Battery cover plate based on ceramic sealing process

Abstract

This invention discloses a battery cover plate based on ceramic sealing technology, aiming to solve the problems of insufficient welding area and aging and detachment of welded parts in the prior art. The key technical points are: it includes a cover plate and a terminal post structure. The cover plate has terminal post mounting holes. The terminal post structure includes a current-passing block, a terminal post, a ceramic ring, and a first insulating component. The current-passing block has a protrusion, several riveting holes, and a limiting part. The first insulating component is disposed between the terminal post mounting holes and the current-passing block. The ceramic ring is fixedly attached to the inner surface of the cover plate and surrounds the terminal post mounting holes. The terminal post is attached to the ceramic ring and completely seals the terminal post mounting holes. Several riveting posts protrude from the terminal post, and the riveting posts are riveted to the riveting holes. Simultaneously, the protrusion is welded to the terminal post. The inner surface of the cover plate is also covered with a second insulating component, which has terminal post exposure openings.

Description

Technical Field

[0001] This invention relates to a battery cover, and more specifically, to a battery cover based on a ceramic sealing process. Background Technology

[0002] With the rapid iteration of power battery technology, power batteries have been widely used in new energy vehicles, energy storage systems and other fields. As the market demand for power battery range and energy replenishment efficiency continues to increase, cell capacity continues to increase and charging rate is also developing towards a higher level, becoming one of the core trends in industry development.

[0003] Currently, the commonly used charging rates for battery cells in the industry are typically 3C and 5C, which can basically meet the needs of conventional applications. However, with the further increase in battery cell capacity and the urgent needs of scenarios such as fast charging for new energy vehicles and efficient energy replenishment for energy storage systems, battery cell charging rates are gradually developing towards 10C, 12C, and higher levels. The increase in charging rate results in a significant increase in current during the operation of the battery cell, placing more stringent requirements on the overcurrent capacity of the battery cell and related components.

[0004] As a key conductive connection component connecting to the terminal, the welding area between the adapter plate and the terminal is a core factor affecting the overall overcurrent efficiency. When the welding area between the adapter plate and the terminal is insufficient, the contact resistance will increase. According to Joule's law, the heat generated is proportional to the square of the current. Excessive contact resistance will cause significant heat generation, which will not only reduce the energy transfer efficiency of the battery, but may also cause the weld to age and fall off due to long-term overheating, or even cause thermal runaway of the cell, seriously affecting the safety and service life of the power battery.

[0005] As a key packaging component of power batteries, the top cover's terminals serve as crucial interfaces connecting the battery cells to external circuits. The welding area of ​​these terminals is directly limited by the top cover's structure and manufacturing process. Existing traditional top covers, due to their unreasonable structural design and manufacturing limitations, severely restrict the weldable area of ​​the terminals. With limited top cover dimensions, a sufficiently large welding area between the adapter plate and the terminals cannot be achieved, thus failing to meet the overcurrent requirements for high-current transmission at high charging rates. This becomes a key technological bottleneck restricting the improvement of battery cell charging rates and capacity. Furthermore, the welded joints between the terminals and adapter plates exhibit slow aging. Conventional connections between terminals and adapter plates, relying solely on welding, are prone to detachment and separation later on.

[0006] In summary, as the charging rate of power batteries develops towards 10C, 12C and above, the contradiction between the overcurrent demand brought about by the increase in current and the limited welding area of ​​the traditional top cover terminals is becoming increasingly prominent. The traditional top cover can no longer meet the needs of high-rate and large-capacity battery cells. There is an urgent need for a top cover structure that can increase the welding area of ​​the terminals and improve the connection strength in order to solve the above-mentioned defects of the existing technology and promote the continuous development of the power battery industry towards high-rate and large-capacity. Summary of the Invention

[0007] This invention provides a battery cover plate based on ceramic sealing technology, which solves the problems of insufficient welding area of ​​the electrode post and aging and detachment of the welding parts in the prior art.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a battery cover plate based on ceramic sealing technology, comprising a cover plate and a terminal post structure, wherein a through terminal post mounting hole is formed on the cover plate, and the terminal post structure is disposed in the terminal post mounting hole, the terminal post structure comprising a current-passing block, a terminal post, a ceramic ring, and a first insulating member; the current-passing block is provided with a protrusion, a plurality of riveting holes, and a limiting part, the protrusion extending from one side of the outer surface of the cover plate into the terminal post mounting hole; the first insulating member is disposed between the terminal post mounting hole and the current-passing block, so that the two are completely insulated; the ceramic ring is fixedly attached to the inner surface of the cover plate and surrounds the terminal post. The electrode is fitted onto the ceramic ring and the electrode mounting hole is completely sealed. The electrode has a plurality of protruding rivets that correspond one-to-one with the rivet holes. The rivets are riveted and fixed to the rivet holes, so that the first insulating member, the cover plate and the ceramic ring are tightly clamped by the limiting part and the outer edge of the electrode. At the same time, the protruding part is welded to the electrode. The gaps formed between the ceramic ring and the cover plate and between the ceramic ring and the electrode are sealed by a metal powder cold spray process. The inner surface of the cover plate is also covered with a second insulating member, which has an electrode exposure port that exposes the electrode.

