CN217641705U

CN217641705U - Lower plastic subassembly, battery top cap and secondary cell

Info

Publication number: CN217641705U
Application number: CN202221410685.3U
Authority: CN
Inventors: 何金磊; 张方超; 赵艺惠
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-10-21
Anticipated expiration: 2032-05-31

Abstract

The utility model discloses lower plastic subassembly, battery top cap and secondary battery, relate to new forms of energy technical field, second surface through plastic under sets up bellied wall, set up the through-hole that wears to establish with the confession wall on the fuse valve, therefore, the posterous post is connected with electric core through the fuse valve, when the extreme condition such as outside short circuit appears, the fuse valve can use the through-hole place position to fuse fast, and separate for two parts by the wall part, still there is the lotus root broken string even between the two parts after avoiding taking place the fuse at the fuse valve, guarantee to break off completely, avoid the electric current to pass through, reduce the potential safety hazard.

Description

Lower plastic subassembly, battery top cap and secondary cell

Technical Field

The utility model belongs to the technical field of the new forms of energy technique and specifically relates to a lower plastic subassembly, battery top cap and secondary battery are related to.

Background

Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and meanwhile, along with the development of modern society and the enhancement of environmental protection consciousness of people, more and more devices select the lithium battery as a power supply, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, so that a wide space is provided for the application and development of the lithium battery.

In the use of lithium cell, then lead to the lithium cell to damage easily too big then of electric current in the lithium cell, the life-span that then causes the lithium cell very easily that lasting overcurrent charges reduces, and is more serious, can lead to dangerous accidents such as the lithium cell explosion, and at present, anodal utmost point post is connected with electric core electricity through flaky fusing valve to when accidents such as taking place outside short circuit, fusing takes place to fuse with the outage.

However, in the prior art, the fuse valves are also wired after being fused, and cannot be completely disconnected, so that current passes through the fuse valves, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lower plastic subassembly, battery top cap and secondary battery realize that the fusing valve takes place to break off completely after fusing, reduce the potential safety hazard.

In a first aspect, the utility model provides a lower plastic subassembly, include:

the lower plastic is provided with a positive pole column hole, a first surface and a second surface, the first surface and the second surface are opposite, the first surface is used for facing the top cover, the second surface is used for facing the battery cell, the positive pole column hole penetrates through the first surface and the second surface, and the second surface is provided with a raised partition part;

and the fusing valve is fixed on the second surface and covers the anode column hole, and the fusing valve is provided with a through hole for the partition part to penetrate through.

In an alternative embodiment, a surface of the partition remote from the second surface is provided with a groove to shape the partition into a ring.

In an alternative embodiment, a surface of the shut-off is recessed relative to a surface of the fuse valve.

In an alternative embodiment, the through hole is provided in the middle of the fuse valve.

In an optional embodiment, the second surface is provided with two fixing members, and the two fixing members are respectively located at two sides of the partition portion in the length direction of the lower plastic, so as to fix the fusing valve.

In an alternative embodiment, each of the fixing members includes two opposite clamping bodies in the width direction of the lower plastic, a groove is formed between each of the clamping bodies and the second surface, and the four grooves cooperate with the side edges of the fusing valve together to fix the fusing valve.

In an optional embodiment, each of the clamping bodies includes a first connecting portion and a second connecting portion connected at an included angle, the first connecting portion is connected to the second surface, the second connecting portion is opposite to the second surface, and the second surface, the first connecting portion, and the second connecting portion together form one groove.

In an alternative embodiment, the surface of the second connecting portion remote from the second surface and the surface close to the partition portion are transited by a guide slope.

In a second aspect, the present invention provides a battery top cap, comprising the lower plastic component of any of the previous embodiments.

In a third aspect, the present invention provides a secondary battery comprising the battery top cap according to the foregoing embodiment.

The utility model discloses lower plastic subassembly, battery top cap and secondary battery set up bellied wall portion through the second surface of plastic under, set up the through-hole that supplies wall portion to wear to establish on the fuse valve, therefore, the post passes through the fuse valve and is connected the back with electric core, when the extreme condition such as outside short circuit appears, the fuse valve can use the position of through-hole place to melt fast, and be two parts by separating the wall portion, still there is the lotus root broken string to connect between the two parts after avoiding taking place the fuse at the fuse valve, guarantee the complete disconnection, avoid the electric current to pass through, reduce the potential safety hazard.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the plastic according to the embodiment of the present invention;

FIG. 2 is a schematic view of a lower plastic component according to an embodiment of the present invention;

FIG. 3 is a schematic view of a fuse valve according to an embodiment of the present invention;

fig. 4 is an enlarged view of a portion a of fig. 1.

Icon: 1000-lower plastic component; 10-discharging plastic cement; 11-a first surface; 12-a second surface; 13-positive pole column hole; 14-negative pole column hole; 15-explosion-proof valve ventilation part; 16-liquid injection hole; 17-a partition; 170-groove; 18-a retainer; 181 — a first connection; 182-a second connection portion; 183-guide slope; 19-a trench; 30-a fuse valve; 31-through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The embodiment of the utility model provides a battery top cap, this battery top cap can constitute the battery with electric core, casing jointly, for example secondary battery, this battery top cap includes cover plate, lower plastic subassembly 1000, anodal post, negative pole post, explosion-proof valve screening glass etc..

