Collector piece, battery packaging top cover, battery shell and battery

Abstract

The utility model discloses a collector plate, a battery packaging top cover, a battery shell and a battery. The current collecting piece is provided with a current collecting part and a terminal part which are integrally formed, the terminal part is located at one end of the current collecting part, the current collecting part is electrically connected with the terminal part, the thickness of the terminal part is larger than that of the current collecting part, and the connecting position between the current collecting part and the terminal part is of a chamfer connecting structure in smooth transition. The terminal part is provided with a riveting hole penetrating through the terminal part, and the riveting hole is matched with the pole to form a riveting structure. Besides the functions of a traditional collector piece, the collector piece also has the function of riveting with the pole to fasten other components of the cover plate, the equipment cost can be saved, the product performance can be improved, and the collector piece is riveted with the cover plate as a riveting structure, so that the number of parts of the top cover is further reduced, the assembly process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] This utility model specifically relates to a current collector, a battery encapsulation top cover, a battery casing, and a battery, belonging to the field of battery encapsulation 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 via 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 current collector, a battery encapsulation top cover, a battery casing, and a battery, 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 current collector having an integrally formed current collecting portion and a terminal portion. The terminal portion is located at one end of the current collecting portion, and the current collecting portion and the terminal portion are electrically connected. The thickness of the terminal portion is greater than the thickness of the current collecting portion. The connection between the current collecting portion and the terminal portion is a chamfered connection structure with a smooth transition. The terminal portion has a through-hole for riveting, and the riveting hole cooperates with the pole to form a riveting structure.

[0007] A second aspect of this utility model provides a current collector having an integrally formed current collecting portion and a pole portion, wherein the pole portion is electrically connected to the current collecting portion and the pole portion can be riveted to a riveting hole located on a cover plate to form a riveting structure.

[0008] A third aspect of this utility model provides a battery packaging top cover, which includes a cover plate, a sealing ring, a terminal post, and the current collector plate. The cover plate and the terminal portion of the current collector plate are riveted and fixed by the terminal post. The sealing ring is disposed between the cover plate and the terminal portion of the current collector plate and is in sealing cooperation with the terminal portion of the cover plate and the current collector plate.

[0009] Alternatively, the battery package top cover includes a cover plate, a sealing ring, and the current collector plate. The current collector plate is riveted to the cover plate via its own terminal portion. The sealing ring is sleeved on the terminal portion and located between the current collector portion and the cover plate. The sealing ring is in a sealing fit with the current collector portion and the cover plate.

[0010] A fourth aspect of this utility model provides a battery casing, which includes: a housing and a battery encapsulation top cover, wherein the battery encapsulation top cover is fixedly connected to the housing, and the current collector is located inside the battery casing.

[0011] A fifth 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 terminal portions of current collectors on the top cover of the battery casing.

[0012] Compared with the prior art, the advantages of this utility model include:

[0013] One embodiment of this utility model features a current collector and an integrated electrode structure, which can save equipment costs and improve product performance.

[0014] This invention sets the electrode post of the current collector as a columnar structure, which also serves as a riveting structure to be riveted to the cover plate, thereby further reducing the number of parts in the top cover, simplifying the assembly process, and reducing production costs. At the same time, the electrode post adopts an inverted riveting structure to be riveted to the cover plate, which can solve the problem of easy oxidation of the electrode post. When welding connecting pieces to the terminals, it is easy to weld to the copper surface, which can easily cause solder blasting. The inverted riveting structure of the electrode post can avoid this phenomenon. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of a current collector provided in Embodiment 1 of this utility model;

[0017] Figure 2 This is a schematic diagram of another current collector provided in Embodiment 2 of this utility model;

[0018] Figure 3 This is a side view of another current collector provided in Embodiment 2 of this utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of a battery encapsulation top cover provided in Embodiment 3 of this utility model;

[0020] Figure 5 This is a longitudinal cross-sectional view of a battery encapsulation top cover provided in Embodiment 3 of this utility model. Detailed Implementation

[0021] 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.

