CN115832548A - End cover assembly, battery monomer, battery and power consumption device - Google Patents

Abstract

The invention discloses an end cover assembly, a battery monomer, a battery and an electric device. Wherein the end cap member is provided with vent holes which penetrate through two opposite sides of the end cap member; the explosion-proof valve is arranged on the end cover part and seals the exhaust hole; the insulating part with the explosion-proof valve is the range upon range of setting, just the insulating part is in corresponding the position of exhaust hole is equipped with the hole of unloading, the area in hole of unloading is greater than or equal to the area in exhaust hole. The technical scheme of the invention can reduce the possibility of discharging high-temperature splashed materials in the battery, thereby reducing the occurrence of fire and explosion accidents of the battery and improving the use safety of the battery.

Description

End cover assembly, battery cell, battery and electrical device

technical field

The invention relates to the technical field of batteries, in particular to an end cap assembly, a battery cell, a battery and an electrical device.

Background technique

Usually, the cause of battery safety problems is thermal runaway, that is, as the temperature continues to rise, various reactions occur inside the battery, such as: SEI decomposition, reduction reaction between the anode and the electrolyte, oxidation reaction between the cathode and the electrolyte, and electrolyte It evaporates and decomposes when heated. Various reactions lead to a continuous rise in battery temperature accompanied by a large amount of gas generation, which in turn causes a sharp increase in the internal pressure of the battery. Therefore, in order to prevent the battery from exploding due to a sharp increase in internal pressure, an explosion-proof valve is usually installed on the top cover assembly of some batteries, so that when the internal pressure of the battery rises sharply, the high-temperature gas in the battery can be discharged from the explosion-proof valve. Come out for decompression.

However, the top cover assembly in this type of battery usually includes a top cover plate and a plastic plate arranged in layers, and an explosion-proof valve is installed on the side of the top cover plate away from the plastic plate. In this way, when the high-temperature gas is discharged from the explosion-proof valve, the area of the plastic plate corresponding to the explosion-proof valve will be melted by the high-temperature gas and follow the gas discharge to form high-temperature splashes. At this time, the high-temperature spatter is still prone to spontaneous combustion after it is discharged to the outside of the battery and comes into contact with air, which in turn leads to battery fire and explosion accidents. Therefore, there are still certain potential safety hazards when using this type of battery.

Contents of the invention

The main purpose of the present invention is to provide an end cover assembly, aiming at improving the safety of battery use.

To achieve the above object, the end cap assembly proposed by the present invention includes:

an end cap, the end cap is provided with a vent, and the vent runs through opposite sides of the end cap;

an explosion-proof valve, the explosion-proof valve is arranged on the end cover and seals the exhaust hole; and

Insulator, the insulator and the end cover are stacked, and the insulator is provided with a material removal hole at a position corresponding to the exhaust hole, and the area of the material removal hole is greater than or equal to that of the row The area of the stomata.

When the end cap assembly in this solution is applied to a battery, it can cover the opening of the casing, so as to isolate and protect the electrode assembly located in the casing. Moreover, it is particularly important that when the thermal runaway of the battery causes the high-temperature gas in the battery to be discharged through the explosion-proof valve arranged in the vent hole for pressure relief, since the insulator in the end cap assembly is at the position corresponding to the vent hole There is a material removal hole. When the exhaust direction of the exhaust hole is defined as the direction from bottom to top, it can also be said that the material removal hole is formed at the position below the explosion-proof valve, and the area of the material removal hole is greater than or equal to The area of the vent hole, so that the high-temperature gas in the battery can pass through the discharge hole more smoothly, and can better avoid the high temperature of the insulator similar to the end cap assembly in the prior art in the area corresponding to the explosion-proof valve. The phenomenon that gas melts and follows the gas discharge to form high-temperature spatter. Therefore, the structural arrangement of the end cap assembly in this solution can reduce the possibility of high-temperature splashing and discharge in the battery, thereby reducing the occurrence of battery fire and explosion accidents, thereby improving the safety of battery use.

In an embodiment of the present invention, the end cover assembly further includes a barrier, which is arranged on the end cover and is opposite to the explosion-proof valve, and the barrier is also provided with multiple an air hole.

