CN109792029B - Secondary battery and battery module - Google Patents
Secondary battery and battery module Download PDFInfo
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- CN109792029B CN109792029B CN201680088930.4A CN201680088930A CN109792029B CN 109792029 B CN109792029 B CN 109792029B CN 201680088930 A CN201680088930 A CN 201680088930A CN 109792029 B CN109792029 B CN 109792029B
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- sheet
- terminal
- secondary battery
- top cover
- piece
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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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
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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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
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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
Abstract
A secondary battery and a battery module relate to the technical field of energy storage device production, wherein the secondary battery comprises a first terminal (20), a second terminal (30), a top cover plate (10), an electrode assembly, a connecting piece (40) and a turnover plate (70), the electrode assembly comprises a first pole piece and a second pole piece, and at least one of the first terminal (20) and the second terminal (30) is arranged in an insulating way with the top cover plate (10); the connecting member (40) is electrically connected to the second terminal (20); the flip sheet (70) is attached to the first terminal (20); in a normal state, the first pole piece is electrically connected with the first terminal (20) through the turnover piece (70), and the second terminal (30) is electrically connected with the second pole piece; when the pressure in the secondary battery exceeds the reference pressure, the flip sheet (70) can be flipped over to disconnect the electrical connection state of the flip sheet (70) and the first pole piece, and the flipped-over flip sheet (70) is electrically connected to the connecting member (40) to electrically connect the first terminal (20) and the second terminal (30). Therefore, even if the automobile is in a running state, the automobile cannot be suddenly flamed out, and the safety of the automobile is improved.
Description
Technical Field
The application relates to the technical field of energy storage device production, in particular to a secondary battery and a battery module.
Background
For the EV hard-shell battery, in order to solve the overcharge problem, a scheme generally adopted in the industry is to cut off a main circuit of the battery before a battery core fails, so as to prevent the battery from being continuously charged, thereby ensuring the safety of the battery. The general structure is: the main loop of the first terminal electrically connected with the electrode assembly is provided with a current cut-off structure, the second terminal is always electrically insulated from the current cut-off structure, when the battery is overcharged and generates gas inside, and when the internal air pressure is increased to a certain value, the current cut-off structure is activated, so that the first terminal and the electrode assembly are disconnected, and the battery is prevented from being continuously charged.
However, in addition to the overcharge, during the normal use, the internal gas may be generated due to an unexpected internal short circuit, and the current cut-off structure is activated to open the circuit between the first terminal and the electrode assembly.
Disclosure of Invention
The present application provides a secondary battery and a battery module, which can solve the above problems.
A first aspect of the present application provides a secondary battery including a first terminal, a second terminal, a top cover sheet, an electrode assembly, a connecting member, and an inversion sheet,
the electrode assembly includes a first pole piece, a second pole piece, and a separator between the first pole piece and the second pole piece;
at least one of the first terminal and the second terminal is arranged in an insulated manner with the top cover sheet; the connecting piece is electrically connected with the second terminal;
the flip sheet is attached to the first terminal;
in a normal state, the first pole piece is electrically connected with the first terminal through the turnover piece, and the second terminal is electrically connected with the second pole piece;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can be turned over to disconnect the electrical connection state of the turnover sheet and the first pole piece, and the turnover sheet after turning over is electrically connected with the connecting piece to enable the first terminal to be electrically connected with the second terminal.
Preferably, the second terminal is electrically insulated from the top cover sheet; one end of the connecting piece is electrically connected with the second terminal, the other end of the connecting piece extends towards the first terminal, and the connecting piece is electrically insulated from the top cover plate.
Preferably, the first terminal comprises a terminal body and an extension part which are connected with each other, and the extension part is provided with a first through hole;
the top cover plate is provided with a second through hole which is opposite to the first through hole;
the turnover sheet seals the first through hole;
the connecting piece is positioned on one side of the top cover sheet far away from the electrode assembly, and at least part of the connecting piece is opposite to the first through hole.
Preferably, the electrode assembly further comprises a housing covered with the top cover plate, the top cover plate and the housing enclose an accommodating space, the accommodating space comprises a first chamber for accommodating the electrode assembly and a second chamber for providing an overturning space for the overturning plate, and the first chamber is not communicated with the second chamber.
Preferably, the top cover plate is provided with a first cavity, the first cavity is provided with a second cavity, and the second cavity is provided with a second cavity.
Preferably, the cover further comprises a first sealing member for sealing the first chamber and the second chamber, wherein the first sealing member is sealed between the turnover sheet and the top cover sheet.
