CN219123344U - Top cover structure of secondary battery - Google Patents
Top cover structure of secondary battery Download PDFInfo
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- CN219123344U CN219123344U CN202223327227.6U CN202223327227U CN219123344U CN 219123344 U CN219123344 U CN 219123344U CN 202223327227 U CN202223327227 U CN 202223327227U CN 219123344 U CN219123344 U CN 219123344U
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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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Abstract
A top cover structure of a secondary battery comprises a top cover body, wherein two ends of the top cover body are provided with an electrode via hole; the electrode assembly comprises two electrode assemblies, the two electrode assemblies are respectively embedded into electrode through holes at two ends of a top cover body, a welding ring is arranged at the bottom of a ceramic sealing ring, at least one supporting table is arranged on the welding ring, a plurality of welding lugs are arranged at the edge of the welding ring, a plurality of welding grooves matched with the welding lugs are formed in the top cover body, the welding grooves are circumferentially formed in one side of the electrode through holes, the welding ring can be welded on the top cover body through the adaptation of the welding lugs and the welding grooves, and when the welding ring is welded on the top cover body, the ceramic sealing ring is embedded into the electrode through holes. The utility model has simple structure, less assembly procedures between the electrode assembly and the top cover body, reduced production cost, reduced deformation between the ceramic sealing ring and the welding ring and good sealing property.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a top cover structure of a secondary battery.
Background
As the key parts of electric automobile, the power battery has great influence on the power performance, economy and safety of the whole automobile, and the current square hard-shell battery top cover generally comprises a top cover body, a pole, an upper plastic, a lower plastic, a sealing ring and other parts, wherein the sealing ring belongs to the key parts of top cover air tightness. However, the sealing rings in the existing batteries are mostly made of rubber materials, and have the problems of long-term creep, aging and the like, so that the leakage phenomenon exists; meanwhile, the assembly process of the sealing ring is complicated, the production efficiency is affected, and the production cost is greatly improved.
At present, the prior art solves the problems that sealing ceramic is applied to a top cover of a battery, but the environment temperature of the sealing connection of a ceramic sealing ring and a welding ring of an electrode assembly in the assembly process is high, sealing piece deformation exists, strength is reduced, the flatness of an electrode terminal is affected, a module welding busbar is uneven, cold joint is caused, and the like, so that the difficulty of a module forming process is increased, the manufacturing reject ratio is increased, and the practical application and development of the module welding busbar in the new energy field are affected.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, provides a secondary battery top cover structure, and solves the problems of complex assembly procedures and low production efficiency of a sealing ring in the prior art; meanwhile, the problems that in the assembly process of the electrode assembly, the environment temperature of the sealing connection of the ceramic sealing ring and the welding ring is high, the welding ring is deformed, the strength is reduced, the flatness of an electrode terminal is affected, the module welding busbar is uneven, the virtual welding is caused, the difficulty of a module forming process is increased, the manufacturing reject ratio is increased, and the practical application and development of the module welding busbar in the new energy field are affected are solved.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
a secondary battery top cover structure, comprising:
the top cover body is provided with an electrode via hole at two ends;
the electrode assemblies are respectively embedded into electrode through holes at two ends of the top cover body, each electrode assembly comprises an electrode terminal and a ceramic sealing ring, a fixing part of each electrode terminal is welded on the welding end face of each ceramic sealing ring, and the other end connecting part penetrates through each ceramic sealing ring;
the ceramic sealing ring is characterized in that a welding ring is arranged at the bottom of the ceramic sealing ring and is in sealing connection with the top cover body, at least one supporting table is arranged on one end face of the welding ring, the ceramic sealing ring is in sealing connection with the supporting table, and when the ceramic sealing ring is connected to the welding ring, the electrode terminal penetrates through the ceramic sealing ring and the welding ring.
Further, the edge of the welding ring is provided with a plurality of welding lugs, the top cover body is provided with a plurality of welding grooves matched with the welding lugs, the welding grooves are circumferentially arranged on one side of the electrode through holes, the welding ring can be welded on the top cover body through the adaptation of the welding lugs and the welding grooves, and when the welding ring is welded on the top cover body, the ceramic sealing ring is embedded in the electrode through holes.
Further, the welding groove is arranged on the top cover body, and the welding groove is a through groove.
Further, the support table may be one or more stepped layers.
Further, a support table is arranged on one side edge of the welding ring along the circumferential direction of the welding ring, and the support table and the welding ring are integrally formed.
