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

Abstract

The invention relates to a pole, a top cover assembly, a battery monomer, a battery and an electric device. The pole comprises a first connecting part, a second connecting part and a fusing part, the at least two second connecting parts are arranged at intervals along the preset direction, namely the thickness direction of the shell, so that the tabs extending from the at least two groups of battery cells in the battery cell assembly respectively correspond to the positions of the at least two second connecting parts. When the pole column and the battery cell assembly are welded, the tabs of each group of battery cells can be directly welded with the corresponding second connecting parts respectively, so that an adapter plate is omitted. And when the single battery is abnormal, the fusing part between the first connecting part and the second connecting part is easy to fuse, so that the circuit is cut off. Therefore, the pole, the top cover assembly and the battery monomer can ensure the safety on the premise of omitting an adapter plate.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to an electrode post, a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] When the internal temperature of a battery cell rises abnormally, the circuit needs to be cut off promptly to ensure safety. Currently, a fuse structure is typically installed on the adapter plate; this fuse melts when the temperature is too high, thus cutting off the circuit. To improve space utilization and simplify manufacturing processes, related technologies have omitted the adapter plate from the battery cell and directly welded the tabs to the terminals. However, this direct connection between the tabs and terminals generates high heat and dissipates heat slowly. Furthermore, the lack of a fuse structure means the circuit cannot be cut off promptly in case of an anomaly, significantly impacting safety. Summary of the Invention

[0003] Therefore, it is necessary to provide a terminal post, top cover assembly, battery cell, battery, and power device that can ensure safety without omitting the adapter piece, in order to address the above problems.

[0004] An electrode post includes a first connecting portion, a second connecting portion, and a fusible portion. At least two second connecting portions are spaced apart along a preset direction. The first connecting portion is electrically connected to each second connecting portion through the fusible portion. In the thickness direction of the electrode post, the orthographic projection of the first connecting portion and the orthographic projection of the second connecting portion do not coincide. The first connecting portion is used to connect an electrical connector, and the second connecting portion is used to connect an electrode tab.

[0005] In one embodiment, the first connecting portion is disposed between the two second connecting portions, and the first connecting portion is electrically connected to the two second connecting portions respectively through the two fuse portions.

[0006] In one embodiment, the first connecting portion has a third surface for welding with an electrical connector on one side along the thickness direction of the pole post, and a first surface opposite to the third surface is formed on the other side along the thickness direction of the pole post. The second connecting portion and the fusion portion are located on the side of the third surface close to the first surface.

[0007] In one embodiment, the fuse portion has a hollow structure that extends through the fuse portion along the thickness direction of the pole post.

[0008] In one embodiment, the first connecting portion has a third surface for welding with an electrical connector on one side along the thickness direction of the pole post, and a first surface opposite to the third surface is formed on the other side along the thickness direction of the pole post. The hollow structure at least partially narrows from the side closer to the first surface to the side closer to the third surface.

[0009] In one embodiment, the hollow structure includes a strip-shaped hole located in the middle of the fused portion and extending along the length of the fused portion.

[0010] In one embodiment, the hollow structure includes a plurality of second through holes, which are spaced apart along the length of the fused portion.

[0011] In one embodiment, the hollow structure includes notches located at the two edges along the length of the fused portion.

[0012] In one embodiment, the fused portion has a thinning structure formed on at least one side along the thickness direction of the pole post.

[0013] In one embodiment, the flow area of ​​the fuse is 6 mm² to 24 mm².

[0014] In one embodiment, the pole includes a first metal layer and a second metal layer stacked along the thickness direction; the first metal layer and the second metal layer both extend to the first connection portion and at least two second connection portions; or, the first metal layer extends to the first connection portion and at least two second connection portions, and the second metal layer is located at at least two second connection portions.

[0015] A top cover assembly includes a cover plate, a first insulating member, and an electrode post as described in any of the above embodiments. The cover plate has a first through hole, a first connecting portion is installed on a first side of the cover plate, at least two second connecting portions extend from the first through hole to a second side of the cover plate, and at least a portion of the first insulating member is disposed between the cover plate and the electrode post.

[0016] In one embodiment, each pole post corresponds to at least two first through holes spaced apart along the preset direction, and at least two second connecting portions are respectively inserted into at least two first through holes.

[0017] In one embodiment, when the fusible portion has a hollow structure, the hollow structure penetrates the fusible portion along the thickness direction of the pole post, and the first insulating member fills at least part of the hollow structure; when the fusible portion has a thinning structure formed on at least one side along the thickness direction of the pole post, the first insulating member fills at least part of the thinning structure.

[0018] In one embodiment, the first insulating member includes a first insulating portion and a third insulating portion, the first insulating portion being disposed between the cover plate and the first connecting portion, the third insulating portion filling at least part of the hollow structure or at least part of the thinned structure, and the third insulating portion being connected to the first insulating portion.

[0019] In one embodiment, the first insulating element covers at least a portion of the fused portion.

[0020] In one embodiment, the thickness of the portion of the first insulating member covering the fused portion is 0.5 mm or more.

[0021] In one embodiment, the first insulating element does not cover the fused portion.

[0022] In one embodiment, the cover plate has a receiving groove formed on the side facing the first connection portion corresponding to the position of the fused portion.

[0023] In one embodiment, the depth of the receiving groove is 0.3 mm to 0.7 mm.

[0024] In one embodiment, the first insulating member extends between the fused portion and the receiving groove.

[0025] In one embodiment, the thickness of the first insulating member extending to the portion between the fused portion and the receiving groove is 0.1 mm to 0.5 mm.

[0026] In one embodiment, the first insulating member has a void-avoiding structure formed between the fused portion and the receiving groove.

[0027] In one embodiment, the first insulating member has a flow guide groove, one end of which extends to the fused portion, and the opening at the other end is located on the side of the first insulating member.

[0028] In one embodiment, the width of the guide channel is 1 mm to 2.5 mm, and / or the depth of the guide channel is 1.5 mm to 2.5 mm.