Preferably, the turning sheet comprises a turning part and a first raised head,
the overturning part is of a sheet annular surface structure, and the edge of the overturning part is connected with the extending part;
the first raised head is connected to the turnover part, protrudes towards the direction of the connecting piece and is opposite to the first through hole and the part of the connecting piece opposite to the first through hole;
in a normal state, the first pole piece is electrically connected with the extension part through the turnover part.
Preferably, a conductive sheet is further included; in a normal state, the first pole piece is electrically connected with the first terminal through the conducting strip and the turnover piece in sequence;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can turn over to disconnect the conducting sheet, so that the first terminal is disconnected from the first pole piece in an electric connection state.
Preferably, the conductive sheet includes a first conductive portion, a second conductive portion and a thinned region,
the thinning area is positioned between the first conductive part and the second conductive part, and the thickness of the thinning area is smaller than that of the first conductive part and that of the second conductive part;
the first conductive part is connected with the turnover sheet; the second conductive part is connected with the first pole piece.
Preferably, the electric connector further comprises a resistance member, and the first terminal and the top cover sheet are electrically connected through the resistance member at all times.
Preferably, the battery further comprises a second conductive block electrically connected to the first terminal and located on a side of the top sheet remote from the electrode assembly, the resistive member being disposed between the second conductive block and the top sheet.
Preferably, the resistive element has a sheet structure, and the second conductive block, the resistive element, and the top cover sheet are stacked.
Preferably, the resistance element further comprises a fourth insulating piece, the fourth insulating piece is connected between the second conductive block and the top cover sheet in an insulating mode, and the resistance element penetrates through the fourth insulating piece.
Preferably, the resistance value of the resistance member is 1-100000 ohms.
A second aspect of the present application provides a battery module including at least two secondary batteries of any one of the above, the secondary batteries being connected in series with each other.
The technical scheme provided by the application can achieve the following beneficial effects:
the secondary battery that this application provided increases the connecting piece, and the upset piece is attached to first terminal, and when pressure in the secondary battery exceeded reference pressure, the upset piece can overturn and make the electric connection state of upset piece disconnection and first pole piece to the upset piece after the upset is connected with the connecting piece electricity, makes first terminal and second terminal electricity connect. Therefore, the secondary battery can solve the problem of battery overcharge, and can still keep the whole battery module in a passage state as a lead even if the battery module adopts a series connection mode, so that the automobile cannot suddenly flameout even if the automobile is in a running state, and the safety of the automobile is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a schematic structural view of one embodiment of a secondary battery provided herein;
fig. 2 is an exploded view of one embodiment of a secondary battery provided herein;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 4 is a partial schematic view of one embodiment of a secondary battery provided herein;
FIG. 5 is a schematic structural view of an embodiment of a flip sheet for a secondary battery provided herein;
FIG. 6 is a schematic structural diagram of an embodiment of a conductive sheet for a secondary battery provided herein;
fig. 7 is another partial structural view of an embodiment of a secondary battery provided in the present application;
fig. 8 is a sectional view of another embodiment of a secondary battery provided herein.
Reference numerals:
10-a top cover sheet;
20-a first terminal;
201-a terminal body;
202-an extension;
21-a second conductive block;
22-a third insulator;
23-a fourth insulator;
24-a second seal;
30-a second terminal;
31-a third conductive block;
32-a fifth insulating member;
33-a sixth insulator;
34-a third seal;
40-a connector;
41-a first insulator;
42-a first conductive block;
50-a resistive member;
70-turning over the sheet;
701-a turning part;
702 — a first nose;
703-a second nose;
704-a connecting portion;
705-mounting a boss;
71-a conductive sheet;
711-a first conductive portion;
712-a thinning region;
713-a second conductive portion;
714-a first vent;
715-a second vent;
72-a second insulator;
74-first seal.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
As shown in fig. 1 to 8, the present embodiment provides a secondary battery including a first terminal 20, a second terminal 30, a top cap sheet 10, an electrode assembly (not shown), a connecting member 40, and an inversion sheet 70, and a case (not shown) covering the top cap sheet 10. The electrode assembly includes a first pole piece, a second pole piece, and a separator between the first pole piece and the second pole piece.
