CN217768663U

CN217768663U - Explosion-proof valve, electric core, lithium cell and vehicle

Info

Publication number: CN217768663U
Application number: CN202221440446.2U
Authority: CN
Inventors: 梁善飞; 肖翔; 田志松; 王丰; 张金甫; 邓晓龙; 李东飞; 赵福成; 王瑞平
Original assignee: Zhejiang Geely Holding Group Co Ltd; Ningbo Geely Royal Engine Components Co Ltd; Aurobay Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Power Train Co Ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-11-08
Anticipated expiration: 2032-06-08

Abstract

An explosion-proof valve, a battery cell, a lithium battery and a vehicle. The explosion-proof valve includes: the explosion-proof valve base body is annular; the explosion-proof sheet is arranged on the inner side of the explosion-proof valve base body, the edge of the explosion-proof sheet is connected with the inner side wall of the explosion-proof valve base body, the explosion-proof sheet is provided with an explosion area, the explosion area comprises at least one explosion line, and the explosion-proof sheet comprises a first side face and a second side face which are arranged in a back-to-back mode; the first side face is provided with a first explosion-proof groove, the second side face is provided with a second explosion-proof groove, the first explosion-proof groove and the second explosion-proof groove are arranged along the blasting line, the first explosion-proof groove is arranged at all the blasting lines, and the second explosion-proof groove is arranged at least part of the blasting lines. The explosion-proof valve of this scheme all sets up explosion-proof groove through the both sides in the blasting district, can weaken the intensity in blasting district for the explosion-proof piece can make single electric core inefficacy along the orbit blasting in blasting district under the effect of internal pressure, and then prevents that the heat from stretching to peripheral electric core, avoids peripheral electric core to damage.

Description

Explosion-proof valve, electric core, lithium cell and vehicle

Technical Field

The present disclosure relates to, but is not limited to, vehicle battery technology, and more particularly to an explosion-proof valve, a cell, a lithium battery, and a vehicle.

Background

With the tightening of emission regulations, plug-in hybrid electric and pure electric power systems are increasingly favored by host plants. As a clean and efficient energy storage device, the lithium battery greatly improves the cruising ability of the whole vehicle, so that the market share of the pure electric vehicle rises year by year. As an important structure for guaranteeing safety performance of lithium battery, the explosion-proof valve directly influences safety of battery cell and module

At present, compare with upset piece explosion-proof construction, the explosion-proof valve of new generation lithium cell all adopts explosion-proof piece structure, or is a thin slice flat structure, or digs the groove structure of different shapes for the thin slice flat at the unilateral, and these both make explosion-proof valve structure simpler, and the cost is lower, but explosion-proof effect is not as good as upset piece explosion-proof construction. The lithium battery adopting the explosion-proof valve with the structure has the risk that the explosion-proof valve is not opened timely or the opening area is insufficient, so that the thermal runaway of a single battery can be spread to peripheral batteries.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an explosion-proof valve, all sets up explosion-proof groove through the both sides at the blasting district, can weaken the intensity in blasting district for the explosion-proof piece can make single electric core inefficacy along the orbit blasting of blasting district under the effect of internal pressure, and then prevents that the heat from stretching peripheral electric core, avoids peripheral electric core to damage.

The embodiment of the application provides an explosion-proof valve, includes: the explosion-proof valve base body is annular; the edge of the explosion-proof sheet is connected with the inner side wall of the explosion-proof valve base body, the explosion-proof sheet is provided with an explosion area, the explosion area comprises at least one explosion line, and the explosion-proof sheet comprises a first side surface and a second side surface which are arranged in a back-to-back manner; the first side face is provided with a first explosion-proof groove, the second side face is provided with a second explosion-proof groove, the first explosion-proof groove and the second explosion-proof groove are arranged along the blasting line, all the blasting line positions are provided with the first explosion-proof groove, and at least part of the blasting line positions are provided with the second explosion-proof groove.

The embodiment of the application provides an explosion-proof valve, including explosion-proof valve base member and explosion-proof piece, the explosion-proof valve base member is the annular, and the explosion-proof piece is arranged in the through-hole that the explosion-proof valve base member encloses, and the circumference edge of explosion-proof piece links to each other with the inside wall of explosion-proof valve base member, guarantees the integrality of explosion-proof valve. The explosion-proof valve base body is connected with other structures (such as a cover plate or a shell) of the battery cell, so that the assembly of the explosion-proof valve is realized.

Wherein, the explosion-proof piece is equipped with the blasting district, and the intensity in blasting district is less than the intensity at other positions of explosion-proof piece, therefore when the inside circuit breaking or the thermal runaway that takes place of electric core, the blasting district is broken away along the orbit of blasting line easily under the effect of internal pressure for electric core in time obtains the pressure release, in order to prevent the explosion. The two sides (i.e., the first side and the second side) of the rupture disk face one toward the pole core and the other faces away from the pole core. Because the first side is equipped with first explosion-proof groove along the blasting line, and the second side is equipped with the second explosion-proof groove along the blasting line, this is equivalent to all seted up explosion-proof groove on two sides in the blasting district for the cross-section in blasting district is roughly H-shaped.

