CN109792022B - Secondary battery and battery module - Google Patents
Secondary battery and battery module Download PDFInfo
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- CN109792022B CN109792022B CN201680088938.0A CN201680088938A CN109792022B CN 109792022 B CN109792022 B CN 109792022B CN 201680088938 A CN201680088938 A CN 201680088938A CN 109792022 B CN109792022 B CN 109792022B
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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
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
A secondary battery and a battery module relate to the technical field of energy storage device production, wherein a first terminal (20) is electrically connected with a top cover plate (10); the second terminal (30) is electrically insulated from the top cover sheet (10); the connecting member (40) is electrically connected to the second terminal (30); the top cover plate (10) is provided with a first through hole, and the turnover sheet (70) is attached to the top cover plate (10) and seals the first through hole; the conductive member (71) comprises a disconnecting part (711) connected with the turnover sheet (70) and a conductive part (713) connected with the first pole piece; the fusing component (80) is arranged between the conductive part (713) and the top cover sheet (10) and/or between the conductive part (713) and the turnover sheet (70), and the flow area of the fusing component (80) is smaller than that of the adjacent area; when the pressure in the secondary battery exceeds a reference pressure, the flip sheet (70) can be flipped over to disconnect the disconnection section (711), and the flipped-over sheet (70) is electrically connected to the connector (40) to electrically connect the first terminal (20) and the second terminal (30). 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 devices, 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 cap sheet, an electrode assembly, a connecting member, a fusing member, a conductive member, and a flip 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;
the first terminal is electrically connected with the top cover sheet; the second terminal and the connecting piece are respectively and electrically insulated from the top cover plate;
the connecting piece is electrically connected with the second terminal;
the top cover plate is provided with a first through hole, and the turnover plate is attached to the top cover plate and seals the first through hole;
the conductive piece comprises a disconnecting part connected with the turnover piece and a conductive part connected with the first pole piece;
in a normal state, the fusing component is electrically connected between the conductive part and the top cover plate and/or between the conductive part and the turnover sheet; and the flow area of the fusing member is smaller than that of the adjacent region;
the conductive part is connected with the disconnecting part, the first pole piece is electrically connected with the first terminal sequentially through the conductive part, the disconnecting part, the turnover piece and the top cover piece, and the second pole piece is electrically connected with the second terminal;
when the pressure in the secondary battery exceeds a reference pressure, the turnover sheet can be turned over to disconnect the disconnection portion, and the turned-over turnover sheet is electrically connected with the connecting member to electrically connect the first terminal and the second terminal.
Preferably, the fusing member is a flexible conductor, and both ends of the flexible conductor are connected to the conductive part and the flip piece, respectively.
Preferably, the flexible electrical conductor comprises an arched section, which is convex towards the flip piece.
Preferably, the power cable further comprises a first insulating part and a fixing part, wherein the first insulating part is arranged between the conductive part and the top cover plate, and the first insulating part is connected to the top cover plate through the fixing part.
Preferably, the fixing member includes a body and an extension portion extending from the body to the conductive portion, the extension portion is connected to the conductive portion, the body is connected to the top cover sheet, and the fusing member is the extension portion.
Preferably, the fuse member is electrically connected between the conductive portion and the flip sheet, the flip sheet includes a flip portion and a connecting boss,
the turnover part is of a sheet annular surface structure, and the edge of the turnover part is connected with the top cover plate;
the connecting raised head is connected to the turnover part, protrudes towards the direction of the conductive piece and is electrically connected with the conductive part through the fusing component.
Preferably, the turnover sheet further comprises a second raised head, the second raised head protrudes towards the direction of the first pole piece, and the turnover sheet is connected with the conductive part through the second raised head; the connecting raised head is connected to the turnover part through the second raised head.
Preferably, the break comprises a reduced thickness region having a thickness less than the thickness of the remaining area on the break;
in a normal state, the conductive part is connected with the disconnection part through the thinning area;
when the pressure in the secondary battery exceeds a reference pressure, the turning sheet can be turned over so that the disconnection portion is in the conductive portion disconnection in the thinning region.
