CN114614216A - Secondary battery and battery module - Google Patents
Secondary battery and battery module Download PDFInfo
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- CN114614216A CN114614216A CN202210212263.3A CN202210212263A CN114614216A CN 114614216 A CN114614216 A CN 114614216A CN 202210212263 A CN202210212263 A CN 202210212263A CN 114614216 A CN114614216 A CN 114614216A
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- 230000007306 turnover Effects 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims description 26
- 239000012212 insulator Substances 0.000 claims description 8
- 238000007373 indentation Methods 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009782 nail-penetration test Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application relates to the technical field of energy storage device production, in particular to a secondary battery and a battery module. The secondary battery comprises a first terminal, a second terminal, a top cover plate, an electrode assembly and a turnover plate, wherein the electrode assembly comprises a first pole piece and a second pole piece, and the first terminal is electrically connected with the top cover plate; the second terminal is electrically insulated from the top cover piece, and the flip piece is attached to the second terminal; in a normal state, the first pole piece is electrically connected with the first terminal, and the second pole piece is electrically connected with the second terminal through the turnover piece; when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can turn over to disconnect the electric connection state of the turnover sheet and the second pole piece, and the turnover sheet after turning over is electrically connected with the top cover sheet to electrically connect the first terminal and the second terminal. Even if the automobile is in the running state, the automobile can not be suddenly flameout, and the safety of the automobile is improved.
Description
The present application is a divisional application based on the patent application with the application number of 201680088939.5, the application date of 2016, 11, and 15, the applicant of the Ningde time New energy science and technology Co., Ltd, entitled "Secondary Battery and Battery Module".
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 cover sheet, an electrode assembly, 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;
the first terminal is electrically connected with the top cover sheet; the second terminal is electrically insulated from the top cover sheet, the flip sheet being attached to the second terminal;
in a normal state, the first pole piece is electrically connected with the first terminal, and the second pole piece is electrically connected with the second terminal through the turnover piece;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can be turned over to disconnect the electric connection state of the turnover sheet and the second pole piece, and the turned over turnover sheet is electrically connected with the top cover sheet to electrically connect the first terminal and the second terminal.
Preferably, the second terminal includes a terminal body and an extension portion connected to each other, the extension portion being provided with a first through hole, the flip sheet being attached to the extension portion and sealing 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 turnover part is of a sheet annular surface structure, and the edge of the turnover part is connected with the second terminal;
the first raised head is connected to the overturning part and protrudes towards the direction of the top cover sheet;
and in a normal state, the second pole piece is electrically connected with the extension part through the turnover part.
Preferably, the device further comprises a conducting plate, and in a normal state, the second pole piece is electrically connected with the second terminal through the conducting plate and the turnover piece in sequence;
when the pressure in the secondary battery exceeds the reference pressure, the turnover piece can turn over to disconnect the conducting strip, so that the electric connection state of the second terminal and the second pole piece is disconnected.
Preferably, the conductive sheet comprises 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 to the second pole piece.
Preferably, said thinned area is provided with indentations.
Preferably, the conductive plate further comprises a first insulating member, the first insulating member is located between the conductive plate and the extension portion, and the first insulating member is provided with a second through hole; the turnover sheet, the second through hole and the first conductive part are opposite.
Preferably, the terminal further comprises a resistive member, and the first terminal and the top cover sheet are electrically connected through the resistive member.
Preferably, the capacitor further comprises a first conductive block, wherein the first conductive block is electrically connected with the first terminal contact, and the first conductive block is electrically connected with the top cover sheet through the resistance piece.
Preferably, the first conductive block, the resistive member, and the top cover sheet are stacked.
Preferably, the resistance value of the resistance member is 1-100000 ohms.
Preferably, the first terminal and the top cover sheet are of an integral structure.
A second aspect of the present application provides a battery module including at least two 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:
the utility model provides a secondary battery, the second terminal sets up the upset piece, after the battery takes place to overcharge atmospheric pressure increase messenger upset piece upset back, the upset piece opens electric connection state with the second pole piece, and be connected with top cap piece electricity, the first terminal has been realized, the second terminal electricity is connected, therefore, after the upset piece upset, both realized trouble secondary battery's internal circuit disconnection, the first terminal and the second terminal electric conductance that make this secondary battery simultaneously again lead to, even battery module adopts the tandem mode, this secondary battery can regard as the wire, still keep whole battery module to be in the access state, and thus, even if the car is in the running condition, also can not flameout suddenly, the security of car has been 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;
fig. 9 is a sectional view of still another embodiment of a secondary battery provided herein.
