Pole, top cover assembly, battery monomer, battery and power utilization device

Abstract

The utility model relates to a pole, a top cover assembly, a battery monomer, a battery and an electric device. The pole comprises at least one first connecting part and at least two second connecting parts, the at least two second connecting parts are arranged at intervals along a first preset direction, one first connecting part is arranged between every two adjacent second connecting parts, and each first connecting part is connected with the two adjacent second connecting parts; the first connecting part is used for being connected with an electric connecting piece, and the second connecting part is used for being connected with a tab.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an electrode post, a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] Lithium-ion batteries have advantages such as high energy density, long cycle life, high rate performance, good safety, and environmental friendliness, making them an important energy product for modern electronic products and electric vehicles. The battery cell is a crucial component of the battery.

[0003] There are two technical solutions for battery cells: those with adapter plates and those without. In the adapter plate solution, the tabs of the cell are led out to the terminals via the adapter plate, making the terminals the electrode terminals of the battery cell. However, the presence of the adapter plate increases the number of parts, thus increasing battery cost; furthermore, it adds a welding process between the tabs and the adapter plate, further increasing battery cost.

[0004] In adapter-less designs, the terminal and tab are directly connected. However, due to limited space on the cover plate, the position of the terminal is restricted, necessitating the use of extended tabs to achieve direct connection. Extended tabs significantly increase the risk of the tab being inserted backwards into the cell and of the tab tearing. Utility Model Content

[0005] Therefore, it is necessary to provide a terminal post, top cover assembly, battery cell, battery, and power device that can eliminate the need for adapters and avoid lengthening the electrode tabs, in order to address the above problems.

[0006] On one hand, this application provides a pole post, including at least one first connecting part and at least two second connecting parts, the at least two second connecting parts are arranged at intervals along a first preset direction, and a first connecting part is provided between each two adjacent second connecting parts, and each first connecting part is connected to the two adjacent second connecting parts; the first connecting part is used to connect with an electrical connector, and the second connecting parts are used to connect with a tab.

[0007] In some embodiments, on a dummy plane perpendicular to the thickness direction of the pole post, the orthographic projection of the first connecting portion does not overlap with the orthographic projection of each of the second connecting portions.

[0008] In some embodiments, the first connecting portion and each of the second connecting portions are integrally formed.

[0009] In some embodiments, the first connecting portion and each of the second connecting portions are integrally formed by stamping.

[0010] In some embodiments, there are two second connecting portions, which are respectively connected to the first connecting portion on both sides of the first connecting portion in the first preset direction.

[0011] In some embodiments, the distance W2 between the ends of the two second connecting portions that are far apart from each other is 20mm-70mm.

[0012] In some embodiments, the dimension W6 of each second connection portion in the second preset direction is 20mm to 60mm, and the first preset direction, the second preset direction and the thickness direction of the pole post are perpendicular to each other.

[0013] In some embodiments, the first connecting portion has a first surface on one side of the pole post in the thickness direction, each second connecting portion has a second surface on one side of the pole post in the thickness direction, the second surface and the first surface are located on the same side of the pole post in the thickness direction, and the first connecting portion also has a third surface opposite to the first surface, the second surface being located on the side of the first surface away from the third surface.

[0014] In some embodiments, each of the second connecting portions further has a fourth surface opposite to the second surface;

[0015] The third surface protrudes in the thickness direction of the pole post from the side of the second connecting portion that has the fourth surface.

[0016] In some embodiments, each of the second connecting portions includes a first region and a second region surrounding the first region, the second region being connected to the first connecting portion, and the first region protruding relative to the second region toward a side away from the third surface to form a connecting sub-portion.

[0017] In some embodiments, the portion of the second surface located in the connecting sub-part is a fifth surface, and part of the fifth surface is a plane parallel to the third surface.

[0018] In some embodiments, a protrusion is provided on the portion of the fifth surface parallel to the third surface.

[0019] In some embodiments, the connecting sub-part may be flush with the other parts of the fourth surface on one side, or the portion of the fourth surface located on the connecting sub-part may have a first groove.

[0020] In some embodiments, in the thickness direction of the pole post, the bottom of the first groove is located on the side of the first surface away from the third surface.

[0021] In some embodiments, the depth dimension D2 of the first groove is 1mm to 5mm; and / or

[0022] The width W4 of the opening of the first groove in the first preset direction is 4mm to 25mm, and the width W5 of the bottom of the first groove in the first preset direction is 2mm to 20mm, and W5 < W4.

[0023] In some embodiments, the connecting sub-part has a bottom wall and an annular side wall, one end of the annular side wall is connected to the second region, the bottom wall is connected to the other end of the annular side wall, and the annular side wall and the bottom wall together enclose the first groove;

[0024] In the direction from the second region to the bottom wall, the outer contour dimension of the annular sidewall gradually decreases or decreases in a stepwise manner.

[0025] In some embodiments, the angle between the inner surface of the annular sidewall and a dummy axis is α, the dummy axis is parallel to the thickness direction of the pole post, and the angle between the outer surface of the annular sidewall and the dummy axis is β; α is 5° to 60° and / or β is 5° to 60°.

[0026] In some of these embodiments, α = β.

[0027] In some embodiments, the thickness of the annular sidewall is T14, the thickness of the bottom wall is T12, the thickness of the second region is T11, and T12 ≥ T11 > T14.

[0028] In some embodiments, T12 and T11 satisfy: T12-T11=0~2 / 3×T11.

[0029] In some embodiments, the second region includes a first straight section, a first arc section, a second straight section, and a second arc section connected end to end in sequence. The first straight section and the second straight section are respectively located on both sides of the first region in the first preset direction, and the first arc section and the second arc section are respectively located on both sides of the first region in the second preset direction. The first preset direction, the second preset direction, and the thickness direction of the pole are perpendicular to each other.

[0030] In some embodiments, the radius of curvature R of the outer edge of the first arc portion and the outer edge of the second arc portion is 3mm to 8mm.

[0031] In some embodiments, the first connecting portion has a boss and an annular surface on the side opposite to the first surface; the annular surface is arranged around the boss, and the boss protrudes relative to the annular surface in a direction away from the first surface.

[0032] In some embodiments, the protrusion height H1 of the boss relative to the annular surface is 0.05 mm to 0.8 mm.

[0033] In some embodiments, a second groove is formed on the first surface of the first connection portion, and at least a portion of the second groove gradually narrows or tapers in a stepwise manner in the direction from the bottom of the groove to the opening of the groove.

[0034] In some embodiments, the depth dimension of the second groove is H2, and the thickness dimension of the first connecting part is T9, wherein H2 and T9 satisfy: H2 = (5% ~ 50%)T9.

[0035] In some embodiments, the pole post further includes a transition portion, and each second connection portion is connected to the corresponding first connection portion through the transition portion;

[0036] The end of the transition portion connected to the second connecting portion is the first end, and the first end protrudes at least partially from the side of the first connecting portion having the first surface along the thickness direction of the pole post.

[0037] In some embodiments, the minimum flow area of ​​the transition portion is smaller than the minimum flow area of ​​the first connection portion and smaller than the minimum flow area of ​​the second connection portion.

[0038] In some embodiments, the thickness of the first connecting portion is T9, the thickness of the transition portion is T13, the thickness of the second region is T11, and T9 ≥ T11 > T13.

[0039] In some embodiments, the fourth surface has a first groove at the portion of the connecting sub-part; the connecting sub-part has a bottom wall and an annular sidewall, one end of the annular sidewall is connected to the second region, the bottom wall is connected to the other end of the annular sidewall, and the annular sidewall and the bottom wall together enclose the first groove;

[0040] The thickness of the annular sidewall is T14, the thickness of the bottom wall is T12, and T9≥T12≥T11>T13>T14.

[0041] In some embodiments, the pole post includes a first metal layer and a second metal layer, the first metal layer extending to the first connection portion and each of the second connection portions; at each of the second connection portions, the second metal layer and the first metal layer are stacked together along the thickness direction of the pole post, and the side surface of the first metal layer facing away from the second metal layer includes the fourth surface, and the side surface of the second metal layer facing away from the first metal layer includes the second surface.

[0042] In some embodiments, the transition portion has a seventh surface, which is located on the same side of the pole in the thickness direction as the second surface, and the seventh surface and the second surface are transitioned by an arc segment.

[0043] The second metal layer has a first interface at one end near the first connection portion, and there is a preset distance L between the first interface and the arc segment.

[0044] In some embodiments, the preset distance L satisfies: 0.5mm ≤ L ≤ 6mm.

[0045] In some embodiments, the fourth surface has a first groove at the portion of the connecting sub-part; the connecting sub-part has a bottom wall and an annular sidewall, one end of the annular sidewall is connected to the second region, the bottom wall is connected to the other end of the annular sidewall, and the annular sidewall and the bottom wall together enclose the first groove;

[0046] The thickness of the second metal layer at the annular sidewall is T7, the thickness of the second metal layer at the second region is T3, and the thickness of the second metal layer at the bottom wall is T5. T7, T5, and T3 satisfy: T5 ≥ T3 > T7.

[0047] In some embodiments, the thickness T5 of the second metal layer at the bottom wall is 0.3 mm to 1.8 mm; and / or, the thickness T5 of the second metal layer at the bottom wall accounts for 10% to 40% of the thickness of the bottom wall.

[0048] In some embodiments, the thickness T3 of the second metal layer in the second region is 0.05 mm to 1.5 mm; and / or, the thickness T3 of the second metal layer in the second region accounts for 10% to 40% of the thickness of the second region.

[0049] In some embodiments, a second interface is formed between the first metal layer and the second metal layer in the second region;

[0050] In the thickness direction of the pole post, the second interface protrudes from the first surface of the first connection portion.

[0051] In some embodiments, the second metal layer extends to each of the transition portions and the first connecting portion.

[0052] In some embodiments, the thickness of the second metal layer at the second region is T3, the thickness of the second metal layer at the transition portion is T8, and the thickness of the second metal layer at the first connection portion is T2; T3, T8, and T2 satisfy: T8 < T3 ≤ T2.

[0053] In some embodiments, the fourth surface has a first groove at the portion of the connecting sub-part; the connecting sub-part has a bottom wall and an annular sidewall, one end of the annular sidewall is connected to the second region, the bottom wall is connected to the other end of the annular sidewall, and the annular sidewall and the bottom wall together enclose the first groove;

[0054] The thickness of the second metal layer at the bottom wall is T5, and the thickness of the second metal layer at the annular sidewall is T7, where T7 < T8 < T3 ≤ T5 ≤ T2.

[0055] In some embodiments, T5, T3, and T2 satisfy: T5-T3 = 0 to 0.5 × T2.

[0056] In some embodiments, the first metal layer is an aluminum layer and the second metal layer is a copper layer.

[0057] On the other hand, this application provides a top cover assembly, including a cover plate and a pole as described in any of the above embodiments;

[0058] The cover plate has a first through hole, the first connecting part is disposed on one side of the cover plate, the first surface of the first connecting part faces the cover plate, and the second connecting part passes through the first through hole to the other side of the cover plate.

[0059] On the other hand, this application provides a battery cell, characterized in that it includes a housing, a cell assembly, and a top cover assembly as described in any of the above embodiments;

[0060] The housing has an opening at at least one end, the battery cell assembly is housed within the housing, the top cover assembly covers the opening, and the thickness direction of the housing is consistent with the first preset direction; the battery cell assembly includes at least two sets of battery cells arranged side by side along the thickness direction of the housing, and at least two sets of battery cells are configured to correspond one-to-one with at least two second connecting portions, the end face of each set of battery cells extends out of a tab, and the tab of each set of battery cells is respectively connected to the corresponding second connecting portion.

[0061] On the other hand, this application provides a battery including a plurality of battery cells as described in any of the above embodiments, wherein the plurality of battery cells are electrically connected by an electrical connector, and the electrical connector is connected to the first connection portion.

[0062] On the other hand, this application provides an electrical device, characterized in that it includes a battery cell as described in any of the above embodiments, or includes a battery as described in any of the above embodiments.

