CN115832548B

CN115832548B - Battery cell, battery and electricity utilization device

Info

Publication number: CN115832548B
Application number: CN202211343629.7A
Authority: CN
Inventors: 王文轩; 王国宝; 白璐璐; 曹娇
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2024-01-05
Anticipated expiration: 2042-10-28
Also published as: CN115832548A

Abstract

The invention discloses an end cover assembly, a battery cell, a battery and an electric device. Wherein the end cover member is provided with an exhaust hole penetrating through two opposite sides of the end cover member; the explosion-proof valve is arranged on the end cover piece and seals the exhaust hole; the insulating piece with the explosion-proof valve is the range upon range of setting, just the insulating piece is corresponding the position of exhaust hole is equipped with the hole that removes the material, the area that removes the material hole is greater than or equal to the area of exhaust hole. According to the technical scheme, the possibility of discharging high Wen Penjian objects in the battery can be reduced, and then the occurrence of fire and explosion accidents of the battery is reduced, so that the use safety of the battery is improved.

Description

Battery cell, battery and electricity utilization device

Technical Field

The invention relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.

Background

In general, the cause of the battery safety problem is thermal runaway, that is, as the temperature is continuously increased, various reactions occur inside the battery, such as: SEI decomposition, the reduction reaction of the anode and the electrolyte, the oxidation reaction of the cathode and the electrolyte, and the self-heating evaporation and decomposition of the electrolyte. Various reactions cause a continuous increase in the battery temperature with the generation of a large amount of gas, and thus the internal pressure of the battery increases sharply. Therefore, in order to prevent explosion of the battery due to a sudden increase in the internal pressure of the battery, an explosion-proof valve is generally provided in a part of the top cap assembly of the battery so that when the internal pressure of the battery increases sharply, high-temperature gas in the battery can be discharged from the explosion-proof valve to be discharged for pressure relief.

However, the top cover assembly in such batteries typically includes a top cover plate and a plastic plate in a stacked arrangement, with the top cover plate having an explosion-proof valve mounted on a side thereof facing away from the plastic plate. When the high-temperature gas is discharged from the explosion-proof valve, the region corresponding to the explosion-proof valve in the plastic plate is melted by the high-temperature gas and is discharged along with the gas to form a high Wen Penjian object. At this time, the high-temperature splash is still liable to self-ignite after being discharged to the outside of the battery to contact with air, thereby causing ignition and explosion accidents of the battery. Therefore, the battery still has certain potential safety hazard when in use.

Disclosure of Invention

The main object of the present invention is to provide an end cap assembly aimed at improving the safety of the use of the battery.

To achieve the above object, the present invention provides an end cap assembly comprising:

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

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

the insulating piece, the insulating piece with the end cover spare is the range upon range of setting, just the insulating piece is corresponding the position of exhaust hole is equipped with the material hole that removes, the area that removes the material hole is greater than or equal to the area of exhaust hole.

The end cover assembly in this scheme can be in the opening of casing when being applied to the battery to electrode assembly in the casing plays the isolation protection effect. Moreover, it is particularly important that when the battery is subjected to pressure relief through the discharge of the explosion-proof valve arranged at the exhaust hole due to thermal runaway, the insulating part in the end cover assembly is provided with the material removing hole at the position corresponding to the exhaust hole, when the exhaust direction of the exhaust hole is defined as the direction from bottom to top, the material removing hole is formed at the position below the explosion-proof valve, and the area of the material removing hole is larger than or equal to that of the exhaust hole, so that the high-temperature gas in the battery can smoothly pass through the material removing hole, and the phenomenon that the insulating part similar to the end cover assembly in the prior art is melted by the high-temperature gas and is discharged along with the gas in the region corresponding to the explosion-proof valve can be better avoided. Therefore, the structure of the end cover assembly in the scheme can reduce the possibility of high-temperature splashing discharge in the battery, and further reduce the occurrence of battery fire and explosion accidents, thereby being beneficial to improving the use safety of the battery.

In an embodiment of the invention, the end cover assembly further includes a blocking member, the blocking member is disposed on the end cover member and opposite to the explosion-proof valve, and the blocking member is further provided with a plurality of air passing holes.

At this time, the high Wen Penjian possibly mixed in the high-temperature gas can be further blocked by the blocking piece, so that the fire and explosion accidents of the battery caused by the spontaneous combustion of air after the high Wen Penjian is discharged out of the battery are avoided.

