Cover plate, current collector, pole, battery shell, battery and battery module

Abstract

The invention discloses a cover plate, a current collector, a pole, 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 in the embodiment of the invention, the technological process in production is greatly simplified, and the product performance can also be improved.

Description

Technical Field

[0001] The present invention particularly relates to a cover plate, a current collecting sheet, a pole, a battery shell, a battery and a battery module, and belongs to the technical field of battery packaging. Background Art

[0002] At present, the battery cover structure is riveted in the traditional way, that is, the pole and the collector are welded together, and then the terminal, upper insulator, cover, sealing ring, and lower insulator are riveted together through the pole. There are two disadvantages to this method: 1) The pole and the collector are welded together. The pole material is copper, and the welding equipment used is expensive; secondly, the collector and the pole are connected together by welding, and the welding area between the collector and the pole is likely to fall off, resulting in product failure. 2) The production process is complicated, and the labor cost required for control and assembly is high.

[0003] In short, the existing cover plate manufacturing process is complicated. The battery cover plate is likely to have the phenomenon of current collector and pole falling off due to the instability of welding equipment and tooling, causing battery failure. Summary of the invention

[0004] The main purpose of the present invention is to provide a cover plate, a current collector, a pole, a battery shell, a battery and a battery module, so as to overcome the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0006] A first aspect of an embodiment of the present invention provides a cover plate for a battery packaging top cover, comprising: a first insulating part, a cover plate main body part and a second insulating part, wherein the cover plate main body part is arranged between the first insulating part and the second insulating part, and a first rivet hole is also arranged on the cover plate, wherein the first rivet hole penetrates the cover plate along the axial direction of the cover plate, the first insulating part and the second insulating part are injection molded bodies formed integrally by an injection molding process, and the cover plate main body is combined into one with the first insulating part and the second insulating part by a mosaic structure formed by one-time injection molding.

[0007] A second aspect of an embodiment of the present invention provides a current collecting plate for a battery packaging top cover, comprising: a current collecting part and a terminal part, wherein the terminal part is located at one end of the current collecting part, and the current collecting part and the terminal part are an integral structure formed by a cold heading process or a metal rolling process, and a second rivet hole is also provided on the terminal part.

[0008] A third aspect of an embodiment of the present invention provides a pole for a battery packaging top cover, comprising: a pole body and a shell sleeve, wherein the pole body comprises a base portion and a column portion extending axially from the base portion, the shell sleeve at least wraps around a portion of the column portion away from one end of the base portion, and the shell sleeve is in electrical contact with the pole body.

[0009] A fourth aspect of an embodiment of the present invention provides a battery packaging top cover, comprising:

[0010] A cover plate, the cover plate comprising a first insulating portion, a cover plate main portion and a second insulating portion, the cover plate main portion being arranged between the first insulating portion and the second insulating portion, and a first rivet hole being arranged on the cover plate, the first rivet hole penetrating the cover plate along the axial direction of the cover plate;

[0011] A current collecting sheet, the current collecting sheet comprising a current collecting portion and a terminal portion, the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and a second rivet hole is further provided on the terminal portion;

[0012] A pole, the pole passes through the first rivet hole and the second rivet hole, and is riveted to the cover plate and the current collecting sheet, and the pole is insulated from the cover plate and electrically connected to the current collecting sheet;

[0013] A sealing ring is provided between the cover plate and the current collecting sheet, the sealing ring surrounds the pole, and the sealing ring is deformed under pressure to seal with the pole, the cover plate and the current collecting sheet.

[0014] A fifth aspect of an embodiment of the present invention provides a battery packaging structure, which includes: a cover plate of the battery packaging top cover, or a current collecting sheet of the battery packaging top cover, or a pole of the battery packaging top cover, or the battery packaging top cover.

[0015] A sixth aspect of the embodiments of the present invention provides a battery shell, which includes: a shell sleeve and the battery packaging top cover, or the battery packaging structure, wherein the battery packaging top cover is fixedly combined with the shell sleeve.

[0016] A seventh aspect of the embodiments of the present invention provides a battery, comprising: a battery core and a battery shell, wherein the battery core is encapsulated in the battery shell, and the tabs of the battery core are electrically connected to the poles.

[0017] An eighth aspect of an embodiment of the present invention provides a battery module, characterized in that it comprises a plurality of batteries as described in claim 12, and the plurality of batteries are connected in series and / or in parallel.

[0018] Compared with the prior art, the advantages of the present invention include:

[0019] A battery packaging top cover in the embodiment of the present invention not only greatly simplifies the process flow in production, but also improves product performance.

[0020] A battery packaging top cover in an embodiment of the present invention is obtained by integrally injection molding a cover body, a first insulating portion, and a second insulating portion, which can save manual assembly costs and reduce poor riveting problems caused by the assembly process.