[0029] In one embodiment, the bottom wall of the flow channel gradually slopes toward the cover plate from one end near the fuse portion to the other.

[0030] A battery cell includes a housing, a cell assembly, and a top cover assembly as described in any of the above embodiments; the housing has an opening at at least one end, the cell assembly is housed within the housing, the top cover assembly covers the opening, and the width direction of the housing is consistent with the preset direction; the cell assembly includes at least two sets of cells arranged side by side along the width direction of the housing, and the at least two sets of cells are configured to correspond one-to-one with at least two second connecting portions, each set of cells has an end face extending out a tab, and the tab of each set of cells is respectively connected to the corresponding second connecting portion.

[0031] Compared with the prior art, this application has at least the following advantages: In the aforementioned terminals, top cover assembly, and battery cells, at least two second connecting portions of the terminals are spaced apart along a predetermined direction, i.e., the width direction of the casing. Therefore, the tabs extending from at least two sets of cells in the cell assembly correspond to the positions of at least two second connecting portions. When welding the terminals to the cell assembly, the tabs of each set of cells can be directly welded to their corresponding second connecting portions, thus eliminating the need for adapters. Furthermore, when a battery cell malfunctions, the fusible link between the first and second connecting portions is prone to melting, thereby cutting off the circuit. Therefore, the aforementioned terminals, top cover assembly, and battery cells can ensure safety without requiring adapters.

[0032] In addition, this application also provides a battery and an electrical device.

[0033] A battery includes a plurality of battery cells as described in the above embodiments, the plurality of battery cells being electrically connected by an electrical connector, and the electrical connector being connected to the first connection portion.

[0034] An electrical device includes a battery cell as described in the above embodiments or a battery as described in the above embodiments. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a cross-sectional view of a single battery cell in one embodiment of the present invention; Figure 2 is a schematic diagram of the top cover assembly in one embodiment of the present invention; Figure 3 is an exploded view of the top cover assembly shown in Figure 2; Figure 4 is a cross-sectional view of the top cover assembly shown in Figure 2 along AA; Figure 5 is a cross-sectional view of the top cover assembly shown in Figure 2 along A1-A1; Figure 6 is a schematic diagram of the pole post structure in one embodiment of the present invention; Figure 7 is a cross-sectional view of the pole shown in Figure 6; Figure 8 is a cross-sectional view of the pole post in another embodiment of the present invention; Figure 9 is a cross-sectional view of the pole post in another embodiment of the present invention; Figure 10 is a schematic diagram of the pole post structure in another embodiment of the present invention; Figure 11 is a schematic diagram of the pole post structure in another embodiment of the present invention; Figure 12 is a schematic diagram of the top cover assembly in the second embodiment of the present invention; Figure 13 is an exploded view of the top cover assembly shown in Figure 12; Figure 14 is a cross-sectional view of the top cover assembly shown in Figure 12 along BB; Figure 15 is a structural schematic diagram of the top cover assembly in the third embodiment of the present invention; Figure 16 is an exploded view of the top cover assembly shown in Figure 15; Figure 17 is an enlarged schematic diagram of a portion C in the top cover assembly shown in Figure 15. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be 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 the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of 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.

[0042] 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.

[0043] This invention discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell and is capable of providing electrical energy. 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Furthermore, referring to Figure 1, the present invention also provides a top cover assembly 100. In one embodiment of the present invention, the battery cell 10 includes the top cover assembly 100, the housing 200, and the cell assembly 300.

[0048] The housing 200 has a hollow structure, with internal space for accommodating the battery cell assembly 300, electrolyte, and other components. At least one end of the housing 200 has an opening through which the battery cell assembly 300 can be installed. Since the battery cell 10 in this embodiment is a prismatic battery, the outer contour of the housing 200 is cuboid, and its opening is rectangular. The top cover assembly 100 is mounted on the housing 200 and covers its opening, thereby creating a relatively closed environment inside the housing 200 to isolate the battery cell assembly 300 from the external environment. Because the shape of the top cover assembly 100 needs to match the shape of the opening of the housing 200, the top cover assembly 100 is approximately rectangular.

[0049] The cell assembly 300 is the core component of the battery cell 10. To adapt to the shape of the casing 200, the cell assembly 300 in this embodiment is generally rectangular. The cell assembly 300 typically includes at least two groups of cells 310 arranged side-by-side along the width of the casing 200. Each group of cells 310 extends a tab 311 from its end face near the top cover assembly 100. Each group of cells can consist of one cell or multiple cells; this is not limited here. When each group of cells includes one cell, that cell extends a tab 311 towards the end face of the top cover assembly 100. When each group of cells includes multiple cells, each cell extends a tab 311 towards the end face of the top cover assembly 100, and the tabs 311 on the cells in the same group are brought together to form a set of tabs 311. The battery cell 310 can be formed by winding or stacking positive electrode plates, negative electrode plates, and a separator that serves as an insulator between the negative electrode plate and the positive electrode plate. The battery cell 310 formed by winding can be pressed into a flat shape. The tabs 311 of each battery cell 310 are divided into positive tabs (not shown in the figure) and negative tabs (not shown in the figure), which are led out from the positive electrode plate and the negative electrode plate, respectively.

[0050] In this embodiment, the positive and negative tabs can be located at the same end of the battery cell 310, or the positive tab can be located at one end of the battery cell 310 and the negative tab at the opposite end of the battery cell 310. Specifically, in this embodiment, the battery cell assembly 300 includes two sets of battery cells 310. The positive and negative tabs of each set of battery cells 310 are located at the same end of the battery cell 310 and are spaced apart along the length direction of the battery cell assembly 300, that is, the length direction of the housing 200. Therefore, the battery cell assembly 300 has a total of four sets of tabs 311 near the end face of the top cover assembly 100, of which two sets are negative tabs spaced apart along the width direction of the housing 200, and the other two sets are positive tabs spaced apart along the width direction of the housing 200, while the two sets of negative tabs and the two sets of positive tabs are spaced apart along the length direction of the housing 200.

