Terminal post, processing method, top cover assembly, battery cell, battery, and electrical device

Abstract

The present application relates to a terminal post and a processing method thereof, a top cover assembly, a battery cell, a battery, and an electrical device. The terminal post includes at least one first connection portion and at least two second connection portions. The at least two second connection portions are arranged at intervals along a first preset direction, and one first connection portion is provided between every two adjacent second connection portions. Each first connection portion is connected to two adjacent second connection portions; the first connection portion is used for connecting with an electrical connection member, and one side surface of the first connection portion in the thickness direction of the terminal post is a first surface; each of the second connection portions protrudes from the first surface of the first connection portion along the thickness direction of the terminal post, and the second connection portion is used for connecting with a tab.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically to a terminal post, a top cover assembly, a battery cell, a battery, and an electrical device. Background Art

[0002] Lithium-ion batteries have the advantages of large energy density, long cycle life, good rate performance, safety, and environmental friendliness, and are important energy products for modern electronic products and electric vehicles. A battery cell is an important component of a battery.

[0003] In a battery cell, there are two technical solutions with and without a connecting piece. In the technical solution with a connecting piece, the tab of the battery core is led out to the terminal post through the connecting piece, so that the terminal post serves as the electrode terminal of the battery cell. However, on the one hand, the presence of the connecting piece leads to an increase in the number of parts, increasing the battery cost; on the other hand, it adds a welding process between the tab and the connecting piece, further increasing the battery cost.

[0004] In the technical solution without a connecting piece, the terminal post is directly connected to the tab. However, due to the limited space on the cover plate, there are restrictions on the position of the terminal post. Therefore, it is necessary to extend the tab to achieve the direct connection between the terminal post and the tab. Extending the tab greatly increases the risk of the tab being inserted into the battery core and the tab being torn. Summary of the Invention

[0005] Based on this, in view of the above problems, it is necessary to provide a terminal post and its manufacturing method, a top cover assembly, a battery cell, a battery, and an electrical device that can omit the connecting piece and avoid lengthening the tab.

[0006] On the one hand, the present application provides a terminal post, including at least one first connecting portion and at least two second connecting portions. The at least two second connecting portions are arranged at intervals along a first preset direction, and one first connecting portion is provided between every two adjacent second connecting portions. Each first connecting portion is connected to the two adjacent second connecting portions; the first connecting portion is used for connecting with an electrical connector, and one side surface of the first connecting portion in the thickness direction of the terminal post is a first surface; each of the second connecting portions protrudes from the first surface of the first connecting portion along the thickness direction of the terminal post, and the second connecting portion is used for connecting with a tab.

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

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

[0009] In some embodiments, the first connection portion and each of the second connection portions are stamped integrally formed structures.

[0010] In some embodiments, two second connection parts are provided, and the two second connection parts are respectively connected to two sides of the first connection part in the first preset direction.

[0011] In some embodiments, a distance W2 between ends of two second connection parts that are away from each other is 20 mm-70 mm.

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

[0013] In some embodiments, each of the second connecting portions has a second surface on one side in the thickness direction of the pole, the second surface and the first surface are located on the same side of the pole in the thickness direction, and the second surface protrudes beyond the first surface of the first connecting portion in the thickness direction of the pole.

[0014] In some embodiments, the first connecting portion further has a third surface opposite to the first surface, and each of the second connecting portions further has a fourth surface opposite to the second surface; in the thickness direction of the pole, the fourth surface is located between the first surface and the third surface.

[0015] The third surface protrudes from a side of the second connection portion having the fourth surface in the thickness direction of the pole.

[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 is connected to the first connecting portion, and the first region protrudes relative to the second region along the thickness direction of the pole to form a connecting sub-portion;

[0017] A surface of the second region facing away from the connecting sub-portion in the thickness direction of the pole is the fourth surface, and a surface of the connecting sub-portion facing away from the second region in the thickness direction of the pole is the second surface.

[0018] In some embodiments, the second region has a fifth surface that is opposite to the fourth surface, and the fifth surface protrudes from the first surface of the first connecting portion in the thickness direction of the pole.

[0019] In some embodiments, a protrusion is provided on the second surface of the connecting sub-part.

[0020] In some embodiments, the connecting sub-portion has a first groove, and a notch of the first groove passes through an end of the connecting sub-portion facing away from the second surface.

[0021] In some embodiments, in the thickness direction of the pole, the bottom of the first groove is located on a side of the first surface away from the third surface.

[0022] In some embodiments, the depth dimension D2 of the first groove is 1 mm to 5 mm; and / or

[0023] A width dimension W4 of the notch of the first groove in the first preset direction is 4 mm to 25 mm, a width dimension W5 of the groove bottom of the first groove in the first preset direction is 2 mm to 20 mm, and W5<W4.

[0024] In some embodiments, the connecting sub-portion 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;

[0025] In the direction from the second area to the bottom wall, the outer contour size of the annular side wall decreases gradually or in a step-like manner.

[0026] In some embodiments, the angle between the inner surface of the annular side wall and an imaginary axis is α, the imaginary axis is parallel to the thickness direction of the pole, and the angle between the outer surface of the annular side wall and the imaginary axis is β; α is 5° to 60° and / or β is 5° to 60°.

[0027] In some of these embodiments, α=β.

[0028] In some embodiments, the thickness dimension of the annular side wall is T14, the thickness dimension of the bottom wall is T12, the thickness dimension of the second region is T11, and T12 ≥ T11 > T14.

[0029] In some of the embodiments, T12 and T11 satisfy: T12-T11=0-2 / 3×T11.

[0030] In some embodiments, the second region includes a first straight portion, a first arc portion, a second straight portion and a second arc portion which are connected end to end in sequence, the first straight portion and the second straight portion are respectively located on both sides of the first region in the first preset direction, the first arc portion and the second arc portion are respectively located on both sides of the first region in the second preset direction, and the first preset direction, the second preset direction and the pole thickness direction are perpendicular to each other.

[0031] In some embodiments, the curvature radius R of the outer edge of the first arc portion and the outer edge of the second arc portion is 3 mm to 8 mm.

[0032] In some embodiments, the first connecting portion has a boss and an annular surface on a 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.

[0033] In some embodiments, a protruding height H1 of the boss relative to the annular surface is 0.05 mm to 0.8 mm.

[0034] In some embodiments, a second groove is formed on the first surface of the first connecting portion, and at least a portion of the second groove gradually narrows or stepwise narrows in a direction from the groove bottom to the groove opening.

[0035] In some embodiments, the depth dimension of the second groove is H2, the thickness dimension of the first connecting portion is T9, and H2 and T9 satisfy: H2=(5%-50%)T9.

[0036] In some embodiments, the pole further includes a transition portion, and each of the second connection portions is connected to the corresponding first connection portion through the transition portion;

[0037] One end of the transition portion connected to the second connection portion is a first end, and the first end at least partially protrudes from a side of the first connection portion having the first surface along the thickness direction of the pole.

[0038] In some embodiments, the flow area of the transition portion is smaller than the flow area of the first connection portion, and smaller than the flow area of the second connection portion.

[0039] In some embodiments, the thickness dimension of the first connecting portion is T9, the thickness dimension of the transition portion is T13, the thickness dimension of the second region is T11, and T9≥T11>T13.

[0040] In some embodiments, the connecting sub-portion has a first groove, and the notch of the first groove passes through an end of the connecting sub-portion away from the second surface; the connecting sub-portion has a bottom wall and an annular side wall, one end of the annular side wall is connected to the second area, 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;

[0041] The thickness dimension of the annular side wall is T14, the thickness dimension of the bottom wall is T12, and T9≥T12≥T11>T13>T14.

[0042] In some of these embodiments, the pole column includes a first metal layer and a second metal layer. The first metal layer extends 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 along the thickness direction of the pole column. And a surface of the first metal layer facing away from the second metal layer includes the fourth surface, a surface of the second metal layer facing away from the first metal layer is the sixth surface, and the sixth surface includes the second surface.

[0043] In some of these embodiments, the transition portion has a seventh surface. The seventh surface and the sixth surface are on the same side of the pole column in the thickness direction, and the seventh surface and the sixth surface are arc-transitioned through an arc segment.

[0044] One end of the second metal layer close to the first connection portion has a first interface, and there is a preset distance L between the first interface and the arc segment.

[0045] In some of these embodiments, the preset distance L satisfies: 0.5 mm ≤ L ≤ 6 mm.

[0046] In some of these embodiments, the connecting sub-portion has a first groove, and an opening of the first groove penetrates through one end of the connecting sub-portion facing away from the second surface. The connecting sub-portion 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.

[0047] A thickness dimension of the second metal layer at the annular side wall is T7, a thickness of the second metal layer at the second region is T3, and a thickness dimension of the second metal layer at the bottom wall is T5. T7, T5, and T3 satisfy: T5 ≥ T3 > T7.

[0048] In some of these 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.

[0049] In some of these embodiments, the thickness T3 of the second metal layer at the second region is 0.05 mm to 1.5 mm; and / or, the thickness T3 of the second metal layer at the second region accounts for 10% to 40% of the thickness of the second region.

[0050] In some of these embodiments, at the second region, a second interface is formed between the first metal layer and the second metal layer.

[0051] In the thickness direction of the pole, the second interface protrudes from the first surface of the first connecting portion.

[0052] In some embodiments, the second metal layer extends to each of the transition portions and the first connecting portion.

[0053] 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.

[0054] In some embodiments, the connecting sub-portion has a first groove, and the notch of the first groove passes through an end of the connecting sub-portion away from the second surface; the connecting sub-portion has a bottom wall and an annular side wall, one end of the annular side wall is connected to the second area, 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;

[0055] The thickness of the second metal layer at the bottom wall is T5, the thickness of the second metal layer at the annular side wall is T7, and T7<T8<T3≤T5≤T2.

[0056] In some of the embodiments, T5, T3 and T2 satisfy: T5-T3=0-0.5×T2.

[0057] In some embodiments, the first metal layer is an aluminum layer, and the second metal layer is a copper layer.

[0058] On the other hand, the present application provides a top cover assembly, including a cover plate and a pole as described in any of the above embodiments;

[0059] The cover plate is provided with a first through hole, the first connection portion is arranged on one side of the cover plate, a first surface of the first connection portion faces the cover plate, and the second connection portion passes through the first through hole to the other side of the cover plate.

[0060] On the other hand, the present application provides a battery cell, characterized in that it includes a shell, a battery cell assembly and a top cover assembly as described in any of the above embodiments;

[0061] At least one end of the housing is open, the battery cell assembly is received in 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 groups of battery cells arranged in parallel along the thickness direction of the housing, and at least two groups of the battery cells are arranged in one-to-one correspondence with at least two of the second connecting parts. The end face of each group of battery cells extends out a tab, and the tabs of each group of battery cells are respectively connected to the corresponding second connecting parts.

[0062] On the other hand, the present application provides a battery, including a plurality of battery monomers as described in any one of the above embodiments. The plurality of battery monomers are electrically connected through electrical connectors, and the electrical connectors are connected to the first connecting parts.

[0063] On the other hand, the present application provides an electrical device, characterized in that it includes a battery monomer as described in any one of the above embodiments, or includes a battery as described in any one of the above embodiments.

[0064] On the other hand, the present application provides a processing method for manufacturing a pole column as described in any one of the above embodiments, including the following steps:

[0065] Provide a sheet material;

[0066] Perform upsetting and drawing on the sheet material; by upsetting the sheet material, a first connecting part area and a plurality of second connecting part areas are formed on the sheet material; by drawing the sheet material, the first connecting part is formed in the first connecting part area, and the second connecting part is formed in each second connecting part area;

[0067] Perform blanking on the sheet material to obtain the pole column.