[0021] A battery packaging top cover in an embodiment of the present invention adopts a PPS injection molding process to integrally mold PPS material on the surface of the cover body. Its PPS injection molding structure replaces the upper insulating part and the lower insulating part of the traditional cover, and can also improve the bending strength of the cover.

[0022] A battery packaging top cover in an embodiment of the present invention adopts an integrated structure of a current collector and a terminal, which can save equipment costs and improve product performance. In addition, the current collector and the terminal part in the current collector provided in the embodiment of the present invention are formed in one piece by cold heading or calendering (the thinnest area is within 1 / 6 of the thickest area), and the insulating part and the main body of the cover plate are injection molded into one piece by a PPS injection molding process, which can increase the bending strength and elastic recovery ability of the cover plate, and the bending strength is increased by 20%. In addition, the present invention adopts the pole, the insulating part of the cover plate, and the sealing ring for extrusion sealing, and the insulating part of the pole and the cover plate are both rigid structures with high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 , Figure 2 It is a structural exploded diagram of a battery packaging top cover provided in a typical implementation case of the present invention;

[0025] Figure 3 It is a schematic diagram of a longitudinal cross-sectional structure of a battery packaging top cover provided in a typical implementation case of the present invention;

[0026] Figure 4 It is a schematic diagram of the longitudinal cross-sectional structure of a cover plate in a battery packaging top cover provided in a typical implementation case of the present invention;

[0027] Figure 5It is a schematic diagram of the longitudinal cross-sectional structure of a current collecting sheet of a battery packaging top cover provided in a typical implementation case of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of a pole in a battery packaging top cover provided in a typical implementation case of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the configuration of a pole and a sealing ring in a battery packaging top cover provided in a typical implementation case of the present invention;

[0030] Figure 8 , Fig. 9 It is a schematic diagram of the structure of a pole in a battery packaging top cover provided in a typical implementation case of the present invention. DETAILED DESCRIPTION

[0031] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0032] A first aspect of an embodiment of the present invention provides a cover plate for a battery packaging top cover, comprising: a first insulating part, a cover plate main body part and a second insulating part, wherein the cover plate main body part is arranged between the first insulating part and the second insulating part, and a first rivet hole is also arranged on the cover plate, wherein the first rivet hole penetrates the cover plate along the axial direction of the cover plate, the first insulating part and the second insulating part are injection molded bodies formed integrally by an injection molding process, and the cover plate main body is combined into one with the first insulating part and the second insulating part by a mosaic structure formed by one-time injection molding.

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

[0034] Furthermore, all of the first rivet holes are arranged in the injection-molded body including the first insulating part and the second insulating part.

[0035] Furthermore, a first groove-like structure, a second groove-like structure and a third groove-like structure are provided in the second insulating part, the groove of the first groove-like structure is located on the second surface of the second insulating part facing away from the first insulating part, the groove of the second groove-like structure is located at the groove bottom of the first groove-like structure, the groove of the third groove-like structure is located at the groove bottom of the second groove-like structure, and the groove bottom of the third groove-like structure is connected to the first rivet hole.

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

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

[0038] Furthermore, a pressure relief hole is provided on the cover plate, and the pressure relief hole penetrates the cover plate along the axial direction of the cover plate.

[0039] A second aspect of an embodiment of the present invention provides a current collecting plate for a battery packaging top cover, comprising: a current collecting part and a terminal part, wherein the terminal part is located at one end of the current collecting part, and the current collecting part and the terminal part are an integral structure formed by a cold heading process or a metal rolling process, and a second rivet hole is also provided on the terminal part.

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

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

[0042] Furthermore, the terminal portion is an entirety in a circular structure or a square structure.

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

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

[0045] A third aspect of an embodiment of the present invention provides a pole for a battery packaging top cover, comprising: a pole body and a shell sleeve, wherein the pole body comprises a base portion and a column portion extending axially from the base portion, the shell sleeve at least wraps around a portion of the column portion away from one end of the base portion, and the shell sleeve is in electrical contact with the pole body.

[0046] Furthermore, the pole body and the shell are both metal components, and the metal activities of the pole body and the shell are 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 column portion has a deformation guide hole on its end face facing away from the base portion for guiding the column portion to deform radially outward. When the pole is subjected to pressure applied along its own axial direction, one end portion where the deformation guide hole is located can deform radially along the pole to form a pier head, and the deformation includes bending and / or extending toward the outside of the rivet hole.

[0049] Furthermore, the diameter of the deformation guiding hole gradually decreases in a direction away from the end surface.

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

[0051] Furthermore, the column portion includes a first column segment and a second column segment arranged in sequence along its own axial direction, the first column segment is fixedly combined with the base portion, the deformation guide hole is arranged on the end face of the second column segment facing away from the first column segment, the diameter of the second column segment is smaller than the diameter of the first column segment, and the shell wraps the second column segment.

