End cover assembly, battery, battery pack and electric equipment

Abstract

The invention discloses an end cover assembly, a battery, a battery pack and electric equipment, the end cover assembly comprises an end cover body, a pole, a sealing element and upper plastic, a pole mounting hole penetrating through the end cover body and a first groove located in the periphery of the pole mounting hole are formed in a first surface of the end cover body, the pole penetrates through the pole mounting hole, and the sealing element is arranged in the first groove; the sealing element is connected between the pole and the pole mounting hole in a sealing manner, the upper plastic sleeves the periphery of the pole and abuts against the first surface, the upper plastic is provided with an abutting surface abutting against the end cover body, the abutting surface is provided with a second groove, and the second groove is partially communicated with the first groove to form a gas channel; and the gas channel is communicated with the pole mounting hole and external air. According to the end cover assembly, the sealing failure problem of the sealing element can be detected through the detection equipment, so that batteries with substandard sealing performance can be prevented from being used, and the risk of safety accidents can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an end cover assembly, a battery, a battery pack and an electrical device. Background Art

[0002] The sealing of the battery is the key to determining the safety performance of the battery, and the sealing of the battery cover is the key part that determines the sealing performance of the battery. If the sealing of the battery cover fails, it will easily lead to battery leakage and air entering the battery, causing the battery to short circuit, catch fire, and explode.

[0003] In the production of batteries, pole mounting holes are usually opened on the cover body, the poles are inserted into the pole mounting holes, and the pressing block, upper plastic and cover body are connected together. In order to prevent the electrolyte from leaking to the outside and causing safety accidents, the relevant technology usually uses seals to seal the mounting holes, and uses instruments to detect the sealing performance of the seals. However, since the pressing block and the upper plastic, the upper plastic and the cover body fit very tightly, and the upper plastic has a certain elasticity, it is easy to form a false seal. As a result, during the production process of the cover, if the seal is forgotten to be assembled or there is a problem with the compression of the seal, it is difficult to detect it through the detection equipment, resulting in the long-term use of batteries with substandard sealing performance, and there is a risk of safety accidents caused by seal failure during use. Summary of the invention

[0004] The present application discloses an end cap assembly, a battery, a battery pack and an electrical device, which can prevent a false seal from being formed between a pressing block, an upper plastic and an end cap body, and can detect the problem of seal failure through a detection device, thereby preventing batteries with substandard sealing performance from being put into use for a long time, and reducing the risk of safety accidents.

[0005] In order to achieve the above objectives, in a first aspect, an embodiment of the present application discloses an end cap assembly, comprising:

[0006] An end cover body, the end cover body having a first surface along the thickness direction, a pole mounting hole and a first groove are provided on the first surface, the pole mounting hole penetrates the end cover body along the thickness direction of the end cover body, and the first groove is located at the periphery of the pole mounting hole;

[0007] A pole, the pole being inserted into the pole mounting hole;

[0008] a sealing member, the sealing member being sealingly connected between the pole and the pole mounting hole; and

[0009] An upper plastic, wherein the upper plastic sleeve is arranged on the outer periphery of the pole, and the upper plastic abuts against the first surface of the end cover body, and the side of the upper plastic abutting against the end cover body is an abutting surface, and a second groove is provided on the abutting surface, along the thickness direction of the end cover body, the openings of the first groove and the second groove face each other, and the second groove portion is connected with the first groove to form a gas channel, and the gas channel is connected with the pole mounting hole, and the gas channel is configured to connect to the outside air.

[0010] The end cap assembly provided in the embodiment of the present application forms a gas channel by staggering the first groove on the end cap body and the second groove on the upper plastic, so that the connected parts form a gas channel, so that even if the upper plastic and the end cap body are tightly fitted, no false seal will be formed. Therefore, during the production process, if the end cap assembly is not equipped with a seal or there is a problem with the compression of the assembled seal, due to the existence of the gas channel, the seal failure or missing installation problem can be detected by the detection equipment, thereby avoiding the flow of batteries with substandard sealing performance for a long time, which is conducive to reducing the risk of safety accidents. In addition, since the gas channel is connected by staggering the first groove and the second groove, the groove structure inside the gas channel can make the gas path of the gas channel longer, thereby effectively reducing the probability of external impurities and liquids entering, which is conducive to avoiding the erosion of the seal.

[0011] As an optional implementation, the first groove is at least partially located outside the upper plastic, so that the gas channel is connected to the outside air; or,

[0012] The second groove passes through the outer peripheral surface of the upper plastic so that the gas channel is connected to the outside air.

[0013] In this way, compared with the manner in which both the first groove and the second groove are connected to the outside air, the gas passage is connected to the outside air by the manner in which the first groove or the second groove are each connected to the outside air. This can reduce the opening of the gas passage connecting to the outside air, and thus help to block large particles of external impurities from entering the gas passage, thereby avoiding the occurrence of large particles of impurities blocking the gas passage.

[0014] As an optional embodiment, the first groove is at least partially located outside the upper plastic, and along the thickness direction of the end cover body, the depth of the first groove is less than the depth of the second groove; or,

[0015] When the second groove passes through the outer peripheral surface of the upper plastic, along the thickness direction of the end cover body, the depth of the first groove is greater than the depth of the second groove.

[0016] By setting the depth relationship between the first groove and the second groove, the opening of the gas channel connecting with the outside air is further reduced, which is beneficial to further block large particles of impurities; and the impurities entering the gas channel are made smaller in size than the depth of the first groove and the second groove, thereby further avoiding the occurrence of external impurities blocking the gas channel.

[0017] As an optional embodiment, when the first groove is at least partially located outside the upper plastic, a blocking portion is provided on one side edge of the first groove connected to the outside air, and the blocking portion is configured to block at least part of the opening of the first groove on the first surface; or,

[0018] When the second groove passes through the outer peripheral surface of the upper plastic, a blocking portion is provided at the edge of the second groove located at the abutting surface, and the blocking portion is configured to block at least part of the opening of the second groove on the side wall surface of the upper plastic.

[0019] By providing a blocking portion at the edge of the outermost first groove or the second groove connected to the outside air, the size of impurities entering the gas channel can be further limited, which is beneficial to further avoid the situation where the gas channel is blocked by external impurities.

[0020] As an optional implementation, the first direction is the direction in which the pole mounting hole points to the edge of the end cover body.

[0021] As an optional implementation, the first groove extends along a first direction, and the second groove is located at an edge of the abutting surface and passes through the edge of the abutting surface; or,

[0022] The second groove extends along a first direction, the first groove is arranged at an edge of the upper plastic, and at least a portion of the first groove is located outside the edge of the upper plastic.

[0023] The first groove or the second groove is extended along the first direction, that is, the first groove or the second groove is set as a long strip groove. Compared with the method of setting the first groove and the second groove as long strip grooves at the same time, a single long strip groove can reduce the impact on the structural strength of the end cover body or the upper plastic, and avoid the structural strength of the end cover assembly at the gas channel. Weakened weakening, thereby preventing the end cover assembly as a whole from being subjected to a large force transmitted by the pole during assembly or welding, causing the end cover body to deform or break and fail.

[0024] As an optional implementation, the first groove includes a plurality of first groove bodies, and the plurality of first groove bodies are sequentially spaced apart along the first direction;

[0025] The second groove includes a plurality of second groove bodies, which are sequentially arranged at intervals along the first direction, and portions of each second groove body are staggered with the corresponding first groove body along the first direction, and portions of each second groove body connected with the corresponding first groove body together form the gas channel;

[0026] By adopting a method of staggered arrangement of multiple first slots and multiple second slots to form a gas channel, the gas path of the gas channel can be made longer through the cooperation between the multiple first slots and multiple second slots, thereby reducing the probability of foreign impurities and liquids entering, thereby helping to avoid erosion of the seal and further avoiding the blockage of the gas channel by foreign impurities. In addition, since pressure needs to be applied to the upper plastic when assembling the upper plastic, the upper plastic is prone to deformation, or, when baking the end cover assembly, the upper plastic is prone to heat expansion, causing the upper plastic to re-cover the gas channel, thereby causing the gas channel to be sealed and fail. The gas channel is formed by staggered arrangement of multiple first slots and multiple second slots, and the cooperation between the multiple first slots and multiple second slots can reduce the degree of deformation or expansion of the upper plastic, thereby avoiding the blockage and failure of the gas channel.

[0027] As an optional implementation, a first rib is formed between two adjacent first grooves, and a projection of the first rib on the abutting surface is located in the second groove; and

[0028] A second rib is formed between two adjacent second slots, and a projection of the second rib on the first surface is located in the first slot.

[0029] By adopting this embodiment, on the one hand, the first rib and the second rib formed can avoid the stress concentration phenomenon of the end cap body and the upper plastic at the first slot body and the second slot body, and the first rib and the second rib can support and cooperate at the first slot body and the second slot body, so as to avoid the deformation or fracture failure of the end cap body caused by the large force transmitted by the pole as a whole of the end cap assembly during assembly or welding. On the other hand, during the use of the battery, the pressure inside the shell will increase or decrease, causing the end cap assembly to bulge, dent, and other breathing-like deformations, so that the end cap body or the upper plastic is thinned or the structural strength is fragile, and the creep fatigue is more obvious. By setting the first rib and the second rib, it is possible to avoid the first slot body and the second slot body being too large, thereby reducing the influence of the first slot body and the second slot body on the structural strength of the end cap body and the upper plastic, and thus helping to avoid the formation of fracture induction at the first slot body and the second slot body.

[0030] As an optional implementation manner, along the first direction, the ratio of the width of the first rib to the width of the first groove body is 0.3-0.5; and / or,

[0031] The ratio of the width of the second rib to the width of the second slot is 0.3-0.5.

[0032] By setting the width ratio of the first rib position to the first groove body and the width ratio of the second rib position to the second groove body at 0.3-0.5, the first rib position and the second rib position can have better supporting strength at the first groove body and the second groove body. In this way, the influence of the first groove body and the second groove body on the structural strength of the end cover body and the upper plastic can be reduced, avoiding the situation where the end cover body and the upper plastic are easily induced to fracture due to the opening of the first groove body and the second groove body.

[0033] As an optional embodiment, the projection of the second rib on the first surface divides the first groove body into a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are sequentially arranged along the first direction, the projection of the first rib on the abutting surface divides the second groove body into a third connecting portion and a fourth connecting portion, the third connecting portion and the fourth connecting portion are sequentially arranged along the first direction, the first connecting portion is connected to the fourth connecting portion, and the second connecting portion is connected to the third connecting portion;

[0034] Among the plurality of first grooves, the first groove closest to the outer peripheral side of the upper plastic is at least partially located outside the upper plastic, and along the first direction, the width of the first connecting portion is smaller than the width of the second connecting portion, and the width of the third connecting portion is larger than the fourth connecting portion; or,

[0035] Among the plurality of second grooves, the second groove closest to the outer peripheral side of the upper plastic penetrates the edge of the abutting surface. Along the first direction, the width of the first connecting portion is greater than the width of the second connecting portion, and the width of the third connecting portion is less than the fourth connecting portion.

