Pole, cell cover plate and battery

Abstract

The application provides a pole, a battery cell cover plate and a battery. The pole comprises a flat plate body part, a connecting part and a column part, the plate body part has first and second end faces, and first and second accommodating grooves are formed; the connecting part has a flat area and a folded edge area, the flat area is embedded in the first accommodating groove, and the folded edge area is embedded in the second accommodating groove; and the column part is arranged on the first end face. The plate body part and the connecting part are made of different materials to form a copper-aluminum composite structure, thereby improving the electrical conductivity and reducing the cost. The battery cell cover plate comprises a cover plate main body, the pole, a riveting block, a first plastic part, a second plastic part and a sealing ring, and through reasonable structural cooperation, functions such as current transmission, packaging and electrical connection are realized. The battery comprises the battery cell cover plate and has better charging and discharging performance, safety and stability. The pole structure is optimized, the current transmission efficiency and structural stability are improved, and the battery space layout and cost-effectiveness are optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pole, a cell cover plate and a battery. BACKGROUND

[0002] In the field of battery technology, the cell cover plate is a key component of the battery, which undertakes multiple functions such as current transmission, encapsulation of internal structure and electrical connection. Its performance and quality directly affect the overall performance and service life of the battery. However, the existing cell cover plate still faces many technical challenges in design and actual application.

[0003] Current transmission efficiency is a major problem of the existing cell cover plate. During the charging and discharging process of the battery, the current needs to be transmitted through the pole and other components on the cover plate. However, due to the unreasonable material selection or structure design of some existing poles, the current transmission is hindered, the resistance increases, and the current transmission efficiency is reduced. This not only affects the charging and discharging speed of the battery, but also increases the heat generation inside the battery, accelerates the aging of the battery, and even may cause safety hazards.

[0004] Insufficient structural stability is also a problem that needs to be solved for the existing cell cover plate. The battery will be subjected to various forces during use, such as vibration, impact, etc. If the structural stability of the cell cover plate is insufficient, the pole and other components are prone to looseness, falling off, etc., which may cause electrical connection interruption and affect the normal operation of the battery. In addition, unstable structure may also cause internal short circuit of the battery, leading to safety accidents.

[0005] Low space utilization is also a problem of the existing cell cover plate. With the development of electronic devices towards miniaturization and thinness, the space requirement for batteries is also increasing. However, the design of some existing cell cover plates does not fully consider space optimization, resulting in large space occupation of the pole and other components, limiting the improvement of the overall energy of the battery, and not conducive to meet the market demand for high energy density batteries.

[0006] In summary, the existing cell cover plate has obvious deficiencies in current transmission efficiency, structural stability and space utilization, which seriously affects the performance, safety and reliability of the battery, and restricts the development and application of battery technology. Therefore, it is necessary to provide a new type of pole, cell cover plate and battery to improve the overall performance of the battery. SUMMARY

[0007] Therefore, it is necessary to provide a pole, a battery cell cover plate and a battery in view of the technical challenges in the design and actual application of the existing battery cell cover plate, such as low current transmission efficiency, insufficient structural stability, low space utilization, and the like, so as to significantly improve the charging and discharging performance, safety and stability of the battery, and optimize the space layout and cost-effectiveness of the battery.

[0008] The first aspect of the present application provides a pole, comprising:

[0009] a plate body portion in a flat structure, based on which a length direction, a width direction and a thickness direction are defined, the plate body portion having a first end face and a second end face opposite in the thickness direction, the second end face being provided with a first accommodating groove extending in the width direction, and the plate body portion being provided with a second accommodating groove extending in the thickness direction on both end faces in the width direction;

[0010] a connecting portion having a planar region and a folded edge region on both side walls in the width direction of the planar region, the planar region being complementarily embedded in the first accommodating groove, and the folded edge region being complementarily embedded in the second accommodating groove;

[0011] a column portion arranged on the first end face and extending in the thickness direction.

[0012] The pole design realizes the combination of copper and aluminum materials through the reasonable combination of the plate body portion, the connecting portion and the column portion, which not only ensures the electrical conductivity of the pole, but also reduces the cost and weight. At the same time, the embedding design of the accommodating groove and the folded edge region enhances the structural stability of the pole and improves the current transmission efficiency. This design enables the pole to better play the role of current transmission and structural support in the battery, improving the overall performance of the battery.

[0013] In other embodiments, the plate body portion is provided with a cross rib on both side walls in the width direction of the second accommodating groove; the folded edge region includes a first folded edge and a second folded edge distributed side by side in the width direction, the folded edge region being in an unfolded state, the first folded edge and the second folded edge being in the same plane; in the combined state of the connecting portion and the plate body portion, the first folded edge and the second folded edge are perpendicular to each other and cover the cross rib, and the second folded edge is located between the side wall in the width direction and the side wall of the plate body portion to form a welded portion by welding.

[0014] The cross rib increases the strength of the plate body portion, and also provides better positioning and support for the folded edge region of the connecting portion. The covering and welding design of the folded edge region and the cross rib further enhances the structural stability of the pole, reduces the risk of loosening and falling off at the connection, and improves the reliability and service life of the pole.

[0015] In other embodiments, in the thickness direction, the dimension of the end surface of the cross rib close to the first end surface S to the first end surface S is h1, the thickness of the cross rib is h2, the maximum thickness of the plate body part is h, and the following is satisfied: (h1+h2) / h=0.6~0.75;

[0016] And / or, the dimension of the first folded edge 132a in the width direction is the same as the height h1 of the cross rib, the dimension of the second folded edge 132b in the width direction is b, and the following is satisfied: 0.5mm≤b≤1.5mm.

[0017] Through reasonable size ratio design, it is ensured that the cross rib does not have excessive impact on the overall structure of the plate body part while enhancing the strength of the plate body part. At the same time, the appropriate length of the second folded edge ensures the strength and reliability of the welding part, and improves the overall performance of the pole.

[0018] In other embodiments, the planar area and the folded edge area are in the same plane when the connecting part is in the unfolded state, and the planar area and the folded edge area are arranged perpendicularly when the connecting part is in the folded state.

[0019] The design of the unfolded and folded states facilitates the processing and installation of the connecting part, so that the connecting part can be better embedded in the plate body part to form a stable overall structure. At the same time, the perpendicular arrangement also improves the overall strength of the pole, which can withstand greater force and vibration.

[0020] In other embodiments, the cross section of the pole body part perpendicular to the thickness direction is in a runway type structure, the straight edge of the runway type structure is parallel to the length direction of the plate body part, the dimension of the runway type structure in the length direction is m, the dimension of the pole body part in the width direction is d1, the dimension of the connecting part in the length direction is L, and the distance between the two second accommodating grooves in the plate body part in the width direction is d2, and the following is satisfied: L / m=1.5~5; d1 / d2=0.3~0.8.

[0021] The pole body part in the runway type structure design enables the pole to more evenly distribute stress when under stress, improving the stability and reliability of the pole. At the same time, the reasonable size ratio design ensures the overall performance and structural stability of the pole, so that the current can be uniformly transmitted, avoiding problems such as structural instability or poor current transmission caused by unsuitable size ratio.

[0022] In other embodiments, the plate body part and the connecting part are both of conductive material, and the materials of the two are different.

[0023] By using the plate body part and the connecting part of different materials, the advantages of the two metals are combined, which not only ensures the basic conductivity requirement of the pole, but also improves the conductivity efficiency when connected with the pole tab. This design enables the pole to better play the role of current transmission in the battery, reduces the internal resistance of the battery, and improves the charge and discharge performance of the battery.

