Battery

Abstract

The utility model provides a battery, and relates to the technical field of battery equipment, a shell of the battery is provided with a recess and an opening, a cover plate covers the opening, the recess and the cover plate jointly form a sealing cavity, the cover plate is provided with a notch groove, the outer edge of the cover plate is provided with a corner part, the notch groove is arranged close to the corner part, and a pole core assembly is arranged in the sealing cavity; a first shell body of the shell is provided with a first step, a liquid injection hole is formed in a first table top of the first step, a second shell body is connected with the first shell body, the first shell body and the second shell body are covered with the cover plate, the distance from the top face of the second shell body to the cover plate is larger than the distance from the top face of the first shell body to the cover plate, and the sealing structure is arranged on the first step face. The sealing structure is used for sealing the liquid injection hole, and the projection of the notch groove and the projection of the sealing structure are not overlapped in the thickness direction of the first step. The battery provided by the utility model can break through the cover plate through the notch groove and exhaust gas when a fault occurs, so that the battery is prevented from bulging and exploding, and the use safety of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more particularly to a battery. Background Technology

[0002] With the development of lithium-ion batteries, they are widely used in electrical equipment such as automobiles, mobile phones, drones, and power tools. If, during use, the battery undergoes abnormal internal chemical reactions due to overcharging or high temperatures, producing a large amount of gas that cannot be released, it can easily lead to battery bulging, combustion, and explosion, causing serious safety problems.

[0003] Therefore, there is an urgent need for a solution to address the problems of battery bulging and explosion in the aforementioned related technologies, in order to improve battery safety. Utility Model Content

[0004] This application provides a battery that can solve the problems of batteries easily bulging and exploding in the above-mentioned related technologies, and can improve the safety of battery use.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] A first aspect of this application provides a battery comprising:

[0007] The outer casing has a recess and an opening connecting the recess and the outside;

[0008] A cover plate is provided over the opening, and the recess and the cover plate together form a sealed cavity;

[0009] The cover plate has grooves, and the outer edge of the cover plate has corner portions, with the grooves located near the corner portions;

[0010] The core assembly is disposed within the sealed cavity;

[0011] The outer casing also includes:

[0012] The first housing has a first step, the first step has a first platform, and the first platform has an injection hole communicating with the sealing cavity;

[0013] The second housing is connected to the first housing;

[0014] The cover plate is placed on the first housing and the second housing, and the distance from the top surface of the second housing to the cover plate is greater than the distance from the top surface of the first housing to the cover plate;

[0015] A sealing structure is disposed on the first stepped surface, and the sealing structure is used to seal the injection hole;

[0016] Along the thickness direction of the first step, the projection of the groove is the same as the projection of the sealing structure.

[0017] This application provides a battery in which a cover plate is placed over an opening in the outer casing to form a sealed cavity for accommodating the core assembly. Grooves are formed on the cover plate to reduce the structural strength at the grooves. This allows the gas in the sealed cavity to burst through the cover plate through the grooves when the core assembly malfunctions and generates a large amount of gas, thus preventing the battery from bulging or exploding due to expansion and deformation of the outer casing and cover plate, thereby improving battery safety.

[0018] Furthermore, the outer casing includes a first housing and a second housing. The distance from the top surface of the second housing to the cover plate is greater than the distance from the top surface of the first housing to the cover plate. An injection hole is formed on the first stepped surface of the first housing, and a sealing structure is used to seal the injection hole. This reduces the impact of the sealing structure and other components on the overall thickness of the battery, thus reducing the battery's space occupancy. Additionally, it protects the sealing structure and other terminal components on the first housing from impacts with external electronic components.

[0019] In addition, by ensuring that the projection of the groove and the sealing structure in the thickness direction of the first step do not coincide, it is possible to ensure that the two do not interfere with each other, preventing the gas generated inside from dispersing during thermal runaway, which would prevent the groove and sealing structure from opening in time, thus causing the battery to explode.

[0020] Based on the above technical solution, the following improvements can be made to this application.

[0021] In one possible implementation, the groove is located near the junction of the cover plate and the housing.

[0022] In one possible implementation, the housing has sidewalls and a bottom wall, the sidewalls surrounding the outer periphery of the bottom wall to form the recess, the sidewalls forming the opening, and the cover plate being connected to the end face of the sidewalls facing the opening.

[0023] In one possible implementation, the distance from the groove to the inner surface of the sidewall of the housing is greater than or equal to 0 and less than or equal to 5 mm, and / or,

[0024] The ratio of the depth of the groove to the thickness of the cover plate is greater than 0.5 and less than or equal to 0.95, and / or

[0025] The groove can be at least one of the following: a straight groove, a polygonal groove, and a curved groove, and / or...

[0026] The groove extends along the direction of the outer edge of the cover plate, and / or,

[0027] In the direction perpendicular to the extension of the groove, the width of the groove opening is greater than the width of the groove bottom.

[0028] In one possible implementation, the sealing structure includes:

[0029] An adhesive layer is provided on the injection hole;

[0030] A separation layer is disposed on the side of the adhesive layer opposite to the injection hole. The separation layer is connected to the outer shell through the adhesive layer, and the separation layer seals the injection hole.

[0031] A connecting layer is disposed on the injection hole, and the adhesive layer is connected to the outer shell through the connecting layer. The connecting layer has a first through hole that communicates with the injection hole.

[0032] In one possible implementation, the connecting layer is an annular sheet having the first through hole;

[0033] The outer diameter of the annular plate is larger than the inner diameter of the injection hole;

[0034] And / or, the ratio of the outer diameter of the annular plate to the inner diameter of the injection hole is greater than or equal to 2 and less than or equal to 3.5;

[0035] And / or, the ratio of the inner diameter of the first through hole to the inner diameter of the injection hole is greater than or equal to 0.5 and less than or equal to 1.5.

[0036] In one possible implementation, the separation layer is a circular sheet;

[0037] The ratio of the outer diameter of the disc to the outer diameter of the connecting layer is greater than or equal to 0.5 and less than or equal to 0.8.

[0038] In one possible implementation, the adhesive layer is an annular structure, and the ratio of the outer diameter of the annular structure to the outer diameter of the disc is greater than or equal to 1 and less than or equal to 1.1.

[0039] And / or, the adhesive layer has a second through-hole, the ratio of the inner diameter of the second through-hole to the inner diameter of the first through-hole being greater than or equal to 0.5 and less than or equal to 1.

