CN217182296U - End cover, battery monomer, battery and power consumption device - Google Patents

Abstract

The utility model relates to an end cover, battery monomer, battery and power consumption device in to annotating the sealed of liquid hole, join in marriage the circumference side of sealing member and connect on annotating the pore wall in liquid hole for it is sealed between the pore wall in sealing member and notes liquid hole. Because the pressure relief hole in the sealing element is in sealing fit with the pressure relief piece, when the sealing element is in fit connection with the liquid injection hole, the sealing operation of the liquid injection hole can be completed. And because the pressure relief piece is configured as: when casing internal pressure is greater than or equal to the pressure value of predetermineeing, the pressure release piece takes place to break, consequently, the seal structure of this application can replace the design of the explosion-proof valve that traditional complicacy under the prerequisite of realizing effective sealing function, when casing internal pressure sharply increases, takes place to break the pressure release to prevent the danger that the battery explodes, effectively improve the explosion-proof performance who annotates the liquid hole.

Description

End cover, battery monomer, battery and power consumption device

Technical Field

The utility model relates to a battery technology field especially relates to end cover, battery monomer, battery and power consumption device.

Background

As the application of the battery is more and more extensive, the requirements on various performances of the battery are also higher and higher. Such as: in the manufacturing process of the battery core, the battery core liquid injection hole needs to be sealed so as to improve the overall sealing performance of the battery. However, the pressure inside the battery is inevitably affected after the liquid injection hole is sealed. When the battery fails (for example, short circuit occurs), the internal gas pressure of the battery rapidly increases, and the danger of battery explosion is easy to occur.

Therefore, the explosion-proof valve or the explosion-proof wire in the prior art is used for explosion-proof protection of the battery, the structure is complex, and the explosion-proof performance is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for an end cap, a battery cell, a battery and an electrical device, which have a simple structure and can ensure effective sealing and improve explosion-proof performance.

In a first aspect, the present application provides an end cap for covering an opening of a housing of a battery cell, including: the top cover plate is provided with a liquid injection hole; a seal structure including a seal and a pressure relief; a pressure relief hole is arranged on the sealing element in a penetrating manner, the circumferential side surface of the sealing element, which is back to the pressure relief hole, is in sealing fit with the hole wall of the liquid injection hole, and the pressure relief element is in sealing fit with the inside or the end part of the pressure relief hole so as to block the communication between the pressure relief hole and the shell; when the pressure in the shell is larger than or equal to the preset pressure value, the pressure relief piece is broken.

In the sealing of the liquid injection hole, the end cover is used for matching the circumferential side surface of the sealing element on the hole wall of the liquid injection hole, so that the sealing element and the hole wall of the liquid injection hole are sealed. Because the pressure relief hole in the sealing element is in sealing fit with the pressure relief piece, when the sealing element is in fit connection with the liquid injection hole, the sealing operation of the liquid injection hole can be completed. And because the pressure relief piece is configured as: when casing internal pressure is greater than or equal to the pressure value of predetermineeing, the pressure release piece takes place to break, consequently, the seal structure of this application can replace the design of the explosion-proof valve that traditional complicacy under the prerequisite of realizing effective sealing function, when casing internal pressure sharply increases, takes place to break the pressure release to prevent the danger that the battery explodes, effectively improve the explosion-proof performance who annotates the liquid hole. Simultaneously, will seal and explosion-proof structure integration an organic whole for compromise simultaneously sealed and explosion-proof function in annotating the liquid hole, simplify end cover structural design, be favorable to promoting the compactness of product structure.

In one embodiment, the pressure relief is configured to: when the internal pressure of the shell is smaller than the preset pressure value, the pressure relief piece is elastically deformed along the direction deviating from the shell. So for the pressure relief spare can outwards take place deformation along with casing internal pressure increases to increase the inside space of battery, realize the regulation and control to internal pressure under a certain degree, avoid the inside pressure of battery easily sharply to increase too big.

