Cover plate assembly and lithium battery

Abstract

The utility model provides a kind of cover plate assembly and lithium battery, it is related to lithium battery technical field, the cover plate assembly is used to cover the opening of lithium battery shell, including upper cover plate, flanging ring and pole, pole hole is set through on upper cover plate, the thickness direction two sides of upper cover plate are respectively first face and second face, second face is towards shell;Flanging ring is set in second face, and the through hole that is aligned with pole hole and is communicated is formed in middle part, and ring groove is formed between flanging ring and upper cover plate;Flexible insulating component is set on pole, and flexible insulating component is used to insulate pole and upper cover plate, and flexible insulating component is threaded through hole, and embedded in ring groove. By embedding flexible insulating component in ring groove in the side of upper cover plate towards shell, the fixed position of upper cover plate and pole is located in the inside of upper cover plate, reduce the overall height of battery, also reduce the probability of damage due to collision, reduce the security risk such as battery internal short circuit, leakage, improve the safety reliability of battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cover plate assembly and a lithium battery. Background Technology

[0002] With the rapid development of technology, lithium batteries, as an efficient and environmentally friendly energy storage solution, have been widely used in many fields, such as portable electronic devices, electric vehicles, and energy storage systems.

[0003] For example, patent CN221994590U discloses a power battery top cover and a power battery, including a cover plate with a through-hole group of terminal post holes. An upper plastic component group is disposed on the upper side of the cover plate, corresponding to the terminal post hole group, and the terminal post group passes through the terminal post hole group. By fixing the terminal post group with the upper plastic component group on the upper side of the cover plate, the exposed height of the terminal post group is relatively large, increasing the overall height of the battery and limiting its usability. Furthermore, the upper plastic component group is located on the outside of the cover plate, making it susceptible to external collisions and impacts, which could damage the terminal post or cause short circuits due to contact with external conductive materials, thus increasing the battery's safety risks. Utility Model Content

[0004] In view of this, the present invention proposes a cover plate assembly and a lithium battery, which can solve the above problems.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a cover plate assembly for covering the opening of a lithium battery casing, comprising: The upper cover plate has a through-hole for the pole post. The two sides of the upper cover plate in the thickness direction are a first side and a second side, with the second side facing the outer shell. A flange ring is disposed on the second surface, and a through hole is formed in its middle portion that aligns with and communicates with the pole post hole; an annular groove is formed between the flange ring and the upper cover plate; and The pole post is fitted with a flexible insulating component, which is used to isolate the pole post from the upper cover plate. The flexible insulating component passes through the through hole and is embedded in the annular groove.

[0006] Based on the above technical solutions, preferably, the flexible insulating component includes a first insulating component and a second insulating component. The first insulating component is disposed in the electrode hole to isolate the electrode and the upper cover plate, and the second insulating component is embedded in the annular groove.

[0007] More preferably, the second insulating member has a side enclosure and a bottom enclosure connected to each other, the side enclosure being used to cooperate with the outer periphery of the pole post, and the bottom enclosure being used to support the pole post.

[0008] More preferably, the bottom portion has a bottom hole formed around the edge away from the side portion, and the diameter of the bottom hole is smaller than the diameter of the through hole.

[0009] Based on the above technical solutions, preferably, a sealing ring is provided on the flexible insulating component, the sealing ring is located within the annular groove, and is used to seal the upper cover plate and the flexible insulating component.

[0010] Based on the above technical solutions, preferably, the upper cover plate and the flange ring are integrally formed.

[0011] Based on the above technical solutions, preferably, the second side is provided with a connecting piece, and a lower plastic is provided between the connecting piece and the upper cover plate. A plastic through hole is opened through the lower plastic at the alignment point with the electrode hole. A boss is provided on the connecting piece, and the boss passes through the plastic through hole and connects to the electrode.

[0012] More preferably, the opposite sides of the connecting piece are bent toward the upper cover plate to form a tab welding portion.

[0013] Based on the above technical solutions, preferably, the upper cover plate is provided with an explosion-proof valve and a liquid injection hole.