[0040] In one possible implementation, the thickness of the sealing structure is greater than or equal to 0.08 mm, and in the direction of the cover plate toward the second housing, the sealing structure does not protrude beyond the plane containing the surface of the second housing facing away from the cover plate.

[0041] In one possible implementation, the first platform is parallel to the cover plate; the orthographic projection of the sealing structure along the thickness direction of the outer shell lies within the first platform.

[0042] In one possible implementation, the battery further includes a negative terminal.

[0043] The negative electrode post is disposed on the first platform;

[0044] The negative electrode post and the sealing structure are spaced apart on the first platform;

[0045] Furthermore, along the thickness direction of the outer shell, the orthogonal projection of the negative electrode falls within the first platform.

[0046] In one possible implementation, along the length direction of the first step:

[0047] The distance between the negative electrode post and the sealing structure is greater than or equal to 0.3 mm and less than or equal to 3 mm;

[0048] The minimum distance from the sealing structure to the outer edge of the first step is greater than or equal to 0.3 mm and less than or equal to 2 mm;

[0049] The minimum distance from the negative electrode post to the outer edge of the first step is greater than or equal to 0.3 mm and less than or equal to 4 mm;

[0050] And / or, along the width direction of the first step, the difference between the width of the first step and the width of the sealing structure is greater than or equal to 0.9 mm and less than or equal to 6 mm;

[0051] And / or, the ratio of the distance from the first platform to the cover plate to the distance from the surface of the second housing facing away from the cover plate to the cover plate is greater than or equal to 0.2 and less than or equal to 0.5.

[0052] In one possible implementation, the first housing also has a second step, the second step having a second platform;

[0053] The battery also includes a positive electrode assembly, which is disposed on the second platform.

[0054] In the thickness direction of the outer shell, the second platform does not protrude beyond the plane containing the surface of the second shell facing away from the cover plate.

[0055] In one possible implementation, the ratio of the distance from the second platform to the cover plate to the distance from the surface of the second housing facing away from the cover plate to the cover plate is greater than or equal to 0.3 and less than or equal to 0.8.

[0056] In one possible implementation, along the length direction of the second step, the difference between the length of the second step and the length of the positive electrode component is greater than or equal to 0.9 mm and less than or equal to 5 mm. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0059] Figure 2 An exploded view of a battery provided in an embodiment of this application;

[0060] Figure 3 This is a structural schematic diagram of a battery from another angle, provided in an embodiment of this application.

[0061] Figure 4 for Figure 3 A partial schematic diagram at point P in the middle;

[0062] Figure 5 A diagram illustrating the relationship between the grooves in a battery and the sidewalls of the casing, provided as an embodiment of this application.

[0063] Figure 6 A schematic diagram of a battery cover and groove provided in an embodiment of this application;

[0064] Figure 7 A schematic diagram of a sealing structure for a battery provided in an embodiment of this application;

[0065] Figure 8 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0066] Figure 9 This is a structural schematic diagram of a battery from another perspective, provided in an embodiment of this application.

[0067] Figure 10 This is a structural schematic diagram of a battery from another perspective, provided in an embodiment of this application.

[0068] Figure 11 A cross-sectional view of a battery provided in an embodiment of this application;

[0069] Figure 12 This is a schematic diagram of the internal structure of a battery provided in an embodiment of this application;

[0070] Figure 13 This is a schematic diagram of the inner insulating sleeve of a battery positive electrode assembly provided in an embodiment of this application.

[0071] Explanation of reference numerals in the attached figures:

[0072] 100 - Outer shell;

[0073] 110 - Opening; 120 - Side wall; 130 - Bottom wall; 140 - Injection hole; 150 - First housing; 160 - Second housing;

[0074] 151 - First step; 152 - Second step;

[0075] 1511 - First tabletop; 1521 - Second tabletop;

[0076] 200-cover plate;

[0077] 300 - Groove;

[0078] 310 - Groove opening; 320 - Groove bottom;

[0079] 400-core module;

[0080] 410 - Positive electrode tab; 420 - Electrode core;

[0081] 500 - Sealed structure;

[0082] 510 - Adhesive layer; 520 - Separation layer; 530 - Connecting layer;

[0083] 531 - First via; 511 - Second via;

[0084] 600-Negative terminal;

[0085] 700 - Positive electrode component;

[0086] 710 - Positive terminal post; 720 - Outer insulating sleeve; 740 - Conductive connecting piece; 750 - Inner insulating sleeve;

[0087] 751 - First limiting component; 752 - Second limiting component; 753 - Support component. Detailed Implementation

[0088] As described in the background section, batteries in related technologies, during use, may experience abnormal internal chemical reactions due to overcharging or high temperatures, producing large amounts of gas that cannot be released. This can easily lead to battery bulging, combustion, and explosion, causing serious safety problems. The reason for this problem is that existing batteries cannot release the internal gas in a timely manner when problems occur, thus causing issues such as battery bulging and explosion.

[0089] To address the aforementioned technical problems, this application provides a battery in which a cover plate is placed over an opening in the outer casing to form a sealed cavity for accommodating the electrode core assembly. Grooves are formed in the cover plate and / or the outer casing, reducing the structural strength at the grooves. This allows the gas in the sealed cavity to burst through the cover plate and / or the outer casing through the grooves when the electrode core assembly malfunctions and generates a large amount of gas. This prevents the outer casing and cover plate from expanding and deforming, which could lead to battery bulging or explosion, thus improving battery safety.

[0090] Furthermore, the outer casing includes a first housing and a second housing, with the distance from the second housing to the cover plate being greater than the distance from the first housing to the cover plate. An injection hole is formed on the first stepped surface of the first housing, and a sealing structure is used to seal the injection hole. This reduces the impact of components such as the sealing structure on the first housing on the overall thickness of the battery, thus reducing the battery's space occupancy. Additionally, it protects the sealing structure on the first housing and other terminal components from impacts with external electronic components.

[0091] In addition, by ensuring that the projection of the groove and the sealing structure in the thickness direction of the first step do not coincide, it is possible to ensure that the two do not interfere with each other, preventing the gas generated inside from dispersing during thermal runaway, which would prevent the groove and sealing structure from opening in time, thus causing the battery to explode.

[0092] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0093] refer to Figures 1 to 4 This application provides a battery that may include a housing 100, a cover plate 200, and an electrode core assembly 400.