[0024] In other embodiments, the column portion is located at the middle of the length and width of the plate portion, and the column portion and the plate portion are an integral structure.

[0025] The column portion is located at the middle of the plate portion, so that the pole column can more evenly distribute stress when under stress, improving the stability and reliability of the pole column. The design of the integral structure reduces the number of connections, reduces the risk of failure due to poor connection, and also improves production efficiency, reducing the process and error in the assembly process.

[0026] The second aspect of the application provides an electric core cover plate, comprising:

[0027] The cover plate body has a mounting hole;

[0028] The pole column described above, wherein the column portion penetrates the mounting hole, the plate portion has a consistent length direction, width direction and thickness direction with the cover plate body, and the plate portion is located on the first side of the thickness direction of the cover plate body;

[0029] The riveting block is riveted on the second side of the thickness direction of the cover plate body and the column portion;

[0030] The second plastic part is arranged around the column portion and extends on the surface of the cover plate body close to the plate portion, and the second plastic part is at least partially between the cover plate body and the plate portion;

[0031] The first plastic part is arranged around the column portion and extends on the surface of the cover plate body close to the riveting block, and the first plastic part is at least partially between the cover plate body and the riveting block;

[0032] The sealing ring is arranged around the column portion and at least partially between the cover plate body and the annular gap of the column portion.

[0033] The electric core cover plate realizes multiple functions such as current transmission, packaging of internal structure of the battery and electrical connection through reasonable structural design, including the pole column, the cover plate body, the riveting block, the first plastic part, the second plastic part and the sealing ring. At the same time, by optimizing the connection mode and layout between the components, the overall performance and reliability of the electric core cover plate are improved, ensuring the safety and stability of the battery.

[0034] In other embodiments, the second plastic part has a sink groove on the side close to the plate portion, and the plate portion is embedded in the sink groove.

[0035] The design of the sink groove enables the plate portion to be more stably embedded in the second plastic part, enhancing the connection strength between the two. At the same time, the sink groove can also play a certain positioning role for the plate portion, facilitating positioning and operation during installation. This embedding method can reduce the gap between the plate portion and the second plastic part, improving the overall sealing and stability of the electric core cover plate.

[0036] A third aspect of the present invention provides a battery including the cell cover described above. Applying the cell cover to the battery results in improved battery performance and reliability. As a crucial component of the battery, the design and quality of the cell cover directly affect the overall performance of the battery. By employing the cell cover of the present invention, the charge-discharge performance, safety, and stability of the battery can be effectively improved, extending its lifespan and providing reliable energy support for people's lives and work. Attached Figure Description

[0037] Figure 1 This is an exploded structural diagram of the battery cell cover assembly of this application.

[0038] Figure 2 This is a three-dimensional structural diagram of the pole in this application.

[0039] Figure 3 This is a three-dimensional structural diagram of the pole column from another perspective in this application.

[0040] Figure 4 This is the front view of the pole in this application.

[0041] Figure 5 for Figure 4 A sectional view along line A.

[0042] Figure 6 for Figure 4 Top view.

[0043] Figure 7 for Figure 6 Sectional view along line B.

[0044] Figure 8 This is a three-dimensional structural diagram of the column and plate parts in the connected state of this application.

[0045] Figure 9 for Figure 8 A schematic diagram of the three-dimensional structure from another perspective.

[0046] Figure 10 This is a top view of the connecting part in this application.

[0047] Figure 11 for Figure 10 Sectional view and enlarged view along the C-axis.

[0048] Figure label:

[0049] 100. Terminal post; 200. Cover plate body; 500. Riveting block; 400. Second plastic part; 300. First plastic part; 600. Sealing ring;

[0050] 110, columnar portion; 120, plate portion; 130, connecting portion; 140, welding portion;

[0051] 121, accommodation groove group; 121a, first accommodation groove; 121b, second accommodation groove; 122, cross rib;

[0052] 131, planar region; 132, hem region; 132a, first hem; 132b, second hem; 133, V-shaped groove. DETAILED DESCRIPTION

[0053] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0054] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0055] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0056] In the present application, unless specifically defined otherwise, if there are terms such as "mount", "connect", "connect", "fix", and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless specifically defined otherwise, if there are similar descriptions such as "first feature on" or "second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0058] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0059] In the related art, the plate-shaped structure is rarely coated, for many reasons. First, space occupation is a major problem. The plate-shaped structure has a large area in the length and width directions, and coating it will occupy additional internal space of the battery. At present, the battery is pursuing miniaturization and high energy density, and the internal space is extremely valuable. Excessive space occupied by the coating layer will limit the improvement of battery capacity and affect the overall performance of the battery. Second, it has a significant effect on the connection. The plate-shaped structure needs to be tightly connected with other components, and the coating layer may interfere with the welding or crimping process during the connection process. For example, during welding, the coating layer may melt and produce impurities, affecting the welding quality, increasing the contact resistance, increasing the internal resistance of the battery, reducing the charge and discharge efficiency, and possibly causing local overheating and other problems. Third, the cost factor cannot be ignored. The plate-shaped structure has various shapes, and the coating process requires more complex and precise equipment and processes, which will undoubtedly increase production costs, and for large-scale production enterprises, the cost pressure is greater. Therefore, considering various factors, the related art usually only considers coating the pole column of the columnar part. However, the present application mainly studies the coating of the plate-shaped structure and aims to explore new solutions.

[0060] As shown in Figures 2-11 The embodiment discloses a pole column, which comprises a plate body part 120, a connecting part 130 and a column part 110, and the materials of the plate body part 120 and the column part 110 are aluminum, and the material of the connecting part 130 is copper. By adopting this composite structure, the aluminum material has the characteristics of light weight, relatively low cost and good electrical conductivity, and its application in the plate body part 120 and the column part 110 can reduce the overall weight of the pole column to a certain extent, reduce the production cost, and at the same time ensure the basic electrical conductivity requirement. The copper material has more excellent electrical conductivity, and the connecting part 130 adopts the copper material, which can better meet the requirement of high electrical conductivity when connecting with the pole lug. The design of this copper-aluminum composite structure combines the advantages of the two metals, optimizes the cost and weight while ensuring the overall performance of the pole column, and provides strong support for the efficient operation of the battery.

[0061] In the related art, there are also structures for coating the pole column, but most of these coating designs are concentrated on the pole column of the columnar part, and the coating of the plate-shaped structure is extremely rare. The plate-shaped structure in the battery may be the plate-shaped part of the pole column itself, or it may be a welding block connecting the pole column and the pole lug, and plays a key role in current transmission and structural connection.

[0062] As shown in Figure 7As shown in FIG. 9, the plate body 120 has a flat structure, and the length direction, the width direction and the thickness direction are defined based on the plate body 120, that is, the plate body 120 is a square structure by default. The square structure of the plate body 120 can provide better stability and positioning accuracy when connected with other components. During the assembly of the battery, the positional relationship between the components needs to be accurately controlled, and the square structure of the plate body 120 can facilitate the connection with other components and reduce installation errors.

