CN219801087U - Lower plastic, end cover assembly, battery and energy storage device - Google Patents

Abstract

The application provides a lower plastic, an end cover assembly, a battery and an energy storage device. The lower plastic comprises: the anti-explosion net comprises an air hole, a connecting part and a first reinforcing part, wherein the air hole is formed in the connecting part, the air hole penetrates through the connecting part in the thickness direction of the lower plastic body, the connecting part surrounds the periphery of the air hole and is connected with the lower plastic body, the first reinforcing part is convexly arranged on the connecting part in the thickness direction of the lower plastic body, and the first reinforcing part partially covers the air hole. The lower plastic provided by the application can solve the technical problems that the lower plastic explosion-proof net in the prior art has lower strength, so that the lower plastic explosion-proof net is easy to generate the phenomena of compression deformation or thermal shrinkage, and the safety performance and the use reliability of the battery are greatly influenced.

Description

Lower plastic, end cover assembly, battery and energy storage device

Technical Field

The application relates to the technical field of batteries, in particular to a lower plastic, an end cover assembly, a battery and an energy storage device.

Background

The chargeable and dischargeable battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and has wide application in the fields of electric automobiles, mobile equipment and the like.

The lower plastic is one of the important structural members of the battery end cap assembly. The lower plastic is usually provided with an explosion-proof net through which the gas in the battery can overflow to the explosion-proof valve. When a certain pressure is reached in the battery, the gas is discharged from the explosion-proof valve. The strength of the existing lower plastic explosion-proof net is lower, so that the phenomenon that the lower plastic explosion-proof net is easy to deform under pressure or shrink under heat is caused, and the safety performance and the use reliability of the battery are greatly affected.

Disclosure of Invention

The utility model provides a lower plastic, an end cover assembly, a battery and an energy storage device, which are used for solving the technical problems that the lower plastic explosion-proof net is low in strength, so that the lower plastic explosion-proof net is easy to deform under pressure or shrink under heating, and the safety performance and the use reliability of the battery are greatly influenced.

In order to solve the above problems, in a first aspect, the present utility model provides a lower plastic, comprising: the anti-explosion net comprises an air hole, a connecting part and a first reinforcing part, wherein the air hole is formed in the connecting part, the air hole penetrates through the connecting part in the thickness direction of the lower plastic body, the connecting part surrounds the periphery of the air hole and is connected with the lower plastic body, the first reinforcing part is convexly arranged on the connecting part in the thickness direction of the lower plastic body, and the first reinforcing part partially covers the air hole. As can be appreciated, by arranging the first reinforcing part on the air vent, the first reinforcing part is connected with the connecting parts positioned at two opposite sides of the air vent, on one hand, the deformation of the connecting part at the periphery of the air vent during assembly or when the air pressure in the battery cell is large can be avoided, and the compressive strength and the deformation resistance of the connecting part at the periphery of the air vent are greatly improved; on the other hand, after setting up first enhancement portion, under the intensity of connecting portion reaches the condition of operation requirement, can attenuate the thickness of connecting portion, and then attenuate explosion-proof net for the protruding height of second surface, for the battery provides more inside accommodation space in order to be used for holding the electric core to improve the volumetric energy density of battery. Through the part cover bleeder vent of first enhancement portion, can play certain fender class and reposition of redundant personnel effect to the gas of bleeder vent department, when avoiding the atmospheric pressure in the battery great, short time concentrate from the bleeder vent to wash to explosion-proof valve department for explosion-proof valve breaks away from the battery completely under the effect of high-pressure gas and causes the splash, thereby improves the security performance and the reliability of use of battery.

In a possible implementation manner, the outer periphery of the air hole comprises a first circular arc section, a second circular arc section, a first straight line section and a second straight line section, the first circular arc section and the second circular arc section are oppositely arranged, the first straight line section is connected with one end of the first circular arc section and one end of the second circular arc section, and the second straight line section is connected with the other end of the first circular arc section and the other end of the second circular arc section; the first reinforcing part comprises a first reinforcing rib, the extending direction of the first reinforcing rib is the direction of the first straight line section towards the second straight line section, and the first reinforcing rib at least partially covers the air holes.

It will be appreciated that the connection on the side of the first straight line segment of the vent remote from the second straight line segment, the connection forming material at that location is less likely to result in poor structural strength. Through setting up first strengthening rib on the bleeder vent, the connecting portion that is located the relative both sides of bleeder vent is connected to first strengthening rib, on the one hand, can avoid the connecting portion of bleeder vent periphery to take place to warp when the assembly or the atmospheric pressure in the electric core is great, improves compressive strength and the anti deformation strength of connecting portion of strengthening the bleeder vent periphery greatly.

In one possible embodiment, the first reinforcing portion further includes a second reinforcing rib, an extending direction of the second reinforcing rib intersects with an extending direction of the first reinforcing rib, the second reinforcing rib is connected with the first reinforcing rib, and the second reinforcing rib at least partially covers the ventilation hole.

It can be understood that through setting up the second strengthening rib, the extending direction of second strengthening rib is crossing in the extending direction of first strengthening rib, on the one hand, can provide the structural strength reinforcing position and the supporting force that are different from first strengthening rib for the connecting portion of bleeder vent periphery and the second strengthening portion in the bleeder vent to further improve compressive strength and the anti-deformation intensity of explosion-proof net. On the other hand, after setting up first strengthening rib and second strengthening rib, connecting portion intensity reaches under the condition of operation requirement, can further attenuate connecting portion's thickness to further attenuate explosion-proof net for the protruding height of second surface, further provide more accommodation space for holding the electric core for the battery inside, thereby further improve the volume energy density of battery.

In a possible implementation manner, the first reinforcing ribs are perpendicular to the second reinforcing ribs, the number of the first reinforcing ribs is multiple, and the first reinforcing ribs are distributed at intervals along the direction of the first arc section towards the second arc section;

the second reinforcing rib comprises at least one first part, two second parts and two third parts, wherein each first part is connected between two adjacent first reinforcing ribs, one second part is positioned on one side of each first reinforcing rib, the other second part is positioned on the other side of each first reinforcing rib, each third part is connected to one end, far away from each first reinforcing rib, of each second part, along the extending direction of each second reinforcing rib, one third part, one second part, one first reinforcing rib and one first part are sequentially connected, the width D1 of each first part is larger than the width D3 of each third part, and the maximum width D2 of each second part is larger than or equal to the width D3 of each third part.