The top cover sheet 10 seals the housing, both enclosing an accommodation space. The flip sheet 70 is attached to the first terminal 20. At least one of the first terminal 20 and the second terminal 30 is electrically insulated from the top cover sheet 10, that is, both the first terminal 20 and the second terminal 30 may be electrically insulated from the top cover sheet 10, or only one of them may be electrically insulated from the top cover sheet 10; the connection member 40 is electrically connected to the second terminal 30. In a normal state, the first pole piece is electrically connected with the first terminal 20 through the turnover piece 70, and the second pole piece is electrically connected with the second terminal 30; when the pressure in the secondary battery exceeds the reference pressure, the reversible sheet 70 can be reversed to disconnect the electrical connection state of the reversible sheet 70 with the first pole piece, and the reversed reversible sheet 70 is electrically connected with the connection member 40 to electrically connect the first terminal 20 and the second terminal 30.
In the above embodiment, the connecting member 40 is added, one end of the connecting member 40 is electrically connected to the second terminal 30, when the secondary battery is overcharged, when the internal pressure exceeds the reference pressure, the flipping sheet 70 can be flipped over to disconnect the electrical connection state of the flipping sheet 70 with the first pole piece, and the flipped over flipping sheet 70 is electrically connected to the connecting member 40, so that the first terminal 20 and the second terminal 30 are electrically connected, therefore, after the flipping sheet 70 is flipped over, both disconnection of the internal circuit of the failed secondary battery is achieved, and electrical connection of the flipping sheet 70 with the connecting member 40 is achieved, and further the first terminal 20 and the second terminal 30 of the secondary battery are electrically conducted through the connecting member 40, even if the battery module adopts a series connection mode, the secondary battery can still keep the whole battery module in a pass state as a lead wire; and when the secondary battery expands or compresses and the top-cover sheet 10 is welded to the case, the force generated thereby will be applied to the top-cover sheet 10, and if the inversion sheet 70 is disposed on the top-cover sheet 10, the deformation of the top-cover sheet 10 will cause the deformation of the inversion sheet 70, which causes stress to be generated inside the inversion sheet 70, which will cause the sensitivity of the inversion sheet 70 to be lowered, thereby affecting the safety of the secondary battery. The application attaches the turning sheet 70 on the first terminal 20, reduces the influence on the turning sheet 70 when the top cover sheet 10 is deformed, thereby being difficult to cause the phenomenon that the sensitivity of the turning sheet 70 is reduced and being beneficial to improving the safety of the secondary battery. To sum up, the secondary battery of this application even the car is in running state, can not flameout suddenly yet, has improved the security of car.
Generally, the first terminal 20 and the second terminal 30 are respectively mounted on the top cover sheet 10, wherein one of the first terminal 20 or the second terminal 30 electrically connected with the top cover sheet 10 may be directly connected to the top cover sheet 10 or connected to the top cover sheet 10 through a conductive structure. In order to facilitate electrical connection of the secondary battery to the outside, the first and second terminals 20 and 30 may each extend out of the top cover sheet 10, and particularly, when electrically insulated from the top cover sheet 10, an electrically insulated end extends out of the top cover sheet 10, as shown in fig. 3 where the first and second terminals 20 and 30 each extend out of the top cover sheet 10. In order to ensure the sealing property of the first terminal 20 or the second terminal 30 with the top cover sheet 10 when the first terminal 20 or the second terminal 30 protrudes out of the top cover sheet 10, the first terminal 20 is usually sealed with the top cover sheet 10 by a sealing member or a sealant, as shown in fig. 4, by the second sealing member 24; as shown in fig. 7, the second terminal 30 is sealed with the top cover sheet 10 by a third sealing member 34, and the second sealing member 24 and the third sealing member 34 may be sealing rings, gaskets, or the like.
The connection member 40 may be located outside the receiving space, i.e., on the side of the top cover sheet 10 away from the electrode assembly, with one end of the connection member 40 electrically connected to the second terminal 30 and the other end extending toward the first terminal 20, and the connection member 40 not contacting the top cover sheet 10.
The first terminal 20, the second terminal 30 and the top cover sheet 10 are connected in the following ways:
first, the second terminal 30 is electrically insulated from the top cover sheet 10, and the first terminal 20 may be electrically connected to the top cover sheet 10 (as shown in fig. 8) or electrically insulated from the top cover sheet 10 (as shown in fig. 3 and 4).
When the first terminal 20 is electrically connected to the top cover sheet 10, one end of the connection member 40 is electrically connected to the second terminal 30, and the other end extends toward the first terminal 20, and the connection member 40 is electrically insulated from the top cover sheet 10 so as to be rapidly electrically connected to the connection member 40 after the flip sheet 70 attached to the first terminal 20 is flipped.
Second, the second terminal 30 is electrically connected to the top cover sheet 10, and the first terminal 20 is electrically insulated from the top cover sheet 10.
