Cover plate assembly and cylindrical battery

Abstract

The application relates to the technical field of batteries, in particular to a cover plate assembly and a cylindrical battery. The cover plate assembly comprises a cover plate, a bus plate and pole columns, the cover plate and the bus plate are coaxially opposite, the plurality of pole columns are arranged at intervals along the circumference of the cover plate and are arranged through the cover plate, and one end of each pole column is welded to the bus plate. A plurality of flow-equalizing ribs are formed in a radial circumferential distribution on the side of the bus plate away from the cover plate, the plurality of flow-equalizing ribs are arranged in one-to-one correspondence with the plurality of pole columns, and the plurality of flow-equalizing ribs respectively pass through the welding positions of the corresponding pole columns, so that a plurality of low-impedance paths with equal resistance values are defined on the bus plate in one-to-one correspondence with the plurality of pole columns through the plurality of flow-equalizing ribs, uniform distribution of current is realized, the currents flowing through the pole columns tend to be the same, and local overheating is avoided; meanwhile, the flow-equalizing ribs also increase the conductor cross-sectional area of the paths of the pole columns, so that the internal resistance of the battery is effectively reduced; and further, the cover plate assembly meets the use requirements of an ultralarge capacity battery.

Description

Technical Field

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

[0002] Existing cylindrical battery cover structures typically employ a single-terminal design with a busbar for current collection and conduction. This traditional structure performs well in small- to medium-capacity batteries, meeting standard usage requirements. However, when battery capacity increases to ultra-large capacities exceeding 3000 Ah, the operating current significantly increases. Conventional cover structures suffer from severe current distribution problems, resulting in excessively high current density in certain areas. Furthermore, the Joule heating effect generated by high current further increases the contact resistance between the terminal and the busbar, creating a vicious cycle. This uneven current distribution and excessive internal resistance not only cause localized overheating of the terminal but can also damage the busbar due to prolonged exposure to uneven stress, severely impacting battery safety and cycle life. Summary of the Invention

[0003] The purpose of this invention is to provide a cover plate assembly and a cylindrical battery to improve the uniformity of current distribution and reduce internal resistance to a certain extent, so that the cover plate assembly can meet the needs of ultra-large capacity batteries of 3000Ah and above.

[0004] This invention provides a cover plate assembly for a cylindrical battery; the cover plate assembly includes a cover plate, a busbar, and terminal posts; The cover plate and the busbar are coaxially spaced apart. The poles are inserted through the cover plate. There are multiple poles, which are spaced apart along the circumference of the cover plate. One end of each pole is welded to the busbar. The side of the manifold away from the cover plate has flow equalization ribs. There are multiple flow equalization ribs, which are radially distributed around the center of the manifold. The multiple flow equalization ribs are arranged in a one-to-one correspondence with multiple pole posts.

[0005] Furthermore, the cover plate assembly also includes a load-bearing connecting plate; The load connection plate is annular and located on the side of the cover plate away from the busbar. It is coaxially spaced from the cover plate. The end of each pole facing the load connection plate is welded to the load connection plate or fastened to it by fasteners.

[0006] Furthermore, the cover plate has a plurality of first mounting holes, and the plurality of pole posts are inserted into the plurality of first mounting holes in a corresponding manner, and each pole post is fitted with an insulating isolation sleeve on its outer side; The outer wall of the insulating sleeve is formed with a first stepped portion, and the inner wall of the first mounting hole is formed with a second stepped portion that abuts against the first stepped portion. The inner wall of the insulating sleeve forms a third step, and the outer wall of the pole forms a fourth step that abuts against the third step. A first seal is provided between the third step and the fourth step.

[0007] Furthermore, it also includes a one-way pressure relief valve, the one-way pressure relief valve including a valve body, one end of which has a protruding first connecting portion; The cover plate has a second mounting hole, the valve body and the cover plate are sealed and welded together by a second sealing element, and the first connecting part is inserted into the second mounting hole; The outer wall of the first connecting part is fitted with a third sealing element to seal against the wall of the second mounting hole; or, the second mounting hole is provided with an internal thread connecting part, and the first connecting part is provided with a matching external thread connecting part, so that the connecting part is screwed into the second mounting hole.

[0008] Furthermore, the cover plate has an injection hole, and the cover plate assembly also includes a sealing plug for sealing the injection hole; The sealing plug includes a cap and a second connecting portion formed on the cap. The connecting portion is adapted to be screwed into the injection hole. The cap is sealed against the cover plate by a fourth sealing element. or, The sealing plug includes a screw and a nut, with an annular abutment portion formed in the middle of the screw; The wall of the injection hole is formed with a fifth step, one end of the screw is screwed into the injection hole, and the abutting part is sealed and abutted against the fifth step by a fifth sealing element; The nut is screwed to the other end of the screw rod, and the nut is sealed against the cover plate by a sixth sealing element.