[0051] The width direction of the aforementioned housing 200 is also its thickness direction, and the width direction of the battery cell assembly 300 is also its thickness direction. The length direction of the housing 200 refers to the direction perpendicular to the plane of the drawing, as shown in Figure 1, while the width direction of the housing 200 refers to the left-right direction, as shown in Figure 1. Due to obstruction, only two sets of tabs 311 are shown in the figure, and both sets of tabs 311 are positive tabs.

[0052] Before the battery cell assembly 300 is installed into the housing 200, it needs to be assembled with the top cover assembly 100. Specifically, the tabs 311 of the battery cell assembly 300 need to be electrically connected to the terminals 110 on the top cover assembly 100 (see Figure 2) before the battery cell assembly 300 is installed into the housing 200. This operation will not be restricted by the small space inside the housing 200.

[0053] Please refer to Figures 2 and 3 together. In one embodiment of the present invention, the top cover assembly 100 includes a pole post 110, a cover plate 120 and a first insulating member 130.

[0054] The cover plate 120 can be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or steel. The cover plate 120 has a first side and a second side arranged opposite each other along its thickness direction. The second side is the inner side, referring to the surface of the cover plate 120 facing the interior of the housing 200 when covering the opening of the housing 200, while the first side is the outer side, referring to the surface of the cover plate 120 facing away from the interior of the housing 200. Specifically, in this embodiment, the cover plate 120 is generally rectangular, matching the shape of the opening of the housing 200. The cover plate 120 has a first through hole 121 through which the pole post 110 can be installed.

[0055] The terminal post 110 is mounted on the cover plate 120, and at least a portion of the first insulating member 130 is disposed between the cover plate 120 and the terminal post 110 to form insulation. The first insulating member 130 can be injection molded with the terminal post 110 first, and then assembled as a whole with the cover plate 120; or the terminal post 110 can be assembled with the cover plate 120 first, and then the first insulating member 130 can be integrally injection molded.

[0056] Since the positive and negative tabs of the battery cell assembly 300 are located at the same end, the cover plate 120 has two spaced-apart posts 110 along its length. The two posts 110 are used to weld to the positive and negative tabs of the battery cell assembly 300, respectively. Of course, if the positive and negative tabs are located at opposite ends of the battery cell assembly 300, only one post 110 needs to be provided on the cover plate 120.

[0057] Please refer to Figures 4 to 6. The terminal 110 includes a first connecting portion 111, a second connecting portion 112, and a fusible portion 113. At least two second connecting portions 112 are provided, and these at least two second connecting portions 112 are spaced apart along a predetermined direction, which is consistent with the width direction of the housing 200 (i.e., the width direction of the cover plate 120). The first connecting portion 111 is used to connect an electrical connector (not shown), and the second connecting portion 112 is used to connect a tab 311. When multiple battery cells 10 are connected by an electrical connector, the electrical connector can be connected to the first connecting portion 111 by means of welding or other methods. Specifically, the electrical connector can be a busbar or a terminal 110 of another battery cell 10.

[0058] The first connecting portion 111 is electrically connected to each of the second connecting portions 112 via the fusion portion 113. Furthermore, when projected onto a dummy plane perpendicular to the thickness direction of the pole post 110, the orthographic projection of the first connecting portion 111 does not coincide with the orthographic projection of the second connecting portion 112. This increases the distance between the first connecting portion 111 and the second connecting portion 112 in the width direction of the cover plate 120, thereby reducing the impact of welding temperature on the reliability of the sealing ring and lowering the risk of thermal cracking of the first insulating component 130 during welding of the first connecting portion 111 and the electrical connector.

[0059] During the operation of the battery cell 10, current is transmitted between the first connection portion 111 and the second connection portion 112 via the fuse portion 113. Furthermore, the first connection portion 111 is mounted on the first side (i.e., the outer side) of the cover plate 120, and at least two second connection portions 112 extend from the first through hole 121 to the second side (i.e., the inner side) of the cover plate 120. Moreover, at least two sets of battery cells 310 in the cell assembly 300 are arranged in a one-to-one correspondence with at least two second connection portions 112, and the tabs 311 of each set of battery cells 310 are connected to the corresponding second connection portion 112.

[0060] The tabs 311 of the battery cell 310 can be welded to the corresponding second connecting parts 112 using methods such as laser welding, ultrasonic welding, or pressure welding, or they can be bonded to the corresponding second connecting parts 112 using conductive adhesive. Since the arrangement direction of at least two second connecting parts 112 is consistent with the arrangement direction of at least two sets of battery cells 310 in the battery cell assembly 300, the tabs 311 of at least two sets of battery cells 310 can correspond to the positions of at least two second connecting parts 112 respectively. Therefore, when electrically connecting the tabs 311 of the battery cell assembly 300 to the terminal post 110, the tabs 311 of each set of battery cells 310 can be directly welded to the corresponding second connecting parts 112, thereby omitting the adapter piece.

[0061] The inventors discovered that the direct connection between the tab and the terminal in related technologies has the following problems: Since the tab is usually located on one side of the cell width direction, while the terminal is usually located in the middle of the cell width direction, and the distance between them is relatively large, the conventional approach to directly connect the terminal and the tab is to increase the length of the tab or the length of the bottom of the terminal. However, increasing the length of the tab increases tab redundancy, thereby increasing the risk of the tab being inserted backwards into the cell and the tab tearing; increasing the length of the bottom of the terminal increases the cost of the terminal. In the terminal 110 of this embodiment, the first connecting part 111 is connected between two adjacent second connecting parts 112, and the first connecting part 111 is installed on the outside of the cover plate 120. The second connecting parts 112 sink relative to the first connecting part 111 towards the inside of the housing 200 and extend from the first through hole 121 to the inside of the cover plate 120. Therefore, in this embodiment, the electrode post 110 places the second connecting portion 112 closer to the tab 311, eliminating the need to increase the length of the tab 311 and thus avoiding problems such as the tab 311 being inserted backwards into the battery cell 310 and the tab 311 tearing. Furthermore, compared to conventional solutions that increase the electrode post size, this embodiment only requires the same thickness of the original sheet metal as the first connecting portion 111 to form the electrode post 110. Therefore, the required original sheet metal thickness is reduced, thereby lowering the material cost of the electrode post 110.