[0063] Generally, as shown in FIG. 10, the plate body 120 is a welding block or a connecting block for connecting the columnar pole with the tab, and has a rectangular plate structure. The rectangular plate structure of the plate body 120 can provide a larger contact area, and more welding positions can be provided when the plate body 120 is welded with the tab, thereby enhancing the welding firmness. Meanwhile, the structure is also conducive to the uniform distribution of current and reduces the problem of local overheating caused by excessive current. Figures 7-9 The plate body 120 has a first end surface S1 and a second end surface S2 opposite to each other in the thickness direction, and the second end surface S2 is provided with a first accommodating groove 121a extending in the width direction. It can be understood that the first accommodating groove 121a is a groove formed by cutting part of the structure on the second end surface S2 in the thickness direction. The first accommodating groove 121a is provided to be fitted with the connecting part 130. Through the fitting structure, the connection strength between the plate body 120 and the connecting part 130 can be enhanced, and the loosening or falling off of the plate body 120 during use can be prevented. Moreover, the fitting manner can also reduce the contact resistance at the connection and improve the transmission efficiency of the current.

[0064] As shown in FIG. 11, the plate body 120 is provided with a second accommodating groove 121b extending in the thickness direction on each end surface in the width direction. The second accommodating groove 121b cooperates with the first accommodating groove 121a to provide a mounting space for the connecting part 130. The multi-groove design can make the connecting part 130 more stably embedded in the plate body 120, and further improve the reliability of the connection. Meanwhile, the existence of multiple accommodating grooves can also help to disperse the stress at the connection and reduce the structural damage caused by stress concentration. Figure 9 As shown in FIG. 12, the plate body 120 is provided with a second accommodating groove 121b extending in the thickness direction on each end surface in the width direction. The second accommodating groove 121b cooperates with the first accommodating groove 121a to provide a mounting space for the connecting part 130. The multi-groove design can make the connecting part 130 more stably embedded in the plate body 120, and further improve the reliability of the connection. Meanwhile, the existence of multiple accommodating grooves can also help to disperse the stress at the connection and reduce the structural damage caused by stress concentration.

[0065] Figure 10 As shown in FIG. 13, the plate body 120 is provided with a second accommodating groove 121b extending in the thickness direction on each end surface in the width direction. The second accommodating groove 121b cooperates with the first accommodating groove 121a to provide a mounting space for the connecting part 130. The multi-groove design can make the connecting part 130 more stably embedded in the plate body 120, and further improve the reliability of the connection. Meanwhile, the existence of multiple accommodating grooves can also help to disperse the stress at the connection and reduce the structural damage caused by stress concentration. Figure 11 ​As shown, the connecting portion 130 in this embodiment has a planar region 131 and folded edge regions 132 on both side walls of the planar region 131 in the width direction. The planar region 131 is complementaryly embedded in the first receiving groove 121a, and the folded edge regions 132 are complementaryly embedded in the second receiving groove 121b. This allows the plate portion 120 and the connecting portion 130 to form a complete cuboid structure after connection, meaning that all six surfaces of the plate portion 120 and the connecting portion 130 are smooth planes. This complete cuboid structure is not only aesthetically pleasing, but more importantly, it reduces friction and interference with other components, improving the overall performance of the battery. The smooth surface reduces resistance during current transmission, reducing energy loss. Simultaneously, it also facilitates battery heat dissipation, preventing localized overheating from affecting battery life and safety.

[0066] In this embodiment, both the plate portion 120 and the connecting portion 130 are made of conductive materials, and the materials of the two are different, which is determined according to the positive and negative poles of the electrode group they are in. Taking the pole being located at the negative pole of the electrode group as an example, the negative pole tab is usually made of copper. At this time, the plate portion 120 is made of aluminum, while the connecting portion 130 is made of copper. The tab welding area is located on the connecting portion 130. Metals of the same material have a better welding effect, which can effectively reduce the resistance at the welding point, improve the current transmission efficiency, reduce the internal resistance of the battery, and improve the charging and discharging performance of the battery.

[0067] like Figures 1-6 As shown, since the connecting part 130 only covers a portion of the plate body 120 and does not completely cover the entire bottom surface of the connecting part 130, and the plate body 120 extends into a tab in the length direction for addressing during welding, the length direction of the plate body 120 cannot be completely filled with welding, leaving a certain width for welding positioning deviation. This structure also facilitates positioning with the aluminum part during copper plate assembly, avoiding misalignment. This structural design fully considers the operational needs of the actual welding process. During welding, a certain amount of space is required for positioning and adjustment to ensure welding accuracy. The tab extending from the plate body 120 in the length direction provides just such space. At the same time, this structure also facilitates the assembly between the copper plate (connecting part 130) and the aluminum plate (plate body 120). Through reasonable positioning design, misalignment between the two can be avoided during assembly, ensuring the overall quality and performance of the pole.

[0068] Meanwhile, in this embodiment, such as Figures 1-6As shown, the plate body part 120 and the connecting part 130 form a complete cube structure through fitting, which can also optimize the space. In the design of the battery, the space is usually very limited. The copper-aluminum composite structure of the pole column can fully utilize the limited space and realize the reasonable compounding of copper-aluminum materials. At the same time, the connecting part 130 of copper material is connected with the tab of the same material, which can ensure the efficient transmission of current and improve the performance of the battery. This space-optimized design is of great significance for small and high-performance battery products.

[0069] As shown in Figures 1-6 , the column part 110 in the embodiment is arranged on the first end surface S1 and extends in the thickness direction, and the projection of the column part 110 in the thickness direction is located in the coverage area of the second accommodating groove 121b, which is beneficial to improve the current flow efficiency. Because the connecting part 130 is welded with the tab, the current is transmitted from the connecting part 130 position, and the projection of the column part 110 in the thickness direction is just located at the position of the connecting part 130, so that the path of the current transmission from the connecting part 130 to the column part 110 is more direct and smooth. This design reduces the turning and obstruction of the current in the transmission process, reduces the resistance, and improves the transmission efficiency of the current. It can improve the charging and discharging speed of the battery, reduce energy loss, and prolong the service life of the battery.

[0070] In the embodiment, as shown in Figure 8 and Figure 9 , the first accommodating groove 121a and the second accommodating groove 121b are aligned and communicated with each other to form a U-shaped accommodating groove group 121, and the connecting part 130 is formed by folding into a U-shaped structure complementary to the shape of the accommodating groove group 121, and the connecting part 130 is embedded into the accommodating groove group 121 and fixed by welding to form a whole. The U-shaped accommodating groove group 121 and the connecting part 130 complementary to the shape of the U-shaped accommodating groove group 121 are designed to make the fitting between them more closely and stably. The U-shaped connecting part 130 formed by folding can be better embedded into the accommodating groove group 121 and form a whole after welding and fixing. This whole structure has higher strength and stability, can withstand various forces and vibrations of the battery during use, and ensures the normal work of the pole column. At the same time, this design is also beneficial to improve the production efficiency and reduce the error in the assembly process.

[0071] In the embodiment, as shown in Figures 8-9As shown, the plate body part 120 is provided with a cross rib 122 on the two side walls in the width direction of the second accommodating groove 121b; meanwhile, the folded edge area 132 includes a first folded edge 132a and a second folded edge 132b distributed side by side in the width direction, and the first folded edge 132a and the second folded edge 132b are in the same plane in the unfolded state of the folded edge area 132; in the combined state of the connecting part 130 and the plate body part 120, the first folded edge 132a and the second folded edge 132b are perpendicular to each other and cover the cross rib 122, and the second folded edge 132b is welded between the side wall in the width direction and the side wall of the plate body part 120 to form a welded part 140. The cross rib 122 increases the strength of the two side walls of the plate body part 120 in the width direction of the second accommodating groove 121b, and also provides better positioning and support for the folded edge area 132 of the connecting part 130. When the connecting part 130 and the plate body part 120 are combined, the first folded edge 132a and the second folded edge 132b are perpendicular to each other and cover the cross rib 122, and this structure can further enhance the connection strength between the two. The second folded edge 132b is welded between the side wall of the plate body part 120 to form a welded part 140, so that the connection is more firm, the risk of loosening and falling off at the connection is reduced, the reliability and service life of the pole are improved, and the connection effect of the two is improved through welding, the conductivity is improved, and the charging and discharging temperature is not too high.