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

At this time, the high-temperature gas passes through the blocking piece and then passes through the explosion-proof valve, so that the high Wen Penjian object mixed with the high-temperature gas can be blocked by the blocking piece on the flow path of the air flow, and the effect of blocking the high Wen Penjian object in the battery can be improved.

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

At this time, the separation piece is directly arranged in the exhaust hole, so that the separation piece is more compact, and the high Wen Penjian possibly mixed in the high-temperature gas passing through the exhaust hole can be sufficiently and effectively separated.

In one embodiment of the invention, the barrier and the end cap are provided in a unitary structure.

At this time, the blocking piece and the end cover piece can be formed into a whole during molding, and then the blocking piece and the end cover piece are not required to be assembled and connected in a subsequent additional mode, so that convenience in manufacturing the end cover assembly is improved. Meanwhile, the connection strength of the two can be improved by the arrangement.

In an embodiment of the present invention, the blocking member is disposed on a side of the end cover facing the insulating member and is located in the material removing hole, and the blocking member is further disposed at a distance from a wall of the material removing hole.

At this time, the separation piece and the end cover piece are conveniently arranged in a split mode, so that the separation piece is independently manufactured and then is adapted to use scenes of the exhaust holes with different sizes. Meanwhile, the blocking piece is arranged in the material removing hole and is arranged at intervals with the hole wall of the material removing hole, so that the end cover piece and the insulating piece can be arranged more compactly, and the blocking piece can not contact the insulating piece to melt the insulating piece after absorbing high temperature.

In one embodiment of the invention, the barrier member and the end cap member are welded together.

At this time, the blocking member and the end cap member are fixed by welding, so that there is no need to provide a connection structure on the blocking member and the end cap member, thereby being beneficial to protecting the structures of the blocking member and the end cap member. Meanwhile, the connection strength between the two can be improved through welding and fixing.

In an embodiment of the invention, the side of the barrier facing away from the explosion-proof valve is provided with an insulating layer.

At this time, the insulating layer can also play an insulating role on the blocking piece, so that battery leakage and short-circuit accidents are reduced, and the use safety of the battery is further improved.

In an embodiment of the present invention, a diameter of each of the air passing holes is 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 plurality of air passing holes are uniformly distributed on the blocking piece at intervals.

At the moment, the diameter of the air passing hole is set between 0.1 mm and 3 mm, so that the air exhausting efficiency of the air passing hole can be considered, and meanwhile, some high Wen Penjian objects mixed in the air flow are well blocked. The shape and the size of each air passing hole are the same, and the shape and the structure of the blocking piece are quite simple, so that the convenience of processing and forming is improved. The plurality of air passing holes are uniformly distributed at intervals, so that the shape and structure of the blocking piece are quite simple, and convenience for processing and forming is improved.

In one embodiment of the invention, the explosion protection valve and the end cap are provided in an integral structure;

and/or the end cap member and the insulating member are each plate-like structures.

At this time, set up explosion-proof valve and end cover spare as an organic whole structure for can strengthen the joint strength of both, so that the better can normally stable work of explosion-proof valve. And particularly, the sealing effect of the explosion-proof valve on the exhaust hole on the end cover piece can be better ensured by the arrangement. And set up end cover spare and insulating part into plate body structure, then can make the structure of end cover spare and insulating part all comparatively regular to be favorable to improving the convenience to battery machine-shaping.

The invention also provides a battery monomer, which comprises a shell, an end cover assembly and an electrode assembly, wherein an opening is formed at one end of the shell, the shell is arranged in the bottom shell, the end cover assembly covers the opening of the bottom shell, the end cover assembly is in any scheme, and an insulating part in the end cover assembly faces the electrode assembly.

The invention also provides a battery, which comprises a box body and a battery monomer arranged in the box body, wherein the battery monomer is the battery monomer.

The invention also provides an electric device, which comprises a device main body and a battery arranged on the device main body, wherein the battery is the battery.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a battery cell according to an embodiment of the present invention;

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

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

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

FIG. 5 is a schematic view of an exploded view of the end cap assembly of FIG. 3;

FIG. 6 is a schematic view of an exploded view of the barrier and insulator plate of the end cap assembly of FIG. 5;

FIG. 7 is a schematic view of another embodiment of an end cap assembly of the present invention;

fig. 8 is a schematic view of an exploded view of the end cap assembly of fig. 7.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The applicant has noted that the end cap assembly of the battery of the related art generally includes a top cap plate and a plastic plate which are stacked, and an explosion-proof valve is installed at a side of the top cap plate facing away from the plastic plate, so that when the internal pressure of the battery increases sharply, high-temperature gas in the battery can be discharged from the explosion-proof valve to be discharged for pressure relief. At this time, explosion accidents of the battery due to excessive internal pressure can be prevented. However, when the high-temperature gas is discharged from the explosion-proof valve, the region of the plastic plate corresponding to the explosion-proof valve is melted by the high-temperature gas and is discharged along with the gas to form a high Wen Penjian object. At this time, the high-temperature splashed matter is easy to self-ignite after being discharged to the outside of the battery and contacts with air, so that the battery is triggered to fire and explode, and certain potential safety hazards still exist when the battery is used.

