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

Abstract

The utility model relates to a pole, a top cover assembly, a battery monomer, a battery and an electric device. The pole comprises a first connecting part and at least two second connecting parts, the second connecting parts are arranged at intervals in the first preset direction and located on the same side of the first connecting part in the second preset direction, and the second preset direction is perpendicular to the first preset direction; each second connecting part is connected with the first connecting part; the first connecting part is used for being connected with an electric connecting piece, and each second connecting part is used for being electrically connected with a tab.

Description

Technical Field

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

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

[0003] In a single battery cell, the limited space on the top cover, especially for narrower top covers, necessitates the use of smaller terminals. This smaller terminal size results in higher resistance and weaker current-carrying capacity, severely limiting the current-carrying ability of the battery cell. Utility Model Content

[0004] Therefore, it is necessary to provide an electrode post, top cover assembly, battery cell, battery, and power device that can improve the current carrying capacity in order to address the above problems.

[0005] On one hand, this application provides an electrode post, including a first connecting portion and at least two second connecting portions, each of the second connecting portions being spaced apart along a first preset direction and located on the same side of the first connecting portion in a second preset direction, the second preset direction being perpendicular to the first preset direction; each of the second connecting portions being connected to the first connecting portion; the first connecting portion being used to connect to an electrical connector, and each of the second connecting portions being used to be electrically connected to an electrode tab respectively.

[0006] In some embodiments, the first connecting portion has a first surface as one side surface in the pole post thickness direction, each second connecting portion protrudes at least partially from the first surface along the pole post thickness direction, and the portion of each second connecting portion protruding from the first surface is used to connect with the electrode tab; the pole post thickness direction is perpendicular to both the first preset direction and the second preset direction.

[0007] In some embodiments, the first connecting portion further has a second surface opposite to the first surface, the second surface protruding from each of the second connecting portions along the thickness direction of the pole post.

[0008] In some embodiments, each of the second connecting portions includes a first connecting sub-portion and a second connecting sub-portion, the first connecting sub-portion being connected to the first connecting portion, the first connecting sub-portion being disposed around a first end of the second connecting sub-portion and connected to the first end of the second connecting sub-portion, and the second end of the second connecting sub-portion being disposed protruding from the first surface relative to the first connecting sub-portion along the thickness direction of the pole post.

[0009] In some embodiments, the first end of the second connecting sub-part has a first groove.

[0010] In some embodiments, the pole post further includes a transition portion connected to the first connecting portion and each of the second connecting portions.

[0011] In some embodiments, the transition portion includes a first transition sub-portion, which is located between the first connecting portion and each of the second connecting portions in the second preset direction.

[0012] In some embodiments, the transition portion further includes a second transition sub-portion connected to the first transition sub-portion and each of the second connecting portions, and extending along the edge of the second connecting portion.

[0013] In some embodiments, the length of the first transition sub-part from the end connected to the first connecting part to the end connected to the second connecting part is 3mm to 6mm; and / or,

[0014] The size of the first transition sub-part in the first preset direction is smaller than the size of the first connecting part in the first preset direction.

[0015] In some embodiments, the first transition sub-part has a third end and a fourth end opposite to the third end, the third end being connected to the first connecting part and the fourth end being connected to the second connecting part;

[0016] The first transition sub-part extends obliquely from the third end to the fourth end relative to the thickness direction of the pole post, so that the fourth end protrudes from the first surface of the first connecting part in the thickness direction of the pole post.

[0017] In some embodiments, the angle α between the extension direction of the first transition sub-section from the third end to the fourth end and the thickness direction of the pole post is 15° to 60°.

[0018] In some embodiments, the flow area of ​​the first transition sub-part is smaller than the flow area of ​​the first connection part, and the flow area of ​​the first transition sub-part is smaller than the flow area of ​​the second connection part.

[0019] In some embodiments, the flow area of ​​the first transition sub-section is 7.5 mm. 2 ~20mm 2 .

[0020] In some embodiments, the first transition sub-part has a second through hole.

[0021] In some embodiments, the pole post further includes a connecting portion connecting two adjacent second connecting portions.

[0022] In some embodiments, the connecting portion is located on the side of the transition portion away from the first connecting portion and is spaced apart from the transition portion.

[0023] In some embodiments, the connecting portion is located on the side of the transition portion away from the first connecting portion, and the side of the connecting portion away from the transition portion has a third surface, the third surface being recessed toward the transition portion relative to two adjacent second connecting portions.

[0024] In some embodiments, the first connecting portion further has a second groove formed on the first surface, the second groove being at least partially narrowed or stepped from the bottom to the opening.

[0025] In some embodiments, there are two second connecting portions, and the distance between the two second connecting portions is 5mm to 15mm.

[0026] A top cover assembly includes a cover plate, a first insulating element, and an electrode post as described in any of the above embodiments;

[0027] The cover plate has a first side, a second side, and a first through hole. The first side and the second side are opposite to each other, and the first through hole passes through the first side and the second side. The first connecting part is disposed on the first side of the cover plate. The first preset direction is parallel to the width direction of the cover plate. Each second connecting part passes through the corresponding first through hole. The first insulating member includes a first insulating part that forms insulation between the cover plate and the first connecting part.

[0028] In some embodiments, the first insulating member further includes a second insulating portion that at least partially covers the second connecting portion;

[0029] The top cover assembly also includes a flanged portion connected to the first side of the cover plate and bent to abut against the side of the second insulating portion opposite to the cover plate.

[0030] In some embodiments, the flanged portion extends along the peripheral edge of the second connecting portion.

[0031] In some embodiments, the distance between the flange and the edge of the cover plate is greater than or equal to 2.5 mm.

[0032] In some embodiments, the first connecting portion has a first surface and a second groove, the first surface facing the cover plate, the second groove being formed on the first surface, and a portion of the first insulating portion filling the second groove; and / or

[0033] The cover plate has a third groove in the area covered by the first insulating part, and a portion of the first insulating part fills the third groove.

[0034] In some embodiments, the second groove is at least partially narrowed or stepped in the direction from the bottom to the opening.

[0035] In some embodiments, the third groove is at least partially narrowed or stepped in the direction from the bottom of the groove to the opening.

[0036] In some embodiments, the first side of the cover plate has a fourth groove, the first connecting portion is disposed in the fourth groove, and the first insulating portion is disposed between the first connecting portion and the inner wall of the fourth groove.

[0037] In some embodiments, the first insulating portion includes a first insulator portion and a second insulator portion, the first insulator portion being located between the first connecting portion and the bottom wall of the fourth groove, and the second insulator portion being located between the periphery of the first connecting portion and the side wall of the fourth groove, and being disposed around the first connecting portion;

[0038] The top cover assembly also includes a welded component welded to the first side of the cover plate, a portion of which presses against the side of the second insulator portion away from the bottom wall of the fourth groove.

[0039] In some embodiments, the weldment extends along the peripheral edge of the fourth groove.

[0040] In some embodiments, the first side of the cover plate also has a fifth groove, each of the second connecting portions is located in the fifth groove, and each of the first through holes is formed in the fifth groove.

[0041] In some embodiments, each of the second connecting portions has a first groove on the side away from the cover plate, and the first insulating member further includes a second insulating portion covering each of the second connecting portions, the second insulating portion being recessed into the first groove in the area corresponding to the first groove to form a first pit.

[0042] In some embodiments, the top cover assembly further includes at least two sealing rings, each of the second connecting portions includes a first connecting sub-port and a second connecting sub-port, and each sealing ring includes a first sealing portion and a second sealing portion both sleeved on the corresponding second connecting sub-port, the first sealing portion being located between the second connecting sub-port and the inner wall of the first through hole, and the second sealing portion being located between the first side of the cover plate and the first connecting sub-port.

[0043] In some embodiments, the dimension of the first connecting portion along the first preset direction is L1, the dimension of the cover plate along the first preset direction is L2, and L1 / L2≥1 / 2.

[0044] In some embodiments, there are two poles, both of which are disposed on the cover plate and located at both ends of the cover plate in the length direction. The second connecting portions of each pole are spaced apart along the width direction of the cover plate, and the width direction of the cover plate is consistent with the first preset direction.

[0045] In either of the two pole posts, each of the second connecting portions is located on the side of the first connecting portion that is closer to or farther away from the other pole post.

