Pole, battery cell, battery, and electric device

Abstract

The utility model relates to a kind of pole, battery monomer, battery and electric device, pole includes the tab connecting portion, fuse portion and outer connecting column sequentially arranged along first direction, tab connecting portion is used to be electrically connected with tab, outer connecting column is used to be electrically connected with external electrical connector, fuse portion is connected between tab connecting portion and outer connecting column for fuse protection;Pole further includes insulation portion, insulation portion is located between tab connecting portion and outer connecting column along first direction, insulation portion is annularly arranged outside fuse portion around first axis, tab connecting portion, insulation portion and outer connecting column form accommodating cavity jointly.No longer need to open in tab connecting portion to reduce the cross-sectional area of tab connecting portion as fuse protection mechanism, the structural strength of tab connecting portion can be guaranteed, and tearing risk is reduced.Liquid metal formed after fuse portion melts can be accommodated in accommodating cavity, to avoid liquid metal flows to battery assembly, plays the role of protecting battery assembly.

Description

Technical Field

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

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing. As a result, the application of power batteries, the core component of new energy vehicles, is becoming increasingly widespread in people's lives.

[0003] Currently, the terminals and tabs of a battery cell are connected by an adapter plate, and the fuse protection mechanism is located on the adapter plate. This is achieved by reducing the cross-sectional area of ​​the adapter plate through an opening, serving as a current-critical fuse. However, the adapter plate is generally thin, and openings in it result in insufficient structural strength, posing a risk of tearing and reducing structural reliability. Furthermore, when the fuse protection mechanism melts, metal can easily flow into the battery cell assembly, potentially damaging it. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the traditional fuse protection mechanism design results in low structural reliability and easy damage to the battery cell assembly, and to provide a terminal post, battery cell, battery, and power device that can improve structural reliability and reduce the risk of damage to the battery cell assembly.

[0005] On one hand, this application provides an electrode post, which includes an electrode tab connection part, a fuse part and an external connection post arranged sequentially along a first direction. The electrode tab connection part is used for electrical connection with an electrode tab, the external connection post is used for electrical connection with an external electrical connector, and the fuse part is connected in series between the electrode tab connection part and the external connection post for fuse protection.

[0006] The electrode post further includes an insulating portion, which is disposed between the electrode tab connection portion and the outer connecting post along the first direction. The insulating portion is arranged in a ring around the first axis outside the fuse portion. The first axis extends along the first direction. The electrode tab connection portion, the insulating portion, and the outer connecting post together form a receiving cavity.

[0007] In one embodiment, the longitudinal cross-sectional shape of the fuse portion is I-shaped;

[0008] and / or

[0009] The tab connection, the fusion break, and the outer connecting post are integrally formed.

[0010] In one embodiment, the fuse portion is made of the same material as the outer connecting post and the electrode connecting portion;

[0011] or

[0012] The melting point of the fuse is lower than that of the outer connecting post and the electrode connecting part.

[0013] In one embodiment, the fuse portion has a first end face connected to the outer connecting post and a second end face connected to the electrode connecting portion, and the outer connecting post has a third end face facing the electrode connecting portion;

[0014] The dimensions L1 of the first end face and the second end face in the second direction satisfy the relationship L2 of the third end face in the second direction: 1 / 3L2≤L1≤2 / 3L2; the second direction intersects the first direction;

[0015] and / or

[0016] The fusible part has a first thickness D along the first direction, and the outer connecting post, the fusible part and the electrode connecting part have a thickness D1 along the first direction, where 1 / 3D1≤D≤1 / 2D1.

[0017] In one embodiment, the fusible portion has a first connecting segment, a fusible segment, and a second connecting segment connected sequentially along the first direction. The first connecting segment is connected to the outer connecting post, and the second connecting segment is connected to the electrode connecting portion. The dimension L3 of the fusible segment in the second direction is smaller than the dimensions of the first connecting segment and the second connecting segment in the second direction, and L3 satisfies the following relationship:

[0018]

[0019] Wherein, the second direction intersects with the first direction, I0 is the maximum current of the battery cell under normal operation, I is the maximum current that the battery cell can withstand, t is the overcurrent time, and ρ, C, ω and T are the resistivity, specific heat capacity, density and melting point of the material used in the fuse part, respectively.