At this time, the setting of the barrier can further block the high-temperature splashes that may be included in the high-temperature gas, so as to prevent the battery from igniting spontaneously after being discharged from the battery and causing the battery to catch fire and explode.

In an embodiment of the present invention, the barrier member and the explosion-proof valve are sequentially distributed along the exhaust direction of the exhaust hole.

At this time, the high-temperature gas first passes through the barrier and then through the explosion-proof valve, so that it can pass through the barrier earlier on the flow path of the airflow to block the high-temperature splash mixed with the high-temperature gas, which is conducive to improving the high-temperature spray. The effect of spatter blocking inside the battery.

In an embodiment of the present invention, the barrier member is disposed in the vent hole.

At this time, directly disposing the barrier in the exhaust hole can make the barrier more compact, and can fully and effectively block high-temperature splashes that may be included in the high-temperature gas passing through the exhaust hole.

In an embodiment of the present invention, the barrier member and the end cover member are provided in an integral structure.

At this time, the barrier member and the end cover member can be formed as a whole during molding, and there is no need to assemble and connect the barrier member and the end cover member later, which is beneficial to improve the manufacturing efficiency of the end cover assembly. convenience. At the same time, such setting can also improve the connection strength between the two.

In an embodiment of the present invention, the barrier member is arranged on the side of the end cover facing the insulating member, and is located in the material removal hole, and the barrier member is also connected to the material removal hole. The walls of the holes are arranged at intervals.

At this time, it is convenient to arrange the barrier member and the end cover member separately, so that the barrier member can be independently manufactured and adapted to use scenarios with vent holes of different sizes. At the same time, the barrier is placed in the material removal hole, and is spaced from the hole wall of the material removal hole, so that the end cover and the insulating part can be arranged more compactly, and the barrier will not touch after absorbing high temperature to the insulation and melt it.

In an embodiment of the present invention, the barrier member and the end cover member are fixed by welding.

At this time, the barrier and the end cover are fixed by welding, so that there is no need to provide a connecting structure on the barrier and the end cover, which is beneficial to protect the structures of the barrier and the end cover themselves. At the same time, fixing by welding can also improve the connection strength between the two.

In an embodiment of the present invention, an insulating layer is provided on a side of the barrier member away from the explosion-proof valve.

At this time, the insulating layer can also play an insulating role on the barrier, reducing battery leakage and short circuit accidents, so as to further improve the safety of battery use.

In an embodiment of the present invention, the diameter of each of the air holes is greater than or equal to 0.1mm and less than or equal to 3mm;

And/or, the shape and size of each of the air holes are the same;

And/or, a plurality of the air holes are evenly spaced on the barrier member.

At this time, setting the diameter of the air hole between 0.1mm and 3mm can take into account the exhaust efficiency at this place, and at the same time, it is better to block some high-temperature splashes mixed in the airflow. And setting the shape and size of each air hole to be the same can make the shape and structure of the barrier member very regular and simple, which is conducive to improving the convenience of processing and molding. The plurality of air holes are distributed evenly at intervals, which can also make the shape and structure of the barrier member very regular and simple, which is also conducive to improving the convenience of processing and forming.

In one embodiment of the present invention, the explosion-proof valve and the end cover are arranged in an integrated structure;

And/or, both the end cap and the insulation are plate-shaped.

At this time, the explosion-proof valve and the end cover are provided as an integrated structure, so that the connection strength between the two can be enhanced, so that the explosion-proof valve can work normally and stably. And most importantly, such setting can better ensure the sealing effect of the explosion-proof valve on the exhaust hole on the end cover. However, if the end cover and the insulator are arranged in a plate structure, the structure of the end cover and the insulator can be relatively regular, which is beneficial to improve the convenience of battery processing and molding.

The present invention also proposes a battery cell, including a casing, an end cap assembly and an electrode assembly, an opening is formed at one end of the casing, the casing is arranged in the bottom case, and the end cap assembly is closed. For the opening of the bottom case, the end cover assembly is the end cover assembly in any of the solutions above, and the insulating part in the end cover assembly faces the electrode assembly.