Based on the above considerations, in order to solve the problem that the battery in the related art is liable to cause the fire and explosion accident of the battery due to the high Wen Penjian discharge, referring to fig. 1 to 5 in combination, the applicant devised an end cap assembly 10 applied to a battery cell 100. In one embodiment of the present invention, the end cap assembly 10 includes an end cap member 11, an explosion proof valve 12, and an insulator member 13. The end cap 11 is provided with exhaust holes 111, and the exhaust holes 111 penetrate through two opposite sides of the end cap 11; the explosion-proof valve 12 is arranged on the end cover piece 11 and seals the exhaust hole 111; the insulating member 13 and the end cover member 11 are stacked, and the insulating member 13 is provided with a stripping hole 131 at a position corresponding to the exhaust hole 111, and the area of the stripping hole 131 is greater than or equal to the area of the exhaust hole 111.

The end cap 11 may be used to cover an opening (which may be provided on an upper surface or other side surface of the case 30) on the case 30 of the battery cell 100 (configured of the case 30 and the electrode assembly 50 and electrolyte provided in the case 30, the electrode assembly 50 may be a laminated electrode assembly 50 or a rolled electrode assembly 50) to close the electrode assembly 50 positioned in the case 30. The end cap 11 may be made of metal to enhance the strength of the top plate and improve the service life, and may also protect the electrode assembly 50 located in the case 30. Of course, the present application is not limited thereto, and in other embodiments, the material of the end cap 11 may be plastic, ceramic, or the like. In addition, the end cap 11 may be provided in a plate-like structure so that its shape is relatively regular to facilitate the process of molding it, thereby improving the convenience of manufacturing the battery. At this time, the shape of the end cap 11 may be rectangular, square or other shapes, and specifically, the shape of the opening on the housing 30 may be adaptively set, so as to ensure that the opening on the housing 30 is covered by the adapting cover. Of course, the end cap 11 may be a cover structure having an opening at one side, which is not limited in this application. In order to facilitate electrical conduction to the electrode assembly 50 located in the case 30, the end cap assembly 10 may further include a conductive post 16, and the conductive post 16 may be disposed through the end cap 11 and the insulating member 13 and electrically connected to the electrode assembly 50. Meanwhile, in order to facilitate electrolyte filling, the end cap member 11 may be further provided with a filling hole 17 for communicating with a space defined by the end cap assembly 10 and the housing 30. The vent hole 111 provided in the end cap 11 may be used for venting, i.e., for communicating the space defined by the end cap assembly 10 and the housing 30 with the outside, so that venting pressure may be released through the vent hole 111 when excessive air pressure within the housing 30 occurs. The shape of the vent hole 111 may be rectangular, square, racetrack, or any other shape, which is not particularly limited in this application. While the number of the exhaust holes 111 may be set to one, of course, two or more may be provided in other embodiments, etc. The explosion-proof valve 12 may be used to seal the vent hole 111 and may be opened to allow the venting of gas within the housing 30 when the gas pressure within the housing 30 is excessive. Wherein the explosion proof valve 12 and the end cap 11 may be provided in an integrated structure. I.e. both are formed as one unitary structure. At this time, the connection strength between the explosion-proof valve 12 and the end cap 11 can be enhanced by this arrangement, so that the explosion-proof valve 12 can work normally and stably. And more importantly, this arrangement improves the sealing effect of the valve 12 against the vent hole 111 in the end cap 11. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, the explosion-proof valve 12 and the end cap 11 may be provided separately. The insulating member 13 may serve to insulate the end cap member 11 and the electrode assembly 50 located in the case 30, to prevent leakage and short-circuit of the battery, and to improve the safety of the battery. The insulating member 13 may be made of plastic, so that the material is easy to obtain and manufacture. In addition, the insulating member 13 may be provided in a plate-like structure so that its shape is relatively regular to facilitate the processing and molding thereof, thereby further improving the convenience in manufacturing the battery. In this case, the shape of the insulating member 13 may be rectangular, square, or other shapes, and the like, and specifically, may be adaptively set according to the shape of the end cap 11. Of course, the insulator 13 may be a cover structure having an opening at one side, which is not limited in this application. The material removing hole 131 on the insulating member 13 may be used to facilitate the high temperature gas flowing through the housing 30, and more importantly, the area of the material removing hole 131 is set to be larger than or equal to the area of the air outlet 111, because the area of the insulating member 13 corresponding to the air outlet 111 and the explosion-proof valve 12 is removed to avoid the high temperature splash source caused by the high temperature gas melting. The shape of the stripping hole 131 may be square, circular, elliptical or any other shape, which is not specifically limited in this application.