Compared with an unslotted explosion-proof sheet, the explosion-proof sheet with the explosion-proof groove is arranged on one side, the strength of the explosion-proof groove is reduced, and the explosion of the explosion-proof valve is easily realized along the track of the explosion-proof groove. And the explosion-proof valve that this application embodiment provided, its blasting district both sides all are equipped with explosion-proof groove, therefore the intensity in blasting district obtains further weakening, changes in the track blasting pressure release along the blasting line under the effect of predetermineeing pressure, realizes along the effect of the timely accurate blasting of settlement orbit under predetermineeing pressure to solve current explosion-proof valve and can not follow the problem of the accurate timely blasting of settlement orbit. Like this, when single electric core takes place internal short circuit or thermal runaway, explosion-proof valve can in time accurate blasting make single electric core inefficacy, prevents that the heat from stretching to peripheral electric core, avoids peripheral electric core to damage.

Wherein, all the blasting lines are provided with first explosion-proof grooves to ensure that the strength of the blasting area is reliably weakened; at least part of the blasting lines are provided with second explosion-proof grooves to further weaken the strength of the blasting area and avoid local adhesion during blasting.

In an exemplary embodiment, the depth of the first explosion-proof groove is recorded as m, the depth of the second explosion-proof groove is recorded as n, the thickness of the explosion-proof sheet is recorded as c, and the m, the n and the c satisfy the following relation: n is less than or equal to m, and m + n is less than c.

In an exemplary embodiment, the first explosion-proof groove is a strip-shaped groove continuously arranged along the length direction of the blasting line; the second explosion-proof groove is a strip-shaped groove which is continuously arranged along the length direction of the blasting line; or the second explosion-proof groove comprises a plurality of grooves which are arranged at intervals along the length direction of the blasting line.

In an exemplary embodiment, the cross-sectional shape of the first explosion-proof groove is rectangular, triangular or semicircular; and/or the cross section of the second explosion-proof groove is rectangular, triangular or semicircular.

In an exemplary embodiment, the cross-sectional shape of the first explosion-proof groove is the same as that of the second explosion-proof groove, and the first explosion-proof groove and the second explosion-proof groove are arranged asymmetrically; or the cross-sectional shape of the first explosion-proof groove is different from that of the second explosion-proof groove; or the cross section shape of the first explosion-proof groove is the same as that of the second explosion-proof groove, and the first explosion-proof groove and the second explosion-proof groove are symmetrically arranged.

In an exemplary embodiment, the blast zone comprises a first blast line and a second blast line, and the first blast line and the second blast line are both arc-shaped and symmetrically arranged; the arc openings of the first blasting line and the second blasting line are opposite in direction, the first blasting line and the second blasting line are provided with an intersection area, and the width of the intersection area is larger than the width of other parts of the blasting area.

In an exemplary embodiment, both ends of the first burst wire and both ends of the second burst wire extend to an edge of the rupture disk.

In an exemplary embodiment, the blast zone includes a third blast line located at an edge of the rupture disk and arranged in a circumferential direction of the rupture disk.

The embodiment of the application also provides a battery cell, which comprises the explosion-proof valve in any one of the above embodiments.

The embodiment of the application also provides a lithium battery which comprises the battery core in the embodiment.

An embodiment of the present application further provides a vehicle, including: a vehicle body; and the lithium battery of the embodiment is arranged on the vehicle body.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application can be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

FIG. 1 is a schematic cross-sectional view of a cover plate assembly according to an embodiment of the present application;

FIG. 2 is a schematic view of an assembly of a housing and an explosion-proof valve provided by an embodiment of the application;

fig. 3 is a schematic structural diagram of two interposer provided in an embodiment of the present application;

fig. 4 is an exploded schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG. 5 is a schematic illustration of a top view of an explosion-proof valve provided in accordance with certain embodiments of the present application;

FIG. 6 isbase:Sub>A schematic sectional view taken along line A-A in FIG. 5;

FIG. 7 is an enlarged schematic view of one embodiment of section B of FIG. 6;

FIG. 8 is an enlarged schematic view of another embodiment of portion B of FIG. 6;

FIG. 9 is an enlarged schematic view of a portion B of FIG. 6;

fig. 10 is an enlarged schematic view of a portion B in fig. 6 according to another embodiment.

Wherein the reference numbers are as follows:

1, a cover plate component, 11 cover plates, 111 first pole column holes, 112 second pole column holes, 113 liquid injection holes, 12 insulation supports, 13 poles, 14 liquid injection covers, 15 insulation glue, 16 sealing gaskets and 17 insulation rings;

2 shell, 21 side enclosing plate, 22 bottom plate;

3, an adapter plate, 31 a first connecting plate, 32 a second connecting plate and 33 a fuse link;

4 pole core, 41 pole ear;

5 explosion-proof valve, 51 explosion-proof valve base body, 52 explosion-proof sheet, 521 first explosion-proof line, 522 second explosion-proof line, 523 third explosion-proof line, 524 intersection region, 531 first explosion-proof groove and 532 second explosion-proof groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

As shown in fig. 5 and 6, the present embodiment provides an explosion-proof valve 5, including: an explosion-proof valve base body 51 and an explosion-proof sheet 52. The explosion-proof valve base body 51 has a ring shape. The explosion-proof sheet 52 is provided inside the explosion-proof valve base body 51. The edge of the explosion-proof sheet 52 is connected with the inner side wall of the explosion-proof valve base body 51, the explosion-proof sheet 52 is provided with an explosion area, the explosion area comprises at least one explosion line, and the explosion-proof sheet 52 comprises a first side face and a second side face which are arranged in a back-to-back mode.