[0094] The outer casing 100 has a recess and an opening 110 connecting the interior and exterior of the recess, and the recess can accommodate the core assembly 400. Because the outer casing 100 has a recess and an opening 110, the outer casing 100 has a three-dimensional structure, and the structural strength of the outer casing 100 is higher than that of the cover plate 200.

[0095] A cover plate 200 is disposed over the opening 110, and the recess and the cover plate 200 together form a sealed cavity, in which the core assembly 400 is disposed. At least one of the housing 100 and the cover plate 200 has a groove 300, which is used to allow gas in the sealed cavity to break through the cover plate 200 and / or the housing 100 and be discharged.

[0096] In some embodiments, the groove 300 can also be formed on the housing 100 or the cover plate 200. When the battery fails, the gas in the sealed cavity can also break through the housing 100 through the groove 300 on the housing 100 or the cover plate 200 to release the gas in the sealed cavity.

[0097] In some embodiments, grooves 300 can be simultaneously formed on the housing 100 and the cover plate 200, so that when the battery fails, more outlets are provided for the gas in the sealed cavity, accelerating the release of gas in the sealed cavity and further reducing the risk of battery explosion.

[0098] Compared to the outer shell 100, the cover plate 200 can be a nearly two-dimensional plate structure. When the wall thickness of the cover plate 200 and the outer shell 100 are the same, and they are made of the same material, the structural strength of the cover plate 200 is weaker than that of the outer shell 100, making it more prone to deformation. Therefore, setting the groove 300 on the cover plate 200 allows gas inside the sealed cavity to easily break through the sealed cavity through the groove 300, improving the feasibility of the solution and enhancing battery safety.

[0099] This application provides a battery in which a cover plate 200 is placed over an opening 110 of a housing 100 to form a sealed cavity for accommodating a core assembly 400. A groove 300 is formed in the cover plate 200, reducing the structural strength at the groove 300. This allows the gas in the sealed cavity to burst through the cover plate 200 through the groove 300 when the core assembly 400 malfunctions and generates a large amount of gas. This prevents the housing 100 and cover plate 200 from expanding and deforming, which could lead to battery bulging or explosion, thus improving battery safety.

[0100] Furthermore, by setting grooves 300 on the cover plate 200 or the outer casing 100, and allowing the gas in the sealed cavity to break through the grooves 300, the controllability of battery rupture and pressure relief can be achieved, thereby improving the safety of battery use.

[0101] refer to Figures 3 to 5In some embodiments, the groove 300 is located near the connection between the cover plate 200 and the outer shell 100. In this way, since the stress at the connection between the cover plate 200 and the outer shell 100 is relatively complex, the connection between the cover plate 200 and the outer shell 100 becomes a stress concentration area. The groove 300 located near the connection between the cover plate 200 and the outer shell 100 will further increase the stress concentration effect.

[0102] refer to Figure 5 In some embodiments, the orthographic projection of the groove 300 is located within the opening 110 in the thickness direction of the housing 100. This avoids the problem that the gas in the sealed cavity cannot flow to the position on the cover plate 200 or the housing 100 corresponding to the groove 300 because the groove 300 is located at the connection surface between the cover plate 200 and the housing 100, thus preventing the gas from breaking through the groove 300 and being discharged.

[0103] refer to Figure 2 and Figure 5 In some embodiments, the housing 100 has a sidewall 120 and a bottom wall 130. The sidewall 120 surrounds the outer periphery of the bottom wall 130 to form a recess, and the sidewall 120 forms an opening 110. The cover plate 200 is connected to the end face of the sidewall 120 facing the opening 110. When the housing 100 has a groove 300, the groove 300 can be provided in the bottom wall 130. The groove 300 can also be provided in the sidewall 120 of the housing 100.

[0104] When the cover plate 200 has a groove 300, the distance from the groove 300 to the inner surface of the side wall 120 of the outer casing 100 (e.g.) Figure 5 (L1) is greater than or equal to 0 and less than or equal to 5 mm. For example, the distance from the groove 300 to the inner surface of the side wall 120 of the housing 100 can be one of 1 mm, 1.5 mm, 2.1 mm, 2.7 mm, 3.3 mm, 4.2 mm, and 4.9 mm. Alternatively, the distance from the groove 300 to the inner surface of the side wall 120 of the housing 100 can be any value within the range of greater than or equal to 0 and less than or equal to 5 mm.

[0105] This avoids a large distance between the groove 300 and the inner surface of the side wall 120 of the outer casing 100. In the event of a failure of the core assembly 400, the gas generated in the sealed cavity is prevented from having difficulty breaking through the groove 300, thus improving the practicality of the battery.

[0106] refer to Figure 4 and Figure 5 In some embodiments, the groove 300 extends along the extension direction of the outer edge of the cover plate 200, so that the shortest distance from any point in the length direction of the groove 300 to the outer edge of the cover plate 200 is equal, making the force on the cover plate 200 at the groove 300 more uniform, and facilitating the gas to break through the groove 300.

[0107] In some embodiments, the groove 300 can be at least one of a straight groove, a zigzag groove, and a curved groove. The extension path of the groove 300 can be the same as the extension path of the outer edge of the cover plate 200. If the edge of the cover plate 200 corresponding to the groove 300 is a straight edge, then the length extension path of the groove 300 can be straight, and the extension path of the groove 300 is parallel to the corresponding straight edge of the cover plate 200. If the outer edge of the cover plate 200 has a corner, and the extension direction of the corner is zigzag, then the length extension path of the groove 300 can also be a zigzag groove 300 corresponding to the extension direction of the corner.

[0108] refer to Figure 6 In some embodiments, the depth of the groove 300 is less than the thickness of the cover plate 200. The depth of the groove 300 (e.g.) Figure 6 The thickness of H1 and cover plate 200 (e.g.) Figure 6 The ratio of the depth of the groove 300 to the thickness of the cover plate 200 is greater than 0.5 and less than or equal to 0.95. For example, the ratio of the depth of the groove 300 to the thickness of the cover plate 200 can be one of 0.52, 0.6, 0.7, and 0.8. Alternatively, the ratio of the depth of the groove 300 to the thickness of the cover plate 200 can be any value within the range of greater than 0.5 and less than or equal to 0.95.

[0109] In this way, by setting the ratio of the depth of the groove 300 to the thickness of the cover plate 200 in the range of greater than 0.5 and less than or equal to 0.95, it is possible to avoid the cover plate 200 at the groove 300 being too thick due to the ratio being too small, which would be unfavorable for the gas in the sealing cavity to break through the groove 300. It is also possible to avoid the cover plate 200 at the groove 300 being too weak due to the depth of the groove 300, which would easily lead to the cover plate 200 cracking and damage, thus ensuring the structural strength of the cover plate 200.

