Battery cell, battery device, and electric device

Abstract

A battery cell (20), a battery device, and an electric device. The battery cell comprises: a housing component (21) comprising a first wall provided with a mounting hole; an electrode component (22) accommodated in the housing component; a terminal component (23) mounted in the mounting hole and comprising a terminal body (231), an adapter structure and an insulating sealing structure (233), wherein the terminal body is connected to the electrode component, the adapter structure is arranged around the circumference of the terminal body and is connected to the first wall, and the insulating sealing structure is fitted between the terminal body and the adapter structure; the adapter structure comprises a connecting arm (2321), a cantilever arm (2322), and a transverse arm (2323); the transverse arm is provided with a first protrusion (23231); and in the direction of thickness of the first wall, at least the portion of the transverse arm provided with the first protrusion and the cantilever arm clamp an edge portion (2312) of the terminal body at two ends thereof via the insulating sealing structure.

Description

Battery cells, battery packs and electrical devices Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] A battery pack typically consists of a housing and multiple battery cells housed within it. The battery cell, as the core component of the battery pack, has stringent requirements regarding both safety and lifespan. To ensure stability within the battery cell, its casing needs to maintain a high degree of airtightness with the external environment. Therefore, further improving the airtightness between the battery cell's internal structure and its external environment has become one of the problems that needs to be solved.

[0003] Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell and the battery device.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing component including a first wall having a mounting hole; an electrode component housed within the housing component; and a terminal component mounted at the mounting hole, comprising a terminal body, a connecting structure, and an insulating sealing structure. The terminal body is connected to the electrode component, the connecting structure is circumferentially arranged around the terminal body and connected to the first wall, and the insulating sealing structure is insulatingly and sealingly fitted between the terminal body and the connecting structure. The connecting structure includes a connecting arm, and a cantilever and a cross arm connecting the connecting arm. The cross arm is closer to the first wall than the cantilever and has a first protrusion protruding towards the cantilever. Along the thickness direction of the first wall, at least the position where the cross arm has the first protrusion is clamped together with the cantilever at both ends of the edge portion of the terminal body by the insulating sealing structure.

[0006] In the above technical solution, by configuring the electrode post component to include an electrode post body, a connecting structure, and an insulating sealing structure, the connecting structure can be used to connect the electrode post body and the first wall of the housing component. Since the connecting structure includes a connecting arm, a cantilever, and a cross arm, these components can form a groove structure, and the cross arm has a first protrusion protruding towards the cantilever. The connecting structure is clamped onto the edge of the electrode post body by the insulating sealing structure. In this structure, the connecting structure, through the groove structure and the first protrusion, can form a relatively complex insulation and sealing path with the insulating sealing structure, thereby creating a larger contact surface. This enhances the insulation and sealing effect, which is beneficial to improving the reliability of the battery cell. The first protrusion can further compress the insulating sealing structure, increasing the compression between the cross arm and the edge, making the insulating sealing structure more compact, further improving insulation and sealing performance, and also contributing to improving the reliability of the battery cell.

[0007] In some embodiments of this application, the first protrusion is located at the end of the cross arm away from the connecting arm.

[0008] In the above technical solution, since the first protrusion is located at the end of the cross arm, while ensuring that the insulating and sealing structure has a large contact surface at the cross arm and edge, and good insulation and sealing performance, it is beneficial to reduce the size of the cross arm and make the structure of the transition structure more compact. This reduces the weight of the transition structure and helps to improve the unit volume energy density of the battery cell. Moreover, the first protrusion is located at the end of the cross arm, making it easier to form the first protrusion on the cross arm, reducing the forming difficulty of the first protrusion, improving manufacturability, and the reduction in forming difficulty also helps to improve the product yield.

[0009] In some embodiments of this application, the cross arm and the first protrusion together form an outer annular surface facing the edge; the insulating sealing structure includes a seal, the seal including a first sealing portion, the first sealing portion being insulating and sealingly fitted between the outer annular surface and the edge. Using the above structure, the first sealing portion can form a larger sealing surface between the cross arm and the edge, which can provide better sealing between the cross arm and the edge, reducing the risk of electrolyte leakage between the cross arm and the edge, thereby improving the reliability of the electrode post component, and further improving the reliability of the battery cell.