[0052] Furthermore, the diameter of the second column segment and the shell as a whole is equal to the diameter of the first column segment.

[0053] A fourth aspect of an embodiment of the present invention provides a battery packaging top cover, comprising:

[0054] A cover plate, the cover plate comprising a first insulating portion, a cover plate main portion and a second insulating portion, the cover plate main portion being arranged between the first insulating portion and the second insulating portion, and a first rivet hole being arranged on the cover plate, the first rivet hole penetrating the cover plate along the axial direction of the cover plate;

[0055] A current collecting sheet, the current collecting sheet comprising a current collecting portion and a terminal portion, the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and a second rivet hole is further provided on the terminal portion;

[0056] A pole, the pole passes through the first rivet hole and the second rivet hole, and is riveted to the cover plate and the current collecting sheet, and the pole is insulated from the cover plate and electrically connected to the current collecting sheet;

[0057] A sealing ring is provided between the cover plate and the current collecting sheet, the sealing ring surrounds the pole, and the sealing ring is deformed under pressure to seal with the pole, the cover plate and the current collecting sheet.

[0058] Furthermore, the first insulating part and the second insulating part are an injection-molded body integrally formed by an injection molding process, and the cover plate main body is integrated with the first insulating part and the second insulating part by a chimeric structure formed by one-time injection molding.

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

[0060] Furthermore, all of the first rivet holes are arranged in the injection-molded body including the first insulating part and the second insulating part.

[0061] Furthermore, a first groove-like structure, a second groove-like structure and a third groove-like structure are arranged in the second insulating part, the groove of the first groove-like structure is located on the second surface of the second insulating part facing away from the first insulating part, the groove of the second groove-like structure is located at the groove bottom of the first groove-like structure, the groove of the third groove-like structure is located at the groove bottom of the second groove-like structure, the groove bottom of the third groove-like structure is connected to the first rivet hole, the sealing ring is arranged in the second groove-like structure and the third groove-like structure, and is tightly fitted with the groove walls of the second groove-like structure and the third groove-like structure, and the terminal part of the collector is arranged in the first groove-like structure and is in close contact with the sealing ring.

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

[0063] Further, a fourth groove-shaped structure is provided on the first surface of the first insulating part facing away from the second insulating part, the groove bottom of the fourth groove-shaped structure is conductively connected to the first rivet hole, the first end of the pole is arranged in the fourth groove-shaped structure, and a fifth groove-shaped structure is provided on the third surface of the terminal part facing away from the cover plate, the groove bottom of the fifth groove-shaped structure is conductively connected to the second rivet hole, and the second end of the pole is arranged in the fifth groove-shaped structure, wherein one of the first end and the second end of the pole is a pier head, or the first end and the second end of the pole are both pier heads.

[0064] Furthermore, the pole includes a pole body and a shell, the pole body includes a base portion and a column portion extending axially from the base portion, the shell at least wraps around a portion of the column away from one end of the base portion, the shell is in electrical contact with the pole body, the base is located at the first end, the shell is located at the second end, and the pier head is formed by the deformation of the column and the shell wrapping the column after being stamped.

[0065] Furthermore, the pole body and the shell are both metal components, and the metal activities of the pole body and the shell are 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 in sequence along its own axial direction, the first column segment is fixedly combined with the base portion, the diameter of the second column segment is smaller than the diameter of the first column segment, the shell sleeve wraps the second column segment, and the pier head is formed after the second column segment and the shell sleeve are deformed.

[0068] Furthermore, the diameter of the second column segment and the shell as a whole is equal to the diameter of the first column segment.

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

[0070] Furthermore, the current collecting portion and the terminal portion are an integrated structure formed by a cold heading process or a metal rolling process.

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

[0072] Furthermore, the terminal portion is an entirety in a circular structure or a square structure.

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

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

[0075] Furthermore, the battery package top cover also includes: an explosion-proof valve, and the explosion-proof valve is arranged in the cover plate.

[0076] Furthermore, the cover plate is provided with a pressure relief hole which passes through the cover plate, and the explosion-proof valve is arranged in the pressure relief hole.

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

[0078] A fifth aspect of an embodiment of the present invention provides a battery packaging structure, which includes: a cover plate of the battery packaging top cover, or a current collecting sheet of the battery packaging top cover, or a pole of the battery packaging top cover, or the battery packaging top cover.

[0079] A sixth aspect of the embodiments of the present invention provides a battery shell, which includes: a shell sleeve and the battery packaging top cover, or the battery packaging structure, wherein the battery packaging top cover is fixedly combined with the shell sleeve.

[0080] A seventh aspect of the embodiments of the present invention provides a battery, comprising: a battery core and a battery shell, wherein the battery core is encapsulated in the battery shell, and the tabs of the battery core are electrically connected to the poles.