[0009] This invention achieves a tight and secure connection between the electrode post and the current flow block by providing a riveting post on the electrode post and a riveting hole on the current flow block. The welded area between the protrusion and the electrode post primarily serves a conductive function, and external stress is largely not transmitted to this area, thus reducing the likelihood of aging and detachment. Furthermore, the multi-layered structure of the electrode post, clamped by the limiting part and the outer edge of the electrode post, achieves a tight fit. Only the first insulating element is clamped between the electrode post mounting hole and the protrusion on the current flow block. Therefore, most of the space within the electrode post mounting hole is used to accommodate the protrusion. For electrode post mounting holes of the same size, the welding area between the protrusion and the electrode post is significantly larger using the assembly process of this invention.

[0010] Furthermore, the ceramic ring not only enhances the overall structural seal but also effectively prevents corrosion of the connection between the terminal and the cover plate by electrolyte or other external substances. By using a cold-spraying process to seal the gaps between the ceramic ring and the cover plate, and between the ceramic ring and the terminal, a dense sealing coating is formed in the corresponding areas, further improving the sealing effect. This sealing design is particularly suitable for high-rate charging scenarios, as the localized heating caused by increased current will not lead to aging of the ceramic ring.

[0011] The second insulating component is generally made of plastic material, which can be efficiently bonded to the cover plate through a hot melt process, eliminating the relatively troublesome mylar film welding process.

[0012] Furthermore, the ceramic ring is made of transparent ceramic material. When laser energy is applied to one side of the ceramic ring, the laser energy passes through the transparent ceramic, allowing for laser welding of the contact area between the ceramic ring and the cover plate, thus achieving a fixed connection.

[0013] Furthermore, a first positioning groove is formed on the inner surface of the cover plate corresponding to the position of the electrode mounting hole, and the ceramic ring is embedded in the first positioning groove; the ceramic ring is provided with a second positioning groove, and the electrode is embedded in the second positioning groove. This can enhance the guiding and positioning effect of the corresponding assembly parts, and also helps to reduce the protrusion size of the electrode structure on the inner side of the cover plate, realizing the ultimate space inside the battery case and ensuring the maximum capacity of the cell.

[0014] Furthermore, the electrode structure has two parts: a positive electrode structure and a negative electrode structure; the electrode corresponding to the positive electrode structure is made of aluminum, and the electrode corresponding to the negative electrode structure is made of copper.

[0015] Furthermore, the cover plate is also provided with an injection hole, and a plug is provided inside the injection hole. The second insulating component is provided with a leakage hole that communicates with the injection hole.

[0016] Furthermore, the cover plate is also provided with an explosion-proof valve, which includes a pressure relief hole through the cover plate, a membrane covering and adhering to the outside of the pressure relief hole, and a valve plate covering and adhering to the inside of the pressure relief hole. The membrane is provided with breathable micropores, and the valve plate is provided with engravings. The second insulating member is provided with a breathable hole communicating with the valve plate.

[0017] In summary, the present invention also has the following beneficial effects: 1. The electrode and the current block are tightly riveted together. The welded part between the protrusion and the electrode mainly serves to conduct electricity. External stress is basically not transmitted to this part, so the welded part is not prone to aging and falling off. 2. Most of the space inside the pole mounting hole is used to accommodate the protrusion. When the pole mounting hole of the same size is used with the assembly process of this invention, the welding area between the protrusion and the pole is significantly larger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the outer surface structure of the present invention; Figure 2 This is a schematic diagram of the inner surface structure of the present invention; Figure 3 A cross-sectional view of the region where the pole post structure is installed in this invention; Figure 4 This is a disassembled diagram of the pole structure; Figure 5 A cross-sectional view of the area where the explosion-proof valve is installed in this invention; Figure 6 This is a schematic diagram of the structure of the first insulating component; Figure 7 This is a magnified view of a portion of the diaphragm and valve plate.

