CN113745720B - Lithium battery top cover assembly and secondary battery - Google Patents

Lithium battery top cover assembly and secondary battery Download PDF

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Publication number
CN113745720B
CN113745720B CN202110805440.4A CN202110805440A CN113745720B CN 113745720 B CN113745720 B CN 113745720B CN 202110805440 A CN202110805440 A CN 202110805440A CN 113745720 B CN113745720 B CN 113745720B
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Prior art keywords
electrode
top cover
out hole
cover plate
sealing
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CN113745720A (en
Inventor
陈中元
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Wuhan Fuhang Precision Industry Co ltd
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Wuhan Fuhang Precision Industry Co ltd
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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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 & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a lithium battery top cover component, which comprises: a top cover plate; a first seal and a second seal; a first electrode terminal and a second electrode terminal; a lower insulating support; the first fixing piece and the second fixing piece. The electrode terminal is fixed to the sealing member by the positioning protrusion being inserted into the positioning groove. And the main body positioning column is embedded into the electrode leading-out hole and the bracket through hole, so that the sealing element is fixed on the top cover plate and the lower insulating bracket. The inner sides of the periphery of the electrode lead-out holes are provided with a plurality of concave buckles matched with the buckles, the lower insulating support is fixed below the top cover plate, and the embedded parts of the fixing pieces are embedded into the blind holes through injection molding and solidification integrated forming fixing pieces, so that the electrode terminals, the sealing pieces and the top cover plate are tightly fixed and connected from top to bottom in sequence. The invention also discloses a secondary battery with the lithium battery top cover component.

Description

Lithium battery top cover assembly and secondary battery
Technical Field
The invention relates to the field of secondary lithium batteries, in particular to a lithium battery top cover assembly and a secondary battery.
Background
Lithium batteries are a type of battery using a nonaqueous electrolyte solution, which uses lithium metal or a lithium alloy as a negative electrode material, and can be broadly divided into two types: lithium metal batteries and lithium ion batteries. Lithium ion batteries have been developed for a long time, with the advantages of high capacity density, safety, and long cycle time.
As lithium battery technology advances, some of the defective core problems in lithium batteries are also increasingly exposed. Among them, the sealing performance of the electrode is an unavoidable problem in the lithium battery technology. In order to improve the sealing performance, the industry mainly adopts ceramic sealing with good acid and alkali resistance and ageing resistance, and at present, ceramic sealing polar posts, pure copper polar posts, pure aluminum polar posts and ceramic are adopted to braze and then serve as the anode and the cathode of the battery. In order to further improve the cost performance and unit capacity density of lithium ions, the industry further proposes that the copper-aluminum composite pole replaces a pure copper pole, so that the cost is reduced, the quality is reduced, and although the scheme has certain advancement, the implementation is difficult under the current design of the structure and the process. Because the copper-aluminum composite material is subjected to high-temperature brazing, the bonding strength of the copper-aluminum composite material is seriously reduced, and even the copper-aluminum composite material has the problem of falling off.
Because the structure of the pole and the assembly process are complex, the assembly efficiency of the secondary battery can be affected, and after the pole is fixed on the top cover plate, the phenomenon that the pole is disconnected with the top cover plate due to insufficient fixing force is often caused, so that the use reliability of the secondary battery is reduced.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide a top cap assembly of a lithium battery and a secondary battery, which can firmly fix an electrode terminal on a top cap plate, has a simple structure and process, improves the stability and sealing performance of the connection of the top cap assembly, and improves the safety and reliability of the secondary battery.