In one embodiment, the pressure relief element is arched over the sealing element in the direction of the housing and forms a deformation recess on the side of the pressure relief element facing away from the housing. So design for the outside protruding deformation space of pressure relief spare increases, guarantees the inside space increase grow of battery, is favorable to improving the security performance of product.

In one embodiment, the periphery of the pressure relief piece is matched with the end part of the pressure relief hole to form a notch part at the matching part between the pressure relief piece and the pressure relief hole; when the pressure in the shell is greater than or equal to the preset pressure value, the notch part is broken. When the internal pressure of the shell is greater than or equal to the preset pressure value, the pressure relief piece begins to break from the notch part, the pressure inside the battery is relieved in time, and the explosion risk caused by the sharp increase of the internal pressure is avoided.

In one embodiment, the circumferential side surface of the sealing element, which faces away from the pressure relief hole, is detachably matched with the hole wall of the liquid injection hole in a sealing mode. Therefore, when the sealing structure is damaged, the sealing structure can be maintained only by taking out the sealing element from the liquid injection hole, and the whole end cover does not need to be discarded.

In one embodiment, the circumferential side surface of the sealing element, which is back to the pressure relief hole, is provided with an external thread, and the hole wall of the liquid injection hole is provided with an internal thread matched with the external thread. So, the installation of seal structure on the lamina tecti is more convenient, is favorable to improving assembly efficiency.

In one embodiment, the top cover plate is provided with a limiting part, the limiting part extends around the circumferential direction of the liquid injection hole, and the sealing element can be in limiting fit with the limiting part when being matched with the hole wall of the liquid injection hole.

In one embodiment, the sealing element is provided with a screwing part, and the screwing part is used for being matched with the rotating tool. So, be convenient for and rotatory frock cooperation make things convenient for operating personnel rotary seal spare for seal structure's assembly labour saving and time saving.

In a second aspect, the present application provides a battery cell comprising: the shell is internally provided with an accommodating cavity with an opening at the end part; the electric core assembly is accommodated in the accommodating cavity; an end cap according to any of the above, the end cap covering the opening.

In a third aspect, the present application provides a battery including the above battery cell.

In a fourth aspect, the present application provides an electric device comprising the above battery.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a schematic view of a partial structure of an end cap according to some embodiments of the present application;

FIG. 5 is a schematic illustration of another perspective view of a partial structure of an end cap according to some embodiments of the present application;

FIG. 6 is a cross-sectional view of the end cap of FIG. 5 taken along the line A-A;

FIG. 7 is a schematic view of a seal configuration according to some embodiments of the present application;

figure 8 is a cross-sectional view of the seal of figure 7 taken along the direction B-B.

1000. A battery; 2000. a controller; 3000. a motor;

100. a box body; 110. a first portion; 120. a second portion;

200. a battery cell; 10. an end cap; 20. a housing; 30. an electrical core assembly;

11. a top cover plate; 111. a liquid injection hole; 112. a limiting part; 113. an internal thread; 12. a sealing structure; 121. a seal member; 1211. a pressure relief vent; 1212. an external thread; 13. a pressure relief piece; 131. a notch part; 132. a deformation recess;

21. an accommodating chamber; 22. and (4) opening.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the battery is more and more extensive from the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. As the field of application of batteries is continuously expanded, the market demand thereof is also continuously expanded.

The inventor notices that in the manufacturing process of the battery cell, the liquid injection hole of the battery cell needs to be sealed so as to improve the overall sealing performance of the battery. When the battery cell fails (for example, short circuit occurs), the internal gas pressure of the battery cell increases rapidly, and the danger of battery explosion is likely to occur.