Reference numerals:
10-a top cover sheet;
20-a second 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 first terminal;
31 — a first conductive block;
32-a second insulator;
33-a resistive member;
34-a third seal;
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 first insulator;
73-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 9, the present embodiment provides a secondary battery including a first terminal 30, a second terminal 20, a top cap sheet 10, an electrode assembly (not shown), 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 first terminal 30 is electrically connected to the top cover sheet 10, the second terminal 20 is electrically insulated from the top cover sheet 10, which may be insulated by the third insulating member 22, and the flip sheet 70 is attached to the second terminal 20. In a normal state, the first pole piece is electrically connected with the first terminal 30, and the second pole piece is electrically connected with the second terminal 20 through the turnover piece 70; when the pressure in the secondary battery exceeds the reference pressure, the inverting sheet 70 can be inverted to disconnect the electrical connection state of the inverting sheet 70 with the second terminal, and the inverted inverting sheet 70 is electrically connected with the top cover sheet 10 to electrically connect the first terminal 30 and the second terminal 20.
In the secondary battery of the embodiment, the second terminal 20 is provided with the turnover piece 70, after the turnover piece 70 is turned over due to internal short circuit of the battery, the turnover piece 70 is opened from the second pole piece and is electrically connected with the top cover sheet 10, so that the electrical connection of the first terminal 30 and the second terminal 20 is realized, therefore, after the turnover piece 70 is turned over, the disconnection of an internal circuit of a fault secondary battery is realized, and the electrical conduction of the first terminal 30 and the second terminal 20 of the secondary battery is realized, even if the battery module adopts a series connection mode, the secondary battery can be used as a lead, and the whole battery module is still kept in a closed circuit state, so that the automobile cannot be suddenly flameout even if the automobile is in a running state, and the safety of the automobile is improved.
Generally, the first terminal 30 and the second terminal 20 are mounted to the top sheet 10, respectively. The first and second terminals 30 and 20 may both extend beyond the top cover sheet 10, and particularly, the second terminal 20 is electrically insulated from the top cover sheet 10, and one end of the second terminal 20 extends beyond the top cover sheet 10, as shown in fig. 3, and one end of the first terminal 30 also extends beyond the top cover sheet 10.
In order to ensure the sealing property of the first terminals 30, the second terminals 20 and the top cover sheet 10 when the first terminals 30 or the second terminals 20 protrude out of the top cover sheet 10, the first terminals 30, the second terminals 20 are usually sealed by a sealing member or a sealant, as shown in fig. 4, the second terminals 20 are sealed with the top cover sheet 10 by a second sealing member 24; as shown in fig. 7, the first 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, etc.
Generally, as shown in fig. 3 and 4, the second terminal 20 is provided with a first through hole, and the flip sheet 70 seals the first through hole. The arrangement of the flap 70 is facilitated by the first through-hole.
In order to facilitate the connection of the second terminal 20 and the flip sheet 70, the second terminal 20 includes a terminal body 201 and an extension portion 202 connected to each other, and as shown in fig. 2 to 4, a first through hole is provided in the extension portion 202. Generally, the terminal body 201 is insulated from the top cover plate 10 by the third insulating member 22, and the terminal body 201 is sealed from the top cover plate 10 by the second sealing member 24, and when the second terminal 20 protrudes out of the top cover plate 10, usually one end of the terminal body 201 protrudes out of the top cover plate 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 73, or a sealant, etc., the first sealing member 73 being disposed generally along the outer circumference of the flap 70. When implemented by the first sealing member 73, the first sealing member 73 is disposed along the outer circumference of the flip sheet 70, and the first sealing member 73 may be sealingly connected between the second terminal 20 and the top cover sheet 10 (between the extension portion 202 and the top cover sheet 10 when the extension portion 202 is provided), or the first sealing member 73 may be sealingly connected between the flip sheet 70 and the top cover sheet 10. The first seal 73 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.
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 second terminal 20. The first tab 702 is connected to the flip part 701, and the first tab 702 is connected to a central region of the flip part 701 and protrudes in a direction of the top cover sheet 10, so that the second electrode sheet is electrically connected to the second terminal 20 (the extension part 202 when the extension part 202 is provided) through the flip part 701 in a normal state. By adding the first raised head 702, the distance between the flip sheet 70 and the top cover sheet 10 in the flip direction of the flip sheet 70 can be reduced so that the flip sheet 70 can be rapidly brought into contact with the top cover sheet 10 when overcharging occurs.
In order to reduce the turning stroke of the turning sheet 70 and ensure the connection reliability of the turning sheet 70 and the second 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 is raised towards the direction of the second pole piece, and the turning part 701 is electrically connected with the second pole piece through the second raised head 703 in a normal state.
