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

Abstract

The utility model relates to a pole column, a top cover assembly, a battery monomer, a battery and an electric device, comprising a first connecting part which is electrically connected with an electric connecting piece; the at least two second connecting parts are arranged at intervals in the first direction, and each second connecting part is connected with the first connecting part; wherein each second connecting part comprises a side wall and a bottom wall which are connected with each other, the side wall is arranged around the periphery of the bottom wall, the side wall extends towards one side of the first thickness direction of the bottom wall, and the side wall and the bottom wall jointly form a first groove; the surface, far away from the side wall, of the bottom wall is used for being electrically connected with a tab, and the first connecting part is connected with the first end surface, far away from the bottom wall, of the side wall; the first direction intersects the first thickness direction.

Description

Technical Field

[0001] This utility model 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] Lithium-ion batteries are characterized by high energy density, long cycle life, and environmental friendliness, and are widely used in modern electronic products and electric vehicles. The individual battery cell is a crucial component of the battery.

[0003] In a battery cell, the terminal post is mounted on a cover plate, and the tabs of the cell are connected to the terminal post, which serves as the electrode terminal of the battery cell. The terminal post includes a first connecting part and two second connecting parts. The first connecting part is connected to an external electrical connector, and at least two second connecting parts are spaced apart along the width direction of the cover plate. Each second connecting part passes through a through hole in the cover plate and is connected to the tab.

[0004] In related technologies, the second connection portion often features a flanged structure, with the first connection portion connected to the flanged structure. The flanged structure presses the sealing ring onto the outer surface of the cover plate. The flanged structure results in the second connection portion occupying a significant amount of space in the width direction of the cover plate. Therefore, for cover plates with a narrow width, the first connection portion needs to extend along the length direction of the cover plate to accommodate the second connection portion. This increases the material used in the terminal post, raising its manufacturing cost. Furthermore, given a fixed cover plate width, the flanged structure also reduces the current-carrying area of ​​the second connection portion, negatively impacting the battery cells. Utility Model Content

[0005] Therefore, it is necessary to provide a terminal post, top cover assembly, battery cell, battery, and power device that can reduce the manufacturing cost of the terminal post and increase the current flow area, in order to address the above problems.

[0006] On the one hand, this application provides a pole post, comprising:

[0007] The first connecting part is used for electrical connection with the electrical connector;

[0008] At least two second connecting portions are spaced apart along a first direction, and each second connecting portion is connected to the first connecting portion;

[0009] Each of the second connecting portions includes a sidewall and a bottom wall that are connected to each other. The sidewall is disposed around the periphery of the bottom wall and extends toward the first thickness direction of the bottom wall. The sidewall and the bottom wall together form a first groove. The surface of the bottom wall away from the sidewall is used for electrical connection with the tab. The first connecting portion is connected to the first end face of the sidewall away from the bottom wall. The first direction intersects the first thickness direction.

[0010] In one embodiment, the dimension of the bottom wall along the first thickness direction is less than or equal to the dimension of the first connecting portion along the first thickness direction.

[0011] In one embodiment, the first connecting portion has a first surface and a second surface disposed opposite to each other along the first thickness direction, and the second surface is disposed close to the bottom wall relative to the first surface;

[0012] The first end face is located on the side of the second surface away from the first surface.

[0013] In one embodiment, the sidewall has a first wall and a second wall spaced apart along the first direction, the first wall being connected to the first connecting portion;

[0014] The dimension of the first wall along the first direction is greater than or equal to the dimension of the second wall along the first direction.

[0015] In one embodiment, the pole post includes a transition portion, which corresponds one-to-one with the second connecting portion, and the first connecting portion is connected to each of the first end faces through the corresponding transition portion.

[0016] In one embodiment, the first connecting portion has a first surface and a second surface disposed opposite to each other along the first thickness direction, and the second surface is disposed close to the bottom wall relative to the first surface;

[0017] One end of the transition portion is connected to the second surface, and the other end is connected to the first end face.

[0018] In one embodiment, the sidewall has a first wall and a second wall spaced apart along the first direction, the first wall being connected to the first connecting portion;

[0019] The surface of the first wall near the first groove is flush with the side surface of the first connecting portion along the first direction.

[0020] In one embodiment, the sidewall has a first wall and a second wall spaced apart along the first direction, the first wall being connected to the first connecting portion;

[0021] The surface of the first wall away from the first groove transitions to the second surface with an arc.

[0022] In one embodiment, the first connecting portion and the pole post have a first size and a second size respectively along the first direction, and the ratio of the first size to the second size is in the range of a, where 20% ≤ a ≤ 60%.

[0023] In one embodiment, the transition portion includes a first segment and a second segment connected to each other, wherein the end of the first segment away from the second segment is connected to a side surface of the first connecting portion along the first direction, and the end of the second segment away from the first segment is connected to the first end face.

[0024] In one embodiment, the transition segment further includes a third segment that connects the first segment and the second segment, and the third segment is arc-shaped.

[0025] In one embodiment, the dimension of the transition portion along the second direction is smaller than the dimensions of the first connecting portion and the second connecting portion along the second direction;

[0026] or,

[0027] The transition portion is provided with a second groove or through hole along its thickness direction;

[0028] The first direction, the second direction, and the first thickness direction intersect each other.

[0029] In one embodiment, the included angle between the sidewall and the bottom wall is α, where 90°≤α≤95°.

[0030] In one embodiment, the first connecting portion includes a first body and a first protrusion. The first body is connected to the first end face, and the first protrusion protrudes along the first thickness direction at one end of the first body away from the sidewall. The projection of the first protrusion along the first thickness direction falls within the first body.

[0031] And / or,

[0032] The bottom wall includes a second body and a second protrusion. The side wall is connected to the second body. The second protrusion protrudes along the first thickness direction at one end of the second body away from the side wall. The projection of the second protrusion along the first thickness direction falls within the second body.

[0033] In one embodiment,

[0034] The second connection portion includes a first metal layer and a second metal layer, wherein the second metal layer covers the outer surface of the first metal layer;

[0035] The first metal layer includes a first bottom wall and a first side wall, and the second metal layer includes a second bottom wall and a second side wall. The first bottom wall and the second bottom wall are connected to form the bottom wall, and the first side wall and the second side wall are connected to form the side wall.

[0036] The first connecting portion is connected to the first metal layer and / or the second metal layer.

[0037] In one embodiment, the first metal layer and the second metal layer have a bonding interface that intersects with the first end face.

[0038] In one embodiment, the sidewall has a first wall and a second wall spaced apart along the first direction, the first wall being connected to the first connecting portion;

[0039] The second metal layer of the first wall has a second end face away from the bottom wall, and the second metal layer of the second wall has a third end face away from the bottom wall, with the second end face and the third end face being flush.

[0040] In one embodiment, the dimension of the second bottom wall along the first thickness direction is greater than or equal to the dimension of the second side wall along the first direction;

[0041] And / or,

[0042] The sidewall has a first wall and a second wall spaced apart along the first direction, the first wall being connected to the first connecting portion; the dimension of the second metal layer of the first wall along the first direction is greater than or equal to the dimension of the second metal layer of the second wall along the first direction.

[0043] And / or,

[0044] The dimension of the second bottom wall along the first thickness direction is d1, where 0.5mm≤d1≤2mm;

[0045] And / or,

[0046] The dimension of the second sidewall along the first direction is d2, 0.1mm≤d2≤1.6mm.

[0047] In one embodiment, the first connecting portion includes a third metal layer, which is connected to both the first metal layer and the second metal layer, and the first metal layer and the third metal layer are made of the same material.

[0048] or,

[0049] The first connecting portion includes a third metal layer and a fourth metal layer. The third metal layer is connected to the first metal layer, and the fourth metal layer is connected to the second metal layer. The third metal layer and the first metal layer are made of the same material, and the second metal layer and the fourth metal layer are made of the same material.

[0050] In one embodiment, the first metal layer is an aluminum layer and the second metal layer is a copper layer.

[0051] On the other hand, this application also provides a top cover assembly, including:

[0052] As described above, poles;

[0053] A cover plate has a third surface and a fourth surface disposed opposite to each other along the first thickness direction, and the cover plate is provided with a pole hole communicating with the third surface and the fourth surface;

[0054] The first connecting part is located on the side of the cover plate having the third surface, and the second connecting part is assembled into the pole hole.

