Housing Sealing Structure and Battery

Abstract

This application relates to a housing sealing structure and a battery. The housing sealing structure of this application includes a cover plate, an elastic seal, and a housing body. The elastic seal wraps around the edge portion of the cover plate; the housing body includes a housing bottom plate and a border. One end of the border is connected to the housing bottom plate, and the other end is bent at multiple places to form a fixing groove; wherein, the cover plate is connected to the fixing groove through the elastic seal, and at least one pressure relief through hole is provided on the border and at the position of the fixing groove. Therefore, the fixing groove of this application is formed by bending the housing at the border, so that the bending sections with protrusions and depressions of the housing can form multiple regions with sudden changes in compression ratio with the elastic seal, forming a curved sealing route to make the sealing effect more reliable; furthermore, the setting of the pressure relief through hole in this application enables this application to have an explosion-proof and pressure relief function related to the elastic deformation of the elastic seal, and because the deformation related to the compression ratio of the housing sealing structure in this application is relatively small, the explosion-proof and pressure relief sensitivity of this application is higher.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a housing sealing structure and a battery. Background Art

[0002] At present, as a movable power source, the battery is widely used in various occasions and has become an essential item in people's lives.

[0003] In the prior art, lithium-ion batteries, especially button-type lithium-ion batteries, adopt a combination riveting structure of upper and lower half shells similar to that of primary button batteries, or a combination welding structure of a housing and a cover plate. These structures all have the disadvantages of complex manufacturing processes and relatively high manufacturing costs.

[0004] Furthermore, in the combination riveting structure of the upper and lower half shells in the prior art, radial extrusion riveting is performed in the overlapping area of the upper and lower shells on the side, and the internal support of the battery mainly relies on the thin wall of the internal half shell and the electrode structure for support. Due to the insufficient support strength of this part, the extrusion riveting is not sufficient and prone to rebound, and the compression rate of the seal after riveting is insufficient. As a result, the sealing performance after riveting is unreliable, and it is easy to cause liquid leakage during the subsequent use of the battery.

[0005] In the prior art, some combination riveting structures of upper and lower half shells also have a pressure relief and explosion-proof structure including an exhaust hole. However, the working principle of this pressure relief and explosion-proof structure is that the high-pressure gas inside the battery case needs to push the upper and lower half shells to move relative to each other, and only after the exhaust hole is exposed can pressure relief and explosion protection be achieved. Therefore, a relatively large space for the relative movement of the upper and lower half shells needs to be reserved in this combination riveting structure of the upper and lower half shells.

[0006] In the combination welding structure of a housing and a cover plate in the prior art, the cover plate of this structure generally adopts a structure of riveting or insulating material sealing. Under the current technical conditions, it is difficult to meet the requirements of ensuring insulation, sealing, and sufficient structural strength at the same time, and it is difficult to manufacture a structure with a thickness of less than 1 mm, resulting in a low utilization rate of the internal space of this structure. In addition, this structure requires precise laser welding with the housing and the cover plate in a good matching state, and has high requirements for structural accuracy and manufacturing process requirements, resulting in low production efficiency and high costs.

[0007] In the prior art, it is difficult to precisely control the pressure relief of the explosion-proof and pressure relief structure of the combination welding structure of the housing and the cover plate, and blasting splashes will be formed during the pressure relief process, making it difficult to ensure the safety of external personnel. Summary of the Invention

[0008] The purpose of the present application is to provide a housing sealing structure and a battery, which can optimize the sealing structure of the housing in the battery and reduce the manufacturing cost.

[0009] To achieve the above object,

[0010] In a first aspect, the present invention provides a housing sealing structure, comprising: a cover plate, an elastic seal, and a housing body. The elastic seal is wrapped around the edge portion of the cover plate. The housing body includes a housing bottom plate and a frame. One end of the frame is connected to the housing bottom plate, and the other end is bent at multiple places to form a fixing groove. Wherein, the cover plate is connected to the fixing groove through the elastic seal.

