A battery member

Abstract

The utility model belongs to the battery field, concretely is a kind of battery component. Mainly solve the sealing problem between pole and shell. Battery component, including shell, multiple single battery, insulating seal and pole extension piece;Shell is equipped with vent, single battery is arranged in shell, shell top plate is equipped with pole avoiding hole corresponding the pole of each single battery;The pole of each single battery is inserted into corresponding pole avoiding hole;Insulating seal is set between the gap of each single battery pole and pole avoiding hole;Pole extension piece is connected with pole one-to-one correspondence, and along pole height direction, to insulating seal, make insulating seal be compressed, seal the gap between pole and pole avoiding hole. The sealing between pole and shell is greatly improved, so that harmful flue gas can only be discharged from the predetermined vent when thermal runaway, to avoid leakage caused by sealing defects.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically a battery component. Background Technology

[0002] In lithium-ion batteries, the seal between the terminals and the casing is crucial. From the perspective of mitigating thermal runaway risks, when a lithium-ion battery experiences thermal runaway, the large amount of harmful fumes generated must be discharged through the vent along a predetermined path. If the seal is defective, the fumes are likely to leak from the gap between the terminals and the casing. This not only further damages the structural integrity of the battery itself, exacerbating the severity of thermal runaway, but also rapidly fills the surrounding environment with harmful fumes, posing a significant safety hazard to operators and surrounding facilities, and threatening life and property. Summary of the Invention

[0003] The purpose of this invention is to provide a battery component that mainly solves the sealing problem between the terminal and the casing.

[0004] The battery component of this utility model includes a shell, n individual batteries, 2n insulating sealing components, and 2n terminal extension components, where n is an integer greater than 1;

[0005] The casing is provided with an explosion vent, and n individual batteries are arranged inside the casing. The top plate of the casing has a terminal clearance hole corresponding to the terminal of each individual battery. The terminal of each individual battery extends into the corresponding terminal clearance hole.

[0006] 2n insulating seals are installed one by one in the gap between the terminal post and the terminal post clearance hole of each individual battery cell;

[0007] 2n pole extensions are connected one-to-one with the poles and pressure is applied to the insulating seal along the pole height direction, so that the insulating seal is compressed and the gap between the pole and the pole clearance hole is sealed.

[0008] This invention utilizes 2n insulating seals and applies pressure along the height of the electrode post using an extension member to compress them, effectively filling the gaps between the electrode posts and the clearance holes, forming a tight and stable sealing structure. This ensures that harmful gases can only escape through the designated vent in the event of thermal runaway, preventing leakage due to sealing defects, effectively protecting the battery structure's integrity, and significantly reducing the risk of thermal runaway hazard spread. Simultaneously, the electrode post adapter further compresses the insulating seals, preventing them from detaching and leaking thermal runaway gases during thermal runaway.

[0009] Furthermore, the aforementioned insulating seal includes a flexible insulating sealing ring; the aforementioned flexible insulating sealing ring has a flexible stepped structure, the small-diameter section of the stepped structure extends into the electrode post clearance hole and contacts the top cover plate of the single cell, the large-diameter section of the stepped structure is located outside the housing, the end face of the large-diameter section near the small-diameter section contacts the top plate of the housing, and the end face away from the small-diameter section contacts the aforementioned electrode post extension.

[0010] The stepped structure of the flexible insulating sealing ring fits snugly against the terminal clearance hole, the top cover of the individual battery, and the top plate of the casing on multiple sides. The smaller diameter section inserts into the terminal clearance hole and makes tight contact with the top cover of the individual battery, while the larger diameter section is located outside the casing, with its two end faces contacting the top plate of the casing and the terminal extension, respectively. Under the pressure of the terminal extension, the gaps are filled, ensuring reliable sealing even if the internal pressure of the battery fluctuates or is subjected to vibration, thus improving the battery's sealing performance.

[0011] In addition, the stepped structure allows the flexible insulating sealing ring to be subjected to more uniform force. The end face of the large-diameter section contacts the top plate of the housing and the pole extension, which disperses the pressure and prevents the sealing ring from deforming due to excessive local stress, ensuring the long-term reliability and stability of the sealing structure.

[0012] Furthermore, the aforementioned insulating seal also includes a pressure ring; the pressure ring is a metal part and is disposed between the large-diameter section of the flexible insulating seal ring and the pole extension.

[0013] The metal pressure ring possesses excellent rigidity and pressure resistance. Positioned between the large-diameter section of the flexible insulating sealing ring and the terminal extension, it transmits the pressure applied by the terminal extension more evenly and stably to the flexible insulating sealing ring. Compared to relying solely on the terminal extension to directly act on the sealing ring, the pressure ring avoids pressure concentration that could lead to excessive local deformation or damage to the sealing ring. It ensures that the sealing ring is fully compressed throughout, further filling the gaps between the terminal and the terminal clearance hole, forming a tighter and more reliable sealing structure, effectively improving the overall sealing performance of the battery.

[0014] Furthermore, in order to improve the connection reliability between the pole extension and the pole, the pole extension is welded to the pole.

[0015] Specifically, the following two welding methods can be used:

[0016] The aforementioned terminal extension has a recessed structure; the bottom of the recessed structure is used to connect with the terminal of a single battery cell by through welding.

[0017] The aforementioned pole extension has mounting holes; part of the pole structure is inserted into the mounting holes, the top end face of the pole is flush with the opening of the mounting hole, and is welded to the edge of the opening of the mounting hole.