A second aspect of the present application provides a battery module including the secondary batteries as set forth in 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:
according to the secondary battery provided by the application, by adding the connecting piece and the fusing component, the disconnecting part and the fusing component are connected in parallel in a normal state to form two current paths, and the first pole piece is electrically connected with the first terminal through the conducting part, the disconnecting part, the turnover piece and the top cover piece; the second strip is that the first pole piece is electrically connected with the first terminal through the conductive part, the fusing component, the turnover piece and the top cover piece, or the first pole piece is electrically connected with the first terminal through the conductive part, the fusing component and the top cover piece. When the pressure in the secondary battery exceeds the reference pressure, the turnover piece can turn over to disconnect the disconnection part, and the turned turnover piece is contacted with the connecting piece, so that the first terminal is electrically conducted with the second terminal through the top cover piece, the turnover piece and the connecting piece, at the moment, because the disconnection part is disconnected, the first path is disconnected with the conductive part at the disconnection part, and the second loop is still communicated, even if the battery module adopts a series connection mode, the disconnection between the whole battery modules can not be formed at the moment of turning over the turnover piece, and because the first terminal is directly electrically conducted with the second terminal at the moment, the fusing part can be fused in a short time, so that the second path is disconnected, but the subsequent whole fault secondary battery is directly connected in the battery module as a lead wire due to the electrical conduction of the first terminal and the second terminal, so that the whole battery module is still in a passage state, thereby improving the safety of the automobile.
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. 1a is a schematic structural view of another embodiment of a secondary battery provided herein;
fig. 1b is a schematic structural view of another embodiment of a secondary battery provided herein;
fig. 2 is an exploded view of the secondary battery provided in fig. 1;
fig. 2b is an exploded view of the secondary battery provided in fig. 1 b;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3a is a cross-sectional view of the secondary battery provided in fig. 1 a;
fig. 3b is a sectional view of the secondary battery provided in fig. 1 b;
fig. 4 is a partial schematic view of the secondary battery provided in fig. 1;
FIG. 4b is a partial schematic view of the secondary battery provided in FIG. 1 b;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 5a is a partial schematic view of the secondary battery provided in FIG. 1 a;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 1;
fig. 7 is another partial schematic view of the secondary battery provided in fig. 1;
fig. 8 is a schematic structural view illustrating an embodiment of a fixing member in the secondary battery provided in fig. 1;
FIG. 9 is a cross-sectional view taken along line D-D of FIG. 8;
fig. 10 is a schematic structural view of an embodiment of a connecting member in the secondary battery provided in fig. 1 a;
fig. 11 is a schematic structural view of an embodiment of a flip sheet in a secondary battery provided in the present application;
fig. 11b is a schematic structural view of another embodiment of an inversion sheet in a secondary battery provided in the present application;
fig. 12 is a schematic structural diagram of an embodiment of a conductive device in a secondary battery provided in the present application.
Reference numerals:
10-a top cover sheet;
20-a first terminal;
30-a second terminal;
31-a second conductive block;
32-a fourth insulator;
33-a fifth insulating member;
34-a seal;
40-a connector;
401-a contact;
402-a transition;
403-a connecting part;
404-a bending part;
41-a second insulator;
42-a first conductive block;
43-a third insulator;
60-an explosion-proof valve;
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;
706-a coupling projection;
71-a conductive member;
711-a break;
712-a thinning region;
713-a conductive portion;
714-a first vent;
715-a second vent;
72-a first insulator;
73-a fixture;
80-fuse member.
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 12, 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, a fusing member 80, a conductive member 71, and an inversion sheet 70, and a case (not shown). 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 first terminal 20 is electrically connected with the top cover sheet 10, and specifically, as shown in fig. 1-3, 4, and 7, the top cover sheet 10 is provided with a first through hole, and the flip sheet 70 is attached to the top cover sheet 10 and seals the first through hole, so that the top cover sheet 10, the flip sheet 70 and the housing form a sealed cavity. Preferably, the top cover plate 10 may be provided with a second groove, and the first terminal 20 is inserted into the second groove; the second terminal 30 is electrically insulated from the top cover sheet 10, which may be implemented by an insulating member or an insulating paste, an insulating varnish, as in fig. 7, and insulated from the top cover sheet 10 by a fourth insulating member 32. The connection member 40 is electrically insulated from the top cover sheet 10 and electrically connected to the second terminal 30, and at least a portion of the connection member 40 is opposed to the first through hole.
The conductive member 71 includes a disconnecting portion 711 connected to the flip sheet 70 and a conductive portion 713 connected to the first pole piece (the two may be directly connected or may be connected by a conductive structure).
