CN203119015U

CN203119015U - Anti-explosion structure for lithium battery box

Info

Publication number: CN203119015U
Application number: CN2013200138135U
Authority: CN
Inventors: 黄文弘
Original assignee: Dongguan Qiao Steps On Energy-Conservation Science And Technology Ltd
Current assignee: Dongguan Qiao Steps On Energy-Conservation Science And Technology Ltd
Priority date: 2013-01-10
Filing date: 2013-01-10
Publication date: 2013-08-07
Anticipated expiration: 2023-01-10

Abstract

The utility model discloses an anti-explosion structure for a lithium battery box. The anti-explosion structure comprises a top plate, wherein a groove stretching towards the direction of top surface of the top plate is formed in the bottom surface of the top plate so as to form a thin plate on the top plate, and a plurality of thin crevices stretching towards the direction of the top surface are formed in the thin plate so as to form a plurality of sheets. Therefore, when the bottom surface of the top plate is combined to the top end of a shell and the gas pressure in the shell reaches a preset pressure due to the expansion, the sheets can be fractured, and the thin plate can be bent, so that expansion gas in the shell leaks outwards, and the use safety is guaranteed.

Description

The lithium battery kit blast resistance construction

Technical field

The utility model relates to a kind of lithium battery kit blast resistance construction, refers to that especially a kind of expanding gas pressure that can be in housing when arriving preset pressure, effectively carries out pressure release, guarantees user's safety.

Background technology

Lithium battery battery box mainly is to comprise a housing at present, built-in positive plate, barrier film and the negative plate that is placed with electrolyte solution and adopts lamination or coiling assembling mode to assemble of housing.Wherein, each positive plate with after the positive pole ear welding, is welded on the bottom of the positive terminal of housing respectively more simultaneously, and each negative plate is welded on the bottom of the negative terminal of housing more simultaneously respectively with the negative lug welding.The top of positive terminal and negative terminal then is to be respectively equipped with external screw thread, uses after screwing togather a nut respectively, fixes different binding posts respectively, with the outside output power of difference.

Wherein, when lithium battery during at the charge and discharge state, allow the electrolyte solution temperature in the housing rise easily, and produce gas.And in order to prevent because of the gas rapid expanding, to make hypertonia and allow case fragmentation, therefore, can iron the last layer rupture pressure disc mostly on the top board of lithium battery housing top at present, with the sealing explosionproof hole, use when the gas rapid expanding, break through the obstruct of rupture pressure disc, to reach the purpose of pressure release.

But when reality is used, producer and can't accurately predict the pressure that rupture pressure disc pops, therefore, when the not too high and rupture pressure disc of the gas pressure in the housing popped, lithium battery namely can't re-use; And when the too high and rupture pressure disc of the gas pressure in the housing does not pop, then have the danger of case fragmentation.

The patent No. is the blast resistance construction that 201220109453.4 Chinese patent discloses a kind of lithium battery, the cover plate of lithium battery is provided with explosionproof hole, be provided with burst disk in the explosionproof hole, the edge of burst disk is fixing on the cover board, and the part that burst disk is positioned at explosionproof hole is recessed to form the inner concave shape structure to lithium battery interior.The blasting impact power of this utility model is very little, and destructive power is little, can improve the security performance of lithium battery greatly.But the mode that this patent is dealt with problems is not thorough, still needs further improvement.

In view of this, in order to improve above-mentioned shortcoming, when making expanding gas pressure that the lithium battery kit blast resistance construction can be in housing arrive preset pressure, reach the pressure release purpose, to avoid the product waste, and guarantee to use safety, long-pending experience and the constantly research and development improvement for many years of creator has the utility model to produce then.

The utility model content

The purpose of this utility model is to provide a kind of lithium battery kit blast resistance construction, structure by a direct groove of machine-shaping and several finedraws on top board, the utility model is simple in structure, prevent that rupture pressure disc from popping in advance, cause the waste of product, and the gas pressure in housing rises and when reaching predetermined pressure, effectively pressure release is to guarantee to use safety.

For achieving the above object, the technical scheme that provides of the utility model is as follows:

A kind of lithium battery kit blast resistance construction comprises a top board, and top board is incorporated into the top of housing, and top board comprises end face and is in reverse to the bottom surface of end face.The bottom surface of top board is provided with the groove that extends towards the end face direction, use at top board and form thin plate, and thin plate is provided with the finedraw that several extend towards the end face direction, use at top board and form several thin slices, when using gas pressure in housing and reaching default pressure, allow sheet tears, thereby the expanding gas in the housing is outwards released.

During enforcement, thin plate is rounded, and several finedraws on the thin plate are cross-shaped.

During enforcement, the finedraw on the above-mentioned thin plate is preferable to be provided with two, and two finedraws are cross.

The utlity model has following advantage:

1, the utility model can rise by the gas pressure in housing, and when reaching default force value, expanding gas in the housing is upwards released fast by the gap between the thin slice that breaks and each gusset, therefore, not only can effectively avoid described lithium battery kit blast resistance construction because of the rupture pressure disc institute's product that the causes waste that pops in advance, and can effectively avoid making the danger of case fragmentation because the gas pressure in the housing continue to rise, to guarantee to use safety.