The technical scheme adopted by the invention for achieving the purpose is as follows:
a lithium battery top cap assembly, comprising:
a top cover plate, wherein one side of the top cover plate is provided with a first electrode lead-out hole, and the other side of the top cover plate is provided with a second electrode lead-out hole;
the first fixing piece is arranged on the top cover plate, and a plurality of first embedded parts extending downwards are arranged on the first fixing piece;
the second fixing piece is arranged on the top cover plate, and a plurality of second embedded parts extending downwards are arranged on the second fixing piece;
the first electrode terminal and the second electrode terminal have the same structure, and the first electrode terminal is arranged on the top cover plate and is positioned right above the first electrode leading-out hole; the second electrode terminal is arranged on the top cover plate and is positioned right above the second electrode leading-out hole;
the outer side of the first electrode leading-out hole is provided with a first sunken part, and the outer side of the second electrode leading-out hole is provided with a second sunken part; a plurality of first blind holes matched with the first embedded part are formed in the first sunken part; the first embedded part is embedded into the first blind hole, and the first electrode terminal is fixed on the top cover plate; a plurality of second blind holes matched with the second embedded parts are formed in the second sunken parts; the second embedded part is embedded into the second blind hole, and the second electrode terminal is fixed on the top cover plate;
the first sealing piece is arranged on the top cover plate and comprises a first main body and a plurality of first positioning convex columns which are arranged on the first main body and extend upwards; the first main body positioning column is arranged on the first main body and extends downwards;
the second sealing piece is arranged on the top cover plate and comprises a second main body and a plurality of second positioning convex columns which are arranged on the second main body and extend upwards; the second main body positioning column is arranged on the second main body and extends downwards;
wherein, a plurality of first positioning grooves matched with the first positioning convex columns are arranged on the first electrode terminal; the first positioning convex column is embedded into the first positioning groove, and the first electrode terminal is fixed on the first sealing piece; a plurality of second positioning grooves matched with the second positioning convex columns are formed in the second electrode terminals; the second positioning convex column is embedded into the second positioning groove, and the second electrode terminal is fixed on the second sealing piece;
the lower insulating bracket is arranged below the top cover plate and comprises a first bracket through hole arranged right below the first electrode leading-out hole and a second bracket through hole arranged right below the second electrode leading-out hole; a plurality of first buckles extending upwards are arranged on the outer sides of the periphery of the first bracket through hole; a plurality of second buckles extending upwards are arranged on the outer sides of the periphery of the second bracket through hole;
wherein, a plurality of first concave buckles matched with the first buckles are arranged on the inner sides of the periphery of the first electrode leading-out hole; a plurality of second concave buckles matched with the second buckles are arranged on the inner sides of the periphery of the second electrode leading-out holes; the first buckle is clamped into the first concave buckle, the second buckle is clamped into the second concave buckle, and the lower insulating support is fixed below the top cover plate;
the first positioning convex column is embedded into the first electrode leading-out hole and the first bracket through hole, and a first sealing piece is fixed on the top cover plate and the lower insulating bracket; the second positioning convex column is embedded into the second electrode leading-out hole and the second bracket through hole, and the second sealing piece is fixed on the top cover plate and the lower insulating bracket.
Further, the first electrode terminal and the second electrode terminal have the same structure and each comprise a first terminal plate, a second terminal plate arranged on the first terminal plate and a third terminal plate arranged on the second terminal plate; the first positioning groove is arranged on the outer side of the periphery of the first terminal plate of the first electrode terminal; the second positioning groove is arranged on the outer side of the periphery of the first terminal plate of the second electrode terminal.
Further, a third electrode leading-out hole is formed in the middle of the first sealing element main body, and the first positioning convex column is arranged at the outer side edge of the third electrode leading-out hole; a fourth electrode leading-out hole is formed in the middle of the second sealing element main body, and the second positioning convex column is arranged at the outer side edge of the fourth electrode leading-out hole.
Further, an explosion-proof valve mounting hole is arranged between the first electrode leading-out hole and the second electrode leading-out hole on the top cover plate; and the surface of the explosion-proof valve mounting hole is provided with a semicircular double exhaust groove.
Further, the outer peripheral surface of the first electrode terminal protrudes from the inner wall of the first electrode lead-out hole; the outer peripheral surface of the second electrode terminal protrudes from the inner wall of the second electrode lead-out hole.
Further, a fourth terminal plate is further disposed on each of the first electrode terminal and the second electrode terminal.
Further, a plurality of first sealing clamping columns extending downwards are formed on the first main body of the first sealing element, and a plurality of first sealing buckles matched with the first sealing clamping columns are formed at the edge of the first electrode leading-out hole; the first sealing clamping column is clamped into the first sealing clamp; a plurality of second sealing clamping columns extending downwards are further formed on the second main body of the second sealing member, and a plurality of second sealing buckles matched with the second sealing clamping columns are arranged at the edge of the second electrode leading-out hole; the second sealing clamping column is clamped into the second sealing clamping buckle.
A secondary lithium battery comprising a housing, an electrode assembly disposed within the housing, and a lithium battery top cap assembly disposed on the housing and electrically connected to the electrode assembly comprising any one of claims 1-7.
Further, an opening is formed in the shell, and the lithium battery top cover assembly covers the opening.
The beneficial effects of the invention are as follows:
(1) The lithium battery top cover assembly is embedded into the first positioning groove through the first positioning convex column, the first electrode terminal is fixed on the first sealing element, the first main body positioning column is embedded into the first electrode leading-out hole and the first bracket through hole, the first sealing element is fixed on the top cover plate and the lower insulating bracket, a plurality of first concave buckles matched with the first buckles are arranged on the inner sides of the periphery of the first electrode leading-out hole, the lower insulating bracket is fixed below the top cover plate, and the first embedded part of the first fixing element is embedded into the first blind hole through injection molding and solidification integrated first fixing element, so that the first electrode terminal, the first sealing element and the top cover plate are tightly fixed and connected in sequence from top to bottom. Meanwhile, the second electrode terminal is fixed on the second sealing element through the second positioning convex column embedded in the second positioning groove, the second main body positioning column is embedded in the second electrode leading-out hole and the second bracket through hole, the second sealing element is fixed on the top cover plate and the lower insulating bracket, a plurality of second concave buckles matched with the second buckles are arranged on the inner sides around the second electrode leading-out hole, the lower insulating bracket is fixed below the top cover plate, the second fixing element is formed by injection molding and solidification, and the second embedding part of the second fixing element is embedded in the second blind hole, so that the second electrode terminal, the second sealing element and the top cover plate are tightly fixed and connected from top to bottom in sequence. The structure has simple process, improves the stability and the tightness of the connection of the top cover assembly, and improves the safety and the reliability of the secondary battery.