[0063] Compared with the prior art, this application has the following beneficial effects:

[0064] In the aforementioned terminal posts, top cover assembly, battery cells, batteries, and electrical devices, the terminal posts are directly connected to the tabs of the two sets of battery cells through two second connecting parts. On the one hand, this avoids the use of adapter plates, thereby reducing the number of parts in the top cover assembly and eliminating one welding process. On the other hand, by arranging the two second connecting parts along the arrangement direction of the two sets of battery cells, the two second connecting parts pass through the first through hole on the cover plate and are connected to the tabs of the two sets of battery cells respectively, avoiding the need to extend the tabs and thus greatly reducing the risk of adverse phenomena such as tabs being inserted backward into the battery cells and tabs being torn. Attached Figure Description

[0065] Figure 1 This is a cross-sectional view of a single battery cell in one embodiment of this application;

[0066] Figure 2 This is a schematic diagram of the top cover assembly in one embodiment of this application;

[0067] Figure 3 for Figure 2 A top view of the top cover assembly shown;

[0068] Figure 4 for Figure 2 A schematic diagram of the pole structure of the top cover assembly shown;

[0069] Figure 5 for Figure 4 A top view of the pole shown;

[0070] Figure 6 for Figure 5 The top cover assembly shown is a bottom view.

[0071] Figure 7 for Figure 2 A cross-sectional view of the top cover assembly at the pole (the cross-section is perpendicular to the length direction of the cover plate);

[0072] Figure 8 for Figure 7 The diagram shows a cross-sectional view of the pole of the top cover assembly (the cross-section is perpendicular to the length direction of the cover plate);

[0073] Figure 9 This is a cross-sectional view of the top cover assembly in another embodiment of this application (the cross-section is perpendicular to the length direction of the cover plate);

[0074] Figure 10 for Figure 9 The diagram shows a cross-sectional view of the pole of the top cover assembly (the cross-section is perpendicular to the length direction of the cover plate);

[0075] Figure 11 This is a cross-sectional view of the top cover assembly in another embodiment of this application (the cross-section is perpendicular to the length direction of the cover plate);

[0076] Figure 12 This is a cross-sectional view of the top cover assembly in another embodiment of this application (the cross-section is perpendicular to the length direction of the cover plate);

[0077] Figure 13 This is a step-by-step diagram (isometric view) illustrating the processing method of the pole post in one embodiment of this application;

[0078] Figure 14 To demonstrate using the cross-sectional view of the pole Figure 13 The diagram shows the steps of the processing method.

[0079] Figure 15 This is a step-by-step diagram (sectional view) illustrating the processing method of the pole post in another embodiment of this application. Detailed Implementation

[0080] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0081] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] In this application, unless otherwise expressly 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.

[0085] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0086] One embodiment of this application provides an electrical device, a battery, and a battery cell. The electrical device utilizes the following batteries or battery cells as its power source: vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators, and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc.

[0087] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. For new energy vehicles, the aforementioned battery can serve as a driving power source, thereby replacing fossil fuels to provide propulsion. This application does not impose any special restrictions on the aforementioned electrical devices.

[0088] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then these battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0089] Multiple battery cells can be mounted on supporting structures such as housings, frames, and brackets. Electrical connections between battery cells and between battery cells and the battery management system can be established via electrical connectors, which can be busbars. Alternatively, battery cells can be electrically connected via their respective terminals. For example, between two adjacent battery cells, one battery cell has a slot on its terminal, and the other battery cell has a corresponding insert on its terminal. The insert is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the terminal of another battery cell. Similarly, battery cells and the battery management system can also be electrically connected via mutual insertion, which will not be elaborated further. The aforementioned battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries, and their external contours can be cylindrical, flat, cuboid, or other shapes, but are not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0090] Please see Figure 1 Specifically, the battery cell 1 includes a top cover assembly 100, a housing 200, and a cell assembly 300. The housing 200 is a hollow structure with internal space for accommodating the cell assembly 300, electrolyte, and other components. At least one end of the housing 200 has an opening through which the cell assembly 300 can be installed. Since the battery cell 1 in this embodiment is a prismatic battery, the outer contour of the housing 200 is cuboid, and its opening is rectangular. The top cover assembly 100 is mounted on the housing 200 and covers the opening of the housing 200, thereby enclosing the cell assembly 300 within the housing 200. Because the shape of the top cover assembly 100 needs to match the shape of the opening of the housing 200, the top cover assembly 100 is generally rectangular.

[0091] The cell assembly 300 is the core component of the battery cell 1. To adapt to the shape of the casing 200, the cell assembly 300 in this embodiment is rectangular. The cell assembly 300 generally includes at least two sets of cells 301 arranged side-by-side along the thickness direction of the casing 200, each set of cells 301 extending out with tabs 302. Each set of cells 301 may contain one or more cells 301. The cells 301 can be formed by winding or stacking positive electrode plates, negative electrode plates, and a separator that acts as an insulator between the negative and positive electrode plates. The wound cells 301 can be pressed into a flat shape. The tabs 302 of each cell 301 are divided into a positive tab (not shown) and a negative tab (not shown), which extend from the positive and negative electrode plates, respectively.

[0092] In this embodiment, the positive and negative tabs can be located at the same end of the battery cell 301, or the positive tab can be located at one end of the battery cell 301 and the negative tab at the opposite end of the battery cell 301. Specifically, in this embodiment, the battery cell assembly 300 includes two sets of battery cells 301, each set of battery cells 301 including one battery cell 301. The positive and negative tabs of each battery cell 301 are located at the same end of the battery cell 301 and are spaced apart along the length direction of the battery cell assembly 300, that is, the length direction of the housing 200. Therefore, one end of the battery cell assembly 300 has a total of four sets of tabs 302, of which two sets are negative tabs spaced apart along the width direction of the housing 200, and the other two sets are positive tabs spaced apart along the width direction of the housing 200, while the two sets of negative tabs and the two sets of positive tabs are spaced apart along the length direction of the housing 200. When each group of cells 301 includes multiple cells 301, the positive tabs of the multiple cells 301 are brought together to form a group of positive tabs, and the negative tabs are brought together to form a group of negative tabs. The width direction of the aforementioned housing 200 is also its thickness direction, and the width direction of the cell assembly 300 is also its thickness direction.

[0093] Before the battery cell assembly 300 is installed into the housing 200, it needs to be assembled with the top cover assembly 100. Specifically, the tabs 302 of the battery cell assembly 300 need to be electrically connected to the terminals 30 on the top cover assembly 100 (see...). Figure 2 Then, the battery cell assembly 300 is installed into the housing 200, so that the operation is not limited by the small space inside the housing 200.

[0094] In one embodiment, the battery cell assembly 300 includes two sets of battery cells 301, each set of battery cells 301 including one battery cell 301. That is, the battery cell assembly 300 includes a total of two battery cells 301, and the two battery cells 301 are arranged side by side along the thickness direction of the housing 200.

[0095] The specific structure of the top cover assembly will be described in detail below with reference to the accompanying drawings.

[0096] Please see Figures 1 to 4 As shown in the embodiment of this application, the top cover assembly 100 includes a cover plate 10 and a pole post 30. The cover plate 10 covers the opening of the housing 200 to seal the opening of the housing 200. The cover plate 10 can be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. Specifically, in this embodiment, the cover plate 10 is generally rectangular, matching the shape of the opening of the housing 200. A first through hole 11 is provided on the cover plate 10, and the pole post 30 is mounted on the cover plate 10 through the first through hole 11.

[0097] The terminal post 30 is disposed on the cover plate 10, and the thickness direction Z of the terminal post 30 is consistent with the thickness direction of the cover plate 10. Since the positive and negative terminals of the cell assembly 300 are located at the same end, the cover plate 10 is provided with mutually spaced positive and negative terminals along its length. The positive terminal post is used to connect to the positive terminal of each group of cells 301, and the negative terminal post is used to connect to the negative terminal of each group of cells 301. Of course, if the positive and negative terminals are located at opposite ends of the cell assembly 300, only one of the positive and negative terminals needs to be provided on the cover plate 10. The positive terminal post serves as the positive terminal of the battery cell 1, and the negative terminal post serves as the negative terminal of the battery cell 1. The positive and negative terminals of each battery cell 1 are connected using electrical connectors to realize series, parallel, or mixed connection of the battery cells 1. The electrical connectors can be busbars or terminals 30 of other battery cells 1. The connection method between the electrical connector and the pole 30 can be welding, plugging, riveting, snap-fitting, bonding or other methods. Among them, plugging means that one of the electrical connector and the pole 30 is provided with a slot and the other is provided with a plug. The plug is inserted into the slot to achieve electrical connection. In addition, to improve the electrical connection effect, a spring contact finger can be provided between the plug and the slot wall to increase the contact area between the two.

[0098] It should be noted that, due to the similarity in structure between the positive and negative terminals, this article will use one of the terminals, 30, as an example for ease of understanding. That is to say, the term "terminal" in this article can be either a positive or negative terminal (unless explicitly stated otherwise), and the term "tab" can be either a positive or negative tab (unless explicitly stated otherwise), as long as all tabs connected to the positive terminal are positive tabs and all tabs connected to the negative terminal are negative tabs.

[0099] Specifically, the electrode post 30 includes a first connecting portion 31 and two second connecting portions 32. The two second connecting portions 32 are arranged at intervals along a first preset direction X. A first connecting portion 31 is provided between the two second connecting portions 32, and the first connecting portion 31 is connected to the two adjacent second connecting portions 32. The first connecting portion 31 is located on the side of the cover plate 10 away from the cell assembly 300 (i.e., the outer side of the cover plate 10) and is used to connect with the electrical connector. The aforementioned first preset direction X is consistent with the thickness direction of the housing 200, that is, the arrangement direction of the two second connecting portions 32 is consistent with the arrangement direction of the two sets of cells 301, so that the two second connecting portions 32 correspond one-to-one with the tabs 302 of the two sets of cells 301. At least a portion of each second connecting portion 32 passes through the first through hole 11 on the cover plate 10 and is connected to the corresponding tab 302, thereby realizing the direct connection between the electrode post 30 and each tab 302.

[0100] In the aforementioned top cover assembly 100, the pole post 30 is directly connected to the tabs 302 of the two sets of battery cells 301 via two second connecting parts 32. This avoids the use of adapter plates, thereby reducing the number of parts in the top cover assembly 100 and eliminating one welding process. Furthermore, by arranging the two second connecting parts 32 along the arrangement direction of the two sets of battery cells 301, the two second connecting parts 32 pass through the first through hole 11 on the cover plate 10 and are respectively connected to the tabs 302 of the two sets of battery cells 301. This avoids the need to extend the tabs 302, thereby greatly reducing the risk of adverse phenomena such as the tabs 302 being inserted backwards into the battery cells 301 and the tabs 302 being torn.

[0101] It should be noted that, in order to enable the electrode post 30 to be directly connected to the electrode tab 302, the prior art still uses the method of directly increasing the diameter of the electrode post 30. However, in this application, by arranging the two second connecting parts 32 along the arrangement direction of the two sets of cells 301, the two second connecting parts 32 can pass through the first through hole 11 on the cover plate 10 and be directly electrically connected to their respective electrode tabs 302, thus avoiding the need to increase the diameter of the electrode post 30, which helps to save electrode post 30 material and reduce electrode post 30 cost.

[0102] It should also be noted that the number of first connecting parts 31 is not limited to one; it can be two or more. Similarly, the number of second connecting parts 32 is not limited to two; it can be three or more. The number of first connecting parts 31 and second connecting parts 32 is related to the number of groups of battery cells 301. Specifically, if there are N groups of battery cells 301, the number of second connecting parts 32 is also set to N. These N second connecting parts 32 are arranged at intervals along a first preset direction X. A first connecting part 31 is provided between every two adjacent second connecting parts 32, and each pair of adjacent second connecting parts 32 is connected to the first connecting part 31 between them; that is, there are N-1 first connecting parts 31. The N second connecting parts 32 respectively pass through the first through holes 11 on the cover plate 10 and are connected one-to-one with the tabs 302 of each group of battery cells 301. It should be noted that the number of groups of battery cells 301 is not the same as the quantity of battery cells 301. For example, a battery cell assembly 300 may include four battery cells 301. Two battery cells 301 form one group, with their tabs 302 joined together to form a single tab 302, which is connected to a second connection part 32. The other two battery cells 301 form another group, with their tabs 302 joined together to form a single tab 302, which is connected to another second connection part 32. In this case, there are two groups of battery cells 301, but the quantity of battery cells 301 is four; the two are not the same. For ease of understanding, this article will use the example of a battery cell assembly 300 including two groups of battery cells 301, each group including one battery cell 301, and a terminal 30 including a first connection part 31 and two second connection parts 32.