The fusing member 80 may be formed in several ways: first, the fuse member 80 is electrically connected between the conductive portion 713 and the top cover plate 10, that is, the conductive portion 713, the fuse member 80 and the top cover plate 10 are electrically connected in sequence, and at this time, the conductive portion 713 may be directly electrically connected to the top cover plate 10 through the fuse member 80 or may be electrically connected to the top cover plate 10 through a conductive structure; second, the fuse member 80 is electrically connected between the conductive portions 713 and the flip sheet 70, and the conductive portions 713, the fuse member 80, the flip sheet 70, and the top cover sheet 10 are electrically connected in this order; and a third structure having both the first and second structures. In either case, the current flowing area of the fusing member 80 is smaller than that of the neighboring region thereof, so that the fusing member 80 is preferentially fused than the neighboring region thereof at the same current.
In a normal state, the conductive part 713 is connected with the disconnecting part 711, the first pole piece is electrically connected with the first terminal 20 sequentially through the conductive part 713, the disconnecting part 711, the turnover piece 70 and the top cover piece 10, the second pole piece is electrically connected with the second terminal 30, at this time, the fusing member 80 is connected with the disconnecting part 711 in parallel, namely the first terminal 20 and the first pole piece form two current paths, and the first pole piece is a first path formed by electrically connecting the first pole piece with the first terminal sequentially through the conductive part 713, the disconnecting part 711, the turnover piece 70 and the top cover piece 10; the second path is a second path formed by electrically connecting the first pole piece to the first terminal 20 through the conductive portion 713, the fuse member 80, the flip piece 70 and the top cover piece 10 in sequence, or electrically connecting the first pole piece to the first terminal 20 through the conductive portion 713, the fuse member 80 and the top cover piece 10 in sequence.
When the pressure in the secondary battery exceeds the reference pressure, the reversing sheet 70 can be reversed to disconnect the disconnecting part 711, that is, the first path is broken, and the flipped sheet 70 is electrically connected to the connecting member 40 (the flipped sheet 70 may be directly electrically connected to the connecting member 40 in a direct contact manner, or a conductive body, such as the first conductive block 42 shown in fig. 3 and 4, may be provided between the flipped sheet 70 and the connecting member 40, and the two are electrically connected through the conductive body), so that the first terminal 20 is electrically connected to the second terminal 30 through the top cover sheet 10, the flipped sheet 70, the connecting member 40, before the turnover piece 70 is not in contact with the connection piece 40 after the disconnection portion 711 is disconnected, the second path is still communicated, when the first terminal 20 is electrically connected to the second terminal 30, since the current in the short circuit is large, is fused at the fusing member 80 and thus the second path is also opened, i.e., the second path is opened after the first terminal 20 is electrically connected with the second terminal 30.
In the secondary battery, the connecting piece 40 and the fusing component 80 are added, the disconnecting part 711 and the fusing component 80 are connected in parallel in a normal state to form two current paths, when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet 70 can be turned over to disconnect the disconnecting part 711, at the moment, the first path is disconnected, the second path is still connected, the first terminal 20 and the first pole piece are still in an electric connection state before the turnover sheet 70 is contacted with the connecting piece 40, and further the disconnection of the battery module in the process is avoided; the first terminal 20 is electrically conducted with the second terminal 30 through the top cover plate 10, the turnover plate 70, the connecting member 40 and the second terminal 30 until the turnover plate 70 is contacted with the connecting member 40 after being turned over, the current of the second path is instantly increased due to the short circuit of the first terminal 20 and the second terminal 30, so that the fusing member 80 is fused, after the fusing member 80 is fused, the electric connection state of the first terminal 20 and the first pole piece is completely disconnected, and at the moment, the secondary battery can be directly connected into a battery module as a lead wire because the first terminal 20 and the second terminal 30 are electrically connected, the whole battery module can still be kept in the path state, and further the safety of an automobile is improved.
When fuse 80 is electrically connected between conductive portion 713 and flip sheet 70, fuse 80 is preferably a flexible electrical conductor having opposite ends connected to conductive portion 713 and flip sheet 70, respectively, for ease of connection and assembly.
When the flexible electric conductor is of a sheet structure, the flexible electric conductor can be provided with a through hole or a blind hole, and the axis of the through hole or the blind hole is perpendicular to the current direction in the passage where the flexible electric conductor is located, namely, the flexible electric conductor is disconnected at the through hole or the blind hole along the current direction in the passage where the flexible electric conductor is located; or the flexible conductor is provided with a notch, the notch can be arranged on the side edge of the flexible conductor, and the flexible conductor is disconnected at the notch along the current direction in the passage where the flexible conductor is positioned.