[0010] In some embodiments of this application, the cross arm and the first protrusion together form an inner annular surface surrounding the electrode body; the seal includes a second sealing portion, which is insulated and sealably fitted between the inner annular surface and the electrode body, and connects to the first sealing portion. This structure allows for a more compact connection between the seal and the cross arm, improving the reliability of the connection between the seal and the cross arm. It also increases the sealing surface area of ​​the seal and the cross arm, thereby further improving the sealing performance and the reliability of the electrode component, ultimately enhancing the reliability of the battery cell.

[0011] In some embodiments of this application, the height of the cross arm along the thickness direction of the first wall is H1, and the protrusion height of the first protrusion is H2, wherein 0.2≤H2 / H1≤0.3.

[0012] In the above technical solution, by setting the protrusion height of the first protrusion and the height of the cross arm within the aforementioned range, the protrusion height of the first protrusion can be controlled within a suitable range. This reduces the risk of the cross arm breaking due to exceeding the material's ductility limit caused by a large first protrusion height. It also reduces the risk of stress concentration points appearing in the cross arm due to a large first protrusion height, which could lead to deformation or damage to the cross arm structure. In other words, the above solution ensures the overall reliability of the cross arm. Furthermore, controlling the protrusion height of the first protrusion within a suitable range also reduces the molding difficulty of the first protrusion, improves its manufacturability, and thus reduces costs.

[0013] In some embodiments of this application, the pole body includes a connected main body and an edge portion, the edge portion is circumferentially arranged around the main body, and the edge portion is provided with a second protrusion protruding toward the cross arm.

[0014] In the above technical solution, the cooperation between the second protrusion and the first protrusion enables the insulating sealing structure to have a greater compression amount, and further increases the complexity of the insulation and sealing path of the insulating sealing structure. It also increases the contact surface between the cross arm and the edge, thereby significantly improving the insulation and sealing performance of the insulating sealing structure and further improving the reliability of the battery cell.

[0015] In some embodiments of this application, the second protrusion and the first protrusion are staggered along the thickness direction of the connecting arm.

[0016] In the above technical solution, the second protrusion and the first protrusion are staggered, thereby forming a meandering insulating sealing surface between the cross arm, the first protrusion, the second protrusion, and the edge portion. This increases the complexity of the insulation and sealing path and also increases the contact area. Furthermore, it allows the insulating sealing structure to be compressed more tightly, making it less likely to detach from the groove structure formed between the cross arm and the edge portion along the thickness direction of the connecting arm. This improves the installation reliability of the insulating sealing structure, and consequently, the reliability of insulation and sealing. Furthermore, this structure, while achieving high insulation and sealing performance, allows for a more compact arrangement of the cross arm and the edge portion along the thickness direction of the first wall. This improves the overall structural compactness of the electrode post component, reducing its overall volume and increasing the unit volume energy density of the battery cell.

[0017] In some embodiments of this application, along the thickness direction of the connecting arm, the projection of the first protrusion on the connecting arm and the projection of the second protrusion on the connecting arm overlap.

[0018] In the above technical solution, by overlapping the projections of the first protrusion on the connecting arm and the second protrusion on the connecting arm, the portion of the insulating sealing structure located between the cross arm and the edge can be compressed to form an "S" shape. This allows the insulating sealing structure to form a more complex insulation and sealing path between the cross arm and the edge, and provides a larger contact surface, further improving the durability and reliability of insulation and sealing. This structure, which allows the partial compression of the insulating sealing structure to form an "S" shape, also further reduces the probability of the insulating sealing structure detaching from between the cross arm and the edge, improving the overall reliability of the terminal post component. Using this structure can also further improve the structural compactness of the terminal post component, which is beneficial for further reducing the volume of the terminal post component, thereby increasing the energy density per unit volume of the battery cell.

[0019] In some embodiments of this application, the insulating sealing structure includes a seal that is insulating and sealingly fitted between the pole body and the cross arm; wherein, along the thickness direction of the first wall, the projection of the second protrusion on the first wall and the projection of the seal on the first wall at least partially overlap.

[0020] In the above technical solution, the sealing element, as a component that plays a sealing role between the electrode body and the cross arm, has the second protrusion at least partially overlapping the projection of the second protrusion on the first wall with the projection of the sealing element on the first wall. Thus, the second protrusion can play a role in compressing the sealing element, increasing the compression amount of the sealing element, improving the sealing performance between the electrode body and the cross arm, reducing the risk of electrolyte leakage, and thereby improving the reliability of the electrode component, which in turn can improve the reliability of the battery cell.