[0009] Furthermore, an explosion-proof valve is installed in the middle of the cover plate.

[0010] Furthermore, the cover plate assembly is used in sodium-ion batteries; The cover plate has a reference diameter of 350 mm to 500 mm; the cover plate has a thickness of 5 mm to 15 mm. The number of poles is 6 to 12; the diameter of the poles is 20 mm to 50 mm; The welding current between the electrode and the busbar is controlled at 200A to 250A, the welding strength is ≥150MPa, and the welding joint between the electrode and the busbar is coated with a sealant layer. The thickness of the busbar is 6mm to 10mm; The cross-sectional area of ​​the flow equalization rib is ≥600mm². 2 .

[0011] Furthermore, both the busbar and the load connection plate are provided with multiple weight-reducing and air-avoiding holes at intervals.

[0012] Furthermore, both the manifold and the cover plate are integrally cast.

[0013] The present invention also provides a cylindrical battery comprising the cover assembly described in any of the preceding claims.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The cover plate assembly provided by this invention includes a cover plate, a busbar, and terminals. Both the cover plate and the busbar are circular and are coaxially spaced apart. Multiple terminals are inserted through the cover plate and spaced apart circumferentially along the cover plate. One end of each terminal is welded to the busbar to achieve electrical connection between the terminals and the busbar. When used in cylindrical batteries, the cover plate is connected to the open end of the battery casing to form a sealed cavity for housing the battery cells. The busbar is located on the side of the cover plate facing the inside of the battery and is welded to the tabs of the battery cells to achieve electrical connection between the terminals and the battery cells.

[0015] Multiple current-equalizing ribs are formed on the side of the busbar away from the cover plate. These ribs are radially distributed circumferentially around the center of the busbar, meaning they are spaced apart circumferentially. The length of each rib extends radially along the busbar. Each current-equalizing rib corresponds to one of the multiple terminals, passing through the welding position of its respective terminal. This creates multiple low-impedance paths with equal resistance on the busbar, corresponding to the terminals, thus achieving uniform current distribution. This ensures that the current flowing through each terminal is similar and prevents localized overheating. Simultaneously, the ribs increase the conductor cross-sectional area of ​​the corresponding paths, effectively reducing the resistance at the busbar connection and lowering the battery's internal resistance. This allows the cover plate assembly of this application to meet the needs of ultra-high capacity (e.g., 3000Ah and above) batteries.

[0016] The present invention also provides a cylindrical battery including the aforementioned cover assembly, thus the cylindrical battery also has the beneficial effects of the cover assembly. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the split structure of the cover plate assembly provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the busbar provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of the pole post on the cover plate according to an embodiment of the present invention; Figure 4 This is an assembly diagram of a one-way pressure relief valve provided in an embodiment of the present invention; Figure 5 This is another assembly diagram of the one-way pressure relief valve provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of an assembly of a sealing plug provided in an embodiment of the present invention; Figure 7 This is another assembly diagram of the sealing plug provided in an embodiment of the present invention.

[0019] Figure label: 1-Cover plate; 11-First mounting hole; 12-Second mounting hole; 2-Pole post; 21-Insulating sleeve; 22-First seal; 3-Manifold; 31-Flow equalization rib; 32-Weight reduction and clearance hole; 4-Load connection plate; 5-One-way pressure relief valve; 51-First connection part; 52-Second seal; 53-Third seal; 6-Sealing plug; 61-Plug cap; 62-Second connection part; 63-Screw; 64-Nut; 65-Fifth seal; 66-Sixth seal. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0022] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 the invention and for 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 limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The following reference Figures 1 to 7 This application describes a cover plate assembly and a cylindrical battery according to some embodiments thereof.

[0026] This application provides a cover plate assembly for cylindrical batteries, such as... Figure 1 and Figure 2 As shown, the cover plate assembly includes a cover plate 1, a busbar 3, and terminals 2. Both the cover plate 1 and the busbar 3 are circular and are coaxially spaced apart. Multiple terminals 2 are inserted through the cover plate 1 and are spaced apart circumferentially along the cover plate 1. One end of each terminal 2 is welded to the busbar 3 to achieve electrical connection between the terminal 2 and the busbar 3. When used in cylindrical batteries, the cover plate 1 is connected to the open end of the battery casing to form a sealed cavity for housing the battery cells. The busbar 3 is located on the side of the cover plate 1 facing the inside of the battery and is welded to the tabs of the battery cells to achieve electrical connection between each terminal 2 and the battery cells.

