Lithium battery cover plate assembly and lithium battery

Abstract

The application relates to the technical field of batteries, and provides a lithium battery cover plate assembly and a lithium battery, which comprise a rivet, a threaded terminal, a first insulating pad, a cover plate, a second insulating pad and a current collector disc which are sequentially connected through the rivet; the threaded terminal is electrically insulated from the cover plate through the first insulating pad; the cover plate is electrically insulated from the current collector disc through the second insulating pad; the rivet is electrically insulated from the cover plate and is electrically connected with the threaded terminal. In this way, when assembling a battery module, the battery can be fixed on the module in a bolt-fastening mode, so that the battery can be quickly installed and disassembled, and the assembly efficiency of the battery module is improved. When a single battery fails, the faulty battery can be disassembled and replaced with a new battery, so that the problem that the battery module is easily scrapped as a whole due to the failure of a single battery is reduced, the step-by-step utilization and recycling of the battery are facilitated, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a lithium battery cover assembly and a lithium battery. Background Technology

[0002] In recent years, benefiting from policies and subsidies, my country's new energy vehicle production has grown rapidly, leading to increased demand for power batteries. At the same time, the number of power batteries retired each year is also constantly increasing. The cascade utilization and recycling of power lithium batteries has become a problem that must be addressed.

[0003] The most basic component of a power battery pack is the module, which is made up of multiple individual battery cells connected in series and parallel. Currently, the series and parallel connection of individual battery cells is mostly achieved by using current-carrying plates to connect the positive and negative terminals of the battery through resistance welding or laser welding.

[0004] However, if one of the batteries in the module malfunctions, the entire module will be rendered unusable, affecting the reuse of the batteries and increasing costs. Summary of the Invention

[0005] This invention provides a lithium battery cover assembly and a lithium battery, which solves the problem that battery modules in the prior art are easily scrapped due to the failure of a single battery, and is conducive to the cascade utilization and recycling of batteries, thereby reducing costs.

[0006] This invention provides a lithium battery cover assembly, comprising:

[0007] A rivet, and a threaded terminal, a first insulating pad, a cover plate, a second insulating pad, and a current collector connected in sequence by the rivet;

[0008] The threaded terminal is electrically insulated from the cover plate by the first insulating pad;

[0009] The cover plate is electrically insulated from the current collector by the second insulating pad;

[0010] The rivet is electrically insulated from the cover plate and electrically connected to the threaded terminal.

[0011] According to a lithium battery cover assembly provided by the present invention, the cover plate is provided with a through hole, an insulating ring is inserted through the through hole, and a rivet is inserted through the insulating ring.

[0012] According to a lithium battery cover assembly provided by the present invention, the insulating ring is integrally formed on the first insulating pad or the second insulating pad.

[0013] According to a lithium battery cover assembly provided by the present invention, at least one rivet is provided.

[0014] According to a lithium battery cover assembly provided by the present invention, the threaded terminal is provided with a "I"-shaped or "+"-shaped marking groove on the side facing away from the cover.

[0015] According to a lithium battery cover assembly provided by the present invention, the current collector includes a first connecting portion and a second connecting portion; the first connecting portion corresponds to the second insulating pad and is used for the rivet to pass through; the second connecting portion extends beyond the second insulating pad, and a plurality of boss-shaped welding areas are formed on the side of the second connecting portion opposite to the second insulating pad.

[0016] According to a lithium battery cover assembly provided by the present invention, a plurality of grooves are provided on the side of the second connecting portion facing the second insulating pad, and the plurality of grooves are arranged around the center of the second connecting portion; the grooves are formed by stamping to form the welding area on the side of the second connecting portion opposite to the second insulating pad.

[0017] According to a lithium battery cover assembly provided by the present invention, the cover is provided with an injection hole for communicating with the inner cavity of the battery; a first through hole is provided on the first insulating pad, and a second through hole is provided on the threaded terminal, the positions of the first through hole and the second through hole are both corresponding to the position of the injection hole.

[0018] According to a lithium battery cover assembly provided by the present invention, an explosion-proof valve is provided on the cover, a first through hole is provided on the first insulating pad, and a second through hole is provided on the threaded terminal, the positions of the first through hole and the second through hole are both corresponding to the position of the explosion-proof valve.

[0019] The present invention also provides a lithium battery, including the above-described lithium battery cover assembly.

