Cover plate assembly, battery monomer and battery pack

Abstract

The utility model discloses a cover plate assembly, a battery monomer and a battery pack, and belongs to the technical field of batteries. The cover plate assembly comprises a first plate body which is provided with a first surface, a second surface and a first through hole penetrating through the first surface and the second surface, the pole is arranged in the first through hole in a penetrating manner; the pole fixing block is arranged towards the first surface, the pole fixing block is provided with a second through hole, the pole penetrates through the second through hole, and the pole is connected with the pole fixing block. By directly connecting the pole and the busbar, the resistance of current between the pole and the busbar is reduced, so that the overcurrent capability is improved, and the heat and energy loss at the joint of the pole and the busbar is reduced. Meanwhile, the pole fixing block further fixes and supports the pole, it is ensured that connection between the pole and the busbar is kept stable, instant high resistance caused by poor contact of the pole and the busbar is avoided, a solid guarantee is provided for continuous and stable passing of large current, and the reliability and practicability of the whole cover plate assembly are further improved.

Description

Technical Field

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

[0002] With the increasing capacity of individual battery cells, cells with capacities of 600Ah and even 1000Ah are the future design direction. Larger capacity can directly reduce the cost per watt-hour of battery cells. However, as capacity increases, the size of existing terminals increases, the stress on the terminal fixing blocks increases, and the rigidity of the top cover plate decreases, affecting the performance of the battery cells. Utility Model Content

[0003] Purpose of this application: This application provides a cover plate assembly to solve the problem that the riveting method of the battery cell and the busbar does not meet the overcurrent requirements of large capacity, thus affecting the performance of the battery cell; this application also provides a battery cell; this application also provides a battery pack.

[0004] Technical solution: This application provides a cover plate assembly, including:

[0005] The first plate has a first surface and a second surface disposed opposite to each other, and a first through hole penetrating the first surface and the second surface;

[0006] The pole post is inserted into the first through hole;

[0007] A pole fixing block is disposed facing the first surface. The pole fixing block has a second through hole, through which the pole passes and is connected to the pole fixing block. The pole is used to connect to the busbar.

[0008] In some embodiments, the pole post includes a first step, a second step, and a third step connected in sequence; the third step is disposed facing the second surface, the second step passes through the first through hole, the third step passes through the second through hole, and the third step is connected to the pole post fixing block.

[0009] In some embodiments, the pole fixing block has a third surface and a fourth surface disposed opposite to each other, the third surface being disposed toward the first surface;

[0010] The first step has a first side extending along the height direction and a first top surface perpendicular to the first side. The first side is connected to the wall of the second through hole, and the first top surface is in the same plane as the fourth surface.

[0011] In some embodiments, the second step has a second side extending along the height direction and a second top surface perpendicular to the second side, the second side being connected to the wall of the first through hole and the second top surface being connected to the third surface.

[0012] In some embodiments, the orthographic projection of the third surface along the height direction is at least partially located within the second top surface.

[0013] In some embodiments, the third step has a third side extending in the height direction and a third top surface perpendicular to the third side; the third top surface is disposed toward the second surface.

[0014] In some embodiments, it also includes:

[0015] The second plate is disposed between the second surface and the third top surface, and the second plate has a third through hole, through which the second step passes.

[0016] In some embodiments, it also includes:

[0017] A sealing element is disposed in the third through hole, conforms to the second surface and the third top surface, and is disposed around the second step.

[0018] In some embodiments, it also includes:

[0019] A third plate is disposed between the third surface and the first surface; the third plate has a fourth through hole, and the second step passes through the fourth through hole.

[0020] In some embodiments, the first side is welded to the wall of the second through hole, and the first step is welded to the busbar.

[0021] In some embodiments, the electrode post is a square electrode post or a round electrode post.

[0022] Accordingly, this application also provides a single battery cell, comprising:

[0023] A housing having a receiving space and an opening communicating with the receiving space;

[0024] The inner core is disposed within the receiving space;

[0025] As described in any of the above embodiments, the cover plate assembly covers the opening; the pole in the cover plate assembly is used to connect to the busbar.

[0026] Accordingly, this application also provides a battery pack, including:

[0027] Busbar;

[0028] Multiple battery cells as described in the above embodiments, wherein the busbar is connected to the terminals in the battery cells.

