WO2011022972A1

WO2011022972A1 - Combination cover of battery and battery

Info

Publication number: WO2011022972A1
Application number: PCT/CN2010/071653
Authority: WO
Inventors: 毛焕宇; 郝焱; 尚随军; 郑荣鹏
Original assignee: 比克国际(天津)有限公司; 深圳市比克电池有限公司
Priority date: 2009-08-26
Filing date: 2010-04-09
Publication date: 2011-03-03
Also published as: CN101997095B; CN101997095A

Abstract

A combination cover (10, 20) of battery and a battery are provided, wherein the combination cover includes a coping (1), an anti-explosive film (2), a pulling plate (4) and an insulating component (3). The coping (1) is provided with vents (6), the lower surface of the coping (1) is fixed and hermetically and electrically connected with the anti-explosive film (2), a vent chamber (5) is formed between the coping (1) and the anti-explosive film (2), the vent chamber (5) is interconnected with the vents (6); the pulling plate is provided below the anti-explosive film (2), the anti-explosive film (2) is fixed and electrically connected with the pulling plate (4); and the insulating component (3) is provided in the non-electrically connecting area between the anti-explosive film (2) and the pulling plate (4). The coping (1) and the anti-explosive film (2) are directly laminated and contacted, the insulating component (3) is provided between the anti-explosive film (2) and the pulling plate (4), and an mounting stand in the art is omitted, so the whole structure of the combination cover (10, 20) of battery becomes compact, the height of the combination cover (10) of battery is greatly reduced and the can (11) is capable of holding the higher electrode core (12) which is the electrode core (12) with larger capacity, thereby the capacity of battery is improved.

Description

Battery cover and battery

Technical field

The invention relates to a battery cover and a battery.

Background technique

At present, the battery is generally provided with a cover plate assembly with an explosion-proof function. An explosion-proof cover plate assembly is disclosed in Chinese Patent Publication No. CN101170168A, the disclosure of which is incorporated herein by reference. a cavity communicating with the upper and lower sides, the cavity is insulated and sealed by the insulating member to seal the cover plate and the anti-riot film, and the cover plate and the explosion-proof film are electrically connected and form a pressure relief chamber with each other, and a pressure relief hole is arranged on the cover plate. The explosion-proof membrane is electrically connected to the pull plate located under the insulating member and fixed to the mounting seat.

technical problem

The technical problem to be solved by the present invention is to provide a battery cover and a battery capable of improving battery capacity.

Technical solution

The technical solution adopted by the present invention to solve the technical problem thereof is: a battery assembly cover comprising a top cover, an explosion-proof film, a pull plate and an insulating member; the top cover is provided with a pressure relief hole, and the lower surface of the top cover is The explosion-proof membrane is fixed and sealed to be electrically connected, a pressure relief chamber is formed between the top cover and the explosion-proof membrane, and the pressure relief chamber is penetrated with the pressure relief hole; Pulling the plate, the explosion-proof film is fixedly and electrically connected to the pull plate; the insulating member is disposed in a non-electrical connection region between the explosion-proof film and the pull plate.

Further, the top cover has a first middle portion and a first circumference surrounding the first middle portion, the explosion-proof membrane has a second middle portion and a second circumference surrounding the second middle portion, and the pressure relief chamber is formed Between the first middle portion and the second middle portion, a lower surface of the top cover includes a lower surface of the first circumference, and a lower surface of the first circumference and an upper surface of the second circumference are fixed and sealed to be electrically connection.

Further, the lower surface of the first peripheral edge is laminated and in surface contact with the upper surface of the second peripheral edge.

Further, the pull plate has a third middle portion and a third circumference surrounding the third middle portion, the third middle portion and the second middle portion are fixedly and electrically connected, and a gap is formed between the third circumference and the explosion-proof film. The gap is the non-electrical connection region.

Further, the second peripheral edge and the third peripheral edge are respectively laminated and in surface contact with the upper surface and the lower surface of the insulating member.

Further, the third circumference has a through hole.

Further, the pull plate is embedded in the insulating member.

Further, a lower surface of the top cover is further provided with a boss for positioning the explosion-proof membrane, and the boss is located at a periphery of a periphery of the explosion-proof membrane. Further, the boss is annular.

Further, the top cover and the explosion-proof film are fixed by laser welding, and the top cover and the pull plate are fixed by riveting.

Further, the laser weld penetrates the explosion-proof membrane and extends to the inside of the top cover.

Further, the laser welding portion is located between an inner wall of the boss and a periphery of the explosion-proof membrane.

