Battery cover plate assembly, battery module and battery pack

Abstract

The utility model relates to battery technology field provides a kind of battery cover plate assembly, battery module and battery package, battery cover plate assembly includes battery top cover, forms with step face, step face includes the first surface and second surface with height difference;Battery terminal is set on battery top cover, straddles and is set in the first surface and second surface, to make the part of battery terminal corresponding to the first surface and the part corresponding to the second surface form corresponding step face step structure.The battery cover plate assembly provided by the utility model forms the step structure corresponding to the step face by the battery terminal itself.The step structure makes the external pressure transmission path of battery terminal from traditional plane contact, converts into multistage bearing, step structure cooperates with the step face on battery top cover, disperses stress concentration, improves the bending stiffness of battery top cover, avoids the problem that battery cover plate assembly is prone to plastic deformation in stress concentration area.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover assembly, a battery module, and a battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage equipment, the requirements for battery structural safety and energy density are increasing. As a pressure-bearing component of the battery cell, the structural design of the battery cover directly affects the battery's sealing performance, deformation resistance, and service life.

[0003] In traditional battery cover assemblies, battery terminals are typically fixed to the flat surface of the battery top cover by welding or riveting. When gas is generated inside the battery or external mechanical loads are applied to the battery terminals, the pressure is directly transmitted to the surface of the battery top cover. Due to the limited thickness of the battery top cover (which needs to balance lightweighting and cost), its bending stiffness is insufficient, making it prone to plastic deformation in areas of stress concentration. This can lead to sealing failure, electrolyte leakage, or even short circuit risks. Utility Model Content

[0004] This utility model provides a battery cover assembly, a battery module, and a battery pack to solve the problem of insufficient bending stiffness of existing battery top covers, which easily leads to plastic deformation in areas of stress concentration.

[0005] This utility model provides a battery cover assembly, including: The battery top cover has a stepped surface, the stepped surface including a first surface and a second surface having a height difference; A battery terminal is disposed on the top cover of the battery, spanning the first surface and the second surface, such that the portion of the battery terminal corresponding to the first surface and the portion corresponding to the second surface form a stepped structure corresponding to the stepped surface.

[0006] According to the present invention, a battery cover assembly further includes: The terminal is inserted into the top cover of the battery and the battery terminals, and the terminal is electrically connected to the battery terminals.

[0007] According to the present invention, a battery cover assembly is provided, wherein the battery terminal comprises: a first part, a stepped structure, and a second part; The first portion extends to the first surface, and the electrode post passes through the battery top cover and the first portion, with the first portion being electrically connected to the electrode post; The second portion extends to the second surface; The two ends of the stepped structure are connected to the first part and the second part, respectively.

[0008] According to the present invention, a battery cover assembly is provided in which the first part, the stepped structure and the second part are integrally formed.

[0009] According to the present invention, the height of the second part on the battery top cover is greater than the height of the first part on the battery top cover. The battery cover assembly further includes a switch plate, which is disposed on the first part and electrically connected to the electrode post.

[0010] According to the present invention, a battery cover assembly is provided, wherein the battery top cover has a plurality of stepped surfaces, and the battery terminals and the pole posts are provided with a plurality of corresponding arrangements; Each of the battery terminals is disposed on the corresponding stepped surface, and each of the terminals passes through the battery top cover and the corresponding battery terminal.

[0011] According to the present invention, a battery cover assembly further includes: A first insulating element is disposed between the battery top cover and the battery terminals; The second insulating element is disposed on the side of the battery top cover opposite to the battery terminals.

[0012] This utility model also provides a battery module, including: The battery housing, electrode assembly, and battery cover assembly are provided, wherein the electrode assembly is located inside the battery housing and the battery cover assembly is fixed to the opening of the battery housing.

[0013] This utility model also provides a battery pack, including: The battery casing has an internal cavity. The aforementioned battery module is disposed in the receiving cavity, and the inner wall surface of the battery housing abuts against at least a portion of the battery terminals.