(2) Through setting up an explosion-proof valve mounting hole, explosion-proof valve mounting hole surface is equipped with semi-circular double exhaust groove, when the pressure value was reached to the battery internal pressure, can directly lead through with outside through semi-circular double exhaust groove, quick air leakage prevents that the explosion from taking place for the high pressure in the battery box.
(3) The secondary battery provided by the invention has the advantages that the lithium battery top cover assembly is covered on the opening arranged on the shell through arranging the shell, the electrode assembly arranged in the shell and the lithium battery top cover assembly which is arranged on the shell and is electrically connected with the electrode assembly and comprises any one of claims 1 to 8, so that the problem of liquid leakage in the shell of the secondary battery is effectively prevented, the stability and the sealing performance of the secondary battery are improved, and the reliability and the safety of the battery are further improved.
The foregoing is a summary of the invention and is further defined by the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
FIG. 1 is an assembly view of an embodiment with the lower insulating support removed;
FIG. 2 is a schematic view of a top cover plate according to an embodiment;
FIG. 3 is an exploded view of the first embodiment;
FIG. 4 is a partial exploded assembly view of the first embodiment;
fig. 5 is a schematic diagram showing the overall structure of a second electrode terminal according to the first embodiment;
fig. 6 is a sectional view of a second electrode terminal according to the first embodiment;
FIG. 7 is a schematic view showing the overall structure of a second seal member according to the first embodiment;
fig. 8 is an assembly view of a lower insulating holder and a top cover plate of the first embodiment;
fig. 9 is an enlarged view of the portion a;
FIG. 10 is a cross-sectional view of an overall assembly of an embodiment;
fig. 11 is an enlarged view of the portion B;
FIG. 12 is an overall assembled cross-sectional view of the second embodiment;
fig. 13 is an enlarged view of the portion C;
FIG. 14 is an exploded view of the second embodiment;
FIG. 15 is an overall assembled cross-sectional view of the third embodiment;
fig. 16 is an enlarged view of the portion D;
FIG. 17 is an exploded view of the third embodiment;
FIG. 18 is an overall assembled cross-sectional view of the fourth embodiment;
fig. 19 is an enlarged view of the portion E;
FIG. 20 is an exploded view of the fourth embodiment;
fig. 21 is an overall view of the fifth embodiment.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description of the specific embodiments of the present invention is given with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1 to 11, an embodiment of the present invention provides a lithium battery top cap assembly, including
A top cover plate 1, wherein a first electrode lead-out hole 11 is formed on one side of the top cover plate, and a second electrode lead-out hole 12 is formed on the other side of the top cover plate;
a first fixing member 2 disposed on the top cover 1, wherein a plurality of first embedded portions 21 extending downward are disposed on the first fixing member 2;
a second fixing member 3 disposed on the top cover plate 1, wherein a plurality of second embedded portions 31 extending downward are disposed on the second fixing member 3;
the first electrode terminal 4 and the second electrode terminal 5 have the same structure, and the first electrode terminal 4 is arranged on the top cover plate 1 and is positioned right above the first electrode lead-out hole 11; the second electrode terminal 5 is arranged on the top cover plate 1 and is positioned right above the second electrode lead-out hole 12;
wherein, a first concave part 111 is arranged outside the first electrode lead-out hole 11, and a second concave part 121 is arranged outside the second electrode lead-out hole 12; a plurality of first blind holes 112 matching the first embedding portions 21 are formed in the first recessed portion 111; the first embedding part 21 is embedded into the first blind hole 112 to fix the first electrode terminal 4 on the top cover plate 1; a plurality of second blind holes 122 matched with the second embedded parts 31 are formed in the second sunken parts 121; the second insertion portion 31 is inserted into the second blind hole 122 to fix the second electrode terminal 5 to the cap plate 1. Thereby realize spacing to the position of first electrode terminal 4 and second electrode terminal 5, prevent that first electrode terminal 4 and second electrode terminal 5 from taking place to shift or coming off from lamina tecti 1, improved the stability of this subassembly, and then promoted the reliability and the security of battery.