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

[0082] The technical solution, its implementation process and principles, etc. will be further explained below in conjunction with the accompanying drawings and specific implementation cases. Unless otherwise specified, the explosion-proof valves, dust stickers, sealing rings, etc. mentioned in the embodiments of the present invention 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 the present invention are all known in the art, and the equipment they rely on is also known in the art, and no specific limitation is made here.

[0083] See also Figure 1 and Figure 2 In a typical implementation case, a battery packaging top cover includes a cover plate 100, a current collecting sheet 200, a pole 400 and a sealing ring 300. The pole 400 passes through the cover plate 100 and the current collecting sheet 200. The cover plate 100 and the current collecting sheet 200 are riveted and fixed together by the pole 400. The sealing ring 300 is arranged between the cover plate 100 and the current collecting sheet 200, and the cover plate 100, the current collecting sheet 200 and the pole 400 are sealed and matched.

[0084] For details, please refer to Figure 2 , Figure 3 and Figure 4 The cover plate 100 includes a first insulating portion 120, a cover plate body 110, and a second insulating portion 130, wherein the cover plate body 110 is disposed between the first insulating portion 120 and the second insulating portion 130, and a first rivet hole 140 is further disposed on the cover plate 100, wherein the first rivet hole 140 continuously passes through the first insulating portion 120, the cover plate body 110, and the second insulating portion 130, and the current collecting sheet 200 includes a current collecting portion 210 and a terminal portion 220, wherein the terminal portion 220 is located at one end of the current collecting portion 210 and is electrically connected to the current collecting portion 210. The terminal portion 220 is connected, and a second rivet hole 240 is also provided on the terminal portion 220. The pole 400 passes through the first rivet hole 140 and the second rivet hole 240 and is riveted to the cover plate 100 and the current collecting sheet 200. Moreover, the pole 400 is insulated from the cover plate 100 and is electrically connected to the current collecting sheet 200. The sealing ring 300 is provided between the cover plate 100 and the current collecting sheet 200. The sealing ring 300 surrounds the pole 400. Moreover, the sealing ring 300 is deformed under pressure and is sealed with the pole 400, the cover plate 100 and the current collecting sheet 200.

[0085] For details, please refer to Figure 3 and Figure 4The cover plate body 110 is a metal structure, 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 injection molded bodies formed by an injection molding process, and the cover plate body 110 is integrated with the first insulating part 120 and the second insulating part 130 through a chimeric structure formed by one-time injection molding, wherein all of the first rivet holes 140 are arranged in the injection molded body including the first insulating part 120 and the second insulating part 130. It should be noted that the sealing ring 300 is specifically arranged between the second insulating part 130, the current collecting sheet 200 and the pole 400, and the sealing ring 300 is directly in contact with the second insulating part 130.

[0086] Specifically, the cover plate 100 is formed by first placing the cover plate body 110 in an injection mold, then injecting PPS into the mold, and cooling it to form a PPS injection molded cover plate. The cover plate body 110, the first insulating part 120 and the second insulating part 130 are injection molded into one piece using a PPS injection molding process. On the one hand, the cover plate 100 obtained by PPS injection molding can greatly reduce the number of parts. Secondly, the material of the injection molded cover plate 100, the first insulating part 120 and the second insulating part 130 is PPS, which is a harder material. After injection molding, the overall strength of the cover plate 100 will be increased. In this way, after riveting with 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, the present invention adopts the injection molding process to integrally form the metal part serving as the main body of the cover plate and the first insulating part and the second insulating part. Compared with the traditional cover plate, the cover plate in the embodiment of the present invention has better bending resistance and good elasticity. When subjected to external extrusion, the deformation is small. The traditional aluminum cover plate is a rigid structure and undergoes plastic deformation when subjected to external force and has no ability to recover to its original state.

[0087] Specifically, the second insulating portion 130 is provided with a first groove-like structure 131, a second groove-like structure 132 and a third groove-like structure 133, the notch of the first groove-like structure 131 is located at the second surface of the second insulating portion 130 facing away from the first insulating portion 120, the notch of the second groove-like structure 132 is located at the groove bottom of the first groove-like structure 131, the notch of the third groove-like structure 133 is located at the groove bottom of the second groove-like structure 132, the groove bottom of the third groove-like structure 133 is connected to the first rivet hole 140, the sealing ring 300 is arranged in the second groove-like structure 132 and the third groove-like structure 133, and is tightly fitted with the groove walls of the second groove-like structure 132 and the third groove-like structure 133, and the terminal portion 220 of the current collecting sheet 200 is arranged at the first The first insulating part 120 is provided with a fourth groove structure 121 on the first surface facing away from the second insulating part 130, and the groove bottom of the fourth groove structure 121 is in conduction with the first rivet hole 140. The first end of the pole 400 is arranged in the fourth groove structure 121. The terminal part 220 is provided with a fifth groove structure 221 on the third surface facing away from the cover plate 100, and the groove bottom of the fifth groove structure 221 is in conduction with the second rivet hole 240. The second end of the pole 400 is arranged in the fifth groove structure 221, wherein one of the first end and the second end of the pole 400 is a pier head 440, or both the first end and the second end of the pole 400 are pier heads 440. It can be understood that the pier head at one end of the pole 400 is larger in size, and the pier head 440 is formed by the deformation of one end of the pole 400 in the radial direction due to the pressure applied along its own axial direction.

