Cover plate, battery packaging structure / top cover, battery shell, battery and battery module

Abstract

The utility model discloses a cover plate, a battery packaging structure / top cover, a battery shell, a battery and a battery module. The battery packaging top cover comprises a cover plate, a current collecting piece, a pole and a sealing ring, the pole penetrates through the cover plate and the current collecting piece, the cover plate and the current collecting piece are fixedly combined through riveting of the pole, and the sealing ring is arranged between the cover plate and the current collecting piece and enables the cover plate, the current collecting piece and the pole to be matched in a sealing mode. According to the battery packaging top cover disclosed by the embodiment of the utility model, the technological process in production is greatly simplified, and the product performance can also be improved.

Description

Technical Field

[0001] This utility model specifically relates to a cover plate, a battery packaging structure / top cover, a battery casing, a battery, and a battery module, belonging to the field of battery packaging technology. Background Technology

[0002] Currently, battery cover structures are joined using traditional riveting methods, which involve welding the terminals to the current collector, and then riveting the terminals, upper insulation, cover, sealing ring, and lower insulation together using the terminals. This method has two drawbacks: 1) Welding the terminals to the current collector, using copper terminals, requires expensive welding equipment; secondly, welding the current collector to the terminals can lead to detachment at the welded area, causing product failure. 2) The production process is complex, and the labor costs for control and assembly are high.

[0003] In summary, the existing battery cover manufacturing process is complex. Due to the instability of welding equipment and tooling, the current collector and terminal post may detach from the battery cover, causing battery failure. Utility Model Content

[0004] The main purpose of this utility model is to provide a cover plate, a battery packaging structure / top cover, a battery shell, a battery, and a battery module, thereby overcoming the shortcomings of the prior art.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0006] The first aspect of this utility model provides a cover plate for a battery package top cover, which includes: a first insulating part, a cover plate main body part, and a second insulating part. The cover plate main body part is disposed between the first insulating part and the second insulating part. The cover plate is also provided with a first riveting hole, which passes through the cover plate along the axial direction of the cover plate. The first insulating part and the second insulating part are integrally formed by injection molding. The cover plate main body part, the first insulating part, and the second insulating part are integrated into a single injection molding process.

[0007] A second aspect of this utility model provides a current collector for a battery package top cover, comprising: a current collector portion and a terminal portion, wherein the terminal portion is located at one end of the current collector portion, the current collector portion and the terminal portion are integrally formed by cold heading or metal rolling processes, and the terminal portion is further provided with a second riveting hole.

[0008] A third aspect of this utility model provides a terminal post for a battery encapsulation top cover, comprising: a terminal post body and a housing, wherein the terminal post body includes a base portion and a column portion extending axially from the base portion, and the housing covers at least one end of the column portion away from the base portion, and the housing is in electrical contact with the terminal post body.

[0009] A fourth aspect of this utility model provides a battery encapsulation top cover, comprising:

[0010] A cover plate, the cover plate including a first insulating part, a cover plate body part and a second insulating part, the cover plate body part being disposed between the first insulating part and the second insulating part, and the cover plate also having a first riveting hole, the first riveting hole penetrating the cover plate along the axial direction of the cover plate;

[0011] A current collector, comprising a current collecting portion and a terminal portion, wherein the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and further wherein the terminal portion is provided with a second riveting hole;

[0012] The electrode post passes through the first riveting hole and the second riveting hole, and is riveted to the cover plate and the current collector. The electrode post is insulated from the cover plate but electrically connected to the current collector.

[0013] A sealing ring is disposed between the cover plate and the current collector plate. The sealing ring surrounds the pole post, and the sealing ring deforms under pressure to form a sealing fit with the pole post, the cover plate, and the current collector plate.

[0014] A fifth aspect of this utility model provides a battery packaging structure, which includes: a cover plate of the battery packaging top cover, or a current collector of the battery packaging top cover, or a terminal post of the battery packaging top cover, or the battery packaging top cover.

[0015] A sixth aspect of the present invention provides a battery casing, comprising: a housing and a battery encapsulation top cover, or, the battery encapsulation structure wherein the battery encapsulation top cover is fixedly connected to the housing.

[0016] A seventh aspect of the present invention provides a battery comprising: a battery core and a battery casing, wherein the battery core is encapsulated within the battery casing, and the tabs of the battery core are electrically connected to the terminals.

[0017] An eighth aspect of the present invention provides a battery module, characterized in that it includes a plurality of said batteries, wherein the plurality of said batteries are connected in series and / or in parallel.

[0018] Compared with the prior art, the advantages of this utility model include:

[0019] The battery encapsulation top cover in this embodiment of the present invention not only greatly simplifies the production process but also improves product performance.

[0020] In one embodiment of this utility model, a battery encapsulation top cover is obtained by integral injection molding of the cover plate main body, the first insulating part, and the second insulating part. This method can save on manual assembly costs and reduce riveting defects caused by assembly.