[0029] Beneficial Effects: Compared with the prior art, the cover plate assembly provided in this application includes: a first plate having a first surface, a second surface, and a first through hole penetrating the first and second surfaces; a pole post passing through the first through hole; and a pole post fixing block facing the first surface, the pole post fixing block having a second through hole through which the pole post passes, and the pole post and the pole post fixing block being connected. Thus, by directly connecting the pole post and the busbar, the resistance of the current between the pole post and the busbar is reduced, thereby improving the current carrying capacity between the pole post and the busbar, ensuring efficient and stable current transmission, and reducing heat and energy loss at the connection point between the pole post and the busbar. Simultaneously, the pole post fixing block also fixes and supports the pole post, ensuring a stable connection between the pole post and the busbar, avoiding instantaneous high resistance due to poor contact between the pole post and the busbar, providing a solid guarantee for the continuous and stable passage of large currents, and further improving the reliability and practicality of the entire cover plate assembly.

[0030] It is understood that, compared with the prior art, the battery cell provided in this application embodiment includes all the technical features and technical effects of the above-mentioned cover plate assembly, which will not be repeated here.

[0031] It is understood that, compared with the prior art, the battery pack provided in this application embodiment includes all the technical features and technical effects of the above-mentioned battery cells, which will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an exploded structural diagram of the cover plate assembly provided in an embodiment of this application;

[0034] Figure 2 A top view of the cover plate assembly provided in an embodiment of this application;

[0035] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0036] Figure 4 for Figure 3 A magnified view of a portion of region B in the middle;

[0037] Figure 5 A top view of the pole post in the cover plate assembly provided in the embodiments of this application;

[0038] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of CC.

[0039] Figure 7 Another structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0040] Figure 8 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 - Cover plate assembly; 110 - First plate; 111 - First surface; 112 - Second surface; 113 - First through hole; 120 - Pole post; 121 - First step; 1211 - First side surface; 1212 - First top surface; 122 - Second step; 1221 - Second side surface; 1222 - Second top surface; 123 - Third step; 1231 - Third side surface; 1232 - Third top surface; 130 - Pole post fixing block; 131 - Second through hole; 132 - Third surface; 133 - Fourth surface; 140 - Second plate; 141 - Third through hole; 150 - Seal; 160 - Third plate; 161 - Fourth through hole; 200 - Housing; 210 - Accommodation space; 220 - Opening; 300 - Inner core. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0045] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0046] In the conventional design of a battery cell, the terminal post 120 and the terminal post fixing block 130 are usually connected by riveting. However, the material expansion process during riveting leaves riveting holes on the surface of the terminal post 120, making the surface of the terminal post 120 uneven. This means that the terminal post 120 cannot be directly used for welding, so the busbar can only be welded to the terminal post fixing block 130.

[0047] As the capacity of individual battery cells continues to increase, in order to meet the high current requirements between the battery cell and the busbar, the size of the terminal block 130 should be increased to increase the effective welding area between the busbar and the terminal block 130. However, due to the limitations of the battery cell's own size, the terminal block 130 cannot be increased to a size sufficient to accommodate high current.

[0048] Furthermore, the riveted connection between the terminal post 120 and the terminal post fixing block 130 generates significant resistance. When overcurrent requirements increase, the contact area between the terminal post 120 and the terminal post fixing block 130 is prone to generating excessive heat due to resistance, resulting in excessively high temperatures and adversely affecting the performance of the battery cell.

[0049] In view of this, embodiments of this application provide a cover plate assembly 100 that directly connects the pole post 120 and the busbar to solve at least part of the above-mentioned technical problems.