[0014] This utility model also provides a lithium battery, including a housing and the aforementioned cover plate assembly. The housing contains a battery cell, and the housing has an opening. The upper cover plate of the cover plate assembly is disposed on the opening.

[0015] The cover plate assembly and lithium battery of this utility model have the following advantages over the prior art: (1) By isolating the terminal post and the top cover plate with a flexible insulating component, the risk of short circuit is avoided. By embedding the flexible insulating component in the annular groove, its stability during the assembly process can be guaranteed, and the displacement of the flexible insulating component due to external force can be prevented, which further enhances the structural stability of the cover plate assembly. In addition, by forming the annular groove on the side of the top cover plate facing the outer shell, the fixed position of the top cover plate and the terminal post is located on the inner side of the top cover plate, thereby reducing the overall height of the battery, so that the battery can better fit the compact space structure inside the device, and also reduce the probability of damage due to collision; (2) By bending the tab welding part upwards to form on opposite sides of the connecting piece, sufficient bending space is left between the connecting piece and the cell inside the casing when the cover plate assembly and the lithium battery casing are installed, so that the tab can be bent in this space and welded to the side of the tab welding part away from the upper cover plate. At the same time, it can also reduce the overall height of the lithium battery to a certain extent and improve the energy density. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the cover plate assembly of this utility model; Figure 2 This is an exploded view of the cover plate assembly of this utility model; Figure 3 This is a top view of the cover plate assembly of this utility model; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 4 Enlarged view of section B; Figure 6 This is a perspective view of the upper cover plate in the cover plate assembly of this utility model; Figure 7 This is a perspective view of the lithium battery of this utility model; Figure 8 This is a perspective view of the outer casing of the lithium battery of this utility model.

[0018] Figure label: 1. Outer shell; 11. Opening; 2. Top cover plate; 21. Electrode post hole; 22. First side; 23. Second side; 24. Injection hole; 3. Flanged ring; 31. Through hole; 4. Ring groove; 5. Electrode post; 6. Flexible insulating component; 61. First insulating component; 611. First insulating part; 612. Second insulating part; 62. Second insulating component; 621. Side part; 622. Bottom part; 623. Bottom hole; 7. Sealing ring; 8. Connecting piece; 81. Boss; 82. Electrode lug welding part; 9. Lower plastic; 91. Plastic through hole; 10. Explosion-proof valve. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 8As shown, this utility model provides a cover plate assembly, which includes an opening 11 for covering a lithium battery casing 1, including an upper cover plate 2, a flange ring 3, and an electrode post 5. The upper cover plate 2 has a through electrode post hole 21, and the two sides of the upper cover plate 2 in the thickness direction are a first surface 22 and a second surface 23, respectively, with the second surface 23 facing the casing 1. The flange ring 3 is disposed on the second surface 23, and a through hole 31 is formed in the middle of the flange ring 3, which is aligned with and communicates with the electrode post hole 21. An annular groove 4 is formed between the flange ring 3 and the upper cover plate 2. A flexible insulating component 6 is sleeved on the electrode post 5. The flexible insulating component 6 is used to isolate the electrode post 5 and the upper cover plate 2. The flexible insulating component 6 passes through the through hole 31 and is embedded in the annular groove 4.

[0021] The electrode post 5 and the upper cover plate 2 are effectively isolated by a flexible insulating component 6, avoiding the risk of short circuits that may be caused by direct contact between the electrode post 5 and the upper cover plate 2, thus improving the safety and reliability of the lithium battery. Simultaneously, the flexible insulating component 6 is embedded within the annular groove 4, ensuring its stability during assembly and preventing displacement due to external forces, further enhancing the structural stability of the cover plate assembly. Furthermore, by forming the annular groove 4 on the side of the upper cover plate 2 facing the outer casing 1, the fixed position of the upper cover plate 2 and the electrode post 5 is located inside the upper cover plate 2, thereby reducing the overall height of the battery. This allows the battery to better fit the compact internal space of the device, and also reduces the probability of damage due to collisions, thus reducing safety hazards such as internal short circuits and leakage, and improving the battery's safety and reliability.