A battery comprising a cylinder, a battery core and the battery assembly cover, the battery core is disposed in the cylinder body, the battery core has a tab, and a top cover of the battery assembly cover is fixed to the cylinder body The explosion-proof membrane of the battery assembly cover is connected to the tab of the battery core.

Beneficial effect

The beneficial effects of the present invention are that The top cover and the explosion-proof film are directly laminated, the insulating member is disposed between the explosion-proof film and the pull plate, and the prior art assembly is omitted, so that the overall structure of the battery assembly cover is compact, compared with the prior art. It is said that the height of the battery assembly cover is greatly reduced. Therefore, for the battery cartridge of the same specification in the prior art, since the height of the battery assembly cover of the present invention is small, the cylinder can be loaded with a higher height. The core, which is a larger capacity cell, increases battery capacity.

DRAWINGS

1 is a front elevational view of a battery cover of an embodiment of the present invention;

Figure 2 is a cross-sectional view taken along line M-M of Figure 1;

Figure 3 is an enlarged schematic view of A in Figure 2;

4 is a perspective view of a battery assembly cover according to an embodiment of the present invention;

5 is a schematic view of a battery using a battery cover of an embodiment of the present invention;

6 is a front elevational view of a battery cover of another embodiment of the present invention;

Figure 7 is a cross-sectional view taken along line N-N of Figure 6;

Figure 8 is an enlarged schematic view of C in Figure 7;

9 is a perspective view of a battery cover of another embodiment of the present invention;

Figure 10 is a schematic view of a battery using a battery cover of another embodiment of the present invention.

Embodiments of the invention

Embodiment 1

As shown in FIGS. 1 to 4, a battery assembly cover 10 includes a top cover 1, an explosion-proof film 2, a pull plate 4, and an insulating member 3. A pressure-relieving chamber 5 is formed between the lower surface of the top cover 1 and the explosion-proof membrane 2 and a pressure relief chamber 5 is formed between the top cover 1 and the explosion-proof membrane 2; as shown in FIG. The middle portion of the film 2 is fixedly and electrically connected to the middle portion of the pull plate 4; as shown in FIG. 2, the insulation is provided in a non-electrical connection region between the lower surface of the peripheral surface of the explosion-proof film 2 and the upper surface of the peripheral edge of the pull plate 4. Item 3. Wherein, the sealed electrical connection between the top cover 1 and the explosion-proof membrane 2 may be laser welding, high-temperature flame welding or conductive adhesive bonding, etc., on the one hand, the electrical conduction function is realized, on the other hand, the sealing property is reliable, and the existing In the technology, since the structurally complicated insulating member needs to be installed in the complicated assembly seat, and the top cover and the explosion-proof membrane are sealed and assembled by the complicated insulating member, the entire assembly process is complicated and the sealing is difficult; The method adopts laser welding, which penetrates the explosion-proof membrane 2 and extends to the inside of the top cover 1 (as indicated by the arrow B in FIG. 3), the specific realization process is: firstly, an annular concave is formed on the explosion-proof membrane 2 The groove, the laser beam penetrates into the groove, and the groove wall of the groove is melted. At the same time, under the action of heat conduction, the portion of the top cover 1 facing the groove of the explosion-proof film 2 is also melted, thereby the explosion-proof film 2 and the top cover 1 The fusion is connected, the sealing is good, and the processing is easy.

In addition, the fixed electrical connection between the explosion-proof membrane 2 and the pull plate 4 may be riveting, welding or conductive adhesive bonding, etc. These simple connection manners make the structure of the explosion-proof membrane 2 and the pull-plate 4 compact, on the one hand The function of electrical conduction, on the other hand, can realize the function of setting the power-off strength; in the present embodiment, the fixed electrical connection between the explosion-proof membrane 2 and the pull plate 4 is riveting, and the riveting method is specifically: the explosion-proof membrane 2 The middle portion has a downwardly projecting projection 21, and a middle portion of the pull plate 4 has a through hole 41. The projection 21 is riveted in the through hole 41, and a riveting portion exists at a portion where the projection 21 contacts the through hole 41. The strength (as indicated by the arrow E in Fig. 2), the riveting strength is the above-mentioned breaking strength. The explosion-proof membrane 2 itself also has a burst strength which is greater than the riveting strength. Further, the top cover 1 is provided with a pressure relief hole 7, and the pressure relief hole 7 and the pressure relief chamber 5 are penetrated. The pull plate 4 is provided with a venting hole 6 to enable gas in the battery to apply gas pressure to the explosion-proof membrane 2 through the vent hole 6. In fact, the gas in the battery can also pass between the insulating member 3 and the pull plate 4. A gap between the slit, the insulating member 3 and the explosion-proof membrane 2 applies a gas pressure to the explosion-proof membrane 2.