[0103] Specifically, in this embodiment, the first through hole 11 on the cover plate 10 can be a single through hole with a relatively large opening range, allowing at least two second connecting parts 32 to pass through together; the first through hole 11 can also be a through hole with a relatively small opening range, allowing only one second connecting part 32 to pass through each first through hole 11. Please refer to... Figure 3 A first through hole 11 is provided on the cover plate 10 at the position corresponding to the two second connecting parts 32, so that the two second connecting parts 32 are respectively inserted through the first through hole 11 corresponding to them, and then connected to the two tabs 302 on the inner side of the cover plate 10 respectively.

[0104] As can be seen, the first through hole 11 is a through hole with a small opening range, and the area of ​​the cover plate 10 corresponding to the first connecting part 31 does not need to be opened. Therefore, the opening area on the cover plate 10 can be reduced, thereby avoiding a significant decrease in the structural strength of the cover plate 10 due to the opening.

[0105] by Figure 3As shown in the example, the cover plate 10 has four first through holes 11. Two of the first through holes 11 are located at one end of the length direction of the cover plate 10 and are spaced apart along the width direction of the cover plate 10. The other two first through holes 11 are located at the other end of the length direction of the cover plate 10 and are also spaced apart along the width direction of the cover plate 10.

[0106] Specifically, in the embodiment, on a dummy plane perpendicular to the thickness direction of the pole post 30, the orthographic projection of the first connecting portion 31 does not overlap with the orthographic projection of each of the second connecting portions 32. That is, each of the second connecting portions 32 and the first connecting portion 31 are completely staggered in the thickness direction Z of the pole post 30, so that the welding position of the first connecting portion 31 to the electrical connector is far enough away from each of the second connecting portions 32. Therefore, when the electrical connector is welded to the first connecting portion 31, the adverse effects of the heat generated by welding on the first insulating component 20 (see 7) and the sealing ring 40 (see 7) are greatly reduced, which helps to reduce the risk of cracking or heat melting of the first insulating component 20 and improve the sealing reliability of the sealing ring 40.

[0107] Specifically, in this embodiment, the distance W2 between the ends of the two second connecting portions 32 of the pole post 30 that are far apart from each other (i.e., the length dimension W2 of the pole post 30 in the first preset direction X) is 20mm to 70mm. Thus, since the width dimension of the cover plate 10 (i.e., the dimension of the cover plate 10 in the first preset direction X) is limited, by setting W2 between 20mm and 70mm, on the one hand, it ensures that the two second connecting portions 32 are as close as possible to the two sides of the cover plate 10 in the first preset direction X. Since the tabs 302 of the two sets of cells 301 are respectively located close to the two sides of the cover plate 10 in the width direction, the two second connecting portions 32 are as close as possible to their respective tabs 302, thereby reducing the required length of the tabs 302 and avoiding the need to extend the length of the tabs 302. On the other hand, the moderate length of the pole post 30 ensures that the electrical connection area between the second connecting portion 32 and the tab 302, and the electrical connection area between the first connecting portion 31 and the electrical connector are sufficiently large to better meet the overcurrent requirements, while also saving materials and reducing costs.

[0108] Specifically, in this embodiment, W2 can also be located in multiple ranges such as 20mm-30mm, 20mm-40mm, 20mm-50mm, 20mm-60mm, 60mm-70mm, 50mm-70mm, 40mm-70mm, 30mm-70mm, 20mm-40mm, 40mm-60mm, and 30mm-50mm, which can be selected according to the actual situation. For example, W2 can be 20mm, 22mm, 24mm, 25mm, 26mm, 28mm, 30mm, 33mm, 35mm, 37mm, 39mm, 40mm, 42mm, 44mm, 45mm, 46mm, 48mm, 50mm, 53mm, 55mm, 57mm, 59mm, 60mm, 62mm, 64mm, 66mm, 65mm, 68mm, or 70mm, etc., including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0109] In some other embodiments, the distance W2 between the ends of the two second connecting portions 32 that are far apart from each other is (W1-30mm) to (W1-10mm), where W1 represents the width dimension of the cover plate 10 (i.e. the dimension of the cover plate 10 in the first preset direction X). Thus, since the width of the cover plate 10, the arrangement direction of the two sets of battery cells 301, and the arrangement direction of the two second connecting parts 32 are consistent, the spacing value W2 is designed according to the width of the cover plate 10. On the one hand, the two second connecting parts 32 can be as close as possible to the two sides of the cover plate 10 in the first preset direction X. Since the tabs 302 of the two sets of battery cells 301 are located close to the two sides of the cover plate 10 in the width direction, the two second connecting parts 32 are as close as possible to their respective tabs 302, thereby ensuring that the required tab length is small and avoiding the need to extend the tab length. On the other hand, the length of the pole post 30 is moderate, which can ensure that the electrical connection area between the second connecting part 32 and the tab 302, and the electrical connection area between the first connecting part 31 and the electrical connector are large enough to better meet the overcurrent requirements, and can also save materials and reduce costs.

[0110] Specifically, W2 can be within multiple ranges such as (W1-25mm)~(W1-10mm), (W1-20mm)~(W1-10mm), (W1-15mm)~(W1-10mm), (W1-30mm)~(W1-15mm), (W1-30mm)~(W1-20mm), (W1-30mm)~(W1-25mm), and (W1-25mm)~(W1-15mm). For example, W2 can be (W1-30mm), (W1-28mm), (W1-26mm), (W1-24mm), (W1-22mm), (W1-20mm), (W1-19mm), (W1-17mm), (W1-15mm), (W1-13mm), or (W1-10mm), etc., including but not limited to the values ​​listed. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0111] Specifically, in this embodiment, the dimension W3 of each second connection part 32 in the first preset direction X satisfies: 3mm≤W3≤1 / 2×W2, thereby ensuring that the electrical connection area between the second connection part 32 and the tab 302 is large enough to meet the overcurrent requirements, while also saving materials and reducing costs.

[0112] Specifically, in this embodiment, the two second connecting portions 32 are symmetrically arranged on both sides of the first connecting portion 31. Please refer to [link / reference]. Figure 7 The distance J from the central axis of the second connecting part 32 to the edge of the cover plate 10 is 4mm to 17mm. The distance K between the central axis of the first connecting part 31 and the central axis of the second connecting part 32 is 0.5mm to 2mm. By setting J and K within a reasonable range, on the one hand, the required length of the tab 302 is kept small, avoiding the need to extend the length of the tab 302; on the other hand, the length of the pole post 30 is moderate, ensuring that the electrical connection area between the second connecting part 32 and the tab 302, and the electrical connection area between the first connecting part 31 and the electrical connector, are sufficiently large to better meet the overcurrent requirements, while also saving materials and reducing costs.

[0113] Specifically, J can be within multiple ranges such as 4mm~7mm, 4mm~10mm, 4mm~13mm, 4mm~15mm, 13mm~17mm, 10mm~17mm, 7mm~17mm, 8mm~13mm, 8mm~10mm, 10mm~13mm, and 9mm~12mm, and the specific range can be selected according to the actual situation. For example, J can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.3mm, 9.5mm, 9.7mm, 9.9mm, 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.3mm, 11.5mm, 11.7mm, 11.9mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 16.5mm, or 17mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0114] Specifically, K can be within multiple ranges, such as 0.5mm~0.8mm, 0.5mm~1.1mm, 0.5mm~1.3mm, 0.5mm~1.7mm, 1.7mm~2mm, 1.5mm~2mm, 1.1mm~2mm, 0.9mm~2mm, 0.7mm~1.5mm, 0.7mm~1mm, 0.7mm~1.3mm, 1.2mm~1.5mm, and 0.9mm~1.3mm, which can be selected according to the actual situation. For example, K can be 0.5mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.7mm, 1.9mm, or 2mm, including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0115] Specifically, in this embodiment, the dimension W6 of each second connecting portion 32 in the second preset direction Y is 20mm to 60mm. The first preset direction X, the second preset direction Y, and the thickness direction Z of the electrode post 30 are all perpendicular to each other. That is, the first preset direction X is the width direction of the cover plate 10, the second preset direction Y is the length direction of the cover plate 10, and the thickness direction Z of the electrode post 30 is consistent with the thickness direction of the cover plate 10. Thus, by setting W6 between 20mm and 60mm, the connection area between the second connecting portion 32 and the corresponding electrode tab 302 is sufficiently large, saving material and reducing costs as much as possible while meeting the overcurrent requirements.

[0116] Specifically, in this embodiment, W6 can also be located in multiple ranges such as 20mm-30mm, 20mm-40mm, 20mm-50mm, 50mm-60mm, 40mm-60mm, 30mm-60mm, 25mm-35mm, 35mm-45mm, 30mm-50mm, and 45mm-55mm, which can be selected according to the actual situation. For example, W6 can be 20mm, 22mm, 24mm, 25mm, 26mm, 28mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 53mm, 55mm, 57mm, 59mm, or 60mm, etc., including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0117] Specifically, in this embodiment, the dimension W7 of the first connecting portion 31 in the second preset direction Y is smaller than W6. Wherein, W7 = (40%~90%)W6. If the dimension W7 is too small, the connection area between the first connecting portion 31 and the electrical connector is too small, which is not conducive to current flow; if the dimension W7 is too large, the original sheet material required to form the electrode post 30 is too large, increasing the weight of the electrode post 30 and wasting material. Therefore, limiting the ratio of W7 to W6 within a suitable range ensures that the connection area between the first connecting portion 31 and the electrical connector is large enough, thereby minimizing the weight of the electrode post 30, saving material, and reducing costs while meeting current flow requirements.

[0118] Specifically, W7 can be within multiple ranges such as (50%–90%)W6, (60%–90%)W6, (70%–90%)W6, (80%–90%)W6, (70%–90%)W6, (60%–90%)W6, (50%–60%)W6, (60%–70%)W6, (70%–80%)W6, and (55%–75%)W6. The specific range can be selected according to the actual situation. For example, W7 can be 50%W6, 52%W6, 54%W6, 56%W6, 58%W6, 60%W6, 63%W6, 65%W6, 67%W6, 69%W6, 70%W6, 72%W6, 74%W6, 76%W6, 77%W6, 78%W6, 79%W6, 80%W6, 81%W6, 82%W6, 83%W6, 84%W6, 85%W6, 86%W6, 87%W6, 88%W6, 89%W6, or 90%W6, etc., including but not limited to the values ​​listed. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0119] Of course, in other embodiments, the dimension W7 of the first connecting portion 31 in the second preset direction Y can also be set to be equal to the dimension W6 of the second connecting portion 32 in the second preset direction Y, which is not limited here.

[0120] Please see Figures 4 to 8 In the embodiments of this application, the first connecting portion 31 has a first surface b1 on one side facing the cover plate 10. Two second connecting portions 32 protrude from the first surface b1 of the first connecting portion 31 along the thickness direction of the electrode post 30, such that the two second connecting portions 32 protrude relative to the first connecting portion 31 towards the cover plate 10. This allows the two second connecting portions 32 to penetrate through the first through hole 11 on the cover plate 10 to the side of the cover plate 10 facing the cell assembly 300 (i.e., the inner side of the cover plate 10), and then connect one-to-one with the tabs 302 of the two sets of cells 301. In other words, the tabs 302 of the two sets of cells 301 are connected one-to-one with the two second connecting portions 32, and the two second connecting portions 32 are electrically connected to the first connecting portion 31, making the first connecting portion 31 an electrode terminal of the battery cell.

