the second end is embedded in second recess portion.
- Secondary cell according to claim 1, which is characterized in that the range of the resistance value of the resistive elements is 2 ohm~200000 ohm.
- According to claim 1-8, secondary cell described in any one of 10-13, it is characterized in that, it further include fusible member, the fusible member is series at the area of passage in the electrical communication path by first pole piece, the first terminal, the contact chip, the conductive sheet, the Second terminal and second pole piece, at the fusible member less than area of passage at the rest of in the electrical communication path；AndThe fusible member is series between first pole piece and the first terminal, and/orThe fusible member is series between second pole piece and the Second terminal.
- Secondary cell according to claim 14, which is characterized in that it further include the first connector and the second connector,First pole piece is electrically connected by first connector with the first terminal, and second pole piece is electrically connected by second connector with the Second terminal,The fusible member is formed on first connector and/or second connector.
- Secondary cell according to claim 15, which is characterized in that the fusible member is by opening up notch on the first connector and/or on the second connector and/or hole is formed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/105865 WO2018090179A1 (en) | 2016-11-15 | 2016-11-15 | Secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109792031A true CN109792031A (en) | 2019-05-21 |
| CN109792031B CN109792031B (en) | 2022-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680088924.9A Active CN109792031B (en) | 2016-11-15 | 2016-11-15 | Secondary battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109792031B (en) |
| WO (1) | WO2018090179A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904033A (en) * | 2021-09-16 | 2022-01-07 | 宁德新能源科技有限公司 | Battery cell and electric equipment |
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| CN102487135A (en) * | 2010-12-02 | 2012-06-06 | Sb锂摩托有限公司 | Rechargeable battery |
| CN102738522A (en) * | 2011-03-30 | 2012-10-17 | Sb锂摩托有限公司 | Secondary battery |
| CN204668368U (en) * | 2015-06-11 | 2015-09-23 | 宁德时代新能源科技有限公司 | Top cover structure of power battery and electrokinetic cell |
| CN205542938U (en) * | 2016-04-26 | 2016-08-31 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap and secondary cell |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9634299B2 (en) * | 2011-09-06 | 2017-04-25 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| JP2014099347A (en) * | 2012-11-15 | 2014-05-29 | Toyota Industries Corp | Power storage device |
| US20140227567A1 (en) * | 2013-02-14 | 2014-08-14 | Samsung Sdi Co., Ltd. | Battery module |
| CN204614848U (en) * | 2015-05-11 | 2015-09-02 | 宁德时代新能源科技有限公司 | Lithium ion battery external short circuit jockey |
| CN205657097U (en) * | 2016-05-20 | 2016-10-19 | 宁德时代新能源科技股份有限公司 | Secondary cell safety top cap |
| CN105932181B (en) * | 2016-07-15 | 2018-09-28 | 东莞永蓝电子科技有限公司 | A kind of power battery head cover and the power battery using the head cover |
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2016
- 2016-11-15 CN CN201680088924.9A patent/CN109792031B/en active Active
- 2016-11-15 WO PCT/CN2016/105865 patent/WO2018090179A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487135A (en) * | 2010-12-02 | 2012-06-06 | Sb锂摩托有限公司 | Rechargeable battery |
| CN102738522A (en) * | 2011-03-30 | 2012-10-17 | Sb锂摩托有限公司 | Secondary battery |
| CN204668368U (en) * | 2015-06-11 | 2015-09-23 | 宁德时代新能源科技有限公司 | Top cover structure of power battery and electrokinetic cell |
| CN205542938U (en) * | 2016-04-26 | 2016-08-31 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap and secondary cell |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018090179A1 (en) | 2018-05-24 |
| CN109792031B (en) | 2022-04-01 |
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