The first sealing element 6 is arranged on the top cover plate 1 and comprises a first main body 61 and a plurality of first positioning convex columns 62 which are arranged on the first main body 61 and extend upwards; a first body positioning post 63 disposed on the first body 61 and extending downward;
the second sealing element 7 is arranged on the top cover plate 1 and comprises a second main body 71 and a plurality of second positioning convex columns 72 which are arranged on the second main body 71 and extend upwards; a second body positioning post 73 disposed on the second body 71 and extending downward;
wherein, the first electrode terminal 4 is provided with a plurality of first positioning grooves 411 matched with the first positioning convex columns 62; the first positioning convex column 62 is embedded in the first positioning groove 411, so that the first electrode terminal 4 is fixed on the first sealing member 6, and the first electrode terminal 4 is prevented from shifting, deflecting and falling off from the first sealing member 6, so that the stability between the first electrode terminal 4 and the first sealing member 6 is improved, and the safety and the reliability of the assembly are further ensured; the second electrode terminal 5 is provided with a plurality of second positioning grooves 511 matched with the second positioning protrusions 72; the second positioning convex columns 72 are embedded into the second positioning grooves 511, and the second electrode terminal 5 is fixed on the second sealing piece 7, so that the second electrode terminal 5 is prevented from shifting, shifting and falling off from the second sealing piece 7, stability and assembly accuracy between the second electrode terminal 5 and the second sealing piece 7 are improved, and safety and reliability of the assembly are further guaranteed.
The lower insulating bracket 8 is arranged below the top cover plate 1 and comprises a first bracket through hole 81 arranged right below the first electrode lead-out hole 11 and a second bracket through hole 82 arranged right below the second electrode lead-out hole 12; a plurality of first buckles 83 extending upwards are arranged on the outer sides of the periphery of the first bracket through holes 81; a plurality of second buckles 84 extending upwards are arranged on the outer sides around the second bracket through holes 82;
wherein, a plurality of first concave buckles 113 matched with the first buckles 83 are arranged on the inner side of the periphery of the first electrode lead-out hole 11; a plurality of second concave buckles 123 matched with the second buckles 84 are arranged on the inner side around the second electrode lead-out hole 12; the first buckle 83 is locked into the first concave buckle 113, and the second buckle 84 is locked into the second concave buckle 123, so as to fix the lower insulating bracket 8 below the top cover plate 1. Through the cooperation between buckle and the concave knot, firmly connected lower part insulating support 8 and lamina tecti 1, and this structural technological process is simple, has reduced the basic cost of this subassembly, has improved the work efficiency and the assembly accuracy of this subassembly, has further guaranteed the security and the reliability of this subassembly.
The first main body positioning column 63 is sequentially embedded into the first electrode lead-out hole 11 and the first bracket through hole 81, the first sealing element 6 is fixed on the top cover plate 1 and the lower insulating bracket 8, so that the position of the first sealing element 6 is limited, the first sealing element 6 is prevented from shifting, shifting and falling off from the top cover plate 1, the fixed connection between the first sealing element 6 and the top cover plate 8 is ensured, the position of the first electrode terminal 4 arranged on the first sealing element 6 is further limited, and the safety and the reliability of the assembly are ensured. The second main body positioning column 73 is sequentially embedded into the second electrode leading-out hole 12 and the second bracket through hole 82, and the second sealing element 7 is fixed on the top cover plate 1 and the lower insulating bracket 8, so that the position of the second sealing element 7 is limited, the second sealing element 7 is prevented from shifting and falling off from the top cover plate 1, the fixed connection between the second sealing element 7 and the top cover plate 1 is ensured, the position of the second electrode terminal 5 arranged on the second sealing element 7 is further limited, and the safety and the reliability of the assembly are ensured.
In this embodiment, the components are assembled together, and finally, injection molding is performed once through an injection molding process, and the molded first fixing piece 2 and second fixing piece 3 respectively tightly fix the first electrode terminal 4 and the second electrode terminal 5 on the top cover plate 1, so as to form an integral sealing structure. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and the tightness of the first electrode terminal 4 and the second electrode terminal 5 after being assembled on the top cover plate 1 is improved, the combination stability between the structures is increased, the fixing force is increased, the performance of the secondary battery is improved, and the reliability of the assembly is improved.
Preferably, the first blind hole 112 and the second blind hole 122 are each in a scarf conical shape.
Preferably, the first positioning boss 62 and the second positioning boss 72 are each in the shape of an upwardly extending wedge.
Preferably, the first female buckle 113 and the second female buckle 123 are both in a stepped shape.
As for the specific structure of the first electrode terminal 4 and the second electrode terminal 5, as shown in fig. 5 to 6, the first electrode terminal 4 and the second electrode terminal 5 have the same structure, and each include a first terminal plate (41, 51), a second terminal plate (42, 52) provided on the first terminal plate (41, 51), and a third terminal plate (43, 53) provided on the second terminal plate (42, 52); the first positioning groove 411 is disposed on the outer side of the periphery of the first terminal plate 41 of the first electrode terminal 4; the second positioning groove 511 is disposed on the outer side around the first terminal plate 51 of the second electrode terminal 5. Preferably, the method is used. The outer peripheral surfaces of the first terminal plates (41, 51) protrude from the peripheral surfaces of the second electrode terminals (42, 52) and the third electrode terminals (43, 53). By providing the first positioning groove 411 on the outer side around the first terminal plate 41 of the first electrode terminal 4, the first positioning groove 411 is better matched with the first positioning convex column 62, so that the connectivity between the first electrode terminal 4 and the first sealing member 6 is improved, and the stability and the sealing performance of the assembly are further improved. By arranging the second positioning grooves 511 on the outer sides around the first terminal plate 51 of the second electrode terminal 5, the second positioning grooves 511 are better matched with the second positioning convex columns 72, the connectivity between the second electrode terminal 5 and the second sealing piece 7 is improved, and the stability and the sealing performance of the assembly are further improved.
