CN109817853A - Secondary cell's top cap subassembly and secondary cell - Google Patents
Secondary cell's top cap subassembly and secondary cell Download PDFInfo
- Publication number
- CN109817853A CN109817853A CN201711164736.2A CN201711164736A CN109817853A CN 109817853 A CN109817853 A CN 109817853A CN 201711164736 A CN201711164736 A CN 201711164736A CN 109817853 A CN109817853 A CN 109817853A
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- China
- Prior art keywords
- lamina tecti
- secondary cell
- sealing
- air hole
- cap assembly
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a secondary battery and a top cover assembly thereof. The cap assembly of the secondary battery includes: a top cover plate having an air hole; a first electrode terminal insulated from the top cap plate; a second electrode terminal electrically connected to the top cover plate; a conductive member electrically connected to the first electrode terminal and insulated from the top cover plate; an inversion sheet attached to the top cover plate and configured to invert in response to an increase in internal pressure of the secondary battery to electrically connect the inversion sheet with the conductive member; and a sealing plug sealing the vent hole and having a lower melting point than the top cover plate, the sealing plug being configured to deform in response to an increase in an ambient temperature in which the secondary battery is located to escape from a sealed state with the vent hole. The problem of overcharge of the secondary battery under the normal temperature condition can be solved, simultaneously the gas that can also in time produce the secondary battery under high temperature environment is discharged, avoids taking place the short circuit in the positive plate and the negative pole piece of secondary battery in high temperature environment to accidents such as electrode subassembly explosion cause.
Description
Technical field
The present invention relates to energy storage device technical field more particularly to the cap assemblies and secondary electricity of a kind of secondary cell
Pond.
Background technique
New-energy automobile is at home or even the world is all being widely popularized, but wants complete replacing fuel oil automobile, and there are also very much
Need improvements.The problems such as example, mileage travelled of automobile is few, battery pack is at high cost, the reliability of battery pack also need into
One step solves.Based on above-mentioned problem, to the core part secondary cell of electric vehicle, more stringent requirements are proposed, such as needs two
Primary cell reaches higher energy density, lower cost etc..
Secondary cell is different from one-shot battery and is that it can be repeated charging and discharging, and be not designed to can by the latter
It is recharged.But heat and gas can be sharply generated when secondary cell overcharges, and then secondary cell may be caused to catch fire
Or the security risks such as explosion.Therefore, in order to prevent secondary cell due to overcharging when cause to catch fire and explode, can be using secondary
Shorting members are set on the cap assembly of battery.Shorting members include being connected to the connecting plate of negative electrode terminal and being connected to top
Cover board is attached to lamina tecti and can be responded the pressure of enclosure interior with the rotating sheet with connecting plate holding discrete state, the rotating sheet
Power increases and deforms, to overturn and connect plate, since lamina tecti and rotating sheet are attached to positive electrode terminal, because
The positive plate of shell inner electrode assembly and negative electrode tab can be carried out short circuit by short-circuit part by this.
However, above-mentioned component can but reduce the ability of secondary cell reply hot environment, such as above-mentioned component in reply heat
When case (Hot-Box) is tested, the probability that thermal runaway occurs in secondary cell is greatly increased.Concrete reason are as follows: under high temperature environment, two
Not only air pressure inside can increase with the decomposition of electrolyte at high temperature in primary cell, but also the internal resistance of electrode assembly can also increase
Greatly；At this time if rotating sheet overturning makes the positive plate of secondary cell and negative electrode tab form external short circuit, electrode assembly can be due to it
The increase of internal resistance and the presence of short circuit current generate bigger heat, to aggravate the risk that secondary cell is on fire, explodes.It changes
Sentence is talked about, and existing external short circuit component can only solve the problems, such as overcharging for secondary cell when normal temperature condition, but in hot environment
Under will increase the probability of thermal runaway.
Therefore, the cap assembly and secondary cell of a kind of new secondary cell are needed.
Summary of the invention
According to an embodiment of the invention, providing the cap assembly and secondary cell of a kind of secondary cell, it is able to solve
Secondary cell overcharges problem, while the gas that will can also be generated inside secondary cell in time under high temperature environment under normal temperature condition
Body discharge avoids the positive plate of secondary cell in the high temperature environment and negative electrode tab that short circuit occurs.
According to an aspect of an embodiment of the present invention, a kind of cap assembly of secondary cell is provided, comprising: lamina tecti,
With air hole；First electrode terminal insulate with lamina tecti；Second electrode terminal, is electrically connected with lamina tecti；Conduct piece, with
The electrical connection of one electrode terminal is simultaneously insulated with lamina tecti；Rotating sheet, attaches to lamina tecti, and rotating sheet be configured to respond to it is secondary
The internal pressure of battery increases and overturns, so that rotating sheet is electrically connected with conduct piece；And sealing-plug, it seals air hole and has
There is the fusing point lower than lamina tecti, sealing-plug is configured to respond to the increase of secondary cell local environment temperature and deforms, to be detached from
With the sealing state of air hole.
According to an aspect of an embodiment of the present invention, the melting range of sealing-plug is 80 DEG C -200 DEG C.
According to an aspect of an embodiment of the present invention, sealing-plug includes body part, and body part covers air hole and and top cover
One side surface of plate is against cooperation.
According to an aspect of an embodiment of the present invention, sealing-plug further includes extension, and extension is connected to body part and stretches
Enter air hole.
According to an aspect of an embodiment of the present invention, sealing-plug further includes limiting section, and limiting section is connected to extension, and limits
The surface of position portion and the separate body part side of lamina tecti is against cooperation.
According to an aspect of an embodiment of the present invention, lamina tecti further includes the first heavy platform of annular, and the first heavy platform is around saturating
The circumference of stomata and radially extending along air hole, and body part is contained in the first heavy platform.
According to an aspect of an embodiment of the present invention, cap assembly further includes briquetting, and body part is in briquetting and lamina tecti
Between and contacted simultaneously with briquetting and lamina tecti, briquetting has through-hole, and sealing-plug is detached to be led to after the sealing state of air hole
Hole can be connected with the inside of secondary cell.