[0021] In one embodiment of this utility model, a battery encapsulation top cover is integrally molded onto the surface of the main body of the cover using a PPS injection molding process. The PPS injection molding structure replaces the upper and lower insulating components of the traditional cover, which can also improve the bending strength of the cover.

[0022] This utility model provides a battery packaging top cover that adopts an integrated current collector and terminal structure, which saves equipment costs and improves product performance. Furthermore, the current collector and terminal portions in the current collector provided in this utility model embodiment are integrally formed by cold forging or rolling (the thinnest area is within 1 / 6 of the thickest area), and the insulation portion is injection molded with the cover body using PPS injection molding. This increases the cover's bending strength and elastic recovery capability, improving bending strength by 20%. Additionally, this utility model uses a compression seal for the terminal post, the cover's insulation portion, and the sealing ring; both the terminal post and the cover's insulation portion are rigid structures, ensuring high reliability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 , Figure 2 This is an exploded view of the structure of a battery encapsulation top cover provided in a typical embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of a battery encapsulation top cover provided in a typical embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the cover plate in a battery encapsulation top cover provided in a typical embodiment of this utility model;

[0027] Figure 5This is a schematic diagram of the longitudinal cross-sectional structure of the current collector of a battery packaging top cover provided in a typical embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the terminal post in the top cover of a battery package provided in a typical embodiment of this utility model;

[0029] Figure 7 This is a structural schematic diagram of the configuration of the terminal posts and sealing rings in a battery encapsulation top cover, provided in a typical embodiment of this utility model;

[0030] Figure 8 , Figure 9 This is a schematic diagram of the structure of the terminal post in the top cover of a battery package, provided in a typical embodiment of this utility model. Detailed Implementation

[0031] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0032] The first aspect of this utility model provides a cover plate for a battery package top cover, which includes: a first insulating part, a cover plate main body part, and a second insulating part. The cover plate main body part is disposed between the first insulating part and the second insulating part. The cover plate is also provided with a first riveting hole, which passes through the cover plate along the axial direction of the cover plate. The first insulating part and the second insulating part are integrally formed by injection molding. The cover plate main body part, the first insulating part, and the second insulating part are integrated into a single injection molding process.

[0033] Furthermore, the main body of the cover plate is a metal structure, while the first insulating part and the second insulating part are polyphenylene sulfide structures.

[0034] Furthermore, all of the first riveting holes are disposed within the injection molding body containing the first insulating portion and the second insulating portion.

[0035] Furthermore, the second insulating part is provided with a first groove structure, a second groove structure and a third groove structure. The groove opening of the first groove structure is located on the second side of the second insulating part opposite to the first insulating part. The groove opening of the second groove structure is located at the bottom of the groove of the first groove structure. The groove opening of the third groove structure is located at the bottom of the groove of the second groove structure. The bottom of the groove of the third groove structure is in communication with the first riveting hole.

[0036] Furthermore, the area of ​​the radial cross-section of the third groove structure gradually decreases in the direction away from the second groove structure.

[0037] Furthermore, a fourth groove-shaped structure is provided on the first side of the first insulating part facing away from the second insulating part, and the bottom of the groove-shaped structure is in communication with the first riveting hole.

[0038] Furthermore, the cover plate is also provided with a pressure relief hole, which extends through the cover plate along its axial direction.

[0039] A second aspect of this utility model provides a current collector for a battery package top cover, comprising: a current collector portion and a terminal portion, wherein the terminal portion is located at one end of the current collector portion, the current collector portion and the terminal portion are integrally formed by cold heading or metal rolling processes, and the terminal portion is further provided with a second riveting hole.

[0040] Furthermore, the current collector is a cold-forged part integrally formed by a cold-forging process, or the current collector is a rolled part formed by metal rolling.

[0041] Furthermore, the second riveting hole includes a first hole segment and a second hole segment arranged sequentially along its own axial direction, wherein the diameter of the first hole segment is smaller than the diameter of the second hole segment.

[0042] Furthermore, the terminal portion is generally circular or square in structure.

[0043] Furthermore, the thickness of the terminal portion is greater than the thickness of the current collector portion, and the connection between the terminal portion and the current collector portion has a rounded corner structure.

[0044] Furthermore, the current collector is a pure copper component or a nickel-plated copper component.

[0045] A third aspect of this utility model provides a terminal post for a battery encapsulation top cover, comprising: a terminal post body and a housing, wherein the terminal post body includes a base portion and a column portion extending axially from the base portion, and the housing covers at least one end of the column portion away from the base portion, and the housing is in electrical contact with the terminal post body.

[0046] Furthermore, both the pole body and the shell are metal components, and the metal reactivity of the pole body and the shell is different.

[0047] Furthermore, one of the pole body and the shell is a copper component, and the other is an aluminum component.