As shown in fig. 7 to 10, the first side surface is provided with a first explosion-proof groove 531, the second side surface is provided with a second explosion-proof groove 532, the first explosion-proof groove 531 and the second explosion-proof groove 532 are both arranged along the blasting line, the first explosion-proof groove 531 is arranged at all the blasting lines, and the second explosion-proof groove 532 is arranged at least part of the blasting lines.

The embodiment of the application provides an explosion-proof valve 5, including explosion-proof valve base member 51 and explosion-proof piece 52, explosion-proof valve base member 51 is the annular, and explosion-proof piece 52 is arranged in the through-hole that explosion-proof valve base member 51 encloses, and explosion-proof piece 52's circumferential edge links to each other with explosion-proof valve base member 51's inside wall, guarantees explosion-proof valve 5's integrality. The explosion-proof valve base body 51 is connected to other structures of the cell (e.g., the cover plate 11 or the housing 2) to assemble the explosion-proof valve 5.

Wherein, explosion-proof piece 52 is equipped with the blasting district, and the intensity in blasting district is less than the intensity at other positions of explosion-proof piece 52, therefore when circuit breaking or thermal runaway took place for electric core inside, the blasting district was broken away along the orbit of blasting line easily under the effect of internal pressure for electric core in time obtains the pressure release, in order to prevent to explode. The two sides (i.e., the first side and the second side) of the explosion-proof sheet 52 face one of the pole cores 4 and the other faces away from the pole core 4. Because the first side is provided with the first explosion-proof groove 531 along the blasting line, and the second side is provided with the second explosion-proof groove 532 along the blasting line, this is equivalent to the explosion-proof grooves are all opened at two sides of the blasting area, so that the cross section of the blasting area is roughly H-shaped.

Compared with the non-grooved explosion-proof sheet 52, the explosion-proof sheet 52 with the explosion-proof groove formed on one side has reduced strength at the explosion-proof groove part, so that the explosion of the explosion-proof valve 5 is easily realized along the track of the explosion-proof groove. And the explosion-proof valve 5 that this application embodiment provided, its blasting district both sides all are equipped with explosion-proof groove, therefore the intensity in blasting district obtains further weakening, changes in along the orbit blasting pressure release of blasting line under the effect of predetermineeing pressure, realizes along the effect of the timely accurate blasting of settlement orbit under predetermineeing pressure to solve current explosion-proof valve 5 can not be along the problem of the accurate timely blasting of settlement orbit. Like this, when single electric core takes place inside short circuit or thermal runaway, explosion-proof valve 5 can in time accurate blasting make single electric core inefficacy, prevents that the heat from stretching to peripheral electric core, avoids peripheral electric core to damage.

Wherein, all the blasting lines are provided with first explosion-proof grooves 531 to ensure that the intensity of the blasting area is reliably weakened; at least part of the blasting lines are provided with second explosion-proof grooves 532 to further weaken the strength of the blasting area and avoid local adhesion during blasting.

It will be appreciated that in the embodiments of the present application, the blast line has a certain width, but the width is much smaller than the length, and is therefore referred to as a blast line.

In an exemplary embodiment, the depth of the first explosion-proof groove 531 is denoted as m, the depth of the second explosion-proof groove 532 is denoted as n, the thickness of the explosion-proof sheet 52 is denoted as c, and m, n, c satisfy the following relationship: n is less than or equal to m, and m + n is less than c.

Thus, the first explosion-proof groove 531 is a main groove, and the second explosion-proof groove 532 is an auxiliary groove. The intensity that the main trough can guarantee the blasting district obtains effectively reducing, and the auxiliary groove can further reduce the intensity in blasting district, reduces the risk that the blasting district is local adhesion when taking place thermal runaway to be favorable to realizing the accurate timely blasting pressure release of explosion-proof valve 5.

In an exemplary embodiment, the first explosion-proof groove 531 is a strip-shaped groove continuously disposed along a length direction of the blasting line. The second explosion-proof groove 532 is a strip-shaped groove continuously arranged along the length direction of the blasting line. Alternatively, the second explosion-proof groove 532 includes a plurality of grooves spaced along the length of the blast line.

The first explosion-proof groove 531 is used as a main groove, and continuous strip-shaped grooves are adopted, so that explosion-proof grooves are formed in all the explosion lines in the explosion area, and the intensity of the explosion area is smaller than that of other parts of the explosion-proof piece 52.

The second explosion-proof groove 532 is used as an auxiliary groove, and may be a continuous strip-shaped groove or a discontinuous structure, and may be determined according to the use requirement, the material and the thickness of the explosion-proof sheet 52, and other factors.