[0036] In this way, by setting the width of the first connecting part of the first groove body connected to the outside to be smaller than the width of the second connecting part, or the width of the third connecting part of the second groove body connected to the outside to be smaller than the fourth connecting part, the opening of the gas channel connecting to the outside in the first groove body and the second groove body is smaller, which can further limit the size of impurities entering the inside of the gas channel, which is beneficial to further avoid the occurrence of external impurities blocking the gas channel.

[0037] As an optional implementation, the pole mounting hole is a circular hole, the first direction and the second direction are both radial directions of the pole mounting hole on the first surface, and the second direction is perpendicular to the first direction.

[0038] As an optional implementation, along the first direction, the widths of the plurality of first slots decrease sequentially; and / or,

[0039] Along the first direction, the widths of the plurality of second slots decrease sequentially; and / or,

[0040] Along the thickness direction of the end cover body, the depths of the plurality of first grooves decrease sequentially; and / or,

[0041] Along the thickness direction of the end cover body, the depths of the plurality of second grooves decrease sequentially; and / or,

[0042] Along the second direction, the widths of the plurality of first slots decrease in sequence; and / or,

[0043] Along the second direction, the widths of the plurality of second slots decrease sequentially.

[0044] Since the dimensions of the plurality of first slot bodies and the plurality of second slot bodies in the first direction, the second direction and the thickness direction of the end cover body respectively decrease gradually along the direction in which the gas channel is connected to the outside, the dimensions of the first slot body and the second slot body closest to the upper plastic edge are the smallest, which is beneficial to further reduce the opening of the gas channel connected to the outside air, and make the inner side of the gas channel larger than the outer side, thereby further facilitating the occurrence of the situation in which the gas channel is blocked by external impurities.

[0045] As an optional implementation, along the first direction, the width ratio of the second slot body to the first slot body is 1.2-1.5; and / or,

[0046] The first slot body and the second slot body are strip-shaped slots. The lengths of the first slot body and the second slot body extend along the second direction. Along the second direction, the length ratio of the second slot body to the first slot body is 1.2-1.5.

[0047] By setting the width ratio and length ratio of the second slot body to the first slot body, on the one hand, the second slot body and the first slot body can have more interlaced space, so that the gas channel has sufficient circulation space, which is conducive to ensuring that helium can flow if the seal fails during helium inspection; on the other hand, by setting the ratio, the area of ​​the second slot body and the first slot body is avoided from being misaligned, thereby reducing the suspended area of ​​the contact surface between the upper plastic and the end cover body, which is conducive to reducing the occurrence of fracture induction caused by stress concentration at the second slot body and the first slot body. In addition, since the end cover body is subjected to greater force during assembly, the first slot body is set smaller than the second slot body, so that the width of the first rib position is greater than the second rib position, further avoiding the occurrence of fracture induction in the end cover body.

[0048] As an optional embodiment, the gas channel includes a first sub-channel and a second sub-channel connected to the first sub-channel, the first sub-channel is formed on the side of the upper plastic adjacent to the pole mounting hole, and the first sub-channel is connected to the pole mounting hole, and the connecting part of the first groove and the second groove forms the second sub-channel, and the second sub-channel is configured to be connected to the outside air. The pole mounting hole is connected to the first groove and the second groove to form a second sub-channel through the first sub-channel, thereby realizing the connection between the gas channel and the pole mounting hole, so that in helium detection, if the seal fails, the helium can flow out through the pole mounting hole through the gas channel and be detected by the instrument, thereby avoiding the long-term use of batteries with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0049] As an optional embodiment, the end cover body is provided with a first step surface on one side close to the pole mounting hole, and the upper plastic is provided with a second step surface corresponding to the first step surface, and the first step surface and the second step surface are gap-matched to form the first sub-channel. By setting the gap-matched between the first step surface and the second step surface to form the first sub-channel, it is possible to avoid setting an additional structure to form the first sub-channel, which is conducive to reducing the impact on the structural strength of the end cover body and the upper plastic; and, the structure of the end cover body and the upper plastic is made simpler, thereby facilitating the production and processing of the end cover body and the upper plastic.

[0050] As an optional embodiment, a sink groove is further provided on the first surface, the sink groove is adjacent to the pole mounting hole and communicated with the pole mounting hole, and the inner wall surface of the sink groove, the bottom surface of the sink groove and the inner wall surface of the pole mounting hole jointly form the first step surface;

[0051] The abutting surface is provided with a first convex portion and a second convex portion, the first convex portion and the second convex portion are sequentially arranged in the direction from the center of the pole mounting hole to the edge of the abutting surface, the first convex portion at least partially extends into the pole mounting hole, the second convex portion is connected to the recessed groove, and the side surface of the first convex portion, the end surface of the second convex portion and the side surface of the second convex portion are sequentially connected to form the second step surface together. In this way, through the cooperation of the first step surface formed by the recessed groove and the pole mounting hole and the second step surface formed by the first convex portion and the second convex portion, on the one hand, the upper plastic and the end cover body can be aligned and connected, avoiding the need to debug and calibrate the positions of the first groove and the second groove when assembling the end cover assembly, which is beneficial to improving the assembly efficiency of the end cover assembly; on the other hand, the structure of the end cover assembly is made more compact. In addition, the first convex portion can also achieve insulation between the pole and the end cover body.

[0052] As an optional embodiment, the end cap body also has a second surface opposite to the first surface, the pole mounting hole has a first opening penetrating the first surface, and a second opening penetrating the second surface, the seal is sealed at the second opening, and the first sub-channel is connected to the first opening. Since the seal and the first sub-channel are arranged at both ends of the pole mounting hole, the first sub-channel will not pass through the position of the seal, and it is ensured that the first sub-channel can be connected to the second sub-channel from the seal, and then in the helium detection, if the seal is not invalid, the helium will not flow out through the gas channel; if the seal fails, the helium can flow out through the pole mounting hole through the gas channel and be detected by the instrument, thereby realizing the detection of whether the end cap assembly is equipped with a seal or whether there is a problem with the compression of the seal, which is conducive to avoiding the influx of batteries with substandard sealing performance for a long time, and thus helping to reduce the risk of safety accidents.

[0053] As an optional implementation, a first guide groove is provided on the inner wall surface of the pole mounting hole, the first guide groove extends along the thickness direction of the end cover body, and the first guide groove is connected to the second sub-channel;

[0054] and / or,

[0055] A first convex portion is provided on the abutting surface, the first convex portion at least partially extends into the pole mounting hole, the first convex portion is configured to separate the end cover body and the pole, a second guide groove is provided on the side surface of the first convex portion, the second guide groove extends along the thickness direction of the end cover body, and the second guide groove is connected to the second sub-channel;

[0056] Wherein, the first guide groove and / or the second guide groove form the first sub-channel.

[0057] The method of forming the first sub-channel by the first guide groove and the second guide groove can avoid the false sealing of the end cover assembly caused by the lack of a fitting gap between the upper plastic and the end cover body or the fitting gap being blocked, which is beneficial to improving the accuracy of false sealing detection and avoiding the influx of batteries with substandard sealing performance for a long time, thereby helping to reduce the risk of safety accidents.

[0058] As an optional embodiment, the end cover body further has a second surface opposite to the first surface, the pole mounting hole has a first opening penetrating the first surface, and a second opening penetrating the second surface, and the sealing member is sealed at the second opening;

[0059] When the first guide groove forms the first sub-channel, the first guide groove is connected to the first opening; and / or,

[0060] When the second guide groove forms the first sub-channel, the second guide groove is connected to the first opening.

[0061] Since the first guide groove, the second guide groove and the seal are arranged at both ends of the pole mounting hole, the first sub-channel can be prevented from passing through the seal, and the first sub-channel can be connected to the second sub-channel from the seal, thereby ensuring that during helium detection, if the seal has not failed, the helium will not flow out through the gas channel; if the seal fails, the helium can flow out through the pole mounting hole through the gas channel and be detected by the instrument, thereby realizing the detection of whether the end cover assembly is equipped with a seal or whether there is a problem with the compression amount of the seal, which is beneficial to avoid the long-term use of batteries with substandard sealing performance, and thus helps to reduce the risk of safety accidents.

[0062] As an optional embodiment, a plurality of first grooves are provided, and the plurality of first grooves are arranged at intervals around the center of the pole mounting hole, and a plurality of second grooves are provided corresponding to the plurality of first grooves, and each second groove is respectively connected with the corresponding first groove portion to form a plurality of gas channels. The plurality of gas channels are provided on the end cap assembly, which can avoid the situation where a single gas channel is blocked and causes a false seal of the end cap assembly, thereby facilitating the improvement of the accuracy of false seal detection, and facilitating the prevention of the influx of batteries with substandard sealing performance for a long time, thereby facilitating the reduction of the risk of safety accidents.

[0063] In a second aspect, the present application also discloses a battery, comprising a housing and an end cap assembly as described in the first aspect, wherein the housing has an opening, and the end cap assembly is configured to close the opening. The battery having the end cap assembly of the first aspect can also detect the problem of seal failure through a detection device, thereby preventing batteries with substandard sealing performance from being used for a long time, which is conducive to reducing the risk of safety accidents.

[0064] In a third aspect, the present application also discloses a battery pack, including the battery as described in the second aspect. The battery pack having the battery of the second aspect also has the end cap assembly of the first aspect, which can also detect the problem of seal failure through the detection equipment, thereby avoiding the flow of battery packs with substandard sealing performance for a long time into use, which is conducive to reducing the risk of safety accidents.

[0065] In a fourth aspect, an embodiment of the present application further discloses an electrical device, comprising a battery as described in the second aspect above or a battery pack as described in the third aspect above.