[0068] Compared with the prior art, the present application has the following beneficial effects:

[0069] In the above pole column, top cover assembly, battery monomer, battery, electrical device and processing method of the pole column, the pole column is directly connected to the tabs of two groups of battery cells through two second connecting parts. On the one hand, the use of a transition piece is avoided, thereby reducing the number of components of the top cover assembly and reducing a welding process; on the other hand, by arranging the two second connecting parts along the arrangement direction of the two groups of battery cells, the two second connecting parts pass through the cover plate through the first through holes on the cover plate and are respectively connected to the tabs of the two groups of battery cells, avoiding the need to extend the tabs, thereby greatly reducing the risk of adverse phenomena such as the tabs being inserted into the battery cells and the tabs being torn. Description of the Drawings

[0070] Figure 1 It is a cross-sectional view of a battery monomer in an embodiment of the present application;

[0071] Figure 2Schematic diagram of the top cover assembly in an embodiment of the present application;

[0072] Figure 3 is Figure 2 Top view of the top cover assembly shown;

[0073] Figure 4 is Figure 2 Schematic diagram of the structure of the terminal post of the top cover assembly shown;

[0074] Figure 5 is Figure 4 Top view of the terminal post shown;

[0075] Figure 6 is Figure 5 Bottom view of the top cover assembly shown;

[0076] Figure 7 is Figure 2 Cross-sectional view of the top cover assembly at the terminal post (the cross-section is perpendicular to the length direction of the cover plate);

[0077] Figure 8 is Figure 7 Cross-sectional view of the terminal post of the top cover assembly shown (the cross-section is perpendicular to the length direction of the cover plate);

[0078] Figure 9 Cross-sectional view of the top cover assembly in another embodiment of the present application (the cross-section is perpendicular to the length direction of the cover plate);

[0079] Figure 10 is Figure 9 Cross-sectional view of the terminal post of the top cover assembly shown (the cross-section is perpendicular to the length direction of the cover plate);

[0080] Figure 11 Cross-sectional view of the top cover assembly in another embodiment of the present application (the cross-section is perpendicular to the length direction of the cover plate);

[0081] Figure 12 Cross-sectional view of the top cover assembly in another embodiment of the present application (the cross-section is perpendicular to the length direction of the cover plate);

[0082] Figure 13 Step demonstration diagram (axonometric view) of the processing method of the terminal post in an embodiment of the present application;

[0083] Figure 14 Demonstrating with the cross-sectional view of the terminal post Figure 13 Step demonstration diagram of the processing method shown;

[0084] Figure 15 Step demonstration diagram (cross-sectional view) of the processing method of the terminal post in another embodiment of the present application. Detailed implementation manners

[0085] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0086] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0087] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0088] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0089] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0090] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0091] An embodiment of the present application provides an electrical device, a battery and a battery cell. The electrical device uses the following battery or battery cell as its power source. Among them, the above electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, an elevator and a lifting device, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys or electric aircraft toys, etc.; Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators and electric planers, etc.; Energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; Amusement devices can be carousels, drop towers, etc.

[0092] The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; For new energy vehicles, the above battery can be used as a driving power source to replace fossil fuels to provide driving power. This application places no special restrictions on the above electrical device.

[0093] The above battery may be a battery pack or a battery module. When the above battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple above-mentioned battery cells. The multiple battery cells can be electrically connected in series, in parallel, or in a mixed way of series and parallel, and are communicatively connected to the battery management system. The battery management system controls and monitors the working states of the individual battery cells. In addition, multiple battery cells can also first form a battery module with a module management system, and then multiple battery modules are electrically connected in series, in parallel, or in a mixed way of series and parallel, and together with the battery management system, they constitute a battery pack.

[0094] The multiple battery cells can be installed on a support structure such as a box body, a frame, or a bracket. The multiple battery cells can be electrically connected through electrical connectors, and the electrical connectors can be busbars. In addition, the multiple battery cells can also be electrically connected by plugging their respective pole columns. For example, between two adjacent battery cells, a slot is provided on the pole column of one battery cell, and a plug is correspondingly provided on the pole column of the other battery cell. The plug is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the pole column of another battery cell. Similarly, the battery cell and the battery management system can also be plugged into each other to achieve electrical connection, which will not be elaborated here. The above battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and its external contour can be cylindrical, flat, cuboid, or other shapes, but is not limited thereto. Specifically, in this embodiment, the above battery cell is a lithium-ion square battery.

[0095] Please refer to Figure 1 , specifically, the battery cell 1 includes a top cover assembly 100, a housing 200, and a core component 300. The housing 200 is a hollow structure, and its interior has a receiving space for accommodating the core component 300, electrolyte, and other components. At least one end of the housing 200 is provided with an opening, and the core component 300 can be loaded into the housing through the opening of the housing 200. Since the battery cell 1 in this embodiment is a square battery, the external contour of the housing 200 is cuboid, and its opening is rectangular. The top cover assembly 100 is installed on the housing 200 and covers the opening of the housing 200, thereby enclosing the core component 300 in the housing 200. Since 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.

[0096] The battery cell assembly 300 is the core component of the battery cell 1. To adapt to the shape of the housing 200, the battery cell assembly 300 in this embodiment is rectangular parallelepiped-shaped. Among them, the battery cell assembly 300 generally includes at least two groups of battery cells 301 arranged in parallel along the thickness direction of the housing 200, and each group of battery cells 301 extends out tabs 302. Each group of battery cells 301 may include one or more battery cells 301. The battery cell 301 can be formed by winding or laminating a positive electrode sheet, a negative electrode sheet, and a separator that plays an insulating role between the negative electrode sheet and the positive electrode sheet. The battery cell 301 formed by winding can be pressed into a flat shape. The tabs 302 of each battery cell 301 are divided into a positive tab (not marked in the figure) and a negative tab (not marked in the figure), and the positive tab and the negative tab are respectively led out from the positive electrode sheet and the negative electrode sheet.

[0097] Among them, the positive tab and the negative tab 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 can be located at the opposite end of the battery cell 301. Specifically, in this embodiment, the battery cell assembly 300 includes two groups of battery cells 301, each group of battery cells 301 includes one battery cell 301, and the positive tab and the negative tab of each battery cell 301 are located at the same end of the battery cell 301 and are spaced along the length direction of the battery cell assembly 300, that is, the length direction of the housing 200. Therefore, a total of four groups of tabs 302 are provided at one end of the battery cell assembly 300, two of which are negative tabs spaced along the width direction of the housing 200, and the other two are positive tabs spaced along the width direction of the housing 200, and the two groups of negative tabs and the two groups of positive tabs are spaced along the length direction of the housing 200. When each group of battery cells 301 includes multiple battery cells 301, the positive tabs of the multiple battery cells 301 are joined together to form a group of positive tabs, and the negative tabs are joined 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 battery cell assembly 300 is also its thickness direction.

[0098] Before the battery cell assembly 300 is installed into the housing 200, it needs to be assembled with the top cover assembly 100 first. Specifically, the tabs 302 of the battery cell assembly 300 need to be electrically connected to the pole posts 30 on the top cover assembly 100 (see Figure 2 ), and then the battery cell assembly 300 is installed into the housing 200. Such an operation will not be restricted by the narrow space inside the housing 200.

[0099] As an implementation manner, the battery cell assembly 300 includes two groups of battery cells 301, and each group of battery cells 301 includes one battery cell 301. That is to say, the battery cell assembly 300 includes a total of two battery cells 301, and the two battery cells 301 are arranged in parallel along the thickness direction of the housing 200.

[0100] The specific structure of the top cover assembly will be elaborated in detail below with reference to the accompanying drawings.

[0101] Please refer to Figures 1 to 4As shown, in the embodiment of the present application, the top cover assembly 100 includes a cover plate 10 and a terminal 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 of a material with relatively high mechanical strength, such as aluminum, aluminum alloy or stainless steel. Specifically, the cover plate 10 in this embodiment is generally rectangular and matches the shape of the opening of the housing 200. A first through hole 11 is formed in the cover plate 10, and the terminal post 30 is installed on the cover plate 10 through the first through hole 11.

[0102] The terminal post 30 is arranged 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 tabs and negative tabs of the battery cell assembly 300 are located at the same end, the cover plate 10 is provided with a positive terminal post and a negative terminal post spaced apart from each other along the length direction. The positive terminal post is used to connect to the positive tabs of each group of battery cells 301, and the negative terminal post is used to connect to the negative tabs of each group of battery cells 301. Of course, for the case where the positive tab and the negative tab are respectively located at both ends of the battery cell assembly 300, only one of the positive terminal post and the negative terminal post 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. And electrical connection members are used to connect the positive terminals and negative terminals of each battery cell 1 to achieve series connection, parallel connection or hybrid connection of each battery cell 1. The electrical connection member can be a bus bar or the terminal post 30 of other battery cells 1.

[0103] It should be noted that since the structures of the positive terminal post and the negative terminal post are similar, for the convenience of understanding, one of the terminal posts 30 is taken as an example in this article. That is to say, the "terminal post" in this article can be a positive terminal post or a negative terminal post (except in the case of clear indication), and the "tab" in this article can be a positive tab or a negative tab (except in the case of clear indication), as long as it is ensured that each tab connected to the positive terminal post is a positive tab and each tab connected to the negative terminal post is a negative tab.

[0104] Specifically, the terminal post 30 includes a first connection portion 31 and two second connection portions 32. The two second connection portions 32 are arranged at intervals along a first preset direction X. A first connection portion 31 is arranged between the two second connection portions 32, and the first connection portion 31 is connected to the adjacent two second connection portions 32. The first connection portion 31 is arranged on the side of the cover plate 10 facing away from the battery cell assembly 300 (i.e., the outside of the cover plate 10) and is used to connect to the electrical connection member. The above-mentioned first preset direction X is consistent with the thickness direction of the housing 200. That is to say, the arrangement direction of the two second connection portions 32 is consistent with the arrangement direction of the two groups of battery cells 301, so that the two second connection portions 32 respectively correspond to the tabs 302 of the two groups of battery cells 301 one by one. At least a part of each second connection portion 32 penetrates through the first through hole 11 on the cover plate 10 and is connected to the corresponding tab 302, thereby realizing the direct connection of the terminal post 30 to each tab 302.

[0105] Further, one side of the first connecting portion 31 facing the cover plate 10 is the first surface b1. Both of the two second connecting portions 32 protrude from the first surface b1 of the first connecting portion 31 along the thickness direction of the pole column 30, such that the two second connecting portions 32 protrude towards the cover plate 10 relative to the first connecting portion 31, so that the two second connecting portions 32 penetrate through the first through hole 11 on the cover plate 10 to the side of the cover plate 10 facing the battery cell assembly 300 (i.e., the inner side of the cover plate 10), and then are respectively connected to the pole tabs 302 of two groups of battery cells 301 in one-to-one correspondence. That is to say, the pole tabs 302 of the two groups of battery cells 301 are respectively connected to the two second connecting portions 32 in one-to-one correspondence, and the two second connecting portions 32 are electrically connected to the first connecting portion 31, such that the first connecting portion 31 serves as an electrode terminal of the battery cell.

[0106] In the above-mentioned top cover assembly 100, the pole column 30 is directly connected to the pole tabs 302 of the two groups of battery cells 301 through the two second connecting portions 32. On the one hand, the use of a transition piece is avoided, thereby reducing the number of components of the top cover assembly 100 and reducing a welding process; on the other hand, by arranging the two second connecting portions 32 along the arrangement direction of the two groups of battery cells 301, the two second connecting portions 32 pass through the first through hole 11 on the cover plate 10 and penetrate through the cover plate 10, and are respectively connected to the pole tabs 302 of the two groups of battery cells 301, avoiding the need to extend the pole tabs 302, thereby greatly reducing the risk of adverse phenomena such as the pole tabs 302 being inserted reversely into the interior of the battery cells 301 and the pole tabs 302 being torn.

[0107] It should be noted that, in order to enable the pole column 30 to be directly connected to the pole tab 302, in the prior art, a method of directly increasing the diameter of the pole column 30 is also adopted. However, in the present application, by arranging the two second connecting portions 32 along the arrangement direction of the two groups of battery cells 301, the two second connecting portions 32 penetrate into the first through hole 11 on the cover plate 10 and can be directly electrically connected to their respective corresponding pole tabs 302, avoiding the need to increase the diameter of the pole column 30, which is beneficial to saving the material of the pole column 30 and reducing the cost of the pole column 30.