In any case, as shown in fig. 3 and 4, the first terminal 20 is provided with a first through hole, and the flap 70 seals the first through hole. At this time, when the connecting piece 40 is located on one side of the top cover plate 10 far away from the first pole piece, the top cover plate 10 is provided with a second through hole, the second through hole is opposite to the first through hole, and at least part of the connecting piece 40 is opposite to the first through hole, so that the first pole piece is electrically connected with the first terminal 20 through the turnover piece 70 in a normal state; when the pressure in the secondary battery exceeds the reference pressure, the reversible sheet 70 can be reversed to disconnect the electrical connection state of the reversible sheet 70 with the first pole piece, and the reversed reversible sheet 70 is electrically connected with the connection member 40 to electrically connect the first terminal 20 with the second terminal 30 through the reversible sheet 70, the connection member 40. The arrangement of the first through hole and the second through hole facilitates the arrangement of the turnover sheet 70.
In order to facilitate the connection between the first terminal 20 and the flip sheet 70, the first terminal 20 includes a terminal body 201 and an extension portion 202 connected to each other, and as shown in fig. 2, a first through hole is provided in the extension portion 202. Generally, the terminal body 201 is sealed with the top cover sheet 10 by the second sealing member 24, the extension portion 202 is sealed with the top cover sheet 10 by the first sealing member 74 or a sealant, etc., and when the first terminal 20 is extended out of the top cover sheet 10, usually, one end of the terminal body 201 is extended out of the top cover sheet 10. The terminal body 201 and the extension portion 202 may be integrated or separated.
Generally, the receiving space defined by the top cover sheet 10 and the case includes a first chamber for receiving the electrode assembly, and a second chamber for providing the turning space for the turning sheet 70, that is, the turning sheet 70 divides the receiving space into the first chamber and the second chamber, and the first chamber and the second chamber are not communicated to ensure that the turning sheet 70 can be turned over when the pressure in the secondary battery exceeds the reference pressure.
Specifically, the sealing of the first chamber from the second chamber may be achieved by a first sealing member 74 or a sealant or the like, and generally, the first sealing member 74 is disposed along the outer circumference of the flap 70. When implemented by the first seal 74, the first seal 74 may be sealingly connected between the first terminal 20 and the top cover sheet 10 (between the extension 202 and the top cover sheet 10 when the extension 202 is provided), or the first seal 74 may be sealingly connected between the flip sheet 70 and the top cover sheet 10. The first seal 74 has a first sealing surface in sealing contact with the top sheet 10 and a second sealing surface in sealing contact with the extension 202 or the flip sheet 70, the first sealing surface and the second sealing surface being generally opposed in the height direction of the top sheet 10; the first sealing surface and the second sealing surface may be opposite to each other in a direction perpendicular to the height direction of the top lid sheet 10, that is, side sealing is achieved, for example, the extension portion 202 or the flip sheet 70 extends into the second through hole, and the first sealing member 74 is disposed between the inner wall of the second through hole and the extension portion 202 or the flip sheet 70; of course, the first sealing surface and the second sealing surface may also be opposite both in the height direction of the top sheet 10 and in a direction perpendicular to the height direction.
When the first terminal 20 is electrically connected to the top sheet 10, the secondary battery may further include a resistor 50, as shown in fig. 8, in which case, the first terminal 20 is electrically connected to the top sheet 10 through the resistor 50, and by adding the resistor 50, it is possible to reduce the current of the short circuit and ensure the safety of the nail penetration when the secondary battery is subjected to the nail penetration test. The resistive member 50 may have a columnar structure or a sheet structure.
In order to minimize the damage of the piercing pins, the resistive element 50 has a resistance of 1 to 100000 ohms, such as 1 ohm, 100 ohm, 1000 ohm, 100000 ohm.
In the above embodiments, the flip sheet 70 is constructed as shown in fig. 3-5, the flip sheet 70 includes a flip portion 701 and a first protrusion 702, the flip portion 701 is a sheet-shaped ring surface structure, and the edge of the flip portion is connected to the first terminal 20. A first nib 702 is coupled to the turning part 701, and the first nib 702 is coupled to a central region of the turning part 701, protrudes in a direction of the connector 40, and is opposite to a portion of the connector 40 opposite to the first through hole. So that the first pole piece is electrically connected to the first terminal 20 through the flip part 701 in a normal state. By adding the first projection 702, the distance between the flip chip 70 and the attachment member 40 in the flip chip 70 flip direction can be reduced so that the flip chip 70 can be quickly brought into contact with the attachment member 40 when the overcharge occurs.