The fusing member 80 may be provided with only one, or two, three, or more, and when the fusing member 80 is provided in plurality, the fusing members 80 are distributed along the circumferential direction of the conductive member 71. When the fusing member 80 is electrically connected between the conductive portion 713 and the top cover sheet 10, two fusing members are usually provided, and are respectively located at two opposite sides of the conductive member 71, so as to further ensure the conduction of the second path when the flip sheet 70 is flipped and not contacted with the connecting member 40.
In order to prevent the conductive member 71 from directly contacting and forming an electrical connection with the top cover sheet 10, the contact position of the conductive member 71 and the top cover sheet 10 may be provided with an insulating structure, such as a first insulating member 72 shown in fig. 3-5a, an insulating glue or an insulating varnish, the insulating structure may be a first insulating member 72, the first insulating member 72 is located between the conductive member 71 and the turning sheet 70, the first insulating member 72 is configured as shown in fig. 2, and is provided with a second through hole, and the turning sheet 70, the second through hole and the disconnecting part 711 are opposite to each other.
In order to better fix the conductive member 71 and ensure that the turning piece 70 can be electrically disconnected from the conductive portion 713 quickly after being turned over, the conductive member 71 can be fixed to the top cover plate 10 through the first insulating member 72, in this way, the first insulating member 72 can simultaneously play a role in insulation and fixation, thereby saving the number of parts and simplifying the assembly process.
The first insulator 72 and the top cover plate 10 can be fixed by bonding, clamping, etc., since the first insulator 72 is usually made of non-metal material, the top cover plate 10 is made of metal material, so as to facilitate the connection of the two, the secondary battery further comprises a fixing member 73, and the first insulator 72 is connected to the top cover plate 10 through the fixing member 73.
Specifically, as shown in fig. 8 to 9, the fixing member 73 includes a body 731 and an extending portion 732 extending from the body 731 to the conductive portion 713, the extending portion 732 is connected to the conductive portion 713, the body 731 is connected to the top cover sheet 10, and when the fuse member 80 is electrically connected between the conductive portion 713 and the top cover sheet 10, the fuse member 80 is the extending portion 732, that is, the fuse member 80 is electrically connected to the top cover sheet 10 through the body 731. By integrating the fusing member 80 with the fixing member 73, the strength of the fusing member 80 can be increased, and assembly can be facilitated.
The extension 732 can be disposed at any position of the body 731, as shown in fig. 5 and 5a, the extension 732 extends in a direction perpendicular to the extension direction of the connecting element 40; or the extension 732 may extend in a direction parallel to the extension direction of the connection member 40, as shown in fig. 3 a.
The fixing members 73 may be provided in two or more numbers, and when the fusing member 80 is provided in two numbers, respectively, on opposite sides of the conductive member 71, the fixing members 73 are correspondingly provided in two numbers.
The first insulating member 72 and the fixing member 73 may be connected by welding, riveting or screwing. Generally, in order to mate with the fixture 73, the first insulator 72 is provided with a fixture mating portion, and the fixture 73 is engaged with the fixture mating portion. As shown in fig. 5 and 5a, the main body 731 includes a fixing portion connected to the top cover sheet 10, and a clamping portion bent from the fixing portion and extending in a direction away from the top cover sheet 10, and the clamping portion is clamped into the fixing member engaging portion. The fixing piece 73 is connected with the first insulating piece 72 through a clamping structure, and the installation is convenient.
In order to facilitate the fixing operation of the fixing member 73 and the top cover plate 10, the first insulating member 72 is further provided with a third through hole, the third through hole penetrates through the first insulating member 72 along the direction that the top cover plate 10 points to the first insulating member 72, and the third through hole is opposite to the fixing member 73.
The joint portion can be equipped with one or two, and when being equipped with two, two joint portions extend from the relative both ends of fixed portion respectively, and each joint portion card respectively goes into the relative both sides of mounting cooperation portion.
The fixing member 73 and the fixing member engaging portion may be only provided with one set, or may be provided with multiple sets, such as two sets, three sets or more sets, generally, the fixing member 73 and the fixing member engaging portion are provided with two sets, and the two sets of fixing members 73 and the fixing member engaging portion are respectively located at two sides of the first through hole.