[0019] Explanation of reference numerals in the attached figures: 10. Cover plate; 11. Terminal mounting hole; 12. First positioning groove; 13. Second through hole; 14. Injection hole; 15. Plug; 16. Boss; 100. Terminal structure; 101. Positive terminal structure; 102. Negative terminal structure; 20. Flow block; 21. Protrusion; 22. Riveting hole; 23. Limiting part; 24. Riveting groove; 30. Terminal; 31. Riveting post; 40. Ceramic ring; 41. Second positioning groove; 42. First through hole; 50. First insulating component; 51. Third through hole; 52. Insulating sleeve; 60. Second insulating component; 61. Terminal exposed opening; 62. Leakage hole; 63. Vent hole; 70. Explosion-proof valve; 71. Pressure relief hole; 72. Membrane; 73. Valve plate; 74. Micropore; 75. Score. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "set up / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example: A battery cover plate based on ceramic sealing technology includes a cover plate 10 and two terminal post structures 100, namely a positive terminal post structure 101 and a negative terminal post structure 102. Two through-holes 11 are formed on the cover plate 10, with an approximately rectangular outline. The cover plate 10 is generally made of aluminum. The two terminal post structures 100 are fixedly installed in the two terminal post mounting holes 11. Each terminal post structure 100 includes a current-passing block 20, a terminal post 30, a ceramic ring 40, and a first insulating element. 50. The current-carrying block 20 is an aluminum block; the current-carrying block 20 is provided with a protrusion 21, four riveting holes 22 and a limiting part 23. The protrusion 21 extends from one side of the outer surface of the cover plate 10 into the pole mounting hole 11, and the limiting part 23 is arranged around the current-carrying block 20; the first insulating member 50 is a ring structure, and the first insulating member 50 is arranged between the pole mounting hole 11 and the current-carrying block 20, so that the two are completely insulated; the ceramic ring 40 is a transparent ceramic, and the ceramic ring 40 is fixedly attached to the... The inner surface of the cover plate 10 surrounds the electrode mounting hole 11; the electrode 30 corresponding to the positive electrode structure 101 is made of aluminum, and the electrode 30 corresponding to the negative electrode structure 102 is made of copper. The electrode 30 is attached to the ceramic ring 40 and completely seals the electrode mounting hole 11. The electrode 30 has four protruding rivets 31 that correspond one-to-one with the rivet holes 22. The rivets 31 are riveted and fixed to the rivet holes 22, so that the first insulating part 50, the cover plate 10 and the ceramic ring 40 are limited by the limiting part 23. The outer edge of the electrode post 30 is tightly clamped, and the protrusion 21 is welded to the electrode post 30. The gaps formed between the ceramic ring 40 and the cover plate 10, and the gaps formed between the ceramic ring 40 and the electrode post 30 are all sealed by a metal powder cold spraying process, that is, the gaps are fully filled by the metal powder cold spraying process to achieve sealing. The inner surface of the cover plate 10 is also covered with a second insulating element 60, and the second insulating element 60 is provided with an electrode post exposure port 61 for exposing the electrode post 30.

[0025] Specifically, both the first insulating component 50 and the second insulating component 60 are made of plastic and can be produced by injection molding.

[0026] Specifically, a first positioning groove 12 is formed on the inner surface of the cover plate 10 at the position corresponding to the terminal mounting hole 11, and the ceramic ring 40 is embedded in the first positioning groove 12; the ceramic ring 40 is provided with a second positioning groove 41, and the terminal 30 is embedded in the second positioning groove 41. This can enhance the guiding and positioning effect of the corresponding assembly parts, and help reduce the protrusion size of the terminal structure 100 on the inner side of the cover plate 10, realize the ultimate space inside the battery case, ensure the maximum capacity of the cell, and the outer peripheral wall of the ceramic ring 40 is tightly fitted with the inner peripheral wall of the first positioning groove 12, and the outer peripheral wall of the terminal 30 is tightly fitted with the inner peripheral wall of the second positioning groove 41, so as to achieve tight positioning of the ceramic ring 40 and the terminal 30 and prevent lateral displacement.