[0011] In one embodiment, the frame includes: a first pipe section, a first bending portion, a second pipe section, a second bending portion, and a third pipe section. One end of the first pipe section is connected to the housing bottom plate, and the other end extends away from the housing bottom plate. One end of the first bending portion is connected to the first pipe section, and the other end extends outward. One end of the second pipe section is connected to the first bending portion, and the other end extends toward the housing bottom plate. One end of the second bending portion is connected to the second pipe section, and the other end extends outward. One end of the third pipe section is connected to the second bending portion, and the other end extends away from the housing bottom plate. Wherein, the length of the third pipe section is greater than the length of the second pipe section, and the first bending portion, the second pipe section, the second bending portion, and the third pipe section form the fixing groove.

[0012] In one embodiment, the frame further includes: a third bending portion. One end of the third bending portion is connected to the third pipe section, and the other end extends inward.

[0013] In one embodiment, the frame further includes: a connecting ring piece, and the connecting ring piece is connected to the third bending portion. Wherein, the elastic seal is connected with an extended elastic ring piece, and the extended elastic ring piece is clamped between the connecting ring piece and the cover plate.

[0014] In one embodiment, the cover plate is provided with a bending protrusion on the side facing away from the housing bottom plate. The connecting ring piece is provided with a bending groove adapted to the bending protrusion. Wherein, when the extended elastic ring piece is clamped between the connecting ring piece and the cover plate, the extended elastic ring piece is squeezed to form a first mating depression adapted to the bending protrusion and a first mating protrusion extending into the bending groove.

[0015] In one embodiment, the surface of the third bending portion is a circular arc-shaped curved surface. The edge portion of the cover plate has a first rounded corner adapted to the third bending portion. Wherein, when the elastic seal abuts against the third bending portion, the elastic seal is squeezed to form a third mating depression adapted to the first rounded corner and a third mating protrusion extending into the third bending portion.

[0016] In one embodiment, the surface of the first bending portion is an arc-shaped curved surface; the size of the gap between the first bending portion and the third pipe section gradually increases in the direction away from the housing bottom plate; wherein, when the elastic seal abuts against the first bending portion, the elastic seal is squeezed to form a second mating recess adapted to the first bending portion and a second mating protrusion extending into the gap.

[0017] In one embodiment, the edge portion of the cover plate includes a first annular body and a second annular body. One end of the first annular body is connected to the second annular body, and the other end extends towards the housing bottom plate; wherein, when the cover plate is connected to the fixed groove through the elastic seal, the first annular body is clamped between the second pipe section and the third pipe section through the elastic seal.

[0018] In one embodiment, at least one pressure relief through hole is provided on the frame and at the fixed groove.

[0019] In a second aspect, the present invention provides a battery, comprising: a housing sealing structure and an electrode, wherein the housing sealing structure is the housing sealing structure according to any one of the foregoing embodiments; and the electrode is disposed inside the housing sealing structure.

[0020] The beneficial effects of the present application compared with the prior art are as follows:

[0021] The present application optimizes the sealing structure of the housing in the battery. The elastic seal can be first wrapped around the edge portion of the cover plate, and then the cover plate wrapped with the elastic seal is installed in the fixed groove to seal the cover plate and the housing body, which simplifies the assembly process and is easy to operate. Moreover, the fixed groove of the present application is formed by bending the housing at the frame, so that the bending section protrusions and depressions of the housing can form multiple compression ratio mutation regions with the elastic seal, forming a curved sealing route to make the sealing effect more reliable.

[0022] In the present application, the frame includes a first pipe section, a first bending portion, a second pipe section, a second bending portion, a third pipe section and a third bending portion, so that a support structure for riveting the housing sealing structure is provided at the bending portion, which is beneficial to the deformation stability of the third pipe section during riveting forming and makes the riveting sealing effect more reliable.

[0023] In addition, at least one pressure relief through hole is provided on the frame and at the fixed groove of the present application, so that the present application has an explosion-proof and pressure relief function related to the elastic deformation (compression ratio) of the elastic seal, which can prevent the explosion caused by excessive internal pressure of the battery; and because the compression ratio-related deformation of the housing sealing structure of the present application is small, the explosion-proof and pressure relief sensitivity of the present application is higher, and only a small deformation space is required to achieve the explosion-proof and pressure relief action. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of a battery shown in an embodiment of the present application.