The present invention also proposes a battery, including a box body and a battery cell arranged in the box body, and the battery cell is the above-mentioned battery cell.

The present invention also proposes an electrical device, which includes a device body and a battery disposed on the device body, and the battery is the above battery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

FIG. 1 is a schematic structural view of an embodiment of a battery cell of the present invention;

Fig. 2 is a schematic diagram of an explosion structure of the battery cell in Fig. 1;

3 is a schematic structural view of an embodiment of an end cap assembly of the present invention;

Fig. 4 is a structural schematic view of another perspective of the end cap assembly in Fig. 3;

Fig. 5 is a schematic diagram of an exploded structure of the end cap assembly in Fig. 3;

Fig. 6 is a schematic diagram of an exploded structure of the barrier and the insulating plate of the end cap assembly in Fig. 5;

7 is a schematic structural view of another embodiment of the end cap assembly of the present invention;

FIG. 8 is a schematic diagram of an exploded structure of the end cap assembly in FIG. 7 .

Explanation of reference numbers:

label name label name 100 battery cell 14 Barrier 10 End cap assembly 141 Air hole 11 top cover 15 Insulation 111 Vent 16 Conductive pole 12 Explosion-proof valve 17 Injection hole 13 plastic sheet 30 Bottom case 131 Removal hole 50 Electrode assembly

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the descriptions involving "first", "second" and so on in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B as an example", including scheme A, scheme B, or schemes satisfying both A and B. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The applicant noticed that the end cover assembly of the battery in the related art usually includes a top cover plate and a plastic plate in a stacked arrangement, and an explosion-proof valve is installed on the side of the top cover plate away from the plastic plate, so that when the internal pressure of the battery is sharp When rising, the high-temperature gas in the battery can be discharged from the explosion-proof valve for pressure relief. At this time, it is possible to avoid explosion accidents caused by excessive internal pressure of the battery. However, when the high-temperature gas is discharged from the explosion-proof valve, the area of the plastic plate corresponding to the explosion-proof valve will be melted by the high-temperature gas and follow the gas discharge to form high-temperature splashes. At this time, the high-temperature spatter is still prone to spontaneous combustion after being discharged to the outside of the battery and contacts the air, which will cause the battery to catch fire and explode, making this type of battery still have certain safety hazards during use.

Based on the above considerations, in order to solve the problem that the battery in the related art is likely to cause fire and explosion accidents due to the discharge of high-temperature splashes, please refer to Figures 1 to 5, the applicant has designed a battery cell 100 The end cap assembly 10. In an embodiment of the present invention, the end cover assembly 10 includes an end cover 11 , an explosion-proof valve 12 and an insulating member 13 . The end cover 11 is provided with an exhaust hole 111, and the exhaust hole 111 runs through the opposite sides of the end cover 11; the explosion-proof valve 12 is arranged on the end cover 11, and seals the exhaust hole 111; the insulating member 13 and the end cover 11 The insulator 13 is arranged in layers, and the insulating member 13 is provided with a material removal hole 131 at a position corresponding to the exhaust hole 111 , and the area of the material removal hole 131 is greater than or equal to the area of the exhaust hole 111 .