[0121] Furthermore, the first connecting portion 31 also has a third surface b3 opposite to the first surface b1, and each second connecting portion 32 has a second surface b2 and a fourth surface b4 on both sides of the pole post 30 in the thickness direction Z. The second surface b2 and the first surface b1 are located on the same side of the pole post 30 in the thickness direction Z, and the third surface b3 and the fourth surface b4 are both located on the other side of the pole post 30 in the thickness direction Z. The second surface b2 protrudes from the first surface b1 of the first connecting portion 31 in the thickness direction Z (i.e., the second surface b2 is located on the side of the first surface b1 away from the third surface b3), and the third surface b3 protrudes from the fourth surface b4 of the second connecting portion 32 in the thickness direction of the pole post 30 (i.e., the third surface b3 is located on the side of the fourth surface b4 away from the second surface b2). In other words, on the side of the pole post 30 away from the cover plate 10, the first connecting portion 31 protrudes from each of the second connecting portions 32; on the side of the pole post 30 facing the cover plate 10, each of the second connecting portions 32 protrudes from the first connecting portion 31, so that the pole post 30 forms a structure in which each of the second connecting portions 32 is recessed relative to the first connecting portion 31 towards the cover plate 10. This allows the pole post 30 to be manufactured using a stamping process, that is, stamping processes such as upsetting and deep drawing are used to stamp the sheet metal, thereby forming the first connecting portion 31 and each of the second connecting portions 32 recessed relative to the first connecting portion 31 on the sheet metal. Compared with the cutting process that removes material in the prior art, this greatly reduces the process cost and material cost.

[0122] In this embodiment, the first connecting portion 31 and each of the second connecting portions 32 of the pole post 30 are integrally formed, for example, by stamping. That is, the first connecting portion 31 and each of the second connecting portions 32 of the pole post 30 are integrally formed by stamping. Thus, compared with the cutting process used in the prior art that removes material, using a stamping process to form the pole post 30 is more adaptable to mass production, improving production efficiency and processing costs; on the other hand, it greatly reduces material waste in the pole post 30, lowering its material cost. It should be noted that in other embodiments, other integral forming processes can also be used, such as die casting or 3D printing, etc., and are not specifically limited here.

[0123] In the embodiments of this application, during the stamping process of forming the pole post 30, the corresponding area of ​​forming the second connecting portion 32 on the sheet metal includes a first region 321 and a second region 322 surrounding the first region 321. The second region 322 of the second connecting portion 32 is connected to the first connecting portion 31. The first region 321 of the second connecting portion 32 is drawn once or multiple times using a deep drawing process, so that the first region 321 of the second connecting portion 32 protrudes relative to the second region 322 along the thickness direction Z of the pole post 30 towards the side away from the third surface b3 to form a connecting sub-portion 324. The portion of the second surface b2 located in the connecting sub-portion 324 is the fifth surface b5, and part of this fifth surface b5 is a plane parallel to the third surface b3. That is, the third surface b3, which is welded to the electrical connector, and the portion of the fifth surface b5, which is welded to the electrode tab, are parallel to each other, which helps to reduce the difficulty of the welding operation.

[0124] Specifically, in this embodiment, the second region 322 has a sixth surface b6 that is opposite to the fourth surface b4. It can be understood that the sixth surface b6 is a part of the second surface b2. That is, the side of the second region 322 facing away from the cover plate 10 is the fourth surface b4, and the side of the second region 322 facing the cover plate 10 is the sixth surface b6. The distance between the fourth surface b4 and the sixth surface b6 is the thickness of the second region 322. The side of the connecting portion 324 facing the cell assembly 300 is the portion of the fifth surface b5 parallel to the third surface b3. The electrode 302 is welded and fixed to the portion of the fifth surface b5 parallel to the third surface b3. Thus, the first region 321 of the second connecting portion 32 can be stretched once or multiple times using a stamping process, causing the first region 321 to protrude relative to the second region 322 towards the cover plate 10 to form the connecting portion 324. This connecting portion 324 passes through the first through hole 11 on the cover plate 10 and is then welded and fixed to the corresponding electrode 302.

[0125] It should be noted that the tab 302 can be welded to the fifth surface b5 of the connector 324 using welding processes, such as laser welding, resistance welding, ultrasonic welding, and pressure welding. Alternatively, conductive adhesive can be used to bond and fix the tab 302 to the fifth surface b5 of the connector 324.

[0126] In this embodiment, the tab 302 is welded and fixed to the fifth surface b5 by pressure welding. Further, a protrusion 34 is provided on the portion of the fifth surface b5 parallel to the third surface b3. During pressure welding, the tab 302 contacts the protrusion 34. Due to the small flow area at the protrusion 34, the heat generated is large, causing the protrusion 34 on the fifth surface b5 to melt and weld the tab 302 to the portion of the fifth surface b5 parallel to the third surface b3.

[0127] In a specific embodiment, the pole post 30 further includes a transition portion 33, and each second connecting portion 32 is connected to the first connecting portion 31 through the transition portion 33. The end of the transition portion 33 connected to the second connecting portion 32 is the first end, which at least partially protrudes from the first surface b1 of the first connecting portion 31 along the thickness direction Z of the pole post 30. That is, the transition portion 33 extends obliquely relative to the thickness direction Z of the pole post 30 from the end connected to the first connecting portion 31 to the end connected to the second connecting portion 32, so that the sixth surface b6 of the second region 322 protrudes from the first surface b1 of the first connecting portion 31 in the thickness direction Z of the pole post 30. That is, the second region 322 of the second connecting portion 32 is lowered relative to the first connecting portion 31 as a whole, thereby making the protrusion of the connecting sub-part 324 relative to the first connecting portion 31 greater, which is beneficial to reduce the drawing depth of the connecting sub-part 324, reduce the drawing difficulty, and improve the drawing quality of the pole post 30.

[0128] Furthermore, the transition section 33 is configured to be the first to melt in the event of thermal runaway of the battery cell 1, meaning that the transition section 33 melts before the first connecting section 31 and the second connecting section 32. Specifically, in this embodiment, the minimum current-carrying area of ​​the transition section 33 is smaller than the minimum current-carrying area of ​​the first connecting section 31 and smaller than the minimum current-carrying area of ​​the second connecting section 32. The minimum current-carrying area refers to the minimum area through which fluid passes. Here, the minimum current-carrying area of ​​the transition section 33 refers to the minimum surface area of ​​the transition section 33 perpendicular to the current flow direction, i.e., the minimum cross-sectional area of ​​the transition section 33. Similarly, the minimum current-carrying areas of the first connecting section 31 and the second connecting section 32 refer to the minimum surface areas of the first connecting section 31 and the second connecting section 32 perpendicular to the current flow direction, i.e., the minimum cross-sectional areas of the first connecting section 31 and the second connecting section 32. Thus, in actual use, when a circuit malfunction occurs, due to the smaller minimum current-carrying area of ​​the transition section 33, the temperature rises faster at the transition section 33, allowing it to melt quickly and thus promptly cut off the circuit, greatly improving battery safety. It is understandable that the transition portion 33 can reduce its current-carrying area by slotting, opening, and / or thinning, ensuring that it can melt and cut off the circuit in time when the circuit is abnormal. The thinning structure can be a general reduction in the thickness of the transition portion 33, or a groove structure formed in a part of the transition portion 33 and locally thinning the transition portion 33.

[0129] Please continue reading Figures 4 to 8 Furthermore, the connecting portion 324 can be formed on one side of the fourth surface b4, flush with the other parts of the fourth surface b4 (not shown), or it can have a first groove 323 formed on one side of the fourth surface b4, making the connecting portion 324 a hollow structure, in order to further save material and reduce weight. It is understood that during the process of drawing the sheet metal one or more times using a mold, the first region 321 of the sheet metal protrudes outward to one side relative to the second region 322, thereby forming the hollow connecting portion 324.

[0130] In this embodiment, the depth D2 of the first groove 323 is 1mm to 5mm. If the depth of the first groove 323 is too shallow, the portion of the fifth surface b5 parallel to the third surface b3 will be far from the cell 301, requiring a longer tab 302; if the depth of the first groove 323 is too deep, the deep drawing process will be more difficult. In this embodiment, by rationally designing the depth of the first groove 323, a moderate depth is achieved, which allows welding of the tab 302 to the fifth surface b5 without lengthening the tab 302, while also reducing the difficulty of the deep drawing process and improving production efficiency and the yield of the electrode post 30.

[0131] Specifically, D2 can be within multiple ranges such as 1mm~3mm, 1mm~4mm, 3mm~5mm, 2mm~5mm, 2mm~4mm, 1mm~2.5mm, and 2.5mm~5mm, and the specific range can be selected according to the actual situation. For example, D2 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0132] In this embodiment, the width W4 of the opening of the first groove 323 in the first preset direction X is 4mm to 25mm, and the width W5 of the bottom of the first groove 323 in the first preset direction X is 2mm to 20mm, with W5 < W4. Thus, designing the first groove 323 with a wide opening and a narrow bottom, and rationally designing the specific values ​​of the opening and bottom widths, facilitates optimization of material flow during deep drawing, improves deep drawing quality, and significantly reduces the risk of wrinkles at corners.

[0133] Specifically, W4 can be within multiple ranges such as 4mm~9mm, 4mm~14mm, 4mm~19mm, 4mm~23mm, 20mm~25mm, 15mm~25mm, 10mm~25mm, 7mm~25mm, 5mm~15mm, 5mm~10mm, 10mm~15mm, 7mm~12mm, and 8mm~18mm, and the specific range can be selected according to the actual situation. For example: W4 can be 4mm, 4.5mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, 8.3mm, 8.5mm, 8. 9mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, 10.3mm, 10.5mm, 10.7mm, 10.9mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.3mm, 12.5mm, 12. 7mm, 12.9mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.3mm, 14.5mm, 14.7mm, 14.9mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, or 25mm, etc., including but not limited to the listed values. Other values ​​within the above ranges still apply and are not specifically limited here.

[0134] Specifically, W5 can be within multiple ranges such as 2mm-7mm, 2mm-13mm, 2mm-18mm, 2mm-13mm, 15mm-20mm, 10mm-20mm, 5mm-20mm, 2mm-11mm, 11mm-20mm, 3mm-8mm, and 7mm-15mm, which can be selected according to the actual situation. For example, W5 can be 2mm, 2.5mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.5mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, 9mm, 9.5mm, 10mm, etc. 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, or 20mm, etc., including but not limited to the listed values. Other values ​​within the above ranges still apply and are not specifically limited here.

[0135] Specifically, in this embodiment, the connecting sub-part 324 has an annular sidewall 3245 and a bottom wall 3247. One end of the annular sidewall 3245 is connected to the second region 322. The bottom wall 3247 is connected to the other end of the annular sidewall 3245, and the portion of the fifth surface b5 parallel to the third surface b3 is located on the bottom wall 3247. The annular sidewall 3245 and the bottom wall 3247 together form the first groove 323. The outer surfaces of the annular sidewall 3245 and the bottom wall 3247 are the fifth surface b5. In the direction from the second region 322 to the bottom wall 3247, the outer contour dimension of the annular sidewall 3245 gradually decreases or decreases in a stepped manner, making the connecting part 324 have a shape that is larger at the top and smaller at the bottom. On the one hand, this is conducive to deep drawing and reduces the processing difficulty; on the other hand, it makes it easy for the connecting part 324 to be inserted into the corresponding first through hole 11 on the cover plate 10 during assembly, reducing the assembly difficulty; and on the other hand, it makes the opening range of the first through hole 11 relatively small, thereby avoiding a significant decrease in the structural strength of the cover plate 10 due to the opening.

[0136] Please see Figure 10In this embodiment, the angle between the inner surface of the annular sidewall 3245 and a dummy axis C is α, which is parallel to the thickness direction of the pole post 30. The angle between the outer surface of the annular sidewall 3245 and the dummy axis C is β. Wherein α = β. α can be 5° to 60° and / or β can be 5° to 60°. Thus, by rationally designing the specific values ​​of angles α and β, the inclination of the annular sidewall 3245 is moderate, which facilitates improved material flow during deep drawing, enhances deep drawing quality, and significantly reduces the risk of wrinkles at corners. In other embodiments, α and β may also be unequal.