[0046] On the other hand, this application provides a battery cell, including a housing, a cell assembly, and a top cover assembly as described in any of the above embodiments;

[0047] The housing has a receiving cavity and an opening communicating with the receiving cavity. A cover plate is provided on the opening, and the second side of the cover plate faces the receiving cavity. The battery cell assembly is disposed in the receiving cavity and has at least two tabs on the side facing the cover plate. Each second connection portion is connected to the corresponding tab by the portion of the first through hole that extends into the receiving cavity.

[0048] On the other hand, this application provides a battery including a battery cell as described in any of the above embodiments.

[0049] On the other hand, this application provides an electrical device that includes a battery cell as described in any of the above embodiments, or includes a battery as described in any of the above embodiments.

[0050] Compared with the prior art, this application has the following beneficial effects:

[0051] The aforementioned terminal post, top cover assembly, battery cell, battery, and power device, wherein the terminal post has two second connecting parts arranged along the arrangement direction of the two sets of battery cells, so that the two second connecting parts pass through the first through hole on the cover plate and are directly connected to the tabs of the two sets of battery cells respectively. Furthermore, the two second connecting parts are arranged on the same side of the first connecting part in the second preset direction, so that the first connecting part does not need to occupy the space between the two second connecting parts, and the two second connecting parts can be brought as close to each other as possible. This results in a smaller size of the terminal post in the first preset direction, greatly reducing the space required in the width direction (i.e., the first preset direction) of the cover plate. Without reducing the size of the terminal post, it can accommodate battery cells with narrower cover plates, which is beneficial for improving the current carrying capacity of the battery cell. Attached Figure Description

[0052] Figure 1 This is a cross-sectional view of a single battery cell in one embodiment of this application;

[0053] Figure 2 for Figure 1 A schematic diagram of the top cover assembly of the battery cell shown;

[0054] Figure 3 for Figure 1 The image shows a partial enlarged view of the top cover assembly at one of the poles;

[0055] Figure 4 for Figure 3 The diagram shows an exploded view of the top cover assembly at one of the poles.

[0056] Figure 5 for Figure 3 The top cover assembly shown is a cross-sectional view along BB;

[0057] Figure 6 for Figure 3 The top cover assembly shown is a cross-sectional view along AA;

[0058] Figure 7 for Figure 3 The top cover assembly shown is a cross-sectional view along the CC direction;

[0059] Figure 8 for Figure 3 A top view of the pole of the top cover assembly shown;

[0060] Figure 9 for Figure 3 A bottom view of the pole of the top cover assembly shown;

[0061] Figure 10 for Figure 3 Side view of the pole of the top cover assembly shown;

[0062] Figure 11 for Figure 3 A top view of the first insulating element of the top cover assembly shown;

[0063] Figure 12 This is a schematic diagram of the top cover assembly in another embodiment of this application;

[0064] Figure 13 for Figure 12 The image shows a partial enlarged view of the top cover assembly at one of the poles;

[0065] Figure 14 for Figure 13 The top cover assembly shown is a cross-sectional view along DD;

[0066] Figure 15 This is a cross-sectional view of the top cover assembly in another embodiment of this application (the cross-section is located at the two second connecting portions and is perpendicular to the length direction of the cover plate). Detailed Implementation

[0067] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0068] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0073] One embodiment of this application provides an electrical device, a battery, and a battery cell. The electrical device includes a battery or a battery cell and is capable of providing electrical energy from the battery or battery cell. The electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc.

[0074] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. For new energy vehicles, the aforementioned battery can serve as a driving power source, thereby replacing fossil fuels to provide propulsion. This application does not impose any special restrictions on the aforementioned electrical devices.

[0075] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then these battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0076] Multiple battery cells can be mounted on supporting structures such as housings, frames, and brackets. Electrical connections between battery cells and between battery cells and the battery management system can be established via electrical connectors, which can be busbars. Alternatively, battery cells can be electrically connected via their respective terminals. For example, between two adjacent battery cells, one battery cell has a slot on its terminal, and the other battery cell has a corresponding insert on its terminal. The insert is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the terminal of another battery cell. Similarly, battery cells and the battery management system can also be electrically connected via mutual insertion, which will not be elaborated further here. The aforementioned battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries, and their external contours can be cylindrical, flat, cuboid, or other shapes, but are not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0077] See Figure 1 The aforementioned battery cell 1 includes a housing 100, a top cover assembly 200, and a cell assembly 300. The housing 100 has an opening at at least one end and a receiving cavity communicating with the opening. The cell assembly 300 is housed within the receiving cavity of the housing 100. Since the battery cell 1 in this embodiment is a prismatic battery, the outer contour of the housing 100 is cuboid, and its opening is rectangular. The top cover assembly 200 is mounted on the housing 100 and covers the opening of the housing 100, thereby enclosing the cell assembly 300 within the housing 100. Because the shape of the top cover assembly 200 needs to match the shape of the opening of the housing 100, the top cover assembly 200 is approximately rectangular.

[0078] The cell assembly 300 is the core component of the battery cell 1. To fit the shape of the casing 100, the cell assembly 300 in this embodiment is rectangular. The cell assembly 300 includes at least two groups of cells 301 arranged side-by-side along a first preset direction X. Each group of cells 301 extends a tab 302 from its end face facing the top cover assembly 200. Each group of cells 301 may contain one or more cells 301. The cell 301 can be formed by winding or stacking a positive electrode, a negative electrode, and a separator that acts as an insulator between the negative and positive electrodes. The wound cell 301 can be pressed into a flat shape. The tabs 302 of each cell 301 are divided into a positive tab (not shown) and a negative tab (not shown), which are led out from the positive and negative electrodes, respectively.

[0079] In this embodiment, the positive and negative tabs can be located at the same end of the battery cell 301, or the positive tab can be located at one end of the battery cell 301 and the negative tab at the opposite end of the battery cell 301. Specifically, in this embodiment, the battery cell assembly 300 includes two sets of battery cells 301, each set of battery cells 301 including one battery cell 301. The positive and negative tabs of each battery cell 301 are located at the same end of the battery cell 301 and are spaced apart along a second preset direction Y. Therefore, one end of the battery cell assembly 300 has a total of four sets of tabs 302, of which two sets are negative tabs spaced apart along a first preset direction X, and the other two sets are positive tabs spaced apart along the first preset direction X. The two sets of negative tabs and the two sets of positive tabs are spaced apart along the second preset direction Y. When each set of battery cells 301 includes multiple battery cells 301, the positive tabs of the multiple battery cells 301 are joined together to form a set of positive tabs, and the negative tabs are joined together to form a set of negative tabs.

[0080] Before the battery cell assembly 300 is installed into the housing 100, it needs to be assembled with the top cover assembly 200. Specifically, the tabs 302 of the battery cell assembly 300 need to be electrically connected to the terminals 20 on the top cover assembly 200 (see...). Figure 2 Then, the battery cell assembly 300 is installed into the housing 100, so that the operation is not limited by the small space inside the housing 100.

[0081] The specific structure of the top cover assembly 200 is described in detail below with reference to the accompanying drawings. Please refer to... Figures 2 to 6 The top cover assembly 200 includes a cover plate 10 and a pole post 20. The cover plate 10 is disposed over the opening of the housing 100 to seal the opening of the housing 100. The cover plate 10 may be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. Specifically, in this embodiment, the cover plate 10 is generally rectangular to match the shape of the opening of the housing 100.

[0082] The electrode post 20 is disposed on the cover plate 10. The thickness direction Z of the electrode post 20 is consistent with the thickness direction of the cover plate 10, the first preset direction X is consistent with the width direction of the cover plate 10, and the second preset direction Y is consistent with the length direction of the cover plate 10. Furthermore, the first preset direction X, the second preset direction Y, and the thickness direction Z of the electrode post 20 are perpendicular to each other. In this embodiment, since the positive and negative electrodes of the cell assembly 300 are both located at one end facing the cover plate 10, the cover plate 10 is provided with mutually spaced positive and negative electrodes along its length. The positive electrodes are used to connect to the positive electrodes of each group of cells 301, and the negative electrodes are used to connect to the negative electrodes of each group of cells 301. Of course, if the positive and negative electrodes are located at opposite ends of the cell assembly 300, only one of the positive and negative electrodes needs to be provided on the cover plate 10. The positive terminal serves as the positive terminal of battery cell 1, and the negative terminal serves as the negative terminal of battery cell 1. Electrical connectors are used to connect the positive and negative terminals of each battery cell 1, enabling series, parallel, or mixed connections of the battery cells 1. The electrical connectors can be busbars or terminals 20 of other battery cells 1; no special limitations are specified here.