[0026] Figure 2 It is a schematic internal structural diagram of a battery shown in an embodiment of the present application.

[0027] Figure 3a It is a cross-sectional view of a housing sealing structure shown in an embodiment of the present application.

[0028] Figure 3b Shown in an embodiment of the present application Figure 3a Enlarged view of part A.

[0029] Figure 3c It is an exploded view of a housing sealing structure shown in an embodiment of the present application.

[0030] Figure 4a It is a cross-sectional view of a housing sealing structure shown in an embodiment of the present application.

[0031] Figure 4b Shown in an embodiment of the present application Figure 4a Enlarged view of part B.

[0032] Figure 4c It is an exploded view of a housing sealing structure shown in an embodiment of the present application.

[0033] Figure 5a It is a cross-sectional view of a housing sealing structure shown in an embodiment of the present application.

[0034] Figure 5b Shown in an embodiment of the present application Figure 5a Enlarged view of part C.

[0035] Figure 5c It is an exploded view of a housing sealing structure shown in an embodiment of the present application.

[0036] Figure 6a It is a cross-sectional view of a housing sealing structure shown in an embodiment of the present application.

[0037] Figure 6b Shown in an embodiment of the present application Figure 6a Enlarged view of part D.

[0038] Figure 6cExplosion schematic diagram of the housing sealing structure shown in an embodiment of the present application.

[0039] Icons: 1 - battery; 12 - battery material; 13 - housing sealing structure; 200 - cover plate; 200a - outer surface of the cover plate; 200b - inner surface of the cover plate; 200c - side surface of the cover plate; 210 - edge part of the cover plate; 211 - first annular body; 212 - second annular body; 220 - middle part of the cover plate; 230 - bending protrusion; 240 - first rounded corner; 300 - elastic seal; 310 - first seal; 320 - second seal; 330 - third seal; 340 - extended elastic ring piece; 350 - first flanging; 360 - second flanging; 301 - first mating depression; 302 - first mating protrusion; 303 - second mating depression; 304 - second mating protrusion; 305 - third mating depression; 306 - third mating protrusion; 400 - housing body; 410 - housing bottom plate; 420 - frame; 430 - accommodation cavity; 440 - bending groove; 450 - fixing groove; 460 - pressure relief through hole; 480 - gap; 401 - first pipe section; 402 - first bending part; 403 - second pipe section; 404 - second bending part; 405 - third pipe section; 406 - third bending part; 407 - connecting ring piece. Detailed implementation manners

[0040] The terms "first", "second", "third", etc. are only used for distinguishing descriptions, do not represent the serial number of arrangement, and cannot be understood as indicating or implying relative importance.

[0041] In addition, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "left", "right", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0043] In the description of the present application, unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components.

[0044] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0045] Please refer to Figure 1 , which is a schematic structural diagram of the battery 1 shown in an embodiment of the present application. A battery 1 includes: a housing sealing structure 13 and battery materials 12 arranged inside the housing sealing structure 13 (please refer to Figure 2 ). The housing sealing structure 13 includes a cover plate 200 and a housing body 400 that cooperate with each other. The battery 1 may be a lithium-ion battery or other batteries such as a silver oxide battery.

[0046] In this embodiment, the housing sealing structure 13 has a relatively large diameter and a relatively thin thickness, and may be a button-type battery case with an outer dimension like a small button. In another embodiment, the housing sealing structure 13 may also be a cylindrical battery case, a square battery case, or a special-shaped battery case. In addition to being applied to the battery 1, the housing sealing structure 13 can also be used for the sealing parts of other devices.