In an exemplary embodiment, the width of the second explosion-proof groove 532 is less than or equal to the width of the first explosion-proof groove 531.

First explosion-proof groove 531 is as the main tank, and the width is some greatly relatively, is favorable to guaranteeing that explosion-proof area can in time accurately along predetermined orbit blasting pressure release. The second explosion-proof groove 532 serves as an auxiliary groove, and the width may be relatively small, and may be equal to the width of the first explosion-proof groove 531.

In an exemplary embodiment, the cross-sectional shape of the first burst disk 531 is rectangular (as shown in fig. 7, 8 and 10), triangular (as shown in fig. 9) or semicircular. The sectional shape of the second explosion-proof groove 532 is rectangular (as shown in fig. 7 and 10), triangular (as shown in fig. 8 and 9), or semicircular.

The sectional shape of the first explosion-proof groove 531 and the sectional shape of the second explosion-proof groove 532 refer to: the first explosion-proof groove 531 and the second explosion-proof groove 532 have shapes in cross section parallel to the thickness direction of the explosion-proof sheet 52.

The cross-sectional shape of the first anti-explosion groove 531 may be regular shapes such as rectangle, triangle (e.g., isosceles triangle, right triangle, etc.), semicircle, etc., or may be other regular shapes or irregular shapes.

The cross-sectional shape of the second explosion-proof groove 532 may also be a regular shape such as a rectangle, a triangle (such as an isosceles triangle, a right triangle, etc.), a semicircle, etc., or may also be other regular shapes or irregular shapes.

In an exemplary embodiment, the first burst disk 531 has a cross-sectional shape identical to that of the second burst disk 532 and is asymmetrically disposed, as shown in fig. 7.

In another exemplary embodiment, the first explosion proof groove 531 has a sectional shape different from that of the second explosion proof groove 532, as shown in fig. 8.

In still another exemplary embodiment, the first explosion-proof groove 531 has the same sectional shape as the second explosion-proof groove 532 and is symmetrically disposed, as shown in fig. 9 and 10.

The cross-sectional shape of the first anti-explosion groove 531 and the cross-sectional shape of the second anti-explosion groove 532 may be the same or different, and the cross-sectional shapes may be the same or different, and may be symmetrically arranged, such as mirror symmetry or central symmetry, or asymmetrically arranged (such as being rectangular but different in size, and both being triangular but different in size), and may be reasonably designed according to the use requirements and the material, size and other factors of the anti-explosion piece 52 in the actual production process.

In an exemplary embodiment, as shown in fig. 5, the blast zone includes a first blast line 521 and a second blast line 522, and the first blast line 521 and the second blast line 522 are both circular arc-shaped and symmetrically arranged. The arc openings of the first blasting line 521 and the second blasting line 522 are opposite, and the first blasting line 521 and the second blasting line 522 have a junction area 524, and the width of the junction area 524 is greater than the width of other parts of the blasting area.

In this way, the first blasting line 521 and the second blasting line 522 form a double-arc-shaped blasting area, so that the double-door effect of the rupture disk along the double-arc-shaped blasting line is realized, and timely and accurate blasting and pressure relief are realized. The width of the intersection area 524 of the first blasting line 521 and the second blasting line 522 is greater than the width of other parts of the blasting area, so that the intersection area 524 realizes blasting more easily, and then other parts of the blasting area are driven to crack therewith, so that the explosion-proof sheet 52 can blast and release pressure more easily, timely and accurately, and the use reliability of the explosion-proof valve 5 can be improved.

In an exemplary embodiment, as shown in fig. 5, both ends of the first blasting wire 521 and both ends of the second blasting wire 522 extend to the edge of the rupture disc 52.

Like this, the orbit in blasting district extends to the edge of rupture disk, is favorable to increasing the area of opening after the blasting of explosion-proof piece 52, and then further improves the pressure release area of electric core, further improves the safety in utilization of battery.

In an exemplary embodiment, as shown in fig. 5, the burst zone includes a third burst wire 523, and the third burst wire 523 is located at an edge of the rupture disc 52 and is disposed along a circumferential direction of the rupture disc 52.

Like this, when third blasting cord 523 explodes, whole rupture disk 52 can be opened completely, and this has further increased rupture disk 52's pressure release area, and then is favorable to further improving the safety in utilization of battery.

The track of the third blasting line 523 may be in a shape of a kidney, an ellipse, a circle, a square, or the like.

In one particular embodiment, as shown in FIG. 7, the blast zone includes a first blast line 521, a second blast line 522, and a third blast line 523. The first explosion-proof groove 531 has a rectangular cross section, the second explosion-proof groove 532 has a rectangular cross section, and the first explosion-proof groove 531 and the second explosion-proof groove 532 are arranged asymmetrically. The width of the first explosion-proof groove 531 is equal to the width of the second explosion-proof groove 532 is equal to a, and the depth m of the first explosion-proof groove 531 is greater than the depth n of the second explosion-proof groove 532.