According to an aspect of an embodiment of the present invention, body part and briquetting are respectively positioned on the interior of the separate secondary cell of lamina tecti
The side in portion, through-hole are oppositely arranged with air hole.
According to an aspect of an embodiment of the present invention, lamina tecti further includes the second heavy platform of annular, and the second heavy platform is around the
The circumference of one heavy platform and radially extending along air hole, and briquetting is contained in the second heavy platform.
According to an aspect of an embodiment of the present invention, body part has the cricoid protrusion contacted with briquetting, and protrusion
Around through-hole；Alternatively, body part has the cricoid protrusion contacted with lamina tecti, and protruding ring is around air hole.
Other side according to an embodiment of the present invention additionally provides a kind of secondary cell, comprising: shell has opening；
Electrode assembly accommodates in the housing, including the first pole piece, the second pole piece and is arranged between the first pole piece and the second pole piece
Partition；With above-mentioned cap assembly, the opening of shell is covered, in the housing by electrode assembly closing.
To sum up, in the cap assembly and secondary cell of the secondary cell of the embodiment of the present invention, energy is provided on lamina tecti
The rotating sheet enough overturn in response to the pressure increase inside secondary cell, overturning can be passed through when secondary cell room temperature overcharges
Piece is by the electrode assembly short circuit inside secondary cell, to solve the problems, such as to overcharge.Meanwhile by the way that air hole is arranged on lamina tecti
And it is installed on the sealing-plug of air hole, and sealing-plug is configured to the increase in response to secondary cell local environment and deforms, it takes off
From the sealing state with air hole.Therefore, when carrying out hot tank test to secondary cell, under the influence of hot the temperature inside the box, sealing
Plug can deformation occurs before rotating sheet is not overturn, to open air hole, the gas inside secondary cell is discharged to two
Outside primary cell.Therefore, the cap assembly of the secondary cell of the embodiment of the present invention and secondary cell are not only able to solve room temperature
Under the conditions of secondary cell overcharge problem, while increase of the electrode assembly due to internal resistance can be avoided in hot tank test process
And the presence of short circuit current generates more heat transfer, and then the accidents such as generation is on fire, even explodes, and reduces secondary cell in height
Thermal runaway probability under warm environment, so that the ability of secondary cell reply hot environment greatly improved.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In:
By reading detailed description of non-limiting embodiments referring to the drawings, other feature of the invention,
Objects and advantages will become more apparent upon, wherein the same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is cross-section structure signal of the secondary cell according to an embodiment of the invention along longitudinal direction after cutting line cutting
Figure；
Fig. 2 is the decomposition texture schematic diagram of cap assembly according to an embodiment of the invention；
Fig. 3 is the overlooking structure diagram of the cap assembly in Fig. 2；
Fig. 4 is the schematic diagram of the section structure of the cap assembly of Fig. 3 after A-A cutting line cutting；
Fig. 5 is the partial structurtes enlarged diagram of the part A in the cap assembly of Fig. 4；
Fig. 6 is the partial structurtes enlarged diagram of the part B in the cap assembly of Fig. 4；
Fig. 7 is the structural schematic diagram at the cap assembly air hole in Fig. 6；
Fig. 8 is the schematic diagram of the section structure after the cutting along longitudinal direction of cap assembly according to a second embodiment of the present invention；
Fig. 9 is the partial structurtes enlarged diagram of the C portion in the cap assembly of Fig. 8；
Figure 10 is the structural schematic diagram at the cap assembly air hole in Fig. 9；
Figure 11 is the schematic diagram of the section structure after the cutting along longitudinal direction of cap assembly according to a third embodiment of the present invention；
Figure 12 is the partial structurtes enlarged diagram of the part D in the cap assembly of Figure 11；
Figure 13 is the schematic diagram of the section structure after the cutting along longitudinal direction of cap assembly according to a fourth embodiment of the present invention；
Figure 14 is the partial structurtes enlarged diagram of the part E in the cap assembly of Figure 13.
Description of symbols:
1- secondary cell；100- cap assembly；101- cap assembly；102- cap assembly；103- cap assembly；200- shell
Body；300- electrode assembly；400- terminal plate；
10- lamina tecti；11- electrode fairlead；12- through-hole；13- air hole；The first heavy platform of 131-；The second heavy platform of 132-；
The explosion-proof valve module of 14-；
20- terminal assemblies；21- pole；211- extension；22- electric connection board；221- through-hole；The coupling part 222-；223-
Contact portion；23- sealing element；24- separator；241- sinking portion；242- accommodation space；243- through-hole；244- through-hole；25- is turned over
Rotor；The bending part 251-；252- circumference edge portion；253- protrudes part；
30- terminal assemblies；31- pole；32- electric connection board；33- sealing element；34- separator；
The first insulated part of 41-；The second insulated part of 42-；
60- sealing-plug；61- body part；62- extension；63- limiting section；64- protrusion；
70- briquetting；71- through-hole.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.In attached drawing and following
Description in, at least part of known features and technology are not shown, unnecessary fuzzy to avoid causing the present invention；
Also, for clarity, may be exaggerated the size of part-structure.Identical appended drawing reference indicates same or similar knot in figure
Structure, thus the detailed description that them will be omitted.In addition, feature described below, structure or characteristic can be with any suitable
Mode be incorporated in one or more embodiments.
The noun of locality of middle appearance described below is direction shown in figure, is not the tool to cap assembly of the invention
Body structure is defined.In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be directly connected, can also be indirectly connected.For the ordinary skill in the art, visual specific
Situation understands the concrete meaning of above-mentioned term in the present invention.
The cap assembly of secondary cell provided in an embodiment of the present invention, the shell 200 that can be covered in secondary cell are open,
By electrode assembly and to be used to occur the electrolyte of electrochemical reaction and be sealed in shell 200, and realize electrode assembly and shell
The electrical connection of conductive component outside 200.Also, the cap assembly of the embodiment of the present invention can reduce secondary cell in high temperature ring
Thermal runaway probability under border, improves the ability of power battery reply hot environment, therefore is capable of the security reliability of secondary cell.