As shown in fig. 12, the break 711 includes a thinned region 712, the thinned region 712 having a thickness smaller than the thickness of the remaining portion of the break 711; in a normal state, disconnection portion 711 is connected to conductive portion 713 through thinned region 712, and when flip sheet 70 is flipped, conductive member 71 can be quickly broken at thinned region 712, thereby quickly achieving disconnection in the secondary battery.
Further, in order to be able to break the conductive member 71 under a small pulling force, the thinning region 712 may be provided with an indentation and a breaking portion, or only one of an indentation and a breaking portion, where the breaking portion 711 is broken from the conductive portion 713.
Generally, the conductive member 71 is provided with a vent hole opposite to the flip sheet 70, as shown in fig. 12, the vent hole may be a first vent hole 714 or a second vent hole 715, 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 member 71 in the turning direction of the turning sheet 70 so that gas in the secondary battery can flow to the turning sheet 70, thereby turning the turning sheet 70.
In the above embodiments, the structure of the flip sheet 70 is shown in fig. 11 and 11b, the flip sheet 70 includes a flip portion 701 and a connecting protrusion 706, the flip portion 701 is a sheet-shaped ring surface structure, and the edge thereof is connected to the top cover sheet 10 (as shown in fig. 3). When the fuse member 80 is electrically connected between the conductive portions 713 and the flip sheet 70, as shown in fig. 11b, the connection bosses 706 are connected to the flip portions 701 directly or through a transition structure, protrude in the direction of the conductive members 71, and are electrically connected to the conductive portions 713 through the fuse member 80. The attachment of conductive portion 713 to flip chip 70 via fuse member 80 can be facilitated by the addition of attachment tabs 706. When the second vent hole 715 is provided, in order to ensure that the gas quickly reaches the turning part 701 when the internal short circuit generates gas, the second vent hole 715 is opposite to the turning part 701.
The flip chip 70 further includes a first tab 702, the first tab 702 being coupled to the flip part 701, the first tab 702 being coupled to a central region of the flip part 701 generally and protruding in a direction of the connector 40 and being opposite to a portion of the connector 40 opposite to the first through hole. So that the first pole piece is electrically connected with the first terminal 20 through the turning part 701 and the top cover plate 10 in sequence 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.
In order to reduce the turning stroke of the turning tab 70 and ensure the connection reliability of the turning tab 70 and the first pole piece, the turning tab 70 further comprises a second protrusion 703, the second protrusion 703 protrudes in the direction of the first pole piece, the connecting protrusion 706 is connected to the turning portion 701 through the second protrusion 703, the turning tab 70 may only comprise the turning portion 701 and the second protrusion 703, as shown in fig. 11, the second protrusion 703 is connected to the turning portion 701, the turning portion 701 is electrically connected to the disconnecting portion 711 through the second protrusion 703 in a normal state, and the second protrusion 703 may be overlapped with the disconnecting portion 711. When only the connecting tab 706 is included, the connecting tab 706 may be electrically connected to the disconnecting portion 711.
Generally, since the connecting member 40 and the disconnecting portion 711 have a planar structure, the end surfaces of the first tab 702 and the second tab 703 have a planar structure, respectively, so as 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.
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.
Wherein the first through hole is preferably a stepped hole. In the first embodiment, including the large hole located on the side close to the electrode assembly and the small hole, as shown in fig. 4, the turning part 701 is connected to the large hole, and when the connecting part 704 is provided, the connecting part 704 is connected to the large hole; the first projection 702 extends into the small hole to limit the position of the flip-chip 70 and prevent the flip-chip 70 from being erroneously contacted with the connecting member 40 due to the loose connection between the flip-chip 70 and the top cover sheet 10 in a normal state.
In general, the flip chip 70 is provided with a mounting protrusion 705, the connecting protrusion 706 is connected to the second protrusion 703 or the flip portion 701 through the mounting protrusion 705, when the flip chip 70 does not include the connecting protrusion 706, the mounting protrusion 705 can be directly connected to the flip chip 70 or connected to the second protrusion 703, and accordingly, the disconnecting portion 711 is further provided with a mounting hole into which the mounting protrusion 705 is inserted to ensure the connection accuracy between the conductive member 71 and the flip chip 70, thereby ensuring that the conductive member 71 can be pulled apart by a predetermined pulling force. The mounting hole may be a blind hole or a through hole, and in the case of a through hole, the mounting hole and the first ventilation hole 714 may be the same through hole.