[0108] It should also be noted that the number of the first connecting parts 31 is not limited to one, and can be two or more. The number of the second connecting parts 32 is not limited to two, and can be three or more. The numbers of the first connecting parts 31 and the second connecting parts 32 are related to the number of groups of the battery cells 301. Specifically, when the number of groups of the battery cells 301 is N groups, the number of the second connecting parts 32 is also set to N. The N second connecting parts 32 are arranged at intervals along the first preset direction X. One first connecting part 31 is arranged between every two adjacent second connecting parts 32. Every two adjacent second connecting parts 32 are connected to the first connecting part 31 therebetween, that is, the number of the first connecting parts 31 is set to N-1. The N second connecting parts 32 respectively pass through the first through holes 11 on the cover plate 10 and are connected to the pole ears 302 of each group of battery cells 301 in one-to-one correspondence. It should be noted that the number of groups of the battery cells 301 is not the number of the battery cells 301. For example, the battery cell assembly 300 includes four battery cells 301. Two of the battery cells 301 are in one group. The pole ears 302 of the two battery cells 301 are juxtaposed to jointly form a group of pole ears 302 and are connected to one second connecting part 32. The other two battery cells 301 are in one group. The pole ears 302 of the other two battery cells 301 are juxtaposed to jointly form a group of pole ears 302 and are connected to another second connecting part 32. In this way, the number of groups of the battery cells 301 is 2 groups, but the number of the battery cells 301 is 4, and the two are not the same. For the convenience of understanding, in this article, an example is given in which the battery cell assembly 300 includes two groups of battery cells 301, each group of battery cells 301 includes one battery cell 301, and the pole column 30 includes one first connecting part 31 and two second connecting parts 32.

[0109] Specifically in this embodiment, the first through hole 11 on the cover plate 10 can be a through hole with a relatively large single opening range, which can allow 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, and each first through hole 11 only allows one second connecting part 32 to pass through. Please refer to Figure 3 , a first through hole 11 is provided at a position corresponding to the two second connecting parts 32 on the cover plate 10, so that the two second connecting parts 32 respectively pass through one first through hole 11 corresponding to each of them, and then are respectively connected to the two pole ears 302 inside the cover plate 10.

[0110] It can be seen that the first through hole 11 is a through hole with a relatively small opening range, and there is no need to open a hole in the area of the cover plate 10 corresponding to the first connecting part 31. Therefore, the opening area of the cover plate 10 can be reduced, and thus the significant decrease in the structural strength of the cover plate 10 caused by the opening can be avoided.

[0111] Take Figure 3Taking the shown example, four first through holes 11 are formed in the cover plate 10. Two of the first through holes 11 are located at one end of the cover plate 10 in the length direction and are spaced along the width direction of the cover plate 10, and the other two first through holes 11 are located at the other end of the cover plate 10 in the length direction and are also spaced along the width direction of the cover plate 10.

[0112] Further, in the thickness direction of the cover plate 10, the first connecting portion 31 does not overlap with the first through hole 11. That is to say, the orthographic projection of the first connecting portion 31 on the cover plate 10 is located in the area outside the first through hole 11 and does not overlap with the first through hole 11.

[0113] Specifically in this embodiment, the distance W2 between the end portions of the two second connecting portions 32 of the pole column 30 that are away from each other (that is, the length dimension W2 of the pole column 30 in the first preset direction X) is 20 mm to 70 mm. Thus, due to the limited width dimension of the cover plate 10 (that is, the dimension of the cover plate 10 in the first preset direction X), by setting W2 between 20 mm and 70 mm, on the one hand, it is ensured that the two second connecting portions 32 are as close as possible to the two side edges of the cover plate 10 in the first preset direction X. Since the pole ears 302 of the two groups of battery cells 301 are respectively located at positions close to the two side edges of the cover plate 10 in the width direction, the two second connecting portions 32 are as close as possible to their respective corresponding pole ears 302, thereby making the required length dimension of the pole ears 302 smaller and avoiding the need to extend the length of the pole ears 302; on the other hand, the length of the pole column 30 is appropriate, which can ensure that the electrical connection area between the second connecting portion 32 and the pole ear 302 and the electrical connection area between the first connecting portion 31 and the electrical connector are large enough, better meeting the overcurrent requirement, and can also take into account saving materials and reducing costs.

[0114] Specifically, W2 in this embodiment can also be in multiple intervals such as 20 mm to 30 mm, 20 mm to 40 mm, 20 mm to 50 mm, 20 mm to 60 mm, 60 mm to 70 mm, 50 mm to 70 mm, 40 mm to 70 mm, 30 mm to 70 mm, 20 mm to 40 mm, 40 mm to 60 mm, and 30 mm to 50 mm, etc., and can be specifically selected according to actual situations. For example: W2 can be 20 mm, 22 mm, 24 mm, 25 mm, 26 mm, 28 mm, 30 mm, 33 mm, 35 mm, 37 mm, 39 mm, 40 mm, 42 mm, 44 mm, 45 mm, 46 mm, 48 mm, 50 mm, 53 mm, 55 mm, 57 mm, 59 mm, 60 mm, 62 mm, 64 mm, 66 mm, 65 mm, 68 mm, or 70 mm, etc., including but not limited to the listed values, and other values within the above intervals are still applicable and are not specifically limited here.

[0115] In some other embodiments, the distance W2 between the ends of the two second connecting parts 32 away from each other is (W1 - 30 mm) to (W1 - 10 mm), 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 dimension of the cover plate 10, the arrangement directions of the two groups of battery cells 301, and the arrangement directions of the two second connecting parts 32 are the same, the distance value W2 is designed according to the width dimension of the cover plate 10. On the one hand, the two second connecting parts 32 can be as close as possible to the two side edges of the cover plate 10 in the first preset direction X. Since the tabs 302 of the two groups of battery cells 301 are respectively located near the two side edges of the cover plate 10 in the width direction, the two second connecting parts 32 can be as close as possible to their respective corresponding tabs 302, thereby ensuring that the required length dimension of the tabs 302 is relatively small and avoiding the need to extend the length of the tabs 302. On the other hand, the length of the pole column 30 is appropriate, 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 requirement, and can also take into account saving materials and reducing costs.

[0116] Specifically, W2 can be in multiple ranges such as (W1 - 25 mm) to (W1 - 10 mm), (W1 - 20 mm) to (W1 - 10 mm), (W1 - 15 mm) to (W1 - 10 mm), (W1 - 30 mm) to (W1 - 15 mm), (W1 - 30 mm) to (W1 - 20 mm), (W1 - 30 mm) to (W1 - 25 mm), and (W1 - 25 mm) to (W1 - 15 mm). For example: W2 can be (W1 - 30 mm), (W1 - 28 mm), (W1 - 26 mm), (W1 - 24 mm), (W1 - 22 mm), (W1 - 20 mm), (W1 - 19 mm), (W1 - 17 mm), (W1 - 15 mm), (W1 - 13 mm), or (W1 - 10 mm), etc. It includes but is not limited to the listed values, and other values within the above ranges are still applicable and are not specifically defined here.

[0117] Specifically in this embodiment, the dimension W3 of each second connecting part 32 in the first preset direction X satisfies: 3 mm ≤ W3 ≤ 1 / 2 × W2, so as to ensure that the electrical connection area between the second connecting part 32 and the tab 302 is large enough to meet the overcurrent requirement, and at the same time, it can also take into account saving materials and reducing costs.

[0118] Specifically, in the embodiment, the dimension W6 of each second connecting portion 32 in the second preset direction Y is 20 mm to 60 mm. The first preset direction X, the second preset direction Y, and the thickness direction Z of the pole column 30 are perpendicular to each other in pairs. That is to say, 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 pole column 30 is consistent with the thickness direction of the cover plate 10. Thus, by setting W6 between 20 mm and 60 mm, the connection area between the second connecting portion 32 and the corresponding ear 302 is large enough, and on the premise of meeting the overcurrent requirement, materials are saved as much as possible, and the cost is reduced.

[0119] Specifically, W6 in this embodiment can also be in multiple intervals such as 20 mm to 30 mm, 20 mm to 40 mm, 20 mm to 50 mm, 50 mm to 60 mm, 40 mm to 60 mm, 30 mm to 60 mm, 25 mm to 35 mm, 35 mm to 45 mm, 30 mm to 50 mm, and 45 mm to 55 mm, etc., and can be specifically selected according to the actual situation. For example: W6 can be 20 mm, 22 mm, 24 mm, 25 mm, 26 mm, 28 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 53 mm, 55 mm, 57 mm, 59 mm or 60 mm, etc., including but not limited to the listed values, and other values within the above intervals are still applicable, and no special limitation is made here.

[0120] Specifically, in the embodiment, the dimension W7 of the first connecting portion 31 in the second preset direction Y is smaller than W6. Among them, W7 = (40% - 90%)W6. If the dimension of 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 overcurrent; if the dimension of W7 is too large, the size of the original plate required for forming the pole column 30 is too large, which not only increases the weight of the pole column 30 but also wastes materials. Therefore, the proportional relationship between W7 and W6 is limited within a suitable range, so that the connection area between the first connecting portion 31 and the electrical connector is large enough, and on the premise of meeting the overcurrent requirement, the weight of the pole column 30 is reduced as much as possible, materials are saved, and the cost is reduced.

[0121] Specifically, W7 can be within multiple ranges such as (50% - 90%)W6, (60% - 90%)W6, (70% - 90%)W6, (80% - 90%)W6, (80% - 90%)W6, (70% - 90%)W6, (60% - 90%)W6, (50% - 60%)W6, (60% - 70%)W6, (70% - 80%)W6, and (55% - 75%)W6, etc. Specifically, it 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 listed values, and other values within the above ranges are still applicable, and no special limitation is made here.

[0122] 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, and no limitation is made here.

[0123] 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 Figure 7 , the distance J from the central axis of the second connecting portion 32 to the edge of the cover plate 10 is 4 mm - 17 mm. The distance K between the central axis of the first connecting portion 31 and the central axis of the second connecting portion 32 is 0.5 mm - 2 mm. In this way, by setting J and K within a relatively reasonable dimension range, on the one hand, it ensures that the required length dimension of the tab 302 is small, avoiding the need to extend the length of the tab 302; on the other hand, the length of the terminal 30 is appropriate, which can ensure 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 large enough, better meeting the overcurrent requirement, and taking into account saving materials and reducing costs.

[0124] Specifically, J can be within multiple ranges such as 4 mm to 7 mm, 4 mm to 10 mm, 4 mm to 13 mm, 4 mm to 15 mm, 13 mm to 17 mm, 10 mm to 17 mm, 7 mm to 17 mm, 8 mm to 13 mm, 8 mm to 10 mm, 10 mm to 13 mm, and 9 mm to 12 mm. Specifically, it can be selected according to the actual situation. For example, J can be 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.2 mm, 8.4 mm, 8.6 mm, 8.8 mm, 9 mm, 9.3 mm, 9.5 mm, 9.7 mm, 9.9 mm, 10 mm, 10.2 mm, 10.4 mm, 10.6 mm, 10.8 mm, 11 mm, 11.3 mm, 11.5 mm, 11.7 mm, 11.9 mm, 12 mm, 12.2 mm, 12.4 mm, 12.6 mm, 12.8 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, 16.5 mm, or 17 mm, etc. including but not limited to the listed values. Other values within the above ranges are still applicable and are not specifically defined here.

[0125] Specifically, K can be within multiple ranges such as 0.5 mm to 0.8 mm, 0.5 mm to 1.1 mm, 0.5 mm to 1.3 mm, 0.5 mm to 1.7 mm, 1.7 mm to 2 mm, 1.5 mm to 2 mm, 1.1 mm to 2 mm, 0.9 mm to 2 mm, 0.7 mm to 1.5 mm, 0.7 mm to 1 mm, 0.7 mm to 1.3 mm, 1.2 mm to 1.5 mm, and 0.9 mm to 1.3 mm. Specifically, it can be selected according to the actual situation. For example, K can be 0.5 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.7 mm, 1.9 mm, or 2 mm, etc. including but not limited to the listed values. Other values within the above ranges are still applicable and are not specifically defined here.

