Pole extension piece and single battery assembly

Abstract

The utility model belongs to the field of batteries, and particularly relates to a pole extension piece and a single battery assembly. The problems that a traditional low-height pole is difficult to connect and the arrangement of a functional structure is limited are solved, an installation hole and two first through grooves are formed in a pole extension piece body, the two first through grooves are used for fixing a heat transfer pipe, and part of the pole extension piece body is arranged in an inner cavity of the heat transfer pipe. The single battery assembly comprises a single battery and a pole extension piece, and the pole is inserted into the mounting hole and is fixedly connected with the pole extension piece; and an electric conduction safety distance is kept between the bottom surface of the pole extension piece and the upper cover plate of the single battery. And 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 connection of the traditional low-height pole are effectively solved. After the heat transfer pipe is installed in the two first through grooves, part of the pole extension piece body is in direct contact with a heat transfer medium flowing in an inner cavity of the heat transfer pipe, and heat exchange of the pole extension piece is achieved.

Description

Technical Field

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

[0004] In addition, the height limitation of the terminals makes it extremely difficult to set up additional functional structures on the terminals. For example, due to space constraints, it is difficult to install heat transfer pipes directly on the terminals to achieve effective heat dissipation, which in turn affects the thermal management effect of the battery during charging and discharging, may cause the battery to overheat, reduce battery life, or even bring safety hazards. Summary of the Invention

[0005] To address the difficulties in connection and limitations in functional structure of traditional low-height terminals, this invention provides a terminal extension and a single-cell battery assembly.

[0006] The first aspect of this utility model provides a pole extension member, including a pole extension member body, wherein a mounting hole extending in a third direction is provided on the pole extension member body; the mounting hole is used for inserting a part of the pole structure to realize the 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.

[0007] The aforementioned pole extension body is provided with two first through slots, which are arranged along the second direction, and each first through slot penetrates the pole extension body along the first direction.

[0008] The portion of the pole extension body located between the two first through slots is defined as the first portion of the pole extension body.

[0009] Two first through slots are used to fix the heat transfer tube, and the first part of the pole extension body is placed in the inner cavity of the heat transfer tube; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0010] 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.

[0011] Meanwhile, this invention features two first through slots on the electrode extension member for installing heat transfer tubes. After the heat transfer tubes are installed into the two first through slots, the first part of the electrode extension member body is placed inside the heat transfer tube cavity, directly contacting the heat transfer medium flowing inside the heat transfer tube cavity. The heat transfer medium directly acts on the electrode extension member, realizing heat exchange in the electrode extension member. This design has a shorter heat exchange path, improves the utilization efficiency of the heat transfer medium, and enhances the battery heat exchange efficiency.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] Furthermore, the first part of the aforementioned pole extension body is provided with a functional structure for increasing the heat exchange area.

[0016] A larger heat exchange area means that more heat can be transferred under the same time and conditions. This is crucial for the stable operation of the battery module, effectively preventing performance degradation and shortened lifespan caused by overheating. At the same time, efficient heat exchange also results in a more uniform temperature distribution among the individual cells within the battery module, reducing inconsistencies in battery performance caused by temperature differences, further improving the stability and reliability of the entire battery module, and ensuring its efficient and stable operation under various working conditions.

[0017] Furthermore, the aforementioned functional structure includes at least one through hole in the first part of the pole extension body, the through hole penetrating the first part of the pole extension body along the first direction to allow the heat transfer medium to pass through.

[0018] When the heat transfer medium flows through the body of the pole extension, the through holes allow the heat transfer medium to more fully surround the body of the pole extension. Originally, it could only contact the surface of the pole extension body for heat exchange, but now it can achieve internal heat exchange through the through holes, which greatly improves the amount of heat transferred per unit time and accelerates the heat removal speed on the pole extension.

[0019] Furthermore, the aforementioned mounting hole extends through the first part of the pole extension body in a third direction and communicates with the through hole, allowing the heat transfer medium to simultaneously contact the top end face of the pole, resulting in better heat exchange performance.

[0020] Furthermore, a welding part is provided on the side wall of the first part of the first channel away from the first part of the pole extension body, and the welding part is used to weld and fix it to the heat transfer tube.

[0021] The electrode extension and heat transfer tube are welded together, which can achieve a tight connection between the electrode extension and heat transfer tube. Compared with other connection methods, such as simple mechanical fixation, welding eliminates the tiny gaps between the connection parts, greatly reduces thermal resistance, improves the heat conduction efficiency between the two, and ensures effective heat transfer. Welding connection can also enhance the connection stability between the two and prevent the heat transfer tube and electrode extension from separating due to vibration and other factors when the battery is working, thus affecting the heat dissipation effect.

[0022] Furthermore, the aforementioned pole extension also includes an electrical connection post, which is located at the bottom of the pole extension body and protrudes from the pole extension body; the aforementioned mounting hole passes through the electrical connection post.

[0023] The terminal extension with electrical connection post is more suitable for battery components with a housing, where the electrical connection post extends into the clearance hole on the top plate of the housing and connects to the terminal post of the individual battery located inside the housing.

[0024] 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; a safe electrical conductivity distance is maintained between the bottom surface of the terminal extension member and the top cover plate of the single-cell battery.

[0025] 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.