[0055] In one embodiment, along the first thickness direction, the first connecting portion has a first projection, the second connecting portion has a second projection, and the pole hole has a third projection;

[0056] The third projection covers the second projection, and at least a portion of the first projection does not overlap with the third projection.

[0057] In one embodiment, along the first direction, the overlap dimension between the first projection and the third projection is L, where 0mm < L ≤ 10mm.

[0058] In one embodiment, the top cover assembly further includes a first insulating element disposed insulatingly between the pole and the cover plate.

[0059] In one embodiment, the pole and the cover plate are provided with nanopores, and at least a portion of the first insulating element is embedded in the nanopores.

[0060] In one embodiment, the first end face is flush with the third surface;

[0061] or,

[0062] The first end face is located on the side of the third surface closer to the first connecting portion, and the distance between the first end face and the third surface is less than or equal to 1.5 mm;

[0063] or,

[0064] The first end face is located on the side of the third surface away from the first connecting portion, and the distance between the first end face and the third surface is less than or equal to 1.5 mm.

[0065] In one embodiment, along the first thickness direction, the surface where the bottom wall connects to the side wall is located between the third surface and the fourth surface.

[0066] Furthermore, this application also provides a battery cell, including a casing, a cell assembly, and a top cover assembly as described above;

[0067] The housing has a receiving cavity with an opening, a cover plate is disposed on the opening, the battery cell assembly is disposed in the receiving cavity and has at least two tabs on the side facing the cover plate, and the bottom wall surface of each second connection portion away from the side wall is connected to the corresponding tab.

[0068] In another aspect, this application also provides a battery, including the battery cell as described above.

[0069] On the other hand, this application also provides an electrical device, including a battery cell as described above, or including a battery as described above.

[0070] Compared with the prior art, this application has the following beneficial effects:

[0071] In this application, the second connecting portion of the terminal block only includes a bottom wall and a side wall. Compared to the structure in the prior art, the second connecting portion in this application completely omits the flange structure. The second connecting portion, by omitting the flange structure, occupies a smaller dimension in the width direction of the cover plate. Even when the cover plate width is small, there is sufficient space between the second connecting portions to accommodate the first connecting portion, ensuring the current-carrying area of ​​the first connecting portion, while avoiding increasing the material used in the terminal block, thereby reducing the manufacturing cost of the terminal block. Furthermore, with a fixed cover plate width, completely eliminating the flange structure of the second connecting portion increases the current-carrying area of ​​the second connecting portion, thereby improving the battery's charging and discharging efficiency and heat dissipation performance. Moreover, since the side wall and bottom wall together form a first groove, the second connecting portion is essentially a hollow structure, saving material and reducing the weight of the terminal block. Attached Figure Description

[0072] Figure 1 This is a structural diagram of a battery cell provided in an embodiment of this application;

[0073] Figure 2 for Figure 1 An exploded view of a single battery cell shown;

[0074] Figure 3 for Figure 1 A top view of the battery cell shown;

[0075] Figure 4 for Figure 3 A cross-sectional view of the battery cell shown in section AA;

[0076] Figure 5 This is a structural diagram of a top cover assembly provided in one embodiment of this application;

[0077] Figure 6 for Figure 5 A top view showing the assembled components of the top cover assembly;

[0078] Figure 7 for Figure 6 BB section view of the top cover assembly shown;

[0079] Figure 8 A structural diagram of a pole provided in an embodiment of this application;

[0080] Figure 9 for Figure 8 A cross-sectional view of the pole shown;

[0081] Figure 10 A structural diagram of the pole provided in another embodiment of this application;

[0082] Figure 11 A cross-sectional view of a pole provided in yet another embodiment of this application;

[0083] Figure 12 A structural diagram of the pole provided in another embodiment of this application;

[0084] Figure 13 A cross-sectional view of a pole provided in yet another embodiment of this application;

[0085] Figure 14 A cross-sectional view of a pole provided in another embodiment of this application.

[0086] Explanation of reference numerals in the attached figures:

[0087] 1000, Battery cell; 100, Top cover assembly; 10, Terminal post; 10a, Positive terminal post; 10b, Negative terminal post; 11, First connecting part; 111, First body; 112, First protrusion; 113, Third metal layer; 114, Fourth metal layer; 12, Second connecting part; 121, Bottom wall; 122, Side wall; 1221, First wall; 1222, Second wall; 1223, Third wall; 1224, Fourth wall; 123, First groove; 124, First metal layer; 1241, First bottom wall; 1242, First side wall; 125, Second metal layer; 1251, Second bottom wall; 1252, First... 126. Second body; 127. Second protrusion; 13. Transition section; 131. First section; 132. Second section; 133. Third section; 134. Fusible part; 20. Cover plate; 21. Electrode hole; 30. First insulating component; 31. First insulating part; 32. Second insulating part; 33. Third insulating part; 40. Second insulating component; 200. Housing; 300. Cell assembly; 301. Cell; 302. Electrode tab; b1. First surface; b2. Second surface; b3. Third surface; b4. Fourth surface; b5. First end face; b6. Second end face; b7. Third end face; b8. Joint interface. Detailed Implementation

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] See Figure 1 This application provides an electrical device, a battery, and a battery cell 1000. The electrical device includes the battery or the battery cell 1000 and is capable of being powered by the battery or the 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] This application also provides a top cover assembly 100. See also... Figure 1 and Figure 2 In one embodiment of the present invention, the battery cell 1000 includes a top cover assembly 100, a housing 200, and a cell assembly 300.

[0099] The housing 200 has a hollow structure with an internal cavity for accommodating the battery cell assembly 300, electrolyte, and other components. The cavity has an opening through which the battery cell assembly 300 can be inserted into the housing 200. Since the battery cell 1000 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 enclosed 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, the top cover assembly 100 is approximately rectangular.

[0100] The cell assembly 300 is the core component of the battery cell 1000. To fit the shape of the casing 200, the cell assembly 300 in this embodiment is approximately cuboid in shape. The cell assembly 300 generally includes at least two sets of [missing information - likely related to thickness direction] along the second thickness direction of the casing 200. Figure 4 The battery cells 301 are arranged in parallel in the X direction, and each group of battery cells 301 extends a tab 302 toward the top cover assembly 100.

[0101] It should be noted that each group of battery cells 301 can be a single battery cell 301 or multiple battery cells 301, and this is not limited here. When each group of battery cells 301 includes a single battery cell 301, that battery cell 301 extends a positive electrode tab and a negative electrode tab towards the top cover assembly 100. When each group of battery cells 301 includes multiple battery cells 301, each battery cell 301 extends a positive electrode tab and a negative electrode tab towards the top cover assembly 100. The positive electrode tabs on the battery cells 301 in the same group are brought together to form a single positive electrode tab, and the negative electrode tabs on the battery cells 301 in the same group are brought together to form a single negative electrode tab.

[0102] In one embodiment, the battery cell assembly 300 includes two sets of battery cells 301, each set of battery cells 301 including one battery cell 301. That is, the battery cell assembly 300 includes a total of two battery cells 301. The two battery cells 301 are arranged side by side along the second thickness direction. One battery cell 301 has a positive electrode tab facing the top cover assembly 100 as a positive electrode tab and a negative electrode tab as a negative electrode tab. The other battery cell 301 has a positive electrode tab facing the top cover assembly 100 as another positive electrode tab and a negative electrode tab as another negative electrode tab.

[0103] See Figure 5 and Figure 6 In one embodiment of this application, the top cover assembly 100 includes a pole post 10 and a cover plate 20.

[0104] The cover plate 20 can be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. See also Figure 5 and Figure 7 The cover plate 20 has a third surface b3, a fourth surface b4, and a pole hole 21, wherein the third surface b3 and the fourth surface b4 are along the third thickness direction of the cover plate 20. Figure 7 The electrode holes 21 are arranged opposite to each other in the Z-direction, and penetrate the cover plate 20 along the third thickness direction, that is, the electrode holes 21 connect the third surface b3 and the fourth surface b4. The cover plate 20 is placed on the opening of the housing 200 to seal the opening of the housing 200. The third surface b3 of the cover plate 20 faces away from the cell assembly 300 in the housing cavity of the housing 200, and the fourth surface b4 of the cover plate 20 faces the cell assembly 300 in the housing cavity of the housing 200.

