End cover assembly, battery, energy storage device and electric equipment

Abstract

The invention discloses an end cover assembly, a battery, an energy storage device and electric equipment.The end cover assembly comprises a cover plate body, a pole, a sealing piece, upper plastic and a pressing block, the cover plate body is provided with a penetrating pole mounting hole, the pole penetrates through the pole mounting hole, the sealing piece is connected between the pole and the pole mounting hole in a sealed mode, and the upper plastic is arranged on the sealing piece; the upper plastic sleeves the periphery of the pole and abuts against the cover plate body, a first groove is formed in the side, away from the cover plate body, of the upper plastic, the pressing block sleeves the periphery of the pole and abuts against the upper plastic, a second groove is formed in the side, close to the upper plastic, of the pressing block, and the second groove and the first groove are partially communicated 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 provided by the embodiment of the invention, the problem of neglected loading or sealing failure of the sealing element can be detected through the detection equipment, so that a battery of which the long-term sealing performance does not reach the standard 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, an energy storage device, 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, which may cause the battery to short circuit, catch fire, or 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, sealing rings are usually used to seal the mounting holes in the related technology, and the sealing performance of the sealing rings is detected by instruments. 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 sealing ring is forgotten to be assembled or there is a problem with the compression of the sealing ring, 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. Summary of the invention

[0004] The embodiments of the present application disclose an end cover assembly, a battery, an energy storage device, and an electrical device, which can prevent the formation of a false seal between the pressing block, the upper plastic, and the cover body, and can detect the problem of seal failure through a detection device, which is beneficial to avoid the influx of batteries with substandard sealing performance into use for a long time, and is beneficial to 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 cover assembly, comprising:

[0006] A cover plate body, wherein the cover plate body is provided with a pole mounting hole penetrating along a thickness direction of the cover plate body;

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

[0008] A sealing member, wherein the sealing member is sealingly connected between the pole and the pole mounting hole;

[0009] An upper plastic, wherein the upper plastic is sleeved on the outer periphery of the pole and abuts against the cover body, and a first groove is provided on a side of the upper plastic away from the cover body; and

[0010] A pressing block, the pressing block is sleeved on the outer periphery of the pole and abuts against the upper plastic, and a second groove is provided on a side of the pressing block close to the upper plastic;

[0011] The opening of the second groove faces the opening of the first groove, and the second groove is partially staggered with the first groove, so that the part of the second groove communicating with the first groove together forms a gas channel, the gas channel is connected to the pole mounting hole, and the gas channel is configured to communicate with the outside air.

[0012] The end cap assembly provided in the embodiment of the present application is staggered by the first groove on the upper plastic and the second groove on the pressing block, so that the connected part forms a gas channel, and the gas channel is connected to the pole mounting hole, so that the end cap assembly will not form a false seal due to the tight fit between the cover body, the upper plastic and the pressing block. Therefore, during the production process, if the end cap assembly is not assembled or there is a problem with the compression amount of the assembled seal, due to the existence of the gas channel, the seal is missing or failed. The problem can be detected by the detection equipment, thereby avoiding the long-term use of batteries with substandard sealing performance, which is beneficial to reduce the risk of safety accidents. In addition, since the gas channel is formed by connecting the first groove and the second groove by staggering the part, the groove structure inside the gas channel allows the gas channel to have a longer gas path, thereby reducing the probability of external impurities and liquids entering, which is beneficial to avoid the erosion of the seal.

[0013] As an optional embodiment, the first groove is configured to communicate with the outside air, or the second groove is configured to communicate with the outside air. In this way, compared with the method in which both the first groove and the second groove are communicated with the outside air, the gas passage is communicated with the outside air by the method in which the first groove or the second groove is each communicated with the outside air, which can reduce the opening of the gas passage communicating with the outside air, thereby facilitating the prevention of large particles of external impurities from entering the gas passage, and avoiding the occurrence of large particles of impurities blocking the gas passage.

[0014] As an optional implementation manner, when the first groove is configured to communicate with the outside air, the depth of the first groove along the thickness direction of the cover body is less than the depth of the second groove; or,

[0015] When the second groove is configured to communicate with the outside air, along the thickness direction of the cover plate 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 configured to communicate with the outside air, a blocking portion is provided at the edge of the first groove located at the upper plastic, and the blocking portion is configured to block at least part of the opening of the first groove communicating with the outside air; or,

[0018] When the second groove is configured to communicate with the outside air, a blocking portion is provided at the edge of the second groove located at the pressing block, and the blocking portion is configured to block at least a portion of the opening of the second groove communicating with the outside air.

[0019] By providing a blocking portion at the outermost edge of the 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 reducing the probability of external impurities and liquids entering and corroding the seal; and is beneficial to avoiding the occurrence of external impurities blocking the gas channel.

[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 pressing block and passes through the edge of the pressing block; or,

[0022] The second groove extends along a first direction, and the first groove is located at an edge of the upper plastic and passes through 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, the single long strip groove can reduce the impact on the structural strength of the upper plastic or the pressing block, avoid the setting of the gas channel causing the structural strength of the upper plastic or the pressing block to be significantly reduced, thereby avoiding the weakening of the structural strength of the end cover assembly at the gas channel, and thus avoiding the occurrence of deformation or fracture failure of the end cover assembly due to the large force transmitted by the pole during assembly or welding.

[0024] As an optional embodiment, a mounting groove is provided on a side of the upper plastic away from the cover body, the pressing block is arranged in the mounting groove, and the bottom surface of the pressing block abuts against the bottom surface of the mounting groove, and the side surface of the pressing block abuts against the inner wall surface of the mounting groove;

[0025] The first groove is provided on the bottom surface of the installation groove and / or the inner wall surface of the installation groove, and the second groove is provided on the bottom surface of the pressing block and / or the side surface of the pressing block.

[0026] Through this embodiment, on the one hand, by setting the pressing block in the installation groove on the upper plastic, the upper plastic can better separate the pressing block from the cover body, so that the insulation between the pressing block and the cover body is more reliable. On the other hand, by also opening the first groove on the inner wall surface of the installation groove and the second groove on the side surface of the pressing block, the gas channel has a longer gas path, thereby reducing the probability of external impurities and liquids entering, which is conducive to preventing the seal from being corroded.

[0027] As an optional embodiment, when the first groove is provided on the bottom surface of the mounting groove and the inner wall surface of the mounting groove, the second groove is located at the edge of the side surface of the pressing block away from the cover plate body and passes through the edge of the side surface of the pressing block; or,

[0028] When the second groove is provided on the bottom surface and the side surface of the pressing block, the first groove is located at the edge of the inner wall of the installation groove away from the cover body and passes through the edge of the inner wall of the installation groove.

[0029] By adopting this embodiment, the first groove or the second groove is partially extended along the first direction and partially extended along the thickness direction of the cover body, that is, the first groove or the second groove is set as an L-shaped groove. Compared with the method of setting the first groove and the second groove as an L-shaped groove at the same time, the single L-shaped groove can reduce the impact on the structural strength of the upper plastic or the pressing block, avoid the setting of the gas channel causing the structural strength of the upper plastic or the pressing block to be significantly reduced, thereby avoiding the weakening of the structural strength of the end cover assembly at the gas channel, thereby avoiding the occurrence of deformation or fracture failure of the end cover assembly due to the large force transmitted by the pole during assembly or welding.

[0030] 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;

[0031] The second groove includes a plurality of second groove bodies, which are arranged in sequence at intervals along the first direction, and along the first direction, each of the second groove bodies is staggered with the corresponding first groove body part, and the parts of each of the second groove bodies connected with the corresponding first groove bodies together form the gas channel.

[0032] The gas passage is formed by staggering a plurality of first grooves and a plurality of second grooves. The gas passage can be made longer by the cooperation between the plurality of first grooves and the plurality of second grooves, thereby reducing the probability of foreign impurities and liquids entering, thereby helping to avoid the erosion of the seal and further helping to avoid the blocking of the gas passage by foreign impurities. In addition, since pressure needs to be applied to the upper plastic and the pressing block when assembling the upper plastic and the pressing block, the upper plastic is easily deformed, or, when the end cover assembly is baked, the upper plastic is easily expanded by heat, thereby causing the upper plastic to re-cover the gas passage, thereby causing the gas passage to be sealed and ineffective. The gas passage is formed by staggering a plurality of first grooves and a plurality of second grooves. Due to the cooperation between the plurality of first grooves and the plurality of second grooves, the deformation or expansion of the upper plastic can be reduced, thereby avoiding the blocking and failure of the gas passage.

[0033] As an optional embodiment, a mounting groove is provided on a side of the upper plastic away from the cover body, the pressing block is arranged in the mounting groove, and the bottom surface of the pressing block abuts against the bottom surface of the mounting groove, and the side surface of the pressing block abuts against the inner wall surface of the mounting groove;

[0034] A plurality of the first groove bodies are arranged along the bottom surface of the installation groove toward the inner wall surface of the installation groove, and a plurality of the second groove bodies are arranged along the bottom surface of the pressing block toward the side surface of the pressing block.

[0035] The first groove body and the second groove body are also alternately arranged on the inner wall surface of the installation groove and the side surface of the pressure block, which can further make the gas path of the gas channel longer, thereby further reducing the probability of external impurities and liquid entering, which is beneficial to further avoid erosion of the seal and further avoid the occurrence of external impurities blocking the gas channel.