Preferably, the first nib 702 extends into the second through-hole to reduce the distance the flip chip 70 flips.
In order to further reduce the turning stroke of the turning sheet 70 and ensure the connection reliability of the turning sheet 70 and the first pole piece, the turning sheet 70 further comprises a second raised head 703, the second raised head 703 is connected to the turning part 701 and projects towards the direction of the first pole piece, and the turning part 701 is electrically connected with the first pole piece through the second raised head 703 in a normal state.
The end surfaces of the first projection 702 and the second projection 703 are planar structures to increase the contact area between the flip sheet 70 and the first pole piece and between the flipped flip sheet 70 and the connecting member 40, thereby increasing the flow area.
The turning part 701 may be entirely located in the first through hole, or may be connected to an end of the first through hole, and preferably, the periphery of the turning part 701 is connected to an inner wall of the first through hole, so as to shorten the turning stroke of the turning piece 70, and simultaneously, ensure the connection reliability with the first pole piece and the connecting member 40 before and after turning.
Further, in order to ensure the reliability of the connection between the flip sheet 70 and the top cover sheet 10, a connection portion 704 is further provided at the periphery of the flip portion 701, the thickness of the connection portion 704 is greater than the thickness of the flip portion 701, the thickness refers to the dimension along the flipping direction of the flip sheet 70, and the flip portion 701 is connected to the first through hole through the connection portion 704.
The first through hole is preferably a stepped hole, and as shown in fig. 4, the connection portion 704 may be overlapped with a stepped surface of the stepped hole, and when only the turning portion 701 is provided, the turning portion 701 may be overlapped with the stepped surface, and the above structure may limit the position of the turning piece 70, and prevent the turning piece 70 from being unable to contact with the connection member 40 after turning due to loose connection between the turning piece 70 and the first terminal 20 in a normal state.
In general, the edge of the second through hole is located inside the turning part 701 in the projection along the axial direction of the first through hole, and particularly when the first tab 702 extends into the second through hole, it is possible to prevent the erroneous contact between the turning piece 70 and the connecting member 40 due to the loose connection between the turning piece 70 and the first terminal 20 in the normal state.
For convenience of connection, the secondary battery further includes a conductive sheet 71, as shown in fig. 4, in a normal state, the first pole piece is electrically connected to the first terminal 20 through the conductive sheet 71 and the turning sheet 70 in sequence; when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet 70 can turn over to disconnect the conductive sheet 71, so that the electric connection state of the first terminal 20 and the first pole piece is disconnected, and the processing and the assembly are facilitated by adding the conductive sheet 71.
Specifically, as shown in fig. 6, the conductive sheet 71 includes a first conductive portion 711, a second conductive portion 713, and a thinned region 712, the thinned region 712 being located between the first conductive portion 711 and the second conductive portion 713 and having a thickness smaller than the thickness of the first conductive portion 711 and the thickness of the second conductive portion 713; the first conductive part 711 is connected to the flip sheet 70, and is directly connected to the second tab 703 when the second tab 703 is provided; the second conductive portion 713 is connected to the first pole piece. In a normal state, the flip sheet 70 is electrically connected to the first pole piece through the first conductive portion 711, the thinned region 712, and the second conductive portion 713. By providing the thinned region 712, and connecting the first conductive part 711 to the flip sheet 70 and the second conductive part 713 to the first pole piece, when the flip sheet 70 is flipped, the conductive sheet 71 can be quickly broken at the thinned region 712, thereby quickly achieving the circuit break in the secondary battery.
Usually, the conductive sheet 71 is provided with a vent hole opposite to the flip sheet 70, and as shown in fig. 4 and 6, a first vent hole 714 or a second vent hole 715 may be provided, or both the first vent hole 714 and the second vent hole 715 may be provided. The first and second vent holes 714 and 715 penetrate the conductive sheet 71 in the turning direction of the turning sheet 70 so that the gas in the secondary battery can flow to the turning sheet 70, thereby turning the turning sheet 70. When the turning part 701 is provided, the second vent hole 715 is opposite to the turning part 701 in order to ensure that the gas quickly reaches the turning part 701 when the internal short circuit generates gas.
Further, in order to be able to stretch-break the conductive sheet 71 under a small pulling force, the thinned region 712 may be provided with an indentation and a breaking portion, or only one of an indentation and a breaking portion, where the first conductive portion 711 and the second conductive portion 713 are broken when the breaking portion is provided.
