CN109792031B - Secondary battery - Google Patents
Secondary battery Download PDFInfo
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- CN109792031B CN109792031B CN201680088924.9A CN201680088924A CN109792031B CN 109792031 B CN109792031 B CN 109792031B CN 201680088924 A CN201680088924 A CN 201680088924A CN 109792031 B CN109792031 B CN 109792031B
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- terminal
- contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A secondary battery, comprising: an electrode assembly (31), a first terminal (11), a second terminal (21), and a top lid sheet (41), the electrode assembly (31) including a first pole piece, a second pole piece, and a separator disposed between the first pole piece and the second pole piece, the first pole piece being electrically connected to the first terminal (11), the second pole piece being electrically connected to the second terminal (21), the secondary battery further including: a resistance member (24), a contact piece (12) attached to the first terminal (11), and a conductive piece (22) electrically connected to the second terminal (21), wherein the top cover piece (41) is electrically connected to the first terminal (11) at all times through the resistance member (24), and is provided in an insulated manner from the second terminal (21) and the conductive piece (22); when the internal pressure of the secondary battery exceeds the reference pressure, the contact piece (12) acts under the action of air pressure and is in contact with the conducting strip (22) to form an electric connection path passing through the first pole piece, the first terminal (11), the contact piece (12), the conducting strip (22), the second terminal (21) and the second pole piece.
Description
Technical Field
The application relates to the technical field of energy storage devices, in particular to a secondary battery.
Background
Electric vehicles, energy storage power stations, and the like generally require the use of secondary batteries having a large capacity as power sources. These secondary batteries should have good safety to meet the use standards and meet the demands of people, in addition to having high capacity.
On one hand, when the secondary battery is penetrated by a conductor from the outside, a short circuit between the positive plate and the negative plate exists in the battery cell, at this time, a resistor is usually arranged between the top cover plate and the pole, and the resistance value of the resistor is usually larger, so as to reduce the short circuit current passing through the positive plate and the negative plate, so as to prevent the battery cell from being out of control.
On the other hand, when the secondary battery is in a rapid charging or high-power discharging process, the interior of the secondary battery generates excessive heat and the electrolyte may decompose, and the pressure inside the secondary battery is increased due to the generation of the heat and the decomposition of the electrolyte, which may cause the secondary battery to catch fire and explode.
However, the two aspects mentioned above are contradictory in selecting the resistance value of the resistor, and on one hand, the resistor is required to be large to reduce the short circuit, and on the other hand, the resistor is required to be small to fuse the fuse part by the short circuit current.
In the related art, the above-mentioned contradiction can also be solved by providing two contact pieces in the secondary battery, but this requires high consistency in the operation of the two contact pieces, which otherwise lowers the safety of the secondary battery if one of the two contact pieces fails to operate.
Disclosure of Invention
Embodiments of the present application provide a secondary battery, which can solve the above-mentioned contradiction and improve the safety of the secondary battery.
The present application provides a secondary battery including: an electrode assembly, a first terminal, a second terminal, and a top cover sheet,
the electrode assembly includes a first pole piece electrically connected to the first terminal, a second pole piece electrically connected to the second terminal, and a separator disposed between the first pole piece and the second pole piece,
the secondary battery further includes: a resistance member, a contact piece attached to the first terminal, and a conductive piece electrically connected to the second terminal,
the top cover sheet is electrically connected with the first terminal all the time through the resistance component and is arranged in an insulating way with the second terminal and the conducting strip;
when the internal pressure of the secondary battery exceeds a reference pressure, the contact piece acts under the action of air pressure and contacts with the conductive sheet to form an electrical connection path through the first pole piece, the first terminal, the contact piece, the conductive sheet, the second terminal and the second pole piece.
Preferably, the electrode assembly further comprises a shell, the top cover sheet and the shell cover to form a first cavity for packaging the electrode assembly and a second cavity for providing an action space for the contact sheet,
the first chamber is separated from the second chamber by the contact sheet, and the conductive sheet is located on one side of the top cover sheet away from the electrode assembly.
Preferably, the top cover plate is provided with a through hole, the conductive plate is provided with a contact part capable of contacting with the contact piece after action, and the contact part is positioned in the second cavity.
Preferably, the top cover sheet includes a body portion and a raised portion that projects toward a side away from the housing, the second chamber is surrounded by the contact piece and the raised portion, and the through hole is provided on the raised portion.
Preferably, the first terminal includes a terminal body and an extension portion connected,
an opening is formed in the extending portion, the opening faces the through hole, and the contact piece seals the opening to separate the first cavity from the second cavity.
Preferably, the terminal body and the extension part are of an integral structure or a split structure.