[0014] According to the present invention, a battery pack further includes: A cooling plate having a cooling surface is formed thereon, and the cooling surface abuts against the battery terminal.

[0015] The battery cover assembly, battery module, and battery pack provided by this utility model, through the setting of the stepped surface of the battery top cover, allow the battery terminals to span across a first surface and a second surface with different height differences, and the battery terminals themselves form a stepped structure corresponding to the stepped surface. This stepped structure transforms the external pressure transmission path of the battery terminals from traditional planar contact to multi-level load bearing. The stepped structure, together with the stepped surface on the battery top cover, disperses stress concentration, improves the bending stiffness of the battery top cover, and avoids the problem of plastic deformation of the battery cover assembly in stress concentration areas. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery cover assembly provided by this utility model.

[0018] Figure 2 This is an internal schematic diagram of the battery cover assembly provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the battery module provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the battery pack provided by this utility model.

[0021] Figure 5 This is a disassembly diagram of the battery pack provided by this utility model.

[0022] Figure 6 This is a cross-sectional schematic diagram of the inside of the battery pack provided by this utility model.

[0023] Figure label: 1. Battery module; 11. Battery cover assembly; 111. Battery top cover; 1111. First surface; 1112. Second surface; 112. Battery terminal; 1121. Stepped structure; 113. Terminal post; 114. Bar plate; 115. First insulating component; 116. Second insulating component; 12. Battery casing; 2. Battery housing; 21. Cover plate; 22. Lower casing; 3. Cooling plate. Detailed Implementation

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0026] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the 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, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] The following is combined Figures 1-6 This invention describes the battery cover assembly 11, battery module 1, and battery pack provided by this utility model.

[0029] This application provides a battery cover assembly 11, such as... Figures 1 to 3 As shown, the battery cover assembly 11 includes a battery top cover 111 and battery terminals 112. The battery top cover 111 has a stepped surface, which includes a first surface 1111 and a second surface 1112 having a height difference. The battery terminals 112 are disposed on the battery top cover 111, and the battery terminals 112 span across the first surface 1111 and the second surface 1112, such that the portion of the battery terminals 112 corresponding to the first surface 1111 and the portion corresponding to the second surface 1112 form a stepped structure 1121 corresponding to the stepped surface.

[0030] The battery top cover 111 is formed by precision stamping to create a stepped surface with a height difference. This stepped surface consists of a first surface 1111 (lower surface) and a second surface 1112 (higher surface), with a reasonable height difference of 0.5-3mm between them. The battery terminals 112 are made of a highly conductive material and are mounted on the stepped surface using laser welding. The portion corresponding to the first surface 1111 forms an upper step, and the portion corresponding to the second surface 1112 forms a lower step, thus forming a stepped structure 1121 that perfectly corresponds to the stepped surface.

[0031] The stepped structure 1121 creates a multi-level stress transmission path. When the battery terminal 112 is subjected to external impact, the stress is distributed and transmitted in multiple dimensions. Longitudinal stress is distributed in stages through the height difference of the steps, and the stepped structure 1121, in conjunction with the stepped surface on the battery top cover 111, disperses stress concentration. Lateral stress diffuses radially along the step bends. Simultaneously, the stepped surface on the entire battery top cover 111 enhances the bending stiffness of the battery top cover 111 itself. The battery cover assembly 11 provided by this utility model, through the setting of the stepped surface of the battery top cover 111, allows the battery terminals 112 to span across the first surface 1111 and the second surface 1112 with different height differences. The battery terminals 112 themselves form a stepped structure 1121 corresponding to the stepped surface. This stepped structure 1121 transforms the external pressure transmission path of the battery terminals 112 from traditional planar contact to multi-level bearing. The stepped structure 1121, together with the stepped surface on the battery top cover 111, disperses stress concentration, improves the bending stiffness of the battery top cover 111, and avoids the problem of plastic deformation of the battery cover assembly 11 in the stress concentration area.