Usually, the first conductive part 711 is further provided with a mounting hole, the flip chip 70 is provided with a mounting protrusion 705, the mounting protrusion 705 can be connected to the second protrusion 703, and the mounting protrusion 705 is inserted into the mounting hole to ensure the connection precision of the conductive sheet 71 and the flip chip 70, so as to ensure that the conductive sheet 71 can be broken under the action of a preset pulling force. The mounting hole may be a through hole or a blind hole, and in the case of a through hole, the mounting hole and the first ventilation hole 714 may be the same through hole.
In order to prevent the conductive sheet 71 from directly contacting and forming an electrical connection with the first terminal 20, the contact position of the conductive sheet 71 and the first terminal 20 is implemented by an insulating structure, insulating glue or insulating varnish, the insulating structure may be a second insulating member 72 as shown in fig. 4, the second insulating member 72 is located between the conductive sheet 71 and the turning sheet 70, the second insulating member 72 is provided with a third through hole, and the turning sheet 70, the third through hole and the first conductive portion 711 are opposite to each other.
The second conductive portion 713 may be fixed to the first terminal 20 by means of bonding, screws, or the like, and in order to better fix the conductive sheet 71 and further ensure that the flip sheet 70 can be electrically disconnected from the conductive sheet after being flipped, the conductive sheet 71 may be fixed to the first terminal 20 by the second insulating member 72, and in this way, the second insulating member 72 simultaneously plays a role in insulation and fixation, thereby saving the number of parts and simplifying the assembly process.
In the above embodiments, as shown in fig. 4, the secondary battery further includes the first conductive piece 42, the first conductive piece 42 is connected to a portion of the connecting member 40 opposite to the first through hole, and the first conductive piece 42 is opposite to the first through hole, so as to further shorten the time for electrically connecting the connecting member 40 after the flipping sheet 70 is flipped.
The first conductive block 42 is not in contact with the top cover plate 10, and an insulating glue or a first insulating member 41 is disposed between the first conductive block 42 and the top cover plate, wherein the first insulating member 41 is provided with a third through hole, and the first conductive block 42, the third through hole and the first through hole are opposite.
In order to prevent the first conductive block 42 from deviating to cause poor contact between the turnover piece 70 and the connecting piece 40 after turnover, the first insulating member 41 is provided with a third groove, the first conductive block 42 is inserted into the third groove, and the first insulating member 41 is installed on the top cover plate 10.
Because only one end of the connecting piece 40 is connected with the second terminal 30, a cantilever structure is easily caused, after the turnover piece 70 is turned over, the impact force of the turnover piece 70 can make the connecting piece 40 move away from one end of the second terminal 30 to the direction away from the top cover piece 10, so that the turnover piece 70 is in poor contact with the connecting piece 40 after being turned over, and therefore, one end of the connecting piece 40 away from the second terminal 30 is connected with the top cover piece 10 through the first insulating piece 41, and the connecting mode can be bonding, clamping and the like.
In addition, in order to prevent the air pressure of the second chamber from obstructing the turning of the turning piece 70, the top cover piece 10 is further provided with an exhaust hole which is opposite to the turning piece 70 and penetrates in the thickness direction of the top cover piece 10.
In order to further facilitate the electrical connection between the first terminal 20 and the outside, the secondary battery further includes a second conductive block 21, particularly when the resistive element 50 is provided, the resistive element 50 is provided between the top cover sheet 10 and the second conductive block 21, the top cover sheet 10 is electrically connected to the first terminal 20 through the resistive element 50 and the second conductive block 21, when the resistive element is in a cylindrical structure, the second conductive block 21 and the top cover sheet 10 are electrically insulated by a fourth insulating element 23 or insulating varnish or insulating glue, that is, the second conductive block 21 and the top cover sheet 10 are not in direct contact to form electrical connection, the electrical connection needs to be realized through the resistive element 50, and after the resistive element 50 passes through the fourth insulating element 23, both ends are respectively connected to the second conductive block 21 and the top cover sheet 10. When the resistive element 50 has a sheet structure, the second conductive bumps 21, the resistive element 50 and the top cover sheet 10 are stacked to increase the reliability of connection.
Further, the top cover sheet 10 is provided with a first groove, and one end of the resistor 50 electrically connected with the top cover sheet 10 is inserted into the first groove; the second conductive block 21 is provided with a second groove, and the other end of the resistor 50 is inserted into the second groove to prevent the dislocation of the resistor 50; of course, it is also possible that only the top cover sheet 10 is provided with the first grooves, or that the second conductive block 21 is provided with the second grooves.
