CN201340866Y

CN201340866Y - Lithium ion battery anti-exploding valve

Info

Publication number: CN201340866Y
Application number: CNU2008201699780U
Authority: CN
Inventors: 黄德欢; 曹正明; 张拥乱; 王国光
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-15
Filing date: 2008-12-15
Publication date: 2009-11-04
Anticipated expiration: 2018-12-15

Abstract

The utility model relates to a lithium ion battery anti-exploding valve, comprising a valve body with an outward protruding chuck, a claw-shaped valve cover, a conical valve core with a stepped surface and a spring, wherein two blocking bayonets are arranged on a claw arm of the valve cover; the valve body and the valve cover are fastened in an meshing way by the blocking bayonets; the valve core and the spring are arranged inside a valve body cavity on the axial line; a centre hole is arranged at the bottom of the valve body; a boss which has the same axial line with the valve body is arranged inside the valve cover; two ends of the spring are respectively sleeved on the boss of the valve cover and a boss arranged above the stepped surface of the valve core; a conical end of the valve core presses towards the centre hole; and an air hole is arranged on the wall of the valve body. The deformation of the spring is changed by adjusting the positions of the blocking bayonets, thereby setting and controlling the operating pressure for the opening and closing of the valve core. When the internal atmospheric pressure of the battery reaches the operating pressure, the valve core is automatically opened for reliving the atmospheric pressure, thus effectively preventing a shell of the lithium ion battery from exploding; and when the internal atmospheric pressure of the battery is decreased, the valve core can be automatically replaced, and the battery works normally again. The anti-exploding valve has sensitive action and good reliability.

Description

A kind of lithium ion battery explosion-proof valve

Technical field

The utility model relates to a kind of lithium ion battery explosion-proof valve, particularly relates to a kind of explosion-proof valve that is used on the last lithium-ion battery shell that uses such as electric bicycle, battery-operated motor cycle, electric automobile, mine lamp and defence equipment.

Background technology

The secondary energy sources lithium ion battery that integrates big capacity, high stability, light, environmental protection is not only being played the part of extremely important role in today that crisis constantly appears in world energy sources, and can satisfied the demand of the modern environmental protection life of people.Lithium ion battery has constantly obtained application at key areas such as electric bicycle, battery-operated motor cycle, electric automobile, mine lamp and defence equipments.But lithium ion battery in use when abnormal conditions such as short circuit occurring, overcharge, crossing putting, can cause electric current out of control, and internal temperature sharply rises; When temperature rose to more than 75 ℃, the material of inside battery as electrolyte, can sharply decompose and generation gas, causes inside battery air pressure to raise, and the housing dilatancy can be exploded when serious.Therefore, the metal shell lithium ion battery all is equipped with different safety anti-explosive devices, to prevent the rising of inner pressure of battery.At present, safety device commonly used mainly contains following two kinds of forms on the lithium ion battery.

A kind of is the indentation that processing has certain depth on the metal shell surface of battery.When inner pressure of battery was elevated to a certain degree, indentation went out the step-down of can breaking automatically, to prevent that battery is because of the explosion of interior voltage rise height.This indentation explosion-protection equipment is difficult to accurate control because of its degree of depth, and the stress consistency at indentation position is relatively poor, is difficult to guarantee its reliable action.

Another kind is processing one deck rupture pressure disc on the explosionproof hole of battery metal housing cover.This diaphragm type safety device can break when inner pressure of battery raises automatically, reaches the purpose that prevents the battery explosion.But the processing rupture pressure disc not only requires height to production equipment on the cover plate explosionproof hole, and because the processing technology complexity, and increase cost.In addition, rupture pressure disc also can't guarantee constant fracture pressure.

These two kinds of lithium ion battery safety devices all can not recover after indentation or rupture pressure disc break again, entire cell was lost efficacy and scrap.

Summary of the invention

The purpose of this utility model is that design a kind ofly is active in one's movements, the inner pressure of battery thresholding can accurately be set two grades lithium ion battery explosion-proof valve.

Lithium ion battery of the present utility model comprises valve body with explosion-proof valve, valve gap, coniform spool and spring with step surface, the outer wall of valve body is provided with the evagination dop, valve gap is claw type, the inwall of pawl has two grades of bayonet sockets that are complementary with the valve body dop vertically, valve body and valve gap are fastening by the interlock that interlocks of dop and bayonet socket, spool and spring are in the valve body chamber, be positioned on the axis of valve body, the bottom of valve body has centre bore, there is the boss with the valve body coaxial line inboard of valve gap, the two ends of spring are enclosed within respectively on the boss and the boss above the spool step surface of valve gap, and the cone-shaped end of spool is pressed to centre bore, has pore on valve body wall.

The utlity model has following advantage:

Lithium ion battery of the present utility model with explosion-proof valve by the fastening two grades of deformation quantities that come regulating spring of valve body and valve gap dop and bayonet socket interlock, can accurately set two grades of inner pressure of battery thresholdings, wherein one grade of less interior pressure thresholding of spring deformation amount is used for remaining silent of battery and changes into, the interior pressure thresholding that another grade spring deformation amount is bigger is used to set the explosion-proof pressure point of battery, when inside battery air pressure reaches operating pressure, spool is opened automatically, alleviate air pressure, can avoid the housing explosion of lithium ion battery effectively, after reducing, inner pressure of battery can recover the normal operating conditions of battery from horizontal reset.This safety valve is active in one's movements, good reliability, can be widely used on the lithium-ion battery shell of uses such as electric bicycle, battery-operated motor cycle, electric automobile, mine lamp and defence equipment.