[0018] Furthermore, the aforementioned battery component also includes a heat transfer tube, and the main body of the aforementioned electrode extension is provided with a heat transfer tube mounting structure. The heat transfer tube is installed inside the heat transfer tube mounting structure to realize heat exchange of the electrode extension.

[0019] 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.

[0020] Furthermore, the above-mentioned heat transfer tube mounting structure can adopt at least the following two structures:

[0021] The aforementioned heat transfer tube installation structure is a first through groove opened on the main body of the electrode extension member; the heat transfer tube extends along the arrangement direction of each individual cell and is snapped into the inner cavity of the first through groove on the main body of each extension member.

[0022] A first through slot is made in the electrode extension to hold a tubular heat transfer tube in place, 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 the heat transfer medium inside the tube and through heat exchange with the surrounding environment, thus achieving heat dissipation for the battery.

[0023] The aforementioned heat transfer tube mounting structure can also consist of two parallel second through slots formed on the main body of the pole extension member; the part of the main body of the pole extension member located between the two second through slots is defined as the first part of the main body of the pole extension member;

[0024] The heat transfer tube has an extension port on its wall; the heat transfer tube extends along the arrangement direction of the individual cells, and the two sides of the tube wall are respectively embedded in the two second through slots of each extension. The first part of the main body of each extension extends into the inner cavity of the heat transfer tube through the extension port; the extensions are sealed to each other, forming a heat transfer medium flow sub-cavity between the inner wall of the heat transfer tube and the first part of the main body of each extension.

[0025] Two second through slots are opened on the electrode extension component. After the tube walls on both sides of the heat transfer tube are respectively embedded into the two second through slots, the first part of the electrode extension component body is placed in the inner cavity of the heat transfer tube and directly contacts the heat transfer medium flowing in the inner cavity of the heat transfer tube. The heat transfer medium directly acts on the electrode extension component to realize heat exchange of the electrode extension component. It has a shorter heat exchange path, improves the utilization efficiency of the heat transfer medium, and improves the heat exchange efficiency of the battery.

[0026] This invention can also employ the following two methods to form two seals at the electrode clearance hole, further improving the sealing performance between the electrode and the electrode clearance hole:

[0027] Method 1: The edge of the hole near the individual cell of each terminal post is welded to the corresponding cell cover plate using filler wire welding to achieve a sealed connection.

[0028] Method 2: The battery component mentioned above also includes 2n hollow components; the 2n hollow components pass through the electrode clearance holes and are fitted around each electrode post, the bottom of the hollow component is laser welded to the first area of ​​the corresponding single cell, and the top of the hollow component is laser welded to the second area of ​​the top plate of the casing.

[0029] The first region mentioned above is the area surrounding any electrode post in the upper cover plate of any of the aforementioned individual cells;

[0030] The second region mentioned above is the region corresponding to any pole clearance hole on the top plate of the casing;

[0031] The aforementioned insulating seal is located between the pole and the hollow component, sealing the gap between the pole and the hollow component.

[0032] Furthermore, the aforementioned housing is equipped with a venting channel that communicates with the venting port, through which thermal runaway fumes are discharged in an orderly manner, thereby improving the safety performance of the battery components.

[0033] Furthermore, within the aforementioned casing, the internal cavities of each individual battery cell are interconnected, allowing for the sharing of electrolyte and / or gas. This interconnectedness of electrolyte and / or gas within each individual battery cell ensures that all cells operate within the same system, reducing differences between cells and improving consistency to some extent, thereby enhancing the cycle life of the battery assembly.

[0034] The beneficial effects of this utility model are:

[0035] This invention, by incorporating an insulating seal and applying pressure along the height of the electrode post using an extension member, effectively fills the gap between the electrode post and the electrode post clearance hole, forming a tight and stable sealing structure. This ensures that harmful fumes can only escape through a predetermined vent during thermal runaway, preventing leakage due to sealing defects, effectively protecting the battery structure's integrity, and significantly reducing the risk of thermal runaway hazard diffusion. Simultaneously, the electrode post adapter further compresses the insulating seal, preventing it from detaching and leaking fumes during thermal runaway. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the battery component in Example 1;

[0037] Figure 2 This is a schematic diagram of the exploded structure of the battery component in Example 1;

[0038] Figure 3 This is a cross-sectional view of the battery component in Example 1;

[0039] Figure 4 This is a schematic diagram of the structure of a pole post extension in Example 1;

[0040] Figure 5 This is a schematic diagram of another pole post extension component in Example 1;

[0041] Figure 6 This is a cross-sectional view of another battery component in Example 1;

[0042] Figure 7 This is a schematic diagram of the pole extension component in Example 3;

[0043] Figure 8 This is a cross-sectional view of the battery component in Example 3;

[0044] Figure 9 This is a schematic diagram of the exploded structure of the battery component in Example 3;

[0045] Figure 10 This is a cross-sectional view of the battery component in Example 4;

[0046] Figure 11 This is a cross-sectional view of the battery component in Example 6;

[0047] Figure 12 This is a partial enlarged cross-sectional view of the battery component in Example 6.

[0048] The attached figures are labeled as follows:

[0049] 1. Shell; 11. Explosion vent; 12. Top plate of shell; 13. Terminal clearance hole; 2. Single cell; 21. Terminal; 3. Insulating seal; 31. Flexible insulating sealing ring; 32. Pressure ring; 4. Terminal extension; 41. Main body of terminal extension; 42. Electrical connection post; 43. Recessed structure; 44. Through hole; 45. Mounting hole; 46. First through groove; 47. Second through groove; 48. First part of main body of terminal extension; 5. First heat transfer tube; 6. Second heat transfer tube; 7. Electrolyte sharing chamber; 8. Gas sharing chamber; 9. Hollow component. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] This utility model discloses a battery component, including a shell, n individual cells, 2n insulating seals, and 2n terminal extensions, where n is an integer greater than 1.