The cover plate is used for the closing cap at battery case's top to constitute the space that is used for holding electric core jointly with battery case, the cover plate is microscler flat board usually, and it has set gradually anodal mounting hole, explosion-proof valve mounting hole and negative pole mounting hole on self length direction, and anodal post then wears to locate anodal mounting hole, and fixed for the cover plate, and the negative pole mounting hole is worn to locate by the negative pole post, and is fixed for the cover plate.

The lower plastic component 1000 includes a lower plastic 10, referring to fig. 1, the lower plastic 10 is also generally in a shape of a long plate, and a length direction of the lower plastic 10 is parallel to a length direction of the cover plate, the lower plastic 10 has a positive post hole 13, a negative post hole 14, a first surface 11 and a second surface 12, the first surface 11 and the second surface 12 are opposite, the first surface 11 is used for facing the top cover, the second surface 12 is used for facing the battery cell, the positive post hole 13 and the negative post hole 14 are disposed in the length direction of the lower plastic 10 and are respectively located on two sides of the lower plastic 10, the positive post hole 13 and the negative post hole 14 both penetrate through the first surface 11 and the second surface 12 to electrically connect the positive post and the negative post with the positive tab and the negative tab of the battery cell, so that the lower plastic 10 can improve an insulating performance of the cover plate and the battery cell and prevent the electrolyte from corroding the cover plate to cause battery swelling.

The lower plastic 10 is also provided with an explosion-proof ventilation part which is positioned in the middle of the lower plastic 10, the middle part of the first surface 11 is sunken towards the middle part of the second surface 12 to form an accommodating cavity for accommodating an explosion-proof valve, meanwhile, the explosion-proof ventilation part is provided with a plurality of grid holes to be used for ventilation of the explosion-proof valve, therefore, after the cover plate and the lower plastic 10 are assembled, the explosion-proof valve can be placed into the accommodating cavity of the explosion-proof ventilation part through the explosion-proof valve mounting hole, and finally, the explosion-proof valve is covered with the explosion-proof valve mounting hole through the explosion-proof valve, so that when the battery is pressurized upwards due to overcharge, overdischarge, overcurrent and short circuit inside the battery, the battery is automatically and quickly decompressed, and the safety accident caused by battery explosion is avoided.

The cover plate is provided with a liquid injection hole 16, the lower plastic 10 is also provided with a liquid injection via hole which penetrates through the first surface 11 and the second surface 12, the liquid injection via hole corresponds to the liquid injection hole 16 and is positioned on one side of the explosion-proof breathable part, and between the explosion-proof breathable part and the anode column hole 13, and in the liquid injection process of the power battery, electrolyte is injected into the battery shell through the liquid injection hole 16 and the liquid injection via hole.

Referring to fig. 2 to 4, in this embodiment, the lower plastic component 1000 further includes a fuse valve 30, the second surface 12 is provided with a raised partition portion 17, the fuse valve 30 is fixed on the second surface 12 and covers the positive post hole 13, wherein the fuse valve 30 has a through hole 31 for the partition portion 17 to penetrate through, so that after the positive post is connected with the battery core through the fuse valve 30, when the external short circuit and other pole conditions occur, the fuse valve 30 can be rapidly fused with the position of the through hole 31 as a boundary, and is separated into two parts by the partition portion 17, so as to avoid that a coupler fuse is still present between the two parts after the fuse valve 30 is fused, thereby ensuring complete disconnection, avoiding current from passing through, and reducing potential safety hazards. The partition 17 is located between the vent 15 of the explosion-proof valve and the positive pole hole 13 and close to the positive pole hole 13, so as to reduce the length of the fuse valve 30.

The surface of the partition part 17 far away from the second surface 12 is provided with a groove 170 so as to shape the partition part 17 into a ring shape, thereby reducing the heating area of the partition part 17 and relieving the softening phenomenon of the lower plastic 10 when the fusing valve 30 is welded with the positive pole and the positive pole lug of the battery cell. In addition, the thickness of the blocking portion 17 is smaller than that of the fuse valve 30, so that the surface of the blocking portion 17 is recessed with respect to the surface of the fuse valve 30, and the heat transferred to the lower plastic 10 can be reduced.

Specifically, the blocking portion 17 has a square ring shape to better separate two portions formed after the fusing of the fusing valve 30.

In this embodiment, the through hole 31 is provided in the middle of the fusible valve 30, so that the fusible valve 30 is divided into two parts with slightly different volumes by the through hole 31 after fusing.

In this embodiment, second surface 12 is equipped with two mountings, two the mounting is located respectively wall portion 17 is in down 10 length direction's of plastic both sides, in order to incite somebody to action fuse valve 30 is fixed, takes place the fusing back at fuse valve 30 in addition, and two mountings can be detained respectively and fuse two sheetmetals that form after valve 30 breaks off for the sheetmetal of two parts still is the fixed state, avoid falling after with the inside other metal parts overlap joint of electric core, the secondary short circuit injury that the overlap joint caused appears once more after avoiding fusing, play the guard action.