[0022] In some embodiments, the upper cover plate 2 and the flange ring 3 are integrally formed. The integral forming makes the connection between the upper cover plate 2 and the flange ring 3 more secure, effectively solving the problems of insufficient connection strength or poor sealing at the connection, improving the overall strength and stability of the cover plate assembly, and enabling it to better withstand external pressure and impact.

[0023] Optionally, the upper cover plate 2 and the flange ring 3 are riveted together. This riveting method ensures a tighter and more secure connection between the upper cover plate 2 and the flange ring 3, effectively preventing loosening or separation during use and improving the overall structural stability of the cover plate assembly. Furthermore, riveting is a weld-free connection method, avoiding the impact of welding defects and heat-affected zones on material properties, thus guaranteeing the connection strength and sealing of the upper cover plate 2 and the flange ring 3, further enhancing the reliability and safety of the cover plate assembly.

[0024] like Figures 1 to 8As shown, in some embodiments, the flexible insulating component 6 includes a first insulating element 61 and a second insulating element 62. The first insulating element 61 is disposed within the electrode post hole 21, isolating the electrode post 5 and the upper cover plate 2. The second insulating element 62 is embedded within the annular groove 4. The first insulating element 61 fills the electrode post hole 21, ensuring the isolation effect between the electrode post 5 and the upper cover plate 2 within the electrode post hole 21. The second insulating element 62 is embedded within the annular groove 4, enhancing the fixing effect of the entire flexible insulating component 6, improving the sealing and insulation of the cover plate assembly, effectively preventing electrolytes and other substances from penetrating through the gap between the electrode post 5 and the upper cover plate 2, and extending the service life of the lithium battery.

[0025] Of course, the first insulating member 61 can also be connected to the second insulating member 62, or the first insulating member 61 and the second insulating member 62 can be integrally formed.

[0026] In this embodiment, the first insulating member 61 has a stepped structure and includes a first insulating part 611 and a second insulating part 612 connected to each other. The first insulating part 611 is sleeved on the outside of the pole post 5 to isolate the pole post 5 from the pole post hole 21. The second insulating part 612 is bent and connected to the first insulating part 611, located in the annular groove 4, and is used to cooperate with the top of the annular groove 4, thereby limiting and fixing the first insulating part 611.

[0027] In some embodiments, the first insulating member 61 is also configured with a stepped structure, and the second insulating member 62 has a connected side portion 621 and a bottom portion 622. The side portion 621 is used to cooperate with the outer peripheral side of the electrode post 5, and the bottom portion 622 is used to support the electrode post 5. The side portion 621 is used to cooperate with the outer peripheral side of the electrode post 5, which can tightly fit the outer surface of the electrode post 5 located in the annular groove 4, forming a good sealing effect and preventing external gas or liquid from entering the lithium battery through the gap between the electrode post 5 and the second insulating member 62, thereby protecting the battery cell inside the lithium battery from the influence of the external environment. The bottom portion 622 is used to support the electrode post 5, providing a stable support structure for the electrode post 5, so that the electrode post 5 can maintain a stable position during use.

[0028] During assembly, the flexible insulating component 6 is first fitted onto the pole post 5, and then the pole post 5 is inserted through the second side 23 of the upper cover plate 2. During this process, the flexible insulating part passes through the through hole 31 of the flange ring 3 by compression deformation, and after passing through the through hole 31, it returns to its original shape by its own deformation recovery force, thus being embedded in the ring groove 4. The end of the pole post 5 protrudes out of the pole post hole 21 of the upper cover plate 2, thereby completing the assembly.

[0029] Optionally, the bottom portion 622, away from the side portion 621, forms a bottom hole 623, the diameter of which is smaller than the diameter of the through hole 31. The bottom portion 622 supports the pole post 5. By setting the diameter of the bottom hole 623 enclosed by the bottom edge of the bottom portion 622 to be smaller than the diameter of the through hole 31, after the flexible insulating member 6 is assembled in the annular groove 4, at least a portion of the bottom portion 622 is located within the through hole 31, further improving the support effect on the pole post 5 and also providing a certain sealing and isolation effect on the through hole 31.