[0022] The first aspect of this utility model provides a current collector having an integrally formed current collecting portion and a terminal portion. The terminal portion is located at one end of the current collecting portion, and the current collecting portion and the terminal portion are electrically connected. The thickness of the terminal portion is greater than the thickness of the current collecting portion. The connection between the current collecting portion and the terminal portion is a chamfered connection structure with a smooth transition. The terminal portion has a through-hole for riveting, and the riveting hole cooperates with the pole to form a riveting structure.

[0023] Furthermore, the thickness ratio of the terminal portion to the current collecting portion is (1-3)∶(0.1-0.3).

[0024] Furthermore, the thickness ratio of the terminal portion to the current collecting portion is less than or equal to 6:1.

[0025] Furthermore, the thickness of the terminal portion is 1mm-3mm, and the thickness of the current collector portion is 0.1mm-0.3mm.

[0026] Furthermore, the lower surfaces of the current collector and the terminal are located in the same plane, and the upper surfaces of the current collector and the terminal have the chamfered connection structure.

[0027] Furthermore, the radius of curvature of the chamfered connection structure is within 2mm.

[0028] Furthermore, the current collector is a cold-forged part integrally formed by a cold forging process.

[0029] A second aspect of this utility model provides a current collector having an integrally formed current collecting portion and a pole portion, wherein the pole portion is electrically connected to the current collecting portion and the pole portion can be riveted to a riveting hole located on a cover plate to form a riveting structure.

[0030] Furthermore, the end of the pole facing away from the current collector has a deformation guide hole. When the pole is subjected to pressure applied along its own axial direction, the portion of the pole surrounding the deformation guide hole can deform radially to form a head. The deformation includes bending and / or extending radially outward along the pole.

[0031] Furthermore, the diameter of the deformation guide hole gradually decreases along the direction toward the flow collection section.

[0032] Furthermore, the deformation guide hole is a tapered hole.

[0033] Furthermore, the outer peripheral surface of the pole portion has a stepped structure.

[0034] Furthermore, the pole section has a columnar structure and is arranged perpendicularly to the current collecting section.

[0035] Furthermore, the current collector is a cold-forged part integrally formed by a cold forging process.

[0036] A third aspect of this utility model provides a battery packaging top cover, which includes a cover plate, a sealing ring, a terminal post, and the current collector plate. The cover plate and the terminal portion of the current collector plate are riveted and fixed by the terminal post. The sealing ring is disposed between the cover plate and the terminal portion of the current collector plate and is in sealing cooperation with the terminal portion of the cover plate and the current collector plate.

[0037] Alternatively, the battery package top cover includes a cover plate, a sealing ring, and the current collector plate. The current collector plate is riveted to the cover plate via its own terminal portion. The sealing ring is sleeved on the terminal portion and located between the current collector portion and the cover plate. The sealing ring is in a sealing fit with the current collector portion and the cover plate.

[0038] In a more specific implementation, the battery package top cover further includes an explosion-proof valve disposed within the cover plate.

[0039] 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.

[0040] Furthermore, a dustproof sheet is also provided on the cover plate, which covers the pressure relief hole.

[0041] A fourth aspect of this utility model provides a battery casing, which includes: a housing and a battery encapsulation top cover, wherein the battery encapsulation top cover is fixedly connected to the housing, and the current collector is located inside the battery casing.

[0042] A fifth 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 terminal portions of current collectors on the top cover of the battery casing.

[0043] 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.

[0044] Example 1

[0045] Please see Figure 1 A current collector has an integrally formed current collector 210 and a terminal portion 230. The terminal portion 230 is located at one end of the current collector 210. The current collector 210 and the terminal portion 230 are electrically connected. The thickness of the terminal portion 230 is greater than the thickness of the current collector 210. The connection between the current collector 210 and the terminal portion 230 is a chamfered connection structure 250 with a smooth transition. The terminal portion 230 has a through-hole rivet hole 240, which cooperates with the pole to form a rivet structure.