For a better understanding of the present invention, below with reference to the top of Fig. 1 to Figure 14 secondary cell according to an embodiment of the present invention
Cap assemblies and secondary cell are illustrated.
Fig. 1 is cross-section structure signal of the secondary cell 1 according to an embodiment of the invention along longitudinal direction after cutting line cutting
Figure.As shown in Figure 1, secondary cell 1 generallys include: cap assembly 100, shell 200 and the electrode group inside shell 200
Part 300 and terminal plate 400.
According to one embodiment of present invention, shell 200 can be made of metal material, such as aluminium, aluminium alloy or nickel plating
Steel, and in the present embodiment, shell 200 is formed the box-like of rectangle, and has opening, with by open communication inside it
Accommodation space.
Electrode assembly 300 can be formed and the first pole piece, the second pole piece and partition are stacked or wound together,
In, partition is the insulator between the first pole piece and the second pole piece.In the present embodiment, illustratively it is with the first pole piece
Negative electrode tab, the second pole piece are illustrated for positive plate.Similarly, in other examples, the first pole piece can also be anode
Piece, and the second pole piece is negative electrode tab.In addition, positive plate active material is applied on the coating area of positive plate, and negative electrode tab is living
Property substance is applied on the coating area of negative electrode tab.Pole is then used as by the uncoated part that the coating area of the first pole piece is extended
Ear, i.e. the first tab；Tab, i.e. the second tab are then used as by the uncoated part that the coating area of the second pole piece is extended.
Fig. 2 is the decomposition texture schematic diagram of cap assembly 100 according to an embodiment of the invention；Fig. 3 is the top in Fig. 2
The overlooking structure diagram of cap assemblies 100.Please also refer to Fig. 2 and Fig. 3, cap assembly 100 is used for seal casinghousing 200, can
Electrode assembly 300 is sealed in shell 200.According to one embodiment of present invention, cap assembly 100 generallys include lamina tecti
10, terminal assemblies 20, terminal assemblies 30 and lower part insulation system.
Lamina tecti 10 is in size and shape that are lamellar, and matching with the opening with shell 200, so as to connect
In the opening of shell 200.Lamina tecti 10 is made of metal material, and illustratively, lamina tecti 10 can choose and shell 200
The identical metal material of material, such as: the materials such as aluminium, steel.In the present embodiment, there are two electrodes to draw for setting on lamina tecti 10
Hole 11, through-hole 12, air hole 13 and explosion-proof valve module 14.
Explosion-proof valve module 14 can be using existing structure (such as by the way of setting explosion rupture disk), and explosion-proof valve module 14 is set to
The approximately mid way between of lamina tecti 10, when due to overcharging, over-discharge or battery overheat and generating gas makes secondary cell 1
Internal pressure it is excessive when, the explosion rupture disk in explosion-proof valve module 14 can be corrupted such that the gas being formed in inside secondary cell 1
Body can be discharged into outside, and thus, it is possible to prevent secondary cell 1 from exploding.
Fig. 4 is the schematic diagram of the section structure of the cap assembly 100 of Fig. 3 after A-A cutting line cutting；Fig. 5 is the top cover of Fig. 4
The partial structurtes enlarged diagram of part A in component 100.Please also refer to Fig. 2 to Fig. 5, exemplary reality according to the present invention
Apply example, on lamina tecti 10 setting there are two electrode fairlead 11, for respectively for terminal assemblies 20 and terminal assemblies 30 respectively in
Electrode terminal the electric energy in the electrode assembly 300 inside shell 200 is drawn out to the outside of secondary cell 1.
In one exemplary embodiment, terminal assemblies 20 generally include first electrode terminal, sealing element 23 and isolation
Part 24；Similarly, terminal assemblies 30 generally include second electrode terminal, sealing element 33 and separator 34.Below only specifically with end
The structure of sub-component 20 itself and its illustratively illustrated for the installation form on lamina tecti 10.Also, do not having
It is illustratively the terminal assemblies of cathode with terminal assemblies 20 in the case where specified otherwise, and terminal assemblies 30 are the end of anode
The mode of sub-component is illustrated.
According to one embodiment of present invention, first electrode terminal generally includes three parts: for realizing with secondary electricity
Outside pond 1 component (such as busbar connector) electrical connection external connection part, for realizing the connection being fixedly connected with lamina tecti 10
The first tab realization of part and the electrode assembly 300 being used in battery (i.e. secondary cell 1) inside with shell 200 is electrically connected
The internal wiring part connect.In the present embodiment, specifically, first electrode terminal includes pole 21 and electric connection board 22, wherein pole
Column 21 includes being electrically connected as the pole ontology for the coupling part being fixedly connected with lamina tecti 10 and as with the realization of the first tab
Internal wiring part extension 211, and electric connection board 22 is then as the external connection part connecting with busbar connector.
Illustratively, in the present embodiment, pole ontology can be copper or Copper alloy material and be cylindrical structure, pole
The diameter of column ontology and the aperture of electrode fairlead 11 are adapted, and extension 211 is then the plate body connecting with pole ontology.Show
Example property, pole ontology can be arranged with extension 211 using integrally formed mode, and the cross section of extension 211
Area is greater than the area of the cross section of pole ontology.
Illustratively, in the present embodiment, electric connection board 22 includes: coupling part 222 and contact portion 223, certainly,
It is preferred that coupling part 222 and contact portion 223 form electric connection board 22, and coupling part 222 using integrally formed mode
Plate-like with contact portion 223 and be configured to step-like structure, i.e., the thickness of coupling part 222 is greater than contact portion
223 thickness.The approximate centre position of coupling part 222 is provided with through-hole 221, and the aperture of through-hole 221 and pole 21
The diameter of pole ontology is adapted.
When installing first electrode terminal to lamina tecti 10, electric connection board 22 need to be fixed on lamina tecti 10 far from two
Side inside primary cell 1, pole 21 then stretches out inside secondary cell 1 to be connect with electric connection board 22.According to the present invention one
A embodiment, the peripheral surface of electric connection board 22 are at least partly isolated the encirclement of part 24, will be electrically connected by separator 24
Plate 22 with lamina tecti 10 is insulated separates.