It can be understood that through setting up perpendicularly of second strengthening rib and first strengthening rib, can make two adjacent first strengthening ribs and partial second strengthening rib constitute "worker" font structure, when receiving the effort along the length direction X of lower plastic body or along the width direction Y of lower plastic body, first strengthening rib and second strengthening rib can rely on each other in order to disperse the atress, and then further improve compressive strength and the anti deformation strength of the connecting portion of bleeder vent periphery and the second strengthening portion in the bleeder vent to guarantee the structural strength and the reliability of use of explosion-proof net better. The width D1 of the first part is larger than the width D3 of the third part, the width of the first part between two adjacent first reinforcing ribs is increased, the structural strength of the first reinforcing ribs and the second reinforcing ribs after forming an I-shaped structure can be further enhanced, and the structural support strength of the central area of the explosion-proof net can be also enhanced, so that the structural strength and the use reliability of the explosion-proof net are further ensured. By setting the maximum width D2 of the second part to be larger than or equal to the width D3 of the third part, on one hand, the structural strength of the intersection of the first reinforcing rib and the third part can be ensured, and the structural strength and the use reliability of the explosion-proof net are further ensured; on the other hand, can guarantee the ventilative area of the bleeder vent of anti-explosion net between first strengthening rib and first arch, when reaching certain atmospheric pressure and temperature in the battery, the second strengthening portion between first strengthening rib and the first arch takes place to fuse in order to further increase the exhaust area of anti-explosion net, guarantees the timely discharge of the gas in the battery to guarantee the security performance and the reliability in use of battery.

In one possible implementation manner, the lower plastic body further comprises two first protrusions, the two first protrusions are arranged on the lower plastic body, and the two first protrusions are arranged on two opposite sides of the connecting part along the extending direction of the second reinforcing rib; each first bulge is connected with the connecting part and protrudes relative to the connecting part along the thickness direction of the lower plastic body, the second reinforcing rib is connected with the first bulge, and the protruding height of the first bulge relative to the connecting part is larger than or equal to that of the first reinforcing rib relative to the connecting part.

It can be understood that through setting up the protrusion height that first arch is greater than or equal to the protrusion height of first strengthening rib relative junction portion for the junction portion, both can guarantee that the explosion-proof net is equipped with one side of first strengthening rib and be difficult to receive the extrusion, and then guarantee the structural strength of explosion-proof net, can play certain spacing supporting role to the electric core through the first arch of explosion-proof net both sides again, avoid first strengthening rib to insert electric core terminal surface and lead to electric core tip fold or pole piece short circuit, guarantee the security performance of battery. The protruding height of the first protrusion relative to the connecting part is equal to the protruding height of the first reinforcing rib relative to the connecting part, so that the first protrusion and the first reinforcing rib can play a certain limiting supporting role on the battery cell on the same plane, the limiting supporting strength of the lower plastic to the battery cell is ensured, and the use reliability of the battery is further improved.

In a possible implementation manner, along the extending direction of the first reinforcing rib, one end of the lower plastic body is provided with a second protrusion, the other end of the lower plastic body is also provided with a third protrusion, along the thickness direction of the lower plastic body, the second protrusion and the third protrusion are all arranged in a protruding manner of the lower plastic body, along the extending direction of the first connecting rib, the second protrusion, the first protrusion and the third protrusion are arranged, the second protrusion is further provided with a first extension part, the first extension part is extended and arranged relative to the second protrusion along the thickness direction of the lower plastic body by the outer periphery of the second protrusion, and/or the third protrusion is further provided with a second extension part, and the second extension part is extended and arranged relative to the third protrusion along the thickness direction of the lower plastic body by the outer periphery of the third protrusion.

As can be appreciated, the first extension part is arranged on the second protrusion, and/or the second extension part is arranged on the third protrusion, so that on one hand, the hot melting area of the lower plastic and the battery cell insulating film can be further increased, the connection effect of the lower plastic and the battery cell insulating film is improved, and the safety performance and the use reliability of the battery are further ensured; on the other hand, under the condition that the hot melting area of the lower plastic and the battery core insulating film meets the use requirement, the protruding height of the second protrusion relative to the second surface can be reduced, the weight of the lower plastic is reduced, more accommodating spaces are provided for accommodating the battery core, and therefore the volume energy density and the energy density of the battery are improved.

In a possible implementation manner, the first extending portion further comprises a first supporting portion, the first supporting portion is located on one side, close to the first protrusion, of the first extending portion, one end of the first supporting portion is connected with the first extending portion, the other end of the first supporting portion is connected with the second protrusion, and the height of the first supporting portion is smaller than that of the first extending portion along the thickness direction of the lower plastic body; and/or, the second extension part further comprises a second support part, the second support part is positioned on one side of the second extension part, which is close to the first bulge, one end of the second support part is connected with the second extension part, the other end of the second support part is connected with the third bulge, and the height of the second support part is smaller than that of the second extension part along the thickness direction of the lower plastic body.

Through setting up the height that highly is less than first extension of first supporting part to/or, the height that highly is less than the second extension of second supporting part, after the battery assembly, both can avoid first supporting part and second supporting part to contradict the electric core in the battery, can reduce the space occupation of supporting part in the battery direction of height under the circumstances that the effect reaches the operation requirement of guaranteeing to support again, lighten the weight of lower plastic and be used for holding the electric core for the inside more accommodation space that provides of battery to improve the volume energy density and the energy density of battery.

In a second aspect, the present application provides an end cap assembly, including an end cap and the lower plastic, including an end cap, an explosion-proof valve, and the lower plastic, where the end cap and the lower plastic are stacked, the end cap includes an end cap body and an explosion-proof through hole, the explosion-proof through hole penetrates the end cap body along a thickness direction of the end cap body, the explosion-proof valve is located in the explosion-proof through hole and is connected with a hole wall of the explosion-proof through hole, the ventilation portion is disposed in communication with the explosion-proof through hole, and the first reinforcement portion is located on a side of the ventilation portion facing away from the explosion-proof through hole.