[0072] As shown in the drawings, Figure 5 In the thickness direction, the dimension of the end face of the cross rib 122 close to the first end face S1 to the first end face S1 is h1, the thickness of the cross rib 122 is h2, and the maximum thickness of the plate body part 120 is h, and satisfy: (h1 + h2) / h = 0.6~0.75. It is ensured that the cross rib 122 enhances the strength of the plate body part 120 without causing excessive impact on the overall structure of the plate body part 120. The appropriate size ratio can make the cross rib 122 play the maximum role when bearing external force, and ensure that other parts of the plate body part 120 can work normally. If the size ratio is not appropriate, it may cause insufficient strength of the cross rib 122 or excessive local thickness of the plate body part 120, affecting the performance and installation of the pole.

[0073] In this embodiment, it also satisfies: h2=h-2h1, because the height of h1 is basically equal to the thickness of the flat area 131, and the thickness of the folded edge area 132 is the same as that of the flat area 131, so it can be concluded that h2=h-2h1.

[0074] As shown in the drawings, Figure 5As shown, the width direction size of the first folded edge 132a is the same as the height h1 of the cross rib 122, and the width direction size of the second folded edge 132b is b, and 0.5mm≤b≤1.5mm is satisfied. The width direction size of the first folded edge 132a is the same as the height h1 of the cross rib 122, so that they can perfectly fit when combined, enhancing the stability of the connection. The limitation of the width direction size b of the second folded edge 132b is to ensure the strength and reliability of the welding part 140. If b is too small, the welding area is insufficient, which may cause the welding to be not firm; if b is too large, it may increase the weight and cost of the connecting part 130, and also affect the overall structure of the pole.

[0075] As shown in Figure 10 and Figure 11 In this embodiment, when the connecting part 130 is in the unfolded state, the planar region 131 and the folded edge region 132 are in the same plane, and when the connecting part 130 is in the folded state, the planar region 131 and the folded edge region 132 are arranged perpendicularly. This design of unfolded and folded state facilitates the processing and installation of the connecting part 130. During processing, the connecting part 130 can be produced in an unfolded state, which is convenient for various processing operations. When installing, it is folded into a U-shaped structure complementary to the shape of the accommodating groove set 121, which can better embed into the plate body part 120. The perpendicular arrangement of the planar region 131 and the folded edge region 132 makes the connecting part 130 better withstand external forces after combination, improving the overall strength of the pole.

[0076] In this embodiment, as shown in Figure 10 and Figure 11 A V-shaped groove 133 is arranged between the planar region 131 and the folded edge region 132 in the connecting part 130; a V-shaped groove 133 is arranged between the first folded edge 132a and the second folded edge 132b, which facilitates folding, improves folding effect, and makes the connection between the two more compact. At the same time, since the thickness of the connecting part 130 is usually 0.5mm-1.5mm, the thickness is very thin, and the metal has ductility, so that the folded connecting part 130 can be clamped onto the plate body part 120.

[0077] As shown in Figure 2As shown, in this embodiment, the cross-section of the column portion 110 perpendicular to the thickness direction is a racetrack-shaped structure. The straight edge of the racetrack-shaped structure is parallel to the length direction of the plate portion 120, and the spacing of the racetrack-shaped structure in the length direction is m. Since the racetrack-shaped structure includes a straight edge and a protective edge, the dimension in the width direction of the racetrack-shaped structure is not unique. In this application, m is the spacing of the racetrack-shaped structure in the centerline region in the length direction. The spacing of the column portion 110 in the width direction is d1. Similarly, in this embodiment, d1 is the width of the centerline region of the column portion 110. The dimension of the connecting portion 130 in the length direction is L, and the spacing of the two second receiving grooves 121b in the plate portion 120 in the width direction is d2, satisfying: L / m = 1.5~5; d1 / d2 = 0.3~0.8. The straight edge of the column portion 110 of the racetrack-shaped structure is parallel to the length direction of the plate portion 120, which can better connect and cooperate with the plate portion 120. The size ratio is limited to ensure the overall performance and structural stability of the pole. A ratio of L / m = 1.5~5 ensures a suitable dimensional match between the connecting part 130 and the pole part 110 in the width direction, guaranteeing uniform current transmission. A ratio of d1 / d2 = 0.3~0.8 considers the dimensional coordination between the pole part 110 and the plate part 120 in the length direction, avoiding structural instability or poor current transmission caused by unsuitable size ratios.

[0078] In this embodiment, the column portion 110 is located at the midpoint of the length and width directions of the plate portion 120, and the column portion 110 and the plate portion 120 are an integral structure. The central position of the column portion 110 in the plate portion 120 allows for a more uniform stress distribution on the pole when under load, improving the stability and reliability of the pole. The integral structure design reduces the number of connections, lowering the risk of failure due to poor connections. Simultaneously, the integral structure also improves production efficiency, reducing assembly processes and errors.

[0079] In this embodiment, h2 = h - 2h1; (h1 + h2) / h = 0.6~0.75. To test whether the push-pull force of the pole composed of different connection thicknesses and the highest temperature during charging at the same charging rate meet the requirements for cell use, the following embodiments and comparative examples are used to illustrate this:

[0080] Example 1

[0081] In this embodiment, the thickness of the electrode base plate is h=2mm. The performance of the electrode with different thicknesses h1 is tested to ensure that the electrode push-pull force is ≥1000N and the maximum charging temperature is ≤55℃. Refer to Table 1 and the following:

[0082] Comparative Example 1-1

[0083] In the thickness direction, the dimension h1 from the end face of the transverse rib 122 closest to the first end face S1 to the first end face S1 is 0.42 mm, the thickness h2 of the transverse rib 122 is 1.16 mm, and the maximum thickness h of the plate body 120 is 2 mm. The calculated value of (h1 + h2) / h is 0.79. Under these parameter settings, the push-pull force of the electrode reaches 1323 N, and the temperature rise of the electrode is 56.6 °C. This indicates that at this size ratio, the electrode can withstand a relatively large push-pull force, but the temperature rise is also relatively high, which may have a certain impact on the long-term stability and safety of the battery.

[0084] Comparative Examples 1-2

[0085] Compared to Comparative Example 1, h1 becomes 0.44 mm, h2 becomes 1.12 mm, and h remains 2 mm. At this point, (h1 + h2) / h = 0.78. The push-pull force of the pole piece decreases to 1293 N, and the pole piece temperature rise is 56.2 °C. It can be seen that with a slight increase in h1 and a corresponding decrease in h2, the push-pull force of the pole piece decreases, and the temperature rise also decreases slightly. This indicates that this change in the transverse rib size has a certain comprehensive impact on the pole piece performance.

