CN109920943A

CN109920943A - A kind of lithium ion battery sealing element

Info

Publication number: CN109920943A
Application number: CN201811379850.1A
Authority: CN
Inventors: 王银洲
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-20
Filing date: 2018-11-20
Publication date: 2019-06-21

Abstract

The invention discloses a kind of lithium ion battery sealing elements, including top cover, explosion rupture disk, hole plate washer, orifice plate, the small aluminium flake, sealing ring set gradually；Bound edge becomes an entirety again for top covering flange and explosion rupture disk perimeter line postwelding；Orifice plate, which is buckled on the plate washer of hole, becomes an entirety；By the entirety of orifice plate and hole plate washer mounted in the explosion-proof component with top cover；Small aluminium flake is placed on to attach with the orifice plate and explosion rupture disk salient point for having central through hole simultaneously among orifice plate and is connected, orifice plate is connect with small aluminium flake by 3 points or multiple spot laser welding again, salient point is welded to connect among small aluminium flake and explosion rupture disk, the small aluminium flake of preceding processes sub-assembly is finally packed into downwards to the sealing ring of the modification of inside and outside gluing, top cover, orifice plate sub-assembly use the special hardness iron charge and aluminium different from commonly using, and realize the sealing performance of high standard；Using poly- to the modified sealant of phenyl ester, has high-intensitive, ageing-resistant, corrosion-resistant, resistant to high temperature performance.

Description

A kind of lithium ion battery sealing element

Technical field

The present invention relates to lithium ion battery technologies, and in particular to a kind of lithium ion battery sealing element.

Background technique

Lithium ion battery is that a kind of power density is big, can be quickly charged and discharged, long service life, has become battery power The mainstream in market, and be widely used in automotive powerplant, energy storage device, electric tool, electronic apparatus, emergency equipment and Military field etc..With the development of society, performance of the people to lithium ion battery, especially to the reliability of lithium ion battery More stringent requirements are proposed with safety.Battery sealing-performance, CID power-off power, Vent opening force as influence battery reliability and The important link of safety is technological difficulties and emphasis in cell production process.

Currently, seal assembly disclosed in lithium ion battery once disclosed among orifice plate partially over after ironed and explosion rupture disk it Between using laser welding be connected.Inventor can be gone out during actual utilization by the discovery that studies for a long period of time, this welding manner It is now following insufficient: after part is ironed between in the orifice plate, to be become by ironed region material hardness, density, tensile strength with respect to raw material It must not quietly fluctuate larger, after explosion rupture disk welding, CID cutting power is unstable, fluctuates big, and consistency is poor, Easily cause wire drawing, precisely, even temperature does not continue to increase power-off pressure after battery runs down after causing inner pressure of battery to increase, it will The on fire of battery or explosion are caused, the reliability and safety that battery uses are influenced.

The existing open explosion rupture disk disclosed is that whole face is inwardly projecting, and groove direction is consistent with protrusion direction, is assembled in battery After the completion and electrolyte contacts.This frame mode will appear following deficiency during practice: explosion rupture disk whole face is convex Out, the fine difference of material hardness, thickness, production precision etc., can all cause the significant change of Vent opening force.This structure High to the coherence request of production equipment precision, raw material hardness, purity, tensile strength etc., equipment funds investment is big；Separately Outside, the inside groove of explosion rupture disk (with electrolyte contacts), it may appear that following insufficient: explosion rupture disk groove production process is to pass through part It is extruded from by force, " dust " intrusion is had in mold production process, dust is squeezed by groove formed punch, can be inlaid into material (explosion rupture disk) surface, this dust being panelized can't are washed off clearly, after assembling with electrolyte contacts, this " dust " can pair Inside battery substance pollutes, and influences battery chemistries performance.

Summary of the invention

In view of the deficiencies of the prior art, the technical problem to be solved in the present invention is to provide a kind of battery sealing-performance, CID are disconnected Electric power, Vent opening force high stability, reliability, safety lithium ion battery cover；The invention solves another technology Problem is to provide one kind and is applied to semitight battery so as to maintain cell internals intimate contact with one another always to reduce The internal resistance of cell, the overcurrent for improving charge and discharge, inner pressure of battery increase the nut cap that CID is precisely powered off and Vent is precisely opened Structure and technique.