[0054] The casing is equipped with an explosion vent, through which thermal runaway fumes are discharged;

[0055] A rectangular shell is typically used. For ease of description, the length direction of the shell is defined as the x-direction, the width direction as the y-direction, and the height direction as the z-direction.

[0056] This utility model does not specifically limit the structure of the shell, but at least the following two structures can be adopted:

[0057] The first structure includes a first cylinder with open ends (i.e., the port parallel to the yz plane is an open end) and end plates fixed to the two open ends of the first cylinder (i.e., the end plates are parallel to the yz plane).

[0058] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the port parallel to the xy plane is the open end) and a first top plate and a bottom plate respectively fixed to the open ends at the top and bottom of the second cylinder (i.e., the first top plate and the bottom plate are both parallel to the xy plane, and the first top plate or bottom plate can be an integral structure with the second cylinder).

[0059] n individual battery cells are arranged along the x-direction inside the casing. The top plate of the casing (here, the top plate of the casing refers to the first cylindrical body top plate in the first structure and the first top plate in the second structure) has terminal clearance holes corresponding to the terminals of each individual battery cell. The terminals of each individual battery cell extend into the corresponding terminal clearance holes. Here, the terminals of each individual battery cell extending into the terminal clearance holes can be understood as the top of the terminal being located inside the terminal clearance holes, or it can extend out of the terminal clearance holes and be higher than the top plate of the casing.

[0060] It should be noted that:

[0061] The aforementioned battery components can be in the following two structural forms:

[0062] The first structure is a battery pack. Unlike traditional battery packs, the polarity terminals of each individual battery cell in this utility model battery pack (the polarity terminals here can be terminals or an integral structure after the terminals are connected to the terminal extension) need to extend out of the battery pack's encapsulation box (i.e., housing) through the terminal clearance hole. This facilitates electrical connection and helps dissipate heat. The housing can also be provided with a venting channel that connects to the venting port. The venting channel seals and covers the venting ports of each individual battery cell. Thermal runaway fumes are discharged in an orderly manner from the venting ports through the venting channel, effectively preventing thermal runaway fumes from spreading to the housing and affecting other individual batteries, thus aggravating thermal runaway.

[0063] The second type of structure is a high-capacity battery. Unlike the battery packs mentioned above, the internal cavities of each individual cell are interconnected within the casing, enabling electrolyte sharing and / or gas balance. This reduces the differences between individual cells within the casing and improves the performance of the high-capacity battery.

[0064] Typically, the internal cavities of individual cells can be connected through a shared chamber located within the casing (the shared chamber is connected to the explosion vent).

[0065] It should be noted that:

[0066] The aforementioned shared chamber can be an electrolyte shared 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 shared chamber described here is a liquid channel extending along the length (x-direction) 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 cell'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 the first cylindrical bottom plate; in the second type of casing structure, the casing's bottom plate here is simply the bottom plate.

[0067] The aforementioned shared chamber can also be a gas-sharing chamber located on the top plate of the casing, covering the gas inlets at the top of each individual battery cell.

[0068] It should be noted that in the shell of the first structure, the shell top plate here is the first cylindrical top plate; in the shell of the second structure, the shell top plate here is the first top plate.

[0069] It should also be noted that the gas port here is a through hole directly opened on the top cover of the individual cell and penetrating the inner cavity of the individual cell.

[0070] At this time, the gas-sharing chamber is connected to the gas region of each individual cell through the gas port. Based on the gas-sharing chamber, the gas regions 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 large-capacity battery 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 from the explosion vent through the gas-sharing chamber, thereby improving the safety of the large-capacity battery.

[0071] 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, which improves the performance and charge-discharge cycle life of large-capacity batteries.

[0072] Regardless of the battery component's structure, the seal between the terminals and the casing is of paramount importance.

[0073] For the first type of structure, once the sealing of this part fails, especially in the event of thermal runaway, the flue gas will most likely leak from the gap between the terminal and the casing, rather than being vented out through the explosion vent on the casing. This will not only further damage the structural integrity of the battery components themselves and exacerbate the severity of thermal runaway, but will also cause the surrounding environment to be quickly filled with harmful flue gas, posing a huge safety hazard to operators and surrounding facilities, and threatening life and property.

[0074] The second structure also suffers from the same thermal runaway issues as the first structure. Furthermore, the second structure typically contains free electrolyte within the casing. If the seal between the terminals and the casing fails, the electrolyte may leak out through the gaps, affecting the performance of high-capacity batteries. Simultaneously, the intrusion of outside air introduces moisture and impurities that may react chemically with the electrolyte, reducing its purity and activity, thereby impacting the battery's charge / discharge performance and shortening its lifespan.

[0075] To address the aforementioned issues, this invention specifically incorporates an insulating seal between each terminal post and its corresponding clearance hole. Furthermore, by pressing down on the insulating seal with a terminal post extension connected to the terminal post, it is compressed, causing radial deformation. This ensures the seal between the polarity terminal and the housing, guaranteeing the safe and stable operation of the battery components.

[0076] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0077] Example 1

[0078] This embodiment describes the battery component of the first structure described above, and its structure is as follows: Figures 1 to 3 As shown.

