CN207690886U - Secondary cell head cover explosion-proof valve, cap assembly, secondary cell and automobile - Google Patents

Abstract

This application involves secondary cell head cover explosion-proof valve, cap assembly, secondary cell and automobiles.Explosion-proof valve includes flat base portion and relative to the outwardly projecting protrusion of flat base portion, and protrusion is provided with indentation anyhow and is connected to branch's indentation of indentation one end anyhow, and indentation and branch's indentation are in non-zero angle anyhow.The explosion-proof valve includes the outside protrusion outstanding relative to flat base portion to cap assembly, it is provided with indentation anyhow on the protrusion and connects branch's indentation of the indentation anyhow, when the pressure of enclosure interior excessively increases, gas generates stress concentration at protrusion and tears explosion-proof valve at indentation anyhow and branch's indentation, so that the gas in shell is released, the risk that secondary cell explodes is thus reduced, the safety of secondary cell is improved.

Description

Secondary cell head cover explosion-proof valve, cap assembly, secondary cell and automobile

Technical field

This application involves energy storage device technical field more particularly to a kind of secondary cell head cover explosion-proof valve, cap assembly, Secondary cell and automobile.

Background technology

Secondary cell can be charged and discharged, if secondary cell is in following situation, such as overcharges, is golden When belonging to conductor puncture pole piece and hot tank test, then the inside of secondary cell can quickly gather heat and gas, thereby result in The internal pressure of secondary cell increases, and the expansion and explosion of secondary cell are caused when serious.

Secondary cell is usually provided with explosion-proof valve, when the internal pressure of secondary cell increases to the Opening pressure of explosion-proof valve When, internal gas is discharged from explosion-proof valve, to avoid secondary cell that the perils such as explosion occur.

Utility model content

This application provides a kind of secondary cell head cover explosion-proof valve, cap assembly, secondary cell and automobiles, it is intended to improve The safety of secondary cell.

This application provides a kind of secondary cell head cover explosion-proof valve, the explosion-proof valve includes flat base portion and relative to described The flat outwardly projecting protrusion of base portion, the protrusion are provided with indentation anyhow and are connected to the branch of described indentation one end anyhow Indentation, the indentation anyhow are in non-zero angle with branch's indentation.

Optionally, the protrusion has ridge shape wedge angle, the inner surface opposite with the protrusion of the explosion-proof valve With recessed portion corresponding with the dome shape.

Optionally, the indentation anyhow may be contained within the top of the ridge shape wedge angle with branch's indentation, and/or

Anyhow the indentation and branch's indentation may be contained within the corresponding with the ridge shape wedge angle of the recessed portion Bottom.

Optionally, branch's indentation is two, and the indentation anyhow and described two branch's indentations are Y-shaped.

Optionally, described two branch's indentations are symmetrical relative to the indentation anyhow, and the both ends of the indentation anyhow connect It is connected to described two branch's indentations.

Optionally, the angle between branch's indentation and the indentation anyhow is 120 °~150 °.

Optionally, the length of the indentation anyhow is 1.5 times~2.5 times of length of branch's indentation.

Optionally, the explosion-proof valve further includes transition part, and the protrusion connects via the transition part and the flat base portion It connects, the relatively described flat base portion of the transition part is obliquely installed.

Optionally, the angle of inclination of the transition part is 2 °~15 °.

Present invention also provides a kind of secondary cell cap assembly, including coping plate and it is connected to the explosion-proof of the coping plate Valve, the explosion-proof valve are explosion-proof valve described in any one of the above embodiments.

Present invention also provides a kind of secondary cells, including：

Electrode assembly；

Shell has opening；

And secondary cell cap assembly described above,

Wherein, the secondary cell cap assembly is connected to the opening of the shell and forms encapsulated space, the electricity In the encapsulated space, the protrusion protrudes pole component package towards the direction far from the electrode assembly.

Present invention also provides a kind of automobiles, including secondary cell described above.

Technical solution provided by the present application can reach following advantageous effect：

This application provides a kind of secondary cell cap assembly explosion-proof valve, which includes outside relative to flat base portion Protrusion outstanding is provided with indentation anyhow on the protrusion and connects branch's indentation of the indentation anyhow, when enclosure interior When pressure excessively increases, gas generates stress concentration at protrusion and tears explosion-proof valve at indentation anyhow and branch's indentation It splits so that the gas in shell is released, and is thus reduced the risk that secondary cell explodes, is improved the peace of secondary cell Quan Xing.