2, the utility model can add man-hour, via the thickness of control thin slice with the pressure of accurate setting thin slice explosion, therefore, can flexible application on the product of various type bodies and various different size dimension rules.

3, the utility model direct machine-shaping person on top board, therefore simple in structure and be easy to make, can effectively reduce production costs.

Description of drawings

Fig. 1 is the three-dimensional appearance schematic diagram for the preferred embodiment of lithium battery kit blast resistance construction described in the utility model;

Fig. 2 is the front schematic view during for the preferred embodiment of lithium battery kit blast resistance construction described in the utility model and shell combination;

Fig. 3 is the part section enlarged drawing for a part among Fig. 2;

Fig. 4 is the use state diagram for the preferred embodiment of lithium battery kit blast resistance construction described in the utility model.

The main element symbol description

Lithium battery kit blast resistance construction 1

Top board 2

End face 21

Bottom surface 22

Positive terminal 23

Negative terminal 24

Groove 25

Thin plate 26

Finedraw 27

Thin slice 28

Gusset 29

Housing 9

Spatial accommodation 91

Embodiment

Be further described below in conjunction with accompanying drawing and the preferred embodiment technical scheme with regard to the utility model lithium battery kit blast resistance construction.

As Fig. 1, Fig. 2, shown in Figure 3, be the preferred embodiment of lithium battery kit blast resistance construction 1 described in the utility model, be for the top that is incorporated into a housing 9.

Lithium battery kit blast resistance construction 1 described in the utility model comprises a rectangle top board 2, top board 2 comprises end face 21 and is in reverse to the bottom surface 22 of end face 21, and the bottom surface of top board 2 is incorporated into the top of rectangle housing 9, use the spatial accommodation 91 that forms a sealing in the inside of housing 9, to put electrolyte solution, positive plate, barrier film and negative plate.The both sides of top board 2 are respectively in conjunction with positive terminal 23 and negative terminal 24, the bottom electrical of positive terminal 23 connects positive plate, the bottom electrical of negative terminal 24 connects negative plate, outwards to export positive and negative via positive terminal 23 and negative terminal 24 respectively.

In the present embodiment, the middle position of the bottom surface 22 of top board 2 is provided with a circular groove 25 that extends towards end face 21 directions, via forming circular groove 25, forms circular sheet 26 at top board 2, and during enforcement, groove 25 and thin plate 26 also can be polygon-shaped.In addition, the bottom surface of thin plate 25 is provided with two intersections and is criss-cross finedraw 27, article two, finedraw 27 is to extend towards the direction of the end face 21 of top board 2, and form via two finedraws 27, namely can form two at top board 2 and be the part that 28, two thin slices 28 of criss-cross thin slice are actually top board 2.And because two finedraw 27 cuttings then can form four blocks of gussets 29 with wedge angle at thin plate 25.During enforcement, the finedraw 27 on the thin plate 25 also can be made as more than three or three, and each bar finedraw 27 intersects mutually, can form several piece gussets 29 at thin plate 25 equally.

As shown in Figure 4, electrolyte solution temperature in the spatial accommodation 91 of housing 9 rises and produces a large amount of gases, and when the pressure that gas expands reaches default force value, pressure via the gas expansion, cross thin slice 28 on the top board 2 is broken, and gusset 29 is upwards raised, thus, expanding gas in the housing 9 namely can upwards be released fast by the gap between each gusset 29, explodes because gas pressure is excessive to avoid housing 9.

In sum, according to the content that above discloses, the utility model really reaches the intended purposes of utility model, provide a kind of simple in structure, be easy to processing to reduce production costs; When gas pressure that can be in housing arrives preset pressure, allow the expanding gas pressure release, to avoid the waste of product; And can prevent effectively that housing from exploding because internal pressure is too high, to guarantee using safe lithium battery kit blast resistance construction, have practical value.

The above is specific embodiment of the utility model and the technological means used, can derive according to the exposure of this paper or instruction and to derive many changes and correction, if the equivalence of doing according to conception of the present utility model changes, when the effect that produces does not exceed specification and the graphic connotation of containing yet, all should be considered as within technology category of the present utility model.

Claims

1. lithium battery kit blast resistance construction, comprise top board, it is characterized in that: described top board is incorporated into the top of a housing, top board comprises an end face and is in reverse to a bottom surface of end face, the bottom surface of top board is provided with a groove that extends towards the end face direction, use at top board and form a thin plate, thin plate is provided with several towards the finedraw that the end face direction is extended, and uses at top board and forms several thin slices.

2. lithium battery kit blast resistance construction according to claim 1, it is characterized in that: described thin plate is rounded.

3. lithium battery kit blast resistance construction according to claim 1 and 2, it is characterized in that: several finedraws on the described thin plate are cross-shaped.

4. lithium battery kit blast resistance construction according to claim 3, it is characterized in that: the finedraw on the described thin plate is provided with two, and two finedraws are cross.