[0027] On the side of the manifold 3 away from the cover plate 1, there are multiple protruding flow equalization ribs 31. The multiple flow equalization ribs 31 are radially distributed around the center of the manifold 3. That is, the multiple flow equalization ribs 31 are spaced apart along the circumference of the manifold 3, and the length direction of each flow equalization rib 31 extends along the radial direction of the manifold 3. Multiple current-equalizing ribs 31 are arranged in a one-to-one correspondence with multiple terminals 2, so that the multiple current-equalizing ribs 31 pass through the welding positions of the corresponding terminals 2. Thus, the multiple current-equalizing ribs 31 define multiple low-impedance paths with equal resistance values ​​corresponding to the multiple terminals 2 on the busbar 3, so as to achieve uniform current distribution, make the current flowing through each terminal 2 tend to be the same, and avoid local overheating. At the same time, the arrangement of current-equalizing ribs 31 also increases the conductor cross-sectional area of ​​the corresponding path of each terminal 2, thereby effectively reducing the resistance at the busbar connection, so as to reduce the internal resistance of the battery. In this way, the cover plate assembly of this application can be adapted to the use requirements of ultra-large capacity (such as 3000Ah and above) batteries.

[0028] In this embodiment, preferably, as follows: Figure 1 As shown, the cover plate assembly also includes a load connection plate 4, which is annular and disposed on the side of the cover plate 1 away from the busbar 3. The load connection plate 4 and the cover plate 1 are coaxially spaced apart. The end of each pole post 2 away from the busbar 3 is connected to the load connection plate 4.

[0029] Regarding the connection method between the pole post 2 and the load connection plate 4, the pole post 2 can be directly welded to the load connection plate 4 to achieve both mechanical and electrical connection. Alternatively, mechanical and electrical connection can be achieved through fasteners; for example, the end of the pole post 2 facing the load connection plate 4 has an internally threaded connection hole, and the load connection part has a through hole. Fasteners can pass through the through hole and be screwed into the internally threaded connection hole to lock the load connection plate 4 in a position that is tightly attached to the pole post 2, thereby achieving both mechanical and electrical connection between the load connection plate 4 and the pole post 2.

[0030] In this embodiment, preferably, multiple weight-reducing and clearance holes 32 are provided circumferentially at intervals on both the busbar 3 and the load connection plate 4, so as to reduce the weight of the cover plate assembly and improve the energy density of the battery while ensuring the busbar strength and structural stability.

[0031] In this embodiment, preferably, the busbar 3 and the cover plate 1 are integrally cast without a separate connecting structure, thereby effectively improving the overall structural stability of the cover plate assembly, reducing assembly steps, and improving production efficiency.

[0032] In this embodiment, preferably, a plurality of first mounting holes 11 are formed on the cover plate 1, and a plurality of pole posts 2 are inserted into the plurality of first mounting holes 11 in a corresponding manner. An insulating isolation sleeve 21 is fitted on the outside of each pole post 2 to insulate and isolate the cover plate 1 from each pole post 2.

[0033] like Figure 3 As shown, for any set of first mounting holes 11 and insulating sleeves 21, the outer wall of the insulating sleeve 21 has a first stepped portion, and the inner wall of the first mounting hole 11 has a second stepped portion. The insulating sleeve 21 can be sealed and embedded in the first mounting hole 11 in an interference fit manner, and the first stepped portion abuts against the second stepped portion. For any set of pole posts 2 and insulating sleeves 21, the inner wall of the insulating sleeve 21 has a third stepped portion, and the outer wall of the pole post 2 has a fourth stepped portion. The third stepped portion abuts against the fourth stepped portion, and both the third and fourth stepped portions have stepped surfaces perpendicular to the axial direction of the pole post 2. A first sealing element 22 is provided between the stepped surfaces of the two to achieve a sealed abutment between the pole post 2 and the insulating sleeve 21.

[0034] In one embodiment of this application, preferably, the cover plate assembly is used in an NFPP sodium-ion battery, which employs a sodium-based polyanion cathode and a hard carbon anode.

[0035] In this embodiment, preferably, the cover plate 1 has a reference diameter of 350mm to 500mm and a thickness of 5mm to 15mm, and is made of 3003-H14 series aluminum alloy to adapt to NFPP system sodium-ion large cylindrical batteries with an ultra-large diameter of 350mm to 500mm and a capacity of more than 3000Ah.