In this embodiment, the first electrode terminal 4 is a positive electrode terminal, and preferably, the first electrode terminal is made of an aluminum material; the second electrode terminal 5 is a negative electrode terminal, and is made of a copper-aluminum composite integrated material, wherein the top 55 of the second electrode terminal is aluminum, and the bottom 56 of the second electrode terminal is 1-2mm copper. The materials are flexibly selected according to the design requirements of the secondary lithium battery, and are not limited to the materials and specifications.
Preferably, in the present embodiment, the first electrode terminal 4 and the second electrode terminal 5 have square shapes, so that the first electrode terminal 4 and the second electrode terminal can be conveniently and rapidly positioned during assembly, and the rotation is prevented from being deviated. The shape of the lithium secondary battery is flexibly selected according to the design requirement of the lithium secondary battery, and can be round, oval or other shapes, and is not limited to the square.
In order to better electrically connect the first electrode terminal 4 and the second electrode terminal 5 in the secondary battery, as shown in fig. 3 to 4, a third electrode lead-out hole 611 is further provided in the middle of the first body 61 of the first sealing member 6 and is located directly above the first electrode lead-out hole 11, and the first positioning protrusion 62 is located at an outer edge of the third electrode lead-out hole 611; a fourth electrode lead-out hole 711 located right above the second electrode lead-out hole 12 is further provided in the middle of the second body 71 of the second sealing member 7, and the second positioning boss 72 is located at an outer edge of the fourth electrode lead-out hole 711. By providing the third electrode lead-out hole 611 and the first electrode lead-out hole 11 to be matched, the first electrode terminal 4 is better electrically connected with the components in the secondary lithium battery. By providing the fourth electrode lead-out hole 711 and the second electrode lead-out hole 12 to be mated, the second electrode terminal 5 is better electrically connected to the components in the secondary battery.
In order to prevent the two groups of electrode terminals (4, 5) from falling out of the electrode lead-out holes (11, 12), as shown in fig. 3, 4, 10 and 11, the outer peripheral surface of the first electrode terminal 4 protrudes from the inner wall of the first electrode lead-out hole 11; the outer peripheral surface of the second electrode terminal 5 protrudes from the inner wall of the second electrode lead-out hole 12. By providing the outer peripheral surface of the first electrode terminal 4 protruding from the inner wall of the first electrode lead-out hole 11, the first electrode terminal 4 is prevented from falling out of the first electrode lead-out hole 11, and the assembly is further sealed; through setting up the outer peripheral face protrusion of second electrode terminal 5 in second electrode draws forth hole 12 inner wall, prevent that first electrode terminal 5 from dropping from second electrode draws forth hole 12, further sealed this subassembly to guarantee the normal use of this subassembly, improved the stability and the leakproofness of this subassembly.
In order to better firmly connect the top cover plate 1 and the lower insulating support 8, as shown in fig. 3 to 4 and fig. 9 to 11, the first buckle 83 and the second buckle 84 have the same structure, and each comprises a buckle base (831,841) and a protruding buckle (832,842) disposed on the buckle base (831,841) and extending upwards. Preferably, the cam buckle (832,842) is wedge-shaped. Through the mutual lock of protruding knot (832,842) and concave knot (113, 123), be favorable to the quick direction assembly of lower part insulating support 8 to on lamina tecti 1 to will realize the fixed connection of lower part insulating support 8 and lamina tecti 1, this simple structure technology easily realizes, with low costs, and improved the assembly speed of lower part insulating support 8 and lamina tecti 1, improved the work efficiency of this subassembly.
In order to prevent potential safety hazards caused by excessive pressure of the secondary battery, as shown in fig. 1 to 4, the top cover plate 1 is further provided with an explosion-proof valve mounting hole 13 positioned between the first electrode lead-out hole 11 and the second electrode lead-out hole 12; the surface of the explosion-proof valve mounting hole 13 is provided with a semicircular double exhaust groove 131. When the pressure in the secondary lithium battery reaches the pressure value, the secondary lithium battery can be directly communicated with the outside through the semicircular double exhaust grooves 131, so that air is quickly discharged, and the explosion of high pressure in the battery box is prevented.
Example two
In the first embodiment, the structure of the roof module is explained. In the present embodiment, the differences from the first embodiment are mainly described, and the same structure is not repeated in the present embodiment.