[0020] This invention provides a lithium battery cover assembly and a lithium battery. The assembly uses rivets to connect threaded terminals, a first insulating pad, a cover plate, a second insulating pad, and a current collector into a single unit, ensuring the stability of the threaded terminal connection. During battery assembly, the current collector connects to the core inside the battery casing to draw out current. The cover plate is fixed to the battery casing for battery encapsulation. The threaded terminals are electrically connected to the current collector via rivets, allowing the threaded terminals themselves to function as battery electrodes. The threaded terminals are electrically insulated from the cover plate via the first insulating pad, and the current collector is electrically insulated from the cover plate via the second insulating pad to prevent short circuits. During battery module assembly, the battery can be fixed to the module in a manner similar to bolt fixing, enabling rapid installation and removal of the battery and improving assembly efficiency. When a single battery fails, it can be removed and replaced with a new one, reducing the risk of the entire battery module being scrapped due to a single battery failure. This facilitates the reuse and recycling of batteries, reducing costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is an overall view of the lithium battery cover assembly provided by the present invention after assembly.

[0023] Figure 2 This is one of the structural schematic diagrams of the lithium battery cover plate assembly provided by the present invention;

[0024] Figure 3 This is the second structural schematic diagram of the lithium battery cover assembly provided by the present invention.

[0025] Figure label:

[0026] 1. Rivet; 10. Large end; 2. Threaded terminal; 20. Third rivet hole; 21. Marking groove; 22. Second through hole; 3. First insulating pad; 30. First rivet hole; 31. First through hole; 4. Cover plate; 40. Connecting hole; 41. Liquid injection hole; 42. Explosion-proof valve; 5. Second insulating pad; 50. Second rivet hole; 6. Collector plate; 60. Fourth rivet hole; 61. First connecting part; 62. Second connecting part; 620. Groove; 7. Insulating ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] To facilitate understanding of the lithium battery cover assembly and lithium battery provided by this invention, its application scenario is first described. A battery module is a basic component of a battery pack, formed by connecting multiple individual batteries in series and parallel. In existing technologies, current-carrying cells are typically connected to the positive and negative terminals of the battery via resistance welding or laser welding to achieve series and parallel connections. However, when one battery in the battery module malfunctions, the entire module can easily become unusable, affecting the reuse and recycling of batteries and increasing costs. Therefore, this invention provides a lithium battery cover assembly and lithium battery to reduce the problem of battery modules becoming unusable due to the failure of a single battery, facilitating the reuse and recycling of batteries and reducing costs.

[0029] The following is combined Figures 1-3 The present invention describes a lithium battery cover assembly and a lithium battery.

[0030] Reference Figure 1 and Figure 2 A lithium battery cover assembly includes a rivet 1, and a threaded terminal 2, a first insulating pad 3, a cover plate 4, a second insulating pad 5, and a current collector 6 connected sequentially by the rivet 1; wherein the threaded terminal 2 has a threaded structure; the threaded terminal 2 is electrically insulated from the cover plate 4 by the first insulating pad 3; the cover plate 4 is electrically insulated from the current collector 6 by the second insulating pad 5; the rivet 1 is electrically insulated from the cover plate 4 and electrically connected to the threaded terminal 2.

[0031] In practical applications, the threaded terminal 2, first insulating pad 3, cover plate 4, second insulating pad 5, and current collector 6 are connected as a whole by rivets 1 to ensure the stability of the threaded terminal 2 connection. During battery assembly, the current collector 6 is welded to the core inside the battery casing to draw out the current. The cover plate 4 is closed and fixed to the battery casing for battery encapsulation. The threaded terminal 2 is electrically connected to the current collector 6 via rivets 1, allowing the threaded terminal 2 itself to serve as an electrode of the battery. The threaded terminal 2 is electrically insulated from the cover plate 4 by the first insulating pad 3, and the current collector 6 is electrically insulated from the cover plate 4 by the second insulating pad 5 to prevent short circuits. When assembling the battery module, the battery can be fixed to the module using a bolt-like method to achieve quick installation and removal, improving the assembly efficiency of the battery module. When a single battery fails, the faulty battery can be removed and replaced with a new one, reducing the risk of the entire battery module being scrapped due to a single battery failure. This facilitates the reuse and recycling of batteries, reducing costs.

[0032] There must be at least one rivet 1, and the specific number can be selected according to actual needs, as long as the threaded terminal 2, the first insulating pad 3, the cover plate 4, the second insulating pad 5, and the current collector 6 are stably connected together. When there is one rivet 1, it can be located at the central axis of the lithium battery cover assembly; when there is more than one rivet 1, the rivets 1 can be evenly distributed around the central axis of the lithium battery cover assembly. In this embodiment, the specific structure of the lithium battery cover assembly is described using three rivets 1 as an example.