The purpose of the present invention is achieved through the following technical solutions: a kind of lithium ion battery sealing element, including according to Top cover, explosion rupture disk, hole plate washer, orifice plate, the small aluminium flake, sealing ring of secondary setting；It further include top covering flange and explosion rupture disk perimeter line Bound edge becomes an entirety to postwelding again；Orifice plate, which is buckled on the plate washer of hole, becomes an entirety；By the entirety of orifice plate and hole plate washer Small aluminium flake attaching connection is put in centre on the explosion-proof component with top cover, then outside orifice plate, then orifice plate and small aluminium flake are led to 4 dot lasers welded connecting is crossed, salient point is welded to connect among small aluminium flake and explosion rupture disk, finally by the small aluminium flake of preceding processes sub-assembly It is packed into the sealing ring of inside and outside gluing downwards.

The most important innovative point of the present invention first is that: firstly, not over part material squeezed among orifice plate thinning Usual method, but the orifice plate and explosion rupture disk deformation small aluminium flake with have intermediate throughholes by not received any external force extruding etc. Intermediate projections point attaches the component after laser welding simultaneously, by above technical scheme, be utilized small aluminium flake former material hardness, The uniform and stable consistency of thickness, tensile strength realizes the accurate and consistency of CID power-off power and improves lithium-ion electric The safety in pond.

Another innovative point of the invention is: after top cover is combined with explosion rupture disk, in lid periphery laser wire bonding, recycling anti- Top cover bound edge is passed through above technical scheme, reality without the arc-welding after the common explosion rupture disk of use and top cover bound edge by quick-fried Fitting closely as an entirety for top cover and explosion rupture disk is showed, the internal resistance of nut cap being effectively reduced.

Further, in order to improve the safety of battery, orifice plate designs 9 pore structures, in the support strength for ensuring orifice plate Meanwhile increasing the perforated area of orifice plate as far as possible, it realizes that internal pressure when cell internal pressure increases quickly is released, improves electricity The safety in pond.

Further, in order to improve battery Vent opening force stability, reliability, safety, explosion rupture disk is arranged to put down Face, double crimpings, including round shape, kidney-shaped shape, fan shape or compound crimping, and band boss structure is set in centre.

Further, to improve working efficiency and reducing equipment investment fund simultaneously, using by small aluminium flake and orifice plate and anti- Quick-fried intermediate salient point once completes spot welding or electric resistance welding manufacture craft after being bonded simultaneously, with insulation between orifice plate and explosion rupture disk The connection of orifice plate pad support.

Further, inventor studies for a long period of time discovery, usual top cover HV80~130 ° nickel plating iron charge, orifice plate H14~H24 The nut cap of aluminium composition, nut cap are squeezed during battery seal by external force, and because hardness and intensity are lower, will cause battery has Leakage risk, to improve battery hermetization, top cover uses special hard plating aluminum material system using special hardness iron material, orifice plate Make technique, effectively ensure the impact resistant strength of support strength of nut cap during battery seal, battery falling process, realizes The sealing performance of high standard.

In view of soluble poly, to phenyl ester, performance high-intensitive, ageing-resistant, corrosion-resistant, resistant to high temperature, sealant are preferably poly- pair Phenyl ester modified material, while insulation spacer is preferably also poly- to phenyl ester material.

It is that could be used without having received the deformation raw material such as any external force extruding the invention has the following beneficial effects: the present invention Small aluminium flake attaches the component after laser welding or resistance welding with salient point among the orifice plate and explosion rupture disk that have intermediate throughholes simultaneously, Accurate CID power-off power and consistency and the safety for improving lithium ion battery are realized, while improving charge or discharge Overcurrent；After the present invention is combined using top cover with explosion rupture disk, in lid periphery laser wire bonding, recycle explosion rupture disk by top cover packet Side technique realizes the extremely low internal resistance of nut cap；Orifice plate of the present invention uses 9 holes or porous large area structure, realizes that inner pressure of battery is fast Speed is released, and the safety of battery is improved；Explosion rupture disk is arranged to plane, double crimpings and compound crimping, Intermediate Gray boss structure, Realize battery Vent opening force stability, consistency；After salient point among small aluminium flake and orifice plate and explosion rupture disk is bonded simultaneously Spot welding manufacture craft to improve working efficiency, while reducing equipment investment fund；Top cover, orifice plate sub-assembly use with Different special hardness iron charge and aluminium are commonly used, realizes the sealing performance of high standard；Using poly- to the modified sealant of phenyl ester, tool Performance high-intensitive, ageing-resistant, corrosion-resistant, resistant to high temperature, while increasing by two protrusion muscle lines with interior bottom section on the inside of close circle Circle, improves the sealing performance of battery.

Detailed description of the invention

Fig. 1 is structural schematic diagram of the invention.

Fig. 2 is the floor map of symmetrical fan-shaped embodiment of the invention.

Fig. 3 is the floor map of symmetrical round shape embodiment of the invention.