[0046] Specifically, the lower surfaces of the current collector 210 and the terminal portion 230 are located in the same plane, and a chamfered connection structure 250 is provided between the upper surfaces of the current collector 210 and the terminal portion 230. More specifically, the thickness ratio of the terminal portion 230 to the current collector 210 is (1-3):(0.1-0.3). Preferably, the thickness ratio of the terminal portion 230 to the current collector 210 is less than or equal to 6:1. For example, the thickness of the terminal portion 230 is 1mm-3mm, and the thickness of the current collector 210 is 0.1mm-0.3mm. Specifically, the radius of curvature of the chamfered connection structure is within 2mm.

[0047] Specifically, the current collector is a cold-forged part formed in one piece by a cold forging process. For example, the current collector is a pure copper component or a nickel-plated copper component.

[0048] 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 all known in the art and are not specifically limited here. Specifically, the cold heading process used to form the current collector plate can be known in the art and is not specifically limited here.

[0049] Example 2

[0050] Please see Figure 2 and Figure 3A current collector has an integrally formed current collecting part 210 and a pole part 220. The pole part 220 is electrically connected to the current collecting part 210 and can be riveted to a riveting hole located on a cover plate to form a riveting structure.

[0051] Specifically, the end of the pole post 220 facing away from the current collector 210 has a deformation guide hole. When the pole post 220 is subjected to pressure applied along its own axial direction, the portion of the pole post 220 surrounding the deformation guide hole can deform radially to form a head. The deformation includes bending and / or extending radially outward along the pole post 220. More specifically, the diameter of the deformation guide hole gradually decreases in the direction toward the current collector 210. For example, the deformation guide hole is a tapered hole.

[0052] For more details, please refer to the following document. Figure 2 and Figure 3 The pole post 220 has a columnar structure and is arranged perpendicularly to the current collector 210. The outer peripheral surface of the pole post 220 has a stepped structure.

[0053] Specifically, the current collector is a cold-forged component formed integrally through a cold-forging process. For example, the current collector is a pure copper component or a nickel-plated copper component.

[0054] 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 all known in the art and are not specifically limited here. Specifically, the cold heading process used to form the current collector plate can be known in the art and is not specifically limited here.

[0055] Example 3

[0056] Please see Figure 4 and Figure 5 A battery encapsulation top cover includes a cover plate 100, a current collector (the current collector is the current collector in Example 2) 200, and a sealing ring 300. The cover plate 100 and the current collector 200 are riveted and fixed together. The sealing ring 300 is disposed between the cover plate 100 and the current collector 200, and the cover plate 100, the sealing ring 300, and the current collector 200 are sealed together.

[0057] Specifically, the cover plate 100 is provided with a first riveting hole 140 penetrating through itself. The current collector 200 includes a current collector portion 210 and a pole portion 220. The pole portion 220 is electrically connected to the current collector portion 210. The pole portion 220 has a columnar structure, with one end passing through the first riveting hole 140 and having a stamped head that is riveted and fixed to the cover plate 100. It should be noted that the pole portion 220 is electrically isolated from the cover plate 100, and the radial cross-sectional area of ​​the head is larger than the radial cross-sectional area of ​​the first riveting hole 140. Specifically, the sealing ring 300 surrounds the pole portion 220, and the sealing ring 300 deforms under pressure to form a sealing fit with the cover plate 100, the current collector portion 210 of the current collector 200, and the pole portion 220.

[0058] Specifically, a deformation guide hole is provided on the end face of the pole post 220 opposite to the current collector 210. The deformation guide hole is configured such that when the pole post 220 is subjected to pressure applied along its own axial direction, the portion of the pole post 220 surrounding the deformation guide hole can deform radially to form a head. The deformation includes bending and / or extending radially outward from the deformation guide hole. Specifically, the inner diameter of the riveting hole gradually increases in the direction away from the bottom of the riveting hole. For example, the riveting hole can be a tapered hole, etc. The specific depth and other dimensions of the riveting hole can be selected based on experience and are not specifically limited here. Specifically, the diameter of the deformation guide hole gradually decreases in the direction towards the current collector 210. For example, the deformation guide hole is a tapered hole.