In a third aspect, the application provides a battery, a housing, a battery cell and the end cap assembly, wherein the battery cell is arranged in the housing, the end cap assembly is matched with the housing to seal the battery cell, and the end cap assembly is electrically connected with the battery cell.

In a fourth aspect, the present application provides an energy storage device, including a housing and a plurality of batteries, where the plurality of batteries are electrically connected, and the plurality of batteries are electrically connected in at least one of series connection and parallel connection.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.

FIG. 1 is a schematic view of a lower plastic according to an embodiment of the present application;

FIG. 2 is a schematic top view of the lower plastic of FIG. 1;

FIG. 3 is a schematic view of the lower plastic of FIG. 1 at an angle;

FIG. 4 is a schematic cross-sectional view of the lower plastic of FIG. 1 along the direction A-A;

FIG. 5 is a schematic view of a lower plastic structure according to another embodiment of the present application;

FIG. 6 is a schematic top view of the lower plastic of FIG. 5;

FIG. 7 is a schematic illustration of an end cap assembly according to one embodiment of the present application;

FIG. 8 is an exploded schematic view of the end cap assembly of FIG. 7;

fig. 9 is a schematic view of a battery according to an embodiment of the present application;

FIG. 10 is an exploded view of the battery shown in FIG. 9;

fig. 11 is a schematic structural diagram of an energy storage device according to an embodiment of the application.

Reference numerals:

the lower plastic (10) is made of a plastic material,

the lower plastic body 11, the first surface 11a, the second surface 11b, the first body 111, the second body 112,

a liquid injection through hole 114, a first pole through hole 115, a second pole through hole 116, a groove 117, a groove bottom wall 117a, a convex portion 118,

an explosion-proof net 12,

the ventilation holes 13, the first circular arc segment 131, the second circular arc segment 132, the first straight line segment 133, the second straight line segment 134,

the connecting portion 14 is provided with a connecting portion,

the first reinforcing portion 15, the first reinforcing rib 151, the second reinforcing rib 152, the first portion 152a, the second portion 152b, the third portion 152c,

The second reinforcing portion 16, the reinforcing ring 161, the reinforcing strip 162,

the first protrusion 17, the first protrusion body 171, the first deflector hole 172,

the second protrusion 18, the second protrusion body 181, the first extension 182, the first support 183, the second deflector hole 184,

the third protrusion 19, the third protrusion body 191, the second extension portion 192, the second support portion 193, the third guide hole 194,

the end cap assembly 100,

an end cover 20, an end cover body 21, an explosion-proof through hole 22, a liquid injection hole 23, a first pole hole 24, a second pole hole 25,

an explosion-proof valve 30, an explosion-proof valve body 31, a protection sheet 32,

the pole 40 is provided with a pair of slots,

the sealing ring 50 is provided with a sealing groove,

the plastic (60) is arranged on the upper part of the container,

battery 200, cell 110, housing 120, switch 130, first protective film 140, second protective film 150,

energy storage device 300, housing 310.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

For convenience of understanding, terms involved in the embodiments of the present application will be explained first. And/or: merely one association relationship describing the associated object, the representation may have three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. A plurality of: refers to two or more. And (3) connection: it is to be understood in a broad sense that, for example, a is linked to B either directly or indirectly via an intermediary.

The embodiment of the application provides lower plastic, which is used in an end cover assembly of a battery. The battery comprises an end cover assembly and a battery cell, wherein the end cover assembly is electrically connected with the battery cell to lead out the anode and the cathode of the battery. When the battery is a single battery, the battery can be a square single battery. The battery can be further applied to an energy storage device, and the energy storage device can include, but is not limited to, a battery module, a battery pack, a battery system and the like.

The following description of the embodiments of the present application will be made with reference to the accompanying drawings.

First embodiment:

referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a lower plastic 10 according to an embodiment of the application, and fig. 2 is a top view of the lower plastic 10 shown in fig. 1.

The lower plastic 10 comprises a lower plastic body 11, an explosion-proof net 12, two first protrusions 17, a second protrusion 18 and a third protrusion 19. The second bulge 18, the first bulge 17 and the third bulge 19 are arranged in sequence along the length direction X of the lower plastic body 11; along the width direction Y of the lower plastic body 11, two first protrusions 17 are disposed opposite to each other, and the explosion-proof net 12 is located between the two first protrusions 17 and connected to each first protrusion 17. The lower plastic body 11 has a first surface 11a and a second surface 11b which are oppositely arranged, and the explosion-proof net 12, the two first protrusions 17, the second protrusions 18 and the third protrusions 19 are all arranged in a protruding manner along the thickness direction Z of the lower plastic body 11.

The lower plastic body 11 has a rectangular plate-like structure. The lower plastic body 11 may be of an integral type or a split type structure. Illustratively, the lower plastic body 11 is a split structure. The lower plastic body 11 includes a first body 111 and a second body 112, and the first body 111 and the second body 112 are disposed at intervals along the length direction X of the lower plastic body 11. Through setting up plastic body 11 down for split type structure, can effectively avoid appearing deformation perk, shrink serious etc. when plastic 10 area is great down and influence structural strength's condition to structural strength and assembly efficiency under the improvement plastic 10.

The first body 111 is provided with a second protrusion 18, a liquid injection through hole 114 and a first pole through hole 115, the liquid injection through hole 114 and the first pole through hole 115 penetrate through the first body 111 along the thickness direction Z of the lower plastic body 11, the liquid injection through hole 114 is used for supplying power supply liquid to flow through, and the first pole through hole 115 is used for allowing a pole to pass through. The second body 112 is provided with a third protrusion 19 and a second post through hole 116, the second post through hole 116 penetrates the second body 112 along the thickness direction Z of the lower plastic body 11, and the second post through hole 116 is used for passing through a post. The first post through hole 115, the liquid injection through hole 114 and the second post through hole 116 are sequentially arranged along the length direction X of the lower plastic body 11 and are located between the second protrusion 18 and the third protrusion 19.

The explosion-proof net 12 has a substantially rectangular plate-like structure, and the explosion-proof net 12 includes an air vent 13, a connecting portion 14, a first reinforcing portion 15, and a second reinforcing portion 16. In this embodiment, the explosion-proof net 12 is located at one end of the second body 112 facing the first body 111 and is connected to the second body 112.