As shown in fig. 12 to 14, the main difference between the second embodiment and the first embodiment is that a fourth terminal plate (44, 54) is further provided on the first electrode terminal 4 and the second electrode terminal 5, respectively, and the fourth terminal plate (44, 54) extends to the bottom surface of the lower insulating support 8 and is level with the bottom surface of the lower insulating support 8.
By arranging the fourth terminal plates (44, 54) to extend to be level with the bottom surface of the lower insulating support 8, the first electrode terminal 4 and the second electrode terminal 5 are better contacted with other parts in the lithium battery, the production efficiency of the assembly is improved, and the production cost of the assembly is reduced.
Example III
In the first embodiment, the structure of the roof module is explained. In this embodiment, the differences from the other embodiments are mainly described, and the same structure is not repeated in this embodiment.
As shown in fig. 15 to 17, the main difference between the third embodiment and the other two embodiments is that the first fixing member 2, the second fixing member 3, the first electrode terminal 4, the second electrode terminal 5, the first sealing member 6, the second sealing member 7, the first electrode lead-out hole 11, the second electrode lead-out hole 12, the third electrode lead-out hole 611, and the fourth electrode lead-out hole 711 are all circular structures.
In order to prevent the rotation problem of the components with the circular structure during the assembly process, as shown in fig. 17, a plurality of first sealing clamping columns 612 extending downward are further formed on the first main body 61 of the first sealing member 6, and a plurality of first sealing buckles 114 matching with the first sealing clamping columns 612 are opened at the edge of the first electrode lead-out hole 11; the first sealing clip 612 is snapped into the first sealing clip 114; a plurality of second sealing clamping columns 712 extending downwards are further formed on the second main body 71 of the second sealing member 7, and a plurality of second sealing buckles 124 matched with the second sealing clamping columns 712 are arranged at the edge of the second electrode lead-out hole 12; the second sealing clip post 712 clips into the second sealing clip 124. The first sealing clamping column 612 is clamped into the first sealing clamping buckle 114 and the second sealing clamping column 712 is clamped into the second sealing clamping buckle 124, so that the first sealing element 6 is prevented from rotating or falling off from the first electrode leading-out hole 11, the second sealing element 7 is prevented from rotating or falling off from the second electrode leading-out hole 12, the stability and the assembly accuracy of the assembly are further improved, and the reliability of the assembly is guaranteed.
Preferably, the first sealing clip 612 and the second sealing clip 712 are semicircular clips, and the first sealing clip 114 and the second sealing clip 124 are corresponding semicircular concave clips. The shape of the lithium secondary battery is flexibly selected according to the design requirement of the lithium secondary battery, and can be round, oval or other shapes, and is not limited to the semicircle.
Example IV
In the first embodiment, the structure of the roof module is explained. In this embodiment, the differences from the other embodiments are mainly described, and the same structure is not repeated in this embodiment.
As shown in fig. 18 to 20, the main difference between the fourth embodiment and the other three embodiments is that a fourth terminal plate (44, 54) is further provided on each of the first electrode terminal 4 and the second electrode terminal 5, and the fourth terminal plate (44, 54) extends to the bottom surface of the lower insulating support 8 and is level with the bottom surface of the lower insulating support 8. At the same time, the first fixture 2, the second fixture 3, the first electrode terminal 4, the second electrode terminal 5, the first seal 6, the second seal 7, the first electrode lead-out hole 11, the second electrode lead-out hole 12, the third electrode lead-out hole 611, and the fourth electrode lead-out hole 711 are all circular structures.
By arranging the fourth terminal plates (44, 54) to extend to be level with the bottom surface of the lower insulating support 8, the first electrode terminal 4 and the second electrode terminal 5 are better contacted with other parts in the lithium battery, the production efficiency of the assembly is improved, and the production cost of the assembly is reduced.
In order to prevent the rotation problem of the components with the circular structure during the assembly process, as shown in fig. 20, a plurality of first sealing clamping columns 612 extending downward are further formed on the first main body 61 of the first sealing member 6, and a plurality of first sealing buckles 114 matching with the first sealing clamping columns 612 are opened at the edge of the first electrode lead-out hole 11; the first sealing clip 612 is snapped into the first sealing clip 114; a plurality of second sealing clamping columns 712 extending downwards are further formed on the second main body 71 of the second sealing member 7, and a plurality of second sealing buckles 124 matched with the second sealing clamping columns 712 are arranged at the edge of the second electrode lead-out hole 12; the second sealing clip post 712 clips into the second sealing clip 124. The first sealing clamping columns 612 are clamped into the first sealing clamping buckles 114 and the second sealing clamping columns 712 are clamped into the second sealing clamping buckles 124, so that the first sealing piece 6 is prevented from rotating or falling off from the first electrode leading-out hole 11, the second sealing piece 7 is prevented from rotating or falling off from the second electrode leading-out hole 12, the stability and the assembly accuracy of the assembly are further improved, and the reliability of the assembly is guaranteed.