[0059] Specifically, the cover plate 100 includes a first insulating part 120, a cover plate main body 110, and a second insulating part 130. The cover plate main body 110 is disposed between the first insulating part 120 and the second insulating part 130. The first riveting hole 140 continuously penetrates the first insulating part 120, the cover plate main body 110, and the second insulating part 130. Specifically, the cover plate main body 110 is a metal structure, and the first insulating part 120 and the second insulating part 130 are polyphenylene sulfide structures. The first insulating part 120 and the second insulating part 130 are integrally formed by injection molding. The cover plate main body 110 is integrated with the first insulating part 120 and the second insulating part 130 through a one-time injection molding interlocking structure. 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 disposed between the second insulating part 130, the current collector 200 and the riveting part 400, and the sealing ring 300 is in direct contact with the second insulating part 130.

[0060] For details, please refer to the following document again. Figure 4 and Figure 5The battery package top cover includes a connecting terminal 400, which has a second riveting hole penetrating through it. The connecting terminal 400 is disposed on the side of the cover plate 100 opposite to the current collector 200. The middle portion of the terminal post 220 is disposed within the second riveting hole. The head of the terminal post 220 is located on the side of the connecting terminal 400 opposite to the cover plate 100, or the head of the terminal post 220 is embedded inside the connecting terminal 400. The cover plate 100, the connecting terminal 400, and the current collector 200 are riveted together. More specifically, the second riveting hole includes a first hole segment and a second hole segment arranged sequentially in a direction away from the cover plate. The diameter of the second hole segment is larger than that of the first hole segment, and the head of the terminal post is located within the second hole segment. Understandably, before the cover plate 100, the collector plate 200, and the connecting terminal 400 are riveted and fixed, one end of the pole post 220 passes through the cover plate 100, the sealing ring 300, the cover plate 100, and the connecting terminal 400. The end of the pole post 220 away from the collector plate 210 extends into the second hole section of the second riveting hole or extends out of the second hole section. When the pole post 220 is deformed by the pressure applied along its own axial direction, the diameter of the second hole section is greater than the diameter of the first hole section. The pole post 220 bends and / or deforms radially along the second hole end to form a head.

[0061] Specifically, the cover plate 100 has a pressure relief hole penetrating through it, an explosion-proof valve is disposed within the pressure relief hole, and a dustproof sticker covers the pressure relief hole. It should be noted that both the explosion-proof valve and the dustproof sticker are known in the art, and their specific structures are not limited here. Of course, the battery encapsulation 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.

[0062] Example 4

[0063] A battery packaging top cover in this embodiment includes a cover plate 100, a current collector (the current collector is the current collector in embodiment 1) 200, a terminal post, and a sealing ring 300. The cover plate 100 and the current collector 200 are riveted together by the terminal post. The sealing ring 300 is disposed between the cover plate 100 and the current collector 200, and the cover plate 100, the sealing ring 300, and the current collector 200 are sealed together.

[0064] The structure of the cover plate 100 and the sealing ring in this embodiment is similar to that in embodiment 3, and no specific limitations are made here.

[0065] One embodiment of this utility model features a current collector and an integrated electrode post structure, which saves equipment costs and improves product performance. Furthermore, the electrode post portion of the current collector is designed as a columnar structure, which also serves as a riveting structure for riveting to the cover plate. This further reduces the number of parts in the top cover, simplifies the assembly process, and lowers production costs. Additionally, the inverted riveting structure used for the electrode post to rivet to the cover plate solves the problem of easy oxidation of the electrode post. When welding connecting pieces to the terminals, it is easy to weld to the copper surface, which can lead to solder blasting. The inverted riveting structure of the electrode post avoids this phenomenon.

[0066] 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 of the cover plate with the first and second insulating parts, eliminating manual assembly costs and reducing riveting defects caused by assembly issues. Specifically, the top cover uses PPS injection molding to integrally mold PPS material onto the surface of the main body of the cover plate. This PPS injection-molded structure replaces the traditional upper and lower insulating parts of the cover plate, also improving the bending strength of the cover plate.

[0067] The battery packaging top cover provided in this embodiment of the utility model has a current collecting part and a terminal post in the current collector piece integrally formed by cold forging process, and an insulation part and a cover plate main body integrally injection molded by PPS injection molding process. This can increase the bending strength and elastic recovery ability of the cover plate, and the bending strength is increased by 20%. In addition, this utility model adopts the current collecting part, the insulation part of the cover plate and the sealing ring extrusion sealing. Both the current collecting part and the insulation part of the cover plate are rigid structures, which have high reliability.