Preferably, the lid further comprises a sealing member sealed between the first and second chambers, the sealing member being sealingly connected between the extension and the top lid sheet and having a first sealing face in sealing contact with the top lid sheet and a second sealing face in sealing contact with the extension.
Preferably, the sealing member is sealed between the first chamber and the second chamber, the sealing member is sealed between the contact sheet and the top cover sheet, and has a first sealing face in sealing contact with the top cover sheet and a second sealing face in sealing contact with the contact sheet.
Preferably, the first sealing surface and the second sealing surface are arranged opposite to each other in the extension direction of the top sheet, and/or
The first sealing surface and the second sealing surface are disposed opposite to each other in a height direction of the secondary battery.
Preferably, the contact piece comprises an overturning part and a raised head,
the turning part is of a sheet-shaped ring surface structure,
the raised head is connected with the turnover part and protrudes towards one side of the top cover plate,
the outer edge of the turnover part is connected with the extending part in a sealing mode, and the contact piece can be contacted with the contact part through the raised head when acting.
Preferably, the electric connector further comprises a first terminal plate, the first terminal is electrically connected with the first terminal plate, and the resistance member is connected in series between the first terminal plate and the top cover plate.
Preferably, the resistive member has a first end and a second end,
the top cover sheet is provided with a first concave part, the first end is embedded in the first concave part,
and/or
The first terminal board is provided with a second concave part, and the second end is embedded in the second concave part.
Preferably, the resistance value of the resistance member ranges from 2 ohms to 200000 ohms.
Preferably, the fuse structure is connected in series in an electrical connection path through the first pole piece, the first terminal, the contact piece, the conductive piece, the second terminal and the second pole piece, and an overcurrent area at the fuse structure is smaller than that at the rest of the electrical connection path; and is
The fusing component is connected in series between the first pole piece and the first terminal, and/or
The fusing member is connected in series between the second pole piece and the second terminal.
Preferably, the device also comprises a first connecting piece and a second connecting piece,
the first pole piece is electrically connected with the first terminal through the first connecting piece, the second pole piece is electrically connected with the second terminal through the second connecting piece,
the fusing member is formed on the first connecting member and/or the second connecting member.
Preferably, the fuse member is formed by providing a notch and/or a hole in the first connecting member and/or the second connecting member
The technical scheme provided by the application can achieve the following beneficial effects:
a secondary battery includes a top cover sheet, first and second terminals, a contact sheet, a conductive sheet, and a resistance member. The contact piece is attached to the first terminal, the conductive piece is electrically connected to the second terminal, and the top cover piece is electrically connected to the first terminal via the resistance member and is provided in insulation from the second terminal and the conductive piece. When the air pressure in the secondary battery is increased and exceeds the reference pressure, the contact piece acts under the action of the air pressure and is in contact with the conducting strip, so that an electric connection path passing through the first pole piece, the first terminal, the contact piece, the conducting strip, the second terminal and the second pole piece is formed, in the electric connection path, the first pole piece and the second pole piece are in short circuit, and the risk of ignition or explosion of the secondary battery is reduced; in addition, when the secondary battery is penetrated by the external conductor, the secondary battery forms an electric connection path passing through the second pole piece, the conductor, the top cover plate, the resistance member, the first terminal, the first pole piece and the second pole piece, and in the electric connection path, the resistance member reduces the short-circuit current in the path and reduces the probability of larger accidents of the secondary battery. In the application, the electric connection path formed after the contact piece is contacted with the conducting strip and the electric connection path where the resistance component is located belong to two different paths respectively, so that the contradiction when the resistance is set is solved, the secondary battery is protected in two aspects, and the safety of the secondary battery is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is an exploded perspective view of a part of a structure of a secondary battery provided in an embodiment of the present application;
fig. 2 is a sectional view of a partial structure of a secondary battery provided in an embodiment of the present application;
fig. 3 is a cross-sectional view of an exploded view of a first terminal and a contact blade provided in accordance with an embodiment of the present application;
fig. 4 is a cross-sectional view of a first terminal and a contact piece connected to each other according to an embodiment of the present disclosure;
FIG. 5 is an enlarged view of portion A of FIG. 2;
FIG. 6 is a schematic view of a first embodiment of a sealing structure provided by an embodiment of the present application to seal between a first chamber and a second chamber;
FIG. 7 is a schematic view of a second embodiment of a sealing structure provided by embodiments of the present application to seal between a first chamber and a second chamber;
fig. 8 is a schematic view of a third embodiment of a sealing structure that is provided in the embodiments of the present application and seals between a first chamber and a second chamber.