[0032] In some embodiments, such as Figures 1 to 3 As shown, the battery cover assembly 11 also includes a terminal post 113, which passes through the battery top cover 111 and the battery terminal 112, and the terminal post 113 is electrically connected to the battery terminal 112.

[0033] Specifically, in this embodiment, the terminal post 113, as the core component for current conduction, is made of a metal material with high conductivity and low resistance, such as copper, aluminum, or their alloys, to ensure efficient and stable current transmission. The terminal post 113 has a columnar structure, and its outer diameter matches the preset mounting holes on the battery top cover 111 and the corresponding preset through holes on the battery terminals 112, ensuring that the terminal post 113 can be accurately inserted into the battery top cover 111 and the battery terminals 112 for stable installation.

[0034] To further improve the reliability of the electrical connection between the terminal post 113 and the battery terminal 112, the outer peripheral surface of the terminal post 113 is fixed to the inner wall of the pre-set through hole of the battery terminal 112 by interference fit or welding. Preferably, the terminal post 113 and the battery terminal 112 are electrically connected by laser welding. Laser welding not only ensures the conductivity of the connection, but also effectively avoids contact resistance problems caused by mechanical connection, thereby improving the overall performance and service life of the battery.

[0035] In some embodiments, such as Figures 1 to 3 As shown, the battery terminal 112 includes: a first part, a stepped structure 1121 and a second part; the first part extends to a first surface 1111, and the terminal post 113 passes through the battery top cover 111 and the first part, and the first part is electrically connected to the terminal post 113; the second part extends to a second surface 1112; the two ends of the stepped structure 1121 are connected to the first part and the second part respectively.

[0036] Specifically, the first part is the low-position connection area of ​​the battery terminal 112, which extends horizontally from the main body of the battery terminal 112 to the first surface 1111 (low-position surface), and its lower surface is in contact with or has a slight gap with the first surface 1111. This first part has a through hole coaxial with the terminal post 113. The terminal post 113 passes through the mounting hole of the battery top cover 111 and the through hole of the first part from bottom to top, and forms a firm electrical and mechanical connection with the first part by laser welding, resistance welding or riveting, so as to realize the current conduction between the internal electrode group of the battery and the external circuit.

[0037] The second part is a high-level transition area, extending in the opposite direction to the first part to the second surface 1112 (high-level surface), with its lower surface fitting or having a micro-gap fit with the second surface 1112. The second part can continue to extend outward to form tabs, bus welding areas, or external sampling interfaces to adapt to the rapid assembly of modules or pack-level busbars, sampling FPCs, and other components.

[0038] The stepped structure 1121 connects the first part and the second part, and bends in a Z-shape or inverted V-shape. Its bending height precisely matches the height difference (0.5–3 mm) between the first surface 1111 and the second surface 1112. The two ends of the stepped structure 1121 are connected to the first part and the second part respectively by arc transition or chamfer transition to reduce stress concentration.

[0039] When the battery terminal 112 is subjected to external vibration, impact, or deformation caused by thermal expansion and contraction, the longitudinal load is transferred in stages to the first surface 1111 and the second surface 1112 through the height difference of the stepped structure 1121, avoiding single-path overload. Lateral displacement can be absorbed by slight elastic deformation at the bend of the stepped structure 1121, reducing the tension on the welding area of ​​the terminal post 113. Because the first part and the second part are respectively attached to surfaces at different heights, the whole forms a multi-faceted support, which significantly improves the local stiffness of the battery top cover 111.

[0040] To increase the overall strength of the battery terminal 112, the first part, the stepped structure 1121, and the second part are generally integrally formed. For example, the first part, the stepped structure 1121, and the second part are preferably integrally formed by stamping and bending using a high-conductivity copper alloy or aluminum-magnesium-silicon alloy. The entire battery terminal 112 is free of rivets and solder joints, which eliminates the contact resistance and fatigue crack sources that may be caused by separate connections, and allows stress to be continuously and uniformly transmitted between the three sections, significantly improving the fatigue life of the terminal under vibration and impact conditions.