[0137] Specifically, α can be within multiple ranges such as 5°~15°, 5°~25°, 5°~35°, 5°~45°, 5°~55°, 50°~60°, 40°~60°, 30°~60°, 20°~60°, 10°~60°, 15°~60°, 20°~50°, 30°~40°, 30°~50°, 50°~60°, and 15°~45°, and can be selected according to the actual situation. For example, α can be 5°, 7°, 9°, 11°, 13°, 15°, 17°, 19°, 20°, 22°, 24°, 26°, 28°, 30°, 33°, 35°, 37°, 39°, 40°, 42°, 44°, 46°, 48°, 50°, 53°, 57°, 59° or 60°, including but not limited to the values ​​listed. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0138] Specifically, β can be within multiple ranges such as 5°~15°, 5°~25°, 5°~35°, 5°~45°, 5°~55°, 50°~60°, 40°~60°, 30°~60°, 20°~60°, 10°~60°, 15°~60°, 20°~50°, 30°~40°, 30°~50°, 50°~60°, and 15°~45°, and can be selected according to the actual situation. For example, α can be 5°, 7°, 9°, 11°, 13°, 15°, 17°, 19°, 20°, 22°, 24°, 26°, 28°, 30°, 33°, 35°, 37°, 39°, 40°, 42°, 44°, 46°, 48°, 50°, 53°, 57°, 59° or 60°, including but not limited to the values ​​listed. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0139] Furthermore, the thickness of the first connecting portion 31 is T9, the thickness of the transition portion 33 is T13, the thickness of the second region 322 is T11, the thickness of the annular sidewall 3245 is T14, and the thickness of the bottom wall 3247 is T12, satisfying: T9≥T12≥T11>T13>T14. Furthermore, T12 and T11 satisfy: T12-T11=0~2 / 3×T11. Thus, by rationally designing the thickness of each part of the pole post 30, the material flow during deep drawing can be further optimized, reducing the difficulty of deep drawing and improving production efficiency and yield.

[0140] Specifically, T12-T11 can be within multiple intervals such as 0~1 / 6×T11, 0~1 / 3×T11, 0~1 / 2×T11, 1 / 2×T11~2 / 3×T11, 1 / 3×T11~2 / 3×T11, 1 / 6×T11~2 / 3×T11, 1 / 6×T11~1 / 2×T11, 1 / 6×T11~1 / 3×T11, and 1 / 3×T11~1 / 2×T11. The specific interval can be selected according to the actual situation. For example, T12-T11 can be 1 / 12×T11, 1 / 6×T11, 1 / 4×T11, 1 / 3×T11, 5 / 12×T11, 1 / 2×T11, 7 / 12×T11 or 2 / 3×T11, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0141] In this embodiment, the first connecting portion 31 needs to be welded to the electrical connector, and the second connecting portion 32 needs to be welded to the electrode lug via the bottom wall 3247. Therefore, the thickness of the first connecting portion 31 and the bottom wall 3247 is thicker than other parts to provide sufficient penetration depth. The thickness dimension T9 of the first connecting portion 31 is 2 mm to 8 mm, and the thickness dimension T12 of the bottom wall 3247 is greater than or equal to 1.2 mm. Correspondingly, the thickness dimension T14 of the annular sidewall 3245 of each connecting sub-part 324 is greater than or equal to 0.5 mm.

[0142] Specifically, T9 can be in multiple ranges such as 2mm-4mm, 2mm-6mm, 6mm-8mm, 4mm-8mm, 3mm-7mm, 4mm-6mm, 3mm-5mm, and 4mm-7mm, and the specific range can be selected according to the actual situation. For example, T9 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5mm, etc. 0.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, or 8mm, etc., including but not limited to the listed values. Other values ​​within the above ranges still apply and are not specifically limited here.

[0143] Specifically, T12 can be in multiple ranges such as 1.2mm-2mm, 1.2mm-4mm, 2mm-6mm, 6mm-8mm, 4mm-8mm, 2mm-8mm, 3mm-7mm, 4mm-6mm, 3mm-5mm, and 4mm-7mm, and the specific range can be selected according to the actual situation. For example: T9 can be 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm , 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5 The following values ​​are included, but are not limited to: 0.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, or 8mm. Other values ​​within the above ranges are also applicable and are not specifically limited here.

[0144] Specifically, T14 can be in multiple ranges, such as 0.5mm-1.5mm, 0.5mm-2.5mm, 0.5mm-3.5mm, 0.5mm-4.5mm, 0.5mm-6mm, 4.5mm-6mm, 3mm-6mm, 1mm-6mm, 1mm-5mm, 2mm-4mm, 0.5mm-3mm, 3mm-6mm, and 2mm-4mm. The specific range can be selected according to the actual situation. For example: T14 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1 .9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3. 5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, or 6mm, including but not limited to the listed values. Other values ​​within the above ranges still apply and are not specifically limited here.

[0145] It should also be noted that the thickness of the second region 322 located on the side of the connecting sub-part 324 away from the first connecting part 31 may be equal to or unequal to the thickness of the side of the connecting sub-part 324 near the first connecting part 31, and this is not limited here. Similarly, the thickness of the annular sidewall 3245 located on the side of the first groove 323 away from the first connecting part 31 may be opposite to or unequal to the thickness of the side of the first groove 323 near the first connecting part 31, and this is not limited here.

[0146] The positive terminal 30 is typically made of a single piece of aluminum and can be directly contacted and welded to the positive tab of the battery cell assembly. Since the positive terminal and the positive tab of the battery cell assembly are made of the same material, the welding effect between them can be improved.

[0147] Please see Figure 9 and Figure 10As shown, the negative electrode post 30 includes a first metal layer A and a second metal layer B stacked along the thickness direction Z of the post 30. Both the first metal layer A and the second metal layer B extend to the first connecting portion 31, each transition portion 33, and each second connecting portion 32. The surface of the first metal layer A facing away from the second metal layer B includes the aforementioned third surface b3 and fourth surface b4, and the surface of the second metal layer B facing away from the first metal layer A includes the aforementioned first surface b1 and second surface b2. That is, the second metal layer B is located on the side of the first metal layer A facing the cell assembly 300, such that the second surface b2 is the second metal layer B. Since the fifth surface b5 is part of the second surface b2, the fifth surface b5 is also the second metal layer B, meaning the electrode tab 302 is welded to the second metal layer B at the fifth surface b5; the third surface b3 of the first connecting portion 31 is the first metal layer A, meaning the electrical connector is welded to the first metal layer A at the third surface b3.

[0148] Thus, by using a composite plate to prepare the electrode post 30, it is ensured that the tab 302 is welded to the second metal layer B at the connecting part 324. This second metal layer B can be made of the same material as the corresponding tab 302, or a material that is easily welded to the corresponding tab 302, ensuring the welding quality between the tab 302 and the fifth surface b5. Similarly, by using a composite plate to prepare the electrode post 30, it is ensured that the electrical connector is welded to the first metal layer A at the first connecting part 31. This first metal layer A can be made of the same material as the electrical connector, or a material that is easily welded to the electrical connector, ensuring the welding quality between the electrical connector and the third surface b3 of the first connecting part 31. More specifically, in this embodiment, the first metal layer is an aluminum layer, the second metal layer is a copper layer, and the electrode post 30 is made of a copper-aluminum composite plate through a stamping process. Since the negative electrode tab of the battery cell assembly is generally also made of copper, the second metal layer B is made of the same material as the negative electrode tab, which can improve the welding effect between the negative electrode post and the negative electrode tab.

[0149] Specifically, in this embodiment, the thickness of the second metal layer B at the first connecting portion 31 is T2, the thickness of the second metal layer B at the second region 322 is T3, the thickness of the second metal layer B at the bottom wall 3247 is T5, the thickness of the second metal layer B at the annular sidewall 3245 is T7, and the thickness of the second metal layer B at the transition portion 33 is T8. Wherein, T2, T3, T5, T7, and T8 satisfy: T7 < T8 < T3 ≤ T5 ≤ T2. Further, T5, T3, and T2 satisfy: T5 - T3 = 0 ~ 0.5 × T2.

[0150] Specifically, T5-T3 can be within multiple intervals, such as 0~0.1×T2, 0~0.2×T2, 0~0.3×T2, 0~0.4×T2, 0.4×T2~0.5×T2, 0.3×T2~0.5×T2, 0.2×T2~0.5×T2, 0.05×T2~0.45×T2, 0.1×T2~0.4×T2, and 0.15×T2~0.35×T2. The specific interval can be selected according to the actual situation. For example, T5-T3 can be 0.1×T2, 0.12×T2, 0.14×T2, 0.16×T2, 0.18×T2, 0.2×T2, 0.23×T2, 0.25×T2, 0.27×T2, 0.29×T2, 0.3×T2, 0.32×T2, 0.34×T2, 0.36×T2, 0.38×T2, 0.4×T2, 0.42×T2, 0.44×T2, 0.46×T2, 0.48×T2, or 0.5×T2, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0151] In this embodiment, the thickness T5 of the second metal layer B at the bottom wall 3247 is 0.3mm to 1.8mm. This ensures that the penetration depth when welding the tab 302 to the portion of the fifth surface b5 located on the bottom wall 3247 is less than the thickness T5 of the second metal layer B at the bottom wall 3247, preventing the molten pool from entering the first metal layer A and causing welding defects such as spalls, thus further improving the welding quality.

[0152] Specifically, T5 can be within multiple ranges, including 0.3mm~0.6mm, 0.3mm~0.9mm, 0.3mm~1.2mm, 0.3mm~1.5mm, 0.3mm~1.6mm, 1.5mm~1.8mm, 1.2mm~1.8mm, 0.9mm~1.8mm, 0.6mm~1.8mm, 0.6mm~1.5mm, 0.6mm~1.3mm, 0.9mm~1.2mm, and 0.8mm~1.1mm. The specific range can be selected according to the actual situation. For example, T5 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, or 1.8mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0153] In other embodiments, the thickness T5 of the second metal layer B at the bottom wall 3247 is 10% to 40% of the thickness T12 of the bottom wall 3247. This ensures that the penetration depth when welding the tab 302 to the portion of the fifth surface b5 located on the bottom wall 3247 is less than the thickness T5 of the second metal layer B at the bottom wall 3247, preventing the molten pool from entering the first metal layer A and causing welding defects such as spalls, thus further improving the welding quality.

[0154] Specifically, this percentage range can be 10%–15%, 10%–25%, 10%–35%, 35%–40%, 25%–40%, 15%–40%, 15%–35%, 20%–30%, 15%–25%, and 20%–35%, etc., and can be selected according to the actual situation. For example, this percentage can be 12%, 14%, 16%, 18%, 20%, 23%, 25%, 27%, 29%, 30%, 32%, 34%, 36%, 38%, or 40%, etc., including but not limited to the values ​​listed. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0155] The thickness T3 of the second metal layer B at location 322 in the second region is 0.05mm to 1.5mm. Specifically, T3 can be within multiple ranges, including 0.05mm to 0.3mm, 0.05mm to 0.6mm, 0.05mm to 0.9mm, 0.05mm to 1.2mm, 1.2mm to 1.5mm, 0.9mm to 1.5mm, 0.6mm to 1.5mm, 0.3mm to 1.5mm, 0.75mm to 1.3mm, 0.1mm to 1mm, 0.1mm to 0.8mm, 0.2mm to 0.6mm, and 0.3mm to 0.5mm. The specific thickness can be selected according to the actual situation. For example, T3 can be 0.05mm, 0.25mm, 0.75mm, 0.95mm, 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm, 0.95mm, 1.00mm, 1.10mm, 1.20mm, 1.30mm, 1.40mm, or 1.50mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0156] In other embodiments, the thickness T3 of the second metal layer B at the second region 322 accounts for 10% to 40% of the thickness T11 of the second region 322. Specifically, this percentage range can be within multiple ranges such as 10% to 15%, 10% to 25%, 10% to 35%, 35% to 40%, 25% to 40%, 15% to 40%, 15% to 35%, 20% to 30%, 15% to 25%, and 20% to 35%, which can be selected according to the actual situation. For example, the percentage can be 12%, 14%, 16%, 18%, 20%, 23%, 25%, 27%, 29%, 30%, 32%, 34%, 36%, 38%, or 40%, etc., including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0157] Specifically, in this embodiment, a second interface E is formed between the first metal layer A and the second metal layer B in the second region 322. In the thickness direction Z of the pole post 30, this second interface E protrudes from the first surface b1 of the first connecting portion 31, thereby making the distance by which the second connecting portion 32 sinks relative to the first connecting portion 31 sufficiently large. This minimizes the drawing depth of the connecting sub-portion 324, reduces the drawing difficulty, and improves the drawing quality.