[0126] Please refer to Figures 4 to 8, in the embodiments of the present application, the first connecting portion 31 further has a third surface b3 facing away from the first surface b1. On both sides of each second connecting portion 32 in the thickness direction Z of the terminal 30, there are respectively a second surface b2 and a fourth surface b4. The second surface b2 and the first surface b1 are on the same side of the terminal 30 in the thickness direction Z, and both the third surface b3 and the fourth surface b4 are on the other side of the terminal 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 of the terminal 30, and the third surface b3 protrudes from the fourth surface b4 of the second connecting portion 32 in the thickness direction of the terminal 30. That is to say, on the side of the terminal 30 away from the cover plate 10, the first connecting portion 31 protrudes from each second connecting portion 32; on the side of the terminal 30 facing the cover plate 10, each second connecting portion 32 protrudes from the first connecting portion 31, so that the terminal 30 forms a structure in which each second connecting portion 32 sinks as a whole relative to the first connecting portion 31 toward the cover plate 10, facilitating the preparation of the terminal 30 by a stamping process, that is, stamping processes such as upsetting and drawing can be used to stamp the sheet material, so that the first connecting portion 31 and each second connecting portion 32 that sinks as a whole relative to the first connecting portion 31 are formed on the sheet material. Compared with the prior art that uses a cutting process of removing materials, the process cost and material cost are greatly reduced.

[0127] Specifically in the embodiment, on the side of each second connecting portion 32 away from the second surface b2 in the thickness direction Z of the terminal 30, there is a fourth surface b4, and the fourth surface is between the first surface b1 and the third surface b3.

[0128] In this embodiment, the first connecting portion 31 and each second connecting portion 32 of the terminal 30 are integrally formed, for example, integrally formed by stamping. That is to say, the first connecting portion 31 and each second connecting portion 32 of the terminal 30 are of an integrally formed structure by stamping. In this way, compared with the prior art that uses a cutting process of removing materials, forming the terminal 30 by a stamping process, on the one hand, it is more adaptable to mass production, improving production efficiency and processing cost; on the other hand, it greatly reduces the waste of the material of the terminal 30 and reduces the material cost of the terminal 30. It should be noted that in other embodiments, other integral forming processes can also be used, such as integral forming by die casting or integral forming by 3D printing, etc., which are not specifically limited herein.

[0129] In the embodiment of the present application, in the process of forming the pole 30 by the stamping process, the corresponding area of the second connection part 32 formed on the plate includes a first area 321 and a second area 322 surrounding the first area 321. The second area 322 of the second connection part 32 is connected to the first connection part 31. The first area 321 of the second connection part 32 is drawn once or multiple times by the drawing process, so that the first area 321 of the second connection part 32 protrudes relative to the second area 322 along the thickness direction Z of the pole 30 to form a connecting sub-portion 324. Among them, the side surface of the second area 322 in the thickness direction Z of the pole 30 away from the cover plate 10 is the above-mentioned fourth surface b4. The second area 322 has a fifth surface b5 away from the above-mentioned fourth surface b4, that is, the side surface of the second area 322 away from the cover plate 10 is the fourth surface b4, and the side surface of the second area 322 facing the cover plate 10 is the fifth surface b5. The distance between the fourth surface b4 and the fifth surface b5 is the thickness dimension of the second area 322. The surface of the connecting sub-portion 324 on one side away from the second region 322 in the thickness direction Z of the pole 30 is the second surface b2, and the pole lug 302 is welded and fixed on the second surface b2 of the connecting sub-portion 324. In this way, the first region 321 of the second connecting portion 32 can be stretched once or multiple times by a stamping process, so that the first region 321 protrudes toward the cover plate 10 relative to the second region 322 to form the connecting sub-portion 324, and the connecting sub-portion 324 is penetrated through the first through hole 11 on the cover plate 10, and then welded and fixed to the corresponding pole lug 302.

[0130] It should be noted that the tab 302 can be welded to the second surface b2 of the connecting sub-part 324 by a welding process, such as laser welding, resistance welding, ultrasonic welding, pressure fusion welding, etc. Alternatively, the tab 302 can be bonded and fixed to the second surface b2 of the connecting sub-part 324 by a conductive adhesive.

[0131] In this embodiment, the tab 302 is welded and fixed on the second surface b2 of the connecting sub-portion 324 by pressure fusion welding. Furthermore, a protrusion 34 is provided on the second surface b2 of the connecting sub-portion 324. During pressure fusion welding, the tab 302 contacts the protrusion 34 on the second surface b2. Since the flow area at the protrusion 34 is small and the heat generation is large, the protrusion 34 on the second surface b2 is melted and the tab 302 is welded and fixed on the second surface b2.

[0132] Specifically in the embodiments, the terminal 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. One end of the transition portion 33 connected to the second connecting portion 32 is the first end, and the first end at least partially protrudes from the first surface b1 of the first connecting portion 31 along the thickness direction Z of the terminal post 30. That is to say, the transition portion 33 extends obliquely relative to the thickness direction Z of the terminal 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 fifth surface b5 of the second region 322 protrudes from the first surface b1 of the first connecting portion 31 in the thickness direction Z of the terminal post 30, that is, the second region 322 of the second connecting portion 32 sinks relative to the first connecting portion 31 as a whole, and further the protruding degree of the connecting sub-portion 324 relative to the first connecting portion 31 is greater, which is beneficial to reducing the drawing depth of the connecting sub-portion 324, reducing the drawing difficulty, and improving the drawing quality of the terminal post 30.

[0133] Further, the transition portion 33 is configured to be the first to fuse when the battery cell 1 undergoes thermal runaway, that is, the transition portion 33 fuses earlier than the first connecting portion 31 and the second connecting portion 32. Specifically in this embodiment, the current-carrying area of the transition portion 33 is smaller than the current-carrying area of the first connecting portion 31 and smaller than the current-carrying area of the second connecting portion 32. The current-carrying area refers to the minimum area when a fluid passes through a certain cross-section. Here, the current-carrying area of the transition portion 33 refers to the surface area of the transition portion 33 perpendicular to the current flow direction, that is, the minimum cross-sectional area of the transition portion 33; similarly, the current-carrying areas of the first connecting portion 31 and the second connecting portion 32 refer to the surface areas of the first connecting portion 31 and the second connecting portion 32 perpendicular to the current flow direction, that is, the minimum cross-sectional areas of the first connecting portion 31 and the second connecting portion 32. Thus, when an abnormality occurs in the circuit during actual use, due to the smaller current-carrying area of the transition portion 33, the temperature rise at the transition portion 33 is faster, and the transition portion 33 can quickly fuse, thereby timely cutting off the circuit, greatly improving the safety of the battery. It can be understood that the transition portion 33 can reduce the current-carrying area by means of grooving, opening holes, and / or thinning, ensuring that it can fuse in time when the circuit is abnormal and cut off the circuit. Among them, the thinning structure can be to thin the thickness of the transition portion 33 as a whole, or a groove structure formed locally on the transition portion 33 and locally thinning the transition portion 33.

[0134] Please continue to refer to Figures 4 to 8 Furthermore, the connecting sub-portion 324 has a first groove 323, and the notch of the first groove 323 penetrates through one end of the connecting sub-portion 324 facing away from the second surface b2, so that the connecting sub-portion 324 has a hollow structure, which is beneficial to reducing the weight of the terminal post 30 and saving the material of the terminal post 30. It can be understood that during the process of drawing the sheet by the die once or multiple times, the first region 321 of the sheet protrudes outward as a whole relative to the second region 322, thereby forming a hollow connecting sub-portion 324.

[0135] In this embodiment, the depth dimension D2 of the first groove 323 is 1 mm to 5 mm. In this way, if the depth of the first groove 323 is too shallow, the second surface b2 of the connecting sub - part 324 will be far from the battery cell 301, and a longer tab 302 will be required; if the depth of the first groove 323 is too deep, the drawing process will be more difficult. In this embodiment, by reasonably designing the depth dimension of the first groove 323, the depth dimension of the first groove 323 is made appropriate, which can not only realize the welding of the tab 302 and the second surface b2 of the connecting sub - part 324 without lengthening the tab 302, but also reduce the difficulty of the drawing process, improve the production efficiency and the yield of the terminal 30.

[0136] Specifically, D2 can be in multiple ranges such as 1 mm to 3 mm, 1 mm to 4 mm, 3 mm to 5 mm, 2 mm to 5 mm, 2 mm to 4 mm, 1 mm to 2.5 mm, and 2.5 mm to 5 mm, etc., and can be specifically selected according to the actual situation. For example: D2 can be 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, etc., including but not limited to the listed values, and other values within the above ranges are still applicable, and no special limitation is made here.

[0137] In this embodiment, the width dimension W4 of the notch of the first groove 323 in the first preset direction X is 4 mm to 25 mm, the width dimension W5 of the bottom of the first groove 323 in the first preset direction X is 2 mm to 20 mm, and W5 < W4. In this way, the first groove 323 is designed to have a wide notch and a narrow bottom, and the specific values of the notch width and the bottom width are reasonably designed, which is convenient for optimizing the material flow during the drawing process, improving the drawing quality, and greatly reducing the risk of wrinkling at the corners.

[0138] Specifically, W4 can be within multiple ranges such as 4 mm to 9 mm, 4 mm to 14 mm, 4 mm to 19 mm, 4 mm to 23 mm, 20 mm to 25 mm, 15 mm to 25 mm, 10 mm to 25 mm, 7 mm to 25 mm, 5 mm to 15 mm, 5 mm to 10 mm, 10 mm to 15 mm, 7 mm to 12 mm, and 8 mm to 18 mm. Specifically, it can be selected according to the actual situation. For example: W4 can be 4 mm, 4.5 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.3 mm, 6.5 mm, 6.7 mm, 6.9 mm, 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm, 8.3 mm, 8.5 mm, 8.9 mm, 9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm, 10 mm, 10.3 mm, 10.5 mm, 10.7 mm, 10.9 mm, 11 mm, 11.2 mm, 11.4 mm, 11.6 mm, 11.8 mm, 12 mm, 12.3 mm, 12.5 mm, 12.7 mm, 12.9 mm, 13 mm, 13.2 mm, 13.4 mm, 13.6 mm, 13.8 mm, 14 mm, 14.3 mm, 14.5 mm, 14.7 mm, 14.9 mm, 15 mm, 15.5 mm, 16 mm, 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, 19 mm, 19.5 mm, 20 mm, 20.5 mm, 21 mm, 21.5 mm, 22 mm, 22.5 mm, 23 mm, 23.5 mm, 24 mm, 24.5 mm, or 25 mm, etc. including but not limited to the listed values. Other values within the above ranges are still applicable and are not specifically defined here.

[0139] Specifically, W5 can be in 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, and can be selected according to actual conditions. 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, 9 mm, 9.5mm, 10mm, 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 20 mm, etc., including but not limited to the listed values. Other values within the above range are still applicable and are not specifically limited here.

[0140] Specifically in this embodiment, the connecting sub-portion 324 has an annular side wall 3245 and a bottom wall 3247. One end of the annular side wall 3245 is connected to the second area 322. The bottom wall 3247 is connected to the other end of the annular side wall 3245, and the end surface of the bottom wall 3247 facing away from the annular side wall 3245 is the above-mentioned second surface b2. The annular side wall 3245 and the bottom wall 3247 are enclosed together to form the above-mentioned first groove 323. In the direction from the second area 322 to the bottom wall 3247, the outer contour size of the annular side wall 3245 is gradually reduced or stepped, so that the connecting sub-portion 324 is in a shape of large at the top and small at the bottom, which is conducive to deep drawing and reduces the difficulty of processing; on the other hand, it makes it easy to insert the connecting sub-portion 324 into the corresponding first through hole 11 on the cover plate 10 during assembly, reducing the difficulty of assembly; on the other hand, the opening range of the first through hole 11 is relatively small, so that the structural strength of the cover plate 10 can be significantly reduced due to the opening.

