Shell assembly of battery, battery and electric device

Abstract

The utility model discloses a shell assembly of a battery, the battery and an electric device, and relates to the field of new energy batteries. The shell assembly of the battery comprises a first cover plate and a first collector plate, wherein the first cover plate comprises a main body plate part and a first convex part connected with the main body plate part; the first collector plate is arranged on one side, facing the battery cell, of the first cover plate; wherein the first protruding part protrudes towards the battery cell relative to the main body plate part, the surface, facing the battery cell, of the first protruding part is a first welding area, and the partial surface, facing the first cover plate, of the first collector plate is a second welding area; the surfaces where the second welding area and the first welding area are located are smooth surfaces, and the second welding area and the first welding area are in surface contact and welded connection. According to the shell assembly disclosed by the embodiment of the utility model, the welding reliability between the first current collecting cover and the first cover body, the current conduction efficiency and the overall structure stability are improved, so that the battery performance is improved, and meanwhile, the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery field, specifically relates to a battery's casing assembly and battery. BACKGROUND

[0002] In new energy battery manufacturing, the connection quality of the current collecting disc and the cover plate has an important influence on the performance and safety of the battery. Some existing connection methods achieve fixation by setting a protruding part protruding from the cover body at the welding position, but such a structure has certain defects, for example, it increases the complexity of the manufacturing process, easily causes stress concentration, and affects the stability of current conduction, thereby reducing the performance and service life of the battery.

[0003] Therefore, the connection method of the current collecting disc and the cover body has certain room for improvement. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model proposes a casing assembly of a battery, which improves the welding reliability, current conduction efficiency, and overall structural stability between the first current collecting cover and the first cover body, thereby improving the performance of the battery, and prolonging the service life of the battery.

[0005] The utility model proposes a battery.

[0006] The utility model proposes an electric device.

[0007] The casing assembly of the battery according to the first aspect of the utility model comprises a first cover plate and a first current collecting disc, the first cover plate comprises a main plate part and a first protruding part connected thereto; the first current collecting disc is arranged on the side of the first cover plate facing the battery cell; wherein the first protruding part is arranged protruding towards the battery cell relative to the main plate part, the surface of the first protruding part facing the battery cell is a first welding area, and the part surface of the first current collecting disc facing the first cover plate is a second welding area; the faces where the second welding area and the first welding area are located are both smooth faces, and the second welding area and the first welding area are in surface contact and welded connection.

[0008] The casing assembly according to the utility model embodiment achieves smooth surface contact and welded connection between the first protruding part and the first current collecting disc, avoids the stress concentration problem caused by the traditional concave-convex matching method, makes the stress on the welded connection position more uniform, enhances the overall structural stability, and improves the performance and reliability of the battery structure. At the same time, the smooth surface contact increases the effective welding area, reduces the contact resistance, improves the current conduction efficiency, and ensures more stable and reliable current transmission.

[0009] According to the shell assembly of some embodiments of the present application, the second welding area and the first welding area are both planar.

[0010] According to the shell assembly of some embodiments of the present application, the first current collecting disc further comprises: a disc body, a part of the surface of the disc body facing the first cover plate is the second welding area; a second protruding part, the second protruding part is connected with the disc body and protrudes towards the battery cell relative to the disc body, the surface of the second protruding part facing the battery cell is a third welding area, and the third welding area is used for welding connection with the tab of the battery cell.

[0011] In some optional embodiments, the second protruding part is at least two, and is arranged at intervals around the first protruding part.

[0012] Optionally, the center of the first protruding part is located at the center of the first cover plate, and the at least two second protruding parts are arranged in a central symmetry relative to the center of the first cover plate.

[0013] According to the shell assembly of some embodiments of the present application, at least one liquid permeable hole is arranged on the first current collecting disc.

[0014] According to the shell assembly of some embodiments of the present application, a liquid injection hole is formed on the first cover plate, and the liquid injection hole is arranged through in the thickness direction of the first cover plate.

[0015] In some optional embodiments, a through hole is formed on the first current collecting disc, and the through hole is arranged opposite to the liquid injection hole.

[0016] Specifically, in the direction facing the battery cell, the liquid injection hole comprises a main hole section, a flow guide hole section and a connecting hole section connected in sequence, and the flow area of the main hole section, the flow guide hole section and the connecting hole section decreases in sequence.

[0017] More specifically, in the direction from the main hole section to the connecting hole section, the aperture of the flow guide hole section gradually decreases.

[0018] According to the shell assembly of some embodiments of the present application, further comprising: a second cover plate, the second cover plate is arranged at opposite ends of the shell assembly with the first cover plate, and the second cover plate is provided with an assembly hole; a second current collecting disc, the second current collecting disc is arranged on the side of the second cover plate facing the battery cell; a pole, the pole is arranged through the assembly hole and is insulated between the second cover plate, and the pole is connected with the second current collecting disc for conduction.