[0086] Comparative Examples 1-3

[0087] h1 further increases to 0.46 mm, h2 decreases to 1.08 mm, and h remains at 2 mm, (h1 + h2) / h = 0.77. The push-pull force of the electrode continues to decrease to 1267 N, and the temperature rise of the electrode is 55.7 °C. This further verifies that as h1 increases and h2 decreases, the push-pull force of the electrode decreases, and the temperature rise also decreases, but the decrease is relatively small.

[0088] Comparative Examples 1-4

[0089] When h1 is 0.48 mm, h2 is 1.04 mm, and h is 2 mm, (h1 + h2) / h = 0.76. The push-pull force of the pole piece decreases to 1221 N, and the temperature rise of the pole piece is 55.3 °C. Continuous parameter changes cause the push-pull force of the pole piece to decrease continuously, and the temperature rise also decreases slowly in tandem, showing a linear correlation between the transverse rib size and the performance of the pole piece.

[0090] Example 1-1

[0091] h1 is 0.5mm, h2 is 1mm, h is 2mm, and (h1 + h2) / h = 0.75. At this point, the terminal push-pull force is 1178N, and the terminal temperature rise is 55℃. Compared to the aforementioned comparative example, Example 1-1 continues the parameter adjustment along the direction of increasing h1 and decreasing h2, further reducing the terminal push-pull force and temperature rise. This indicates that such parameter adjustment has a certain effect on optimizing battery performance, but the relationship between push-pull force and temperature rise needs to be balanced.

[0092] Examples 1-2

[0093] h1 increases to 0.54 mm, h2 decreases to 0.92 mm, h is 2 mm, and (h1 + h2) / h = 0.73. The terminal push-pull force is 1104 N, and the terminal temperature rise is 54.6 °C. With further changes in parameters, the terminal push-pull force and temperature rise continue to decrease, indicating that adjusting the transverse rib size within a reasonable range can improve the battery's temperature rise performance, but it will also sacrifice some terminal push-pull force.

[0094] Examples 1-3

[0095] h1 is 0.58 mm, h2 is 0.84 mm, h is 2 mm, and (h1 + h2) / h = 0.71. The push-pull force of the electrode pillar decreases to 1053 N, and the temperature rise of the electrode pillar is 54.1 °C. It can be seen that as the value of (h1 + h2) / h continues to decrease, both the push-pull force and the temperature rise of the electrode pillar gradually decrease. This provides a direction for the optimization of parameters in battery structure design, namely, balancing the mechanical and thermal properties of the electrode pillar by adjusting the proportion of the transverse rib dimensions.

[0096] Examples 1-4

[0097] h1 is 0.8 mm, h2 is 0.4 mm, h is 2 mm, and (h1 + h2) / h = 0.6. The terminal push-pull force is 1000 N, and the terminal temperature rise is 53.3 °C. Compared with the previous comparative examples and embodiments, the (h1 + h2) / h value in Examples 1-4 is significantly reduced, and the terminal push-pull force also decreases accordingly to 1000 N, but the temperature rise is reduced to 53.3 °C. This indicates that after reaching a certain parameter range, further adjusting the transverse rib size can further optimize the temperature rise performance to a certain extent, but it is necessary to closely monitor the changes in the terminal push-pull force to ensure the mechanical reliability of the battery structure.

[0098] Comparative Examples 1-5

[0099] h1 is 0.82 mm, h2 is 0.36 mm, h is 2 mm, and (h1 + h2) / h = 0.59. The terminal push-pull force is 983 N, and the terminal temperature rise is 52.4 °C. Compared with Examples 1-4, h1 continues to increase, h2 continues to decrease, the (h1 + h2) / h value further decreases, and the terminal push-pull force also drops below 1000 N. Although the temperature rise is somewhat reduced, the reduction is relatively smaller. This indicates that when the (h1 + h2) / h value decreases to a certain extent, the optimization effect on temperature rise gradually weakens. At the same time, the decrease in terminal push-pull force may have an adverse impact on battery life and safety.

[0100] Comparative Examples 1-6

[0101] h1 is 0.84 mm, h2 is 0.32 mm, h is 2 mm, and (h1 + h2) / h = 0.58. The terminal push-pull force is 943 N, and the terminal temperature rise is 51.3 °C. With further changes in parameters, the terminal push-pull force continues to decrease, and the temperature rise also decreases. However, the overall trend shows that further reducing the (h1 + h2) / h value has limited effect on improving the temperature rise, and the decrease in terminal push-pull force may become a key factor restricting battery performance.

[0102] Comparative Examples 1-7

[0103] h1 is 0.85mm, h2 is 0.3mm, h is 2mm, and (h1 + h2) / h = 0.575. The terminal push-pull force is 903N, and the terminal temperature rise is 50.7℃. It can be seen that the terminal push-pull force has decreased to a low level, while the temperature rise reduction is not significant. This indicates that under the current parameter adjustment direction, continuing to pursue a further reduction in temperature rise may lead to the terminal push-pull force failing to meet the requirements for normal battery operation.

[0104] Comparative Examples 1-8

[0105] h1 is 0.87mm, h2 is 0.26mm, h is 2mm, and (h1 + h2) / h = 0.565. The push-pull force of the terminal post is 869N, and the temperature rise of the terminal post is 50.2℃. At this point, the push-pull force of the terminal post is already at a relatively low value, but the effect of reducing the temperature rise is not ideal. This indicates that excessively reducing the value of (h1 + h2) / h cannot effectively balance the mechanical and thermal properties of the terminal post, and may instead lead to a decrease in the overall performance of the battery.

[0106] Table 1

[0107]

[0108] Example 2

[0109] In this embodiment, the thickness of the electrode base plate is h=2.5mm. The performance of the electrode with different thicknesses h1 was tested to ensure that the electrode push-pull force is ≥1200N and the maximum charging temperature is ≤55℃. Refer to Table 2 and the following:

[0110] Comparative Example 2-1

[0111] In this comparative example, h1 is 0.5mm, h2 is 1.5mm, and h is 2.5mm. The calculated value of (h1 + h2) / h is 0.80. Under these parameter settings, the terminal push-pull force reached 1521N, and the terminal temperature rise was 56.8℃. This indicates that at this size scale, the terminal has a relatively strong push-pull force resistance. However, the high temperature rise may pose a potential threat to the long-term stable operation and safety of the battery, as excessively high temperatures may accelerate the aging of internal battery materials and affect battery life.

[0112] Comparative Example 2-2

[0113] Compared to Comparative Example 2-1, h1 increases to 0.53 mm, h2 decreases to 1.44 mm, and h remains unchanged at 2.5 mm. At this point, (h1 + h2) / h = 0.79. The push-pull force of the pole piece decreases to 1498 N, and the pole piece temperature rise is 56.4 °C. It can be seen that with a slight increase in h1 and a corresponding decrease in h2, the push-pull force of the pole piece decreases, and the temperature rise also decreases slightly. This indicates that this fine-tuning of the transverse rib dimensions has a comprehensive impact on the pole piece performance, affecting both mechanical strength and thermal properties.

[0114] Comparative Examples 2-3

[0115] h1 further increases to 0.56 mm, h2 decreases to 1.38 mm, and h remains at 2.5 mm, (h1 + h2) / h = 0.78. The push-pull force of the electrode post continues to decrease to 1469 N, and the temperature rise of the electrode post is 55.6℃. This further verifies that as h1 increases and h2 decreases, the push-pull force of the electrode post decreases, while the temperature rise also decreases synchronously, but the decrease is relatively small. This indicates that the effect of this parameter change on the electrode post performance is a gradual process.