[0066] Compared with the prior art, the beneficial effects of this application are:

[0067] The end cap assembly, battery, battery pack and electrical equipment provided in the embodiments of the present application, the end cap assembly is provided with a first groove on the end cap body, and a second groove on the upper plastic, and the first groove and the second groove are staggered to form a gas channel. Thus, the gas channel can be constructed so that the two sides of the end cap body are connected when the seal fails. In this way, during the production process of the battery, if the seal is forgotten to be assembled or there is a problem with the compression amount of the seal, due to the existence of the gas channel, even if the pressing block, the upper plastic and the end cap body are tightly fitted, a false seal will not be formed, so that the failure of the seal or the missing installation problem can be detected by the detection equipment, thereby avoiding the long-term use of batteries with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0068] In addition, since the gas channel is connected by staggered arrangement of the first groove and the second groove, the gas path of the gas channel can be made longer, thereby reducing the probability of foreign impurities and liquids entering, which is beneficial to avoid erosion of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0070] Figure 1is a schematic structural diagram of an end cap assembly provided in an embodiment of the present application;

[0071] Figure 2 It is a schematic diagram of the structural decomposition of the end cover assembly provided in an embodiment of the present application from one perspective;

[0072] Figure 3 is a schematic diagram of the structural decomposition of the end cover assembly provided in an embodiment of the present application from another perspective;

[0073] Figure 4 yes Figure 1 Schematic diagram of the cross section at AA in the middle;

[0074] Figure 5 yes Figure 4 A schematic diagram of the structure in which the gas channel at B is connected to the outside air;

[0075] Figure 6 It is a structural schematic diagram of a gas passage provided in an embodiment of the present application, in which a blocking portion is provided at the opening of the gas passage;

[0076] Figure 7 is a schematic diagram of the structure of a gas channel provided in an embodiment of the present application;

[0077] Figure 8 yes Figure 2 The plane diagram at A in the middle;

[0078] Fig. 9 It is a schematic plan view of the plastic upper provided in an embodiment of the present application;

[0079] Fig.10 is a schematic diagram of the structure of another gas channel provided in an embodiment of the present application;

[0080] Fig.11 It is a structural schematic diagram of the width and length ratio of the second trough body and the first trough body provided in an embodiment of the present application;

[0081] Fig.12 is a schematic diagram of the arrangement structure of the first tank body provided in an embodiment of the present application;

[0082] Fig.13 It is a structural schematic diagram of the communication mode between the first tank body and the second tank body provided in an embodiment of the present application;

[0083] Fig.14 It is a schematic diagram of the structure of the opening in which the gas channel provided in the embodiment of the present application is connected to the outside;

[0084] Fig.15 It is a schematic diagram of the length and width changes of the first trough body and the second trough body provided in an embodiment of the present application;

[0085] Fig.16is a schematic diagram of depth variation of the first trough body and the second trough body provided in an embodiment of the present application;

[0086] Fig.17 is a structural schematic diagram of a first sub-channel provided in an embodiment of the present application;

[0087] Fig.18 is a cross-sectional schematic diagram of an end cap assembly provided in an embodiment of the present application;

[0088] Fig.19 is another structural schematic diagram of the first sub-channel provided in an embodiment of the present application;

[0089] Fig. 20 is another structural schematic diagram of the first sub-channel provided in an embodiment of the present application;

[0090] Fig.21 It is a schematic structural diagram of an end cover body of multiple gas channels provided in an embodiment of the present application;

[0091] Fig. 22 It is a schematic diagram of the structure of the upper plastic of multiple gas channels provided in an embodiment of the present application;

[0092] Fig.23 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0093] Fig.24 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0094] Fig.25 It is a schematic diagram of the structure of the electrical equipment provided in the embodiment of the present application.

[0095] Description of reference numerals:

[0096] 100-end cover assembly; 1-end cover body; M-first surface; N-second surface; 11-pole mounting hole; 111-inner wall surface of pole mounting hole; 11a-first opening; 11b-second opening; 112-first guide groove; 12-first groove; 121-first groove body; 122-first rib position; 123-first connecting part; 124-second connecting part; 13-sunk groove; 131-inner wall surface of the sink groove; 132-bottom surface of the sink groove; D1-first step surface; 14-explosion-proof hole; 141-explosion-proof valve protection sheet; 142-explosion-proof valve; 15-auxiliary cover body; 151-through hole; 152-explosion-proof valve fence; 2-pole; 3-seal; 4-upper plastic; O-butt surface; 41 -second groove; 411-second groove body; 412-second rib position; 413-third connecting part; 414-fourth connecting part; 42-first convex part; 421-side surface of the first convex part; 422-second guide groove; 43-second convex part; 431-end surface of the second convex part; 432-side surface of the second convex part; D2-second step surface; 44-installation groove; 5-pressing block; 6-gas channel; 61-blocking part; 62-first sub-channel; 63-second sub-channel; X-first direction; Y-second direction; Z-thickness direction; 200-battery; 201-shell; 202-opening; 300-battery pack; 400-electrical equipment; 401-electric energy conversion device; 402-user load. DETAILED DESCRIPTION

[0097] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0098] In this application, the terms "upper", "lower", "bottom", "inner", "outer" and the like indicate positions or location relationships based on the positions or location relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0099] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0100] In addition, the terms "installed", "set", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0101] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0102] Before explaining the technical solution of the present application, the inventive concept of the present application is first explained.

[0103] The sealing of the battery cover determines the key to the safety performance of the battery. If the sealing of the battery cover fails, it is easy to cause battery leakage and air to enter the battery, which may cause the battery to short-circuit, catch fire, and explode. Therefore, in the production of batteries, the battery cover needs to seal the pole mounting hole of the battery cover through a seal, and the sealing performance is checked by helium inspection. In the production process of the battery cover, a pole mounting hole is usually opened on the cover body, the pole is inserted into the pole mounting hole, and the pressing block, the upper plastic and the cover body are connected together. However, since the pressing block and the upper plastic, the upper plastic and the cover body fit very tightly, and the upper plastic has a certain elasticity, it is easy for the battery cover to form a false seal. This will lead to the production process of the battery cover. If the seal is forgotten to be assembled or there is a problem with the compression of the seal, it is difficult to detect it through the detection equipment, resulting in the long-term use of batteries with substandard sealing performance, and there is a risk of safety accidents caused by sealing failure during use.

[0104] To solve the above problems, the inventors tried to avoid the formation of false seals on the battery cover by setting up a gas channel. Specifically, a guide groove is opened on the upper plastic or on the cover body, and the battery cover is connected from the seal to the outside of the battery cover through the guide groove, so that the gas can flow. In this way, in the process of checking the air tightness of the battery cover by helium, if the battery cover is not equipped with a seal, or the compression amount of the assembled seal is problematic, the helium will flow from the inside of the battery cover through the guide groove to the other side of the battery cover and be detected by the instrument, thereby realizing the detection of battery covers with substandard sealing performance.

[0105] However, the inventors have discovered through research that when the guide groove is opened in a straight line or an arc shape, during use, external impurities and liquids can easily pass through the guide groove directly into the position of the seal, causing blockage of the guide groove and corrosion of the seal, thereby causing failure of the guide groove or the seal, and thus posing a risk of causing safety accidents.

[0106] In view of this point, the embodiment of the present application provides an end cap assembly, because the end cap body is provided with a first groove, the upper plastic is provided with a second groove, and the first groove and the second groove are partially staggered, so that the first groove and the second groove are partially connected, and the connected part can form a gas channel, so that the failure of the seal can be detected by the detection equipment. At the same time, because the first groove and the second groove are partially staggered, the gas channel is formed into a baffle channel, which is conducive to avoiding the erosion of the seal.

[0107] Specifically, the present application discloses an end cap assembly, a battery, a battery pack and an electrical device. The end cap assembly can be applied to a battery to seal at least one end opening of the battery shell. Exemplarily, the end cap assembly can be applied to a cylindrical battery or a square battery. For example, when the battery is a cylindrical battery, the end cap assembly can be connected to one end opening of the cylindrical shell of the cylindrical battery. At the same time, the end cap body of the end cap assembly can adopt, for example, a circular cover plate to adapt to the cylindrical shell of the cylindrical battery. When the battery is a square battery, the end cap assembly can be connected to one end opening of the square shell of the square battery. At the same time, the end cap body of the end cap assembly can adopt, for example, a square cover plate to adapt to the square shell. It can be seen that the end cap assembly of the present application can be applied to both square batteries and cylindrical batteries. The specific selection can be based on actual conditions, and this embodiment does not specifically limit this.

[0108] In order to facilitate the explanation of the specific structure of the end cover assembly, the technical solution of the present application will be further explained below in combination with the embodiments and drawings. For ease of understanding, this embodiment will be explained by taking the battery as a cylindrical battery as an example.

[0109] See also Figures 1 to 4 , Figure 1 is a schematic structural diagram of an end cap assembly provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the structural decomposition of the end cover assembly provided in an embodiment of the present application from one perspective; Figure 3 is a schematic diagram of the structural decomposition of the end cover assembly provided in an embodiment of the present application from another perspective; Figure 4 yes Figure 1A cross-sectional schematic diagram at AA in the middle. In the first aspect, the embodiment of the present application provides an end cap assembly 100, including an end cap body 1, a pole 2, a seal 3, and an upper plastic 4. The end cap body 1 has a first surface M along a thickness direction Z, and a pole mounting hole 11 and a first groove 12 are provided on the first surface M. The pole mounting hole 11 penetrates the end cap body 1 along the thickness direction Z of the end cap body 1, and the first groove 12 is located at the periphery of the pole mounting hole 11. The pole 2 is penetrated in the pole mounting hole 11, and the seal 3 is connected to the pole 2 and the pole mounting hole 11. The upper plastic 4 is sleeved on the outer periphery of the pole 2 between the mounting holes 11, and the upper plastic 4 abuts against the first surface M of the end cover body 1. The side of the upper plastic 4 abutting against the end cover body 1 is the abutting surface O, and a second groove 41 is provided on the abutting surface O. Along the thickness direction Z of the end cover body 1, the openings of the first groove 12 and the second groove 41 face each other, and the second groove 41 is partially connected with the first groove 12 to form a gas channel 6. The gas channel 6 is connected with the pole mounting hole 11, and the gas channel 6 is configured to be connected to the outside air.

[0110] The end cap assembly provided in the embodiment of the present application is partially staggered by the first groove 12 on the end cap body 1 and the second groove 41 on the upper plastic 4, so that the connected part forms a gas channel 6, so that even if the upper plastic and the end cap body are tightly fitted, no false seal will be formed. Therefore, during the production process, if the end cap assembly 100 is not equipped with the seal 3 or the assembled seal 3 has a problem with the compression amount, due to the existence of the gas channel 6, the failure or missing of the seal 3 can be detected by the detection equipment, thereby avoiding the long-term use of batteries with substandard sealing performance, which is conducive to reducing the risk of safety accidents. In addition, since the gas channel 6 is connected by staggering the first groove and the second groove, the groove structure inside the gas channel 6 can make the gas path of the gas channel longer, thereby reducing the probability of external impurities and liquids entering, which is conducive to avoiding the erosion of the seal 3.

[0111] It is understandable that the sealing member 3 includes a sealing ring, a gasket, etc., which is not limited in this embodiment. Figure 2 and Figure 3 As shown, the seal 3 can be configured as a sealing ring, which can better wrap the pole 2 so that the sealing ring and the pole 2 fit more closely, thereby facilitating improving the sealing effect.