The air holes 13 are oval through holes, and the air holes 13 are arranged on the connecting part 14 and penetrate through the connecting part 14 along the thickness direction Z of the lower plastic body 11. The outer periphery of the ventilation hole 13 comprises a first circular arc section 131, a second circular arc section 132, a first straight line section 133 and a second straight line section 134, wherein the first circular arc section 131 and the second circular arc section 132 are oppositely arranged, the first straight line section 133 and the second straight line section 134 are oppositely connected, the first straight line section 133 is connected with one end of the first circular arc section 131 and one end of the second circular arc section 132, and the second straight line section 134 is connected with the other end of the first circular arc section 131 and the other end of the second circular arc section 132. In the present embodiment, the first straight line segment 133 and the second straight line segment 134 are arranged along the length direction X of the lower plastic body 11; along the width direction Y of the lower plastic body 11, the first arc segment 131 and the second arc segment 132 are arranged. The air holes 13 are used for exhausting the gas of the battery cell to the explosion-proof valve.

The connecting portion 14 surrounds the periphery of the ventilation hole 13 and is connected with the lower plastic body 11, the connecting portion 14 is arranged in a protruding mode relative to the second surface 11b of the lower plastic body 11, and the outline of the periphery of the connecting portion 14 is rectangular.

The first reinforcement 15 includes a first reinforcing rib 151. The first reinforcing rib 151 is of a strip structure, and is arranged on the connecting portion 14 in a protruding manner along the thickness direction Z of the lower plastic body 11, and the first reinforcing rib 151 is connected with the connecting portion 14 and at least partially covers the air holes 13. The extending direction of the first reinforcing rib 151 is the length direction X of the lower plastic body 11, i.e. the direction of the first straight line segment 133 towards the second straight line segment 134. The number of the first reinforcing ribs 151 may be plural, and the plural first reinforcing ribs 151 are disposed at intervals along the width direction Y of the lower plastic body 11. In this embodiment, the number of the first reinforcing ribs 151 is three, and the three first reinforcing ribs 151 are arranged at equal intervals along the width direction Y of the lower plastic body 11.

In order to ensure the gas flow area at the air vent 13, the air in the battery cell reaching a certain air pressure can be timely discharged to the explosion-proof valve by increasing the hole area of the air vent 13, but the structural strength of the connecting part 14 at the periphery of the air vent 13 is poor, especially the connecting part 14 at one side of the first straight line segment 133 of the air vent 13 far away from the second straight line segment 134, and the forming material of the connecting part 14 at the position is less to cause the corresponding structural strength to be poor. By arranging the first reinforcing ribs 151 on the air holes 13, the first reinforcing ribs 151 are connected with the connecting parts 14 positioned on two opposite sides of the air holes 13, on one hand, the deformation of the connecting parts 14 on the periphery of the air holes 13 during assembly or when the air pressure in the battery cell is large can be avoided, and the compressive strength and the deformation resistance of the connecting parts 14 on the periphery of the air holes 13 are greatly improved; on the other hand, after the first reinforcing ribs 151 are provided, in the case that the strength of the connecting portion 14 meets the use requirement, the thickness of the connecting portion 14 can be reduced, and then the protruding height of the explosion-proof net 12 relative to the second surface 11b can be reduced, so that more internal accommodating space is provided for the battery to accommodate the battery cells, and the volumetric energy density of the battery is improved. Through the part of the first reinforcing rib 151 covering the vent hole 13, a certain flow blocking and dividing effect can be achieved on the gas flowing to the vent hole 13, when the gas pressure in the battery is large, the gas is prevented from being concentrated in a short time and rushed to the explosion-proof valve from the vent hole 13, and the explosion-proof valve is completely separated from the battery under the action of high-pressure gas to cause splashing, so that the safety performance and the use reliability of the battery are improved.

The second reinforcement 16 includes a reinforcement ring 161 and a reinforcement bar 162. The reinforcing strip 162 is extended and connected to the connection portion 14. The reinforcing ring 161 has a waist-ring-shaped structure, and the outer peripheral shape of the reinforcing ring 161 is identical to the outer peripheral shape of the ventilation hole 13. In this embodiment, the number of the reinforcing rings 161 is plural, and the outer circumferences of the reinforcing rings 161 are different in size and smaller than the outer circumference of the ventilation holes 13. That is, along the thickness direction Z of the lower plastic body 11, the projection of the plurality of reinforcing rings 161 on the lower plastic body 11 falls within the projection of the ventilation holes 13 on the lower plastic body 11. A plurality of reinforcing rings 161 are disposed at equal intervals and connected by reinforcing bars 162. The reinforcing strips 162 are connected to the plurality of reinforcing rings 161 along the width direction Y of the lower plastic body 11. The extending direction of the reinforcing strip 162 is the width direction Y of the lower plastic body 11, and the ends of the reinforcing strip 162 are respectively connected with the connecting portions 14. The first reinforcing ribs 151 are disposed to protrude from the second reinforcing portion 16 along the thickness direction Z of the lower plastic body 11 and are at least partially connected to the second reinforcing portion 16. By providing the first reinforcing ribs 151 at least partially connected to the second reinforcing portion 16, the structural strength of the explosion-proof net 12 can be further improved, thereby better ensuring the safety performance and the use reliability of the battery.

Two first protrusions 17 are located at the end of the second body 112 and are spaced apart by the explosion-proof net 12. Along the extending direction of the second reinforcing rib 152, two first protrusions 17 are disposed at opposite sides of the connecting portion 14. Each first protrusion 17 is connected to the connecting portion 14 and is provided to protrude with respect to the connecting portion 14 in the thickness direction Z of the lower plastic body 11. The first protrusion 17 includes a first protrusion body 171 and a first deflector hole 172 provided on the first protrusion body 171, the first deflector hole 172 penetrating the first protrusion body 171 in a thickness direction Z of the lower plastic body 11. The number of the first guide holes 172 is plural, the plural first guide holes 172 are arranged at intervals, and the first guide holes 172 are used for flowing the electrolyte.

Referring to fig. 3 and 4, fig. 3 is a schematic view illustrating an angle of the lower plastic 10 shown in fig. 1, and fig. 4 is a schematic view illustrating a cross section of the lower plastic 10 along A-A shown in fig. 1.

