Insulating piece, cover plate assembly, battery pack, battery package and electric device

Abstract

The application discloses an insulating piece, a cover plate assembly, a battery pack, a battery pack and an electric equipment, and belongs to the technical field of batteries. The insulating piece is provided with a through hole and a groove, the groove has a preset interval with the through hole, and the groove is arranged around the through hole; wherein the through hole is used for accommodating the conductive column, and the groove is used for accommodating the disc. The embodiment of the application realizes the accommodation of the conductive column and the disc in the limited space through the interval type arrangement of the through hole and the groove on the insulating piece. After the conductive column and the disc are installed on the insulating piece, the thickness of the insulating piece in the thickness direction is effectively reduced, and the occupation of the space of the battery cell is reduced, thereby the beneficial effect of improving the energy density of the battery is achieved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to an insulating component, a cover plate assembly, a battery pack, and an electrical device. Background Technology

[0002] The high energy density, lack of memory effect, long cycle life of a single cell, high efficiency, cleanliness, and pollution-free characteristics of lithium batteries have led to their widespread application.

[0003] Currently, lithium batteries mainly use injection-molded terminals, riveted terminals, and ceramic terminals. Ceramic terminals, due to their excellent high-temperature resistance and corrosion resistance, have the advantages of good insulation performance, high-temperature corrosion resistance, and high reliability.

[0004] However, because the ceramic terminals are much taller than the other two types of terminals, they occupy a large amount of space in the battery cell, reducing the battery's energy density. Utility Model Content

[0005] The purpose of this application is to provide an insulating component, cover plate assembly, battery pack, battery module, and electrical device that can solve the problem in the prior art where ceramic terminals occupy too much space in the battery cell, reducing battery energy density.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide an insulating member for a cover plate assembly. The insulating member has a through hole and a groove, with a preset interval between the groove and the through hole, and the groove is formed around the through hole. The through hole is used to accommodate a conductive post, and the groove is used to accommodate a disc.

[0008] In this embodiment, the through-hole is used to accommodate the positive or negative conductive post, thereby enabling current conduction. The groove is used to accommodate the disc. The groove surrounds the through-hole and maintains a preset distance from it, thus forming a physical isolation zone between them. This effectively isolates the conductive post and the disc, preventing the disc from interfering with the guide post and optimizing space utilization. This embodiment, through the spaced arrangement of through-holes and grooves on the insulating component, achieves the accommodation of the conductive post and disc within a limited space. After the conductive post and disc are installed on the insulating component, the thickness of the insulating component along its thickness direction is effectively reduced, thereby reducing the space occupied by the battery cell and improving battery energy density.

[0009] It should be noted that the spacing between the groove and the through hole ensures that the disc and the conductive post do not come into direct contact, preventing short circuits caused by vibration or thermal expansion. Simultaneously, in the event of battery thermal runaway, the disc (explosion-proof valve) ruptures, and the groove's surrounding design allows for the directional release of high-pressure gas, preventing it from impacting the conductive post.

[0010] Optionally, in an embodiment of this application, the insulating member includes a first surface, and the groove is formed on the first surface. The first surface includes a first surface, a groove surface, and a second surface.

[0011] Optionally, in this embodiment of the application, the insulating element further includes a first metal layer and a second metal layer, wherein the first metal layer is disposed on the first surface and the second metal layer is disposed on the second surface.

[0012] Secondly, embodiments of this application also provide a cover plate assembly, including the insulating member as described above. The cover plate assembly further includes a conductive post, which passes through the through hole and is fixedly connected to the first metal layer.

[0013] Optionally, in an embodiment of this application, the cover plate assembly further includes a disc, a portion of which is disposed within the groove and fixedly connected to the second metal layer.

[0014] Optionally, in this embodiment of the application, the cover plate assembly further includes a positive light cover plate, the positive light cover plate having a first mounting hole, the disc being disposed in the first mounting hole and fixedly connected to the positive light cover plate.

[0015] Optionally, in this embodiment, the conductive post is a positive aluminum post.

[0016] Optionally, in this embodiment of the application, the cover plate assembly further includes a negative light cover plate, the negative light cover plate having a second mounting hole, the disc being disposed in the second mounting hole and fixedly connected to the negative light cover plate.

[0017] Optionally, in this embodiment, the conductive post 20 includes a negative aluminum post and a copper post, the copper post having a third mounting hole, and the negative aluminum post being disposed within the third mounting hole.

[0018] The first metal layer is fixedly connected.

[0019] Optionally, in this embodiment, the copper pillar and the aluminum pillar are interference-fitted.