[0110] refer to Figure 6 In some embodiments, in the thickness direction of the housing 100, the orthographic projection of the groove bottom 320 of the groove 300 lies within the orthographic projection of the outline of the groove opening 310 of the groove 300. For example, in the extension direction perpendicular to the groove 300, the width of the groove opening 310 of the groove 300 (e.g. Figure 6 The width of the groove bottom 320 (M1) is greater than the groove bottom 320 (e.g., M1) of the groove 300. Figure 6 (M2), which makes it easier for the cover plate 200 at the groove 300 to be broken through, and also makes it easier for gas to be discharged from the sealed cavity.

[0111] refer to Figure 1 , Figure 2 , Figure 7 and Figure 8In some embodiments, the battery may further include a sealing structure 500, wherein the outer casing 100 has an injection hole 140 communicating with the sealing cavity, and the sealing structure 500 is used to seal the injection hole 140. The sealing structure 500 is parallel to the cover plate 200.

[0112] In this way, by making the sealing structure 500 parallel to the cover plate 200, the surface of the sealing structure 500 facing away from the injection hole 140 can be parallel to the cover plate 200, which facilitates the assembly process of the sealing structure 500 with the outer shell 100 and the cover plate 200.

[0113] In some embodiments, the projection of the groove 300 and the projection of the sealing structure 500 do not overlap in the thickness direction of the housing 100, and the orthographic projection of the groove 300 does not overlap with the orthographic projection of the injection hole 140. This ensures that the groove 300 and the sealing structure 500 do not interfere with each other, preventing the dispersion of internally generated gas during thermal runaway, which could prevent both the groove 300 and the sealing structure 500 from opening in time, thus leading to a battery explosion.

[0114] In other embodiments, the groove 300 is spaced apart from the sealing structure 500 in the thickness direction perpendicular to the housing 100, or the groove 300 can be provided on the cover plate 200 in a region away from the groove 300.

[0115] Thus, for reference Figure 7 and Figure 8 In some embodiments, the sealing structure 500 may include an adhesive layer 510 and a separation layer 520.

[0116] An adhesive layer 510 is disposed on the injection hole 140. The adhesive layer 510 can be a hot melt adhesive or a layered structure with adhesive properties.

[0117] The separation layer 520 is disposed on the side of the adhesive layer 510 facing away from the injection hole 140. The separation layer 520 is connected to the outer shell 100 through the adhesive layer 510, and the separation layer 520 is used to seal the injection hole 140.

[0118] In this way, by adopting a split structure and bonding the separation layer 520 to the outer casing 100 through the adhesive layer 510, the sealing structure 500 can ensure the connection stability between the separation layer 520 and the outer casing 100. However, when the battery fails and gas and high temperature are generated in the sealed cavity, the connection strength between the separation layer 520, the adhesive layer 510, and the outer casing 100 is reduced. This allows the gas in the sealed cavity to break through the separation layer 520 and the adhesive layer 510 and be discharged from the injection hole 140, thereby improving the pressure relief efficiency of the battery during failure and improving the safety of battery use.

[0119] refer to Figure 7 and Figure 8In some embodiments, the sealing structure 500 may further include a connecting layer 530, which covers the injection hole 140. The adhesive layer 510 is connected to the housing 100 through the connecting layer 530. The connecting layer 530 has a first through hole 531 that communicates with the injection hole 140.

[0120] In practical implementation, when hot melt adhesive is used for the adhesive layer 510, the sealing structure 500 can be assembled first. For example, the connecting layer 530 and the separating layer 520 can be connected through the adhesive layer 510, and then the connecting layer 530 can be welded to the outer shell 100 around the injection hole 140. This avoids the problem of the hot melt adhesive temperature being too high during the bonding process when the separating layer 520 is bonded to the outer shell 100, which could affect the core assembly 400, thus improving the safety of the assembly process.

[0121] The connecting layer 530 is connected to the outer casing 100 by welding. In the event of a battery failure, the bonding layer 510 will have reduced connection strength due to high temperature. Under the action of gas in the sealed cavity, the separating layer 520 and the bonding layer 510 will be broken, causing the bonding layer 510 and the connecting layer 530 to separate, thereby allowing the gas to be discharged through the first through hole 531 on the connecting layer 530.

[0122] In some embodiments, the connecting layer 530 may be made of stainless steel or nickel. The adhesive layer 510 may be made of one of rubber, polypropylene (PP), and polyethylene terephthalate (PET). The separating layer 520 may be made of stainless steel, nickel, or aluminum.

[0123] refer to Figure 7 In some embodiments, the connecting layer 530 is an annular plate with a first through hole 531, which can be concentrically arranged with the injection hole 140. The outer diameter of the annular plate (e.g., Figure 7 The inner diameter of the injection hole (R1) is greater than that of the injection hole 140 (e.g., Figure 7 (r1). This ensures the stability of the connection between the connecting layer 530 and the outer shell 100 around the injection hole 140.

[0124] In a specific implementation, the ratio of the outer diameter of the annular plate to the inner diameter of the injection hole 140 is greater than or equal to 2 and less than or equal to 3.5. For example, it can be one of 2, 2.1, 2.5, 2.7, and 3.3. Alternatively, the ratio of the outer diameter of the annular plate to the inner diameter of the injection hole 140 can be any value within the range of greater than or equal to 2 and less than or equal to 3.5.

[0125] This avoids the connection stability between the connecting layer 530 and the outer casing 100 being affected by an excessively small ratio between the outer diameter of the annular plate and the inner diameter of the injection hole 140. It also avoids the problem of an excessively large annular plate size affecting battery costs due to an excessively large ratio between the outer diameter of the annular plate and the inner diameter of the injection hole 140.

[0126] refer to Figure 7 In some embodiments, the inner diameter of the first via 531 (e.g.) Figure 7 (r2) and the inner diameter of injection hole 140 (e.g.) Figure 7 The ratio of the inner diameter of the first through hole 531 to the inner diameter of the injection hole 140 can be greater than or equal to 0.5 and less than or equal to 1.5. For example, it can be one of 0.6, 0.7, 0.9, 1.2 and 1.4. Alternatively, the ratio of the inner diameter of the first through hole 531 to the inner diameter of the injection hole 140 can be any value within the range of greater than or equal to 0.5 and less than or equal to 1.5.