[0105] The terminal 10 is mounted on the cover plate 20. The terminal 10 on the cover plate 20 can be either a positive terminal 10a or a negative terminal 10b. The positive terminal 10a is used to connect with the positive tab of each group of battery cells 301, thereby leading the positive tab of each group of battery cells 301 out to the outside of the housing 200. The negative terminal 10b is used to connect with the negative tab of each group of battery cells 301, thereby leading the negative tab of each group of battery cells 301 out to the outside of the housing 200. The positive terminal 10a serves as the positive terminal of the battery cell 1000, and the negative terminal 10b serves as the negative terminal of the battery cell 1000. The positive and negative terminals of each battery cell 1000 are connected using electrical connectors to achieve series, parallel, or mixed series and parallel connections of the battery cells 1000.

[0106] It should be noted that, since the positive terminal 10a and the negative terminal 10b have similar structures, this article will use one of the terminals 10 as an example for ease of understanding. That is to say, the "terminal 10" in this article can be either the positive terminal 10a or the negative terminal 10b (unless otherwise specified), and the "tab 302" in this article can be either the positive tab or the negative tab (unless otherwise specified), as long as each tab 302 connected to the positive terminal 10a is a positive tab and each tab 302 connected to the negative terminal 10b is a negative tab.

[0107] Specifically, see Figure 8 and Figure 9 The pole post 10 includes a first connecting portion 11 and a second connecting portion 12, wherein at least two second connecting portions 12 are provided, and at least two second connecting portions 12 are arranged along a first direction ( Figure 9 The cells are spaced apart in the X-direction, and each second connecting part 12 is connected to the first connecting part 11. In this case, the first direction aligns with the width direction of the cover plate 20, the second thickness direction, and the arrangement direction of the multiple battery cells 301. The first connecting part 11 is used to connect electrical connectors, and the second connecting parts 12 are used to connect tabs 302. When multiple battery cells 1000 are connected by electrical connectors, the electrical connectors can be connected to the first connecting part 11 by welding or other methods. These electrical connectors can be busbars or terminals of other battery cells 1000.

[0108] Further reading Figure 7 The first connecting part 11 is installed on the side of the cover plate 20 with the third surface b3, and the second connecting part 12 is assembled in the pole hole 21 and connected to the corresponding pole tab 302 respectively. That is, at least two second connecting parts 12 are connected to the pole tabs 302 of multiple sets of cells 301 one by one.

[0109] In the aforementioned top cover assembly 100, the pole post 10 is directly connected to the tabs 302 of multiple battery cells 301 via at least two second connecting parts 12. On the one hand, this avoids the use of adapter plates, thereby reducing the number of parts in the top cover assembly 100. On the other hand, by arranging at least two second connecting parts 12 along the arrangement direction of multiple sets of battery cells 301, the at least two second connecting parts 12 pass through the pole post holes 21 of the cover plate 20 and are connected to the tabs 302 of multiple sets of battery cells 301 respectively. This avoids the need to increase the radial dimension of the pole post 10 and the need to extend the tabs 302, thereby avoiding increasing the material cost of the pole post 10 and increasing the risk of adverse phenomena such as the tabs 302 being inserted too far into the battery cells 301 and the tabs 302 tearing.

[0110] The number of second connection parts 12 can be two, but is not limited to two; it can also be three or more. The number of second connection parts 12 is related to the number of groups of battery cells 301; the number of second connection parts 12 corresponds to the number of groups of battery cells 301. For ease of understanding, the following explanation will use the example of a battery cell assembly 300 including two groups of battery cells 301 and a terminal post 10 including two second connection parts 12.

[0111] It should be noted that the number of first connecting parts 11 is not limited to one, but can be two or more. The number of first connecting parts 11 is related to the number of second connecting parts 12. A first connecting part 11 is provided between two adjacent second connecting parts 12. The number of first connecting parts 11 is one less than the number of second connecting parts 12.

[0112] In one embodiment, a pole hole 21 may be provided on the cover plate 20. The pole hole 21 is a hole with a large area to allow at least two second connecting parts 12 to be accommodated in the pole hole 21.

[0113] It is understood that in other embodiments, a pole post hole 21 is provided on the cover plate 20 corresponding to each second connecting part 12, so that each second connecting part 12 is connected to the corresponding pole lug 302 through the corresponding pole post hole 21. In this way, compared with a through hole on the cover plate 20 to which the pole post 10 is installed as a whole, this embodiment only needs to open a pole post hole 21 that matches the outer contour size of the second connecting part 12, which greatly reduces the opening area on the cover plate 20, minimizes the adverse effects on the strength of the cover plate 20, ensures that the strength of the cover plate 20 can meet the requirements, and increases the contact area between the first connecting part 11 and the cover plate 20 to ensure the stability of the assembly structure.

[0114] In some embodiments, along the third thickness direction, the first connecting portion 11 has a first projection, the second connecting portion 12 has a second projection, and the pole hole 21 has a third projection. The third projection covers the second projection, and at least part of the first projection and the third projection do not coincide.

[0115] It should be noted that when only one pole hole 21 is provided on the cover plate 20, the third projection formed by the pole hole 21 covers the entire second projection; when one pole hole 21 is formed on the cover plate 20 corresponding to each second connecting part 12, the third projection formed by the pole hole 21 covers its corresponding second projection. When the pole 10 includes a first connecting part 11, at least a portion of the first projection of the first connecting part 11 does not coincide with the third projection; when the pole 10 includes multiple first connecting parts 11, at least a portion of the first projection of each first connecting part 11 does not coincide with the third projection.

[0116] The fact that at least part of the first projection and the third projection do not coincide can be understood as the first connecting part 11 and the pole hole 21 being at least partially offset. This avoids the pole hole 21 being too large and affecting the strength of the cover plate 20. Moreover, at this time, the first projection and the cover plate 20 partially coincide, meaning that the cover plate 20 can support the first connecting part 11, ensuring the stability of the pole assembly structure and preventing the first connecting part 11 from collapsing into the receiving cavity. At the same time, the third projection covering the second projection can be understood as the second connecting part 12 being completely located within the pole hole 21. When the second connecting part 12 is completely located within the pole hole 21, compared to the prior art, the second connecting part 12 is equivalent to eliminating the flange structure used for pressing the sealing ring, making the size of the second connecting part 12 in the width direction of the cover plate 20 smaller. Even when the width of the cover plate 20 is small, there is enough space between the second connecting parts 12 to accommodate the first connecting part 11. The first connecting part 11 does not need to be along the length direction of the cover plate 20. Figure 2 Extending in the Y direction avoids increasing the material used for the terminal post 10, thereby reducing the manufacturing cost of the terminal post 10. It also ensures the distance between the edge of the cover plate 20 and the edge of the terminal post 10, preventing interference with the terminal post 10 during welding of the cover plate 20 and the housing 200. Furthermore, with a fixed width of the cover plate 20, eliminating the flange structure of the second connecting part 12 used for pressing the sealing ring allows for enlarging the portion of the second connecting part 12 that passes through the terminal post hole 21, thereby increasing the welding area with the tab 302. Alternatively, the width of the first connecting part 11 can be increased, improving the current-carrying area of ​​the terminal post 10 (the current-carrying area of ​​the terminal post 10 refers to the effective conductive area of ​​the terminal post 10 when current flows through it), thus improving the battery's charging and discharging efficiency and heat dissipation performance.

[0117] In some embodiments, along the first direction, the overlap dimension of the first projection and the third projection is L, where 0mm ≤ L ≤ 10mm. This ensures that the edges of the first projection and the third projection are exactly connected, or that they have an overlapping portion. This avoids the electrode hole 21 and the first connecting portion 11 being too far apart in the first direction, thus avoiding them occupying a large dimension in the width direction of the cover plate 20. This ensures the strength of the cover plate 20 while allowing for the mounting of the electrode 10 on a cover plate 20 with a smaller width. Furthermore, when the width of the cover plate 20 is limited, it also increases the current-carrying area of ​​the first connecting portion 11, ensuring the current-carrying capacity of the battery cell.