The secondary battery further includes an explosion-proof valve 60, as shown in fig. 2 to 3b, the top cover plate 10 is provided with an explosion-proof hole, and the explosion-proof valve 60 is mounted to the top cover plate 10 and circumferentially seals the explosion-proof hole such that the explosion-proof valve 60 forms a gas discharge area at the opening thereof. In order to ensure smooth air discharge of the explosion-proof valve 60, the projection of the connecting piece 40 in the height direction is positioned outside the projection range of the explosion-proof valve 60 in the height direction and positioned in the projection range of the top cover plate 10 in the height direction, namely, the connecting piece 40 is arranged outside the air discharge area.
Generally, the first terminal 20 and the second terminal 30 are respectively mounted on the top cover sheet 10, wherein the first terminal 20 may be directly electrically connected to the top cover sheet 10 or may be 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 protrude out of the top cover sheet 10, and particularly, the second terminal 30, such as the second terminal 30 in fig. 3, protrudes out of the top cover sheet 10. In order to ensure the sealing property between the first terminal 20 or the second terminal 30 and the top cover sheet 10 when the first terminal 20 or the second terminal 30 protrudes from the top cover sheet 10, the first terminal 20 or the second terminal 30 is usually sealed by a sealing member or a sealant, as shown in fig. 7, the second terminal 30 is sealed with the top cover sheet 10 by a sealing member 34, and the sealing member 34 may be a sealing ring, a sealing gasket, or the like.
Generally, the connection member 40 is located outside the receiving space, i.e., on the side of the top cap sheet 10 away from the electrode assembly, and 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.
When the pressure in the secondary battery exceeds the reference pressure, the flip sheet 70 and the connection member 40 may be in direct contact, or may be in contact connection through a conductive structure.
The connector 40 has a structure as shown in fig. 1a and 10a, and the connector 40 includes a conductive portion 403 electrically connected to the second terminal 30, a contact portion 401 for contacting the flip sheet 70, and a transition portion 402 connecting the conductive portion 403 and the contact portion 401. Conductive portion 403, transition portion 402, and contact portion 401 may be formed integrally or separately. Wherein, when the connecting member 40 and the turning sheet 70 are in contact connection through the conductive structure, the contact portion 401 may be opposite to or not opposite to the turning sheet 70.
As shown in fig. 1a, the transition portion 402 may be at least partially disposed along the outer circumference of the explosion-proof valve 60, and the outer circumference perpendicular to the turning direction of the turning sheet 70 can provide space utilization of the battery cell by being disposed along the outer circumference, i.e., the circumference of the plane where the length and the width of the two batteries are located.
The transition part 402 includes an annular section, the explosion-proof valve 60 is located in the annular section, and since the connecting member 40 extends from the second terminal 30 to the first terminal 20 to form a cantilever structure, the secondary battery may shake or deform during use, causing erroneous contact with the flip sheet 70; or after the turnover sheet 70 is turned over, the safety of the automobile is reduced probably because the turnover sheet rocks and cannot contact with the turnover sheet, and the strength of the connecting piece 40 can be increased by the annular arrangement, so that the turnover sheet is prevented from rocking and deforming.
The ring segments may be split rings or closed rings. In the case of a split ring, the split ring opens towards the explosion-proof valve 60, as shown in FIG. 1 a; in the case of a closed loop, the burst valve 60 is located within the closed loop to further increase the strength of the connector 40.
In order to further save space, in the case of an open ring, the open ring may have the same shape as part of the outer contour of the explosion-proof valve 60, and in the case of a closed ring, the closed ring may have the same shape as the outer contour of the explosion-proof valve 60, wherein the same shape means that both are arranged in a shape-following manner, i.e. the radial distance between the ring segment and the explosion-proof valve is equal.
Generally, the connecting member 40 further includes a bending portion 404, the bending portion 404 is formed to be bent in the turning direction of the turning piece 70, that is, two ends of the bending portion 404 are staggered in the turning direction of the turning piece 70, and the transition portion 402, the contact portion 401 and the conductive portion 403 are respectively connected by the bending portion 404, as shown in fig. 3, so that the transition portion 402, the conductive portion 403 and the contact portion 401 form a height difference, thereby facilitating assembly. Of course, only the transition portion 402 and the contact portion 401 may be connected by the bent portion 404, or only the conductive portion 403 may be connected by the bent portion 404.