[0048] Furthermore, the end face of the column portion facing away from the base portion has a deformation guide hole that guides the column portion to deform outward along its own radial direction. When the pole post is subjected to pressure applied along its own axial direction, the end portion where the deformation guide hole is located can deform in the radial direction of the pole post to form a head. The deformation includes bending and / or extending outward from the deformation guide hole.

[0049] Furthermore, the diameter of the deformation guide hole gradually decreases in the direction away from the end face.

[0050] Furthermore, the deformation guide hole is a tapered hole.

[0051] Furthermore, the column portion includes a first column segment and a second column segment arranged sequentially along its own axial direction. The first column segment is fixedly connected to the base portion. The deformation guide hole is disposed on the end face of the second column segment opposite to the first column segment. The diameter of the second column segment is smaller than the diameter of the first column segment. The shell covers the second column segment.

[0052] Furthermore, the diameter of the second cylindrical segment and the entire shell is equal to the diameter of the first cylindrical segment.

[0053] A fourth aspect of this utility model provides a battery encapsulation top cover, comprising:

[0054] A cover plate, the cover plate including a first insulating part, a cover plate body part and a second insulating part, the cover plate body part being disposed between the first insulating part and the second insulating part, and the cover plate also having a first riveting hole, the first riveting hole penetrating the cover plate along the axial direction of the cover plate;

[0055] A current collector, comprising a current collecting portion and a terminal portion, wherein the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and further wherein the terminal portion is provided with a second riveting hole;

[0056] The electrode post passes through the first riveting hole and the second riveting hole, and is riveted to the cover plate and the current collector. The electrode post is insulated from the cover plate but electrically connected to the current collector.

[0057] A sealing ring is disposed between the cover plate and the current collector plate. The sealing ring surrounds the pole post, and the sealing ring deforms under pressure to form a sealing fit with the pole post, the cover plate, and the current collector plate.

[0058] Furthermore, the first insulating part and the second insulating part are integrally formed by injection molding process, and the cover plate body is integrated with the first insulating part and the second insulating part by a single injection molding process to form an interlocking structure.

[0059] Furthermore, the main body of the cover plate is a metal structure, while the first insulating part and the second insulating part are polyphenylene sulfide structures.

[0060] Furthermore, all of the first riveting holes are disposed within the injection molding body containing the first insulating portion and the second insulating portion.

[0061] Furthermore, the second insulating part is provided with a first groove structure, a second groove structure, and a third groove structure. The groove opening of the first groove structure is located on the second side of the second insulating part opposite to the first insulating part. The groove opening of the second groove structure is located at the bottom of the groove of the first groove structure. The groove opening of the third groove structure is located at the bottom of the groove of the second groove structure. The bottom of the groove of the third groove structure is in communication with the first riveting hole. The sealing ring is disposed in the second groove structure and the third groove structure and is tightly fitted with the groove walls of the second groove structure and the third groove structure. The terminal part of the current collector is disposed in the first groove structure and is in close contact with the sealing ring.

[0062] Furthermore, the area of ​​the radial cross-section of the third groove structure gradually decreases in the direction away from the second groove structure.

[0063] Furthermore, a fourth groove-shaped structure is provided on the first side of the first insulating part facing away from the second insulating part. The bottom of the groove of the fourth groove-shaped structure is connected to the first riveting hole. The first end of the pole post is disposed in the fourth groove-shaped structure. A fifth groove-shaped structure is provided on the third side of the terminal part facing away from the cover plate. The bottom of the groove of the fifth groove-shaped structure is connected to the second riveting hole. The second end of the pole post is disposed in the fifth groove-shaped structure. In this case, one of the first end and the second end of the pole post is a head, or both the first end and the second end of the pole post are heads.

[0064] Furthermore, the pole post includes a pole post body and a shell. The pole post body includes a base portion and a column portion extending axially from the base portion. The shell portion covers at least one end of the column portion away from the base portion. The shell portion is in electrical contact with the pole post body. The base portion is located at the first end, and the shell portion is located at the second end. The abutment is formed by the deformation of the column portion and the shell portion covering the column portion after being stamped.

[0065] Furthermore, both the pole body and the shell are metal components, and the metal reactivity of the pole body and the shell is different.

[0066] Furthermore, one of the pole body and the shell is a copper component, and the other is an aluminum component.

[0067] Furthermore, the column portion includes a first column segment and a second column segment arranged sequentially along its own axial direction. The first column segment is fixedly connected to the base portion. The diameter of the second column segment is smaller than the diameter of the first column segment. The shell covers the second column segment. The abutment is formed by the deformation of the second column segment and the shell.

[0068] Furthermore, the diameter of the second cylindrical segment and the entire shell is equal to the diameter of the first cylindrical segment.

[0069] Furthermore, the sealing ring surrounds and covers a portion of the housing away from the first cylindrical segment.

[0070] Furthermore, the current collector and the terminal are integrally formed by cold heading or metal rolling processes.