[0088] It should be noted that the shape of the first insulating portion 120 in the present embodiment may be circular, rectangular, diamond-shaped, etc., but is not limited thereto. Similarly, the contour shape of the sealing ring 300 in the present embodiment may be circular, rectangular, etc. Similarly, the contour shapes of the pole 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 may also be selected according to specific needs, and no specific limitation is made here. In addition, 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 may be designed according to specific circumstances, and no specific limitation is made here.

[0089] Specifically, the sealing ring 300 is an annular structure, and the outer ring surface of the sealing ring 300 may have a step structure, that is, the outer ring surface of the sealing ring 300 is a step surface, and the step structure on the sealing ring 300 is adapted to the step structure between the second groove structure 132 and the third groove structure 133. When the sealing ring 300 is squeezed and deformed, the sealing ring 300 can be in close contact with the groove wall of the second groove structure 132 and the third groove structure 133 to maintain sealing. The step structure of the sealing ring 300 can increase the contact area with the cover plate 100 and improve the sealing effect. In order to further improve the sealing effect of the sealing ring 300, the area of ​​the radial cross section of the third groove structure 133 gradually decreases in the direction away from the second groove structure 132. Through such a design, the deformation of the sealing ring 300 when subjected to the same pressure can be more sufficient, so that it can be in closer contact with the cover plate 100. Exemplarily, the contour shape of the third groove structure 133 can be a truncated cone structure, etc. Exemplarily, the sealing ring 300 can be a rubber ring, etc.

[0090] For details, please refer to Figure 5 The current collecting part 210 and the terminal part 220 are an integral structure formed by a cold heading process or a metal rolling process. Specifically, the radial width of the fourth groove-shaped structure 121 is greater than the radial width of the second rivet hole 240. The second rivet hole 240 can be passed through by the pole 400. The fourth groove-shaped structure 121 can be turned over to form a pier head for the pole 400, thereby ensuring the riveting strength of the pole 400. Specifically, the thickness of the terminal part 220 is greater than the thickness of the current collecting part 210, and the connection between the terminal part 220 and the current collecting part 210 has a rounded structure. It should be noted that the current collecting part 210 is also provided with other structures that enable it to realize its own current collecting function. These structures are all structures known in the art and are not specifically limited here. Specifically, the current collecting sheet 200 is a processed part formed in one piece by a cold heading process or a metal rolling process, specifically a metal part, for example, a pure copper component or a nickel-plated copper component, and the specific cold heading process is not specifically limited. It should be noted that the fourth groove-like structure 121 and the second rivet hole 240 can be integrated, and the second rivet hole includes a first hole segment and a second hole segment arranged in sequence along its own axial direction, the hole diameter of the first hole segment is smaller than the hole diameter of the second hole segment, and the second hole segment serves as the fifth groove-like structure.

[0091] For details, please refer to Figure 3 , Figure 6-Figure 9The pole 400 includes a pole body 410 and a shell 420. The pole 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 in sequence along its own axial direction. The first column segment 4121 is fixedly combined with 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 wraps the second column segment 4121. The body section 4122, the sealing ring 300 surrounds and covers a portion of the shell 420 away from the first column section 4121. It can be understood that both ends of the shell 420 are exposed outside the sealing area of ​​the sealing ring 300. The base 411 of the pole 400 can be used as a pier head. The other pier head of the pole 400 is formed by the second column section 4122 of the column section 412 and the shell 420 wrapping the second column section 4122 after stamping. The deformation includes bending and / or stretching outward along the radial direction of the pole 400. It should be noted that the first end of the pole 400 is the end where the base 411 is located, and the second end is the end where the shell 420 is located.

[0092] Specifically, the pole body 410 and the shell 420 are both metal components, and the metal activity of the pole body 410 and the shell 420 is different. More specifically, one of the pole body 410 and the shell 420 is a copper component, and the other is an aluminum component. Compared with the pure copper pole, the pole provided by the embodiment of the present invention is formed by a composite of copper and aluminum, and its price is lower. When the battery package top cover is used as the negative electrode top cover, the copper shell is in contact with the electrolyte, which can avoid chemical reaction with the electrolyte (aluminum metal is relatively active in chemical properties, positively charged, and easily reacts chemically with negatively charged electrolytes). In this embodiment, after riveting, the distance L1 from the copper shell 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 squeezing the sealing ring 300 and the pole 400, and the electrolyte will not contact the aluminum structure of the pole.