[0021] In some embodiments of this application, the projection of the second protrusion onto the first wall is entirely within the projection of the seal onto the first wall. In the above technical solution, the second protrusion can have a larger contact surface with the seal, exerting a greater compressive force on the seal, thereby enabling the seal to have a greater compression amount and improving the sealing reliability between the terminal body and the cross arm. The second protrusion can also press the seal more firmly, thereby reducing the probability of the seal detaching from the terminal body and the cross arm, improving the installation reliability of the seal, and also contributing to improved sealing reliability and the reliability of the battery cell.

[0022] In some embodiments of this application, the two opposite ends of the second protrusion are provided with transition fillets or chamfers along the thickness direction of the connecting arm. In this technical solution, whether transition fillets or chamfers are provided at the two opposite ends of the second protrusion, the above-mentioned structure can reduce the probability of stress concentration on the second protrusion, improve the overall reliability of the edge portion, and reduce the probability of sharp structures on the second protrusion. This can reduce the probability of the pole component scratching workers during assembly and improve the ease of assembly.

[0023] In some embodiments of this application, the insulating sealing structure includes a first insulating member, the connecting arm and the cantilever are insulatedly connected to the pole body through the first insulating member, and the cantilever is provided with a third protrusion protruding toward the cross arm.

[0024] In the above technical solution, the cantilever compresses the first insulating component through the third protrusion, thereby creating a larger contact area between the cantilever and the first insulating component. This allows for the formation of a more complex insulation path between the first insulating component and the cantilever, improving the insulation performance of the first insulating component, enhancing the insulation of the terminal post assembly, and increasing the reliability of the battery cell. The third protrusion also presses the first insulating component firmly, strengthening its restraint and limiting effect, reducing the likelihood of the first insulating component detaching from the cantilever and the terminal post body. This improves the installation reliability and stability of the first insulating component, which in turn contributes to enhancing the reliability of the battery cell.

[0025] In some embodiments of this application, the height of the cantilever along the thickness direction of the first wall is H3, and the protrusion height of the third protrusion is H4, wherein 0.2≤H4 / H3≤0.3.

[0026] In the above technical solution, by setting the protrusion height of the third protrusion and the height of the cantilever within the aforementioned range, the protrusion height of the third protrusion can be controlled within a suitable range. This reduces the risk of the cantilever breaking due to exceeding the material's ductility limit caused by a large third protrusion height. It also reduces the risk of stress concentration points appearing on the cantilever due to a large third protrusion height, which could lead to deformation or damage to the cantilever structure. In other words, the above solution ensures the overall reliability of the cantilever. Furthermore, controlling the protrusion height of the third protrusion within a suitable range also reduces the molding difficulty of the third protrusion, improves its manufacturability, and thus reduces costs.

[0027] In some embodiments of this application, the pole body includes a connected main body and an edge portion, the edge portion is circumferentially arranged around the main body, and the edge portion is provided with a fourth protrusion protruding toward the cantilever.

[0028] In the above technical solution, the cooperation between the fourth protrusion and the third protrusion enables the first insulating member to have a greater amount of compression and further increases the complexity of the insulation path between the cantilever and the edge, thereby improving the insulation of the first insulating member and further improving the reliability of the battery cell.

[0029] In some embodiments of this application, the fourth protrusion and the third protrusion are staggered along the thickness direction of the connecting arm.

[0030] In the above technical solution, the fourth protrusion and the third protrusion are staggered, thereby forming a meandering insulation path between the cantilever, the third protrusion, the fourth protrusion, and the edge portion. This increases the contact area and compresses the first insulating component more tightly, making it less likely to detach from the groove structure formed between the cantilever and the edge portion along the thickness direction of the connecting arm. This improves the installation reliability of the first insulating component, and thus improves the insulation reliability. Furthermore, this structure allows for a more compact arrangement of the cantilever and the edge portion along the thickness direction of the first wall while maintaining high insulation performance. This improves the overall structural compactness of the electrode post component, which helps reduce the overall volume of the battery cell and increase its volumetric energy density.

[0031] In some embodiments of this application, the opposite ends of the fourth protrusion are provided with transition fillets or chamfers along the thickness direction of the connecting arm. By adopting the above structure, the probability of stress concentration on the fourth protrusion can be reduced, the overall reliability of the edge portion can be improved, and the probability of sharp structures on the fourth protrusion can be reduced, thereby reducing the risk of workers being scratched by the pole component during assembly and improving the ease of assembly.