Referring to fig. 3, the second body 112 is provided with a groove 117, the groove 117 is disposed at one end of the second body 112 away from the third protrusion 19, the groove 117 is formed by recessing a portion of the second body 112 along the first surface 11a toward the second surface 11b of the lower plastic body 11, and the explosion-proof net 12 is disposed in the groove 117 and protrudes along the thickness direction Z of the lower plastic body 11 relative to the bottom wall 117a of the groove 117. That is, with respect to the first surface 11a of the lower plastic body 11, both sides of the explosion-proof net 12 have a greater recess depth than the explosion-proof net 12, and both sides of the explosion-proof net 12 are recessed into two sub-grooves (not shown). Along the width direction Y of the lower plastic body 11, the explosion-proof net 12 is positioned between the two sub-grooves, and the explosion-proof net 12 is arranged in a protruding manner relative to the bottom walls of the two sub-grooves along the thickness direction Z of the lower plastic body 11. On both sides of the explosion-proof net 12, the positions of the two first protrusions 17 protruding relative to the second surface 11b of the lower plastic body 11 correspond to the positions of the two sub-grooves recessed relative to the first surface 11a of the lower plastic body 11, and the bottom wall of the sub-groove is a surface of the first protrusion body 171. By providing the explosion-proof net 12 with the recess depth greater than that of the explosion-proof net 12 on both sides and providing the first guide holes 172 on the first protrusion bodies 171 on both sides of the explosion-proof net 12, the electrolyte can flow into the battery from the first guide holes 172 without converging on the air holes 13 of the explosion-proof net 12, and the injection speed of the electrolyte can be improved to further improve the manufacturing efficiency of the battery.

In this embodiment, the lower plastic body 11 may further be provided with a protrusion 118, and along the thickness direction Z of the lower plastic body 11, the protrusion 118 is protruded with respect to the first surface 11a of the lower plastic body 11, and the protrusion 118 is used for enhancing the contact area between the lower plastic body 11 and the end cover, so as to improve the assembly strength of the lower plastic 10 and the end cover.

Referring to fig. 4, the protruding height H2 of the first protrusion 17 relative to the connecting portion 14 is greater than or equal to the protruding height H1 of the first stiffener 151 relative to the connecting portion 14. Further, the protruding height H2 of the first protrusion 17 with respect to the connection portion 14 is equal to the protruding height H1 of the first reinforcing rib 151 with respect to the connection portion 14. Through setting up the protrusion height H2 of first arch 17 for connecting portion 14 and being greater than or equal to the protrusion height H1 of first strengthening rib 151 relative to connecting portion 14, both can guarantee that explosion-proof net 12 is equipped with one side of first strengthening rib 151 and be difficult to receive the extrusion, and then guarantee the structural strength of explosion-proof net 12, can play certain spacing supporting role to the electric core through the first arch 17 of explosion-proof net 12 both sides again, avoid first strengthening rib 151 to insert electric core terminal surface and lead to electric core tip fold or pole piece short circuit, guarantee the security performance of battery. Through the protrusion height H2 of the first protrusion 17 relative to the connecting portion 14 is equal to the protrusion height H1 of the first reinforcing rib 151 relative to the connecting portion 14, the first protrusion 17 and the first reinforcing rib 151 can play a certain limiting supporting role on the battery cell on the same plane, the limiting supporting strength of the lower plastic 10 on the battery cell is ensured, and the use reliability of the battery is further improved.

Referring to fig. 1 and 2, the second protrusion 18 has a strip-shaped structure, and the second protrusion 18 includes a second protrusion body 181, a first extension 182, and a first support 183. The second protrusion body 181 is provided with a second guide hole 184, and the second guide hole 184 penetrates the first protrusion body 171 along the thickness direction Z of the lower plastic body 11, and the second guide hole 184 allows the electrolyte to flow therethrough. The first extension portion 182 is a plate-shaped structure, the first extension portion 182 is disposed at one end of the second protrusion body 181 away from the first body 111, the first extension portion 182 is disposed by extending a portion of the outer periphery of the second protrusion 18 along the thickness direction Z of the lower plastic body 11 relative to the second protrusion 18, and the first extension portion 182 is used for the hot-melting connection between the lower plastic 10 and the battery cell insulating film.

The third protrusion 19 has a strip structure, and the third protrusion 19 includes a third protrusion body 191, a second extension portion 192, and a first support portion 183. The third protrusion body 191 is provided with a third guide hole 194, the third guide hole 194 penetrates the first protrusion body 171 along the thickness direction Z of the lower plastic body 11, and the third guide hole 194 allows the electrolyte to flow therethrough. The second extending portion 192 is a plate-shaped structure, the second extending portion 192 is disposed at one end of the third protruding body 191 away from the first body 111, the second extending portion 192 is disposed by extending a portion of the outer periphery of the third protrusion 19 along the thickness direction Z of the lower plastic body 11 relative to the third protrusion 19, and the second extending portion 192 is used for hot-melting connection between the lower plastic 10 and the battery cell insulating film. In the present embodiment, the first extension 182 and the second extension 192 have the same structure.

In the existing battery manufacturing process, in order to ensure the insulation performance of the battery, a battery core insulation film is generally arranged in the battery, the battery core insulation film wraps the bottom surface and the side surface of the battery core and is positioned between the battery shell and the battery core, the battery core insulation film is wrapped on the bottom surface and the side surface of the battery core, the battery core insulation film is added to form a containing cavity, the containing cavity is provided with an opening facing the end cover assembly, and the connection between the battery core insulation film and the end cover assembly is realized through at least partial hot melting of the lower plastic edge and the battery core. By arranging the first extension part 182 on the second bulge 18 and arranging the second extension part 192 on the third bulge 19, on one hand, the hot melting area of the lower plastic 10 and the battery cell insulating film can be further increased, so that the connection effect of the lower plastic 10 and the battery cell insulating film is improved, and the safety performance and the use reliability of the battery are further ensured; on the other hand, under the condition that the thermal melting area of the lower plastic 10 and the battery cell insulating film meets the use requirement, the protruding height of the second protrusion 18 relative to the second surface 11b can be reduced, the weight of the lower plastic 10 is reduced, more accommodating space is provided for accommodating the battery cell for the inside of the battery, and therefore the volume energy density and the energy density of the battery are improved. In this embodiment, the first extension portion 182 and the second extension portion 192 are disposed opposite to each other, the first extension portion 182 is located at a center line position of the second protrusion 18 along the width direction Y of the lower plastic body 11, and the second extension portion 192 is located at a center line position of the third protrusion 19 along the width direction Y of the lower plastic body 11 (see fig. 10), so as to ensure uniformity of the connection strength between the lower plastic 10 and the battery cell insulating film. When n (n is an integer and n > 1) cells are included in the battery, the number of the first extension 182 and the second extension 192 may be n-1. When the battery is assembled, each first extension 182 and each second extension 192 are located between two adjacent battery cells along the width direction Y of the lower plastic body 11.