It should be understood that above general description and following detailed description is merely exemplary, this can not be limited Application.

Description of the drawings

Fig. 1 is the decomposition view of secondary cell provided by the embodiments of the present application；

Fig. 2 is the vertical view of secondary cell cap assembly provided by the embodiments of the present application；

Fig. 3 is the decomposition view of secondary cell cap assembly provided by the embodiments of the present application；

Fig. 4 is the schematic diagram of the explosion-proof valve of secondary cell cap assembly provided by the embodiments of the present application；

Fig. 5 is the sectional view of the part-structure of explosion-proof valve provided by the embodiments of the present application；

Fig. 6 is the sectional view of the part-structure for the explosion-proof valve that another embodiment of the application provides.

Reference numeral：

1000- secondary cells；

100- shells；

200- cap assemblies；

202- coping plates；

202a- ventings；

204- first end daughter boards；

206- second end daughter boards；

208- explosion-proof valves；

2082- edge joins；

2084- central discharge airs portion；

The flat base portions of 20842-；

20844- protrusions；

20844a- indentations anyhow；

20844b- branches indentation；

20846- transition parts；

300- electrode assemblies；

The first lugs of 302-；

The second lugs of 304-；

400- insulating films；

The first collectors of 500-；

502- the first lug interconnecting pieces；

The second collectors of 600-；

602- the second lug interconnecting pieces.

The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application Example, and the principle together with specification for explaining the application.

Specific implementation mode

It is described in further detail below by specific embodiment and in conjunction with attached drawing to the application.

It should be noted that the nouns of locality such as "upper", "lower", "left", "right" described in the embodiment of the present application are with attached drawing Shown in angle come what is be described, should not be construed as the restriction to the embodiment of the present application.In addition, within a context, it is also necessary to Understand, when mentioning an element and being connected to another element "upper" or "lower", can not only be connected directly between another One element "upper" either "lower" can also be indirectly coupled to by intermediary element another element "upper" or " under.

Referring to FIG. 1, Fig. 1 shows the decomposition view of secondary cell.

Secondary cell 1000 includes shell 100, secondary cell cap assembly 200 (hereinafter referred to as cap assembly), electrode group Part 300 and insulating film 400.Wherein, electrode assembly 300 and insulating film 400 are accommodated in shell 100,300 quilt of electrode assembly Insulating film 400 wraps up, and the opening of shell 100 can be sealed by cap assembly 200, the contact site of cap assembly 200 and shell 100 Dividing can be connected to each other for example, by welding.

Electrode assembly 300 is made by way of winding or laminating comprising the first pole piece, the second pole piece and for every The partition board of the first pole piece and the second pole piece is opened, here, the first pole piece may be used as negative plate, and the second pole piece may be used as anode Piece, vice versa.

First pole piece and the second pole piece include the coating coated portion of active material and being not coated with for uncoated active material Part is covered, since the material of the active material coated by the first pole piece and the second pole piece is different so that the first pole piece and the second pole Piece can have polarity different from each other.

For example, the first pole piece is positive plate, the active material coated by positive plate can be LiFePO4, cobalt acid lithium and manganese Sour lithium etc., the second pole piece are negative plate, and the active material coated by negative plate can be carbon or silicon.The uncoated portion of first pole piece Divide and form the first lug 302, the uncoated part of the second pole piece forms the second lug 304.

Secondary cell further includes the first collector 500 and the second collector 600, the first pole piece of electrode assembly 300 and Two pole pieces can be respectively connected to the first collector 500 and the second collector 600.First collector 500 is conductive material, It is connect with the first lug 302 positioned at one end of electrode assembly 300, to be connect with the first pole piece.

First collector 500 includes first terminal interconnecting piece and the first pole piece interconnecting piece 502, the first pole piece interconnecting piece 502 It is connect with the first lug 302, first terminal interconnecting piece and the first electrode terminal of cap assembly 200 are (attached to be not shown in figure) even It connects.Connecting hole is provided on first terminal interconnecting piece, first electrode terminal matches setting with connecting hole, so as to by first electrode end Son is contained in connecting hole, and first electrode terminal and first terminal interconnecting piece can be connected to each other for example, by welding.

Second collector 600 is made of an electrically conducting material, with the second lug 304 company positioned at one end of electrode assembly 300 It connects, to be connect with the second pole piece.