[0032] In some embodiments of this application, the adapter structure is an integrally molded part and includes a pre-formed part and a riveting part. The pre-formed part is connected to the first wall and includes a cross arm. The riveting part is connected to the pre-formed part and includes a connecting arm and a cantilever. And / or, the adapter structure and the housing component are integrally formed.

[0033] In the above technical solution, the adapter structure is a one-piece molded component, and the connecting arm and cantilever are formed by riveting. This results in good overall consistency of the adapter structure and fewer connection gaps, enhancing the connection strength between the adapter structure and the terminal body, reducing the risk of loosening. Furthermore, the riveting and tightening method creates a good sealing effect, further improving the sealing performance between the adapter structure and the terminal body, which is beneficial to improving the reliability of the adapter structure and thus the reliability of the terminal component. The adapter structure and the housing component are integrated, ensuring high consistency in the structure formed by the two components, further reducing connection gaps, enhancing the sealing effect, improving the reliability of the battery cell, reducing the number of parts, reducing assembly steps, and improving work efficiency.

[0034] In some embodiments of this application, the first wall has an outer wall surface away from the electrode component. Along the thickness direction of the first wall, the connecting arm forms a first projection on the plane where the outer wall surface is located, and the cantilever forms a second projection on the plane where the outer wall surface is located. In the thickness direction of the connecting arm, the size of the first projection is smaller than the size of the second projection.

[0035] In the above technical solution, the connecting arm can be a vertical arm perpendicular to or approximately perpendicular to the first wall. On the one hand, this reduces the compressive force arm of the transition structure on the insulating and sealing structure, enhances the compressive effect of the cantilever on the portion of the insulating and sealing structure located between the edge and the horizontal arm, improves the insulation and sealing effect, and helps improve the insulation and sealing reliability of the insulating and sealing structure between the edge and the horizontal arm, thereby improving the overall reliability of the battery cell. On the other hand, the above structure also makes the transition structure more compact, thus making the overall structure of the terminal post component more compact. As a result, the terminal post body can have a larger exposed surface, which helps to increase the current-carrying area of ​​the terminal post body and improve the current-carrying capacity of the terminal post body.

[0036] In some embodiments of this application, the connecting arm is perpendicular to the first wall. In this technical solution, by making the connecting arm perpendicular to the first wall, the compression arm of the adapter structure on the insulating sealing structure can be smaller, further enhancing the insulation and sealing effect of the insulating sealing structure and improving the reliability of the battery cell. Secondly, adopting the above structure also makes the adapter structure more compact, thereby further reducing the size of the adapter structure. Under the premise of the same size electrode component, the electrode body has a larger exposed surface, further improving the current carrying capacity of the electrode body. Furthermore, making the connecting arm perpendicular to the first wall is easier to achieve during manufacturing, improving manufacturability and reducing costs.

[0037] In some embodiments of this application, the cantilever includes a root and a beam, the beam being connected to the connecting arm via a rounded transition at the root; the insulating sealing structure includes a seal, the seal being at least partially insulating and sealingly fitted between the crossarm and the edge portion.

[0038] In the above technical solution, by configuring the cantilever as described, the beam is connected to the connecting arm via a rounded transition at the root, resulting in a smoother and more rounded connection between the cantilever and the connecting arm, thus reducing the likelihood of stress concentration. Furthermore, by including a sealant in the insulation and sealing structure, the sealant effectively seals the area between the crossarm and the edge, reducing the probability of seal failure at the location of the terminal post and improving the reliability of the battery cell.

[0039] In some embodiments of this application, the beam portion is inclined or bent relative to the root portion toward the first wall.

[0040] In the above technical solution, the above structure can improve the overall strength of the cantilever. Moreover, the tilting or bending direction of the cantilever is opposite to the direction in which the pole body is forced to detach from the transfer structure, and also opposite to the bending direction of the edge. This helps to increase the difficulty of bending the edge towards the side closer to the first wall and reduce the risk of the connecting arm bending away from the pole body. This can reduce the probability of the pole body being forced to detach from the transfer structure, improve the overall reliability of the pole component, and further improve the reliability of the insulation and sealing structure, thereby improving the reliability of the battery cell.

[0041] In some embodiments of this application, the included angle between the beam and the connecting arm is θ1, where 85 degrees ≤ θ1 ≤ 95 degrees. In this technical solution, by setting the included angle θ1 between the beam and the connecting arm within the aforementioned range, a suitable included angle value can be flexibly selected according to the size of the pole body, adjusting the structural strength and stiffness of the structure formed by the beam and the connecting arm to meet the stiffness and strength requirements of transition structures of different sizes.