[0062] Specifically, in this embodiment, since the battery cell assembly 300 includes two sets of battery cells 310, two corresponding second connection portions 112 are also provided. Furthermore, a first connection portion 111 is disposed between the two second connection portions 112, and the first connection portion 111 is electrically connected to the two second connection portions 112 respectively through two fuse portions 113. At this time, the first connection portion 111 and the two second connection portions 112 are coaxially arranged, and the electrode post 110 is axially symmetrical overall, thus the electrode post 110 can effectively utilize the space in the width direction of the cover plate 120.

[0063] It should be noted that in other embodiments, depending on the number of groups of battery cells 310 in the battery cell assembly 300, the second connection portion 112 may also be provided in more than two ways. It should be clarified that the number of groups of battery cells 310 is not the same as the number of battery cells 310. For example, the battery cell assembly 300 may include four battery cells 310, where two battery cells 310 form one group, with their tabs 311 joined together to form a single tab 311, which is connected to one second connection portion 112; and the other two battery cells 310 form another group, with their tabs 311 joined together to form a single tab 311, which is connected to another second connection portion 112. In this case, the number of groups of battery cells 310 is 2, but the number of battery cells 310 is 4; the two are not the same.

[0064] Furthermore, the first connecting part 111 does not necessarily have to be located between the two second connecting parts 112; the first connecting part 111 can also be located on either side of the second connecting part 112 along the length of the cover plate 120.

[0065] The first through hole 121 on the cover plate 120 can be a single through hole with a large opening range, allowing at least two second connecting parts 112 to pass through together; the first through hole 121 can also be a through hole with a small opening range, allowing only one second connecting part 112 to pass through each first through hole 121. Referring again to Figure 3, specifically in this embodiment, each pole post 110 corresponds to at least two first through holes 121 spaced apart along a preset direction, i.e., the width direction of the cover plate 120, and at least two second connecting parts 112 respectively pass through at least two first through holes 121.

[0066] As can be seen, the first through hole 121 is a through hole with a small opening range, and the area of ​​the cover plate 120 corresponding to the first connecting part 111 does not need to be opened. Therefore, the opening area on the cover plate 120 can be reduced, thereby avoiding a significant decrease in the structural strength of the cover plate 120 due to the opening.

[0067] Taking Figure 3 as an example, four first through holes 121 are provided on the cover plate 120. Two of the first through holes 121 are located at one end of the length direction of the cover plate 120 and are spaced apart along the width direction of the cover plate 120. The other two first through holes 121 are located at the other end of the length direction of the cover plate 120 and are also spaced apart along the width direction of the cover plate 120.

[0068] The fuse 113 is configured to be the first to melt in the event of thermal runaway of a single battery cell, meaning it melts before the first connection 111 and the second connection 112. Specifically, in this embodiment, the flow area of ​​the fuse 113 is smaller than the flow area of ​​the first connection 111 and smaller than the flow area of ​​the second connection 112. The flow area refers to the minimum area through which fluid passes. Here, the flow area of ​​the fuse 113 refers to the surface area of ​​the fuse 113 perpendicular to the current flow direction, i.e., the minimum cross-sectional area of ​​the fuse 113. Similarly, the flow areas of the first connection 111 and the second connection 112 refer to the surface areas of the first connection 111 and the second connection 112 perpendicular to the current flow direction, i.e., the minimum cross-sectional area of ​​the first connection 111 and the second connection 112. A smaller flow area results in higher resistance and greater heat generation when current flows through it. Therefore, when a battery cell 10 malfunctions, the fuse 113 between the first connection portion 111 and the second connection portion 112 will easily melt and break the circuit, thus ensuring safety. In other words, the fuse 113 can function as a fuse structure on a traditional adapter plate.

[0069] Please refer to Figure 7. Specifically, in this embodiment, the first connecting portion 111 has a third surface 1113 for welding with an electrical connector on one side along the thickness direction of the pole post 110, and a first surface 1111 opposite to the third surface 1113 is formed on the other side along the thickness direction of the pole post 110. The second connecting portion 112 and the fusion portion 113 are located on the side of the third surface 1113 close to the first surface 1111.

[0070] The third surface 1113 is generally located on the side of the first connecting portion 111 facing away from the cover plate 120. In practical applications, the third surface 1113 is positioned upwards, while the first surface 1111 is positioned downwards. Thus, the second connecting portion 112 and the fuse portion 113 are located below the third surface 1113 and closer to the cover plate 120 than the third surface 1113. Therefore, in practical applications, the height of the second connecting portion 112 and the fuse portion 113 is lower than that of the third surface 1113; that is, the second connecting portion 112 and the fuse portion 113 sink relative to the third surface 1113 along the thickness direction of the pole post 110. In this way, when the fuse portion 113 melts, it prevents conductive molten material from flowing to the third surface 1113 under gravity and causing the first connecting portion 111 to overlap with the electrical connector, ensuring reliable circuit disconnection.