[0036] As an optional implementation, a first rib is formed between two adjacent first grooves, and a projection of the first rib on the surface of the pressing block is located in the second groove; and

[0037] A second rib is formed between two adjacent second grooves, and a projection of the second rib on the surface of the upper plastic is located in the first groove.

[0038] By adopting this embodiment, on the one hand, the first rib and the second rib formed can avoid the stress concentration phenomenon of the pressing block 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 situation that the entire end cover assembly is subjected to the large force transmitted by the pole, causing the pressing block or the upper plastic to deform or break and fail during assembly or welding. On the other hand, during the use of the battery, the internal pressure of the shell will increase or decrease, causing the end cover assembly to bulge, dent, and other breathing-like deformations, so that the pressing block and the upper plastic are 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 cover body and the upper plastic, which is conducive to avoiding the situation where the first slot body and the second slot body form a fracture induction effect.

[0039] As an optional implementation, along the extension direction of the gas channel, the ratio of the width of the first rib to the width of the first groove body is 0.3-0.5; and / or,

[0040] The ratio of the width of the second rib to the width of the second groove body is 0.3-0.5.

[0041] 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 to 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 upper plastic and the pressing block can be reduced, avoiding the situation where the upper plastic and the pressing block are easily induced to fracture due to the opening of the first groove body and the second groove body.

[0042] As an optional embodiment, the projection of the second rib on the outer surface of the upper plastic separates 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 extension direction of the gas channel, the projection of the first rib on the outer surface of the pressing block separates 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 extension direction of the gas channel, the first connecting portion is connected to the fourth connecting portion, and the second connecting portion is connected to the third connecting portion;

[0043] When the first slot body closest to the edge of the gas channel among the plurality of first slot bodies is configured to communicate with the outside air, along the extension direction of the gas channel, 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 width of the fourth connecting portion; or,

[0044] Among the multiple second groove bodies, when the second groove body closest to the edge of the gas channel is configured to connect to the outside air, along the extension direction of the gas channel, the width of the first connecting part is greater than the width of the second connecting part, and the width of the third connecting part is smaller than the fourth connecting part.

[0045] 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.

[0046] 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 upper surface of the cover body, and the second direction is perpendicular to the first direction.

[0047] As an optional implementation, along the extension direction of the gas channel, the widths of the plurality of first slots decrease in sequence; and / or,

[0048] Along the extension direction of the gas channel, the widths of the plurality of second slots decrease in sequence; and / or,

[0049] Along the extension direction of the gas channel, the depths of the plurality of first grooves decrease in sequence; and / or,

[0050] Along the extension direction of the gas channel, the depths of the plurality of second grooves decrease in sequence; and / or,

[0051] Along the extension direction of the gas channel, the widths of the plurality of first slots extending along the second direction decrease in sequence; and / or,

[0052] Along the extension direction of the gas channel, the widths of the plurality of second slots extending along the second direction decrease sequentially.

[0053] Since the depths of the multiple first slots and the multiple second slots and the dimensions in the extension direction of the gas channel and the thickness direction of the cover plate body respectively decrease gradually along the direction of the gas channel communicating with the outside, the first slot closest to the edge of the upper plastic and the second slot closest to the edge of the pressing block have the smallest dimensions, which is conducive to further reducing the opening of the gas channel communicating with the outside air, and making the inside of the gas channel larger than the outside, which is conducive to further avoiding the situation where the gas channel is blocked by external impurities.

[0054] As an optional implementation, along the extension direction of the gas channel, the width ratio of the first slot body to the second slot body is 1.2-1.5; and / or,

[0055] 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 first slot body to the second slot body is 1.2-1.5.

[0056] 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 pressing block, 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 pressing block is subjected to greater force, the second slot body is set smaller than the first slot body, so that the width of the second rib position is greater than the first rib position, further avoiding the occurrence of fracture induction in the pressing block.

[0057] 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.

[0058] As an optional embodiment, the upper plastic and the pole are gap-matched to form the first sub-channel. By setting the gap between the upper plastic and the pole to form the first sub-channel, it is possible to avoid setting an additional structure to form the first sub-channel, which is beneficial to reducing the impact on the structural strength of the upper plastic and the pole; and the structure of the upper plastic and the pole is more concise, thereby facilitating the production and processing of the upper plastic and the pole.

[0059] 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, 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.

[0060] 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 missing seals or 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.

[0061] In a third aspect, the embodiment of the present application further discloses an energy storage device, including the battery as described in the second aspect above. The energy storage device having the battery of the second aspect above also has the end cap assembly of the first aspect above, which can also detect the problem of missing seals or seal failure through the detection equipment, thereby avoiding the long-term use of energy storage devices with substandard sealing performance, which is conducive to reducing the risk of safety accidents.

[0062] 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 an energy storage device as described in the third aspect above.

[0063] Compared with the prior art, the beneficial effects of this application are:

[0064] The end cap assembly, battery, energy storage device and electrical equipment provided by the embodiments of the present application are characterized in that the end cap assembly is provided with a first groove on the upper plastic and a second groove on the pressing block, and the first groove and the second groove are staggered to form a gas channel, so that the gas channel can be constructed to connect the two sides of the cover body 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 cover body are tightly fitted, a false seal will not be formed, so that the failure of the seal or the problem of missing installation 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.

[0065] 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

[0066] 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.

[0067] Figure 1 is a schematic structural diagram of an end cap assembly provided in an embodiment of the present application;

[0068] 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;

[0069] 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;

[0070] Figure 4 yes Figure 1 Schematic diagram of the cross section at AA in the middle;

[0071] Figure 5 yes Figure 4 A schematic diagram of the structure in which the gas channel at A in the middle is connected to the outside air;

[0072] 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;

[0073] Figure 7 This is a schematic diagram of the first structure of the gas channel provided in the embodiment of the present application;

[0074] Figure 8 is a second structural schematic diagram of a gas channel provided in an embodiment of the present application;

[0075] Fig. 9 This is a third structural schematic diagram of the gas channel provided in the embodiment of the present application;

[0076] Fig.10 This is a schematic diagram of the first structure of the plastic upper provided in the embodiment of the present application;

[0077] Fig.11 This is a schematic diagram of the first structure of the pressing block provided in the embodiment of the present application;

[0078] Fig.12This is a schematic diagram of a first structure in which there are multiple first grooves and multiple second grooves provided in an embodiment of the present application;

[0079] Fig.13 This is a schematic diagram of the second structure of the plastic provided in the embodiment of the present application;

[0080] Fig.14 This is a schematic diagram of the second structure of the pressing block provided in the embodiment of the present application;

[0081] Fig.15 This is a schematic diagram of a second structure in which there are multiple first grooves and multiple second grooves provided in an embodiment of the present application;

[0082] Fig.16 is a schematic diagram of the structure of the first rib position and the second rib position provided in an embodiment of the present application;

[0083] Fig.17 It is a schematic diagram of the structure of the first rib position and the second rib position (when the upper plastic is provided with a mounting groove) provided in an embodiment of the present application;

[0084] Fig.18 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;

[0085] Fig.19 is a schematic diagram of the arrangement structure of the second tank body provided in an embodiment of the present application;

[0086] Fig. 20 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;

[0087] Fig.21 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;

[0088] Fig. 22 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;

[0089] Fig.23 is a schematic diagram of depth variation of the first trough body and the second trough body provided in an embodiment of the present application;

[0090] Fig.24 is a structural schematic diagram of a first sub-channel provided in an embodiment of the present application;

[0091] Fig.25 is another structural schematic diagram of the first sub-channel provided in an embodiment of the present application;

[0092] Fig.26 It is a schematic diagram of the structure of the upper plastic of multiple gas channels provided in an embodiment of the present application;

[0093] Fig. 27 It is a schematic diagram of the structure of a compression block of multiple gas channels provided in an embodiment of the present application;

[0094] Fig.28 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0095] Fig.29 is a schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0096] Fig.30 It is a schematic diagram of the structure of the electrical equipment provided in the embodiment of the present application.

[0097] Description of reference numerals:

[0098] 100-end cover assembly; 1-cover body; 11-pole mounting hole; 11a-first opening; 11b-second opening; M-first surface; N-second surface; 12-auxiliary cover; 121-through hole; 122-explosion-proof valve fence; 13-explosion-proof hole; 131-explosion-proof valve protection sheet; 132-explosion-proof valve; 2-pole; 21-second guide groove; 3-seal; 4-upper plastic; 41-mounting groove; 411-bottom surface of mounting groove; 412-inner wall surface of mounting groove; 42-first groove; 421-first groove body; 422-first rib position; 423-first connecting part; 424- The second connecting part; 43-air hole; 44-first guide groove; 5-pressing block; 51-second groove; 511-second groove body; 512-second rib position; 513-third connecting part; 514-fourth connecting part; 52-bottom surface of the pressing block; 53-side surface of the pressing block; K1-blocking part; K-gas channel; K2-first sub-channel; K3-second sub-channel; X-first direction; Y-second direction; Z-thickness direction; 200-battery; 201-shell; 202-opening; 300-energy storage device; 400-electrical equipment; 401-electric energy conversion device; 402-user load. DETAILED DESCRIPTION

[0099] 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.

[0100] In this application, the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] Before explaining the technical solution of the present application, the inventive concept of the present application is first explained.

[0105] 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 the battery, 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 are tightly fitted, and the upper plastic is made of plastic and other materials, it has a certain elasticity, which makes it 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 the compression amount of the seal is problematic, it is difficult to detect it through the detection equipment, which will lead to the long-term use of batteries with substandard sealing performance, and there is a risk of safety accidents caused by sealing failure during use.