[0116] Comparative Examples 2-4

[0117] When h1 is 0.6 mm, h2 is 1.3 mm, and h is 2.5 mm, (h1 + h2) / h = 0.76. The push-pull force of the pole piece decreases to 1412 N, and the temperature rise of the pole piece is 55.2 °C. Continuous parameter changes cause the push-pull force of the pole piece to decrease continuously, and the temperature rise also decreases, showing a certain linear correlation between the transverse rib size and the pole piece performance. However, this trend is not absolutely linear and is also potentially affected by other factors.

[0118] Example 2-1

[0119] h1 is 0.63mm, h2 is 1.24mm, h is 2.5mm, and (h1 + h2) / h = 0.75. At this point, the terminal push-pull force is 1371N, and the terminal temperature rise is 55℃. Compared to the aforementioned comparative example, Example 2-1 continues to adjust the parameters along the direction of increasing h1 and decreasing h2, further reducing the terminal push-pull force and temperature rise. This indicates that adjusting the transverse rib size within a reasonable range can optimize the battery's temperature rise performance, but it also sacrifices some terminal push-pull force; a balance needs to be struck between the two.

[0120] Example 2-2

[0121] h1 increases to 0.77 mm, h2 decreases to 0.96 mm, h is 2.5 mm, and (h1 + h2) / h = 0.69. The terminal push-pull force is 1314 N, and the terminal temperature rise is 54.4 °C. With further changes in parameters, the terminal push-pull force and temperature rise continue to decrease, indicating that adjusting the proportion of transverse rib dimensions can improve the battery's thermal performance to some extent. However, it is also important to monitor whether the decrease in mechanical performance is within an acceptable range to ensure the safety and reliability of the battery structure.

[0122] Example 2-3

[0123] h1 is 0.9 mm, h2 is 0.7 mm, h is 2.5 mm, and (h1 + h2) / h = 0.64. The push-pull force of the electrode drops to 1253 N, and the temperature rise of the electrode is 54 °C. It can be seen that as the value of (h1 + h2) / h continues to decrease, both the push-pull force and the temperature rise of the electrode gradually decrease. This provides a direction for the optimization of parameters in battery structure design, namely, balancing the mechanical and thermal properties of the electrode by reasonably adjusting the proportion of the transverse rib size, but it is necessary to precisely control the range of parameter changes.

[0124] Examples 2-4

[0125] h1 is 1 mm, h2 is 0.5 mm, h is 2.5 mm, and (h1 + h2) / h = 0.60. The terminal push-pull force is 1200 N, and the terminal temperature rise is 53.3 °C. Compared with the previous comparative examples and embodiments, the (h1 + h2) / h value in Examples 2-4 is significantly reduced, and the terminal push-pull force also decreases accordingly to 1200 N, but the temperature rise is reduced to 53.3 °C. This indicates that after reaching a certain parameter range, further adjusting the transverse rib size can further optimize the temperature rise performance to a certain extent. However, it is necessary to closely monitor the changes in the terminal push-pull force to ensure that the mechanical reliability of the battery structure can meet the requirements of actual use.

[0126] Comparative Examples 2-5

[0127] h1 is 1.03 mm, h2 is 0.44 mm, h is 2.5 mm, and (h1 + h2) / h = 0.59. The terminal push-pull force is 1181 N, and the terminal temperature rise is 52.2 °C. Compared with Examples 2-4, h1 continues to increase, h2 continues to decrease, the (h1 + h2) / h value further decreases, and the terminal push-pull force also drops below 1200 N. Although the temperature rise is somewhat reduced, the reduction is relatively smaller. This indicates that when the (h1 + h2) / h value decreases to a certain extent, the optimization effect on temperature rise gradually weakens. At the same time, the decrease in terminal push-pull force may have an adverse impact on battery life and safety, requiring a new balance between performance optimization and structural safety.

[0128] Comparative Examples 2-6

[0129] h1 is 1.05mm, h2 is 0.4mm, h is 2.5mm, and (h1 + h2) / h = 0.58. The terminal push-pull force is 1127N, and the terminal temperature rise is 51.1℃. With further changes in parameters, the terminal push-pull force continues to decrease, and the temperature rise also decreases. However, the overall trend shows that further reducing the (h1 + h2) / h value has limited effect on improving the temperature rise, and the decrease in terminal push-pull force may become a key factor restricting battery performance, requiring a reassessment of the rationality and feasibility of parameter adjustments.

[0130] Comparative Examples 2-7

[0131] h1 is 1.07mm, h2 is 0.36mm, h is 2.5mm, and (h1 + h2) / h = 0.57. The terminal push-pull force is 1087N, and the terminal temperature rise is 50.3℃. It can be seen that the terminal push-pull force has decreased to a low level, while the temperature rise reduction is not significant. This indicates that continuing to pursue a lower temperature rise under the current parameter adjustment direction may lead to the terminal push-pull force failing to meet the requirements for normal battery operation, necessitating a change in the parameter adjustment strategy.

[0132] Comparative Examples 2-8

[0133] h1 is 1.09 mm, h2 is 0.32 mm, h is 2.5 mm, and (h1 + h2) / h = 0.56. The push-pull force of the terminal post is 1021 N, and the temperature rise of the terminal post is 49.5℃. At this point, the push-pull force of the terminal post is already at a relatively low value, but the effect of reducing the temperature rise is not ideal. This indicates that excessively reducing the value of (h1 + h2) / h cannot effectively balance the mechanical and thermal properties of the terminal post, and may even lead to a decrease in the overall performance of the battery. It is necessary to re-examine the parameter selection principles of the battery structure design.

[0134] As shown in Table 2, data analysis of the above comparative examples and embodiments clearly demonstrates that the proportional relationship (h1 + h2) / h between the transverse rib dimensions h1 and h2 and the plate thickness h has a significant impact on the electrode push-pull force and electrode temperature rise. As the value of (h1 + h2) / h gradually decreases, the electrode push-pull force generally shows a downward trend, and the electrode temperature rise also decreases accordingly, but the rate of decrease gradually diminishes. In actual battery structure design, it is necessary to comprehensively consider the mechanical and thermal properties of the electrode to find a suitable range of (h1 + h2) / h values ​​to optimize battery performance.

[0135] Table 2

[0136]

[0137] Example 3

[0138] In this embodiment, the thickness of the electrode base plate is h=1.8mm. The performance of the electrode with different thicknesses h1 was tested to ensure that the electrode push-pull force is ≥800N and the maximum charging temperature is ≤55℃. Refer to Table 3 and the following:

[0139] Comparative Example 3-1

[0140] h1 is 0.37mm, h2 is 1.06mm, and h is fixed at 1.8mm. The calculated ratio of (h1 + h2) / h is 0.79. At this point, the push-pull force of the electrode reaches 1123N, demonstrating relatively strong mechanical load-bearing capacity; simultaneously, the electrode temperature rises to 56.8℃, indicating that under normal operating conditions, the electrode will generate a certain degree of heat accumulation.

[0141] Comparative Example 3-2

[0142] Compared to Comparative Example 3-1, h1 was slightly adjusted to 0.39 mm, h2 was correspondingly reduced to 1.02 mm, and h remained unchanged at 1.8 mm. The value of (h1 + h2) / h became 0.78. At this point, the push-pull force of the electrode decreased to 1043 N, a significant reduction; while the temperature rise of the electrode decreased to 56.2℃, showing some improvement, but the magnitude was relatively small. This indicates that the slight increase in h1 and the simultaneous decrease in h2 both affected the mechanical and thermal properties of the electrode, with the decrease in mechanical properties being more significant.