The end cap assembly 10 of the present embodiment can be covered on the opening of the case 30 to provide insulation protection for the electrode assembly 50 positioned in the case 30 when applied to a battery. Moreover, it is particularly important that when the battery is subjected to thermal runaway and the high temperature gas in the battery is discharged through the explosion-proof valve 12 provided at the vent hole 111 to be depressurized, since the insulating member 13 in the end cap assembly 10 is provided with the material removing hole 131 at the position corresponding to the vent hole 111, when the direction of the vent hole 111 is defined as the bottom-up direction, the material removing hole 131 is formed at the position below the explosion-proof valve 12, and the area of the material removing hole 131 is larger than or equal to the area of the vent hole 111, so that the high temperature gas in the battery can pass through the material removing hole 131 more smoothly, and the phenomenon similar to the phenomenon that the insulating member 13 of the end cap assembly 10 in the prior art is melted by the high temperature gas and discharged along with the gas can be well avoided. Therefore, the structural arrangement of the end cover assembly 10 in the scheme can reduce the possibility of high-temperature splashing discharge in the battery, thereby reducing the occurrence of battery fire and explosion accidents, and being beneficial to improving the use safety of the battery.

Referring to fig. 5 and fig. 6 in combination, in an embodiment of the invention, the end cap assembly 10 further includes a blocking member 14, the blocking member 14 is disposed on the end cap 11 and opposite to the explosion-proof valve 12, and the blocking member 14 is further provided with a plurality of air passing holes 141.

The barrier 14 may be used to block high temperature splashes that may be entrained in the high temperature gas (splashes that may be formed by melting of a membrane or other object in the electrode assembly 50 within the housing 30) from self-ignition by exposure to air. Meanwhile, in order to ensure that the high temperature gas can still be discharged and decompressed, the barrier 14 is provided with the gas passing holes 141. The material of the barrier member 14 may be metal or ceramic, so that it has high temperature resistance and is not affected after absorbing high temperature gas. The blocking member 14 may be a plate structure, or may be a cover structure having an opening at one end (in this case, the vent hole 111 or the explosion-proof valve 12 may be covered). When the direction of the exhaust hole 111 is defined to be the bottom-up direction, the position of the blocking member 14 may be set above the explosion-proof valve 12, or may be set below the explosion-proof valve 12. The shape of the air passing hole 141 provided in the blocking member 14 may be circular, square, elliptical, or other shapes. That is, the shape of the air passing hole 141 may be any shape, so that the air passing hole can be ensured. The shape of the respective air holes 141 may be the same, or may be different. Similarly, the size of the respective air holes 141 may be the same, or may be different.

In this embodiment, the barrier member 14 may further provide a barrier to high Wen Penjian objects that may be entrained in the high temperature gas, such as a separator in the electrode assembly 50 within the housing 30 or high Wen Penjian objects formed by melting other objects. Therefore, the material removing holes 131 are formed in the insulating piece 13 to remove the high Wen Penjian objects formed in the part, and meanwhile, the blocking piece 14 is matched to block the high Wen Penjian objects possibly formed by other objects in the battery, so that the possibility of high-temperature splashing discharge in the battery can be greatly reduced, and the safety of the battery in use can be greatly improved due to the fact that the fire and explosion accidents of the battery are further reduced.

Referring to fig. 5, in an embodiment of the present invention, the barrier member 14 and the explosion-proof valve 12 are disposed in sequence along the exhaust direction of the exhaust hole 111.

When the exhaust direction of the exhaust hole 111 is defined to be the bottom-up direction, the barrier 14 is disposed below the explosion-proof valve 12.

In this embodiment, the high temperature gas is exhausted from the bottom to the top, so that the high temperature gas can contact the barrier 14 first. This means that the barrier member 14 can earlier block the high Wen Penjian material mixed with the high temperature gas in the gas flow path, thereby advantageously improving the effect of blocking the high Wen Penjian material inside the battery.