[0106] 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, by opening a guide groove on the upper plastic or on the pressure block, 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.

[0107] However, the inventors have discovered through research that when the guide groove is opened in a straight line or an arc shape, external impurities and liquids can easily enter the seal directly through the guide groove during use, 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 a safety accident.

[0108] In view of this point, the embodiment of the present application provides an end cap assembly, because the upper plastic is provided with a first groove, the pressure block 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 deflection channel, which is conducive to avoiding the erosion of the seal. .

[0109] Specifically, the present application discloses an end cap assembly, a battery, an energy storage device 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 cover plate 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 cover plate 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 make specific limitations on this.

[0110] 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.

[0111] 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 1 A 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 a cover body 1, a pole 2, a seal 3, an upper plastic 4 and a pressing block 5, the cover body 1 is provided with a pole mounting hole 11 that passes through along the thickness direction Z of the cover body 1, the pole 2 is inserted into the pole mounting hole 11, the seal 3 is sealed and connected between the pole 2 and the pole mounting hole 11, the upper plastic 4 is sleeved on the outer periphery of the pole 2, and the upper plastic 4 is in contact with the cover body 1, and the upper plastic 4 is away from the cover body 1. A first groove 42 is provided on one side, the pressing block 5 is sleeved on the outer periphery of the pole 2 and abuts against the upper plastic 4, and a second groove 51 is provided on the side of the pressing block 5 close to the upper plastic 4, the opening of the second groove 51 faces the opening of the first groove 42, and the second groove 51 and the first groove 42 are partially staggered, so that the part where the second groove 51 communicates with the first groove 42 together forms a gas channel K, the gas channel K is communicated with the pole mounting hole 11, and the gas channel K is configured to communicate with the outside air.

[0112] The end cap assembly 100 provided in the embodiment of the present application is partially staggered by the first groove 42 on the upper plastic 4 and the second groove 51 on the pressing block 5, so that the connected part forms a gas channel K, and the gas channel K is connected to the pole mounting hole 11, so that the end cap assembly 100 will not form a false seal because the cover body 1, the upper plastic 4 and the pressing block 5 are very tightly fitted. Therefore, during the production process, if the end cap assembly 100 is not assembled or the assembled seal 3 has a problem with the compression amount, due to the existence of the gas channel K, the seal 3 can be detected by the detection equipment. The problem of missing or failure of the seal 3 can be avoided, thereby preventing the long-term sealing performance of the battery from being used, which is conducive to reducing the risk of safety accidents. In addition, since the gas channel K is formed by the first groove 42 and the second groove 51 being partially staggered and connected, the groove structure inside the gas channel K makes the gas channel K have a longer gas path, thereby reducing the probability of external impurities and liquids entering, which is conducive to preventing the seal 3 from being eroded.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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 cover body 1 with the shell so that the cover body 1 forms a positive output, and the pole 2 is a negative output. Therefore, it is necessary to insulate the pole 2 penetrating the cover body 1 from the cover body 1 through the negative upper plastic.

[0117] 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 cover 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 cover body 1 from the cover body 1 through the negative pole upper plastic. Since both the cover 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.

[0118] It can be understood that the cover body 1 has a first surface M along the thickness direction Z and a second surface (not shown) away from the first surface M, the upper plastic 4 abuts against the first surface M, the pole mounting hole 11 has a first opening 11a passing through the first surface M, and a second opening (not shown) passing through the second surface (not shown), and the seal 3 seals the second opening. When the 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 N and the second opening face the inside of the battery.

[0119] As an optional implementation, Figure 2 and Figure 3 As shown, the end cap assembly 100 further includes an auxiliary cover body 12, the auxiliary cover body 12 abuts against the surface of the cover body 1 on the side away from the first surface M along the thickness direction Z of the cover body 1, the second surface N is the surface of the auxiliary cover body 12 on the side away from the cover body 1, the auxiliary cover body 12 is provided with a through hole 121 penetrating the auxiliary cover body 12 along the thickness direction Z of the cover body 1 corresponding to the pole mounting hole 11, and an explosion-proof valve fence 122 located on the side of the through hole 121, the through hole 121 is connected to the pole mounting hole 11, the second opening 11b is the opening on the side of the through hole 121 away from the cover body 1, the seal 3 is sealed at the second opening 11b, and the explosion-proof valve fence 122 is configured to reduce the pressure in the battery when the pressure in the battery reaches the bursting pressure. . The cover body 1 is provided with an explosion-proof hole 13 on the peripheral side of the pole mounting hole 11 corresponding to the explosion-proof valve fence 122, and the explosion-proof hole 13 penetrates the cover body 1 along the thickness direction Z of the cover body 1. The explosion-proof hole 13 is covered with an explosion-proof valve protection sheet 131 and an explosion-proof valve 132, the explosion-proof valve protection sheet 131 is located on the first surface M, and the explosion-proof valve 132 is arranged between the cover body 1 and the auxiliary cover body 12.

[0120] In this way, the auxiliary cover body 12 can provide a certain support force to the cover body 1, so as to avoid deformation and fatigue of the 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 breakage or serious deformation of the cover body 1 and failure. In addition, the auxiliary cover body 12 can provide a setting position for the explosion-proof valve fence 122; the explosion-proof valve protection sheet 131 and the explosion-proof valve 132 can ensure the sealing of the end cover assembly 100 on the one hand; on the other hand, the explosion-proof valve fence 122 and the explosion-proof valve 132 are protected to prevent the explosion-proof valve fence 122 and the explosion-proof valve 132 from being corroded. In addition, the explosion-proof valve fence 122 can further provide protection for the explosion-proof valve 132.

[0121] Optionally, the explosion-proof valve protection sheet 131 includes a plastic sheet, a rubber sheet, a silicone sheet, etc., which is not limited in this embodiment. By setting the explosion-proof valve protection sheet 131 to be a plastic sheet, a rubber sheet or a silicone sheet, the explosion-proof valve fence 122 and the explosion-proof valve 132 can be protected to prevent external impurities and liquids from corroding the explosion-proof valve fence 122 and the explosion-proof valve 132, causing the explosion-proof valve fence 122 and the explosion-proof valve 132 to fail.

[0122] Optionally, the explosion-proof valve 132 includes a metal plate, an aluminum-plastic plate, etc., which is not limited in this embodiment. .

[0123] The structure of the gas channel of the present application will be described in detail below with reference to the accompanying drawings.

[0124] In one example, both the first groove 42 and the second groove 51 can be a single groove.

[0125] In another example, both the first groove 42 and the second groove 51 can be a plurality of grooves (this part will be described in detail later).

[0126] When there is only one first groove 42 and second groove 51, the first groove 42 may be a strip groove, and extends from the center of the pole mounting hole 11 to the edge of the upper plastic 4 (i.e., the first direction). Alternatively, the second groove 51 may be a strip groove, and extends from the center of the pole mounting hole 11 to the edge of the pressing block 5. When the first groove 42 is a strip groove, the second groove 51 only needs to be partially connected to the first groove 42, and the second groove 51 may be a circular groove or a strip groove. Conversely, if the second groove 51 is a strip groove, the first groove 42 only needs to be partially connected to the second groove 51, and in this case, the first groove 42 may be a circular groove or a strip groove.

[0127] See also Figure 5 , Figure 5 yes Figure 4Schematic diagram of the structure in which the gas channel at A is connected to the outside air. Optionally, the connection between the gas channel K and the outside air can be implemented in a variety of ways, for example, the connection to the outside air is achieved through the first groove 42, or the connection to the outside air is achieved through the second groove 51, or the connection to the outside air is achieved through both the first groove 42 and the second groove 51. They will be introduced below.

[0128] In one example, Figure 5 As shown in (a) of FIG. 1 , the first groove 42 is configured to communicate with the outside air, and the first groove 42 may pass through the edge of the upper plastic 4 so that the gas channel K communicates with the outside air.

[0129] In another example, Figure 5 As shown in (b) of FIG. 5 , the second groove 51 is configured to communicate with the outside air. The second groove 51 can pass through the edge of the pressing block 5 so that the gas channel K is connected to the outside air.

[0130] In another example, Figure 5 As shown in (c), the first groove 42 and the second groove 51 are configured to communicate with the outside air. The first groove 42 can pass through the edge of the upper plastic 4, and the second groove 51 can pass through the edge of the pressing block 5, so that the gas channel K is connected to the outside air.

[0131] In the above-mentioned various examples, the gas channel K is connected to the outside air by the first groove 42 or the second groove 51 being connected to the outside air, so that it is possible to avoid the need to set up an additional air guide channel to connect the gas channel K to the outside air, which is beneficial to reducing the manufacturing process of the end cap assembly 100. Moreover, compared with the method in which both the first groove 42 and the second groove 51 are connected to the outside air, the gas channel is connected to the outside air by the first groove or the second groove being connected to the outside air, which can also reduce the opening of the gas channel K connected to the outside air, thereby facilitating the blocking of large particles of foreign impurities from entering the gas channel, and avoiding the occurrence of large particles of impurities blocking the gas passage.