[0019] In some optional embodiments, further comprising: a first insulating part, the first insulating part is located on the side of the second cover plate away from the battery cell, and a part of the first insulating part is located between the second cover plate and the pole.

[0020] In some optional embodiments, a second insulating member is arranged between the second cover plate and the second current collector plate, and a portion of the second insulating member is located between the second cover plate and the pole.

[0021] In some optional embodiments, a distance between an outer circumferential surface of the pole and an inner circumferential surface of the assembly hole is 2-10 mm.

[0022] According to the shell assembly of some embodiments of the present application, a first air release valve is arranged on the first cover plate.

[0023] In some optional embodiments, the first cover plate further comprises a first buffer protrusion connected to the main plate portion, the first buffer protrusion is arranged adjacent to the first air release valve, and the first buffer protrusion is arranged protruding towards the battery cell relative to the main plate portion to support the first current collector plate when pressure relief.

[0024] Optionally, a second air release valve is arranged on the second cover plate.

[0025] According to some specific embodiments of the present application, a second buffer protrusion protruding towards the battery cell is arranged on the second cover plate, and the second buffer protrusion is arranged adjacent to the second air release valve to support the second current collector plate when pressure relief.

[0026] Optionally, an outer cylinder is connected to the first cover plate and the second cover plate at both ends.

[0027] The outer cylinder and the first cover plate and the second cover plate are independent parts, or one of the outer cylinder, the first cover plate and the second cover plate is an integral part.

[0028] According to the battery of the second aspect of the present application, the shell assembly comprises a receiving cavity, and the battery cell is arranged in the receiving cavity.

[0029] According to the power consuming device of the third aspect of the present application, the battery is the battery of the second aspect of the present application.

[0030] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0032] Figure 1 It is a sectional view of the shell assembly in some embodiments of the present utility model;

[0033] Figure 2 It is a position schematic view of the first cover plate and the first current collecting disc in some embodiments of the present utility model;

[0034] Figure 3 It is a structure schematic view of the first current collecting disc in some embodiments of the present utility model;

[0035] Figure 4 It is a structure schematic view of the liquid injection hole in some embodiments of the present utility model;

[0036] Figure 5 It is a position schematic view of the second cover plate, the first insulating piece and the second insulating piece in some embodiments of the present utility model.

[0037] Reference signs:

[0038] The shell assembly 100,

[0039] The first cover plate 10, the main plate part 11, the first protruding part 13, the first welding area 131, the first buffer protrusion 15, the liquid injection hole 16, the main hole section 161, the flow guide hole section 162, the connecting hole section 163, the flange part 18,

[0040] The first current collecting disc 20, the disc body 22, the second welding area 221, the second protruding part 24, the liquid permeation hole 201, the through hole 202,

[0041] The second cover plate 40, the assembly hole 41,

[0042] The pole 60, the first insulating piece 71, the second insulating piece 72, the first air release valve 73. DETAILED DESCRIPTION

[0043] The embodiments of the present utility model will be described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present utility model, and cannot be understood as the limitation of the present utility model.

[0044] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "thickness", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation to be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0045] In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] It needs to be explained that, in the description of the present application, the meaning of "and / or" is that it includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme

[0047] The following refers to Figures 1-5 The shell assembly 100 of the battery according to the first aspect of the utility model is described.

[0048] As Figure 1 And Figure 2 The shell assembly 100 of the battery according to the embodiment of the utility model comprises: a first cover plate 10 and a first current collector 20.

[0049] Here, the first cover plate 10 is used to seal the battery shell and provide an external electrical connection interface at the same time, ensuring the stability and safety of the internal environment of the battery. The first current collector 20 is responsible for efficiently conducting the current generated by the battery internal core to the external circuit, realizing the input and output of electric energy, and both of them guarantee the normal work and performance stability of the battery.

[0050] Combined with Figure 1 And Figure 2The first cover plate 10 includes a main plate part 11 and a first protruding part 13 connected thereto. The first current collector plate 20 is arranged on the side of the first cover plate 10 facing the battery cell. The first protruding part 13 protrudes towards the battery cell relative to the main plate part 11, and the surface of the first protruding part 13 facing the battery cell is a first welding area 131. The part of the surface of the first current collector plate 20 facing the first cover plate 10 is a second welding area 221.

[0051] The surface of the first protruding part 13 facing the battery cell is the first welding area 131, which is specially used for welding connection with the first current collector plate 20. The first current collector plate 20 is arranged on the side of the first cover plate 10 facing the battery cell, and the part of the surface of the first current collector plate 20 facing the first cover plate 10 is defined as the second welding area 221. Through the cooperation of the first welding area 131 and the second welding area 221, efficient and reliable connection between the first cover plate 10 and the first current collector plate 20 is achieved, and the stability of current transmission is ensured.