[0036] Preferably, the electrode post 2 is made of 1060 series pure aluminum, and the number of electrode posts 2 on the cover plate 1 is 6 to 12, with the diameter of each electrode post 2 being 20 to 50 mm. The number of flow equalization ribs 31 on the busbar 3 is the same as the number of electrode posts 2, and the cross-sectional area of ​​the flow equalization ribs 31 is ≥600 mm². 2 Meanwhile, the surface of the pole 2 is polished so that it can work with the large cross-sectional area flow equalization rib 31 to achieve no heat generation and no deformation under high current overcurrent conditions.

[0037] Preferably, the thickness of the busbar 3 is 6mm to 10mm; when welding each pole 2 to the busbar 3, the welding current is controlled at 200A to 250A to make the welding strength ≥150MPa, and a sealant layer (such as butyl sealant) is applied to the welding point between the pole 2 and the busbar 3 to take into account both high-strength conductive connection and sealing and anti-oxidation effect.

[0038] This allows the current sharing plate to work in tandem with the multi-electrode 2 to achieve a current capacity of not less than 3000 to 5000A, and to achieve uniform current distribution and effectively reduce battery internal resistance.

[0039] In one embodiment of this application, preferably, as shown below, Figure 1 , Figure 4 andFigure 5 As shown, the cover plate assembly also includes a one-way pressure relief valve 5, which includes a valve body with a protruding first connecting portion 51 formed at one end of the valve body.

[0040] The cover plate 1 has a second mounting hole 12, and the one-way pressure relief valve 5 is installed in the second mounting hole 12; regarding one preferred installation method of the one-way pressure relief valve 5, such as Figure 5 As shown, the first connecting part 51 is inserted into the second mounting hole 12. A third sealing ring groove is formed on the outer wall of the first connecting part 51, and a third sealing element 53 is filled in it, so that the first connecting part 51 is sealed against the wall of the second mounting hole 12 through the third sealing element 53. The valve body abuts against one side plate of the cover plate 1 (specifically the side plate facing the outside of the battery), and a second sealing ring groove is formed on the valve body, and a second sealing element 52 is filled in it, so that the valve body is sealed against the cover plate 1 through the second sealing element 52. At the same time, the valve body and the cover plate 1 are welded together along the circumference of the valve body. Thus, through welding and double sealing, the one-way pressure relief valve 5 is effectively sealed and installed on the cover plate 1.

[0041] Regarding another installation method for the one-way pressure relief valve 5, preferably, as follows: Figure 4 As shown, the outer wall of the first connecting part 51 is provided with an external threaded connection part, and the inner wall of the second mounting hole 12 is provided with an internal threaded connection part, so that the first connecting part 51 is screwed into the second mounting hole 12; at the same time, the valve body is also provided with a second sealing ring groove for mounting the second sealing element 52, so that the valve body and the cover plate 1 are sealed against each other. Thus, while ensuring the stability of the one-way pressure relief valve 5's sealed installation on the cover plate 1, the one-way pressure relief valve 5 is also detachable.

[0042] Meanwhile, the installation method of the one-way pressure relief valve 5 on the cover plate 1 in this application, compared with the existing through-type pressure relief valve, can avoid affecting the structural strength of the cover plate 1 and the arrangement of the multi-pole column 2.

[0043] In this embodiment, preferably, the one-way pressure relief valve 5 operates at a pressure of 0.2 to 0.4 MPa.

[0044] In one embodiment of this application, preferably as follows: Figure 1 , Figure 6 and Figure 7 As shown, the cover plate 1 is also provided with an injection hole, and the cover plate assembly also includes a sealing plug 6 for sealing and plugging the injection hole.

[0045] Regarding a structure of the sealing plug 6, preferably, as follows: Figure 6As shown, the sealing plug 6 includes a plug cap 61 and a second connecting portion 62 formed on the plug cap 61. The second connecting portion 62 has an external threaded connection portion, and the injection hole has an internal threaded connection portion, so that the second connecting portion 62 can be fitted into the injection hole until the nut 64 abuts against the side surface of the cover plate 1 away from the manifold 3. The nut 64 is provided with a fourth sealing ring groove, which contains a fourth sealing element, so that the nut 64 and the cover plate 1 seal against each other, thereby achieving the sealing and blocking of the injection hole by the sealing plug 6, and making the sealing plug 6 removable so that subsequent electrolyte replenishment can be carried out.

[0046] Regarding another structure of the sealing plug 6, preferably, as follows: Figure 7 As shown, the sealing plug 6 includes a screw 63 and a nut 64. The middle portion of the screw 63 forms an annular abutment. The wall of the injection hole has a fifth stepped portion. One end of the screw 63 is screwed into the injection hole, and the abutment is sealed against the fifth stepped portion through a fifth sealing element 65. The nut 64 is screwed to the other end of the screw 63, and the nut 64 is sealed against the cover plate 1 through a sixth sealing element 66. This effectively ensures the sealing plug 6 seals the injection hole and makes the sealing plug 6 removable for subsequent electrolyte replenishment.

