Pole extension piece, single battery assembly and single battery pole

Abstract

The utility model belongs to the field of batteries, and particularly relates to a pole extension piece, a single battery assembly and a single battery pole. The problem that a traditional low-height pole is difficult to connect is solved. The pole extension piece comprises a pole extension piece body, and a mounting hole is formed in the pole extension piece body; each single battery assembly comprises a single battery and a pole extension piece; partial structure of the pole is inserted into the mounting hole, so that the pole extension piece body is connected with the pole, and the top end of the pole extension piece body is higher than that of the pole; the single battery pole comprises a pole body, an annular step structure is arranged in the circumferential direction of the pole body, a pole small-diameter section is used for being inserted into a mounting hole of a pole extension piece, and a step surface serves as a limiting surface and is used for supporting the pole extension piece. According to the utility model, the pole and the pole extension piece are firmly combined into a whole to form a new connecting part with obviously increased height, so that a plurality of problems confronted during the connection of the traditional low-height pole are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically a terminal extension, a single battery assembly, and a single battery terminal. Background Technology

[0002] In the field of batteries, the terminals are key components that connect the battery to the external circuit. Their performance and structural design have a crucial impact on the overall performance and safety of the battery.

[0003] In practical applications, the height of traditional battery terminals is generally too low. This inherent structural defect causes many inconveniences in the connection and fixing of battery modules. For example, when building battery modules, terminals that are too low make it difficult to achieve a firm and efficient connection with other components, which greatly reduces the stability and reliability of the entire battery system. Under long-term use or complex operating conditions, loose connections are prone to occur, affecting power transmission efficiency and even causing faults such as open circuits. Summary of the Invention

[0004] The purpose of this invention is to provide a terminal extension, a single-cell battery assembly, and a single-cell battery terminal, overcoming the connection difficulties and other problems existing in traditional low-height terminals.

[0005] The first aspect of this utility model provides a pole extension member, including a pole extension member body, on which mounting holes are formed; the mounting holes are used for inserting a portion of the pole structure to achieve connection between the pole extension member body and the pole, and the top of the pole extension member body is higher than the top of the pole.

[0006] This invention utilizes mounting holes on the electrode extension body. During assembly, simply inserting the electrode into these holes quickly completes the initial positioning, eliminating the need for complex installation processes and specialized tools. This significantly improves production efficiency and lays a solid foundation for large-scale production. After insertion, reliable fixing methods such as interference fit, welding, and threaded connection can be selected according to actual needs to firmly integrate the electrode and the extension body, forming a new, significantly taller connecting component. This effectively solves many problems encountered when connecting traditional low-height electrodes.

[0007] Furthermore, the aforementioned mounting holes are stepped through holes, with the inner diameter of the large-diameter section being larger than the outer diameter of the pole post, forming a welding cavity; the inner diameter of the small-diameter section matches the outer diameter of the pole post, used for inserting part of the pole post structure, and the bottom of the large-diameter section is flush with the top end face of the pole post.

[0008] The bottom of the aforementioned large-diameter section serves as the welding surface, used for welding to the top end face of the pole post.

[0009] This method exhibits numerous significant advantages during end-face welding. From a welding process implementation perspective, the spacious and regular welding cavity facilitates the insertion of welding equipment and offers high operability. Regarding improved connection stability, end-face welding achieved through stepped through-holes creates a large-area continuous weld, significantly enhancing the axial connection strength between the terminal and the extension. In daily battery operation, facing complex conditions such as vibration and impact, this high-strength connection method ensures a stable and reliable connection between the terminal and the extension, strongly supporting the long-term reliable operation of the battery.

[0010] Furthermore, the aforementioned pole extension body is provided with a heat transfer tube mounting structure for mounting heat transfer tubes to realize heat exchange of the pole extension.

[0011] Traditional low-height battery terminals are limited by space, making it difficult to install heat transfer pipes. This results in heat generated during battery charging and discharging not being dissipated in time, severely impacting battery performance and lifespan. The terminal extension of this invention effectively increases the terminal height, making it possible to directly install heat transfer pipes on the extension. This improvement significantly enhances battery thermal management efficiency, promptly dissipating heat and effectively preventing overheating. This significantly slows down battery aging, extends battery life, and greatly reduces the risk of thermal runaway, ensuring equipment and personnel safety and providing strong support for stable battery operation under various complex conditions.

[0012] Furthermore, the aforementioned heat transfer tube mounting structure is a through groove formed on the body of the pole extension member, and the inner cavity of the through groove is used to install the heat transfer tube; the length axis of the through groove is perpendicular to the axis of the mounting hole, and the mounting hole perpendicularly penetrates the bottom of the through groove.

[0013] A through-slot is formed in the electrode extension to fix the heat transfer tube, ensuring good thermal contact between the heat transfer tube and the electrode extension. When heat is conducted to the electrode extension, it is further transferred to the heat transfer tube. The heat rapidly diffuses within the heat transfer tube and is dissipated through heat exchange with the surrounding environment, thus achieving heat dissipation for the battery.

[0014] Furthermore, the sidewall of the aforementioned through-slot is provided with a welding portion, which is used for welding and fixing to the heat transfer tube. The welding connection between the electrode extension and the heat transfer tube enables a tight bond between them. Compared to other connection methods, such as simple mechanical fixing, welding eliminates the tiny gaps between the connection points, greatly reducing thermal resistance, improving the heat conduction efficiency between the two, and ensuring effective heat transfer. The welding connection also enhances the stability of the connection, preventing the heat transfer tube from separating from the electrode extension due to vibration or other factors during battery operation, thus affecting the heat dissipation effect.

[0015] Furthermore, after the through slot is opened, the above-mentioned mounting hole can be a stepped through hole or a through straight hole;

[0016] If it is a through hole, it is used for inserting part of the pole post structure, and the opening of the through hole is flush with the top end face of the pole post; the annular plane around the mounting hole on the bottom of the above-mentioned through groove serves as a welding surface for welding connection with the top end face of the pole post.

[0017] Designating the annular plane surrounding the mounting hole at the bottom of the through-slot as the welding surface and welding it to the top face of the electrode post significantly improves the connection strength. The large continuous welding area of ​​the annular plane results in a stronger and more uniform weld compared to traditional spot welding, effectively resisting external forces and preventing loosening or detachment of the electrode post and its extension. This ensures stable electrical connections and efficient power transmission. However, when the weld flatness is low, gaps may form between the heat transfer tube and the bottom of the through-slot of the electrode post extension, affecting their thermal contact and negatively impacting battery heat dissipation efficiency.