[0083] Since the positive and negative terminals have similar structures, this article will use one of the terminals 20 as an example for ease of understanding. That is to say, the "terminal" in this article can be either a positive terminal or a negative terminal (unless explicitly stated otherwise), and the "tab" in this article can be either a positive tab or a negative tab (unless explicitly stated otherwise), as long as all tabs 302 connected to the positive terminal are positive tabs and all tabs 302 connected to the negative terminal are negative tabs.

[0084] Specifically, the cover plate 10 has a first side a1, a second side a2, and a first through hole a6. The first side a1 faces away from the cell assembly 300, the second side a2 faces the cell assembly 300, and the first through hole a6 penetrates the first side a1 and the second side a2 of the cover plate 10.

[0085] The pole post 20 includes a first connecting portion 21 and two second connecting portions 23. The first connecting portion 21 is disposed on the first side a1 of the cover plate 10 and connected to the two second connecting portions 23. The two second connecting portions 23 are spaced apart along a first preset direction X and are both located on the same side of the first connecting portion 21 in a second preset direction Y. Each second connecting portion 23 passes through a corresponding first through hole a6 and is connected to its corresponding electrode tab 302, thereby realizing direct electrical connection between the pole post 20 and each set of electrode tabs 302.

[0086] In the aforementioned top cover assembly 200, the electrode post 20 arranges two second connecting portions 23 along the arrangement direction of the two sets of cells 301, so that the two second connecting portions 23 pass through the first through hole a6 on the cover plate 10 and are directly connected to the tabs 302 of the two sets of cells 301 respectively. Furthermore, the two second connecting portions 23 are arranged on the same side of the first connecting portion 21 in the second preset direction Y, so that the first connecting portion 21 does not need to occupy the space between the two second connecting portions 23, and the two second connecting portions 23 can be brought as close to each other as possible, thereby making the size of the electrode post 20 smaller in the first preset direction X, greatly reducing the space required in the width direction (i.e., the first preset direction X) of the cover plate 10, and can accommodate the narrower battery cell 1 of the cover plate 10 without reducing the size of the electrode post 20, which is beneficial to improving the current carrying capacity of the battery cell 1.

[0087] In other words, by optimizing the arrangement of the first connecting part 21 and the two second connecting parts 23 in this embodiment, the size of the electrode post 20 in the width direction of the cover plate 10 is reduced, thus enabling the electrode post 20 to adapt to the cover plate 10 with a smaller width, avoiding the problem of reduced current carrying capacity of the battery cell 1 due to the need to use a smaller electrode post 20.

[0088] It should be noted that the pole post 20 is directly connected to the tabs 302 of the two sets of cells 301 through two second connecting parts 23. On the one hand, this avoids the use of adapter plates, thereby reducing the number of parts in the top cover assembly 200 and reducing one welding process. On the other hand, by arranging the two second connecting parts 23 along the arrangement direction of the two sets of cells 301, the two second connecting parts 23 pass through the cover plate 10 through the first through hole a6 and are respectively connected to the tabs 302 of the two sets of cells 301. This avoids the need to extend the tabs 302, thereby greatly reducing the risk of adverse phenomena such as the tabs 302 being inserted backward into the cell and the tabs 302 being torn.

[0089] It should also be noted that the number of second connecting parts 23 is not limited to two; it can be three or more. The number of second connecting parts 23 is related to the number of groups of battery cells 301. Specifically, if the number of groups of battery cells 301 is N, the number of second connecting parts 23 is also set to N, with the N second connecting parts 23 spaced apart along a first preset direction X. The N second connecting parts 23 are respectively inserted through the first through hole a6 on the cover plate 10 and connected one-to-one with the tabs 302 of each group of battery cells 301. It should be noted that the number of groups of battery cells 301 is not the same as the number of battery cells 301. For example, the battery cell assembly 300 includes four battery cells 301, where two battery cells 301 form a group, and the tabs 302 of these two battery cells 301 are brought together to form a set of tabs 302, which are connected to one second connecting part 23; and the other two battery cells 301 form a group, and the tabs 302 of these other two battery cells 301 are brought together to form a set of tabs 302, which are connected to another second connecting part 23. Thus, there are two groups of battery cells 301, but the number of individual battery cells 301 is four; the two are not the same. For ease of understanding, this article will use the example of a battery cell assembly 300 comprising two groups of battery cells 301, each group comprising one battery cell 301, and a terminal post 20 comprising a first connection part 21 and two second connection parts 23.

[0090] Specifically, in this embodiment, the first through hole a6 on the cover plate 10 can be a single through hole with a large opening range, allowing at least two second connecting parts 23 to pass through together; the first through hole a6 can also be a through hole with a small opening range, allowing only one second connecting part 23 to pass through each first through hole a6. Please refer to... Figure 4 A first through hole a6 is provided on the cover plate 10 at the position corresponding to the two second connecting parts 23, so that the two second connecting parts 23 are respectively inserted into the first through hole a6 corresponding to them, and then respectively connected to the two tabs 302 located on the second side a2 of the cover plate 10.

[0091] As can be seen, the first through hole a6 is a through hole with a small opening range, and the area of ​​the cover plate 10 corresponding to the first connecting part 21 does not need to be opened. Therefore, the opening area on the cover plate 10 can be reduced, thereby avoiding a significant decrease in the structural strength of the cover plate 10 due to the opening.

[0092] by Figure 2 and Figure 4Taking the example shown, the cover plate 10 has four first through holes a6. Two of the first through holes a6 are located at one end of the length direction of the cover plate 10 and are spaced apart along the width direction of the cover plate 10. The other two first through holes a6 are located at the other end of the length direction of the cover plate 10 and are also spaced apart along the width direction of the cover plate 10. In this embodiment, the cover plate 10 has two poles 20, one of which is a positive pole and the other is a negative pole. The two poles 20 are located at both ends of the length direction of the cover plate 10, that is, the two poles 20 are arranged at intervals along the second preset direction Y on the cover plate 10. The two poles 20 have a total of four second connecting parts 23, which are correspondingly inserted into the four first through holes a6 on the cover plate 10.

[0093] In this configuration, the two second connecting portions 23 of each pole post 20 are arranged at intervals along the width direction of the cover plate 10 (i.e., the first preset direction X). In either of the two pole posts 20, the two second connecting portions 23 are located on the side of the first connecting portion 21 that is closer to or farther away from the other pole post 20.

[0094] Preferably, in either of the two poles 20, the two second connecting portions 23 are located on the side of the first connecting portion 21 that is closer to the other pole 20, so that the first connecting portion 21 of each pole 20 is closer to the corresponding end of the cover plate 10 than the second connecting portion 23, thereby ensuring that the second connecting portions 23 of the two poles 20 avoid the rounded corners of the cell 301 (the rounded corners of the cell 301 will not extend into the tabs 302), and ensuring that the second connecting portions 23 and the tabs 302 of the cell 301 are more accurately aligned with each other.

[0095] Please see Figures 3 to 7In the embodiments of this application, the first connecting portion 21 has a first surface 210 and a second surface 211 on its two sides along the thickness direction Z of the electrode post 20, respectively. The first surface 210 faces the cell assembly 300, and the second surface 211 faces away from the cell assembly 300. Each second connecting portion 23 protrudes at least partially from the first surface 210 of the first connecting portion 21 along the thickness direction Z of the electrode post 20, and the portion of each second connecting portion 23 protruding from the first surface 210 passes through the corresponding first through hole a6 and connects to the corresponding tab 302. The second surface 211 of the first connecting portion 21 protrudes from each second connecting portion 23 along the thickness direction Z of the electrode post 20, and the second surface 211 of the first connecting portion 21 is used for connection with an electrical connector. In other words, on the side of the pole post 20 away from the cover plate 10, the first connecting portion 21 protrudes from each of the second connecting portions 23; on the side of the pole post 20 facing the cover plate 10, each of the second connecting portions 23 protrudes from the first connecting portion 21, so that the pole post 20 forms a structure in which each of the second connecting portions 23 is recessed relative to the first connecting portion 21 towards the cover plate 10. This allows the pole post 20 to be manufactured using a stamping process, that is, stamping processes such as upsetting and deep drawing are used to stamp the sheet metal, thereby forming the first connecting portion 21 and each of the second connecting portions 23 recessed relative to the first connecting portion 21 on the sheet metal. Compared with the cutting process used in the prior art that removes material, this greatly reduces the process cost and material cost.