[0041] In some examples, such as Figures 1 to 6 As shown, the height of the second part on the battery top cover 111 is greater than the height of the first part on the battery top cover 111; the battery cover assembly 11 also includes a tab 114. The tab 114 is disposed on the first part and is electrically connected to the terminal post 113.

[0042] In this embodiment, the second part has a higher vertical height on the battery top cover 111 than the first part, forming a high-position output terminal to adapt to the bus arrangement requirements of higher module or PACK levels; while the first part remains low-positioned, which facilitates a compact stacked connection with the pole post 113 and the plate 114, thereby achieving efficient utilization of Z-axis space without increasing the overall thickness of the cover plate 21.

[0043] The electrode 114 can be a thin, rigid conductive sheet, made of the same material as the battery terminal 112, or plated with nickel or silver to improve its oxidation resistance. The electrode 114 is welded onto the first part. The upper surface of the electrode 114 can also be equipped with positioning posts, anti-rotation bosses, or clips for quick positioning with the module frame or sampling PCB. In addition, the outer edge of the electrode 114 can be punched with elastic finger-like structures to serve as the crimping area for temperature sensors or voltage sampling lines, realizing the integrated integration of signal and power.

[0044] When the battery top cover 111 needs to be compatible with complex electrical topologies such as multi-pole parallel output, pole sampling, or high and low voltage isolation, its surface no longer retains only a single step surface, but instead has several sets of step surfaces processed in an array along the long or short side.

[0045] like Figures 1 to 3As shown, the battery top cover 111 can form multiple stepped surfaces as needed. The height difference between the first surface 1111 and the second surface 1112 of each set of stepped surfaces remains in the range of 0.5–3 mm. However, the height between adjacent stepped surfaces can be the same, or it can increase or decrease in a step-like manner according to the direction of the module busbar to match the three-dimensional spatial wiring requirements.

[0046] At this time, multiple battery terminals 112 and pole posts 113 are provided, with the number of battery terminals 112 corresponding to the stepped surface and the number of pole posts 113 corresponding to the stepped surface. Each battery terminal 112 is set on the corresponding stepped surface, and each pole post 113 passes through the battery top cover 111 and the corresponding battery terminal 112.

[0047] For scenarios requiring parallel high current output, the second part of two or three adjacent battery terminals 112 can be connected together through continuous plates 114 or other conductive parts to achieve integrated output of multi-terminal single bus, simplifying the structure and reducing assembly difficulty.

[0048] Through the array-like arrangement of the multi-step surface, multi-terminal, and multi-pole post 113, the battery top cover 111 can flexibly adapt to various electrical function requirements such as parallel capacity expansion, polarity sampling, and high and low voltage isolation while maintaining the original advantages of stress dispersion and improved bending stiffness, thus achieving the dual goals of structural integration and functional integration.

[0049] In some embodiments, such as Figures 1 to 3 As shown, the battery cover assembly 11 also includes a first insulating component 115 and a second insulating component 116. The first insulating component 115 is an upper plastic component, injection molded from plastic, and is located between the battery top cover 111 and the battery terminals 112, primarily serving the triple functions of electrical isolation, mechanical buffering, and sealing protection. The second insulating component 116 is a lower plastic component, also made of insulating material resistant to high temperatures and electrolyte corrosion. It is located on the side of the battery top cover 111 opposite to the battery terminals 112, primarily serving the functions of bottom insulation protection and structural reinforcement.

[0050] This application embodiment also provides a battery module 1, such as Figures 1 to 3As shown, the battery module 1 includes a battery housing 12, electrode groups, and a battery cover assembly 11. The electrode groups are located inside the battery housing 12, and the battery cover assembly 11 is fixed to the opening of the battery housing 12. The battery cover assembly 11 includes a battery top cover 111 and battery terminals 112. The battery top cover 111 has a stepped surface, which includes a first surface 1111 and a second surface 1112 having a height difference. The battery terminals 112 are disposed on the battery top cover 111, and the battery terminals 112 span across the first surface 1111 and the second surface 1112, so that the portion of the battery terminals 112 corresponding to the first surface 1111 and the portion corresponding to the second surface 1112 form a stepped structure 1121 corresponding to the stepped surface.