[0052] In some optional embodiments, the shape of the first protruding part 13 is designed as Figure 2 a circle as shown, or the first protruding part 13 is designed as a square, or the shape of the first protruding part 13 is designed as a triangle, a rectangle, and other polygons and irregular shapes. Using the first protruding part 13 with the above shapes as the first welding area 131 can make full use of the shape of the first protruding part 13, help to adapt to the needs of different internal space layouts of the battery, and to some extent, disperse the welding stress and improve the durability of the structure.

[0053] The second welding area 221 and the first welding area 131 are both smooth surfaces, and the second welding area 221 and the first welding area 131 are in surface contact and welded connection.

[0054] Through the smooth surface contact and welded connection between the second welding area 221 and the first welding area 131, the performance and reliability of the battery structure are improved.

[0055] Optionally, the surface in contact between the second welding area 221 and the first welding area 131 can be a flat surface or a curved surface. The design of the smooth surface ensures the uniformity and stability of the welding area, reduces stress concentration, and thus improves the welding quality and connection strength.

[0056] Specifically, in some technical solutions, when the second welding area 221 and the first welding area 131 are flat surfaces, the contact surfaces are easy to align, and the operation is simple.

[0057] In some technical solutions, when the second welding area 221 and the first welding area 131 are curved surfaces, it is helpful to improve the deformation resistance of the welding seam and is suitable for use in complex stress environments.

[0058] No matter flat or curved, the surface contact between the two areas can be ensured to be closely fitted, so as to realize good fusion connection and mechanical strength. In addition, the smooth surface can also reduce the probability of defects such as pores and cracks during welding, improve the durability and reliability of the overall structure, and further improve the service life of the battery.

[0059] The welding area of the first protruding part 13 and the first current collector plate 20 adopts a smooth surface structure, which avoids the stress concentration problem caused by the traditional concave-convex matching mode, so that the connection part after welding is more uniform in stress, and the overall structural stability is enhanced.

[0060] At the same time, the smooth surface contact increases the effective welding area, reduces the contact resistance, improves the current conduction efficiency, and ensures that the current transmission is more stable and reliable. In addition, this design simplifies the manufacturing process, reduces the requirement for high-precision machining and assembly, reduces the production cost, and is also convenient for quality detection, further reducing the probability of potential defects. By optimizing the connection structure, the shell assembly 100 not only improves the performance of the battery, but also prolongs the service life.

[0061] According to some optional shell assemblies 100 of the utility model, Figure 1 and Figure 2 The second welding area 221 and the first welding area 131 are both flat.

[0062] This flat structure can ensure that the second welding area 221 and the first welding area 131 can realize maximum surface contact during welding, thereby improving the stability and conductivity of welding. At the same time, the flat structure can simplify the machining process to a certain extent, reduce the manufacturing difficulty, effectively avoid welding defects caused by irregular surfaces, and improve the overall reliability and consistency of the battery connection structure.

[0063] In some optional embodiments, Figures 1-3 The first current collector plate 20 further comprises: a disc body 22 and a second protruding part 24, and the surface of the disc body 22 facing the first cover plate 10 is a second welding area 221. The second protruding part 24 is connected with the disc body 22 and protrudes towards the battery cell relative to the disc body 22, and the surface of the second protruding part 24 facing the battery cell is a third welding area, which is used for welding connection with the tab of the battery cell.

[0064] In the above technical solution, the first current collector plate 20 further comprises a second protruding part 24, which is connected with the disc body 22 and protrudes towards the battery cell relative to the disc body 22. Here, the second protruding part 24 is used to enhance the connection performance between the first current collector plate 20 and the battery cell, and the surface thereof facing the battery cell is structured as a third welding area.

[0065] The third welding area is used for welding connection with the tab of the battery cell. By setting the second protruding part 24 in a protruding form towards the battery cell, the effective contact area during welding can be increased, and stress concentration can be dispersed, thereby improving the stability and durability of the connection structure.

[0066] Here, the second welding area 221 and the third welding area are respectively located on both sides of the first current collector 20, so that the first current collector 20 can simultaneously meet the connection requirements of the first cover plate 10 and the tab of the battery cell, and at the same time, avoid the stress concentration problem that may be caused by unilateral welding, and enhance the conduction ability of the current from the battery cell to the external circuit.

[0067] In addition, the structure of such bilateral welding can also effectively utilize the limited space inside the battery, which is helpful for arranging larger battery cells, thereby improving the endurance of the battery.

[0068] In some specific embodiments, as shown in Figure 3 The second protruding part 24 is at least two, and is arranged around the first protruding part 13.

[0069] By arranging a plurality of second protruding parts 24 around the first protruding part 13, the stress on the connection part after welding can be more uniform, the local stress concentration can be reduced, and the stability and reliability of the entire battery structure are enhanced.