Because the module wire harness is generally arranged above the top cover plate 10, the connecting piece 40 occupies the space of the module wire harness, and the difficulty of wiring the module wire harness is increased, for this reason, a concave part is arranged on one surface of the top cover plate 10 close to the connecting piece 40, the concave part is concave towards the direction of the electrode assembly, the transition part 402 is at least partially sunk into the concave part, and the transition part 402 can be completely sunk into the concave part; it is also possible to partially sink into the depression as shown in fig. 1 to save space in the height direction of the secondary battery, which is parallel to the direction of inversion of the inversion sheet 70. The connecting element 40 may also be fully recessed when the parts of the connecting element 40 are in the same plane. Through sinking transition portion 402 into the depressed part, increased the space of arranging of module pencil, convenient wiring.
Since the connection member 40 extends from the second terminal 30 in the direction of the first terminal 20, the recess also extends along the second terminal 30 in the direction of the first terminal 20 to better accommodate the transition 402. Generally, the connecting member 40 has a plate-like structure, and the cross section of the recess is trapezoidal or rectangular, and when the cross section is trapezoidal, the small end of the trapezoid is located at the bottom of the recess to facilitate the installation of the connecting member 40, wherein the cross section is a section perpendicular to the direction in which the first terminal 20 points to the second terminal 30.
In order to prevent direct contact of the connection member 40 with the top cap sheet 10, especially when at least a portion of the connection member 40 is sunk into the recess, the secondary battery further includes a second insulating member 41, and the second insulating member 41 is disposed between the connection member 40 and the top cap sheet 10. Preferably, the second insulating member 41 wraps at least the transition portion 402, i.e. the cross section of the second insulating member 41 is annular, wherein the cross section is also a section perpendicular to the direction in which the first terminal 20 points towards the second terminal 30, to better reduce the risk of direct contact of the connection member 40 with the top cover sheet 10. The second insulating member 41 may have a planar structure or a groove-like structure.
In order to avoid the cantilever structure of the connecting member 40, a third insulating member 43 is further included, and the connecting member 40 can be connected to the top cover plate 10 through the third insulating member 43 in a bonding, clamping or bolting manner, and in the case of bolting, an insulating bolt is preferred. Further, the third insulating member 43 may also extend between the first terminal 20 and the connection piece 40 to prevent direct contact connection of the first terminal 20 and the connection piece 40. One end of the third insulating member 43 may be fixed between the first terminal 20 and the top cover sheet 10, and the connecting member 40 is connected between the top cover sheets 10 through the other end to better fix the connecting member 40.
In the above embodiments, as shown in fig. 4, the secondary battery further includes the first conductive block 42, the end of the connecting member 40 opposite to the first through hole is connected with the first conductive block 42, the first conductive block 42 is opposite to the first through hole, and the first conductive block 42 is not directly contacted with the top cover plate 10, so as to further shorten the time for electrically connecting with the connecting member 40 after the flipping sheet 70 is flipped.
When the third insulating member 43 is disposed, the third insulating member 43 is disposed between the first conductive block 42 and the top cover plate 10, wherein the third insulating member 43 has a fourth through hole, and the first conductive block 42, the fourth through hole and the first through hole are opposite.
In order to prevent the position of the first conductive block 42 from shifting and causing the contact failure between the turnover piece 70 and the connecting piece 40 after turnover, the third insulating member 43 is provided with a first groove, and the first conductive block 42 is inserted into the first groove.
Further, the first conductive bump 42 may be further provided with a contact boss inserted into the first through hole, and the third insulator 43 extends to between the contact boss and the first through hole, i.e., between the contact boss and the first through hole, insulated by the third insulator 43.
In order to facilitate the electrical connection of the connection member 40 to the second terminal 30, the secondary battery further includes a second conductive block 31, and the second conductive block 31 is electrically insulated from the top cover sheet 10, which may be insulated by a fifth insulating member 33, an insulating paste, or an insulating varnish.