Preferably, the first sealing clip 612 and the second sealing clip 712 are semicircular clips, and the first sealing clip 114 and the second sealing clip 124 are corresponding semicircular concave clips. The shape of the lithium secondary battery is flexibly selected according to the design requirement of the lithium secondary battery, and can be round, oval or other shapes, and is not limited to the semicircle.
Through the change of two distinguishing points, the structural selectivity of the assembly is more, the production cost of the assembly is further saved, the fixing force is increased, the performance of the assembly is improved, and the use reliability of the assembly is improved.
Example five
In the first embodiment, the structure of the roof module is explained. In this embodiment, the differences from the other embodiments are mainly described, and the same structure is not repeated in this embodiment.
As shown in fig. 21, the main difference between the fifth embodiment and the other four embodiments is that the present embodiment is a secondary battery 10, which includes a case 101, an electrode assembly 102 disposed in the case 101, and a lithium battery top cap assembly 103 disposed on the case 101 and electrically connected to the electrode assembly 102, including any one of claims 1 to 7. By providing a lithium battery top cap assembly 103 comprising any one of claims 1 to 7 on a case 101, which is electrically connected to an electrode assembly 102, and sealing the electrode assembly 102 to the case 101, the sealability of the battery is improved, the bonding stability between structures is increased, the fixing strength is increased, the performance of the battery is improved, and the reliability of the battery is improved; in addition, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
As shown in fig. 21, for a specific connection manner between the housing 101 and the lithium battery top cap assembly 103, an opening 1011 is provided on the housing 101, and the lithium battery top cap assembly 103 covers the opening 1011. The lithium battery top cover assembly 103 covers the opening 1011, so that the battery is integrally sealed, and the tightness and the combination stability of the battery are improved.
Preferably, the opening 1011 is a cylindrical structure.
For the specific structure of the casing 101, the shape material and the like thereof are flexibly selected according to the design requirement of the secondary lithium battery, the shape thereof can be hexahedral shape or other shapes, and the material can be aluminum, aluminum alloy, plastic and the like.
It should be noted here that the shapes of all the components mentioned in the present invention are not limited to the shapes shown in the drawings, and the shapes of the components may be changed according to specific needs. The housing, the blind hole, the terminal board and other components related to the invention can be general standard components or components known to a person skilled in the art, and the structure, the principle and the control mode of the housing, the blind hole, the terminal board and other components are all known to the person skilled in the art through technical manuals or through routine experimental methods.
The foregoing is merely a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to the above embodiments, so that other structures using the same or similar technical features as those of the above embodiments of the present invention are all within the scope of the present invention.

Claims (9)

1. A lithium battery top cap assembly, characterized in that: comprising
A top cover plate, wherein one side of the top cover plate is provided with a first electrode lead-out hole, and the other side of the top cover plate is provided with a second electrode lead-out hole;
the first fixing piece is arranged on the top cover plate, and a plurality of first embedded parts extending downwards are arranged on the first fixing piece;
the second fixing piece is arranged on the top cover plate, and a plurality of second embedded parts extending downwards are arranged on the second fixing piece;
the first electrode terminal and the second electrode terminal have the same structure, and the first electrode terminal is arranged on the top cover plate and is positioned right above the first electrode leading-out hole; the second electrode terminal is arranged on the top cover plate and is positioned right above the second electrode leading-out hole;
the outer side of the first electrode leading-out hole is provided with a first sunken part, and the outer side of the second electrode leading-out hole is provided with a second sunken part; a plurality of first blind holes matched with the first embedded part are formed in the first sunken part; the first embedded part is embedded into the first blind hole, and the first electrode terminal is fixed on the top cover plate; a plurality of second blind holes matched with the second embedded parts are formed in the second sunken parts; the second embedded part is embedded into the second blind hole, and the second electrode terminal is fixed on the top cover plate;
the first sealing piece is arranged on the top cover plate and comprises a first main body and a plurality of first positioning convex columns which are arranged on the first main body and extend upwards; the first main body positioning column is arranged on the first main body and extends downwards;
the second sealing piece is arranged on the top cover plate and comprises a second main body and a plurality of second positioning convex columns which are arranged on the second main body and extend upwards; the second main body positioning column is arranged on the second main body and extends downwards;
wherein, a plurality of first positioning grooves matched with the first positioning convex columns are arranged on the first electrode terminal; the first positioning convex column is embedded into the first positioning groove, and the first electrode terminal is fixed on the first sealing piece; a plurality of second positioning grooves matched with the second positioning convex columns are formed in the second electrode terminals; the second positioning convex column is embedded into the second positioning groove, and the second electrode terminal is fixed on the second sealing piece;
the lower insulating bracket is arranged below the top cover plate and comprises a first bracket through hole arranged right below the first electrode leading-out hole and a second bracket through hole arranged right below the second electrode leading-out hole; a plurality of first buckles extending upwards are arranged on the outer sides of the periphery of the first bracket through hole; a plurality of second buckles extending upwards are arranged on the outer sides of the periphery of the second bracket through hole;
wherein, a plurality of first concave buckles matched with the first buckles are arranged on the inner sides of the periphery of the first electrode leading-out hole; a plurality of second concave buckles matched with the second buckles are arranged on the inner sides of the periphery of the second electrode leading-out holes; the first buckle is clamped into the first concave buckle, the second buckle is clamped into the second concave buckle, and the lower insulating support is fixed below the top cover plate;
the first positioning convex column is embedded into the first electrode leading-out hole and the first bracket through hole, and a first sealing piece is fixed on the top cover plate and the lower insulating bracket; the second positioning convex column is embedded into the second electrode leading-out hole and the second bracket through hole, and the second sealing piece is fixed on the top cover plate and the lower insulating bracket.