[0026] Furthermore, the aforementioned single-cell battery terminal post is provided with an annular stepped structure along its circumference. The small-diameter end of the terminal post is inserted into the mounting hole of the terminal post extension, and the stepped surface serves as a limiting surface to support the terminal post extension; ensuring that a safe electrical conduction distance is maintained between the bottom surface of the terminal post extension and the top cover plate of the single-cell battery.

[0027] 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.

[0028] 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.

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

[0030] 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.

[0031] Meanwhile, this utility model has a first through groove on the pole extension for installing a heat transfer tube.

[0032] This invention installs the heat transfer tube onto the electrode extension member, with the first part of the electrode extension member body placed inside the heat transfer tube cavity, directly contacting the heat transfer medium. This enables heat exchange within the electrode extension member, resulting in a shorter heat exchange path. The heat transfer medium acts directly on the electrode extension member, improving the utilization efficiency of the heat transfer medium and enhancing the battery's heat exchange efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the pole extension component in Example 1;

[0034] Figure 2 This is a cross-sectional view of the pole extension in Example 1;

[0035] Figure 3This is a schematic diagram of the pole extension component in other embodiments;

[0036] Figure 4 This is a schematic diagram of the structure of a single battery module in Example 1;

[0037] Figure 5 This is a schematic diagram of the exploded structure of a single battery module in Example 1;

[0038] Figure 6 This is a cross-sectional view of a single battery module in Example 1;

[0039] Figure 7 This is a schematic diagram of the structure of a single cell in Example 1;

[0040] Figure 8 This is a schematic diagram of the battery component in Example 1;

[0041] Figure 9 This is a schematic diagram of the exploded structure of the battery component in Example 1. Figure 1 ;

[0042] Figure 10 This is a cross-sectional view of the battery component in Example 1;

[0043] Figure 11 This is a schematic diagram of the heat transfer tube in Example 1;

[0044] Figure 12 This is a schematic diagram of the exploded structure of the battery component in Example 1. Figure 2 ;

[0045] Figure 13 This is a schematic diagram of the exploded structure of the battery component in Example 1. Figure 3 ;

[0046] Figure 14 This is a schematic diagram of the pole extension component in Example 3;

[0047] Figure 15 This is a cross-sectional view of the pole extension in Example 3;

[0048] Figure 16 This is a schematic diagram of the battery component in Example 3;

[0049] Figure 17 This is a schematic diagram of the exploded structure of the battery component in Example 3;

[0050] Figure 18 This is a cross-sectional view of the battery component without heat transfer tubes in Example 3;

[0051] Figure 19 This is a cross-sectional view of the battery component with the heat transfer tube installed in Example 3.

[0052] The attached figures are labeled as follows:

[0053] 1. Terminal extension body; 10. Mounting hole; 101. Large diameter section; 102. Small diameter section; 103. Bottom of the large diameter section; 11. First through groove; 12. First part of the terminal extension body; 13. Through hole; 14. Welding part; 15. Electrical connection post; 2. Single cell; 21. Terminal; 211. Annular stepped structure; 3. Heat transfer tube; 31. First clearance hole; 32. Stepped structure; 5. Battery module; 6. Sealing ring; 51. Outer shell; 52. Second clearance hole; 54. Insulating seal; 541. Flexible insulating sealing ring; 542. Pressure ring; 8. Electrolyte sharing chamber; 9. Gas sharing chamber. 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," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] This utility model discloses a terminal extension component, which is mainly used to extend the terminal of a single battery cell. The terminal extension component has a mounting hole for the terminal to be inserted. After the terminal is inserted, a reliable fixing method such as interference fit, welding, or 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] Simultaneously, two first through slots are formed on the pole extension for installing heat transfer tubes. The two first through slots penetrate the pole extension body in a first direction and are arranged along a second direction, wherein the first direction and the second direction are perpendicular.

[0059] For ease of description, in this utility model, the part of the pole extension body located between the two first through slots is defined as the first part of the pole extension body.

[0060] This utility model also provides a single-cell battery assembly having the above-mentioned terminal extension and a battery component having such a single-cell battery assembly.

[0061] The single-cell battery assembly includes a single cell and the aforementioned terminal extension members fixed to the terminals of the single cell.

[0062] The battery component includes a battery module (in which individual battery cells are arranged along a first direction) and a heat transfer pipe. The heat transfer pipe has an extension slot on its wall to allow for extension of the terminal post. The heat transfer pipe extends along the first direction, with its two sidewalls embedded into two first through slots on the same side of the extension of the terminal post of each individual battery cell in the battery module. The first part of the extension body of each terminal post extends into the inner cavity of the heat transfer pipe through the extension slot, with a certain gap between it and the inner wall of the heat transfer pipe. This gap serves as a flow sub-cavity for the heat transfer medium, allowing the heat transfer medium within the flow sub-cavity to directly act on the extension body, improving the utilization efficiency of the heat transfer medium and enhancing the heat exchange efficiency of the battery module. Furthermore, electrical connectors can be connected to polar terminals, enabling more convenient electrical connections between multiple individual battery cells. Simultaneously, it allows for robust and efficient connections with other components, significantly improving the stability and reliability of the entire battery component.