In another particular embodiment, as shown in FIG. 8, the blast zone includes a first blast line 521, a second blast line 522, and a third blast line 523. The first explosion-proof groove 531 has a rectangular cross-sectional shape, and the second explosion-proof groove 532 has a triangular cross-sectional shape (specifically, an isosceles triangle). The width of the first explosion-proof groove 531 is equal to the width of the second explosion-proof groove 532 is equal to a, and the depth m of the first explosion-proof groove 531 is greater than the depth n of the second explosion-proof groove 532.

In yet another embodiment, as shown in FIG. 9, the blast zone includes a first blast line 521, a second blast line 522, and a third blast line 523. The first anti-explosion groove 531 has a triangular cross section (specifically, a right triangle), the second anti-explosion groove 532 has a triangular cross section (specifically, a right triangle), and the first anti-explosion groove 531 and the second anti-explosion groove 532 are in central symmetry. The width of the first explosion-proof groove 531 is equal to the width of the second explosion-proof groove 532 is equal to a, and the depth m of the first explosion-proof groove 531 is equal to the depth n of the second explosion-proof groove 532.

In yet another embodiment, as shown in FIG. 10, the blast zone includes a first blast line 521, a second blast line 522, and a third blast line 523. The first explosion-proof groove 531 is rectangular in cross-sectional shape, the second explosion-proof groove 532 is rectangular in cross-sectional shape, and the first explosion-proof groove 531 and the second explosion-proof groove 532 are mirror-symmetric. The width of the first explosion-proof groove 531 is equal to the width of the second explosion-proof groove 532 is equal to a, and the depth m of the first explosion-proof groove 531 is equal to the depth n of the second explosion-proof groove 532.

Compared with the conventional explosion-proof valve 5, the explosion-proof valve 5 has the advantages of simple structure, low cost and capability of accurately controlling the opening pressure and the opening position.

Of course, the blast zone is not limited to the forms of the first blast line 521, the second blast line 522, and the third blast line 523 described above. For example, the blast zone may not include the third blast line 523, or the blast zone may include only the third blast line 523. Similarly, the first burst wire 521 is not limited to the circular arc shape, the second burst wire 522 is not limited to the circular arc shape, and the third burst wire 523 is not limited to the circular ring shape.

As shown in fig. 4, an embodiment of the present application further provides a battery cell, which includes the explosion-proof valve 5 according to any one of the foregoing embodiments, so that all beneficial effects of any one of the foregoing embodiments are achieved, and details are not described herein.

In an exemplary embodiment, as shown in fig. 4, the battery cell includes: the pole piece assembly comprises a housing 2, at least one pole piece 4, a cover plate assembly 1, a plurality of adapter plates 3 and at least one explosion-proof valve 5. Wherein, one end of the shell 2 is provided with an opening. The pole piece 4 is disposed within the housing 2. The cover plate component 1 covers the opening end of the shell 2. The plurality of adaptor pieces 3 are provided to be electrically connected to the tab 41 of the pole core 4 and the pole 13 of the cover plate assembly 1. The case 2 is also filled with an electrolyte.

In an exemplary embodiment, the explosion-proof valve 5 is provided in the cover plate assembly 1.

In another exemplary embodiment, the explosion-proof valve 5 is provided in the housing 2, as shown in fig. 2 and 4.

For the conventional scheme of arranging the explosion-proof valve 5 on the cover plate assembly 1, because the area of the cover plate assembly 1 is small, the positive and negative poles 13, the liquid injection cover 14 and the explosion-proof valve 5 are also arranged on the limited cover plate 11 panel, so that the area of the explosion-proof valve 5 is quite limited. When the battery is in an abuse condition and internal short circuit or thermal runaway occurs, the accident that the opening area of the explosion-proof valve 5 is insufficient to cause battery explosion often occurs.

And this application embodiment establishes explosion-proof valve 5 on the casing 2 of electric core, because the area of casing 2 compares in apron subassembly 1 and will be much bigger, therefore can set up two, three or more explosion-proof valve 5 even on casing 2, and single explosion-proof valve 5's area also can increase, makes the pressure release area of battery increase by a wide margin from this to the security of battery has greatly been promoted.

As shown in fig. 1, the cover plate assembly 1 includes: a cover plate 11, an insulating bracket 12 and two poles 13.

The lid plate 11 is provided with a first pole hole 111, a liquid inlet 113, and a second pole hole 112 in this order along the longitudinal direction.

The insulating support 12 is connected to the surface of the cover plate 11 facing the pole core 4 of the cell. The insulating support 12 is provided with through holes which are in one-to-one correspondence communication with the first pole holes 111, the liquid injection holes 113 and the second pole holes 112.

The two poles 13 are respectively disposed in the first pole hole 111 and the second pole hole 112.