[0050] Please see Figure 1 , Figure 1 An exploded view of the cover plate assembly provided in this application embodiment is shown. This application embodiment provides a cover plate assembly 100, including: a first plate 110, a pole post 120, and a pole post fixing block 130. The first plate 110 has a first surface 111 and a second surface 112 disposed opposite to each other, and a first through hole 113 penetrating the first surface 111 and the second surface 112; the pole post 120 passes through the first through hole 113; the pole post fixing block 130 is disposed facing the first surface 111, and the pole post fixing block 130 has a second through hole 131 through which the pole post 120 passes, and the pole post 120 and the pole post fixing block 130 are connected; the pole post 120 is used to connect to a busbar. In this way, by directly connecting the terminal 120 and the busbar, the resistance between the terminal 120 and the busbar is reduced, thereby improving the current carrying capacity between the terminal 120 and the busbar. This ensures that the current can be transmitted efficiently and stably, and reduces heat and energy loss at the connection point between the terminal 120 and the busbar. At the same time, the terminal fixing block 130 also fixes and supports the terminal 120, ensuring that the connection between the terminal 120 and the busbar remains stable. This avoids instantaneous high resistance caused by poor contact between the terminal 120 and the busbar, providing a solid guarantee for the continuous and stable passage of large currents, and further improving the reliability and practicality of the entire cover plate assembly 100.

[0051] Please see Figures 2 to 6 , Figure 2 The illustration shows a top view of the cover plate assembly provided in an embodiment of this application; Figure 3 It indicated Figure 2 Schematic diagram of the cross-sectional structure of AA; Figure 4 It indicated Figure 3 A magnified view of a portion of region B in the middle; Figure 5 The illustration shows a top view of the pole post in the cover plate assembly provided in the embodiment of this application; Figure 6 It indicated Figure 5A cross-sectional structural diagram of the CC; in some embodiments, the pole post 120 includes a first step 121, a second step 122, and a third step 123 connected in sequence; the third step 123 is disposed facing the second surface 112, the second step 122 passes through the first through hole 113, the third step 123 passes through the second through hole 131, and the third step 123 is connected to the pole post fixing block 130. Specifically, the pole post 120 consists of a first step 121, a second step 122, and a third step 123 connected in sequence, and the third step 123 is connected to the pole post fixing block 130. The stepped structure increases the contact area between the pole post 120 and the pole post fixing block 130, thereby dispersing the stress borne by the connection part, effectively reducing the risk of loosening of the connection between the pole post 120 and the pole post fixing block 130 due to external forces, thereby further ensuring the stability of the pole post 120 on the first plate 110 and improving the reliability of the entire cover plate assembly 100. Secondly, the second step 122 passes through the first through hole 113 of the first plate 110, and the third step 123 passes through the second through hole 131 of the pole post fixing block 130. The embodiments of this application provide a precise positioning reference for the assembly process through the step structure of different diameters, so as to quickly and accurately install the pole post 120 into the correct position.

[0052] Please refer to it again. Figures 2 to 6 In some embodiments, the pole fixing block 130 has a third surface 132 and a fourth surface 133 disposed opposite to each other, with the third surface 132 facing the first surface 111; the first step 121 has a first side surface 1211 extending along the height direction and a first top surface 1212 perpendicular to the first side surface 1211, the first side surface 1211 being connected to the wall of the second through hole 131, and the first top surface 1212 being in the same plane as the fourth surface 133. Thus, a tight connection is achieved through the third surface 132, the first side surface 1211, the wall of the second through hole 131, the first top surface 1212, and the fourth surface 133, increasing the bonding strength between the pole 120 and the pole fixing block 130, and providing a solid structural foundation for stable current transmission between the pole 120 and the busbar. Secondly, the fact that the first top surface 1212 and the fourth surface 133 are on the same plane helps to form a flatter and tighter contact interface when the terminal 120 is connected to the busbar, further reducing contact resistance, improving current carrying capacity, making the transmission of current between the terminal 120 and the busbar more efficient, and reducing energy loss and heat generation.

[0053] Please refer to it again. Figures 2 to 6In some embodiments, the second step 122 has a second side surface 1221 extending along the height direction and a second top surface 1222 perpendicular to the second side surface 1221. The second side surface 1221 is connected to the wall of the first through hole 113, and the second top surface 1222 is connected to the third surface 132. Specifically, the second side surface 1221, the wall of the first through hole 113, the second top surface 1222, and the third surface 132 form a double stable connection between the pole post 120 and the first plate 110 and the pole post fixing block 130, enhancing the stability of the pole post 120 and ensuring that the connection between the pole post 120 and the busbar is not affected by the displacement of the pole post 120 under complex working conditions, thus laying a solid structural foundation for stable current transmission. Secondly, the tightly connected second step 122 makes the electrical connection between the pole post 120 and the first plate 110 and the pole post fixing block 130 more reliable. When current flows through terminal 120 to the busbar, a stable connection reduces resistance changes caused by poor contact, further ensuring efficient current carrying capacity and reducing energy loss and heat generation during current transmission.