Referring to fig. 5, in an embodiment of the present invention, the barrier 14 is disposed in the exhaust hole 111.

When the vent hole 111 has upper and lower ends, the explosion-proof valve 12 may be sealed at the upper end of the vent hole 111, and the barrier 14 may be disposed in the lower end of the vent hole 111.

In the present embodiment, the barrier member 14 is directly provided in the exhaust hole 111, so that the barrier member 14 can be provided more compactly without affecting the lamination height of the end cap member 11 and the insulating member 13. Moreover, the arrangement is such that the barrier member 14 can sufficiently effectively block the high Wen Penjian possibly entrained in the high temperature gas passing through the exhaust hole 111. In addition, the barrier member 14 provided at this time is also conveniently provided in an integral structure with the end cap member 11.

Referring to fig. 7 and 8 in combination, in an embodiment of the invention, the blocking member 14 is disposed on a side of the end cover 11 facing the insulating member 13 and is located in the stripping hole 131, and the blocking member 14 is further disposed at a distance from a wall of the stripping hole 131.

When the exhaust direction of the exhaust hole 111 is defined to be the bottom-up direction, the barrier 14 is provided at the lower surface of the insulator 13. At this time, it is convenient to separately provide the barrier member 14 and the cap member 11 so as to adapt the use scene of the exhaust holes 111 having different sizes after the barrier member 14 is independently manufactured. Meanwhile, the blocking piece 14 is arranged in the material removing hole 131 and is arranged at intervals with the hole wall of the material removing hole 131, so that the end cover piece 11 and the insulating piece 13 can be arranged more compactly, and the blocking piece 14 can not contact the insulating piece 13 to melt after absorbing high temperature. Wherein, after the barrier member 14 and the end cover member 11 are manufactured separately, the barrier member 14 and the end cover member 11 may be welded and fixed later. This eliminates the need for attachment structures on the barrier member 14 and the end cap member 11, thereby facilitating protection of the barrier member 14 and the end cap member 11 itself. Meanwhile, the connection strength between the two can be improved through welding and fixing.

Referring to fig. 5 and 6 in combination, in one embodiment of the present invention, the side of the barrier member 14 facing away from the explosion-proof valve 12 is provided with an insulating layer 15.

When the barrier 14 and the explosion proof valve 12 are provided in this order from bottom to top, an insulating layer 15 may be provided on the lower surface of the barrier 14. The insulating layer 15 may be made of ceramic, mica, or high-temperature insulating paint having high-temperature resistance.

In this embodiment, the blocking member 14 may be made of metal, so that the insulating layer 15 may also insulate the blocking member 14, so as to reduce battery leakage and short-circuit accidents, and further improve the safety of battery use. Note that, when the barrier member 14 is not made of a metal material, the insulating layer 15 may not be provided.

In an embodiment of the present invention, the diameter of each of the air passing holes 141 is 0.1 mm or more and 3 mm or less.

In the present embodiment, the diameter of the gas passing hole 141 is set to be 0.1 mm or more so that the gas passing hole 141 is not set to be too small, and thus the smoothness of the passage of the high temperature gas can be ensured. The diameter of the air hole is smaller than or equal to 3 mm, so that the air passing hole 141 is not excessively large, and the high Wen Penjian objects mixed in the high-temperature gas can be effectively blocked. Therefore, the diameter of the air passing hole 141 is set to be between 0.1 and 3 mm, so that the air exhausting efficiency can be considered, and meanwhile, some high Wen Penjian objects mixed in the air flow are well blocked. The diameter of the air passing hole 141 may be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm, or may be any value in the above section. In order to make the structure of the blocking member 14 more regular and simple, so as to improve the convenience of manufacturing, the shape and size of each air passing hole 141 may be the same, and the plurality of air passing holes 141 may be uniformly distributed on the blocking member 14 at intervals.