[0071] Furthermore, the second riveting hole includes a first hole segment and a second hole segment arranged sequentially along its own axial direction. The diameter of the first hole segment is smaller than the diameter of the second hole segment, and the second hole segment serves as the fifth groove structure.

[0072] Furthermore, the terminal portion is generally circular or square in structure.

[0073] Furthermore, the thickness of the terminal portion is greater than the thickness of the current collector portion, and the connection between the terminal portion and the current collector portion has a rounded corner structure.

[0074] Furthermore, the current collector is a pure copper component or a nickel-plated copper component.

[0075] Furthermore, the battery package top cover also includes an explosion-proof valve, which is disposed inside the cover plate.

[0076] Furthermore, the cover plate is provided with a pressure relief hole that penetrates the cover plate, and the explosion-proof valve is disposed in the pressure relief hole.

[0077] Furthermore, a dustproof sheet is also provided on the cover plate, which covers the pressure relief hole.

[0078] A fifth aspect of this utility model provides a battery packaging structure, which includes: a cover plate of the battery packaging top cover, or a current collector of the battery packaging top cover, or a terminal post of the battery packaging top cover, or the battery packaging top cover.

[0079] A sixth aspect of the present invention provides a battery casing, comprising: a housing and a battery encapsulation top cover, or, the battery encapsulation structure wherein the battery encapsulation top cover is fixedly connected to the housing.

[0080] A seventh aspect of the present invention provides a battery comprising: a battery core and a battery casing, wherein the battery core is encapsulated within the battery casing, and the tabs of the battery core are electrically connected to the terminals.

[0081] An eighth aspect of the present invention provides a battery module, characterized in that it includes a plurality of said batteries, wherein the plurality of said batteries are connected in series and / or in parallel.

[0082] The following will further explain the technical solution, its implementation process and principle in conjunction with the accompanying drawings and specific implementation examples. Unless otherwise specified, the explosion-proof valve, dustproof sticker, sealing ring and other components mentioned in the embodiments of this utility model can be obtained by commercial purchase or conventional processing in the field. The cold heading process and injection molding process mentioned in the embodiments of this utility model are known in the field, and the equipment they rely on is also known in the field. No specific limitations are made here.

[0083] Please see Figure 1 and Figure 2 In a typical implementation, a battery encapsulation top cover includes a cover plate 100, a current collector 200, a terminal post 400, and a sealing ring 300. The terminal post 400 passes through the cover plate 100 and the current collector 200. The cover plate 100 and the current collector 200 are riveted and fixed together by the terminal post 400. The sealing ring 300 is disposed between the cover plate 100 and the current collector 200, and provides a sealed fit between the cover plate 100, the current collector 200, and the terminal post 400.

[0084] Please refer to the following for details. Figure 2 , Figure 3 and Figure 4 The cover plate 100 includes a first insulating part 120, a cover plate body part 110, and a second insulating part 130. The cover plate body part 110 is disposed between the first insulating part 120 and the second insulating part 130. The cover plate 100 also has a first riveting hole 140 that continuously penetrates the first insulating part 120, the cover plate body part 110, and the second insulating part 130. The current collector 200 includes a current collector part 210 and a terminal part 220. The terminal part 220 is located at one end of the current collector part 210 and is electrically connected to the current collector part 210. The terminal portion 220 is connected, and a second riveting hole 240 is provided on it. The pole post 400 passes through the first riveting hole 140 and the second riveting hole 240 and is riveted to the cover plate 100 and the current collector 200. The pole post 400 is insulated from the cover plate 100 but electrically connected to the current collector 200. The sealing ring 300 is disposed between the cover plate 100 and the current collector 200. The sealing ring 300 surrounds the pole post 400. The sealing ring 300 deforms under pressure and seals with the pole post 400, the cover plate 100 and the current collector 200.

[0085] For details, please refer to the following document again. Figure 3 and Figure 4 The cover plate main body 110 is a metal structure, while the first insulating part 120 and the second insulating part 130 are insulating structures such as polyphenylene sulfide. The first insulating part 120 and the second insulating part 130 are integrally formed by injection molding. The cover plate main body 110, the first insulating part 120, and the second insulating part 130 are integrated into a single injection molding process. All of the first riveting holes 140 are located within the injection molded body containing the first insulating part 120 and the second insulating part 130. It should be noted that the sealing ring 300 is specifically located between the second insulating part 130, the current collector 200, and the pole post 400, and the sealing ring 300 directly contacts the second insulating part 130.