[0118] It should be noted that the dimensions mentioned in this article can be the maximum size, the minimum size, or the average size; no limitation is made here.

[0119] Preferably, along the first direction, the overlap dimension between the first projection and the third projection is L, where 0mm < L ≤ 6mm. This further reduces the range of overlap dimensions between the first projection and the third projection, ensuring sufficient strength of the cover plate 20.

[0120] It should be noted that, along the first direction, the overlap size between the first projection and the third projection can be 1mm, 2mm, 3mm, 4mm, 4mm, 5mm or 6mm, etc., and is not limited here.

[0121] In some embodiments, see further reference. Figure 6 The top cover assembly 100 also includes a first insulating member 30, which is insulatingly disposed between the pole post 10 and the cover plate 20 to prevent electrical conduction between the pole post 10 and the cover plate 20.

[0122] The top cover assembly 100 also includes a second insulating member 40 disposed on the fourth surface b4 of the cover plate 30 for forming insulation between the cover plate 30 and the cell assembly 300.

[0123] Furthermore, nanopores are provided on the pole post 10 and the cover plate 20, and at least a portion of the first insulating element 30 is embedded in the nanopores. Since the first insulating element 30 is embedded in the nanopores of the cover plate 20 and the pole post 10, the bonding force between the first insulating element 30 and the pole post 10, as well as between the first insulating element 30 and the cover plate 20, is improved. The pole post 10 not only achieves insulation and sealing with the cover plate 20 through the first insulating element 30, but also achieves a firm connection with the cover plate 20 through the first insulating element 30.

[0124] Optionally, the first insulating component 30 is integrally formed. After assembling the electrode post 10 onto the cover plate 20, the first insulating component 30 is integrally formed using nano-injection molding. Specifically, a corrosive liquid is first used to etch nanopores onto the cover plate 20 and the electrode post 10. The electrode post 10 and the cover plate 20 are then assembled, and molten material is injected between the electrode post 10 and the cover plate 20 using a mold. The molten material is embedded in the nanopores. Compared to ordinary injection molding, nano-injection molding can enhance the bonding strength and sealing effect. Therefore, using nano-injection molding can eliminate the need for a sealing ring located between the second connecting part 12 and the cover plate 20.

[0125] Continue reading Figure 7 The first insulating member 30 includes a first insulating portion 31, which is insulatingly disposed between the first connecting portion 11 and the third surface b3 of the cover plate 20 to prevent electrical conduction between the first connecting portion 11 and the cover plate 20. Simultaneously, the first insulating portion 31 securely connects the first connecting portion 11 and the cover plate 20. The first insulating member 30 also includes a second insulating portion 32 connected to the first insulating portion 31. The second insulating portion 32 is disposed within the pole hole 21 and sleeved outside the second connecting portion 12 to prevent electrical conduction between the second connecting portion 12 and the cover plate 20. Simultaneously, the second insulating portion 32 securely connects the second connecting portion 12 and the cover plate 20.

[0126] Optionally, please continue reading Figure 7 The second insulating part 32 extends out of the pole hole 21 at both ends along the third thickness direction and covers at least part of the third surface b3 and the fourth surface b4, so that the first insulating member 30 can be engaged with the cover plate 20, preventing the first insulating member 30 from falling off the cover plate 20, thereby further improving the connection strength between the pole 10 and the cover plate 20.

[0127] In some embodiments, see Figure 10 and Figure 11 Each second connecting portion 12 includes a sidewall 122 and a bottom wall 121 that are interconnected. The sidewall 122 is disposed around the periphery of the bottom wall 121, and the sidewall 122 faces the bottom wall 121 in a first thickness direction. Figure 11 Extending along one side (in the Z direction), the sidewall 122 and the bottom wall 121 together form a first groove 123. The surface of the bottom wall 121 away from the sidewall 122 is used for electrical connection with the tab 302, and the first connecting part 11 is connected to the first end face b5 of the sidewall 122 away from the bottom wall 121. The first direction intersects with the first thickness direction, and the first direction is consistent with the width direction and the second thickness direction of the cover plate 20. The first thickness direction is consistent with the third thickness direction of the cover plate 20.

[0128] In the above configuration, each second connecting portion 12 includes a bottom wall 121 and a side wall 122, with the side wall 122 extending towards the bottom wall 121 in the first thickness direction. The first connecting portion 11 is connected to the first end face b5 of the side wall 122 away from the bottom wall 121. Therefore, the second connecting portion 12 in this application only includes the bottom wall 121 and the side wall 122. Compared to the structure in the prior art, the second connecting portion 12 in this application completely omits the flange structure. The second connecting portion 12, which omits the flange structure, occupies a smaller dimension in the width direction of the cover plate 20. Even when the width of the cover plate 20 is small, there is sufficient space between the second connecting portions 12 to accommodate the first connecting portion 11. The first connecting portion 11 does not need to extend along the length direction of the cover plate 20, avoiding increasing the material used for the pole post 10, thereby reducing the manufacturing cost of the pole post 10. Furthermore, with the width of the cover plate 20 fixed, the flange structure of the second connecting part 12 used for pressing the sealing ring can be completely eliminated. The part of the second connecting part 12 that passes through the electrode hole 21 can be enlarged, thereby increasing the welding area for welding with the electrode tab 302. Alternatively, the width of the first connecting part 11 can be enlarged to increase the current flow area of ​​the electrode 10, thereby improving the charging and discharging efficiency and heat dissipation performance of the battery.

[0129] It should also be noted that since the sidewall 122 and the bottom wall 121 together form a first groove 123, the second connecting portion 12 is essentially a hollow structure, which saves material and reduces the weight of the pole post 10. In some embodiments, the third insulating member 30 further includes a third insulating portion 33, which covers the inner surface of the first groove 123. Therefore, compared to the solid structure of the second connecting portion 12, the first groove 123 increases the contact area with the third insulating portion 33, thereby improving the connection strength between the pole post 10 and the cover plate 20.

[0130] In some embodiments, see Figure 12 and Figure 13 The first connecting portion 11 has a first surface b1 and a second surface b2 disposed opposite to each other along a first thickness direction. The second surface b2 is disposed near the bottom wall 121 relative to the first surface b1, that is, along the first thickness direction, the second surface b2 is disposed near the cover plate 20 relative to the first surface b1. (Continue reading...) Figure 13 Along the first thickness direction, the first end face b5 is located on the side of the second surface b2 away from the first surface b1. If the first surface b1 is defined as the upper surface of the first connecting part 11 and the second surface b2 is defined as the lower surface of the first connecting part 11, then the first end face b5 is located below the second surface b2. This arrangement can reduce the space occupied by the sidewall 122 in the first thickness direction and improve the energy density of the battery (battery pack or battery module).

[0131] It is understood that in some other embodiments, the first end face b5 may also be positioned above the second surface b2, which is not limited here.

[0132] Optionally, see Figure 13 The distance between the first end face b5 and the second surface b2 is c, where -1mm ≤ c ≤ 2mm. A positive value indicates the second surface b2 is above the first end face b5, a negative value indicates the second surface b2 is below the first end face b5, and c = 0 indicates the first end face b5 and the second surface b2 are flush. When c > 2mm, two situations arise: one is that the first connecting part 11 is significantly higher than the cover plate 20, reducing the space utilization of the battery (battery pack or battery module); the other is that the first end face b5 is too low, affecting the seal between the second connecting part 12 and the hole wall of the terminal post 21. When c < -1mm, the depth of the first groove 123 is too deep, making stamping more difficult. Setting -1mm ≤ c ≤ 2mm can eliminate the adverse effects of c being too large or too small.

[0133] Preferably, 0mm≤c≤1mm, in order to further eliminate the adverse effects caused by c being too large or too small.

[0134] It should be noted that c can be 0mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm or 1mm, etc., and is not limited here.

