CN201796967U

CN201796967U - End cover set of lithium iron battery

Info

Publication number: CN201796967U
Application number: CN2010202972946U
Authority: CN
Inventors: 黄泓雯
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-19
Filing date: 2010-08-19
Publication date: 2011-04-13
Anticipated expiration: 2020-08-19

Abstract

The utility model provides an end cover set of a lithium iron battery. A closing plate of a shell of the battery is provided with a pressure-releasing piece which is provided with two opposite surfaces, a ring-shaped ditch needs to be arranged on at least one surface of the pressure-releasing piece, and the bearing pressure of the ring-shaped ditch is less than that of a battery tank body and that of the combination of the closing plate and the pressure-releasing piece, so that the ring-shaped ditch is firstly cracked to form a gas-releasing passageway when the pressure in the shell of the battery is raised to exceed a certain value. Therefore, in use of the end cover set, the overmuch gas accumulated in the lithium iron battery can be released at a proper time, and the lithium iron battery can be effectively prevented from being exploded so as to increase the using security of the lithium iron battery.

Description

The end cap group of lithium Fe battery

Technical field

The utility model is meant a kind of end cap group structure that is used for the lithium Fe battery of the vehicles especially relevant for lithium battery structure.

Background technology

Lithium Fe battery in the lithium battery is because of energy conversion efficiency height, long service life, stable high characteristic advantage, so be especially suitable for use as the electrokinetic cell of the vehicles; So, the vibrations of vehicles moving process are frequent, and it is abominable that the lithium Fe battery that the vehicles loaded stores environment, experience expose to the weather drench with rain, the chance of working temperature cataclysm and accident collision is very frequent, long-term use cannot say for sure down inside battery not can so the deterioration mutation, cause the lithium Fe battery internal pressure too high and cause explosion.Also therefore, the lithium Fe battery that the vehicles use is necessary in the design of its safety protection structure that SC notes.

For example, the high-effect startup battery that the tw Taiwan patent announcement is M374997 number, utilize a battery management system to connect plural batteries in parallel connection group, to detect each battery pack whether overdischarge arranged, overcharge, situation such as overheated, use and avoided discharging and recharging the hiding danger that causes cell internal pressure too high.And for example, the Vehicular battery device that the Taiwan patent announcement is M368966 number, it is similarly avoids the too high situation that has gathering gas to produce blast of cell internal pressure to take place, thereby the battery container of giving up traditional duricrust is packed, and use the external packing of the soft bag that is ductile instead as lithium Fe battery, use and overcome the unusual problem of cell internal pressure and produce.

But the former high-effect startup battery in case battery management system lost efficacy, still has the danger of lithium Fe battery explosion to exist.And the latter's Vehicular battery device, the pressure release ability of its bag is limit, and also can't very guarantee the security performance that it uses naturally.In view of this, the utility model proposes the end cap group improvement that another kind of lithium Fe battery uses, with effective aforesaid drawbacks of improving at the too high problem of above-mentioned lithium Fe battery internal pressure.

Summary of the invention

Main purpose of the present utility model provides a kind of end cap group of lithium Fe battery, and the explosion situation that it can very avoid lithium Fe battery to produce because of internal pressure is too high is to strengthen the safety in utilization of lithium Fe battery.

Another purpose of the present utility model is that a kind of end cap group of lithium Fe battery is being provided, and its pressure release part is simple in structure, cost of manufacture is low, the production efficiency height, and easy fast with the assembling of shrouding.

For achieving the above object, the utility model provides a kind of end cap group of lithium Fe battery, is located at a housing one end of a lithium Fe battery, and this end cap group comprises:

One shrouding has at least one perforation; And

One pressure release part is located in this perforation, and this pressure release part has relative two surfaces, at least onely should establish annular irrigation canals and ditches on the surface, and these annular irrigation canals and ditches break when pressure is greater than a preset value within this housing and form the passage that loses heart, in order to disengage pressure within this housing.