[0086] Specifically, the cover plate 100 is produced by first placing the main body 110 of the cover plate into an injection mold, then injecting PPS into the mold, and allowing it to cool and solidify to obtain a PPS injection-molded cover plate. The main body 110, the first insulating part 120, and the second insulating part 130 are injection molded into one piece using the PPS injection molding process. On the one hand, the cover plate 100 obtained by PPS injection molding can greatly reduce the number of parts. On the other hand, the first insulating part 120 and the second insulating part 130 of the injection-molded cover plate 100 are made of PPS, which is a relatively hard material. After injection molding, the overall strength of the cover plate 100 will be increased. Thus, after being riveted to the current collector 200 and forming a battery, the battery failure problem caused by bending of the cover plate 100 due to external force can be effectively avoided. Specifically, this utility model uses injection molding to integrally form the metal part that serves as the main body of the cover plate with the first insulating part and the second insulating part. Compared with the traditional cover plate, the cover plate in this utility model embodiment has better bending resistance and good elasticity. When subjected to external pressure, the deformation is small. The traditional aluminum cover plate is a rigid structure and undergoes plastic deformation when subjected to external force, and does not have the ability to return to its initial state.

[0087] Specifically, the second insulating part 130 is provided with a first groove structure 131, a second groove structure 132, and a third groove structure 133. The groove opening of the first groove structure 131 is located on the second side of the second insulating part 130 opposite to the first insulating part 120. The groove opening of the second groove structure 132 is located at the bottom of the groove of the first groove structure 131. The groove opening of the third groove structure 133 is located at the bottom of the groove of the second groove structure 132. The bottom of the groove of the third groove structure 133 is in communication with the first riveting hole 140. The sealing ring 300 is disposed in the second groove structure 132 and the third groove structure 133 and is tightly fitted with the groove walls of the second groove structure 132 and the third groove structure 133. The terminal part 220 of the current collector 200 is disposed in the first... Within the groove structure 131, and in close contact with the sealing ring 300, a fourth groove structure 121 is provided on the first side of the first insulating part 120 opposite to the second insulating part 130. The bottom of the groove of the fourth groove structure 121 is connected to the first riveting hole 140. The first end of the pole post 400 is located within the fourth groove structure 121. A fifth groove structure 221 is provided on the third side of the terminal part 220 opposite to the cover plate 100. The bottom of the groove of the fifth groove structure 221 is connected to the second riveting hole 240. The second end of the pole post 400 is located within the fifth groove structure 221. Either the first end or the second end of the pole post 400 is a head 440, or both the first end and the second end of the pole post 400 are heads 440. It is understood that the head at one end of the pole post 400 is relatively large, and the head 440 is formed by radial deformation of one end of the pole post 400 under pressure applied along its own axial direction.

[0088] It should be noted that the shape of the first insulating part 120 in this embodiment can be circular, rectangular, rhomboid, etc., but is not limited to these. Similarly, the outline shape of the sealing ring 300 in this embodiment can be circular, rectangular, etc. Likewise, the outline shapes of the pole post 400 and the first groove structure 131, the second groove structure 132, the third groove structure 133, the fourth groove structure 121, and the fifth groove structure 221 can also be selected according to specific needs, without specific limitations. Furthermore, the depth and other dimensions of the first groove structure 131, the second groove structure 132, the third groove structure 133, the fourth groove structure 121, and the fifth groove structure 221 can be designed according to specific circumstances, without specific limitations.

[0089] Specifically, the sealing ring 300 has an annular structure, and its outer ring surface can have a stepped structure, i.e., the outer ring surface of the sealing ring 300 is a stepped surface. The stepped structure on the sealing ring 300 is adapted to the stepped structure between the second groove structure 132 and the third groove structure 133. When the sealing ring 300 is compressed and deformed, it can maintain a tight seal by making close contact with the groove walls of the second groove structure 132 and the third groove structure 133. The stepped structure of the sealing ring 300 can increase the contact area with the cover plate 100 and improve the sealing effect. To further improve the sealing effect of the sealing ring 300, the radial cross-sectional area of ​​the third groove structure 133 gradually decreases in the direction away from the second groove structure 132. Through this design, the deformation of the sealing ring 300 under the same pressure can be sufficient, so that it can make a tighter contact with the cover plate 100. For example, the contour shape of the third groove structure 133 can be a frustum structure, etc. For example, the sealing ring 300 can be a rubber ring, etc.

[0090] For details, please refer to Figure 5 The current collector 210 and the terminal 220 are integrally formed by cold heading or metal rolling processes. Specifically, the radial width of the fourth groove structure 121 is greater than the radial width of the second riveting hole 240, through which the pole post 400 can pass. The fourth groove structure 121 allows the pole post 400 to be flanged to form a head, thereby ensuring the riveting strength of the pole post 400. Specifically, the thickness of the terminal 220 is greater than the thickness of the current collector 210, and the connection between the terminal 220 and the current collector 210 has a rounded corner structure. It should be noted that the current collector 210 is also provided with other structures that enable it to perform its current collection function. These structures are known in the art and are not specifically limited here. Specifically, the current collector 200 is an integrally formed part by cold heading or metal rolling processes, specifically a metal part, such as a pure copper component or a nickel-plated copper component. The specific cold heading process is not specifically limited. It should be noted that the fourth groove structure 121 and the second riveting hole 240 can be integrated. The second riveting hole includes a first hole segment and a second hole segment arranged sequentially along its own axial direction. The diameter of the first hole segment is smaller than the diameter of the second hole segment. The second hole segment serves as the fifth groove structure.