[0132] Considering that the gas channel K needs to be connected to the outside air, there may be a risk that external liquid and impurities enter the gas channel K, and then enter the pole mounting hole 11 through the gas channel K 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:

[0133] In some possible implementations, the depth relationship between the first groove 42 and the second groove 51 can be designed to reduce the inlet of the gas channel K, thereby reducing the external liquid and impurities from entering the gas channel K. For example, Figure 5As shown in (a) of FIG. 1 , if the first groove 42 is configured to communicate with the outside air, the depth of the first groove 42 can be made smaller than the depth of the second groove 51, that is, along the thickness direction Z of the cover body 1, the depth of the first groove 42 is smaller than the depth of the second groove 51. For another example, Figure 5 As shown in (b), if the second groove 51 is configured to communicate with the outside air, the depth of the second groove 51 can be made smaller than the depth of the first groove 42. That is, along the thickness direction Z of the cover body 1, the depth of the first groove 42 is greater than the depth of the second groove 51.

[0134] In this way, by setting the depth relationship between the first groove and the second groove, the opening of the gas channel K connecting to the outside air can be further reduced, which is beneficial to further block large particles of impurities; and the impurities entering the gas channel K are made smaller in size than the depth of the first groove 42 and the second groove 51, thereby further avoiding the occurrence of external impurities blocking the gas channel K.

[0135] See also Figure 6 , Figure 6 is a schematic diagram of a structure in which a blocking portion is provided at the opening of a gas channel provided in an embodiment of the present application. In some possible implementations, a blocking portion K1 may be added to prevent external impurities from entering the gas channel K. For example, Figure 6 As shown in (a) of FIG. 1 , if the first groove 42 is configured to communicate with the outside air, a blocking portion K1 may be provided at the edge of the first groove 42 located at the upper plastic 4, and the blocking portion K1 is configured to block at least part of the opening of the first groove 42 communicating with the outside air. Figure 6 As shown in (b), if the second groove 51 is configured to communicate with the outside air, a blocking portion K1 is provided at the edge of the second groove 51 located at the pressing block 5, and the blocking portion K1 is configured to block at least part of the opening of the second groove 51 communicating with the outside air.

[0136] By providing a blocking portion K1 at the outermost edge of the first groove 42 or the second groove 51 connected to the outside air, the size of impurities entering the gas channel K can be further limited, which is beneficial to reducing the probability of external impurities and liquids entering and corroding the seal 3; and is beneficial to avoiding the occurrence of external impurities blocking the gas channel K.

[0137] Optionally, as can be seen from the foregoing, the first groove 42 and the second groove 51 can be one or more. When the first groove 42 and the second groove 51 are one or more, the way in which they communicate with the outside air can also be considered.

[0138] Please combine Figure 7 , Figure 7 This is a schematic diagram of the first structure of the gas channel provided in the embodiment of the present application.

[0139] For example, Figure 7 As shown in (a) of FIG. 1 , the first groove 42 and the second groove 51 are both one, the first groove 42 is a long strip groove, and the first groove 42 extends along the first direction X, while the second groove 51 is located at the edge of the pressing block 5 and passes through the edge of the pressing block 5, wherein the first direction X is the direction in which the pole mounting hole 11 points to the edge of the cover body 1. That is, the extension length of the first groove 42 is greater than the extension length of the second groove 51.

[0140] For example, Figure 7 As shown in (b), the first groove 42 and the second groove 51 are both one, and the second groove 51 is a long strip groove, so the second groove 51 extends along the first direction X, and the first groove 42 is located at the edge of the upper plastic 4 and passes through the edge of the upper plastic 4, wherein the first direction X is the direction from the pole mounting hole 11 to the edge of the cover body 1. That is, the extension length of the second groove 51 is greater than the extension length of the first groove 42.

[0141] The first groove 42 or the second groove 51 is extended along the first direction X, that is, the first groove 42 or the second groove 51 is set as a long strip groove. Compared with the method of setting the first groove 42 and the second groove 51 as long strip grooves at the same time, the single long strip groove can reduce the influence on the structural strength of the upper plastic 4 or the pressing block 5, avoid the setting of the gas channel K causing the structural strength of the upper plastic 4 or the pressing block 5 to be significantly reduced, thereby avoiding the structural strength of the end cover assembly 100 at the gas channel K to be 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, resulting in deformation or fracture failure of the end cover assembly 100.

[0142] In order to achieve a better insulation effect between the pressing block 5 and the cover body 1, a mounting groove 41 can be provided on the side of the upper plastic 4 away from the cover body 1, and the pressing block 5 can be arranged in the mounting groove 41, so that the upper plastic can better separate the pressing block 5 from the cover body 1, thereby making the insulation between the pressing block 5 and the cover body 1 more reliable. When the pressing block 5 is arranged in the mounting groove 41, the way in which the first groove 42 and the second groove 51 are connected to the outside air can also be considered.

[0143] Please combine Figure 8 , Figure 8This is a second structural schematic diagram of the gas channel provided in the embodiment of the present application. In some optional embodiments, the upper plastic 4 is provided with a mounting groove 41 on the side facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the bottom surface 411 of the mounting groove is provided with a first groove 42, and the bottom surface 52 of the pressing block is provided with a second groove 51, and the opening of the first groove 42 faces the opening of the second groove 51.

[0144] Optionally, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the bottom surface 411 of the mounting groove and the inner wall surface 412 of the mounting groove are provided with a first groove 42, and the bottom surface 52 of the pressing block is provided with a second groove 51, and the opening of the first groove 42 on the bottom surface 411 of the mounting groove faces the opening of the second groove 51.

[0145] Optionally, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the bottom surface 411 of the mounting groove and the inner wall surface 412 of the mounting groove are provided with a first groove 42, and the side surface 53 of the pressing block is provided with a second groove 51, and the opening of the first groove 42 on the inner wall surface 412 of the mounting groove faces the opening of the second groove 51.

[0146] Optionally, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the bottom surface 411 of the mounting groove is provided with a first groove 42, and the bottom surface 52 of the pressing block and the side surface 53 of the pressing block are provided with a second groove 51, and the opening of the first groove 42 faces the opening of the second groove 51 on the bottom surface 52 of the pressing block.

[0147] Optionally, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the inner wall surface 412 of the mounting groove is provided with a first groove 42, and the bottom surface 52 of the pressing block and the side surface 53 of the pressing block are provided with a second groove 511, and the opening of the first groove 42 faces the opening of the second groove 51 on the side surface 53 of the pressing block.

[0148] Optionally, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove, the bottom surface 411 of the mounting groove and the inner wall surface 412 of the mounting groove are provided with a first groove 42, and the bottom surface 52 of the pressing block and the side surface 53 of the pressing block are provided with a second groove 51, the opening of the first groove 42 on the bottom surface 411 of the mounting groove faces the opening of the second groove 51 on the bottom surface 52 of the pressing block, and the opening of the first groove 42 on the inner wall surface 412 of the mounting groove faces the opening of the second groove 51 on the side surface 53 of the pressing block.

[0149] Through this embodiment, on the one hand, by setting the pressing block 5 in the installation groove 41 on the upper plastic 4, the upper plastic 4 can better separate the pressing block 5 from the cover body 1, so that the insulation between the pressing block 5 and the cover body 1 is more reliable. On the other hand, by also providing the first groove 42 on the inner wall surface 412 of the installation groove and the second groove 51 on the side surface 53 of the pressing block, the gas channel K has a longer gas path, thereby reducing the probability of external impurities and liquids entering, which is conducive to preventing the seal 3 from being corroded.

[0150] When the pressing block 5 is disposed in the mounting groove 41 and there is only one first groove 42 and one second groove 51 , the manner in which the first groove 42 and the second groove 51 are connected to the external air can also be considered.

[0151] For example, Figure 8 As shown in (a), the first groove 42 and the second groove 51 are both one, and the first groove 42 is an L-shaped groove. When the first groove 42 is provided on the bottom surface 411 of the mounting groove and the inner wall surface 412 of the mounting groove, the second groove 51 is located at the edge of the side surface 53 of the pressing block away from the cover body 1 and passes through the edge of the side surface 53 of the pressing block, and the opening of the second groove 51 faces the opening of the first groove 42 on the inner wall surface 412 of the mounting groove.

[0152] For example, Figure 8 As shown in (b), the first groove 42 and the second groove 51 are both one, and the second groove 51 is an L-shaped groove. When the second groove 51 is provided on the bottom surface 52 of the pressing block and the side surface 53 of the pressing block, the first groove 42 is located at the edge of the inner wall surface 412 of the mounting groove away from the cover body 1 and passes through the edge of the inner wall surface 412 of the mounting groove, and the opening of the first groove 42 faces the opening of the second groove 51 on the side surface 53 of the pressing block.

[0153] In this embodiment, the first groove 42 or the second groove 51 is partially extended along the first direction X and partially extended along the thickness direction Z of the cover plate body 1, that is, the first groove 42 or the second groove 51 is set as an L-shaped groove. Compared with the method of setting the first groove 42 and the second groove 51 as an L-shaped groove at the same time, the single L-shaped groove can reduce the impact on the structural strength of the upper plastic 4 or the pressing block 5, avoid the setting of the gas channel K causing the structural strength of the upper plastic 4 or the pressing block 5 to be significantly reduced, thereby avoiding the structural strength of the end cover assembly 100 at the gas channel K 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, resulting in deformation or fracture failure of the end cover assembly 100.

