CN219106326U - Cover plate assembly of secondary battery and secondary battery - Google Patents
Cover plate assembly of secondary battery and secondary battery Download PDFInfo
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- CN219106326U CN219106326U CN202222533864.2U CN202222533864U CN219106326U CN 219106326 U CN219106326 U CN 219106326U CN 202222533864 U CN202222533864 U CN 202222533864U CN 219106326 U CN219106326 U CN 219106326U
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- sealing
- cover plate
- hole section
- inner fixing
- liquid injection
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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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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a cover plate assembly of a secondary battery and the secondary battery, wherein the cover plate assembly comprises a cover plate and a sealing nail, a liquid injection hole is arranged on the cover plate, the liquid injection hole is communicated and arranged along the thickness direction of the cover plate, the liquid injection hole comprises a first hole section and a second hole section, the aperture of the first hole section is larger than that of the second hole section, a step surface is formed between the first hole section and the second hole section, and the cover plate comprises a first surface facing towards the electrode assembly and a second surface facing away from the electrode assembly; the first hole section and the second hole section are communicated and arranged along the direction from the first surface to the second surface of the cover plate; the sealing nail of the cover plate assembly comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected, wherein the outer sealing part, the connecting part and the inner sealing part are respectively in sealing connection with the step surface of the liquid injection hole, the inner surface and the second surface of the cover plate, namely, a triple sealing mode is adopted, so that the sealing effect is ensured, and the improvement of the safety of the battery is facilitated.
Description
Technical Field
The utility model relates to the technical field of secondary batteries, in particular to a cover plate assembly of a secondary battery and the secondary battery.
Background
With the development of electrochemical technology, secondary batteries are increasingly widely used, and the requirements of safety of the secondary batteries are increasingly high, particularly in the packaging structure and the packaging process of the secondary batteries.
In order to facilitate injection of electrolyte into the lithium ion battery, a lid plate of the secondary battery is generally provided with a liquid injection hole. In order to ensure the tightness of the secondary battery, after the liquid injection is finished, sealing nails are often adopted to seal the liquid injection hole. However, the current sealant nails are of a conical structure with small heads and large tails, the requirements on the force for beating the sealant nails are high, the force is too large, the sealant nails easily enter the battery cell, and the sealing performance is poor; the strength is too small to block the sealing aluminum nails, so that the aluminum nails are raised to cause poor welding.
Disclosure of Invention
In view of the above, the present utility model proposes a cap assembly of a secondary battery and a secondary battery to overcome or at least partially solve the above problems.
An object of the present utility model is to provide a cap assembly of a secondary battery, comprising:
the sealing device comprises a cover plate and sealing nails, wherein liquid injection holes are formed in the cover plate and penetrate through the cover plate in the thickness direction; the liquid injection hole comprises a first hole section and a second hole section, the aperture of the first hole section is larger than that of the second hole section, a step surface is formed between the first hole section and the second hole section, and the cover plate comprises a first surface facing to the electrode assembly and a second surface facing away from the electrode assembly; the first hole section and the second hole section are communicated and arranged along the direction from the first surface to the second surface of the cover plate; the sealing nail is connected with the liquid injection hole in a sealing fit manner, and comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected; the sealing surface of the outer sealing part is abutted against the step surface, the sealing surface of the connecting part is abutted against the inner surface of the second hole section of the liquid injection hole, and the sealing surface of the inner sealing part is abutted against the second surface of the liquid injection hole of the cover plate.
Further, the sealing spike comprises an outer seal made of a flexible or deformable material and an inner fixture made of a rigid or hard material; the outer sealing piece comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected; the outer sealing element is also provided with an accommodating groove, and the inner fixing element and the accommodating groove of the outer sealing element are relatively fixed.
Further, a clamping structure is oppositely arranged between the inner fixing piece and the outer sealing piece so as to clamp and fix the inner fixing piece and the outer sealing piece; and a blocking part is arranged on the inner fixing piece in the direction close to the first surface of the cover plate, and is used for enabling the sealing nail to be kept on the step surface between the first hole section and the second hole section.
Further, a chamfer structure is arranged at the front end part of the inner sealing part along the direction from the first surface to the second surface of the cover plate.
Further, the chamfer structure is conical. The conical arrangement ensures that the sealing nail can enter the liquid injection hole more easily.
Further, along the first surface to the second surface direction of apron, interior mounting has set gradually the blocking part, and interior mounting connecting portion and interior mounting barb portion, the holding tank of outer sealing member with the outline matching setting of interior mounting is in order to hold and fix interior mounting.
Further, the sealing nails are soft rubber nails made of rubber materials.
Further, the inner fixing piece is made of hard plastic, hard metal or hard composite material.
Further, the outer sealing piece is a soft rubber nail made of rubber materials.
The utility model also aims to provide a secondary battery which comprises electrolyte, a shell and the cover plate assembly, wherein the electrolyte is arranged in a containing cavity formed by the cover plate assembly and the shell.