[0158] Furthermore, the height difference h between the second interface E and the first surface b1 in the thickness direction of the pole post 30 is 0.02mm to 1mm, and this height difference can be 0.1mm to 0.5mm. It should be noted that the height difference h is negatively correlated with the thickness of the cover plate 10 located in the second region 322, that is, the larger the height difference h, the thinner the cover plate 10 is located in the second region 322; the smaller the height difference h, the thicker the cover plate 10 is located in the second region 322. In this embodiment, the height difference h is designed to be within a suitable range, that is, the distance by which the second connecting part 32 sinks relative to the first connecting part 31 is limited to a suitable range, which can prevent the part of the cover plate 10 corresponding to the second region 322 from being too thin and thus deformed under pressure.

[0159] It should be noted that h can be 0.02mm, 0.04mm, 0.06mm, 0.08mm or 0.10mm, etc., and no special limitation is made here.

[0160] It should also be noted that the second metal layer B is not limited to extending to each of the second connecting portions 32, each of the transition portions 33, and the first connecting portion 31. For other embodiments, please refer to... Figure 7 and Figure 8As shown, the second metal layer B is only present at each of the second connecting portions 32, while only the first metal layer A is present at each of the transition portions 33 and the first connecting portion 31, and no second metal layer B is present. That is, the pole post 30 has only the first metal layer A at the first connecting portion 31 and each of the transition portions 33, and the pole post 30 has both the first metal layer A and the second metal layer B at each of the second connecting portions 32. In other words, the second connecting portion 32 remains a double-layer structure, and since the transition portion 33 and the first connecting portion 31 do not need to be welded to the negative electrode tab, they are entirely made of aluminum. That is, the copper in the first connecting portion 31 of the previous embodiment is replaced with aluminum. Thus, on the one hand, since the material of the first connecting part 31 is the same as that of the electrical connector, such as aluminum, it can improve the welding quality between the electrical connector and the third surface b3 of the first connecting part 31, as well as the welding quality between the electrode tab 302 and the fifth surface b5. On the other hand, it also greatly reduces the area of ​​the interface formed between the first metal layer A and the second metal layer B. Since the bonding force at the interface between the first metal layer A and the second metal layer B is relatively large, it has an adverse effect on stamping. Therefore, reducing the interface area can greatly reduce the adverse effect of the interface on stamping, which is conducive to reducing the stamping difficulty and improving the stamping quality. On the other hand, since the first metal layer A is made of aluminum and the second metal layer B is made of copper, the amount of copper used can be saved to reduce costs while ensuring the structural strength of the electrode post 30. In other embodiments, the copper position in the first connecting part 31 of the previous embodiment can also be omitted, thereby reducing the overall thickness of the electrode post 30 to a certain extent.

[0161] In other embodiments, the second metal layer B is only present at each of the second connection portions 32, including at least the following situations: (1) The second metal layer B is located on the bottom wall 3247. The area of ​​the second metal layer B on the bottom wall 3247 can be adjusted according to the welding area of ​​the negative electrode tab and the bottom wall 3247. That is, the side of the bottom wall 3247 facing the inside of the battery cell can be entirely composed of the second metal layer B or partially composed of the second metal layer B, as long as the welding effect of the negative electrode tab and the bottom wall 3247 can be guaranteed; (2) The second metal layer B is located on the bottom wall 3247 and extends to the annular sidewall 3245; (3) The second metal layer B is located on the bottom wall 3247 and extends to the annular sidewall 3245 and the second region 322.

[0162] Furthermore, the transition portion 33 has a seventh surface b7, which is located on the same side of the pole post 30 in the thickness direction Z as the second surface b2. That is, the surface of the transition portion 33 facing the cover plate 10 is the seventh surface b7. This seventh surface b7 and the second surface b2 are transitioned by an arc segment 332. Please refer to... Figure 8The second metal layer B has a first interface D at one end near the first connecting portion 31, and there is a preset distance L between the first interface D and the arc segment 332. In this way, the preset distance L is reserved between the first interface D and the arc segment 332 at the corner, which avoids the first interface D of the second metal layer B from extending to the corner and causing adverse effects on the material flow during stamping, which helps to reduce the stamping difficulty and improve the stamping quality.

[0163] In this embodiment, the preset distance L satisfies: 0.5mm ≤ L ≤ 6mm. This design keeps the preset distance L within a suitable range, preventing it from becoming too large. This avoids wasting material on the pole 30 and also prevents the area at this point from becoming too large and encroaching on the area of ​​the first connecting portion 31 and the second connecting portion 32, thus avoiding an excessively small area for the fifth surface b5 welded to the tab 302 and / or the third surface b3 welded to the electrical connector.

[0164] Specifically, the preset distance L can be within multiple ranges, such as 0.5mm≤L≤2mm, 0.5mm≤L≤4mm, 4mm≤L≤6mm, 2mm≤L≤6mm, 2.0mm≤L≤6mm, and 3.0mm≤L≤5mm. The specific range can be selected based on actual needs. For example, the preset distance L can be 0.5mm, 0.7mm, 0.9mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, etc. 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, etc., including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0165] It should be noted that, as one implementation, the electrical connector can be made of aluminum. To ensure the welding quality between the electrical connector and the third surface b3 of the first connection portion 31, the first metal layer A can also be an aluminum layer. Similarly, the tab 302 can be made of copper. To ensure the welding quality between the tab 302 and the fifth surface b5, the second metal layer B can also be a copper layer.

[0166] It should also be noted that the electrode post 30 is not limited to being fabricated using composite materials, meaning that the electrode post 30 is not limited to having only a first metal layer A and a second metal layer B. In some embodiments, the electrode post 30, serving as the positive electrode post, may only have the first metal layer A and not the second metal layer B. For example, when the material of the electrical connector is aluminum and the material of the tab 302 is also aluminum, the electrode post 30 may only have the first metal layer A, which is an aluminum layer. Furthermore, in sodium-ion batteries, both the positive and negative tabs may be made of aluminum, and correspondingly, both the positive and negative electrode posts may also be made of aluminum. That is, in some battery types, both the positive and negative electrode posts may only have the first metal layer A and not the second metal layer B.

[0167] As one embodiment, when the positive electrode tab is made of aluminum and the negative electrode tab is made of copper, the positive electrode post adopts a structure with only a first metal layer A (without a second metal layer B), while the negative electrode post adopts a structure with a first metal layer A and a second metal layer B.

[0168] Please see Figure 1 , Figure 2 and Figure 7 In embodiments of this application, the top cover assembly 100 further includes a first insulating member 20, at least a portion of which forms insulation between the cover plate 10 and the pole post 30. The first insulating member 20 can be injection molded with the pole post 30 first, and then assembled as a whole with the cover plate 10; alternatively, the pole post 30 can be assembled with the cover plate 10 first, and then the first insulating member 20 can be integrally injection molded.

[0169] Specifically, the first insulating member 20 includes a first insulating portion 21 and a second insulating portion 22. The first insulating portion 21 is disposed between the first connecting portion 31 and the cover plate 10 to form an insulation, thereby preventing the cover plate 10 from becoming energized or short-circuited. The second insulating portion 22 covers each of the second connecting portions 32 and each of the transition portions 33, providing insulation protection for the surfaces of each of the second connecting portions 32 and each of the transition portions 33; secondly, increasing the creepage distance from the transition portion 33 to the third surface b3 of the pole post 30, thereby increasing the electrical clearance between the transition portion 33 and the electrical connector after welding the electrical connector; and thirdly, increasing the overall strength of the pole post 30, greatly reducing the risk of deformation of the pole post 30.

[0170] Specifically, in the embodiment, at least one second through hole 330 is provided on the transition portion 33 (see Figure 4 The first insulating member 20 also includes a third insulating portion 23 (see) filled within the second through hole 330. Figure 12The third insulating part 23 is connected to the first insulating part 21 and the second insulating part 22. The first insulating part 21, the second insulating part 22 and the third insulating part 23 are integrally injection molded. Thus, during injection molding, molten injection material is injected into the surface of each second connecting part 32. A portion of the injection material covers the surface of each second connecting part 32 and each transition part 33, and after solidification, forms the second insulating part 22; another portion of the injection material flows through the second through hole 330 into the space between the first connecting part 31 and the cover plate 10, and after solidification, forms the third insulating part 23 in the second through hole 330, and forms the first insulating part 21 between the first connecting part 31 and the cover plate 10. The third insulating part 23 filling the second through hole 330 can compensate for the structural strength loss of the transition part 33 due to the formation of the second through hole 330, and avoid the structural strength of the pole post 30 being too low. Moreover, it can also increase the contact area between the first insulating part 20 and the pole post 30, thereby improving the bonding force between them.

[0171] It should be noted that the second through hole 330 on the transition section 33 serves two purposes: firstly, it facilitates the flow of injection molding material during injection molding; secondly, it reduces the flow area of ​​the transition section 33, ensuring that the transition section 33 can melt and cut off the circuit in time in case of an abnormality.

[0172] In a specific embodiment, the top cover assembly 100 further includes a flanged portion 12. The flanged portion 12 is fixedly connected to the side surface of the cover plate 10 facing away from the cell assembly 300, and a portion of the flanged portion 12 can be bent to the side surface of the second insulating portion 22 facing away from the cover plate 10 using a rolling process, thereby using the flanged portion 12 to press the second insulating portion 22 and the second connecting portion 32 of the electrode post 30 onto the cover plate 10, preventing the electrode post 30 from detaching from the cover plate 10.

[0173] Furthermore, the second insulating portion 22 has a stepped surface 223 extending along its peripheral edge. The flange portion 12 extends along the peripheral edge of the second insulating portion 22 and presses against the stepped surface 223, making the pressing structure of the flange portion 12 against the second insulating portion 22 more stable, thereby making the assembly structure of the pole post 30 and the cover plate 10 more stable and preventing the pole post 30 from shifting position or even detaching from the cover plate 10.

[0174] Specifically, in this embodiment, a second groove 315 is formed on the first surface b1 of the first connecting portion 31, and a third groove 13 is formed on the surface of the cover plate 10 facing the first insulating portion 21. A portion of the first insulating portion 21 fills the second groove 315, and a portion of the first insulating portion 21 also fills the third groove 13. Thus, during injection molding of the first insulating part 20, the molten injection material can flow into the second groove 315 and the third groove 13, and after solidification, form a structure in which a portion of the first insulating portion 21 fills the second groove 315 and the third groove 13.

[0175] Furthermore, at least a portion of the second groove 315 gradually narrows or tapers in a stepped manner from the bottom to the opening, thereby ensuring that the first insulating part 21 is tightly nested on the pole post 30, preventing the pole post 30 from separating from the first insulating member 20. At least a portion of the third groove 13 gradually narrows or tapers in a stepped manner from the bottom to the opening, thereby ensuring that the first insulating part 21 is tightly nested on the cover plate 10, preventing the cover plate 10 from separating from the first insulating member 20.

[0176] In this embodiment, the depth of the second groove 315 is H2, and the thickness of the first connecting portion 31 is T9. H2 and T9 satisfy: H2 = (5%~50%)T9. Thus, by designing the depth of the second groove 315 within a suitable range, it avoids the following: on the one hand, if the depth of the second groove 315 is too shallow, the effect of increasing the bonding force between the first insulating portion 21 and the first connecting portion 31 will be insignificant; on the other hand, it avoids the following: if the depth of the second groove 315 is too deep, the strength of the first connecting portion 31 will be low, making it prone to deformation. It should be noted that H2 can be 5%×T9, 10%×T9, 15%×T9, 20%×T9, 25%×T9, 30%×T9, 35%×T9, 40%×T9, 45%×T9, or 50%×T9, etc., and is not specifically limited here.