[0070] In some optional embodiments, the second protruding part 24 is a plurality of second protruding parts 24, and the plurality of second protruding parts 24 are arranged in a central symmetric layout with the first protruding part 13 as the center. In this way, the thermal stress and mechanical stress generated during welding can be effectively dispersed, and local overload can be avoided to cause structural deformation or connection failure. In addition, such arrangement also improves the uniformity of current transmission to a certain extent, reduces the contact resistance, and thus improves the overall performance of the battery.

[0071] Optionally, the second protruding part 24 can adopt a strip shape, or adopt a regular or irregular shape such as a circular shape or a rectangular shape.

[0072] More specifically, the center of the first protruding part 13 is located at the center of the first cover plate 10, and the at least two second protruding parts 24 are arranged in a central symmetric manner relative to the center of the first cover plate 10.

[0073] The above layout helps to form a balanced structure on the first current collector 20, and also helps to achieve uniform distribution of stress in function. When external force or thermal stress generated during the welding process acts on the first current collector 20, the central symmetric structure can disperse the stress to the plurality of second protruding parts 24, thereby avoiding deformation or connection failure caused by local stress concentration.

[0074] In addition, since the second protruding portions 24 are uniformly distributed around the center of the first cover plate 10, the current can be efficiently transmitted to the electrode tabs of the battery cell from multiple directions, thereby reducing the contact resistance and improving the conductivity.

[0075] In some embodiments as Figure 3 In some embodiments as

[0076] Optionally, the second protruding portions 24 can be in a U-shaped configuration.

[0077] Further optionally, the included angle of each second protruding portion 24 on both sides is in the range of 0°-180°. Such a range ensures that the second protruding portion 24 is neither completely closed nor has the advantages of a curved shape, thereby balancing the mechanical and electrical properties to optimize the stress distribution of the first current collecting plate 20, while enhancing the connection reliability.

[0078] In some optional embodiments as Figures 1-3 In some optional embodiments as

[0079] By providing the liquid permeation hole 201 on the first current collecting plate 20, the electrolyte can flow more uniformly to the battery cell area to soak the battery cell part, thereby improving the overall performance and consistency of the battery. In addition, the provision of the liquid permeation hole 201 can also promote the discharge of gas inside the battery, avoiding the problems of increased internal resistance or local overheating caused by bubble accumulation.

[0080] Optionally, the liquid permeation hole 201 can be designed in a circular, elliptical or other geometric shape.

[0081] Further optionally, when there are multiple liquid permeation holes 201, these liquid permeation holes 201 can have the same shape and size, or different shapes and sizes.

[0082] In order to adapt to different battery requirements, the number, shape and position of the liquid permeation hole 201 can be flexibly adjusted according to the actual working conditions, which are not specifically limited in the present application.

[0083] According to some optional embodiments of the present application, as Figures 1-3 As shown in some optional embodiments of the present application, a liquid injection hole 16 is formed on the first cover plate 10, and the liquid injection hole 16 is provided through the thickness direction of the first cover plate 10.

[0084] The liquid injection hole 16 is used to inject electrolyte into the battery interior. Here, the through structure can ensure smooth flow of electrolyte into the battery interior, improving the infiltration efficiency.

[0085] Optionally, the shape of the liquid injection hole 16 can adopt a regular or irregular shape such as a circle, an ellipse, a rectangle, a triangle, etc.

[0086] Further optionally, a sealing pin is arranged at the liquid injection hole 16.

[0087] In some specific embodiments as shown in Figures 1-3 In some specific embodiments as shown in

[0088] Optionally, the shape of the through hole 202 includes any regular or irregular geometric shape such as a circle, an ellipse, a triangle, a rectangle, etc.

[0089] More specifically, please refer to Figure 4 In the direction towards the battery cell, the liquid injection hole 16 includes a main hole section 161, a flow guide hole section 162 and a connecting hole section 163 connected in sequence, and the flow area of the main hole section 161, the flow guide hole section 162 and the connecting hole section 163 decreases in sequence.

[0090] In the above technical solution, the main hole section 161 serves as the main part of the liquid injection hole 16, providing a large inlet area to facilitate the rapid injection of electrolyte.

[0091] The flow area of the flow guide hole section 162 gradually decreases to smoothly guide the flow of electrolyte and reduce turbulence and splashing.

[0092] The connecting hole section 163 further reduces the flow area to smoothly guide the electrolyte into the battery interior.

[0093] By gradually reducing the flow area, it helps to form a stable fluid pressure gradient, improving the controllability and consistency of the liquid injection process, thereby ensuring efficient electrochemical reactions in the battery interior.