The end cover 11 can be used to cover the battery cell 100 (constructed by the casing 30, the electrode assembly 50 and the electrolyte arranged in the casing 30, the electrode assembly 50 can be a laminated electrode assembly 50, or It may be an opening on the housing 30 of the wound electrode assembly 50) (the opening may be provided on the upper surface of the housing 30 or other side surfaces), so as to play a role in the electrode assembly 50 located in the housing 30 Sealing effect. Wherein, the material of the end cover 11 can be made of metal, so as to enhance the strength of the top plate and improve the service life, and at the same time, it can better protect the electrode assembly 50 located in the casing 30 . Of course, the present application is not limited thereto, and in other embodiments, the material of the end cover 11 may also be plastic or ceramics. In addition, the end cover 11 can be arranged in a plate-like structure, so that its shape is relatively regular and easy to process and shape, so as to improve the convenience of battery manufacturing. At this time, the shape of the end cover 11 can be rectangular, square or other shapes, etc., specifically, it can be adaptively set according to the shape of the opening on the housing 30, so as to ensure that the opening on the housing 30 is properly sealed. . Of course, the end cover 11 may also be a cover structure with an opening on one side, which is not limited in this application. In order to facilitate the electrical conduction of the electrode assembly 50 located in the housing 30, the end cover assembly 10 may also include a conductive electrode post 16, which may be passed through the end cover member 11 and the insulating member 13, And electrically connected to the electrode assembly 50 . At the same time, in order to facilitate the injection of electrolyte, the end cap 11 may also be provided with a liquid injection hole 17 communicating with the space enclosed by the end cap assembly 10 and the housing 30 . The exhaust hole 111 provided on the end cover 11 can be used for exhausting, that is, for communicating with the space formed by the end cover assembly 10 and the housing 30 and the outside world, so that the air pressure in the housing 30 can pass through. When it is large, exhaust and pressure relief can be performed through the exhaust hole 111 . Wherein, the shape of the exhaust hole 111 may be a rectangle, a square, a racetrack or any other shape, which is not specifically limited in the present application. The number of exhaust holes 111 can be set to one, of course, in other embodiments, there can also be two or more. The explosion-proof valve 12 can be used to seal the exhaust hole 111 , and can be opened to discharge the gas in the housing 30 when the air pressure in the housing 30 is too high. Wherein, the explosion-proof valve 12 and the end cover 11 can be arranged in an integral structure. That is, both are formed into an integral structure. At this time, such setting can enhance the connection strength between the explosion-proof valve 12 and the end cover 11 , so that the explosion-proof valve 12 can work normally and stably. And most importantly, such setting can improve the sealing effect of the explosion-proof valve 12 on the exhaust hole 111 on the end cover 11 . Of course, it should be noted that the present application is not limited thereto, and in other embodiments, it is also possible that the explosion-proof valve 12 and the end cover 11 are arranged separately. The insulator 13 can be used to insulate the end cap 11 and the electrode assembly 50 inside the housing 30 to avoid electric leakage and battery short circuit accidents and improve the safety of the battery. Wherein, the material of the insulating member 13 can be plastic, so that the material is easy to obtain and easy to manufacture. In addition, the insulator 13 can also be arranged in a plate-like structure, so that its shape is relatively regular and easy to process and shape, so as to further improve the convenience of battery manufacturing. At this time, the shape of the insulating member 13 may also be a rectangle, a square or other shapes, etc., specifically, it may be adaptively set according to the shape of the end cover member 11 . Certainly, the insulator 13 may also be a cover structure with an opening on one side, which is not limited in this application. The material removal hole 131 on the insulator 13 can be used to facilitate the flow of high-temperature gas in the housing 30, and more importantly, it will remove the area part of the insulator 13 corresponding to the vent hole 111 and the explosion-proof valve 12. In order to avoid the high-temperature spatter source from being partially melted by the high-temperature gas in this region, the area of the material removal hole 131 is set to be greater than or equal to the area of the exhaust hole 111 . Wherein, the shape of the material removal hole 131 may be square, circular, oval or any other shape, which is not specifically limited in this application.

When the end cap assembly 10 in this solution is applied to a battery, it can cover the opening of the casing 30 to isolate and protect the electrode assembly 50 inside the casing 30 . Moreover, it is particularly important that when the battery has thermal runaway and the high-temperature gas in the battery is discharged through the explosion-proof valve 12 arranged in the vent hole 111 for pressure relief, since the insulating member 13 in the end cap assembly 10 is in the corresponding discharge The position of the air hole 111 is provided with a material removal hole 131. When the exhaust direction of the exhaust hole 111 is defined as the direction from bottom to top, it can also be said that the material removal hole 131 is formed at the position below the explosion-proof valve 12, and The area of the material removal hole 131 is greater than or equal to the area of the exhaust hole 111, so that the high-temperature gas in the battery can pass through the material removal hole 131 relatively smoothly, and can better avoid the occurrence of similar end caps in the prior art. The insulator 13 of the component 10 is melted by the high-temperature gas in the area corresponding to the explosion-proof valve 12 and followed by the discharge of the gas to form high-temperature splashes. Therefore, the structural arrangement of the end cap assembly 10 in this solution can reduce the possibility of high-temperature splashing and discharge in the battery, thereby reducing the occurrence of battery fire and explosion accidents, thereby improving the safety of battery use.