During enforcement, this pressure release part forms this annular irrigation canals and ditches with punch forming.

During enforcement, two of this pressure release part should the surface respectively be provided with one should the annular irrigation canals and ditches, and two should the annular irrigation canals and ditches and be in correspondence position.

During enforcement, these annular irrigation canals and ditches be shaped as circle or C shape, polygon or irregular annular.

During enforcement, this shrouding is located at this housing with laser welding or ultrasonic waves fusing mode.

During enforcement, more bore a hole between this pressure release part and this shrouding with fluid sealant or airtight being somebody's turn to do of seal ring.

During enforcement, this pressure release part inward at both ends depression forms a closing membrane in body portion, should the surface to form relative two up and down at this closing membrane.

During enforcement, this pressure release part is fixed in this perforation in the inlay card mode.

Compared with prior art, the end cap group of lithium Fe battery described in the utility model, this end cap group comprise a shrouding and at least one pressure release part.Wherein, shrouding is located at a housing one end of a lithium Fe battery, and has at least one perforation on the shrouding, for the pressure release part is set; The pressure release part has relative two surfaces, a surface is provided with annular irrigation canals and ditches to being less than wherein, this annular irrigation canals and ditches bearing capacity is less than the periphery surface bearing capacity, by this, when the housing internal pressure of lithium Fe battery exceeds a preset value, annular irrigation canals and ditches will take the lead in breaking, and will form a disappointing passage on the pressure release part, use the internal pressure that positively discharges gathering in the lithium Fe battery housing, effectively avoid housing to break because of high pressure.

Under promptly cooperate appended graphic explanation in detail by specific embodiment, when the effect that is easier to understand the purpose of this utility model, technology contents, characteristics and is reached.

Description of drawings

Fig. 1 is a lithium Fe battery structural representation that is provided with the utility model end cap group;

Fig. 2 is the exploded view of the utility model one embodiment;

Fig. 3 is the pressure release part cutaway view of the utility model one embodiment;

Fig. 4 is another enforcement aspect schematic diagram of the utility model pressure release part;

Fig. 5 is a pressure release part stress schematic diagram of the present utility model.

Description of reference numerals: 10-lithium Fe battery; The 12-positive electrode; The 14-negative electrode; The 16-housing; 20-end cap group; The 30-shrouding; The 32-perforate; The 34-perforation; 40-pressure release part; The 42-closing membrane; 421,422-surface; 44,44 '-annular irrigation canals and ditches; The 46-passage that loses heart.

Embodiment

Seeing also Fig. 1, is to show that one applies the lithium Fe battery structural representation of the utility model end cap group; This lithium Fe battery 10 has the housing 16 that positive and

negative electrode

12,14 and that an electric core (not shown), two draws from electric core coats this electric core, and housing 16 is to adopt hard metal to make, and causes lithium Fe battery 10 damages to avoid collision.

Cooperate shown in Figure 2ly, it is the end cap group exploded view of the utility model one embodiment.End cap group 20 has a shrouding 30 and a pressure release part 40, wherein, the material of shrouding 30 also is a hard metal, and be located at housing 16 1 ends with laser welding or ultrasonic waves fusing mode envelope, shrouding 30 corresponding positive and

negative electrodes

12,14 positions respectively have a perforate 32,32 ', so that the positive and negative electrode of lithium Fe battery 10 12,14 can by two perforates 32,32 ' reveal existing in outside, in the middle of this two perforate 32,32 ' and offer a perforation 34, for pressure release part 40 is set.Consulting Fig. 3 again, is the cutaway view of pressure release part.In present embodiment, pressure release part 40 is to make with aluminum metal, it generally is cylindricality, the perforation 34 of shrouding 30 can be passed by body portion, and pressure release part 40 two ends are slightly larger than this perforation 34 and driving fit and tight produce mutually with shrouding 30 sides, also can in pressure release part 40 and shrouding 30 smear fluid sealant, or add sealing ring for strengthening airtight effect this moment; Again, pressure release part 40 caves inward from its both ends of the surface, forms a closing membrane 42 in body portion, and closing membrane 42 has two surfaces 421,422 relatively, be provided with the annular irrigation canals and ditches 44 of a circle in a surface 422 wherein, these annular irrigation canals and ditches 44 formation place are the minimum place of closing membrane 42 bearing capacities naturally.