[0063] It should be noted that the above-mentioned battery modules can include at least the following three types:

[0064] Type 1 battery module:

[0065] The first type of battery module includes multiple individual battery components arranged along a first direction;

[0066] 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.

[0067] Second type of battery module:

[0068] 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 cells are connected to achieve electrolyte sharing, reduce the differences between individual cells, 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 cells to achieve gas balance and further optimize the cycle performance of the battery module.

[0069] Third type of battery module:

[0070] 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.

[0071] This utility model does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0072] 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).

[0073] 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).

[0074] A shared chamber can be provided inside the aforementioned casing, and the internal cavities of each individual battery cell can be connected based on the shared chamber.

[0075] It should be noted that:

[0076] The aforementioned shared chamber can be an electrolyte sharing chamber, with its inner cavity connected to the inner cavities of each individual battery cell. This shared chamber ensures that each individual battery cell is in a uniform electrolyte environment, guaranteeing electrolyte homogeneity and improving the battery module's performance and charge-discharge cycle life. The electrolyte sharing chamber described here is a liquid channel extending along the length of the casing between the casing's bottom plate and each individual battery cell. This liquid channel can be integrally formed with the casing's bottom plate or formed by a support structure between the individual battery's lower cover and the casing's bottom plate. It should be noted that in the first type of casing structure, the casing's bottom plate here is a cylindrical bottom plate; in the second type of casing structure, the casing's bottom plate here is a base plate.

[0077] 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 cell in the battery module.

[0078] 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.

[0079] It should also be noted that the gas port here has the following two meanings:

[0080] 1) The gas port is a through hole directly opened on the top cover of the single cell and penetrating the inner cavity of the single cell;

[0081] At this time, the gas-sharing chamber is connected to the gas area of ​​each individual cell through the gas port. Based on the gas-sharing chamber, the gas areas of each individual cell can be connected to achieve gas balance, so that the gas of each individual cell is shared to ensure the consistency of each individual cell and improve the cycle life of the battery module to a certain extent. When any individual cell experiences thermal runaway, the flue gas in the inner cavity of that individual cell enters the gas-sharing chamber and is discharged through the gas-sharing chamber, improving the safety of the battery module.

[0082] 2) The gas port is a vent or explosion-proof port installed on the top cover of the individual battery, and a vent membrane is provided at the vent or explosion-proof port.

[0083] 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 cell is ruptured by the flue gas in the inner cavity, the inner cavity of that single battery cell 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.

[0084] The aforementioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each individual battery cell 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.

[0085] A second 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 second clearance hole, and the area of ​​the top plate of the outer casing corresponding to the second clearance hole is fixedly sealed with the outer casing of the individual battery, so that the second clearance hole area is sealed.

[0086] It should be noted that:

[0087] The area on the top plate of the outer casing corresponding to the second clearance hole can be the area around the second clearance hole on the top plate of the outer casing, or it can be the wall of the second clearance hole.

[0088] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0089] Example 1

[0090] like Figure 1 and Figure 2The 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.

[0091] In some other embodiments, the pole extension body 1 may also be a cylinder.

[0092] 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.

[0093] 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.

[0094] from Figure 1 and Figure 2 As can be seen from the figure, in this embodiment, two parallel first through slots 11 are opened on the pole extension body 1. The first through slots 11 penetrate the pole extension body 1 in the x direction, and the two first through slots 11 are arranged at intervals in the y direction.

[0095] The shape of the cross-section of the first channel 11 mainly conforms to the shape of the heat transfer tube 3 embedded in the wall of the first channel 11. It should be noted that the cross-section mentioned here is the cross-section obtained by cutting the first channel 11 along a plane perpendicular to the first direction. For example, as can be seen from the figure, the cross-section of the first channel 11 in this embodiment is rectangular, and correspondingly, the cross-section of the heat transfer tube 3 embedded in the wall of the first channel 11 is also rectangular, for example, it can be a rectangular tube. In some other embodiments, the cross-section of the first channel 11 can be arc-shaped, and correspondingly, the cross-section of the heat transfer tube 3 embedded in the wall of the first channel 11 is also arc-shaped, for example, a tube with a semi-circular cross-section can be used.

[0096] The width of the first through groove 11 (in the y direction) needs to ensure that the wall of the corresponding heat transfer tube 3 can be embedded, and there is a certain gap between the inner wall of the heat transfer tube 3 and the first part 12 of the pole extension body to allow the heat transfer medium to flow.

[0097] To improve the connection stability between the heat transfer tube 3 and the pole extension member, this embodiment provides a welding part 14 on the side wall of the first through groove 11, which is then welded and fixed to the heat transfer tube 3. Here, the side wall of the first through groove 11 is the side wall of the first through groove 11 away from the first part 12 of the pole extension member body.

[0098] Specifically, there are two feasible welding methods. First, a large area of ​​the sidewall of the first through-slot 11 can be used as the welding part 14, and through-welded to the heat transfer pipe 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 first through-slot 11 (a continuous plane extending along the first direction) can be used as the welding part 14. Welding can be performed along the contact area between the top of the sidewall of the first through-slot 11 and the wall of the heat transfer pipe 3, ensuring a uniform and continuous weld, thereby achieving a tight connection between the two.

[0099] 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.