Please refer to FIG. 5 and FIG. 6 in combination. In an embodiment of the present invention, the end cover assembly 10 further includes a barrier 14, the barrier 14 is arranged on the end cover 11, and is opposite to the explosion-proof valve 12, and the barrier 14 is also provided with a plurality of air holes 141.

The barrier 14 can be used to block the high-temperature splashes that may be included in the high-temperature gas (the splashes that may be formed by the melting of the diaphragm or other objects in the electrode assembly 50 in the housing 30) to prevent them from being discharged into the air Spontaneous combustion occurred. At the same time, in order to ensure that the high-temperature gas can still be discharged and released, an air passage 141 is provided on the barrier 14 . Wherein, the material of the barrier member 14 can be metal or ceramics, so that it has high temperature resistance and can remain unaffected after absorbing high temperature gas. The barrier member 14 can be a plate structure, and certainly can also be a cover structure with an opening at one end (in this case, the exhaust hole 111 or the explosion-proof valve 12 can be covered). When the exhaust direction of the exhaust hole 111 is defined as the direction from bottom to top, the position of the barrier 14 can be set above the explosion-proof valve 12 , of course, it can also be set below the explosion-proof valve 12 . The shape of the air passage holes 141 provided on the barrier 14 may be circular, square, elliptical or other shapes. That is to say, the shape of the air passage hole 141 can be any shape, as long as the air flow can pass through. And the shapes of the air holes 141 can be the same, or they can be different. Likewise, the sizes of the air holes 141 can be the same, or they can also be different.

In this embodiment, the barrier 14 can further block the high-temperature splashes that may be included in the high-temperature gas, such as the diaphragm in the electrode assembly 50 in the housing 30 or the high temperature formed by melting of other objects. splatter. In this way, by setting the material removal hole 131 on the insulator 13 to remove the high-temperature splatter formed in this part, and at the same time cooperate with the barrier 14 to block the high-temperature splatter that may be formed by other objects in the battery, which can greatly reduce the internal temperature of the battery. The possibility of high-temperature splash discharge can further reduce the occurrence of battery fire and explosion accidents and greatly improve the safety of battery use.

Please refer to FIG. 5 , in an embodiment of the present invention, the barrier member 14 and the explosion-proof valve 12 are arranged sequentially along the exhaust direction of the exhaust hole 111 .

When the exhaust direction of the exhaust hole 111 is defined as the direction from bottom to top, the barrier 14 is arranged below the explosion-proof valve 12 .

In this implementation, since the high-temperature gas is discharged from bottom to top, it can contact the barrier 14 first. In this way, the barrier 14 can block the high-temperature spatter mixed with the high-temperature gas early on the gas flow path, thereby improving the effect of blocking the high-temperature spatter inside the battery.

Please refer to FIG. 5 , in an embodiment of the present invention, the blocking member 14 is disposed in the exhaust hole 111 .

When the exhaust hole 111 has upper and lower ends, the explosion-proof valve 12 can be sealed on the upper end of the exhaust hole 111 , and the barrier member 14 can be arranged in the lower end of the exhaust hole 111 .

In this embodiment, the barrier member 14 is directly arranged in the exhaust hole 111 , so that the barrier member 14 can be arranged more compactly without affecting the stacking height of the end cover member 11 and the insulating member 13 . Moreover, such setting enables the barrier 14 to fully and effectively block high-temperature splashes that may be included in the high-temperature gas passing through the exhaust hole 111 . In addition, the barrier member 14 provided at this time is also convenient to be provided in an integrated structure with the end cover member 11 .

Please refer to FIG. 7 and FIG. 8 in combination. In an embodiment of the present invention, the barrier member 14 is arranged on the side of the end cover member 11 facing the insulating member 13 and is located in the material removal hole 131. The barrier member 14 is also connected to the material removal The walls of the holes 131 are arranged at intervals.