[0071] Specifically, in this embodiment, the current-passing area of ​​the fuse 113 is 6 mm² to 24 mm². For example, the current-passing area of ​​the fuse 113 can also be located in multiple ranges such as 6 mm²-20 mm², 7.5 mm²-20 mm², 6 mm²-16 mm², 6 mm²-10 mm², 8 mm²-18 mm², and 10 mm²-24 mm², which can be selected according to the actual current-passing conditions and fuse triggering conditions. For example, the current-passing area of ​​the fuse section 113 can be 6mm², 6.4mm², 6.8mm², 7.0mm², 7.2mm², 7.6mm², 8.0mm², 8.3mm², 8.7mm², 9.0mm², 9.5mm², 9.8mm², 10.0mm², 10.4mm², 10.6mm², 11.0mm², 11.3mm², 11.8mm², 12.0mm², 12.5mm², 12.7mm², 13.0mm², 13.5mm², 13.8mm², 14.0mm², or 14mm². 5mm², 15.0mm², 15.5mm², 16.0mm², 16.5mm², 17.0mm², 17.5mm², 18.0mm², 18.5mm², 19.0mm², 19.5mm², 20.0mm², 20.5mm², 21.0mm², 21.5mm², 22.0mm², 22.5mm², 23.0mm², 23.5mm², 24mm², and other values ​​within the above ranges are still applicable. The specific value to be selected can be based on the actual overcurrent conditions and fuse triggering conditions.

[0072] More specifically, the width of the fuse section 113 is 1mm to 5mm. The width direction of the fuse section 113 is approximately the same as the width direction of the cover plate 120, which is the direction from the first connecting part 111 to the second connecting part 112. Of course, the width of the fuse section 113 can also be selected within a corresponding range according to the actual current conditions and fuse triggering conditions. For example, the width of the fuse section 113 can also be located in multiple ranges such as 1mm-4mm, 1mm-3mm, 2mm-5mm, and 2mm-4mm, which can be selected according to the actual current conditions and fuse triggering conditions. For example, the width of the fuse portion 113 can be 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.7mm, 3.0mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 3.8mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5.0mm, including but not limited to the listed values. Other values ​​within the above range are still applicable, and can be selected according to the actual overcurrent conditions and fuse triggering conditions.

[0073] Please refer to Figures 6 to 11 together. In this embodiment, the fuse portion 113 has a hollow structure 1131, which penetrates the fuse portion 113 along the thickness direction of the pole post 110.

[0074] The hollow structure 1131 is non-conductive. The portion of the fuse portion 113 without the hollow structure 1131 constitutes at least one conductive portion 1132, which is conductive. The current-carrying area of ​​the fuse portion 113 is the sum of the current-carrying areas of each conductive portion 1132. By forming the hollow structure 1131 to reduce the current-carrying area between the first connecting portion 111 and the second connecting portion 112, the fuse portion 113 can be obtained. During the injection molding process of the first insulating member 130, the material forming the first insulating member 130 can fill the interior of the hollow structure 1131. That is, the first insulating member 130 fills at least part of the hollow structure 1131. In this way, the structural strength lost by the fuse portion 113 due to the formation of the hollow structure 1131 can be compensated, and the structural strength of the pole post 110 is prevented from being too low. Moreover, the contact area between the first insulating member 130 and the pole post 110 can be increased, thereby improving the bonding force between them.

[0075] Specifically, please refer again to Figures 4 and 5. The first insulating member 130 includes a first insulating portion 131, a second insulating portion 132, and a third insulating portion 133 that are interconnected. The first insulating portion 131 is disposed between the cover plate 120 and the first connecting portion 111. The second insulating portion 132 is disposed between the cover plate 120 and the second connecting portion 112 and extends to the outer surface of the second connecting portion 112. The third insulating portion 133 is disposed corresponding to the fusible portion 113. The third insulating portion 133 fills at least part of the hollow structure 1131.

[0076] Furthermore, in this embodiment, the hollow structure 1131 narrows at least partially from the side closer to the first surface 1111 to the side closer to the third surface 1113.

[0077] In other words, the hollow structure 1131 narrows from the inner side (near the cover plate 120) of the pole post 110 to the outer side (away from the cover plate 120), exhibiting a structure that is thicker at the bottom and thinner at the top. The hollow structure 1131 can gradually narrow or narrow in a stepped manner. Therefore, the portion of the third insulating part 133 that fills the hollow structure 1131 also has a structure that is thicker at the bottom and thinner at the top, thereby providing a greater tensile force between the first insulating member 130 and the pole post 110, preventing the first insulating member 130 from detaching from the hollow structure 1131. The hollow structure 1131 can also be partially narrowed, as long as it can basically achieve the effect of preventing the first insulating member 130 from detaching from the hollow structure 1131.

[0078] More specifically, as shown in Figure 6, in one embodiment, the perforated structure 1131 includes a strip-shaped hole located in the middle of the fusible portion 113 and extending along the length direction of the fusible portion 113. The length direction of the fusible portion 113 is consistent with the length direction of the cover plate 120, and the strip-shaped hole can divide the fusible portion 113 into two conductive portions 1132.

[0079] As shown in Figure 10, in another embodiment, the hollow structure 1131 includes a plurality of second through holes, which are spaced apart along the length of the fusible portion 113. The second through holes can be round or square, and the opening range of a single second through hole is smaller than that of the aforementioned strip-shaped hole, which is more advantageous for maintaining the structural strength of the fusible portion 113. The plurality of second through holes can divide the fusible portion 113 into two or more conductive portions 1132.

[0080] As shown in Figure 11, in another embodiment, the hollow structure 1131 includes notches located at both edges along the length of the fused portion 113. It can be seen that a complete conductive portion 1132 can be formed in the middle of the fused portion 113, resulting in a strong structure.

[0081] It should be noted that on the same pole post 110, the hollow structure 1131 on its fuse part 113 may also include a strip hole, a second through hole and a notch or any combination of two of them.

[0082] Furthermore, in other embodiments, the fusible portion 113 can be obtained without forming the hollow structure 1131. For example, in one embodiment, the fusible portion 113 has a thinning structure (not shown) formed on at least one side along the thickness direction of the electrode post 110 to reduce the flow area. This thinning structure can reduce the thickness of the fusible portion 113 as a whole, or it can be a groove structure formed locally in the fusible portion 113 and partially thinning the fusible portion 113. Similarly, during the injection molding process of the first insulating member 130, the material forming the first insulating member 130 can fill the interior of the thinning structure. That is, the first insulating member 130, specifically the third insulating portion 133, is filled with at least part of the thinning structure. In this way, the structural strength lost by the fusible portion 113 due to the formation of the thinning structure can be compensated and the contact area between the first insulating member 130 and the electrode post 110 can be increased.