The cover plate assembly 1 provided by the embodiment is applied to the electric core of the explosion-proof valve 5 arranged on the shell 2, namely: the explosion-proof valve 5 of electric core is located casing 2, rather than locating apron subassembly 1, therefore the explosion-proof valve 5 has been cancelled to the apron subassembly 1 that this application embodiment provided, and then the mounting hole that is used for installing explosion-proof valve 5 has been cancelled to apron 11, and this makes apron 11 structure simpler, and manufacturing process is simpler, therefore can reduce technology cost. Moreover, because the explosion-proof valve 5 is eliminated from the cover plate assembly 1, the insulating support 12 can eliminate a ventilation structure corresponding to the explosion-proof valve 5, so that the structure of the insulating support 12 is simplified, the installation height of the insulating support 12 can be reduced, and the cost of the insulating support 12 can be reduced.

Because the area of the shell 2 is much larger than that of the cover plate assembly 1, two, three or more explosion-proof valves 5 can be arranged on the shell 2, and the area of a single explosion-proof valve 5 can also be increased, so that the pressure relief area of the battery can be greatly increased, and the safety of the battery is greatly improved.

In one example, as shown in fig. 1, the cover plate assembly 1 further includes a liquid injection cover 14, an insulating glue 15, a sealing gasket 16, an insulating ring 17, and the like. The liquid injection cover 14 is arranged at the liquid injection hole 113, and ensures the sealing of the liquid injection hole 113 when liquid injection is not needed. The insulating glue 15 and the sealing gasket 16 are arranged between the pole 13 and the corresponding pole holes (the positive pole corresponds to the first pole hole 111, and the negative pole corresponds to the second pole hole 112), so that the insulation and the sealing between the pole 13 and the cover plate 11 are realized. The insulating glue 15 is sleeved on the boss outside the pole column 13, so that the cover plate 11 is insulated from an external copper bar.

In an exemplary embodiment, as shown in fig. 1, the first and second pole holes 111 and 112 are provided at both end edge regions of the lid plate 11, the pour hole 113 is provided at a middle region of the lid plate 11, and the first and second pole holes 111 and 112 are symmetrically provided at both sides of the pour hole 113.

When the explosion-proof valve 5 is integrally mounted on the cover plate 11, the explosion-proof valve 5 is generally disposed at the middle position of the cover plate 11, so that the liquid injection hole 113 can be disposed only near one side of the positive and negative poles 13, which makes the liquid injection process more complicated. The anti-explosion valve 5 is omitted, so that the liquid injection hole 113 can be arranged at the central position of the cover plate 11, the distance between the liquid injection hole 113 and the two polar columns 13 is large, the influence of the anti-explosion valve 5 is avoided, and the liquid injection process is simple and rapid.

In an exemplary embodiment, as shown in fig. 1, the insulating support 12 is a sheet structure, and the insulating support 12 is adhesively fixed to the cover plate 11.

As before, because the explosion-proof valve 5 has been cancelled to the apron subassembly 1, insulating support 12 can cancel the ventilation structure who corresponds the setting with explosion-proof valve 5, also can reduce the mounting height of insulating support 12, therefore insulating support 12 can adopt the sheet structure, also need not to design buckle/draw-in groove structure on apron 11 and insulating support 12 in the installation and realize the joint cooperation of insulating support 12 and apron 11, directly with insulating support 12 with sticky the pasting on apron 11 can, so both reduced the processing cost of apron 11 and insulating support 12, the installation space of utmost point core 4 has been increased again, and then increased the space utilization of electric core, still alleviateed the weight of insulating support 12, thereby can increase the performance of electric core, mass density and bulk density, reach and subtract the effect of heavy increase.

In an exemplary embodiment, the thickness of the insulating support 12 is less than or equal to 1mm, such as 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, and the like.

In one example, the thickness of the insulating support 12 is less than or equal to 0.8mm.

Of course, the thickness of the insulating support 12 is not limited to the above range, and may be adjusted as needed in the actual production process.

In an exemplary embodiment, as shown in fig. 1, the surface of the cover plate 11 facing away from the pole piece 4 is provided as a flat surface at the liquid injection hole 113.

As before, for the cover plate assembly 1 with the conventional explosion-proof valve 5, the liquid injection process is complicated, and a boss structure needs to be arranged outside the liquid injection hole 113 to prevent liquid leakage in the liquid injection process.

And the explosion-proof valve 5 has been cancelled to the apron subassembly 1 of this application embodiment for annotate liquid hole 113 can set up the central point that puts at the apron 11, and the interference that the notes liquid process received is less, therefore can cancel the boss structure of annotating the liquid hole 113 outside, with the apron 11 surface (being the upper surface of apron 11 or called the surface) of utmost point core 4 of keeping away from sets up to the plane in annotating liquid hole 113 department, makes the structure of apron 11 succinct more, and the manufacturing difficulty is lower, thereby further reduces the technology cost.

And a boss can be arranged on the surface of the cover plate 11 facing the pole core 4 at the liquid injection hole 113, so that the electrolyte can quickly flow into the shell 2 along the inner hole of the boss.

In an exemplary embodiment, the two poles 13 of the cover plate assembly 1 are a positive pole and a negative pole, respectively, and each pole core 4 includes a positive pole tab and a negative pole tab.

As shown in fig. 3 and 4, the number of the adaptor pieces 3 is two, the two adaptor pieces 3 are respectively a positive adaptor piece and a negative adaptor piece, the positive adaptor piece is configured to connect a positive pole column and a plurality of positive pole tabs, and the negative adaptor piece is configured to connect a negative pole column and a plurality of negative pole tabs.