[0096] In this embodiment, the first connecting portion 21 and each of the second connecting portions 23 of the pole post 20 are integrally formed, for example, by stamping. Thus, compared with the cutting process used in the prior art that removes material, using a stamping process to form the pole post 20 is more adaptable to mass production, improving production efficiency and processing costs; on the other hand, it greatly reduces material waste in the pole post 20, lowering its material cost. It should be noted that in other embodiments, the pole post 20 may also employ other integral forming processes, such as die casting or 3D printing, etc., which are not specifically limited here.

[0097] In a specific embodiment, the dimension of the first connecting portion 21 in the first preset direction X is L1, and the dimension of the cover plate 10 in the first preset direction X is L2. Wherein, L1 / L2 ≥ 1 / 2, meaning that the dimension L1 of the first connecting portion 21 in the first preset direction X is greater than or equal to half the dimension L2 of the cover plate 10 in the first preset direction X. This ensures that the dimension of the first connecting portion 21 is large enough, ensuring both a sufficiently large area for connection with the adapter piece and that the current-carrying capacity of the electrode meets the requirements. In this case, the width of the cover plate 10 cannot accommodate the first connecting portion 21 and the second connecting portion 23 side-by-side on the cover plate 10; therefore, the second connecting portion 23 is distributed on the same side of the first connecting portion 21 in the second preset direction Y.

[0098] Please see Figures 7 to 9 In embodiments of this application, each second connecting portion 23 includes a first connecting sub-portion 231 and a second connecting sub-portion 233. The first connecting sub-portion 231 is connected to the first connecting portion 21, and the first connecting sub-portion 231 surrounds the first end c1 of the second connecting sub-portion 233 (see...). Figure 10 The second end c2 of the second connecting sub-part 233 is set and connected to the first end c1 of the second connecting sub-part 233. The second end c2 of the second connecting sub-part 233 (see...) Figure 10 The second connecting portion 233 protrudes from the first surface 210 of the first connecting portion 21 along the thickness direction Z of the pole post 20, relative to the first connecting portion 231. Specifically, during the process of forming the pole post 20 using a stamping process, the area on the sheet metal corresponding to the formation of the second connecting portion 23 includes a first area and a second area surrounding the first area. The first area is drawn once or multiple times using a deep drawing process, so that the first area protrudes relative to the second area along the thickness direction of the sheet metal to form the second connecting portion 233, which is the first connecting portion 231. Thus, the first area can be stretched once or multiple times using a stamping process to form the second connecting portion 233, which passes through the first through hole a6 on the cover plate 10 and is then welded and fixed to the corresponding pole lug 302.

[0099] It should be noted that the tab 302 can be welded to the second end c2 of the second connector 233 using welding processes, such as laser welding, resistance welding, ultrasonic welding, or pressure welding. Alternatively, conductive adhesive can be used to bond and fix the tab 302 to the second end c2 of the second connector 233.

[0100] In this embodiment, the tab 302 is welded and fixed to the second end c2 of the second connecting part 233 by pressure welding. Further, the second end c2 of the second connecting part 233 has a welding surface a9, on which a protrusion (not shown) is provided. During pressure welding, the tab 302 contacts the protrusion on the welding surface a9. Due to the small flow area at the protrusion, the heat generated is large, causing the protrusion on the welding surface a9 to melt and weld the tab 302 to the welding surface a9.

[0101] Furthermore, the first end c1 of the second connecting part 233 has a first groove b1, making the second connecting part 233 hollow, which helps to reduce the weight of the pole post 20 and save the material of the pole post 20. It can be understood that during the process of drawing the sheet metal one or more times using a mold, the first region of the sheet metal bulges outward to one side relative to the second region, thereby forming the hollow second connecting part 233.

[0102] In a specific embodiment, the pole post 20 further includes a transition portion 27, through which the first connecting sub-part 231 of each second connecting portion 23 is connected to the first connecting portion 21. The transition portion 27 includes a first transition sub-part 273 and a second transition sub-part 271. In the second preset direction Y, the first transition sub-part 273 is located between the first connecting portion 21 and each of the second connecting portions 23. The first transition sub-part 273 connects between the first connecting portion 21 and the second transition sub-part 271, and the second transition sub-part 271 connects to the first connecting sub-parts 231 of the two second connecting portions 23 and extends along the edge of the first connecting sub-part 231.

[0103] In this embodiment, the length of the first transition sub-part 273 from the end connected to the first connecting part 21 to the end connected to the second transition sub-part 271 is 3mm to 6mm. This makes the length moderate, on the one hand avoiding excessive resistance due to excessive length, which helps to ensure that the current carrying capacity meets the requirements; on the other hand, avoiding the first connecting part 21 and the second connecting part 23 being too close due to excessive length, which would lead to problems with the flanged part 40 (see Figure 5 When performing the hemming operation, the first connecting part 21 interferes with the hemming equipment.

[0104] Specifically, the length of the first transition sub-part 273 from the end connected to the first connecting part 21 to the end connected to the second transition sub-part 271 can be 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm or 6mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0105] In this embodiment, the size of the first transition sub-part 273 in the first preset direction X is smaller than the size of the first connecting part 21 in the first preset direction X.

[0106] Furthermore, the first transition sub-part 273 has a third end and a fourth end opposite to the third end. The third end is connected to the first connecting part 21, and the fourth end is connected to the second transition sub-part 271. The first transition sub-part 273 extends obliquely from the third end to the fourth end relative to the thickness Z of the pole post 20, so that the fourth end protrudes from the first surface 210 of the first connecting part 21 in the thickness Z of the pole post 20. That is, the first connecting sub-part 231 sinks as a whole relative to the first connecting part 21 toward the cover plate 10, thereby making the second connecting sub-part 233 protrude more than the first connecting part 21. This is beneficial to reduce the drawing depth of the second connecting sub-part 233, reduce the drawing difficulty, and improve the drawing quality of the pole post 20.

[0107] It should be noted that the angle between the extension direction of the first transition sub-part 273 from the third end to the fourth end and the thickness direction of the electrode post 20 is α. If the angle α is too large, the degree of protrusion of each second connecting part 23 relative to the first connecting part 21 is small, thus requiring the area of ​​the cover plate 10 below the first connecting part 21 to be thinned, so that the electrode tab 302 sinks into the housing 100 as a whole, ensuring that the second connecting part 23 can pass through the first through hole a6 on the cover plate 10 and be welded to the corresponding electrode tab 302. However, thinning the area of ​​the cover plate 10 below the first connecting part 21 will cause a sharp decrease in the strength of the cover plate 10, making the cover plate 10 prone to deformation and warping. If the angle α is too small, the degree of protrusion of each second connecting part 23 relative to the first connecting part 21 is large, resulting in a larger dimension of the electrode post 20 in the thickness direction Z, which requires space in the height of the battery cell 1, leading to a decrease in the energy density of the battery cell 1. In this embodiment, the angle α between the extension direction of the first transition sub-part 273 from the third end to the fourth end and the thickness direction Z of the pole post 20 can be 15° to 60°, so that the angle α is moderate, neither too large nor too small, and can avoid the above-mentioned defects caused by the angle α being too large or too small.

[0108] Specifically, the included angle α can be 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° or 60°, etc., including but not limited to the values ​​listed. Other values ​​within the above range are still applicable and are not specifically limited here.

[0109] In a specific embodiment, the first transition sub-section 273 is configured to melt first when the battery cell 1 experiences thermal runaway, meaning the first transition sub-section 273 melts before the first connecting portion 21 and the second connecting portion 23. Specifically, in this embodiment, the flow area of ​​the first transition sub-section 273 is smaller than the flow area of ​​the first connecting portion 21 and smaller than the flow area of ​​the second connecting portion 23. The flow area refers to the minimum area of ​​a cross-section through which fluid passes. Here, the flow area of ​​the first transition sub-section 273 refers to the cross-sectional area of ​​the first transition sub-section 273 perpendicular to the current flow direction, i.e., the minimum cross-sectional area of ​​the first transition sub-section 273. Similarly, the flow areas of the first connecting portion 21 and the second connecting portion 23 refer to the cross-sectional areas of the first connecting portion 21 and the second connecting portion 23 perpendicular to the current flow direction, i.e., the minimum cross-sectional areas of the first connecting portion 21 and the second connecting portion 23. Thus, when a circuit malfunctions during actual use, the first transition sub-section 273 has a small overcurrent area, causing it to heat up quickly. This allows the first transition sub-section 273 to melt rapidly, thereby cutting off the circuit in time and greatly improving battery safety.