[0141] See also Figure 10, in this embodiment, the included angle between the inner surface of the annular side wall 3245 and a virtual axis C is α, and the virtual axis C is parallel to the thickness direction of the pole column 30. The included angle between the outer surface of the annular side wall 3245 and the virtual axis C is β. Where α = β. α can be 5° to 60° and / or β can be 5° to 60°. In this way, by reasonably designing the specific values of the angles α and β, the inclination degree of the annular side wall 3245 is moderate, which is convenient for improving the material flow during the drawing process, enhancing the drawing quality, and greatly reducing the risk of wrinkling at the corners. In other embodiments, α and β may not be equal.

[0142] Specifically, α can be in multiple intervals such as 5° to 15°, 5° to 25°, 5° to 35°, 5° to 45°, 5° to 55°, 50° to 60°, 40° to 60°, 30° to 60°, 20° to 60°, 10° to 60°, 15° to 60°, 20° to 50°, 30° to 40°, 30° to 50°, 50° to 60°, and 15° to 45°. Specifically, it 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 listed values. Other values within the above intervals are still applicable and are not specifically limited here.

[0143] Specifically, β can be in multiple intervals such as 5° to 15°, 5° to 25°, 5° to 35°, 5° to 45°, 5° to 55°, 50° to 60°, 40° to 60°, 30° to 60°, 20° to 60°, 10° to 60°, 15° to 60°, 20° to 50°, 30° to 40°, 30° to 50°, 50° to 60°, and 15° to 45°. Specifically, it 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 listed values. Other values within the above intervals are still applicable and are not specifically limited here.

[0144] Further, the thickness dimension of the first connecting portion 31 is T9, the thickness dimension of the transition portion 33 is T13, the thickness dimension of the second region 322 is T11, the thickness dimension of the annular side wall 3245 is T14, and the thickness dimension of the bottom wall 3247 is T12, and the following is satisfied: T9≥T12≥T11>T13>T14. Further, T12 and T11 satisfy: T12 - T11 = 0 to 2 / 3×T11. In this way, by reasonably designing the thickness dimensions of each part of the terminal post 30, the material flow situation during the drawing process can be further optimized, the drawing difficulty can be reduced, and the production efficiency and yield can be improved.

[0145] Specifically, T12 - T11 can be in multiple intervals such as 0 to 1 / 6×T11, 0 to 1 / 3×T11, 0 to 1 / 2×T11, 1 / 2×T11 to 2 / 3×T11, 1 / 3×T11 to 2 / 3×T11, 1 / 6×T11 to 2 / 3×T11, 1 / 6×T11 to 1 / 2×T11, 1 / 6×T11 to 1 / 3×T11, and 1 / 3×T11 to 1 / 2×T11, etc., and can be specifically 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, and other values within the above intervals are still applicable, and no special limitation is made here.

[0146] 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 tab through the bottom wall 3247. Therefore, the thicknesses of the first connecting portion 31 and the bottom wall 3247 are 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 side wall 3245 of each connecting sub - portion 324 is greater than or equal to 0.5 mm.

[0147] Specifically, T9 can be within multiple ranges such as 2mm - 4mm, 2mm - 6mm, 6mm - 8mm, 4mm - 8mm, 3mm - 7mm, 4mm - 6mm, 3mm - 5mm, and 4mm - 7mm, etc., and can be specifically 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, 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, etc., including but not limited to the listed values, and other values within the above ranges are still applicable, and no special limitation is made here.

[0148] Specifically, T12 can be within multiple ranges such as 1.2 mm - 2 mm, 1.2 mm - 4 mm, 2 mm - 6 mm, 6 mm - 8 mm, 4 mm - 8 mm, 2 mm - 8 mm, 3 mm - 7 mm, 4 mm - 6 mm, 3 mm - 5 mm, and 4 mm - 7 mm, etc. The specific value can be selected according to the actual situation. For example: T9 can be 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, 7 mm, 7.1 mm, 7.2 mm, 7.3 mm, 7.4 mm, 7.5 mm, 7.6 mm, 7.7 mm, 7.8 mm, 7.9 mm, or 8 mm, etc., including but not limited to the listed values. Other values within the above ranges are still applicable and are not specifically defined here.

[0149] Specifically, T14 can be within multiple ranges such as 0.5 mm - 1.5 mm, 0.5 mm - 2.5 mm, 0.5 mm - 3.5 mm, 0.5 mm - 4.5 mm, 0.5 mm - 6 mm, 4.5 mm - 6 mm, 3 mm - 6 mm, 1 mm - 6 mm, 1 mm - 5 mm, 2 mm - 4 mm, 0.5 mm - 3 mm, 3 mm - 6 mm, and 2 mm - 4 mm, etc. Specifically, it can be selected according to the actual situation. For example, T14 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, or 6 mm, including but not limited to the listed values. Other values within the above ranges are still applicable and are not specifically limited here.

[0150] It should also be noted that the thickness dimension of the second region 322 at the side of the connecting sub - part 324 away from the first connecting part 31 and the thickness dimension of the side of the connecting sub - part 324 close to the first connecting part 31 can be equal or not equal, and are not limited here. Similarly, the thickness dimension of the annular side wall 3245 at the side of the first groove 323 away from the first connecting part 31 and the thickness dimension of the side of the first groove 323 close to the first connecting part 31 can be equal or not equal, and are not limited here.

[0151] The pole 30 as the positive pole column is generally integrally formed of aluminum material and can be directly in contact with and welded to the positive electrode tab of the battery cell assembly. Since the material of the positive pole column is the same as that of the positive electrode tab of the battery cell assembly, the welding effect with the positive electrode tab can be improved.

[0152] Please refer to Figure 9 and Figure 10As shown in the figure, the pole column 30 serving as the negative electrode includes a first metal layer A and a second metal layer B stacked along the thickness direction Z of the pole column 30. Both the first metal layer A and the second metal layer B extend to the first connection portion 31, each transition portion 33, and each second connection portion 32. One side surface of the first metal layer A facing away from the second metal layer B includes the above-mentioned third surface b3 and fourth surface b4, and one side surface of the second metal layer B facing away from the first metal layer A is the sixth surface, and this sixth surface includes the above-mentioned first surface b1 and second surface b2. That is to say, the second metal layer B is located on the side of the first metal layer A facing the battery cell assembly 300, so that the second surface b2 is the second metal layer B, that is, the pole ear 302 is welded to the second metal layer B at the second surface b2; the third surface b3 of the first connection portion 31 is the first metal layer A, that is, the electrical connector is welded to the first metal layer A at the third surface b3.

[0153] In this way, using a composite plate to prepare the pole column 30 ensures that the pole ear 302 is welded to the second metal layer B at the connecting sub-portion 324. The second metal layer B can be made of the same material as the corresponding pole ear 302, or a material that is easily welded to the corresponding pole ear 302, ensuring the welding quality between the pole ear 302 and the second surface b2 of the connecting sub-portion 324. Similarly, using a composite plate to prepare the pole column 30 ensures that the electrical connector is welded to the first metal layer A at the first connection portion 31. The 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 connection portion 31. More specifically, in this embodiment, the first metal layer is an aluminum layer, the second metal layer is a copper layer, and the pole column 30 is made of a copper-aluminum composite plate through a stamping process. Since the material of the negative pole ear of the battery cell assembly is generally also copper, the second metal layer B has the same material as the negative pole ear, which can improve the welding effect between the negative pole column and the negative pole ear.

[0154] Specifically in this embodiment, the thickness of the second metal layer B at the first connection portion 31 is T2, the thickness of the second metal layer B at the second region 322 is T3, 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 side wall 3245 is T7, and the thickness of the second metal layer B at the transition portion 33 is T8. Among them, T2, T3, T5, T7, and T8 satisfy: T7 < T8 < T3 ≤ T5 ≤ T2. Further, T5, T3, and T2 satisfy: T5 - T3 = 0 to 0.5×T2.

[0155] Specifically, T5 - T3 can be within multiple ranges such as 0 to 0.1×T2, 0 to 0.2×T2, 0 to 0.3×T2, 0 to 0.4×T2, 0.4×T2 to 0.5×T2, 0.3×T2 to 0.5×T2, 0.2×T2 to 0.5×T2, 0.05×T2 to 0.45×T2, 0.1×T2 to 0.4×T2, and 0.15×T2 to 0.35×T2. Specifically, it 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. It includes but is not limited to the listed values, and other values within the above ranges are still applicable and are not specifically limited here.

[0156] In this embodiment, the thickness T5 of the second metal layer B at the bottom wall 3247 is 0.3 mm to 1.8 mm. In this way, it is ensured that the penetration depth when welding the tab 302 to the second surface b2 of the bottom wall 3247 is less than the thickness T5 of the second metal layer B at the bottom wall 3247, avoiding welding defects such as explosion points caused by the molten pool entering the first metal layer A, and further improving the welding quality.

[0157] Specifically, T5 can be within multiple ranges such as 0.3 mm to 0.6 mm, 0.3 mm to 0.9 mm, 0.3 mm to 1.2 mm, 0.3 mm to 1.5 mm, 0.3 mm to 1.6 mm, 1.5 mm to 1.8 mm, 1.2 mm to 1.8 mm, 0.9 mm to 1.8 mm, 0.6 mm to 1.8 mm, 0.6 mm to 1.5 mm, 0.6 mm to 1.3 mm, 0.9 mm to 1.2 mm, and 0.8 mm to 1.1 mm. Specifically, it can be selected according to the actual situation. For example, T5 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, or 1.8 mm, etc. It includes but is not limited to the listed values, and other values within the above ranges are still applicable and are not specifically limited here.

[0158] In other embodiments, the thickness T5 of the second metal layer B at the bottom wall 3247 accounts for 10% to 40% of the thickness T12 of the bottom wall 3247. In this way, it is ensured that the penetration depth when the tab 302 is welded to the second surface b2 of the bottom wall 3247 is less than the thickness T5 of the second metal layer B at the bottom wall 3247, avoiding welding defects such as explosion points caused by the molten pool entering the first metal layer A, and further improving the welding quality.

[0159] Specifically, this proportional range can be within multiple ranges such as 10% - 15%, 10% - 25%, 10% - 35%, 35% - 40%, 25% - 40%, 15% - 40%, 15% - 35%, 20% - 30%, 15% - 25%, and 20% - 35%. Specifically, it can be selected according to the actual situation. For example, this ratio can be 12%, 14%, 16%, 18%, 20%, 23%, 25%, 27%, 29%, 30%, 32%, 34%, 36%, 38%, or 40%, etc. It includes but is not limited to the listed values, and other values within the above ranges are still applicable and are not specifically limited here.

[0160] The thickness T3 of the second metal layer B at the second region 322 is 0.05 mm to 1.5 mm. Specifically, T3 can be within multiple ranges such as 0.05 mm - 0.3 mm, 0.05 mm - 0.6 mm, 0.05 mm - 0.9 mm, 0.05 mm - 1.2 mm, 1.2 mm - 1.5 mm, 0.9 mm - 1.5 mm, 0.6 mm - 1.5 mm, 0.3 mm - 1.5 mm, 0.75 mm - 1.3 mm, 0.1 mm - 1 mm, 0.1 mm - 0.8 mm, 0.2 mm - 0.6 mm, and 0.3 mm - 0.5 mm. Specifically, it can be selected according to the actual situation. For example, T3 can be 0.05 mm, 0.25 mm, 0.75 mm, 0.95 mm, 0.10 mm, 0.15 mm, 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm, 0.55 mm, 0.60 mm, 0.65 mm, 0.70 mm, 0.75 mm, 0.80 mm, 0.85 mm, 0.90 mm, 0.95 mm, 1.00 mm, 1.10 mm, 1.20 mm, 1.30 mm, 1.40 mm, or 1.50 mm, etc. It includes but is not limited to the listed values, and other values within the above ranges are still applicable and are not specifically limited here.

[0161] 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, the ratio range can be 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%, etc., which can be selected according to actual conditions. For example: the ratio can be 12%, 14%, 16%, 18%, 20%, 23%, 25%, 27%, 29%, 30%, 32%, 34%, 36%, 38% or 40%, including but not limited to the listed values, and other values in the above ranges are still applicable and are not specifically limited here.