[0135] In some embodiments, see further reference. Figure 7 First end face b5 ( Figure 7The dashed line indicates that the first end face (b5) is flush with the third surface (b3). Alternatively, in the first thickness direction, the first end face (b5) is located on the side of the third surface (b3) closer to the first connecting portion 11, and the distance between the first end face (b5) and the third surface (b3) is less than or equal to 1.5 mm. Alternatively, in the first thickness direction, the first end face (b5) is located on the side of the third surface (b3) away from the first connecting portion 11, and the distance between the first end face (b5) and the third surface (b3) is less than or equal to 1.5 mm. It can be understood that the third surface (b3) is the upper surface of the cover plate 20, the fourth surface (b4) is the lower surface of the cover plate 20, the first end face (b5) can be flush with the upper surface of the cover plate 20, or the first end face (b5) can be located above the upper surface of the cover plate 20, but the distance between the first end face (b5) and the third surface (b3) does not exceed 1.5 mm, or the first end face (b5) can be located below the upper surface of the cover plate 20, but the distance between the first end face (b5) and the third surface (b3) does not exceed 1.5 mm. If the first end face b5 is located on the side of the third surface b3 closer to the first connecting part 11 (located above the upper surface of the cover plate 20), the distance between the first end face b5 and the third surface b3 is negative. If the first end face b5 is located on the side of the third surface b3 away from the first connecting part 11 (located below the upper surface of the cover plate 20), the distance between the first end face b5 and the third surface b3 is positive. Then the distance between the first end face b5 and the third surface b3 is M, -1.5mm≤M≤1.5mm.

[0136] Because the first end face b5 is too much lower than the third surface b3 (the upper surface of the cover plate 20), the insulation and sealing path between the second connecting part 12 and the cover plate 20 will be too short, which may cause problems such as short circuit, air leakage or liquid leakage. If the first end face b5 is too much higher than the third surface b3 (the upper surface of the cover plate 20), it will occupy too much external space (the internal space of the battery module or battery pack), and the second connecting part 12 is easily damaged during production and transportation if it extends too far beyond the third surface b3.

[0137] The above configuration limits the distance between the first end face b5 and the third surface b3 to a suitable range, ensuring the insulation and sealing effect between the second connecting part 12 and the cover plate 20, while reducing the second connecting part 12 from occupying too much external space, and preventing the second connecting part 12 from being damaged when it extends too far outward.

[0138] Preferably, -0.5mm≤M≤0.5mm ensures that the distance between the first end face b5 and the third surface b3 is within the optimal range. This ensures the insulation and sealing effect between the second connecting part 12 and the cover plate 20, while reducing the second connecting part 12 from occupying too much external space and preventing damage when the second connecting part 12 extends too far outward.

[0139] It should be noted that M can be -0.5mm, 0mm, or 0.5mm, etc., and is not limited here.

[0140] In other embodiments, along the first thickness direction, the surface where the bottom wall 121 is connected to the side wall 122 ( Figure 7 and Figure 8 The location indicated by the reference numeral A is located between the third surface b3 and the fourth surface b4, that is, the bottom surface of the first groove 123 is located between the third surface b3 and the fourth surface b4. If the bottom surface of the first groove 123 is below the fourth surface b4, it will occupy the internal space of the battery cell 1000, resulting in wasted space. If the bottom surface of the first groove 123 is above the third surface b3, it will be difficult for the second connecting part 12 to extend downward beyond the fourth surface b4. In this case, the tab 302 needs to extend into the terminal hole 21 to connect with the second connecting part 12, which not only makes welding difficult, but also makes the tab 302 easy to bend or even break.

[0141] The above configuration, by limiting the bottom surface of the first groove 123 to be located between the third surface b3 and the fourth surface b4, not only reduces the waste of space, but also facilitates the welding of the tab 302 and the pole post 10, and the tab 302 is less prone to bending and breakage.

[0142] In some embodiments, see further reference. Figure 9 The dimension of the bottom wall 121 along the first thickness direction is less than or equal to the dimension of the first connecting portion 11 along the first thickness direction. To improve the energy density of the battery cell 301, the foil thickness is smaller, meaning the thickness of the tab 302 is less than the thickness of the electrical connector. Therefore, the required penetration depth for the tab 302 welding is also smaller. Since the end of the bottom wall 121 away from the side wall 122 is connected to the tab 302, the dimension of the bottom wall 121 along the first thickness direction can be made smaller than the dimension of the first connecting portion 11 along the first thickness direction. This facilitates the stamping and forming of the electrode post 10, while reducing the material used in the bottom wall 121 and lowering the weight of the electrode post 10. It should be noted that because the tab 302 is close to the battery cell 301, the heat from the tab 302 can be transferred to the battery cell 301. The battery cell 301 has a larger volume and can absorb more heat. Therefore, even if the thickness of the bottom wall 121 is small, the heat generated during welding will not adversely affect the bottom wall 121.

[0143] Continue reading Figure 11The included angle between the side wall 122 and the bottom wall 121 is α, where 90°≤α≤95°. If α is small, the size of the end of the second connecting part 12 near the bottom wall 121 is larger than the size of the end of the second connecting part 12 away from the bottom wall 121, making it difficult to assemble from the side of the third surface b3 of the cover plate 20 into the pole hole 21, resulting in difficulty in assembling the pole 10. If α is too large, it will cause the pole 10 to be too large, and the size of the end of the second connecting part 12 away from the bottom wall 121 will be much larger than the size of the end of the second connecting part 12 near the bottom wall 121, resulting in the second connecting part 12 occupying too much space in the width direction of the cover plate 20 and wasting space, or causing the bottom wall 121 to be too small in the width direction of the cover plate 20, affecting the welding of the bottom wall 121 and the pole lug 302. Therefore, by setting 90°≤α≤95°, it is possible to ensure the welding of the bottom wall 121 and the tab 302 while facilitating the assembly of the pole post 10, and also to avoid the pole post 10 being too large and wasting space.

[0144] Specifically, α can be 90°, 91°, 92°, 93°, 94°, or 95°, etc., without limitation.

[0145] In some embodiments, the wall thickness of the bottom wall 121 is greater than or equal to the wall thickness of the side wall 122. Since the bottom wall 121 needs to be welded to the tab 302, molten pools are formed on both the bottom wall 121 and the tab 302. Therefore, the wall thickness of the bottom wall 121 has certain requirements; otherwise, it will melt during welding. The side wall 122, however, does not need to be welded and only provides flow passage. Therefore, the wall thickness of the bottom wall 121 can be set to be greater than or equal to the wall thickness of the side wall 122. This satisfies the welding requirements between the bottom wall 121 and the tab 302 while facilitating the second connecting portion 12 to be formed by stretching and stamping a flat material. It should be noted that the wall thickness of the bottom wall 121 is its dimension in the first thickness direction, and the wall thickness of the side wall 122 is its dimension in its thickness direction.

[0146] In some embodiments, see further reference. Figure 11 The side wall 122 has a first wall 1221 and a second wall 1222 spaced apart along a first direction, and the first wall 1221 is connected to the first connecting portion 11. (Continue reading...) Figure 10 Since the sidewall 122 is arranged around the periphery of the bottom wall 121, the sidewall 122 also includes a second direction ( Figure 10A third wall 1223 and a fourth wall 1224 are spaced apart in the Y direction. The two ends of the third wall 1223 and the fourth wall 1224 are connected to the first wall 1221 and the second wall 1222, respectively. Generally, the first wall 1221 and the second wall 1222 are straight walls, while the third wall 1223 and the fourth wall 1224 are arc-shaped walls, specifically circular arc-shaped walls. Thus, the first wall 1221, the third wall 1223, the second wall 1222 and the fourth wall 1224 are connected end to end to form a complete circle around the perimeter of the bottom wall 121, and together with the bottom wall 121, they form the first groove 123.

[0147] It should be noted that the first direction, the first thickness direction, and the second direction intersect each other. Specifically, the first direction, the first thickness direction, and the second direction are perpendicular to each other. The second direction coincides with the width direction of the housing 200 and the length direction of the cover plate 20.