In order to solve the problem of the sudden increase and expansion of the internal pressure of the battery monomer and even the explosion risk, the applicant researches and discovers that structures such as an explosion-proof valve or an explosion-proof wire and the like can be arranged on the battery monomer to be used as the explosion-proof protection of the battery; meanwhile, a sealing device is required to be arranged for sealing the liquid injection hole. However, such end caps need to be provided with structures such as an explosion-proof valve or an explosion-proof wire, and a sealing device is also needed to be installed, so that the sealing and explosion-proof split design is adopted, and the structure is complicated; but also results in difficulty in ensuring the explosion-proof performance.

Based on the above consideration, in order to solve the problems of the sealing performance and the explosion-proof performance of the battery cell, the inventor has conducted extensive research to design an end cap in which a sealing member is disposed in a liquid injection hole; meanwhile, a pressure relief piece is hermetically matched and connected in a pressure relief hole in the sealing piece so as to block the communication between the pressure relief hole and the shell; when the pressure in the shell is larger than or equal to the preset pressure value, the pressure relief piece is broken.

In such an end cap, when the internal pressure of the case (i.e., the internal pressure of the battery) is less than the preset pressure value, the liquid injection hole is effectively sealed by the cooperation of the sealing member and the pressure relief member. And when the internal pressure of the shell (namely the internal pressure of the battery) is greater than or equal to the preset pressure value, the pressure relief piece is broken, so that the pressure inside the battery monomer is relieved. Therefore, the sealing structure and the explosion-proof structure are integrated, so that the sealing function and the explosion-proof function are both taken into consideration in the liquid injection hole, and the risks of battery explosion and the like caused by the continuous increase of the internal pressure of the battery are avoided; and simultaneously, the structural design of the end cover is simplified.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system who possesses this electric installation of constitution such as battery monomer, battery that this application disclosed can be used, like this, is favorable to alleviating and the free bulging force of automatically regulated battery worsens, and supplementary electrolyte consumes, promotes the stability and the battery life-span of battery performance.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device as an example of a vehicle according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present disclosure. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. The interior of the vehicle is provided with a battery 1000, and the battery 1000 may be provided at the bottom or the head or the tail of the vehicle. The battery 1000 may be used for power supply of a vehicle, for example, the battery 1000 may serve as an operation power source of the vehicle. The vehicle may further include a controller 2000 and a motor 3000, the controller 2000 being configured to control the battery 1000 to power the motor 3000, for example, for start-up, navigation, and operational power requirements while traveling of the vehicle.

In some embodiments of the present application, the battery 1000 may be used not only as an operating power source of a vehicle, but also as a driving power source of the vehicle, instead of or in part of fuel or natural gas, to provide driving power for the vehicle.

Referring to fig. 2, fig. 2 is an exploded view of a battery 1000 according to some embodiments of the present disclosure. The battery 1000 includes a case 100 and a battery cell 200, and the battery cell 200 is accommodated in the case 100. The case 100 is used to provide a receiving space for the battery cells 200, and the case 100 may have various structures. In some embodiments, the case 100 may include a first portion 110 and a second portion 120, the first portion 110 and the second portion 120 cover each other, and the first portion 110 and the second portion 120 together define a receiving space for receiving the battery cell 200. The second part 120 may be a hollow structure with an open end, the first part 110 may be a plate-shaped structure, and the first part 110 covers the open side of the second part 120, so that the first part 110 and the second part 120 together define a receiving space; the first portion 110 and the second portion 120 may be both hollow structures with one side open, and the open side of the first portion 110 is covered on the open side of the second portion 120. Of course, the box 100 formed by the first portion 110 and the second portion 120 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 1000, there may be a plurality of battery cells 200, and a plurality of battery cells 200 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that a plurality of battery cells 200 are connected in series and in parallel. The plurality of battery cells 200 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 200 is accommodated in the box body 100; of course, the battery 1000 may also be a battery 1000 module formed by connecting a plurality of battery cells 200 in series, in parallel, or in series-parallel, and a plurality of battery 1000 modules are connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case 100. The battery 1000 may further include other structures, for example, the battery 1000 may further include a bus member for achieving electrical connection between the plurality of battery cells 200.