[0162] Specifically in this embodiment, at the second region 322, a second interface E is formed between the first metal layer A and the second metal layer B. In the thickness direction Z of the pole 30, the second interface E protrudes from the first surface b1 of the first connecting portion 31, so that the overall sinking distance of the second connecting portion 32 relative to the first connecting portion 31 is sufficiently large, thereby reducing the drawing depth of the connecting sub-portion 324 as much as possible, reducing the drawing difficulty, and improving the drawing quality.

[0163] Furthermore, the height difference h between the second interface E and the first surface b1 in the thickness direction of the pole 30 is 0.02mm-1mm, and the height difference can be 0.1mm-0.5mm. It should be noted that the height difference h is negatively correlated with the thickness of the cover plate 10 in the second area 322, that is, the greater the height difference h, the thinner the thickness of the cover plate 10 in the second area 322; the smaller the height difference h, the thicker the thickness of the cover plate 10 in the second area 322. In this embodiment, the height difference h is designed within a suitable range, that is, the distance of the overall sinking of the second connection part 32 relative to the first connection part 31 is limited within a suitable range, which can avoid the portion of the cover plate 10 corresponding to the second area 322 being compressed and deformed due to being too thin.

[0164] It should be noted that h can be 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm or 0.10 mm, etc., and is not particularly limited here.

[0165] It should also be noted that the second metal layer B is not limited to extending to each second connection portion 32, each transition portion 33 and the first connection portion 31. In other embodiments, see Figure 7 and Figure 8As shown, the second metal layer B is only present at each second connection portion 32, while only the first metal layer A is present at each transition portion 33 and the first connection portion 31, and the second metal layer B is absent. That is to say, the terminal post 30 only has the first metal layer A at the first connection portion 31 and each transition portion 33, and the terminal post 30 has the first metal layer A and the second metal layer B at each second connection portion 32. That is to say, the second connection portion 32 is still a double-layer structure. Since the transition portion 33 and the first connection portion 31 do not need to be welded to the negative electrode tab, the overall structure is made of aluminum material. That is, the position where copper was set in the first connection portion 31 in the previous embodiment is replaced with aluminum. In this way, on the one hand, since the overall material of the first connection portion 31 is the same as that of the electrical connector, for example, both are made of aluminum material, it can improve the welding quality between the electrical connector and the third surface b3 of the first connection portion 31, and improve the welding quality between the electrode tab 302 and the second surface b2 of the second connection portion 32. 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 forming. Therefore, reducing the interface area can greatly weaken the adverse effect of the interface on stamping forming, which is beneficial to reducing the stamping difficulty and improving the stamping quality. On the third hand, the first metal layer A is made of aluminum material, and the second metal layer B is made of copper material, which can save the amount of copper used to reduce costs while ensuring the structural strength of the terminal post 30. In other embodiments, the position where copper was set in the first connection portion 31 in the previous embodiment can also be missing, so as to reduce the overall thickness of the terminal post 30 to a certain extent.

[0166] In other embodiments, the second metal layer B is only present at each second connection portion 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 located on the bottom wall 3247 can be adjusted according to the welding area between the negative electrode tab and the bottom wall 3247. That is to say, the surface 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 between the negative electrode tab and the bottom wall 3247 can be ensured; (2) The second metal layer B is located on the bottom wall 3247 and extends to the annular side wall 3245; (3) The second metal layer B is located on the bottom wall 3247 and extends to the annular side wall 3245 and the second region 322.

[0167] Furthermore, the transition portion 33 has a seventh surface b7, and the seventh surface b7 and the sixth surface b6 are on the same side of the terminal post 30 in the thickness direction Z. That is to say, the surface of the transition portion 33 facing the cover plate 10 is the seventh surface b7. The seventh surface b7 and the sixth surface b6 are arc-transitioned through an arc segment 332. Please refer to Figure 8, one end of the second metal layer B close to the first connecting portion 31 has a first interface D, and there is a preset distance L between the first interface D and the arc segment 332. In this way, a preset distance L is reserved between the first interface D and the arc segment 332 at the corner, preventing the first interface D of the second metal layer B from extending to the corner and having an adverse effect on the material flow during stamping, which is beneficial to reducing the stamping difficulty and improving the stamping quality.

[0168] In this embodiment, the preset distance L satisfies: 0.5 mm ≤ L ≤ 6 mm. In this way, the preset distance L is designed within a suitable range, so that the preset distance L is not too large. On the one hand, it avoids waste of the material of the pole 30, and on the other hand, it avoids the area here being too large and squeezing the areas of the first connecting portion 31 and the second connecting portion 32, thereby resulting in too small areas of the second surface b2 welded to the tab 302 and / or the third surface b3 welded to the electrical connector.

[0169] Specifically, the preset distance L can be in multiple intervals such as 0.5 mm ≤ L ≤ 2 mm, 0.5 mm ≤ L ≤ 4 mm, 4 mm ≤ L ≤ 6 mm, 2 mm ≤ L ≤ 6 mm, 2.0 mm ≤ L ≤ 6 mm, and 3.0 mm ≤ L ≤ 5 mm, etc., and can be specifically selected according to the actual situation. For example: the preset distance L can be 0.5 mm, 0.7 mm, 0.9 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, etc., including but not limited to the listed values, and other values within the above intervals are still applicable, and no special limitations are made here.

[0170] It should be noted that, as an implementation manner, the material of the electrical connector can be aluminum. In order to ensure the welding quality between the electrical connector and the third surface b3 of the first connecting portion 31, the first metal layer A can also be an aluminum layer. Similarly, the material of the tab 302 can be copper. In order to ensure the welding quality between the tab 302 and the second surface b2 of the connecting sub - portion 324, the second metal layer B can also be a copper layer.

[0171] It should also be noted that the terminal post 30 is not limited to being prepared using composite plates, that is, the terminal post 30 is not limited to having the first metal layer A and the second metal layer B. In some other embodiments, the terminal post 30 as the positive terminal post may only have the first metal layer A and not have 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 terminal post 30 may only have the first metal layer A, and the first metal layer A is an aluminum layer. In addition, in a sodium-ion battery, the materials of the positive tab and the negative tab can both be aluminum. Correspondingly, the materials of the positive terminal post and the negative terminal post are also both aluminum. That is, in some battery types, the positive terminal post and the negative terminal post can both only have the first metal layer A and not have the second metal layer B.

[0172] As an embodiment, when the material of the positive tab is aluminum and the material of the negative tab is copper, the positive terminal post adopts a structure with only the first metal layer A (without the second metal layer B), and the negative terminal post adopts a structure with the first metal layer A and the second metal layer B.

[0173] Please refer to Figure 1 、 Figure 2 and Figure 7 In the embodiments of the present application, the top cover assembly 100 further includes a first insulating member 20. At least a part of the first insulating member 20 forms insulation between the cover plate 10 and the terminal post 30. The first insulating member 20 can be injection-molded with the terminal post 30 first and then assembled with the cover plate 10 as a whole; or the terminal post 30 can be assembled to the cover plate 10 first, and then the first insulating member 20 is integrally injection-molded.

[0174] 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 insulation, thereby preventing the cover plate 10 from being charged or short-circuited. The second insulating portion 22 covers each of the second connecting portions 32 and each of the transition portions 33. On the one hand, it provides insulation protection for the surfaces of each of the second connecting portions 32 and each of the transition portions 33; on the other hand, it can increase the creepage distance from the transition portion 33 to the third surface b3 of the terminal post 30 and increase the electrical clearance between the transition portion 33 and the electrical connector after welding the electrical connector; on the third hand, it increases the overall strength of the terminal post 30 and greatly reduces the risk of deformation of the terminal post 30.

[0175] Specifically in the embodiment, at least one second through hole 330 (see Figure 4 ) is formed in the transition portion 33, and the first insulating member 20 further includes a third insulating portion 23 filled in the second through hole 330 (see Figure 12), the 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. In this way, when injection-molding, the molten injection material is injected onto the surfaces of the respective second connecting parts 32. A part of the injection material covers the surfaces of the respective second connecting parts 32 and the respective transition parts 33, and after curing, forms the second insulating part 22; another part of the injection material flows into the space between the first connecting part 31 and the cover plate 10 through the second through-hole 330, and after curing, 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 filled in the second through-hole 330 can make up for the structural strength lost by the transition part 33 due to the formation of the second through-hole 330, and avoid the structural strength of the pole column 30 from being too low. Moreover, it can also increase the contact area between the first insulating part 20 and the pole column 30, thereby enhancing the bonding force between the two.

[0176] It should be noted that the second through-hole 330 on the transition part 33, on the one hand, plays a role in circulating the injection material during injection-molding, and on the other hand, also plays a role in reducing the current-carrying area of the transition part 33, ensuring that the transition part 33 can be melted and cut off in time to cut off the circuit in case of an abnormality.

[0177] Specifically in the embodiment, the top cover assembly 100 further includes a flanging part 12. The flanging part 12 is fixedly connected to the surface of the cover plate 10 facing away from the battery cell assembly 300, and a part of the flanging part 12 can be bent to the surface of the second insulating part 22 facing away from the cover plate 10 by a hemming process, so as to press the second insulating part 22 and the second connecting part 32 of the pole column 30 against the cover plate 10 by using the flanging part 12, and avoid the pole column 30 from detaching from the cover plate 10.

[0178] Furthermore, the second insulating part 22 has a stepped surface 223 extending along its circumferential edge. The flanging part 12 extends along the circumferential edge of the second insulating part 22 and presses against the stepped surface 223, making the pressing structure of the flanging part 12 against the second insulating part 22 more stable, and further making the assembly structure of the pole column 30 and the cover plate 10 more stable, and avoiding the pole column 30 from being displaced or even detaching from the cover plate 10.

[0179] Specifically in the embodiment, a second groove 315 is formed on the first surface b1 of the first connecting part 31, and a third groove 13 is formed on the surface of the cover plate 10 facing the first insulating part 21. A part of the first insulating part 21 is filled in the second groove 315, and a part of the first insulating part 21 is also filled in the third groove 13. In this way, when the first insulating part 20 is injection-molded, the molten injection material can flow into the second groove 315 and the third groove 13, and after curing, a structure is formed in which a part of the first insulating part 21 is filled in the second groove 315 and the third groove 13.

[0180] Furthermore, at least part of the second groove 315 gradually narrows or stepwise narrows in the direction from the groove bottom to the groove opening, so that the first insulating portion 21 is tightly nested on the pole column 30 through the second groove 315, preventing the pole column 30 from separating from the first insulating member 20. At least part of the third groove 13 gradually narrows or stepwise narrows in the direction from the groove bottom to the groove opening, so that the first insulating portion 21 is tightly nested on the cover plate 10 through the third groove 13, preventing the cover plate 10 from separating from the first insulating member 20.

[0181] In this embodiment, the depth dimension of the second groove 315 is H2, and the thickness dimension of the first connecting portion 31 is T9. H2 and T9 satisfy: H2 = (5% - 50%)T9. In this way, by designing the depth of the second groove 315 within a suitable range, on the one hand, it avoids the situation where the depth of the second groove 315 is too shallow, resulting in an insignificant effect of increasing the bonding force between the first insulating portion 21 and the first connecting portion 31; on the other hand, it avoids the situation where the depth of the second groove 315 is too deep, resulting in a low strength of the first connecting portion 31 and easy 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 no special limitation is made here.

[0182] It should be noted that the number of the second grooves 315 can be one or multiple, and no special limitation is made here. When the number of the second grooves 315 is one, the second groove 315 is symmetrically arranged on one side surface of the first connecting portion 31 facing the cover plate 10 with respect to the center line of the first connecting portion 31, making the force on the pole column 30 more balanced and preventing the pole column 30 from being warped or cracked due to uneven force. When the number of the second grooves 315 is multiple, the multiple second grooves 315 are symmetrically arranged on one side surface of the first connecting portion 31 facing the cover plate 10 with respect to the center line of the first connecting portion 31, making the force on the pole column 30 more balanced and preventing the pole column 30 from being warped or cracked due to uneven force.