[0154] Please combine Fig. 9 , Fig. 9 4 is a third structural diagram of the gas channel provided in the embodiment of the present application. When the pressure block 5 is set in the installation groove 41, and the first groove 42 and the second groove 51 are both one, in addition to the above-mentioned method of connecting with the outside air through the first groove 42 and the second groove 51, it can also be that the inner wall surface 412 of the installation groove is provided with an air hole 43, and the first groove 42 and the second groove 51 are connected with the outside air through the air hole 43. For example, Fig. 9 As shown in (a), the first groove 42 and the second groove 51 are both one, and the upper plastic 4 is provided with a mounting groove 41 on the side away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove; the first groove 42 is a long strip groove, and the first groove 42 is extended along the first direction X and arranged on the bottom surface 411 of the mounting groove, the second groove 51 is located at the edge of the bottom surface 52 of the pressing block and penetrates the edge of the bottom surface 52 of the pressing block, and the inner wall surface 412 of the mounting groove is provided with an air hole 43, the air hole 43 penetrates to the side wall surface of the upper plastic 4 along the first direction X, and the air hole 43 is connected with the second groove 51, wherein the first direction X is the direction in which the pole mounting hole 11 points to the edge of the cover body 1.

[0155] For example, Fig. 9As shown in (b), the first groove 42 and the second groove 51 are both one, the upper plastic 4 is provided with a mounting groove 41 on the side away from the cover body 1, the pressing block 5 is arranged in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove; the second groove 51 is a long strip groove, then the second groove 51 is extended along the first direction X and arranged on the bottom surface 52 of the pressing block, the first groove 42 is located at the edge of the bottom surface 411 of the mounting groove and passes through the edge of the bottom surface 411 of the mounting groove, and the inner wall surface 412 of the mounting groove is provided with an air hole 43, the air hole 43 passes through the side wall surface of the upper plastic 4 along the first direction X, and the air hole 43 is connected with the first groove 42, wherein the first direction X is the direction in which the pole mounting hole 11 points to the edge of the cover body 1.

[0156] The manner in which there are multiple first grooves 42 and multiple second grooves 51 will be described in detail below.

[0157] See also Figures 10 to 12 , Fig.10 This is a schematic diagram of the first structure of the plastic upper provided in the embodiment of the present application; Fig.11 This is a schematic diagram of the first structure of the pressing block provided in the embodiment of the present application; Fig.12 When the first groove 42 includes a plurality of first groove bodies 421 and the second groove 51 includes a plurality of second groove bodies 5111, the plurality of first groove bodies 421 and the plurality of second groove bodies 5111 can be sequentially arranged in intervals along the first direction X.

[0158] Specifically, Figures 10 to 12As shown, the first groove 42 includes a plurality of first groove bodies 421, which are arranged in sequence along the first direction X, and the second groove 51 includes a plurality of second groove bodies 511, which are arranged in sequence along the first direction X, and along the first direction X, each second groove body 511 is staggered with the corresponding first groove body 421 part, and the part of each second groove body 511 connected with the corresponding first groove body 421 together forms a gas channel K; wherein the first direction X is the direction in which the pole mounting hole 11 points to the edge of the cover body 1. The plurality of first groove bodies 421 and the plurality of second groove bodies 511 are staggered to form the gas channel K. Through the mutual cooperation between the plurality of first groove bodies 421 and the plurality of second groove bodies 511, the gas path of the gas channel K can be made longer and more complex, thereby reducing the probability of external impurities and liquids entering, thereby facilitating the sealing member 3 from being corroded, and further facilitating the occurrence of the situation where the gas channel K is blocked by external impurities. In addition, since pressure needs to be applied to the upper plastic 4 and the pressing block 5 when assembling the upper plastic 4 and the pressing block 5, the upper plastic 4 is easily deformed, or, when the end cover assembly 100 is baked, the upper plastic 4 is easily expanded by heat, which causes the upper plastic 4 to re-cover the gas channel K, thereby causing the gas channel K to be sealed and fail. The gas channel K is formed by staggering multiple first grooves 421 and multiple second grooves 511. Due to the mutual cooperation between the multiple first grooves 421 and the multiple second grooves 511, the deformation or expansion degree of the upper plastic 4 can be reduced, thereby avoiding the occurrence of gas channel K being blocked and failing.

[0159] See also Figures 13 to 15 , Fig.13 This is a schematic diagram of the second structure of the plastic provided in the embodiment of the present application; Fig.14 This is a schematic diagram of the second structure of the pressing block provided in the embodiment of the present application; Fig.15 It is a schematic diagram of a second structure in which the first groove and the second groove are multiple provided in the embodiment of the present application. It can be understood that when the pressing block 5 is arranged in the installation groove 41, and the first groove 42 and the second groove 51 are multiple, the multiple first grooves 42 and the multiple second grooves 51 can be partially arranged in sequence along the first direction X, and the other part can be arranged in sequence along the thickness direction Z of the cover body 1.

[0160] Specifically, Figures 13 to 15As shown, a mounting groove 41 is provided on the side of the upper plastic 4 facing away from the cover body 1, and the pressing block 5 is provided in the mounting groove 41, and the bottom surface 52 of the pressing block abuts against the bottom surface 411 of the mounting groove, and the side surface 53 of the pressing block abuts against the inner wall surface 412 of the mounting groove. A plurality of first grooves 421 are arranged along the bottom surface 411 of the mounting groove and upward toward the inner wall surface 412 of the mounting groove. A plurality of second grooves 511 are arranged along the bottom surface 52 of the pressing block toward the side surface 53 of the pressing block. The openings of the first groove bodies 421 on the bottom surface 411 of the mounting groove face the openings of the corresponding second groove bodies 511 on the bottom surface 52 of the pressing block, the openings of the first groove bodies 421 on the inner wall surface 412 of the mounting groove face the openings of the corresponding second groove bodies 511 on the side surface 53 of the pressing block, and the second groove bodies 511 are staggered with the corresponding parts of the first groove bodies 421, and the parts of the second groove bodies 511 connected to the corresponding first groove bodies 421 together form the gas channel K.

[0161] The first groove body 421 and the second groove body 511 are also alternately arranged on the inner wall surface 412 of the installation groove and the side surface 53 of the pressure block, which can further make the gas path of the gas channel K longer and more complex, thereby further reducing the probability of external impurities and liquids entering, which is beneficial to further avoid erosion of the seal 3 and further avoid the occurrence of external impurities blocking the gas channel K.

[0162] Since multiple first grooves 421 and multiple second grooves 511 are respectively provided on the upper plastic 4 and the pressing block 5, the multiple first grooves 421 and multiple second grooves 511 may affect the structural strength of the upper plastic 4 and the pressing block 5, and thus the upper plastic 4 and the pressing block 5 may be at risk of breaking at the multiple first grooves 421 and multiple second grooves 511. Based on this, the present application also designs a solution to avoid the multiple first grooves 421 and multiple second grooves 511 from having a significant impact on the structural strength of the upper plastic 4 and the pressing block 5, as shown below:

[0163] See also Fig.16 , Fig.16: is a schematic diagram of the structure of the first rib and the second rib provided in the embodiment of the present application. As an optional embodiment, a first rib 422 is formed between two adjacent first slots 421, and the projection of the first rib 422 on the surface of the pressing block 5 is located in the second slot 511, and a second rib 512 is formed between two adjacent second slots 511, and the projection of the second rib 512 on the surface of the upper plastic 4 is located in the first slot 421. With this embodiment, on the one hand, the first rib 422 and the second rib 512 formed can avoid the stress concentration phenomenon formed on the upper plastic 4 and the pressing block 5 at the first slot 421 and the second slot 511, and the first rib 422 and the second rib 512 can support and cooperate at the first slot 421 and the second slot 511, so as to avoid the deformation or fracture failure of the pressing block 5 or the upper plastic 4 caused by the large force transmitted by the pole 2 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 cover assembly 100 to bulge, dent, or other breathing-like deformations, which will induce fractures in the areas where the pressure block 5 and the upper plastic 4 are thinned or where the structural strength is fragile, resulting in more obvious creep fatigue. The arrangement of the first rib 422 and the second rib 512 can avoid the first groove body 421 and the second groove body 511 being too large, thereby reducing the influence of the first groove body 421 and the second groove body 511 on the structural strength of the cover plate body 1 and the upper plastic 4, which is beneficial to avoid the formation of fracture induction effects in the first groove body 421 and the second groove body 511.

[0164] See also Fig.16 , Fig.17 It is a schematic diagram of the structure of the first rib position and the second rib position (when the upper plastic is provided with a mounting groove) provided in an embodiment of the present application. It can be understood that when the pressing block 5 is provided in the mounting groove 41, and there are multiple first grooves 42 and multiple second grooves 51, two adjacent first grooves 42 and two adjacent second grooves 51 can also form the first rib position 422 and the second rib position 512 respectively.

[0165] Specifically, Fig.17 As shown, a first rib position 422 is formed between two adjacent first groove bodies 421, a projection of the first rib position 422 on the bottom surface 411 of the mounting groove on the bottom surface 52 of the pressing block, and a projection of the first rib position 422 on the inner wall surface 412 of the mounting groove on the side surface 53 of the pressing block are both located in the second groove body 511, a second rib position 512 is formed between two adjacent second groove bodies 511, a projection of the second rib position 512 on the bottom surface 52 of the pressing block on the bottom surface 411 of the mounting groove, and a projection of the second rib position 512 on the side surface 53 of the pressing block on the inner wall surface 412 of the mounting groove are both located in the first groove body 421.