Wherein, each battery cell 200 may be a secondary battery 1000 or a primary battery 1000; but is not limited to, the lithium sulfur battery 1000, the sodium ion battery 1000, or the magnesium ion battery 1000. The battery cell 200 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 200 according to some embodiments of the present disclosure. The battery cell 200 refers to the smallest unit constituting the battery 1000. Referring to fig. 3, the battery cell 200 includes the end cap 10, the housing 20, the electric core assembly 30, and other functional components.

According to some embodiments of the present application, referring to fig. 4 and 5, an end cap 10 is provided for covering an opening of a housing 20 of a battery cell 200. The end cap 10 includes: a top cover plate 11 and a sealing structure 12. The top lid 11 is provided with a liquid inlet 111. The seal arrangement 12 includes a seal 121 and a pressure relief member 13. The sealing member 121 is provided with a pressure relief hole 1211 in a penetrating manner, and the circumferential side surface of the sealing member 121, which is back to the pressure relief hole 1211, is in sealing fit with the hole wall of the liquid injection hole 111. The pressure relief member 13 is sealingly coupled to the inside or end of the pressure relief hole 1211 to block communication between the pressure relief hole 1211 and the inside of the case 20. When the pressure inside the case 20 is greater than or equal to a preset pressure value, the pressure relief member 13 is ruptured.

The filling hole 111 is a through hole on the end cap 10 for filling the electrolyte into the battery cell 200. After the liquid is injected into the conventional battery cell 200, the liquid injection hole 111 is usually sealed by a sealing device such as a plug. In order to avoid the explosion risk caused by the sudden expansion of the internal pressure of the battery cell 200, the conventional end cap 10 may be provided with an explosion-proof hole beside the liquid injection hole 111, and the explosion-proof hole is usually provided with an explosion-proof valve or an explosion-proof wire. The pressure relief hole 1211 is formed in the sealing member 121. When the sealing element 121 is hermetically fitted in the liquid filling hole 111, the pressure relief hole 1211 is located in the liquid filling hole 111, so that the sealing and explosion-proof structures on the end cap 10 are integrated in the liquid filling hole 111, and the sealing and explosion-proof structures on the end cap 10 are integrated, thereby facilitating the elimination of the structures such as the explosion-proof hole and the explosion-proof valve on the conventional end cap 10. Of course, in some embodiments, conventional explosion-proof holes, explosion-proof valves and the like can be reserved.

The pressure relief piece 13 can be deformed when being extruded by the internal pressure of the shell 20, and when the internal pressure value is larger than or equal to the preset pressure value, the pressure relief piece can be broken to relieve pressure, so that the explosion-proof effect is realized. In order to adapt to the use environment inside the battery 1000 and to facilitate sealing, the pressure relief member 13 may be formed using a non-conductive packing material having corrosion resistance. Such as: the pressure relief member 13 may be designed as a diaphragm structure made of, but not limited to, teflon, acrylic, polypropylene, or rubber. The preset pressure value may be determined according to the actual performance of the battery 1000 product.

The pressure relief 13, when broken, may occur in the middle of the pressure relief 13, may also occur at the edges of the pressure relief 13, etc. If it is desired to direct the rupture at a location on the pressure relief member 13, a weakness can be provided at a location, such as: the thickness of the part is reduced or a fracture score is arranged on the part.

Meanwhile, referring to fig. 3 and 6, the installation position of the pressure relief member 13 in the pressure relief hole 1211 is not limited, for example: the pressure relief member 13 may be provided at an end of the pressure relief hole 1211, or may be provided inside the pressure relief hole 1211, and it is only necessary to block the communication between the pressure relief hole 1211 and the inside of the casing 20 by the pressure relief member 13, and to prevent the inside of the casing 20 from communicating with the outside through the pressure relief hole 1211.