[0143] Comparative Example 3-3

[0144] h1 increases to 0.41 mm, h2 further decreases to 0.98 mm, and h remains at 1.8 mm, (h1 + h2) / h = 0.77. The electrode push-pull force continues to decline to 997 N, while the electrode temperature rises to 55.6 °C. It can be seen that as the inverse changes in h1 and h2 continue, both the electrode push-pull force and the temperature rise show a decreasing trend, but the rate of temperature decrease is relatively slow, indicating that within the current parameter adjustment range, the optimization effect on temperature rise is limited.

[0145] Comparative Examples 3-4

[0146] When h1 is 0.43 mm, h2 is 0.94 mm, and h is 1.8 mm, (h1 + h2) / h = 0.76. The push-pull force of the electrode post decreases to 965 N, and the temperature rise of the electrode post is 55.2 °C. Compared with the previous comparative examples, this parameter change trend continues, with the push-pull force of the electrode post continuously decreasing and the temperature rise also decreasing. However, the overall change rate gradually flattens out, suggesting that the effect of parameter adjustment on electrode post performance may have a marginal effect.

[0147] Example 3-1

[0148] In the implementation phase, h1 was adjusted to 0.45 mm, h2 to 0.9 mm, and h remained at 1.8 mm, with (h1 + h2) / h = 0.75. At this point, the electrode push-pull force was 905 N, and the electrode temperature rise was 55 °C. Compared to the aforementioned comparative example, Example 3-1 further explored parameter optimization, with the electrode push-pull force continuing to decrease, and the temperature rise also slightly decreasing. This indicates that adjusting parameters within a reasonable range can balance the mechanical and thermal properties of the electrode to a certain extent, but the magnitude of parameter changes needs to be precisely controlled.

[0149] Example 3-2

[0150] When h1 increases to 0.52 mm, h2 decreases to 0.76 mm, and h becomes 1.8 mm, (h1 + h2) / h = 0.71. The electrode push-pull force decreases to 879 N, and the electrode temperature rise is 54.4 °C. With increasing parameter adjustment, the electrode push-pull force further decreases, and the temperature rise decreases more significantly. This indicates that within a certain parameter range, by reasonably adjusting the ratio of h1 to h2, the temperature rise characteristics of the electrode can be effectively improved, but at the same time, a certain loss of mechanical properties must be tolerated.

[0151] Example 3-3

[0152] h1 is 0.6 mm, h2 is 0.6 mm, h is 1.8 mm, and (h1 + h2) / h = 0.67. The electrode push-pull force is 856 N, and the electrode temperature rise is 54.1 °C. Under these parameter settings, the electrode push-pull force and temperature rise continue to show a decreasing trend, but the rate of decrease has slowed down. This indicates that as the parameters are adjusted further, the sensitivity of the electrode performance to parameter changes gradually decreases, requiring more precise parameter adjustments to achieve further performance optimization.

[0153] Examples 3-4

[0154] h1 is 0.72mm, h2 is 0.36mm, h is 1.8mm, and (h1 + h2) / h = 0.60. The terminal push-pull force is reduced to 800N, and the terminal temperature rise is 53.6℃. Compared with the previous embodiment, the value of (h1 + h2) / h is significantly reduced under this set of parameters, and the terminal push-pull force is also reduced to 800N accordingly, while the temperature rise is reduced to 53.6℃. This shows that after the parameters are adjusted to a certain extent, the optimization effect on temperature rise still exists, but the impact of the reduction in terminal push-pull force on the overall mechanical reliability of the battery needs to be weighed.

[0155] Comparative Examples 3-5

[0156] h1 is 0.74 mm, h2 is 0.32 mm, h is 1.8 mm, and (h1 + h2) / h = 0.59. The terminal push-pull force is 783 N, and the terminal temperature rise is 52.7 °C. Compared with Examples 3-4, h1 continues to increase, h2 continues to decrease, and the (h1 + h2) / h value further decreases. The terminal push-pull force drops below 800 N, and although the temperature rise decreases somewhat, the reduction is relatively smaller. This indicates that when the parameters are adjusted to a certain limit, the effect of further reducing the (h1 + h2) / h value on optimizing the temperature rise gradually weakens. At the same time, the decrease in the terminal push-pull force may pose a potential threat to the battery's lifespan and safety.

[0157] Comparative Examples 3-6

[0158] h1 is 0.76mm, h2 is 0.28mm, h is 1.8mm, and (h1 + h2) / h = 0.58. The terminal push-pull force is 748N, and the terminal temperature rise is 51.7℃. With further extreme adjustments to the parameters, the terminal push-pull force continues to decrease, and the temperature rise also decreases. However, the overall trend shows that continuing to pursue a reduction in temperature rise may cause the terminal push-pull force to fail to meet the minimum mechanical requirements for normal battery use, thereby affecting the overall performance and reliability of the battery.

[0159] Comparative Examples 3-7

[0160] h1 is 0.77mm, h2 is 0.26mm, h is 1.8mm, and (h1 + h2) / h = 0.57. The terminal push-pull force is 723N, and the terminal temperature rise is 50.8℃. It can be seen that the terminal push-pull force has decreased to a low level, while the temperature rise reduction is not significant. This indicates that under the current parameter adjustment direction, excessively pursuing a reduction in temperature rise is no longer practically meaningful and may even lead to serious damage to the battery's mechanical properties.

[0161] Comparative Examples 3-8

[0162] h1 is 0.79mm, h2 is 0.22mm, h is 1.8mm, and (h1 + h2) / h = 0.56. The push-pull force of the terminal post is 689N, and the temperature rise of the terminal post is 50.5℃. At this point, the push-pull force of the terminal post is already at an extremely low value, and the effect of reducing the temperature rise is almost negligible. This fully demonstrates that excessively reducing the value of (h1 + h2) / h cannot effectively balance the mechanical and thermal properties of the terminal post. On the contrary, it will cause a significant decrease in the overall performance of the battery, and may even prevent it from working properly.

[0163] As shown in Table 3, through comprehensive data analysis of the above comparative examples and embodiments, it can be clearly concluded that the proportional relationship (h1 + h2) / h between the transverse rib dimensions h1 and h2 and the plate thickness h has a significant impact on the electrode push-pull force and electrode temperature rise. As the value of (h1 + h2) / h gradually decreases, the electrode push-pull force generally shows a downward trend, and the electrode temperature rise also decreases accordingly, but the rate of decrease gradually diminishes and there is a marginal effect. In actual battery structure design, the mechanical and thermal properties of the electrode must be comprehensively considered to find an optimal range of (h1 + h2) / h values.

[0164] Table 3

[0165]

[0166] As shown in Table 3, the above cases show that when (h1+h2) / h = 0.6~0.75, the test pole push-pull force and the highest temperature during charging at the same charging rate meet the requirements for cell use; when (h1+h2) / h > 0.75, the connection part is thinner, the conductivity is poorer, and the temperature rise is higher; since the pole body mainly affects the mechanical properties of the pole, when (h1+h2) / h < 0.6, the thickness of the pole body base plate is thinner (h1+h2), and the push-pull force does not meet the requirements.