As shown in fig. 3, the interposer 3 includes a first connection plate 31, a fuse 33, and a plurality of second connection plates 32, one end of the fuse 33 is connected to the first connection plate 31, the other end of the fuse 33 is connected to the plurality of second connection plates 32, the first connection plate 31 is electrically connected to the electrode post 13, and the plurality of second connection plates 32 are electrically connected to corresponding electrode tabs 41 of the plurality of electrode cores 4, respectively.

In other words, the first connecting piece 31 of the positive electrode adapting piece is electrically connected with the positive electrode pole, and the plurality of second connecting pieces 32 of the positive electrode adapting piece are respectively electrically connected with the plurality of positive electrode lugs; the first connecting sheet 31 of the negative electrode adapter sheet is electrically connected with the negative electrode pole, and the plurality of second connecting sheets 32 of the negative electrode adapter sheet are respectively electrically connected with the plurality of negative electrode pole lugs.

This scheme has realized two utmost point cores 4 or the parallelly connected of more utmost point cores 4 of electricity core, can increase the output current of single electric core, and then increases the output current of battery. The two adapter pieces 3 can realize the electrical connection between the two poles 13 and the plurality of battery cells.

Wherein, the utmost point ear connection position of switching piece 3 includes a plurality of second connection pieces 32, has adopted the fork-shaped structure in the utmost point ear connection position equivalently, divides into two forks or even more forks, can realize that the utmost point core 4 is two parallelly connected or even more parallelly connected.

In an exemplary embodiment, as shown in fig. 3, the first connection plate 31 and the plurality of second connection plates 32 are arranged to be offset in the thickness direction of the interposer 3. The area of the first connecting piece 31 is smaller than that of the second connecting piece 32.

Thus, the adapter plate 3 is roughly in a Z-shaped structure, the joint surface with the pole 13 is a small surface, and the joint surface with the pole 41 is a large surface, so that the adapter plate can be conveniently matched and welded with the pole 13.

In an exemplary embodiment, the interposer 3 has a thickness in a range of 0.6mm to 0.8mm, such as 0.6mm, 0.7mm, 0.8mm, and the like.

In other words, the interposer 3 has a sheet-like structure and can be formed by punching an aluminum plate or a copper plate.

Of course, the thickness of the interposer 3 is not limited to the above range, and may be adjusted as needed in the actual production process.

In an exemplary embodiment, as shown in fig. 2 and 4, the number of the explosion-proof valves 5 is plural, and the plural explosion-proof valves 5 are spaced apart from each other on the same side of the housing 2.

Set up a plurality of explosion-proof valves 5, compare in only setting up an explosion-proof valve 5, can make the pressure release area of electric core become the twice even multifold, increased the pressure release area of electric core by a wide margin, realized the dual fail-safe of explosion-proof function and even more the heavy fail-safe, greatly improved the security of battery.

And locate the same side of casing 2 with a plurality of blast proof valves 5, can make electric core to same direction blasting, reduce the influence to other electric cores of periphery.

In an exemplary embodiment, as shown in fig. 2, the case 2 includes a bottom plate 22 and a side shroud 21, one end of the side shroud 21 is connected to a circumferential edge of the bottom plate 22, and the other end of the side shroud 21 is formed to be open and connected to the cap assembly 1; the explosion-proof valve 5 is provided on the side coaming 21.

In this way, when the battery is assembled to the vehicle, the side surface provided with the explosion-proof valve 5 can be disposed facing upward, which does not result in the terminal 13 of the lid assembly 1 facing downward, facilitating reliable use of the battery.

The embodiment of the present application further provides a lithium battery (not shown in the figure), which includes the battery cell according to the above embodiment, and thus has all the beneficial effects of any of the above embodiments, which are not described herein again.

The battery core is electrically connected with the protection circuit board.

The embodiment of the application also provides a vehicle (not shown in the figure), which comprises a vehicle body and the lithium battery of the embodiment, and the lithium battery is installed on the vehicle body.

The vehicle provided by the embodiment of the application comprises the lithium battery of the embodiment, so that all the beneficial effects of any embodiment are achieved, and the description is omitted.

In an exemplary embodiment, the explosion-proof valve 5 of the lithium battery is provided in the case 2, and the explosion-proof valve 5 is disposed upward.

When the explosion-proof valve 5 is arranged upwards, the electrolyte in the shell 2 can be prevented from submerging the explosion-proof valve 5, and when thermal runaway occurs, gas flows upwards, so that the explosion-proof valve 5 is conveniently and timely broken to realize the purpose of pressure relief.

To sum up, explosion-proof valve, electric core, lithium cell and vehicle that this application embodiment provided have following beneficial effect:

1) The explosion-proof valve on the apron has been cancelled, the boss outside annotating the liquid hole, with insulating support complex buckle structure for the structure of apron is more succinct, can adopt a dull and stereotyped punching press three holes on the whole can, two post holes lean on both sides to arrange, annotate the liquid hole and arrange in the centre, can greatly reduce the processing cost of apron like this, thereby solved and installed the explosion-proof valve on the current apron, insulating support detains on the apron through the buckle and leads to the complicated problem of apron processing technology.