The first supporting portion 183 is located at a side of the first extending portion 182 near the first protrusion 17, one end of the first supporting portion 183 is connected to the first extending portion 182, the other end of the first supporting portion 183 is connected to the second protrusion 18, and the first supporting portion 183 is used for supporting the first extending portion 182. The height of the first supporting portion 183 is smaller than the height of the first extending portion 182. Along the direction of the first supporting portion 183 toward the second protrusion 18, the cross-sectional area of the first supporting portion 183 along the length direction X of the lower plastic body 11 gradually increases; along the direction of the first support portion 183 toward the first extension portion 182, the longitudinal sectional area of the first support portion 183 along the thickness direction Y of the lower plastic body 11 gradually increases.

The second supporting portion 193 is located on one side of the second extending portion 192 near the first protrusion 17, one end of the second supporting portion 193 is connected to the second extending portion 192, the other end of the second supporting portion 193 is connected to the third protrusion 19, and the second supporting portion 193 is used for supporting the second extending portion 192. In the present embodiment, the second supporting portion 193 and the first supporting portion 183 are identical in structure. Referring to fig. 4, the height H4 of the second supporting portion 193 is smaller than the height H3 of the second extending portion 192. Along the direction of the second supporting portion 193 toward the third protrusion 19, the cross-sectional area of the second supporting portion 193 along the length direction X of the lower plastic body 11 gradually increases; along the direction of the second supporting portion 193 toward the second extending portion 192, the longitudinal sectional area of the second supporting portion 193 along the thickness direction Y of the lower plastic body 11 gradually increases.

Along the length direction X of the lower plastic body 11, relative to the first extension part 182 and the second extension part 192, the first support part 183 and the second support part 193 are closer to the middle line position of the length of the lower plastic body 11, and the height of the first support part 183 is smaller than that of the first extension part 182, and the height of the second support part 193 is smaller than that of the second extension part 192, so that after the battery is assembled, the first support part 183 and the second support part 193 can be prevented from abutting against the battery core in the battery, and under the condition that the supporting effect meets the use requirement, the space occupation of the support part in the height direction of the battery is reduced, the weight of the lower plastic 10 is lightened, and more accommodating spaces are provided for the inside of the battery to be used for accommodating the battery, thereby improving the volume energy density and the energy density of the battery. By providing the direction along the second supporting portion 193 toward the third protrusion 19, the cross-sectional area of the second supporting portion 193 increases gradually along the length direction X of the lower plastic body 11; along the direction of the second supporting portion 193 towards the second extending portion 192, the longitudinal cross section area of the second supporting portion 193 along the thickness direction Y of the lower plastic body 11 is gradually increased, so that the contact area between the first supporting portion 183 and the first extending portion 182 and the second protrusion 18, and the contact area between the second supporting portion 193 and the second extending portion 192 and the third protrusion 19 can be further increased, the supporting strength and the connecting strength of the first supporting portion 183 and the second supporting portion 193 are improved, and further the structural strength and the use reliability of the lower plastic 10 are guaranteed.

Second embodiment:

referring to fig. 5 and 6, fig. 5 is a schematic structural diagram of a lower plastic 10 according to another embodiment of the present application, and fig. 6 is a top view of the lower plastic 10 shown in fig. 5.

In this embodiment, the same contents as those of the first embodiment will not be described again, and the difference from the first embodiment is that the first reinforcement portion 15 further includes the second reinforcement rib 152.

The second reinforcing rib 152 has a substantially elongated structure. Along the thickness direction Z of the lower plastic body 11, the second reinforcing ribs 152 are protruding on the connecting portion 14, and the second reinforcing ribs 152 are connected with the connecting portion 14 and at least partially cover the ventilation holes 13. The extending direction of the second reinforcing rib 152 intersects with the extending direction of the first reinforcing rib 151. Further, in the present embodiment, the second reinforcing ribs 152 are disposed perpendicular to the first reinforcing ribs 151.

By providing the second reinforcing ribs 152, the extending direction of the second reinforcing ribs 152 intersects with the extending direction of the first reinforcing ribs 151, on the one hand, the connection portion 14 at the outer periphery of the ventilation holes 13 and the second reinforcing portion 16 in the ventilation holes 13 can be provided with a structural strength reinforcing position and supporting force different from those of the first reinforcing ribs 151, so that the compressive strength and the deformation resistance of the explosion-proof net 12 can be further improved. On the other hand, in the case where the strength of the connection portion 14 meets the use requirement after the first reinforcing rib 151 and the second reinforcing rib 152 are provided, the thickness of the connection portion 14 may be further reduced, so that the protruding height of the explosion-proof net 12 with respect to the second surface 11b is further reduced, and further, more accommodation space is provided for accommodating the battery cell inside, so that the volumetric energy density of the battery is further improved. Through setting up perpendicularly of second strengthening rib 152 and first strengthening rib 151, can make two adjacent first strengthening ribs 151 and partial second strengthening rib 152 constitute "worker" font structure, when receiving the effort along the length direction X of lower plastic body 11 or along the width direction Y of lower plastic body 11, first strengthening rib 151 and second strengthening rib 152 can rely on each other in order to disperse the atress, and then further improve compressive strength and the anti deformation strength of connecting portion 14 of bleeder vent 13 periphery and the second strengthening portion 16 in the bleeder vent 13 to guarantee the structural strength and the reliability of use of explosion-proof net 12 better.