[0047] Please refer to Figure 2 , which is a schematic internal structure diagram of the battery 1 shown in an embodiment of the present application. The battery materials 12 include electrodes, electrolytes, etc. The battery materials 12 such as electrodes and electrolytes are arranged in the housing sealing structure 13. The housing sealing structure 13 includes: a cover plate 200, an elastic seal 300, and a housing body 400. The elastic seal 300 wraps around the edge portion 210 of the cover plate; the housing body 400 has a receiving cavity 430, one end is open, and the other end is closed. The housing body 400 is bent at multiple places at the open end to form a fixing groove 450 for riveting and forming. The cover plate 200 is connected to the fixing groove 450 through the elastic seal 300.

[0048] During an operation process, the shell body 400 is connected to one electrode tab, and the cover plate 200 is connected to the other electrode tab; the battery materials 12 such as electrodes and electrolytes are placed into the accommodation cavity 430 of the shell body 400; the elastic seal 300 can be first wrapped around the edge portion 210 of the cover plate, and then the cover plate 200 wrapped with the elastic seal 300 is installed into the fixed groove 450 to seal the cover plate 200 and the shell body 400. Among them, in this embodiment, the cover plate 200, the elastic seal 300 and the shell body 400 can be first manufactured and formed, and then assembled. Therefore, the sealing structure of the shell in the battery 1 is optimized in this embodiment, the assembly process is simplified, and it is easy to operate. Moreover, the manufacturing cost is reduced and the assembly process is simplified. Furthermore, the fixed groove in this embodiment is formed by bending the shell at the border, so that the bending section protrusions and depressions of the shell can form multiple compression ratio mutation regions with the elastic seal, forming a curved sealing route to make the sealing effect more reliable.

[0049] Among them, the operation of sealing the cover plate 200 and the shell body 400 can be riveting or pressing, etc. In this embodiment, the operation of sealing the cover plate 200 and the shell body 400 is riveting. First, the cover plate 200 is pressed, and then a riveting forming operation is performed at the fixed groove 450 of the shell body 400. In this embodiment, at least one independent region of the elastic seal 300 disposed between the shell body 400 and the cover plate 200 is extruded by the riveting deformation of the shell body 400 and maintained, so that the elastic seal 300 has a gas or liquid sealing function under certain compression conditions (compression ratio). Since the elastic seal 300 is made of an insulating material, the elastic seal 300 also plays an insulating role in separating and maintaining the positive and negative electrode components of the battery 1.

[0050] The material of the shell body 400 can be metal, such as: iron alloys such as stainless steel, carbon steel, or aluminum alloy. The shell body 400 can be manufactured by cold processing forming methods such as stamping, extrusion, bending, or can be manufactured by powder metallurgy forming methods, etc.

[0051] The elastic seal 300 has a sealing and insulating function. The material of the elastic seal 300 is a plastic with elasticity and insulation properties, such as: PFA (Perfluoroalkoxy, a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), PP (Polypropylene), PE (polyethylene), etc. materials with elasticity and chemical corrosion and aging resistance. The elastic seal 300 can be manufactured by manufacturing methods and processes such as extrusion and injection molding. In this embodiment, the elastic seal 300 is manufactured by an injection molding process.

[0052] The cover plate 200 is made of metal, such as: iron alloys like stainless steel, carbon steel, or aluminum alloy. The cover plate 200 can be manufactured by cold working forming methods such as stamping, extrusion, bending, or by methods such as powder metallurgy forming.

[0053] Please refer to Figure 3a , which is a cross-sectional view of the housing sealing structure 13 shown in an embodiment of the present application. Please refer to Figure 3b , which is shown in an embodiment of the present application Figure 3a Enlarged view of part A. Please refer to Figure 3c , which is an exploded schematic view of the housing sealing structure 13 shown in an embodiment of the present application. The housing body 400 includes a housing bottom plate 410 and a frame 420. One end of the frame 420 is connected to the housing bottom plate 410, and the other end is bent at multiple places to form a fixing groove 450. Among them, the housing bottom plate 410 and the frame 420 can be integrally formed or fixedly connected together by means such as welding and riveting. The axis of the housing bottom plate 410 and the axis of the frame 420 can coincide or not coincide.

[0054] The direction in which the fixing groove 450 points to the housing bottom plate 410 is defined as downward, the direction pointing to the accommodation cavity 430 is defined as inward, and the direction away from the accommodation cavity 430 is defined as outward.