[0030] like Figures 1 to 8 As shown, in some embodiments, a sealing ring 7 is fitted onto the flexible insulating component 6. The sealing ring 7 is confined within the annular groove 4 and is used to seal the upper cover plate 2 and the flexible insulating component 6. The sealing ring 7 further enhances the sealing performance between the flexible insulating component 6 and the upper cover plate 2. By confining the sealing ring 7 within the annular groove 4, the stability of the sealing position of the sealing ring 7 is ensured. This effectively fills the tiny gaps between the upper cover plate 2 and the flexible insulating component 6, preventing the penetration of gas and liquid, and reducing the safety risks caused by poor sealing.

[0031] In some embodiments, the second surface 23 is provided with a connecting piece 8, and a lower plastic 9 is provided between the connecting piece 8 and the upper cover plate 2. A plastic through hole 91 is provided through the lower plastic 9 at the alignment point with the electrode hole 21. A boss 81 is provided on the connecting piece 8, and the boss 81 passes through the plastic through hole 91 and connects to the electrode 5. The lower plastic 9 serves as insulation and buffering, preventing electrical contact between the connecting piece 8 and the upper cover plate 2, and also absorbing some vibration, protecting the connection stability between the connecting piece 8 and the electrode 5. The boss 81 passes through the plastic through hole 91 and connects to the electrode 5. Specifically, the boss 81 is welded to the electrode 5, ensuring the electrical connection stability between the connecting piece 8 and the electrode 5, thus achieving a stable connection between the connecting piece 8 and the electrode 5.

[0032] In some embodiments, the opposite sides of the connecting piece 8 are bent toward the upper cover plate 2 to form a tab welding portion 82. The tab welding portion 82 is used to weld and fix to the tab. By bending the tab welding area upward, sufficient bending space is left between the connecting piece 8 and the cell inside the housing 1 when the cover plate assembly and the lithium battery housing 1 are installed, which facilitates the tab bending within this space and welding and fixing it to the side of the tab welding portion 82 away from the upper cover plate 2. At the same time, it can also reduce the overall height of the lithium battery to a certain extent and improve the energy density.

[0033] In some embodiments, the upper cover plate 2 is provided with an explosion-proof valve 10 and an injection hole 24. The explosion-proof valve 10 is used to release pressure when the internal pressure of the battery abnormally increases, preventing dangerous situations such as battery explosion and ensuring the safe use of the battery. The injection hole 24 facilitates the electrolyte injection operation of the lithium battery, allowing the electrolyte to be smoothly injected into the lithium battery and ensuring the normal operation of the lithium battery. This design enables the cover plate assembly to not only achieve basic sealing and insulation functions, but also to have important safety protection and functional support, improving the overall performance and safety of the lithium battery.

[0034] It is known that there are usually two poles 5, one for the positive terminal and one for the negative terminal, which are spaced apart on the upper cover plate 2. Correspondingly, there are two flexible insulating components 6, which are respectively fitted onto the positive and negative poles. There are two pole hole 21 on the upper cover plate 2, one for the positive terminal and one for the negative terminal. The positive pole passes through the positive pole hole, and the negative pole passes through the negative pole hole. There are two connecting pieces 8, and two plastic through holes 91 are formed on the lower plastic 9. The two protrusions 81 on the two connecting pieces 8 pass through the two plastic through holes 91 and are used for fixed connection with the positive and negative poles.

[0035] In summary, this application provides a cover plate assembly where the terminal post 5 and the upper cover plate 2 are effectively isolated by a flexible insulating component 6. This avoids the risk of short circuits that may be caused by direct contact between the terminal post 5 and the upper cover plate 2, improving the safety and reliability of the lithium battery. Simultaneously, the flexible insulating component 6 is embedded within the annular groove 4, ensuring its stability during assembly and preventing displacement due to external forces, further enhancing the structural stability of the cover plate assembly. Furthermore, by forming the annular groove 4 on the side of the upper cover plate 2 facing the outer casing 1, the fixed position of the upper cover plate 2 and the terminal post 5 is located inside the upper cover plate 2, thereby reducing the overall height of the battery. This allows the battery to better fit the compact internal space of the device. Additionally, it reduces the probability of damage due to collisions, thus reducing safety hazards such as internal short circuits and leakage, and improving the battery's safety and reliability.