In order to facilitate the electrical connection of the connection member 40 with the second terminal 30 when the second terminal 30 is electrically insulated from the top cap sheet 10, the secondary battery further includes a third conductive block 31, and the third conductive block 31 is electrically insulated from the top cap sheet 10, which may be insulated by a sixth insulating member 33, an insulating paste, or an insulating varnish.
When the first terminal 20 or the second terminal 30 is electrically insulated from the top cover sheet 10, it may be implemented by an insulating member, an insulating paste, or an insulating varnish, as in fig. 4, the first terminal 20 is electrically insulated from the top cover sheet 10 by the third insulating member 22; as in fig. 7, the second terminal 30 is electrically insulated from the top cover sheet 10 by a fifth insulating member 32. The third insulating member 22 and the second insulating member 72 may be an integral structure.
In the above embodiments, the first terminal 20 is a positive terminal, the second terminal 30 is a negative terminal, and accordingly, the first electrode piece is a positive electrode piece and the second electrode piece is a negative electrode piece, so as to prevent the corrosion of the electrolyte to the case, especially when the first terminal 20 is electrically connected to the top cover sheet 10. Of course, the first terminal 20 may be a negative terminal, the second terminal 30 may be a positive terminal, and accordingly, the first electrode piece may be a negative electrode piece, and the second electrode piece may be a positive electrode piece.
The present application also provides a battery module including the secondary battery provided in any one of the above embodiments. The secondary batteries are arranged in a plurality of numbers, and can be connected in parallel or in series, and particularly when the secondary batteries are connected in series, the secondary batteries of any one of the embodiments can not cause the power failure of the whole battery module even if the turnover piece 70 is activated due to an accident, so that the stability of the battery module is ensured.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (15)
1. A secondary battery is characterized by comprising a first terminal, a second terminal, a top cover sheet, an electrode assembly, a connecting piece and an overturning sheet,
the electrode assembly includes a first pole piece, a second pole piece, and a separator between the first pole piece and the second pole piece;
at least one of the first terminal and the second terminal is arranged in an insulated manner with the top cover sheet; the connecting piece is electrically connected with the second terminal;
the flip sheet is attached to the first terminal;
in a normal state, the first pole piece is electrically connected with the first terminal through the turnover piece, and the second terminal is electrically connected with the second pole piece;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can be turned over to disconnect the electrical connection state of the turnover sheet and the first pole piece, and the turnover sheet after turning over is electrically connected with the connecting piece, so that the first terminal and the second terminal are electrically connected through the turnover sheet and the connecting piece.
2. The secondary battery according to claim 1, wherein the second terminal is electrically insulated from the top lid sheet; one end of the connecting piece is electrically connected with the second terminal, the other end of the connecting piece extends towards the first terminal, and the connecting piece is electrically insulated from the top cover plate.
3. The secondary battery according to claim 2, wherein the first terminal includes a terminal body and an extension portion connected to each other, the extension portion being provided with a first through hole;
the top cover plate is provided with a second through hole which is opposite to the first through hole;
the turnover sheet seals the first through hole;
the connecting piece is positioned on one side of the top cover sheet far away from the electrode assembly, and at least part of the connecting piece is opposite to the first through hole.
4. The secondary battery according to claim 3, further comprising a case covering the top cover sheet, wherein the top cover sheet and the case enclose a receiving space, the receiving space comprises a first chamber for receiving the electrode assembly and a second chamber for providing a turning space for the turning sheet, and the first chamber is not communicated with the second chamber.
5. The secondary battery of claim 4, further comprising a first seal that seals between the first and second chambers, the first seal being sealingly connected between the extension and the top cover sheet.
6. The secondary battery of claim 4, further comprising a first seal that effects a seal between the first chamber and the second chamber, the first seal being sealed between the flip sheet and the top cover sheet.
7. The secondary battery according to claim 3, wherein the flip sheet includes a flip portion and a first tab,
the overturning part is of a sheet annular surface structure, and the edge of the overturning part is connected with the extending part;
the first raised head is connected to the turnover part, protrudes towards the direction of the connecting piece and is opposite to the first through hole and the part of the connecting piece opposite to the first through hole;
in a normal state, the first pole piece is electrically connected with the extension part through the turnover part.
8. The secondary battery according to claim 1, further comprising a conductive sheet; in a normal state, the first pole piece is electrically connected with the first terminal through the conducting strip and the turnover piece in sequence;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can turn over to disconnect the conducting sheet, so that the first terminal is disconnected from the first pole piece in an electric connection state.