[0079] from Figure 1 , Figure 2 and Figure 3 As can be seen from the image, the battery component in this embodiment includes a housing 1 and a plurality of individual battery cells 2 arranged within the housing 1.

[0080] An explosion vent 11 is provided on the side wall of the casing 1. This explosion vent 11 can also be called an explosion-proof vent, explosion-proof section, explosion venting section, etc., and is used to allow thermal runaway flue gas inside the casing 1 to be discharged from here.

[0081] A terminal clearance hole 13 is provided on the top plate 12 of the casing corresponding to the terminal post 21 of each individual battery 2.

[0082] In this embodiment, the single battery cell 2 is a square-shell battery, and there are 13 of them. In other embodiments, the number and shape of the single battery cell 2 can be adjusted according to actual needs.

[0083] Thirteen individual battery cells 2 are arranged in the housing 1 along the x-direction, and the terminals 21 of the 13 individual battery cells 2 extend into the corresponding terminal clearance holes 13 on the top plate 12 of the housing.

[0084] In order for the pole post 21 to be able to smoothly extend into the corresponding pole post clearance hole 13, the opening size of the pole post clearance hole 13 must be slightly larger than the cross-sectional size of the corresponding pole post 21; in this way, after the pole post 21 is inserted, there will be a certain gap between the two.

[0085] The existence of this gap may cause the thermal runaway fumes to be discharged through this gap instead of being vented from the explosion vent 11 of the casing 1 when thermal runaway occurs. This will not only further damage the structural integrity of the battery components and exacerbate the severity of thermal runaway, but will also cause the surrounding environment to be quickly filled with harmful fumes, posing a huge safety hazard to operators and surrounding facilities and threatening life and property.

[0086] Combination Figures 1 to 3 As can be seen, this embodiment solves the above problem by sealing and fixing the insulating seal 3 between the pole post 21 and the corresponding pole post clearance hole 13, and fixing the pole post extension 4 on the pole post 21. The pole post extension 4 applies pressure to the insulating seal 3 along the height direction (along the z direction) of the pole post 21, so that the insulating seal 3 is compressed and undergoes radial deformation, thereby sealing the gap between the pole post 21 and the pole post clearance hole 13.

[0087] In this embodiment, the pole extension 4 is fixed to the pole 21 by welding. Specifically, the following two welding methods can be used:

[0088] Method 1: Through soldering;

[0089] When using through-welding, the corresponding pole extension 4 structure is as follows: Figure 4 As shown, the device includes a pole extension body 41. In order to facilitate the connection between the pole extension 4 and the pole 21, an electrical connection post 42 can also be provided at the bottom of the pole extension body 41 in this embodiment.

[0090] from Figure 4 As can be seen, the electrical connection post 42 is located at the bottom of the pole extension body 41 and protrudes from the pole extension body 41; in this embodiment, the pole extension body 41 and the electrical connection post 42 are an integral structure.

[0091] In this embodiment, the electrical connection post 42 has an overall columnar structure, and its cross-sectional shape is not specifically limited. It can be a quadrangular prism as shown in the figure, or it can be a cylinder, etc., mainly to adapt to the shape of the electrode post 21 to which it is connected. When the electrode post 21 of the single cell 2 to which it is connected has a square structure, the electrical connection post 42 adopts a quadrangular prism structure, which can achieve a larger contact area during connection and ensure good conductivity and connection stability; when the electrode post 21 of the single cell 2 to which it is connected has a cylindrical structure, the electrical connection post 42 adopts a cylindrical structure, and the two can fit better. The cross-sectional shape of the electrical connection post 42 is also adapted to the shape of the electrode post clearance hole 13 on the top plate of the housing.

[0092] To facilitate the connection between the terminal extension 4 and the terminal 21 of the single cell 2, such as Figure 3 and Figure 4As shown, in this embodiment, the main body 41 of the electrode extension member has a recessed structure 43 that is recessed into the electrical connection post 42 (this recessed structure can be a blind hole or a through groove, etc.); the bottom of the recessed structure 43 is connected to the electrode post 21 of the single cell 2 by through welding. In order to eliminate welding stress, a through hole 44 can be opened at the bottom of the recessed structure 43. The diameter of this through hole 44 is generally small, and is determined according to the size of the electrode post 21 and the welding process. It can effectively release the stress generated during the welding process, prevent the weld from cracking or the connection from deforming due to stress concentration, and improve the reliability and stability of the connection.

[0093] Method 2: Seam welding;

[0094] When using seam welding, the corresponding pole extension 4 structure is as follows: Figure 5 As shown, it includes a pole extension body 41. Similarly, in order to facilitate the connection between the pole extension 4 and the pole 21, an electrical connection post 42 protruding from the pole extension body 41 can also be provided at the bottom of the pole extension body 41.

[0095] A mounting hole 45 is provided on the main body 41 of the terminal extension member. The mounting hole 45 is a through hole, which is used to insert part of the structure of the terminal 21 of the single cell 2, thereby realizing the effective connection between the two.

[0096] During specific installation, in conjunction with Figure 6 As can be seen, the pole post 21 is inserted into the mounting hole 45 of the pole post extension 4, ensuring that the top end face of the pole post 21 is flush with the opening of the mounting hole 45, and the edge of the opening of the mounting hole 45 is welded to the edge of the top end face of the pole post 21.

[0097] In some other embodiments, a threaded connection can also be used to achieve a fixed connection between the pole extension 4 and the pole 21.