In this embodiment, a pressure relief chamber is formed between the middle portion of the top cover and the middle portion of the explosion-proof membrane, and the periphery of the top cover is fixed to the periphery of the explosion-proof membrane and sealed and electrically connected. The middle portion of the top cover and the middle portion of the explosion-proof membrane may be respectively defined as The first central portion 100 and the second central portion 200, the periphery of the top cover and the periphery of the explosion-proof membrane may be defined as a first peripheral edge 101 and a second peripheral edge 201, respectively, the first peripheral edge 101 may surround the first central portion 100, the second The peripheral edge 201 can surround the second central portion 200, and the lower surface of the first peripheral edge and the upper surface of the second peripheral edge are electrically connected in a sealed manner. The lower surface of the first circumference and the upper surface of the second circumference may be in surface contact. The middle portion of the pull plate is fixedly and electrically connected to the middle portion of the explosion-proof film, and the pull plate and the explosion-proof film also have a non-electrical connection region, for example, a gap may be formed between the periphery of the pull plate and the explosion-proof film, and the gap is the non- The electrical connection region, in which the insulating member is disposed, the middle portion of the pull plate may be defined as a third middle portion 400, and the peripheral edge of the pull plate may be defined as a third peripheral edge 401. The upper surface of the insulating member may be in direct lamination contact with the lower surface of the second peripheral edge, and the lower surface of the insulating member may be in direct lamination contact with the third peripheral edge, and the venting hole may penetrate the third peripheral edge 401.

As shown in FIG. 5, a battery using the above battery assembly cover 10 includes a cylinder 11, a battery core 12 with tabs 13, and a battery assembly cover 10. The top cover of the battery assembly cover 10 is fixedly connected to the cylinder body, and the explosion-proof membrane is connected to the tab 13 of the battery core 12.

The battery assembly cover 10 of the present embodiment is applied to a battery, and the working process is: the battery is energized, the electrolyte in the battery generates gas, the gas passes through the vent hole 6 of the pull plate 4, and the gap between the insulating member 3 and the pull plate 4 a gap between the insulating member 3 and the explosion-proof membrane 2, applying a gas pressure to the explosion-proof membrane 2, when the pressure exceeds the riveting strength between the explosion-proof membrane 2 and the pull-plate 4, that is, the power-off strength, the riveting is broken, that is, the explosion-proof membrane 2 The electrical connection to the pull plate 4 is broken. At this time, the speed at which the battery generates gas due to the power failure is greatly slowed down, and the increase in the pressure in the battery is alleviated. When the gas pressure continues to rise beyond the bursting strength of the explosion-proof membrane 2, the explosion-proof membrane 2 is broken, so that the gas is released to the outside through the pressure relief chamber 5 and the pressure relief hole 7, and the battery is explosion-proof.

In the battery assembly cover 10 of the present embodiment, since the top cover and the explosion-proof film are in direct lamination surface contact, and the explosion-proof film 2 and the pull plate 4 are electrically connected to each other, the direct lamination surface contact is also performed, but only the lower surface of the explosion-proof film 2 and the lower plate are pulled. A layer of insulating member 3 is disposed between the upper peripheral surfaces of the periphery 4 to make the overall structure of the battery assembly cover 10 compact, and at the same time, the existing assembly base is omitted, which is greatly reduced compared with the prior art. The height of the battery assembly cover, therefore, for the battery cartridge of the same specification in the prior art, since the height of the battery assembly cover 10 of the present embodiment is small, the volume of the battery core 12 incorporated in the cylinder 11 is large because of electricity. The height of the core 12 is high, that is, the capacity of the battery core 12 is large. Thus, the capacity of the battery of the present embodiment is improved.

Embodiment 2

As shown in FIGS. 6 to 9, a battery cover 20 of the present embodiment is further improved based on the battery cover 10 of the first embodiment. The improvement is as follows: First, the lower surface of the top cover 1 is provided with a boss 8 for positioning the explosion-proof membrane 2; the boss 8 is located at the periphery of the periphery of the explosion-proof membrane, can quickly locate the explosion-proof membrane, and improves the top cover 1 and the explosion-proof membrane The welding speed between 2. In addition, the boss 8 may be annular, and the gap between the inner wall of the boss 8 and the periphery of the explosion-proof membrane 2 may serve as a laser welding portion (as indicated by an arrow D in FIG. 8), and the laser beam penetrates the gap during welding. In other embodiments, it is also possible to use a high-temperature flame to penetrate the gap, so that the two parts of the top cover 1 and the explosion-proof membrane 2 are simultaneously heated to form a deeper molten pool, so that the weld seam formed by welding can be greatly sealed and strong. improve. Secondly, the peripheral edge of the pull plate 4 is embedded in the insulating member 3. After the battery riveting is broken, the pull plate 4 may be directly contacted with the inner wall of the cylindrical body 11 when the battery is shaken inside the battery, so as to avoid the short circuit between the pull plate 4 and the cylindrical body 11. . Third, the explosion-proof membrane 2 can be provided with a ring-shaped nick (not shown), and the rupture strength of the rupture film 2 can be accurately set by the nick.