Second collector 600 includes Second terminal interconnecting piece and the second pole piece interconnecting piece 602, the second pole piece interconnecting piece 602 It is connect with the second lug 304, Second terminal interconnecting piece and the second electrode terminal of cap assembly 200 are (attached to be not shown in figure) even It connects.Connecting hole is provided on Second terminal interconnecting piece, second electrode terminal matches setting with connecting hole, so as to by second electrode end Son is contained in connecting hole, and second electrode terminal and Second terminal interconnecting piece can be connected to each other for example, by welding.

It should be noted that Fig. 1 though it is shown that the first lug 302 and the second lug 304 from the side of electrode assembly 300 The case where stretching, still, the structure of electrode assembly 300, are not limited only to this.

Referring to FIG. 2, Fig. 2 shows the vertical views of cap assembly.

Cap assembly 200 includes coping plate 202, first electrode terminal and second electrode terminal (attached to be not shown in figure). Terminal hole (attached to be not shown in figure) is offered on coping plate 202, to allow first electrode terminal and second electrode terminal to overhanging Go out.Illustratively, the part of first electrode terminal stretching coping plate 202 is connect with first end daughter board 204, and then and external conductive Terminal connects.

Similar structure can also be applied to second electrode terminal, that is, second electrode terminal stretches out the part of coping plate 202 It is connect with second end daughter board 206.

Cap assembly 200 further includes explosion-proof valve 208, and explosion-proof valve 208 is connect with coping plate 202, and is connected to coping plate 202 About central part.

Referring to FIG. 3, Fig. 3 shows the decomposition view of cap assembly.

Coping plate 202 offers venting 202a, and explosion-proof valve 208 seals venting 202a, illustratively, venting 202a is set to oblong openings, and the shape and the shape of venting 202a of explosion-proof valve 208 match, and explosion-proof valve 208 includes Edge joins 2082 and central discharge air portion 2084, wherein the edge joins 2082 are tightly connected with coping plate 202, and even It is connected to the circumference of venting 202a, central discharge air portion 2084 is then discharged after tearing for the gas in shell 100.

In a kind of exemplary embodiment, the thickness of edge joins 2082 can be more than the thickness in central discharge air portion 2084 Degree, to form relatively reliable connection between edge joins 2082 and coping plate 202, edge joins 2082 are connected to top Welding, such as laser welding may be used in the inner surface of cover plate 202, connection type.

Referring to FIG. 4, Fig. 4 shows the vertical view of explosion-proof valve.

Central discharge air portion 2084 is including flat base portion 20842 and relative to 20842 outwardly projecting protrusion of flat base portion 20844.Wherein, flat base portion 20842 has flat surfaces, and protrusion 20844 is then from flat base portion 20842 to far from electrode assembly 300 side protuberance (being swelled to the outside of cap assembly 200), to form prominent structure.

Be provided on protrusion 20844 linear type the 20844a of indentation anyhow and with this anyhow indentation 20844a end connect The branch indentation 20844b connect, indentation 20844a is along the length direction extension of oblong explosion-proof valve 208, branch's indentation anyhow 20844b and indentation 20844a anyhow institutes are angled to be not zero.When having the internal pressure more than preset pressure in shell 100 (such as due to overcharging and when excessive aerogenesis), at this point, anyhow at indentation 20844a and branch indentation 20844b than shell 100 its It can quickly be opened at its position, to form the tearing port of supplied gas ejection.The tearing port can be in quick release shell 100 Gas thus reduce the risk exploded of secondary cell to alleviate the internal pressure of shell 100.

Referring to FIG. 5, Fig. 5 shows the sectional view of explosion-proof valve.

Protrusion 20844 is swelled towards the side far from 100 inner space of shell, and is in ridge shape.Anyhow indentation 20844a The top of ridge shape wedge angle is arranged at branch indentation 20844b.It is corresponding in inner surface after being swelled due to protrusion 20844 Position formed recessed portion, when, there are when enough internal pressures, the internal pressure of shell 100 can concentrate work in shell 100 In recessed portion, that is, the top of ridge shape wedge angle, at this moment, be arranged the top of protrusion 20844 the 20844a of indentation anyhow and Branch indentation 20844b can be quickly torn under the effect of preset pressure, with what is excessively increased in transient response shell 100 Gas pressure.