[0020] Thirdly, embodiments of this application also provide a battery pack, including the cover assembly as described above.

[0021] Fourthly, embodiments of this application also provide a battery pack, including the battery pack as described above.

[0022] Fifthly, embodiments of this application also provide an electrical device, including the battery pack as described above. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the insulating element in the embodiments of this application;

[0024] Figure 2 This is an exploded structural diagram of the negative electrode cover plate in the embodiments of this application;

[0025] Figure 3 This is a top view of the negative electrode cover plate in an embodiment of this application;

[0026] Figure 4 This is an embodiment of the present application. Figure 3 Schematic diagram of the structure at point AA;

[0027] Figure 5 This is an exploded structural diagram of the positive electrode cover plate in an embodiment of this application;

[0028] Figure 6 This is a top view of the positive electrode cover plate in an embodiment of this application;

[0029] Figure 7 This is an embodiment of the present application. Figure 6 A schematic diagram of the structure at point BB.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Insulating component; 11. Through hole; 12. Groove; 13. First surface; 131. First surface; 132. Groove surface; 133. Second surface; 14. First metal surface; 15. Second metal surface; 20. Conductive pillar; 21. Positive aluminum pillar; 22. Negative aluminum pillar; 23. Copper pillar; 30. Disc; 40. Positive light cover plate; 50. Negative light cover plate. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] The insulating components, cover plate assemblies, battery packs, battery modules, and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0035] See Figures 1 to 7 An insulating element 10 is used for a cover plate assembly. The insulating element 10 has a through hole 11 and a groove 12. The groove 12 and the through hole 11 have a preset interval, and the groove 12 is opened around the through hole 11. The through hole 11 is used to accommodate a conductive post 20, and the groove 12 is used to accommodate a disc 30.

[0036] In this embodiment, the through hole 11 can be used to accommodate the positive or negative conductive post, thereby enabling current conduction. The groove 12 is used to accommodate the disc 30. The groove 12 surrounds the through hole 11 and maintains a preset distance from the through hole 11, thus forming a physical isolation zone between the groove 12 and the through hole 11. This effectively isolates the conductive post 20 and the disc 30, preventing interference between them and optimizing space utilization. This embodiment, by using the spaced arrangement of the through hole 11 and groove 12 on the insulating member 10, accommodates the conductive post 20 and the disc 30 within a limited space. After the conductive post 20 and the disc 30 are installed on the insulating member 10, the thickness of the insulating member 10 along its thickness direction is effectively reduced, thereby reducing the space occupied by the battery cell and improving battery energy density.

[0037] It should be noted that the spacing between the groove 12 and the through hole 11 ensures that the disc 30 and the conductive post 20 do not have direct contact, thus avoiding short circuits caused by vibration or thermal expansion. At the same time, in the event of battery thermal runaway, the disc 30 (explosion-proof valve) will rupture, and the surrounding design of the groove 12 allows for the directional release of high-pressure gas, which has the beneficial effect of preventing the disorderly flow of the generated high-pressure gas from impacting the conductive post 20.

[0038] Furthermore, the insulating element 10 can be made of ceramic.

[0039] Optionally, in this embodiment of the application, the insulating member 10 includes a first surface 13, and a groove 12 is formed on the first surface 13. The first surface 13 includes a first surface 131, a groove surface 132, and a second surface 133.

[0040] Furthermore, the insulating element 10 also includes a first metal layer and a second metal layer, the first metal layer being disposed on the first surface 131 and the second metal layer being disposed on the second surface 133.

[0041] In this embodiment, the groove surface 132 is an insulating surface. Since the first surface 131 has a first metal layer and the second surface 133 has a second metal layer, it is understood that the first and second surfaces 131 are conductive, while the groove surface 132 is insulating. In practical applications, the disc 30 can be accommodated within the groove 12. Because the groove surface 132 is insulating, insulation between the disc 30 and the insulating member 10 can be maintained. The first metal layer can be used to connect with the conductive post 20, fixing the conductive post 20 and enabling it to conduct electricity. The second metal layer can be connected with the cover plate to achieve a sealed cover plate assembly. In this embodiment, by setting the first and second metal layers, the problem of the electrode post needing to pass through the cover plate, insulating member 10, and disc 30 in traditional configurations, resulting in increased overall height due to multi-layer stacking and compression of cell space, can be overcome. This has the beneficial effect of improving cell space utilization. The embodiments of this application are particularly suitable for high-energy-density power batteries, directly contributing to improved driving range and safety.