[0110] It is understood that the first transition sub-part 273 can reduce its current-carrying area by slotting, opening, and / or thinning, ensuring that it can melt and cut off the circuit in time when the circuit is abnormal. The thinning structure can be a general reduction in the thickness of the first transition sub-part 273, or it can be a groove structure formed in a part of the first transition sub-part 273 and partially thinning the first transition sub-part 273.

[0111] In this embodiment, the flow area of ​​the first transition sub-section 273 can be 7.5 mm. 2 ~20mm 2 Specifically, the flow area of ​​the first transition sub-section 273 can be 7.5 mm². 2 8.0mm 2 8.5mm 2 9.0mm 2 9.5mm 2 10.0mm 2 10.5mm 2 11.0mm 2 11.5mm 2 12.0mm 2 12.5mm 2 13.0mm 2 13.5mm 2 14.0mm 2 14.5mm 2 15.0mm 2 15.5mm 2 16.0mm 2 16.5mm 2 17.0mm 2 17.5mm 2 18.0mm 2 18.5mm 2 19.0mm 2 19.5mm 2 or 20.0mm 2 The values ​​listed above, including but not limited to those listed, are still applicable and are not specifically limited here. If the overcurrent area is too large, the temperature rise of the first transition sub-section 273 will not be significant when the battery malfunctions, and it will not be able to melt in time; if the overcurrent area is too small, it will affect the normal overcurrent of the battery, resulting in a low overcurrent capacity.

[0112] In a specific embodiment, the pole post 20 further includes a connecting portion 25 connecting the first connecting sub-portions 231 of two adjacent second connecting portions 23. The provision of the connecting portion 25 helps to strengthen the strength between the two adjacent second connecting portions 23, thereby improving the overall strength of the pole post 20 and greatly reducing the risk of deformation of the pole post 20.

[0113] Furthermore, the connecting portion 25 is located on the side of the second transition sub-portion 271 of the transition portion 27 away from the first connecting portion 21, and is spaced apart from the second transition sub-portion 271 of the transition portion 27, thereby forming a hollow space 254 between the second transition sub-portion 271 and the connecting portion 25, which helps to reduce the weight of the pole post 20 and reduce the material cost of the pole post 20.

[0114] Furthermore, the connecting portion 25 has a third surface 2521 on the side opposite to the transition portion 27. This third surface 2521 is recessed toward the transition portion 27 relative to the first connecting sub-portions 231 of the two adjacent second connecting portions 23, forming a recessed portion 256. Thus, the provision of the recessed portion 256 helps to reduce the weight of the pole post 20 and reduce the material cost of the pole post 20.

[0115] Please see Figures 5 to 7 and Figure 11 In embodiments of this application, the top cover assembly 200 further includes a first insulating member 30, at least a portion of which forms insulation between the cover plate 10 and the pole post 20. The first insulating member 30 can be injection molded with the pole post 20 first, and then assembled as a whole with the cover plate 10; alternatively, the pole post 20 can be assembled with the cover plate 10 first, and then the first insulating member 30 can be integrally injection molded.

[0116] Specifically, the first insulating member 30 includes a first insulating portion 31 and a second insulating portion 32. The first insulating portion 31 is disposed between the first connecting portion 21 and the cover plate 10 and forms an insulation, thereby preventing the cover plate 10 from becoming energized or short-circuited. The second insulating portion 32 covers the first connecting sub-portions 231 of each second connecting portion 23, providing insulation protection to the surface of the first connecting sub-portions 231 of each second connecting portion 23; on the other hand, it helps to increase the overall strength of the pole post 20 and greatly reduces the risk of deformation of the pole post 20.

[0117] In a specific embodiment, the top cover assembly 200 further includes a flanged portion 40. The flanged portion 40 is connected to the first side a1 of the cover plate 10, and a portion of the flanged portion 40 can be bent to the side surface of the second insulating portion 32 away from the cover plate 10 by a rolling process, thereby using the flanged portion 40 to press the second insulating portion 32 and the second connecting portion 23 of the pole post 20 onto the cover plate 10, preventing the pole post 20 from detaching from the cover plate 10.

[0118] Furthermore, the second insulating portion 32 has a first stepped surface a7 extending along the peripheral edge of the first connecting portion 231. The flange portion 40 extends along the peripheral edge of the first connecting portion 231 and presses against the first stepped surface a7, making the pressing structure of the flange portion 40 against the second insulating portion 32 more stable, thereby making the assembly structure of the pole post 20 and the cover plate 10 more stable and preventing the pole post 20 from shifting position or even detaching from the cover plate 10.

[0119] It should be noted that the edge of the cover plate 10 needs to be welded to the housing 100. Therefore, if the distance between the flange 40 and the edge of the cover plate 10 is too close, the heat generated during welding of the cover plate 10 and the housing 100 will have a thermal impact on the insulating and sealing components (such as the first insulating element 30 and the sealing ring described below) near the flange 40, which may easily lead to insulation and sealing failure. In this embodiment, the distance between the flange 40 and the edge of the cover plate 10 is greater than or equal to 2.5 mm, thereby ensuring that the heat generated during welding of the cover plate 10 and the housing 100 will not have a significant thermal impact on the insulating and sealing components near the flange 40, thus ensuring better insulation and sealing performance.

[0120] Specifically, the distance between the flange 40 and the edge of the cover plate 10 can be 2.50mm, 2.55mm, 2.60mm, 2.65mm, 2.70mm, 2.75mm, 2.80mm, 2.85mm, 2.90mm, 2.95mm or 3.00mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0121] Furthermore, the second insulating portion 32 extends into the first groove b1 of the second connecting portion 233 and covers the inner wall of the first groove b1. In this way, on the one hand, the inner wall of the first groove b1 is insulated and protected, and on the other hand, it helps to improve the bonding force between the second insulating portion 32 and the second connecting portion 23, and prevents the second insulating portion 32 from separating from the second connecting portion 23 or from becoming misaligned.

[0122] Furthermore, the second insulating portion 32 is recessed into the first groove b1 to form a first pit b2. That is, the second insulating portion 32 covers the inner wall of the first groove b1 but does not fill the entire first groove b1. On the one hand, this helps to improve the bonding force between the second insulating portion 32 and the second connecting portion 23, and avoids separation or misalignment between the second insulating portion 32 and the second connecting portion 23; on the other hand, it reduces the amount of material used in the second insulating portion 32 and avoids defects such as uneven injection molding due to excessive local thickness.

[0123] Furthermore, the second insulating portion 32 extends to the first transition sub-portion 273 and the second transition sub-portion 271 of the transition portion 27, thereby providing insulation protection for the first transition sub-portion 273 and the second transition sub-portion 271, and further enhancing the overall strength of the pole post 20.

[0124] Furthermore, the second insulating part 32 extends to the connecting part 25, thereby providing insulation protection for the connecting part 25 and further enhancing the overall strength of the pole post 20.

[0125] Furthermore, the second insulating portion 32 is recessed towards the hollow space 254 to form a second recess b3. On the one hand, this helps to improve the bonding force between the second insulating portion 32 and the second connecting portion 23, preventing the second insulating portion 32 from separating from the second connecting portion 23 or from becoming misaligned; on the other hand, it reduces the amount of material used in the second insulating portion 32 and avoids defects such as uneven injection molding caused by excessive local thickness.

[0126] In a specific embodiment, a second groove 216 is formed on the first surface 210 of the first connecting portion 21, and a portion of the first insulating portion 31 is filled in the second groove 216. Thus, during injection molding of the first insulating part 30, the molten injection material can flow into the second groove 216, and after solidification, form a structure in which the first insulating portion 31 is partially filled in the second groove 216, which helps to improve the bonding force between the first insulating portion 31 and the first connecting portion 21. It should be noted that the number of second grooves 216 can be one or more, and no special limitation is made here.

[0127] In a specific embodiment, a third groove a5 is formed on the surface of the cover plate 10 facing the first insulating part 31, and a portion of the first insulating part 31 is also filled in the third groove a5. Thus, during injection molding of the first insulating part 30, the molten injection material can flow into the third groove a5, and after solidification, form a structure where a portion of the first insulating part 31 is filled in the third groove a5, which helps to improve the bonding force between the first insulating part 31 and the cover plate 10. It should be noted that the number of third grooves a5 can be one or more, and no special limitation is made here.