[0036] like Figures 1 to 8 As shown, the present invention also provides a lithium battery, including a housing 1 and a cover plate assembly as described in the above embodiments. A battery cell is disposed inside the housing 1, and an opening 11 is provided on the housing 1. The upper cover plate 2 of the cover plate assembly is disposed on the opening 11.

[0037] This lithium battery utilizes the aforementioned cover assembly, thus possessing a series of beneficial effects. The upper cover 2 of the cover assembly matches the opening 11 of the outer casing 1, tightly sealing the opening 11 and ensuring the airtightness of the internal cells of the lithium battery. Simultaneously, the flexible insulating component 6 and sealing ring 7 in the cover assembly effectively prevent electrolyte leakage and the ingress of external gases, improving the safety and reliability of the lithium battery. Furthermore, the connecting piece 8 and electrode welding part 82 in the cover assembly provide stable support for the electrical connection of the lithium battery, ensuring its normal charge and discharge performance. Therefore, this lithium battery is more stable and safer during use, has a longer service life and higher performance, and is suitable for various devices and applications requiring lithium batteries.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cover assembly for covering an opening (11) of a lithium battery casing (1), characterized in that, include: The upper cover plate (2) has a through-hole (21) for pole post. The upper cover plate (2) has a first surface (22) and a second surface (23) on both sides in the thickness direction, and the second surface (23) faces the outer shell (1). A flange ring (3) is disposed on the second surface (23), and a through hole (31) is formed in its middle portion, which is aligned with and communicates with the pole hole (21). An annular groove (4) is formed between the flange ring (3) and the upper cover plate (2); and The pole (5) is fitted with a flexible insulating component (6), which is used to isolate the pole (5) from the upper cover plate (2). The flexible insulating component (6) passes through the through hole (31) and is embedded in the annular groove (4).

2. The cover plate assembly as claimed in claim 1, characterized in that: The flexible insulating component (6) includes a first insulating component (61) and a second insulating component (62). The first insulating component (61) is disposed in the pole hole (21) to isolate the pole (5) and the upper cover plate (2). The second insulating component (62) is embedded in the annular groove (4).

3. The cover plate assembly as claimed in claim 2, characterized in that: The second insulating member (62) has a side enclosure (621) and a bottom enclosure (622) connected to each other. The side enclosure (621) is used to cooperate with the outer periphery of the pole post (5), and the bottom enclosure (622) is used to support the pole post (5).

4. The cover plate assembly as claimed in claim 3, characterized in that: The bottom portion (622) is surrounded by an edge away from the side portion (621) to form a bottom hole (623), the diameter of which is smaller than the diameter of the through hole (31).

5. The cover plate assembly as claimed in claim 1, characterized in that: A sealing ring (7) is fitted on the flexible insulating component (6). The sealing ring (7) is located within the annular groove (4) and is used to seal the upper cover plate (2) and the flexible insulating component (6).

6. The cover plate assembly as claimed in claim 1, characterized in that: The upper cover plate (2) and the flange ring (3) are integrally formed.

7. The cover plate assembly as claimed in claim 1, characterized in that: The second surface (23) is provided with a connecting piece (8), and a lower plastic (9) is provided between the connecting piece (8) and the upper cover plate (2). A plastic through hole (91) is provided through the lower plastic (9) at the alignment point with the pole hole (21). A boss (81) is provided on the connecting piece (8), and the boss (81) passes through the plastic through hole (91) and is connected to the pole (5).

8. The cover plate assembly as claimed in claim 7, characterized in that: The connecting piece (8) is bent toward the upper cover plate (2) on both sides to form the electrode lug welding part (82).

9. The cover plate assembly as claimed in claim 1, characterized in that: The upper cover plate (2) is provided with an explosion-proof valve (10) and a liquid injection hole (24).

10. A lithium battery, characterized in that: The device includes a housing (1) and a cover plate assembly as described in any one of claims 1 to 9, wherein a battery cell is disposed inside the housing (1), and an opening (11) is provided on the housing (1), and an upper cover plate (2) of the cover plate assembly is disposed on the opening (11).

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