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 (9)
1. A secondary battery includes a first terminal, a second terminal, a top cover, an electrode assembly, a connecting member, a fusing member, a conductive member, and a flip 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;
the first terminal is electrically connected with the top cover sheet; the second terminal and the connecting piece are respectively and electrically insulated from the top cover plate; the connecting piece is electrically connected with the second terminal;
the top cover plate is provided with a first through hole, and the turnover plate is attached to the top cover plate and seals the first through hole;
the conductive piece comprises a disconnecting part connected with the turnover piece and a conductive part connected with the first pole piece;
in a normal state, the fusing component is electrically connected between the conductive part and the top cover plate and/or between the conductive part and the turnover sheet; and the flow area of the fusing member is smaller than that of the adjacent region; the conductive part is connected with the disconnecting part, the first pole piece is electrically connected with the first terminal sequentially through the conductive part, the disconnecting part, the turnover piece and the top cover piece, and the second pole piece is electrically connected with the second terminal;
when the pressure in the secondary battery exceeds a reference pressure, the turnover sheet can be turned over to disconnect the disconnection portion, and the turned-over turnover sheet is electrically connected with the connecting member to electrically connect the first terminal and the second terminal.
2. The secondary battery according to claim 1, wherein the fusing member is a flexible conductor, and both ends of the flexible conductor are connected to the conductive part and the flip piece, respectively.
3. The secondary battery of claim 2, wherein the flexible electrical conductor includes an arcuate segment that projects toward the flip piece.
4. The secondary battery according to claim 1, further comprising a first insulating member provided between the conductive member and the top cover sheet, and a fixing member through which the first insulating member is connected to the top cover sheet.
5. The secondary battery according to claim 4, wherein the fixing member includes a body and an extension portion extending from the body toward the conductive portion, the extension portion being connected to the conductive portion, the body being connected to the top cover sheet, and the fusing member being the extension portion.
6. The secondary battery according to any one of claims 1 to 3, wherein the fusing member is electrically connected between the conductive portion and the flip sheet, the flip sheet includes a flip portion and a coupling boss,
the turnover part is of a sheet annular surface structure, and the edge of the turnover part is connected with the top cover plate;
the connecting raised head is connected to the turnover part, protrudes towards the direction of the conductive piece and is electrically connected with the conductive part through the fusing component.
7. The secondary battery of claim 6, wherein the flip piece further comprises a second protrusion protruding in a direction of the first pole piece, and the flip portion is electrically connected to the disconnection portion through the second protrusion in a normal state;
the connecting raised head is connected to the turnover part through the second raised head.
8. The secondary battery according to any one of claims 1 to 3, wherein the cut-off portion includes a thinned region having a thickness smaller than that of the remaining region on the cut-off portion;
in a normal state, the conductive part is connected with the disconnection part through the thinning area;
when the pressure in the secondary battery exceeds a reference pressure, the turning sheet can be turned over so that the disconnection portion is disconnected from the conductive portion at the thinning section.
9. A battery module comprising a plurality of secondary batteries according to any one of claims 1 to 8, wherein the secondary batteries are connected in series.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/105862 WO2018090177A1 (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109792022A CN109792022A (en) | 2019-05-21 |
| CN109792022B true CN109792022B (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680088938.0A Active CN109792022B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Country | Link |
|---|---|
| CN (1) | CN109792022B (en) |
| WO (1) | WO2018090177A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115986285B (en) * | 2018-06-20 | 2024-03-15 | 宁德时代新能源科技股份有限公司 | Output pole piece and battery module |
| 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 |
| CN115863927B (en) * | 2023-02-09 | 2023-05-16 | 深圳海润新能源科技有限公司 | Current collecting component, energy storage device and electric equipment |
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| KR20150099193A (en) * | 2014-02-21 | 2015-08-31 | 삼성에스디아이 주식회사 | Rechargeable battery module |
| KR20150122518A (en) * | 2014-04-23 | 2015-11-02 | 삼성에스디아이 주식회사 | Battery pack |
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- 2016-11-15 WO PCT/CN2016/105862 patent/WO2018090177A1/en active Application Filing
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| CN102270752A (en) * | 2010-06-07 | 2011-12-07 | 三星Sdi株式会社 | Cap assembly and rechargeable battery having the same |
| EP2672548A1 (en) * | 2011-05-17 | 2013-12-11 | LG Chem, Ltd. | Battery pack having improved safety |
| CN102867932A (en) * | 2011-07-06 | 2013-01-09 | Sb锂摩托有限公司 | Rechargeable battery |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018090177A1 (en) | 2018-05-24 |
| CN109792022A (en) | 2019-05-21 |
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