[0068] 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 current collector tab, characterized by: The current collecting sheet has an integrally formed current collecting portion and a terminal portion, the terminal portion is located at one end of the current collecting portion, the current collecting portion and the terminal portion are electrically connected, the thickness of the terminal portion is greater than the thickness of the current collecting portion, the connection between the current collecting portion and the terminal portion is a smooth transition chamfer connection structure, the terminal portion has a riveting hole penetrating through itself, and the riveting hole and a pole column cooperate to form a riveting structure.

2. The current collector tab of claim 1, wherein: The thickness ratio of the terminal portion to the current collecting portion is (1-3):(0.1-0.3); And / or, the thickness ratio of the terminal portion to the current collecting portion is less than or equal to 6:1; And / or, the thickness of the terminal portion is 1mm-3mm, and the thickness of the current collecting portion is 0.1mm-0.3mm.

3. The current collector tab of claim 1, wherein: The lower surfaces of the current collecting portion and the terminal portion are located in the same plane, and the upper surfaces of the current collecting portion and the terminal portion have the chamfer connection structure therebetween; And / or, the curvature radius of the chamfer connection structure is within 2mm.

4. The current collector tab of claim 1, wherein: The current collecting sheet is an integrally formed cold heading workpiece through a cold heading process.

5. A current collector sheet characterized by: The current collecting sheet has an integrally formed current collecting portion and a pole column portion, the pole column portion is electrically connected with the current collecting portion, and the pole column portion can be riveted with a riveting hole on a cover plate to form a riveting structure.

6. The current collector tab of claim 5, wherein: The end of the pole column portion away from the current collecting portion has a deformation guide hole, when the pole column portion is subjected to pressure applied along the axial direction of the pole column portion, the part of the pole column portion surrounding the deformation guide hole can be deformed in the radial direction of the pole column portion to form a head, and the deformation includes bending and / or stretching outward in the radial direction of the pole column portion; And / or, the diameter of the deformation guide hole gradually decreases in the direction approaching the current collecting portion; And / or, the deformation guide hole is a tapered hole; And / or, the outer peripheral surface of the pole column portion has a stepped structure; And / or, the pole column portion is a columnar structure, and the pole column portion is arranged perpendicularly to the current collecting portion; And / or, the current collecting sheet is an integrally formed cold heading workpiece through a cold heading process.

7. A battery pack top cover characterized by: The battery packaging top cover includes a cover plate, a sealing ring, a pole column, and the current collecting sheet according to any one of claims 1-4, the cover plate is riveted and fixed with the terminal portion of the current collecting sheet through the pole column, and the sealing ring is arranged between the cover plate and the terminal portion of the current collecting sheet and sealingly cooperates with the cover plate and the terminal portion of the current collecting sheet; Or, the battery packaging top cover includes a cover plate, a sealing ring, and the current collecting sheet according to any one of claims 5-6, the current collecting sheet is riveted and fixed with the cover plate through the pole column portion thereof, the sealing ring is sleeved on the pole column portion and located between the current collecting portion and the cover plate, and the sealing ring sealingly cooperates with the current collecting portion and the cover plate.

8. The battery pack top cover according to claim 7, wherein Further comprising: An explosion-proof valve arranged in the cover plate; And / or, a pressure relief hole penetrating through the cover plate is arranged on the cover plate, and the explosion-proof valve is arranged in the pressure relief hole; And / or, a dust sheet is further arranged on the cover plate, and the dust sheet covers the pressure relief hole.

9. A battery case characterized by comprising: Comprise: A shell and the battery packaging top cover according to any one of claims 7-8, the battery packaging top cover is fixedly combined with the shell, and the current collecting sheet is located inside the battery shell.

10. A battery, characterized by The battery core and the battery shell of claim 9 are encapsulated in the battery shell, and the tab of the battery core is electrically connected with the pole portion of the current collector on the battery encapsulation top cover. ​

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