Wherein, annular irrigation canals and ditches 44 of the present utility model are except being the circle, but also C shape or polygon or irregularly shaped, shaped design needs according to the user and changes, and in the previous embodiment, for accelerating lithium Fe battery 10 assembling speeds, therefore adopt aluminum metal pressure release part 40 to be fixed on the shrouding 30, and form closing membrane 42 and annular irrigation canals and ditches 44 simultaneously in the punch forming mode.

On the practice, the set-up mode of the form of pressure release part 40 and annular irrigation canals and ditches 44 all can be made change according to need by the designer.For example, another enforcement aspect schematic diagram of Fig. 4 the utility model pressure release part is shown, wherein, pressure release part 40 is to be made with plastic rubber ejaculate molding, it is directly to buckle in the perforation 34 of shrouding 30 in the inlay card mode, and should implement in the aspect, annular irrigation canals and ditches 44,44 ' are present in the relative position on two surfaces 421,422 simultaneously.Foot shows that pressure release part 40 can have the multiple different aspect of implementing according to user's demand, and the pressure release part is provided with quantity and also all can optionally takes suitable selection certainly.

As shown in Figure 5, because when lithium Fe battery 10 internal pressures are assembled, internal pressure will continue to push shrouding 30 and pressure release part 40, in case internal pressure surpasses a predetermined value, what stand in the breach will be annular irrigation canals and ditches 44 places places, and it is because of than the thinner relation of thickness on every side, and down generation be broken can't bear to push, also therefore form a disappointing passage 46 on closing membrane 42, the internal pressures of assembling in the housing 16 will be overflowed the external world along disappointing passage 46.Thus, can guarantee that the housing 16 of lithium Fe battery 10 does not have the danger of explosion immediately.

In sum, the end cap group that the utility model proposes lithium Fe battery can very be guaranteed the fail safe that lithium Fe battery uses, avoid lithium Fe battery that explosion danger is arranged, and then reach the effect person of high security, and the utility model also has the advantage that member is simple, assembling is quick, with low cost.

Above-described embodiment only is explanation technological thought of the present utility model and characteristics, its purpose makes the personage who has the knack of this skill can understand content of the present utility model and is implementing according to this, when can not with qualification claim of the present utility model, promptly the equalization of doing according to the spirit that the utility model disclosed generally changes or modifies, and must be encompassed in the claim of the present utility model.

Claims

1. the end cap group of a lithium Fe battery is located at a housing one end of a lithium Fe battery, it is characterized in that this end cap group comprises:

One shrouding has at least one perforation; And

2. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, this pressure release part forms this annular irrigation canals and ditches with punch forming.

3. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, two of this pressure release part should the surface respectively be provided with one should the annular irrigation canals and ditches, and two should the annular irrigation canals and ditches and be in correspondence position.

4. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, these annular irrigation canals and ditches be shaped as circle or C shape, polygon or irregular annular.

5. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, this shrouding is located at this housing with laser welding or ultrasonic waves fusing mode.

6. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, more bores a hole with fluid sealant or airtight being somebody's turn to do of seal ring between this pressure release part and this shrouding.

7. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, this pressure release part inward at both ends depression forms a closing membrane in body portion, should the surface to form relative two up and down at this closing membrane.

8. the end cap group of lithium Fe battery as claimed in claim 1 is characterized in that, this pressure release part is fixed in this perforation in the inlay card mode.