[0018] If the mounting hole is a stepped through hole, the inner diameter of the large-diameter section is larger than the outer diameter of the pole post, forming a welding cavity; the inner diameter of the small-diameter section matches the outer diameter of the pole post, which is used for pole post insertion, and the opening of the through hole is flush with the top end face of the pole post.

[0019] The bottom of the large-diameter section is used as the welding surface, and the depth of the large-diameter section is greater than or equal to the weld height.

[0020] After the heat transfer tube is installed in the through groove of the electrode extension body, the depth of the large-diameter section is not less than the weld height, which can effectively separate the heat transfer tube from the weld. This means that even if the weld flatness is not perfect, it will not affect the contact between the heat transfer tube and the bottom of the through groove. In this way, heat can be smoothly conducted from the electrode and electrode extension to the heat transfer tube, maintaining heat dissipation efficiency, avoiding battery overheating, ensuring performance, and extending service life.

[0021] The second aspect of this utility model provides a single-cell battery assembly, including a single-cell battery and the aforementioned terminal extension member; the single-cell battery terminal is inserted into the mounting hole of the terminal extension member and fixedly connected to the terminal extension member, and the top of the terminal extension member body is higher than the top of the terminal; a safe electrical conduction distance is maintained between the bottom surface of the terminal extension member and the top cover plate of the single-cell battery.

[0022] The bottom surface of the terminal extension piece maintains a safe electrical conductivity distance from the top cover of the individual battery, effectively preventing electrical short circuits caused by accidental contact.

[0023] Furthermore, the aforementioned single-cell battery terminal post is provided with an annular step structure along its circumference. The small-diameter section of the terminal post is inserted into the mounting hole of the terminal post extension. The step surface serves as a limiting surface to support the terminal post extension. This ensures that a safe electrical conductivity distance is maintained between the bottom surface of the terminal post extension and the top cover plate of the single-cell battery.

[0024] The annular stepped structure on the individual battery terminal post uses the stepped surface as a limiting surface to support the terminal post extension, accurately determining the distance between the terminal post extension and the top cover of the individual battery. Whether during production or after long-term battery use, as long as the structure of the terminal post and terminal post extension remains intact, a stable electrical conductivity safety distance can be maintained, effectively preventing the risk of electrical short circuits and providing reliable assurance for safe battery operation.

[0025] Furthermore, a conductive coating is provided between the outer wall of the aforementioned terminal post and the mounting hole of the terminal post extension. The conductive coating has good conductivity and can fill the tiny gaps and unevenness between the terminal post and the mounting hole, allowing current to pass through the contact interface more smoothly, reducing resistance loss, improving the charging and discharging efficiency of the battery, and enhancing the energy utilization rate of the battery system.

[0026] The third aspect of this utility model provides a single-cell battery terminal post, including a terminal post body, with an annular stepped structure along its circumference. The small-diameter section of the terminal post is used to insert into the mounting hole of the terminal post extension member, and the stepped surface serves as a limiting surface to support the terminal post extension member.

[0027] Furthermore, the height of the aforementioned small diameter section is 2mm, the outer circumference of the small diameter section is C, and the effective welding height between the aforementioned small diameter section and the pole extension is h, where h equals 1.5mm.

[0028] The annular welding surface area S of the small diameter section and the pole extension is S = C * h; the above S must ensure that the welding area does not overheat or melt under the rated operating current.

[0029] The beneficial effects of this utility model are:

[0030] This invention utilizes mounting holes with an inner diameter larger than the outer diameter of the pole on the extension body. In actual assembly, simply inserting the pole into the mounting hole quickly completes the initial positioning, eliminating the need for complex installation processes and specialized tools. This significantly improves production efficiency and lays a solid foundation for large-scale production. After insertion, reliable fixing methods such as welding or threaded connection can be selected according to actual needs to firmly integrate the pole and extension, forming a new, significantly taller connecting component. This effectively solves many problems faced by traditional low-height poles during connection. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the pole extension component in Example 1;

[0032] Figure 2 This is a cross-sectional view of the pole extension component of Example 1;

[0033] Figure 3This is a schematic diagram of the structure of a single battery module in Example 1;

[0034] Figure 4 This is an exploded structural diagram of a single battery module in Example 1;

[0035] Figure 5 This is a cross-sectional view of a single battery module from Example 1;

[0036] Figure 6 This is a schematic diagram of the structure of a single cell in Example 1;

[0037] Figure 7 This is a schematic diagram of the pole extension component in Example 2;

[0038] Figure 8 This is a cross-sectional view of the pole extension component in Example 2;

[0039] Figure 9 This is a schematic diagram of the structure of a single battery module in Example 2;

[0040] Figure 10 This is a schematic diagram of the exploded structure of a single battery module in Example 2;

[0041] Figure 11 This is a cross-sectional view of a single-cell battery assembly from Example 2;

[0042] Figure 12 This is a schematic diagram of the battery component in Example 2;

[0043] Figure 13 This is a schematic diagram of the exploded structure of the battery component in Example 2;

[0044] Figure 14 This is a cross-sectional view of the battery component in Example 2;

[0045] Figure 15 This is a schematic diagram of the pole extension component in Example 3;

[0046] Figure 16 This is a cross-sectional view of the pole extension component in Example 3;

[0047] Figure 17 This is a cross-sectional view of a single-cell battery assembly in Example 3;

[0048] Figure 18 This is a schematic diagram of the battery component in Example 4;

[0049] Figure 19 This is a schematic diagram of the exploded structure of the battery component in Example 4;

[0050] Figure 20 This is a cross-sectional view of the battery component without heat transfer tubes in Example 4;

[0051] Figure 21 This is a cross-sectional view of the battery component with the heat transfer tube installed in Example 4.