When the exhaust direction of the exhaust hole 111 is defined as the direction from bottom to top, the barrier member 14 is disposed on the lower surface of the insulating member 13 . At this time, it is convenient to arrange the barrier member 14 and the end cover member 11 as separate bodies, so that the barrier member 14 can be adapted to use scenarios with exhaust holes 111 of different sizes after being manufactured independently. At the same time, the barrier member 14 is arranged in the material removal hole 131, and is spaced apart from the hole wall of the material removal hole 131, so that the end cover member 11 and the insulating member 13 can be arranged more compactly, and the barrier member 14 absorbs Even after high temperature, it will not touch the insulating member 13 and make it melt. Wherein, after the barrier member 14 and the end cover member 11 are separately manufactured, the barrier member 14 and the end cover member 11 may be welded and fixed subsequently. In this way, there is no need to provide a connection structure on the barrier 14 and the end cover 11 , which is beneficial to protect the structures of the barrier 14 and the end cover 11 themselves. At the same time, fixing by welding can also improve the connection strength between the two.

Please refer to FIG. 5 and FIG. 6 together. In an embodiment of the present invention, an insulating layer 15 is provided on the side of the barrier member 14 away from the explosion-proof valve 12 .

When the barrier 14 and the explosion-proof valve 12 are arranged sequentially from bottom to top, an insulating layer 15 may be provided on the lower surface of the barrier 14 . The insulating layer 15 can be made of ceramics, mica, or high-temperature-resistant insulating varnish with high-temperature resistance.

In this embodiment, since the barrier member 14 may be made of metal material, the insulation layer 15 can be used to insulate one part of the barrier member 14, reducing the occurrence of battery leakage and short circuit accidents, so as to further Improve battery safety. It should be noted that, when the barrier member 14 is not made of metal material, the insulating layer 15 may not be provided.

In an embodiment of the present invention, the diameter of each air hole 141 is greater than or equal to 0.1 mm and less than or equal to 3 mm.

In this embodiment, the diameter of the air passage hole 141 is set to be greater than or equal to 0.1 mm, so that the air passage hole 141 will not be set too small, thereby ensuring the smooth passage of high-temperature gas. And setting the diameter of the air hole to be less than or equal to 3 mm prevents the air hole 141 from being too large, thereby ensuring that the high-temperature spatter mixed in the high-temperature gas can be effectively blocked. Therefore, setting the diameter of the air hole 141 between 0.1 and 3mm can take into account the exhaust efficiency at this place, and at the same time, it is better to block some high-temperature splashes mixed in the airflow. Wherein, the diameter of the air hole 141 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, and of course can be any value in the above range. In order to make the structure of the barrier member 14 more regular and simple, to improve the convenience of its manufacture, the shape and size of each air passage hole 141 can be set the same, and a plurality of air passage holes 141 can also be evenly spaced on the barrier member 14. .

Please refer to FIG. 3 to FIG. 6 . In an embodiment of the present invention, the end cover assembly 10 includes an end cover 11 , an explosion-proof valve 12 , an insulating member 13 and a blocking member 14 . Wherein, the end cover 11 is provided with an exhaust hole 111 , and the exhaust hole 111 runs through two opposite sides of the end cover 11 . The explosion-proof valve 12 is arranged on the end cover 11 and is integrated with the end cover 11 , and the explosion-proof valve 12 also seals the exhaust hole 111 . The insulator 13 is located on the side of the end cover 11 away from the explosion-proof valve 12, and the insulator 13 is provided with a material removal hole 131 at a position corresponding to the exhaust hole 111, and the area of the material removal hole 131 is greater than or equal to that of the exhaust hole 111. area. The barrier member 14 is arranged in the exhaust hole 111 and is integrated with the end cover member 11 . The barrier member 14 and the explosion-proof valve 12 are arranged sequentially along the exhaust direction of the exhaust hole 111 . Further, the barrier 14 is also provided with a plurality of air holes 141, the diameter of each air hole 141 is greater than or equal to 0.1 mm and less than or equal to 3 mm, and each air hole 141 has the same shape and size, and the multiple air holes 141 are evenly spaced on the barrier member 14 . In addition, an insulating layer 15 is provided on the side of the barrier member 14 facing away from the explosion-proof valve 12 .