[0020] In one embodiment, the first connecting segment has a first end face connected to the outer connecting post, and the second connecting segment has a second end face connected to the tab connecting portion;

[0021] The dimensions L1 of the first end face and the second end face in the second direction and the dimension L3 of the fused segment in the second direction satisfy the relationship: 1 / 2L1≤L3≤L1.

[0022] In one embodiment, the external connecting post, the fusible portion, and the insulating portion are coaxially arranged.

[0023] On the other hand, this application also provides a battery cell, the battery cell including a top cover assembly and a cell assembly, the top cover assembly including a cover plate and a positive terminal and a negative terminal mounted on the cover plate, and the cell assembly including tabs;

[0024] At least one of the positive terminal and the negative terminal is the terminal described above, and the positive terminal and the negative terminal are electrically connected to the corresponding tab.

[0025] Furthermore, this application also provides a battery, including the aforementioned battery cell.

[0026] In another aspect, this application also provides an electrical device, including the aforementioned battery cell, or including the aforementioned battery.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] Since the fusible link is located between the outer connecting post and the tab connection, compared to existing technologies, it eliminates the need for an opening in the tab connection to reduce its cross-sectional area, thus ensuring the structural strength of the tab connection, reducing the risk of tearing, and improving structural reliability. An insulating part surrounds the fusible link, and the tab connection, insulating part, and outer connecting post together form a receiving cavity. The liquid metal formed after the fusible link melts can be contained within this cavity. The insulating part restricts the flow of the molten liquid metal, preventing it from flowing into the battery cell assembly and protecting it. Furthermore, the insulating part is located between the outer connecting post and the tab connection, meaning that the outer connecting post and the tab connection are connected not only through the fusible link but also through the insulating part. This insulating part compensates for the potential strength deficiency that might occur when the tab connection and outer connecting post are only connected by the fusible link, enhancing the connection strength between them. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a battery cell provided in an embodiment of this application;

[0030] Figure 2 for Figure 1 An exploded view of a single battery cell shown;

[0031] Figure 3 for Figure 1 An exploded view of the top cover assembly of the battery cell shown.

[0032] Figure 4 for Figure 3 The diagram shows the structure of the pole of the top cover assembly;

[0033] Figure 5 for Figure 4An exploded view of the pole shown;

[0034] Figure 6 for Figure 4 A cross-sectional view of the AA surface of the pole shown;

[0035] Figure 7 for Figure 6 A magnified view of a portion of the pole shown.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1000, Battery cell; 2000, Cell assembly; 2001, Tab; 3000, Top cover assembly; 100, Terminal post; 100a, Positive terminal post; 100b, Negative terminal post; 10, Tab connection part; 11, Fourth end face; 20, Fusible part; 21, First end face; 22, Second end face; 23, First connecting section; 24, Fusible section; 25, Second connecting section; 30, External connecting post; 31, Third end face; 40, Insulating part; 50, Receiving cavity; 200, Cover plate; 300, Insulating component; Z, First direction; X, Second direction. Detailed Implementation

[0038] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model 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 full understanding of this utility model. However, this utility model 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 utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0040] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this utility model, unless otherwise explicitly 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] 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.

[0044] See Figure 1This application provides an electrical device, a battery, and a battery cell 1000. The electrical device includes a battery or a battery cell 1000 and is capable of providing electrical energy from the battery or battery cell 1000. 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.

[0045] 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.

[0046] 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 1000. The multiple battery cells 1000 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 1000. Alternatively, the multiple battery cells 1000 can first be combined with a module management system to form a battery module, and then the multiple 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.

[0047] Multiple battery cells 1000 can be mounted on supporting structures such as housings, frames, and brackets. The individual battery cells 1000 and the battery management system can be electrically connected via electrical connectors, such as busbars. The battery cells 1000 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 battery cell 1000 is a lithium-ion square battery.

[0048] See Figure 1 and Figure 2In one embodiment of this application, the battery cell 1000 includes a housing (not shown) and a cell assembly 2000. The housing is a hollow structure with an internal cavity for housing the cell assembly 2000, electrolyte, and other components. The cavity has an opening through which the cell assembly 2000 is inserted into the housing. Since the battery cell 1000 in this embodiment is a prismatic battery, the outer contour of the housing is cuboid, and its opening is rectangular. The battery cell 1000 also includes a top cover assembly 3000, which is mounted on the housing and covers its opening, thereby creating a relatively closed environment inside the housing to isolate the cell assembly 2000 from the external environment. Since the shape of the top cover assembly 3000 needs to be adapted to the shape of the opening, the top cover assembly 3000 is generally rectangular.