[0128] Furthermore, at least a portion of the second groove 216 gradually narrows or tapers in a stepped manner in the direction from the bottom of the groove to the opening of the groove, thereby allowing the first insulating part 31 to be tightly nested on the pole post 20 through the second groove 216, preventing the pole post 20 from separating from the first insulating member 30.

[0129] Furthermore, at least a portion of the third groove a5 gradually narrows or tapers in the direction from the bottom of the groove to the opening of the groove, thereby allowing the first insulating part 31 to be tightly nested on the cover plate 10 through the third groove a5, preventing the cover plate 10 from separating from the first insulating member 30.

[0130] In this embodiment, the depth of the second groove 216 is H1, and the thickness of the first connecting portion 21 is H2. H1 and H2 satisfy: H1 = (5%~50%)H2. Thus, by designing the depth of the second groove 216 within a suitable range, it avoids the second groove 216 being too shallow, which would result in an insignificant increase in the bonding force between the first insulating portion 31 and the first connecting portion 21; on the other hand, it avoids the second groove 216 being too deep, which would result in lower strength of the first connecting portion 21 and susceptibility to deformation. It should be noted that H1 can be 5%×H2, 10%×H2, 15%×H2, 20%×H2, 25%×H2, 30%×H2, 35%×H2, 40%×H2, 45%×H2, or 50%×H2, etc., and is not specifically limited here.

[0131] In this embodiment, the depth of the third groove a5 is H3, and the thickness of the cover plate 10 is H4. H3 and H4 satisfy: H3 = (5%~50%)H4. Thus, by designing the depth of the third groove a5 within a suitable range, it avoids both situations where the third groove a5 is too shallow, resulting in an insignificant increase in the bonding force between the first insulating part 31 and the cover plate 10, and where the third groove a5 is too deep, leading to weak strength of the cover plate 10 and easy deformation. It should be noted that H3 can be 5%×H4, 10%×H4, 15%×H4, 20%×H4, 25%×H4, 30%×H4, 35%×H4, 40%×H4, 45%×H4, or 50%×H4, etc., and is not specifically limited here.

[0132] In a specific embodiment, the first side a1 of the cover plate 10 has a fourth groove a3. A first connecting portion 21 is disposed within the fourth groove a3, and a first insulating portion 31 is disposed between the first connecting portion 21 and the inner wall of the fourth groove a3. Thus, the first connecting portion 21 of the pole post 20 is installed using the fourth groove a3, such that an injection molding space for filling the first insulating portion 31 is formed between the first connecting portion 21 and the cover plate 10.

[0133] Optionally, the thickness of the first insulating portion 31 is 0.6 mm to 1.0 mm. Specifically, the thickness of the first insulating portion 31 can be 0.60 mm, 0.65 mm, 0.70 mm, 0.75 mm, 0.80 mm, 0.85 mm, 0.90 mm, 0.95 mm, or 1.00 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.

[0134] Furthermore, the first insulating portion 31 includes a first insulator portion 310 and a second insulator portion 312. The first insulator portion 310 is located between the first connecting portion 21 and the bottom wall of the fourth groove a3. The second insulator portion 312 is located between the periphery of the first connecting portion 21 and the side wall of the fourth groove a3, and is disposed around the first connecting portion 21. In this way, the first insulator portion 310 provides insulation protection for the first surface 210 of the first connecting portion 21, the second insulator portion 312 provides insulation protection for the peripheral edge of the first connecting portion 21, and the side surface of the first connecting portion 21 facing away from the cover plate 10 is exposed to facilitate welding of the exposed surface to the electrical connector.

[0135] Because each of the second connecting portions 23 of the pole post 20 is pressed against the cover plate 10 by the flange portion 40, the first connecting portion 21 is prone to warping and deformation. To overcome this defect, in some embodiments, please refer to... Figures 12 to 14 The top cover assembly 200 also includes a welded component 70, which is welded and fixed to the first side a1 of the cover plate 10. Part of the welded component 70 also presses against the side surface of the second insulator portion 312 opposite to the bottom wall of the fourth groove a3, thereby pressing the second insulator portion 312, the first connecting portion 21 and the first insulator portion 310 together into the fourth groove a3 of the cover plate 10, and making the force on the pole post 20 more balanced, greatly reducing the risk of deformation of the pole post 20.

[0136] Furthermore, the second insulator portion 312 has a second stepped surface a10 extending along the peripheral edge of the fourth groove a3. The weldment 70 also extends along the peripheral edge of the fourth groove a3 and presses against the second stepped surface a10, making the pressing structure of the weldment 70 against the second insulator portion 312 more stable, thereby making the assembly structure of the pole post 20 and the cover plate 10 more stable and preventing the pole post 20 from shifting position or even detaching from the cover plate 10.

[0137] Optionally, the welded part 70 includes a first welded portion 71, a second welded portion 72, and a third welded portion 73. The first welded portion 71, the second welded portion 72, and the third welded portion 73 are connected sequentially and form a Z-shape. The first welded portion 71 is welded and fixed to the first side surface a1 of the cover plate 10, and the third welded portion 73 extends to the second step surface a10 and abuts against the second step surface a10.

[0138] It should be noted that, in order to achieve the assembly of the first connecting part 21 and the cover plate 10, in some embodiments, please refer to [the relevant documentation / reference needed]. Figures 2 to 7By providing the second groove 216 and the third groove a5, the first connecting part 21, the first insulating part 31, and the cover plate 10 are fixed together. In other embodiments, the first connecting part 21 is pressed onto the cover plate 10 by providing the welding member 70. Of course, in yet other embodiments, please refer to... Figures 12 to 14 The first connecting part 216 and the third groove a5 are provided to fix the first connecting part 21, the first insulating part 31 and the cover plate 10 together. The welding part 70 is also provided to press the first connecting part 21 onto the cover plate 10. As long as the bonding force between the first connecting part 21 and the cover plate 10 meets the requirements, no special limitation is made here.

[0139] Specifically, in the embodiment, at least one second through hole 2710 is provided on the first transition sub-part 273, and the first insulating member 30 further includes a third insulating part 33 filled in the second through hole 2710 (see Figure 14 The third insulating part 33 is connected to the first insulating part 31 and the second insulating part 32. The first insulating part 31, the second insulating part 32 and the third insulating part 33 are integrally injection molded. Thus, during injection molding, a portion of the injection molding material flows to the surfaces of each of the second connecting parts 23, transition parts 27 and connecting parts 25, and solidifies to form the second insulating part 32; another portion of the injection molding material flows through the second through hole 2710 into the injection space between the first connecting part 21 and the cover plate 10 and the peripheral surface of the first connecting part 21, and solidifies to form the third insulating part 33 in the second through hole 2710, forming the first insulator part 310 between the first connecting part 21 and the cover plate 10, and forming the second insulator part 312 at the peripheral edge of the first connecting part 21.

[0140] Understandably, the third insulating portion 33 filled within the second through hole 2710 can compensate for the structural strength loss of the first transition portion 273 due to the formation of the second through hole 2710, thus preventing the structural strength of the pole post 20 from being too low. Moreover, it can also increase the contact area between the first insulating member 30 and the pole post 20, thereby enhancing the bonding force between them.

[0141] It should be noted that the second through hole 2710 on the first transition sub-section 273 serves two purposes: firstly, it facilitates the flow of injection molding material during injection molding; secondly, it reduces the flow area of ​​the first transition sub-section 273, ensuring that the first transition sub-section 273 can melt and cut off the circuit in time in case of an abnormality.

[0142] Furthermore, the first side a1 of the cover plate 10 also has a fifth groove a4 (see Figure 4Each of the second connecting portions 23 is located within the fifth groove a4. Each of the aforementioned first through holes a6 is formed within the fifth groove a4, such that the first connecting sub-parts 231 of the second connecting portions 23 are supported on the bottom wall of the fifth groove a4, and the second connecting sub-parts 233 of the second connecting portions 23 pass through the corresponding second through holes 2710. Thus, on the one hand, the first connecting sub-parts 231 of each second connecting portion 23 sinks into the fifth groove a4, which helps to reduce the drawing depth of the second connecting sub-parts 233, reduce the process difficulty, and improve the drawing quality.