[0094] More preferably, the diameter of the flow guide hole section 162 gradually decreases from the main hole section 161 to the connecting hole section 163. Here, the flow guide hole section 162 forms a tapered trapezoidal structure, which helps guide the flow of electrolyte, reduces turbulence and pressure loss during injection, and makes the liquid flow more smoothly and uniformly to the battery cell. At the same time, the tapered hole diameter helps improve the accuracy of the injection, avoiding splashing or local accumulation caused by excessive flow rate. In addition, the structure of gradually reducing the hole diameter also enhances the mechanical strength of the injection hole 16 area to some extent, preventing deformation during high-pressure injection, thereby ensuring the stability and consistency of battery production.

[0095] As shown in Figure 5 , the shell assembly 100 according to some embodiments of the present application also includes a second cover plate 40, a second current collector, and a pole 60. The second cover plate 40 is arranged at opposite ends of the shell assembly 100 with the first cover plate 10, and the second cover plate 40 is provided with an assembly hole 41. The second current collector is arranged on the side of the second cover plate 40 facing the battery cell. The pole 60 is arranged in the assembly hole 41 and is insulated between the second cover plate 40, and the pole 60 is connected to the second current collector for electrical conduction.

[0096] The second cover plate 40 is arranged opposite the first cover plate 10 to jointly enclose the battery shell.

[0097] The assembly hole 41 of the second cover plate 40 is used to mount the pole 60. The pole 60 passes through the assembly hole 41 and remains insulated from the second cover plate 40, ensuring electrical isolation.

[0098] In some optional embodiments, an insulating gasket is provided between the pole 60 and the second cover plate 40. The insulating gasket can be a ceramic gasket, a plastic gasket, etc., used to avoid direct electrical contact between the two.

[0099] Optionally, an insulating material layer is provided on the inner wall of the assembly hole 41 and / or the surface of the pole 60. Here, the insulating material layer can be an epoxy resin coating, a ceramic coating, etc.

[0100] At the same time, the pole 60 achieves electrical conduction by connecting the second current collector, efficiently transmitting the current generated by the battery cell to the external circuit.

[0101] In some optional embodiments, the pole 60 can adopt a closed geometric shape such as a ring, a rectangle, a sector, an arc, a circle, etc. The specific shape of the pole 60 is not limited in the present application.

[0102] In yet some optional embodiments, referring to Figure 5 , the shell assembly 100 further includes a first insulating member 71, which is located on the side of the second cover plate 40 away from the battery cell, and a portion of the first insulating member 71 is located between the second cover plate 40 and the pole 60.

[0103] In the above technical solution, the first insulating piece 71 is arranged on the side of the second cover plate 40 away from the battery cell, and a part of the first insulating piece 71 is located between the second cover plate 40 and the pole 60, thereby playing an insulating role. Through such an arrangement, the first insulating piece 71 effectively prevents accidental conduction between the pole 60 and the second cover plate 40, ensures that the two maintain reliable electrical isolation, and thus improves the safety performance of the battery.

[0104] In addition, the presence of the first insulating piece 71 can also buffer the impact of external impact or vibration on the connection part of the pole 60 and the second cover plate 40, and reduce mechanical damage to the internal components. Optionally, the first insulating piece 71 can be made of a high-temperature-resistant and chemical-corrosion-resistant material, such as a ceramic piece, according to actual needs, to adapt to the requirements of the battery working environment. In summary, such an arrangement not only optimizes the overall structure of the shell assembly 100, but also provides additional support for the pole 60, ensures that it remains stable during long-term use, and further improves the reliability and service life of the battery.

[0105] In some optional embodiments, the shell assembly 100 of the battery further comprises: a second insulating piece 72, which is arranged between the second cover plate 40 and the second current collector plate, and a part of the second insulating piece 72 is located between the second cover plate 40 and the pole 60. Figure 5

[0106] The second insulating piece 72 plays a multiple insulating protection role, further prevents accidental conduction between the pole 60 and the second cover plate 40 and the second current collector plate, and ensures that the current can only be transmitted through the predetermined path.

[0107] At the same time, the second insulating piece 72 can also buffer mechanical stress and reduce the impact of vibration or impact on internal components, thereby improving the stability of the overall structure. Optionally, the second insulating piece 72 can be made of a high-temperature-resistant and chemical-corrosion-resistant material, such as a ceramic piece, according to actual needs, to adapt to the requirements of the battery working environment.

[0108] Specifically, the distance between the outer circumferential surface of the pole 60 and the inner circumferential surface of the assembly hole 41 is set to be 2-10 mm. For example, the distance between the outer circumferential surface of the pole 60 and the inner circumferential surface of the assembly hole 41 is 2 mm, 4 mm, 5 mm, 8 mm, 10 mm, etc. Here, the distance between the outer circumferential surface of the pole 60 and the inner circumferential surface of the assembly hole 41 is controlled to be 2-10 mm, which can prevent accidental contact or discharge risk caused by the pole 60 and the inner wall of the assembly hole 41 being too close, while avoiding excessive spacing causing waste of internal space of the battery. In addition, controlling the distance between the outer circumferential surface of the pole 60 and the inner circumferential surface of the assembly hole 41 within this range can also accommodate assembly tolerances, ensure production consistency, and improve the reliability and safety of the battery.