[0051] In this embodiment, the battery top cover 111 is formed with a stepped surface of height difference using a precision stamping process. This stepped surface consists of a first surface 1111 (lower surface) and a second surface 1112 (higher surface), with a reasonable height difference of 0.5-3mm between them. The battery terminals 112 are made of a highly conductive material and are mounted on the stepped surface using a laser welding process. The portion corresponding to the first surface 1111 forms an upper step, and the portion corresponding to the second surface 1112 forms a lower step, thus forming a stepped structure 1121 that completely corresponds to the stepped surface.

[0052] The stepped structure 1121 creates a multi-level stress transmission path. When the battery terminal 112 is subjected to external impact, the stress is distributed and transmitted in multiple dimensions. Longitudinal stress is distributed in stages through the height difference of the steps, and the stepped structure 1121, in conjunction with the stepped surface on the battery top cover 111, disperses stress concentration. Lateral stress diffuses radially along the step bends. Simultaneously, the stepped surface on the entire battery top cover 111 enhances the bending stiffness of the battery top cover 111 itself.

[0053] The battery module 1 provided by this utility model includes the aforementioned battery cover assembly 11. Through the stepped surface of the battery top cover 111, the battery terminals 112 span across the first surface 1111 and the second surface 1112, which have different height differences. The battery terminals 112 themselves form a stepped structure 1121 corresponding to the stepped surface. This stepped structure 1121 transforms the external pressure transmission path of the battery terminals 112 from traditional planar contact to multi-level load bearing. The stepped structure 1121, in conjunction with the stepped surface on the battery top cover 111, disperses stress concentration, improves the bending stiffness of the battery top cover 111, and avoids the problem of plastic deformation of the battery cover assembly 11 in stress concentration areas.

[0054] This application also provides a battery pack, such as... Figures 1 to 6As shown, the battery pack includes a battery housing 2 and a battery module 1. The battery module 1 is disposed in the receiving cavity and includes a battery casing 12, an electrode assembly, and a battery cover assembly 11. The electrode assembly is located inside the battery casing 12, and the battery cover assembly 11 is fixed to the opening of the battery casing 12. The battery cover assembly 11 includes a battery top cover 111 and battery terminals 112. The battery top cover 111 has a stepped surface, which includes a first surface 1111 and a second surface 1112 having a height difference. The battery terminals 112 are disposed on the battery top cover 111, spanning the first surface 1111 and the second surface 1112, such that the portion of the battery terminals 112 corresponding to the first surface 1111 and the portion corresponding to the second surface 1112 form a stepped structure 1121 corresponding to the stepped surface. The inner wall of the battery housing abuts against at least a portion of the battery terminals 112.

[0055] In this embodiment, the battery top cover 111 is formed with a stepped surface having a height difference using a precision stamping process. This stepped surface is composed of a first surface 1111 (lower surface) and a second surface 1112 (higher surface). The battery terminals 112 are made of a highly conductive material and are mounted on the stepped surface using a laser welding process. The portion corresponding to the first surface 1111 forms an upper step, and the portion corresponding to the second surface 1112 forms a lower step, thereby forming a stepped structure 1121 that completely corresponds to the stepped surface.

[0056] The battery housing 2 includes an upper cover and a lower housing 22 that are joined together vertically. The bottom surface of the upper cover abuts against the portion of the battery terminal 112 corresponding to the second surface 1112 (the second part). At the same time, when a tab 114 is provided on the portion of the battery terminal 112 corresponding to the first surface 1111 (the first part), the bottom surface of the upper cover is also provided on the first part via the tab 114. In this case, the battery terminal 112 can support the entire upper cover.

[0057] When the battery terminal 112 is subjected to external impact through the top cover, the stress is distributed and transmitted in multiple dimensions. Longitudinal stress is distributed in stages through the step height difference, and the step structure 1121, in conjunction with the step surface on the battery top cover 111, disperses stress concentration. Lateral stress diffuses radially along the step bends. Simultaneously, the step surface on the entire battery top cover 111 enhances the structural bending stiffness.