[0127] This avoids the problem of insufficient surface area on the connecting layer 530 for connection with the outer shell 100 due to an excessively small ratio between the inner diameter of the first through hole 531 and the inner diameter of the injection hole 140, which would affect the connection stability between the connecting layer 530 and the outer shell 100. It also avoids the problem of insufficient inner diameter of the first through hole 531 due to an excessively large ratio between the inner diameter of the first through hole 531 and the inner diameter of the injection hole 140, which would affect the efficiency of gas discharge from the first through hole 531.

[0128] refer to Figure 7 In some embodiments, the separation layer 520 can be a disc, and the outer diameter of the disc (e.g., ...) Figure 7 R2) is smaller than the outer diameter of the connecting layer 530 (e.g. Figure 7 (R1). The ratio of the outer diameter of the disc to the outer diameter of the connecting layer 530 is greater than or equal to 0.5 and less than or equal to 0.8, for example, one of 0.5, 0.6, 0.7, and 0.8. Alternatively, the ratio of the outer diameter of the disc to the outer diameter of the connecting layer 530 can be any value within the range of greater than or equal to 0.5 and less than or equal to 0.8.

[0129] In this way, when the battery fails, the gas in the sealed cavity can easily break through the delamination and adhesive layer 510 and be discharged off the gas sideways.

[0130] refer to Figure 7 In some embodiments, the adhesive layer 510 is an annular structure, and the outer diameter of the annular structure (e.g., Figure 7 (R3) and the outer diameter of the disc (e.g., R ... Figure 7 The ratio of the outer diameter of the annular structure to the outer diameter of the circular plate can be any value within the range of 1 to 1.1.

[0131] This increases the connection area between the adhesive layer 510 and the release layer 520, improves the connection stability between the adhesive layer 510 and the release layer 520, and enhances the sealing capability of the sealing structure 500 for the injection hole 140.

[0132] The adhesive layer 510 has a second through hole 511, the inner diameter of the second through hole 511 (e.g.) Figure 7 (middle r3) and the inner diameter of the first through hole 531 (e.g. Figure 7 The ratio of the inner diameter of the second via 511 to the inner diameter of the first via 531 can be any value within the range of 0.5 to 1.

[0133] refer to Figure 1 , Figure 2 and Figure 7 In some embodiments, the housing 100 may include a first housing 150 and a second housing 160.

[0134] The injection port 140 is formed in the first housing 150, and the sealing structure 500 is disposed on the injection port 140 in the first housing 150. The second housing 160 is connected to the first housing 150. Alternatively, the first housing 150 and the second housing 160 can be an integral structure. The cover plate 200 covers the first housing 150 and the second housing 160, and the distance from the second housing 160 to the cover plate 200 (e.g., Figure 7 The distance from the first housing 150 to the cover plate 200 (H4) is greater than the distance from the first housing 150 to the cover plate 200 (e.g.) Figure 7 (H3).

[0135] It is understood that the distance from the top surface of the first housing 150 to the cover plate 200 can be the distance between the outer surface of the first housing 150 facing away from the cover plate 200 and the inner surface of the cover plate 200 facing the interior of the sealing cavity. The distance from the top surface of the second housing 160 to the cover plate 200 can be the distance between the outer surface of the second housing 160 facing away from the cover plate 200 and the inner surface of the cover plate 200.

[0136] In this way, by making the distance from the top surface of the second housing 160 to the cover plate 200 greater than the distance from the top surface of the first housing 150 to the cover plate 200, the impact of components such as the sealing structure 500 provided on the first housing 150 on the total thickness of the battery can be reduced, thereby reducing the battery's space occupancy rate. Furthermore, it can protect the sealing structure 500 and other terminal components on the first housing 150 from impacts with external electronic components.

[0137] In some embodiments, the groove 300 can be provided on the cover plate 200 at a position corresponding to the first housing 150, so that gas in the sealed cavity can be released from the groove 300 corresponding to the first housing 150.

[0138] refer to Figure 7 In some embodiments, the thickness of the sealing structure 500 (e.g.) Figure 7 The thickness of the sealing structure 500 (H7) is greater than or equal to 0.08 mm. This ensures that the sealing structure 500 is at least 0.08 mm thick, preventing deformation and damage due to excessive thinness, which could affect the sealing performance of the injection hole 140 and improve battery safety.

[0139] In some examples, the sealing structure 500 does not protrude from the plane containing the surface of the second housing 160 facing away from the cover plate 200 in the direction of the cover plate 200 toward the second housing 160. This avoids the sealing structure 500 protruding from the plane containing the outer surface of the second housing 160 in the thickness direction of the housing 100, thus preventing the sealing structure 500 from increasing the overall thickness of the battery and reducing the battery's space utilization.

[0140] refer to Figure 2 and Figure 9 In some embodiments, the first housing 150 has a first step 151. The first step 151 has a first platform 1511, an injection hole 140 is formed on the first step 151, and a sealing structure 500 is disposed on the first platform 1511. The first platform 1511 is parallel to the cover plate 200. Along the thickness direction of the housing 100, the orthographic projection of the sealing structure 500 is completely located within the first platform 1511.

[0141] In this way, the sealing structure 500 can be completely located on the first platform 1511 of the first step 151, ensuring that the sealing structure 500 does not protrude from the first platform 1511, increasing the contact area between the sealing structure 500 and the first platform 1511, and reducing the probability of the sealing structure 500 detaching from the first platform 1511.

[0142] In some embodiments, the groove 300 can be offset from the sealing structure 500 on the first platform 1511 in the thickness direction of the housing 100, and along the length direction of the first step 151, the groove 300 is located on the side of the first step 151 away from the sealing structure 500.

[0143] In this way, while ensuring that gas can leak from the area of ​​the cover plate 200 corresponding to the first housing 150, the sealing structure 500 at the injection hole 140 is prevented from being blown open due to excessive gas pressure in the sealing cavity.

[0144] refer to Figure 9In some embodiments, the battery may further include a negative terminal 600. The negative terminal 600 is disposed on the first platform 1511 and is electrically connected to the electrode core assembly 400. The negative terminal 600 and the sealing structure 500 are spaced apart on the first platform 1511. Thus, by spaced apart the negative terminal 600 and the sealing structure 500 on the first platform 1511, mutual interference between the sealing structure 500 and the negative terminal 600 can be reduced, facilitating the installation of the sealing structure 500 and the negative terminal 600 on the first platform 1511.