[0054] Please refer to it again. Figures 2 to 6 In some embodiments, the orthographic projection of the third surface 132 along the height direction is at least partially located within the second top surface 1222. Specifically, when the orthographic projection of the third surface 132 along the height direction is at least partially located within the second top surface 1222, the pressure distribution of the pole post fixing block 130 acting on the second step 122 is more uniform, making the connection between the pole post 120 and the pole post fixing block 130 more stable. Under complex working conditions, such as when the cover plate assembly 100 is subjected to external forces such as vibration and impact, the pole post 120, due to its stable connection structure, will hardly undergo displacement, thereby always maintaining a stable connection with the busbar, providing a more robust structural guarantee for the stability of current transmission.

[0055] Please refer to it again. Figures 2 to 6 In some embodiments, the third step 123 has a third side surface 1231 extending along the height direction and a third top surface 1232 perpendicular to the third side surface 1231; the third top surface 1232 is disposed facing the second surface 112. Thus, the third top surface 1232 being disposed facing the second surface 112 allows for a more effective connection between the third step 123 and the second surface 112 or other structures located on one side of the second surface 112. Simultaneously, the third side surface 1231 can also form a larger contact area with surrounding structures, such as other structures further fixing the pole post 120, thereby improving the stability of the pole post 120 on the second surface 112 side and further ensuring stable current transmission between the pole post 120 and the busbar.

[0056] Please refer to it again. Figure 1 and Figure 4In some embodiments, the cover plate assembly 100 further includes a second plate 140. The second plate 140 is disposed between the second surface 112 and the third top surface 1232, and has a third through hole 141 through which a second step 122 passes. Specifically, the second plate 140 is an internal insulator disposed between the second surface 112 and the third top surface 1232, thereby forming an insulating barrier between the electrode post 120 and the second surface 112. This not only prevents current leakage and avoids short-circuit risks, but also optimizes the electric field distribution of electrical components on one side of the electrode post 120 and the second surface 112, further reducing contact resistance, improving current transmission efficiency, and ensuring stable and safe current transmission between the electrode post 120 and the busbar. Simultaneously, the second step 122 passing through its third through hole 141 provides a precise positioning reference for the assembly of the electrode post 120.

[0057] Please refer to it again. Figure 1 and Figure 4 In some embodiments, the cover assembly 100 further includes a seal 150. The seal 150 is disposed in the third through hole 141, conforms to the second surface 112 and the third top surface 1232, and surrounds the second step 122. Specifically, the seal 150 provides an efficient sealing barrier, effectively preventing dust, moisture, and other impurities from entering the cover assembly 100. In humid environments or dusty conditions, it prevents electrical short circuits or corrosion caused by impurity accumulation, ensuring that the connection between the electrode post 120 and the busbar remains clean and maintains good electrical performance. Simultaneously, by blocking external moisture, the seal 150 reduces the risk of leakage or increased resistance between the electrode post 120 and the busbar due to moisture, maintaining low contact resistance and ensuring stable and efficient current transmission. Furthermore, while filling the gap in the third through hole 141, the seal 150 also provides auxiliary fixation for the electrode post 120. When the cover plate assembly 100 is subjected to vibration or external impact, the seal 150 can buffer part of the impact force, reduce the shaking of the pole post 120, further enhance the structural stability between the pole post 120 and the second plate 140, the first plate 110 and the pole post fixing block 130, ensure that the entire cover plate assembly 100 can still work normally under complex working conditions, and extend the service life of the pole post 120 and the entire cover plate assembly 100.

[0058] Please refer to it again. Figure 1 and Figure 4In some embodiments, the cover plate assembly 100 further includes a third plate 160 disposed between the third surface 132 and the first surface 111; the third plate 160 has a fourth through hole 161, and a second step 122 passes through the fourth through hole 161. Specifically, the third plate 160, as an external insulating member, is disposed between the third surface 132 and the first surface 111, and the second step 122 passes through its fourth through hole 161, which can build a reliable insulating barrier around the pole post 120, effectively preventing current leakage to the external environment and greatly reducing the risk of safety accidents caused by leakage. Secondly, the third plate 160 fills the space between the third surface 132 and the first surface 111, providing additional support and positioning for the pole post 120. When the cover plate assembly 100 is subjected to external forces such as vibration and impact, the third plate 160 can work together with the first plate 110 and the pole fixing block 130 to disperse the external forces, reduce the shaking and displacement of the pole 120, and ensure that the entire cover plate assembly 100 can still maintain good structural integrity under complex working conditions, and ensure the connection effectiveness between the pole 120 and the busbar.