[0091] Please refer to the following for details. Figure 3 , Figures 6-9The pole post 400 includes a pole post body 410 and a shell 420. The pole post body 410 includes a base portion 411 and a column portion 412 extending from the base portion 411 along its own axial direction. The diameter of the base portion 411 is much larger than the diameter of the column portion 412. The column portion 412 includes a first column segment 4121 and a second column segment 4122 arranged sequentially along its own axial direction. The first column segment 4121 is fixedly connected to the base portion 411. The diameter of the second column segment 4122 is smaller than the diameter of the first column segment 4121. The shell 420 encloses the second column segment 4122. The body segment 4122, with the sealing ring 300 surrounding and covering a portion of the shell 420 away from the first column segment 4121, is understood to have both ends of the shell 420 exposed outside the sealing area of ​​the sealing ring 300. The base portion 411 of the pole post 400 can serve as a head, and the other head of the pole post 400 is formed by the deformation of the second column segment 4122 of the column portion 412 and the shell 420 surrounding the second column segment 4122 after stamping. This deformation includes bending and / or extending radially outward along the pole post 400. It should be noted that the first end of the pole post 400 is the end where the base portion 411 is located, and the second end is the end where the shell 420 is located.

[0092] Specifically, both the electrode body 410 and the casing 420 are metal components, and the metal reactivity of the electrode body 410 and the casing 420 is different. More specifically, one of the electrode body 410 and the casing 420 is a copper component, and the other is an aluminum component. Compared with pure copper electrodes, the electrode provided in this embodiment is formed by a copper and aluminum composite, which is cheaper. When the battery package top cover is used as the negative electrode top cover, the copper casing is in contact with the electrolyte, which can prevent it from reacting chemically with the electrolyte (aluminum metal is relatively active, positively charged, and easily reacts chemically with negatively charged electrolytes). In this embodiment, after riveting, the distance L1 from the copper casing to the current collector is greater than the distance L2 from the bottom of the sealing ring 300 to the current collector. In this way, the sealing effect is achieved by the sealing ring 300 pressing against the electrode 400, and the electrolyte will not come into contact with the aluminum structure of the electrode.

[0093] For details, please refer to Figure 8 and Figure 9 The second column segment 4122 has a deformation guide hole 430 on its end face opposite to the base portion 411, which guides the column portion 412 to deform radially outward. When the pole post 400 is subjected to pressure applied along its own axial direction, the end of the pole post 400 where the deformation guide hole 430 is located can deform radially to form a head. The deformation includes bending and / or extending outward from the deformation guide hole. More specifically, the diameter of the deformation guide hole 430 gradually decreases in the direction away from the end face. For example, the deformation guide hole 430 is a tapered hole.

[0094] Specifically, the battery package top cover also includes an explosion-proof valve 500 and a dustproof sticker. A pressure relief hole penetrating the cover plate 100 is provided on the cover plate 100, the explosion-proof valve 500 is disposed within the pressure relief hole, and the dustproof sticker covers the pressure relief hole. It should be noted that both the explosion-proof valve 500 and the dustproof sticker are known in the art, and their specific structures are not limited here. Of course, the battery package top cover in this embodiment may also have other structures that enable it to achieve its basic functions; these structures are all known in the art and are not specifically limited here.

[0095] Specifically, traditional cover plates use a structure where the sealing ring and the lower insulating component are squeezed together for sealing. Because the lower insulating component is a plastic material with good elasticity, it is highly likely to deform under external force or temperature changes. This will affect the sealing effect between the sealing ring and the lower insulating component, and may even cause the seal to fail. In contrast, this utility model uses a joint sealing method involving the pole, sealing ring, and cover plate. The pole and cover plate (the insulating component in contact with the sealing ring) are both rigid parts and are not easily deformed. Only the sealing ring will deform, resulting in a better sealing effect and higher reliability.

[0096] The manufacturing process of a battery encapsulation top cover according to an embodiment of this utility model may include the following steps:

[0097] Stamping: The aluminum substrate is placed into a stamping press to form the main body of the aluminum cover plate.

[0098] Degreasing and cleaning: The main body of the manufactured cover plate is degreased and cleaned to remove surface oil and dirt.

[0099] Acid treatment: After cleaning and drying, the main body of the aluminum cover plate is subjected to acid treatment, which allows the acidic liquid to corrode the main body of the aluminum cover plate, causing nanoscale pores to appear on the surface of the main body of the cover plate.

[0100] Drying: Dry the surface moisture of the main body of the cover plate after acid treatment.

[0101] PPS Nano Injection Molding: The main body of the aluminum cover plate is placed into a nano injection mold with nano injection positions. Then, molten PPS material is injected through the injection holes in the mold and brought into close contact with the main body of the aluminum cover plate, filling the entire nano injection mold. After the injection molded part solidifies, the mold is opened, and a structure similar to an upper and lower insulating part made of PPS material is formed on the main body of the aluminum cover plate, thus obtaining the cover plate.