[0093] For details, please refer to Figure 8 and Fig. 9 The second column segment 4122 has a deformation guide hole 430 on the end surface facing away from the base portion 411 for guiding the column portion 412 to deform outwardly along its own radial direction. When the pole 400 is subjected to pressure applied along its own axial direction, one end portion where the deformation guide hole 430 is located can deform along the radial direction of the pole 400 to form a pier head, and the deformation includes bending and / or extending toward the outside of the rivet hole. More specifically, the diameter of the deformation guide hole 430 gradually decreases in the direction away from the end surface. Exemplarily, 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. The cover plate 100 is provided with a pressure relief hole that passes through the cover plate 100. The explosion-proof valve 500 is arranged in the pressure relief hole, and the dustproof sticker covers the pressure relief hole. It should be noted that the explosion-proof valve 500 and the dustproof sticker are both known in the art, and their specific structures are not limited here. Of course, the battery package top cover in this embodiment also has other structures that enable it to realize its basic functions. These structures are all known in the art and are not specifically limited here.

[0095] Specifically, the traditional cover plate adopts a structure in which the sealing ring and the lower insulating part are squeezed and sealed. Because the lower insulating part is made of plastic material and has good elasticity, when it is subjected to external force or temperature changes, it is likely to cause the lower insulating part to deform, which will affect the sealing effect between the sealing ring and the lower insulating part and may cause the seal to fail. The present invention uses the pole, the sealing ring and the cover plate to seal together. The pole and the cover plate (the insulating part in contact with the sealing ring) are both rigid parts and are not easy to deform. Only the sealing ring will deform, so the sealing effect will be better and the reliability will be high.

[0096] A manufacturing process of a battery package top cover in an embodiment of the present invention may include the following steps:

[0097] Stamping: The aluminum substrate is placed in a punch press to form an aluminum cover body.

[0098] Degreasing and cleaning: Degrease and clean the main body of the finished cover to remove surface oil stains.

[0099] Acid treatment: The cleaned and dried aluminum cover plate body is subjected to acid treatment, and the acidic liquid is allowed to corrode the aluminum cover plate body, so that nano-scale holes appear on the surface of the cover plate body.

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

[0101] PPS nano-injection molding: The main body of the aluminum cover is placed in a nano-injection molding mold, on which a nano-injection molding position is provided. Afterwards, the molten PPS material is brought into close contact with the main body of the aluminum cover through the injection molding holes provided on the mold, and fills the entire nano-injection molding mold. After the injection molded part solidifies, the mold is opened, and a structure similar to an upper insulating part and a lower insulating part made of PPS material is formed on the main body of the aluminum cover, thereby obtaining the cover.

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

[0103] The sealing ring is placed at the middle through hole of the cover plate so that the sealing ring and the middle riveting hole of the cover plate are concentric circles.

[0104] The pole is passed through the cover plate, the sealing ring and the current collecting sheet in sequence from one side of the cover plate, and the pole is punched so that the cover plate and the current collecting sheet are riveted and fixed.

[0105] The explosion-proof valve and other accessories are assembled on the cover plate to obtain a new type of top cover.

[0106] A battery packaging top cover in an embodiment of the present invention not only greatly simplifies the process flow in production, but also improves product performance. A battery packaging top cover in an embodiment of the present invention adopts a method of integrally injecting and molding a cover plate main body, a first insulating part, and a second insulating part to obtain a cover plate, which can not only save the cost of manual assembly, but also reduce the problem of poor riveting caused by the assembly process. A battery packaging top cover in an embodiment of the present invention adopts a PPS injection molding process to integrally inject and mold PPS material on the surface of the cover plate main body. Its PPS injection molding structure replaces the upper insulating part and the lower insulating part of the traditional cover plate, and can also improve the bending strength of the cover plate.

[0107] A battery packaging top cover in an embodiment of the present invention adopts an integrated structure of a current collector and a terminal, which can save equipment costs and improve product performance. In addition, the current collector and the terminal part in the current collector provided in the embodiment of the present invention are formed in one piece by cold heading or calendering (the thinnest area is within 1 / 6 of the thickest area), and the insulating part and the main body of the cover plate are injection molded into one piece by a PPS injection molding process, which can increase the bending strength and elastic recovery ability of the cover plate, and the bending strength is increased by 20%. In addition, the present invention adopts the pole, the insulating part of the cover plate, and the sealing ring for extrusion sealing, and the insulating part of the pole and the cover plate are both rigid structures with high reliability.