[0033] Reference Figure 2 and Figure 3The cover plate 4 is disc-shaped and made of aluminum or other metal. Three connecting holes 40 are arranged around the center of the cover plate 4. A second rivet hole 50 is provided on the second insulating pad 5, the position of which corresponds to the position of the connecting holes 40. An insulating ring 7 protrudes from the side of the second insulating pad 5 facing the cover plate 4, allowing the rivet 1 to pass through. The insulating ring 7 is integrally formed on the second insulating pad 5 and surrounds the second rivet hole 50. The outer diameter of the insulating ring 7 is not greater than the diameter of the connecting hole 40. When the second insulating pad 5 is placed on the cover plate 4, the insulating ring 7 passes through the connecting hole 40 to electrically insulate the rivet 1 from the inner wall of the connecting hole 40. Specifically, the outer diameter of the insulating ring 7 is adapted to the connecting hole 40, and when the insulating ring 7 passes through the connecting hole 40, its outer wall abuts against the inner wall of the connecting hole 40.

[0034] The first insulating pad 3 has a first rivet hole 30, the position of which corresponds to the position of the connecting hole 40, and the diameter of the first rivet hole 30 is smaller than the outer diameter of the insulating ring 7. When the insulating ring 7 passes through the connecting hole 40, its end face abuts against the first insulating ring 7 to improve the insulation effect.

[0035] In another embodiment, the insulating ring 7 can also be disposed on the first insulating pad 3. Accordingly, after the insulating ring 7 passes through the connecting hole 40, its end face abuts against the second insulating pad 5. In addition, the insulating ring 7 and the first insulating pad 3 or the second insulating pad 5 can also be connected separately. In short, it is only necessary to ensure that the insulating ring 7 can electrically isolate the rivet 1 from the inner wall of the connecting hole 40.

[0036] A third rivet hole 20 is provided around the center of the threaded terminal 2, and the position of the third rivet hole 20 corresponds to the position of the connecting hole 40. A fourth rivet hole 60 is provided on the collector plate 6 at the position corresponding to the connecting hole 40. The rivet 1 can be made of aluminum, copper or other metal materials, and one end of the rivet 1 has a large end head 10. The large end head 10 of the rivet 1 abuts against the side of the collector plate 6 away from the second insulating pad 5. The other end of the rivet 1 is embedded in the third rivet hole 20. The first insulating pad 3 and the second insulating pad 5 can generate a certain compression allowance. When pressure is applied to the threaded terminal 2 using a press, the rivet 1 can be deformed to rivet and fix the threaded terminal 2.

[0037] The threaded terminal 2 can be made of copper, aluminum or other metal materials, and its outer circumferential surface has a threaded structure. The diameter of the threaded terminal 2 can be slightly larger than or slightly smaller than the cover plate 4, as long as the two can be electrically isolated by the first insulating pad 3. In this embodiment, one of the threaded terminals 2 at both ends of the battery is larger than the cover plate 4 and the other is smaller than the cover plate 4, so that the battery can be screwed in from one side of the module, which facilitates the assembly and disassembly of the battery.

[0038] A marking groove 21 is provided on the side of the threaded terminal 2 facing away from the first insulating pad 3 to distinguish the positive and negative terminals of the battery. Specifically, when the threaded terminal 2 is the positive terminal of the battery, the marking groove 21 is in the shape of a cross; when the threaded terminal 2 is the negative terminal of the battery, the marking groove 21 is in the shape of a flathead screwdriver. In addition to distinguishing the positive and negative terminals of the battery, the marking groove 21 can also be used with a crosshead or flathead screwdriver to facilitate the installation and removal of the battery.

[0039] In one embodiment, when the threaded terminal 2 is used as the positive electrode of the battery, the cover plate 4 is provided with an injection hole 41 for communicating with the inner cavity of the battery. Correspondingly, the first insulating pad 3 is provided with a first through hole 31, the position of which corresponds to the injection hole 41. The threaded terminal 2 is provided with a second through hole 22, the position of which corresponds to the first through hole 31, so that the operator can inject electrolyte into the battery through the injection hole 41.

[0040] In another embodiment, when the threaded terminal 2 serves as the negative terminal of the battery, an explosion-proof valve 42 is provided on the cover plate 4. Correspondingly, a first through hole 31 is provided on the first insulating pad 3, corresponding to the position of the explosion-proof valve 42. A second through hole 22 is provided on the threaded terminal 2, corresponding to the position of the first through hole 31, so that when the internal pressure of the battery is too high, the pressure can be released through the explosion-proof valve 42. The lithium battery explosion-proof valve 42 is prior art and not a major improvement of this invention; its structure will not be described in detail here.

[0041] Reference Figure 2 and Figure 3 The current collector 6 includes a first connecting portion 61 and a second connecting portion 62. The first connecting portion 61 corresponds to the second insulating pad 5, and a fourth rivet hole 60 is provided on the first connecting portion 61. The second connecting portion 62 extends beyond the second insulating pad 5. A plurality of grooves 620 are provided on the side of the second connecting portion 62 facing the second insulating pad 5. The grooves 620 are arranged around the center of the second connecting portion 62. The grooves 620 are formed by stamping, thereby forming a boss-shaped welding area on the side of the second connecting portion 62 opposite to the second insulating pad 5 while forming the grooves 620. When encapsulating the battery, the boss-shaped welding area contacts the core to improve the contact effect and contact area between the welding area and the core, thereby ensuring a better welding effect.