[0083] The terminal 110 is divided into a positive terminal and a negative terminal, which are used to connect to the positive and negative tabs of the battery cell assembly 300, respectively. Furthermore, the positive terminal 110, as the positive terminal, is generally integrally formed from aluminum and can be directly contacted and welded to the positive tab of the battery cell. Since the positive terminal and the positive tab of the battery cell assembly 300 are made of the same material, the welding effect between them is improved.

[0084] Please refer to Figures 8 and 9 together. The negative electrode post 110 includes a first metal layer 110a and a second metal layer 110b stacked along the thickness direction. The second metal layer 110b is located on the side of the first metal layer 110a facing the interior of the housing 200, and extends at least to the second connecting portion 112. During assembly with the cell assembly 300, the second metal layer 110b at the second connecting portion 112 directly contacts and welds to the negative electrode tab of the cell assembly 300. More specifically, in this embodiment, the first metal layer 110a is an aluminum layer, and the second metal layer 110b is a copper layer. Since the material of the negative electrode tab of the cell assembly 300 is generally also copper, the second metal layer 110b is made of the same material as the negative electrode tab, which can improve the welding effect between the negative electrode post and the negative electrode tab.

[0085] As shown in Figure 8, in one embodiment, both the first metal layer 110a and the second metal layer 110b extend to the first connecting portion 111 and at least two second connecting portions 112. That is, both the first connecting portion 111 and the second connecting portion 112 are double-layer structures, with copper and aluminum layers on their inner and outer sides, respectively.

[0086] In another embodiment, as shown in Figure 9, the first metal layer 110a also extends to the first connecting portion 111 and at least two second connecting portions 112, while the second metal layer 110b is only located at at least two second connecting portions 112. That is, the second connecting portion 112 remains a double-layer structure, while the first connecting portion 111, since it does not need to be welded to the negative electrode tab, is entirely made of aluminum. In other words, the copper placement in the first connecting portion 111 of the previous embodiment is replaced with aluminum. This saves copper usage and reduces costs while maintaining the structural strength of the electrode post 110. In other embodiments, the copper placement in the first connecting portion 111 of the previous embodiment can also be omitted, thereby reducing the overall thickness of the electrode post 110 to some extent.

[0087] Please refer again to Figures 2 and 4. In this embodiment, the first insulating member 130 covers at least a portion of the fused portion 113. Specifically, the first insulating member 130 covers the outer surface of the conductive portion 1132 of the fused portion 113. Because the fused portion 113 requires thinning or hollowing out of its structure 1131 during its formation, the structural strength of the fused portion 113 is further weakened. By covering the fused portion 113 with the first insulating member 130, additional structural strength can be provided to the fused portion 113, thereby compensating to some extent for the structural strength lost during the forming process and improving the reliability of the electrode post 110. Furthermore, the first insulating member 130 covering the outer surface of the conductive portion 1132 increases the creepage distance from the fused portion 113 to the third surface 1113 of the electrode post 110, and also increases the electrical clearance between the fused portion 113 and the electrical connector when welding the electrical connector. The thickness of the portion of the first insulating member 130 covering the fused portion 113 is 0.5 mm or more. For example, the thickness of this part is 0.5mm-2.0mm to better strengthen the fuse portion 113 and increase the aforementioned creepage distance / clearance. Specifically, the thickness of this part is within multiple ranges such as 0.5mm-1.8mm, 0.5mm-1.5mm, 0.5mm-1.2mm, 0.5mm-0.9mm, 1.8mm-2.0mm, 1.5mm-2.0mm, 1.2mm-2.0mm, 0.9mm-2.0mm, 0.5mm-0.8mm, 0.8mm-1.1mm, 1.1mm-1.6mm, and 0.7mm-1.4mm. The thickness of this part can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, and 0.95mm. The values ​​are 1 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm, and 1.95 mm, including but not limited to the listed values. Values ​​not listed in the above ranges are still applicable and can be selected according to actual needs.

[0088] Of course, in other embodiments, the first insulating member 130 may not cover the fused portion 113. That is, the first insulating member 130 may only fill the hollow structure 1131, but expose the conductive portion 1132 of the fused portion 113. In this way, the state of the fused portion 113 can be directly observed from the outside of the battery cell, and if the abnormality of the battery cell is resolved after the fused portion 113 melts, molten metal (such as molten aluminum) can be injected into the melted area, and the melted part can be reconnected after the molten metal solidifies. In this way, the battery cell can be repaired and reused.

[0089] Furthermore, in this embodiment, a receiving groove 122 is formed on the side of the cover plate 120 facing the first connecting portion 111 corresponding to the fuse portion 113. The receiving groove 122 may be elongated and extend along the length direction of the fuse portion 113; in addition, if the fuse portion 113 is divided into multiple conductive portions 1132, the receiving groove 122 may also be a multi-segment structure, and each segment of the receiving groove 122 corresponds to one conductive portion 1132 of the fuse portion 113.

[0090] The receiving tank 122 provides a large receiving space. When the molten part 113 melts, the molten material can fall downwards and be collected by the receiving tank 122. In this way, the molten material can be discharged from the molten part 113 in a timely manner, thereby avoiding the accumulation of molten material in the molten part 113 and causing secondary overlap of the molten part 113.

[0091] Specifically, in this embodiment, the depth of the receiving groove 122 is 0.3mm to 0.7mm. When the depth of the receiving groove 122 is less than 0.3mm, its depth is too small to provide sufficient receiving space, resulting in the inability to effectively contain the molten material; while when the depth of the receiving groove 122 is greater than 0.7mm, its excessive depth will significantly weaken the structural strength of the cover plate 120 and reduce the reliability of the cover plate 120. The depth of the receiving groove 122 can be in multiple ranges such as 0.3mm-0.5mm, 0.5mm-0.7mm, and 0.4mm-0.6mm. For example, the depth of the receiving groove 122 can be 0.3mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, 0.6mm, 0.63mm, 0.65mm, 0.67mm, or 0.7mm, including but not limited to the listed values. Values ​​not listed in the above range are still applicable and can be selected according to actual needs.