[0049] The cell assembly 2000 is the core component of the battery cell 1000. To fit the shape of the casing, the cell assembly 2000 in this embodiment is approximately cuboid in shape. The cell assembly 2000 can be arranged in one group or multiple groups side-by-side along the first thickness direction of the casing; this is not limited here. Each group of cell assemblies 2000 has a tab 2001 on the side facing the top cover assembly 3000. Specifically, each group of cell assemblies 2000 has a positive tab and a negative tab facing the top cover assembly 3000. The positive tabs of all cell assemblies 2000 are connected to form the positive tab of the battery cell 1000, and the negative tabs are connected to form the negative tab of the battery cell 1000.

[0050] See Figure 2 and Figure 3 The top cover assembly 3000 includes a cover plate 200 and a positive terminal 100a and a negative terminal 100b mounted on the cover plate 200. For ease of understanding, this article uses one of the terminals 100 as an example. That is, in this article, "terminal 100" can be either the positive terminal 100a or the negative terminal 100b, and "tab 2001" can be either the positive tab or the negative tab, as long as the tab 2001 connected to the positive terminal 100a is the positive tab and the tab 2001 connected to the negative terminal 100b is the negative tab.

[0051] In some embodiments, see Figures 4-6The terminal 100 includes a tab connection portion 10, a fuse portion 20, and an external connecting post 30 arranged sequentially along a first direction Z. Specifically, the first direction Z is parallel to the second thickness direction of the cover plate 200 and perpendicular to the first thickness direction of the housing. The tab connection portion 10 is used for electrical connection with the tab 2001, the external connecting post 30 is used for electrical connection with an external electrical connector, and the fuse portion 20 is connected in series between the tab connection portion 10 and the external connecting post 30 for fuse protection. The terminal 100 serves as a terminal of the battery cell 1000, and can connect the terminals of each battery cell 1000 using an external electrical connector to achieve series, parallel, or mixed series and parallel electrical connections of the battery cells 1000. The fuse portion 20 uses a metal conductor as a fusible element connected in series between the tab connection portion 10 and the external connecting post 30. When the overload or short-circuit current exceeds its current-carrying design, it melts due to its own heating, thereby breaking the circuit.

[0052] Since the fuse part 20 is located between the outer connecting post 30 and the tab connecting part 10, compared with the prior art, it is no longer necessary to open the tab connecting part 10 to reduce the cross-sectional area of ​​the tab connecting part 10 as a fuse protection mechanism. This can ensure the structural strength of the tab connecting part 10, reduce the risk of tearing, and thus improve the reliability of the structure.

[0053] Further reading Figure 6 and Figure 7 The electrode post 100 also includes an insulating portion 40, which is disposed between the electrode tab connection portion 10 and the outer connecting post 30 along a first direction Z. The insulating portion 40 is arranged in a ring around the fuse portion 20, which extends along the first direction Z. The electrode tab connection portion 10, the insulating portion 40, and the outer connecting post 30 together form a receiving cavity 50. It should be noted that the first axis is a straight line extending along the first direction Z. This straight line may or may not pass through the fuse portion 20, and is not limited here.

[0054] The above configuration has two aspects. First, the insulating part 40 surrounds the fuse part 20, and the tab connection part 10, the insulating part 40, and the outer connecting post 30 together form a receiving cavity 50. The liquid metal formed after the fuse part 20 melts can be contained in the receiving cavity 50. That is, the insulating part 40 can restrict the flow of the liquid metal formed after melting, so as to prevent the liquid metal from flowing to the battery cell assembly 2000, thus protecting the battery cell assembly 2000. Second, the insulating part 40 is located between the outer connecting post 30 and the tab connection part 10. That is, the outer connecting post 30 and the tab connection part 10 are connected not only through the fuse part 20, but also through the insulating part 40. The insulating part 40 can make up for the possible insufficient strength problem that the tab connection part 10 and the outer connecting post 30 may be connected only through the fuse part 20, and enhance the connection strength between the tab connection part 10 and the outer connecting post 30.

[0055] It should be noted that the insulating part 40 surrounds the fuse part 20 and is disposed between the electrode connection part 10 and the outer connecting post 30 along the first direction Z. This makes the cross-sectional area of ​​the fuse part 20 smaller than the cross-sectional area of ​​the outer connecting post 30. When the cross-sectional area of ​​the fuse part 20 is smaller, it can also reduce the weight of the electrode post 100, thereby increasing the energy density.