Separator 24 is hard plastic part, illustratively, can be made of high-temperature insulation plastic material, such as be isolated
Part 24 can be made of one of polyphenylene thioether PPS, perfluoroalkoxy resin PEA or polypropylene PP or multiple material.Tool
Body, the main body of separator 24 is plate-like, and the edge of the main body is provided with collar flange, in the side shape of main body
At sinking portion 241, the coupling part 222 of the corresponding electric connection board 22 of separator 24 and contact portion 223 are respectively provided with the first isolation
Region and the second area of isolation, and the second area of isolation is provided with baffle, and baffle is connected to the top surface of collar flange, to pass through
The baffle and sinking portion 241 are in the second area of isolation side of separator 24 formation accommodation space 242.The main body of separator 24 has
There are the through-hole 244 positioned at the through-hole 243 of the first area of isolation and positioned at the second area of isolation, and the position of through-hole 243 and electricity
Pole fairlead 11 is corresponding, and the position of through-hole 244 is corresponding with through-hole 12.
After electric connection board 22 is fixed on separator 24, coupling part 222 is located at the first area of isolation of separator 24, and
Contact portion 223 is located at the second area of isolation of separator 24, that is to say, that the top end face of coupling part 222 is via separator
24 open section is to exposing outside, and contact portion 223 is whole is embedded in accommodation space 242.Electric connection board 22 and separator
24 be fixed to one another it is latter be placed in lamina tecti 10 away from 1 interior side of secondary cell, press from both sides the main part of separator 24
Between electric connection board 22 and lamina tecti 10.And the through-hole 221 of electric connection board 22, the through-hole 243 of separator 24 and electrode
Fairlead 11 is to just, and the through-hole 12 of the through-hole 244 of separator 24 and lamina tecti 10 is being each other to just, so that 223 energy of contact portion
It is enough to be exposed to inside shell 200 via through-hole 244 and through-hole 12.Certainly, separator 24 can use the side of integrated injection molding
Formula is formed between electric connection board 22 and lamina tecti 10；Or separator 24 is individually produced, and is filled with electric connection board 22
Match.
Further, the pole ontology of pole 21 from lamina tecti 10 towards 1 side of secondary cell via electrode fairlead
11 stretch out towards the external of secondary cell 1, and extension 211 can be resisted against lamina tecti 10 towards 1 side of secondary cell, from
And pole 21 is limited.Pole ontology then extends further into after being stretched out by lamina tecti 10 to the through-hole 221 of electric connection board 22
In, so as to by pole 21 and 22 riveting of electric connection board, so that first electrode terminal is fixed on lamina tecti 10.
Certainly, the structure of terminal assemblies 30 is similar to terminal assemblies 20, and the second electrode terminal of terminal assemblies 30 is also the same
Including pole 31 and the electric connection board being connected between pole 31 and the busbar connector of battery modules 32, certainly due to second electrode
The area of electric connection board 32 in terminal is smaller, so the ruler for the separator 34 being folded between electric connection board 32 and lamina tecti 10
Very little smaller, and in the present embodiment, the separator 34 in terminal assemblies 30 is not insulating materials, therefore pole 31 and top yet
Status of electrically connecting is remained between cover board 10.
In addition, the leakproofness in order to guarantee electrode fairlead 11, sealing element 23 are set between pole 21 and lamina tecti 10.
Sealing element 23 includes axial continuation and radially extending portion, wherein axial continuation is located in lamina tecti 10 and pole
Between ontology, and radially extending portion is located between lamina tecti 10 and extension 211, thus sealing element 23 respectively with lamina tecti
10 and pole 21 be in close contact, so as to guarantee the air-tightness of secondary cell 1.
Terminal plate 400 is located inside shell 200, and there are two terminal plate 400, two terminal plates 400 to distinguish for the tool of secondary cell 1
Corresponding first pole piece and the setting of the second pole piece, and be connected between first electrode terminal and the first pole piece and the second electricity
Between extreme son and the second pole piece.That is, two terminal plates 400 are respectively used to realize first electrode terminal and the first tab
Between electrical connection and second electrode terminal and the second tab between electrical connection.
In addition, in order to keep exhausted between the electrode assembly 300 and terminal plate 400 inside lamina tecti 10 and shell 200
Edge state, lower part insulation system generally use plastic material and are made.An exemplary embodiment according to the present invention, lower part insulation
Structure includes the first insulated part 41 and the second insulated part 42, wherein the first insulated part 41 is attached at the court of lamina tecti 10
To 200 interior side of shell, and it is corresponding with terminal assemblies 20.And the second insulated part 42 be attached at lamina tecti 10 towards shell
200 interior side of body, and it is corresponding with terminal assemblies 30.In addition, the first insulated part 41 and the second insulated part 42 difference
With through-hole corresponding with the electrode fairlead 11 of two sides, to realize that the electric energy of electrode assembly 300 is drawn.
In order to avoid in pressure rise, secondary cell 1 repeats charge and discharge and on fire and explosion occurs, in first electrode terminal
Rotating sheet 25 is additionally provided between second electrode terminal, and pressure of the rotating sheet 25 inside 1 shell 200 of secondary cell is super
(be more than reference pressure) overturning is electrically connected with electric connection board 22 when crossing predetermined value, so as in time by the of secondary cell 1
One pole piece and the short circuit of the second pole piece.
Specifically, rotating sheet 25 attaches to lamina tecti 10, and rotating sheet 25 has the bending part 251 of diaphragm type, circumferential edge
Edge point 252 and protrusion part 253, wherein bending part 251 is configured to the circle towards 200 inner space of shell protrusion
Arc；Circumference edge portion 252 is formed in the outside of bending part 251.The through-hole 12 opened up on lamina tecti 10 has heavy platform structure,
It is possible thereby to which the circumference edge portion 252 by rotating sheet 25 is welded to connect at the heavy platform that through-hole 12 has, thus by rotating sheet
25 are electrically connected to lamina tecti 10；Protrude part 253 from the approximate centre position of bending part 251 to shell 200 outside protrude.