[0027] The ceramic ring 40 has a first through hole 42 corresponding to the riveting post 31, the cover plate 10 has a second through hole 13 corresponding to the riveting post 31, and the first insulating member 50 has a third through hole 51 corresponding to the riveting post 31. The riveting post 31 passes through the ceramic ring 40, the cover plate 10, the first insulating member 50, and the current block 20 in sequence. An annular gap is formed between the second through hole 13 and the riveting post 31. The first insulating member 50 is also provided with an insulating sleeve 52 that penetrates the annular gap. The current block 20, the pole post 30, the ceramic ring 40, and the first insulating member 50 are tightly connected in series by the riveting post 31, resulting in better overall integrity and reducing the likelihood of loosening. The insulating sleeve 52 serves to insulate the riveting post 31 from the cover plate 10 and to position the first insulating member 50, while also providing tight positioning for the riveting post 31.

[0028] Specifically, the cover plate 10 has a raised boss 16 surrounding the pole mounting hole 11. The first insulating member 50 has an inner side flange 53 distributed along its inner contour and an outer side flange 54 distributed along its outer contour. An assembly groove 55 is defined between the inner side flange 53 and the outer side flange 54 to engage with the boss 16. The third through hole 51 and the insulating sleeve 52 are both located in the assembly groove 55. The first insulating member 50, the insulating sleeve 52, the outer side flange 54 and the inner side flange 53 are combined into a single plastic structure. The boss 16 is an annular structure adapted to the first insulating member 50. The outer side flange 54 and the inner side flange 53 are also annular structures. The setting of the outer side flange 54 and the inner side flange 53 makes the positioning of the first insulating member 50 more stable and reliable after it is positioned on the boss 16, avoiding displacement.

[0029] Specifically, the cover plate 10 is also provided with an injection hole 14, and a plug 15 is provided inside the injection hole 14. The second insulating component 60 is provided with a leakage hole 62 that communicates with the injection hole 14.

[0030] Specifically, the cover plate 10 is also provided with an explosion-proof valve 70. The explosion-proof valve 70 includes a pressure relief hole 71 that passes through the cover plate 10, a membrane 72 that covers and adheres to the outside of the pressure relief hole 71, and a valve plate 73 that covers and adheres to the inside of the pressure relief hole 71. The membrane 72 is provided with breathable micropores 74, and the valve plate 73 is provided with grooves 75. The second insulating member 60 is provided with a vent hole 63 that communicates with the valve plate 73.

[0031] Specifically, the outer surface of the flow block 20 is provided with riveting grooves 24 corresponding one-to-one with the riveting holes 22. The end of the riveting post 31 located in the riveting groove 24 is deformed by riveting to form a riveting joint, and the riveting joint and the riveting groove 24 are interference fit; the riveting groove 24 is used to accommodate the enlarged structure of the head of the riveting post 31 so that the riveting post 31 is reliably fixed on the flow block 20, and the connection between the flow block 20 and the pole post 30 after riveting and welding is more secure.

[0032] Preferably, the current-carrying block 20, the terminal mounting hole 11, the terminal 30, the ceramic ring 40, the protrusion 21, and the first insulating element 50 are all rectangular, but the current-carrying block 20, the terminal mounting hole 11, the terminal 30, and the ceramic ring 40 can also be made circular according to actual needs.

[0033] This embodiment is specifically manufactured and assembled using the following production process: First, laser engraving is performed on the cover plate 10, and the explosion-proof valve 70 is welded into place. Then, the transparent ceramic ring 40 is installed into the first positioning groove 12, ensuring that the first through hole 42 and the second through hole 13 are aligned, and laser welding is performed to obtain the semi-finished cover plate 10. Next, the positive / negative electrode structure is assembled by aligning and assembling the current block 20 and the first insulating component 50, ensuring that the third through hole 51 and the riveting hole 22 are aligned. Then, the assembly is placed into the electrode mounting hole 11 on the semi-finished cover plate 10, ensuring that the third through hole 51 and the second through hole 13 are aligned. First, align the corresponding pole 30 and then insert it into the second positioning groove 41. Weld the pole 30 to the protrusion 21. After welding, rivet the pole 31 and then rivet it. Then, cold spray metal powder into the gap between the ceramic ring 40 and the cover plate 10 and the gap between the ceramic ring 40 and the pole 30. At this point, the assembly of the positive / negative pole structure is completed. Then, heat-melt the second insulating part 60 onto the inner surface of the cover plate 10 and perform leveling. Then, perform helium detection, automatic inspection + film application, and appearance inspection in sequence, and finally put it into the warehouse.

[0034] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A battery cover plate based on ceramic sealing technology, comprising a cover plate (10) and a terminal post structure (100), wherein a through terminal post mounting hole (11) is formed on the cover plate (10), and the terminal post structure (100) is disposed within the terminal post mounting hole (11), characterized in that: The electrode structure (100) includes a flow block (20), an electrode (30), a ceramic ring (40), and a first insulating element (50). The flow block (20) has a protrusion (21), several riveting holes (22), and a limiting part (23). The protrusion (21) extends from one side of the outer surface of the cover plate (10) into the electrode mounting hole (11). The first insulating element (50) is disposed between the electrode mounting hole (11) and the flow block (20), so that the two are completely insulated. The ceramic ring (40) is fixedly attached to the inner surface of the cover plate (10) and surrounds the electrode mounting hole (11). The electrode (30) is attached to the ceramic ring (40). The electrode mounting hole (11) is completely sealed. The electrode (30) has a plurality of protruding rivets (31) that correspond one-to-one with the rivet holes (22). The rivets (31) are riveted and fixed to the rivet holes (22), so that the first insulating part (50), the cover plate (10) and the ceramic ring (40) are tightly clamped by the limiting part (23) and the outer edge of the electrode (30). At the same time, the protruding part (21) is welded to the electrode (30). The gap between the ceramic ring (40) and the cover plate (10) and the gap between the ceramic ring (40) and the electrode (30) are sealed by a metal powder cold spray process.

2. The battery cover plate based on ceramic sealing technology according to claim 1, characterized in that: The ceramic ring (40) is made of transparent ceramic material, and the contact area between the ceramic ring (40) and the cover plate (10) is fixedly connected by laser welding process.

3. The battery cover plate based on ceramic sealing technology according to claim 2, characterized in that: A first positioning groove (12) is formed on the inner surface of the cover plate (10) corresponding to the position of the pole mounting hole (11), and the ceramic ring (40) is embedded in the first positioning groove (12).

4. The battery cover plate based on ceramic sealing technology according to claim 2, characterized in that: The ceramic ring (40) is provided with a second positioning groove (41), and the pole post (30) is embedded in the second positioning groove (41).

5. The battery cover plate based on ceramic sealing technology according to claim 1, characterized in that: The inner surface of the cover plate (10) is also covered with a second insulating member (60), which has an electrode exposure port (61) for exposing the electrode (30).

6. The battery cover plate based on ceramic sealing technology according to claim 1, characterized in that: The ceramic ring (40) is provided with a first through hole (42) corresponding to the riveting post (31), the cover plate (10) is provided with a second through hole (13) corresponding to the riveting post (31), the first insulating component (50) is provided with a third through hole (51) corresponding to the riveting post (31), the riveting post (31) passes through the first through hole (42), the second through hole (13), the third through hole (51) and the riveting hole in sequence and is riveted to the flow block (20), an annular gap is formed between the second through hole (13) and the riveting post (31), and the first insulating component (50) is also provided with an insulating sleeve (52) that penetrates the annular gap.

7. The battery cover plate based on ceramic sealing technology according to claim 1, characterized in that: The electrode structure (100) has two parts, namely a positive electrode structure (101) and a negative electrode structure (102); the electrode (30) corresponding to the positive electrode structure (101) is made of aluminum, and the electrode (30) corresponding to the negative electrode structure (102) is made of copper.

8. The battery cover plate based on ceramic sealing technology according to claim 6, characterized in that: The cover plate (10) has a raised boss (16) surrounding the pole mounting hole (11). The first insulating member (50) has an inner side flange (53) distributed along its inner contour and an outer side flange (54) distributed along its outer contour. An assembly groove (55) is defined between the inner side flange (53) and the outer side flange (54) to engage with the boss (16). The third through hole (51) and the insulating sleeve (52) are both located in the assembly groove (55).

9. The battery cover plate based on ceramic sealing technology according to claim 6, characterized in that: The outer surface of the flow block (20) is provided with a riveting groove (24) corresponding to the riveting hole (22). The end of the riveting post (31) located in the riveting groove (24) is deformed by riveting to form a riveting joint. The riveting joint and the riveting groove (24) are interference fit.

10. The battery cover plate based on ceramic sealing technology according to claim 5, characterized in that: The cover plate (10) is also provided with an explosion-proof valve (70). The explosion-proof valve (70) includes a pressure relief hole (71) that passes through the cover plate (10), a membrane (72) that covers and adheres to the outside of the pressure relief hole (71), and a valve plate (73) that covers and adheres to the inside of the pressure relief hole (71). The membrane (72) is provided with breathable micropores (74), and the valve plate (73) is provided with grooves (75). The second insulating member (60) is provided with a breathable hole (63) that communicates with the valve plate (73).

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