[0092] Referring again to Figure 4, in this embodiment, the first insulating member 130 extends between the fusible portion 113 and the receiving groove 122. That is, the lower surface of the fusible portion 113, i.e., between the fusible portion 113 and the receiving groove 122, is also covered by a layer of the first insulating member 130. On the one hand, this portion of the first insulating member 130 can further strengthen the structural strength of the fusible portion 113; on the other hand, this portion of the first insulating member 130 can also play an insulating role between the fusible portion 113 and the cover plate 120, improving the insulation effect between the pole post 110 and the cover plate 120.

[0093] Although the first insulating element 130 will block the receiving groove 122, when the fused part 113 melts, the high temperature generated can melt the first insulating element 130 between the fused part 113 and the receiving groove 122, so that the molten material can fall smoothly into the receiving groove 122.

[0094] Furthermore, in this embodiment, the thickness of the portion of the first insulating member 130 extending between the fusible portion 113 and the receiving groove 122 is 0.1 mm to 0.5 mm. When the thickness of this portion is less than 0.1 mm, the forming process of this portion becomes more difficult and the processing cost is higher; while when the thickness of this portion is greater than 0.5 mm, it is not easy to melt at high temperatures, which can easily affect the fusing process of the fusible portion 113 and lead to a longer fusing time. The thickness of this portion can be in multiple ranges such as 0.1 mm-0.3 mm, 0.2 mm-0.5 mm, and 0.2 mm-0.4 mm. For example, the thickness of this part is 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, and includes but is not limited to the listed values. Values ​​not listed in the above range are still applicable and can be selected according to actual needs.

[0095] Furthermore, referring to Figures 12, 13, and 14, in the second embodiment, the first insulating member 130 forms a clearance structure (not shown) between the fused portion 113 and the receiving groove 122. That is, the lower surface of the fused portion 113 does not cover the first insulating member 130, so there is no obstruction between the fused portion 113 and the receiving groove 122. Moreover, since the first insulating member 130 does not occupy space, the space between the lower surface of the fused portion 113 and the surface of the cover plate 120 is relatively large. Therefore, the molten material generated when the fused portion 113 melts can be quickly discharged from the fused portion 113 and ultimately collected by the receiving groove 122.

[0096] To avoid the fusible portion 113 from overlapping again after melting, other methods can be used. For example, referring to Figures 15, 16 and 17, in the third embodiment, the first insulating member 130 is provided with a flow guide groove 1301, one end of which extends to the fusible portion 113, and the opening at the other end is located on the side of the first insulating member 130.

[0097] When the fusible link 113 melts, the molten material can enter the guide channel 1301 and flow outward along the guide channel 1301. In this way, the molten material can be prevented from accumulating in the fusible link 113 and causing secondary overlap of the fusible link 113 after cooling and solidification.

[0098] Specifically, in this embodiment, the width of the flow guide 1301 is between 1 mm and 2.5 mm. A width greater than 2.5 mm would significantly reduce the structural strength of the first insulating member 130, while a width less than 1 mm would fail to effectively contain the molten material. The width of the flow guide 1301 can be within multiple ranges such as 1 mm-1.5 mm, 1.5 mm-2.5 mm, and 1.3 mm-2 mm. For example, the width of the flow guide 1301 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, and 2.4 mm, including but not limited to the listed values. Values ​​not listed within the above ranges are still applicable and can be selected according to actual needs.

[0099] Based on this, the depth of the flow guide 1301 is 1.5mm to 2.5mm. Similarly, a depth greater than 2.5mm would significantly reduce the structural strength of the first insulating member 130, while a depth less than 1.5mm would fail to effectively contain the molten material. The depth of the flow guide 1301 can be within multiple ranges, such as 1.5mm-2mm, 2-2.5mm, and 1.8mm-2.2mm. For example, the depth of the flow guide 1301 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, and 2.5mm, including but not limited to the listed values. Values ​​not listed within the above ranges are still applicable and can be selected according to actual needs.

[0100] Furthermore, in this embodiment, the bottom wall of the flow guide trough 1301 gradually slopes towards the cover plate 120 from one end near the fusible portion 113 to the other. That is, the bottom wall of the flow guide trough 1301 gradually slopes downward from one end near the fusible portion 113 to the other. In this way, the flow guide trough 1301 can achieve a better flow guiding effect, and the molten material can flow rapidly along the flow guide trough 1301 towards the opening located on the side of the first insulating member 130 under the action of gravity, thereby allowing the molten material to be quickly discharged.

[0101] The remaining structures and connections in the second and third embodiments are the same as those in the foregoing embodiments, and therefore will not be repeated here.

[0102] The aforementioned terminal post 110, top cover assembly 100, and battery cell 10 all have at least two second connecting portions 112 of the terminal post 110 spaced apart along a predetermined direction, i.e., the width direction of the housing 200. Therefore, the tabs 311 extending from at least two sets of cells 310 in the cell assembly 300 correspond to the positions of at least two second connecting portions 112. When welding the terminal post 110 to the cell assembly 300, the tabs 311 of each set of cells 310 can be directly welded to their corresponding second connecting portions 112, thus eliminating the need for adapters. Furthermore, when a battery cell 10 malfunctions, the fusible link between the first connecting portion 111 and the second connecting portion 112 is prone to melting, thereby cutting off the circuit. Therefore, the aforementioned terminal post 110, top cover assembly 100, and battery cell 10 can ensure safety without requiring adapters.

[0103] 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.

[0104] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A pole, characterized in that: It includes a first connection part, a second connection part and a fuse part, at least two of the second connection parts are arranged at intervals along a preset direction, the first connection part is electrically connected to each of the second connection parts through the fuse part, in the thickness direction of the pole, the orthographic projection of the first connection part and the orthographic projection of the second connection part do not overlap, the first connection part is used to connect the electrical connector, and the second connection part is used to connect the pole ear.