[0056] It should be noted that the cross section is the first cutting surface formed by cutting the corresponding component through a first plane perpendicular to the first direction Z, and the cross-sectional area is the area of ​​the first cutting surface.

[0057] Optionally, the insulating part 40 is made of heat-resistant insulating material, which not only provides insulation but also has strong heat resistance to prevent the liquid metal formed by the melting of the fusible part 20 from flowing to the insulating part 40 and burning it, thus providing good protection for the battery cell assembly 2000.

[0058] In some embodiments, the insulating part 40, the outer connecting post 30, and the electrode connecting part 10 can be fixed by adhesive. In other embodiments, one of the insulating part 40 and the outer connecting post 30 has a groove, and the other has a protrusion. The protrusion is embedded in the groove to achieve the connection and fixation of the insulating part 40 and the outer connecting post 30. The connection and fixation of the insulating part 40 and the electrode connecting part 10 is also done in the same way.

[0059] It is conceivable that in other embodiments, the insulating part 40 may also be connected and fixed to the outer connecting post 30 and the electrode connecting part 10 in other ways, which are not limited here.

[0060] Further reading Figure 3 The top cover assembly 3000 also includes an insulating component 300, which is disposed between the cell assembly 2000 and the cover plate 200. To facilitate the assembly of the terminal post 100, the insulating component 300 has a receiving groove on the side facing away from the cover plate 200. The cover plate 200 and the insulating component 300 together form a terminal post hole. The electrode tab connection part 10 is embedded in the receiving groove in a sheet shape. The insulating part 40, the fuse part 20, and the external connecting post 30 pass through the terminal post hole. This arrangement not only facilitates the assembly of the terminal post 100, but also prevents the terminal post 100 from occupying too much space inside the casing, thereby improving the space utilization rate inside the battery cell 1000.

[0061] In some embodiments, the tab connection 10, the fuse 20, and the outer connecting post 30 are integrally formed to reduce the number of interconnection steps between the fuse 20, the tab connection 10, and the outer connecting post 30, thereby avoiding the problem of insufficient reliability caused by poor connection at the connection position.

[0062] It is conceivable that in some other embodiments, the fuse part 20 and the tab connection part 10 or the fuse part 20 and the outer connecting post 30 may also be fixed by means of welding, bolt connection or other methods.

[0063] The material of the fuse part 20 can be set as follows:

[0064] 1. The fuse part 20 is made of the same material as the external connecting post 30 and the electrode connecting part 10. When the fuse part 20, external connecting post 30, and electrode connecting part 10 are made of the same material, the cross-sectional area of ​​the fuse part 20 is smaller, so that when current flows, the resistance on the fuse part 20 is greater than the resistance on the electrode connecting part 10 and the external connecting post 30. When there is an overcurrent or short circuit, the temperature rises faster to the point of melting, thus achieving fuse protection. This design avoids the problem of inconvenience in connecting dissimilar metals.

[0065] In some embodiments, the electrode 100 is a negative electrode 100b, and the tab connection 10, the external connection post 30, and the fuse part 20 are all made of copper. In other embodiments, the electrode 100 is a positive electrode 100a, and the tab connection 10, the external connection post 30, and the fuse part 20 are all made of aluminum. Of course, in other embodiments, the materials of the tab connection 10, the external connection post 30, and the fuse part 20 are selected according to needs and are not limited here.

[0066] 2. The fusible link 20 is made of a different material than the outer connecting post 30 and the tab connecting part 10. Specifically, the melting point of the fusible link 20 is lower than that of the outer connecting post 30 and the tab connecting part 10. When the melting point of the fusible link 20 is lower, damage to the tab connecting part 10 and the outer connecting post 30 itself can be avoided.

[0067] In some embodiments, see further reference. Figure 6 and Figure 7 The fusible portion 20 has a first end face 21 connected to the outer connecting post 30 and a second end face 22 connected to the electrode connecting portion 10. The outer connecting post 30 has a third end face 31 facing the electrode connecting portion 10. The dimensions L1 of the first end face 21 and the second end face 22 in the second direction X, and the dimension L2 of the third end face 31 in the second direction X, satisfy the following relationship:

[0068] 1 / 3L2≤L1≤2 / 3L2.