[0055] The frame 420 includes a first pipe section 401, a first bending part 402, a second pipe section 403, a second bending part 404, a third pipe section 405, and a third bending part 406 that are connected in sequence from bottom to top.

[0056] One end of the first pipe section 401 is connected to the housing bottom plate 410, and the other end extends in the direction away from the housing bottom plate 410 (upward); one end of the first bending part 402 is connected to the first pipe section 401, and the other end extends outward; one end of the second pipe section 403 is connected to the first bending part 402, and the other end extends in the direction close to the housing bottom plate 410 (downward); one end of the second bending part 404 is connected to the second pipe section 403, and the other end extends outward; one end of the third pipe section 405 is connected to the second bending part 404, and the other end extends in the direction away from the housing bottom plate 410 (upward); one end of the third bending part 406 is connected to the third pipe section 405, and the other end extends inward.

[0057] The length of the third pipe section 405 is greater than the length of the second pipe section 403, the inner diameter of the third pipe section 405 is greater than the outer diameter of the second pipe section 403, the inner diameter of the second pipe section 403 is greater than the outer diameter of the first pipe section 401, and the first bending part 402, the second pipe section 403, the second bending part 404, the third pipe section 405, and the third bending section form the fixing groove 450.

[0058] The edge portion 210 of the cover plate is in a straight plate shape. The elastic seal 300 includes a first seal 310, a second seal 320, and a third seal 330 that are integrally formed and connected in sequence. The first seal 310 contacts the inner surface 200b of the cover plate, the second seal 320 contacts the side surface 200c of the cover plate, and the third seal 330 contacts the outer surface 200a of the cover plate.

[0059] During an operation process, when the cover plate 200 wrapped with the elastic seal 300 is inserted into the fixed groove 450 and riveted and sealed, the first seal 310 abuts against the first bending portion 402 to form a first sealing area, and the second seal 320 abuts against the inner surface of the third pipe section 405 to form a second sealing area. These two sealing areas can form a secondary seal for the accommodation cavity 430, fully ensuring the reliability of the seal. Furthermore, since the third bending portion 406 is provided in this embodiment, the third seal 330 abuts against the third bending portion 406, thereby restricting the outward movement of the cover plate 200 and improving the sealing effect. Since the edge portion 210 of the cover plate in this embodiment is in a straight plate shape, the gap left between the second pipe section 403 and the third pipe section 405 is not filled, and this gap can be used as a gas storage space.

[0060] Among them, when the cover plate 200 is pressed and the riveting structure is adjusted, the elastic seal 300 is compressed, and the sealing performance of the entire housing sealing structure 13 can be controlled by adjusting the compression degree (compression ratio) of the elastic seal 300.

[0061] The first pipe section 401, the first bending portion 402, the second pipe section 403, the second bending portion 404, the third pipe section 405, and the third bending portion 406 can be integrally formed or fixedly connected together by means such as welding and riveting. The first pipe section 401, the first bending portion 402, the second pipe section 403, the second bending portion 404, the third pipe section 405, the third bending portion 406, and the housing bottom plate 410 can be coaxially arranged or non-coaxially arranged.

[0062] In this embodiment, the first pipe section 401, the first bending portion 402, the second pipe section 403, the second bending portion 404, the third pipe section 405, the third bending portion 406, and the housing bottom plate 410 are integrally formed and coaxially arranged. The first pipe section 401, the second pipe section 403, and the third pipe section 405 are hollow cylindrical. The first bending portion 402, the second bending portion 404, and the third bending portion 406 can be curved circular ring pieces. In this embodiment, the frame 420 includes the first pipe section 401, the first bending portion 402, the second pipe section 403, the second bending portion 404, the third pipe section 405, and the third bending portion 406, thereby providing a support structure for the housing sealing structure 13 during riveting at the bending position, which is beneficial to the deformation stability of the third pipe section during riveting forming and makes the riveting and sealing effect more reliable.