[0112] Optionally, the material of the seal 3 includes a material with elasticity and resilience, and with appropriate mechanical strength and stable performance, such as silicone and rubber, which is not limited in this embodiment. Exemplarily, by setting the seal 3 to be a rubber material, the seal 3 has a certain corrosion resistance and fatigue resistance, which is conducive to improving the service life of the seal 3, and further conducive to improving the long-term sealing performance of the end cover assembly 100.

[0113] It is understandable that the material of the upper plastic 4 can be insulating materials such as plastic, rubber, silicone, etc., or can be a material containing a small amount of conductive agent, which is not limited in this embodiment.

[0114] Optionally, when the pole 2 is a negative output, the upper plastic 4 is a negative upper plastic, and the material of the negative upper plastic is set to be an insulating material. Since the battery shell is generally made of metal material, in order to improve the corrosion resistance and oxidation resistance of the shell, the shell is generally made positively charged, and the present application connects the end cover body 1 with the shell so that the end cover body 1 forms a positive output, and the pole 2 is a negative output. Therefore, the pole 2 penetrating the end cover body 1 needs to be insulated from the end cover body 1 by the negative upper plastic.

[0115] Optionally, the end cap assembly 100 also includes a positive pole, and the upper plastic 4 may include a positive pole upper plastic and a negative pole upper plastic. The positive pole upper plastic is sleeved on the positive pole, and the material of the positive pole upper plastic can be set to a material containing a small amount of conductive agent, and the material of the negative pole upper plastic is set to an insulating material; or, the material of the positive pole upper plastic can be set to an insulating material, and the material of the negative pole upper plastic is set to an insulating material. As can be seen from the foregoing, the shell of the battery is generally made of metal material and is positively charged, and the present application connects the end cap body 1 to the shell, and the pole 2 is a negative pole output. Therefore, it is necessary to insulate the pole 2 passing through the end cap body 1 from the end cap body 1 through the negative pole upper plastic. Since both the end cap body 1 and the positive pole are positively charged, the positive pole upper plastic and the positive pole can be set to be electrically connected or insulated.

[0116] Optionally, the end cap assembly 100 further includes a pressing block 5, which is sleeved on the outer periphery of the pole 2, and the upper plastic 4 is provided with a mounting groove 44 in the thickness direction Z toward the end cap body 1, and the pressing block 5 abuts against the mounting groove 44 in the thickness direction Z of the end cap body 1. The pressing block 5 can increase the contact area between the pole 2 and the external electrical connection components; and the mounting groove 44 can better isolate the pressing block 5 from the end cap body 1, which is conducive to improving the insulation effect between the positive output and the negative output.

[0117] It can be understood that the end cover body 1 also has a second surface (not shown) away from the first surface M in the thickness direction Z, the pole mounting hole 11 has a first opening 11a penetrating the first surface M, and a second opening (not shown) penetrating the second surface, and the seal 3 is sealed at the second opening. When the end cover body 1 is connected to the battery housing, the first surface M and the first opening 11a face the outside of the battery, and the second surface and the second opening face the inside of the battery.

[0118] As an optional implementation, Figure 2 and Figure 3As shown, the end cover assembly 100 also includes an auxiliary cover body 15, the auxiliary cover body 15 has a surface abutting against the end cover body 1 on the side away from the first surface M along the thickness direction Z of the end cover body 1, the second surface N is the surface of the auxiliary cover body 15 on the side away from the end cover body 1, the auxiliary cover body 15 includes a through hole 151 arranged corresponding to the pole mounting hole, and an explosion-proof valve fence 152 located on the side of the through hole 151, the through hole 151 passes through the auxiliary cover body 15 along the thickness direction Z of the end cover body 1, the through hole 151 is connected to the pole mounting hole 11, and the second opening 11b is the through hole 151 away from the end The opening on one side of the cover body 1, the sealing member 3 is sealed at the second opening 11b, and the explosion-proof valve fence 152 is configured to reduce the pressure inside the battery when the pressure inside the battery reaches the bursting pressure; the end cover body 1 is also provided with an explosion-proof hole 14 located on the peripheral side of the pole mounting hole 11 corresponding to the explosion-proof valve fence 152, and the explosion-proof hole 14 penetrates the end cover body 1 along the thickness direction Z of the end cover body 1; the explosion-proof hole 14 is covered with an explosion-proof valve protection sheet 141 and an explosion-proof valve 142, the explosion-proof valve protection sheet 141 is located on the first surface M, and the explosion-proof valve 142 is arranged between the end cover body 1 and the auxiliary cover body 15.

[0119] In this way, the auxiliary cover body 15 can provide a certain support force to the end cover body 1, so as to avoid deformation and fatigue of the end cover body 1 caused by changes in the internal pressure of the shell during the use of the battery, which may easily lead to the end cover body 1 breaking or serious deformation and failure. In addition, the auxiliary cover body 15 can provide a setting position for the explosion-proof valve fence 152; the explosion-proof valve protection sheet 141 and the explosion-proof valve 142 can ensure the sealing of the end cover assembly 100 on the one hand; on the other hand, the explosion-proof valve protection sheet 141 provides protection for the explosion-proof valve 142 to prevent the explosion-proof valve 142 from being corroded. In addition, the explosion-proof valve fence 152 can further provide protection for the explosion-proof valve 142.

[0120] The structure of the gas channel of the present application will be described in detail below with reference to the accompanying drawings.

[0121] In one example, both the first groove and the second groove may be a single groove.

[0122] In another example, both the first groove and the second groove can be multiple grooves (this part will be described in detail later).

[0123] When there is only one first groove and second groove, the first groove may be a strip groove and extend from the center of the pole mounting hole to the edge of the upper plastic (i.e., the first direction). Alternatively, the second groove may be a strip groove and extend from the center of the pole mounting hole to the edge of the upper plastic. When the first groove is a strip groove, the second groove only needs to be partially connected to the first groove, and the second groove may be a circular groove or a strip groove. Conversely, if the second groove is a strip groove, the first groove only needs to be partially connected to the second groove, and in this case, the first groove may be a circular groove or a strip groove.

[0124] See also Figure 5 , Figure 5 yes Figure 4 Schematic diagram of the structure in which the gas channel at B is connected to the outside air. Optionally, the connection between the gas channel 6 and the outside air can be implemented in a variety of ways, for example, the connection with the outside air is achieved through the first groove, or the connection with the outside air is achieved through the second groove, or the connection with the outside air is achieved through both the first groove and the second groove. They will be introduced below.

[0125] In one example, Figure 5 As shown in (a), when the first groove 12 is used to connect to the outside air, the first groove 12 can be at least partially located outside the upper plastic 4 so that the gas channel 6 is connected to the outside air.

[0126] In another example, Figure 5 As shown in (b) in FIG. 1 , when the second groove 41 is used to connect to the outside air, the second groove 41 can penetrate the outer peripheral surface of the upper plastic 4 so that the gas channel 6 is connected to the outside air.

[0127] In another example, Figure 5 As shown in (c), when the first groove 12 and the second groove 41 are used together to connect to the outside air, the first groove 12 can be at least partially located outside the upper plastic 4, and the second groove 41 passes through the outer circumferential surface of the upper plastic 4, so that the gas channel 6 is connected to the outside air.

[0128] In the above-mentioned various examples, the gas channel 6 is connected to the outside air by connecting the first groove 12 or the second groove 41 to the outside air, which can avoid the need to set up an additional air guide channel to connect the gas channel 6 to the outside air, and is conducive to reducing the manufacturing process of the end cover assembly 100. In addition, compared with the method in which both the first groove 12 and the second groove 41 are connected to the outside air, the method in which the first groove 12 or the second groove 41 is connected to the outside air is also conducive to reducing the opening of the gas channel 6 connected to the outside air, thereby helping to prevent large particles of foreign impurities from entering the gas channel 6, and avoiding the occurrence of large particles of impurities blocking the gas channel 6.

[0129] Considering that the gas channel 6 needs to be connected to the outside air, there may be a risk that external liquid and impurities enter the gas channel 6, and then enter the pole mounting hole 11 through the gas channel 6 and even contact the above-mentioned seal 3. Based on this, the present application also designs a solution to reduce the entry of external liquid and impurities into the gas channel, as shown below:

[0130] In some possible implementations, the depth relationship between the first groove 12 and the second groove 41 can be designed to reduce the inlet of the gas channel 6, thereby reducing the external liquid and impurities from entering the gas channel 6. For example, Figure 5 As shown in (a) of FIG. 1 , if the first groove 12 is connected to the outside air, the depth of the first groove 12 can be made smaller than the depth of the second groove 41, that is, along the thickness direction Z of the end cover body 1, the depth of the first groove 12 is smaller than the depth of the second groove 41. For another example, Figure 5 As shown in (b), if the second groove 41 is connected to the outside air, the depth of the second groove 41 can be made smaller than the depth of the first groove 12. That is, along the thickness direction Z of the end cover body 1, the depth of the first groove 12 is greater than the depth of the second groove 41.

[0131] By setting the depth relationship between the first groove 12 and the second groove 41, the opening of the gas channel 6 connecting with the outside air is further reduced, which is beneficial to further block large particles of impurities; and the size of impurities entering the gas channel 6 is made smaller than the depth size of the first groove 12 and the second groove 41, thereby further avoiding the occurrence of external impurities blocking the gas channel 6.

[0132] See also Figure 6 , Figure 6 6 is a schematic diagram of a structure in which a blocking portion is provided at the opening of a gas channel according to an embodiment of the present application. In some possible implementations, a blocking portion 61 may be added to prevent external impurities from entering the gas channel 6. For example, Figure 6As shown in (a) of FIG. 1 , if the first groove 12 is connected to the outside air, a blocking portion 61 may be provided on one side edge of the first groove 12 connected to the outside air, and the blocking portion 61 is configured to block at least part of the opening of the first groove 12 on the first surface M. For another example, Figure 6 As shown in (b), if the second groove is connected to the outside air, a blocking portion 61 can be provided at the edge of the second groove 41 at the abutting surface O, and the blocking portion 61 is configured to block at least part of the opening of the second groove 41 on the side wall surface of the upper plastic 4.

[0133] By providing a blocking portion 61 at the edge of the outermost first groove 12 or the second groove 41 connected to the outside air, the size of impurities entering the gas channel 6 can be further limited, which is beneficial to further avoid the situation where the gas channel 6 is blocked by external impurities.

[0134] Optionally, as can be seen from the foregoing, the first groove 12 and the second groove 41 can be one or more. When the first groove 12 and the second groove 41 are one or more, the way in which they communicate with the outside air can also be considered.