[0100] from Figure 1 and Figure 2 As can be seen from the figure, in this embodiment, a mounting hole 10 extending in a third direction is opened on the first part 12 of the electrode extension body. The mounting hole 10 is isolated from the two first through slots 11 and is located between the two first through slots 11. It is used for the insertion of part of the structure of the electrode 21 of the single cell battery 2, thereby realizing the effective connection between the two.

[0101] In some other embodiments, the mounting hole 10 may also be located on one side of the two first through slots 11, such as... Figure 3 As shown.

[0102] like Figures 4 to 6 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.

[0103] In some other embodiments, the single cell 2 may also be a cylindrical cell with an extension piece mounted on its terminal post 21.

[0104] During installation, insert the terminal post 21 into the mounting hole 10 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 of the single cell 2. This is crucial and relates to the safe and stable operation of the entire battery.

[0105] There are three main types of connection methods to choose from:

[0106] Interference fit connection: The diameter of the mounting hole 10 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 10, the two are tightly connected by an interference fit. This connection method requires a certain amount of external force to press the terminal 21 into the mounting hole 10 during assembly, which generates significant friction between the terminal 21 and the mounting hole 10. 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 10 can be a through hole or a non-through hole, and the choice can be made flexibly according to specific requirements in practical applications.

[0107] Threaded Connection: The diameter of the mounting hole 10 is slightly larger than the outer diameter of the terminal 21 of the single battery cell 2. A threaded structure is provided on the wall of the mounting hole 10 near the terminal 21 of the single battery cell 2. Correspondingly, a matching threaded structure needs to be provided on the terminal 21. After the terminal 21 is inserted into the mounting hole 10, the terminal 21 and the mounting hole 10 are tightly connected 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 5 components. At the same time, the position of the terminal 21 in the mounting hole 10 can be flexibly adjusted by controlling the screw depth. Similarly, it should be noted that the mounting hole 10 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.

[0108] Welded connection:

[0109] Method 1: Mounting hole 10 is a stepped through-hole structure: such as Figures 1 to 6 As shown, the mounting hole 10 is designed as a stepped through hole, including a large-diameter section 101 and a small-diameter section 102. The inner diameter of the large-diameter section 101 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 102 matches the outer diameter of the pole post 21, providing fitting space for the insertion of part of the pole post 21. During assembly, part of the pole post 21 is inserted into the small-diameter section 102, ensuring that the top end face of the pole post 21 is flush with the bottom 103 of the large-diameter section. The bottom 103 of the large-diameter section is then welded to the top end face of the pole post 21. Figure 6 (as shown in position a). It should be noted that, unlike the previous two connection methods, the mounting hole 10 corresponding to the welding connection must be designed as a through hole to meet the requirements of the welding process and the overall structure.

[0110] Method 2: Mounting hole 10 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.

[0111] Method 3: The mounting hole 10 is a blind hole structure: the bottom of the blind hole is connected to the pole post 21 by through welding (see Chinese Patent CN 220797024 U).

[0112] 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.

[0113] Among the three welding connection methods, method one (stepped through hole structure) has a significant advantage over method three (blind hole structure).

[0114] 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 103 of the large-diameter section, 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.

[0115] When the mounting hole 10 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.

[0116] Method 1 (stepped through-hole structure) also has significant advantages over Method 2 (straight through-hole structure). In the stepped through-hole structure, the welding area is concentrated at the top face of the pole post 21 and the bottom 103 of the large-diameter section, 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 welding quality.

[0117] 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.

[0118] In addition, to ensure a reliable electrical conductivity safety distance is maintained between the bottom surface of the terminal extension and the top cover of the single cell 2, at least the following two methods can be adopted in the design:

[0119] 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.

[0120] 21-step pole structure design: combined with Figure 7 As can be seen, an annular stepped structure 211 is provided along the circumference of the terminal post 21. When installing the terminal post extension, the small-diameter end of the terminal post 21 is inserted into the mounting hole 10 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 annular stepped structure 211 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 of the single cell 2, effectively avoiding various electrical safety problems caused by improper distance, and providing a reliable guarantee for the safe and stable operation of the battery pack.

[0121] Since the design of the annular step structure 211 of the pole post 21 does not require the introduction of an insulating pad, it is sufficient to design the annular step structure 211 on the pole post 21. In this embodiment, the design of the annular step structure 211 of the pole post 21 is preferred.

[0122] 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.

[0123] Furthermore, in this embodiment, a conductive coating may be provided between the outer wall of the electrode post 21 and the mounting hole 10 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.

[0124] The conductive coating possesses excellent conductivity, filling minute gaps and unevenness between the terminal post 21 and the mounting hole 10. 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 10, 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.

[0125] like Figures 8 to 10 In this embodiment, the battery component includes a battery module 5 and two heat transfer pipes 3. The battery module 5 in this embodiment is the first type of battery module described above.

[0126] As shown in the figure, the battery module 5 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. The positive terminal extensions (the positive terminal extensions are fixed on the positive terminal 21) of the 12 individual battery modules are arranged on one side, forming the total positive terminal of the battery module 5; the negative terminal extensions (the negative terminal extensions are fixed on the negative terminal 21) of the 12 individual batteries are arranged on the other side, forming the total negative terminal of the battery module 5. In some other embodiments, the arrangement of the terminal extensions of the individual batteries 2 can be adjusted according to the overall capacity requirements of the battery module 5 to adjust the series and parallel connection of each individual battery 2.