[0109] According to some optional embodiments of the present application, with reference to​Figures 1-2 The shell assembly 100 further comprises: a first pressure relief valve 73 arranged on the first cover plate 10.

[0110] Here, the first pressure relief valve 73 is used to release the abnormal pressure inside the battery. When the internal pressure of the battery exceeds the safety threshold, the first pressure relief valve 73 can be quickly opened to avoid dangerous situations such as explosion caused by excessive pressure. Further improve the safety performance of the battery.

[0111] Optionally, the shape of the first pressure relief valve 73 includes a circle, an ellipse, a ring-shaped track, etc. The specific shape can be selected according to actual needs, and the application is not limited to the above forms.

[0112] Optimally, the pressure relief valve is located at the eccentric position of the battery cover plate, and the area range is in the interval of 50-80mm2. In this way, it is helpful to ensure the pressure relief efficiency, and to a certain extent, the space utilization of the first cover plate 10 is taken into account.

[0113] More optimally, the first pressure relief valve 73 is located at the edge of the cover plate on one side, and a safety distance of 2-8mm is reserved. It can minimize or even avoid interference with other components, and ensure the structural stability and safety.

[0114] Continuing to refer to Figures 1-2 In some optional embodiments, the first cover plate 10 further comprises: a first buffer protrusion 15 connected to the main body plate 11, the first buffer protrusion 15 is arranged adjacent to the first pressure relief valve 73, and the first buffer protrusion 15 is arranged protruding towards the battery cell relative to the main body plate 11. To support the first current collector plate 20 when pressure relief.

[0115] The first buffer protrusion 15 protrudes towards the battery cell direction, which can effectively support the first current collector plate 20 when pressure relief, preventing the current collector plate from deforming or displacing due to internal pressure changes. This design not only enhances the structural stability, but also ensures the normal work of the internal components of the battery, while providing space protection for the smooth operation of the pressure relief valve.

[0116] Optionally, the position and number of the first buffer protrusion 15 are not limited.

[0117] In some embodiments as shown in Figures 1-2 The first buffer protrusion 15 is two, and is respectively located at both ends of the first pressure relief valve 73 in the length direction. In this way, the first current collector plate 20 can be more evenly supported when pressure relief, avoiding deformation caused by uneven stress, while maximizing the use of the space of the first cover plate 10, ensuring the structural stability and functionality.

[0118] Optionally, the shape of the first buffer protrusion 15 can include a circle, an ellipse, a rectangle, or other polygons.

[0119] Referring to Figures 1-2The first buffer protrusion 15 is in the shape of an ellipse.

[0120] According to some optional shell assemblies 100, further comprising: a second air release valve arranged on the second cover plate 40.

[0121] Here, the second air release valve is arranged on the second cover plate 40 to release abnormal pressure inside the battery and ensure the safety of the battery. When the pressure inside the battery exceeds a set threshold, the second air release valve quickly opens to prevent dangerous situations such as explosions caused by excessive pressure, further improving the overall safety of the battery.

[0122] In some optional embodiments, the second cover plate 40 is provided with a second buffer protrusion protruding towards the battery cell, and the second buffer protrusion is arranged adjacent to the second air release valve to support the second current collector plate when pressure is released.

[0123] In this way, when the battery releases pressure, the second buffer protrusion can effectively support the second current collector plate to prevent it from deforming or shifting due to changes in internal pressure, thereby ensuring structural stability and ensuring the normal operation of the internal components of the battery.

[0124] Optionally, the shape of the second buffer protrusion can include a circle, an ellipse, a rectangle, or other polygons.

[0125] Further optionally, the shell assembly 100 further comprises: an outer cylinder connected to the first cover plate 10 and the second cover plate 40 at both ends. The outer cylinder and the first cover plate 10 and the second cover plate 40 are independent pieces, or the outer cylinder and one of the first cover plate 10 and the second cover plate 40 are integrated.

[0126] In the above technical solution, the two ends of the outer cylinder are connected to the first cover plate 10 and the second cover plate 40, respectively, to form a sealed cavity of the battery.

[0127] The connection mode of the outer cylinder and the first cover plate 10 and the second cover plate 40 has two kinds: one is that all three are independent pieces, and the assembly is achieved by welding or sealing connection. The other is that the outer cylinder and one of the first cover plate 10 and the second cover plate 40 are integrated, which reduces the assembly process and improves the structural strength and sealing performance through integrated design.

[0128] In some specific embodiments, in combination with Figure 1 and Figure 2 The first cover plate 10 further comprises a flange portion 18 connected to the edge of the main plate portion 11. The flange portion 18 is fused with the end face of the outer cylinder by laser welding to achieve the sealing performance of the battery, effectively prevent electrolyte leakage or external moisture intrusion, and ensure the operation reliability of the battery.