Fig. 4 is the floor map of symmetrical kidney-shaped shape embodiment of the invention.

Fig. 5 is the floor map of the asymmetric fan-shaped embodiment of the present invention.

Fig. 6 is the floor map of symmetrical composite-like embodiment of the invention.

Fig. 7 is the test result figure of first embodiment of the invention.

Fig. 8 is the test result figure of second embodiment of the invention.

Fig. 9 is the test result figure of second embodiment of the invention.

Figure 10 is the test result figure of third embodiment of the invention.

Figure 11 is the test result figure of third embodiment of the invention.

1- top cover, 2- explosion rupture disk, the hole 3- plate washer, 4- orifice plate, the small aluminium flake of 5-, 6- sealing ring.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained all without creative labor Other embodiments shall fall within the protection scope of the present invention.

Fig. 1 is structural schematic diagram of the invention, a kind of lithium ion battery sealing element as shown in Figure 1, including is set gradually Top cover 1, explosion rupture disk 2, washer 3, orifice plate 4, small aluminium flake 5, sealing ring 6,1 flange of top cover and the 2 perimeter line postwelding of explosion rupture disk Bound edge becomes an entirety again；The orifice plate 4, which is buckled on the hole plate washer 3, becomes an entirety；By the orifice plate 4 and institute The entirety of hole plate washer 3 is stated mounted in the explosion-proof component with the top cover 1；By small aluminium flake 5 be placed among the orifice plate 4 simultaneously with The orifice plate 4 and 2 salient point of the explosion rupture disk for having central through hole attach connection, then the orifice plate 4 and the small aluminium flake 5 are led to Cross or the connection of multiple spot laser welding at 3 points, the small aluminium flake 5 is welded to connect with the intermediate salient point of the explosion rupture disk 2, finally by front Small aluminium flake 5 described in process step combinations part is packed into downwards the sealing ring 6 of the modification of inside and outside gluing.

Small aluminium flake 5 be do not received any external force squeeze etc. deformations hardness, thickness, tensile strength it is uniform pure Aluminium raw material and there is a central through hole, the orifice plate 4 and the intermediate salient point of the explosion rupture disk 2 attach the group after laser welding simultaneously Part.

Small aluminium flake 5 is attached to the 4 top surface intermediate region of the orifice plate of central through hole, uses in small 5 region of aluminium flake Laser circumference etc. sets at 3 points to connect up to circumference soldering, and small aluminium flake 5 has been placed in centre bore, the 4 end face center region of orifice plate, It is attached simultaneously with 4 top surface of orifice plate and 2 salient point top surface of the explosion rupture disk, primary process is welded, Laser Welding or resistance are soldered At.

After top cover 1 is combined with the explosion rupture disk 2, described 1 circumferential periphery of top cover etc. divide laser multiple spot welding or arc-welding or Wire bonding recycles 2 periphery of explosion rupture disk by 1 bound edge of top cover compacting combination process connection.

Top cover 1 uses special hardness iron charge, and the orifice plate 4 uses special hardness aluminium selection technique.

Sealing ring 6 is that insulation is excellent, intensity is high, ageing-resistant, dimensionally stable, creep are poly- pair small, corrosion-resistant, resistant to high temperature Phenyl ester modified materials, while increasing by two protrusion muscle coils with interior bottom section on the inside of close circle, the hole plate washer 3 is also using poly- To phenyl ester insulation excellent material.

Vent opening force stability, reliability, safety, the explosion rupture disk 2 are arranged to plane, double crimpings, round shape, waist Shape, fan shape or compound crimping, Intermediate Gray boss structure.

Wherein, the nut cap is round or rectangular.

Embodiment 1, product examine test card: performing leak test-high/low temperature loop test.

Test condition: full electric battery core is subjected to -40 DEG C~85 DEG C high/low temperature circulations, totally 10 loop tests.

Test result: as shown in Figure 7.

Conclusion: for lithium ion battery cover sealing element of the invention under low temperature and temperature difference amplitude overall situation, leakproofness is bright The aobvious cap sealed part better than traditional approach.

Test condition: four kinds of different seal (nut cap) battery bottoms are punched applied voltage test, in standard by embodiment two The comparison of CID response speed is carried out under 1.1 ± 0.2MPa of pressure.

Test result: as shown in Figure 8 and Figure 9, master drawing 1, master drawing 2, master drawing 3 is conventional seals nut cap, and master drawing 4 is this Invention sealing element nut cap.