[0108] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate for a battery packaging top cover, characterized in that: include: A first insulating part, a cover plate main body and a second insulating part, the cover plate main body is arranged between the first insulating part and the second insulating part, and a first rivet hole is also arranged on the cover plate, the first rivet hole penetrates the cover plate along the axial direction of the cover plate, the first insulating part and the second insulating part are injection molded bodies formed integrally by an injection molding process, and the cover plate main body is combined into one with the first insulating part and the second insulating part by a chimeric structure formed by one-time injection molding.

2. The cover plate of the battery packaging 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; And / or, all of the first rivet holes are arranged in the injection molded body including the first insulating part and the second insulating part; And / or, a first groove-shaped structure, a second groove-shaped structure and a third groove-shaped structure are provided in the second insulating portion, the groove opening of the first groove-shaped structure is located on the second surface of the second insulating portion facing away from the first insulating portion, the groove opening of the second groove-shaped structure is located on the groove bottom of the first groove-shaped structure, the groove opening of the third groove-shaped structure is located on the groove bottom of the second groove-shaped structure, and the groove bottom of the third groove-shaped structure is in conduction with the first rivet hole; and / or, the area of ​​the radial cross section of the third groove-shaped structure gradually decreases in a direction away from the second groove-shaped structure; And / or, a fourth groove-shaped structure is provided on a first surface of the first insulating portion facing away from the second insulating portion, and a groove bottom of the fourth groove-shaped structure is in conduction with the first riveting hole; And / or, the cover plate is further provided with a pressure relief hole, and the pressure relief hole penetrates the cover plate along the axial direction of the cover plate.

3. A current collector for a battery packaging top cover, characterized in that: include: The current collecting part and the terminal part are provided, wherein the terminal part is located at one end of the current collecting part, the current collecting part and the terminal part are an integral structure formed by a cold heading process or a metal rolling process, and a second rivet hole is also provided on the terminal part.

4. The current collector of the battery package top cover according to claim 3, characterized in that: The current collecting piece is a cold-forging workpiece integrally formed by a cold-forging process, or the current collecting piece is a rolled part formed by metal rolling; And / or, the second riveting hole comprises a first hole segment and a second hole segment sequentially arranged along its axial direction, and the hole diameter of the first hole segment is smaller than the hole diameter of the second hole segment; And / or, the terminal portion is a circular structure or a square structure as a whole; And / or, the thickness of the terminal portion is greater than the thickness of the current collecting portion, and the connection between the terminal portion and the current collecting portion has a rounded structure; And / or, the current collecting sheet is a pure copper component or a nickel-plated copper component.

5. A battery packaging top cover pole, characterized in that: include: A pole body and a shell, wherein the pole body comprises a base portion and a column portion extending axially from the base portion, and the shell at least wraps a portion of the column portion away from one end of the base portion, and the shell is in electrical contact with the pole body.

6. The electrode of the battery package top cover according to claim 5, characterized in that: The pole body and the shell are both metal components, and the metal activities of the pole body and the shell are different; and / or one of the pole body and the shell is a copper component and the other is an aluminum component; And / or, the end surface of the column portion facing away from the base portion has a deformation guide hole for guiding the column portion to deform outwardly in its own radial direction, and when the pole is subjected to pressure applied in its own axial direction, one end portion where the deformation guide hole is located can deform in the radial direction of the pole to form a pier head, and the deformation includes bending and / or extending toward the outside of the rivet hole; And / or, the diameter of the deformation guiding hole gradually decreases in a direction away from the end surface; And / or, the deformation guiding hole is a tapered hole; And / or, the column portion comprises a first column segment and a second column segment sequentially arranged along its own axial direction, the first column segment is fixedly combined with the base portion, the deformation guide hole is arranged on the end surface of the second column segment facing away from the first column segment, the diameter of the second column segment is smaller than the diameter of the first column segment, and the shell wraps the second column segment; Preferably, the diameter of the second column segment and the shell as a whole is equal to the diameter of the first column segment.

7. A battery packaging top cover, characterized in that: include: A cover plate, the cover plate comprising a first insulating portion, a cover plate main portion and a second insulating portion, the cover plate main portion being arranged between the first insulating portion and the second insulating portion, and a first rivet hole being arranged on the cover plate, the first rivet hole penetrating the cover plate along the axial direction of the cover plate; A current collecting sheet, the current collecting sheet comprising a current collecting portion and a terminal portion, the terminal portion is located at one end of the current collecting portion and is electrically connected to the current collecting portion, and a second rivet hole is further provided on the terminal portion; A pole, the pole passes through the first rivet hole and the second rivet hole, and is riveted to the cover plate and the current collecting sheet, and the pole is insulated from the cover plate and electrically connected to the current collecting sheet; A sealing ring is provided between the cover plate and the current collecting sheet, the sealing ring surrounds the pole, and the sealing ring is deformed under pressure to seal with the pole, the cover plate and the current collecting sheet.