It is selectable, referring to FIG. 6, indentation 20844a and branch indentation 20844b can also be arranged in protrusion anyhow 20844 towards electrode assembly 300 inner surface, that is, the bottom of recessed portion, likewise, in the effect of 100 internal pressure of shell Under, gas gathers in recessed portion, and forms stress concentration at indentation 20844a anyhow and branch indentation 20844b, and gas exists It is quickly sprayed after tearing indentation 20844a and branch indentation 20844b anyhow.

It is known that 20844 relatively flat base portion 20842 of protrusion swells outward, rather than it is empty towards the inside of shell 100 Between be bent, this setting be exactly in order to avoid central discharge air portion 2084 under the action of internal pressure repeatedly expansion occur fatigue break The defect split, and can prevent 280 Opening pressure of explosion-proof valve from reducing.

With continued reference to FIG. 4, in order to increase the tearing port being formed at indentation 20844a anyhow and branch indentation 20844b Area, in the same end of indentation 20844a anyhow, branch indentation 20844b could be provided as two, in this way, Liang Tiao branches carve Trace 20844b with one anyhow indentation 20844a can form the indentation of approximate Y shape, Y shape indentation can increase opening after tearing Area, and then increase flow when gas discharge.

Further, in order to make explosion-proof valve 208 quickly be opened, the both ends of indentation 20844a can also be arranged respectively to anyhow Y shape indentation, that is, the both ends of indentation 20844a are respectively connected with Liang Tiao branches indentation 20844b anyhow, after being arranged in this way, indentation anyhow The both ends of 20844a form two intersection points with Liang Ge branches indentation 20844b respectively, and central discharge air portion 2084 can be from two intersection points Place is torn first, and quickly forms a connection and the tearing port through flat base portion 20842, at this point, the tearing port allows gas Body is with the pressure in the capacity release shell 100 of bigger.

The Liang Ge branches indentation 20844b being arranged in the same ends indentation 20844a anyhow can be about indentation 20844a anyhow The straight line at place is symmetrical arranged, so, the equal length of each branch's indentation 20844b, and between indentation 20844a anyhow Angle it is equal.Under the action of the internal pressure of shell 100, the friendship of Liang Ge branches indentation 20844b and indentation 20844a anyhow It is the starting point of tearing at point, since the starting point that this tears, central discharge air portion 2084 can be along Liang Ge branches indentation 20844b and one anyhow indentation 20844a synchronized tearing, until tearing port is opened completely, so as to shorten gas in shell 100 The time of body release, improve the safety of secondary cell.

According to an exemplary embodiment, the angle, θ between each branch's indentation 20844b and anyhow indentation 20844a can To be chosen in the range of 120 °~150 °.Through analysis it is found that within this range, when tearing port from the point of intersection of three along three When paths extend, synchronization when three indentations can stay open when forming angle of substantially equal spacing, this is because, working as When gas quickly sprays, stress concentration point is the crosspoint of three indentations, which opens at first, and is in using the point as the center of circle It is radial to tear central discharge air portion 2084, if the angle at three indentation intervals is roughly equal, at each indentation institute by The impact force of the gas arrived is of substantially equal, and three indentations can be torn under identical gas impact force by synchronous.

In a kind of optional embodiment, the angle between each branch's indentation 20844b and anyhow indentation 20844a can be into one Step is chosen in the range of 130 °~140 °.At this point, the interval angles of three indentations more tend to be equal, central discharge air portion 2084 When being torn at indentation, the tearing process of branch indentation 20844b and indentation 20844a anyhow can be quicker, smooth, and tears The area bigger of breach.

On the other hand, in terms of the synchronism for improving tearing, the length that the application also sets up indentation 20844a anyhow is point 1.5 times of the length of branch indentation 20844b~2.5 times.Anyhow the length of indentation 20844a refers to that indentation 20844a is along it anyhow The length (as shown in Fig. 2, the extending direction of indentation 20844a is parallel to the length direction of coping plate anyhow) of extending direction, branch The length of indentation 20844b refers to that branch indentation 20844b extends along the length in direction (as shown in Fig. 2, branch's indentation The extending direction of the extending direction of 20844b and indentation 20844a anyhow are in non-zero angle).For the two of indentation 20844a anyhow End is respectively set for the scheme of branch indentation 20844b, the case where existing from two tearing initial points while opening, each It tears at initial point, if torn respectively along three roughly equal indentations of length, three torn paths are of substantially equal, then two The required time is roughly equal when a Y shape indentation tearing, almost synchronizes and is torn, so as to ensure that explosion-proof valve 208 is opened completely It is taken when opening shorter.