[0127] Each heat transfer tube 3 extends along a first direction, and two heat transfer tubes 3 are arranged along a second direction, respectively embedded in the first through slot 11 of each pole extension located on different sides. In this embodiment, one heat transfer tube 3 is embedded in the first through slot 11 of the total positive terminal of the battery module 5, and the other heat transfer tube 3 is embedded in the first through slot 11 of the total negative terminal of the battery module 5.

[0128] When the heat transfer tube 3 is embedded in the first through groove 11, the first part 12 of the pole extension body of each pole extension extends into the inner cavity of the heat transfer tube 3 through the pole extension clearance opening opened on the tube wall of the heat transfer tube 3. At the same time, a certain gap is reserved between the first part 12 of the pole extension body and the inner wall of the heat transfer tube 3 as a sub-cavity for the flow of heat transfer medium; in order to prevent the heat transfer medium in the sub-cavity from overflowing, it is necessary to seal the pole extension and the pole extension clearance opening.

[0129] Sealing measures can be taken by using sealants that are resistant to high temperatures and corrosion and have good insulation properties, or by installing sealing rings or gaskets to ensure the stable flow of the heat transfer medium in the closed sub-cavity.

[0130] Specifically, appropriate sealing measures can be selected based on the structure of the clearance opening, so as to... Figure 11 As shown in the figure, taking the structure of the heat transfer tube 3 in this embodiment as an example, its clearance is 12 first clearance holes 31 opened on the tube wall of the heat transfer tube 3; the 12 first clearance holes 31 are arranged at intervals along the x direction, and the 12 first clearance holes 31 correspond one-to-one with each pole post extension member on the same side of the battery module 5.

[0131] Corresponding to the above-mentioned clearance structure, such as Figure 9 and Figure 10 In this embodiment, a sealing measure is adopted by installing a sealing ring 6.

[0132] The specific installation steps are as follows: (Combined with...) Figure 12 and Figure 13 First, a sealing ring 6 is fitted onto the first part 12 of the pole extension body of each pole extension component. Preferably, as shown in the figure... Figure 10As shown, in the x-direction, electrode extensions extend from both sides of the sealing ring 6. In the z-direction, the bottom of the sealing ring 6 is in close contact with the bottom of the first through groove 11, and the bottom of the extended electrode extensions is in close contact with the top cover of the single battery cell 2. This arrangement can stabilize the position of the sealing ring 6 and prevent the sealing ring 6 from shifting during installation, thus affecting the sealing effect. Next, pick up two heat transfer tubes 3, one corresponding to the positive terminal side of the battery module 5 and the other corresponding to the negative terminal side. Align the heat transfer tubes 3 with the corresponding sides of the first through groove 11 and insert them into the first through groove 11. During this process, it is necessary to ensure that the first part 12 of the electrode extension body with the sealing ring 6 on each electrode extension extends into the first clearance hole 31 on the heat transfer tube 3 one-to-one. During the insertion process, the movement should be smooth to prevent the heat transfer tube 3 from colliding with the electrode extension and damaging the sealing ring 6 or causing the sealing ring 6 to shift. After the heat transfer tube 3 is initially inserted into the first through groove 11, the heat transfer tube 3 and the side wall of the first through groove 11 are welded. As welding progresses, the heat transfer tube 3 gradually fuses with the sidewall of the first through groove 11. During this process, the pressure generated by welding exerts a uniform and continuous squeezing effect on the sealing ring 6 fitted on the first part 12 of the pole extension body. After being squeezed, the sealing ring 6 undergoes elastic deformation, tightly filling the tiny gap between the pole extension and the first clearance hole 31, thereby achieving an efficient and reliable seal and effectively preventing the heat transfer medium in the flow cavity from overflowing.

[0133] The aforementioned sealing ring 6 also offers several advantages in the battery module 5. Under complex operating conditions, especially in vibrating environments, the sealing ring 6 can absorb some of the stress generated by vibration, preventing damage to the sealing structure due to relative displacement between the terminal extension and the first clearance hole 31, thus ensuring stable sealing performance. From a structural stability perspective, when the battery module 5 vibrates or is subjected to external impacts, the sealing ring 6 acts as a buffer between the terminal extension and the heat transfer tube 3, dispersing and absorbing some stress, reducing the direct impact force of the terminal extension on the heat transfer tube 3, reducing the risk of material fatigue and damage to the heat transfer tube 3 due to localized stress concentration, improving its overall structural stability, and extending its service life. In terms of manufacturing, using the sealing ring 6 for sealing is simpler and easier than some complex sealing processes, such as applying special sealant. During manufacturing, simply fitting the sealing ring 6 onto the terminal extension and then welding the heat transfer tube 3 achieves a good sealing effect, which helps improve production efficiency, reduce manufacturing costs, and reduce quality problems caused by complex processes.

[0134] In some other embodiments, the clearance opening may also be an elongated clearance hole formed on the wall of the heat transfer tube 3. The elongated clearance hole extends along the first direction, and the first part 12 of the pole extension body of each pole extension extends into the inner cavity of the heat transfer tube 3 through the elongated clearance hole.