As shown in FIG. 10, a battery using the battery assembly cover 20 includes a cylinder 11, a battery core 12, and a battery assembly cover 20, and the battery assembly cover 20 is placed on the cylinder 11. The top cover of the battery assembly cover 20 is connected to the cylinder 11 and the explosion-proof membrane is connected to the tab 13 of the battery core 12.

For the battery combination, the sealed electrical connection between the top cover and the explosion-proof membrane can be bonded by welding or conductive adhesive, on the one hand, the electrical conduction function is realized, on the other hand, the sealing property is reliable, and the laser welding portion can penetrate the explosion-proof The film extends to the inside of the top cover to form a fusion joint between the top cover and the riot film, and has good sealing property and easy processing. The lower surface of the top cover can be quickly positioned by the boss to improve the assembly efficiency. Especially when the anti-riot film is positioned in the annular boss, laser welding is used between the inner wall of the boss and the periphery of the explosion-proof membrane, because the laser beam can penetrate into the gap between the inner wall of the boss and the periphery of the explosion-proof membrane, so that the inner wall It is welded to the periphery and has good sealing and is easier to process. The pull plate is provided with a venting hole, so that the gas in the battery can pass through the vent hole to apply gas pressure to the explosion proof.

The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. For those skilled in the art to which the present invention pertains, it is also possible to do without departing from the inventive concept. A number of simple deductions or substitutions are considered to be within the scope of the invention.

Claims

A battery assembly cover, comprising: a top cover, an explosion-proof film, a pull plate and an insulating member; the top cover is provided with a pressure relief hole, and a lower surface of the top cover is fixed with the explosion-proof film and sealed for electrical properties Connecting, a pressure relief chamber is formed between the top cover and the explosion-proof membrane, the pressure relief chamber is penetrated with the pressure relief hole; the pull plate is disposed under the explosion-proof membrane, and the explosion-proof membrane and the The pull plate is fixed and electrically connected; the insulating member is disposed in a non-electrical connection region between the explosion-proof film and the pull plate.
The battery assembly cover according to claim 1, wherein said top cover has a first middle portion and a first circumference surrounding said first middle portion, said explosion-proof film having a second middle portion and surrounding said second portion a second circumference of the middle portion, the pressure relief chamber is formed between the first middle portion and the second middle portion, the lower surface of the top cover includes a lower surface of the first circumference, and a lower surface of the first circumference The upper surface of the second circumference is fixed and sealed electrically.
The battery unit cover according to claim 2, wherein a lower surface of the first peripheral edge is laminated in surface contact with an upper surface of the second peripheral edge.
The battery assembly cover according to claim 3, wherein the pull plate has a third middle portion and a third circumference surrounding the third middle portion, and the third middle portion and the second middle portion are fixedly and electrically connected. There is a gap between the third circumference and the explosion-proof membrane, and the gap is the non-electrical connection region.
The battery pack cover according to claim 4, wherein said second peripheral edge and said third peripheral edge are laminated and in surface contact with said upper surface and said lower surface of said insulating member, respectively.
The battery pack cover according to claim 5, wherein said third peripheral edge has a venting hole therethrough.
The battery pack cover according to any one of claims 1 to 6, wherein the pull plate is embedded in the insulating member.
The battery assembly cover according to any one of claims 1 to 7, wherein a lower surface of the top cover is further provided with a boss for positioning the explosion-proof film, and the boss is located at the explosion-proof film. The periphery of the circumference.
The battery pack cover according to claim 8, wherein said boss is annular.
The battery pack cover according to any one of claims 1 to 9, wherein the top cover and the explosion-proof film are fixed by laser welding, and the top cover and the pull plate are fixed by riveting.
A battery comprising a cylinder and a battery core, the battery core being disposed in the cylinder, the battery core having a tab, characterized by further comprising the battery assembly according to any one of claims 1-10 a cover, the top cover of the battery assembly cover is fixed to the cylinder, and an explosion-proof film of the battery assembly cover is connected to the tab of the battery core.