[0167] Example 4

[0168] like Figure 1 As shown, this embodiment discloses a battery cell cover plate, comprising:

[0169] The cover plate body 200 has mounting holes; the mounting holes arranged along the thickness direction provide a position for the installation of the pole post 100. The design of the mounting holes needs to take into account the size and shape of the pole post 100 to ensure that the pole post 100 can be accurately installed in them.

[0170] In this embodiment, the electrode post 100 has a column portion 110 that penetrates the mounting hole, and a plate portion 120 that has the same length, width, and thickness direction as the cover plate body 200. The plate portion 120 is located on one side of the cover plate body 200 in the thickness direction. When the electrode post 100 from embodiments one through three is applied to the cell cover plate, the column portion 110 penetrates the mounting hole, allowing the electrode post 100 to connect with the cover plate body 200. The plate portion 120 and the cover plate body 200 have the same direction, facilitating positioning and operation during installation and use. The plate portion 120 is located on the first side of the cover plate body 200 in the thickness direction; this layout is beneficial for current transmission and connection with other components.

[0171] The riveting block 500 is riveted to the post portion 110 on the second side (wherein the first side and the second side are arranged opposite each other) in the thickness direction of the cover plate body 200. The function of the riveting block 500 is to further fix the pole post 100. By riveting it to the post portion 110, the connection strength between the pole post 100 and the cover plate body 200 is enhanced. Riveting is a reliable connection method that can withstand greater forces and vibrations, ensuring the stability of the battery cell cover plate during use.

[0172] A second plastic component 400 is arranged around the column portion 110 and extends on the surface of the cover plate body 200 near the plate portion 120, and the second plastic component 400 is at least partially located between the cover plate body 200 and the plate portion 120; the second plastic component 400 has multiple functions. Its arrangement around the column portion 110 provides insulation and protection, preventing short circuits or collisions between the column portion 110 and other components. Simultaneously, the partial location of the second plastic component 400 between the cover plate body 200 and the plate portion 120 enhances the connection stability between the two, reducing loosening caused by vibration or external forces.

[0173] A first plastic component 300 extends around the column portion 110 and onto the surface of the cover body 200 near the riveting block 500, and is at least partially located between the cover body 200 and the riveting block 500. Similar to the second plastic component 400, the first plastic component 300 also serves an insulating and protective function. Its arrangement around the column portion 110 prevents short circuits or poor contact between the column portion 110 and the riveting block 500. Simultaneously, the partial location of the first plastic component 300 between the cover body 200 and the riveting block 500 enhances the connection strength between them and improves the overall reliability of the battery cell cover.

[0174] A sealing ring 600 is arranged around the pillar portion 110 and at least partially between the cover body 200 and the pillar portion 110 in the annular gap. The main function of the sealing ring 600 is to seal and prevent leakage of electrolyte or other substances inside the battery. Its arrangement around the pillar portion 110 and filling the annular gap between the cover body 200 and the pillar portion 110 effectively prevents leakage and ensures the safety and stability of the battery.

[0175] The second plastic part 400 has a recessed groove on the side near the plate part 120, and the plate part 120 is embedded in the recessed groove. The recessed groove design allows the plate part 120 to be more stably embedded in the second plastic part 400, enhancing the connection strength between the two. At the same time, the recessed groove also provides a certain positioning function for the plate part 120, facilitating positioning and operation during installation. This embedding method reduces the gap between the plate part 120 and the second plastic part 400, improving the overall sealing and stability of the cell cover.

[0176] Example 5

[0177] This embodiment discloses a battery, including a cell cover plate as described in Embodiment 4. Applying the cell cover plate from Embodiment 4 to the battery results in improved performance and reliability. As a crucial component of the battery, the design and quality of the cell cover plate directly impact its overall performance. The cell cover plate in Embodiment 4, through its rational structural design, including the cooperation of the terminal post 100, cover plate body 200, riveting block 500, first plastic part 300, second plastic part 400, and sealing ring 600, effectively improves the battery's charge-discharge performance, safety, and stability. This battery can be widely used in various electronic devices, electric vehicles, and other fields, providing reliable energy support for people's lives and work.

[0178] 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.

[0179] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electrode post, characterized in that, include: The plate portion has a flat structure. Based on the plate portion, the length direction, width direction and thickness direction are defined. The plate portion has a first end face and a second end face opposite to each other in the thickness direction. The second end face has a first receiving groove extending in the width direction. The two end faces of the plate portion in the width direction have a second receiving groove extending in the thickness direction. The connecting part has a planar area and folded edge areas on both side walls in the width direction of the planar area. The planar areas are complementaryly embedded in the first receiving groove, and the folded edge areas are complementaryly embedded in the second receiving groove. A cylindrical portion is disposed on the first end face and extends in the thickness direction; The plate portion and the column portion are made of aluminum, and the connecting portion is made of copper; The plate body has transverse ribs on both sides of the second accommodating groove in the width direction; The folded area includes a first fold and a second fold that are arranged side by side in the width direction; When the connecting part and the plate part are in the combined state, the first folded edge and the second folded edge are perpendicular to each other and cover the horizontal rib, and the second folded edge is welded between the side wall in the width direction and the side wall of the plate part to form a welded part. In the thickness direction, the dimension from the end face of the transverse rib near the first end face to the first end face is h1, the thickness of the transverse rib is h2, the maximum thickness of the plate body is h, and satisfies: (h1+h2) / h=0.6~0.

75.

2. The pole post according to claim 1, characterized in that, The first fold in the width direction has the same dimension h1 as the dimension from the end face of the transverse rib near the first end face to the first end face. The second fold in the width direction has a dimension b, which satisfies: 0.5mm≤b≤1.5mm.

3. The pole post according to claim 2, characterized in that, When the connecting part is in the unfolded state, the flat area and the folded edge area are on the same plane; when the connecting part is in the folded state, the flat area and the folded edge area are perpendicular to each other.

4. The pole post according to claim 3, characterized in that, The column portion has a racetrack-shaped cross-section perpendicular to the thickness direction. The straight edge of the racetrack-shaped structure is parallel to the length direction of the plate portion. The length dimension of the racetrack-shaped structure is m. The width dimension of the column portion is d1. The length dimension of the connecting portion is L. The distance between the two second receiving grooves in the plate portion in the width direction is d2, and the following conditions are met: L / m = 1.5~5; d1 / d2 = 0.3~0.

8.

5. The pole post according to claim 1, characterized in that, The column portion is located at the midpoint of the length and width directions of the plate portion, and the column portion and the plate portion are an integral structure.

6. A battery cell cover plate, characterized in that, include: The cover plate body has mounting holes; The pole post as described in any one of claims 1-5, wherein the post body penetrates the mounting hole, the plate body and the cover plate body have the same length direction, width direction and thickness direction, and the plate body is located on the first side of the cover plate body in the thickness direction; The rivet block is riveted to the column part on the second side in the thickness direction of the cover plate body; The second plastic part extends around the column portion and on the surface of the cover plate body near the plate portion, and the second plastic part is at least partially located between the cover plate body and the plate portion; A first plastic part is arranged around the column portion and extending on the surface of the cover plate body near the rivet block, and the first plastic part is at least partially located between the cover plate body and the rivet block. A sealing ring is arranged around the column portion and at least partially between the cover plate body and the column portion in annular gap.

7. A cell cover plate according to claim 6, characterized in that, The second plastic part has a recessed groove on the side near the plate body, and the plate body is embedded in the recessed groove.

8. A battery, characterized in that, It includes a cell cover as described in claim 6.

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