[0069] When L1 is small, the connection strength between the fuse part 20, the electrode connection part 10, and the outer connecting post 30 cannot be guaranteed. When L1 is large, there is not enough space to reserve for the installation of the insulation part 40. By setting 1 / 3L2≤L1≤2 / 3L2, the connection strength between the fuse part 20, the electrode connection part 10, and the outer connecting post 30 can be guaranteed, while also leaving enough space for the installation of the insulation part 40. This ensures that the volume of the insulation part 40 and the receiving cavity 50 both meet the requirements, thereby improving the protection effect on the battery cell assembly 2000.

[0070] Specifically, the second direction X intersects the first direction Z, and is perpendicular to the first direction Z. Since the first direction Z is parallel to the second thickness direction of the cover plate 200, the second direction X intersects the second thickness direction.

[0071] Optionally, the cross-sectional shape of the fuse portion 20 and the outer connecting post 30 is circular. In this case, the second direction X is any radial direction of the circle, L1 is the diameter of the first end face 21 and the second end face 22, and L2 is the diameter of the third end face 31.

[0072] Specifically, the external connecting post 30, the fusible link 20, and the insulating part 40 are coaxially arranged. This not only simplifies the structural arrangement but also ensures that there are gaps between the insulating part 40 and the fusible link 20 at all points, so as to accommodate the liquid metal formed after the fusible link 20 melts. Of course, in some other embodiments, the external connecting post 30, the fusible link 20, and the insulating part 40 may be non-coaxially arranged, which is not limited here.

[0073] In some embodiments, see further reference. Figure 6 The fusible portion 20 has a first connecting segment 23, a fusible segment 24, and a second connecting segment 25 connected sequentially along a first direction Z. The first connecting segment 23 is connected to the outer connecting post 30, and the second connecting segment 25 is connected to the electrode connecting portion 10. The dimension L3 of the fusible segment 24 in the second direction X is smaller than the dimensions of the first connecting segment 23 and the second connecting segment 25 in the second direction X. A first end face 21 is formed on the first connecting segment 23, and a second end face 22 is formed on the second connecting segment 25.

[0074] Since the fusible section 20 performs the fusing function at the position with the smallest cross-sectional area, setting the dimension L3 of the fusible section 24 in the second direction X to be smaller than the dimensions of the first connecting section 23 and the second connecting section 25 in the second direction X can make the cross-sectional area of ​​the fusible section 24 smaller, so that it can be fused from that position.

[0075] Specifically, L3 satisfies the following relationship:

[0076]

[0077] Where I0 is the maximum current of the battery cell 1000 under normal operation, I is the maximum current that the battery cell 1000 can withstand, t is the overcurrent time, and ρ, C, ω and T are the resistivity, specific heat capacity, density and melting point of the material used in the fuse part 20, respectively.

[0078] When L3 satisfies the above relationship, it can ensure that the fuse section 24 can be melted when the current is too large without affecting the normal operation of the battery cell 1000.

[0079] Preferably, 1 / 2L1≤L3≤L1, so as to further ensure that the fuse segment 24 melts and provides good fuse protection when the current is too large.

[0080] For some specific implementation methods, please refer to [link / reference]. Figure 7 The longitudinal cross-sectional shape of the fuse section 20 is I-shaped. It should be noted that the longitudinal cross-section is a second cutting surface formed by cutting the corresponding component through a second plane perpendicular to the second direction X.

[0081] Since the fusing part 20 functions as a fuser at the position with the smallest cross-sectional area, when the longitudinal cross-sectional shape of the fusing part 20 is I-shaped, the middle position of the fusing part 20 is the position with the smallest cross-sectional area, so that it can be fused from this position. Furthermore, the cross-sectional areas at both ends of the I-shape are larger and the cross-sectional area in the middle is smaller, which saves material while ensuring the connection strength between the two ends of the fusing part 20 and the electrode connecting part 10 and the outer connecting post 30, respectively.

[0082] Of course, in other embodiments, the shape of the fuse portion 20 is not limited. For example, the fuse portion 20 can also be cylindrical, in which case the longitudinal cross-section of the fuse portion 20 is rectangular.

[0083] In some embodiments, see further reference. Figure 7 The fusible part 20 has a first thickness D along the first direction Z, and the outer connecting post 30, the fusible part 20 and the electrode connecting part 10 have a thickness D1 along the first direction Z, where 1 / 3D1≤D≤1 / 2D1.