[0145] refer to Figure 9 and Figure 10 In some embodiments, along the length direction of the first step 151 (e.g.) Figure 10 (Center direction X), the spacing between the negative terminal 600 and the sealing structure 500 (e.g., ... Figure 10 (As shown in L2) The distance between the negative terminal 600 and the sealing structure 500 can be greater than or equal to 0.3 mm and less than or equal to 3 mm, for example, one of 0.4 mm, 0.9 mm, 1.4 mm, 1.8 mm, 2.2 mm and 2.7 mm. Alternatively, the distance between the negative terminal 600 and the sealing structure 500 can be one of the following within the range of greater than or equal to 0.3 mm and less than or equal to 3 mm.

[0146] Along the thickness direction of the outer casing 100, the orthogonal projection of the negative terminal 600 falls entirely within the first platform 1511. This ensures that the negative terminal 600 is completely positioned on the first platform 1511, increasing the connection area between the negative terminal 600 and the first platform 1511, improving the connection stability between the negative terminal 600 and the first platform 1511, and preventing interference between the negative terminal 600 and other components of the electrical equipment when a portion of the negative terminal 600 extends beyond the first platform 1511.

[0147] In some embodiments, the first tabletop 1511 has two ends in the length direction and two ends in the width direction. When the sealing structure 500 is located on the first tabletop 1511, there is a certain gap between the sealing structure 500 and the two ends in the width direction of the first tabletop 1511, and there is also a gap between the sealing structure 500 and the two ends in the width direction of the first tabletop 1511.

[0148] In other embodiments, the negative terminal 600 may be spaced apart from both ends of the first platform 1511 in the width direction, and the negative terminal 600 may also be spaced apart from both ends of the first platform 1511 in the width direction.

[0149] refer to Figure 10 In some embodiments, along the length direction of the first step 151 (e.g.) Figure 10 (Center direction X), the minimum distance from the outer edge of the negative terminal 600 to the first step 151 (e.g.) Figure 10 (As shown in L3) The distance is greater than or equal to 0.3 mm and less than or equal to 4 mm, for example, one of 0.4 mm, 0.9 mm, 1.2 mm, 1.5 mm, 1.8 mm, 1.9 mm, 2.5 mm, 3.1 mm, and 3.9 mm. Alternatively, the minimum distance from the negative electrode post 600 to the outer edge of the first step 151 can be one of the following ranges: greater than or equal to 0.3 mm and less than or equal to 4 mm.

[0150] In some embodiments, the minimum distance (not shown in the figure) from the sealing structure 500 to the outer edge of the first step 151 is greater than or equal to 0.3 mm and less than or equal to 2 mm, for example, one of 0.4 mm, 0.9 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 1.9 mm. Alternatively, the minimum distance from the sealing structure 500 to the outer edge of the first step 151 can be one of the ranges greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0151] Along the width direction of the first step 151 (e.g.) Figure 10 (Z) width of the first step 151 (e.g.) Figure 10 (as shown in L6) and the width of the sealing structure 500 (as shown in L6) Figure 10 The difference between the width of the first step 151 and the width of the sealing structure 500 (as shown in L7) is greater than or equal to 0.9 mm and less than or equal to 6 mm, for example, one of 1.0 mm, 1.6 mm, 2.4 mm, 3.7 mm, 4.3 mm, and 5.8 mm. Alternatively, the difference between the width of the first step 151 and the width of the sealing structure 500 can be any value within the range of greater than or equal to 0.9 mm and less than or equal to 6 mm.

[0152] In other embodiments, the distance from the first platform 1511 to the cover plate 200 (e.g.) Figure 9 (H3), the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200 (e.g., H3), and the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200. Figure 9 The ratio of H4 to the distance from the first platform 1511 to the cover plate 200 to the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200 can be any value within the range of 0.2 to 0.5.

[0153] In some embodiments, the distance from the first tabletop 1511 to the cover plate 200 can be equal to the distance from the first housing 150 to the cover plate 200.

[0154] This avoids the problem of the first platform 1511 protruding from the plane of the outer surface of the second housing 160, and also avoids the first platform 1511 affecting the thickness and space occupancy of the battery.

[0155] refer to Figure 9 and Figure 10 In some embodiments, the first housing 150 further has a second step 152, the second step 152 having a second mesa 1521. The battery may also include a positive electrode assembly 700 disposed on the second mesa 1521. In the thickness direction of the housing 100 (e.g. Figure 9 In the Y direction, the distance from the second platform 1521 to the cover plate 200 (e.g.) Figure 9 The distance from the first tabletop 1511 to the cover plate 200 (e.g., H5) is greater than the distance from the first tabletop 1511 to the cover plate 200. Figure 9 (H3), and the second platform 1521 does not protrude from the plane of the surface of the second housing 160 facing away from the cover plate 200.

[0156] In some examples, when the sealing structure 500, the negative terminal 600, and the positive terminal assembly 700 are all located on the first housing 150, the sealing structure 500, the negative terminal 600, and the positive terminal assembly 700 can be arranged at intervals on the first housing 150, and the sealing structure 500 can be located between the negative terminal 600 and the positive terminal assembly 700.

[0157] In this way, by setting the second step 152 and placing the positive electrode component 700 on the second step 152, and making the distance from the second platform 1521 to the cover plate 200 greater than the distance from the first platform 1511 to the cover plate 200, the second step 152 can be higher than the first step 151, which facilitates the placement of the positive electrode component 700 on the first housing 150 and facilitates the electrical connection between the positive electrode component 700 and the electrode core component 400.

[0158] By making the height of the first step 151 different from the height of the second step 152, it is easier to position and install the positive electrode component 700, and it is also easier to position and install the negative electrode component and the sealing structure 500 on the first step 151.

[0159] Furthermore, by ensuring that the second platform 1521 does not protrude beyond the plane of the surface of the second housing 160 facing away from the cover plate 200, the impact on the battery thickness when the positive electrode assembly 700 is installed on the second step 152 can be avoided, thereby reducing the battery's space occupancy rate.

[0160] refer to Figure 9 In some embodiments, the distance from the second platform 1521 to the cover plate 200 (e.g.) Figure 9 (H5), the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200 (e.g., H5), and the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200. Figure 9The ratio of H4 to the distance from the second platform 1521 to the cover plate 200 to the distance from the surface of the second housing 160 facing away from the cover plate 200 to the cover plate 200 can be one of the values ​​within the range of 0.3 to 0.8.