2. The pole according to claim 1, characterized in that: The first connection portion is disposed between the two second connection portions, and the first connection portion is electrically connected to the two second connection portions through the two fuse portions, respectively.

3. The pole according to claim 1, characterized in that: The first connecting portion has a third surface formed on one side along the thickness direction of the pole, the first connecting portion has a first surface opposite to the third surface formed on the other side along the thickness direction of the pole, and the second connecting portion and the fuse portion are located on the side of the third surface close to the first surface.

4. The pole according to claim 1, characterized in that: The fuse part has a hollow structure, and the hollow structure penetrates the fuse part along the thickness direction of the pole.

5. The pole according to claim 4, characterized in that: The first connecting portion is formed with a third surface on one side along the thickness direction of the pole, and the first connecting portion is formed with a first surface opposite to the third surface on the other side along the thickness direction of the pole, and the hollow structure is at least partially narrowed from the side close to the first surface to the side close to the third surface.

6. The pole according to claim 4, characterized in that: The hollow structure includes a strip-shaped hole, which is located in the middle of the fuse part and extends along the length direction of the fuse part.

7. The pole according to claim 4, characterized in that: The hollow structure includes a plurality of second through holes, and the plurality of second through holes are arranged at intervals along the length direction of the fuse part.

8. The pole according to claim 4, characterized in that: The hollow structure includes notches located at both side edges of the fuse portion in the length direction.

9. The pole according to claim 1, characterized in that: The fuse portion is formed with a thinning structure on at least one side along the thickness direction of the pole.

10. The pole according to claim 1, characterized in that: The flow area of ​​the fuse is 6 mm² to 24 mm².

11. The pole according to any one of claims 1 to 10, characterized in that: The pole includes a first metal layer and a second metal layer stacked along the thickness direction; the first metal layer and the second metal layer both extend to the first connecting portion and at least two of the second connecting portions; or, the first metal layer extends to the first connecting portion and at least two of the second connecting portions, and the second metal layer is located at at least two of the second connecting portions.

12. A top cover assembly, characterized in that: It comprises a cover plate, a first insulating member and a pole as claimed in any one of claims 1 to 11, wherein the cover plate is provided with a first through hole, the first connecting portion is mounted on a first side of the cover plate, at least two of the second connecting portions extend from the first through hole to a second side of the cover plate, and at least a portion of the first insulating member is arranged between the cover plate and the pole.

13. The top cover assembly according to claim 12, characterized in that: Each of the poles corresponds to at least two of the first through holes spaced apart along the preset direction, and at least two of the second connecting portions are respectively disposed in at least two of the first through holes.

14. The top cover assembly according to claim 12, characterized in that: When the fuse part has a hollow structure, the hollow structure penetrates the fuse part along the thickness direction of the pole, and the first insulating member fills at least part of the hollow structure; when the fuse part has a thinning structure formed on at least one side along the thickness direction of the pole, the first insulating member fills at least part of the thinning structure.

15. The top cover assembly according to claim 14, characterized in that: The first insulating member includes a first insulating portion and a third insulating portion, the first insulating portion is arranged between the cover plate and the first connecting portion, the third insulating portion fills at least a portion of the hollow structure or at least a portion of the thinned structure, and the third insulating portion is connected to the first insulating portion.

16. The top cover assembly according to claim 12, characterized in that: The first insulating member covers at least a portion of the fuse.

17. The top cover assembly according to claim 16, characterized in that The thickness of the portion of the first insulating member covering the fuse portion is greater than or equal to 0.5 mm.

18. The top cap assembly of claim 12, wherein the first insulating member does not cover the fuse portion.

19. The top cover assembly according to claim 12, characterized in that: A receiving groove is formed on one side of the cover plate facing the first connecting portion and corresponding to the position of the fuse portion.

20. The top cover assembly according to claim 19, characterized in that The depth of the receiving groove is 0.3 mm to 0.7 mm.

21. The top cover assembly according to claim 19, characterized in that The first insulating member extends between the fuse portion and the accommodating groove.

22. The top cover assembly according to claim 21, characterized in that The thickness of the portion of the first insulating member extending between the fuse part and the accommodation groove is 0.1 mm to 0.5 mm.

23. The top cover assembly according to claim 19, characterized in that The first insulating member forms a space-avoiding structure between the fuse part and the accommodating groove.

24. The top cover assembly according to claim 12, characterized in that The first insulating member is provided with a guide groove, one end of the guide groove extends to the fuse part, and the opening of the other end is located on the side of the first insulating member.

25. The top cover assembly according to claim 24, characterized in that The width of the guide groove is 1 mm to 2.5 mm, and / or the depth of the guide groove is 1.5 mm to 2.5 mm.

26. The top cover assembly according to claim 24, characterized in that In a direction from one end close to the fuse portion to the other end, the bottom wall of the guide groove gradually inclines toward the cover plate.

27. A battery cell, characterized in that: It comprises a shell, a battery cell assembly and a top cover assembly as described in any one of claims 12 to 26; the shell is open at at least one end, the battery cell assembly is accommodated in the shell, the top cover assembly covers the opening, and the width direction of the shell is consistent with the preset direction; the battery cell assembly comprises at least two groups of battery cells arranged in parallel along the width direction of the shell, and at least two groups of battery cells are arranged in a one-to-one correspondence with at least two second connecting parts, and the end face of each group of battery cells extends a pole ear, and the pole ear of each group of battery cells is respectively connected to the corresponding second connecting part.

28. A battery, characterized in that: The battery cell comprises a plurality of battery cells as claimed in claim 27, wherein the plurality of battery cells are electrically connected via an electrical connector, and the electrical connector is connected to the first connecting portion.

29. An electrical device, characterized in that: Comprising the battery cell as claimed in claim 27 or the battery as claimed in claim 28.

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