Reference numerals:
11-a first terminal;
111-a terminal body;
112-an extension;
112 a-opening;
112 b-columns;
112 c-step surface;
12-a contact pad;
121-nose;
121 a-second contact plane;
122-a turning part;
13-a sealing member;
131-a first sealing surface;
132-a second sealing surface;
14-a fuse member;
15-a first terminal board;
16-a first connector;
17-a first insulating pad;
21-a second terminal;
22-a conductive sheet;
221-a contact portion;
221 a-first contact plane;
23-an insulating member;
231-holes;
24-a resistive member;
25-a second terminal plate;
26-a second connector;
27-a second insulating liner;
41-top cover sheet;
411-a body portion;
412-a raised portion;
413-through hole.
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. The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings. The terms "front", "rear", "left", "right", "upper" and "lower" are used herein with reference to the state of the secondary battery in the drawings.
As shown in fig. 1 to 8, the present embodiment provides a secondary battery, which includes a first terminal 11 and a second terminal 21, the first terminal 11 and the second terminal 21 can be connected to an external circuit to form a current loop, and the secondary battery serves as a power source in the external circuit and outputs electric energy to the external.
The first terminal 11 can be used as a positive terminal, and the second terminal 21 can be used as a negative terminal, or vice versa. Next, the secondary battery provided in the present application will be described in detail by taking the first terminal 11 as a positive terminal (the first pole piece is a positive pole piece) and the second terminal 21 as a negative terminal (the second pole piece is a negative pole piece) as examples.
As shown in fig. 1, a secondary battery generally includes an electrode assembly and a case (neither of which is shown) and a top lid piece 41, the case and the top lid piece 41 may be covered by welding or the like to form a receiving chamber, and the electrode assembly is received in the receiving chamber.
The electrode assembly generally includes a first pole piece having a first tab thereon and a second pole piece having a second tab thereon, the first pole piece being electrically connected to the first terminal 11 via the first tab, and the second pole piece being electrically connected to the second terminal 21 via the second tab, so that electric energy is finally output from the electrode assembly to the outside.
As shown in fig. 1, the secondary battery provided by the embodiment of the present application further includes a conductive sheet 22, a contact sheet 12, and a resistance member 24.
On the one hand, the contact piece 12 is attached to the first terminal 11, the conductive sheet 22 is electrically connected to the second terminal 21, and when the internal pressure of the secondary battery exceeds the reference pressure, the contact piece 12 is operated by the air pressure and brought into contact with the conductive sheet 22 to form an electrical connection path through the first pole piece, the first terminal 11, the contact piece 12, the conductive sheet 22, the second terminal 21, and the second pole piece.
The contact piece 12 and the first terminal 11 may be an integral structure or a split structure; the conductive sheet 22 and the second terminal 21 may be electrically connected by directly contacting and connecting them, or the conductive sheet 22 may be connected to the second terminal 21 by another conductive body, which is not limited in the present application as long as the conductive sheet 22 and the second terminal 21 can conduct current.
The contact sheet 12 is operated by air pressure and contacted with the conductive sheet 22, which may be direct contact between the two, or other conductive bodies may be arranged between the contact sheet 12 and the conductive sheet 22, so that the contact sheet 12 and the conductive sheet 22 are indirectly contacted.
According to the above description, when the inside of the secondary battery excessively generates heat or the electrolyte is decomposed during the charge and discharge of the secondary battery, and thus the pressure inside the battery is increased, and the internal pressure exceeds the reference pressure, the contact piece 12 acts by the air pressure and contacts the conductive piece 22, so that the secondary battery forms an external short circuit state, thereby reducing the risk of explosion and ignition of the secondary battery, and improving the safety of the secondary battery.
On the other hand, the top cover 41 is electrically connected to the first terminal 11 through the resistance member 24 at all times, and the top cover 41 is provided to be insulated from the second terminal 21 and the conductive sheet 22.
When the secondary battery is penetrated by the conductor (for example, during a nail penetration test), so that short circuit occurs between the first pole piece and the second pole piece, the short circuit current flows through the second pole piece, the conductor, the top cover plate 41, the resistance member 24, the first terminal 11 and the first pole piece, and the short circuit current can be obviously reduced due to the arrangement of the resistance member 24, so that the probability of more dangerous accidents such as thermal runaway and the like of the secondary battery is reduced, and the safety of the secondary battery is improved.
Through the arrangement of the two aspects, the electric connection path formed by the contact piece 12 contacting with the conducting strip 22 and the electric connection path of the resistance member 24 belong to two different short circuit paths respectively, so that the contradiction when the resistance is arranged is solved, the secondary battery is protected in two aspects, and the safety of the secondary battery is improved.