Description of drawings

Fig. 1 is a lithium ion battery of the present utility model explosion-proof valve structural representation;

Fig. 2 is the valve gap schematic diagram;

Fig. 3 is the A-A profile of Fig. 2;

Fig. 4 is the valve body schematic diagram;

Fig. 5 is the cover plate schematic diagram of battery container.

Embodiment

With reference to Fig. 1, lithium ion battery of the present utility model comprises valve body 6 with explosion-proof valve, valve gap 3, coniform spool 5 and spring 4 with step surface, the outer wall of valve body 6 is provided with evagination dop 20 (see figure 4)s, valve gap 3 is hexa-claw shape, the inwall of pawl has two grades of bayonet sockets 18 that are complementary with the valve body dop vertically, 19 (see Fig. 2, Fig. 3), grooving 23 width are greater than the width of valve body dop 20 on the valve gap, valve body and valve gap are fastening by dop 20 and bayonet socket 18 or bayonet socket 19 interlocks, desire with valve gap when valve body takes off, only need valve gap is rotated a certain angle, make grooving 23 and valve body upper chuck 20 overlapping getting final product on the valve gap.Spool 5 and spring 4 are in valve body 6 chambeies, be positioned on the axis of valve body, the bottom of valve body 6 has centre bore 10, there is the boss 13 with valve body 6 coaxial lines the inboard of valve gap 3, and the two ends of spring 4 are enclosed within respectively on the boss 13 and the boss 14 above the spool step surface of valve gap, and the cone-shaped end of spool 5 is pressed to centre bore 10, usually, make the lower cavity of valve body be coniform, so that under the spring force effect, the cone-shaped end of spool stretches in the centre bore of valve body.On valve body 6 walls, have pore 7.

Explosion-proof valve of the present utility model is fastened on the cover plate 1 of lithium-ion battery shell shown in Figure 5, and the centre bore 10 of valve body and the battery liquid-filling mouth on the cover plate 12 are merged.For guaranteeing explosion-proof valve and battery container sealing effectiveness, annular nib 9 (see figure 1)s can be set in the bottom surface of valve body, utilize annular nib that explosion-proof valve and battery container are welded together.16 is battery pole ears among Fig. 2.Before the battery liquid-filling, take off valve gap, spring and spool, spool, spring and valve gap are installed after the fluid injection again.When battery changes into, with valve body dop 20 and 19 both interlocks of valve gap bayonet socket, obtain the pressure point that battery is remained silent and set when changing into, can guarantee that battery is remained silent changes into, prevent that gas from entering, solved the problem that steel ball jumps out easily of sealing of conventional batteries liquid injection hole simultaneously effectively under the inner pressure of battery effect.During the battery operate as normal, with valve body dop 20 and 18 both interlocks of valve gap bayonet socket, the pressure point of setting when obtaining the battery operate as normal, when the battery container air pressure inside reaches setting air pressure numerical value, spool can be opened under interior pressure effect automatically, air pressure in the battery container is alleviated, and from pore, discharged, play the safeguard protection effect; After inside battery air pressure reduced, spool automatically reset and closes, the battery recovery normal operating conditions.

Regulate the bayonet socket position of valve gap, the decrement of adjustable springs, to set and to control the pressure spot of explosion-proof valve spool opening and closing, can also be easily at preliminary filling with change into the stage, and adjust and set during the different safe pressure point of different capabilities battery request, and it is constant to guarantee to set atmospheric pressure value.Therefore, explosion-proof valve can be adjusted in battery manufacturing and use and set different explosion-proof pressure point, guarantees the production of battery and safe in utilization, prevents that battery from blasting.

Claims

1. lithium ion battery explosion-proof valve, it is characterized in that comprising valve body (6), valve gap (3), coniform spool (5) and spring (4) with step surface, the outer wall of valve body (6) is provided with evagination dop (20), valve gap (3) is claw type, the inwall of pawl has two grades of bayonet sockets (18 that are complementary with valve body (6) dop (20) vertically, 19), valve body and valve gap are fastening by the interlock that interlocks of dop and bayonet socket, spool (5) and spring (4) are in valve body (6) chamber, be positioned on the axis of valve body, the bottom of valve body (6) has centre bore (10), there is the boss (13) with valve body (6) coaxial line the inboard of valve gap (3), the two ends of spring (4) are enclosed within respectively on the boss (13) and the boss (14) above the spool step surface of valve gap, the cone-shaped end of spool (5) is pressed to centre bore (10), has pore (7) on valve body (6) wall.

2. lithium ion battery explosion-proof valve according to claim 1 is characterized in that the lower cavity of valve body (6) is coniform.

3. lithium ion battery explosion-proof valve according to claim 1 is characterized in that the bottom surface of valve body (6) has the annular nib (9) of welding usefulness.