2. The lithium battery top cap assembly according to claim 1, wherein: the first electrode terminal and the second electrode terminal have the same structure and comprise a first terminal plate, a second terminal plate arranged on the first terminal plate and a third terminal plate arranged on the second terminal plate; the first positioning groove is arranged on the outer side of the periphery of the first terminal plate of the first electrode terminal; the second positioning groove is arranged on the outer side of the periphery of the first terminal plate of the second electrode terminal.
3. The lithium battery top cap assembly according to claim 1, wherein: a third electrode leading-out hole is formed in the middle of the first sealing element main body, and the first positioning convex column is arranged at the outer side edge of the third electrode leading-out hole; a fourth electrode leading-out hole is formed in the middle of the second sealing element main body, and the second positioning convex column is arranged at the outer side edge of the fourth electrode leading-out hole.
4. The lithium battery top cap assembly according to claim 1, wherein: the top cover plate is also provided with an explosion-proof valve mounting hole positioned between the first electrode leading-out hole and the second electrode leading-out hole; and the surface of the explosion-proof valve mounting hole is provided with a semicircular double exhaust groove.
5. The lithium battery top cap assembly according to claim 1, wherein: the outer peripheral surface of the first electrode terminal protrudes out of the inner wall of the first electrode lead-out hole; the outer peripheral surface of the second electrode terminal protrudes from the inner wall of the second electrode lead-out hole.
6. The lithium battery top cap assembly according to claim 2, wherein: the first electrode terminal and the second electrode terminal are respectively provided with a fourth terminal plate.
7. The lithium battery top cap assembly according to any one of claims 1 to 6, wherein: a plurality of first sealing clamping columns extending downwards are further formed on the first main body of the first sealing member, and a plurality of first sealing buckles matched with the first sealing clamping columns are arranged at the edge of the first electrode leading-out hole; the first sealing clamping column is clamped into the first sealing clamp; a plurality of second sealing clamping columns extending downwards are further formed on the second main body of the second sealing member, and a plurality of second sealing buckles matched with the second sealing clamping columns are arranged at the edge of the second electrode leading-out hole; the second sealing clamping column is clamped into the second sealing clamping buckle.
8. A secondary battery, characterized in that: comprising a case, an electrode assembly disposed in the case, and a cap assembly including any one of claims 1 to 7 disposed on the case and electrically connected to the electrode assembly.
9. The secondary battery according to claim 8, wherein: an opening is formed in the shell, and the lithium battery top cover assembly covers the opening.
CN202110805440.4A 2021-07-16 2021-07-16 Lithium battery top cover assembly and secondary battery Active CN113745720B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202651222U (en) * 2012-05-22 2013-01-02 比亚迪股份有限公司 Cover plate assembly, single battery comprising cover plate assembly and battery pack
CN108428823A (en) * 2017-08-30 2018-08-21 宁德时代新能源科技股份有限公司 Secondary cell's top cap subassembly and secondary cell
CN108963122A (en) * 2018-06-14 2018-12-07 宁德时代新能源科技股份有限公司 Top cap assembly and secondary battery
CN112736339A (en) * 2020-12-30 2021-04-30 武汉富航精密工业有限公司 Injection molding assembly method of secondary battery top cover assembly and top cover assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105845851B (en) * 2016-06-07 2018-07-17 宁德时代新能源科技股份有限公司 Power battery top cover and power battery thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202651222U (en) * 2012-05-22 2013-01-02 比亚迪股份有限公司 Cover plate assembly, single battery comprising cover plate assembly and battery pack
CN108428823A (en) * 2017-08-30 2018-08-21 宁德时代新能源科技股份有限公司 Secondary cell's top cap subassembly and secondary cell
CN108963122A (en) * 2018-06-14 2018-12-07 宁德时代新能源科技股份有限公司 Top cap assembly and secondary battery
CN112736339A (en) * 2020-12-30 2021-04-30 武汉富航精密工业有限公司 Injection molding assembly method of secondary battery top cover assembly and top cover assembly

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