[0166] By forming the first rib 422 and the second rib 512, it is possible to avoid stress concentration between the pressing block 5 and the upper plastic 4 at the first groove 421 and the second groove 511. The first rib 422 and the second rib 512 can support and cooperate at the first groove 421 and the second groove 511, thereby avoiding deformation or fracture failure of the pressing block 5 or the upper plastic 4 when the end cover assembly 100 is subjected to a large force as a whole. In addition, by setting the first rib 422 and the second rib 512, it is possible to avoid the first groove 421 and the second groove 511 being too large, thereby reducing the influence of the first groove 421 and the second groove 511 on the structural strength of the upper plastic 4 and the pressing block 5, thereby facilitating the avoidance of fracture induction at the first groove and the second groove.

[0167] In some possible implementations, the width ratio of the first rib 422 to the first groove 421 and the width ratio of the second rib 512 to the second groove 511 can be set to avoid the plurality of first grooves 421 and the plurality of second grooves 511 from having a significant impact on the structural strength of the upper plastic 4 and the pressing block 5.

[0168] In one example, along the extension direction of the gas channel K, the ratio of the width of the first rib 422 to the width of the first groove body 421 is 0.3-0.5, for example, may be 0.3, 0.4, 0.5, etc.

[0169] In another example, along the extension direction of the gas channel K, the ratio of the width of the second rib 512 to the width of the second groove body 511 is 0.3-0.5, for example, it can be 0.3, 0.4, 0.5, etc.

[0170] In another example, along the extension direction of the gas channel K, the ratio of the width of the first rib position 422 to the width of the first groove body 421 is 0.3 to 0.5, and the ratio of the width of the second rib position 512 to the width of the second groove body 511 is 0.3 to 0.5, that is, the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0..3, 0.4, 0.5, etc., and the ratio of the width of the second rib position 512 to the width of the second groove body 511 can also be 0.3, 0.4, 0.5, etc. For example, the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.3, and the ratio of the width of the second rib position 512 to the width of the second groove body 511 can also be 0.3, 0.4, 0.5, etc.; or, the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.4, and the ratio of the width of the second rib position 512 to the width of the second groove body 511 can also be 0.3, 0.4, 0.5, etc.; or, the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.5, and the ratio of the width of the second rib position 512 to the width of the second groove body 511 can also be 0.3, 0.4, 0.5, etc., which is not limited to this in this embodiment.

[0171] Optionally, along the extension direction of the gas channel K, the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.3-0.5, or the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.4-0.5, or the ratio of the width of the first rib position 422 to the width of the first groove body 421 can be 0.45-0.5, and so on, which is not limited to this in the present embodiment.

[0172] Optionally, along the extension direction of the gas channel K, the ratio of the width of the second rib 512 to the width of the second groove body 511 can be 0.3-0.5, or the ratio of the width of the second rib 512 to the width of the second groove body 511 can be 0.4-0.5, or the ratio of the width of the second rib 512 to the width of the second groove body 511 can be 0.45-0.5, and so on, which is not limited to this in the present embodiment.

[0173] By setting the width ratio of the first rib 422 to the first groove 421 and the width ratio of the second rib 512 to the second groove 511 to 0.3-0.5, the first rib 422 and the second rib 512 can have better supporting strength at the first groove 421 and the second groove 511, so that the influence of the first groove 421 and the second groove 511 on the structural strength of the upper plastic 4 and the pressing block 5 can be reduced, and the situation that the upper plastic 4 and the pressing block 5 are easily induced to fracture due to the opening of the first groove 421 and the second groove 511 can be avoided.

[0174] See also Fig.18 , Fig.18 4 is a schematic diagram of the width and length ratio of the second slot body to the first slot body provided in the embodiment of the present application. In some possible implementations, the influence of the plurality of first slot bodies 421 and the plurality of second slot bodies 511 on the structural strength of the upper plastic 4 and the pressing block 5 can also be reduced by designing the width of the second slot body 511 and the first slot body 421.

[0175] Optionally, the pole mounting hole 11 (see Figure 3 ) 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 upper surface (ie, the first surface M) of the cover body 1, and the second direction Y is perpendicular to the first direction X.

[0176] In one example, Fig.18 As shown in (a), along the direction in which the gas channel K communicates with the outside air, the width ratio of the first groove body 421 to the second groove body 511 is 1.2-1.5.

[0177] In another example, Fig.18 As shown in (b), the first slot body 421 and the second slot body 511 are strip-shaped slots, and the lengths of the first slot body 421 and the second slot body 511 extend along the second direction Y. Along the second direction Y, the length ratio of the first slot body 421 to the second slot body 511 is 1.2 to 1.5, wherein the pole mounting hole 11 (see Figure 3 ) 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 upper surface (ie, the first surface M) of the cover body 1, and the second direction Y is perpendicular to the first direction X.

[0178] In another example, Fig.18 As shown in (c), the first slot body 421 and the second slot body 511 are strip-shaped slots, and the lengths of the first slot body 421 and the second slot body 511 extend along the second direction Y. Along the second direction Y, the length ratio of the first slot body 421 to the second slot body 511 is 1.2 to 1.5, and along the extension direction of the gas channel K, the width ratio of the first slot body 421 to the second slot body 511 is 1.2 to 1.5, wherein the pole mounting hole 11 (see Figure 3 ) 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 upper surface (ie, the first surface M) of the cover body 1, and the second direction Y is perpendicular to the first direction X.

[0179] By setting the width ratio and length ratio of the second groove body 511 and the first groove body 421, on the one hand, the second groove body 511 and the first groove body 421 can have more interlaced space, so that the gas channel K has sufficient circulation space, which is conducive to ensuring that helium can circulate if the seal 3 fails during helium inspection; on the other hand, by setting the ratio, the area of ​​the second groove body 511 and the first groove body 421 is prevented from being misaligned, thereby reducing the suspended area of ​​the contact surface between the upper plastic 4 and the pressing block 5, which is conducive to reducing the occurrence of fracture induction caused by stress concentration at the second groove body 511 and the first groove body 421. In addition, since the pressing block 5 is subjected to greater force, the second groove body 511 is set smaller than the first groove body 421, so that the width of the second rib position 512 is greater than the first rib position 422, further avoiding the occurrence of fracture induction of the pressing block 5.

[0180] It can be understood that when the first slot body 421 and the second slot body 511 are configured as strip-shaped slots, the second direction Y is the length direction of the first slot body 421 and the second slot body 511 .

[0181] It is understandable that the first slot body 421 and the second slot body 511 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 421 and the second slot body 511 may be circular slots, square slots, etc. in addition to being strip slots, and this embodiment does not limit this.

[0182] Please combine Fig.19 and Fig. 20 , Fig.19 is a schematic diagram of the arrangement structure of the second tank body provided in an embodiment of the present application; Fig. 20 is a schematic diagram of the structure of the connection mode between the first slot body and the second slot body provided in the embodiment of the present application. Optionally, when the first slot body 421 and the second slot body 511 are strip-shaped slots, the lengths of the first slot body 421 and the second slot body 511 may both extend along the second direction Y. Alternatively, Fig.19 and Fig. 20 As shown, the length of one of the first slot body 421 and the second slot body 511 extends along the second direction Y, and the other is staggered and spaced along the second direction Y and the length extends along the first direction X, that is, the length of the first slot body 421 extends along the second direction Y, and the second slot body 511 is staggered and spaced along the second direction Y, and the length of the second slot body 511 extends along the first direction X, or the length of the second slot body 511 extends along the second direction Y, and the first slot body 421 is staggered and spaced along the second direction Y, and the length of the first slot body 421 extends along the first direction X.

[0183] For example, Fig.19 and Fig. 20As shown, the length of the first slot body 421 extends along the second direction Y, and the second slot body 511 is arranged at staggered intervals along the second direction Y, and the length of the second slot body 511 extends along the first direction X. In this way, the first rib position 422 and the second rib position 512 can be staggered, which is beneficial to reducing the stress concentration at the second slot body 511 and the first slot body 421, and further beneficial to avoiding the occurrence of fracture induction.

[0184] Optionally, as can be seen from the above, since the gas channel K 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 K 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 42 and the second groove 51 can be one is also applicable to the case when both the first groove 42 and the second groove 51 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 42 and the second groove 51 are multiple, as shown below:

[0185] Please combine Fig.21 , Fig.21 is a 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 K connected to the outside can reduce the external liquid and impurities from entering the gas channel K. For example, Fig.21 As shown in (a), the projection of the second rib 512 on the outer surface of the upper plastic 4 divides the first groove body 421 into a first connecting portion 423 and a second connecting portion 424, and the first connecting portion 423 and the second connecting portion 424 are sequentially arranged along the extension direction of the gas channel K. The projection of the first rib 422 on the outer surface of the pressing block 5 divides the second groove body 511 into a third connecting portion 513 and a fourth connecting portion 514, and the third connecting portion 513 and the fourth connecting portion 514 are sequentially arranged along the extension direction of the gas channel K. The first connecting portion 423 is connected to the fourth connecting portion 514, and the second connecting portion 424 is connected to the third connecting portion 513. Among the multiple first groove bodies 421, the first groove body 421 closest to the edge of the gas channel K is configured to connect to the outside air. Along the extension direction of the gas channel K, the width of the first connecting portion 513 is smaller than the width of the second connecting portion 514, and the width of the third connecting portion 513 is larger than the fourth connecting portion 514.