In a kind of optional embodiment, the length of indentation 20844a can be further arranged to branch indentation 20844b anyhow 1.8~2.2 times of length.So, the length for intersecting at three indentations at same tearing initial point is more nearly, then Synchronism higher when two Y shape indentations are opened.

Referring again to Fig. 4, central discharge air portion 2084 further includes transition part 20846, and protrusion 20844 is via transition part 20846 connect with flat base portion 20842, and transition part 20846 is obliquely installed relative to flat base portion 20842.Transition part 20846 can be with So that 20844 relatively flat base portion 20842 of protrusion is gradually prominent and forms the ridge shape protrusion gradually increased, meanwhile, transition part 20846 can also play the role of gas in guide housing 100 gathers to recessed portion, and tearing cross is finally formed in recessed portion The stress concentration phenomenon of straight indentation 20844a and branch indentation 20844b.

In a kind of exemplary embodiment, the inclination angle alpha of transition part 20846 could be provided as 2 °~15 ° (referring to figure 6), explosion-proof valve 208 is process using Sheet Metal Forming Technology, and transition part 20846 can be protrusion 20844 relative to flat base portion 20842, which protrude preset height, provides booster action, meanwhile, the setting of transition part 20846 can improve the processing of protrusion 20844 Craftsmanship, avoid protrusion 20844 swell it is excessively high cause central discharge air portion 2084 rupture.

It may be selected, the inclination angle alpha of transition part 20846 can be further arranged to 3 °~6 °.

Present invention also provides a kind of automobile, which includes the secondary cell in any of the above-described embodiment.

The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.

Claims (12)

1. a kind of secondary cell head cover explosion-proof valve, which is characterized in that

The explosion-proof valve includes flat base portion and relative to the flat outwardly projecting protrusion of base portion, and the protrusion is provided with cross Straight indentation and the branch's indentation for being connected to described indentation one end anyhow, the indentation anyhow are in non-zero angle with branch's indentation Degree.

2. explosion-proof valve according to claim 1, which is characterized in that the protrusion has ridge shape wedge angle, described explosion-proof The opposite inner surface of valve the and described protrusion has recessed portion corresponding with the dome shape.

3. explosion-proof valve according to claim 2, which is characterized in that the indentation anyhow may be contained with branch's indentation The top of the ridge shape wedge angle, and/or

Anyhow the indentation and branch's indentation may be contained within the bottom corresponding with the ridge shape wedge angle of the recessed portion.

4. explosion-proof valve according to claim 1, which is characterized in that branch's indentation be two, the indentation anyhow and Described two branch's indentations are Y-shaped.

5. explosion-proof valve according to claim 4, which is characterized in that described two branch's indentations are relative to the indentation anyhow Symmetrically, the both ends of the indentation anyhow are respectively connected with described two branch's indentations.

6. explosion-proof valve according to claim 1, which is characterized in that the angle between branch's indentation and the indentation anyhow Degree is 120 °~150 °.

7. explosion-proof valve according to claim 1, which is characterized in that the length of the indentation anyhow is branch's indentation 1.5 times of length~2.5 times.

8. according to claim 1-7 any one of them explosion-proof valves, which is characterized in that the explosion-proof valve further includes transition part, institute It states protrusion to connect with the flat base portion via the transition part, the relatively described flat base portion of the transition part is obliquely installed.

9. explosion-proof valve according to claim 8, which is characterized in that the angle of inclination of the transition part is 2 °~15 °.

10. a kind of secondary cell cap assembly, including coping plate and the explosion-proof valve for being connected to the coping plate, which is characterized in that The explosion-proof valve is claim 1~9 any one of them explosion-proof valve.

11. a kind of secondary cell, which is characterized in that including：

Electrode assembly；

Shell has opening；

And secondary cell cap assembly as claimed in claim 10,

Wherein, the secondary cell cap assembly is connected to the opening of the shell and forms encapsulated space, the electrode group Part is encapsulated in the encapsulated space, and the protrusion is protruded towards the direction far from the electrode assembly.

12. a kind of automobile, which is characterized in that including secondary cell as claimed in claim 11.