[0135] Corresponding to the aforementioned clearance structure, a sealing gasket can be used as a sealing measure. This type of sealing gasket has 12 third clearance holes arranged at intervals along the first direction; the 12 third clearance holes correspond one-to-one with each terminal post extension on the same side of the battery module 5.

[0136] During installation: First, lay the two sealing gaskets in the first through-groove 11 of the different side electrode extensions, ensuring that the first part 12 of the electrode extension body on each electrode extension protrudes through the third clearance hole on the corresponding sealing gasket. During installation, ensure that the bottom of the sealing gasket is tightly fitted to the bottom of the first through-groove 11 and the top cover of the individual battery 2. Next, pick up the two heat transfer tubes 3, one corresponding to the positive terminal side of the battery module 5 and the other to the negative terminal side. Align the heat transfer tubes 3 with the corresponding side of the first through-groove 11 and insert them into the first through-groove 11, ensuring that the first part 12 of the electrode extension body on each electrode extension extends into the elongated clearance hole on the heat transfer tube 3. After the heat transfer tubes 3 are initially inserted into the first through-groove 11, weld the heat transfer tubes 3 to the sidewall of the first through-groove 11. As welding progresses, the heat transfer tube 3 gradually fuses with the sidewall of the first through groove 11. During this process, the pressure generated by welding exerts a uniform and continuous squeezing effect on the sealing gasket fitted on the first part 12 of the pole extension body. After being squeezed, the sealing gasket undergoes elastic deformation, tightly filling the tiny gap between the pole extension and the first clearance hole 31, thus achieving an efficient and reliable seal and effectively preventing the heat transfer medium from overflowing from the flow cavity.

[0137] In this embodiment, for a heat transfer tube 3 on the same side, the heat transfer medium flows in from one end of the heat transfer tube 3, flows sequentially through the sub-cavities surrounding the first portion 12 of all the electrode extension bodies located within the inner cavity of the heat transfer tube 3, and flows out from the other end of the heat transfer tube 3. A portion of the battery electrode extension structure is directly placed inside the heat exchange channel. The electrode extension and the top end face of the electrode 21 are in direct contact with the heat transfer medium. In conventional heat exchange methods, heat needs to pass through multiple levels of transfer to achieve exchange. However, in this embodiment, the electrode extension is directly connected to the heat transfer medium, allowing the heat transfer medium to act directly on the electrode extension without energy loss in other intermediate stages, significantly improving the utilization efficiency of the heat transfer medium. This means that the same amount of heat transfer medium can play a greater role in heat transfer, greatly improving the efficiency of heat transfer. While improving the utilization efficiency of the heat transfer medium, the overall heat exchange efficiency of the battery module 5 is also greatly improved. The problem that might have caused battery performance degradation due to untimely heat exchange is solved by this efficient heat exchange design, thus ensuring that battery module 5 is always in good working condition, extending the service life of battery module 5 and improving its working stability.

[0138] In this embodiment, the heat transfer tube 3 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℃, which can meet the requirements for current conduction; at the same time, it has excellent thermal conductivity, with a thermal conductivity of about 200-230 W / (m·K), which can efficiently achieve heat dissipation.

[0139] 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.

[0140] 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:

[0141] 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.

[0142] 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.

[0143] Thirdly, the heat transfer tube 3, as a parallel connector, is directly embedded in the first through groove 11 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.

[0144] 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 5.

[0145] To improve the connection stability between heat transfer tube 3 and the electrode extension, and to ensure efficient heat conduction and uniform current transfer, this embodiment optimizes the structure of heat transfer tube 3, such as... Figure 10 As shown, a stepped structure 32 is provided on the outer wall of the heat transfer tube 3 along its length. The horizontal surface of the stepped structure 32 is flush with the top of the side wall of the first through groove 11. The stepped structure 32 is welded to the joint between the horizontal surface of the stepped structure 32 and the top of the side wall of the first through groove 11.

[0146] It should be noted that the horizontal plane of the aforementioned stepped structure 32 refers to the connection surface between the large-diameter section and the small-diameter section of the heat transfer tube 3 in the z-direction.

[0147] A stepped structure 32 is provided on the outer wall of the heat transfer tube 3, and the horizontal plane of the stepped structure 32 is flush with the top of the side wall of the first through groove 11. At the same time, the joint is welded together, which has at least the following advantages:

[0148] Improved stability: The stepped structure 32 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.

[0149] Optimize thermal conductivity and electrical conductivity: The horizontal plane of the stepped structure 32 is flush with the top of the side wall of the first through groove 11, ensuring a tighter contact between the heat transfer tube 3 and the electrode 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 electrode extension, avoiding local current concentration or hot spots caused by poor contact.

[0150] 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 32, however, has a horizontal plane flush with the top of the sidewall of the first through groove 11, providing an ideal operating plane for laser welding along the z-direction. This effectively avoids leakage problems caused by damage to the heat transfer tube 3 structure during the welding process. 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.

[0151] Example 2

[0152] Unlike the above embodiments, this embodiment adopts the second type of battery module, that is, an electrolyte sharing pipeline is set at the bottom of the battery module 5 in the above embodiments. The inner cavity of the electrolyte sharing pipeline is connected to the electrolyte area of ​​each individual battery cell 2, so as to realize electrolyte sharing, reduce the difference between each individual battery cell 2, and optimize the cycle performance of the battery component.