[0052] The attached figures are labeled as follows:

[0053] 1. Terminal extension body; 11. Mounting hole; 111. Large diameter section; 112. Small diameter section; 113. Bottom of the large diameter section; 12. Through groove; 2. Single cell; 21. Terminal; 211. Annular stepped structure; 22. Single cell cover plate; 3. Heat transfer pipe; 4. Outer shell; 41. Clearance hole; 5. Electrolyte sharing chamber; 6. Gas sharing chamber; 7. Battery module. Detailed Implementation

[0054] To make the above-mentioned objectives, 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. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0055] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0056] In the description of this utility model, it should be noted that the terms "top" and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] This utility model discloses a terminal extension component and a single-cell battery assembly having such a terminal extension component. The terminal extension component is mainly used to extend the terminal of a single-cell battery. Mounting holes are opened on the terminal extension component for the terminal to be inserted. After the terminal is inserted, reliable fixing methods such as interference fit, welding, and threaded connection can be selected according to actual needs to firmly combine the terminal and the terminal extension component into one, forming a new connection component (defined as a polarity terminal) with a significantly increased height, effectively solving many problems faced by traditional low-height terminals when connecting.

[0058] This utility model also discloses a battery component assembled from the above-mentioned single battery modules. Such a battery component includes a battery module, which is mainly composed of multiple single battery modules arranged along the first direction. By connecting the electrical connectors to the polar terminals, it is possible to more conveniently realize the electrical connection between multiple single battery modules. At the same time, it can also realize a firm and efficient connection with other components, which greatly improves the stability and reliability of the entire battery component.

[0059] It should be noted that:

[0060] The aforementioned battery modules can include at least the following three types:

[0061] Type 1 battery module:

[0062] The first type of battery module includes multiple individual battery components arranged along a first direction;

[0063] For ease of description, in this utility model, the arrangement direction of the individual battery modules is defined as the x-direction; the height direction of the individual battery modules is defined as the z-direction; and the direction perpendicular to both the x and z directions is defined as the y-direction.

[0064] Second type of battery module:

[0065] The second type of battery module adds at least one electrolyte sharing pipeline to the first type of battery module. Based on the electrolyte sharing pipeline, the electrolyte areas inside the cavities of multiple individual battery modules are connected to achieve electrolyte sharing, reduce the differences between individual battery modules, and optimize the cycle performance of the battery module. It may also include a gas sharing pipeline, which connects the gas areas inside the cavities of multiple individual battery modules to achieve gas balance and further optimize the cycle performance of the battery module.

[0066] Third type of battery module:

[0067] The third type of battery module, based on the first type of battery module, adds a shell, with multiple individual battery components arranged along the x-direction and placed inside the shell cavity.

[0068] This utility model does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0069] The first structure includes a cylindrical body with open ends (i.e., the port parallel to the yz plane is the open end) and end plates fixed to the two open ends of the cylindrical body (i.e., the end plates are parallel to the yz plane).

[0070] The second structure includes a cylindrical body with open ends at the top and bottom (i.e., the port parallel to the xy plane is the open end) and a top plate and a bottom plate fixed to the open ends at the top and bottom of the cylindrical body respectively (i.e., the top plate and the bottom plate are both parallel to the xy plane, and the bottom plate or the top plate can be an integral structure with the cylindrical body).

[0071] A shared chamber can be provided inside the aforementioned casing to enable communication between the internal cavities of each individual battery module.

[0072] It should be noted that:

[0073] The aforementioned shared chamber can be an electrolyte shared chamber, whose inner cavity is connected to the inner cavity of each individual battery module. This shared chamber ensures that each individual battery module is in a uniform electrolyte environment, guaranteeing the homogeneity of the electrolyte within each module and improving the performance and charge-discharge cycle life of the battery module. The electrolyte shared chamber described here is a liquid channel extending along the length (x-direction) of the casing between the bottom plate of the outer casing and each individual battery module. This liquid channel can be integrally formed with the bottom plate of the outer casing, or it can be formed by setting a support between the lower cover plate of the individual battery module and the bottom plate of the outer casing. It should be noted that in the first type of casing structure, the bottom plate here is a cylindrical bottom plate; in the second type of casing structure, the bottom plate here is a base plate.

[0074] The aforementioned shared chamber can also be a gas-sharing chamber located on the top plate of the outer casing, covering the gas ports on the top of each individual battery module in the battery module.

[0075] It should be noted that in the first type of shell structure, the top plate of the shell here is the top plate of the cylinder; in the second type of shell structure, the top plate of the shell here is the top plate.

[0076] It should also be noted that the gas port here has the following two meanings:

[0077] 1) The gas port is a through hole that is directly opened on the top cover of the single cell module and penetrates the inner cavity of the single cell module;

[0078] At this time, the gas-sharing chamber is connected to the gas area of ​​each individual battery module through the gas port. Based on the gas-sharing chamber, the gas areas of each individual battery module can be connected to achieve gas balance, so that the gas of each individual battery module is shared to ensure the consistency of each individual battery module and improve the cycle life of the battery module to a certain extent. When any individual battery module experiences thermal runaway, the flue gas in the inner cavity of that individual battery module enters the gas-sharing chamber and is discharged through the gas-sharing chamber, thereby improving the safety of the battery module.

[0079] 2) The gas port is a vent or explosion-proof port installed on the cover plate of the single battery module, and a venting membrane is provided at the vent or explosion-proof port.

[0080] At this time, the gas sharing chamber is used as a venting channel. When the venting membrane at the gas port of any single battery module is ruptured by the flue gas in the inner cavity, the inner cavity of that single battery module and the gas sharing chamber are connected, and the flue gas inside is discharged through the gas sharing chamber, thereby improving the safety of the battery module.

[0081] The aforementioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each individual battery module can be placed in a unified electrolyte environment and gas environment, thereby improving the performance of the battery module and its charge-discharge cycle life.

[0082] A clearance hole is made on the top plate of the outer casing corresponding to the terminal extension of each individual battery module; each terminal extension extends out of the corresponding clearance hole, and the area of ​​the top plate of the outer casing corresponding to the clearance hole is fixedly sealed to the outer casing of the individual battery module, so that the clearance hole part of the top plate of the outer casing is sealed.

[0083] It should be noted that:

[0084] The area on the top plate of the outer casing corresponding to the clearance hole can be the area around the clearance hole on the top plate of the outer casing, or it can be the wall of the clearance hole.

[0085] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0086] Example 1

[0087] like Figure 1 and Figure 2 The figures shown are a schematic diagram and a cross-sectional view of the pole extension component in this embodiment. The pole extension component includes a pole extension component body 1, which is usually designed as a rectangular block structure. Its length, width and height can be customized according to the actual application scenario to adapt to different battery specifications.

[0088] In some other embodiments, the pole extension body 1 may also be a cylinder.