[0058] The battery pack provided by this utility model includes the aforementioned battery module 1. Through the stepped surface of the battery top cover 111, the battery terminals 112 span across the first surface 1111 and the second surface 1112, which have different height differences. The battery terminals 112 themselves form a stepped structure 1121 corresponding to the stepped surface. This stepped structure 1121 transforms the external pressure transmission path of the battery terminals 112 from traditional planar contact to multi-level load bearing. The stepped structure 1121, in conjunction with the stepped surface on the battery top cover 111, disperses stress concentration, improves the bending stiffness of the battery top cover 111, and avoids the problem of plastic deformation of the battery cover assembly 11 in areas of stress concentration.

[0059] To achieve a cooling effect on the battery pack, such as Figures 4 to 6 As shown, the battery pack also includes a cooling plate 3. The cooling plate 3 has a cooling surface that abuts against the battery terminal 112.

[0060] Generally, since the height of the second surface 1112 is higher than that of the first surface 1111, a step is also formed on the battery terminal 112. The cooling surface generally only abuts against the first part of the battery terminal 112. Since the first part, the step structure 1121 and the second part on the entire battery terminal 112 are integrally formed, the cooling plate 3 can also cool the entire battery terminal 112.

[0061] When the bar plate 114 is set on the first part, a part of the cooling surface directly abuts against the first part, and the other part is set on the bar plate 114. At this time, the cooling plate 3 can also cool the entire battery terminal 112.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cover assembly, characterized in that, include: The battery top cover has a stepped surface, the stepped surface including a first surface and a second surface having a height difference; A battery terminal is disposed on the top cover of the battery, spanning the first surface and the second surface, such that the portion of the battery terminal corresponding to the first surface and the portion corresponding to the second surface form a stepped structure corresponding to the stepped surface.

2. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly also includes: The terminal is inserted into the top cover of the battery and the battery terminals, and the terminal is electrically connected to the battery terminals.

3. The battery cover assembly according to claim 2, characterized in that, The battery terminal includes: a first part, a stepped structure, and a second part; The first portion extends to the first surface, and the electrode post passes through the battery top cover and the first portion, with the first portion being electrically connected to the electrode post; The second portion extends to the second surface; The two ends of the stepped structure are connected to the first part and the second part, respectively.

4. The battery cover assembly according to claim 3, characterized in that, The first part, the stepped structure, and the second part are integrally formed.

5. The battery cover assembly according to claim 3, characterized in that, The second part is at a greater height on the battery top cover than the first part is at a greater height on the battery top cover; The battery cover assembly further includes a switch plate, which is disposed on the first part and electrically connected to the electrode post.

6. The battery cover assembly according to claim 2, characterized in that, The battery top cover has multiple stepped surfaces, and the battery terminals and the poles are provided with multiple corresponding surfaces. Each of the battery terminals is disposed on the corresponding stepped surface, and each of the terminals passes through the battery top cover and the corresponding battery terminal.

7. The battery cover assembly according to any one of claims 1-6, characterized in that, The battery cover assembly also includes: A first insulating element is disposed between the battery top cover and the battery terminals; The second insulating element is disposed on the side of the battery top cover opposite to the battery terminals.

8. A battery module, characterized in that, include: The battery housing, the electrode assembly, and the battery cover assembly as described in any one of claims 1-7, wherein the electrode assembly is located inside the battery housing and the battery cover assembly is fixed to the opening of the battery housing.

9. A battery pack, characterized in that, include: The battery casing has an internal cavity. The battery module as described in claim 8 is disposed in the receiving cavity, and the inner wall surface of the battery housing abuts against at least a portion of the battery terminals.

10. The battery pack according to claim 9, characterized in that, The battery pack also includes: A cooling plate having a cooling surface is formed thereon, and the cooling surface abuts against the battery terminal.

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