[0084] Because a small value for D increases assembly difficulty and affects structural stability, while a large value for D may affect structural strength or increase costs, a suitable range is maintained by setting 1 / 3D1 ≤ D ≤ 1 / 2D1. This ensures that D is within a reasonable range, simplifying assembly, maintaining structural stability, guaranteeing structural strength, and reducing costs.

[0085] 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.

[0086] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode post, characterized in that, The pole includes a tab connection part (10), a fuse part (20), and an external connection post (30) arranged sequentially along a first direction (Z). The tab connection part (10) is used to electrically connect with the tab (2001), the external connection post (30) is used to electrically connect with an external electrical connector, and the fuse part (20) is connected in series between the tab connection part (10) and the external connection post (30) for fuse protection. The pole post also includes an insulating part (40), which is disposed between the tab connection part (10) and the outer connecting post (30) along the first direction (Z). The insulating part (40) is arranged in a ring around the fuse part (20) around the first axis, which extends along the first direction (Z). The tab connection part (10), the insulating part (40), and the outer connecting post (30) together form a receiving cavity (50).

2. The pole post according to claim 1, characterized in that, The longitudinal cross-sectional shape of the fuse section (20) is I-shaped; and / or The tab connection (10), the fuse (20), and the outer connecting post (30) are integrally formed.

3. The pole post according to claim 1, characterized in that, The fusible part (20) is made of the same material as the outer connecting post (30) and the electrode connecting part (10); or The melting point of the fuse (20) is lower than that of the outer connecting post (30) and the tab connecting part (10).

4. The pole post according to claim 1, characterized in that, The fuse part (20) has a first end face (21) connected to the outer connecting post (30) and a second end face (22) connected to the electrode connecting part (10), and the outer connecting post (30) has a third end face (31) facing the electrode connecting part (10); The dimensions L1 of the first end face (21) and the second end face (22) in the second direction (X) and the dimension L2 of the third end face (31) in the second direction (X) satisfy the following relationship: 1 / 3L2≤L1≤2 / 3L2; the second direction (X) intersects the first direction (Z); and / or The fusible part (20) has a first thickness D along the first direction (Z), and the outer connecting post (30), the fusible part (20) and the tab connecting part (10) have a thickness D1 along the first direction (Z), where 1 / 3D1≤D≤1 / 2D1.

5. The pole post according to claim 1, characterized in that, The fusible link (20) has a first connecting segment (23), a fusible link (24), and a second connecting segment (25) connected sequentially along the first direction (Z). The first connecting segment (23) is connected to the outer connecting post (30), and the second connecting segment (25) is connected to the tab connecting part (10). The dimension L3 of the fusible link (24) in the second direction (X) is smaller than the dimensions of the first connecting segment (23) and the second connecting segment (25) in the second direction (X). L3 satisfies the following relationship: Wherein, the second direction (X) intersects with the first direction (Z), I0 is the maximum current for normal operation of the battery cell, I is the maximum current that the battery cell can withstand, t is the overcurrent time, and ρ, C, ω and T are the resistivity, specific heat capacity, density and melting point of the material used in the fuse part (20), respectively.

6. The pole post according to claim 5, characterized in that, The first connecting segment (23) has a first end face (21) connected to the outer connecting post (30), and the second connecting segment (25) has a second end face (22) connected to the tab connecting part (10); The dimensions L1 of the first end face (21) and the second end face (22) in the second direction (X) and the dimensions L3 of the fused segment (24) in the second direction (X) satisfy the relationship: 1 / 2L1≤L3≤L1.

7. The pole post according to claim 1, characterized in that, The external connecting post (30), the fusible part (20), and the insulating part (40) are coaxially arranged.

8. A single battery cell, characterized in that, The battery cell includes a top cover assembly (3000) and a cell assembly (2000). The top cover assembly (3000) includes a cover plate (200) and a positive terminal (100a) and a negative terminal (100b) mounted on the cover plate (200). The cell assembly (2000) includes a tab (2001). At least one of the positive terminal (100a) and the negative terminal (100b) is a terminal as described in any one of claims 1-7, and the positive terminal (100a) and the negative terminal (100b) are electrically connected to the corresponding tab (2001).

9. A battery, characterized in that, Includes the battery cell as described in claim 8.

10. An electrical appliance, characterized in that, It includes the battery cell as described in claim 8, or the battery as described in claim 9.

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