[0063] There is at least one pressure relief through hole 460 on the frame 420 and at the fixed groove 450. In this embodiment, a plurality of pressure relief through holes 460 are arranged circumferentially on the third pipe section 405 and are isolated from the accommodation cavity 430 by a first sealing area formed by the first seal 310 abutting against the first bending part 402.

[0064] During an operation, when the internal air pressure in the accommodation cavity 430 of the battery 1 rises, the cover plate 200 is pushed by an outward pressure, and the housing sealing structure 13 will turn outwards and deform, and the degree of deformation is positively correlated with the magnitude of the internal air pressure. At this time, the compression rate of the first seal 310 in the first sealing area will decrease, and the degree of decrease is positively correlated with the magnitude of the internal pressure. When the first seal 310 in the first sealing area decreases below the sealing threshold, the sealing of the housing sealing structure 13 begins to fail, and a small amount of gas is discharged through the pressure relief through hole 460 from the gap between the first seal 310 and the first bending part 402; when the internal air pressure continues to increase, the sealing completely fails, and a large amount of gas is discharged through the pressure relief through hole 460 from the gap between the first seal 310 and the first bending part 402. Since the gas is discharged, it is possible to prevent the battery 1 from exploding due to excessive internal air pressure, and because the compression rate-related deformation in the housing sealing structure 13 of this embodiment is small, the explosion-proof and pressure relief sensitivity of this embodiment is higher, and only a small deformation space is required to achieve the explosion-proof and pressure relief action.

[0065] Among them, to facilitate gas flow, the height of the pressure relief through hole 460 is equal to or higher than the height of the contact surface between the second seal 320 and the first bending part 402.

[0066] To facilitate gas flow, a second fillet is provided at the outer surface connection of the first seal 310 and the second seal 320; to improve the sealing effect, third fillets matching the third bending part 406 are provided at the connections of the second seal 320 and the third seal 330.

[0067] In this embodiment, the cover plate 200 is a bent plate member, the edge part 210 of the cover plate is in a straight plate shape, the middle part 220 of the cover plate is a convex platform, the convex platform is in a hollow frustum shape, and the elastic seal 300 further includes a first flanging 350 connected to the third seal 330. The first flanging 350 is clamped between the third bending part 406 of the frame and the cover plate 200 and is used to contact the edge of the third bending part 406, the side surface of the convex platform, and the turning part between the middle part 220 and the edge part 210 of the cover plate. Therefore, the setting of the first flanging 350 and the middle part 220 of the cover plate can improve the sealing effect. Among them, the first flanging 350, the first seal 310, the second seal 320, and the third seal 330 can be integrally formed.

[0068] Please refer toFigure 4a , which is a cross-sectional view of the housing sealing structure 13 shown in an embodiment of the present application. Please refer to Figure 4b , which is shown in an embodiment of the present application Figure 4a Enlarged view of part B. Please refer to Figure 4c , which is an exploded schematic view of the housing sealing structure 13 shown in an embodiment of the present application. The longitudinal section of the edge part 210 of the cover plate is in an "L" shape, including a first annular body 211 and a second annular body 212. One end of the first annular body 211 is connected to the second annular body 212, and the other end extends towards the housing bottom plate 410 (downwards). The first annular body 211 and the second annular body 212 can be integrally formed or fixedly connected by welding or other means. In this embodiment, the first annular body 211 is in the shape of a circular tube, and the second annular body 212 is in the shape of a circular ring plate.

[0069] When the cover plate 200 is connected to the fixed groove 450 through the elastic seal 300, the first annular body 211 is clamped between the second pipe section 403 and the third pipe section 405 through the elastic seal 300. With such a setting, the riveting seal path in this embodiment is longer, the sealing effect is good, the reliability is high, and the wall thickness of the housing body 400 can be designed thinner, the height can be designed lower, and the size of the battery 1 can tend to be more miniaturized.