9. The secondary battery according to claim 8, wherein the conductive sheet includes a first conductive portion, a second conductive portion, and a thinned region,
the thinning area is positioned between the first conductive part and the second conductive part, and the thickness of the thinning area is smaller than that of the first conductive part and that of the second conductive part;
the first conductive part is connected with the turnover sheet; the second conductive part is connected with the first pole piece.
10. The secondary battery according to any one of claims 2 to 9, further comprising a resistance member through which the first terminal and the top lid sheet are electrically connected at all times.
11. The secondary battery according to claim 10, further comprising a second conductive piece electrically connected to the first terminal and located on a side of the top lid sheet away from the electrode assembly, the resistive member being disposed between the second conductive piece and the top lid sheet.
12. The secondary battery according to claim 11, wherein the resistive member has a sheet structure, and the second conductive land, the resistive member, and the top lid sheet are stacked.
13. The secondary battery of claim 11, further comprising a fourth insulating member insulatively connected between the second conductive block and the top cover sheet, the resistive member passing through the fourth insulating member.
14. The secondary battery according to claim 10, wherein the resistance member has a resistance value of 1 to 100000 ohms.
15. A battery module comprising at least two secondary batteries according to any one of claims 1 to 14, the secondary batteries being connected in series with each other.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/105859 WO2018090175A1 (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109792029A CN109792029A (en) | 2019-05-21 |
| CN109792029B true CN109792029B (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680088930.4A Active CN109792029B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Country | Link |
|---|---|
| CN (1) | CN109792029B (en) |
| WO (1) | WO2018090175A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864166B (en) * | 2018-06-20 | 2023-01-31 | 宁德时代新能源科技股份有限公司 | Output pole piece and battery module |
| CN111384326A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
| CN113422133B (en) * | 2021-05-11 | 2022-09-02 | 江苏正力新能电池技术有限公司 | Structure for preventing battery thermal runaway, battery shell and battery |
| WO2023070590A1 (en) * | 2021-10-29 | 2023-05-04 | 宁德新能源科技有限公司 | Electrochemical apparatus and electric device |
| CN114171841A (en) * | 2021-12-06 | 2022-03-11 | 宁德新能源科技有限公司 | Cover plate assembly, battery and power utilization device |
| CN114865237B (en) * | 2022-05-12 | 2024-02-13 | 常州瑞德丰精密技术有限公司 | Composite pole forming process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101042808B1 (en) * | 2010-01-26 | 2011-06-20 | 에스비리모티브 주식회사 | Rechargeable battery |
| KR101130294B1 (en) * | 2010-03-30 | 2012-08-23 | 에스비리모티브 주식회사 | Rechargeable Battery |
| US20110300414A1 (en) * | 2010-06-07 | 2011-12-08 | Woonseong Baek | Cap assembly and rechargeable battery having the same |
| US9099732B2 (en) * | 2010-06-11 | 2015-08-04 | Samsung Sdi Co., Ltd. | Rechargeable battery having a fuse with an insulating blocking member |
| US9251986B2 (en) * | 2011-07-06 | 2016-02-02 | In Kim | Rechargeable battery |
| CN202395111U (en) * | 2011-11-28 | 2012-08-22 | 上海比亚迪有限公司 | Power battery pack |
| KR101715963B1 (en) * | 2012-04-06 | 2017-03-27 | 삼성에스디아이 주식회사 | Secondary bttery |
| DE102013204341A1 (en) * | 2013-03-13 | 2014-09-18 | Robert Bosch Gmbh | Security element for battery cell |
| KR20150122518A (en) * | 2014-04-23 | 2015-11-02 | 삼성에스디아이 주식회사 | Battery pack |
| 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 |
| CN204760444U (en) * | 2015-07-30 | 2015-11-11 | 宁德时代新能源科技有限公司 | Secondary cell top cap and secondary cell |
| CN204946952U (en) * | 2015-09-21 | 2016-01-06 | 宁德时代新能源科技有限公司 | Secondary cell top cover and secondary 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 |
| CN106450136B (en) * | 2016-11-15 | 2020-02-14 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
-
2016
- 2016-11-15 WO PCT/CN2016/105859 patent/WO2018090175A1/en active Application Filing
- 2016-11-15 CN CN201680088930.4A patent/CN109792029B/en active Active
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| Publication number | Publication date |
|---|---|
| CN109792029A (en) | 2019-05-21 |
| WO2018090175A1 (en) | 2018-05-24 |
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