Therefore, be connected at through-hole 12 can be via the through-hole 244 of separator 24 and connecing for electric connection board 22 for rotating sheet 25
Contact portion point 223 is opposite and keeps discrete state.Meanwhile the surface away from 22 side of electric connection board of rotating sheet 25 is exposed to shell
Inside 200, so that the gas generated inside shell 200 can be circulated to rapidly the lower surface of rotating sheet 25.And rotating sheet 25
It is configured as, when pressure rise inside shell 200, the bending part 251 of rotating sheet 25 can overturn and change into direction
Direction bending outside shell 200, to contact and be electrically connected with the contact portion 223 exposed from the through-hole 244 of separator 24.
Since rotating sheet 25 can be electrically connected to second electrode terminal by lamina tecti 10, so the material of rotating sheet 25 and lamina tecti 10
Material parent metal having the same.
Pressure rise inside the shell 200 of secondary cell 1 (such as when more than predetermined pressure threshold) as a result, overturning
Piece 25 can deform, i.e. the bending part 251 of rotating sheet 25 is directed away from the direction overturning of 200 inner space of shell, make
The protrusion part 253 obtained thereon is electrically connected with the formation of electric connection board 22, to make first electrode terminal (i.e. pole 21 and electrical connection
Plate 22), rotating sheet 25, lamina tecti 10 and second electrode terminal (i.e. pole 31 and electric connection board 32) be successively switched on, also
It is to say that the first pole piece and the second pole piece are short-circuited, and connect by electric connection board 22 with rotating sheet 25 and maintain this short-circuit shape
State.And when since short circuit occurs, moment (or substantially moment) can generate very big between the first pole piece and the second pole piece
Electric current, therefore electrode assembly 300 is discharged.
Therefore, electric connection board 22 is used as conduct piece in the present embodiment, when 1 internal pressure of secondary cell is more than predetermined threshold
It is electrically connected to pole 21 for the rotating sheet 25 after overturning afterwards, but the embodiment of the present invention is not limited to this, and is implemented in others
Example in, can also be arranged on lamina tecti 10 others conduct pieces, and be electrically connected conduct piece with first electrode terminal and with top
Cover board insulation, to realize being electrically connected between rotating sheet 25 and pole 21.
It is outer due to secondary cell 1 when secondary cell 1 carries out hot tank test (such as in 130 DEG C of held for some time)
Boundary's temperature is higher, internal chemical reaction acutely also can big volume production gas, the air pressure inside secondary cell 1, which increases to, to be enough to make to turn over
When rotor 25 is overturn, then it can aggravate the risk that explosion on fire occurs for secondary cell 1.In the embodiment of the present invention, cap assembly
100 air holes 13 including being set on lamina tecti 10, and the sealing-plug 60 being installed at air hole 13, it is close by sealing-plug 60
Air hole 13 is sealed, and sealing-plug 60 is configured to respond to the increase of 1 local environment temperature of secondary cell and is deformed, in rotating sheet
It is detached from the sealing state with air hole 13 before 25 overturnings, the gas in shell 200 is enable to be discharged via air hole 13, thus
It can reduce the risk that thermal runaway occurs for secondary cell 1.
Fig. 6 is the partial structurtes enlarged diagram of the part B in the cap assembly 100 of Fig. 4；Fig. 7 is the top cover group in Fig. 6
Structural schematic diagram at 100 air hole 13 of part.It is according to one embodiment of present invention, close as shown in Fig. 2, Fig. 4, Fig. 6 and Fig. 7
Blocking 60 includes three parts, and sealing-plug 60 limits cooperation with two sides of lamina tecti 10 respectively simultaneously, is fixed on ventilative
It is sealed at hole 13 and to air hole 13, to guarantee the normal use of secondary cell 1.
Specifically, the air hole 13 being arranged on lamina tecti 10 is close to 20 side of terminal assemblies, but for air hole 13
It in setting position the embodiment of the present invention and is not limited, in other examples, air hole 13, which can also be arranged in, to be pushed up
At the other positions of cover board 10.Specifically, in the present embodiment, lamina tecti 10 further includes the first heavy platform 131.First heavy platform 131
In a ring, be formed in lamina tecti 10 deviates from 1 interior side of secondary cell, and is centered around the circumference of air hole 13, that is to say, that
First heavy platform 131 is the annular recess radially extended to form from the periphery of air hole 13 to the direction far from air hole 13.When
So it should be noted that opening up depth and extending area for the first heavy platform 131 needs not influence the structural strength of lamina tecti 10.
Specifically, in the present embodiment, being installed on the sealing-plug 60 at air hole 13 has the fusing point lower than lamina tecti 10,
Such as the material of sealing-plug 60 can be PP (polypropylene, polypropylene), PE (polyethylene, polyethylene) etc..Show
Example property, the melting range of sealing-plug 60 can be 80 DEG C to 200 DEG C.When local environment temperature is more than the fusing point of sealing-plug 60
Afterwards, sealing-plug 60 can then deform, i.e., hair fusing or ruckbildung, then at this time sealing-plug 60 can then be detached from it is close with air hole 13
Envelope state, so that air hole 13 be made to be opened, the gas inside secondary cell 1 then can be expelled to outside by air hole 13.
In the present embodiment, sealing-plug 60 includes: body part 61, extension 62 and limiting section 63.Body part 61 and limit
Portion 63 is all circular plates, and extension 62 is the cylinder to match with air hole 13, and extension 62 is connected to body part
Between 61 and limiting section 63, keep body part 61 and limiting section 63 parallel to each other.When sealing-plug 60 is installed at air hole 13,
Body part 61 is located in the first heavy platform 131 and covers air hole 13, and extension 62 protrudes into close with air hole 13 in air hole 13
Cooperation, and limiting section 63 is then positioned at lamina tecti 10 towards 1 interior side of secondary cell, and with the surface of lamina tecti 10 against
Cooperation, to be limited to body part 61 and extension 62.In this way, by body part 61 and limiting section 63 respectively with lamina tecti
10 both side surface is in close contact, and sealing-plug 60 is directly firmly fixed at air hole 13 by self structure.