[0098] As can be seen from the above figures, the dimensions of the electrode extension body 41 and the electrical connection post 42 in this embodiment are somewhat different. In the x-direction, the dimension of the electrode extension body 41 is equal to the dimension of the electrical connection post 42. This dimensional design ensures that the entire electrode extension body 4 is subjected to uniform stress in the x-axis direction, resulting in excellent stability. From a manufacturing perspective, the design with the same length facilitates unified dimensional planning and processing during production, reducing processing difficulty and improving production efficiency. In the y-direction, the dimension of the electrode extension body 41 is larger than the dimension of the electrical connection post 42. This design allows the smaller electrical connection post 42 to easily extend into the pre-drilled electrode clearance hole 13 on the housing, thereby connecting with the electrode post 21 of the single battery 2 inside the housing. Simultaneously, a stepped structure is formed between the electrode extension body 41 and the electrical connection post 42, which can be used to press the insulating seal 3.

[0099] The insulating seal 3 is usually made of high-quality elastic material that is resistant to high temperature and chemical corrosion and has low air permeability. It can maintain stable performance in high temperature and complex chemical environments.

[0100] In this embodiment, the insulating seal 3 includes a flexible insulating sealing ring 31, which is a flexible stepped structure. The small diameter section of the stepped structure extends into the electrode clearance hole 13 and contacts the upper cover plate of the single cell 2. The large diameter section of the stepped structure is located outside the housing 1. The end face of the large diameter section near the small diameter section contacts the top plate 12 of the housing, and the end face away from the small diameter section contacts the electrode extension 4.

[0101] Under the downward pressure of the terminal extension 4, the inner wall of the flexible insulating sealing ring 31 is tightly fitted to the terminal 21, and the outer wall is tightly fitted to the wall of the terminal clearance hole 13, ensuring the sealing between the terminal 21 and the housing 1. When thermal runaway occurs, the thermal runaway flue gas is led out from the explosion vent 11 of the housing 1 for treatment, minimizing the risk of thermal runaway and ensuring the safe and stable operation of the battery pack.

[0102] In order to ensure that the pole extension 4 can uniformly apply clamping force to the insulating seal 3, thereby ensuring the insulation seal 3's sealing performance, from Figure 3 and Figure 6 As can be seen from the image, the insulating seal 3 may also include a pressure ring 32.

[0103] In terms of materials, the pressure ring 32 is usually made of high-strength metal materials with good thermal conductivity and corrosion resistance, such as stainless steel and aluminum alloy. These metal materials can not only withstand the large pressure applied by the terminal extension 4, ensuring that they do not deform or get damaged during the pressure process, but also play a stable downward pressure role for a long time in the complex working environment of the battery pack, avoiding the sealing effect due to corrosion and other problems.

[0104] In terms of structural design, the inner diameter of the pressure ring 32 is matched with the inner diameter of the large diameter section of the flexible insulating sealing ring 31. The outer diameter of the pressure ring 32 is larger than the dimension of the pole extension body 41 in the y direction, so that during the pressing of the pole extension 4, the larger outer diameter of the pressure ring 32 can form a larger force-bearing surface, and can form a uniform pressure distribution on the flexible insulating sealing ring 31, preventing the seal from failing due to excessive or insufficient local pressure.

[0105] During assembly, first, a flexible insulating sealing ring 31 is placed in the terminal clearance hole 13; the smaller diameter section of its stepped structure extends into the terminal clearance hole 13 and is in close contact with the upper cover plate of the single cell 2, while the larger diameter section of the stepped structure is located outside the housing 1 and fits against the top plate 12 of the housing; then, a pressure ring 32 is placed on the flexible insulating sealing ring 31; then, the terminal extension 4 is welded to the terminal 21. During the welding process, a downward pressure is applied along the height direction (along the z-direction) of the terminal 21. Under the action of this downward pressure, the pressure ring 32 pressurizes the pressure ring. The gas is evenly transferred to the flexible insulating sealing ring 31, causing the inner wall of the flexible insulating sealing ring 31 to fit tightly against the pole post 21, and the outer wall to fit tightly against the wall of the pole post clearance hole 13. This significantly enhances the sealing performance between the pole post 21 and the housing 1. In the event of thermal runaway of the battery pack, it can effectively prevent thermal runaway gas from escaping from the gap between the pole post 21 and the pole post clearance hole 13, ensuring that the thermal runaway gas is only led out from the explosion vent 11 of the housing 1 for treatment, thereby minimizing the risk of thermal runaway and ensuring the safe and stable operation of the battery pack.

[0106] In some other embodiments, the insulating seal 3 may also be an insulating seal layer disposed at the gap between the pole post clearance hole 13 and the pole post 21 by a casting process.

[0107] Example 2

[0108] This embodiment is another battery component. Unlike embodiment 1, this embodiment adds a heat transfer tube mounting structure on the electrode extension 4 to fix the heat transfer tube and realize heat exchange of the battery component based on the heat transfer tube.

[0109] For the specific structure of pole extension 4, please refer to... Figure 4 and Figure 5 As can be seen, in this embodiment, a first through groove 46 is opened on the main body 41 of the pole extension member to serve as the mounting structure for the first heat transfer tube 5.

[0110] Figure 4 In the middle, the first through groove 46 passes through the main body 41 of the pole post extension member along a direction perpendicular to the axis of the recessed structure 43, and is in communication with the recessed structure 43.

[0111] Figure 5 In the middle, the first through groove 46 extends through the main body 41 of the pole post extension member in a direction perpendicular to the axis of the mounting hole 45. The mounting hole 45 is located at the center of the bottom of the groove and extends perpendicularly through the bottom of the first through groove 46.