[0135] Please combine Figure 7 , Figure 7 is a schematic diagram of the structure of a gas channel provided in an embodiment of the present application. Figure 7 The first groove 12 and the second groove 41 shown in (a) are both one, the first groove 12 is a long strip groove, the first groove 12 extends along the first direction X, and the second groove 41 is located at the edge of the abutment surface O and passes through the edge of the abutment surface O, wherein the first direction X is the pole mounting hole 11 (see Figure 2 ) points to the direction of the edge of the end cover body 1. That is, the extension length of the first groove 12 is greater than the extension length of the second groove 41.

[0136] For example, Figure 7 As shown in (b), the first groove 12 and the second groove 41 are both one, and the second groove 41 is a long strip groove, then the second groove 41 extends along the first direction X, the first groove 12 is located at the edge of the projection of the upper plastic 4 on the first surface M, and the first groove 12 is arranged near the edge of the upper plastic 4, and the first groove 12 is at least partially located outside the edge of the upper plastic 4, wherein the first direction X is the pole mounting hole 11 (see Figure 2 ) points to the direction of the edge of the end cover body 1. That is, the extension length of the second groove 41 is greater than the extension length of the first groove 12.

[0137] Compared with the method of simultaneously setting the first groove 12 and the second groove 41 as long strip grooves, the method of extending the first groove 12 or the second groove 41 along the first direction X can reduce the influence on the structural strength of the end cover body 1 or the upper plastic 4, and avoid the structural strength of the end cover assembly 100 at the gas channel 6 from being weakened, thereby avoiding the end cover assembly 100 as a whole from being subjected to a large force transmitted by the pole 2 during assembly or welding, which may cause the end cover body 1 to be deformed or fractured and fail.

[0138] The manner in which there are multiple first grooves 12 and multiple second grooves 41 will be described in detail below.

[0139] See also Figures 8 to 10 , Figure 8 yes Figure 2 The plane diagram at A in the middle; Fig. 9 It is a schematic plan view of the plastic upper provided in an embodiment of the present application; Fig.10 When the first groove 12 includes a plurality of first groove bodies 121 and the second groove 41 includes a plurality of second groove bodies 411, the plurality of first groove bodies 121 and the plurality of second groove bodies 411 may be sequentially arranged along the first direction X at intervals.

[0140] Specifically, Figures 8 to 10 As shown, the first groove 12 includes a plurality of first groove bodies 121, which are arranged in sequence along the first direction X at intervals, and the second groove 41 includes a plurality of second groove bodies 411, which are arranged in sequence along the first direction X at intervals, and along the first direction X, parts of each second groove body 411 are staggered with the corresponding first groove body 121, and the parts of each second groove body 411 connected with the corresponding first groove body 121 together form a gas channel 6; wherein the first direction X is the direction in which the pole mounting hole 11 points to the edge of the end cover body 1. By adopting a method in which the plurality of first groove bodies 121 and the plurality of second groove bodies 411 are arranged in an interlaced manner to form the gas channel 6, the gas path of the gas channel 6 can be made longer through the mutual cooperation between the plurality of first groove bodies and the plurality of second groove bodies, thereby reducing the probability of external impurities and liquids entering, thereby facilitating the sealing member 3 from being eroded, and further facilitating the occurrence of the situation in which the gas channel 6 is blocked by external impurities. In addition, since pressure needs to be applied to the upper plastic 4 when assembling the upper plastic 4, the upper plastic 4 is prone to deformation, or, when baking the end cover assembly 100, the upper plastic 4 is prone to heat expansion, causing the upper plastic 4 to re-cover the gas channel 6, thereby causing the gas channel 6 to be sealed and fail. By cooperating with the multiple first grooves 121 and the multiple second grooves 411, the degree of deformation or expansion of the upper plastic 4 can be reduced, thereby avoiding the occurrence of blockage and failure of the gas channel 6.

[0141] Since a plurality of first grooves 121 and a plurality of second grooves 411 are respectively provided on the end cover body 1 and the upper plastic 4, the plurality of first grooves 121 and the plurality of second grooves 411 may affect the structural strength of the end cover body 1 and the upper plastic 4, and thus the end cover body and the upper plastic may be at risk of breaking at the plurality of first grooves 121 and the plurality of second grooves 411. Based on this, the present application also designs a solution to avoid the plurality of first grooves 121 and the plurality of second grooves 411 from having a significant impact on the structural strength of the end cover body 1 and the upper plastic 4, as shown below:

[0142] As an optional implementation, Fig.10 As shown, a first rib 122 is formed between two adjacent first slots 121, and the projection of the first rib 122 on the abutting surface O is located in the second slot 411. Correspondingly, a second rib 412 is formed between two adjacent second slots 411, and the projection of the second rib 412 on the first surface M is located in the first slot 121. In this way, on the one hand, the first rib 122 and the second rib 412 formed can avoid the stress concentration phenomenon of the end cover body 1 and the upper plastic 4 at the first slot 121 and the second slot 411, and the first rib 122 and the second rib 412 can support and cooperate at the first slot 121 and the second slot 411, so as to avoid the deformation or fracture failure of the end cover body 1 caused by the force transmitted by the pole 2 to the end cover assembly 100 as a whole during assembly or welding. On the other hand, during the use of the battery, the internal pressure of the shell is unstable, for example, it may increase or decrease, causing the end cap assembly 100 to bulge, dent, or deform similar to breathing, so that the end cap body 1 or the upper plastic 4 is thinned or the structural strength is weak, and there is a fracture induction effect, resulting in more obvious creep fatigue. By setting the first rib position 122 and the second rib position 412, it is possible to avoid the first slot body 121 and the second slot body 411 being too large, thereby reducing the influence of the first slot body 121 and the second slot body 411 on the structural strength of the end cap body 1 and the upper plastic 4, which is conducive to avoiding the situation where the fracture induction effect is formed at the first slot body 121 and the second slot body 411.

[0143] In some possible implementations, the width ratio of the first rib 122 to the first groove 121 and the width ratio of the second rib 412 to the second groove 411 can be set to avoid the plurality of first grooves 121 and the plurality of second grooves 411 from having a significant impact on the structural strength of the end cover body 1 and the upper plastic 4.

[0144] In one example, along the first direction X, the ratio of the width of the first rib 122 to the width of the first slot 121 is 0.3-0.5, for example, it can be 0.3, 0.4, 0.5, etc.

[0145] In another example, the ratio of the width of the second rib 412 to the width of the second slot 411 is 0.3-0.5, for example, it can be 0.3, 0.4, 0.5, etc.

[0146] In another example, the ratio of the width of the first rib 122 to the width of the first groove 121 is 0.3-0.5, and the ratio of the width of the second rib 412 to the width of the second groove 411 is 0.3-0.5, that is, the ratio of the width of the first rib 122 to the width of the first groove 121 can be 0.3, 0.4, 0.5, etc., and the ratio of the width of the second rib 412 to the width of the second groove 411 can also be 0.3, 0.4, 0.5, etc. For example, the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.3, and the ratio of the width of the second rib position 412 to the width of the second groove body 411 can also be 0.3, 0.4, 0.5, etc.; or, the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.4, and the ratio of the width of the second rib position 412 to the width of the second groove body 411 can also be 0.3, 0.4, 0.5, etc.; or, the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.5, and the ratio of the width of the second rib position 412 to the width of the second groove body 411 can also be 0.3, 0.4, 0.5, etc., which is not limited to this in this embodiment.

[0147] Optionally, along the first direction X, the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.3-0.5, or the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.4-0.5, or the ratio of the width of the first rib position 122 to the width of the first groove body 121 can be 0.45-0.5, and so on. This embodiment is not limited to this.

[0148] Optionally, along the first direction X, the ratio of the width of the second rib 412 to the width of the second groove body 411 can be 0.3-0.5, or the ratio of the width of the second rib 412 to the width of the second groove body 411 can be 0.4-0.5, or the ratio of the width of the second rib 412 to the width of the second groove body 411 can be 0.45-0.5, and so on, which is not limited to this embodiment.

[0149] By setting the width ratio of the first rib 122 to the first groove body 121 and the width ratio of the second rib 412 to the second groove body 411 to 0.3-0.5, the first rib 122 and the second rib 412 can have better supporting strength at the first groove body 121 and the second groove body 411, so that the influence of the first groove body 121 and the second groove body 411 on the structural strength of the end cover body 1 and the upper plastic 4 can be reduced, and the situation that the end cover body 1 and the upper plastic 4 are easily induced to fracture due to the opening of the first groove body 121 and the second groove body 411 can be avoided.

[0150] See also Fig.11 , Fig.11 4 is a structural diagram of the width and length ratio of the second groove body and the first groove body provided in the embodiment of the present application. In some possible implementations, the influence of the plurality of first groove bodies 121 and the plurality of second groove bodies 411 on the structural strength of the end cover body 1 and the upper plastic 4 can also be reduced by designing the width of the second groove body 411 and the first groove body 121.

[0151] Optionally, the pole mounting hole 11 (see Figure 8 ) is a circular hole, the first direction X and the second direction Y are both radial directions of the pole mounting hole 11 on the first surface M, and the second direction Y is perpendicular to the first direction X.

[0152] In one example, Fig.11 As shown in (a), along the first direction X, the width ratio of the second slot body 411 to the first slot body 121 is 1.2-1.5.

[0153] In another example, Fig.11 As shown in (b), the first slot body 121 and the second slot body 411 are strip-shaped slots, and the lengths of the first slot body 121 and the second slot body 411 extend along the second direction Y. Along the second direction Y, the length ratio of the second slot body 411 to the first slot body 121 is 1.2-1.5, wherein the pole mounting hole 11 (see Figure 8 ) is a circular hole, the first direction X and the second direction Y are both radial directions of the pole mounting hole 11 on the first surface M, and the second direction Y is perpendicular to the first direction X. In another example, Fig.11 As shown in (c) in FIG. 1 , the first slot body 121 and the second slot body 411 are strip-shaped slots. The lengths of the first slot body 121 and the second slot body 411 extend along the second direction Y. In the second direction Y, the length ratio of the second slot body 411 to the first slot body 121 is 1.2-1.5, and in the first direction X, the width ratio of the second slot body 411 to the first slot body 121 is 1.2-1.5. The pole mounting hole 11 (see FIG. 1 ) Figure 8) is a circular hole, the first direction X and the second direction Y are both radial directions of the pole mounting hole 11 on the first surface M, and the second direction Y is perpendicular to the first direction X. By setting the width ratio and length ratio of the second slot body 411 and the first slot body 121, on the one hand, the second slot body 411 and the first slot body 121 can have more interlaced space, so that the gas channel 6 has sufficient circulation space, which is conducive to ensuring that helium can flow if the seal 3 fails during helium inspection; on the other hand, by setting the ratio, the area of ​​the second slot body 411 and the first slot body 121 is prevented from being misaligned, thereby reducing the area of ​​the contact surface between the upper plastic 4 and the end cover body 1, which is conducive to reducing the occurrence of fracture induction caused by stress concentration at the second slot body 411 and the first slot body 121. In addition, since the end cover body 1 is subjected to greater force during assembly, the first slot body 121 is set smaller than the second slot body 411, so that the width of the first rib position 122 is greater than the second rib position 412, further avoiding the occurrence of fracture induction of the end cover body 1.