[0153] Example 3

[0154] To adapt to the aforementioned third type of battery module and facilitate the connection between the terminal extension and the terminal 21, this embodiment, based on embodiment 1, provides an electrical connection post 15 at the bottom of the terminal extension body 1, such as... Figures 14 to 15 As shown, the electrical connection post 15 is located at the bottom of the pole extension body 1 and protrudes from the pole extension body 1, and the mounting hole 10 passes through the electrical connection post 15. In this embodiment, the pole extension body 1 and the electrical connection post 15 are an integral structure.

[0155] In this embodiment, the electrical connection post 15 has a columnar structure. Its cross-sectional shape is not specifically limited. It can be a quadrangular prism as shown in the figure, or a cylindrical structure. It is mainly adapted to the shape of the second clearance hole 52 on the top plate of the outer shell 51 in the third type of battery module 5, so that it can be inserted into the second clearance hole 52 and connected to the pole post 21.

[0156] like Figures 16 to 19 The diagram below is a schematic diagram of the battery component in this embodiment. The difference between the battery component in embodiment 1 and the battery module 5 in this embodiment is the third type of battery module mentioned above.

[0157] In this embodiment, the third type of battery module arranges 12 individual battery components in the inner cavity of the outer casing 51, and each electrode extension is located outside the outer casing 51. Heat transfer pipes 3 are fixed on the electrode extensions located on the same side.

[0158] A support extending in the x-direction is provided between the base plate of the outer casing 51 and each individual battery assembly to form a liquid channel, serving as an electrolyte sharing chamber 8.

[0159] The top plate of the outer casing 51 may also be provided with a boss extending in the x direction, and a gas channel is opened on the boss, which serves as a gas sharing chamber 9.

[0160] This embodiment can achieve the assembly of battery components through the following process:

[0161] First, place 12 individual battery modules inside the housing 51, so that the terminals 21 of each individual battery 2 correspond one-to-one with the second clearance holes 52.

[0162] Then, the top plate of the outer casing 51 corresponding to the second clearance hole 52 is fixed and sealed to the outer casing of the single battery 2;

[0163] In this embodiment, a sealed connection is achieved by welding the edge of the second clearance hole 52 near the single cell 2 to the upper cover plate of the single cell 2. This prevents external environmental interference from the gap between the second clearance hole 52 and the terminal post 21 into the internal environment of the high-capacity battery. Besides the welding method used in this embodiment, in some other embodiments, laser welding can also be used to weld the area around each second clearance hole 52 on the top plate of the outer casing 51 to the area around the corresponding terminal post 21 on the upper cover plate of the single cell 2.

[0164] Furthermore, due to the small gap size between the terminal 21 of the individual battery 2 and the second clearance hole 52, the insulation between the terminal 21 of the individual battery 2 and the top plate of the casing 51 may be difficult to ensure. Additionally, if thermal runaway occurs, cracks may appear at the weld between the second clearance hole 52 and the top cover of the individual battery 2, causing thermal runaway fumes to leak from that location. Therefore, if… Figure 18 and Figure 19 As shown, in this embodiment, an insulating seal 54 is provided in the gap between each second clearance hole 52 and the pole post 21. This insulating seal 54 ensures insulation between the pole post 21 and the top plate of the outer casing 51. Furthermore, even if leakage occurs at the welding point, the insulating seal 54 acts as a second barrier to prevent leakage of thermal runaway fumes. It should be noted that... Figure 18 In order to make it easier to show the position of the second clearance hole 52, no insulating seal 54 is provided on one side of the second clearance hole 52.

[0165] Therefore, after fixing and sealing the top plate of the outer casing 51 corresponding to the second clearance hole 52 to the outer casing of the single battery 2, the insulating seal 54 is placed between each second clearance hole 52 and the terminal post 21. Then, the terminal post extension is pressed tightly against the insulating seal 54, and finally, the terminal post extension is welded to the terminal post 21 of the single battery 2. In order to ensure that the terminal post extension can provide a uniform pressing force to the insulating seal 54 and ensure the insulation and sealing performance of the insulating seal 54, in this embodiment, as follows... Figure 19 As shown, the insulating seal 54 includes a flexible insulating sealing ring 541 and a pressure ring 542. During assembly, the flexible insulating sealing ring 541 is first placed in the second clearance hole 52; then the pressure ring 542 is placed on the flexible insulating sealing ring 541. The flexible insulating sealing ring 541 has a flexible stepped structure, with the small-diameter section of the stepped structure extending into the second clearance hole 52 and contacting the upper cover plate of the single cell 2, and the large-diameter section of the stepped structure located outside the top plate of the outer casing 51 and contacting the top of the top plate of the outer casing 51. The pressure ring 542 is a metal part. In some other embodiments, the insulating seal 54 can also be an insulating sealing layer formed by a casting process at the gap between the second clearance hole 52 and the terminal post 21.

[0166] The specific operation of welding the terminal extension to the terminal 21 of the single cell 2 is to insert the terminal 21 into the small diameter section 102 of the corresponding terminal extension mounting hole 10, ensuring that the top end face of the terminal 21 is flush with the bottom 103 of the large diameter section, and then weld the bottom 103 of the large diameter section to the top end face of the terminal 21.