As shown in fig. 2, the secondary battery further includes a first terminal plate 15, and the first terminal plate 15 is electrically connected to the first terminal 11, and in this case, the resistance member 24 may be connected in series between the first terminal plate 15 and the top cap sheet 31, so that a short-circuit current flows through the top cap sheet 31, the resistance member 24, the second terminal plate 25, and the second terminal 21.
Accordingly, a second terminal plate 25 may be further included in the secondary battery, and the conductive sheet 22 is electrically connected to the second terminal 21 via the second terminal plate 25. The first terminal plate 15 and the second terminal plate 25 are provided to facilitate connection between the first terminal 11 and the second terminal 21 and an external circuit, and are provided for easy assembly, but are not necessarily provided.
In the above case, the resistance member 24 may be a columnar resistance, and the resistance member 24 may be directly fixed between the first terminal board 15 and the top cover sheet 41, thereby facilitating the arrangement of the resistance member 24.
Specifically, according to one embodiment, as shown in fig. 2, the resistance member 24 has a first end and a second end along the axial direction thereof, the top cover sheet 41 is opened with a first recess, the first end of the resistance member 24 is embedded in the first recess, and the second end abuts against the first terminal board 15, so that the resistance member 24 can be reliably fixed in the first recess.
According to another embodiment, a second recess may be formed in the first terminal board 15, and the second end of the resistance member 24 may be embedded in the second recess, and the first end of the resistance member 24 may abut against the top cover sheet 41, so that the resistance member 24 may be fixed reliably.
In addition, the above two embodiments may be combined, that is, the top cover plate 41 is opened with a first concave portion, the first terminal plate 15 is opened with a second concave portion, and the first end and the second end of the resistance member 24 are respectively embedded in the first concave portion and the second concave portion. Thus, both ends of the resistance member 24 are simultaneously restrained, and the reliability of the electrical connection between the resistance member and the first terminal board 15 and the top lid piece 41 is further improved.
It is noted that the end of the first terminal 11 remote from the top cover plate 31 is electrically connected to the top cover plate 31 via the first terminal board 15 and the resistive member 24, and the end close to the top cover plate 31 is insulated from the top cover plate 31 by the first insulating gasket 17 to form the desired electrical connection path.
It will be understood by those skilled in the art that when the secondary battery is normally operated, a normal current flows through the first terminal plate 15, the first terminal 11, and the first pole piece in this order, although the resistance member 24 exists, without affecting the output of the secondary battery in the normal operation.
The resistance of the resistance member 24 can be selected from 2 ohm to 200000 ohm, the resistance member 24 can be selected from high temperature resistance, such as silicon carbide resistance and conductive ceramic, the resistance of the silicon carbide resistance is 10 ohm, the highest bearing temperature is more than 600 ℃, and the resistance of the conductive ceramic is 500 ohm. Further, the resistance member 24 may also take a ring-like structure and be fitted over the first terminal 11.
In general, a portion of each of the first terminal 11 and the second terminal 21 protrudes out of the top cover sheet 41, and the protruding portions are connected to an external circuit. In some embodiments, the first terminal 11 may not necessarily extend out of the top cover sheet 41, for example, in the embodiment where the first terminal 11 is used as a positive terminal, the first terminal 11 may be electrically connected to an external circuit via the top cover sheet 41. Further, when the top cover sheet 41 is electrically connected to the first terminal 11 serving as the positive electrode, the case and the top cover sheet 41 are both positively charged, corrosion of the case and the top cover sheet 41 by the electrolyte can be reduced, and the service life can be prolonged.
As shown in fig. 2, more specifically, the accommodating cavity formed by the housing and the top cover plate 41 after being covered comprises a first cavity S1 and a second cavity S2. Specifically, the first chamber S1 is for enclosing the electrode assembly, the second chamber S2 is for providing an action space for the contact piece 12, and the first chamber S1 is separated from the second chamber S2 by the contact piece 12. When the internal pressure of the first chamber S1 exceeds the reference pressure, the gas pressure acts on the contact piece 12 and pushes it to operate.
The actuated contact tab 12 is able to make electrical contact with the conductive tab 22, wherein the conductive tab 22 is located on the side of the top cover sheet 41 remote from the electrode assembly. The conductive sheet 22 may be entirely located inside the second chamber S2, or entirely located outside the second chamber S2. When the conductive sheet 22 is entirely located outside the second chamber S2, the heat generated when the contact sheet 12 is in electrical contact with the conductive sheet 22 can be more easily conducted and dispersed.
In the embodiment shown in fig. 2, a portion of the conductive strip 22 is disposed within the second chamber S2, and the remaining portion is disposed outside the second chamber S2, which is both convenient for heat dissipation and convenient for making electrical contact with the contact strip 12.