[0112] The inner shape of the first through groove 46 is adapted to the cross-sectional shape of the first heat transfer tube 5, ensuring that the first heat transfer tube 5 is tightly clamped within it. This ensures installation stability while also guaranteeing the heat transfer effect between the first heat transfer tube 5 and the pole extension 4. As can be seen from the figure, this embodiment uses a rectangular first through groove 46, and the first heat transfer tube 5 adapted to it should be a square tube.

[0113] Combination Figure 1 , Figure 2 , Figure 3 and Figure 6 This embodiment includes two first heat transfer pipes 5, which are fixed along the x-direction within the first through grooves 46 of each electrode extension 4 located on the same side. Based on this, during the operation of the battery component, efficient heat exchange can be achieved with the help of the first heat transfer pipes 5, effectively ensuring that the battery component operates stably at a suitable temperature.

[0114] Example 3

[0115] Unlike the pole extension member 4 in Embodiment 2, this embodiment, based on Embodiment 1, has two second through slots 47 opened on the pole extension member body 41 as a heat transfer tube installation structure.

[0116] The heat transfer tube that works with it is defined as the second heat transfer tube 6. The second heat transfer tube 6 has a relief opening for the pole extension 4 on its tube wall, and the two side walls are used to be embedded in the two second through slots 47 of the pole extension 4 respectively.

[0117] like Figure 7 As shown, Figure 7 Taking the example of a structure with mounting holes 45 and welded to the pole post 21 by seam welding, this embodiment has two parallel second through slots 47 on the pole post extension body 41. The second through slots 47 penetrate the pole post extension body 41 in the x-direction, and the two second through slots 47 are spaced apart in the y-direction. For ease of description, the portion located between the two second through slots 47 is defined as the first portion 48 of the pole post extension body.

[0118] The shape of the cross-section of the second channel 47 mainly conforms to the shape of the wall of the second heat transfer tube 6 that is embedded in the second channel 47. It should be noted that the cross-section mentioned here is the cross-section obtained by cutting the second channel 47 along a plane perpendicular to the x-direction. For example, as can be seen from the figure, the cross-section of the second channel 47 in this embodiment is rectangular, and correspondingly, the cross-section of the second heat transfer tube 6 embedded in the wall of the second channel 47 is also rectangular, for example, it can be a rectangular tube. In some other embodiments, the cross-section of the second channel 47 can be arc-shaped, and correspondingly, the cross-section of the second heat transfer tube 6 embedded in the wall of the second channel 47 is also arc-shaped, for example, a tube with a semi-circular cross-section can be used.

[0119] The width dimension (in the y direction) of the second through groove 47 mentioned above needs to ensure that the wall of the corresponding second heat transfer tube 6 can be embedded, and there is a certain gap between the inner wall of the second heat transfer tube 6 and the first part 48 of the pole extension body to allow the heat transfer medium to flow.

[0120] like Figure 8 and Figure 9 The figures show a cross-sectional view and an exploded view of the battery component in this embodiment. As can be seen from the figures, this embodiment includes two second heat transfer tubes 6. Each second heat transfer tube 6 extends along the x-direction and the two second heat transfer tubes 6 are arranged along the y-direction and are respectively embedded in the second through grooves 47 of each pole post extension 4 located on different sides.

[0121] When the second heat transfer tube 6 is embedded in the second through groove 47, the first part 48 of the main body of each pole extension 4 extends into the inner cavity of the second heat transfer tube 6 through the clearance opening of the pole extension 4 opened on the tube wall of the second heat transfer tube 6. At the same time, a certain gap is reserved between the first part 48 of the main body of the pole extension and the inner wall of the second heat transfer tube 6 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 4 with the clearance opening of the pole extension 4.

[0122] Sealing measures can be implemented 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 within the closed sub-cavity.

[0123] In this embodiment, for a second heat transfer tube 6 on the same side, the heat transfer medium flows in from one end of the second heat transfer tube 6, flows sequentially through the sub-cavities surrounding the first portion 48 of all the electrode extension body bodies located within the inner cavity of the second heat transfer tube 6, and flows out from the other end of the second heat transfer tube 6. A portion of the structure of the battery electrode extension 4 is directly placed inside the heat exchange channel. The electrode extension 4 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 4 is directly connected to the heat transfer medium, allowing the heat transfer medium to act directly on the electrode extension 4 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 heat exchange efficiency of the entire battery component is also greatly improved. The problem of battery performance degradation that might have been caused by untimely heat exchange is solved by this efficient heat exchange design, thereby ensuring that the battery components are always in good working condition, extending the service life of the battery components and improving their operational stability.

[0124] Example 4

[0125] This embodiment presents another battery component, differing from the battery components in the above embodiments in that the battery component in this embodiment has the second structure described above, as shown in the specific structure below. Figure 10 As shown.

[0126] In this embodiment, a support extending in the x-direction is provided between the bottom plate of the casing and each individual battery 2 assembly to form a liquid channel, which serves as a shared electrolyte chamber 7.

[0127] The top plate of the shell 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 8.

[0128] In this embodiment, the structure of the pole extension 4, the connection method between the pole extension 4 and the pole 21, and the sealing structure between the pole 21 and the pole clearance hole 13 are the same as in the above embodiment, and will not be repeated here. Figure 10 Taking the example of a heat transfer tube installation structure with mounting holes 45 in the pole extension member 4, welded to the pole 21 by seam welding, and a first through groove 46 in the pole extension member body 41.