Please refer to FIG. 1 to FIG. 4. The present invention also proposes a battery cell 100, which includes a casing 30, an end cap assembly 10, and an electrode assembly 50. For the specific structure of the end cap assembly 10, refer to the above-mentioned implementation. For example, since the present battery cell 100 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Wherein, one end of the casing 30 is formed with an opening, the electrode assembly 50 is disposed in the casing 30, the end cap assembly 10 covers the opening of the casing 30, and the insulating member 13 in the end cap assembly 10 faces the electrode assembly 50, also That is, the insulating part 13 is located on the inner side, while the end cover part 11 is located on the outer side. The battery cell 100 may be a lithium-ion secondary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The shape of the battery cell 100 may be a flat body, a cuboid, a cylinder, or other shapes.

The present invention also proposes a battery. The battery cell 100 includes a box body and the battery cell 100. For the specific structure of the battery cell 100, refer to the above-mentioned embodiments. Since this battery adopts all the technical solutions of all the above-mentioned embodiments, therefore It has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described here one by one. Wherein, the battery cell 100 is arranged in the case, and may include one or at least two battery cells 100 . When multiple battery cells 100 are included, the multiple battery cells 100 may be connected in series, or connected in parallel, or connected in both series and parallel.

The present invention also proposes an electric device, which includes a box device main body and a battery. For the specific structure of the battery, refer to the above-mentioned embodiments. Since this electric device adopts all the technical solutions of all the above-mentioned embodiments, it has at least All the beneficial effects brought about by the technical solutions of the above embodiments will not be repeated here. Wherein, the battery is installed in the main body of the device, and provides electric energy for the main body of the device, and the electrical device may specifically be an electric car, a battery car, a notebook computer, an electric toy, or other devices that need to use the battery to perform functions.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (13)

1. An end cap assembly, comprising:

the end cover part is provided with exhaust holes which penetrate through two opposite sides of the end cover part;

the explosion-proof valve is arranged on the end cover part and seals the exhaust hole; and

the insulating part, the insulating part with the end cover spare is range upon range of setting, just the insulating part is in corresponding the position in exhaust hole is equipped with the hole of unloading, the area in hole of unloading is more than or equal to the area in exhaust hole.

2. The end cap assembly of claim 1 further comprising a barrier member disposed on the end cap member opposite the explosion-proof valve, the barrier member further having a plurality of venting holes.

3. The end cap assembly of claim 2 wherein said barrier and said explosion-proof valve are disposed in series along the venting direction of said vent.

4. The end cap assembly of claim 3 wherein the barrier is disposed within the vent hole.

5. The end cap assembly of claim 4 wherein the barrier and the end cap are provided as a unitary structure.

6. The end cap assembly of claim 3 wherein said blocking member is disposed on a side of said end cap member facing said insulator member and within said stripping aperture, said blocking member being spaced from an aperture wall of said stripping aperture.

7. The end cap assembly of claim 6 wherein the barrier member and the end cap member are secured by welding.

8. An end cap assembly according to any one of claims 3 to 7 wherein the barrier is provided with an insulating layer on the side of the barrier facing away from the explosion proof valve.

9. The end cap assembly of any one of claims 2-8, wherein each of the through holes has a diameter of greater than or equal to 0.1 mm and less than or equal to 3 mm;

and/or the shape and the size of each air passing hole are the same;

and/or the air holes are uniformly distributed on the barrier piece at intervals.

10. An end cap assembly according to any one of claims 1 to 9 wherein said explosion-proof valve and said end cap member are provided as a unitary structure;

and/or the end cover part and the insulating part are both of plate-shaped structures.

11. A battery cell, comprising a casing, an end cap assembly and an electrode assembly, wherein an opening is formed at one end of the casing, the electrode assembly is disposed in the casing, the end cap assembly covers the opening of the casing, the end cap assembly is the end cap assembly according to any one of claims 1 to 10, and the insulating member of the end cap assembly faces the electrode assembly.

12. A battery, characterized by comprising a box body and a single battery cell arranged in the box body, wherein the single battery cell is the single battery cell as claimed in claim 11.

13. An electric device comprising a device body and a battery provided in the device body, wherein the battery is the battery according to claim 12.

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