The second reinforcing rib 152 includes at least one first portion 152a, two second portions 152b, and two third portions 152c. Referring to fig. 6, in the present embodiment, the number of the first reinforcing ribs 151 is three, the number of the second reinforcing ribs 152 is one, and the second reinforcing ribs 152 include two first portions 152a, two second portions 152b, and two third portions 152c. The third portion 152c, the second portion 152b, the first reinforcing rib 151, and the first portion 152a are sequentially arranged along the width direction Y of the lower plastic body 11. Each first portion 152a is connected between two adjacent first reinforcing ribs 151, one second portion 152b is located at one side of the three first reinforcing ribs 151, the other second portion 152b is located at the other side of the three first reinforcing ribs 151, and each third portion 152c is connected to one end of the second portion 152b remote from the first reinforcing ribs 151. That is, the second portion 152b is located between the first reinforcing rib 151 and the first protrusion 17 in the width direction Y of the lower plastic body 11. One end of the second portion 152b is connected to the first connection rib closest to the first protrusion 17, and the other end of the second portion 152b is connected to the third portion 152c.

The outer side of the second portion 152b is an arc surface. That is, at the junction where the second portion 152b connects the third portion 152c and the first reinforcing bead 151, the third portion 152c and the first reinforcing bead 151 are transited by an arc surface. The draft angle of the second portion 152b is less than or equal to 45 °. Through setting the outer side surface of the second portion 152b to be an arc surface, the draft angle of the second portion 152b is smaller than or equal to 45 degrees, so that the condition that the second portion 152b is at a right angle at the joint of the third portion 152c and the first reinforcing rib 151 so as to cause unfilled corners during injection molding and demolding can be avoided, and the condition that breakage occurs during demolding is avoided through setting the draft angle, so that the injection molding efficiency and the yield of the lower plastic 10 are ensured.

In the second reinforcing rib 152 along the length direction X of the lower plastic body 11, the width D1 of the first portion 152a is greater than the width D3 of the third portion 152c, and the maximum width D2 of the second portion 152b is greater than or equal to the width D3 of the third portion 152 c. In the present embodiment, the maximum width D2 of the second portion 152b is greater than the width D3 of the third portion 152c, and the maximum width D2 of the second portion 152b is greater than the width D1 of the first portion 152a, i.e. D3 < D1 < D2 is satisfied. By setting the width D1 of the first portion 152a to be greater than the width D3 of the third portion 152c, the width of the first portion 152a between two adjacent first reinforcing ribs 151 is increased, so that the structural strength of the first reinforcing ribs 151 and the second reinforcing ribs 152 after forming an i-shaped structure can be further enhanced, and the structural supporting strength of the central region of the explosion-proof net 12 can be also enhanced, thereby further ensuring the structural strength and the use reliability of the explosion-proof net 12. By setting the maximum width D2 of the second portion 152b to be greater than or equal to the width D3 of the third portion 152c, on the one hand, the structural strength at the intersection of the first reinforcing rib 151 and the third portion 152c can be ensured, thereby ensuring the structural strength and the reliability in use of the explosion-proof net 12; on the other hand, the ventilation area of the ventilation holes 13 of the explosion-proof net 12 between the first reinforcing ribs 151 and the first protrusions 17 can be ensured, when the battery reaches a certain air pressure and temperature, the second reinforcing parts 16 between the first reinforcing ribs 151 and the first protrusions 17 are fused to further increase the exhaust area of the explosion-proof net 12, and the timely exhaust of the gas in the battery is ensured, so that the safety performance and the use reliability of the battery are ensured.

Referring to fig. 7 and 8, fig. 7 is a schematic structural view of an end cap assembly 100 according to an embodiment of the present application, and fig. 8 is an exploded schematic view of the end cap assembly 100 shown in fig. 7.

The end cover assembly 100 comprises a lower plastic 10, an end cover 20, an explosion-proof valve 30, a pole column 40, a sealing ring 50 and an upper plastic 60, wherein the lower plastic 10 and the end cover 20 are stacked, the sealing ring 50 is sleeved on the pole column 40 and penetrates through the lower plastic 10 and the end cover 20 to be led out as an electrode of a battery, the upper plastic 60 is positioned on one side of the end cover 20 far away from the lower plastic 10, the upper plastic 60 insulates the outer side surface of one end of the pole column 40 penetrating out of the end cover 20, and the explosion-proof valve 30 is arranged on the end cover 20 and is used for pressure relief protection when the battery reaches a certain pressure.

The end cap 20 comprises an end cap body 21, and an explosion-proof through hole 22, a liquid injection hole 23, a first pole hole 24 and a second pole hole 25 which are arranged on the end cap body 21. The explosion-proof through hole 22 is used for connecting an explosion-proof valve 30, the liquid injection hole 23 is used for injecting electrolyte into a battery, and the first pole hole 24 and the second pole hole 25 are used for allowing the pole 40 to pass through. The side of the end cover body 21 facing the lower plastic 10 is further provided with a concave portion, and the concave portion is used for being matched with the convex portion 118 of the lower plastic 10 to increase the contact area between the end cover 20 and the lower plastic 10, so that the connection strength between the end cover 20 and the lower plastic 10 is improved, and the assembly strength of the end cover assembly 100 is ensured.

The explosion-proof valve 30 includes an explosion-proof valve body 31 and a protection sheet 32, the explosion-proof valve body 31 and the protection sheet 32 being stacked, the protection sheet 32 being for preventing the explosion-proof valve body 31 from being disturbed by the external environment.

Referring to fig. 9 and 10, fig. 9 is a schematic structural view of a battery 200 according to an embodiment of the application, and fig. 10 is an exploded schematic view of the battery 200 shown in fig. 9.

The battery 200 provided in the embodiment of the application includes: the end cap assembly 100, the battery cell 110, the adapter piece 130 and the housing 120, and the electrical connection between the battery cell 110 and the end cap assembly 100 is achieved through the adapter piece 130. The surface of the housing 120 may be further adhered with a first protection film 140, where the battery cell 110 is located inside the housing 120, and the battery cell is protected by the housing 120 and the first protection film 140 from the external environment. The cell 110 is further provided with a second protective film 150 outside, the second protective film 150 is located between the housing 120 and the cell 110, the cell 110 is located inside the second protective film 150, the second protective film 150 wraps the bottom surface and the side surface of the cell 110, and the second protective film 150 faces one end of the end cover assembly 100 and is in hot melting connection with at least part of the lower plastic 10. Specifically, the second protective film 150 is thermally fused to at least part of the outer sides of the first protrusion 17, the second protrusion 18, and the third protrusion 19, and the first extension 182 and the second extension 192 of the lower plastic 10.