[0042] It should be noted that the main body of the insulating component 10 can be ceramic, and the first metal layer and the second metal layer can be brazed onto the insulating component 10.

[0043] Optionally, in this embodiment of the application, a cover plate assembly is also provided, including the insulating member 10 as described above. The cover plate assembly also includes a conductive post 20, which passes through the through hole 11 and is fixedly connected to the first metal layer.

[0044] In this embodiment, the through-hole 11 can accommodate the conductive post 20, and the conductive post 20 no longer occupies additional space outside the through-hole 11. Furthermore, the conductive post 20 is fixedly connected to the first metal layer. The top of the conductive post 20 can be only slightly higher than the first metal layer. Compared to the conventional arrangement where the conductive post 20 is disposed above the insulating member 10, this embodiment effectively reduces the exposed height of the conductive post 20, thereby reducing the space occupied by the conductive post 20 and having the beneficial effect of improving battery energy density.

[0045] Optionally, in this embodiment of the application, the cover plate assembly further includes a disc 30, a portion of which is disposed within the groove 12 and fixedly connected to the second metal layer.

[0046] In this embodiment, the groove 12 can accommodate the disc 30, and the disc 30 no longer occupies additional space outside the groove 12. Furthermore, the disc 30 is fixedly connected to the second metal layer, and the top of the disc 30 can be only slightly higher than the second metal layer. Compared to the conventional arrangement where the disc 30 is disposed above the insulating member 10, this embodiment effectively reduces the exposed height of the disc 30, thereby reducing the space occupied by the disc 30 and having the beneficial effect of improving battery energy density.

[0047] It should be noted that the cross-section of the disc 30 can be Z-shaped, and the Z-shaped disc 30 can eliminate the stress after connection (brazing).

[0048] Furthermore, in practical applications, the conductive post 20 and the disc 30 are brazed to the first surface 13 of the insulating component 10, but respectively brazed to both sides of the groove 12. Due to the insulation of the groove 12, the conductive post 20 will not conduct with the cover plate, thus preventing a decrease in case pressure. Regarding the working mechanism, current ceramic conductive post 20 structures typically employ a non-grooved insulating component 10, with the conductive post 20 and disc 30 brazed to the inner and outer surfaces of the insulating component 10, resulting in an increase in the height of the conductive post 20. The structure adopted in this application reduces the height of the conductive post 20 by brazing the conductive post 20 and disc 30 to the same surface of the insulating component 10, thus improving the battery energy density.

[0049] Optionally, in this embodiment of the application, the cover plate assembly further includes a positive light cover plate 40, which has a first mounting hole. The disc 30 is disposed in the first mounting hole and is fixedly connected to the positive light cover plate 40.

[0050] In this embodiment, the positive electrode cover plate 40 and the negative electrode cover plate 50 cooperate with each other and, together with the housing, provide space for the battery cell. The positive electrode cover plate 40 has a first mounting hole for fixed connection with the disc 30. Since the disc 30 is connected to the insulating member 10, an indirect connection is achieved between the insulating member 10, the conductive post 20, and the positive electrode cover plate 40. During assembly, the disc 30 is first connected to the positive electrode cover plate 40 by through-welding, then the conductive post 20 is inserted into the through hole 11, and finally the disc 30 is brazed to the ceramic ring, undergoing a final brazing process in a furnace.

[0051] Optionally, in this embodiment, the conductive post 20 is a positive aluminum post 21.

[0052] In this embodiment, the positive electrode cover plate 40 is connected to the positive electrode aluminum pillar 21, and the conductive pillar 20 connected to the positive electrode cover plate 40 no longer needs the copper pillar 23, which has the beneficial effect of reducing the cost of copper raw materials.

[0053] Optionally, in this embodiment of the application, the cover plate assembly further includes a negative light cover plate 50, the negative light cover plate 50 having a second mounting hole, the disc 30 being disposed in the second mounting hole and fixedly connected to the negative light cover plate 50.

[0054] In this embodiment, the negative electrode cover plate 50 has a second mounting hole for fixed connection with the disc 30. Since the disc 30 is connected to the insulating member 10, an indirect connection is achieved between the insulating member 10, the conductive post 20, and the negative electrode cover plate 50. During assembly, the disc 30 is first connected to the negative electrode cover plate 50 by through-welding, then the conductive post 20 is inserted into the through hole 11, and finally the disc 30 is brazed to the ceramic ring. The disc then undergoes a final brazing process in a furnace.

[0055] Optionally, in this embodiment, the conductive post 20 includes a negative aluminum post 22 and a copper post 23. The copper post 23 has a third mounting hole, the negative aluminum post 22 is disposed in the third mounting hole, and the copper post 23 is fixedly connected to the first metal layer.