[0042] In some embodiments of this application, the beam portion is provided with a third protrusion protruding towards the cross arm, and the third protrusion is inclined or bent relative to the beam portion towards the connecting arm. In this technical solution, the above structure can increase the number of bending positions and bending times on the cantilever, thereby further improving the structural strength and stiffness of the cantilever, reducing the probability that the electrode body will force the adapter structure to deform and cause the electrode body to detach from the adapter structure, thus improving the reliability of the electrode component and consequently improving the overall reliability of the battery cell.

[0043] In some embodiments of this application, the included angle between the third protrusion and the beam is θ2, where 85 degrees ≤ θ2 ≤ 95 degrees. In this technical solution, by setting the included angle θ2 between the third protrusion and the beam within the aforementioned range, a suitable included angle value can be flexibly selected according to the size of the pole body, adjusting the structural strength and stiffness of the structure formed by the third protrusion and the beam to meet the stiffness and strength requirements of cantilever beams of different sizes.

[0044] In some embodiments of this application, the cantilever includes a root and a beam, the root being arc-shaped and connecting the connecting arm and the beam; the insulating sealing structure includes a seal, which is at least partially insulating and sealingly fitted between the cross arm and the edge portion.

[0045] In the above technical solution, the root is arc-shaped, resulting in a smoother transition between the cantilever and connecting arm, reducing the risk of stress concentration and improving the reliability of the cantilever, which in turn improves the reliability of the transition structure, thereby enhancing the overall reliability of the terminal post assembly. Furthermore, the arc-shaped root has a larger radius, reducing molding difficulty regardless of whether casting, bending, or riveting is used, thus improving product yield and reducing manufacturing costs. By incorporating a sealant into the insulation and sealing structure, which provides a seal between the cross arm and the edge, the problem of seal failure at the terminal post assembly location is reduced, improving the reliability of the individual battery cells.

[0046] In some embodiments of this application, the beam portion is inclined or bent relative to the root portion toward the first wall, and the included angle between the beam portion and the connecting arm is θ3, wherein θ3 < 90 degrees.

[0047] In the above technical solution, the above structure can improve the overall strength of the cantilever. Moreover, the tilting or bending direction of the cantilever is opposite to the direction in which the pole body is forced to detach from the transfer structure, and also opposite to the bending direction of the edge. This helps to increase the difficulty of bending the edge towards the side closer to the first wall and reduce the risk of the connecting arm bending away from the pole body. This can reduce the probability of the pole body being forced to detach from the transfer structure, improve the reliability of the pole component, and further improve the reliability of the insulation and sealing structure, thereby improving the reliability of the battery cell.

[0048] In some embodiments of this application, 45 degrees ≤ θ3 < 90 degrees. In this technical solution, by further narrowing the range of the included angle θ3, it is beneficial to select a more suitable included angle value more accurately to meet the included angle between the beam and the connecting arm of the pole body in most sizes, so as to meet the strength and stiffness requirements of the cantilever. This reduces the difficulty of selecting the included angle value, simplifies the manufacturing process, and thus helps to reduce the production cost of the battery cell.

[0049] In some embodiments of this application, the first wall has an outer wall surface away from the electrode component, and along the thickness direction of the first wall, the projection of the root onto the plane of the outer wall surface and the projection of the seal onto the plane of the outer wall surface at least partially overlap. In this technical solution, the above structure increases the surface area of ​​the cantilever acting on the seal, thereby allowing the seal to have a greater amount of compression between the transverse arm and the edge, enhancing the sealing performance of the seal, improving the sealing reliability between the adapter structure and the electrode body, thereby improving the reliability of the electrode component, and ultimately improving the reliability of the battery cell.

[0050] In some embodiments of this application, the height of the transverse arm is H1 along the thickness direction of the first wall, and the length of the transverse arm is L1 along the thickness direction of the connecting arm, wherein H1 and L1 satisfy the following formula: y = -(P·L1) 4 ) / 8E(b·H1 3 / 12)

[0051] Where y is the deflection of the cross arm, which should be less than 25% of the compression of the insulating sealing structure;

[0052] P represents the maximum rebound force of the insulating and sealing structure after compression, expressed in N.

[0053] E represents the elastic modulus of the crossarm, measured in GPa.

[0054] b is the circumference of the transverse arm in the circumferential direction of the pole body, in mm.