[0089] Metal materials with good electrical and thermal conductivity can be used, such as silver, copper, and aluminum. However, considering both cost and electrical and thermal conductivity, aluminum is generally chosen as the material for the pole extension.

[0090] It should be noted that the volume of the electrode extension body 1 should not be too large, so as to avoid the battery component volume increasing and the energy density decreasing because the electrode extension body 1 affects the distance between adjacent single cells 2.

[0091] from Figure 1 and Figure 2 As can be seen from the figure, in this embodiment, a mounting hole 11 is opened on the electrode extension body 1 for inserting part of the structure of the electrode 21 of the single cell 2, thereby realizing the effective connection between the two.

[0092] like Figures 3 to 5 The figures shown are a schematic diagram, an exploded view, and a cross-sectional view of the single-cell battery assembly in this embodiment. It can be seen that the single-cell battery assembly in this embodiment includes a single-cell battery 2 and the aforementioned terminal extension member. In this embodiment, the single-cell battery 2 is a square-shell battery, and a terminal extension member is installed on each terminal 21.

[0093] In some other embodiments, the single cell 2 may also be a cylindrical cell with an extension piece mounted on its terminal post 21.

[0094] During installation, insert the terminal post 21 into the mounting hole 11 of the terminal post extension and fix it to the terminal post extension. It is worth noting that after installation, a safe electrical conduction distance must be maintained between the bottom surface of the terminal post extension and the top cover plate 22 of the single cell. This is crucial and relates to the safe and stable operation of the entire battery.

[0095] There are three main types of connection methods to choose from:

[0096] Interference fit connection: The diameter of the mounting hole 11 is adapted to the outer diameter of the terminal 21 of the single battery cell. When the terminal 21 is inserted into the mounting hole 11, the two are tightly connected by an interference fit. This connection method requires a certain external force to press the terminal 21 into the mounting hole 11 during assembly, generating significant friction between the terminal 21 and the mounting hole 11. No additional fixing measures are needed to ensure a stable connection and effectively prevent loosening or displacement of the terminal extension during use. It should be noted that the mounting hole 11 can be a through hole or a non-through hole, and the choice can be made flexibly according to specific requirements in practical applications.

[0097] Threaded Connection: The diameter of the mounting hole 11 is slightly larger than the outer diameter of the terminal 21 of the single battery cell. A threaded structure is provided on the wall of the mounting hole 11 near the terminal 21 of the single battery cell. Correspondingly, a matching threaded structure needs to be provided on the terminal 21. After the terminal 21 is inserted into the mounting hole 11, the terminal 21 is tightly connected to the mounting hole 11 by rotating the terminal extension. The threaded connection is easy to operate and has good disassembly, making it easy to separate the terminal 21 from the terminal extension during subsequent maintenance or replacement of battery module components. At the same time, the position of the terminal 21 in the mounting hole 11 can be flexibly adjusted by controlling the screw depth. Similarly, it should be noted that the mounting hole 11 corresponding to the threaded connection can be either a through hole or a non-through hole, and can be flexibly selected according to specific needs in practical applications.

[0098] Welded connection:

[0099] Method 1: Mounting hole 11 is a stepped through-hole structure: such as Figures 1 to 5As shown, the mounting hole 11 is designed as a stepped through hole, including a large-diameter section 111 and a small-diameter section 112. The inner diameter of the large-diameter section 111 is significantly larger than the outer diameter of the pole post 21, thus forming a welding cavity. The inner diameter of the small-diameter section 112 matches the outer diameter of the pole post 21, providing fitting space for the insertion of part of the pole post 21 structure. During assembly, part of the pole post 21 structure is inserted into the small-diameter section 112, ensuring that the top end face of the pole post 21 is flush with the bottom 113 of the large-diameter section. The bottom 113 of the large-diameter section is then welded to the top end face of the pole post 21. Figure 5 (as shown in position a). It should be noted that, unlike the previous two connection methods, the mounting hole 11 corresponding to the welding connection must be designed as a through hole to meet the requirements of the welding process and the overall structure.

[0100] Method 2: Mounting hole 11 is a through hole structure: During assembly, the pole post 21 is inserted into the through hole, and the edge of the top end face of the pole post 21 is welded to the wall of the through hole.

[0101] Method 3: Mounting hole 11 is a blind hole structure: The bottom of the blind hole is connected to the pole post 21 by through welding (see Chinese Patent CN220797024U).

[0102] Compared to threaded connections and interference fit connections, welded connections form a permanent connection through interatomic bonding, resulting in higher connection strength. This allows the connection to better resist the influence of complex working conditions, ensuring a stable connection and effectively avoiding electrical connection instability caused by loosening.

[0103] Among the three welding connection methods, method one (stepped through hole structure) has a significant advantage over method three (blind hole structure).

[0104] The stepped through-hole structure creates a relatively regular welding cavity, allowing the welding material to fill and flow better. During welding, it can be evenly distributed between the top face of the pole post 21 and the bottom of the large-diameter section 111, significantly reducing welding defects and forming a high-quality weld. This enhances the connection strength between the pole post 21 and the pole post extension, enabling it to withstand greater external forces and effectively resisting them. It also prevents the pole post 21 and the pole post extension from loosening or detaching, ensuring a stable electrical connection. Furthermore, end-face welding only requires forming a weld at a defined interface, making the process controllable and the operation relatively simple.

[0105] When the mounting hole 11 is a blind hole, the process requirements are high during through welding, and welding defects such as incomplete penetration and porosity are prone to occur, which seriously affect the weld quality and thus weaken the connection strength between the pole post 21 and the pole post extension.

[0106] Method 1 (stepped through-hole structure) also has significant advantages over Method 2 (straight through-hole structure). The welded connection of the stepped through-hole structure has its welding area concentrated at the top face of the pole post 21 and the bottom of the large-diameter section 111, forming a large-area continuous weld. This concentrated welding area not only significantly enhances the axial connection strength but also facilitates precise control of the welding process, leading to more stable and high-quality welds, further improving the reliability and stability of the connection. In contrast, the straight through-hole structure, due to limited operating space, struggles to guarantee consistent weld quality.

[0107] Given that the stepped through-hole structure used in the above-mentioned welding connection exhibits excellent performance in terms of connection strength, resistance to complex working conditions, and ensuring electrical connection stability, this embodiment adopts the stepped through-hole structure welding connection method after comprehensive consideration.