[0129] Example 5

[0130] Unlike the above embodiments, this embodiment further enhances the sealing performance between the terminal post 21 and the terminal post clearance hole 13 by sealing the terminal post clearance hole 13 with the corresponding single cell 2 cover plate.

[0131] Specifically, in this embodiment, the edge of the electrode clearance hole 13 near the single cell 2 can be sealed to the upper cover plate of the single cell 2 by filler wire welding.

[0132] Taking the welding process described above as an example, based on Example 4, the specific assembly process is as follows:

[0133] First, place the 12 individual battery cells 2 into the housing, so that the terminal post 21 of each individual battery cell 2 corresponds one-to-one with the terminal post clearance hole 13.

[0134] Then, the edge of the terminal clearance hole 13 near the single cell 2 is welded to the upper cover plate of the single cell 2 by filler wire welding to achieve a sealed connection.

[0135] Next, a flexible insulating sealing ring 31 is placed in the terminal clearance hole 13; the small diameter section of its stepped structure extends into the terminal clearance hole 13 and is in close contact with the upper cover plate of the single cell 2, and the large diameter section of the stepped structure is located outside the housing 1 and fits against the top plate 12 of the housing; then a pressure ring 32 is placed on the flexible insulating sealing ring 31.

[0136] Afterwards, the pole extension 4 is welded to the pole 21. During the welding process, a downward pressure is applied along the height direction (along the z direction) of the pole 21. Under the action of this downward pressure, the pressure ring 32 transmits the pressure evenly to the flexible insulating sealing ring 31, causing the inner wall of the flexible insulating sealing ring 31 to fit tightly against the pole 21, and the outer wall to fit tightly against the wall of the pole clearance hole 13.

[0137] Finally, the first heat transfer tube 5 is fixed on each pole extension 4.

[0138] In this embodiment, the insulating sealant 3 tightly fills the gap between the terminal post 21 and the clearance hole, forming the first sealing barrier. This effectively prevents the leakage of gases, electrolytes, and other substances inside the battery, while also preventing external air, moisture, and impurities from entering the battery. The filler wire welding, by filling the gap between the terminal post clearance hole 13 and the upper cover plate of the individual battery 2 with welding wire of varying thicknesses, allows the welding wire to fully fuse with the edge of the hole and the upper cover plate at high temperature, forming a continuous and dense weld, thus constituting the second sealing line. This line of defense, thanks to the flexible adjustment of the welding wire thickness in filler wire welding, fills the height differences between the individual batteries 2, ensuring a tight fit between the terminal post clearance hole 13 and the upper cover plate of the individual battery 2, achieving reliable welding. The dual sealing structures work together; even if one line of defense fails partially, the other line of defense can still ensure the battery's sealing performance, significantly reducing the risk of leakage and ensuring the battery maintains a good sealing state under various operating conditions.

[0139] Example 6

[0140] Unlike the above embodiments, this embodiment, based on the above embodiments, also uses a hollow component 9 to seal the top plate area of ​​the housing corresponding to the pole clearance hole 13 to the top cover plate of each individual battery 2, so as to further enhance the sealing performance between the pole 21 and the pole clearance hole 13.

[0141] Specifically, such as Figure 11 and Figure 12 As shown, the battery component in this embodiment also includes multiple hollow components 9, similar to a hollow tubular structure; each hollow component 9 passes through the terminal clearance hole 13 and is fitted around each terminal 21. The bottom of the hollow component 9 is laser-welded to the first region of the corresponding single cell 2, and the top of the hollow component 9 is laser-welded to the second region of the top plate 12 of the casing; wherein, the first region is the region around any terminal 21 in the upper cover of any single cell 2; the second region is the region corresponding to any terminal clearance hole 13 on the top plate 12 of the casing; wherein the region corresponding to the terminal clearance hole 13 can be the hole wall of the terminal clearance hole 13, or it can be the region around the terminal clearance hole 13 on the top plate 12 of the casing.

[0142] After the hollow component 9 is installed, the insulating seal 3 is located between the pole post 21 and the hollow component 9, sealing the gap between the pole post 21 and the hollow component 9.

[0143] Taking the welding process described above as an example, based on Example 4, the specific assembly process is as follows:

[0144] First, place the 12 individual battery cells 2 into the housing, so that the terminal post 21 of each individual battery cell 2 corresponds one-to-one with the terminal post clearance hole 13.

[0145] Then, each hollow component 9 is inserted into the pole clearance hole 13 and set around each pole 21. The bottom of the hollow component 9 is laser welded to the first area of ​​the corresponding single cell 2, and the top of the hollow component 9 is laser welded to the second area of ​​the shell top plate 12.

[0146] Next, a flexible insulating sealing ring 31 is placed in the terminal clearance hole 13; the small diameter section of its stepped structure extends into the terminal clearance hole 13 and is in close contact with the upper cover plate of the single cell 2, and the large diameter section of the stepped structure is located outside the housing 1 and fits against the top plate 12 of the housing; then a pressure ring 32 is placed on the flexible insulating sealing ring 31.

[0147] Afterwards, the pole extension 4 is welded to the pole 21. During the welding process, a downward pressure is applied along the height direction (along the z direction) of the pole 21. Under the action of this downward pressure, the pressure ring 32 transmits the pressure evenly to the flexible insulating sealing ring 31, causing the inner wall of the flexible insulating sealing ring 31 to fit tightly against the pole 21, and the outer wall to fit tightly against the wall of the pole clearance hole 13.

[0148] Finally, the first heat transfer tube 5 is fixed on each pole extension 4.