Specifically, as shown in fig. 1-2, the contact piece 12 is attached to the first terminal 11, the conductive piece 22 is disposed above the top cover plate 41 and connected to the second terminal 21, the conductive piece 22 extends from the second terminal 21 toward one side of the first terminal 11, the top cover plate 41 is formed with a through hole 413, the conductive piece 22 has a protruding portion protruding toward the contact piece 12, the protruding portion is a contact portion 221 electrically contacting with the actuated contact piece 12, the contact portion 221 extends into the through hole 413 and is located in the second chamber S2, the provision of the contact portion 221 facilitates heat dissipation of the conductive piece 22 and provision of a space between the conductive piece 22 and the contact piece 12, the space enables mutual contact between the two at the actuation of the contact piece 12 and mutual insulation before the actuation of the contact piece 12.
Further, according to one embodiment, as shown in fig. 3-4, contact sheet 12 includes a protrusion 121 and a flip portion 122, wherein flip portion 122 is a sheet-like ring surface structure, which facilitates the action of contact sheet 12 under the action of air pressure, and protrusion 121 is connected to flip portion 122 and protrudes toward one side of top cover sheet 41, and when contact sheet 12 is actuated, contact sheet 12 can contact with contact portion 221 through protrusion 121. In this embodiment, the projection 121 is provided to reduce the stroke of the contact piece 12 with a suitable space from the contact portion 221, thereby improving the safety of the secondary battery. Further, the tab 121 and the turnover part 122 may be a unitary structure.
And further, as shown in fig. 5, the contact portion 221 has a first contact plane 221a, and correspondingly, the projection 121 has a second contact plane 121a, and when the contact piece 12 is brought into contact with the conductive sheet 22, the first contact plane 221a is brought into electrical contact with the second contact plane 121 a. This arrangement allows the contact plate 12 to have a larger contact area when contacting the conductive plate 22, so as to ensure reliable electrical contact therebetween.
As for the conductive sheet 22, the conductive sheet 22 is fixed, and a surface of the contact portion 221 on a side facing the contact piece 12 serves as a first contact plane 221 a. In the case of the contact sheet 12, the contact sheet 12 is deformed after the action, and considering that the amount of deformation at the projection 121 is relatively small, the surface of the projection 121 facing the conductive sheet 22 is kept in a substantially planar state, and therefore, the surface of the projection 121 facing the conductive sheet 22 can be regarded as a second contact plane 121 a.
In the embodiment shown in fig. 1-2, one end of the conductive plate 22 is connected to the second terminal 21, and the other end extends toward one side of the first terminal 11, so that the conductive plate 22 has a cantilever structure with one fixed end and the other free end, and during the contact with the contact pad 12, the conductive plate 22 is displaced by the contact force, resulting in poor contact between the two. In order to overcome the above-mentioned drawbacks, it is preferable to provide a connection structure at the free end of the conductive plate 22 to fix the free end of the conductive plate 22, and the connection structure may be implemented by an adhesive structure or a mutually-fitted engagement structure.
As shown in fig. 2, the secondary battery includes an insulating member 23, the insulating member 23 covers the conductive sheet 22, and one end of the insulating member 23 is fixed at the second terminal 21, on one hand, the insulating member 23 covers the conductive sheet 22 to enable the conductive sheet 22 and the second terminal to be embedded together, the insulating member 23 extends towards the first terminal 11 and is fixed at the first terminal 11, and after the arrangement, the cantilever structure of the conductive sheet 22 is relieved by the support of the insulating member 23, and the phenomenon of poor contact between the conductive sheet 22 and the contact sheet 12 is reduced.
On the other hand, by the coating of the insulating member 23, only the contact portion 221 contacting the contact piece 12 and the portion electrically connected to the second terminal 21 are exposed from the conductive sheet 22, thereby preventing conduction with the top cover sheet 41 and insulating the conductive sheet 22 from the top cover sheet 41.
The second terminal 21 is insulated from the top cover plate 41 by a second insulating spacer 27. Wherein, the insulating material can be selected from rubber, asbestos and the like.
Accordingly, as shown in fig. 1, the insulating member 23 is further provided with a hole 231 for the resistance member 24 to pass through, so as to achieve the conduction between the resistance member 24 and the top cover plate 41 and the first terminal board 15.