The end surfaces of the first bosses 702 and the second bosses 703 are also of a planar structure so as to increase the contact area between the flip sheet 70 and the second pole piece and between the flipped flip sheet 70 and the top cover sheet 10, 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 second pole piece and the top cover piece 10 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 engaged with a stepped surface of the stepped hole, and when only the flip portion 701 is provided, the flip portion 701 may be engaged with the stepped surface, which may restrict the position of the flip sheet 70, and prevent the flip sheet 70 from being unable to contact with the top cover sheet 10 after being flipped due to loose connection between the flip sheet 70 and the second terminal 20 in a 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 second electrode sheet is electrically connected to the second terminal 20 through the conductive sheet 71 and the flip sheet 70 in sequence; when the pressure in the secondary battery exceeds the reference pressure, the turnover piece 70 can be turned over to disconnect the conductive piece 71, thereby disconnecting the electrical connection state of the second terminal 20 and the second pole piece, and the processing and assembly are facilitated by adding the conductive piece 71.
Generally, the conductive sheet 71 is provided with a vent hole opposite to the flip sheet 70, such as the first vent hole 714 or the second vent hole 715 in fig. 6, 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.
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 second pole piece. In a normal state, the flip chip 70 is electrically connected to the second electrode chip 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 chip 70 and the second conductive part 713 to the second electrode piece, when the flip chip 70 is flipped, the conductive sheet 71 can be quickly broken at the thinned region 712, thereby quickly achieving the disconnection in the secondary battery.
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, may be the same through hole as the first ventilation hole 714.
In order to prevent the conductive sheet 71 from being electrically connected to the first terminal 20, the contact portion between the conductive sheet 71 and the first terminal 20 is implemented by an insulating structure, an insulating glue or an insulating varnish, the insulating structure may be a first insulating member 72 as shown in fig. 4, the first insulating member 72 is located between the conductive sheet 71 and the flip sheet 70, the first insulating member 72 is provided with a second through hole, and the flip sheet 70, the second through hole and the first conductive portion 711 are opposite to each other. The first insulator 72 and the third insulator 22 may be an integral structure.
The second conductive part 713 can be fixed with the second terminal 20 by means of bonding, screws and the like, and in order to better fix the conductive sheet 71 and further ensure that the turnover sheet 70 can be electrically disconnected with the conductive sheet after being turned over, the conductive sheet 71 can be fixed with the first terminal 20 by the first insulating member 72, and in this way, the first insulating member 72 can simultaneously play a role in insulation and fixation, so that the number of parts is reduced, and the assembly process is simplified.
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 of the second terminal 20 to the outside, the secondary battery further includes a second conductive block 21, and the second conductive block 21 is electrically insulated from the second terminal 20, which may be insulated by a fourth insulating member 23, an insulating paste, or an insulating varnish.
The electrical connection between the first terminal 30 and the top cover sheet 10 can be directly connected to the top cover sheet 10, as shown in fig. 9, at this time, the first terminal 30 and the top cover sheet 10 can be integrated into a whole, thereby increasing the reliability of the electrical connection between the two; or connected to the top cover plate 10 through a conductive structure, at this time, a second insulating member 32 is disposed between the top cover plate 10 and the first terminal, the conductive structure may be a conductive block, as shown in fig. 7, it is a first conductive block 31, the first conductive block 31 is in contact with and electrically connected to the first terminal 30, that is, the first terminal 30 is connected to the top cover plate 10 through the first conductive block 31, wherein the first terminal 30 and the top cover plate 10 may be in direct contact and electrically connected, or may not be in direct contact and electrically connected, and are connected through a transition member; as shown in fig. 8, the first terminal 30 and the first conductive block 31 may be connected to both sides of the top cover sheet 10, respectively, in the latter two ways, which facilitate the electrical connection of the secondary battery to the outside.
Furthermore, the secondary battery further comprises a resistance member 33, the first terminal 30 is electrically connected with the top cover sheet 10 through the resistance member 33, and the current of a short circuit loop can be reduced by adding the resistance member 33 when the secondary battery is subjected to a nail penetration test, so that the safety of the nail penetration is ensured.
When the first conductive piece 31 is not in contact electrical connection with the top cover sheet 10, the first conductive piece 31 is electrically connected with the top cover sheet 10 through the resistive member 33. The resistive member 33 may have a pillar structure or a sheet structure, and in the case of the sheet structure, the first conductive pad 31, the resistive member 33, and the top cover sheet 10 may be stacked as shown in fig. 7, so as to increase the reliability of connection. When the structure is a columnar structure, the first conductive block 31 and the top cover sheet 10 are electrically insulated by a fifth insulating piece or insulating paint or insulating glue, after the resistance piece 33 passes through the fifth insulating piece, two ends of the resistance piece are respectively electrically connected with the top cover 10 and the first conductive block 31, at this time, the top cover sheet 10 can be provided with a first groove, and one end of the resistance piece 33, which is electrically connected with the top cover sheet 10, is inserted into the first groove; the first conductive block 31 is provided with a second groove, and the other end of the resistance member 33 is inserted into the second groove to prevent the dislocation of the resistance member 33; of course, it is also possible that only the top cover sheet 10 is provided with the first groove, or that the first conductive block 31 is provided with the second groove.