[0167] Finally, a sealing ring 6 is fitted onto the first part 12 of the electrode extension body of each electrode extension. Preferably, in the x-direction, the electrode extensions extend from both sides of the sealing ring 6, and in the z-direction, the bottom of the sealing ring 6 is in close contact with the bottom of the first through groove 11, and the bottom of the extended electrode extensions is in close contact with the top plate of the outer casing 51 or the pressure ring 542. This arrangement can stabilize the position of the sealing ring 6 and prevent the sealing ring 6 from shifting during installation, thus affecting the sealing effect. Next, pick up two heat transfer tubes 3, one corresponding to the positive terminal side of the battery module 5 and the other corresponding to the negative terminal side. Align the heat transfer tubes 3 with the corresponding side of the first through groove 11 and insert them into the first through groove 11. During this process, it is necessary to ensure that the first part 12 of the electrode extension body with the sealing ring 6 fitted on each electrode extension extends into the first clearance hole 31 on the heat transfer tube 3 one-to-one. During the insertion process, the action should be smooth to prevent the heat transfer tube 3 from colliding with the electrode extension and damaging the sealing ring 6 or causing the sealing ring 6 to shift. After the heat transfer tube 3 is initially embedded in the first through groove 11, welding is performed between the heat transfer tube 3 and the side wall of the first through groove 11. As welding progresses, the heat transfer tube 3 gradually fuses with the side wall of the first through groove 11. During this process, the pressure generated by welding exerts a uniform and continuous squeezing effect on the sealing ring 6 fitted on the first part 12 of the pole extension body. After being squeezed, the sealing ring 6 undergoes elastic deformation, tightly filling the tiny gap between the pole extension and the first clearance hole 31, thereby achieving an efficient and reliable seal and effectively preventing the heat transfer medium in the flow cavity from overflowing.

[0168] Example 4

[0169] To further improve the heat exchange performance of the above-mentioned pole extension, this embodiment, based on the pole extension of the above embodiment, provides a functional structure that increases the heat exchange area on the first part 12 of the pole extension body. Such functional structure may include dot-shaped pits and protrusions on the outer wall of the first part 12 of the pole extension body, and may also include annular grooves on the outer wall of the first part 12 of the pole extension body, and may also include through grooves and through holes 13 on the first part 12 of the pole extension body.

[0170] like Figure 1 , Figure 2 , Figure 14 and Figure 15As shown, in this embodiment, a through hole 13 is formed on the first part 12 of the pole extension body as a functional structure. The through hole 13 penetrates the first part 12 of the pole extension body along the first direction. In practical applications, the size and number of through holes 13 can be flexibly adjusted according to specific needs, provided that the conductivity of the pole extension is not affected. Setting the through hole 13 can increase the contact area between the pole extension body 1 and the heat transfer medium, thereby significantly improving the heat transfer efficiency. When the heat transfer medium flows through the pole extension body 1, it can more fully surround the pole extension body 1 through the through hole 13. Previously, the heat transfer medium could only exchange heat with the surface of the pole extension body 1 through contact. Now, internal heat exchange can be achieved through the through hole 13, which greatly increases the amount of heat transferred per unit time and accelerates the heat dissipation speed of the pole extension.

[0171] Furthermore, in the above embodiment, the mounting hole 10 is formed on the first part 12 of the pole extension body, located between the two first through slots 11.

[0172] In this embodiment, after a through hole 13 is opened on the first part 12 of the pole extension body, the through hole 13 is also connected to the mounting hole 10, and the cooling medium can directly contact the top end face of the pole 21, thereby more efficiently removing the heat generated by the pole 21 and further improving the heat dissipation effect.

[0173] and Figure 3 The structure shown has mounting holes 10 located on one side of the two first through slots 11, which makes it difficult for the cooling medium to directly contact the pole post 21, resulting in a poorer heat dissipation effect compared to this embodiment.

Claims

1. A pole post extension member, characterized in that: The device includes a pole extension body, on which mounting holes are formed extending in a third direction; the mounting holes are used for inserting a portion 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. The pole extension body has two first through slots, which are arranged along the second direction. Each first through slot passes through the pole extension body along the first direction. Both first through slots are isolated from the mounting holes. The portion of the pole extension body located between the two first through slots is defined as the first portion of the pole extension body. Two first through slots are used to fix the heat transfer tube, and the first part of the pole extension body is placed in the inner cavity of the heat transfer tube; wherein the first direction, the second direction and the third direction are perpendicular to each other.

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 or 2, characterized in that: The first part of the pole extension body is provided with a functional structure for increasing the heat exchange area.

4. The pole extension member according to claim 3, characterized in that: The functional structure is at least one through hole opened on the first part of the pole extension body, the through hole penetrating the first part of the pole extension body along the first direction, for the heat transfer medium to pass through.

5. The pole extension member according to claim 4, characterized in that: The mounting hole extends through the first part of the pole extension body in a third direction and communicates with the through hole.

6. The pole extension member according to claim 1, characterized in that: The first through groove has a welding part on the side wall away from the first part of the pole extension body, which is used to weld and fix it to the heat transfer tube.

7. The pole extension member according to claim 1, characterized in that: It also includes an electrical connection post; the electrical connection post is located at the bottom of the electrode extension body and protrudes from the electrode extension body; The mounting hole is through the electrical connection post.

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

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