[0129] The battery according to the second aspect of the utility model, comprising: shell assembly 100 and electric core, shell assembly 100 includes accommodation cavity, and electric core is located in accommodation cavity, here, shell assembly 100 is the shell assembly 100 in the first aspect of the utility model, by the improved shell assembly 100, can effectively promote the use performance and security of battery, optimize current transmission efficiency, enhance structural stability, reduce potential risk simultaneously, ensure that battery reliable operation.

[0130] The power utilization device according to the third aspect of the utility model, including the battery according to the second aspect of the utility model, by utilizing the improved battery, improve the overall performance and operating efficiency of power utilization device, ensure that electric energy transmission is more stable and efficient, simultaneously, enhance the security and reliability of power utilization device, prolong the service life of power utilization device.

[0131] The following refers to Figure 1 - Figure 5 A specific embodiment is described in detail to the shell assembly 100 according to the utility model embodiment. It is worth understanding that the following description is only exemplary, and is not a specific limitation of the utility model.

[0132] Referring to Figure 1 , shell assembly 100 includes: first cover plate 10, first current collector 20, second cover plate 40, second current collector, pole 60, first insulating part 71, second insulating part 72, first gas relief valve 73 and second gas relief valve.

[0133] Referring to Figure 2 , first cover plate 10 includes: main plate part 11, first protruding part 13, first buffer protrusion 15 and flange part 18.

[0134] First protruding part 13 and first buffer protrusion 15 are connected with main plate part 11.

[0135] First current collector 20 is arranged on the side of first cover plate 10 towards electric core.

[0136] Wherein, first protruding part 13 is arranged protruding towards electric core relative to main plate part 11, and the surface of first protruding part 13 towards electric core is first welding area 131.

[0137] First cover plate 10 further includes: liquid injection hole 16, liquid injection hole 16 is arranged through along the thickness direction of first cover plate 10.

[0138] Referring to Figure 4The liquid injection hole 16 comprises, in the direction towards the battery cell, a main hole section 161, a flow guide hole section 162 and a connecting hole section 163 connected in sequence, and the flow passage areas of the main hole section 161, the flow guide hole section 162 and the connecting hole section 163 decrease in sequence. In the direction from the main hole section 161 to the connecting hole section 163, the hole diameter of the flow guide hole section 162 gradually decreases.

[0139] Referring to Figure 3 , the first current collector plate 20 is provided with liquid permeation holes 201 and through holes 202. The liquid permeation holes 201 are multiple and arranged in central symmetry with the through holes 202 as the center.

[0140] The through holes 202 are arranged opposite to the liquid injection hole 16 on the first cover plate 10. The shapes of the through holes 202 and the liquid injection hole 16 are both circular.

[0141] The first gas release valve 73 is arranged on the first cover plate 10.

[0142] The first buffer protrusion 15 is arranged adjacent to the first gas release valve 73, and the first buffer protrusion 15 is arranged protruding towards the battery cell relative to the main plate part 11 to support the first current collector plate 20 when pressure relief.

[0143] The flange part 18 is connected to the main plate part 11 and located at the edge of the main plate part 11.

[0144] The first current collector plate 20 further comprises a plate body 22 and a second protrusion part 24, and the part surface of the plate body 22 towards the first cover plate 10 is a second welding area 221. The second protrusion part 24 is connected to the plate body 22 and arranged protruding towards the battery cell relative to the plate body 22, and the surface of the second protrusion part 24 towards the battery cell is a third welding area for welding connection with the tab of the battery cell.

[0145] The second welding area 221 and the first welding area 131 are both planar, and the second welding area 221 and the first welding area 131 are in surface contact and welded connection.

[0146] The center of the first protrusion part 13 is located at the center of the first cover plate 10, and the multiple second protrusion parts 24 are arranged in central symmetry relative to the center of the first cover plate 10.

[0147] Referring to Figure 5 , the second cover plate 40 is arranged at opposite ends of the shell assembly 100 with the first cover plate 10, and the second cover plate 40 is provided with an assembly hole 41.

[0148] The second current collector plate is arranged on the side of the second cover plate 40 towards the battery cell.

[0149] The pole 60 is arranged through the assembly hole 41 and insulated between the second cover plate 40, and the pole 60 is connected to the second current collector plate for electrical conduction.

[0150] The first insulating member 71 is located on the side of the second cover plate 40 away from the battery cell, and a portion of the first insulating member 71 is located between the second cover plate 40 and the pole 60.

[0151] The second insulating member 72 is arranged between the second cover plate 40 and the second current collector, and a portion of the second insulating member 72 is located between the second cover plate 40 and the pole 60.

[0152] The distance between the outer circumferential surface of the pole 60 and the inner circumferential surface of the assembly hole 41 is 2-10 mm.