[0070] Please refer to Figure 5a , which is a cross-sectional view of the housing sealing structure 13 shown in an embodiment of the present application. Please refer to Figure 5b , which is shown in an embodiment of the present application Figure 5a Enlarged view of part C. Please refer to Figure 5c , which is an exploded schematic view of the housing sealing structure 13 shown in an embodiment of the present application. The cover plate 200 is a straight plate member, the edge part 210 of the cover plate is in a straight plate shape, the middle part 220 of the cover plate is in a straight plate shape, and the edge part 210 of the cover plate and the middle part 220 of the cover plate are at the same horizontal height.

[0071] The frame 420 further includes: a connecting ring plate 407, and the connecting ring plate 407 is connected to the third bending part 406; wherein, the elastic seal 300 is connected with an extended elastic ring plate 340, and the extended elastic ring plate 340 is clamped between the connecting ring plate 407 and the cover plate 200. With such a setting, the riveting seal path in this embodiment is longer, the sealing effect is good, the reliability is high, and the wall thickness of the housing body 400 can be designed thinner, the height can be designed lower, and the size of the battery 1 can tend to be more miniaturized.

[0072] The surface of the third bending part 406 is a circular arc curved surface; the edge part 210 of the cover plate has a first rounded corner 240 adapted to the third bending part 406. The first rounded corner 240 is provided at the junction of the outer surface 200a of the cover plate and the side surface 200c of the cover plate.

[0073] When the elastic seal 300 abuts against the third bent portion 406, the elastic seal 300 is extruded to form a third mating recess 305 adapted to the first rounded corner 240 and a third mating protrusion 306 extending into the third bent portion 406. With such a setting, in this embodiment, a relatively large local extrusion can be generated at the third mating recess 305 and the third mating protrusion 306, and the third mating recess 305 and the third mating protrusion 306 can be used as key riveting points.

[0074] The surface of the first bent portion 402 is an arc-shaped curved surface; the size of the gap 480 between the first bent portion 402 and the third pipe section 405 increases successively in the direction away from the housing bottom plate 410, forming a gap structure similar to a trumpet shape.

[0075] When the elastic seal 300 abuts against the first bent portion 402, the elastic seal 300 is extruded to form a second mating recess 303 adapted to the first bent portion 402 and a second mating protrusion 304 extending into the gap 480 between the first bent portion 402 and the third pipe section 405. With such a setting, in this embodiment, riveting extrusion can be performed at the second mating recess 303 and the second mating protrusion 304, and the second mating recess 303 and the second mating protrusion 304 can be used as key sealing points. Among them, in this embodiment, the gap 480 between the first bent portion 402 and the third pipe section 405 is a trumpet-shaped structure, which is conducive to the formation of the second mating protrusion 304 to generate a gradually enhanced sealing effect.

[0076] Among them, the second mating protrusion 304, the second mating recess 303, the third mating recess 305 and the third mating protrusion 306 can be formed during the molding process of the elastic seal 300 or can be formed by extrusion after the assembly of the housing sealing structure 13.

[0077] In this embodiment, the cover plate 200 is a straight plate member, and the elastic seal 300 further includes a second flanging 360 connected to the extended elastic ring piece 340. The second flanging 360 contacts the edge of the third bent portion 406 to improve the sealing effect. Among them, the second flanging 360, the extended elastic ring piece 340, the first seal 310, the second seal 320 and the third seal 330 can be integrally formed.

[0078] Please refer to Figure 6a , which is a cross-sectional view of the housing sealing structure 13 shown in an embodiment of the present application. Please refer to Figure 6b , which is shown in an embodiment of the present application Figure 6a The enlarged view of part D. Please refer to Figure 6c, which is an exploded view of the housing sealing structure 13 shown in an embodiment of the present application. The cover plate 200 is provided with a bending protrusion 230 on the side facing away from the housing bottom plate 410; the bending protrusion 230 can be an additive convex structure formed by integral molding or a non-additive convex structure formed by bending. In this embodiment, the cover plate 200 is a bent plate member, the edge portion 210 of the cover plate is in a straight plate shape, the middle portion 220 of the cover plate is in a straight plate shape, and the edge portion 210 of the cover plate and the middle portion of the cover plate 200 are relatively inclined to form the bending protrusion 230.