[0108] In addition, to ensure a reliable electrical conductivity safety distance is maintained between the bottom surface of the terminal extension and the top cover plate 22 of the individual battery, at least the following two methods can be adopted in the design:

[0109] Insulating gasket and annular groove design: An insulating gasket is placed on the bottom surface of the terminal extension, and an annular groove is machined at the corresponding position on the top cover of the individual cell 2. The insulating gasket is embedded in the annular groove. The insulating gasket can effectively prevent abnormal current conduction, while the annular groove can position and protect the insulating gasket, ensuring that the insulating gasket is always in the correct position during the operation of the individual cell assembly.

[0110] 21-step pole structure design: combined with Figure 5 and Figure 6 As can be seen, an annular stepped structure 211 is provided on the circumference of the terminal post 21. When installing the terminal post extension, the small-diameter section of the terminal post 21 is inserted into the mounting hole 11 of the terminal post extension, and the stepped surface serves as a limiting surface to support the terminal post extension. By designing the size and position of the stepped structure of the terminal post 21, the height of the terminal post extension after installation can be controlled, thereby ensuring that a safe electrical conduction distance is always maintained between the bottom surface of the terminal post extension and the top cover plate 22 of the single cell. This effectively avoids various electrical safety problems caused by improper distance and provides a reliable guarantee for the safe and stable operation of the battery pack.

[0111] Since the stepped structure design of the pole post 21 does not require the introduction of an insulating pad, it is sufficient to design a stepped structure on the pole post 21. Therefore, the stepped structure design of the pole post 21 is preferred in this embodiment.

[0112] In specific design, when the height of the pole post 21 itself meets the requirement that the annular step structure 211 can be directly formed, the annular step structure 211 can be directly machined in the circumference of the pole post 21. When the height of the pole post 21 does not meet the conditions for direct forming, an equivalent annular step structure 211 can be formed by fixing a boss on the pole post 21.

[0113] Regarding dimensional parameters, in this embodiment, the overall height of the pole post 21 is 10mm, a significant improvement compared to the conventional pole post height of 2mm. This increase in height provides ample space for machining the annular stepped structure. The height of the minor diameter section is set to 3mm, increasing the mating depth between the minor diameter section and the mounting hole of the pole post extension, thus improving the connection stability between the two. In other embodiments, the height of the minor diameter section is set to 2mm, 4mm, etc.

[0114] Furthermore, the annular welding surface area S between the small-diameter section and the pole extension is S = C * h; where C is the outer circumference of the small-diameter section, and h is the effective welding height between the small-diameter section and the pole extension. In practical applications, the welding surface area S must meet specific requirements, namely, that the welding area will not overheat or melt under rated operating current. To achieve this goal, the outer circumference C of the small-diameter section and the effective welding height h between the small-diameter section and the pole extension can be optimized. Given that the height of the small-diameter section is limited to 3mm, this embodiment can limit h to 1.5mm, requiring only optimization of the outer circumference C of the small-diameter section to ensure good electrical conductivity and heat dissipation in the welding area.

[0115] Furthermore, in this embodiment, a conductive coating may be provided between the outer wall of the electrode post 21 and the mounting hole 11 of the electrode post extension. Metal coating materials (silver coating, copper coating, etc.), carbon-based coating materials (graphene coating, carbon nanotube coating, etc.), or conductive polymer coatings (polypyrrole coating, etc.) may be used.

[0116] The conductive coating possesses excellent conductivity, filling minute gaps and unevenness between the terminal post 21 and the mounting hole 11. This allows current to flow more smoothly through the contact interface, reducing resistance loss, improving battery charging and discharging efficiency, and enhancing the energy utilization of the battery system. Furthermore, the conductive coating effectively improves the electrical contact stability between the terminal post 21 and the terminal post extension. During battery operation, complex conditions such as vibration and temperature changes can alter the contact state between the terminal post 21 and the terminal post extension, affecting electrical connection stability. The conductive coating adheres tightly to the outer wall of the terminal post 21 and the inner wall of the mounting hole 11, maintaining good conductivity even under external forces. This ensures a consistently stable and reliable electrical connection, preventing current fluctuations and power outages caused by poor contact, thus providing strong support for the stable operation of the battery system. Additionally, during the installation of the terminal post extension, relative friction may occur between the terminal post 21 and the terminal post extension, leading to surface wear. The conductive coating has a certain degree of wear resistance, which can reduce this friction and wear to a certain extent, protect the surface integrity of the electrode post 21 and the electrode post extension, maintain good electrical connection and mechanical properties, and reduce the risk of failure due to wear.

[0117] In this embodiment, the height of the terminal post 21 is increased by using the terminal post extension. Based on this type of single-cell battery assembly, when constructing the battery component, the electrical connector is connected to the polarity terminal, which can more conveniently realize the electrical connection between multiple single-cell battery assemblies. At the same time, it can also realize a firm and efficient connection with other components, which greatly improves the stability and reliability of the entire battery component.

[0118] Example 2

[0119] This embodiment is another type of pole extension component. Based on embodiment 1, a heat transfer tube 3 mounting structure is provided on the pole extension component body 1 for mounting the heat transfer tube 3, and battery heat exchange is realized based on the heat transfer tube 3.

[0120] The specific structure is as follows: Figure 7 and Figure 8 As shown, in this embodiment, a through groove 12 is formed on the electrode extension body 1 as a mounting structure for the heat transfer tube 3. The through groove 12 extends through the electrode extension body 1 along a direction perpendicular to the axis of the mounting hole 11, and its inner cavity is used to install the heat transfer tube 3. The mounting hole 11 is located at the center of the bottom of the groove and extends perpendicularly through the bottom of the through groove 12.

[0121] The inner cavity shape of the through groove 12 is adapted to the cross-sectional shape of the heat transfer tube 3, ensuring that the heat transfer tube 3 is tightly clamped within it. This ensures installation stability while also guaranteeing the heat transfer effect between the heat transfer tube 3 and the pole extension. As can be seen from the figure, this embodiment uses a rectangular through groove 12, and the heat transfer tube 3 adapted to it should be a square tube.