The sealing member 121 can be engaged with the liquid inlet 111 by a snap fit or a screw connection. When the sealing element 121 is connected in a snap-fit manner, an annular groove or an annular protrusion is formed in the circumferential direction of the sealing element 121, and the hole wall of the liquid filling hole 111 is correspondingly provided with structures such as an annular protrusion or an annular groove, so that the sealing element 121 is snapped in the liquid filling hole 111. Of course, in order to ensure the sealing performance between the packing 121 and the wall of the pour hole 111, a structure such as a weather strip or a sealant may be provided between the packing 121 and the wall of the pour hole 111.

In the sealing of the pour hole 111, the circumferential side surface of the packing 121 is fitted to the hole wall of the pour hole 111 so that the packing 121 is sealed from the hole wall of the pour hole 111. Since the pressure relief member 13 is sealingly fitted in the pressure relief hole 1211 in the sealing member 121, when the sealing member 121 is fitted in the pouring hole 111, the operation of sealing the pouring hole 111 can be completed. And because the pressure relief 13 is configured to: when casing 20 internal pressure is greater than or equal to and predetermines the pressure value, pressure release 13 takes place to break, consequently, the seal structure 12 of this scheme can replace the design of the complicated explosion-proof valve of tradition under the prerequisite of realizing effective sealing function, when casing 20 internal pressure sharply increases, takes place to break the pressure release to prevent battery 1000 from taking place the danger of exploding, effectively improve the explosion-proof ability of annotating liquid hole 111. Meanwhile, the sealing structure and the explosion-proof structure are integrated into a whole, so that the sealing function and the explosion-proof function are simultaneously considered in the liquid injection hole 111, the structural design of the end cover 10 is simplified, and the compactness of the product structure is favorably improved.

According to some embodiments of the present application, optionally, referring to fig. 5, the pressure relief 13 is configured to: when the internal pressure of the housing 20 is smaller than the preset pressure value, the pressure relief piece 13 is elastically deformed in the direction away from the housing 20.

The pressure relief piece 13 is elastically deformed in a direction away from the casing 20, so that the space inside the casing 20 can be increased, which is beneficial to slowing down the increase rate of the pressure inside the casing 20 or reducing the pressure inside the casing 20, and avoiding the risk of the pressure inside the casing 20 rising sharply and the like. When the internal pressure of the case 20 is reduced, that is, the internal pressure of the battery 1000 is reduced, the pressure relief member 13 is subjected to the reduced pressure, and rebounds to restore or approximately restore the original state.

In addition, when the pressure relief member 13 is in the initial state (i.e. before the elastic deformation occurs), the pressure relief member 13 may be designed to be flat in the pressure relief hole 1211, or may be designed to be convex toward the housing 20; of course, a convex design in a direction away from the housing 20 is also possible, etc.

The pressure relief piece 13 is designed to have an elastic deformation function, so that the pressure relief piece 13 can deform outwards along with the increase of the internal pressure of the shell 20, the space inside the battery 1000 is increased, the regulation and control of the internal pressure are realized to a certain degree, and the phenomenon that the internal pressure of the battery 1000 is easily increased sharply and is overlarge is avoided.

According to some embodiments of the present application, optionally, referring to fig. 6, the pressure relief member 13 is arched on the sealing member 121 in a direction toward the housing 20, and a deformation recess 132 is formed on a side of the pressure relief member 13 facing away from the housing 20.

The deformation recess 132 should be understood as: in the initial state (i.e., before the pressure relief member 13 is elastically deformed), the pressure relief member 13 is arched toward the housing 20, and a space is left in a direction away from the housing 20 of the pressure relief member 13. The deformation recess 132 may allow the relief member 13 to deform convexly in a direction away from the housing 20 to increase the amount of outward bulging deformation of the relief member 13.

The deformation concave part 132 is formed on one side surface of the pressure relief piece 13, which is back to the shell 20, so that the deformation space of the pressure relief piece 13 protruding outwards is increased, the increase of the space inside the battery 1000 is ensured to be increased, the pressure inside the battery 1000 can be more stable, and the safety performance of the product is improved.