As shown in fig. 3-4, the first terminal 11 includes a terminal body 111 and an extending portion 112 connected to each other, the extending portion 112 extends toward one side of the second terminal 21, an opening 112a is formed in the extending portion 112, an outer edge of the flip portion 122 is hermetically connected to the extending portion 112, so that the contact piece 12 seals the opening 112a and separates the first chamber S1 from the second chamber S2, the opening 112a is aligned with the through hole 413 of the top cover sheet 41, and the protrusion 121 is disposed in a middle portion of the flip portion 122, so that when the contact piece 12 is operated, the protrusion 121 contacts with the contact portion 221 through the opening 112a and the through hole 413. The portion for electrically connecting the pole piece and the external circuit is located on the terminal body 111, and the extension portion 112 is used for connecting the contact piece 12, so that the contact piece 12 is conveniently arranged on the first terminal 11.
In the embodiment shown in fig. 3-4, the terminal body 111 and the extending portion 112 are an integral structure, but it should be noted that, in some other embodiments, the terminal body 111 and the extending portion 112 may also be a split structure, which is not limited in this application.
As shown in fig. 3-4, a cylindrical body 112b extends from the extension portion 112 to a side close to the top cover plate 41, the cylindrical body 112b has a cavity extending along an axial direction thereof, and the cavity penetrates the extension portion 112, and an opening 112a is formed in the cavity. The inner wall of the cylindrical body 112b has a stepped structure, a stepped surface 112c is formed on the inner wall of the cylindrical body 112b, the stepped surface 112c is positioned in contact with the outer edge surface of the turnover part 122, and after positioning and matching, the two can be fixed by butt welding or bonding to realize sealing connection.
In addition, in order to ensure that the contact piece 12 rapidly responds to the internal pressure of the secondary battery, the secondary battery further includes a sealing member 13 sealed between the first chamber S1 and the second chamber S2. According to one embodiment, as shown in fig. 2, the sealing member 13 is sealingly connected between the extension 112 and the top lid sheet 41, and the sealing member 13 has a first sealing surface 131 in sealing contact with the top lid sheet 41 and a second sealing surface 132 in sealing contact with the extension 112.
Specifically, the sealing member 13 is of an annular structure, the sealing member 13 is sleeved outside the cylindrical body 112b, the cylindrical body 112b is embedded in the through hole 413 together with the sealing member 13, and the sealing member 13 is in sealing contact with the inner wall of the through hole 413 and the outer wall of the cylindrical body 112b, so that the sealing member 13 forms the first sealing surface 131 and the second sealing surface 132 which are oppositely arranged along the extending direction of the top cover sheet 41.
Further, as shown in fig. 6, the sealing member 13 may be further disposed around the through hole 413 and the opening 112a, when the sealing member 13 is in sealing contact with the top lid sheet 41 and the extension 112, respectively, that is, the first sealing surface 131 and the second sealing surface 132 are formed to be oppositely disposed in the height direction of the secondary battery.
In other embodiments, as shown in fig. 7, the sealing member 13 may also be sealingly connected between the contact piece 12 and the top cover piece 41, and the sealing member 13 has a first sealing surface 131 sealingly contacting the top cover piece 41 and a second sealing surface 132 sealingly contacting the contact piece 12, and the first sealing surface 131 and the second sealing surface 132 are disposed opposite to each other in the height direction of the secondary battery.
In the embodiment shown in fig. 7, as long as the top cover sheet 41, the extending portion 112 and the contact sheet 12 are slightly modified, the first sealing surface 131 and the second sealing surface 132 may be disposed opposite to each other along the extending direction of the top cover sheet 41, and the principle of the sealing structure is substantially the same as that of the sealing structure shown in fig. 2, and will not be described again here.
In addition, as shown in fig. 8, a plastic member disposed between the first terminal 11 and the top cap sheet 41 may be used as the sealing member 13, which may reduce the number of parts used in the secondary battery and simplify the assembly process.
As shown in fig. 2, since the space of the second chamber S2 formed after the housing and the top cover sheet 41 are closed is limited, the operation space of the contact piece 12 is limited, and in order to increase this space, it is preferable that the top cover sheet 41 includes a body portion 411 and a raised portion 412, the raised portion 412 protrudes toward the side away from the housing, so that the second chamber S2 is surrounded by the contact piece 12 and the raised portion 412, and the through hole 413 is provided on the raised portion 412. In this way, the space of the second chamber S2 is expanded, and the expanded space is advantageous in that when the contact 12 is operated, the air compression ratio in the space is reduced, the resistance when the contact 12 is operated is reduced, and the sensitivity when the contact 12 is operated is improved.