[0056] In this embodiment of the application, during the assembly process, the disc 30 is first connected to the negative electrode cover plate 50 by penetration welding. After the copper pillar 23 is brazed to the ceramic ring, the negative electrode aluminum pillar 22 is inserted into the third mounting hole of the copper pillar 23. Finally, the disc 30 is brazed to the ceramic ring. After the final brazing process, the negative electrode aluminum pillar 22 will also be more firmly bonded to the copper pillar 23.

[0057] Optionally, in the embodiments of this application, the copper pillar 23 and the negative electrode aluminum pillar 22 are interference-fitted.

[0058] In this embodiment, the interference fit between the copper pillar 23 and the negative electrode aluminum pillar 22 eliminates micro-gaps at the contact surface, enhances structural stability, and also improves the resistance to vibration and loosening between the copper pillar 23 and the negative electrode aluminum pillar 22.

[0059] Optionally, in this embodiment of the application, a battery pack is also provided, including the cover assembly as described above.

[0060] In the embodiments of this application, the battery pack includes a cover assembly, and consequently, all the technical features and beneficial effects of the cover assembly. The battery pack with the aforementioned cover assembly effectively reduces the thickness of the insulating member 10 along the thickness direction, thereby reducing the space occupied by the battery cells and improving the energy density of the battery pack.

[0061] Optionally, in this embodiment of the application, a battery pack is also provided, including the battery pack as described above.

[0062] In the embodiments of this application, the battery pack includes the battery assembly, and consequently all the technical features and beneficial effects of the battery assembly. Further details will not be elaborated here.

[0063] Optionally, in this embodiment of the application, an electrical device is also provided, including the battery pack as described above.

[0064] In this embodiment, the electrical equipment can be a vehicle, ship, or aircraft, as well as various electronic devices or medical devices used in special scenarios. This embodiment does not impose any limitations on these. The electrical equipment includes the battery pack described above and thus possesses all the technical features and beneficial effects of a battery pack, which will not be repeated here.

[0065] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0066] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An insulating element (10) for a cover plate assembly, characterized in that, The insulating component (10) has a through hole (11) and a groove (12), the groove (12) and the through hole (11) have a preset interval, and the groove (12) is opened around the through hole (11); The through hole (11) is used to accommodate the conductive post (20), and the groove (12) is used to accommodate the disc (30).

2. The insulating element (10) according to claim 1, characterized in that, The insulating element (10) includes a first surface (13), and the groove (12) is formed on the first surface (13). The first surface (13) includes a first surface (131), a groove surface (132), and a second surface (133).

3. The insulating element (10) according to claim 2, characterized in that, The insulating element (10) further includes a first metal layer and a second metal layer, the first metal layer being disposed on the first surface (131) and the second metal layer being disposed on the second surface (133).

4. A cover plate assembly comprising the insulating member (10) as described in claim 3, characterized in that, The cover plate assembly also includes a conductive post (20), which passes through the through hole (11) and is fixedly connected to the first metal layer.

5. The cover plate assembly according to claim 4, characterized in that, The cover plate assembly also includes a disc (30), a portion of which is disposed within the groove (12) and is fixedly connected to the second metal layer.

6. The cover plate assembly according to claim 5, characterized in that, The cover plate assembly also includes a positive light cover plate (40), which has a first mounting hole. The disc (30) is disposed in the first mounting hole and is fixedly connected to the positive light cover plate (40).

7. The cover plate assembly according to claim 5, characterized in that, The conductive post (20) is a positive aluminum post (21).

8. The cover plate assembly according to claim 5, characterized in that, The cover plate assembly also includes a negative light cover plate (50), which has a second mounting hole. The disc (30) is disposed in the second mounting hole and is fixedly connected to the negative light cover plate (50).

9. The cover plate assembly according to claim 7, characterized in that, The conductive post (20) includes a negative aluminum post (22) and a copper post (23). The copper post (23) has a third mounting hole. The negative aluminum post (22) is disposed in the third mounting hole. The copper post (23) is fixedly connected to the first metal layer.

10. The cover plate assembly according to claim 9, characterized in that, The copper pillar (23) and the negative electrode aluminum pillar (22) are interference-fitted.

11. A battery pack, characterized in that, Includes the cover plate assembly as described in any one of claims 4-10.

12. A battery pack, characterized in that, Includes the battery pack as described in claim 11.

13. An electrical appliance, characterized in that, Includes the battery pack as described in claim 12.

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