Further, the electrode terminal comprises a fixing part and a connecting part, wherein the connecting part is fixedly arranged on the bottom surface of the fixing part, the bottom surface of the fixing part is connected to the welding end surface in a sealing way, and the connecting part penetrates through the ceramic sealing ring and the welding ring.
Further, the edge of the welding ring is provided with a circle of reinforcing ribs along the circumference.
The utility model has the following beneficial effects:
1) The electrode assembly comprises an electrode terminal and a ceramic sealing ring, wherein the fixing part of the electrode terminal can be brazed on the ceramic sealing ring firstly, then the ceramic sealing ring is in sealing connection with the supporting table, then a welding lug on the welding ring is embedded into a welding groove on the top cover body from the bottom surface of the top cover body, and finally the welding lug is welded and fixed on the top cover body; and simultaneously, the creep resistance and the ageing resistance of the sealing structure are greatly improved.
2) The ceramic sealing ring is welded on the welding ring through one end face of the supporting table, the supporting table on the welding ring plays a reinforcing role, and meanwhile absorbs heat to relieve thermal deformation during welding, so that the flatness of the electrode terminal is guaranteed, the flatness of the module welding busbar is guaranteed, defects such as cold welding and the like can not occur, the module forming process is simplified, the rate of excellent products is improved, and the module welding busbar is promoted to be practically applied and developed in the field of new energy.
Drawings
FIG. 1 is an exploded view of the structure of the device of the present utility model;
FIG. 2 is a schematic view showing a mounting structure between an electrode assembly and a cap body according to the present utility model;
FIG. 3 is a schematic cross-sectional view showing the assembly of the electrode assembly with the cap body according to the present utility model;
FIG. 4 is an enlarged partial schematic view of an assembled section between an electrode assembly and a cap body according to the present utility model
FIG. 5 is a schematic structural view of a ceramic seal ring according to the present utility model;
FIG. 6 is a schematic view of the bottom structure of the top cover body according to the present utility model;
in the figure: 1. a top cover body; 11. an electrode via; 12. a welding groove; 2. an electrode assembly; 21. an electrode terminal; 211. a fixing part; 212. a connection part; 22. a ceramic seal ring; 221. welding the end face; 3. a weld ring; 31. welding lugs; 32. a support table; 4. reinforcing ribs.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 6, a secondary battery top cover structure includes
The electrode structure comprises a top cover body 1, wherein two ends of the top cover body 1 are respectively provided with an electrode via hole 11;
the electrode assemblies 2 are respectively embedded into the electrode through holes 11 at the two ends of the top cover body 1, the electrode assemblies 2 comprise electrode terminals 21 and ceramic sealing rings 22, fixing parts 211 of the electrode terminals 21 are welded on the upper end surfaces of the ceramic sealing rings 22, and connecting parts 212 of the electrode terminals 21 penetrate through the ceramic sealing rings 22;
the bottom of the ceramic sealing ring 22 is provided with a welding ring 3, the edge of the welding ring 3 is provided with a plurality of welding lugs 31, one side end surface of the welding ring 3 provided with the welding lugs 31 is provided with a supporting table 32, the ceramic sealing ring 22 is fixedly welded on the supporting table 32, and when the ceramic sealing ring 22 is welded on the welding ring 3, the electrode terminal 21 penetrates through the ceramic sealing ring 22 and the welding ring 3;
the top cover body 1 is provided with a plurality of welding grooves 12 matched with the welding lugs 31, the welding grooves 12 are circumferentially arranged on the outer side of the electrode through holes 11, the welding rings 3 can be welded on the top cover body 1 through the matching of the welding lugs 31 and the welding grooves 12, and when the welding rings 3 are welded on the top cover body 1, the ceramic sealing rings 22 are embedded into the electrode through holes 11.
Example 2
The distinguishing features of this embodiment from specific embodiment 1 are that: the welding groove 12 is disposed on the bottom surface of the top cover body 1, and the welding groove 12 is a non-through groove.
This embodiment can reduce the opening of the through hole on the top cover body 1, and ensure the sealability of the top cover body 1.
Example 3
The distinguishing features of this embodiment from specific embodiment 1 are that: the supporting table 32 is a plurality of step layers, and the end surface of the supporting table 32 is welded and fixed with the welding end surface 221.
This embodiment can cushion thermal deformation of the sealing connection of the ceramic seal ring 22 and the weld ring 3, increase the strength of the weld ring, and ensure the flatness of the electrode terminal 21.