Furthermore, each fixing member includes two opposite clamping bodies 18 in the width direction of the lower plastic 10, a groove 19 is formed between each clamping body 18 and the second surface 12, and the four grooves 19 are matched with the side edges of the fusing valve 30 together to fix the fusing valve 30, so as to facilitate the assembly of the fusing valve 30 and the lower plastic 10.

Specifically, each of the clamping bodies 18 includes a first connecting portion 181 and a second connecting portion 182 connected at an included angle, the first connecting portion 181 is connected to the second surface 12, the second connecting portion 182 is opposite to the second surface 12, and the second surface 12, the first connecting portion 181, and the second connecting portion 182 together form the groove 19.

In this embodiment, the surface of the second connecting portion 182 away from the second surface 12 and the surface close to the blocking portion 17 are transited through the guiding inclined surface 183, so that when the fuse valve 30 and the lower plastic 10 are assembled, the through hole 31 of the fuse valve 30 is aligned with the blocking portion 17 and then directly pressed towards the second surface 12, and in the process, the side edge of the fuse valve 30 slidably presses the guiding inclined surface 183 to further clamp into the groove 19, thereby facilitating the installation of the fuse valve 30.

Of course, in some embodiments, the fixing element may also be a clip or the like that is engaged with the second surface 12, as long as two fixing elements can fix the two parts of the fusing valve 30 after fusing to the second surface 12. In other embodiments, the fuse valve 30 may be directly connected to the second surface 12 through a plurality of connection columns, for example, the connection columns are disposed on the second surface 12 and distributed on two sides of the partition 17 in the length direction of the lower plastic 10, correspondingly, the fuse valve 30 is provided with a plurality of connection holes, and the connection columns and the connection holes are in one-to-one interference fit, so that the fuse valve 30 is fixed relative to the lower plastic 10 even if the fuse valve 30 is broken into two parts and does not fall off.

To sum up, the embodiment of the utility model provides a second surface 12 through plastic 10 sets up bellied wall 17 under, set up the through-hole 31 that supplies wall 17 to wear to establish on fusing valve 30, from this, the anodal post passes through fusing valve 30 and is connected the back with electric core, when the extreme condition such as outside short circuit appears, fusing valve 30 can use through-hole 31 position to fuse fast as the border, and separate for two parts by wall 17, still there is the lotus root broken string even between the two parts after avoiding taking place fusing at fusing valve 30, guarantee to break off completely, avoid the electric current to pass through, reduce the potential safety hazard.

The embodiment of the utility model provides a secondary battery is still provided, and this secondary battery includes the battery top cap of above-mentioned embodiment, consequently also has corresponding structure and beneficial effect, specifically refers to the battery top cap of above-mentioned embodiment, and no longer repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A lower plastic component, comprising:

the lower plastic (10) is provided with a positive pole hole (13), a first surface (11) and a second surface (12), the first surface (11) and the second surface (12) are opposite, the first surface (11) is used for facing a top cover, the second surface (12) is used for facing a battery cell, the positive pole hole (13) penetrates through the first surface (11) and the second surface (12), and the second surface (12) is provided with a raised partition part (17);

and the fusing valve (30) is fixed on the second surface (12) and covers the anode column hole (13), wherein the fusing valve (30) is provided with a through hole (31) for the partition part (17) to penetrate through.

2. Lower plastic part according to claim 1, characterized in that the surface of the partition (17) remote from the second surface (12) is provided with a groove (170) for molding the partition (17) in a ring shape.

3. Lower plastic component according to claim 1, characterized in that the surface of the partition (17) is recessed with respect to the surface of the fuse valve (30).

4. Lower plastic part according to claim 1, characterized in that the through-hole (31) is provided in the middle of the fuse valve (30).

5. The lower plastic component according to claim 4, wherein the second surface (12) is provided with two fixing members, and the two fixing members are respectively located at two sides of the partition (17) in the length direction of the lower plastic (10) to fix the fusing valve (30).

6. The lower plastic assembly of claim 5, wherein each of the fixing members includes two retaining bodies (18) opposite to each other in a width direction of the lower plastic (10), a groove (19) is formed between each of the retaining bodies (18) and the second surface (12), and four grooves (19) are jointly engaged with the side edges of the fusible valve (30) to fix the fusible valve (30).

7. Lower plastic component according to claim 6, characterized in that each of the clamping bodies (18) comprises a first connecting portion (181) and a second connecting portion (182) connected at an included angle, the first connecting portion (181) is connected with the second surface (12), the second connecting portion (182) is opposite to the second surface (12), and the second surface (12), the first connecting portion (181) and the second connecting portion (182) together form the groove (19).

8. Lower plastic component according to claim 7, characterized in that the surface of the second connection (182) remote from the second surface (12) and the surface close to the partition (17) are transitioned by a guide ramp (183).

9. A battery top cap comprising the lower plastic component of any one of claims 1-8.

10. A secondary battery comprising the battery top cap of claim 9.