Certainly, body part 61 and the area of limiting section 63 can it is identical can also be different, it is preferred that making the ruler of body part 61
The very little size with the first heavy platform 131 is adapted, and is guaranteed with will pass through the tight fit of periphery of body part 61 and the first heavy platform 131
The air-tightness of secondary cell 1.And when lamina tecti 10 has enough thickness, limiting section 63 can also be corresponded in lamina tecti 10
Towards 1 interior side of secondary cell, corresponding heavy platform structure is set.Sealing-plug 60 can be reduced by the way that the first heavy platform 131 is arranged
In the occupied space of short transverse, so as to guarantee the energy density of secondary cell 1.
In addition, body part 61 and limiting section 63 are not limited to the round sheet body in above-described embodiment, in other embodiments
Middle body part 61 and limiting section 63 can also be other shapes, such as square, triangle etc..Certainly preferably by the first heavy platform
131 size and the size of body part 61 are adaptably arranged.And the embodiment of the present invention is for the mounting means of sealing-plug 60
It is not limited, such as sealing-plug 60 can be set up directly on lamina tecti 10 by the way of integrated injection molding, it equally can also be with
The body part 61, extension 62 and limiting section 63 of sealing-plug 60 are successively installed on lamina tecti by the way of hot melt in sequence
10。
Since when carrying out hot tank test, the air pressure inside increase of secondary cell 1 needs certain time, so rotating sheet 25
It is not to put hot tank into secondary cell 1 just to overturn at once, and secondary cell 1 once enters in hot tank, the heat in hot tank
Can then be conducted to the sealing-plug 60 for being installed on lamina tecti 10 at once, sealing-plug 60 then can in response to environment temperature increase and deform.
I.e. after fusing point of the environment temperature close to sealing-plug 60, sealing-plug 60 can soften or melt, and be detached from so as to cause it and ventilative
The sealing state in hole 13 causes air hole 13 to be opened, at this point, after the gas generated inside secondary cell 1 can be via opening
Air hole 13 is expelled to outside.To be installed on 60 meeting of sealing-plug of lamina tecti 10 when secondary cell 1 carries out hot tank test
Deformation occurs first under the influence of heater temperature, so as to avoid secondary cell 1 from overturning into rotating sheet 25 after hot tank, leads
The internal resistance of electrode assembly 300 is caused to increase, and then initiation secondary cell 1 is on fire or even explodes.Therefore, the top cover of the embodiment of the present invention
Component 100 can reduce the thermal runaway probability in a high temperauture environment of secondary cell 1, improves secondary cell 1 and copes with hot environment
Ability.
Fig. 8 is the schematic diagram after the cutting along longitudinal direction of cap assembly 101 according to a second embodiment of the present invention；Fig. 9 is Fig. 8
Cap assembly 101 in C portion partial structurtes enlarged diagram；Figure 10 is the schematic diagram of 13 structure of air hole in Fig. 9.
In order to make it easy to understand, in the present embodiment, component as in the first embodiment uses identical label, and for
The structure being described in detail will not be repeated here again.As shown in Fig. 8 to Figure 10, another implementation according to the present invention
Example, similarly, sealing-plug 60 include three parts, and sealing-plug 60 limits simultaneously with two sides of lamina tecti 10 match respectively
It closes, is fixed at air hole 13 and air hole 13 is sealed, to guarantee the normal use of secondary cell 1, and this implementation
The material of sealing-plug 60 is identical as the material of above-mentioned second embodiment in example.The difference is that cap assembly 101 further includes pressure
Block 70, briquetting 70 can be externally to sealing-plug 60 be compressed, further to consolidate to sealing-plug 60 inside secondary cell 1
It is fixed.
Specifically, in the present embodiment, lamina tecti 10 is in addition to the first heavy platform 131 further includes the second heavy platform 132.Second heavy platform
132 in a ring, and is similarly formed in lamina tecti 10 away from 1 interior side of secondary cell, and is looped around the outer of the first heavy platform 131
Week, that is to say, that the second heavy platform 132 is the ring-type formed by the outer circumferential direction of the first heavy platform 131 far from the Directional Extension of air hole 13
Recess, so that the first heavy platform 131 and the second heavy platform 132 are configured to step-like structure.Certainly it should be noted that the first heavy platform
131 and second heavy platform 132 open up depth and expanding area needs not influence the structural strength of lamina tecti 10.
In the present embodiment, the also round plates of briquetting 70, and be arranged in the approximately mid way between of briquetting 70
There is through-hole 71.After sealing-plug 60 is installed at air hole 13, body part 61 is located in the first heavy platform 131, and briquetting 70 is then located at
In second heavy platform 132, that is to say, that body part 61 between briquetting 70 and lamina tecti 10 and simultaneously with briquetting 70 and top cover
Plate 10 contacts.And 13 position of air hole of the position of through-hole 71 and lamina tecti 10 is to just, to make two after the deformation of sealing-plug 60
Gas inside primary cell 1 is discharged by air hole 13 and through-hole 71.
An optional embodiment according to the present invention, in order to further ensure the air-tightness of secondary cell 1, sealing-plug 60
Also have cricoid raised 64.Specifically, in the present embodiment, body part 61 is on the surface towards briquetting 70 and lamina tecti 10 point
Not Huan Rao through-hole 71 be provided with protrusion 64, can be by convex so that body part 61 is with briquetting 70 and lamina tecti 10 when contacting
It plays 64 and forms cricoid seal line between body part 61 and briquetting 70 and between body part 61 and lamina tecti 10 respectively, thus
It can be further ensured that the air-tightness of secondary cell 1, avoid secondary cell 1 that gas leakage, leakage occurs under normal operating condition
Phenomenon, so as to improve the use reliability of secondary cell 1.