[0177] It should be noted that the number of second grooves 315 can be one or more, and no special limitation is made here. When there is only one second groove 315, the second groove 315 is symmetrically arranged on the surface of the first connecting part 31 facing the cover plate 10 relative to the center line of the first connecting part 31, so that the pole post 30 is subjected to more balanced force and avoids defects such as warping or cracking of the pole post 30 due to uneven force. When there are multiple second grooves 315, the multiple second grooves 315 are symmetrically arranged on the surface of the first connecting part 31 facing the cover plate 10 relative to the center line of the first connecting part 31, so that the pole post 30 is subjected to more balanced force and avoids defects such as warping or cracking of the pole post 30 due to uneven force.

[0178] In this embodiment, the depth of the third groove 13 is H3, and the thickness of the cover plate 10 is H4. H3 and H4 satisfy: H3 = (5%~50%)H4. Thus, by designing the depth of the third groove 13 within a suitable range, it avoids both situations where the third groove 13 is too shallow, resulting in an insignificant increase in the bonding force between the first insulating part 21 and the cover plate 10, and where the third groove 13 is too deep, leading to weak strength of the cover plate 10 and easy deformation. It should be noted that H3 can be 5%×H4, 10%×H4, 15%×H4, 20%×H4, 25%×H4, 30%×H4, 35%×H4, 40%×H4, 45%×H4, or 50%×H4, etc., and is not specifically limited here.

[0179] It should be noted that the number of third grooves 13 can be one or more, and no special limitation is made here. When there is only one third groove 13, the third groove 13 is symmetrically arranged on the surface of the cover plate 10 facing the first insulating part 21 relative to the center line of the cover plate 10, so that the cover plate 10 is subjected to more even force and avoids defects such as warping or cracking caused by uneven force. When there are multiple third grooves 13, the multiple third grooves 13 are symmetrically arranged on the surface of the cover plate 10 facing the first insulating part 21 relative to the center line of the cover plate 10, so that the cover plate 10 is subjected to more balanced force and avoids defects such as warping or cracking caused by uneven force.

[0180] In a specific embodiment, the second insulating portion 22 is recessed into the first groove 323 to form a fourth groove 225. That is, the second insulating portion 22 covers the inner wall of the first groove 323 but does not fill the entire first groove 323. On the one hand, this helps to improve the bonding force between the second insulating portion 22 and the second connecting portion 32 of the pole post 30, and avoids the separation or misalignment of the second insulating portion 22 and the second connecting portion 32; on the other hand, it reduces the amount of material used in the second insulating portion 22 and avoids defects such as uneven injection molding due to excessive local thickness.

[0181] In a specific embodiment, the first connecting portion 31 has a boss 311 and an annular surface 312 on the side opposite to the first surface b1. The annular surface 312 is arranged around the boss 311, and the boss 311 protrudes relative to the annular surface 312 in a direction away from the first surface b1. The electrical connector is welded to the boss 311, and the second insulating portion 22 of the first insulating member 20 is lower than or flush with the annular surface 312. Thus, by providing the boss 311, during injection molding, the flow of injection molding material to the boss 311 can be prevented, causing the first insulating member 20 to cover the surface of the boss 311.

[0182] In this embodiment, the protrusion height H1 of the boss 311 relative to the annular surface 312 is 0.05mm to 0.8mm, and H1 can be within multiple ranges such as 0.1mm to 0.6mm or 0.3mm to 0.5mm. It should be noted that H1 can be 0.05mm, 0.20mm, 0.35mm, 0.50mm, 0.65mm or 0.8mm, etc., and is not specifically limited here.

[0183] In a specific embodiment, the top cover assembly 100 further includes a sealing ring 40, which includes a first sealing portion 41 and a second sealing portion 43. Both the first sealing portion 41 and the second sealing portion 43 are sleeved on the connecting sub-part 324, with the first sealing portion 41 located between the inner wall of the first through hole 11 and the connecting sub-part 324, and the second sealing portion 43 located between the side surface of the cover plate 10 facing away from the cell assembly 300 and the second region 322. Thus, on the one hand, the sealing ring 40 seals the first through hole 11 on the cover plate 10, preventing electrolyte leakage from the housing 200 through the first through hole 11; on the other hand, the sealing ring 40 forms insulation between the connecting sub-part 324, the second region 322, and the cover plate 10, preventing electrical conduction between the electrode post 30 and the cover plate 10.

[0184] For specific implementation details, please refer to the following examples. Figure 5 The second region 322 includes a first straight section a1, a first arc section a2, a second straight section a3, and a second arc section a4 connected sequentially. The first straight section a1 and the second straight section a3 are located on both sides of the first region 321 in a first preset direction X, and the first arc section a2 and the second arc section a4 are located on both sides of the first region 321 in a second preset direction Y. The radius of curvature R of the outer edge of the first arc section a2 and the outer edge of the second arc section a4 is 3mm to 8mm, and R can be in multiple ranges such as 4mm to 6mm, 3mm to 5mm, and 5mm to 8mm, which can be selected according to the actual situation. In this way, by setting the radius of curvature R of the outer edge of the first arc section a2 and the outer edge of the second arc section a4 within a suitable range, on the one hand, it is avoided that R is too small, which would prevent the flange 12 from being unable to fold onto the second insulating part 22; on the other hand, it is avoided that R is too large, which would result in an excessively large arc area of ​​the second region 322, thereby avoiding waste of the pole post 30 material.

[0185] It should be noted that R can be 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, etc., and is not limited here.

[0186] It should also be noted that the top cover assembly 100 can be assembled using either pre-injection molding or one-piece injection molding. Please refer to [link / reference]. Figure 11 and Figure 12The pre-injection molding method refers to the following steps: First, the electrode post 30 is formed using a stamping process; then, the first insulating component 20 is injection molded onto the electrode post 30, so that the electrode post 30 and the first insulating component 20 form an integral whole; then, the sealing ring 40 is fitted onto the connecting part 324 of the electrode post 30, and the connecting part 324 of the electrode post 30 is inserted into the first through hole 11 on the cover plate 10; then, the flange 12 is rolled, so that part of the flange 12 is bent onto the second insulating part 22 of the first insulating component 20, thereby pressing the electrode post 30 and the first insulating component 20 onto the cover plate 10, while compressing the sealing ring 40, so that the sealing ring 40 seals the first through hole 11.

[0187] In the pre-injection molding method, since the flanged portion 12 is rolled to the folded state after the first insulating part 20 is injection molded, the second insulating portion 22 of the injection-molded first insulating part 20 does not cover the flanged portion 12.

[0188] Please see Figure 7 and Figure 9 As shown, the integral injection molding method refers to the following steps: First, the electrode post 30 is formed using a stamping process; then, the sealing ring 40 is fitted onto the connecting part 324 of the electrode post 30, and the connecting part 324 is inserted into the first through hole 11 on the cover plate 10; then, the electrode post 30, the sealing ring 40, and the cover plate 10 are installed as a whole into the injection mold for injection molding, thereby injection molding the first insulating part 20 (the flange 12 has been rolled during the injection molding of the first insulating part 20). During the injection molding of the first insulating part 20, pressure is applied to the electrode post 30, so that the electrode post 30 compresses the sealing ring 40, so that the sealing ring 40 maintains a certain amount of compression; after the injection molding is completed, the cover plate 10, the sealing ring 40, the electrode post 30, and the first insulating part 20 are removed from the injection mold as a whole. At this time, the pressure on the pole post 30 disappears, but due to the pressing action of the flange 12 on the first insulating member 20, the pole post 30 and the first insulating member 20 can remain pressed tightly on the cover plate 10, and the sealing ring 40 can also remain in a compressed state.

[0189] In the one-piece injection molding method, since the flanged portion 12 has been rolled to a folded state before the first insulating part 20 is injection molded, the second insulating portion 22 of the injection-molded first insulating part 20 also covers the flanged portion 12.

[0190] Considering that the sealing ring 40 on the side of the connecting sub-part 324 opposite to the first connecting part 31 indirectly bears the pressure from the flange 12, while the pressure on the side of the sealing ring 40 closer to the first connecting part 31 is relatively small, this portion will push upwards against the second region 322 on the side of the connecting sub-part 324 closer to the first connecting part 31. Therefore, the thickness of the second region 322 on the side of the connecting sub-part 324 closer to the first connecting part 31 is configured to be greater than the thickness of the second region 322 on the side of the connecting sub-part 324 opposite to the first connecting part 31. This increases the thickness of the second region 322 on the side of the connecting sub-part 324 closer to the first connecting part 31, thereby increasing the structural strength of this portion.

[0191] The pole post 30 can also be mounted on the housing 200. The structure of the pole post 30 mounted on the housing 200 is similar to that mounted on the cover plate 10, so it will not be described in detail here.

[0192] Based on the aforementioned pole post 30, this application also provides a method for processing the pole post 30. Please see below. Figure 13 and Figure 14 As shown, the processing method includes the following steps:

[0193] Step 1: Provide a sheet material 101. Specifically, the thickness of the sheet material 101 is 2mm to 8mm. The thickness can be within multiple ranges such as 2mm to 4mm, 2mm to 6mm, 6mm to 8mm, 4mm to 8mm, 3mm to 7mm, and 4mm to 6mm, and can be selected according to the actual situation. For example, the thickness of the sheet material can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, etc., without special limitation. It is understood that the sheet material 101 can be a composite sheet material including a first metal layer A and a second metal layer B, or it can be a sheet material including only the first metal layer A.

[0194] In some embodiments, please see Figure 13 and Figure 14 The plate 101 may be a partially composite plate in which a first metal layer A and a second metal layer B are included in a portion (i.e. the area used to form each of the second connecting portions 32), and the remaining area (i.e. the area used to form the first connecting portion 31 and each of the transition portions 33) does not include the second metal layer B.

[0195] In other embodiments, please see Figure 15 The plate 101 may contain a first metal layer A and a second metal layer B in all areas, that is, the area of ​​the plate 101 used to form the first connecting part 31, the area of ​​each transition part 33 and the area of ​​each second connecting part 32 all contain the first metal layer A and the second metal layer B.

[0196] Step 2: Press and draw the sheet metal 101; by pressing the sheet metal 101, a first connecting region 102, a plurality of second connecting regions 103, and a transition region 104 between each second connecting region 103 and the first connecting region 102 are formed on the sheet metal 101; by drawing the sheet metal 101, a first connecting part 31 is formed in the first connecting region 102, a second connecting part 32 is formed in each second connecting region 103, and a transition part 33 is formed in each transition region 104.

[0197] Step 3: The sheet metal 101 is punched to obtain the pole post 30. Specifically, the thickness T9 of the first connecting part 31 is 2mm to 8mm, the thickness T14 of the annular sidewall 3245 of each connecting part 324 is greater than or equal to 0.5mm, and the thickness T12 of the bottom wall 3247 is greater than or equal to 1.2mm, and satisfies T9≥T12>T14.

[0198] Thus, compared with the cutting process that removes material in the prior art, the stamping process of pressing, drawing and cutting in this application is used to process the sheet metal 101 into pole post 30. On the one hand, it is more suitable for mass production, with lower production cost and faster production efficiency; on the other hand, it greatly saves pole post material and reduces material cost.

[0199] It should be noted that in step two, the number of pressing operations is not limited to one, and the number of drawing operations is not limited to one; that is, the plate 101 can be pressed and drawn multiple times. Specifically... Figure 13 and Figure 14 In the illustrated embodiment, the sheet metal 101 undergoes one upsetting and three drawing operations in step two. Alternatively, the sheet metal 101 can be punched in step two to form holes such as the second through hole 330 on the pole post 30. Furthermore, upsetting, drawing, and punching processes can be performed simultaneously.

[0200] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0201] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pole, characterized in that The first connecting part (31) is used for connecting with an electrical connecting piece, and the second connecting part (32) is used for connecting with a tab.

2. The pole according to claim 1, characterized in that The first connecting part (31) is used for connecting with an electrical connecting piece, and the second connecting part (32) is used for connecting with a tab.