2) The air vent structure of the insulating support and the clamping groove structure during installation are eliminated, the insulating support is designed into an insulating sheet with the thickness less than or equal to 1mm, the insulating sheet is attached to the inner side of the cover plate through viscose, and the structure can reduce the process cost and the material cost while reducing weight and increasing volume, so that the problem of low space utilization rate of the battery cell caused by large weight and height of the conventional insulating support is solved.

3) In order to increase the output current of the battery, the two switching pieces are designed into a Z-shaped sheet, the thickness of the sheet is 0.6mm to 0.8mm, the lug connection part is designed into a fork structure, and the two-column or even more-column parallel connection of the pole cores is realized by two-column or even more-column parallel connection, so that the output current of a single battery core is twice or even more times of the original output current.

4) In order to improve the safety of the battery and prevent the battery from being exploded when being broken or thermally out of control, two or more explosion-proof valves are arranged on the upward side surface of the shell (after loading), so that the pressure relief area of the battery is changed into two times or even more times, and the safety of the battery is greatly improved.

5) The explosion-proof piece is precut on two sides, the strength of the precut part on the two sides is weaker than that of other areas, and the explosion-proof piece can be accurately blasted along the position of the explosion-proof slot when the internal pressure reaches the preset pressure. Like this, weaken the intensity of explosion-proof piece specific area through the mode of two-sided nick, can make explosion-proof piece make single electric core inefficacy along the orbit blasting of seting up of nick under the effect of internal pressure, prevent that the heat from stretching to peripheral electric core, avoid peripheral electric core to damage, solve current explosion-proof piece formula explosion-proof valve opening pressure and the problem of opening pressure accurate inadequately from this.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" word structure "and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the structure referred to has a specific direction, is constructed and operated in a specific direction, and thus, cannot be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An explosion-proof valve, comprising:

the explosion-proof valve base body is annular; and

the explosion-proof piece is arranged on the inner side of the explosion-proof valve base body, the edge of the explosion-proof piece is connected with the inner side wall of the explosion-proof valve base body, the explosion-proof piece is provided with an explosion area, the explosion area comprises at least one explosion line, and the explosion-proof piece comprises a first side face and a second side face which are arranged in a back-to-back mode;

the first side face is provided with a first explosion-proof groove, the second side face is provided with a second explosion-proof groove, the first explosion-proof groove and the second explosion-proof groove are arranged along the blasting line, all the blasting line positions are provided with the first explosion-proof groove, and at least part of the blasting line positions are provided with the second explosion-proof groove.

2. Explosion-proof valve according to claim 1,

the depth of the first explosion-proof groove is recorded as m, the depth of the second explosion-proof groove is recorded as n, the thickness of the explosion-proof sheet is recorded as c, and the m, the n and the c satisfy the following relations:

n≤m，m+n＜c。

3. explosion-proof valve according to claim 2,

the first explosion-proof groove is a strip-shaped groove which is continuously arranged along the length direction of the blasting line;

the second explosion-proof groove is a strip-shaped groove which is continuously arranged along the length direction of the blasting line; or the second explosion-proof groove comprises a plurality of grooves which are arranged at intervals along the length direction of the blasting line.

4. Explosion-proof valve according to any one of claims 1 to 3,

the cross section of the first explosion-proof groove is rectangular, triangular or semicircular; and/or

The cross section of the second explosion-proof groove is rectangular, triangular or semicircular.

5. Explosion-proof valve according to any one of claims 1 to 3,

the cross section shape of the first explosion-proof groove is the same as that of the second explosion-proof groove, and the first explosion-proof groove and the second explosion-proof groove are arranged asymmetrically; or

The cross-sectional shape of the first explosion-proof groove is different from that of the second explosion-proof groove; or

The cross-sectional shape of the first explosion-proof groove is the same as that of the second explosion-proof groove, and the first explosion-proof groove and the second explosion-proof groove are symmetrically arranged.

6. Explosion-proof valve according to any one of claims 1 to 3,

the blasting area comprises a first blasting line and a second blasting line, and the first blasting line and the second blasting line are both arc-shaped and symmetrically arranged;

the arc openings of the first blasting line and the second blasting line are opposite in direction, the first blasting line and the second blasting line are provided with an intersection area, and the width of the intersection area is larger than the width of other parts of the blasting area.

7. Explosion-proof valve according to claim 6,

and two ends of the first blasting line and two ends of the second blasting line extend to the edge of the explosion-proof sheet.

8. Explosion-proof valve according to any one of claims 1 to 3,

the blasting area comprises a third blasting line, and the third blasting line is located at the edge of the explosion-proof piece and is arranged along the circumferential direction of the explosion-proof piece.

9. An electrical core comprising the explosion-proof valve of any of claims 1 to 8.

10. A lithium battery comprising a cell as claimed in claim 9.

11. A vehicle, characterized by comprising:

a vehicle body; and

the lithium battery of claim 10 mounted to the vehicle body.