When the electrode assembly is assembled, the fixing part 211 of the electrode terminal 21 can be brazed on the welding end face 221, then the ceramic sealing ring 22 and the supporting table 32 on the welding ring 3 are brazed and fixed, then the welding lug 31 on the welding ring 3 is embedded into the welding groove 12 of the top cover body 1 from the bottom surface of the top cover body 1, and finally the welding lug 31 is welded and fixed on the top cover body 1, so that the welding and fixing of the electrode assembly 2 on the top cover body 1 are completed.
In the utility model, the welding end surface 221 of the ceramic sealing ring 22 is fixed on the welding ring 3 through welding with the supporting table 32 of the welding ring 3, the supporting table 32 plays a role in strengthening in the high-temperature welding process, and simultaneously absorbs heat to relieve thermal deformation during welding, so that the planeness of the electrode terminal 21 is ensured; in addition, the reinforcing ribs 4 also play a reinforcing role, so that the flatness of the module welding busbar is guaranteed, defects such as cold welding and the like can not occur, the module forming process is simplified, and the rate of the product is improved. Meanwhile, the electrode assembly 2 can be independently assembled with the top cover body 1 in a welding way after the assembly of the assemblies is completed, so that the assembly procedure between the electrode assembly 2 and the top cover body 1 is simplified, the assembly efficiency is improved, and the production cost is reduced. In addition, the ceramic seal ring 22 is adopted in the sealing structure, so that the creep resistance and the ageing resistance of the top cover are greatly improved.
The above-described embodiments are illustrative of the present utility model and are not intended to be limiting, and it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the spirit and scope of the present utility model as defined by the appended claims and their equivalents.
Claims (7)
1. A secondary battery top cover structure, comprising:
the top cover body is provided with an electrode via hole at two ends;
the electrode assemblies are respectively embedded into electrode through holes at two ends of the top cover body, each electrode assembly comprises an electrode terminal and a ceramic sealing ring, a fixing part of each electrode terminal is welded on the welding end face of each ceramic sealing ring, and the other end connecting part penetrates through each ceramic sealing ring;
the welding device is characterized in that a welding ring is arranged at the bottom of the ceramic sealing ring and is in sealing connection with the top cover body, at least one supporting table is arranged on one end face of the welding ring, the ceramic sealing ring is in sealing connection with the supporting table, and when the ceramic sealing ring is connected to the welding ring, the electrode terminal penetrates through the ceramic sealing ring and the welding ring.
2. The secondary battery top cover structure according to claim 1, wherein a plurality of welding lugs are arranged on the edge of the welding ring, a plurality of welding grooves matched with the welding lugs are arranged on the top cover body, the welding grooves are circumferentially arranged on one side of the electrode through holes, the welding ring can be welded on the top cover body through the adaptation of the welding lugs and the welding grooves, and when the welding ring is welded on the top cover body, the ceramic sealing ring is embedded into the electrode through holes.
3. The secondary battery top cover structure according to claim 2, wherein the welding groove is provided on the top cover body, and the welding groove is a through groove.
4. The secondary battery top cover structure according to claim 1, wherein the support stand is one or more stepped layers.
5. The secondary battery top cover structure according to claim 1, wherein a support stand is provided at one side edge of the welding ring along a circumferential direction thereof, the support stand being integrally formed with the welding ring.
6. The secondary battery top cover structure according to claim 1, wherein the electrode terminal comprises a fixing portion and a connecting portion, the connecting portion is fixedly arranged on the bottom surface of the fixing portion, the bottom surface of the fixing portion is connected to the welding end surface in a sealing manner, and the connecting portion penetrates through the ceramic sealing ring and the welding ring.
7. The secondary battery top cover structure according to claim 1, wherein the edge of the welding ring is provided with a ring of reinforcing ribs along the circumferential direction thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223327227.6U CN219123344U (en) | 2022-12-13 | 2022-12-13 | Top cover structure of secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223327227.6U CN219123344U (en) | 2022-12-13 | 2022-12-13 | Top cover structure of secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219123344U true CN219123344U (en) | 2023-06-02 |
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ID=86530383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223327227.6U Active CN219123344U (en) | 2022-12-13 | 2022-12-13 | Top cover structure of secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219123344U (en) |
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2022
- 2022-12-13 CN CN202223327227.6U patent/CN219123344U/en active Active
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