[0102] A current collector with integrated terminal and current collector functions is obtained by using cold heading process.

[0103] Place the sealing ring at the central through hole of the cover plate, so that the sealing ring and the central riveting hole of the cover plate are concentric circles.

[0104] The electrode post is inserted sequentially through the cover plate, sealing ring, and current collector from one side of the cover plate, and then stamped to rivet and fix the cover plate and current collector.

[0105] By assembling explosion-proof valves and other accessories on the cover plate, a new type of top cover is obtained.

[0106] This invention provides a battery encapsulation top cover that not only greatly simplifies the production process but also improves product performance. The top cover is manufactured by integrally injection molding the main body, first insulating part, and second insulating part, eliminating manual assembly costs and reducing riveting defects caused by assembly issues. Furthermore, the top cover uses PPS injection molding to integrally mold PPS material onto the surface of the main body. This PPS injection-molded structure replaces the traditional upper and lower insulating parts of the cover, improving the cover's bending strength.

[0107] This utility model provides a battery packaging top cover that adopts an integrated current collector and terminal structure, which saves equipment costs and improves product performance. Furthermore, the current collector and terminal portions in the current collector provided in this utility model embodiment are integrally formed by cold forging or rolling (the thinnest area is within 1 / 6 of the thickest area), and the insulation portion is injection molded with the cover body using PPS injection molding. This increases the cover's bending strength and elastic recovery capability, improving bending strength by 20%. Additionally, this utility model uses a compression seal for the terminal post, the cover's insulation portion, and the sealing ring; both the terminal post and the cover's insulation portion are rigid structures, ensuring high reliability.

[0108] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cover plate for a battery encapsulation top cover, characterized in that, include: The cover plate comprises a first insulating part, a cover plate main body, and a second insulating part. The cover plate main body is disposed between the first insulating part and the second insulating part. The cover plate is also provided with a first riveting hole that passes through the cover plate along its axial direction. The first insulating part and the second insulating part are integrally formed by injection molding. The cover plate main body, the first insulating part, and the second insulating part are integrated into a single injection molding process.

2. The cover plate of the battery package top cover according to claim 1, characterized in that: The main body of the cover plate is a metal structure, and the first insulating part and the second insulating part are polyphenylene sulfide structures.

3. The cover plate of the battery package top cover according to claim 1, characterized in that: All of the first riveting holes are located in the injection molding body containing the first insulating part and the second insulating part.

4. The cover plate of the battery package top cover according to claim 3, characterized in that: The second insulating part is provided with a first groove structure, a second groove structure and a third groove structure. The groove opening of the first groove structure is located on the second side of the second insulating part opposite to the first insulating part. The groove opening of the second groove structure is located at the bottom of the groove of the first groove structure. The groove opening of the third groove structure is located at the bottom of the groove of the second groove structure. The bottom of the groove of the third groove structure is in communication with the first riveting hole.

5. The cover plate of the battery package top cover according to claim 4, characterized in that: The area of ​​the radial cross section of the third groove structure gradually decreases in the direction away from the second groove structure.

6. The cover plate of the battery package top cover according to claim 4, characterized in that: The first insulating part has a fourth groove structure on its first side facing away from the second insulating part, and the bottom of the groove structure is in communication with the first riveting hole.

7. The cover plate of the battery package top cover according to claim 1, characterized in that: The cover plate is also provided with a pressure relief hole, which extends through the cover plate along its axial direction.

8. A battery encapsulation top cover, characterized in that, include: A cover plate, the cover plate including a first insulating part, a cover plate body part and a second insulating part, the cover plate body part being disposed between the first insulating part and the second insulating part, and the cover plate also having a first riveting hole, the first riveting hole penetrating the cover plate along the axial direction of the cover plate; A current collector, comprising a current collecting portion and a terminal portion, wherein the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and further wherein the terminal portion is provided with a second riveting hole; The electrode post passes through the first riveting hole and the second riveting hole, and is riveted to the cover plate and the current collector. The electrode post is insulated from the cover plate but electrically connected to the current collector. A sealing ring is disposed between the cover plate and the current collector plate. The sealing ring surrounds the pole post, and the sealing ring deforms under pressure to form a sealing fit with the pole post, the cover plate, and the current collector plate.

9. The battery encapsulation top cover according to claim 8, characterized in that: The first insulating part and the second insulating part are integrally formed by injection molding process, and the cover plate body is integrated with the first insulating part and the second insulating part by a single injection molding process.

10. The battery encapsulation top cover according to claim 9, characterized in that: The main body of the cover plate is a metal structure, and the first insulating part and the second insulating part are polyphenylene sulfide structures.