[0042] Specifically, when the current collector 6 is the positive current collector of the battery, it can be made of aluminum; when the current collector 6 is the negative current collector of the battery, it can be made of copper plated with nickel or nickel.

[0043] Specifically, the materials of the first insulating pad 3 and the second insulating pad 5 can be selected according to actual needs. For example, they can be polypropylene or other organic polymer materials. However, it is necessary to ensure that the first insulating pad 3 and the second insulating pad 5 can generate a certain amount of compressive deformation while playing an insulating role.

[0044] The lithium battery provided by the present invention is described below. The lithium battery described below can be referred to in correspondence with the lithium battery cover assembly described above.

[0045] A lithium battery includes a casing, a core, and the aforementioned lithium battery cover assembly; the core is disposed inside the casing; a protrusion on the second connecting portion 62 contacts the electrode of the core and is laser welded; the cover 4 is fixed to the casing by laser welding.

[0046] The innovation of this invention lies in the following: In practical applications, the threaded terminal 2, the first insulating pad 3, the cover plate 4, the second insulating pad 5, and the current collector 6 are connected as a whole by rivets 1 to ensure the stability of the threaded terminal 2 connection. During battery assembly, the current collector 6 is welded to the core inside the battery casing to lead out the current. The cover plate 4 is fixed to the battery casing for battery encapsulation. The threaded terminal 2 is electrically connected to the current collector 6 via rivets 1, allowing the threaded terminal 2 itself to serve as an electrode of the battery. The threaded terminal 2 is electrically insulated from the cover plate 4 by the first insulating pad 3, and the current collector 6 is electrically insulated from the cover plate 4 by the second insulating pad 5 to avoid short circuits. During battery module assembly, the battery can be fixed to the module in a manner similar to bolt fixing, enabling rapid installation and removal of the battery and improving the assembly efficiency of the battery module. When a single battery fails, the faulty battery can be removed and replaced with a new one, thereby reducing the risk of the entire battery module being scrapped due to a single battery failure. This facilitates the reuse and recycling of batteries and reduces costs.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery cover assembly, characterized in that, include: A rivet (1), and a threaded terminal (2), a first insulating pad (3), a cover plate (4), a second insulating pad (5), and a collector plate (6) connected in sequence by the rivet (1); The threaded terminal (2) is electrically insulated from the cover plate (4) by the first insulating pad (3); The cover plate (4) is electrically insulated from the collector plate (6) by the second insulating pad (5); The rivet (1) is electrically insulated from the cover plate (4) and electrically connected to the threaded terminal (2); The threaded terminal (2) is provided with a "I" or "+" shaped marking groove (21) on the side facing away from the cover plate (4). One of the threaded terminals (2) at both ends of the battery is larger than the cover plate (4) and the other is smaller than the cover plate (4) so ​​that the battery can be screwed in from one side of the module. The cover plate (4) is provided with an injection hole (41) or an explosion-proof valve (42) for connecting the inner cavity of the battery; the first insulating pad (3) is provided with a first through hole (31), and the threaded terminal (2) is provided with a second through hole (22). The positions of the first through hole (31) and the second through hole (22) correspond to the positions of the injection hole (41) or the explosion-proof valve (42).

2. The lithium battery cover assembly according to claim 1, characterized in that, The cover plate (4) is provided with a connecting hole (40), and an insulating ring (7) is inserted through the connecting hole (40). The rivet (1) is inserted through the insulating ring (7).

3. The lithium battery cover assembly according to claim 2, characterized in that, The insulating ring (7) is integrally formed on the first insulating pad (3) or the second insulating pad (5).

4. The lithium battery cover assembly according to claim 1, characterized in that, At least one rivet (1) is provided.

5. The lithium battery cover assembly according to claim 1, characterized in that, The collector plate (6) includes a first connecting portion (61) and a second connecting portion (62); the first connecting portion (61) corresponds to the second insulating pad (5) and is used for the rivet (1) to pass through; the second connecting portion (62) extends beyond the second insulating pad (5), and a plurality of boss-shaped welding areas are formed on the side of the second connecting portion (62) opposite to the second insulating pad (5).

6. The lithium battery cover assembly according to claim 5, characterized in that, The second connecting part (62) has a plurality of grooves (620) on the side facing the second insulating pad (5), and the plurality of grooves (620) are arranged around the center of the second connecting part (62); the grooves (620) are formed by stamping to form the welding area on the side of the second connecting part (62) opposite to the second insulating pad (5).

7. A lithium battery, characterized in that, Includes the lithium battery cover assembly as described in any one of claims 1-6.

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