[0154] It can be understood that when the first slot body 121 and the second slot body 411 are configured as strip-shaped slots, the second direction Y is the length direction of the first slot body 121 and the second slot body 411 .

[0155] It is understandable that the first slot body 121 and the second slot body 411 are configured as strip slots, which may be rectangular slots, elliptical slots, rounded rectangular slots, etc., and this embodiment does not limit this. In addition, the first slot body 121 and the second slot body 411 may be circular slots, square slots, etc. in addition to being strip slots, and this embodiment does not limit this.

[0156] Please combine Fig.12 and Fig.13 , Fig.12 is a schematic diagram of the arrangement structure of the first tank body provided in an embodiment of the present application; Fig.13 1 is a schematic diagram of the structure of the communication mode between the first groove body and the second groove body provided in the embodiment of the present application. Optionally, when the first groove 12 and the second groove 41 are strip grooves, they can be, for example Fig.11 As shown, the lengths of the first groove 12 and the second groove 41 both extend along the second direction Y. Alternatively, Fig.12 and Fig.13As shown, the lengths of the first groove 12 and the second groove 41 may extend along the second direction Y; or, one of the lengths of the first groove 12 and the second groove 41 may extend along the second direction Y, and the other may be arranged at staggered intervals along the second direction Y and have a length extending along the first direction X, that is, the length of the first groove 12 extends along the second direction Y, the second grooves 41 are arranged at staggered intervals along the second direction Y, and the length of the second groove 41 extends along the first direction X, or, the length of the second groove 41 extends along the second direction Y, the first grooves 12 are arranged at staggered intervals along the second direction Y, and the length of the first grooves 12 extends along the first direction X.

[0157] For example, Fig.12 and Fig.13 As shown, the length of the second groove 41 extends along the second direction Y, the first grooves 12 are arranged at staggered intervals along the second direction Y, and the length of the first groove 12 extends along the first direction X. In this way, the first rib position 122 and the second rib position 412 can be staggered, which is beneficial to reducing the stress concentration at the second groove body 411 and the first groove body 121, and further beneficial to avoiding the occurrence of fracture induction.

[0158] Optionally, as can be seen from the above, since the gas channel 6 is connected to the outside air, there may be a risk that external liquid and impurities enter the pole mounting hole 11 through the gas channel 6 and even contact the above-mentioned seal 3. It can be understood that the above-mentioned solution for reducing the entry of external liquid and impurities into the gas channel when both the first groove 12 and the second groove 41 can be one is also applicable to the case when both the first groove 12 and the second groove 41 are multiple. In addition, the present application further designs the solution for reducing the entry of external liquid and impurities into the gas channel when both the first groove 12 and the second groove 41 are multiple, as shown below:

[0159] Please combine Fig.14 , Fig.14 Schematic diagram of the structure of the opening of the gas channel connected to the outside provided in the embodiment of the present application. In some possible implementations, the opening design of the gas channel 6 connected to the outside can reduce the external liquid and impurities from entering the gas channel 6. For example, Fig.14As shown in (a), the projection of the second rib 412 on the first surface M separates the first groove body 121 into a first connecting portion 123 and a second connecting portion 124, and the first connecting portion 123 and the second connecting portion 124 are sequentially arranged along the first direction X. The projection of the first rib 122 on the abutting surface O separates the second groove body 411 into a third connecting portion 413 and a fourth connecting portion 414, and the third connecting portion 413 and the fourth connecting portion 414 are sequentially arranged along the first direction X. The first connecting portion 123 is connected to the fourth connecting portion 414, and the second connecting portion 124 is connected to the third connecting portion 413. Among the multiple first groove bodies 121, the first groove body closest to the edge of the abutting surface O is at least partially located outside the upper plastic. Along the first direction X, the width of the first connecting portion 123 is smaller than the width of the second connecting portion 124, and the width of the third connecting portion 413 is larger than the fourth connecting portion 414.

[0160] For example, Fig.14 As shown in (b), the projection of the second rib 412 on the first surface M separates the first groove body 121 into a first connecting portion 123 and a second connecting portion 124, and the first connecting portion 123 and the second connecting portion 124 are arranged in sequence along the first direction X. The projection of the first rib 122 on the abutting surface O separates the second groove body 411 into a third connecting portion 413 and a fourth connecting portion 414, and the third connecting portion 413 and the fourth connecting portion 414 are arranged in sequence along the first direction X. The first connecting portion 123 is connected to the fourth connecting portion 414, and the second connecting portion 124 is connected to the third connecting portion 413. Among the multiple second groove bodies 411, the second groove body 411 closest to the edge of the abutting surface O passes through the edge of the abutting surface O. Along the first direction X, the width of the first connecting portion 123 is greater than the width of the second connecting portion 124, and the width of the third connecting portion 413 is less than the fourth connecting portion 414.

[0161] In the above-mentioned embodiment, by setting the width of the first connecting portion 123 of the first groove body 121 connected to the outside to be smaller than the width of the second connecting portion 124, or the width of the third connecting portion 413 of the second groove body 411 connected to the outside to be smaller than the fourth connecting portion 414, the opening of the gas channel 6 in the first groove body 121 and the second groove body 411 connected to the outside is smaller, thereby preventing large-sized impurities from entering the inner side of the gas channel 6, which is beneficial to further avoid the occurrence of external impurities blocking the gas channel 6.

[0162] See also Fig.15 and Fig.16 , Fig.15 It is a schematic diagram of the length and width changes of the first trough body and the second trough body provided in an embodiment of the present application; Fig.16Schematic diagram of the depth variation of the first slot body and the second slot body provided in the embodiment of the present application. In some possible implementations, the depth and width of the plurality of first slot bodies 121 and the plurality of second slot bodies 411 can be designed to reduce the amount of external liquid and impurities entering the gas channel 6. For example, Fig.15 As shown in (a) in FIG. 1 , along the first direction X, the widths of the plurality of first slots 121 decrease sequentially.

[0163] Alternatively, if Fig.15 As shown in (a), along the second direction Y, the widths of the plurality of first slots 121 decrease in sequence along the first direction X, wherein the pole mounting hole 11 (see Fig.12 ) is a circular hole, the first direction X and the second direction Y are both radial directions of the pole mounting hole 11 on the first surface M, and the second direction Y is perpendicular to the first direction X. It can be understood that along the second direction Y, the widths of the plurality of first slots 121 decrease in sequence along the first direction X, except for Fig.15 In the manner shown in (a), that is, along the second direction Y, the width of a single first slot body 121 is consistent along the first direction X, and the widths of the plurality of first slot bodies 121 decrease successively along the first direction X. Alternatively, along the second direction Y, the width of a single first slot body 121 decreases successively along the first direction X, and the widths of the plurality of first slot bodies 121 decrease successively along the first direction X.

[0164] Alternatively, if Fig.15 As shown in (b) in FIG. 1 , along the first direction X, the widths of the plurality of second slots 411 decrease sequentially.

[0165] Alternatively, if Fig.15 As shown in (b), along the second direction Y, the widths of the plurality of second slots 411 decrease sequentially, wherein the pole mounting hole 11 (see Fig.12 ) is a circular hole, the first direction X and the second direction Y are both radial directions of the pole mounting hole 11 on the first surface M, and the second direction Y is perpendicular to the first direction X. It can be understood that along the second direction Y, the widths of the plurality of second slots 411 decrease in sequence along the first direction X, except for Fig.15 In the manner shown in (b), that is, along the second direction Y, the width of a single second slot body 411 is consistent along the first direction X, and the widths of the plurality of second slot bodies 411 decrease successively along the first direction X. Alternatively, along the second direction Y, the width of a single second slot body 411 decreases successively along the first direction X, and the widths of the plurality of second slot bodies 411 decrease successively along the first direction X.

[0166] Optionally, along the thickness direction Z of the end cover body 1, the depths of the plurality of first grooves 121 decrease sequentially. It is understandable that along the thickness direction Z of the end cover body 1, the depths of the plurality of first grooves 121 decrease sequentially along the first direction X, and there may be a variety of implementations. For example, Fig.16 As shown in (a) of FIG. 1 , along the thickness direction Z of the end cover body 1 , the depth of a single first groove body 121 is consistent along the first direction X, and the depths of the plurality of first groove bodies 121 decrease in sequence along the first direction X. For another example, Fig.16 As shown in (b) , along the thickness direction Z of the end cover body 1 , the depth of a single first groove body 121 decreases sequentially along the first direction X, and the depth of a plurality of first groove bodies 121 decreases sequentially along the first direction X.

[0167] Optionally, along the thickness direction Z of the end cap body 1, the depths of the plurality of second grooves 411 decrease sequentially. It is understandable that along the thickness direction Z of the end cap body 1, the depths of the plurality of second grooves 411 decrease sequentially along the first direction X, and there may be a variety of implementations. For example, Fig.16 As shown in (a) of FIG. 1 , along the thickness direction Z of the end cover body 1 , the depth of a single second groove body 411 is consistent along the first direction X, and the depths of the plurality of second groove bodies 411 decrease in sequence along the first direction X. For another example, Fig.16 As shown in (b) , along the thickness direction Z of the end cover body 1 , the depth of a single second groove body 411 decreases sequentially along the first direction X, and the depth of a plurality of second groove bodies 411 decreases sequentially along the first direction X.

[0168] In this way, by arranging a plurality of first groove bodies 121 and a plurality of second groove bodies 411, the dimensions of which in the first direction X, the second direction Y and the thickness direction Z of the end cover body 1 are gradually reduced along the direction in which the gas channel 6 is connected to the outside, so that the dimensions of the first groove body 121 and the second groove body 411 closest to the edge of the upper plastic 4 are the smallest, it is beneficial to further reduce the opening of the gas channel 6 connected to the outside air, and make the inner side of the gas channel 6 larger than the outer side, so as to further avoid the situation in which the gas channel 6 is blocked by external impurities.

[0169] Since the gas channel 6 needs to be connected to the pole mounting hole 11, there are many ways to connect. For example, the connection can be achieved by gap fitting between the end cover body 1 and the upper plastic 4 near the pole mounting hole 11; or, the connection can be achieved by respectively opening a first guide groove 112 and a second guide groove 422 at the end cover body 1 and the upper plastic 4 near the pole mounting hole 11, etc., which will be described in detail below.