11. The battery encapsulation top cover according to claim 8, characterized in that: All of the first riveting holes are located in the injection molding body containing the first insulating part and the second insulating part.

12. The battery encapsulation top cover according to claim 11, characterized in that: The second insulating part is provided with a first groove structure, a second groove structure and a third groove structure. The groove opening of the first groove structure is located on the second side of the second insulating part opposite to the first insulating part. The groove opening of the second groove structure is located at the bottom of the groove of the first groove structure. The groove opening of the third groove structure is located at the bottom of the groove of the second groove structure. The bottom of the groove of the third groove structure is in communication with the first riveting hole. The sealing ring is disposed in the second groove structure and the third groove structure and is tightly fitted with the groove walls of the second groove structure and the third groove structure. The terminal part of the current collector is disposed in the first groove structure and is in close contact with the sealing ring.

13. The battery encapsulation top cover according to claim 12, characterized in that: The area of ​​the radial cross section of the third groove structure gradually decreases in the direction away from the second groove structure.

14. The battery encapsulation top cover according to claim 12, characterized in that: The first insulating part has a fourth groove structure on its first side facing away from the second insulating part. The bottom of the fourth groove structure is connected to the first riveting hole. The first end of the pole is disposed in the fourth groove structure. The terminal part has a fifth groove structure on its third side facing away from the cover plate. The bottom of the fifth groove structure is connected to the second riveting hole. The second end of the pole is disposed in the fifth groove structure. Either the first end or the second end of the pole is a head, or both the first end and the second end of the pole are heads.

15. The battery encapsulation top cover according to claim 14, characterized in that: The pole post includes a pole post body and a shell. The pole post body includes a base portion and a column portion extending axially from the base portion. The shell portion covers at least one end of the column portion away from the base portion. The shell portion is in electrical contact with the pole post body. The base portion is located at the first end and the shell portion is located at the second end. The abutment is formed by the deformation of the column portion and the shell portion covering the column portion after being stamped.

16. The battery encapsulation top cover according to claim 15, characterized in that: Both the pole body and the shell are metal components, and the metal reactivity of the pole body and the shell is different.

17. The battery encapsulation top cover according to claim 16, characterized in that: One of the pole body and the shell is a copper component, and the other is an aluminum component.

18. The battery encapsulation top cover according to claim 15, characterized in that: The column part includes a first column segment and a second column segment arranged sequentially along its own axial direction. The first column segment is fixedly connected to the base part. The diameter of the second column segment is smaller than the diameter of the first column segment. The shell covers the second column segment. The abutment is formed by the deformation of the second column segment and the shell.

19. The battery encapsulation top cover according to claim 18, characterized in that: The diameter of the second cylindrical segment and the entire shell is equal to the diameter of the first cylindrical segment.

20. The battery encapsulation top cover according to claim 18, characterized in that: The sealing ring surrounds and covers a portion of the housing away from the first cylindrical section.

21. The battery encapsulation top cover according to claim 8, characterized in that: The current collector and the terminal are integrally formed by cold heading or metal rolling processes.

22. The battery encapsulation top cover according to claim 14, characterized in that: The second riveting hole includes a first hole segment and a second hole segment arranged sequentially along its own axial direction. The diameter of the first hole segment is smaller than the diameter of the second hole segment, and the second hole segment serves as the fifth groove structure.

23. The battery encapsulation top cover according to claim 8, characterized in that: The terminal portion has an overall circular or square structure.

24. The battery encapsulation top cover according to claim 8, characterized in that: The thickness of the terminal portion is greater than the thickness of the current collector portion, and the connection between the terminal portion and the current collector portion has a rounded corner structure.

25. The battery encapsulation top cover according to claim 8, characterized in that: The current collector is a pure copper component or a nickel-plated copper component.

26. The battery encapsulation top cover according to claim 8, characterized in that, Also includes: An explosion-proof valve is disposed inside the cover plate.

27. The battery encapsulation top cover according to claim 26, characterized in that: The cover plate is provided with a pressure relief hole that passes through the cover plate, and the explosion-proof valve is disposed in the pressure relief hole.

28. The battery encapsulation top cover according to claim 27, characterized in that: The cover plate is also provided with a dustproof sheet, which covers the pressure relief hole.

29. A battery packaging structure, characterized in that, include: The cover plate of the battery package top cover according to any one of claims 1-7, or the battery package top cover according to any one of claims 8-28.

30. A battery casing, characterized in that, include: The battery casing and the battery encapsulation top cover as described in any one of claims 8-28, or the battery encapsulation structure as described in claim 29, wherein the battery encapsulation top cover is fixedly connected to the casing.

31. A battery, characterized in that, include: The battery core and the battery casing of claim 30, wherein the battery core is encapsulated within the battery casing, and the tabs of the battery core are electrically connected to the terminals on the top cover of the battery casing.

32. A battery module, characterized in that, It includes a plurality of batteries as described in claim 31, wherein the plurality of batteries are connected in series and / or in parallel.

Images