According to some embodiments of the present application, optionally, referring to fig. 6, the periphery of the pressure relief piece 13 is coupled with the end of the pressure relief hole 1211 to form the scored portion 131 at the coupling position between the pressure relief piece 13 and the pressure relief hole 1211. When the internal pressure of the case 20 is greater than or equal to the preset pressure value, the score part 131 is ruptured.

The score portion 131 should be understood as: the pressure relief member 13 forms a stress concentration portion when it is coupled to the wall of the pressure relief hole 1211, and when the pressure relief member 13 is pressed, a crack occurs on the notch portion 131. Of course, the indented portion 131 may be configured to be manually indented at the mating location by an operator.

The indent portion 131 is formed at the matching position between the pressure relief piece 13 and the hole wall of the pressure relief hole 1211, so that when the internal pressure of the case 20 is greater than or equal to the preset pressure value, the pressure relief piece 13 starts to rupture from the indent portion 131, the internal pressure of the battery 1000 is relieved in time, and the explosion risk caused by the sharp increase of the internal pressure is avoided.

According to some embodiments of the present application, optionally, referring to fig. 7 and 8, the circumferential side of the sealing member 121 facing away from the pressure relief hole 1211 is detachably and sealingly coupled to the hole wall of the injection hole 111.

Alternatively, the circumferential side surface of the sealing member 121 facing away from the pressure relief hole 1211 and the wall of the liquid filling hole 111 may be, but not limited to, threaded connection, clamping connection, etc.

The sealing member 121 is detachably fitted on the wall of the pour hole 111, so that the sealing member 121 is of a replaceable design. Thus, when the sealing structure 12 is damaged, the sealing structure 12 can be maintained only by taking out the sealing member 121 from the liquid injection hole 111, and the whole end cap 10 does not need to be discarded, which is beneficial to reducing the equipment maintenance cost of the battery 1000.

According to some embodiments of the present application, optionally, referring to fig. 6 and 7, the circumferential side of the sealing element 121 facing away from the pressure relief hole 1211 is provided with an external thread 1212. The hole wall of the injection hole 111 is provided with an internal thread 113 matched with the external thread 1212.

When the sealing member 121 is screwed to the hole wall of the pour hole 111, a sealing structure 12 may be provided between the sealing member 121 and the pour hole 111, for example: sealing rubber strips, sealants or raw tapes, etc.

The external thread 1212 is matched with the internal thread 113, so that the sealing element 121 is in sealing fit in the liquid injection hole 111, and the sealing performance of the battery 1000 is improved. Meanwhile, the thread fit is adopted, so that the sealing structure 12 is more convenient to mount on the top cover plate 11, and the assembly efficiency is improved.

According to some embodiments of the present application, optionally, referring to fig. 6, a limiting portion 112 is disposed on the top cover plate 11. The stopper 112 extends around the circumferential direction of the pour hole 111. The sealing element 121 can be in limit fit with the limit part 112 when being matched with the hole wall of the liquid injection hole 111.

Spacing portion 112 extends in order to form the loop configuration around annotating liquid hole 111's circumference, and like this when sealing member 121 connects in annotating liquid hole 111, can support on spacing portion 112, avoids sealing member 121 to connect excessively and stretch out or fall out and annotate outside liquid hole 111, forms spacing protection, guarantees that the structure equipment is stable.

The top cover plate 11 is provided with a limiting part 112 for limiting the matching of the sealing element 121 in the liquid injection hole 111, so as to ensure that the sealing element 121 is stably and quickly assembled in the liquid injection hole 111.

According to some embodiments of the present application, optionally, a screw-driving portion is provided on the sealing member 121. The twisting part is used for being matched with the rotating tool.