[0161] This avoids the positive electrode component 700 protruding from the plane of the outer surface of the second housing 160 due to an excessively small ratio, and also avoids the second step 152 being too low due to an excessively large ratio, which would affect the assembly of the positive electrode component 700 and the core component 400.

[0162] refer to Figure 10 In some embodiments, the width of the second step 152 is equal to the width of the first step 151. This facilitates the processing of the housing 100 and reduces the manufacturing cost of the housing 100 and the battery.

[0163] refer to Figure 10 In some embodiments, the positive electrode assembly 700 is completely located within the second mesa 1521 in the thickness direction of the housing 100. This can increase the connection area between the positive electrode assembly 700 and the second mesa 1521, and improve the connection stability between the positive electrode assembly 700 and the second mesa 1521.

[0164] Along the length direction of the second step 152, the length of the second step 152 (e.g.) Figure 10 (as shown in L4) and the length of the positive electrode component 700 (as shown in L4) Figure 10 The difference between the length of the second step 152 and the length of the positive electrode component 700 (as shown in L5) is greater than or equal to 0.9 mm and less than or equal to 5 mm, for example, it can be one of 1 mm, 1.5 mm, 2 mm, 2.4 mm, 3 mm, 3.6 mm, 4 mm and 4.7 mm. Alternatively, the difference between the length of the second step 152 and the length of the positive electrode component 700 can be any value within the range of greater than or equal to 0.9 mm and less than or equal to 5 mm.

[0165] It is understandable that the minimum length of the second step 152 can be the length of the positive electrode component 700 plus 0.5mm, and the maximum length of the second step 152 can be the length of the positive electrode component 700 plus 5mm. The length of the second step 152 can be any value within the range of greater than or equal to 0.9mm and less than or equal to 5mm added to the length of the positive electrode component 700.

[0166] refer to Figure 10 In some embodiments, the battery may further include a positive electrode assembly 700 disposed in the housing 100 and used for electrically connecting the electrode core assembly 400. The positive electrode assembly 700 may include a positive electrode post 710 and an outer insulating sleeve 720.

[0167] The positive terminal 710 is disposed on the housing 100 and electrically connected to the core assembly 400 inside the housing 100. The outer insulating sleeve 720 is disposed between the positive terminal 710 and the housing 100, and the outer insulating sleeve 720 is used to insulate between the housing 100 and the positive terminal 710.

[0168] In this way, by setting the outer insulating sleeve 720 between the positive terminal 710 and the outer insulating sleeve 720, a short circuit between the positive terminal 710 and the outer casing 100 can be avoided, thereby improving the safety of battery use.

[0169] refer to Figure 2 and Figure 11 In some embodiments, the positive electrode assembly 700 may further include a conductive connecting piece 740. The conductive connecting piece 740 is disposed on the inner wall of the housing 100 and is electrically connected to the positive electrode post 710.

[0170] The electrode assembly 400 may include a positive electrode tab 410 and an electrode core 420, with a conductive connecting piece 740 electrically connected to the positive electrode tab 410. An inner insulating sleeve 750 is disposed between the conductive connecting piece 740 and the inner wall of the housing 100, and the inner insulating sleeve 750 is used to insulate the conductive connecting piece 740 from the inner wall of the housing 100.

[0171] In this way, by setting the inner insulating sleeve 750, the conductive connecting piece 740 can be insulated from the inner wall of the outer casing 100, thus preventing short circuits between the conductive connecting piece 740 and the inner wall of the outer casing 100 and improving the safety of battery use.

[0172] refer to Figure 12 and Figure 13 In some embodiments, the inner insulating sleeve 750 has a first limiting member 751 on the surface facing away from the outer insulating sleeve 720. The first limiting member 751 is disposed between the electrode core assembly 400 and the conductive connecting piece 740, and the first limiting member 751 is used to insulate the conductive connecting piece 740 from the electrode core 420.

[0173] In this way, by setting the first limiting member 751, it is possible to prevent short circuit between the conductive connecting piece 740 and the electrode core 420 while ensuring that the conductive connecting piece 740 can be electrically connected to the positive electrode tab 410, thereby improving the safety of battery use.

[0174] The first limiting member 751 can be a raised rib structure to separate the conductive connecting piece 740 from the electrode core 420, preventing short circuits between the conductive connecting piece 740 and the electrode core 420. The raised rib structure can also improve the structural strength of the inner insulating sleeve 750, reducing the probability of deformation of the inner insulating sleeve 750.

[0175] refer to Figure 12 and Figure 13 In some embodiments, the inner insulating sleeve 750 has a second limiting member 752 on the surface facing away from the outer insulating sleeve 720, which is spaced apart from the first limiting member 751. The second limiting member 752 is located on the side of the first limiting member 751 facing away from the pole core 420. A conductive connecting piece 740 is disposed between the first limiting member 751 and the second limiting member 752, and the second limiting member 752 is used to insulate the conductive connecting piece 740 from the outer casing 100.

[0176] In this way, by setting the second limiting member 752, short circuits between the conductive connecting piece 740 and the inner wall of the outer casing 100 can be avoided, thereby improving the safety of battery use.

[0177] In some examples, the second limiting member 752 may also be a rib structure provided on the surface of the inner insulating sleeve 750.

[0178] refer to Figure 12 and Figure 13 In some embodiments, the inner insulating sleeve 750 has at least one support member 753 on the surface facing away from the outer insulating sleeve 720. One end of the support member 753 is disposed in the inner insulating sleeve 750, and the other end extends toward the cover plate 200 to prevent the positive electrode tab 410 from contacting the cover plate 200.

[0179] In some embodiments, the support member 753 may be spaced apart from the first limiting member 751 and the second limiting member 752 on the surface of the inner insulating sleeve 750, which facilitates the flow of electrolyte.

[0180] In some embodiments, the number of support members 753 may be one, two, three, or more. This application does not impose specific limitations on this.

[0181] In this way, by setting the support member 753, a support can be formed between the inner insulating sleeve 750 and the cover plate 200, and the positive electrode tab 410 can be prevented from short-circuiting with the inner wall of the cover plate 200, thus improving the safety of battery use.

[0182] refer to Figure 12 and Figure 13 In some embodiments, along the thickness direction of the inner insulating sleeve 750, the height of the support member 753 is greater than the height of the first limiting member 751 and the second limiting member 752. This prevents the first limiting member 751 and the second limiting member 752 from being deformed by compression.