[0170] See also Figures 17 to 20 , Fig.17 is a structural schematic diagram of a first sub-channel provided in an embodiment of the present application; Fig.18 is a cross-sectional schematic diagram of an end cap assembly provided in an embodiment of the present application; Fig.19 is another structural schematic diagram of the first sub-channel provided in an embodiment of the present application; Fig. 20 It is another structural schematic diagram of the first sub-channel provided in the embodiment of the present application. In some embodiments, the gas channel 6 includes a first sub-channel 62 and a second sub-channel 63 connected to the first sub-channel 62, the first sub-channel 62 is formed on the side of the upper plastic 4 adjacent to the pole mounting hole 11, and the first sub-channel 62 is connected to the pole mounting hole 11, and the connecting part of the first groove 12 and the second groove 41 forms a second sub-channel 63, and the second sub-channel 63 is configured to be connected to the outside air. The second sub-channel 63 formed by the pole mounting hole 11 and the first groove 12 and the second groove 41 are connected through the first sub-channel 62, thereby realizing the connection between the gas channel 6 and the pole mounting hole 11, so that in the helium detection, if the seal 3 fails, the helium can flow out through the pole mounting hole 11 through the gas channel 6 and be detected by the instrument, thereby avoiding the long-term use of batteries with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0171] In a possible implementation, the gas passage 6 can be connected to the pole mounting hole 11 by gap fitting between the end cover body 1 and the upper plastic 4 near the pole mounting hole 11. Fig.17 As shown, the end cover body 1 is provided with a first step surface D1 on one side close to the pole mounting hole 11, and the upper plastic 4 is provided with a second step surface D2 corresponding to the first step surface D1, and the first step surface D1 and the second step surface D2 are clearance-matched to form a first sub-channel 62. By setting the clearance-matching between the first step surface D1 and the second step surface D2 to form the first sub-channel 62, it is possible to avoid setting an additional structure to form the first sub-channel 62, which is conducive to reducing the impact on the structural strength of the end cover body 1 and the upper plastic 4; and, the structure of the end cover body 1 and the upper plastic 4 is made simpler, thereby facilitating the production and processing of the end cover body 1 and the upper plastic 4.

[0172] Alternatively, if Fig.17As shown, a recessed groove 13 is further provided on the first surface M, the recessed groove 13 is adjacent to the pole mounting hole 11 and communicated with the pole mounting hole 11, the inner wall surface 131 of the recessed groove, the bottom surface 132 of the recessed groove and the inner wall surface 111 of the pole mounting hole jointly form a first step surface D1, and a first convex portion 42 and a second convex portion 43 are provided on the abutting surface O, the first convex portion 42 and the second convex portion 43 are sequentially arranged along the center of the pole mounting hole 11 toward the edge of the abutting surface O, and the second convex portion 43 is connected to the first convex portion 42, the first convex portion 42 at least partially extends into the pole mounting hole 11, and the second convex portion 43 is connected to the recessed groove 13, and the side surface 421 of the first convex portion, the end surface 431 of the second convex portion and the side surface 432 of the second convex portion close to the second convex portion 43 are sequentially connected to jointly form a second step surface D2. Through the cooperation of the first step surface D1 formed by the sink groove 13 and the pole mounting hole 11 and the second step surface D2 formed by the first protrusion 42 and the second protrusion 43, on the one hand, the upper plastic 4 can be connected to the end cover body 1 in an aligned manner, avoiding the need to debug and calibrate the positions of the first groove 12 and the second groove 41 when assembling the end cover assembly 100, which is beneficial to improving the assembly efficiency of the end cover assembly 100; on the other hand, the structure of the end cover assembly 100 is made more compact. In addition, the first protrusion 42 can also achieve insulation between the pole 2 and the end cover body 1.

[0173] Alternatively, if Fig.17 and Fig.18 As shown, the end cap body 1 also has a second surface N opposite to the first surface M, the pole mounting hole 11 has a first opening 11a penetrating the first surface M, and a second opening 11b penetrating the second surface N, the seal 3 is sealed at the second opening 11b, and the first sub-channel 62 is connected to the first opening 11a. Since the seal 3 and the first sub-channel 62 are arranged at both ends of the pole mounting hole 11, the first sub-channel 62 will not pass through the position of the seal 3, and it is ensured that the first sub-channel 62 can be connected to the second sub-channel 63 from the seal 3, and then in the helium detection, if the seal 3 is not invalid, the helium will not flow out through the gas channel 6; if the seal 3 fails, the helium can flow out through the pole mounting hole 11 through the gas channel 6 and be detected by the instrument, thereby realizing the detection of whether the end cap assembly 100 is equipped with the seal 3 or whether there is a problem with the compression amount of the seal 3, which is conducive to preventing the long-term use of batteries with substandard sealing performance, and thus helping to reduce the risk of safety accidents.

[0174] In some possible implementations, the gas channel 6 can be connected to the pole mounting hole 11 by respectively providing a first guide groove 112 and a second guide groove 422 on the end cover body 1 and the upper plastic 4 near the pole mounting hole 11 .

[0175] In one example, Fig.19As shown in (a), a first guide groove 112 is provided on the inner wall surface 111 of the pole mounting hole. The first guide groove 112 extends along the thickness direction Z of the end cover body. The first guide groove 112 is connected to the second sub-channel 63, and the first guide groove 112 forms the first sub-channel 62.

[0176] In another example, Fig.19 As shown in (b), a first protrusion 42 is provided on the abutting surface O, and the first protrusion 42 at least partially extends into the pole mounting hole 11. The first protrusion 42 is configured to separate the end cover body 1 and the pole 2. A second guide groove 422 is provided on the side surface 421 of the first protrusion away from the pole. The second guide groove 422 extends along the thickness direction Z of the end cover body. The second guide groove 422 is connected to the second sub-channel 63, and the second guide groove 422 forms the first sub-channel 62.

[0177] In another example, Fig.19 As shown in (c), a first guide groove 112 is provided on the inner wall surface 111 of the pole mounting hole, and the first guide groove 112 extends along the thickness direction Z of the end cover body. A first convex portion 42 is provided on the abutting surface O, and the first convex portion 42 at least partially extends into the pole mounting hole 11. The first convex portion 42 is configured to separate the end cover body 1 and the pole 2. A second guide groove 422 is provided on the side surface 421 of the first convex portion away from the pole, and the second guide groove 422 extends along the thickness direction Z of the end cover body. The first guide groove 112 and the second guide groove 422 form a first sub-channel 62.

[0178] The method of forming the first sub-channel 62 by the first guide groove 112 and the second guide groove 422 can avoid the false sealing of the end cover assembly 100 caused by the lack of a fitting gap between the upper plastic 4 and the end cover body 1 or the blocking of the fitting gap, which is beneficial to improving the accuracy of false sealing detection and avoiding the influx of batteries with substandard sealing performance for a long time, thereby helping to reduce the risk of safety accidents.

[0179] It is understood that, in addition to the above, the first sub-channel 62 may also be formed in, for example, Fig. 20As shown, by respectively opening the first groove 12 and the second groove 41 on the first step surface D1 and the second step surface D2, the first groove portion is connected with the second groove to form the first sub-channel 62. Similarly, the first sub-channel 62 can also be formed by opening the first guide groove 112 on the first step surface D1, and the first guide groove 112 forms the first sub-channel 62, or opening the second guide groove 422 on the second step surface D2, and the second guide groove 422 forms the first sub-channel 62, or opening the first guide groove 112 and the second guide groove 422 on the first step surface D1 and the second step surface D2, and the first guide groove 112 and the second guide groove 422 form the first sub-channel 62.

[0180] Optionally, the end cover body 1 also has a second surface N opposite to the first surface M, the pole mounting hole 11 has a first opening 11a passing through the first surface M, and a second opening 11b passing through the second surface N, the seal 3 is sealed in the second opening 11b, and when the first guide groove 112 forms the first sub-channel 62, the first guide groove 112 is connected to the first opening 11a.

[0181] Optionally, the end cover body 1 also has a second surface N opposite to the first surface M, the pole mounting hole 11 has a first opening 11a passing through the first surface M, and a second opening 11b passing through the second surface N, the seal 3 is sealed in the second opening 11b, and when the second guide groove 422 forms the first sub-channel 62, the second guide groove 422 is connected to the first opening 11a.

[0182] Optionally, as mentioned above, the end cover body 1 also has a second surface N opposite to the first surface M, the pole mounting hole 11 has a first opening 11a passing through the first surface M, and a second opening 11b passing through the second surface N, the seal 3 is sealed in the second opening 11b, and when the first guide groove 112 and the second guide groove 422 form the first sub-channel 62, the first guide groove 112 and the second guide groove 422 are connected to the first opening 11a.

[0183] Since the first guide groove 112 and the second guide groove 422 are spaced apart from the seal 3 at the two ends of the pole mounting hole 11, it is possible to avoid the first sub-channel 62 passing through the position of the seal 3, and ensure that the first sub-channel 62 can be connected to the second sub-channel 63 from the seal 3, thereby ensuring that during helium detection, if the seal 3 has not failed, the helium will not flow out through the gas channel 6; if the seal 3 fails, the helium can flow out through the pole mounting hole 11 through the gas channel 6 and be detected by the instrument, thereby realizing the detection of whether the end cover assembly 100 is equipped with the seal 3 or whether there is a problem with the compression amount of the seal 3, which is beneficial to avoid the influx of batteries with substandard sealing performance for a long time, and thus helps to reduce the risk of safety accidents.

[0184] See also Fig.21 and Fig. 22 , Fig.21 It is a schematic structural diagram of an end cover body of multiple gas channels provided in an embodiment of the present application; Fig. 22 It is a schematic diagram of the structure of the upper plastic of multiple gas channels provided in an embodiment of the present application. In some embodiments, a plurality of first grooves 12 are provided, and the plurality of first grooves 12 are arranged at intervals around the center of the pole mounting hole 11, and a plurality of second grooves 41 are provided corresponding to the plurality of first grooves 12, and each second groove 41 is respectively connected with the corresponding first groove 12 to form a plurality of gas channels 6. The plurality of gas channels 6 are provided on the end cap assembly 100, which can avoid the situation where a single gas channel 6 is blocked and causes a false seal of the end cap assembly 100, thereby facilitating the improvement of the accuracy of false seal detection, and facilitating the prevention of the influx of batteries with substandard sealing performance for a long time, thereby facilitating the reduction of the risk of safety accidents.