3. The pole according to claim 1, wherein The first connecting part (31) and each second connecting part (32) are integrally formed.

4. The pole according to claim 3, characterized in that The first connecting part (31) and each second connecting part (32) are integrally formed by stamping.

5. The pole as claimed in claim 1, characterized in that The second connecting part (32) is provided in two, and the two second connecting parts (32) are respectively connected to two sides of the first connecting part (31) in the first preset direction (X).

6. The pole according to claim 5, characterized in that The distance W2 between the ends of the two second connecting parts (32) away from each other is 20mm-70mm.

7. The pole according to claim 5, wherein The size W6 of each second connecting part (32) in the second preset direction (Y) is 20mm-60mm, and the first preset direction (X), the second preset direction (Y) and the pole thickness direction (Z) are perpendicular to each other.

8. The pole according to claim 3, wherein The side of the first connecting part (31) in the pole thickness direction (Z) is a first surface (b1), each second connecting part (32) has a second surface (b2) on one side in the pole thickness direction (Z), the second surface (b2) is located on the same side of the first surface (b1) in the thickness direction (Z) of the pole (30), the first connecting part (31) further has a third surface (b3) away from the first surface (b1), and the second surface (b2) is located on the side of the first surface (b1) away from the third surface (b3).

9. The pole according to claim 8, characterized in that Each second connecting part (32) further has a fourth surface (b4) away from the second surface (b2); The third surface (b3) protrudes from the side of the second connecting part (32) having the fourth surface (b4) in the pole thickness direction (Z).

10. The pole according to claim 9, characterized in that Each second connecting part (32) comprises a first region (321) and a second region (322) surrounding the first region (321), the second region (322) is connected with the first connecting part (31), and the first region (321) protrudes from the side away from the third surface (b3) relative to the second region (322) to form a connecting sub-part (324).

11. The pole according to claim 10, characterized in that The second surface (b2) located in part of the connecting sub-part (324) is a fifth surface (b5), and part of the fifth surface (b5) is a plane parallel to the third surface (b3).

12. The pole according to claim 11, characterized in that The fifth surface (b5) provided with a protrusion (34) on the part parallel to the third surface (b3).

13. The pole according to claim 10, wherein The fourth surface (b4) is located at a portion of the connector portion (324) having the first groove (323).

14. The pole according to claim 13, characterized in that In the pole thickness direction (Z), a groove bottom of the first groove (323) is located on a side of the first surface (b1) away from the third surface (b3).

15. The pole according to claim 13, wherein The depth dimension D2 of the first groove (323) is 1 mm to 5 mm; and / or The width dimension W4 of the opening of the first groove (323) in the first preset direction (X) is 4 mm to 25 mm, the width dimension W5 of the groove bottom of the first groove (323) in the first preset direction (X) is 2 mm to 20 mm, and W5 < W4.

16. The pole as claimed in claim 13, wherein The connector portion (324) has a bottom wall (3247) and an annular side wall (3245), one end of the annular side wall (3245) is connected to the second region (322), the bottom wall (3247) is connected to the other end of the annular side wall (3245), and the annular side wall (3245) and the bottom wall (3247) together enclose the first groove (323). In the direction from the second region (322) to the bottom wall (3247), the outer contour dimension of the annular side wall (3245) gradually decreases or stepwisely decreases.

17. The pole as claimed in claim 16, wherein The angle between the inner surface of the annular side wall (3245) and an imaginary axis (C) is α, the imaginary axis (C) is parallel to the pole thickness direction (Z), the angle between the outer surface of the annular side wall (3245) and the imaginary axis (C) is β, α is 5° to 60° and / or β is 5° to 60°.

18. The pole according to claim 17, wherein α=β。 19. The pole as set forth in claim 16, wherein The thickness dimension of the annular side wall (3245) is T14, the thickness dimension of the bottom wall (3247) is T12, the thickness dimension of the second region (322) is T11, and T12 ≥ T11 > T14.

20. The pole as claimed in claim 19, wherein T12 and T11 satisfy: T12-T11=0~2 / 3×T11.

21. The pole as set forth in claim 10, wherein The second region (322) includes a first straight line portion (a1), a first circular arc portion (a2), a second straight line portion (a3), and a second circular arc portion (a4) connected in sequence, the first straight line portion (a1) and the second straight line portion (a3) are respectively located on both sides of the first region (321) in the first preset direction (X), the first circular arc portion (a2) and the second circular arc portion (a4) are respectively located on both sides of the first region (321) in the second preset direction (Y), and the first preset direction (X), the second preset direction (Y), and the pole thickness direction (Z) are perpendicular to each other.

22. The pole according to claim 21, wherein The curvature radius R of the outer edge of the first circular arc portion (a2) and the outer edge of the second circular arc portion (a4) is 3 mm to 8 mm.

23. The pole as set forth in claim 8, wherein The side of the first connecting portion (31) away from the first surface (b1) has a boss (311) and an annular surface (312); the annular surface (312) is arranged around the boss (311), and the boss (311) is protrudingly arranged relative to the annular surface (312) in a direction away from the first surface (b1).

24. The pole as claimed in claim 23, wherein The convex height H1 of the convex platform (311) relative to the annular surface (312) is 0.05mm-0.8mm.

25. The pole as set forth in claim 8, wherein The first surface (b1) of the first connecting part (31) is provided with a second groove (315), and at least part of the second groove (315) gradually narrows or stepwisely narrows in the direction from the groove bottom to the groove opening.

26. The pole as claimed in claim 25, wherein The depth dimension of the second groove (315) is H2, the thickness dimension of the first connecting part (31) is T9, and H2 and T9 satisfy: H2=(5%-50%)T9.

27. The pole as set forth in claim 10, wherein The pole column (30) further comprises a transition part (33), and each second connecting part (32) is connected with the corresponding first connecting part (31) through the transition part (33). The end of the transition part (33) connected with the second connecting part (32) is a first end, and the first end at least partially protrudes from one side of the first connecting part (31) having the first surface (b1) in the pole thickness direction (Z).

28. The pole as claimed in claim 27, wherein The minimum flow area of the transition part (33) is smaller than the minimum flow area of the first connecting part (31) and the minimum flow area of the second connecting part (32).

29. The pole as claimed in claim 27, wherein The thickness dimension of the first connecting part (31) is T9, the thickness dimension of the transition part (33) is T13, and the thickness dimension of the second region (322) is T11, and T9≥T11>T13.

30. The pole as claimed in claim 29, wherein, The fourth surface (b4) is located in the part of the connecting sub-part (324) having the first groove (323); the connecting sub-part (324) has a bottom wall (3247) and an annular side wall (3245), one end of the annular side wall (3245) is connected with the second region (322), the bottom wall (3247) is connected at the other end of the annular side wall (3245), and the annular side wall (3245) and the bottom wall (3247) jointly enclose the first groove (323); The thickness dimension of the annular side wall (3245) is T14, the thickness dimension of the bottom wall (3247) is T12, and T9≥T12≥T11>T13>T14.

31. The pole as claimed in claim 27, wherein The pole column (30) comprises a first metal layer (A) and a second metal layer (B), the first metal layer (A) extends to the first connecting part (31) and each second connecting part (32); at each second connecting part (32), the second metal layer (B) and the first metal layer (A) are arranged in a stacked manner in the pole thickness direction (Z), and the side surface of the first metal layer (A) away from the second metal layer (B) comprises the fourth surface (b4), and the side surface of the second metal layer (B) away from the first metal layer (A) comprises a second surface (b2).

32. The pole as claimed in claim 31, wherein The transition part (33) has a seventh surface (b7), the seventh surface (b7) and the second surface (b2) are located on the same side of the pole (30) in the thickness direction (Z), and the seventh surface (b7) and the second surface (b2) are circularly arc transitioned through a circular arc segment (332). The second metal layer (B) has a first interface (D) near one end of the first connecting part (31), and a preset distance L exists between the first interface (D) and the circular arc segment (332).

33. The pole as claimed in claim 32, wherein The preset distance L satisfies 0.5mm≤L≤6mm.

34. The pole as claimed in claim 31, wherein The fourth surface (b4) is located at a part of the connecting sub-part (324) and has a first groove (323); the connecting sub-part (324) has a bottom wall (3247) and an annular side wall (3245), one end of the annular side wall (3245) is connected with the second region (322), and the bottom wall (3247) is connected at the other end of the annular side wall (3245); the annular side wall (3245) and the bottom wall (3247) jointly enclose the first groove (323); The thickness dimension of the second metal layer (B) at the annular side wall (3245) is T7, the thickness of the second metal layer (B) at the second region (322) is T3, and the thickness dimension of the second metal layer (B) at the bottom wall (3247) is T5; T7, T5 and T3 satisfy T5≥T3>T7.

35. The pole as claimed in claim 34, wherein The thickness T5 of the second metal layer (B) at the bottom wall (3247) is 0.3mm-1.8mm; and / or the thickness T5 of the second metal layer (B) at the bottom wall (3247) accounts for 10%-40% of the thickness of the bottom wall (3247).

36. The pole as claimed in claim 34, wherein The thickness T3 of the second metal layer (B) at the second region (322) is 0.05mm-1.5mm; and / or the thickness T3 of the second metal layer (B) at the second region (322) accounts for 10%-40% of the thickness of the second region (322).

37. The pole as described in claim 31, wherein, A second interface (E) is formed between the first metal layer (A) and the second metal layer (B) at the second region (322); In the pole thickness direction (Z), the second interface (E) protrudes from the first surface (b1) of the first connecting part (31).

38. The pole as claimed in claim 31, wherein The second metal layer (B) extends to each of the transition parts (33) and the first connecting part (31).

39. The pole as claimed in claim 38, wherein, The thickness of the second metal layer (B) at the second region (322) is T3, the thickness of the second metal layer (B) at the transition part (33) is T8, and the thickness of the second metal layer (B) at the first connecting part (31) is T2; T3, T8 and T2 satisfy T8 40. The pole as claimed in claim 39, wherein, The fourth surface (b4) is located at a part of the connecting sub-part (324) and has a first groove (323); the connecting sub-part (324) has a bottom wall (3247) and an annular side wall (3245), one end of the annular side wall (3245) is connected with the second region (322), and the bottom wall (3247) is connected at the other end of the annular side wall (3245); the annular side wall (3245) and the bottom wall (3247) jointly enclose the first groove (323); The thickness dimension of the second metal layer (B) at the bottom wall (3247) is T5, the thickness dimension of the second metal layer (B) at the annular sidewall (3245) is T7, and T7 41. The pole as claimed in claim 40, wherein, T5, T3 and T2 satisfy: T5-T3=0~0.5xT2.

42. The pole according to any one of claims 31 to 41, characterized in that The first metal layer (A) is an aluminum layer, and the second metal layer (B) is a copper layer.

43. A cap assembly characterized by, The cover plate (10) and the pole (30) according to any one of claims 1 to 42 are included. The first connecting part (31) is arranged on one side of the cover plate (10), and the first surface (b1) of the first connecting part (31) faces the cover plate (10).

44. A battery cell, characterized by The shell, the electric core assembly and the top cover assembly (100) according to claim 43 are included. The shell is open at least at one end, the electric core assembly is accommodated in the shell, the top cover assembly covers the opening, and the thickness direction of the shell is consistent with the first preset direction; the electric core assembly includes at least two groups of electric cores arranged side by side along the thickness direction of the shell, and at least two groups of the electric cores are arranged in one-to-one correspondence with at least two second connecting parts; the end surface of each group of the electric cores extends out a tab, and the tab of each group of the electric cores is connected with the corresponding second connecting part.

45. A battery cell, characterized by: The shell, the electric core assembly and the pole (30) according to any one of claims 1 to 39 are included, the pole is arranged on the shell, and the electric core assembly is accommodated in the shell.

46. A battery, comprising: A plurality of battery monomers according to claim 44 or 45 are included, a plurality of the battery monomers are electrically connected through an electric connecting piece, and the electric connecting piece is connected to the first connecting part.

47. An electrical device, comprising: The battery monomer according to claim 44 or 45 is included, or the battery according to claim 46 is included.

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