[0122] In some other embodiments, an additional snap-fit ​​structure can be fixed to the electrode extension body 1 as a mounting structure for the heat transfer tube 3. However, compared to this embodiment, when installing the heat transfer tube 3, it is necessary to accurately align the snap-fit ​​structure and often require tools to snap the heat transfer tube 3 in. Slight carelessness during the process can lead to deformation of the snap-fit ​​structure or improper installation of the heat transfer tube 3. In this embodiment, the heat transfer tube 3 only needs to be placed directly along the through groove 12 to complete the initial positioning, significantly reducing the operational difficulty, greatly shortening the installation time, and significantly improving production efficiency. From the perspective of thermal contact effect, due to the limitations of the snap-fit ​​structure's snap-fit ​​shape and installation method, gaps easily exist between the heat transfer tube 3 and the electrode extension, making it impossible to guarantee a tight thermal contact. In contrast, the through groove 12 achieves a large-area surface contact between the heat transfer tube 3 and the electrode extension. For example, some clip-on mounting structures only fix the heat transfer tube 3 through a few contact points, limiting heat transfer to these small areas and resulting in high thermal resistance. The large contact area of ​​the through groove 12 allows heat to be quickly and evenly conducted from the electrode extension to the heat transfer tube 3, greatly improving the heat transfer rate and making the heat dissipation effect far superior to point and line contact structures, thus more effectively maintaining the appropriate operating temperature of the battery.

[0123] In order to improve the connection stability between the heat transfer tube 3 and the pole extension, this embodiment provides a welding part on the side wall of the through groove 12, and fixes it to the heat transfer tube 3 by welding the welding part.

[0124] Specifically, there are two feasible welding methods. First, a large area of ​​the sidewall of the through-slot 12 can be used as the welding point, and through-welded to the heat transfer tube 3 to form a strong connection, effectively enhancing the bonding strength and heat conduction performance of both. Second, the top of the sidewall of the through-slot 12 (a continuous plane extending along the first direction) can be used as the welding point. Welding can be performed along the contact area between the top of the sidewall of the through-slot 12 and the wall of the heat transfer tube 3, ensuring a uniform and continuous weld, thereby achieving a tight connection between the two.

[0125] Welding allows for a tight connection between the heat transfer tube 3 and the electrode extension. Compared to other connection methods, such as simple mechanical fixing, welding eliminates tiny gaps at the connection point, significantly reducing thermal resistance and greatly improving the heat transfer efficiency between the two, ensuring effective heat transfer. Simultaneously, welding enhances the connection stability, preventing the heat transfer tube 3 from separating from the electrode extension due to vibration, impact, or other factors during battery operation. This avoids affecting heat dissipation and ensures the continuous and stable operation of the battery component.

[0126] from Figure 7 and Figure 8 As can be seen, the mounting hole 11 in this embodiment is the same as that in Embodiment 1, and is also a stepped through hole. In the single-cell battery assembly, the specific connection method between the terminal extension and the terminal 21 is also the same as in Embodiment 1, see... Figures 9 to 11 During assembly, the pole post 21 is inserted into the small diameter section 112, ensuring that the top end face of the pole post 21 is flush with the bottom of the hole 113 of the large diameter section, and then the bottom of the hole 113 of the large diameter section is welded to the top end face of the pole post 21.

[0127] Similar to Embodiment 1, this embodiment also features an annular stepped structure 211 along the circumference of the terminal post 21. During the installation of the terminal post extension, the smaller diameter section of the terminal post 21 is inserted into the mounting hole 11 of the terminal post extension, with the stepped surface serving as a limiting surface to support the terminal post extension. By designing the dimensions and position of the stepped structure of the terminal post 21, the height of the terminal post extension after installation can be controlled, thereby ensuring a safe electrical conductivity distance is always maintained between the bottom surface of the terminal post extension and the top cover plate 22 of the individual battery cell. This effectively avoids various electrical safety problems caused by improper distance, providing a reliable guarantee for the safe and stable operation of the battery module.

[0128] Unlike Embodiment 1, in this embodiment, since the inner cavity of the through-slot 12 is used to install the heat transfer tube 3, if the bottom 113 of the large-diameter section is welded to the top end face of the pole post 21, the weld height will be high, exceeding the height of the welding cavity (i.e., exceeding the depth of the large-diameter section 111). This would cause the heat transfer tube 3 to directly contact the weld. This would not only interfere with the complete contact between the heat transfer tube 3 and the bottom of the through-slot 12, but also, because the material changes at the weld, it may create a region with high thermal resistance. Consequently, heat transfer would be difficult to achieve smoothly, and the heat transfer efficiency would decrease.

[0129] To overcome this problem, this embodiment limits the depth of the large-diameter section 111, requiring the depth of the large-diameter section 111 to be greater than the height of the weld, thereby separating the weld from the heat transfer pipe 3 and ensuring that the heat transfer pipe 3 is in complete contact with the bottom of the through groove 12. This ensures that heat can be conducted unimpeded along the electrode post 21 and the electrode post extension to the heat transfer pipe 3, maintaining efficient heat dissipation performance, effectively preventing the battery from overheating due to poor heat dissipation, ensuring that the battery maintains good performance under various operating conditions, and extending the battery's service life.

[0130] In this embodiment, the electrode extension serves a dual purpose. On one hand, it increases the height of the electrode 21, allowing the polarity terminals to be more easily and securely connected to other components during battery assembly, greatly improving the stability and reliability of the entire battery assembly. On the other hand, the heat transfer tube 3 can be fixed within the through groove 12 of the electrode extension. Based on this, efficient heat exchange can be achieved through the heat transfer tube 3 during battery assembly operation, effectively ensuring stable operation of the battery assembly at a suitable temperature.

[0131] The structure of the battery component in this embodiment is as follows: Figure 12 , Figure 13 and Figure 14 As shown, it includes a battery module 7 and a heat transfer pipe 3;

[0132] The battery module in this embodiment is the first type of battery module described above.

[0133] As shown in the figure, the battery module 7 in this embodiment includes 12 individual battery modules arranged along the x-direction. In other embodiments, the number of individual battery modules can be adjusted according to actual needs.

[0134] The heat transfer tube 3 is fixed along the x-direction within the through slot 12 of each pole extension located on the same side. From Figure 11 As can be seen from the image, two heat transfer pipes 3 are provided on the top of the battery module in this embodiment.

[0135] Preferably, a thermally conductive adhesive layer can also be provided between the through groove 12 and the heat transfer tube 3. The thermally conductive adhesive layer can be made of silicone thermally conductive adhesive, which is made of silicone polymer as the matrix and combined with a high thermal conductivity filler material; it can also be made of acrylic thermally conductive adhesive, which can form a stable thermally conductive adhesive layer in a short time.