[0183] In this embodiment, the depth dimension of the third groove 13 is H3, and the thickness dimension of the cover plate 10 is H4, where H3 and H4 satisfy: H3 = (5% - 50%)H4. In this way, by designing the depth of the third groove 13 within an appropriate range, on the one hand, it avoids the situation where the depth of the third groove 13 is too shallow, resulting in an insignificant effect of increasing the bonding force between the first insulating portion 21 and the cover plate 10; on the other hand, it avoids the situation where the depth of the third groove 13 is too deep, resulting in a weak strength of the cover plate 10 and being prone to 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 no special limitation is made here.

[0184] It should be noted that the number of the third grooves 13 can be one or multiple, and no special limitation is made here. When the number of the third grooves 13 is one, the third groove 13 is symmetrically arranged on one side surface of the cover plate 10 facing the first insulating portion 21 relative to the center line of the cover plate 10, so that the cover plate 10 is more evenly stressed and avoids defects such as warping or cracking of the cover plate 10 due to uneven stress. When the number of the third grooves 13 is multiple, the multiple third grooves 13 are symmetrically arranged on one side surface of the cover plate 10 facing the first insulating portion 21 relative to the center line of the cover plate 10, so that the cover plate 10 is more balanced in stress and avoids defects such as warping or cracking of the cover plate 10 due to uneven stress.

[0185] Specifically in the embodiment, the second insulating portion 22 is recessed into the first groove 323 to form a fourth groove 225. That is to say, the second insulating portion 22 covers the inner wall of the first groove 323 and does not fill the entire first groove 323. On the one hand, it is beneficial to improve the bonding force between the second insulating portion 22 and the second connecting portion 32 of the pole 30 and avoid the separation or misalignment between the second insulating portion 22 and the second connecting portion 32; on the other hand, it reduces the material consumption of the second insulating portion 22 and avoids defects such as uneven injection molding due to local excessive thickness.

[0186] Specifically in the embodiment, on the side of the first connecting portion 31 opposite to the first surface b1, there are a boss 311 and an annular surface 312. 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 on the boss 311, and the second insulating portion 22 of the first insulating member 20 is lower than the annular surface 312 or flush with the annular surface 312. In this way, by providing the boss 311, it can prevent the injection molding material from flowing onto the boss 311 during injection molding, resulting in the first insulating member 20 covering the surface of the boss 311.

[0187] In this embodiment, the protruding height H1 of the boss 311 relative to the annular surface 312 is 0.05 mm to 0.8 mm, and H1 can be in multiple ranges such as 0.1 mm to 0.6 mm or 0.3 mm to 0.5 mm, etc. It should be noted that H1 can be 0.05 mm, 0.20 mm, 0.35 mm, 0.50 mm, 0.65 mm, 0.8 mm, etc., and no special limitation is made here.

[0188] Specifically in the embodiment, the top cover assembly 100 further includes a sealing ring 40, and the sealing ring 40 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 - portion 324, and the first sealing portion 41 is located between the inner wall of the first through - hole 11 and the connecting sub - portion 324, and the second sealing portion 43 is located between the surface of the cover plate 10 facing away from the battery cell assembly 300 and the second area 322. In this way, on the one hand, the sealing ring 40 is used to seal the first through - hole 11 on the cover plate 10 to prevent the electrolyte in the housing 200 from leaking out through the first through - hole 11; on the other hand, the sealing ring 40 is used to form insulation between the connecting sub - portion 324 and the second area 322 and the cover plate 10 to prevent the pole 30 from being electrically conducted to the cover plate 10.

[0189] Specifically in the embodiment, please refer to Figure 5 , the second area 322 includes a first straight portion a1, a first arc portion a2, a second straight portion a3, and a second arc portion a4 that are connected end - to - end in sequence. The first straight portion a1 and the second straight portion a3 are respectively located on both sides of the first area 321 in the first preset direction X, and the first arc portion a2 and the second arc portion a4 are respectively located on both sides of the first area 321 in the second preset direction Y. The curvature radius R of the outer edge of the first arc portion a2 and the outer edge of the second arc portion a4 is 3 mm to 8 mm, and R can be in multiple ranges such as 4 mm to 6 mm, 3 mm to 5 mm, and 5 mm to 8 mm, etc., and can be specifically selected according to the actual situation. In this way, the curvature radius R of the outer edge of the first arc portion a2 and the outer edge of the second arc portion a4 is set within a suitable range. On the one hand, it is to prevent the flanging portion 12 from not being able to be folded onto the second insulating portion 22 due to R being too small; on the other hand, it is to prevent the area of the arc region of the second area 322 from being too large due to R being too large, thereby avoiding waste of the pole 30 material.

[0190] It should be noted that R can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc., and no limitation is made here.

[0191] Specifically in the embodiment, on a virtual plane perpendicular to the thickness direction of the terminal post 30, the orthographic projection of the first connecting portion 31 does not overlap with the orthographic projections of the respective second connecting portions 32. That is to say, the respective second connecting portions 32 and the first connecting portion 31 are completely staggered in the thickness direction Z of the terminal post 30, so that the position where the first connecting portion 31 is welded to the electrical connector is far enough away from the respective second connecting portions 32. Furthermore, when the electrical connector is welded to the third surface b3 of the first connecting portion 31, the adverse effect of the heat generated by the welding on the first insulating member 20 and the sealing ring 40 is greatly reduced, which is beneficial to reducing the risk of cracking or melting of the first insulating member 20 and improving the sealing reliability of the sealing ring 40.

[0192] It should also be noted that the assembly method of the top cover assembly 100 can be the pre-injection molding method and the integral injection molding method. Please refer to Figure 11 and Figure 12 , the pre-injection molding method means that: First, the terminal post 30 is formed by a stamping process; then, the first insulating member 20 is injection molded on the terminal post 30 so that the terminal post 30 and the first insulating member 20 form an integral body; then the sealing ring 40 is sleeved on the connecting sub-portion 324 of the terminal post 30, and the connecting sub-portion 324 of the terminal post 30 is inserted into the first through hole 11 on the cover plate 10; then, the flanging portion 12 is flanged so that a part of the flanging portion 12 is bent onto the second insulating portion 22 of the first insulating member 20, thereby pressing the terminal post 30 and the first insulating member 20 on the cover plate 10, and at the same time compressing the sealing ring 40 so that the sealing ring 40 seals the first through hole 11.

[0193] In the pre-injection molding method, since the flanging portion 12 is flanged to the folded state after the first insulating member 20 is injection molded, the second insulating portion 22 of the injection molded first insulating member 20 does not cover the flanging portion 12.

[0194] Please refer to Figure 7 and Figure 9As shown in the figure, the one-piece injection molding method means: First, the terminal post 30 is formed by stamping process; Then, the sealing ring 40 is sleeved on the connecting sub-part 324 of the terminal post 30, and the connecting sub-part 324 is inserted into the first through hole 11 on the cover plate 10; Then, the terminal post 30, the sealing ring 40 and the cover plate 10 are assembled as a whole into an injection mold for injection molding, so as to injection mold the first insulating part 20 (the flanging part 12 has been flanged during the injection molding of the first insulating part 20). During the injection molding process of the first insulating part 20, pressure is applied to the terminal post 30, so that the terminal post 30 compresses the sealing ring 40, that is, the sealing ring 40 maintains a certain compression amount; After the injection molding is completed, the cover plate 10, the sealing ring 40, the terminal post 30 and the first insulating part 20 are removed from the injection mold as a whole. At this time, the pressure applied to the terminal post 30 disappears, but due to the pressing action of the flanging part 12 on the first insulating part 20, the terminal post 30 and the first insulating part 20 can be kept tightly pressed on the cover plate 10, and the sealing ring 40 can also be kept in a compressed state.

[0195] In the one-piece injection molding method, since the flanging part 12 has been flanged to the folded state before the injection molding of the first insulating part 20, the second insulating part 22 of the injection molded first insulating part 20 still covers the flanging part 12.

[0196] Considering that the sealing ring 40 is located on the side of the connecting sub-part 324 away from the first connecting part 31 and indirectly bears the pressure from the flanging part 12, while the pressure on the side of the sealing ring 40 close to the first connecting part 31 is relatively small, and this part will push up the second area 322 located on the side of the connecting sub-part 324 close to the first connecting part 31. Therefore, the thickness dimension of the second area 322 located on the side of the connecting sub-part 324 close to the first connecting part 31 is configured to be greater than the thickness dimension of the second area 322 located on the side of the connecting sub-part 324 away from the first connecting part 31. In this way, the thickness of the second area 322 located on the side of the connecting sub-part 324 close to the first connecting part 31 is increased, thereby increasing the structural strength of this part.

[0197] The terminal post 30 can also be installed on the housing 200. The installation of the terminal post 30 on the housing 200 is similar to the structure of the installation on the cover plate 10, so it will not be elaborated here.

[0198] Based on the above terminal post 30, the present application also provides a processing method for the terminal post 30. Please refer to Figure 13 and Figure 14 As shown in the figure, the processing method includes the following steps:

[0199] Step 1: Provide a sheet 101. Specifically, the thickness of the sheet 101 is 2 mm to 8 mm. The thickness of the sheet can be within multiple ranges such as 2 mm to 4 mm, 2 mm to 6 mm, 6 mm to 8 mm, 4 mm to 8 mm, 3 mm to 7 mm, and 4 mm to 6 mm, etc., and can be specifically selected according to actual situations. For example, the thickness of the sheet can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc., and no special limitation is made here. It can be understood that the sheet 101 can be a composite sheet containing a first metal layer A and a second metal layer B, or a sheet only containing the first metal layer A.

[0200] In some embodiments, see Figure 13 and Figure 14 , the sheet 101 can be a partial composite sheet that locally (i.e., the area for forming each second connecting portion 32) contains the first metal layer A and the second metal layer B, and the remaining areas (i.e., the areas for forming the first connecting portion 31 and each transition portion 33) do not contain the second metal layer B.

[0201] In other embodiments, see Figure 15 , the sheet 101 can be such that all areas contain the first metal layer A and the second metal layer B, that is, the areas of the sheet 101 for forming the first connecting portion 31, each transition portion 33, and each second connecting portion 32 all contain the first metal layer A and the second metal layer B.

[0202] Step 2: Perform upsetting and drawing on the sheet 101; by upsetting the sheet 101, a first connecting portion area 102, a plurality of second connecting portion areas 103, and a transition portion area 104 between each second connecting portion area 103 and the first connecting portion area 102 are formed on the sheet 101; by drawing the sheet 101, a first connecting portion 31 is formed in the first connecting portion area 102, a second connecting portion 32 is formed in each second connecting portion area 103, and a transition portion 33 is formed in each transition portion area 104.

[0203] Step 3: Perform blanking on the sheet 101 to obtain the terminal post 30. Specifically, the thickness dimension T9 of the first connecting portion 31 is 2 mm to 8 mm, the thickness dimension T14 of the annular side wall 3245 of each connecting sub-portion 324 is greater than or equal to 0.5 mm, the thickness dimension T12 of the bottom wall 3247 is greater than or equal to 1.2 mm, and T9≥T12>T14 is satisfied.

[0204] In this way, compared with the prior art that uses a material-removing cutting process, in this application, the sheet 101 is processed into the terminal post 30 through stamping processes such as upsetting, drawing, and blanking. On the one hand, it is more suitable for mass production, with lower production costs and faster production efficiency; on the other hand, it greatly saves the terminal post material and reduces the material cost.

[0205] It should be noted that in the second step, the number of upsetting operations is not limited to one, and the number of drawing operations is not limited to one either. That is, the sheet 101 can be upset and drawn multiple times. Specifically, Figure 13 and Figure 14 in the embodiment shown in FIG., the sheet 101 is upset once and drawn three times in the second step. Of course, the sheet 101 can also be blanked in the second step to form holes such as the second through hole 330 on the pole 30. In addition, processes such as upsetting, drawing, and blanking can also be carried out simultaneously.