[0148] Further reading Figure 13 The dimension d3 of the first wall 1221 along the first direction is greater than or equal to the dimension d4 of the second wall 1222 along the first direction. Since the first wall 1221 not only seals with the cover plate 20 through the second insulating part 32 but also serves as a current-carrying element, while the current-carrying function of the second wall 1222 is smaller. By setting the dimension of the first wall 1221 along the first direction to be greater than or equal to the dimension of the second wall 1222 along the first direction, the current-carrying area of ​​the electrode post 10 can be increased, allowing for a larger fast-charging rate, and the space occupied by the electrode post 10 along the first direction can be reduced.

[0149] In some embodiments, see further reference. Figure 12 and Figure 13 The pole post 10 includes a transition portion 13, which corresponds one-to-one with the second connecting portion 12. The first connecting portion 11 is connected to each first end face b5 through the corresponding transition portion 13. The third insulating portion 33 can also cover the transition portion 13 to improve the connection strength between the pole post 10 and the cover plate 20.

[0150] The transition portion 13 serves as a transitional connection between the first connecting portion 11 and the second connecting portion 12. The transition portion 13 is stretchable and forms a height difference between the first connecting portion 11 and the second connecting portion 12 along a first thickness direction to facilitate installation. During the operation of the battery cell 1000, current is transmitted between the first connecting portion 11 and the second connecting portion 12 through the transition portion 13.

[0151] In some specific embodiments, the transition section 13 ( Figure 13 The portion between the two dashed lines illustrates that one end of the transition portion 13) is connected to the second surface b2, and the other end is connected to the first end face b5, so that the first connecting portion 11 and the second connecting portion 12 are spaced apart in the first thickness direction, making installation convenient.

[0152] Specifically, the first wall 1221 is close to the surface of the first groove 123. Figure 13 The position indicated by the reference numeral D) and the side surface of the first connecting portion 11 along the first direction ( Figure 13 The position indicated by the Chinese numeral E is flush with the first wall 1221. It should be noted that the surface of the first wall 1221 near the first groove 123 is the part of the side surface of the first groove 123 that is located on the first wall 1221.

[0153] With the above configuration, since the surface of the first wall 1221 near the first groove 123 is flush with the side surface of the first connecting part 11 along the first direction, the size of the first connecting part 11 along the first direction is made as large as possible to ensure the current flow effect of the pole post 10.

[0154] Furthermore, the surface of the first wall 1221 is away from the surface of the first groove 123. Figure 13 The position indicated by the numeral F) transitions to the second surface b2 by an arc. Since the first connecting part 11 and the second connecting part 12 are connected by the transition part 13, the surface of the first wall 1221 away from the first groove 123 transitions to the surface of the transition part 13 by an arc.

[0155] In other embodiments, see Figure 14 Transition section 13 ( Figure 14 The portion between the dashed lines illustrates the transition section 13), which includes a first segment 131 and a second segment 132 connected to each other. The end of the first segment 131 away from the second segment 132 is connected to the side of the first connecting portion 11 along a first direction, and the end of the second segment 132 away from the first segment 131 is connected to the first end face b5. The connection between the first segment 131 and the first connecting portion 11, and the connection between the second segment 132 and the second connecting portion 12, facilitates the stretching and forming of the pole post 10.

[0156] Optionally, the transition section 13 further includes a third segment 133, which connects the first segment 131 and the second segment 132. The third segment 133 is arc-shaped. The third segment 133 facilitates the connection between the first segment 131 and the second segment 132.

[0157] It is understood that in other embodiments, the transition section 13 may omit the third segment 133 or include other transition segments, which is not limited here.

[0158] In one embodiment, the first connecting portion 11 and the electrode post 10 have a first dimension and a second dimension respectively along a first direction, and the ratio of the first dimension and the second dimension is in the range of 'a', where 20% ≤ a ≤ 60%. If 'a' is too small, it means that the solder joint width between the first connecting portion 11 and the electrical connector is small, and there will be an overcurrent bottleneck at the welding position of the electrical connector; conversely, if 'a' is too large, it will result in a small solder joint width between the second connecting portion 12 and the electrode tab 302, and there will be an overcurrent bottleneck at the welding position of the electrode tab 302. By setting 20% ​​≤ a ≤ 60%, the solder joint widths between the first connecting portion 11 and the electrical connector and the second connecting portion 12 and the electrode tab 302 are both kept within a suitable range, thereby avoiding overcurrent bottlenecks at the welding positions of the electrical connector and the electrode tab 302.

[0159] Preferably, 30% ≤ a ≤ 50%. This ensures that the welding width between the first connecting part 11 and the electrical connector, as well as the welding width between the second connecting part 12 and the tab 302, are kept within a more suitable range, thereby avoiding overcurrent bottlenecks at the welding positions of the electrical connector and the tab 302.

[0160] It should be noted that 'a' can be 30%, 35%, 40%, 45%, or 50%, etc., and is not limited here.

[0161] In some embodiments, see further reference. Figure 10 The first connecting portion 11 includes a first body 111 and a first protrusion 112. The first body 111 is connected to the first end face b5, and the first protrusion 112 protrudes along the first thickness direction at one end of the first body 111 away from the side wall 122. The projection of the first protrusion 112 along the first thickness direction falls inside the first body 111.

[0162] Since the projection of the first protrusion 112 along the first thickness direction falls within the first body 111, the dimension of the first body 111 along the first direction serves as the dimension of the first connecting portion 11 along the first direction. The electrical connector is welded to the first protrusion 112, and the third insulating portion 33 of the first insulating member 30 is located on the side of the first body 111 where the first protrusion 112 is protruding, near the first end face b5, or the third insulating portion 33 is flush with the surface of the first body 111 where the first protrusion 112 is protruding. Thus, by providing the first protrusion 112, during injection molding, it is possible to prevent the injection material from flowing to the surface of the first protrusion 112 away from the first body 111 (the surface used for welding with the electrical connector), thus preventing the third insulating portion 33 from covering the first protrusion 112, which facilitates the welding of the first protrusion 112 to the electrical connector.

[0163] Continue reading Figure 9The bottom wall 121 includes a second body 126 and a second protrusion 127. The side wall 122 is connected to the second body 126. The second protrusion 127 protrudes along a first thickness direction from one end of the second body 126 away from the side wall 122. The projection of the second protrusion 127 along the first thickness direction falls within the second body 126. The second protrusion 127 is welded to the tab 302. The second insulating portion 32 of the first insulating member 30 is located on the side of the second body 126 where the second protrusion 127 is located, near the first end face b5, or the second insulating portion 32 is flush with the surface of the second body 126 where the second protrusion 127 is located. Thus, by providing the second protrusion 127, during injection molding, it is possible to prevent the injection material from flowing to the surface of the second protrusion 127 away from the second body 126 (the surface used for welding with the tab 302), which would cause the second insulating portion 32 to cover the second protrusion 127, thus facilitating the welding of the second protrusion 127 to the tab 302.

[0164] In this embodiment, please continue to refer to Figure 10 A fuse portion 134 is formed on the transition portion 13. The current-passing area of ​​the fuse portion 134 is smaller than that of the first connecting portion 11 and smaller than that of the second connecting portion 12. The smaller the current-passing area, the greater the resistance and the greater the heat generated when current flows through it. When a short circuit occurs in the battery cell 1000, the current increases, the heat generation increases, and the fuse portion 134 between the first connecting portion 11 and the second connecting portion 12 is prone to melting and breaking the circuit, thereby ensuring safety. In other words, the fuse portion 134 can act as a fuse structure to provide protection.

[0165] In some embodiments, the dimension of the transition portion 13 along the second direction is smaller than the dimensions of the first connecting portion 11 and the second connecting portion 12 along the second direction, so that the transition portion 13 forms a fusible portion 134. In other embodiments, the dimensions of the transition portion 13 and the first connecting portion 11 along the second direction are equal, or the dimension of the transition portion 13 along the second direction is slightly smaller than the dimension of the first connecting portion 11 along the second direction, and the transition portion 13 is provided with a second groove or through hole along its thickness direction. It should be noted that the dimension of the second connecting portion 12 along the second direction is generally larger than the dimension of the first connecting portion 11, thereby facilitating the processing and forming of the pole post 10.