[0183] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0184] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0185] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0186] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0187] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: The outer casing (100) has a recess and an opening (110) connecting the recess and the outside; A cover plate (200) is provided over the opening (110), and the recess and the cover plate (200) together form a sealed cavity; The cover plate (200) has a groove (300), and the outer edge of the cover plate has a corner portion. The groove (300) is located near the corner portion. The core assembly (400) is disposed within the sealed cavity; The housing (100) further includes: The first housing (150) has a first step (151), the first step (151) has a first platform (1511), and the first platform (1511) has an injection hole (140) communicating with the sealing cavity. The second housing (160) is connected to the first housing (150); The cover plate (200) is disposed on the first housing (150) and the second housing (160), and the distance from the top surface of the second housing (160) to the cover plate (200) is greater than the distance from the top surface of the first housing (150) to the cover plate (200); A sealing structure (500) is disposed on the first platform (1511), and the sealing structure (500) seals the injection hole (140); Along the thickness direction of the first step (151), the projection of the groove (300) does not coincide with the projection of the sealing structure (500).

2. The battery according to claim 1, characterized in that, The groove (300) is provided near the connection between the cover plate (200) and the outer shell (100).

3. The battery according to claim 2, characterized in that, The outer casing (100) has a side wall (120) and a bottom wall (130), the side wall (120) surrounding the outer periphery of the bottom wall (130) to form the recess, the side wall (120) surrounding the opening (110), and the cover plate (200) being connected to the end face of the side wall (120) facing the opening (110).

4. The battery according to claim 3, characterized in that, The distance from the groove (300) to the inner surface of the sidewall (120) of the outer casing (100) is greater than or equal to 0 and less than or equal to 5 mm, and / or, The ratio of the depth of the groove (300) to the thickness of the cover plate (200) is greater than 0.5 and less than or equal to 0.95, and / or, The groove (300) can be at least one of a straight groove, a polygonal groove, and a curved groove, and / or, The groove (300) extends along the extension direction of the outer edge of the cover plate (200), and / or, In the direction perpendicular to the extension of the groove (300), the width of the groove opening (310) is greater than the width of the groove bottom (320).

5. The battery according to claim 1, characterized in that, The sealing structure (500) includes: An adhesive layer (510) is disposed on the injection hole (140); A separation layer (520) is disposed on the side of the adhesive layer (510) facing away from the injection hole (140). The separation layer (520) is connected to the outer shell (100) through the adhesive layer (510), and the separation layer (520) seals the injection hole (140). A connecting layer (530) is disposed on the injection hole (140), and the adhesive layer (510) is connected to the outer shell (100) through the connecting layer (530). The connecting layer (530) has a first through hole (531) communicating with the injection hole (140).

6. The battery according to claim 5, characterized in that, The connecting layer (530) is an annular piece, and the annular piece has the first through hole (531); The outer diameter of the annular plate is larger than the inner diameter of the injection hole (140); And / or, the ratio of the outer diameter of the annular plate to the inner diameter of the injection hole (140) is greater than or equal to 2 and less than or equal to 3.5; And / or, the ratio of the inner diameter of the first through hole (531) to the inner diameter of the injection hole (140) is greater than or equal to 0.5 and less than or equal to 1.5; And / or, the separation layer (520) is a disc; The ratio of the outer diameter of the disc to the outer diameter of the connecting layer (530) is greater than or equal to 0.5 and less than or equal to 0.

8.

7. The battery according to claim 6, characterized in that, The adhesive layer (510) has a circular ring structure, and the ratio of the outer diameter of the circular ring structure to the outer diameter of the circular piece is greater than or equal to 1 and less than or equal to 1.

1. And / or, the adhesive layer (510) has a second through hole (511) whose inner diameter is greater than or equal to 0.5 and less than or equal to 1 compared with the inner diameter of the first through hole (531).

8. The battery according to claim 1, characterized in that, The thickness of the sealing structure (500) is greater than or equal to 0.08 mm, and in the direction of the cover plate (200) toward the second housing (160), the sealing structure (500) does not protrude from the plane of the surface of the second housing (160) facing away from the cover plate (200).

9. The battery according to claim 1, characterized in that, The first platform (1511) is parallel to the cover plate (200); along the thickness direction of the outer shell (100), the orthographic projection of the sealing structure (500) is located within the first platform (1511).

10. The battery according to claim 1, characterized in that, The battery also includes a negative terminal (600); The negative terminal (600) is disposed on the first platform (1511); The negative electrode post (600) and the sealing structure (500) are spaced apart on the first platform (1511); Furthermore, along the thickness direction of the outer shell (100), the orthogonal projection of the negative electrode post (600) falls within the first platform (1511).

11. The battery according to claim 10, characterized in that, Along the length direction of the first step (151): The distance between the negative electrode post (600) and the sealing structure (500) is greater than or equal to 0.3 mm and less than or equal to 3 mm; The minimum distance from the negative electrode post (600) to the outer edge of the first step (151) is greater than or equal to 0.3 mm and less than or equal to 4 mm; The minimum distance from the sealing structure (500) to the outer edge of the first step (151) is greater than or equal to 0.3 mm and less than or equal to 2 mm; And / or, along the width direction of the first step (151), the difference between the width of the first step (151) and the width of the sealing structure (500) is greater than or equal to 0.9 mm and less than or equal to 6 mm. And / or, the ratio of the distance from the first platform (1511) to the cover plate (200) to the distance from the surface of the second housing (160) facing away from the cover plate (200) to the cover plate (200) is greater than or equal to 0.2 and less than or equal to 0.

5.

12. The battery according to claim 1, characterized in that, The first housing (150) also has a second step (152), and the second step (152) has a second platform (1521); The battery also includes a positive electrode assembly (700) disposed on the second platform (1521); In the thickness direction of the outer shell (100), the second platform (1521) does not protrude from the plane of the surface of the second shell (160) facing away from the cover plate (200).

13. The battery according to claim 12, characterized in that, The ratio of the distance from the second platform (1521) to the cover plate (200) to the distance from the surface of the second housing (160) facing away from the cover plate (200) to the cover plate (200) is greater than or equal to 0.3 and less than or equal to 0.

8.

14. The battery according to claim 12, characterized in that, Along the length direction of the second step (152), the difference between the length of the second step (152) and the length of the positive electrode component (700) is greater than or equal to 0.9 mm and less than or equal to 5 mm.

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