The present application further includes a fuse member 14, as shown in fig. 1, the fuse member 14 is connected in series in an electrical connection path through the first pole piece, the first terminal 11, the contact piece 12, the conductive sheet 22, the second terminal 21, and the second pole piece, and an overcurrent area of the fuse member 14 is smaller than an overcurrent area of the rest of the electrical connection path. The fuse member 14 may be connected in series between the first pole piece and the first terminal 11, or the fuse member 14 may be connected in series between the second pole piece and the second terminal 21, or two fuse members 14 are provided, one of which is connected in series between the first pole piece and the first terminal 11, and the other is connected in series between the second pole piece and the second terminal 21. By the arrangement of the fusing member 14, it is possible to fuse at the fusing member 14 when a large current is short-circuited in the electrical connection path, thereby achieving disconnection between the electrode assembly 31 and an external circuit and reducing the risk of ignition and explosion of the secondary battery.
The fuse member 14 may be implemented by forming a notch or a hole on the first connecting member 16, so that an area of flow formed on the first connecting member 16 is smaller than that of the rest, and the smaller area is the location of the fuse member 14.
Similarly, the manner of forming fuse member 14 on second connecting member 26 may adopt the above-described structure, and will not be described in detail herein.
It should be noted that the fuse member 14 and the resistance member 24 can be connected in series in an electrical connection path passing through the first pole piece, the first terminal 11, the contact piece 12, the conductive piece 22, the second terminal 21 and the second pole piece, and the resistance member 24 can reduce the short-circuit current at the moment of contact between the contact piece 12 and the conductive piece 22, but the reduced short-circuit current is enough to fuse the fuse member 14, so as to break the electrical connection path.
Although the above description has been made only for the embodiment in which the first terminal 11 is a positive electrode terminal and the second terminal 21 is a negative electrode terminal, the present application is not limited to the above-described embodiment, and for example, the first terminal 11 may be used as the negative electrode terminal and the second terminal 21 may be used as the positive electrode terminal.
Also, it will be understood by those skilled in the art that various corresponding modifications can be made to the structure and arrangement of the components in the secondary battery according to the arrangement positions of the contact pieces 12 and the conductive members 22.
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 comprising: an electrode assembly, a first terminal, a second terminal, and a top cover sheet,
the electrode assembly includes a first pole piece electrically connected to the first terminal, a second pole piece electrically connected to the second terminal, and a separator disposed between the first pole piece and the second pole piece,
the secondary battery further includes: a resistance member, a contact piece attached to the first terminal, and a conductive piece electrically connected to the second terminal,
the top cover sheet is electrically connected with the first terminal all the time through the resistance component and is arranged in an insulating way with the second terminal and the conducting strip;
when the internal pressure of the secondary battery exceeds a reference pressure, the contact piece acts under the action of air pressure and is in contact with the conductive piece to form an electric connection path through the first pole piece, the first terminal, the contact piece, the conductive piece, the second terminal and the second pole piece;
when the secondary battery is passed through by the external conductor, the secondary battery forms an electrical connection path through the second pole piece, the conductor, the top lid sheet, the resistance member, the first terminal, the first pole piece, and the second pole piece.
2. The secondary battery according to claim 1, further comprising a case, wherein the top cover sheet and the case cover each other to form a first chamber for enclosing the electrode assembly and a second chamber for providing an actuating space for the contact sheet,
the first chamber is separated from the second chamber by the contact sheet, and the conductive sheet is located on one side of the top cover sheet away from the electrode assembly.
3. The secondary battery according to claim 2, wherein the top cover is provided with a through hole, and the conductive sheet has a contact portion capable of contacting the contact piece after operation, the contact portion being located in the second chamber.
4. The secondary battery according to claim 3, wherein the top lid sheet includes a body portion and a raised portion that projects toward a side away from the case, the second chamber is surrounded by the contact piece and the raised portion, and the through hole is provided on the raised portion.
5. The secondary battery according to claim 3, wherein the first terminal includes a terminal body and an extension connected,
an opening is formed in the extending portion, the opening faces the through hole, and the contact piece seals the opening to separate the first cavity from the second cavity.
6. The secondary battery according to claim 5, wherein the terminal body and the extension part are of an integral structure or a split structure.
7. The secondary battery of claim 5, further comprising a sealing member sealed between the first chamber and the second chamber, the sealing member being sealingly connected between the extension and the top cover piece and having a first sealing surface in sealing contact with the top cover piece and a second sealing surface in sealing contact with the extension.
8. The secondary battery of claim 2, further comprising a sealing member sealed between the first chamber and the second chamber, the sealing member sealed between the contact sheet and the top cover sheet and having a first sealing surface in sealing contact with the top cover sheet and a second sealing surface in sealing contact with the contact sheet.