[0079] The connecting ring piece 407 is provided with a bending groove 440 adapted to the bending protrusion 230, and the curvature of the bending groove 440 is greater than the curvature of the bending protrusion 230.

[0080] When the extending elastic ring piece 340 is clamped between the connecting ring piece 407 and the cover plate 200, the extending elastic ring piece 340 is extruded to form a first fitting depression 301 adapted to the bending protrusion 230 and a first fitting protrusion 302 extending into the bending groove 440. With such a setting, in this embodiment, a relatively large local extrusion can be generated at the first fitting depression 301 and the first fitting protrusion 302, and the first fitting depression 301 and the first fitting protrusion 302 can be used as key riveting points.

[0081] Among them, the first fitting depression 301 and the first fitting protrusion 302 can be formed during the molding process of the elastic seal 300 or can be formed by extrusion after the assembly of the housing sealing structure 13.

[0082] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0083] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A housing sealing structure, characterized in that, Comprising: A cover plate; An elastic seal, wrapped around the edge part of the cover plate; And A shell body, including a shell bottom plate and a frame. One end of the frame is connected to the shell bottom plate, and the other end is bent at multiple places to form a fixing groove; The frame includes a first pipe section, a first bending part, a second pipe section, a second bending part and a third pipe section; One end of the first pipe section is connected to the shell bottom plate, and the other end extends away from the shell bottom plate; One end of the first bending part is connected to the first pipe section, and the other end extends outwards; One end of the second pipe section is connected to the first bending part, and the other end extends towards the shell bottom plate; One end of the second bending part is connected to the second pipe section, and the other end extends outwards; One end of the third pipe section is connected to the second bending part, and the other end extends away from the shell bottom plate; Wherein, the length of the third pipe section is greater than the length of the second pipe section, and the first bending part, the second pipe section, the second bending part and the third pipe section form the fixing groove; The surface of the first bending part is an arc-shaped curved surface; The gap size between the first bending part and the third pipe section increases sequentially along the direction away from the shell bottom plate; Wherein, when the elastic seal abuts against the first bending part, the elastic seal is extruded to form a second fitting depression adapted to the first bending part, and a second fitting protrusion extending into the gap; Wherein, the cover plate is connected to the fixing groove through the elastic seal; At least one pressure relief through hole is provided on the frame and at the fixing groove, and a plurality of the pressure relief through holes are arranged on the third pipe section along the circumferential direction.

2. The housing sealing structure according to claim 1, characterized in that, The frame further includes: A third bending part, one end of which is connected to the third pipe section, and the other end extends inwards.

3. The housing sealing structure according to claim 2, wherein, The frame further includes: A connecting ring piece, connected to the third bending part; Wherein, the elastic seal is connected with an extended elastic ring piece, and the extended elastic ring piece is clamped between the connecting ring piece and the cover plate.

4. The housing sealing structure according to claim 3, characterized in that, The cover plate is provided with a bending protrusion on the surface facing away from the shell bottom plate; The connecting ring piece is provided with a bending groove adapted to the bending protrusion; Wherein, when the extended elastic ring piece is clamped between the connecting ring piece and the cover plate, the extended elastic ring piece is extruded to form a first fitting depression adapted to the bending protrusion, and a first fitting protrusion extending into the bending groove.

5. The housing sealing structure according to claim 3, characterized in that, The surface of the third bending part is an arc-shaped curved surface; The edge part of the cover plate has a first rounded corner adapted to the third bending part; Wherein, when the elastic seal abuts against the third bending part, the elastic seal is extruded to form a third fitting depression adapted to the first rounded corner, and a third fitting protrusion extending into the third bending part.

6. The housing sealing structure according to claim 1, wherein The edge part of the cover plate includes a first annular body and a second annular body. One end of the first annular body is connected to the second annular body, and the other end extends towards the shell bottom plate; Wherein, when the cover plate is connected to the fixing groove through the elastic seal, the first annular body is clamped between the second pipe section and the third pipe section through the elastic seal.

7. A battery, characterized in that, Comprising: A housing sealing structure, being the housing sealing structure according to any one of claims 1 to 6; and an electrode, disposed within the housing sealing structure.

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