[0047] In one embodiment of this application, preferably, an explosion-proof valve is also installed in the middle of the cover plate 1, and the area of ​​the explosion-proof valve is not less than 200 cm². The one-way pressure relief valve 5 can work with the large-area explosion-proof valve to form a dual safety pressure relief redundancy structure to improve the safety of battery use.

[0048] This application also provides a cylindrical battery including a cover assembly of any of the above embodiments.

[0049] In this embodiment, the cylindrical battery includes a cover assembly, and therefore the cylindrical battery has all the beneficial effects of the cover assembly, which will not be described in detail here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cover plate assembly for a cylindrical battery; characterized in that, The cover plate assembly includes a cover plate, a manifold, and an electrode post; The cover plate and the busbar are coaxially spaced apart. The poles are inserted through the cover plate. There are multiple poles, which are spaced apart along the circumference of the cover plate. One end of each pole is welded to the busbar. The side of the manifold away from the cover plate has flow equalization ribs. There are multiple flow equalization ribs, which are radially distributed around the center of the manifold. The multiple flow equalization ribs are arranged in a one-to-one correspondence with multiple pole posts.

2. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly also includes a load-bearing connection plate; The load connection plate is annular and located on the side of the cover plate away from the busbar. It is coaxially spaced from the cover plate. The end of each pole facing the load connection plate is welded to the load connection plate or fastened to it by fasteners.

3. The cover plate assembly according to claim 1, characterized in that, The cover plate has a plurality of first mounting holes, and the plurality of pole posts are inserted into the plurality of first mounting holes in a corresponding manner, and each pole post is fitted with an insulating sleeve on its outer side. The outer wall of the insulating sleeve is formed with a first stepped portion, and the inner wall of the first mounting hole is formed with a second stepped portion that abuts against the first stepped portion. The inner wall of the insulating sleeve forms a third step, and the outer wall of the pole forms a fourth step that abuts against the third step. A first seal is provided between the third step and the fourth step.

4. The cover plate assembly according to claim 1, characterized in that, It also includes a one-way pressure relief valve, which includes a valve body and a protruding first connecting portion formed at one end of the valve body; The cover plate has a second mounting hole, the valve body and the cover plate are sealed and welded together by a second sealing element, and the first connecting part is inserted into the second mounting hole; The outer wall of the first connecting part is fitted with a third sealing element to seal against the wall of the second mounting hole; or, the second mounting hole is provided with an internal threaded connecting part, and the first connecting part is provided with a matching external threaded connecting part, so that the first connecting part is screwed into the second mounting hole.

5. The cover plate assembly according to claim 1, characterized in that, The cover plate has an injection hole, and the cover plate assembly also includes a sealing plug for sealing the injection hole; The sealing plug includes a cap and a second connecting portion formed on the cap. The connecting portion is adapted to be screwed into the injection hole. The cap is sealed against the cover plate by a fourth sealing element. or, The sealing plug includes a screw and a nut, with an annular abutment portion formed in the middle of the screw; The wall of the injection hole is formed with a fifth step, one end of the screw is screwed into the injection hole, and the abutting part is sealed and abutted against the fifth step by a fifth sealing element; The nut is screwed to the other end of the screw rod, and the nut is sealed against the cover plate by a sixth sealing element.

6. The cover plate assembly according to claim 1, characterized in that, An explosion-proof valve is installed in the middle of the cover plate.

7. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly is used in sodium-ion batteries; The cover plate has a reference diameter of 350 mm to 500 mm; the cover plate has a thickness of 5 mm to 15 mm. The number of poles is 6 to 12; the diameter of the poles is 20 mm to 50 mm; The welding current between the electrode and the busbar is controlled at 200A to 250A, the welding strength is ≥150MPa, and the welding joint between the electrode and the busbar is coated with a sealant layer. The thickness of the busbar is 6mm to 10mm; The cross-sectional area of ​​the flow equalization rib is ≥600mm². 2 .

8. The cover plate assembly according to claim 2, characterized in that, Both the busbar and the load connection plate are provided with multiple weight-reducing and air-avoiding holes at intervals.

9. The cover plate assembly according to claim 1, characterized in that, Both the manifold and the cover plate are integrally cast.

10. A cylindrical battery, characterized in that, The cover assembly includes any one of claims 1 to 9.

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