[0185] See also Fig.23 , Fig.23 2 is a schematic diagram of the structure of the battery provided in the embodiment of the present application. In the second aspect, the embodiment of the present application further provides a battery 200, the battery 200 comprising a shell 201 and an end cap assembly 100 as described in the first aspect above, the shell 201 having an opening 202, and the end cap assembly 100 being configured to close the opening 202. The battery 200 with the end cap assembly 100 can also detect the failure of the seal 3 through the detection equipment, thereby avoiding the long-term use of batteries 200 with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0186] See also Fig.24 , is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application. In the third aspect, the embodiment of the present application also provides a battery pack 300, which includes the battery 200 as described in the second aspect above. The battery pack 300 having the battery 200 also has the end cover assembly 100 of the first aspect above, which can also detect the failure of the seal 3 through the detection equipment, thereby avoiding the long-term use of the battery pack 300 with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0187] See also Fig.25 , Fig.25 : is a schematic diagram of the structure of the electric device provided in the embodiment of the present application. In the fourth aspect, the embodiment of the present application further provides an electric device 400, which includes the battery 200 as described in the second aspect above, or the battery pack 300 as described in the third aspect above. Specifically, the electric device 400 may include but is not limited to vehicles, energy storage systems, electronic products (such as mobile phones, laptops, tablet computers, etc.).

[0188] The following description is made by taking the electrical equipment 400 as a household energy storage system as an example. Fig. 9 As shown, the household energy storage system may include an electric energy conversion device 401, a user load 402, and a battery 200 or a battery pack 300 as described above, wherein the battery 200 or the battery pack 300 stores the electric energy of the electric energy conversion device 401 and transmits the electric energy to the user load 402. Exemplarily, the electric energy conversion device 401 may be a photovoltaic panel, and the user load 402 may include street lamps and household appliances (not shown). The battery 200 or the battery pack 300 may be used as a small energy storage box, which may be mounted on an outdoor wall by wall hanging. The photovoltaic panel may convert solar energy into electric energy during the period of low electricity prices. The battery 200 or the battery pack 300 is used to store the electric energy and supply it to street lamps and household appliances for use during the peak electricity prices, or to supply power when the power grid is out of power / power outage.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An end cap assembly, characterized in that: include: An end cover body, the end cover body having a first surface along the thickness direction, a pole mounting hole and a first groove are provided on the first surface, the pole mounting hole penetrates the end cover body along the thickness direction of the end cover body, and the first groove is located at the periphery of the pole mounting hole; A pole, the pole being inserted into the pole mounting hole; a sealing member, the sealing member being sealingly connected between the pole and the pole mounting hole; and An upper plastic, wherein the upper plastic sleeve is arranged on the outer periphery of the pole, and the upper plastic abuts against the first surface of the end cover body, and the side of the upper plastic abutting against the end cover body is an abutting surface, and a second groove is provided on the abutting surface, along the thickness direction of the end cover body, the openings of the first groove and the second groove face each other, and the second groove portion is connected with the first groove to form a gas channel, and the gas channel is connected with the pole mounting hole, and the gas channel is configured to connect to the outside air.

2. The end cap assembly according to claim 1, characterized in that: The first groove is at least partially located outside the upper plastic so that the gas channel is connected to the outside air; or, The second groove passes through the outer peripheral surface of the upper plastic so that the gas channel is connected to the outside air.

3. The end cap assembly according to claim 2, characterized in that: When the first groove is at least partially located outside the upper plastic, along the thickness direction of the end cover body, the depth of the first groove is less than the depth of the second groove; or, When the second groove passes through the outer peripheral surface of the upper plastic, along the thickness direction of the end cover body, the depth of the first groove is greater than the depth of the second groove.

4. The end cap assembly according to claim 2, characterized in that: When the first groove is at least partially located outside the upper plastic, a blocking portion is provided on one side edge of the first groove communicating with the outside air, and the blocking portion is configured to block at least a portion of an opening of the first groove on the first surface; or, When the second groove passes through the outer peripheral surface of the upper plastic, a blocking portion is provided at the edge of the second groove located at the abutting surface, and the blocking portion is configured to block at least part of the opening of the second groove on the side wall surface of the upper plastic.

5. The end cap assembly according to claim 1, characterized in that: The first groove extends along a first direction, and the second groove is located at the edge of the abutting surface and passes through the outer peripheral surface of the upper plastic; or, The second groove extends along a first direction, the first groove is arranged at an edge of the upper plastic, and at least a portion of the first groove is located outside the edge of the upper plastic; Wherein, the first direction is the direction in which the pole mounting hole points to the edge of the end cover body.

6. The end cap assembly according to claim 1, characterized in that: The first groove includes a plurality of first groove bodies, and the plurality of first groove bodies are sequentially spaced along a first direction; The second groove includes a plurality of second groove bodies, which are sequentially arranged at intervals along the first direction, and portions of each second groove body are staggered with the corresponding first groove body along the first direction, and portions of each second groove body connected with the corresponding first groove body together form the gas channel; Wherein, the first direction is the direction in which the pole mounting hole points to the edge of the end cover body.

7. The end cap assembly according to claim 6, characterized in that: A first rib is formed between two adjacent first grooves, and a projection of the first rib on the abutting surface is located in the second groove; and A second rib is formed between two adjacent second slots, and a projection of the second rib on the first surface is located in the first slot.

8. The end cap assembly according to claim 7, characterized in that: Along the first direction, the ratio of the width of the first rib to the width of the first groove is 0.3-0.5; and / or, The ratio of the width of the second rib to the width of the second slot is 0.3-0.

5.

9. The end cap assembly according to claim 7, characterized in that: The projection of the second rib on the first surface divides the first groove into a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are sequentially arranged along the first direction, the projection of the first rib on the abutting surface divides the second groove into a third connecting portion and a fourth connecting portion, the third connecting portion and the fourth connecting portion are sequentially arranged along the first direction, the first connecting portion is connected to the fourth connecting portion, and the second connecting portion is connected to the third connecting portion; Among the plurality of first grooves, the first groove closest to the outer peripheral side of the upper plastic is at least partially located outside the upper plastic, and along the first direction, the width of the first connecting portion is smaller than the width of the second connecting portion, and the width of the third connecting portion is larger than the fourth connecting portion; or, Among the plurality of second grooves, the second groove closest to the outer peripheral side of the upper plastic penetrates the edge of the abutting surface. Along the first direction, the width of the first connecting portion is greater than the width of the second connecting portion, and the width of the third connecting portion is less than the fourth connecting portion.

10. The end cap assembly according to any one of claims 6 to 9, characterized in that: Along the first direction, the widths of the plurality of first slots decrease sequentially; and / or, Along the first direction, the widths of the plurality of second slots decrease sequentially; and / or, Along the thickness direction of the end cover body, the depths of the plurality of first grooves decrease sequentially; and / or, Along the thickness direction of the end cover body, the depths of the plurality of second grooves decrease sequentially; and / or, Along the second direction, the widths of the plurality of first slots decrease in sequence; and / or, Along the second direction, the widths of the plurality of second slots decrease sequentially; Wherein, the pole mounting hole is a circular hole, the first direction and the second direction are both radial directions of the pole mounting hole on the first surface, and the second direction is perpendicular to the first direction.

11. The end cap assembly according to any one of claims 6 to 9, characterized in that: Along the first direction, the width ratio of the second slot body to the first slot body is 1.2-1.5; and / or, The first slot body and the second slot body are strip-shaped slots, the lengths of the first slot body and the second slot body extend along a second direction, and along the second direction, the length ratio of the second slot body to the first slot body is 1.2-1.5; Wherein, the pole mounting hole is a circular hole, the first direction and the second direction are both radial directions of the pole mounting hole on the first surface, and the second direction is perpendicular to the first direction.

12. The end cap assembly according to any one of claims 1 to 9, characterized in that: The gas channel includes a first sub-channel and a second sub-channel connected to the first sub-channel, the first sub-channel is formed on a side of the upper plastic adjacent to the pole mounting hole, and the first sub-channel is connected to the pole mounting hole, the connecting part of the first groove and the second groove forms the second sub-channel, and the second sub-channel is configured to be connected to the outside air.

13. The end cap assembly according to claim 12, characterized in that: A first step surface is provided on one side of the end cover body close to the pole mounting hole, and a second step surface is provided on the upper plastic corresponding to the first step surface. The first step surface and the second step surface are clearance-matched to form the first sub-channel.

14. The end cap assembly according to claim 13, characterized in that: A recessed groove is further provided on the first surface, the recessed groove is adjacent to the pole mounting hole and communicated with the pole mounting hole, and the inner wall surface of the recessed groove, the bottom surface of the recessed groove and the inner wall surface of the pole mounting hole jointly form the first step surface; A first convex portion and a second convex portion are provided on the abutting surface, and the first convex portion and the second convex portion are sequentially arranged in a direction from the center of the pole mounting hole to the edge of the abutting surface, the first convex portion at least partially extends into the pole mounting hole, the second convex portion is connected to the sink groove, and the side surface of the first convex portion, the end surface of the second convex portion and the side surface of the second convex portion are sequentially connected to jointly form the second step surface.

15. The end cap assembly according to claim 13, wherein: The end cover body also has a second surface opposite to the first surface, the pole mounting hole has a first opening penetrating the first surface, and a second opening penetrating the second surface, the seal is sealed at the second opening, and the first sub-channel is connected to the first opening.

16. The end cap assembly according to claim 12, wherein: A first guide groove is provided on the inner wall surface of the pole mounting hole, the first guide groove extends along the thickness direction of the end cover body, and the first guide groove is connected to the second sub-channel; and / or, A first convex portion is provided on the abutting surface, the first convex portion at least partially extends into the pole mounting hole, the first convex portion is configured to separate the end cover body and the pole, a second guide groove is provided on the side surface of the first convex portion, the second guide groove extends along the thickness direction of the end cover body, and the second guide groove is connected to the second sub-channel; Wherein, the first guide groove and / or the second guide groove form the first sub-channel.

17. The end cap assembly according to claim 16, characterized in that The end cover body also has a second surface opposite to the first surface, the pole mounting hole has a first opening penetrating the first surface, and a second opening penetrating the second surface, and the sealing member is sealed at the second opening; When the first guide groove forms the first sub-channel, the first guide groove is connected to the first opening; and / or, When the second guide groove forms the first sub-channel, the second guide groove is connected to the first opening.

18. The end cap assembly according to any one of claims 1 to 9, characterized in that: There are multiple first grooves, which are arranged at intervals around the center of the pole mounting hole. There are multiple second grooves corresponding to the multiple first grooves, and each second groove is respectively connected to the corresponding first groove part to form a plurality of gas channels.

19. A battery, characterized in that: The invention comprises a shell and an end cap assembly according to any one of claims 1 to 18, wherein the shell has an opening, and the end cap assembly is configured to close the opening.

20. A battery pack, characterized in that: Comprising the battery of claim 19.

21. An electrical equipment, characterized in that: Comprising the battery as claimed in claim 19 or the battery pack as claimed in claim 20.

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