The technical scheme provided by the embodiment of the utility model has at least the following technical effects or advantages:
the existing sealing nail is unreasonable in structural design, has high requirement on the nail force of sealing glue, and is easy to enter the battery cell or causes poor welding caused by aluminum nail protrusions. Compared with the prior art, the sealing nail of the cover plate assembly comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected, wherein the outer sealing part, the connecting part and the inner sealing part are respectively in sealing connection with the step surface of the liquid injection hole, the inner surface of the liquid injection hole and the second surface of the cover plate, namely, a triple sealing mode is adopted, so that the sealing effect is ensured, and the safety of the secondary battery is ensured. The shape of the sealing glue is changed into a cylindrical structure with two large ends and a small middle, the bottom of the sealing nail is conical, the sealing nail can easily enter the liquid injection hole when being used for punching, and the sealing fixing effect is better. The outer sealing piece is made of flexible or variable materials, the inner fixing piece is made of rigid or hard materials, the sealing nail can easily enter the liquid injection hole when the sealing nail is made, and can rebound easily after deformation, so that the situation that the sealing nail enters the battery cell due to overlarge nailing force is avoided, and the nailing efficiency and sealing quality are improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 illustrates a schematic structural view of an exploded condition of a cover plate assembly in one embodiment;
FIG. 2 shows a top view of the cover plate assembly of FIG. 1 exploded;
FIG. 3 illustrates a cross-sectional view of one embodiment of FIG. 2 along line A-A;
fig. 4 shows a schematic perspective view of the sealing spike of fig. 3.
FIG. 5 shows a cross-sectional view of another embodiment of FIG. 2 taken along line A-A;
fig. 6 is a schematic perspective view showing an exploded state of the sealing spike of fig. 5.
Detailed Description
Reference now will be made in detail to embodiments of the application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation, not limitation, of the present application. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Accordingly, it is intended that the present application cover such modifications and variations as come within the scope of the appended claims and their equivalents. As used in this specification, the terms "first," "second," and the like are used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the respective components. As used in this specification, the terms "a," "an," "the," and "said" are intended to mean that there are one or more elements unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements. Wherein like numerals refer to like elements throughout, the present utility model is further explained below in connection with specific embodiments.
Referring to fig. 1-4, the utility model provides a cover plate assembly of a secondary battery, which comprises a cover plate 1, a sealing cover 2 and sealing nails 3, wherein a liquid injection hole 4 is arranged on the cover plate 1, and the liquid injection hole 4 is communicated with the cover plate 1 along the thickness direction; the liquid injection hole 4 comprises a first hole section 41 and a second hole section 42, the aperture of the first hole section is larger than that of the second hole section, a step surface 43 is formed between the first hole section and the second hole section, and the cover plate 1 comprises a first surface 11 facing the electrode assembly and a second surface 12 facing away from the electrode assembly; the first hole section 41 and the second hole section 42 are arranged in a penetrating manner along the direction from the first surface 11 to the second surface 12 of the cover plate; the sealing nail 3 is connected with the liquid injection hole 4 in a sealing fit manner, and the sealing nail 3 comprises a sealing nail outer sealing part 3a, a sealing nail connecting part 3b and a sealing nail inner sealing part 3c which are sequentially connected; the sealing surface of the outer sealing part 3a is abutted against the step surface 43, the sealing surface of the connecting part 3b is abutted against the inner surface of the second hole section of the liquid injection hole, and the sealing surface 3c of the inner sealing part is abutted against the second surface 12 of the liquid injection hole 4 of the cover plate 1. The outer sealing part, the connecting part and the inner sealing part of the sealing nail of the cover plate assembly are respectively in sealing connection with the step surface and the inner surface of the liquid injection hole and the second surface of the liquid injection hole of the cover plate, namely, a triple sealing mode is adopted, so that the sealing effect is ensured, and the safety of the secondary battery is ensured.
Referring to fig. 5 and 6, in another embodiment, the sealing nail 3 includes an outer sealing member 31 and an inner fixing member 32, the outer sealing member 31 is made of a flexible or variable material, and the inner fixing member 32 is made of a rigid or hard material; the outer seal 31 includes an outer seal portion 31a, an outer seal connecting portion 31b, and an inner and outer seal portion 31c connected in this order; the outer seal member is further provided with a receiving groove 31d, and the inner fixing member 32 is fixed to the receiving groove 31d of the outer seal member 31.
Referring to fig. 5 and 6, a fastening structure is disposed between the inner fixing member 32 and the outer sealing member 31, so as to fasten the inner fixing member and the outer sealing member; the inner fixing element 32 is provided with a blocking portion in the direction of the first surface 11 of the cover plate 1, wherein the blocking portion is used for keeping the sealing nail 3 on the step surface 43 between the first hole section 41 and the second hole section 42.
The front end of the seal part 3c in the seal nail is provided with a chamfer structure along the direction from the first surface 11 to the second surface 12 of the cover plate 1.
The chamfer structure be the toper, the shape that the sealant ordered changes to the cylinder structure of big middle little in both ends, and seal nail bottom is the toper, lets it get into the notes liquid hole more easily when beating seal nail, and sealed fixed effect is better.