9. The secondary battery according to claim 7 or 8, wherein the first sealing surface and the second sealing surface are disposed opposite to each other in an extending direction of the top lid sheet, and/or
The first sealing surface and the second sealing surface are disposed opposite to each other in a height direction of the secondary battery.
10. The secondary battery according to claim 5, wherein the contact piece includes an inverted portion and a boss,
the turning part is of a sheet-shaped ring surface structure,
the raised head is connected with the turnover part and protrudes towards one side of the top cover plate,
the outer edge of the turnover part is connected with the extending part in a sealing mode, and the contact piece can be contacted with the contact part through the raised head when acting.
11. The secondary battery according to claim 1, further comprising a first terminal plate to which the first terminal is electrically connected, the resistance member being connected in series between the first terminal plate and the top cap sheet.
12. The secondary battery according to claim 11, wherein the resistance member has a first end and a second end,
the top cover sheet is provided with a first concave part, the first end is embedded in the first concave part,
and/or
The first terminal board is provided with a second concave part, and the second end is embedded in the second concave part.
13. The secondary battery according to claim 1, wherein the resistance value of the resistance member is in a range of 2 to 200000 ohms.
14. The secondary battery according to any one of claims 1 to 8 and 10 to 13, further comprising a fuse member connected in series in an electrical connection path through the first pole piece, the first terminal, the contact piece, the conductive sheet, the second terminal, and the second pole piece, wherein an overcurrent area at the fuse member is smaller than an overcurrent area at the rest of the electrical connection path; and is
The fusing component is connected in series between the first pole piece and the first terminal, and/or
The fusing member is connected in series between the second pole piece and the second terminal.
15. The secondary battery according to claim 14, further comprising a first connection member and a second connection member,
the first pole piece is electrically connected with the first terminal through the first connecting piece, the second pole piece is electrically connected with the second terminal through the second connecting piece,
the fusing member is formed on the first connecting member and/or the second connecting member.
16. The secondary battery according to claim 15, wherein the fusing member is formed by forming notches and/or holes in the first connecting member and/or the second connecting member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/105865 WO2018090179A1 (en) | 2016-11-15 | 2016-11-15 | Secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109792031A CN109792031A (en) | 2019-05-21 |
| CN109792031B true CN109792031B (en) | 2022-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680088924.9A Active CN109792031B (en) | 2016-11-15 | 2016-11-15 | Secondary battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109792031B (en) |
| WO (1) | WO2018090179A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904033A (en) * | 2021-09-16 | 2022-01-07 | 宁德新能源科技有限公司 | Battery cell and electric equipment |
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| CN102487135A (en) * | 2010-12-02 | 2012-06-06 | Sb锂摩托有限公司 | Rechargeable battery |
| CN102738522A (en) * | 2011-03-30 | 2012-10-17 | Sb锂摩托有限公司 | Secondary battery |
| CN204668368U (en) * | 2015-06-11 | 2015-09-23 | 宁德时代新能源科技有限公司 | Top cover structure of power battery and electrokinetic cell |
| CN205542938U (en) * | 2016-04-26 | 2016-08-31 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap and secondary cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9634299B2 (en) * | 2011-09-06 | 2017-04-25 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| JP2014099347A (en) * | 2012-11-15 | 2014-05-29 | Toyota Industries Corp | Power storage device |
| US20140227567A1 (en) * | 2013-02-14 | 2014-08-14 | Samsung Sdi Co., Ltd. | Battery module |
| CN204614848U (en) * | 2015-05-11 | 2015-09-02 | 宁德时代新能源科技有限公司 | Lithium ion battery external short circuit jockey |
| CN205657097U (en) * | 2016-05-20 | 2016-10-19 | 宁德时代新能源科技股份有限公司 | Secondary cell safety top cap |
| CN105932181B (en) * | 2016-07-15 | 2018-09-28 | 东莞永蓝电子科技有限公司 | A kind of power battery head cover and the power battery using the head cover |
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2016
- 2016-11-15 WO PCT/CN2016/105865 patent/WO2018090179A1/en active Application Filing
- 2016-11-15 CN CN201680088924.9A patent/CN109792031B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487135A (en) * | 2010-12-02 | 2012-06-06 | Sb锂摩托有限公司 | Rechargeable battery |
| CN102738522A (en) * | 2011-03-30 | 2012-10-17 | Sb锂摩托有限公司 | Secondary battery |
| CN204668368U (en) * | 2015-06-11 | 2015-09-23 | 宁德时代新能源科技有限公司 | Top cover structure of power battery and electrokinetic cell |
| CN205542938U (en) * | 2016-04-26 | 2016-08-31 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap and secondary cell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109792031A (en) | 2019-05-21 |
| WO2018090179A1 (en) | 2018-05-24 |
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