[0136] The thermally conductive adhesive layer, positioned between the through-slot 12 and the heat transfer tube 3, adheres tightly to the outer wall of the heat transfer tube 3 and the inner wall of the through-slot 12, effectively fixing the heat transfer tube 3 in place. Its high viscosity allows it to form a strong adhesive force on the contact surface after being applied, effectively preventing the heat transfer tube 3 from shifting within the through-slot 12. This significantly improves the stability of the heat transfer tube 3 installation, preventing loosening of the connection due to tube movement and ensuring the heat dissipation and conductivity of the battery component. Furthermore, the adhesive layer significantly optimizes thermal conductivity. Unlike traditional direct solid-to-solid contact methods, the adhesive layer better adapts to different surface shapes and roughnesses. At the microscopic scale, even with minor unevenness between the outer wall of the heat transfer tube 3 and the inner wall of the through-slot 12, the adhesive layer can fill these gaps through its fluidity, forming an efficient heat conduction path. This effectively avoids hotspots caused by localized thermal resistance differences, further improving the heat dissipation efficiency of the battery component and ensuring its operation in a stable temperature environment.

[0137] Furthermore, the heat transfer tube 3 in this embodiment can be an electrical conductor, and the material can be a high-purity aluminum alloy, such as 6063 aluminum alloy. This material has good electrical conductivity, with a conductivity of 30-35 MS / m at 20°C, which can meet the requirements for current conduction; at the same time, it has excellent thermal conductivity, with a thermal conductivity of approximately 200-230 W / (m·K), which can efficiently achieve heat dissipation.

[0138] In this embodiment, the electrode extensions on the same side of the battery component have the same polarity, while the electrode extensions on different sides have opposite polarities. Two heat transfer pipes 3 are fixed on the electrode extensions on both sides respectively, realizing the parallel connection of multiple single cells 2.

[0139] Therefore, in this embodiment, the heat transfer pipe 3 not only serves as a heat dissipation component but also as an electrical conductor to realize the parallel connection of multiple individual battery cells 2, which has at least the following advantages:

[0140] Firstly, the elimination of the need for dedicated conductive connectors simplifies the overall structure of the battery component. In traditional battery modules, heat dissipation and conductivity are often handled by different components, requiring complex structural layouts and connection designs. In this embodiment, the heat transfer pipe 3 integrates both heat dissipation and conductivity functions, reducing the need for dedicated conductive connectors and making the overall structure of the battery component simpler and more compact, thus reducing design complexity and the probability of errors.

[0141] Secondly, since heat transfer pipe 3 simultaneously performs both heat dissipation and electrical conductivity functions, it reduces the number of components in the battery assembly, thereby lowering assembly difficulty and cost. Previously, separate heat dissipation pipes and conductive connectors not only resulted in a large number of components and increased procurement costs, but also required precise installation of each component during assembly, demanding high skill levels from assembly workers and leading to long assembly times.

[0142] Thirdly, the heat transfer tube 3, as a parallel connector, is directly embedded in the through groove 12 of the electrode extension, making full use of the space of the electrode extension and avoiding the problem of additional conductive connectors occupying space, which is conducive to improving the integration of battery components.

[0143] Fourthly, the heat transfer pipe 3, as a parallel connector, ensures a more uniform current distribution among the multiple individual batteries 2, preventing individual batteries from overheating and being damaged due to excessive current. The heat transfer pipe 3 is made of uniform material and has good conductivity; when used as a parallel connector, its resistance characteristics are consistent. According to electrical principles, current will be evenly distributed along paths with the same resistance. Therefore, after multiple individual batteries 2 are connected in parallel through the heat transfer pipe 3, the current can flow evenly to each individual battery 2, avoiding excessive current in individual batteries due to uneven current distribution, which could lead to overheating and damage. This effectively improves the overall performance and stability of the battery module 7.

[0144] In order to improve the connection stability between the heat transfer tube 3 and the electrode extension, and to ensure efficient heat conduction and uniform current transmission, the structure of the heat transfer tube 3 is optimized in this embodiment. A stepped structure is provided on the outer wall of the heat transfer tube 3 along its length. The horizontal surface of the stepped structure is flush with the top of the side wall of the through groove 12. The joint between the horizontal surface of the stepped structure and the top of the side wall of the through groove 12 is welded together.

[0145] It should be noted that the horizontal plane of the aforementioned stepped structure refers to the connection surface between the large-diameter and small-diameter sections of the heat transfer tube in the z-direction.

[0146] A stepped structure is provided on the outer wall of the heat transfer tube 3, and the horizontal plane of the stepped structure is flush with the top of the side wall of the through groove 12. At the same time, the joint is welded. This has at least the following advantages:

[0147] Improved stability: The stepped structure provides a larger welding contact area, making the welded connection more robust, reducing the risk of connection loosening due to vibration, and improving the overall stability of the battery components.

[0148] Optimize thermal conductivity and electrical conductivity: The horizontal plane of the stepped structure is flush with the top of the side wall of the through groove 12, ensuring a tighter contact between the heat transfer tube 3 and the pole extension, reducing the tiny gaps between the contact interfaces, significantly reducing thermal resistance, and improving thermal conductivity. At the same time, the tight contact between the two significantly reduces the contact resistance, allowing the current to be evenly distributed between the heat transfer tube 3 and the pole extension, avoiding local current concentration or hot spots caused by poor contact.

[0149] Furthermore, during the welding process, conventional welding operations may damage the structure of the heat transfer tube 3 due to factors such as high temperature and stress concentration, thus leading to potential leakage. The stepped structure design, with its horizontal plane flush with the top of the sidewall of the through-slot 12, provides an ideal operating plane for laser welding along the z-direction, effectively preventing leakage problems caused by damage to the heat transfer tube 3 structure during welding. When the heat transfer medium (such as coolant) flows inside the heat transfer tube 3, this design effectively prevents leakage of the heat transfer medium from the joint.

[0150] In some other embodiments, an electrolyte sharing pipeline can be provided at the bottom of the battery component. The inner cavity of the electrolyte sharing pipeline is connected to the electrolyte area of ​​each individual battery module, so as to realize electrolyte sharing, reduce the difference between individual battery modules, and optimize the cycle performance of the battery component.