Therefore, in the present embodiment, when carrying out hot test to secondary cell 1, when environment temperature increase is even up to close
When the fusing point of blocking 60, the sealing state with air hole 13 is detached from by the deformation of sealing-plug 60 (melt or soften), in turn
Air hole 13 is opened, the gas in secondary cell 1 is enable to be discharged rapidly.Pass through the separate secondary cell in lamina tecti 10 simultaneously
1 side is added briquetting 70 and is further fixed to sealing-plug 60, additionally it is possible to prevent sealing-plug 60 in use from air hole 13
Place is detached from, thus can body part 61 to sealing-plug 60 apply pressure, fit closely body part 61 with lamina tecti 10, thus
Improve secondary cell 1 whole air-tightness and safety.
In addition, in a second embodiment, the through-hole 71 and air hole 13 of briquetting 70 are opposite, but the embodiment of the present invention is simultaneously
Without being limited thereto, in other examples, through-hole 71 can also be arranged at the other positions of briquetting 70, as long as in sealing-plug 60
After deformation, through-hole 71 can be connected inside secondary cell 1, to allow gas inside secondary cell 1 to pass through air hole 13
It is discharged with through-hole 71.In addition, in other examples, briquetting 70 may be located on lamina tecti 10 towards secondary cell
Side inside 1, at this point, limiting section 63 connects between lamina tecti 10 and briquetting 70 and simultaneously with lamina tecti 10 and briquetting 70
Touching then can equally realize the purpose for compressing sealing-plug 60 by briquetting 70.
Figure 11 is the cross-section structure signal after the cutting along longitudinal direction of cap assembly 102 according to a third embodiment of the present invention
Figure；Figure 12 is the partial structurtes enlarged diagram of the part D in the cap assembly 102 of Figure 11.In order to make it easy to understand, in this implementation
In example, identical label is used with component identical in second embodiment, and the structure for being described in detail will
It will not be repeated here again.As is illustrated by figs. 11 and 12, the material of sealing-plug 60 and above-mentioned second embodiment in the present embodiment
Material is identical, the difference is that, sealing-plug 60 includes two parts, and a side of sealing-plug 60 and lamina tecti 10 limits
Cooperation, is fixed at air hole 13 and is sealed to air hole 13, to guarantee the normal use of secondary cell 1.Certain top cover
Component 102 equally includes briquetting 70, by briquetting 70 externally to compression sealing-plug 60 inside secondary cell 1.
Lamina tecti 10 equally includes air hole 13, the first heavy platform 131 and the second heavy platform 132.Sealing-plug 60 includes connecting each other
The body part 61 and extension 62 connect, wherein body part 61 is located in the first heavy platform 131, and extension 62 protrudes into air hole 13,
And briquetting 70 is located in the second heavy platform 132.Then body part 61 be similarly positioned between briquetting 70 and lamina tecti 10 and simultaneously with pressure
Block 70 and lamina tecti 10 contact, so removing limiting section 63 equally on the basis of sealing-plug 60 of second embodiment can install
At air hole 13 and seal air hole 13.I.e. when carrying out hot test to secondary cell 1, when environment temperature is close to sealing-plug
When 60 fusing point, sealing-plug 60 can then deform and (melt or soften) and be detached from the sealing state with air hole 13, and then open
The gas in secondary cell 1 is discharged rapidly in air hole 13.
In addition, sealing-plug 60 in the present embodiment is fixed on lamina tecti 10 by briquetting 70, but the embodiment of the present invention
It is not limited to this, in other examples, the sealing-plug 60 for only including body part 61 and extension 62 can also use other
The mode of fixed form is fixed on lamina tecti 10.
Figure 13 is the cross-section structure signal after the cutting along longitudinal direction of cap assembly 103 according to a fourth embodiment of the present invention
Figure；Figure 14 is the partial structurtes enlarged diagram of the part E in the cap assembly 103 of Figure 13.In order to make it easy to understand, in this implementation
In example, identical label is used with component identical in 3rd embodiment, and the structure for being described in detail will
It will not be repeated here again.As shown in Fig. 8 to Figure 10, the present embodiment is similar to above-mentioned 3rd embodiment, the difference is that,
Sealing-plug 60 only includes body part 61, is cooperated with being limited by a side of body part 61 and lamina tecti 10, is fixed on ventilative
It is sealed at hole 13 and to air hole 13.Certain cap assembly 102 includes equally briquetting 70, by briquetting 70 externally to two
Sealing-plug 60 is compressed inside primary cell 1.
Lamina tecti 10 equally includes air hole 13, the first heavy platform 131 and the second heavy platform 132.The body part 61 of sealing-plug 60
In the first heavy platform 131, and briquetting 70 is located in the second heavy platform 132.Then body part 61 is similarly positioned in briquetting 70 and top cover
It simultaneously contacts with briquetting 70 and lamina tecti 10 between plate 10, prolongs so removing on the basis of sealing-plug 60 of 3rd embodiment simultaneously
Extending portion 62 can equally be installed at air hole 13 and seal air hole 13.I.e. when carrying out hot test to secondary cell 1, when
Environment temperature close to sealing-plug 60 fusing point when, sealing-plug 60 can then deform (melt or soften) and be detached from and air hole 13
Sealing state, and then air hole 13 is opened, the gas in secondary cell 1 is discharged rapidly.Equally, the sealing-plug in the present embodiment
60 can equally be connect by the way of other fixed forms with lamina tecti 10.
In addition, in three above-mentioned embodiments, air hole 13 is all set to lamina tecti 10, but the embodiment of the present invention
It is not limited to this.In other examples, air hole 13 can also be set to other positions of secondary cell 1, such as also
Air hole 13 can be arranged on the shell 200 of secondary cell 1, if can by air hole 13 for shell 200 inside
Gas discharge.In addition, sealing-plug 60 is by lamina tecti 10 far from secondary electricity in 3rd embodiment and fourth embodiment
1 interior side of pond is installed to the air hole 13 of lamina tecti 10, but the embodiment of the present invention is not limited to this, and is implemented in others
In example, sealing-plug 60 can also be installed by 1 interior side of secondary cell to lamina tecti 10.