[0186] For example, Fig.21As shown in (b), the projection of the second rib 512 on the outer surface of the upper plastic 4 divides the first groove body 421 into a first connecting portion 423 and a second connecting portion 424, and the first connecting portion 423 and the second connecting portion 424 are sequentially arranged along the extension direction of the gas channel K. The projection of the first rib 422 on the outer surface of the pressing block 5 divides the second groove body 511 into a third connecting portion 513 and a fourth connecting portion 514, and the third connecting portion 513 and the fourth connecting portion 514 are sequentially arranged along the extension direction of the gas channel K. The first connecting portion 423 is connected to the fourth connecting portion 514, and the second connecting portion 424 is connected to the third connecting portion 513. Among the plurality of second groove bodies 511, the second groove body 511 closest to the edge of the gas channel K is configured to connect to the outside air. Along the extension direction of the gas channel K, the width of the first connecting portion 423 is greater than the width of the second connecting portion 424, and the width of the third connecting portion 513 is smaller than the fourth connecting portion 514.

[0187] In the above-mentioned embodiment, by setting the width of the first connecting portion 423 of the first groove body 421 connected to the outside to be smaller than the width of the second connecting portion 424, or the width of the third connecting portion 513 of the second groove body 511 connected to the outside to be smaller than the fourth connecting portion 514, the opening of the gas channel K in the first groove body 421 and the second groove body 511 connected to the outside is smaller, which can further limit the size of impurities entering the inside of the gas channel K, which is beneficial to further avoid the occurrence of external impurities blocking the gas channel K.

[0188] See also Fig. 22 and Fig.23 , Fig. 22 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.23 Schematic 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 421 and the plurality of second slot bodies 511 can be designed to reduce the amount of external liquid and impurities entering the gas channel K. For example, Fig. 22 As shown in (a) in FIG. 1 , along the extension direction of the gas channel K, the widths of the plurality of first grooves 421 decrease sequentially.

[0189] Alternatively, if Fig. 22 As shown in (a), along the extension direction of the gas channel K, the widths of the plurality of first slots 421 extending along the second direction Y decrease in sequence, wherein the pole mounting hole 11 (see Figure 3) 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 upper surface (i.e., the first surface M) of the cover body 1, 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 421 decrease in sequence along the extension direction of the gas channel K, except for Fig. 22 In the manner shown in (a), that is, along the second direction Y, the width of a single first slot body 421 is consistent along the extension direction of the gas channel K, and the widths of the plurality of first slot bodies 421 decrease in sequence along the extension direction of the gas channel K. Alternatively, along the second direction Y, the width of a single first slot body 421 decreases in sequence along the extension direction of the gas channel K, and the widths of the plurality of first slot bodies 421 decrease in sequence along the extension direction of the gas channel K.

[0190] Alternatively, if Fig. 22 As shown in (b) , along the extension direction of the gas channel K, the widths of the plurality of second grooves 511 decrease sequentially.

[0191] Alternatively, if Fig. 22 As shown in (b), along the extension direction of the gas channel K, the widths of the plurality of second slots 511 extending along the second direction Y decrease in sequence, wherein the pole mounting hole 11 (see Figure 3 ) 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 upper surface (i.e., the first surface M) of the cover body 1, and the second direction Y is perpendicular to the first direction X. It can be understood that along the extension direction of the gas channel K, the widths of the plurality of second slots 511 extending along the second direction decrease in sequence, except for Fig. 22 In the manner shown in (b), that is, along the extension direction of the gas channel K, the width of a single second slot body 511 extending along the second direction Y is uniform, and the widths of the plurality of second slot bodies 511 extending along the second direction Y decrease sequentially. Alternatively, along the extension direction of the gas channel K, the width of a single second slot body 511 extending along the second direction Y decreases sequentially, and the widths of the plurality of second slot bodies 511 extending along the second direction Y decrease sequentially.

[0192] Alternatively, if Fig.23 As shown, along the extension direction of the gas channel K, the depths of the plurality of first slots 421 decrease sequentially. It is understandable that along the extension direction of the gas channel K, the depths of the plurality of first slots 421 decrease sequentially, and there may be a variety of implementations. For example, Fig.23 As shown in (a) of FIG. 1 , along the extension direction of the gas channel K, the depth of a single first groove body 421 is consistent, and the depths of the plurality of first groove bodies 421 decrease sequentially. Fig.23As shown in (b) , along the extension direction of the gas channel K, the depth of a single first groove body 421 decreases sequentially, and the depths of the plurality of first groove bodies 421 decrease sequentially.

[0193] Optionally, along the extension direction of the gas channel K, the depths of the plurality of second slots 511 decrease sequentially. It can be understood that along the extension direction of the gas channel K, the depths of the plurality of second slots 511 decrease sequentially, and there can be multiple implementations. For example, Fig.23 As shown in (a) of FIG. 1 , along the extension direction of the gas channel K, the depth of a single second groove body 511 is consistent, and the depths of the plurality of second groove bodies 511 decrease sequentially. Fig.23 As shown in (b) , along the extension direction of the gas channel K, the depth of a single second groove body 511 decreases sequentially, and the depth of a plurality of second groove bodies 511 decreases sequentially.

[0194] In this way, since the depths of the plurality of first grooves 421 and the plurality of second grooves 511, as well as the dimensions in the extension direction of the gas channel K and the thickness direction Z of the cover plate body 1, respectively, gradually decrease along the extension direction of the gas channel K, the dimensions of the first groove 421 closest to the edge of the upper plastic 4 and the second groove 511 closest to the edge of the pressing block 5 are minimized, which is beneficial to further reduce the opening of the gas channel K communicating with the outside air, and make the inside of the gas channel K larger than the outside, thereby facilitating further avoiding the situation where the gas channel K is blocked by external impurities.

[0195] Since the gas channel K needs to be connected to the pole mounting hole 11, there are many ways to connect. For example, the connection can be achieved by the clearance fit between the upper plastic 4 and the pole 2; or, the connection can be achieved by respectively opening a first guide groove and a second guide groove at the position of the pole 2 and the upper plastic 4 close to the pole mounting hole 11, etc., which will be described in detail below.

[0196] See also Figure 24 to Figure 25 , Fig.24 is a structural schematic diagram of a first sub-channel provided in an embodiment of the present application; Fig.25It is another structural schematic diagram of the first sub-channel provided in an embodiment of the present application. In some embodiments, the gas channel K includes a first sub-channel K1 and a second sub-channel K2 connected to the first sub-channel K1, the first sub-channel K1 is formed on the side of the upper plastic 4 adjacent to the pole mounting hole 11, and the first sub-channel K1 is connected to the pole mounting hole 11, and the connecting part of the first groove 42 and the second groove 51 forms a second sub-channel K2, and the second sub-channel K2 is configured to be connected to the outside air. The second sub-channel K2 formed by the pole mounting hole 11 and the first groove 42 and the second groove 51 are connected through the first sub-channel K1, thereby realizing the connection between the gas channel K 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 K and be detected by the instrument, thereby avoiding the inflow of batteries with substandard sealing performance for a long time, which is conducive to reducing the risk of safety accidents.

[0197] In a possible implementation, Fig.24 As shown, the first sub-channel K1 can be formed by the clearance fit between the upper plastic 4 and the pole 2. By setting the clearance fit between the upper plastic 4 and the pole 2 to form the first sub-channel K1, it is possible to avoid setting an additional structure to form the first sub-channel K1, which is beneficial to reduce the impact on the structural strength of the upper plastic 4 and the pole 2; and, the structure of the upper plastic 4 and the pole 2 is more concise, thereby facilitating the production and processing of the upper plastic 4 and the pole 2.

[0198] In some possible implementations, the gas channel K can be connected to the pole mounting hole 11 by respectively providing a first guide groove 44 and a second guide groove 21 on the upper plastic 4 and the pole 2 .

[0199] In one example, Fig.25 As shown in (a), a first guide groove 44 is opened on the inner wall surface of the upper plastic 4 close to the pole 2. The first guide groove 44 penetrates the upper plastic 4 along the thickness direction Z of the cover body 1. The first guide groove 44 is connected to the second sub-channel K2, and the first guide groove 44 forms a first sub-channel K1.

[0200] In another example, Fig.25 As shown in (b), a second guide groove 21 is opened on the side surface of the pole 2, and the second guide groove 21 extends along the thickness direction Z of the cover body 1. The second guide groove 21 is connected to the second sub-channel K2, and the second guide groove 21 forms the first sub-channel K1.

[0201] In another example, Fig.25As shown in (c), a first guide groove 44 is provided on the inner wall surface of the upper plastic 4 close to the pole 2, and the first guide groove 44 penetrates the upper plastic 4 along the thickness direction Z of the cover body 1. A second guide groove 21 is provided on the side circumferential surface of the pole 2, and the second guide groove 21 extends along the thickness direction Z of the cover body 1. The first guide groove 44 and the second guide groove 21 are both connected to the second sub-channel K2, and the first guide groove 44 and the second guide groove 21 form the first sub-channel K1.

[0202] The method of forming the first sub-channel K2 by the first guide groove 44 and the second guide groove 21 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 pole 2 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.

[0203] Optionally, the cover body 1 has a first surface M abutting against the upper plastic 4, and 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 K2 is connected to the first opening 11a. Since the first sub-channel K2 and the seal 3 are arranged at both ends of the pole mounting hole 11, it is possible to avoid the first sub-channel K2 passing through the position of the seal 3, and ensure that the first sub-channel K2 can be connected to the second sub-channel K3 from the seal 3, thereby ensuring that in the helium detection, if the seal 3 is not invalid, the helium will not flow out through the gas channel K; if the seal 3 fails, the helium can flow out through the pole mounting hole 11 through the gas channel K 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 conducive to avoiding the inflow of batteries with substandard sealing performance for a long time, and thus helping to reduce the risk of safety accidents.