[0166] Continue reading Figure 14The second connecting portion 12 includes a first metal layer 124 and a second metal layer 125, with the second metal layer 125 covering the outer surface of the first metal layer 124. The first metal layer 124 includes a first bottom wall 1241 and a first side wall 1242, and the second metal layer 125 includes a second bottom wall 1251 and a second side wall 1252. The first bottom wall 1241 and the second bottom wall 1251 are connected to form a bottom wall 121, and the first side wall 1242 and the second side wall 1252 are connected to form a side wall 122. The first connecting portion 11 is connected to the first metal layer 124 and / or the second metal layer 125. Since the bottom and sides of the first metal layer 124 are covered with the second metal layer 125, it is less likely for the first metal layer 124 to come into contact with the electrolyte, thus preventing the electrolyte from corroding the first metal layer 124.

[0167] In this structure, a portion of the second bottom wall 1251 forms the second protrusion 127, and the remaining portion of the second bottom wall 1251 together with the first bottom wall 1241 forms the second main body 126.

[0168] Specifically, the second connecting portion 12 includes a first metal layer 124 and a second metal layer 125, with the electrode 10 being a negative electrode 10b. Since the second metal layer 125 covers the outside of the first metal layer 124, the second metal layer 125 can be directly welded to the tab 302. Metals with similar melting points are easier to weld. Generally, the material of the second metal layer 125 is the same as that of the tab 302, and the first metal layer 124 can be made of a lower-cost material.

[0169] In some specific embodiments, the negative electrode tab is made of copper, and the electrode post 10 welded to the negative electrode tab is called the negative electrode post 10b. In this case, the second metal layer 125 of the negative electrode post 10b is made of copper, and the first metal layer 124 can be made of aluminum, which is less expensive. Specifically, the positive electrode tab can also be made of aluminum.

[0170] It should be understood that in some embodiments, the materials of the first metal layer 124 and the second metal layer 125 are not limited.

[0171] The first connecting portion 11 is connected to both the first metal layer 124 and the second metal layer 125 of the first wall 1221. (Continue reading...) Figure 11 The first connecting portion 11 includes a third metal layer 113, which is connected to the first metal layer 124 and the second metal layer 125. The first metal layer 124 and the third metal layer 113 are made of the same material. A portion of the third metal layer 113 forms the first main body 111, and the remaining portion forms the first protrusion 112.

[0172] In other embodiments, see further description. Figure 14The first connecting portion 11 includes a third metal layer 113 and a fourth metal layer 114. The third metal layer 113 is connected to the first metal layer 124, and the fourth metal layer 114 is connected to the second metal layer 125. The third metal layer 113 and the first metal layer 124 are made of the same material, and the second metal layer 125 and the fourth metal layer 114 are made of the same material. A portion of the third metal layer 113 forms a second protrusion 127, and the remaining portion of the third metal layer 113, together with the fourth metal layer 114, forms the first main body 111.

[0173] Further reading Figure 13 The first metal layer 124 and the second metal layer 125 have a bonding interface b8, which intersects with the first end face b5. The bonding interface b8 is located on the surface of the second connecting portion 12 away from the tab 302, further reducing the possibility of electrolyte contact with the first metal layer 124 and preventing corrosion of the first metal layer 124 by the electrolyte. Furthermore, this arrangement extends the bonding path between the second metal layer 125 and the second insulating portion 32, increases the bonding area, and improves the sealing effect between the second connecting portion 12 and the cover plate 20.

[0174] Continue reading Figure 13 The second metal layer 125 of the first wall 1221 has a second end face b6 away from the bottom wall 121, and the second metal layer 125 of the second wall 1222 has a third end face b7 away from the bottom wall 121. The second end face b6 and the third end face b7 are flush. At this time, the second end face b6 is part of the first end face b5, and the third end face b7 is flush with the first end face b5. The flushness of the second end face b6 and the third end face b7 improves the stability of the bonding interface b8; and the second metal layers 125 of the first wall 1221 and the second wall 1222 protrude from the bottom wall 121 at the same height, ensuring the consistency of the sealing effect between the first wall 1221 and the second wall 1222 and the cover plate 20.

[0175] In some embodiments, see further reference. Figure 14 The dimension of the second bottom wall 1251 along the first thickness direction is greater than or equal to the dimension of the second side wall 1252 along the first direction. As mentioned above, the wall thickness of the bottom wall 121 is greater than or equal to the wall thickness of the side wall 122. When the second connecting portion 12 is formed by flat plate stretching and stamping, the ratio of the wall thickness formed by stretching the first metal layer 124 and the second metal layer 125 remains essentially unchanged. To ensure that the thickness of the bottom wall 121 is greater than or equal to the thickness of the side wall 122, i.e., to ensure the welding strength of the bottom wall 121, the dimension of the second bottom wall 1251 along the first thickness direction is greater than or equal to the dimension of the second side wall 1252 along the first direction.

[0176] Specifically, the dimension of the second metal layer 125 of the first wall 1221 along the first direction is greater than or equal to the dimension of the second metal layer 125 of the second wall 1222 along the first direction. Since the second metal layer 125 of the first wall 1221 not only seals with the cover plate 20 through the second insulating part 32 but also serves a current-carrying function, while the second metal layer 125 of the second wall 1222 does not serve a current-carrying function. By setting the dimension of the second metal layer 125 of the first wall 1221 along the first direction to be greater than or equal to the dimension of the second metal layer 125 of the second wall 1222 along the first direction, the current-carrying area of ​​the electrode post 10 can be increased, allowing for a larger fast charging rate, and the space occupied by the electrode post 10 along the first direction can be reduced.

[0177] For some specific implementation methods, please refer to [link / reference]. Figure 7 The dimension of the second bottom wall 1251 along the first thickness direction is d1, where 0.5mm ≤ d1 ≤ 2mm. When d1 is less than 0.5mm, the thickness of the second bottom wall 1251 does not meet the laser welding penetration depth, and phenomena such as incomplete welding and bursting points may occur during the welding of the tab 302. When d1 is greater than 2mm, the material consumption is high. Therefore, by limiting d1 within the optimized range, the material consumption can be reduced while ensuring that the thickness of the second metal layer 125 meets the laser welding penetration depth.

[0178] In other specific embodiments, the dimension of the second sidewall 1252 along the first direction is d2, where 0.1mm ≤ d2 ≤ 1.6mm. d2 needs to be greater than the nanopore depth during nano-injection molding; if d2 is too large, material consumption increases. Therefore, by limiting d2 within an optimized range, material consumption is reduced while ensuring that the thickness of the second sidewall 1252 meets the nanopore depth requirements.

[0179] It should be noted that d1 can be 0.5mm, 1mm, 1.5mm or 2mm, etc., and d2 can be 0.1mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.4mm or 1.6mm, etc., without specific limitations.

[0180] 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.

[0181] 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, include: The first connecting part (11) is used for electrical connection with the electrical connector; At least two second connecting portions (12) are spaced apart along a first direction, and each second connecting portion (12) is connected to the first connecting portion (11); Each of the second connecting portions (12) includes a sidewall (122) and a bottom wall (121) connected to each other. The sidewall (122) is disposed around the periphery of the bottom wall (121) and extends toward the first thickness direction of the bottom wall (121). The sidewall (122) and the bottom wall (121) together form a first groove (123). The surface of the bottom wall (121) away from the sidewall (122) is used for electrical connection with the tab (302). The first connecting portion (11) is connected to the first end face (b5) of the sidewall (122) away from the bottom wall (121). The first direction intersects the first thickness direction.

2. The pole post according to claim 1, characterized in that, The dimension of the bottom wall (121) along the first thickness direction is less than or equal to the dimension of the first connecting part (11) along the first thickness direction.

3. The pole post according to claim 1, characterized in that, The first connecting portion (11) has a first surface (b1) and a second surface (b2) disposed opposite to each other along the first thickness direction, and the second surface (b2) is disposed close to the bottom wall (121) relative to the first surface (b1); The first end face (b5) is located on the side of the second surface (b2) away from the first surface (b1).

4. The pole post according to claim 1, characterized in that, The sidewall (122) has a first wall (1221) and a second wall (1222) spaced apart along the first direction, and the first wall (1221) is connected to the first connecting portion (11); The dimension of the first wall (1221) along the first direction is greater than or equal to the dimension of the second wall (1222) along the first direction.