8. The battery packaging top cover according to claim 7, characterized in that: The first insulating part and the second insulating part are an injection-molded body formed as a whole by an injection molding process, and the cover plate main body is integrated with the first insulating part and the second insulating part by a chimeric structure formed by one injection molding; And / or, the cover plate main body is a metal structure, and the first insulating part and the second insulating part are polyphenylene sulfide structures; And / or, all of the first rivet holes are arranged in the injection molded body including the first insulating part and the second insulating part; And / or, a first groove-like structure, a second groove-like structure and a third groove-like structure are provided in the second insulating part, the notch of the first groove-like structure is located on the second surface of the second insulating part facing away from the first insulating part, the notch of the second groove-like structure is located at the groove bottom of the first groove-like structure, the notch of the third groove-like structure is located at the groove bottom of the second groove-like structure, the groove bottom of the third groove-like structure is connected to the first riveting hole, the sealing ring is provided in the second groove-like structure and the third groove-like structure, and is tightly fitted with the groove walls of the second groove-like structure and the third groove-like structure, and the terminal portion of the current collecting sheet is provided in the first groove-like structure, and is in close contact with the sealing ring; and / or, the area of ​​the radial cross section of the third groove-shaped structure gradually decreases in a direction away from the second groove-shaped structure; And / or, a fourth groove-shaped structure is provided on a first surface of the first insulating portion facing away from the second insulating portion, a groove bottom of the fourth groove-shaped structure is in conduction with the first rivet hole, a first end of the pole is provided in the fourth groove-shaped structure, a fifth groove-shaped structure is provided on a third surface of the terminal portion facing away from the cover plate, a groove bottom of the fifth groove-shaped structure is in conduction with the second rivet hole, a second end of the pole is provided in the fifth groove-shaped structure, wherein one of the first end and the second end of the pole is a pier head, or both the first end and the second end of the pole are pier heads; And / or, the pole comprises a pole body and a shell, the pole body comprises a base portion and a column portion extending from the base portion along its own axial direction, the shell at least wraps around a portion of the column away from one end of the base, the shell is in electrical contact with the pole body, the base is located at the first end, the shell is located at the second end, and the pier head is formed by the column and the shell wrapping the column being deformed after being stamped; And / or, the pole body and the shell are both metal components, and the metal activities of the pole body and the shell are different; and / or, one of the pole body and the shell is a copper component, and the other is an aluminum component; And / or, the column portion comprises a first column segment and a second column segment sequentially arranged along its own axial direction, the first column segment is fixedly combined with the base portion, the diameter of the second column segment is smaller than the diameter of the first column segment, the shell sleeve wraps the second column segment, and the pier head is formed by deformation of the second column segment and the shell sleeve; Preferably, the diameter of the second column segment and the shell as a whole is equal to the diameter of the first column segment; Preferably, the sealing ring surrounds and covers a portion of the shell away from the first column segment; And / or, the current collecting portion and the terminal portion are an integrated structure formed by a cold heading process or a metal rolling process; And / or, the second riveting hole comprises a first hole segment and a second hole segment sequentially arranged along its own axial direction, the hole diameter of the first hole segment is smaller than the hole diameter of the second hole segment, and the second hole segment serves as the fifth groove-shaped structure; And / or, the terminal portion is a circular structure or a square structure as a whole; And / or, the thickness of the terminal portion is greater than the thickness of the current collecting portion, and the connection between the terminal portion and the current collecting portion has a rounded structure; And / or, the current collecting sheet is a pure copper component or a nickel-plated copper component.

9. The battery packaging top cover according to claim 7, characterized in that: Also includes: An explosion-proof valve, wherein the explosion-proof valve is arranged in the cover plate; And / or, the cover plate is provided with a pressure relief hole penetrating the cover plate, and the explosion-proof valve is arranged in the pressure relief hole; And / or, a dustproof sheet is further provided on the cover plate, and the dustproof sheet covers the pressure relief hole.

10. A battery packaging structure, characterized in that: include: The cover plate of the battery package top cover according to claim 1 or 2, or the current collector of the battery package top cover according to claim 3 or 4, or the pole of the battery package top cover according to claim 5 or 6, or the battery package top cover according to claim 7 or 8 or 9.

11. A battery case, characterized in that: include: The shell and the battery packaging top cover as described in claim 7, 8 or 9, or the battery packaging structure as described in claim 10, wherein the battery packaging top cover is fixedly combined with the shell.

12. A battery, characterized in that: include: A battery core and a battery shell as claimed in claim 11, wherein the battery core is encapsulated in the battery shell, and the pole ears of the battery core are electrically connected to the poles on the top cover of the battery package.

13. A battery module, characterized in that: The method comprises a plurality of batteries as claimed in claim 12, wherein the plurality of batteries are connected in series and / or in parallel.

Images