Referring to fig. 3 to 6, in an embodiment of the present invention, the end cap assembly 10 includes an end cap 11, an explosion-proof valve 12, an insulating member 13, and a blocking member 14. Wherein the end cap 11 is provided with exhaust holes 111, the exhaust holes 111 penetrating opposite sides of the end cap 11. The explosion-proof valve 12 is provided on the end cap 11 and is integrally provided with the end cap 11, and the explosion-proof valve 12 also seals the exhaust hole 111. The insulating part 13 is arranged on one side of the end cover part 11, which is away from the explosion-proof valve 12, and the insulating part 13 is provided with a material removing hole 131 at a position corresponding to the exhaust hole 111, wherein the area of the material removing hole 131 is larger than or equal to that of the exhaust hole 111. The blocking piece 14 is arranged in the exhaust hole 111 and is integrally arranged with the end cover piece 11, and the blocking piece 14 and the explosion-proof valve 12 are also distributed in sequence along the exhaust direction of the exhaust hole 111. Further, the blocking member 14 is further provided with a plurality of air passing holes 141, the diameter of each air passing hole 141 is greater than or equal to 0.1 mm and less than or equal to 3 mm, the shape and the size of each air passing hole 141 are the same, and the plurality of air passing holes 141 are uniformly distributed on the blocking member 14 at intervals. Furthermore, the side of the blocking element 14 facing away from the explosion-proof valve 12 is provided with an insulating layer 15.

Referring to fig. 1 to fig. 4 in combination, the present invention further provides a battery cell 100, where the battery cell 100 includes a housing 30, an end cap assembly 10 and an electrode assembly 50, and the specific structure of the end cap assembly 10 refers to the above embodiment, and since the battery cell 100 adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described herein again. Wherein, an opening is formed at one end of the case 30, the electrode assembly 50 is disposed in the case 30, the end cap assembly 10 covers the opening of the case 30, and the insulating member 13 in the end cap assembly 10 faces the electrode assembly 50, i.e., the insulating member 13 is located at the inner side, and the end cap member 11 is located at the outer side. The battery cell 100 may be a lithium ion secondary battery, a lithium sulfur battery, a sodium ion battery, a magnesium ion battery, or the like. And the battery cell 100 may have a flat body, a rectangular parallelepiped, a cylindrical body, or other shapes.

The invention also provides a battery, the battery unit 100 comprises a box body and the battery unit 100, and the specific structure of the battery unit 100 refers to the above embodiments, and since the battery adopts all the technical schemes of all the embodiments, the battery has at least all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here. The battery cells 100 are disposed in the case, and may include one or at least two battery cells 100. When a plurality of battery cells 100 are included, the plurality of battery cells 100 may be connected in series, or in parallel, or both.

The invention also provides an electric device, which comprises a box device main body and a battery, wherein the specific structure of the battery refers to the embodiment, and the electric device at least has all the beneficial effects brought by the technical proposal of the embodiment because the electric device adopts all the technical proposal of the embodiment, and the detailed description is omitted. The battery is arranged on the device main body and provides electric energy for the device main body, and the power utilization device can be an electric automobile, a battery car, a notebook computer, an electric toy or other devices needing to perform functions through the battery.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. The utility model provides a battery cell, its characterized in that includes casing, end cover subassembly and electrode assembly, the one end of casing is formed with the opening, electrode assembly locates in the casing, end cover subassembly lid in the opening of casing, end cover subassembly includes:

the insulating piece and the end cover piece are arranged in a lamination mode and face the electrode assembly, a material removing hole is formed in the insulating piece at a position corresponding to the exhaust hole, and the area of the material removing hole is larger than or equal to that of the exhaust hole;

the end cover assembly further comprises a blocking piece, wherein the blocking piece is arranged on the end cover piece and is opposite to the explosion-proof valve, and the blocking piece is further provided with a plurality of air passing holes;

the blocking piece is arranged on one side of the end cover piece facing the insulating piece and is positioned in the material removing hole, and the blocking piece is also arranged at intervals with the hole wall of the material removing hole;

the diameter of each air passing hole is more 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;

2. The battery cell of claim 1, wherein the barrier and the explosion-proof valve are disposed in series along the exhaust direction of the exhaust hole.

3. The battery cell of claim 2, wherein the barrier is disposed within the vent.

4. The battery cell of claim 3, wherein the barrier member and the end cap member are provided in a unitary structure.

5. The battery cell of claim 1, wherein the barrier member and the end cap member are welded together.

6. The battery cell of claim 2, wherein a side of the barrier facing away from the explosion-proof valve is provided with an insulating layer.

7. The battery cell as defined in any one of claims 1-6, wherein the explosion-proof valve and the end cap member are provided in a unitary structure;

and/or, the end cover piece and the insulating piece are both plate-shaped structures.

8. A battery comprising a case and a battery cell provided in the case, wherein the battery cell is the battery cell according to any one of claims 1 to 7.

9. An electric device, comprising a device body and a battery provided in the device body, wherein the battery is the battery according to claim 8.