5. The pole post according to claim 1, characterized in that, The pole includes a transition section (13), which corresponds one-to-one with the second connecting section (12). The first connecting section (11) is connected to each of the first end faces (b5) through the corresponding transition section (13).

6. The electrode post according to claim 5, characterized in that, The first connecting portion (11) has a first surface (b1) and a second surface (b2) disposed opposite to each other along the first thickness direction, and the second surface (b2) is disposed close to the bottom wall (121) relative to the first surface (b1); One end of the transition portion (13) is connected to the second surface (b2), and the other end is connected to the first end face (b5).

7. The pole post according to claim 6, characterized in that, The sidewall (122) has a first wall (1221) and a second wall (1222) spaced apart along the first direction, and the first wall (1221) is connected to the first connecting portion (11); The surface of the first wall (1221) near the first groove (123) is flush with the side surface of the first connecting part (11) along the first direction.

8. The electrode post according to claim 6, characterized in that, The sidewall (122) has a first wall (1221) and a second wall (1222) spaced apart along the first direction, and the first wall (1221) is connected to the first connecting portion (11); The surface of the first wall (1221) away from the first groove (123) transitions to the second surface (b2) in an arc.

9. The pole post according to claim 6, characterized in that, The first connecting part (11) and the pole post have a first size and a second size respectively along the first direction, and the ratio of the first size to the second size is in the range of a, 20% ≤ a ≤ 60%.

10. The pole post according to claim 5, characterized in that, The transition portion (13) includes a first segment (131) and a second segment (132) that are connected to each other. The end of the first segment (131) away from the second segment (132) is connected to the side surface of the first connecting portion (11) along the first direction. The end of the second segment (132) away from the first segment (131) is connected to the first end face (b5).

11. The pole post according to claim 10, characterized in that, The transition section also includes a third section (133), which connects the first section (131) and the second section (132), and the third section (133) is arc-shaped.

12. The pole post according to claim 5, characterized in that, The dimension of the transition portion (13) along the second direction is smaller than the dimensions of the first connecting portion (11) and the second connecting portion (12) along the second direction; or, The transition portion (13) is provided with a second groove or through hole along its thickness direction; The first direction, the second direction, and the first thickness direction intersect each other.

13. The pole post according to claim 1, characterized in that, The included angle between the sidewall (122) and the bottom wall (121) is α, where 90°≤α≤95°.

14. The pole post according to any one of claims 1-13, characterized in that, The first connecting part (11) includes a first body (111) and a first protrusion (112). The first body (111) is connected to the first end face (b5). The first protrusion (112) protrudes along the first thickness direction at one end of the first body (111) away from the side wall (122). The projection of the first protrusion (112) along the first thickness direction falls inside the first body (111). And / or, The bottom wall (121) includes a second body (126) and a second protrusion (127). The side wall (122) is connected to the second body (126). The second protrusion (127) protrudes along the first thickness direction at one end of the second body (126) away from the side wall (122). The projection of the second protrusion (127) along the first thickness direction falls inside the second body (126).

15. The pole post according to any one of claims 1-13, characterized in that, The second connecting portion (12) includes a first metal layer (124) and a second metal layer (125), wherein the second metal layer (125) covers the outer surface of the first metal layer (124); The first metal layer (124) includes a first bottom wall (1241) and a first side wall (1242), and the second metal layer (125) includes a second bottom wall (1251) and a second side wall (1252). The first bottom wall (1241) and the second bottom wall (1251) are connected to form the bottom wall (121), and the first side wall (1242) and the second side wall (1252) are connected to form the side wall (122). The first connecting portion (11) is connected to the first metal layer (124) and / or the second metal layer (125).

16. The pole post according to claim 15, characterized in that, The first metal layer (124) and the second metal layer (125) have a bonding interface (b8) that intersects with the first end face (b5).

17. The pole post according to claim 16, characterized in that, The sidewall (122) has a first wall (1221) and a second wall (1222) spaced apart along the first direction, and the first wall (1221) is connected to the first connecting portion (11); The second metal layer (125) of the first wall (1221) has a second end face (b6) away from the bottom wall (121), and the second metal layer (125) of the second wall (1222) has a third end face (b7) away from the bottom wall (121), and the second end face (b6) and the third end face (b7) are flush.

18. The pole post according to claim 16, characterized in that, The dimension of the second bottom wall (1251) along the first thickness direction is greater than or equal to the dimension of the second side wall (1252) along the first direction; And / or, The sidewall (122) has a first wall (1221) and a second wall (1222) spaced apart along the first direction, the first wall (1221) being connected to the first connecting portion (11); the dimension of the second metal layer (125) of the first wall (1221) along the first direction is greater than or equal to the dimension of the second metal layer (125) of the second wall (1222) along the first direction; And / or, The dimension of the second bottom wall (1251) along the first thickness direction is d1, 0.5mm≤d1≤2mm; And / or, The dimension of the second sidewall (1252) along the first direction is d2, 0.1mm≤d2≤1.6mm.

19. The pole post according to claim 15, characterized in that, The first connecting part (11) includes a third metal layer (113), which is connected to the first metal layer (124) and the second metal layer (125). The first metal layer (124) and the third metal layer (113) are made of the same material. or, The first connecting part (11) includes a third metal layer (113) and a fourth metal layer (114). The third metal layer (113) is connected to the first metal layer (124), and the fourth metal layer (114) is connected to the second metal layer (125). The third metal layer (113) and the first metal layer (124) are made of the same material, and the second metal layer (125) and the fourth metal layer (114) are made of the same material.

20. The pole post according to claim 15, characterized in that, The first metal layer (124) is an aluminum layer, and the second metal layer (125) is a copper layer.

21. A top cover assembly, characterized in that, include: The pole post as described in any one of claims 1-20; The cover plate (20) has a third surface (b3) and a fourth surface (b4) disposed opposite to each other along the first thickness direction, and the cover plate (20) is provided with a pole hole (21) communicating with the third surface (b3) and the fourth surface (b4); The first connecting part (11) is located on the side of the cover plate (20) having the third surface (b3), and the second connecting part (12) is fitted into the pole hole (21).

22. The top cover assembly according to claim 21, characterized in that, Along the first thickness direction, the first connecting part (11) has a first projection, the second connecting part (12) has a second projection, and the pole hole (21) has a third projection; The third projection covers the second projection, and at least a portion of the first projection does not overlap with the third projection.

23. The top cover assembly according to claim 22, characterized in that, Along the first direction, the overlap dimension between the first projection and the third projection is L, where 0mm≤L≤10mm.

24. The top cover assembly according to claim 22, characterized in that, The top cover assembly also includes a first insulating element (30), which is insulatingly disposed between the pole post and the cover plate (20).

25. The top cover assembly according to claim 24, characterized in that, The pole and the cover plate (20) are provided with nanopores, and at least a portion of the first insulating element (30) is embedded in the nanopores.

26. The top cover assembly according to claim 21, characterized in that, The first end face (b5) is flush with the third surface (b3); or, The first end face (b5) is located on the side of the third surface (b3) close to the first connecting part (11), and the distance between the first end face (b5) and the third surface (b3) is less than or equal to 1.5 mm; or, The first end face (b5) is located on the side of the third surface (b3) away from the first connecting part (11), and the distance between the first end face (b5) and the third surface (b3) is less than or equal to 1.5 mm.

27. The top cover assembly according to claim 21, characterized in that, Along the first thickness direction, the surface where the bottom wall (121) connects to the side wall (122) is located between the third surface (b3) and the fourth surface (b4).

28. A single battery cell, characterized in that, Includes a housing (200), a cell assembly (300), and a top cover assembly as described in any one of claims 21-27; The housing (200) has a receiving cavity with an opening, and a cover plate (20) is provided over the opening. The battery cell assembly (300) is disposed in the receiving cavity and has at least two tabs (302) on the side facing the cover plate (20). The bottom wall (121) of each second connection portion (12) is connected to the corresponding tab (302) on the surface away from the side wall (122).

29. A battery, characterized in that, Includes the battery cell as described in claim 28.

30. An electrical device, characterized in that, It includes the battery cell as described in claim 28, or the battery as described in claim 29.

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