[0059] In some embodiments, the first side surface 1211 is welded to the wall of the second through hole 131, and the first step 121 is welded to the busbar. Specifically, the welding connection between the first side surface 1211 and the wall of the second through hole 131 forms an extremely stable connection between the pole post 120 and the pole post fixing block 130. Even under severe vibration, impact, or other external force interference, the pole post 120 is unlikely to loosen or detach from the pole post fixing block 130, ensuring that the relative position of the pole post 120 remains unchanged under complex working conditions. At the same time, the welding connection between the first step 121 and the busbar further strengthens the connection strength between the pole post 120 and the busbar, ensuring the stability of the current transmission path and reducing contact problems caused by loose connections. In particular, the welding connection enables direct and tight contact between the pole post 120 and the busbar, greatly reducing contact resistance, reducing energy loss and heat generation, improving current transmission efficiency, and ensuring that the current passes stably and efficiently through the connection between the pole post 120 and the busbar.

[0060] Please refer to it again. Figure 1 Please refer to the following: Figure 7 , Figure 7This illustration shows another structural diagram of the cover plate assembly provided in an embodiment of this application. In some embodiments, the pole 120 is a square pole 120 or a round pole 120. Specifically, the square pole 120 can better fit square or rectangular installation spaces, reducing space waste. At the same time, the right-angled sides of the square pole 120 can fit more tightly into the internal frame structure of the cover plate assembly 100, facilitating a compact layout design, improving the space utilization of the entire cover plate assembly 100, and enabling the cover plate assembly 100 to integrate more functional modules within a limited space. In addition, the round pole 120 makes the electric field distribution more uniform when transmitting current, which can effectively reduce electric field distortion and reduce the risk of partial discharge caused by uneven electric field. It can be understood that the specific shape of the pole 120 can be selected according to actual use.

[0061] In summary, the cover plate assembly 100 provided in this application reduces the resistance between the terminal 120 and the busbar by directly connecting the terminal 120 and the busbar, thereby improving the current carrying capacity between the terminal 120 and the busbar, ensuring efficient and stable current transmission, and reducing heat and energy loss at the connection point between the terminal 120 and the busbar. Simultaneously, the terminal fixing block 130 also fixes and supports the terminal 120, ensuring a stable connection between the terminal 120 and the busbar, preventing instantaneous high resistance due to poor contact between the terminal 120 and the busbar, providing a solid guarantee for the continuous and stable passage of large currents, and further improving the reliability and practicality of the entire cover plate assembly 100.

[0062] Accordingly, please refer to Figure 8 , Figure 8 This illustration shows a structural diagram of a battery cell provided in an embodiment of this application. This application also provides a battery cell, including: a housing 200, an inner core 300, and a cover assembly 100 as described above. The housing 200 has a receiving space 210 and an opening 220 communicating with the receiving space 210; the inner core 300 is disposed within the receiving space 210; the cover assembly 100 covers the opening 220; and the terminal post 120 in the cover assembly 100 is used to connect to a busbar.

[0063] It is understood that, compared with the prior art, the battery cell provided in this application embodiment includes all the technical features and technical effects of the above-mentioned cover plate assembly 100, which will not be repeated here.

[0064] Accordingly, this application also provides a battery pack, including: a busbar; and a plurality of battery cells as described above, wherein the busbar is connected to the terminal post 120 in the battery cells.

[0065] Accordingly, this application also provides a battery pack, including any of the individual battery cells as described in the above embodiments. The battery pack is used to store and release electrical energy, and may further include a housing and multiple of the aforementioned battery cells, with the multiple battery cells housed within the housing. The battery pack can be a charge-discharge structure composed of multiple battery cells, such as a battery module, battery pack, battery cluster, battery stack, battery tower, or battery array. Battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments disclosed herein do not limit this to any particular type.