[0149] The hollow component 9 has a certain length redundancy design, which can cover the possible height difference between the top cover plate of the single cell 2 and the top plate 12 of the casing. After the bottom of the hollow component 9 and the first area of ​​the corresponding single cell 2 are laser welded together, when the height of the single cell 2 is moderate, the top end face of the hollow component 9 is flush with the edge of the hole of the pole post avoidance hole 13. At this time, the joint between the two is welded. When the height of the single cell 2 is low, the top end face of the hollow component 9 will be lower than the hole of the pole post avoidance hole 13. At this time, the top end face of the hollow component 9 can be welded to the hole wall of the pole post avoidance hole 13.

[0150] Based on the above analysis, it can be seen that the hollow component 9 can also compensate for the height difference between each individual battery cell 2, ensuring reliable sealing and welding of the electrode clearance hole 13.

[0151] In this embodiment, the insulating sealant 3 tightly fills the gap between the terminal post 21 and the hollow component 9, forming the first sealing barrier. This effectively prevents the leakage of gases, electrolytes, and other substances inside the battery, while also preventing external air, moisture, and impurities from entering the battery. The hollow component 9, through laser welding of its bottom to the top cover of the individual battery 2 and its top to the top plate 12 of the casing, along with flexible welding strategies tailored to the height differences of different individual batteries 2, constitutes the second sealing line. This dual sealing structure works in tandem; even if one line of defense fails partially, the other line can still ensure the battery's sealing performance, significantly reducing the risk of leakage and ensuring the battery maintains a good sealing state under various operating conditions.

Claims

1. A battery component, characterized in that: It includes a casing, n individual battery cells, 2n insulating seals, and 2n terminal extensions, where n is an integer greater than 1; The casing is provided with an explosion vent, and n individual batteries are arranged inside the casing. The top plate of the casing has a terminal clearance hole corresponding to the terminal of each individual battery. The terminal of each individual battery extends into the corresponding terminal clearance hole. 2n insulating seals are installed one by one in the gap between the terminal post and the terminal post clearance hole of each individual battery cell; 2n pole extensions are connected one-to-one with the poles and pressure is applied to the insulating seal along the pole height direction, so that the insulating seal is compressed and the gap between the pole and the pole clearance hole is sealed.

2. The battery component according to claim 1, characterized in that: The insulating seal includes a flexible insulating sealing ring; The flexible insulating sealing ring has a flexible stepped structure. The small-diameter section of the stepped structure extends into the electrode clearance hole and contacts the top cover of the single battery cell. The large-diameter section of the stepped structure is located outside the housing. The end face of the large-diameter section near the small-diameter section contacts the top plate of the housing, and the end face away from the small-diameter section contacts the electrode extension.

3. The battery component according to claim 2, characterized in that: The insulating seal also includes a pressure ring; The pressure ring is a metal component and is disposed between the large-diameter section of the flexible insulating sealing ring and the pole extension component.

4. The battery component according to any one of claims 1 to 3, characterized in that: The pole extension is welded to the pole.

5. The battery component according to claim 4, characterized in that: The electrode extension has a recessed structure; the bottom of the recessed structure and the single battery electrode are connected by through welding.

6. The battery component according to claim 4, characterized in that: The pole extension has a mounting hole; part of the pole structure is inserted into the mounting hole, the top end face of the pole is flush with the opening of the mounting hole, and is welded to the edge of the opening of the mounting hole.

7. The battery component according to claim 4, characterized in that: It also includes a heat transfer tube; the main body of the pole extension is provided with a heat transfer tube mounting structure; the heat transfer tube is installed in the heat transfer tube mounting structure to realize heat exchange of the pole extension.

8. The battery component according to claim 7, characterized in that: The heat transfer tube mounting structure is a first through groove opened on the main body of the electrode extension member. The heat transfer tube extends along the arrangement direction of the individual cells and is snapped into the inner cavity of the first through groove on the main body of each extension member.

9. The battery component according to claim 7, characterized in that: The heat transfer tube mounting structure consists of two parallel second through slots formed on the main body of the pole extension component. The main body of the pole post extension located between the two second through slots is defined as the first part of the main body of the pole post extension; The heat transfer tube has an extension port on its wall; the heat transfer tube extends along the arrangement direction of the individual cells, and the two sides of the tube wall are respectively embedded in the two second through slots of each extension. The first part of the main body of each extension extends into the inner cavity of the heat transfer tube through the extension port; the extensions are sealed to each other, forming a heat transfer medium flow sub-cavity between the inner wall of the heat transfer tube and the first part of the main body of each extension.

10. The battery component according to claim 1, characterized in that: The edge of the aperture of each terminal post near the individual cell is sealed to the corresponding cell cover plate by filler wire welding.

11. The battery component according to claim 1, characterized in that: It also includes 2n hollow components; the 2n hollow components pass through the electrode post clearance holes and are set around each electrode post. The bottom of the hollow component is laser-welded to the first area of ​​the corresponding single cell, and the top of the hollow component is laser-welded to the second area of ​​the shell top plate. The first region is the region surrounding any electrode post in the upper cover plate of any of the individual cells; The second region is the region corresponding to any one of the pole clearance holes on the top plate of the housing; The insulating seal is located between the pole and the hollow component, sealing the gap between the pole and the hollow component.

12. The battery component according to claim 1, characterized in that: The housing is provided with a venting channel that communicates with the venting port. The venting channel is sealed and covers the venting port of each individual battery cell, and the thermal runaway flue gas is discharged in an orderly manner through the venting channel.

13. The battery component according to claim 1, characterized in that: Inside the casing, the cavities of each individual battery cell are interconnected.

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