[0206] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0207] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A terminal post, characterized in that, It includes at least one first connecting part (31) and at least two second connecting parts (32). The at least two second connecting parts (32) are arranged at intervals along a first preset direction (X). One first connecting part (31) is arranged between every two adjacent second connecting parts (32). Each first connecting part (31) is connected to two adjacent second connecting parts (32); the first connecting part (31) is used for connecting with an electrical connector, and one side surface of the first connecting part (31) in the pole post thickness direction (Z) is a first surface (b1); each of the second connecting parts (32) protrudes from the first surface (b1) of the first connecting part (31) along the pole post thickness direction (Z), and the second connecting part (32) is used for connecting with a tab. One side of each second connecting part (32) in the pole post thickness direction (Z) has a second surface (b2). The second surface (b2) and the first surface (b1) are on the same side of the pole post (30) in the thickness direction (Z). The first connecting part (31) also has a third surface (b3) opposite to the first surface (b1); each second connecting part (32) also has a fourth surface (b4) opposite to the second surface (b2). In the pole post thickness direction (Z), the fourth surface (b4) is located between the first surface (b1) and the third surface (b3).

2. The terminal post according to claim 1, wherein On a virtual plane perpendicular to the pole post thickness direction (Z), the orthographic projection of the first connecting part (31) does not overlap with the orthographic projections of the second connecting parts.

3. The terminal post according to claim 1, wherein, The first connecting part (31) and each of the second connecting parts (32) are integrally formed.

4. The terminal post according to claim 3, wherein, The first connecting part (31) and each of the second connecting parts (32) are a stamping integral forming structure.

5. The terminal post according to claim 1, characterized in that, The second connecting part (32) is provided with two. The two second connecting parts (32) are respectively connected to both sides of the first connecting part (31) in the first preset direction (X).

6. The terminal post 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 20 mm - 70 mm.

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

8. The terminal post according to claim 1, characterized in that, The second surface (b2) protrudes from the first surface (b1) of the first connecting part (31) in the pole post thickness direction (Z).

9. The terminal post according to claim 8, wherein Each second connecting part (32) includes a first area (321) and a second area (322) surrounding the first area (321). The second area (322) is connected to the first connecting part (31). The first area (321) protrudes relative to the second area (322) along the pole post thickness direction (Z) to form a connecting sub - part (324). One side surface of the second region (322) facing away from the connecting portion (324) in the pole post thickness direction (Z) is the fourth surface (b4), and one side surface of the connecting portion (324) facing away from the second region (322) in the pole post thickness direction (Z) is the second surface (b2).

10. The terminal post according to claim 9, characterized in that, The second region (322) has a fifth surface (b5) facing away from the fourth surface (b4), and the fifth surface (b5) protrudes from the first surface (b1) of the first connecting portion (31) in the pole post thickness direction (Z).

11. The terminal post according to claim 9, wherein, A protrusion (34) is provided on the second surface (b2) of the connecting portion (324).

12. The terminal post according to claim 9, wherein, The connecting portion (324) has a first groove (323), and the notch of the first groove (323) penetrates one end of the connecting portion (324) facing away from the second surface (b2).

13. The terminal post according to claim 12, wherein In the pole post thickness direction (Z), the bottom of the first groove (323) is located on the side of the first surface (b1) away from the third surface (b3).

14. The terminal post according to claim 12, wherein, The depth dimension D2 of the first groove (323) is 1 mm to 5 mm; and / or The width dimension W4 of the notch of the first groove (323) in the first preset direction (X) is 4 mm to 25 mm, the width dimension W5 of the bottom of the first groove (323) in the first preset direction (X) is 2 mm to 20 mm, and W5 < W4.

15. The terminal post according to claim 12, wherein The connecting 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 decreases step by step.

16. The terminal post according to claim 15, characterized in that, The angle between the inner surface of the annular side wall (3245) and a virtual axis (C) is α, the virtual axis (C) is parallel to the pole post thickness direction (Z), and the angle between the outer surface of the annular side wall (3245) and the virtual axis (C) is β; α is 5° to 60° and / or β is 5° to 60°.

17. The terminal post according to claim 16, wherein α=β。 18. The terminal post according to claim 15, 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.

19. The terminal post according to claim 18, wherein T12 and T11 satisfy: T12 - T11 = 0 to 2 / 3 × T11.

20. The terminal post according to claim 9, wherein The second region (322) includes a first straight portion (a1), a first arc portion (a2), a second straight portion (a3), and a second arc portion (a4) that are connected end to end in sequence. The first straight portion (a1) and the second straight portion (a3) are respectively located on both sides of the first region (321) in the first preset direction (X). The first arc portion (a2) and the second arc portion (a4) are respectively located on both sides of the first region (321) in the second preset direction (Y). The first preset direction (X), the second preset direction (Y), and the pole post thickness direction (Z) are perpendicular to each other in pairs.

21. The terminal post according to claim 20, wherein, The curvature radii R of the outer edges of the first arc portion (a2) and the second arc portion (a4) are 3 mm to 8 mm.

22. The terminal post according to claim 1, wherein On the side of the first connecting portion (31) opposite to the first surface (b1), there are a boss (311) and an annular surface (312); the annular surface (312) is arranged around the boss (311), and the boss (311) protrudes in a direction away from the first surface (b1) relative to the annular surface (312).

23. The terminal post according to claim 22, wherein, The protruding height H1 of the boss (311) relative to the annular surface (312) is 0.05 mm to 0.8 mm.

24. The terminal post according to claim 1, characterized in that, A second groove (315) is formed on the first surface (b1) of the first connecting portion (31), and at least part of the second groove (315) gradually narrows or narrows in a stepped manner in the direction from the groove bottom to the groove opening.

25. The terminal post according to claim 24, wherein The depth dimension of the second groove (315) is H2, and the thickness dimension of the first connecting portion (31) is T9. H2 and T9 satisfy: H2 = (5% - 50%)T9.

26. The terminal post according to claim 9, wherein, The pole post (30) further includes a transition portion (33), and each second connecting portion (32) is connected to the corresponding first connecting portion (31) through the transition portion (33); One end of the transition portion (33) connected to the second connecting portion (32) is the first end, and the first end at least partially protrudes from the side of the first connecting portion (31) having the first surface (b1) along the pole post thickness direction (Z).

27. The terminal post according to claim 26, wherein The current-carrying area of the transition portion (33) is smaller than the current-carrying area of the first connecting portion (31) and smaller than the current-carrying area of the second connecting portion (32).

28. The terminal post according to claim 26, wherein The thickness dimension of the first connecting portion (31) is T9, the thickness dimension of the transition portion (33) is T13, and the thickness dimension of the second region (322) is T11, and T9 ≥ T11 > T13.

29. The terminal post according to claim 28, wherein, The connecting part (324) has a first groove (323), and the notch of the first groove (323) penetrates through one end of the connecting part (324) facing away from the second surface (b2); the connecting part (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) 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.

30. The terminal post according to claim 26, wherein, The terminal post (30) includes a first metal layer (A) and a second metal layer (B), and the first metal layer (A) extends to the first connecting part (31) and each of the second connecting parts (32); at each of the second connecting parts (32), the second metal layer (B) and the first metal layer (A) are stacked along the thickness direction (Z) of the terminal post, and one side surface of the first metal layer (A) facing away from the second metal layer (B) includes the fourth surface (b4), and one side surface of the second metal layer (B) facing away from the first metal layer (A) is the sixth surface (b6), and the sixth surface (b6) includes the second surface (b2).

31. The terminal post according to claim 30, wherein The transition part (33) has a seventh surface (b7), the seventh surface (b7) and the sixth surface (b6) are on the same side of the terminal post (30) in the thickness direction (Z), and the seventh surface (b7) and the sixth surface (b6) are arc-transitioned through an arc segment (332); One end of the second metal layer (B) close to the first connecting part (31) has a first interface (D), and there is a preset distance L between the first interface (D) and the arc segment (332).

32. The terminal post according to claim 31, wherein The preset distance L satisfies: 0.5mm≤L≤6mm.

33. The terminal post according to claim 30, characterized in that, The connecting part (324) has a first groove (323), and the notch of the first groove (323) penetrates through one end of the connecting part (324) facing away from the second surface (b2); the connecting part (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) 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.

34. The terminal post according to claim 33, wherein, The thickness T5 of the second metal layer (B) at the bottom wall (3247) is 0.3 mm to 1.8 mm; and / or the thickness T5 of the second metal layer (B) at the bottom wall (3247) accounts for 10% to 40% of the thickness of the bottom wall (3247).

35. The terminal post according to claim 33, characterized in that, The thickness T3 of the second metal layer (B) at the second region (322) is 0.05 mm to 1.5 mm; and / or the thickness T3 of the second metal layer (B) at the second region (322) accounts for 10% to 40% of the thickness of the second region (322).

36. The terminal post according to claim 30, wherein At the second region (322), a second interface (E) is formed between the first metal layer (A) and the second metal layer (B); In the thickness direction (Z) of the pole, the second interface (E) protrudes from the first surface (b1) of the first connecting portion (31).

37. The terminal post according to claim 30, wherein, The second metal layer (B) extends to each of the transition portions (33) and the first connecting portion (31).

38. The terminal post according to claim 37, 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 portion (33) is T8, and the thickness of the second metal layer (B) at the first connection portion (31) is T2; T3, T8 and T2 satisfy: T8<T3≤T2.

39. The terminal post according to claim 38, wherein The connecting sub-portion (324) has a first groove (323), and the notch of the first groove (323) passes through one end of the connecting sub-portion (324) away from the second surface (b2); the connecting sub-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 area (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); 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 side wall (3245) is T7, and T7<T8<T3≤T5≤T2.

40. The terminal post according to claim 39, characterized in that, T5, T3 and T2 satisfy: T5-T3=0~0.5×T2.

41. The terminal post according to any one of claims 30 to 40, characterized in that, The first metal layer (A) is an aluminum layer, and the second metal layer (B) is a copper layer.

42. A top cover assembly, characterized in that, It comprises a cover plate (10) and a pole (30) according to any one of claims 1 to 41; The cover plate (10) is provided with a first through hole, the first connection portion (31) is arranged on one side of the cover plate (10), a first surface (b1) of the first connection portion (31) faces the cover plate (10), and the second connection portion (32) passes through the first through hole to the other side of the cover plate (10).

43. A battery cell, characterized in that, It comprises a housing, a battery cell assembly and a top cover assembly (100) as claimed in claim 42; The housing is open at least at one end. The battery cell assembly is received in 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 groups of battery cells arranged in parallel along the thickness direction of the housing, and at least two groups of the battery cells are arranged in one-to-one correspondence with at least two of the second connection parts. The end face of each group of battery cells extends out a tab, and the tabs of each group of battery cells are respectively connected to the corresponding second connection part.

44. A battery cell, characterized in that: It includes a housing, a battery cell assembly, and a pole column (30) according to any one of claims 1 to 38. The pole column is provided on the housing, and the battery cell assembly is received in the housing.

45. A battery, characterized in that, It includes a plurality of battery monomers according to claim 44 or 43. The plurality of battery monomers are electrically connected through an electrical connection member, and the electrical connection member is connected to the first connection part.

46. An electrical device, characterized in that, It includes a battery monomer according to claim 44 or 43, or includes a battery according to claim 45.

47. A processing method for preparing a terminal post as described in any one of claims 1 to 41, characterized in that, It includes the following steps: Provide a sheet material (101); Perform upsetting and drawing on the sheet material (101). By upsetting the sheet material (101), a first connection part area (102) and a plurality of second connection part areas (103) are formed on the sheet material (101). By drawing the sheet material (101), the first connection part (31) is formed in the first connection part area (102), and the second connection part (32) is formed in each second connection part area (103); Perform blanking on the sheet material (101) to obtain the pole column (30).

48. The processing method of the terminal post according to claim 47, characterized in that, In the step of providing a sheet material (101): The thickness of the sheet material (101) is 2 mm to 8 mm; In the pole column (30) obtained by performing the step of blanking on the sheet material (101): The thickness dimension T9 of the first connection part is 2 mm to 8 mm, the thickness dimension T14 of the annular side wall (3245) of each second connection part (32) is greater than or equal to 0.5 mm, and the thickness dimension T12 of the bottom wall (3247) is greater than or equal to 1.2 mm.

Images