Along the direction from the first surface 11 to the second surface 12 of the cover plate 1, the inner fixing member 32 is sequentially provided with a blocking portion 32a, an inner fixing member connecting portion 32b and an inner fixing member barb portion 32c, and the accommodating groove 31d of the outer sealing member 31 is matched with the outer contour of the inner fixing member 32 so as to accommodate and fix the inner fixing member 32. The barb portion 32c and the accommodation groove 31d matched with the barb portion 32c in shape are clamped and fixed with each other, and the sealing nail is prevented from falling off from the liquid injection hole 4.
The sealing nails 3 are soft rubber nails made of rubber materials; the inner fixing member 32 is made of hard plastic, hard metal or hard composite material. The outer sealing member 31 is a soft nail made of rubber material. The outer sealing piece is made of flexible or variable materials, the inner fixing piece is made of rigid or hard materials, the sealing nail can easily enter the liquid injection hole when the sealing nail is made, and can rebound easily after deformation, so that the situation that the sealing nail enters the battery cell due to overlarge nailing force is avoided, and the nailing efficiency and sealing quality are improved.
The secondary battery comprises electrolyte, a shell and the cover plate assembly in the previous embodiment, wherein the electrolyte is arranged in a containing cavity formed by the cover plate assembly and the shell.
While the foregoing is directed to the preferred embodiments of the present utility model, other and further modifications and improvements will readily occur to those skilled in the art based on the teachings herein, and it is intended that all such modifications and improvements be within the scope of this utility model. This written description uses examples to disclose the application, including the best mode, and also to enable any person skilled in the art to practice the application, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the application is defined by the claims, and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. The cover plate assembly of the secondary battery comprises a cover plate and sealing nails, wherein liquid injection holes are formed in the cover plate and penetrate through the cover plate along the thickness direction of the cover plate; the liquid injection hole comprises a first hole section and a second hole section, the aperture of the first hole section is larger than that of the second hole section, a step surface is formed between the first hole section and the second hole section, the liquid injection hole is characterized in that,
the cover plate includes a first surface facing the electrode assembly and a second surface facing away from the electrode assembly;
the first hole section and the second hole section are communicated and arranged along the direction from the first surface to the second surface of the cover plate;
the sealing nail is connected with the liquid injection hole in a sealing fit manner, and comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected;
the sealing surface of the outer sealing part is abutted against the step surface, the sealing surface of the connecting part is abutted against the inner surface of the second hole section of the liquid injection hole, and the sealing surface of the inner sealing part is abutted against the second surface of the liquid injection hole of the cover plate.
2. The closure assembly of claim 1, wherein,
the sealing nail comprises an outer sealing element and an inner fixing element, wherein the outer sealing element is made of flexible or variable materials, and the inner fixing element is made of rigid or hard materials;
the outer sealing piece comprises an outer sealing part, a connecting part and an inner sealing part which are sequentially connected;
the outer sealing element is also provided with an accommodating groove, and the inner fixing element and the accommodating groove of the outer sealing element are relatively fixed.
3. The closure assembly of claim 2, wherein,
a clamping structure is oppositely arranged between the inner fixing piece and the outer sealing piece so as to clamp and fix the inner fixing piece and the outer sealing piece;
and a blocking part is arranged on the inner fixing piece in the direction close to the first surface of the cover plate, and is used for enabling the sealing nail to be kept on the step surface between the first hole section and the second hole section.
4. The closure assembly of claim 1, wherein,
and a chamfer structure is arranged at the front end part of the inner sealing part along the direction from the first surface to the second surface of the cover plate.
5. The closure assembly of claim 4, wherein,
the chamfer structure is conical.
6. The closure assembly of claim 2, wherein,
the inner fixing piece is sequentially provided with a blocking part, an inner fixing piece connecting part and an inner fixing piece barb part along the direction from the first surface to the second surface of the cover plate,
the accommodating groove of the outer sealing member is matched with the outer contour of the inner fixing member so as to accommodate and fix the inner fixing member.
7. The closure assembly of claim 1, wherein,
the sealing nail is a soft rubber nail made of rubber materials.
8. The closure assembly of claim 2, wherein,
the inner fixing piece is made of hard plastic, hard metal or hard composite material.
9. The closure assembly of claim 2 or 8, wherein,
the outer sealing piece is a soft rubber nail made of rubber materials.
10. A secondary battery, characterized in that,
comprising an electrolyte, a housing and a cover assembly according to any one of claims 1 to 9, wherein the electrolyte is provided in a cavity formed by the cover assembly and the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222533864.2U CN219106326U (en) | 2022-09-22 | 2022-09-22 | Cover plate assembly of secondary battery and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222533864.2U CN219106326U (en) | 2022-09-22 | 2022-09-22 | Cover plate assembly of secondary battery and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219106326U true CN219106326U (en) | 2023-05-30 |
Family
ID=86463298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222533864.2U Active CN219106326U (en) | 2022-09-22 | 2022-09-22 | Cover plate assembly of secondary battery and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219106326U (en) |
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2022
- 2022-09-22 CN CN202222533864.2U patent/CN219106326U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |