Cover plate assembly and battery cell

Abstract

The application discloses a cover plate assembly and a battery cell. The cover plate assembly comprises a cover plate, a mounting bracket and a pole post assembly. The mounting bracket is connected to one side of the cover plate. The pole post assembly comprises a pole post and an electrical connector. One end of the pole post is connected to the electrical connector through the cover plate and the mounting bracket from the side of the cover plate away from the mounting bracket. The other end of the pole post is formed into a flat welding surface. The center line of the electrical connector along the thickness direction of the cover plate is arranged in a staggered manner with the center line of the pole post along the thickness direction of the cover plate in the plane where the cover plate is located. In this way, the welding area of the bus bar can be increased, the bus bar can be adapted to different battery cell spacings, the assembly alignment difficulty of the bus bar is reduced, and the assembly consistency and electrical connection reliability are improved. Through the eccentric arrangement of the pole post and the electrical connector, the flexible offset of the electrical connector is realized, the reserved amount of the staggered pole ear is increased, the fault tolerance of the winding process is improved, the process yield of the battery cell is improved while the battery cell meets the large-capacity overcurrent demand, and the reliability of the battery cell is improved.

Description

Technical Field

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

[0002] In the prior art, the terminal assembly includes the terminal and the electrical connector. The terminal and the battery cover are usually riveted together in the forward direction. Large-sized riveting holes are generally opened on the top of the terminal, which makes it impossible to form a flat welding surface on the top of the terminal, reducing the welding area of ​​the bus. In addition, the electrical connector is usually fixed vertically and centered to the center of the terminal, which cannot achieve flexible offset adjustment. During the winding process, the tabs are prone to misalignment, which makes the battery cell unable to meet the high-capacity overcurrent requirements and reduces the process yield of the battery cell. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a cover plate assembly that enables the battery cell to meet the high-capacity overcurrent requirements while improving the battery cell manufacturing yield.

[0004] A second objective of the present invention is to provide a battery cell comprising the cover plate assembly described in the above embodiments.

[0005] According to a first aspect of the present invention, the cover plate assembly includes: a cover plate, a mounting bracket, and a pole assembly, wherein the mounting bracket is connected to one side of the cover plate; the pole assembly includes a pole and an electrical connector, wherein the electrical connector is disposed on the side of the mounting bracket away from the cover plate, one end of the pole passes through the cover plate and the mounting bracket from the side of the cover plate away from the mounting bracket and is connected to the electrical connector, the other end of the pole is formed as a flat welding surface, and the center line of the electrical connector along the thickness direction of the cover plate and the center line of the pole along the thickness direction of the cover plate are offset in the plane where the cover plate is located.

[0006] According to the cover plate assembly of the present invention, the design of forming a flat welding surface at the end of the pole away from the electrical connector effectively increases the welding area of ​​the busbar, resulting in a large conductive cross-sectional area and low heat generation. This allows the busbar to adapt to different cell spacings, reduces the difficulty of busbar assembly alignment, and improves assembly consistency and electrical connection reliability. The staggered centerline setting of the electrical connector and the pole, i.e., the eccentric setting of the pole and the electrical connector, enables flexible misalignment of the electrical connector, improving the compatibility and adaptability of the cover plate assembly. This allows for precise welding of the tabs to the electrical connectors, increases the allowable misalignment of the winding tabs, and effectively improves the tolerance of the winding process. Therefore, while meeting the high-capacity overcurrent requirements of the cell, it can improve the cell manufacturing yield and enhance the cell reliability.

[0007] In some embodiments, the electrical connector has a mounting hole extending through the thickness direction of the cover plate, the central axis of the mounting hole being offset from the center line of the electrical connector along the thickness direction of the cover plate in the plane of the cover plate, and one end of the pole being riveted to the electrical connector through the mounting hole.

[0008] In some embodiments, the pole includes: a first pole segment and a second pole segment, the first pole segment being located on the side of the cover plate away from the mounting bracket; the second pole segment being connected to the first pole segment, the second pole segment passing through the cover plate and the mounting bracket and being connected to the electrical connector, and the cross-sectional area of ​​the first pole segment being larger than the cross-sectional area of ​​the second pole segment.

[0009] In some embodiments, the sidewall of the mounting hole is provided with a protrusion that extends circumferentially along the mounting hole; the second pole segment includes: a first sub-pole segment, a second sub-pole segment, and a connecting segment, wherein the first sub-pole segment is connected to the first pole segment; the second sub-pole segment is located on the side of the first sub-pole segment away from the first pole segment, and the second sub-pole segment is connected to the electrical connector; the connecting segment is connected between the first sub-pole segment and the second sub-pole segment, and the cross-sectional area of ​​the connecting segment is smaller than the cross-sectional area of ​​the first sub-pole segment and smaller than the cross-sectional area of ​​the second sub-pole segment, so as to define a mating groove together with the first sub-pole segment and the second sub-pole segment, and the protrusion is fitted into the mating groove.

[0010] In some embodiments, the cross-sectional area of ​​the second pole segment adjacent to one end of the first pole segment is greater than the cross-sectional area of ​​the other end of the second pole segment away from the first pole segment, and at least a portion of the second pole segment adjacent to the first pole segment is disposed between the cover plate and the first pole segment.

[0011] In some embodiments, a groove is formed on the second sub-pole segment, the groove being recessed from the side surface of the second sub-pole segment away from the cover plate to the connection point between the second sub-pole segment and the connecting segment.

[0012] In some embodiments, when the electrode is a positive electrode, the first electrode segment and the second electrode segment are made of the same material, and the electrode is a one-piece molded part; when the electrode is a negative electrode, the first electrode segment and the second electrode segment are made of different materials.

[0013] In some embodiments, when the electrode is a negative electrode, the first electrode segment is an aluminum component and the second electrode segment is a copper component.

[0014] In some embodiments, the electrode assembly includes a positive electrode assembly and a negative electrode assembly, which are spaced apart along the length of the cover plate. One end of each electrode of the positive and negative electrode assemblies passes through the cover plate and the mounting bracket from the side of the cover plate away from the mounting bracket and connects to the electrical connector. The other end of each electrode is formed as a flat welding surface. The electrical connectors of the positive and negative electrode assemblies are located along the centerline of the thickness direction of the cover plate on the side adjacent to the center of the corresponding electrode centerline in the length direction of the cover plate.

[0015] In some embodiments, the cover plate has at least one pressing groove on the side adjacent to the mounting bracket, and the mounting bracket has at least one pressing part on the side adjacent to the cover plate, the pressing part cooperating with the pressing groove.

[0016] In some embodiments, the pressing groove is formed openly towards one side of the mounting bracket along the thickness direction of the cover plate, and the cross-sectional area of ​​the pressing groove gradually decreases along the thickness direction of the cover plate and towards the mounting bracket.

[0017] In some embodiments, along the thickness direction of the cover plate, the cross-sectional area of ​​the pressing portion gradually decreases from the center to both ends; a portion of at least one side surface of the pressing portion is formed as a mating surface, the mating surface being disposed on the side of the at least one side surface adjacent to the mounting bracket; and / or, a portion of at least one side surface of the pressing portion is formed as a guide surface, the guide surface being disposed on the side of the at least one side surface away from the mounting bracket.

[0018] In some embodiments, the mating surface and the guide surface are connected to each other, and the ends of the mating surface and the guide surface away from each other gradually extend at an inclination toward the center of the pressing portion along the thickness direction of the cover plate.

[0019] In some embodiments, there are multiple pressing portions, which are symmetrically arranged adjacent to each other.

[0020] In some embodiments, the cover assembly further includes a high-temperature protection element disposed on the side of the mounting bracket facing the cover, the high-temperature protection element being configured to withstand a maximum temperature greater than the maximum temperature that the mounting bracket can withstand.

[0021] In some embodiments, the mounting bracket has an assembly protrusion on the side away from the cover plate, and an assembly groove is formed on the assembly protrusion, with the high-temperature protective component fitting into the assembly groove.

[0022] In some embodiments, the high-temperature protective component includes: a plurality of first high-temperature protective components and second high-temperature protective components, wherein the plurality of first high-temperature protective components are respectively disposed at both ends of the mounting bracket along the length direction of the cover plate; the second high-temperature protective component is disposed in the middle of the mounting bracket and is located between the plurality of first high-temperature protective components.

[0023] In some embodiments, the first high-temperature protective member has a plurality of first through holes spaced apart along the width direction of the cover plate, the first through holes being elongated holes extending along the length direction of the cover plate, the width of the first through holes in the width direction of the cover plate being greater than the spacing between two adjacent first through holes; and / or, the second high-temperature protective member has a second through hole and a plurality of third through holes, the second through hole being adapted to avoid an explosion-proof valve, the plurality of third through holes being located on both sides of the second through hole along the width direction of the cover plate, and the plurality of third through holes being spaced apart along the length direction of the cover plate.

[0024] In some embodiments, the high-temperature protective component is a ceramic component.

[0025] The battery cell according to a second aspect of the present invention includes the cover plate assembly described in any of the above embodiments.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a cover plate assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a cover plate assembly according to an embodiment of the present invention from another perspective; Figure 3 This is an exploded view of a cover plate assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the negative electrode post according to an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of a cover plate assembly according to an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged schematic diagram of the mid-Q region; Figure 7 This is a longitudinal cross-sectional schematic diagram of a cover plate assembly according to an embodiment of the present invention; Figure 8 yes Figure 7 Enlarged schematic diagram of region P in the middle; Figure 9 This is a schematic diagram of the first high-temperature protective component according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the second high-temperature protective component according to an embodiment of the present invention.

[0028] Figure label: 100. Cover plate assembly; 10. Cover plate; 11. Pressing groove; 12. Mating hole; 13. Explosion-proof valve; 14. Explosion-proof valve protective film; 20. Mounting bracket; 21. Pressing part; 22. Mating surface; 23. Guide surface; 24. Assembly protrusion; 25. Assembly groove; 30. Terminal assembly; 31. Terminal; 32. First terminal section; 33. Second terminal section; 331. First sub-terminal section; 332. Second sub-terminal section; 333. Connecting section; 34. Electrical connector; 35. Mounting hole; 36. Protrusion; 37. Mating groove; 38. Groove; 40. Positive terminal; 41. Negative terminal; 42. Positive terminal assembly; 43. Negative terminal assembly; 44. Seal; 45. Upper bracket; 50. High-temperature protective component; 51. First high-temperature protective component; 511. First through hole; 52. Second high-temperature protective component; 521. Second through hole; 522. Third through hole. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-10 A cover plate assembly 100 according to an embodiment of the present invention is described. The cover plate assembly 100 includes: a cover plate 10, a mounting bracket 20, and a pole post assembly 30.

[0030] Specifically, such as Figure 1 and Figure 2 As shown, the mounting bracket 20 is connected to one side of the cover plate 10. The pole assembly 30 includes a pole 31 and an electrical connector 34. The electrical connector 34 is located on the side of the mounting bracket 20 away from the cover plate 10. One end of the pole 31 passes through the cover plate 10 and the mounting bracket 20 from the side of the cover plate 10 away from the mounting bracket 20 and is connected to the electrical connector 34. The other end of the pole 31 is formed as a flat welding surface. The center line of the electrical connector 34 along the thickness direction of the cover plate 10 and the center line of the pole 31 along the thickness direction of the cover plate 10 are offset in the plane where the cover plate 10 is located.

[0031] In this application, the cover plate assembly 100 is suitable for sealing the electrolyte and electrode assembly inside the battery cell, preventing electrolyte evaporation and blocking external air and moisture from entering the battery cell. The cover plate assembly 100 includes a cover plate 10, a mounting bracket 20, and an electrode post assembly 30. The cover plate 10 and the mounting bracket 20 are opposite each other along the thickness direction of the cover plate 10, and the mounting bracket 20 is connected to the side of the cover plate 10 adjacent to the electrode assembly. Optionally, the mounting bracket 20 is made of insulating plastic. The electrical connector 34 is located on the side of the mounting bracket 20 away from the cover plate 10 along the thickness direction of the cover plate 10. In the thickness direction of the cover plate 10, one end of the electrode post 31 adjacent to the electrode assembly passes through the cover plate 10 and the mounting bracket 20 in sequence and is connected to the electrical connector 34. The other end of the electrode post 31 away from the electrode assembly is located on the side of the cover plate 10 away from the mounting bracket 20. Optionally, the other end of the pole post 31, that is, the top of the pole post 31, is not damaged by riveting and compression, forming a complete, flat and dimensionally stable plane, namely a flat welding surface. The flat welding surface is located entirely on the side of the cover plate 10 away from the mounting bracket 20. The flat welding surface can be used entirely for welding with the busbar, thereby increasing the welding area of ​​the busbar.

[0032] The center line of the electrical connector 34 and the center line of the pole post 31 both extend along the thickness direction of the cover plate 10, and the center lines of the electrical connector 34 and the pole post 31 are staggered along the length direction of the cover plate 10, so that the pole post 31 and the electrical connector 34 are eccentrically set. The electrical connector 34 is connected to the pole post 31 and the pole tab of the pole group respectively. The current of the pole group can flow to the busbar through the electrical connector 34 and the pole post 31 to realize current conduction.

[0033] According to the cover plate assembly 100 of the present invention, the design of forming a flat welding surface at the end of the pole 31 away from the electrical connector 34 can effectively increase the welding area of ​​the busbar, resulting in a large conductive cross-sectional area and low heat generation. This allows the busbar to adapt to different cell spacings, reduces the difficulty of busbar assembly alignment, and improves assembly consistency and electrical connection reliability. The staggered centerline setting of the electrical connector 34 and the pole 31, i.e., the eccentric setting of the pole 31 and the electrical connector 34, allows for flexible offset of the electrical connector 34, improving the compatibility and adaptability of the cover plate assembly 100. This enables precise welding of the tabs to the electrical connector 34, increases the allowable misalignment of the winding tabs, and effectively improves the tolerance of the winding process. Therefore, while meeting the high-capacity overcurrent requirements of the cells, it can improve the cell manufacturing yield and enhance the reliability of the cells.

[0034] Optionally, the welding area between the terminal post 31 and the busbar can be increased by more than 60% to meet the overcurrent requirements of a 588Ah high-capacity battery cell.

[0035] According to some embodiments of the present invention, such as Figure 2 and Figure 3As shown, the electrical connector 34 has a mounting hole 35 that extends through the thickness direction of the cover plate 10. The central axis of the mounting hole 35 is offset from the center line of the electrical connector 34 along the thickness direction of the cover plate 10 in the plane of the cover plate 10. One end of the pole post 31 is riveted to the electrical connector 34 through the mounting hole 35.

[0036] The mounting hole 35 passes through the electrical connector 34 along the thickness direction of the cover plate 10. The central axis of the mounting hole 35 coincides with the center line of the pole post 31, and the central axis of the mounting hole 35 and the center line of the electrical connector 34 are offset along the length direction of the cover plate 10. The end of the pole post 31 adjacent to the pole group is sequentially connected through the cover plate 10, the mounting bracket 20, and the mounting hole 35 and riveted to the electrical connector 34.

[0037] Therefore, by forming mounting holes 35 on the electrical connector 34, it is convenient for one end of the pole 31 to pass through the mounting holes 35 and be riveted to the electrical connector 34. Reverse riveting is adopted so that the other end of the pole 31 away from the electrical connector 34 can form a complete flat welding surface. At the same time, the reverse riveting design of the pole 31 makes it convenient for the central axis of the mounting hole 35 and the center line of the electrical connector 34 along the thickness direction of the cover plate 10 to be misaligned in the plane of the cover plate 10. This makes the center line of the pole 31 passing through the mounting hole 35 misaligned with the center line of the electrical connector 34, thereby realizing the eccentric design of the pole 31 and the electrical connector 34. This allows for a flexible and centered layout of the tabs, increases the allowable amount of misalignment of the winding tabs, and improves the process tolerance and yield.

[0038] Optionally, the misalignment between the central axis of the mounting hole 35 and the center line of the electrical connector 34 along the thickness direction of the cover plate 10 in the plane of the cover plate 10 is approximately 8mm-13mm.

[0039] Optionally, when the cell spacing has a deviation of less than or equal to 0.5 mm, the flat welding surface at the top of the pole 31 can be used to flexibly adjust the bus welding position to avoid welding stress concentration.

[0040] According to some embodiments of the present invention, such as Figure 4 As shown, the pole post 31 includes a first pole post segment 32 and a second pole post segment 33. The first pole post segment 32 is located on the side of the cover plate 10 away from the mounting bracket 20. The second pole post segment 33 is connected to the first pole post segment 32. The second pole post segment 33 passes through the cover plate 10 and the mounting bracket 20 and is connected to the electrical connector 34. The cross-sectional area of ​​the first pole post segment 32 is larger than the cross-sectional area of ​​the second pole post segment 33.

[0041] The pole post 31 includes a first pole post segment 32 and a second pole post segment 33 arranged along the thickness direction of the cover plate 10. The first pole post segment 32 is located on the side of the cover plate 10 away from the mounting bracket 20 along the thickness direction of the cover plate 10. The first pole post segment 32 is suitable for welding to the busbar. The second pole post segment 33 passes through the cover plate 10, the mounting bracket 20, and the mounting hole 35 in sequence and is riveted to the electrical connector 34. In the thickness direction of the cover plate 10, the cross-sectional area of ​​the first pole post segment 32 is larger than the cross-sectional area of ​​the second pole post segment 33.

[0042] Therefore, by setting the first pole section 32 and the second pole section 33, and riveting the second pole section 33 to the electrical connector 34, the pole 31 is riveted in reverse, which facilitates the formation of a flat welding surface on the first pole section 32, increases the welding area of ​​the busbar, adapts to the cell spacing deviation, and enables the cell to meet the high-capacity overcurrent requirements.

[0043] Optionally, combined Figure 6 A sealing element 44 and an upper bracket 45 are provided between the first pole post section 32 and the cover plate 10. The sealing element 44 is made of fluororubber.

[0044] According to specific embodiments of the present invention, such as Figures 4-6 As shown, the sidewall of the mounting hole 35 is provided with a protrusion 36, which extends circumferentially along the mounting hole 35. The second pole section 33 includes a first sub-pole section 331, a second sub-pole section 332, and a connecting section 333. The first sub-pole section 331 is connected to the first pole section 32. The second sub-pole section 332 is located on the side of the first sub-pole section 331 away from the first pole section 32 and is connected to the electrical connector 34. The connecting section 333 connects the first sub-pole section 331 and the second sub-pole section 332. The cross-sectional area of ​​the connecting section 333 is smaller than the cross-sectional area of ​​the first sub-pole section 331 and smaller than the cross-sectional area of ​​the second sub-pole section 332, so that it, together with the first sub-pole section 331 and the second sub-pole section 332, defines a mating groove 37. The protrusion 36 fits into the mating groove 37.

[0045] The inner wall of the mounting hole 35 of the electrical connector 34 is provided with a protrusion 36. The protrusion 36 protrudes radially from the inner wall of the mounting hole 35 toward the center of the mounting hole 35 and extends circumferentially along the mounting hole 35. The protrusion 36 is adapted to cooperate with the second pole section 33 of the pole post 31. The second pole section 33 includes a first sub-pole section 331, a connecting section 333 and a second sub-pole section 332 arranged sequentially along the thickness direction of the cover plate 10. The first sub-pole section 331 is connected to the side of the first pole section 32 adjacent to the cover plate 10. The second sub-pole section 332 is located on the side of the first sub-pole section 331 away from the first pole section 32 along the thickness direction of the cover plate 10. The two ends of the connecting section 333 are connected to the first sub-pole section 331 and the second sub-pole section 332 respectively. The second sub-pole section 332 passes through the mounting hole 35 and is riveted to the electrical connector 34. In the thickness direction of the cover plate 10, the cross-sectional area of ​​the connecting section 333 is smaller than the cross-sectional area of ​​the first sub-pole section 331 and the second sub-pole section 332. The first sub-pole section 331, the connecting section 333 and the second sub-pole section 332 together define a mating groove 37. The mating groove 37 extends circumferentially along the connecting section 333 and is adapted to form a mating with the protrusion 36 in the mounting hole 35.

[0046] Therefore, by providing a protrusion 36 on the side wall of the mounting hole 35, and by having the first sub-pole segment 331, the connecting segment 333, and the second sub-pole segment 332 of the second pole segment 33 jointly define a mating groove 37, when the second pole segment 33 passes through the mounting hole 35, the protrusion 36 and the mating groove 37 form a fit, thereby achieving the limiting and fixing of the second pole segment 33, facilitating the riveting of the second pole segment 33 with the electrical connector 34, and improving the stability and reliability of the connection between the second pole segment 33 and the electrical connector 34.

[0047] According to some embodiments of the present invention, such as Figure 6 As shown, the cross-sectional area of ​​the second pole section 33 adjacent to the first pole section 32 is greater than the cross-sectional area of ​​the other end of the second pole section 33 away from the first pole section 32, and at least a portion of the second pole section 33 adjacent to the first pole section 32 is disposed between the cover plate 10 and the first pole section 32.

[0048] In the thickness direction of the cover plate 10, the cross-sectional area of ​​the first sub-terminal segment 331 adjacent to the first terminal segment 32 is larger than the cross-sectional area of ​​the second sub-terminal segment 332, and the end of the first sub-terminal segment 331 adjacent to the first terminal segment 32 is located between the first terminal segment 32 and the cover plate 10. Optionally, when the terminal 31 is a negative terminal 41, the first terminal segment 32 is an aluminum part, and the first sub-terminal segment 331 can isolate the electrolyte inside the cell from the first terminal segment 32.

[0049] Therefore, by designing that at least a portion of the second electrode segment 33 is located between the cover plate 10 and the first electrode segment 32, the lithium ions in the electrolyte can be prevented from contacting the first electrode segment 32 and undergoing a chemical reaction, thereby preventing the first electrode segment 32 from being corroded, effectively extending the service life of the electrode segment 31, and improving the stability and reliability of the cover plate assembly 100.

[0050] According to some embodiments of the present invention, such as Figure 6 As shown, the surface of the second sub-terminal segment 332 away from the cover plate 10 is flush with the surface of the electrical connector 34 away from the cover plate 10. This improves the flatness of the surface of the electrical connector 34 away from the cover plate 10, achieving a seal and reducing the probability of electrolyte entering the gap between the second sub-terminal segment 332 and the electrical connector 34.

[0051] According to some embodiments of the present invention, such as Figure 6 As shown, a groove 38 is formed on the second sub-pole segment 332. The groove 38 is recessed from the side surface of the second sub-pole segment 332 away from the cover plate 10 to the connection between the second sub-pole segment 332 and the connecting segment 333.

[0052] In the thickness direction of the cover plate 10, the surface of the second sub-pole segment 332 away from the first pole segment 32 is recessed towards the first pole segment 32 to form a groove 38. The inner surface of the groove 38 adjacent to the first pole segment 32 is flush with the surface of the second sub-pole segment 332 adjacent to the first pole segment 32. The connecting segment 333 is connected to the surface of the second sub-pole segment 332 adjacent to the first pole segment 32. Optionally, after the second pole segment 33 is riveted to the electrical connector 34 through the mounting hole 35, the groove 38 is adapted to accommodate the rivet head.

[0053] Thus, by setting the groove 38, when the second pole post 33 passes through the electrical connector 34 and is riveted to the electrical connector 34, the groove 38 can facilitate the deformation of the end of the second pole post 33 away from the first pole post 32, thereby forming the second sub-pole post 332.

[0054] According to some embodiments of the present invention, such as Figure 6 As shown, the inner surface of the groove 38 extends obliquely from the side away from the cover plate 10 toward the side adjacent to the cover plate 10, toward the central axis of the mounting hole 35. That is, the inner surface of the groove 38 extends obliquely along the radial direction of the mounting hole 35 toward the central axis of the mounting hole 35, and along the thickness direction of the cover plate 10 from the second sub-pole segment 332 to the connecting segment 333. This reduces the risk of stress concentration during riveting and improves the reliability of the cover plate assembly 100.

[0055] According to some embodiments of the present invention, when the terminal post 31 is a positive terminal post 40, the first terminal post segment 32 and the second terminal post segment 33 are made of the same material, and the terminal post 31 is a one-piece molded part. When the terminal post 31 is a negative terminal post 41, the first terminal post segment 32 and the second terminal post segment 33 are made of different materials.

[0056] Optionally, the cover plate assembly 100 includes two terminals 31 and two electrical connectors 34. The two terminals 31 are riveted to the corresponding electrical connectors 34. The two terminals 31 are a positive terminal 40 and a negative terminal 41, respectively. The positive terminal 40 collects the current on the positive tab inside the battery cell through the corresponding electrical connector 34, and the negative terminal 41 collects the current on the negative tab inside the battery cell through the corresponding electrical connector 34.

[0057] When the terminal post 31 is the positive terminal post 40, the first terminal post segment 32 and the second terminal post segment 33 are manufactured using an integrated cold forging process. The forming temperature is approximately 220℃, and the forming pressure is approximately 110MPa, ensuring that the positive terminal post 40 is crack-free and has a smooth surface. The top of the positive terminal post 40 also features a flat welding surface. The first terminal post segment 32 and the second terminal post segment 33 are made of the same material, both being aluminum parts. This reduces contact resistance, improves the conductivity consistency of the positive terminal post 40, enhances assembly accuracy, and simultaneously reduces costs, enabling a lightweight design for the positive terminal post 40.

[0058] When the terminal 31 is the negative terminal 41, the materials of the first terminal segment 32 and the second terminal segment 33 are different. Specifically, the first terminal segment 32 is made of aluminum and the second terminal segment 33 is made of copper.

[0059] In this application, when the electrode 31 is the negative electrode 41, the negative electrode 41 is made by friction welding or copper-aluminum composite plate. For example, the first electrode segment 32 and the second electrode segment 33 are made by friction welding composite, and the negative electrode 41 is a copper-aluminum friction welding composite structure. Only the second electrode segment 33 is made of copper. For example, the first electrode segment 32 is made of 6061 aluminum alloy, and the second electrode segment 33 is made of T2 copper core. While ensuring the conductivity of the negative electrode 41, copper can be effectively reduced and costs can be lowered.

[0060] Optionally, when the terminal 31 is a positive terminal 40, the electrical connector 34 corresponding to the positive terminal 40 is made of aluminum, and when the terminal 31 is a negative terminal 41, the electrical connector 34 corresponding to the negative terminal 41 is made of copper. The material of the electrical connector 34 has the characteristics of being resistant to electrolyte corrosion, having excellent thermal and electrical conductivity, and being easy to form by ultrasonic welding and laser welding. The thickness of the electrical connector 34 is about 1mm-3mm. The electrical connector 34 is integrally stamped and formed without secondary bending and shaping, and has high structural strength and is not easily deformed.

[0061] Optionally, when the electrode 31 is a negative electrode 41, the tensile strength of the negative electrode 41 is greater than or equal to 150 MPa, thereby effectively improving the structural strength of the negative electrode 41.

[0062] Optionally, when the electrode 31 is a positive electrode 40, the upper support 45 between the first electrode segment 32 of the positive electrode 40 and the cover plate 10 is made of conductive plastic; when the electrode 31 is a negative electrode 41, the upper support 45 between the first electrode segment 32 of the negative electrode 41 and the cover plate 10 is made of insulating plastic.

[0063] According to some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the electrode assembly 30 includes a positive electrode assembly 42 and a negative electrode assembly 43. The positive electrode assembly 42 and the negative electrode assembly 43 are spaced apart along the length direction of the cover plate 10. One end of the electrode 31 of the positive electrode assembly 42 and the negative electrode assembly 43 passes through the cover plate 10 and the mounting bracket 20 from the side of the cover plate 10 away from the mounting bracket 20 and is connected to the electrical connector 34. The other end of the electrode 31 is formed as a flat welding surface. The electrical connector 34 of the positive electrode assembly 42 and the negative electrode assembly 43 is located on the side of the center line of the corresponding electrode 31 adjacent to the center of the cover plate 10 in the length direction along the thickness direction of the cover plate 10.

[0064] The positive terminal assembly 42 includes a positive terminal 40 and an electrical connector 34, and the negative terminal assembly 43 includes a negative terminal 41 and an electrical connector 34. At one end of the positive terminal 40 and the negative terminal 41 adjacent to the electrode group, a cover plate 10, a mounting bracket 20, and a mounting hole 35 are sequentially inserted and riveted to the corresponding electrical connector 34. At the other end of the positive terminal 40 and the negative terminal 41 away from the electrode group, i.e., at the top of the positive terminal 40 and the negative terminal 41, a complete and flat welding surface is formed. Figure 2 The center line of the electrical connector 34 of the positive terminal assembly 42 is located on the side of the center line of the positive terminal 40 adjacent to the center of the cover plate 10 in the length direction, and the center line of the electrical connector 34 of the negative terminal assembly 43 is located on the side of the center line of the negative terminal 41 adjacent to the center of the cover plate 10 in the length direction.

[0065] Therefore, by setting the positive terminal assembly 42 and the negative terminal assembly 43, it is convenient to realize the introduction and output of current. Since the other end of the terminal 31 in the positive terminal assembly 42 and the negative terminal assembly 43 are both formed as flat welding surfaces, the welding area of ​​the busbar can be effectively increased to meet the overcurrent requirements of large-capacity cells. By taking the center line of the electrical connector 34 of the positive terminal assembly 42 and the negative terminal assembly 43 as the side adjacent to the center of the cover plate 10 along the length direction of the corresponding terminal 31, the eccentric design of the electrical connector 34 and the corresponding terminal 31 can be realized. This allows for flexible centering of the tabs, increases the allowable misalignment of the winding tabs, improves process fault tolerance and yield, and enhances the compatibility and adaptability of the cover plate assembly 100.

[0066] Optionally, the center line of the electrical connector 34 of the positive terminal assembly 42 is located on the side of the center line of the positive terminal 40 away from the center of the cover plate 10 in the length direction, and the center line of the electrical connector 34 of the negative terminal assembly 43 is located on the side of the center line of the negative terminal 41 away from the center of the cover plate 10 in the length direction.

[0067] According to some embodiments of the present invention, such as Figure 7 and Figure 8 As shown, at least one pressing groove 11 is formed on the side of the cover plate 10 adjacent to the mounting bracket 20, and at least one pressing part 21 is provided on the side of the mounting bracket 20 adjacent to the cover plate 10, and the pressing part 21 cooperates with the pressing groove 11.

[0068] For example, a pressing groove 11 is formed on the side of the cover plate 10 adjacent to the mounting bracket 20, and a pressing part 21 is provided on the side of the mounting bracket 20 adjacent to the cover plate 10. The pressing part 21 and the pressing groove 11 are arranged opposite to each other along the thickness direction of the cover plate 10, thereby realizing the positioning and assembly of the cover plate 10 and the mounting bracket 20.

[0069] Therefore, by setting the pressing part 21 and the pressing groove 11, the pressing part 21 and the pressing groove 11 can be fitted together, which can realize the convenient assembly and stable engagement of the cover plate 10 and the mounting bracket 20. At the same time, it can improve the positioning accuracy of the cover plate 10 and the mounting bracket 20, reduce the assembly difficulty of the cover plate 10 and the mounting bracket 20 and improve the assembly efficiency, avoid the loosening or offset between the cover plate 10 and the mounting bracket 20, and effectively improve the overall structural stability and reliability of the cover plate assembly 100.

[0070] Optionally, the mounting bracket 20 has 4-8 pressing portions 21 on one side adjacent to the cover plate 10. The pressing portions 21 are distributed circumferentially along the mounting bracket 20 to ensure that the cover plate 10 and the mounting bracket 20 are subjected to balanced force and fit tightly. The height of the pressing portion 21 along the thickness direction of the cover plate 10 is about 1.5mm-3mm, the elastic deformation stroke of the pressing portion 21 is greater than or equal to 0.5mm, the depth of the pressing groove 11 along the thickness direction of the cover plate 10 is about 1.5mm-3mm, and the width of the pressing groove 11 along the length direction of the cover plate 10 is about 0.1mm-0.2mm wider than the width of the pressing portion 21.

[0071] According to some embodiments of the present invention, such as Figure 8 As shown, the pressing groove 11 is formed openly on one side of the cover plate 10 toward the mounting bracket 20 along the thickness direction, and the cross-sectional area of ​​the pressing groove 11 gradually decreases along the thickness direction of the cover plate 10 and toward the mounting bracket 20.

[0072] In this application, the pressing part 21 is an elastic plastic part. The pressing groove 11 on the cover plate 10 is open to the mounting bracket 20 along the thickness direction of the cover plate 10. In the direction of the thickness direction of the cover plate 10 toward the mounting bracket 20, the cross-sectional area of ​​the pressing groove 11 gradually decreases. The pressing part 21 on the mounting bracket 20 can be pressed from the open side of the pressing groove 11 into the pressing groove 11, thereby forming a fit with the pressing groove 11.

[0073] Therefore, by opening the pressing groove 11 along the thickness direction of the cover plate 10 towards the mounting bracket 20, the pressing part 21 can easily enter the pressing groove 11 from the open side. The design of the pressing groove 11 with the cross-sectional area gradually decreasing along the thickness direction of the cover plate 10 towards the mounting bracket 20 facilitates the deformation of the pressing part 21 after entering the pressing groove 11, so that the pressing part 21 and the pressing groove 11 form an interference fit, thereby achieving a firm connection between the cover plate 10 and the mounting bracket 20.

[0074] According to some embodiments of the present invention, such as Figure 8 As shown, along the thickness direction of the cover plate 10, the cross-sectional area of ​​the pressing part 21 gradually decreases from the center to both ends, and a portion of at least one side surface of the pressing part 21 is formed as a mating surface 22, which is provided on the side of at least one side surface adjacent to the mounting bracket 20.

[0075] Optionally, the side surface of the pressing part 21 adjacent to the mounting bracket 20 is formed as a mating surface 22. When the pressing part 21 enters the pressing groove 11 from the open side, the mating surface 22 of the pressing part 21 can fit with the corresponding side wall of the pressing groove 11. Thus, by providing the mating surface 22, the mating surface 22 of the pressing part 21 fits with the pressing groove 11, which can effectively prevent the pressing part 21 from falling out of the pressing groove 11, thereby improving the connection strength between the cover plate 10 and the mounting bracket 20, and improving the reliability and stability of the connection between the cover plate 10 and the mounting bracket 20.

[0076] Optionally, combined Figure 8 At least one side surface of the pressing part 21 is formed as a guide surface 23, which is located on the side of the at least one side surface away from the mounting bracket 20.

[0077] The side surface of the pressing part 21 away from the mounting bracket 20 is formed as a guide surface 23. When the pressing part 21 enters the pressing groove 11 from the open side, the guide surface 23 on the pressing part 21 first contacts the side wall of the pressing groove 11 and forms a guiding fit. At this time, the pressing part 21 gradually undergoes elastic deformation. When the guide surface 23 is fully inserted into the pressing groove 11, the pressing part 21 gradually recovers as pressing continues, and the mating surface 22 of the pressing part 21 forms a fit with the pressing groove 11.

[0078] Therefore, by setting the guide surface 23, the assembly of the pressing part 21 and the pressing groove 11 can be guided, reducing the assembly difficulty of the cover plate 10 and the mounting bracket 20 and improving the assembly efficiency.

[0079] According to some embodiments of the present invention, such as Figure 8 As shown, the mating surface 22 and the guide surface 23 are connected to each other, and the ends of the mating surface 22 and the guide surface 23 that are away from each other gradually extend towards the center of the pressing part 21 along the thickness direction of the cover plate 10.

[0080] The mating surface 22 and the guide surface 23 are connected at their adjacent ends, and the other ends of the mating surface 22 and the guide surface 23 extend obliquely along the thickness direction of the cover plate 10 toward the direction away from each other and toward the center of the pressing part 21.

[0081] Therefore, by extending the mating surface 22 and the guide surface 23 at an angle, it is easier for the mating surface 22 to fit into the pressing groove 11, and the assembly difficulty of the pressing part 21 and the pressing groove 11 is reduced, the risk of stress concentration during assembly is reduced, and the reliability of assembly is improved.

[0082] According to some embodiments of the present invention, such as Figure 8 As shown, there are multiple pressing parts 21, and adjacent pressing parts 21 are arranged symmetrically.

[0083] Multiple pressing portions 21 can be spaced apart along the length of the cover plate 10 or along the width of the cover plate 10, and adjacent pressing portions 21 are symmetrically arranged. Optionally, each pressing groove 11 has two pressing portions 21 fitted in it, and the two pressing portions 21 are symmetrically arranged. Thus, by providing multiple pressing portions 21, the connection strength between the cover plate 10 and the mounting bracket 20 can be improved, thereby improving the overall structural stability of the cover plate assembly 100. At the same time, the symmetrical arrangement of adjacent pressing portions 21 can ensure uniform stress during assembly and reduce the risk of stress concentration.

[0084] Optionally, the cover plate 10 is made of 6061 aluminum alloy and manufactured by stamping. The cover plate 10 is approximately 3mm thick, and its surface is anodized (oxide layer thickness approximately 0.05mm) to improve corrosion resistance. Figure 3 The cover plate 10 has a mating hole 12 at the installation position of the pole post 31. The diameter of the mating hole 12 is adapted to the size of the pole post 31, and the pole post 31 can pass through the mating hole 12. The cover plate 10 has an assembly groove corresponding to the mounting position of the mounting bracket 20. The inner wall of the assembly groove is polished smooth. The mounting bracket 20 is manufactured by injection molding. The overall size of the mounting bracket 20 is adapted to the cover plate 10. The top of the mounting bracket 20 has an assembly boss corresponding to the mounting position of the cover plate 10. The height of the assembly boss along the thickness direction of the cover plate 10 is about 1mm-2mm and the width is about 1.5mm-6mm. After the pressing groove 11 on the cover plate 10 is engaged with the pressing part 21 on the mounting bracket 20, the mounting boss on the mounting bracket 20 is then inserted into the corresponding assembly groove on the cover plate 10 by pressing clamps or pressing equipment. This achieves double fixation of the cover plate 10 and the mounting bracket 20, ensuring that the cover plate assembly 100 can be used for long-term service without loosening or shifting, and is suitable for harsh vibration conditions such as vehicle and energy storage applications.

[0085] According to some embodiments of the present invention, such as Figure 3 and Figure 5 As shown, the cover plate assembly 100 also includes a high-temperature protection element 50, which is disposed on the side of the mounting bracket 20 facing the cover plate 10. The high-temperature protection element 50 is configured to withstand a maximum temperature greater than that of the mounting bracket 20.

[0086] The high-temperature protection component 50 is embedded in the mounting bracket 20 on the side adjacent to the cover plate 10 along the thickness direction of the cover plate 10, and the melting point of the high-temperature protection component 50 is higher than the melting point of the mounting bracket 20. When the cell experiences thermal runaway and the temperature is ≥600℃, the mounting bracket 20 melts at high temperature, and the high-temperature protection component 50 is located between the electrode group and the cover plate 10.

[0087] Therefore, by setting the high-temperature protection component 50, when the cell experiences thermal runaway, the electrode group can be prevented from contacting the cover plate 10, blocking the transmission of high temperature, thereby preventing the thermal runaway process of the cell from intensifying, achieving the function of high-temperature protection, preventing short circuits, fires, and explosions, and avoiding safety accidents.

[0088] According to some embodiments of the present invention, such as Figure 3 and Figure 5 As shown, the mounting bracket 20 has an assembly protrusion 24 on the side away from the cover plate 10, and an assembly groove 25 is formed on the assembly protrusion 24. The high-temperature protective component 50 is fitted into the assembly groove 25.

[0089] In the thickness direction of the cover plate 10, the mounting bracket 20 is provided with a mounting protrusion 24 on the side away from the cover plate 10. The mounting protrusion 24 protrudes from the side of the mounting bracket 20 adjacent to the cover plate 10 toward the direction away from the cover plate 10. A mounting groove 25 for mounting the high temperature protection component 50 is formed on the mounting protrusion 24. The mounting groove 25 is open toward the cover plate 10 along the thickness direction of the cover plate 10. The mounting groove 25 is adapted to the size of the high temperature protection component 50 and is used to embed the high temperature protection component 50.

[0090] Therefore, by setting the assembly protrusion 24, it is easy to form the assembly groove 25 on the mounting bracket 20, which facilitates the installation of the high temperature protection component 50 in the assembly groove 25, thereby realizing the embedded assembly of the high temperature protection component 50 on the mounting bracket 20. At the same time, the assembly groove 25 can limit and fix the high temperature protection component 50, improving the stability and reliability of the installation of the high temperature protection component 50.

[0091] Optionally, the inner wall of the assembly slot 25 is provided with positioning protrusions to ensure that the high-temperature protective component 50 is accurately assembled in the assembly slot 25.

[0092] According to some embodiments of the present invention, such as Figure 3 and Figure 5 As shown, the high-temperature protection component 50 includes: a plurality of first high-temperature protection components 51 and second high-temperature protection components 52. The plurality of first high-temperature protection components 51 are respectively disposed at both ends of the mounting bracket 20 along the length direction of the cover plate 10, and the second high-temperature protection components 52 are disposed in the middle of the mounting bracket 20, and the second high-temperature protection components 52 are located between the plurality of first high-temperature protection components 51.

[0093] In this embodiment, taking the high-temperature protective component 50 as an example, which includes two first high-temperature protective components 51 and one second high-temperature protective component 52, as follows: Figure 5 As shown, two first high-temperature protective components 51 are respectively disposed at both ends of the mounting bracket 20 along the length direction of the cover plate 10, and a second high-temperature protective component 52 is disposed in the central area of ​​the mounting bracket 20, and the second high-temperature protective component 52 is disposed at intervals between the two first high-temperature protective components 51 along the length direction of the cover plate 10.

[0094] Therefore, by setting multiple first high-temperature protection components 51 and second high-temperature protection components 52, the contact between the electrode assembly and the cover plate 10 can be effectively avoided, achieving high-temperature protection while reducing the risk of stress concentration and improving the safety and reliability of the cover plate assembly 100.

[0095] According to some embodiments of the present invention, such as Figure 9 As shown, the first high-temperature protective component 51 has a plurality of first through holes 511 spaced apart along the width direction of the cover plate 10. Each first through hole 511 is an elongated hole extending along the length direction of the cover plate 10, and the width of the first through hole 511 in the width direction of the cover plate 10 is greater than the distance between two adjacent first through holes 511. Optionally, the shape of the first through hole 511 can be rectangular or elliptical. Therefore, by providing multiple first through holes 511, heat dissipation is facilitated, and the weight of the first high-temperature protective component 51 is reduced, thereby achieving a lightweight design of the cover plate assembly 100.

[0096] Optionally, combined Figure 3 The cover plate assembly 100 also includes an explosion-proof valve 13 and an explosion-proof valve protective film 14. The explosion-proof valve 13 is made of aluminum 1100, and the explosion-proof valve protective film 14 is made of PET (Polyethylene Terephthalate). The explosion-proof valve 13 is located in the central area of ​​the cover plate 10 on the side adjacent to the mounting bracket 20, and the explosion-proof valve protective film 14 is located on the side of the explosion-proof valve 13 away from the mounting bracket 20. When the battery cell experiences thermal runaway, the explosion-proof valve 13 opens and discharges high-temperature and high-pressure gas and residue, balancing the internal and external gas pressure, thereby achieving explosion-proof pressure relief.

[0097] Optionally, combined Figure 10 The second high-temperature protective component 52 has a second through hole 521 and multiple third through holes 522. The second through hole 521 is adapted to avoid the explosion-proof valve 13. The multiple third through holes 522 are respectively located on both sides of the second through hole 521 along the width direction of the cover plate 10, and the multiple third through holes 522 are spaced apart along the length direction of the cover plate 10. The second through hole 521 and the explosion-proof valve 13 are opposite each other along the thickness direction of the cover plate 10. Optionally, the shape of the second through hole 521 can be rectangular, and the shape of the third through holes 522 can be circular, square, or rectangular.

[0098] Therefore, by setting the second through hole 521, the explosion-proof valve 13 can be avoided, thus facilitating the normal opening and pressure relief of the explosion-proof valve 13. By setting multiple third through holes 522, the weight of the second high-temperature protective component 52 can be reduced, thereby achieving a lightweight design of the cover plate assembly 100, and at the same time, facilitating heat dissipation.

[0099] According to some embodiments of the present invention, the high-temperature protective component 50 is a ceramic component. This improves the high-temperature protective component 50's resistance to high temperatures and thermal runaway, prevents deformation of the high-temperature protective component 50 under high-temperature conditions, improves the insulation of the high-temperature protective component 50, extends its service life, reduces the risk of short circuits, and enhances the safety and reliability of the cover plate assembly 100.

[0100] Optionally, the positive terminal 40 and the negative terminal 41 are first installed in the corresponding mating holes 12 of the cover plate 10 by reverse riveting, thereby realizing the assembly of the terminal 31 and the cover plate 10. The end of the terminal 31 away from the electrode group is a flat welding surface. The high temperature protection component 50 is embedded in the assembly groove 25 of the mounting bracket 20 to ensure that the high temperature protection component 50 is firmly connected to the mounting bracket 20 without looseness. The flatness of the high temperature protection component 50 is checked to ensure that the high temperature protection component 50 is flush with the side surface of the mounting bracket 20 adjacent to the cover plate 10 without protrusions or depressions. The pressing groove 11 on the cover plate 10 is made to mate with the pressing part 21 on the mounting bracket 20. Then, the mounting boss on the mounting bracket 20 is inserted into the corresponding mounting groove on the cover plate 10 by pressing clamp or pressing equipment, thereby realizing the double fixation of the cover plate 10 and the mounting bracket 20. One end of the pole post 31 adjacent to the pole group has a mating groove 37. The protrusion 36 of the mounting hole 35 on the electrical connector 34 fits into the mating groove 37 to form a mating, ensuring a flat fit without warping or gaps. A riveting jig is used to rivet the pre-reserved riveting structure of the pole post 31 into the pre-reserved position of the connecting piece. Then, a laser is used to weld the two mating surfaces together to make them integrated, which has better overcurrent capability. This enables the assembly of the cover plate assembly 100 and achieves a comprehensive improvement in five dimensions: electrical connection, manufacturing cost, process tolerance, structural stability, and safety protection.

[0101] Optionally, in this application, the overall structure of the cover plate assembly 100 is simplified, the number of parts is reduced, the assembly process is shortened, and it is suitable for automated production lines of 588Ah and above large-capacity battery cells, taking into account high performance, low cost and high mass production. In addition, the size and process parameters of each component in this application can be flexibly adjusted according to the actual battery cell specifications.

[0102] According to a second aspect of the present invention, the battery cell includes the cover plate assembly 100 of any of the above embodiments.

[0103] Optionally, the battery cell includes electrode groups, electrolyte, cover plate assembly 100, and housing, and the battery cell is used to store and release electrical energy. The electrode posts 31 in the cover plate assembly 100 adopt a reverse riveting design, increasing the busbar welding area, achieving cell spacing adaptation, and effectively meeting the overcurrent requirements after the increase in capacity. Simultaneously, the electrode posts 31 and electrical connectors 34 in the cover plate assembly 100 are eccentrically positioned. With a fixed center distance between the positive electrode post 40 and the negative electrode post 41, flexible offset of the electrical connector 34 and precise centering of the electrode tabs can be achieved, increasing the allowance for winding electrode tab misalignment, improving the compatibility and adaptability of the cover plate assembly 100, effectively enhancing the fault tolerance of the winding process, and improving the battery cell production yield. The negative electrode post 41 in the cover plate assembly 100 is a copper-aluminum friction-welded composite structure, retaining only a small copper segment on the inner side, effectively reducing battery cell production costs and reducing the number of processing steps for the electrode post 31. When the cell experiences thermal runaway and the temperature is ≥600℃, the high-temperature protection component 50 in the cover plate assembly 100 can effectively prevent the electrode group from contacting the cover plate 10. When abnormal high temperature gas is generated inside the cell, the upward displacement of the electrode group can be reduced, completely avoiding the risk of short circuit, fire, and explosion, meeting the safety standard requirements for large-capacity cells, and improving the safety and reliability of the cell.

[0104] Optionally, the module includes multiple battery cells. After the multiple cells are electrically connected, they are combined with brackets, wiring harnesses, temperature sampling devices, protective structures, etc., to form the module. Because the flat welding surface on the top of the terminal 31 allows for flexible adjustment of the busbar welding position, module assembly consistency and electrical connection reliability can be effectively ensured. The battery pack includes multiple modules, a BMS (Battery Management System), etc., and possesses complete safety, temperature control, and electronic control capabilities. As a power source, the battery pack can be integrated with the vehicle's electronic control, motor, and electronic control system to drive the vehicle. A large number of battery packs can be clustered together with energy storage converters, fire protection, monitoring, and distribution cabinets to form an energy storage power station for grid peak shaving and backup power.

[0105] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0106] In the description of this invention, "first feature" and "second feature" may include one or more of the features. In the description of this invention, "a plurality of" means two or more. In the description of this invention, "above" or "below" the second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them. In the description of this invention, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0107] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0108] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, include: Cover plate; Mounting bracket, which is connected to one side of the cover plate; A pole assembly includes a pole and an electrical connector. The electrical connector is located on the side of the mounting bracket away from the cover plate. One end of the pole passes through the cover plate and the mounting bracket from the side of the cover plate away from the mounting bracket and connects to the electrical connector. The other end of the pole is formed as a flat welding surface. The center line of the electrical connector along the thickness direction of the cover plate and the center line of the pole along the thickness direction of the cover plate are offset in the plane where the cover plate is located.

2. The cover plate assembly according to claim 1, characterized in that, The electrical connector has a mounting hole that extends through the thickness of the cover plate. The central axis of the mounting hole is offset from the center line of the electrical connector along the thickness of the cover plate in the plane of the cover plate. One end of the pole is riveted to the electrical connector through the mounting hole.

3. The cover plate assembly according to claim 2, characterized in that, The pole includes: The first pole section is located on the side of the cover plate away from the mounting bracket; The second pole section is connected to the first pole section. The second pole section passes through the cover plate and the mounting bracket and is connected to the electrical connector. The cross-sectional area of ​​the first pole section is larger than that of the second pole section.

4. The cover plate assembly according to claim 3, characterized in that, The sidewall of the mounting hole is provided with a protrusion, which extends circumferentially along the mounting hole; The second pole column segment includes: The first sub-pole segment is connected to the first pole segment; The second sub-terminal segment is located on the side of the first sub-terminal segment away from the first sub-terminal segment, and the second sub-terminal segment is connected to the electrical connector. A connecting segment is connected between the first sub-pole segment and the second sub-pole segment. The cross-sectional area of ​​the connecting segment is smaller than the cross-sectional area of ​​both the first and second sub-pole segments, so as to define a mating groove together with the first and second sub-pole segments. The protrusion fits into the mating groove.

5. The cover plate assembly according to claim 3, characterized in that, The cross-sectional area of ​​the second pole segment adjacent to one end of the first pole segment is greater than the cross-sectional area of ​​the other end of the second pole segment away from the first pole segment, and at least a portion of the second pole segment adjacent to the first pole segment is disposed between the cover plate and the first pole segment.

6. The cover plate assembly according to claim 4, characterized in that, A groove is formed on the second sub-pole segment, the groove being recessed from the side surface of the second sub-pole segment away from the cover plate to the connection point between the second sub-pole segment and the connecting segment.

7. The cover plate assembly according to claim 3, characterized in that, When the electrode is a positive electrode, the first electrode segment and the second electrode segment are made of the same material, and the electrode is a one-piece molded part; When the electrode is a negative electrode, the first electrode segment and the second electrode segment are made of different materials.

8. The cover plate assembly according to claim 7, characterized in that, When the electrode is a negative electrode, the first electrode segment is made of aluminum and the second electrode segment is made of copper.

9. The cover plate assembly according to claim 1, characterized in that, The electrode assembly includes a positive electrode assembly and a negative electrode assembly, which are spaced apart along the length of the cover plate. One end of each electrode of the positive and negative electrode assemblies passes through the cover plate and the mounting bracket from the side away from the mounting bracket and connects to the electrical connector. The other end of each electrode is formed as a flat welding surface. The electrical connectors of the positive and negative electrode assemblies are located along the centerline of the thickness direction of the cover plate, respectively, on the side adjacent to the centerline of the corresponding electrode in the length direction of the cover plate.

10. The cover plate assembly according to claim 1, characterized in that, The cover plate has at least one pressing groove on the side adjacent to the mounting bracket, and the mounting bracket has at least one pressing part on the side adjacent to the cover plate, the pressing part cooperating with the pressing groove.

11. The cover plate assembly according to claim 10, characterized in that, The pressing groove is formed openly towards the mounting bracket along the thickness direction of the cover plate, and the cross-sectional area of ​​the pressing groove gradually decreases along the thickness direction of the cover plate and towards the mounting bracket.

12. The cover plate assembly according to claim 10, characterized in that, Along the thickness direction of the cover plate, the cross-sectional area of ​​the pressing part gradually decreases from the center to both ends; At least one side surface of the pressing portion is formed as a mating surface, the mating surface being located on the side of the at least one side surface adjacent to the mounting bracket; and / or, At least one side surface of the pressing part is formed as a guide surface, and the guide surface is located on the side of the at least one side surface away from the mounting bracket.

13. The cover plate assembly according to claim 12, characterized in that, The mating surface and the guide surface are connected to each other, and the ends of the mating surface and the guide surface away from each other gradually extend at an inclination toward the center of the pressing part along the thickness direction of the cover plate.

14. The cover plate assembly according to claim 10, characterized in that, There are multiple pressing parts, which are symmetrically arranged adjacent to each other.

15. The cover plate assembly according to any one of claims 1-14, characterized in that, Also includes: A high-temperature protective component is provided on the side of the mounting bracket facing the cover plate, and the high-temperature protective component is configured to withstand a maximum temperature greater than that of the mounting bracket.

16. The cover plate assembly according to claim 15, characterized in that, The mounting bracket has an assembly protrusion on the side away from the cover plate, and an assembly groove is formed on the assembly protrusion, and the high-temperature protective component is fitted into the assembly groove.

17. The cover plate assembly according to claim 15, characterized in that, The high-temperature protective component includes: Multiple first high-temperature protective components are respectively disposed at both ends of the mounting bracket along the length direction of the cover plate; The second high-temperature protective component is located in the middle of the mounting bracket and is situated between a plurality of the first high-temperature protective components.

18. The cover plate assembly according to claim 17, characterized in that, The first high-temperature protective component has a plurality of first through holes spaced apart along the width direction of the cover plate. Each first through hole is an elongated hole extending along the length direction of the cover plate. The width of each first through hole in the width direction of the cover plate is greater than the distance between two adjacent first through holes; and / or, The second high-temperature protective component has a second through hole and a plurality of third through holes. The second through hole is adapted to avoid the explosion-proof valve. The plurality of third through holes are respectively located on both sides of the second through hole along the width direction of the cover plate, and the plurality of third through holes are arranged at intervals along the length direction of the cover plate.

19. The cover plate assembly according to claim 15, characterized in that, The high-temperature protective component is a ceramic component.

20. A battery cell, characterized in that, Includes the cover plate assembly according to any one of claims 1-19.

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