According to another embodiment of the invention, a kind of secondary cell 1 is additionally provided, comprising: cap assembly 100, shell
200 and electrode assembly 300.Shell 200 has opening；Electrode assembly 300 is contained in shell 200, and including the first pole piece,
Two pole pieces and the partition being arranged between the first pole piece and the second pole piece；Cap assembly 100 covers the opening of shell 200, with
Electrode assembly 300 is enclosed in shell 200.Due to the structure to secondary cell 1 and excellent in the above embodiment
Point is illustrated, so be not repeated here herein.
The present invention can realize in other specific forms, without departing from its spirit and essential characteristics.Therefore, current reality
Apply example be all counted as being exemplary rather than in all respects it is limited, the scope of the present invention by appended claims rather than on
Description definition is stated, also, falls into the meaning of claim and whole changes in the range of equivalent to all be included in this
Among the range of invention.Also, the different technologies feature occurred in different embodiments can be combined, to obtain beneficial to effect
Fruit.Those skilled in the art will be understood that and realize revealed on the basis of studying attached drawing, specification and claims
The embodiment of other variations of embodiment.
Claims (11)
1. a kind of cap assembly of secondary cell characterized by comprising
Lamina tecti has air hole；
First electrode terminal insulate with the lamina tecti；
Second electrode terminal is electrically connected with the lamina tecti；
Conduct piece is electrically connected with the first electrode terminal and insulate with the lamina tecti；
Rotating sheet attaches to the lamina tecti, and the rotating sheet is configured to respond to the internal pressure of the secondary cell
Increase and overturn, so that the rotating sheet is electrically connected with the conduct piece；And
Sealing-plug seals the air hole and has the fusing point lower than the lamina tecti, and the sealing-plug is configured to respond to
The increase of the secondary cell local environment temperature and deform, to be detached from and the sealing state of the air hole.
2. cap assembly according to claim 1, which is characterized in that the melting range of the sealing-plug is 80 DEG C -200
℃。
3. cap assembly according to claim 1, which is characterized in that the sealing-plug includes body part, the body part
Cover the air hole and with a side surface of the lamina tecti against cooperation.
4. cap assembly according to claim 3, which is characterized in that the sealing-plug further includes extension, the extension
Portion is connected to the body part and protrudes into the air hole.
5. cap assembly according to claim 4, which is characterized in that the sealing-plug further includes limiting section, the limit
Portion is connected to the extension, and the surface far from the body part side of the limiting section and the lamina tecti is against matching
It closes.
6. cap assembly according to any one of claim 3 to 5, which is characterized in that the lamina tecti further includes annular
The first heavy platform, first heavy platform surrounds the circumference of the air hole and radially extending along the air hole, and described
Body part is contained in first heavy platform.
7. cap assembly according to claim 6, which is characterized in that the cap assembly further includes briquetting, the ontology
Portion contacts between the briquetting and the lamina tecti and simultaneously with the briquetting and the lamina tecti, and the briquetting has
Through-hole, the sealing-plug disengaging can be with the inside phase of the secondary cell with the through-hole after the sealing state of the air hole
Connection.
8. cap assembly according to claim 7, which is characterized in that the body part and the briquetting are respectively positioned on the top
The side of the inside far from the secondary cell of cover board, the through-hole are oppositely arranged with the air hole.
9. cap assembly according to claim 7, which is characterized in that the lamina tecti further includes the second heavy platform of annular,
Circumference of second heavy platform around first heavy platform and radially extending along the air hole, and the briquetting is contained in
In second heavy platform.
10. cap assembly according to claim 7, which is characterized in that the body part, which has, to be contacted with the briquetting
Cricoid protrusion, and the protruding ring is around the through-hole；Alternatively,
The body part has the cricoid protrusion contacted with the lamina tecti, and the protruding ring is around the air hole.
11. a kind of secondary cell characterized by comprising
Shell has opening；
Electrode assembly is contained in the shell, including the first pole piece, the second pole piece and setting are in first pole piece and institute
State the partition between the second pole piece；With
Cap assembly as described in any one of claims 1 to 10 covers the opening of the shell, by the electrode assembly
It is enclosed in the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711164736.2A CN109817853B (en) | 2017-11-21 | 2017-11-21 | Secondary cell's top cap subassembly and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711164736.2A CN109817853B (en) | 2017-11-21 | 2017-11-21 | Secondary cell's top cap subassembly and secondary cell |
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| Publication Number | Publication Date |
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| CN109817853A true CN109817853A (en) | 2019-05-28 |
| CN109817853B CN109817853B (en) | 2021-08-17 |
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| CN110391367A (en) * | 2019-08-08 | 2019-10-29 | 宁德时代新能源科技股份有限公司 | Cap assembly for secondary battery and secondary battery |
| CN110429214A (en) * | 2019-08-07 | 2019-11-08 | 宁德时代新能源科技股份有限公司 | Cap assembly for secondary battery and secondary battery |
| 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 |
| WO2021027489A1 (en) * | 2019-08-15 | 2021-02-18 | 宁德时代新能源科技股份有限公司 | Cover assembly of secondary battery and secondary battery |
| CN114747081A (en) * | 2019-12-04 | 2022-07-12 | 株式会社村田制作所 | Secondary battery |
| CN114759321A (en) * | 2022-05-24 | 2022-07-15 | 厦门海辰新能源科技有限公司 | Battery and sealing method |
| CN115863862A (en) * | 2022-11-30 | 2023-03-28 | 厦门海辰储能科技股份有限公司 | Battery module and free end cover assembly of battery |
| CN116014386A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
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| WO2021027489A1 (en) * | 2019-08-15 | 2021-02-18 | 宁德时代新能源科技股份有限公司 | Cover assembly of secondary battery and secondary battery |
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| CN114759321B (en) * | 2022-05-24 | 2024-03-08 | 厦门海辰储能科技股份有限公司 | Battery and sealing method |
| CN115863862A (en) * | 2022-11-30 | 2023-03-28 | 厦门海辰储能科技股份有限公司 | Battery module and free end cover assembly of battery |
| CN115863862B (en) * | 2022-11-30 | 2023-12-22 | 厦门海辰储能科技股份有限公司 | Battery module and battery cell end cover assembly |
| CN116014386B (en) * | 2023-02-09 | 2023-06-27 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| CN116014386A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
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