The screwing part can be designed into a groove-shaped structure, a convex structure and the like. Such as: when the screwing part is designed to be a groove-shaped structure, the rotating tool is provided with a matched convex structure, such as: the screwing part is a hexagonal groove; the end part of the rotating tool is a hexagonal screw head and the like.

The screwing part is arranged on the sealing element 121, so that the sealing element 121 is convenient to match with a rotating tool, and an operator can rotate the sealing element 121 conveniently, so that the sealing structure 12 is time-saving and labor-saving to assemble.

According to some embodiments of the present application, please refer to fig. 3, which also provides a battery cell 200. The battery cell 200 includes: the housing 20, the electric core assembly 30 and the end cap 10 in any of the above aspects. A housing chamber 21 having an opening at an end is provided in the housing 20. The electric core assembly 30 is accommodated in the accommodating cavity 21. The end cap 10 covers the opening.

According to some embodiments of the present application, please refer to fig. 2, the present application further provides a battery 1000 including the battery cell 200 in the above solution.

According to some embodiments of the present application, please refer to fig. 1, the present application further provides an electric device including the battery 1000 according to the above aspect.

According to some embodiments of the present application, referring to fig. 4 to 8, the present application provides a battery cell liquid injection port thread sealing structure integrated with an explosion-proof sheet, wherein a sealing member 121 is in a straight cover type and is externally threaded. The seal 121 is centrally integrated with a scored sheet that initially bulges outward. When the internal pressure of the battery 1000 increases to a certain value, the internal space of the battery cell is increased and the internal pressure is reduced by bouncing up and deforming inwards in a concave manner; when the pressure inside the battery 1000 sharply increases, the scored sheet is directionally ruptured to release the pressure.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (11)

1. An end cap for covering an opening of a housing of a battery cell, comprising:

the top cover plate is provided with a liquid injection hole;

a seal structure including a seal and a pressure relief; a pressure relief hole is arranged on the sealing element in a penetrating manner, the circumferential side surface of the sealing element, which is back to the pressure relief hole, is in sealing fit with the hole wall of the liquid injection hole, and the pressure relief element is in sealing fit with the inside or the end part of the pressure relief hole so as to block the communication between the pressure relief hole and the shell; when the pressure in the shell is larger than or equal to a preset pressure value, the pressure relief piece is broken.

2. The end closure of claim 1, wherein the relief member is configured to: when the internal pressure of the shell is smaller than the preset pressure value, the pressure relief piece is elastically deformed along the direction departing from the shell.

3. An end closure as claimed in claim 2, in which the pressure relief member is domed on the seal in a direction towards the housing and forms a deformation recess on a side of the pressure relief member facing away from the housing.

4. The end closure of claim 1, wherein a periphery of said pressure relief member mates with an end of said pressure relief hole to form a score at the mating between said pressure relief member and said pressure relief hole; when the internal pressure of the shell is greater than or equal to a preset pressure value, the notch part is broken.

5. An end cap according to claim 1, wherein the circumferential side of the sealing element facing away from the pressure relief hole is detachably and sealingly engaged with the hole wall of the liquid injection hole.

6. An end cap according to claim 5, wherein the circumferential side surface of the sealing element, which faces away from the pressure relief hole, is provided with an external thread, and the hole wall of the liquid injection hole is provided with an internal thread matched with the external thread.

7. An end cap according to any one of claims 1 to 6, wherein a limiting part is provided on the top cover plate, the limiting part extends around the circumferential direction of the liquid injection hole, and the sealing element can be in limiting fit with the limiting part when being fitted on the hole wall of the liquid injection hole.

8. An end cap according to any one of claims 1 to 6, wherein the sealing member is provided with a screwing portion for cooperation with a rotating tool.

9. A battery cell, comprising:

the shell is internally provided with an accommodating cavity with an opening at the end part;

the electric core assembly is accommodated in the accommodating cavity;

the end cap of any one of claims 1-8, wherein the end cap fits over the opening.

10. A battery comprising the cell of claim 9.

11. An electric device comprising the battery according to claim 10.

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