[0143] Furthermore, the fifth groove a4 is connected to the aforementioned fourth groove a3, and the point where they connect forms an angle a11 (see...). Figure 4 The flanged portion 40 is a strip extending along the peripheral edge of the fourth groove a3. The distance between the end of the flanged portion 40 near the first connecting portion 21 and the corner a11 is greater than or equal to 1.4 mm, thereby preventing interference between the rolling device and the second insulator portion 312 when the flanged portion 40 is rolled.

[0144] Specifically, in this embodiment, the side of the first connecting portion 21 opposite to the first surface 210 (i.e., the side of the first connecting portion 21 away from the cover plate 10) has a boss 212 and an annular surface 214. The annular surface 214 surrounds the boss 212, and the boss 212 protrudes relative to the annular surface 214 in a direction away from the first surface 210. It is understood that the surface of the boss 212 and the annular surface 214 together form the aforementioned second surface 211. Electrical connectors are welded to the boss 212, and the second insulator portion 312 is lower than or flush with the annular surface 214. Thus, by providing the boss 212, during injection molding, the flow of injection molding material onto the boss 212 can be prevented, causing the second insulator portion 312 to cover the surface of the boss 212.

[0145] In this embodiment, the protrusion height H5 of the boss 212 relative to the annular surface 214 is 0.05mm to 0.8mm, and H5 can be within multiple ranges such as 0.1mm to 0.6mm or 0.3mm to 0.5mm. It should be noted that H5 can be 0.05mm, 0.20mm, 0.35mm, 0.50mm, 0.65mm, or 0.8mm, etc., including but not limited to the listed values. Other values ​​within the above ranges are still applicable and are not specifically limited here.

[0146] It should be noted that if the distance between the two second connecting parts 23 is too small, the distance between the two first through holes a6 will be too close, increasing the difficulty of forming the first through holes a6 and the flanged part 40 by stamping. If the distance between the two second connecting parts 23 is too large, the pole post 20 will have a larger dimension in the width direction of the cover plate 10, making it unsuitable for cover plates 10 with smaller widths. In this embodiment, the distance between the first connecting sub-parts 231 of the two second connecting parts 23 is 5mm to 15mm, which is moderate and can avoid the above-mentioned defects caused by the distance between the two second connecting parts 23 being too small or too large.

[0147] Specifically, the distance between the two second connecting parts 23 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc., including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here.

[0148] Please see Figure 15 As shown, in a specific embodiment, the top cover assembly 200 further includes a plurality of sealing rings 50 corresponding one-to-one with each of the second connecting portions 23. Each sealing ring 50 includes a first sealing portion 51 and a second sealing portion 52. The first sealing portion 51 and the second sealing portion 52 are both sleeved on the second connecting portion 233. The first sealing portion 51 is located between the inner wall of the first through hole a6 and the second connecting portion 233. The second sealing portion 52 is located between the bottom wall of the fifth groove a4 and the first connecting portion 231, so that the first connecting portion 231 is supported on the bottom wall of the fifth groove a4 by the second sealing portion 52. In this way, on the one hand, the sealing rings 50 seal the first through hole a6 on the cover plate 10 to prevent the electrolyte in the housing 100 from leaking out through the first through hole a6; on the other hand, the sealing rings 50 form insulation between the first connecting portion 231 and the second connecting portion 233 and the cover plate 10 to prevent the electrode post 20 from being electrically connected to the cover plate 10.

[0149] Furthermore, a first protrusion 11 is provided on the bottom wall of the fifth groove a4, and the first protrusion 11 extends around the first through hole a6. The second sealing part 52 of the sealing ring 50 covers and is pressed against the first protrusion 11. In this way, the position of the second sealing part 52 is defined by the first protrusion 11, preventing the second sealing part 52 from being squeezed into the first through hole a6 and causing the seal to fail.

[0150] It should be noted that the top cover assembly 200 can be assembled using either pre-injection molding or one-piece injection molding. Please refer to [link / reference]. Figure 5The pre-injection molding method refers to the following steps: First, the pole post 20 is formed using a stamping process; then, the first insulating part 30 is injection molded onto the pole post 20, so that the pole post 20 and the first insulating part 30 form an integral whole; then, the sealing ring 50 is fitted onto the second connecting part 233 of the pole post 20, and the second connecting part 233 of the pole post 20 is inserted into the first through hole a6 on the cover plate 10; then, the flanged part 40 is rolled, so that part of the flanged part 40 is bent onto the second insulating part 32 of the first insulating part 30, and the welding part 70 is welded to the first side surface a1 of the cover plate 10, so that the welding part 70 presses against the second insulating part 312 of the first insulating part 30. That is, under the combined action of the flanged part 40 and the welding part 70, the pole post 20 and the first insulating part 30 are pressed tightly onto the cover plate 10, while the sealing ring 50 is compressed, so that the sealing ring 50 seals the first through hole a6.

[0151] In the pre-injection molding method, since the flanged portion 40 is rolled to the folded state after the first insulating part 30 is injection molded, the second insulating portion 32 of the injection-molded first insulating part 30 does not cover the flanged portion 40.

[0152] Please see Figure 15 As shown, the integral injection molding method refers to: first, forming the pole post 20 using a stamping process; then, fitting the sealing ring 50 onto the second connecting part 233 of the pole post 20, and inserting the second connecting part 233 into the first through hole a6 on the cover plate 10; then, inserting the pole post 20, the sealing ring 50, and the cover plate 10 as a whole into the injection mold for injection molding, thereby injection molding the first insulating part 30 (the flanged part 40 has been rolled during the injection molding of the first insulating part 30). During the injection molding of the first insulating part 30, pressure is applied to the pole post 20, causing the pole post 20 to compress the sealing ring 50, so that the sealing ring 50 maintains a certain amount of compression; after injection molding is completed, the cover plate 10, the sealing ring 50, the pole post 20, and the first insulating part 30 are removed from the injection mold as a whole. At this time, the pressure on the pole post 20 disappears, but due to the pressing action of the flange 40 on the first insulating member 30, the pole post 20 and the first insulating member 30 can remain pressed tightly on the cover plate 10, and the sealing ring 50 can also remain in a compressed state.

[0153] In the one-piece injection molding method, since the flanged portion 40 has been rolled to a folded state before the first insulating part 30 is injection molded, the second insulating portion 32 of the injection-molded first insulating part 30 also covers the flanged portion 40.

[0154] In embodiments of this application, the top cover assembly 200 further includes a second insulating member 60, which is disposed between the cover plate 10 and the cell assembly 300, thereby insulating the cover plate 10 and the cell assembly 300. The second insulating member 60 has third through holes a8 corresponding to each of the first through holes a6. The second connecting sub-parts 233 of each second connecting part 23 pass through the corresponding first through holes a6 and third through holes a8, and the second end c2 of each second connecting sub-part 233 is flush with the surface of the second insulating member 60 facing the cell, or the second end c2 of each second connecting sub-part 233 protrudes from the surface of the second insulating member 60 facing the cell, so that the second end c2 of the second connecting sub-part 233 can be welded to the corresponding tab 302.

[0155] Furthermore, the second insulating member 60 has a second protruding strip 62 protruding on the side facing the cover plate, which surrounds the third through hole a8. The second protruding strip 62 abuts against the first sealing part 51 in the corresponding first through hole a6, thereby compressing the first sealing part 51 and ensuring the sealing effect on the first through hole a6.

[0156] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0157] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pole, characterized in that The first connecting part (21) is used for connecting with an electrical connecting piece, and each second connecting part (23) is used for connecting with a tab respectively.

2. The pole according to claim 1, characterized in that The first connecting part (21) has a first surface (210) as a side surface in the pole thickness direction (Z), each second connecting part (23) at least partially protrudes from the first surface (210) in the pole thickness direction (Z), and the part of each second connecting part (23) protruding from the first surface (210) is used for connecting with a tab; the pole thickness direction (Z) is perpendicular to the first preset direction (X) and the second preset direction (Y).

3. The pole according to claim 2, characterized in that The first connecting part (21) further has a second surface (211) opposite to the first surface (210), and the second surface (211) protrudes from each second connecting part (23) in the pole thickness direction (Z).