Conclusion: lithium ion battery sealing element nut cap of the present invention battery seal shown in (master drawing 4) under standard pressure CID response speed is most fast, cracking pressure is most quasi-, and safety is better than master drawing 1, master drawing 2 and sample traditional sealing element shown in Fig. 3 Nut cap.

Test condition: four kinds of different battery seals are punched applied voltage test in battery bottom, in standard pressure by embodiment 3 The comparison of Vent response speed is carried out under 2.15 ± 0.2MPa of power.

Test result: as shown in Figure 10 and Figure 11, master drawing 1, master drawing 2, master drawing 3 are conventional seals nut cap, and master drawing 4 is Sealing element nut cap of the present invention.

Conclusion: lithium ion battery sealing element nut cap of the present invention under standard pressure (master drawing 4) Vent response speed it is most fast, Cracking pressure is most quasi-, and safety is better than master drawing 1, master drawing 2 and sample conventional seals nut cap shown in Fig. 3.

It obtains in conjunction with the embodiments, lithium ion battery provided by the invention realizes reliable sealing with sealing element nut cap, and mentions High safety, and the fields such as automotive powerplant, energy storage device, electric tool, electronic apparatus are able to satisfy to leakproofness It is required that.

In the present invention unless specifically defined or limited otherwise, term " installation ", " setting ", " connection ", " fixation ", Terms such as " being screwed on " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary The interaction relationship of connection or two elements inside two elements, unless otherwise restricted clearly, for the general of this field For logical technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that coming for those of ordinary skill in the art It says, under the premise of not departing from the present invention, various modifications and improvements can be made, these belong to protection model of the invention It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims

1. a kind of lithium ion battery sealing element, including top cover (1), explosion rupture disk (2), the hole plate washer (3), orifice plate set gradually (4), small aluminium flake (5), sealing ring (6)；It is characterized in that, top cover (1) flange and the explosion rupture disk (2) perimeter line postwelding are again Bound edge becomes an entirety；The orifice plate (4), which is buckled on the hole plate washer (3), becomes an entirety；By the orifice plate (4) with The entirety of the hole plate washer (3) is mounted in the explosion-proof component with the top cover (1)；Small aluminium flake (5) is placed in the orifice plate (4) Between simultaneously with have central through hole the orifice plate (4) and the explosion rupture disk (2) salient point attach connect, then by the orifice plate (4) with The small aluminium flake (5) is connected by 3 points or multiple spot laser welding, and the small aluminium flake (5) and the explosion rupture disk (2) intermediate salient point weld It connects in succession, small aluminium flake (5) described in preceding processes sub-assembly is finally packed into downwards to the sealing ring of the modification of inside and outside gluing (6)。

2. in a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: the small aluminium flake (5) is that do not have Have and has received the uniform fine aluminium raw material of hardness, thickness, tensile strength of deformations such as any external force extruding and had central through hole , the orifice plate (4) and the intermediate salient point of the explosion rupture disk (2) attach the component after laser welding or resistance welding simultaneously.

3. a kind of lithium ion battery sealing element according to claim 1 or 2, it is characterised in that: the small aluminium flake (5) attaches In the orifice plate (4) top surface intermediate region of central through hole, set at 3 points using laser circumference etc. in small aluminium flake (5) region To be connected up to circumference soldering.

4. a kind of capacitor of lithium ion battery sealing element according to claim 1 or 2, it is characterised in that: the small aluminium Piece (5) has been placed in centre bore, and orifice plate (4) the end face center region is convex with the orifice plate (4) top surface and the explosion rupture disk (2) Point top surface attaches simultaneously, primary process welding is completed.

5. a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: the top cover (1) is prevented with described After quick-fried (2) combination, divide laser multiple spot welding or arc-welding or wire bonding in the top cover (1) circumferential periphery etc., recycles described anti- Quick-fried (2) periphery connects the top cover (1) bound edge compacting combination process.

6. a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: the top cover (1) is using special Hardness iron charge, the orifice plate (4) use special hardness aluminium selection technique.

7. a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: the sealing ring (6) is insulation It is excellent, intensity is high, ageing-resistant, dimensionally stable, creep are small, corrosion-resistant, resistant to high temperature poly- to phenyl ester modified materials, while on the inside of close circle Increase by two protrusion muscle coils with interior bottom section, the hole plate washer (3) is also using poly- to phenyl ester insulation excellent material.

8. a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: Vent opening force stability, can By property, safety, the explosion rupture disk (2) is arranged to plane, double crimpings, round shape, kidney-shaped shape, fan shape or compound crimping, intermediate Band boss structure.

9. a kind of lithium ion battery sealing element according to claim 1, it is characterised in that: the nut cap is round or side Shape.