[0153] The second gas release valve is arranged on the second cover plate 40. The second cover plate 40 is provided with a second buffer protrusion protruding towards the battery cell, and the second buffer protrusion is arranged adjacent to the second gas release valve to support the second current collector when pressure is released.

[0154] Other configurations of the shell assembly according to the embodiments of the present application, such as batteries and electric devices, and operations are known to those skilled in the art, and will not be described in detail here.

[0155] In the description of the present specification, the description referring to the terms "embodiment", "example", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0156] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements, and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery casing assembly, characterized in that, include: A first cover plate, the first cover plate including a main body plate portion and a connected first protrusion portion; The first current collector is located on the side of the first cover plate facing the battery cell; The first protrusion protrudes towards the battery cell relative to the main body plate, and the surface of the first protrusion facing the battery cell is the first welding area, while the surface of the first current collector facing the first cover plate is the second welding area. The surfaces where the second welding area and the first welding area are located are both smooth surfaces, and the second welding area and the first welding area are in surface contact and welded together.

2. The battery casing assembly according to claim 1, characterized in that, The surfaces where the second welding area and the first welding area are located are both planes.

3. The battery casing assembly according to claim 1, characterized in that, The first collector also includes: The disc body, wherein the portion of the disc body facing the first cover plate is the second welding area; The second protrusion is connected to the disk body and protrudes towards the battery cell relative to the disk body. The surface of the second protrusion facing the battery cell is a third welding area, which is used for welding to the electrode tab of the battery cell.

4. The battery casing assembly according to claim 3, characterized in that, The second protrusion is at least two, and is spaced apart around the first protrusion.

5. The battery casing assembly according to claim 4, characterized in that, The center of the first protrusion is located at the center of the first cover plate, and at least two second protrusions are arranged in a centrally symmetrical manner relative to the center of the first cover plate.

6. The battery casing assembly according to claim 1, characterized in that, The first manifold is provided with at least one seepage hole.

7. The battery casing assembly according to claim 1, characterized in that, An injection hole is formed on the first cover plate, and the injection hole is arranged to extend through the thickness direction of the first cover plate.

8. The battery casing assembly according to claim 7, characterized in that, A through hole is formed on the first manifold, and the through hole is positioned opposite to the injection hole.

9. The battery casing assembly according to claim 7, characterized in that, In the direction toward the battery cell, the injection hole includes a main hole section, a guide hole section, and a connecting hole section connected in sequence, and the flow area of ​​the main hole section, the guide hole section, and the connecting hole section decreases in sequence.

10. The battery housing assembly according to claim 9, characterized in that, The diameter of the guide hole gradually decreases from the main hole section to the connecting hole section.

11. The battery housing assembly according to any one of claims 1-10, characterized in that, Also includes: A second cover plate is disposed at opposite ends of the housing assembly, and the second cover plate is provided with mounting holes. The second current collector is located on the side of the second cover plate facing the battery cell; The electrode post passes through the mounting hole and is insulated from the second cover plate. The electrode post is connected to the second collector plate for conduction.

12. The battery housing assembly according to claim 11, characterized in that, Also includes: A first insulating element is located on the side of the second cover plate away from the battery cell, and a portion of the first insulating element is located between the second cover plate and the electrode post.

13. The battery housing assembly according to claim 11, characterized in that, Also includes: The second insulating element is disposed between the second cover plate and the second collector plate, and a portion of the second insulating element is located between the second cover plate and the pole post.

14. The battery housing assembly according to claim 11, characterized in that, The distance between the outer peripheral surface of the pole post and the inner peripheral surface of the mounting hole is 2 to 10 mm.

15. The battery housing assembly according to any one of claims 1-10, characterized in that, Also includes: The first vent valve is disposed on the first cover plate.

16. The battery housing assembly according to claim 15, characterized in that, The first cover plate further includes: a first buffer protrusion connecting the main body plate, the first buffer protrusion being disposed near the first vent valve, the first buffer protrusion being disposed opposite the main body plate toward the battery cell, so as to support the first collector plate during pressure relief.

17. The battery housing assembly according to claim 11, characterized in that, Also includes: The second vent valve is disposed on the second cover plate.

18. The battery housing assembly according to claim 17, characterized in that, The second cover plate is provided with a second buffer protrusion protruding toward the battery cell. The second buffer protrusion is located near the second vent valve to support the second collector plate when pressure is released.

19. The battery housing assembly according to claim 11, characterized in that, Also includes: The outer cylinder is connected at both ends to the first cover plate and the second cover plate; The outer cylinder and the first cover plate and the second cover plate are either independent components, or the outer cylinder and one of the first cover plate and the second cover plate are integral components.

20. A battery, characterized in that, include: The housing assembly according to any one of claims 1-19, the housing assembly comprising a receiving cavity; The battery cell is disposed within the accommodating cavity.

21. An electrical appliance, characterized in that, Includes the battery according to claim 20.

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