4. The pole according to claim 2, wherein Each second connecting part (23) comprises a first connecting sub-part (231) and a second connecting sub-part (233), the first connecting sub-part (231) is connected to the first connecting part (21), the first connecting sub-part (231) is arranged around and connected to a first end (c1) of the second connecting sub-part (233), and a second end (c2) of the second connecting sub-part (233) protrudes from the first surface (210) in the pole thickness direction (Z) relative to the first connecting sub-part (231).

5. The pole according to claim 4, characterized in that The first end (c1) of the second connecting sub-part (233) has a first groove (b1).

6. The pole according to claim 2, wherein The pole (20) further comprises a transition part (27), and the transition part (27) is connected to the first connecting part (21) and each second connecting part (23).

7. The pole according to claim 6, characterized in that The transition part (27) comprises a first transition sub-part (273), and in the second preset direction (Y), the first transition sub-part (273) is located between the first connecting part (21) and each second connecting part (23).

8. The pole according to claim 7, characterized in that The transition part (27) further comprises a second transition sub-part (271), and the second transition sub-part (271) is connected to the first transition sub-part (273) and each second connecting part (23) and extends along an edge of the second connecting part (23).

9. The pole according to claim 7, wherein The length dimension of the first transition sub-part (273) from one end connected to the first connecting part (21) to one end connected to the second connecting part (23) is 3mm-6mm; and / or, The first transition sub-portion (273) has a third end connected with the first connecting portion (21) and a fourth end opposite to the third end and connected with the second connecting portion (23).

10. The pole according to claim 7, wherein The first transition sub-portion (273) extends obliquely from the third end to the fourth end relative to the pole thickness direction (Z) so that the fourth end protrudes beyond the first surface (210) of the first connecting portion (21) in the pole thickness direction (Z). The first transition sub-portion (273) extends from the third end to the fourth end at an angle α of 15°-60° relative to the pole thickness direction (Z).

11. The pole according to claim 10, characterized in that The first transition sub-portion (273) has a flow area smaller than that of the first connecting portion (21) and smaller than that of the second connecting portion (23).

12. The pole according to claim 7, wherein The first transition sub-portion (273) is provided with a second through hole (2710).

13. The pole according to claim 12, characterized in that The flow area of the first transition sub-portion (273) is 7.5mm 2 ~ 20mm 2 .

14. The pole as defined in claim 7, wherein The pole (20) further comprises a connecting portion (25) connected between two adjacent second connecting portions (23).

15. The pole as claimed in claim 6, wherein The connecting portion (25) is located on a side of the transition portion (27) away from the first connecting portion (21) and is spaced apart from the transition portion (27).

16. The pole according to claim 15, wherein The connecting portion (25) is located on a side of the transition portion (27) away from the first connecting portion (21), and a third surface (2521) is formed on a side of the connecting portion (25) away from the transition portion (27), the third surface (2521) being recessed towards the transition portion (27) relative to two adjacent second connecting portions (23).

17. The pole as claimed in claim 15, wherein The first connecting portion (21) further has a second groove (216) formed on the first surface (210), the second groove (216) being gradually narrowed or stepwise narrowed from a groove bottom to a groove opening.

18. The pole as set forth in claim 2, wherein The number of the second connecting portions (23) is two, and the distance between the two second connecting portions (23) is 5-15 mm.

19. The pole as defined in claim 1, wherein The cover plate (10) has a first side (a1), a second side (a2) opposite to the first side (a1), and a first through hole (a6) penetrating the first side (a1) and the second side (a2); the first connecting portion (21) is arranged on the first side (a1) of the cover plate (10), the first preset direction (X) is parallel to the width direction of the cover plate (10), each second connecting portion (23) is arranged in a corresponding first through hole (a6), and the first insulating member (30) comprises a first insulating portion (31) formed between the cover plate (10) and the first connecting portion (21) for insulation.

20. A cap assembly characterized by, ​ ​ 21. The roof assembly of claim 20, wherein, The first insulating part (30) further comprises a second insulating part (32) covering at least partially the second connecting part (23); The top cover assembly further comprises a flange part (40) connected to the first side (a1) of the cover plate (10) and bent to abut against a side of the second insulating part (32) away from the cover plate (10).

22. The roof assembly of claim 21, wherein, The flange part (40) extends along a circumferential edge of the second connecting part (23).

23. The roof assembly of claim 21, wherein, A distance between the flange part (40) and an edge of the cover plate (10) is greater than or equal to 2.5 mm.

24. The roof assembly of claim 20, wherein, The first connecting part (21) has a first surface (210) facing the cover plate (10) and a second groove (216) formed in the first surface (210), and a part of the first insulating part (31) is filled in the second groove (216); and / or A third groove (a5) is formed in an area of the cover plate (10) covered by the first insulating part (31), and a part of the first insulating part (31) is filled in the third groove (a5).

25. The roof assembly of claim 24, wherein, The second groove (216) is gradually narrowed or stepwise narrowed at least partially in a direction from a groove bottom to a groove opening.

26. The roof assembly of claim 24, wherein, The third groove (a5) is gradually narrowed or stepwise narrowed at least partially in a direction from a groove bottom to a groove opening.

27. The roof assembly of claim 20, wherein, The first side (a1) of the cover plate (10) has a fourth groove (a3), the first connecting part (21) is arranged in the fourth groove (a3), and the first insulating part (31) is arranged between the first connecting part (21) and an inner wall of the fourth groove (a3).

28. The roof assembly of claim 27, wherein, The first insulating part (31) comprises a first insulating subpart (310) between the first connecting part (21) and a bottom wall of the fourth groove (a3), and a second insulating subpart (312) between a circumferential side of the first connecting part (21) and a side wall of the fourth groove (a3) and arranged around the first connecting part (21); The top cover assembly further comprises a welding part (70) welded to the first side (a1) of the cover plate (10), and a part of the welding part (70) abuts against a side of the second insulating subpart (312) away from the bottom wall of the fourth groove (a3).

29. The roof assembly of claim 28, wherein, The welding part (70) extends along a circumferential edge of the fourth groove (a3).

30. The roof assembly of claim 20, wherein, The first side (a1) of the cover plate (10) further has a fifth groove (a4), each second connecting part (23) is arranged in the fifth groove (a4), and each first through hole (a6) is formed in the fifth groove (a4).

31. The roof assembly of claim 20, wherein, Each of the second connecting portions (23) has a first groove (b1) on a side away from the cover plate (10), and the first insulating member (30) further comprises a second insulating portion (32) covering each of the second connecting portions (23), wherein the second insulating portion (32) is recessed into the first groove (b1) and forms a first pit (b2) in a region corresponding to the first groove (b1).

32. The roof assembly of claim 20, wherein, The top cover assembly further comprises at least two sealing rings (50), each of the second connecting portions (23) comprises a first connecting sub-portion (231) and a second connecting sub-portion (233), and each of the sealing rings (50) comprises a first sealing portion (51) and a second sealing portion (52) which are both sleeved on the corresponding second connecting sub-portion (233), the first sealing portion (51) is located between the second connecting sub-portion (233) and the inner wall of the first through hole (a6), and the second sealing portion (52) is located between the first side (a1) of the cover plate (10) and the first connecting sub-portion (231).

33. The roof assembly of claim 20, wherein, The first connecting portion (21) has a dimension L1 along the first preset direction (X), the cover plate has a dimension L2 along the first preset direction (X), and L1 / L2≥1 / 2.

34. The roof assembly of claim 20, wherein, The number of the pole posts (20) is two, both of the pole posts (20) are arranged on the cover plate (10) and are respectively located at two ends of the cover plate (10) in the length direction, and each of the second connecting portions (23) of each of the pole posts (20) is arranged at intervals along the width direction of the cover plate (10), and the width direction of the cover plate (10) is consistent with the first preset direction; In any of the two pole posts (20), each of the second connecting portions (23) is located on a side of the first connecting portion (21) close to or away from the other pole post (20).

35. A battery cell, characterized by The battery cell comprises a shell, an electric core assembly, and the top cover assembly according to any one of claims 20 to 34. The shell has a receiving cavity and an opening communicating with the receiving cavity, the cover plate (10) is arranged at the opening, the second side (a2) of the cover plate (10) faces into the receiving cavity, the electric core assembly is arranged in the receiving cavity and has at least two of the tabs on a side facing the cover plate (10), and each of the second connecting portions (23) is connected with the corresponding tab by the part penetrating through the first through hole (a6) into the receiving cavity.

36. A battery, comprising: The battery cell according to claim 35.

37. An electrical device, comprising: The battery cell according to claim 35 or the battery according to claim 36.

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