[0204] See also Fig.26 and Fig. 27 , Fig.26 It is a schematic diagram of the structure of the upper plastic of multiple gas channels provided in an embodiment of the present application; Fig. 27It is a schematic diagram of the structure of the pressing block of multiple gas channels provided in the embodiment of the present application. In some embodiments, a plurality of first grooves 42 are provided, and the plurality of first grooves 42 are arranged at intervals around the center of the pole 2, and a plurality of second grooves 51 are provided corresponding to the plurality of first grooves 42, and each second groove 51 is respectively connected with the corresponding first groove 42 to form a plurality of gas channels K. The plurality of gas channels K are provided on the end cover assembly 100, which can avoid the situation where a single gas channel K is blocked and causes a false seal of the end cover assembly 100, thereby facilitating the improvement of the accuracy of the 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.

[0205] See also Fig.28 , Fig.28 is a schematic diagram of the structure of the battery provided by the embodiment of the present application. In the second aspect, the embodiment of the present application also discloses a battery 200, which includes a shell 201 and an end cap assembly 100 as described in the first aspect above, the shell 201 has an opening 202, and the end cap assembly 100 is configured to close the opening 202. The battery 200 with the end cap assembly 100 of the first aspect above can also detect the problem of missing seal 3 or sealing failure 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.

[0206] See also Fig.29 , Fig.29 It is a schematic diagram of the structure of the energy storage device provided in the embodiment of the present application. In the third aspect, the embodiment of the present application further discloses an energy storage device 300, which includes the battery 200 as described in the second aspect above. The energy storage device 300 may include but is not limited to a battery module, a battery pack, a battery system, etc. The energy storage device 300 having the battery 200 of the second aspect above also has the end cover assembly 100 of the first aspect above, which can also detect the problem of missing seal 3 or sealing failure through the detection equipment, thereby avoiding the long-term use of energy storage devices 300 with substandard sealing performance, which is beneficial to reduce the risk of safety accidents.

[0207] See also Fig.30 , Fig.30 : 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 discloses an electric device 400, which includes the battery 200 as described in the second aspect above, or the energy storage device 300 as described in the third aspect above. Specifically, the electric device 400 may include but is not limited to a vehicle, an energy storage system, an electronic product (such as a mobile phone, a laptop computer, a tablet computer, etc.).

[0208] The following description is made by taking the electrical equipment 400 as a household energy storage system as an example. Fig.30 As shown, the household energy storage system may include an electric energy conversion device 401, a user load 402, and a battery 200 or an energy storage device 300 as described above, wherein the battery 200 or the energy storage device 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 energy storage device 300 may be used as a small energy storage box, which may be mounted on an outdoor wall by wall-mounting. The photovoltaic panel may convert solar energy into electric energy during the period of low electricity prices. The battery 200 or the energy storage device 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.

[0209] 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: A cover plate body, wherein the cover plate body is provided with a pole mounting hole penetrating along a thickness direction of the cover plate body; A pole, the pole being inserted into the pole mounting hole; A sealing member, wherein the sealing member is sealingly connected between the pole and the pole mounting hole; An upper plastic, wherein the upper plastic is sleeved on the outer periphery of the pole and abuts against the cover body, and a first groove is provided on a side of the upper plastic away from the cover body; and A pressing block, the pressing block is sleeved on the outer periphery of the pole and abuts against the upper plastic, and a second groove is provided on a side of the pressing block close to the upper plastic; The opening of the second groove faces the opening of the first groove, and the second groove is partially staggered with the first groove, so that the part of the second groove communicating with the first groove together forms a gas channel, the gas channel is connected to the pole mounting hole, and the gas channel is configured to communicate with the outside air.

2. The end cap assembly according to claim 1, characterized in that: The first groove is configured to communicate with the outside air, or the second groove is configured to communicate with the outside air.

3. The end cap assembly according to claim 2, characterized in that: When the first groove is configured to communicate with the outside air, the depth of the first groove along the thickness direction of the cover body is less than the depth of the second groove; or, When the second groove is configured to communicate with the outside air, along the thickness direction of the cover plate 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 configured to communicate with the outside air, a blocking portion is provided at the edge of the first groove located at the upper plastic, and the blocking portion is configured to block at least a portion of the opening of the first groove communicating with the outside air; or, When the second groove is configured to communicate with the outside air, a blocking portion is provided at the edge of the second groove located at the pressing block, and the blocking portion is configured to block at least a portion of the opening of the second groove communicating with the outside air.

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 an edge of the pressing block and passes through the edge of the pressing block; or, The second groove extends along a first direction, and the first groove is located at an edge of the upper plastic and passes through 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 cover body.

6. The end cap assembly according to claim 1, characterized in that: A mounting groove is provided on one side of the upper plastic away from the cover body, the pressing block is arranged in the mounting groove, and the bottom surface of the pressing block abuts against the bottom surface of the mounting groove, and the side surface of the pressing block abuts against the inner wall surface of the mounting groove; The first groove is provided on the bottom surface of the installation groove and / or the inner wall surface of the installation groove, and the second groove is provided on the bottom surface of the pressing block and / or the side surface of the pressing block.

7. The end cap assembly according to claim 6, characterized in that: When the first groove is provided on the bottom surface of the installation groove and the inner wall surface of the installation groove, the second groove is located at the edge of the side surface of the pressing block away from the cover plate body and passes through the edge of the side surface of the pressing block; or, When the second groove is provided on the bottom surface and the side surface of the pressing block, the first groove is located at the edge of the inner wall of the installation groove away from the cover body and passes through the edge of the inner wall of the installation groove.

8. 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 spaced apart along the first direction, and each of the second groove bodies is staggered with the corresponding first groove body portion along the first direction, and the portion of each of the second groove bodies connected with the corresponding first groove bodies together forms the gas channel; Wherein, the first direction is the direction in which the pole mounting hole points to the edge of the cover body.

9. The end cap assembly according to claim 8, characterized in that: A mounting groove is provided on one side of the upper plastic away from the cover body, the pressing block is arranged in the mounting groove, and the bottom surface of the pressing block abuts against the bottom surface of the mounting groove, and the side surface of the pressing block abuts against the inner wall surface of the mounting groove; A plurality of the first groove bodies are arranged along the bottom surface of the installation groove toward the inner wall surface of the installation groove, and a plurality of the second groove bodies are arranged along the bottom surface of the pressing block toward the side surface of the pressing block.

10. The end cap assembly according to claim 8 or 9, characterized in that: A first rib is formed between two adjacent first grooves, and a projection of the first rib on the surface of the pressing block is located in the second groove; and A second rib is formed between two adjacent second grooves, and a projection of the second rib on the surface of the upper plastic is located in the first groove.

11. The end cap assembly according to claim 10, characterized in that: Along the extension direction of the gas channel, 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 groove body is 0.3-0.

5.

12. The end cap assembly according to claim 10, characterized in that: The projection of the second rib on the outer surface of the upper plastic separates 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 extension direction of the gas channel, the projection of the first rib on the outer surface of the pressing block separates 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 extension direction of the gas channel, the first connecting portion is connected to the fourth connecting portion, and the second connecting portion is connected to the third connecting portion; When the first slot body closest to the edge of the gas channel among the plurality of first slot bodies is configured to communicate with the outside air, along the extension direction of the gas channel, 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 width of the fourth connecting portion; or, Among the multiple second groove bodies, when the second groove body closest to the edge of the gas channel is configured to connect to the outside air, along the extension direction of the gas channel, the width of the first connecting part is greater than the width of the second connecting part, and the width of the third connecting part is smaller than the fourth connecting part.

13. The end cap assembly according to claim 8 or 9, characterized in that: Along the extension direction of the gas channel, the widths of the plurality of first slots decrease in sequence; and / or, Along the extension direction of the gas channel, the widths of the plurality of second slots decrease in sequence; and / or, Along the extension direction of the gas channel, the depths of the plurality of first grooves decrease in sequence; and / or, Along the extension direction of the gas channel, the depths of the plurality of second grooves decrease in sequence; and / or, Along the extension direction of the gas channel, the widths of the plurality of first slots extending along the second direction decrease in sequence; and / or, Along the extension direction of the gas channel, the widths of the plurality of second slots extending along the second direction decrease in sequence; 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 upper surface of the cover body, and the second direction is perpendicular to the first direction.

14. The end cap assembly according to claim 8 or 9, characterized in that: Along the extension direction of the gas channel, the width ratio of the first slot body to the second 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 first slot body to the second slot body is 1.2 to 1.5; 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 upper surface of the cover body, and the second direction is perpendicular to the first direction.

15. 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.

16. The end cap assembly according to claim 15, characterized in that The upper plastic is gap-matched with the pole to form the first sub-channel.

17. 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, and 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.

18. A battery, characterized in that: The invention comprises a shell and an end cap assembly according to any one of claims 1 to 17, wherein the shell has an opening, and the end cap assembly is configured to close the opening.

19. An energy storage device, characterized in that: Comprising a battery as claimed in claim 18.

20. An electrical equipment, characterized in that: Comprising the battery as claimed in claim 18 or the energy storage device as claimed in claim 19.

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