In order to minimize damage to the piercing pin, the resistive element 33 typically has a resistance of 1 to 100000 ohms, such as 1 ohm, 100 ohm, 1000 ohm, 100000 ohm.
In the above embodiments, the first terminal 30 is a positive terminal, the second terminal 20 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 electrolyte from corroding the case. Of course, the first terminal 30 may be a negative terminal, the second terminal 20 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 (16)
1. A secondary battery is characterized by comprising a first terminal, a second terminal, a top cover sheet, an electrode assembly 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;
the first terminal is electrically connected with the top cover sheet; the second terminal is electrically insulated from the top cover sheet, the flip sheet being attached to the second terminal;
in a normal state, the first pole piece is electrically connected with the first terminal, and the second pole piece is electrically connected with the second terminal through the turnover piece;
when the pressure in the secondary battery exceeds the reference pressure, the turnover sheet can be turned over to disconnect the electric connection state of the turnover sheet and the second pole piece, and the turned over turnover sheet is electrically connected with the top cover sheet to electrically connect the first terminal and the second terminal.
2. The secondary battery according to claim 1, wherein the second terminal comprises a terminal body and an extension portion connected to each other, the extension portion being provided with a first through hole, the flip sheet being attached to the extension portion and sealing the first through hole.
3. The secondary battery according to claim 2, 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.
4. The secondary battery of claim 3, 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.
5. The secondary battery of claim 3, 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.
6. The secondary battery according to claim 2, wherein the flip sheet includes a flip portion and a first tab,
the turnover part is of a sheet annular surface structure, and the edge of the turnover part is connected with the second terminal;
the first raised head is connected to the overturning part and protrudes towards the direction of the top cover sheet;
and in a normal state, the second pole piece is electrically connected with the extension part through the turnover part.
7. The secondary battery of claim 2, further comprising a conductive sheet, wherein in a normal state, the second pole piece is electrically connected with the second terminal through the conductive sheet and the flip piece in sequence;
when the pressure in the secondary battery exceeds the reference pressure, the turnover piece can turn over to disconnect the conducting strip, so that the electric connection state of the second terminal and the second pole piece is disconnected.
8. The secondary battery according to claim 7, 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 to the second pole piece.
9. The secondary battery of claim 8, wherein the thinned region is provided with indentations.
10. The secondary battery according to claim 8, further comprising a first insulator between the conductive sheet and the extension, the first insulator being provided with a second through hole; the turnover sheet, the second through hole and the first conductive part are opposite.
11. The secondary battery according to any one of claims 2 to 10, further comprising a resistive member through which the first terminal and the top lid sheet are electrically connected.
12. The secondary battery of claim 11, further comprising a first conductive mass electrically connected to the first terminal contact, the first conductive mass being electrically connected to the top cover sheet through the resistive member.
13. The secondary battery according to claim 12, wherein the first conductive piece, the resistive member, and the top lid sheet are stacked.
14. The secondary battery according to claim 11, wherein the resistance member has a resistance value of 1 to 100000 ohms.
15. The secondary battery according to any one of claims 1 to 10, wherein the first terminal is of an integral structure with the top cover sheet.
16. A battery module comprising at least two secondary batteries according to any one of claims 1 to 15, the secondary batteries being connected in series with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210212263.3A CN114614216B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/105860 WO2018090176A1 (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
| CN201680088939.5A CN109844993B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
| CN202210212263.3A CN114614216B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201680088939.5A Division CN109844993B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Publication Number | Publication Date |
|---|---|
| CN114614216A true CN114614216A (en) | 2022-06-10 |
| CN114614216B CN114614216B (en) | 2024-04-02 |
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| CN202210212263.3A Active CN114614216B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
| CN201680088939.5A Active CN109844993B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201680088939.5A Active CN109844993B (en) | 2016-11-15 | 2016-11-15 | Secondary battery and battery module |
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| Country | Link |
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| CN (2) | CN114614216B (en) |
| WO (1) | WO2018090176A1 (en) |
Cited By (1)
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| CN115939691A (en) * | 2023-02-09 | 2023-04-07 | 深圳海润新能源科技有限公司 | End cover assembly, energy storage device and electric equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950431A (en) * | 2019-02-28 | 2019-06-28 | 天津力神电池股份有限公司 | A kind of band overcharges the battery battery core with the battery cover board of short-circuit protection and its application |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109844993B (en) | 2022-04-01 |
| WO2018090176A1 (en) | 2018-05-24 |
| CN114614216B (en) | 2024-04-02 |
| CN109844993A (en) | 2019-06-04 |
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