Wherein the battery 200 is a secondary battery. Such as nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead-storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, and the like. In other embodiments, the battery 200 may also be a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, or a sodium ion battery, or a magnesium ion battery, etc. The battery 200 may be rectangular, cylindrical, or other shape. In the embodiment of the present application, the battery 200 is a rectangular parallelepiped.

It should be understood that the battery 200 described in the examples of the present application is only one form of the battery 200 to which the end cap assembly is applied, and should not be construed as limiting the battery 200 provided by the present application or the end cap assembly 100 provided by the various embodiments of the present application.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an energy storage device 300 according to an embodiment of the application. The energy storage device 300 provided in the embodiment of the application includes: the housing 310 and the plurality of batteries 200 are electrically connected and each of the plurality of batteries 200 is located inside the housing 310, which can be protected from the external environment by the housing 310. In this embodiment, one energy storage device 300 includes a plurality of batteries 200. The plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 may be connected in series, or in parallel, or a mixture of series and parallel to achieve a larger capacity and power.

It should be understood that the energy storage device 300 described in the embodiments of the present application is only one form of the energy storage device 300 to which the battery 200 is applied, and should not be construed as limiting the energy storage device 300 provided in the embodiments of the present application or as limiting the battery 200 provided in the various embodiments of the present application.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A lower plastic, comprising: the anti-explosion net comprises an air hole, a connecting portion and a first reinforcing portion, wherein the air hole is formed in the connecting portion, the air hole penetrates through the connecting portion in the thickness direction of the lower plastic body, the connecting portion surrounds the periphery of the air hole and is connected with the lower plastic body, the first reinforcing portion is arranged on the connecting portion in a protruding mode in the thickness direction of the lower plastic body, and the first reinforcing portion partially covers the air hole.

2. The lower plastic according to claim 1, wherein the outer periphery of the ventilation hole comprises a first arc section, a second arc section, a first straight line section and a second straight line section, the first arc section and the second arc section are oppositely arranged, the first straight line section is connected with one end of the first arc section and one end of the second arc section, and the second straight line section is connected with the other end of the first arc section and the other end of the second arc section;

the first reinforcing part comprises a first reinforcing rib, the extending direction of the first reinforcing rib is the direction of the first straight line section towards the second straight line section, and the first reinforcing rib at least partially covers the air holes.

3. The lower plastic of claim 2, wherein the first reinforcement further comprises a second reinforcement rib, the second reinforcement rib extending in a direction intersecting the first reinforcement rib extending in a direction, the second reinforcement rib being connected to the first reinforcement rib, the second reinforcement rib at least partially covering the vent.

4. The lower plastic according to claim 3, wherein the first reinforcing ribs are perpendicular to the second reinforcing ribs, the number of the first reinforcing ribs is plural, and the plural first reinforcing ribs are arranged at intervals along the direction of the first arc section towards the second arc section;

The second reinforcing rib comprises at least one first part, two second parts and two third parts, wherein each first part is connected between two adjacent first reinforcing ribs, one second part is positioned on one side of each first reinforcing rib, the other second part is positioned on the other side of each first reinforcing rib, each third part is connected with one end, far away from each first reinforcing rib, of each second part, one third part, one second part, one first reinforcing rib and one first part are sequentially connected along the extending direction of each second reinforcing rib, the width of each first part is larger than that of each third part, and the maximum width of each second part is larger than or equal to that of each third part.

5. The lower plastic according to claim 4, wherein the lower plastic body further comprises two first protrusions, the two first protrusions are disposed on the lower plastic body, and the two first protrusions are disposed on opposite sides of the connecting portion along the extending direction of the second reinforcing rib;

each first bulge is connected with the connecting part and protrudes from the connecting part along the thickness direction of the lower plastic body, the second reinforcing rib is connected with the first bulge, and the protruding height of the first bulge relative to the connecting part is larger than or equal to that of the first reinforcing rib relative to the connecting part.

6. The lower plastic according to claim 5, wherein a second protrusion is provided at one end of the lower plastic body along the extending direction of the first reinforcing rib, a third protrusion is further provided at the other end of the lower plastic body along the thickness direction of the lower plastic body, the second protrusion and the third protrusion are each provided to protrude from the lower plastic body along the extending direction of the first reinforcing rib, the second protrusion, the first protrusion, the third protrusion are arranged, the second protrusion is further provided with a first extension portion extending from a part of the outer periphery of the second protrusion along the thickness direction of the lower plastic body with respect to the second protrusion, and/or the third protrusion is further provided with a second extension portion extending from a part of the outer periphery of the third protrusion along the thickness direction of the lower plastic body with respect to the third protrusion.

7. The lower plastic according to claim 6, wherein the first extension part further comprises a first support part, the first support part is located at one side of the first extension part near the first protrusion, one end of the first support part is connected with the first extension part, the other end of the first support part is connected with the second protrusion, and the height of the first support part is smaller than the height of the first extension part along the thickness direction of the lower plastic body; and/or, the second extending part further comprises a second supporting part, the second supporting part is positioned at one side of the second extending part, which is close to the first protrusion, one end of the second supporting part is connected with the second extending part, the other end of the second supporting part is connected with the third protrusion, and the height of the second supporting part is smaller than that of the second extending part along the thickness direction of the lower plastic body.

8. An end cover assembly, characterized in that, including end cover, explosion-proof valve and any one of claims 1-7 lower plastic, the end cover with lower plastic range upon range of setting, the end cover includes end cover body and explosion-proof through-hole, explosion-proof through-hole is followed the thickness direction of end cover body runs through the end cover body, explosion-proof valve is located explosion-proof through-hole and with explosion-proof through-hole's pore wall is connected, the bleeder vent with explosion-proof through-hole intercommunication sets up, first reinforcing part is located the bleeder vent deviates from one side of explosion-proof through-hole.

9. A battery comprising a housing, a battery cell and the end cap assembly of claim 8, wherein the battery cell is disposed within the housing, the end cap assembly is mated with the housing to seal the battery cell, and the end cap assembly is electrically connected to the battery cell.

10. An energy storage device comprising a housing and a plurality of the cells of claim 9, wherein the plurality of cells are electrically connected in a manner comprising at least one of series and parallel.