[0151] Example 3

[0152] This embodiment is also a pole post extension component, but it differs from the pole post extension component in Embodiment 2 in that, as Figure 15 and Figure 16 In this embodiment, the mounting hole 11 on the electrode extension is a through hole. When assembling a single battery cell assembly, refer to... Figure 17 The pole post 21 is inserted into the mounting hole 11, ensuring that the top end face of the pole post 21 is flush with the opening of the mounting hole 11. The annular plane around the mounting hole 11 on the bottom of the through groove 12 is used as the welding surface and welded to the top end face of the pole post 21. The through groove 12 structure enables end face welding, resulting in a high connection strength between the pole post 21 and the pole post extension.

[0153] However, if the weld flatness is poor, with protrusions or depressions, the heat transfer tube installed in the through slot in the battery component will not be able to fit tightly with the heat transfer tube 3 and the electrode extension. Gaps will appear in some areas, obstructing the heat transfer path, which will still have an adverse effect on the contact between the heat transfer tube 3 and the electrode extension, resulting in a significant reduction in heat exchange efficiency.

[0154] Example 4

[0155] This embodiment presents another type of battery component. Its structure differs from the battery component in Embodiment 2 in that the battery module in this embodiment is the aforementioned third type of battery module, with the specific structure as follows: Figures 18 to 21As shown.

[0156] In this embodiment, the third type of battery module arranges 12 individual battery components in the inner cavity of the outer casing 4, and each electrode extension is located outside the outer casing 4. Heat transfer pipes 3 are fixed on the electrode extensions located on the same side.

[0157] A support extending in the x-direction is provided between the bottom plate of the outer casing 4 and each individual battery assembly to form a liquid channel, serving as a shared electrolyte chamber 5.

[0158] On the top plate of the outer casing 4, a boss extending in the x direction may also be provided, and a gas channel is opened on the boss, which serves as a gas sharing chamber 6.

[0159] This embodiment can achieve the assembly of battery components through the following process:

[0160] First, place 12 individual battery modules inside the housing 4, so that the terminals 21 of each individual battery 2 correspond one-to-one with the clearance holes 41.

[0161] After that, as Figure 20 , Figure 21 As shown, the top plate of the outer shell 4 corresponding to the clearance hole 41 is fixedly sealed to the outer shell of the single battery 2. An extension piece is fixed on each terminal post 21. Specifically, the terminal post 21 is inserted into the small diameter section 112 of the corresponding terminal post extension mounting hole 11, ensuring that the top end face of the terminal post 21 is flush with the bottom 113 of the large diameter section. The bottom 113 of the large diameter section is then welded to the top end face of the terminal post 21.

[0162] Finally, as Figure 21 As shown, the heat transfer tube 3 is fixed along the x-direction in the through groove 12 of each pole extension on the same side.

Claims

1. A pole post extension member, characterized in that: It includes a pole extension body with mounting holes; the mounting holes are used for inserting a part of the pole structure to connect the pole extension body to the pole, and the top of the pole extension body is higher than the top of the pole.

2. The pole extension member according to claim 1, characterized in that: The mounting hole is a stepped through hole. The inner diameter of the large-diameter section is larger than the outer diameter of the pole post, forming a welding cavity. The inner diameter of the small-diameter section matches the outer diameter of the pole post, which is used for the insertion of part of the pole post structure. The bottom of the large-diameter section is flush with the top end face of the pole post. The bottom of the large-diameter section serves as the welding surface for welding to the top end face of the pole post.

3. The pole extension member according to claim 1, characterized in that: The electrode extension body is provided with a heat transfer tube mounting structure for mounting heat transfer tubes to realize heat exchange of the electrode extension.

4. The pole extension member according to claim 3, characterized in that: The heat transfer tube mounting structure is a through groove opened on the body of the pole extension member, and the inner cavity of the through groove is used to install the heat transfer tube; the length axis of the through groove is perpendicular to the axis of the mounting hole, and the mounting hole perpendicularly penetrates the bottom of the through groove.

5. The pole extension member according to claim 4, characterized in that: The sidewall of the through groove is provided with a welding part, which is used to weld and fix it to the heat transfer tube.

6. The pole extension member according to claim 4, characterized in that: The mounting hole is a stepped through hole. The inner diameter of the large-diameter section is larger than the outer diameter of the pole post, forming a welding cavity. The inner diameter of the small-diameter section matches the outer diameter of the pole post, which is used for the insertion of part of the pole post structure. The bottom of the large-diameter section is flush with the top end face of the pole post. The bottom of the large-diameter section serves as the welding surface for welding to the top end face of the pole post, and the depth of the large-diameter section is greater than or equal to the weld height.

7. The pole extension member according to claim 4, characterized in that: The mounting hole is a through hole for inserting part of the pole post structure, and the opening of the through hole is flush with the top end face of the pole post; the annular plane around the mounting hole on the bottom of the through groove serves as a welding surface for welding connection with the top end face of the pole post.

8. A single-cell battery assembly, characterized in that: The device includes a single battery cell and a terminal extension member as described in any one of claims 1 to 7; the terminal cell terminal is inserted into the mounting hole of the terminal extension member and fixedly connected to the terminal extension member, and the top of the terminal extension member body is higher than the top of the terminal cell terminal; a safe electrical conductivity distance is maintained between the bottom surface of the terminal extension member and the top cover plate of the single battery cell.

9. The single-cell battery assembly according to claim 8, characterized in that: The single battery terminal post has an annular stepped structure along its circumference. The small diameter section of the terminal post is inserted into the mounting hole of the terminal post extension. The stepped surface serves as a limiting surface to support the terminal post extension. This ensures that a safe electrical conductivity distance is maintained between the bottom surface of the terminal post extension and the top cover of the single battery.

10. The single-cell battery assembly according to claim 8, characterized in that: A conductive coating is provided between the outer wall of the pole and the mounting hole of the pole extension.

11. A single-cell battery terminal, characterized in that: It includes the pole body, which has an annular stepped structure along its circumference. The small diameter section of the pole is used to insert the pole extension into the mounting hole, and the stepped surface serves as a limiting surface to support the pole extension.

12. The single-cell battery terminal according to claim 11, characterized in that: The height of the small diameter section is 2mm, the outer circumference of the small diameter section is C, and the effective welding height between the small diameter section and the pole extension is h, where h equals 1.5mm. The annular welding surface area S of the small diameter section and the pole extension is S = C * h; S must ensure that the welding area does not overheat or melt under the rated operating current.

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