[0066] It is understood that, compared with the prior art, the battery pack provided in this application embodiment includes all the technical features and technical effects of the above-mentioned single battery cells, which will not be repeated here.

[0067] Accordingly, this application also provides an electrical device, including a battery pack as described in the above embodiments. This electrical device can be various types of equipment such as new energy vehicles, computers, and energy storage power supply devices.

[0068] It is understood that, compared with the prior art, the electrical device provided in this application embodiment includes all the technical features and technical effects of the above-mentioned battery pack, and will not be repeated here.

[0069] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0070] The foregoing has provided a detailed description of a cover plate assembly, a battery cell, and a battery pack provided in the embodiments of this application, and has used specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some 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 this application.

Claims

1. A cover assembly, characterized by The utility model relates to a battery terminal fixing structure, including: A first plate body (110) has oppositely arranged first surface (111), second surface (112) and first through hole (113) through the first surface (111) and the second surface (112); Pole (120) is arranged in the first through hole (113); Pole fixing block (130) is arranged towards the first surface (111), the pole fixing block (130) has second through hole (131), the pole (120) is arranged in the second through hole (131), and the pole (120) and the pole fixing block (130) are connected, and the pole (120) is used for connecting with busbar.

2. The cover plate assembly of claim 1, wherein, The pole (120) includes sequentially connected first step (121), second step (122) and third step (123);The third step (123) is arranged towards the second surface (112), the second step (122) is arranged in the first through hole (113), the third step (123) is arranged in the second through hole (131), and the third step (123) and the pole fixing block (130) are connected.

3. The cover plate assembly of claim 2, wherein, The pole fixing block (130) has oppositely arranged third surface (132) and fourth surface (133), and the third surface (132) is arranged towards the first surface (111); The first step (121) has first side surface (1211) extending along the height direction, and first top surface (1212) perpendicular to the first side surface (1211), and the first side surface (1211) is connected with the hole wall of the second through hole (131), and the first top surface (1212) is in the same plane with the fourth surface (133).

4. The cover plate assembly of claim 3, wherein, The second step (122) has second side surface (1221) extending along the height direction, and second top surface (1222) perpendicular to the second side surface (1221), and the second side surface (1221) is connected with the hole wall of the first through hole (113), and the second top surface (1222) is connected with the third surface (132).

5. The cover plate assembly of claim 4, wherein, Along the height direction, the orthographic projection of the third surface (132) is at least partially located in the second top surface (1222).

6. The cover plate assembly of claim 2, wherein, The third step (123) has third side surface (1231) extending along the height direction, and third top surface (1232) perpendicular to the third side surface (1231);The third top surface (1232) is arranged towards the second surface (112).

7. The cover plate assembly of claim 6, wherein, Further including: Second plate body (140), the second plate body (140) is arranged between the second surface (112) and the third top surface (1232), and the second plate body (140) has third through hole (141), and the second step (122) is arranged in the third through hole (141).

8. The cover plate assembly of claim 7, wherein, Further including: Seal (150), the seal (150) is arranged in the third through hole (141), and is fitted with the second surface (112) and the third top surface (1232), and is arranged around the second step (122).

9. The cover plate assembly of claim 4, wherein, Also included are: a third plate body (160) disposed between the third surface (132) and the first surface (111); the third plate body (160) has a fourth through hole (161), and the second step (122) is disposed through the fourth through hole (161).

10. The cover plate assembly of claim 3, wherein, The first side surface (1211) is welded to the hole wall of the second through hole (131), and the first step (121) is welded to the bus bar.

11. The cover plate assembly of any one of claims 1 to 10, wherein, The pole column (120) is a square pole column or a round pole column.

12. A battery cell, characterized by Included are: a housing (200) having an accommodation space (210) and an opening (220) communicating with the accommodation space (210); an inner core (300) disposed in the accommodation space (210); The cover plate assembly (100) according to any one of claims 1 to 11, the cover plate assembly (100) covers the opening (220); the pole column (120) in the cover plate assembly (100) is used for connecting with the bus bar.

13. A battery pack, characterized by Included are: a bus bar; a plurality of battery monomers according to claim 12, and the bus bar is connected with the pole column (120) in the battery monomer.

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