[0055] In the above technical solution, the appropriate height and length of the cross arm can be calculated by using the above formula, thereby giving the cross arm high strength and rigidity. This can reduce the probability of large deformation of the cross arm when the pole body is under stress, thereby improving the reliability of the insulation and sealing structure between the transfer structure and the pole body, reducing the risk of insulation and sealing failure, and improving the reliability of the battery cell.

[0056] In some embodiments of this application, the insulating sealing structure includes a seal and a first insulating member. The seal is insulating and sealingly fitted between the cross arm and the edge portion, and the first insulating member is insulatingly fitted between the connecting arm and the pole body, and between the cantilever and the pole body.

[0057] In the above technical solution, the first insulating component can provide insulation around the electrode body, reducing the risk of short circuits or other electrical safety accidents. Moreover, the first insulating component can also provide sealing along with the sealing component. The first insulating component serves as the first line of defense, and the sealing component serves as the second line of defense, thus providing dual protection. This reduces the probability of electrolyte seeping out from the inside of the casing components and effectively resists the intrusion of moisture and dust, thereby improving the reliability of the battery cell.

[0058] In some embodiments of this application, the seal and the first insulating element are integrally molded.

[0059] In the above technical solution, the aforementioned structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells, this improves assembly efficiency and reduces raw material waste. Since it eliminates the need to separately manufacture the sealing component and the first insulating component before connecting or assembling them, it reduces scrap materials and unnecessary processing steps, lowering manufacturing costs. The integral molding of the sealing component and the first insulating component also helps reduce potential micro-gaps or loose connections between them, minimizing the risk of sealing failures and electrolyte leakage, thus improving the reliability of the battery cell.

[0060] In some embodiments of this application, the insulating sealing structure includes a second insulating element that covers the outer peripheral side of the connecting arm and the cantilever.

[0061] In the above technical solution, the structure described above provides circumferential insulation protection on the outer side of the electrode post body, reducing the risk of electrical safety accidents such as short circuits, and stabilizing the surrounding electric field distribution, thus reducing the probability of damage to the battery cell due to uneven electric field. Secondly, the second insulating component can also form a protective layer around the connecting arm and cantilever, providing cushioning and vibration damping, thereby reducing the impact on the electrode post body, lowering the probability of damage, and improving the reliability of the battery cell.

[0062] In some embodiments of this application, the second insulating element, the first insulating element, and the sealing element are integrally molded.

[0063] In the above technical solution, the aforementioned structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells, this improves assembly efficiency and reduces raw material waste. Since it eliminates the need to separately manufacture the sealing component, the first insulating component, and the second insulating component before connecting or assembling them, it reduces scrap materials and unnecessary processing steps, lowering manufacturing costs. The integral molding of the sealing component, the first insulating component, and the second insulating component also helps eliminate potential micro-gaps or loose connections between them, reducing the risk of sealing failures and electrolyte leakage, thus improving the reliability of the battery cells.

[0064] In some embodiments of this application, the insulating sealing structure includes a third insulating member disposed on the side of the transition structure near the electrode component and sealingly fitted with the sealing member.

[0065] In the above technical solution, the third insulating component provides an effective insulation barrier on the side of the transition structure near the electrode components, isolating the electrode components from the first wall and the transition structure, reducing the risk of short circuits, and allowing current to flow along a predetermined path, thereby improving the stability and reliability of the battery cell. The third insulating component also acts as a barrier, preventing electrolyte from flowing to the terminal components, reducing the risk of electrolyte leakage, and preventing external moisture, dust, and other impurities from entering the casing components, causing internal short circuits and corrosion problems in the battery cell. In other words, the third insulating component helps maintain a clean environment inside the casing components, ensuring that the chemical reactions inside the battery cell can function normally. Furthermore, the third insulating component acts as a buffer between the first wall and the electrode components, reducing the probability of impact between the first wall and the electrode components that could damage the electrode components, thus improving the reliability of the battery cell.

[0066] In some embodiments of this application, the third insulating element and the sealing element are integrally molded parts.

[0067] In the above technical solution, the aforementioned structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells, this improves assembly efficiency and reduces raw material waste. Since it eliminates the need to separately manufacture the third insulating component and seal before connecting or assembling, it reduces scrap materials and unnecessary processing steps, lowering manufacturing costs. The integrated molding of the third insulating component and seal also helps eliminate potential micro-gaps or loose connections between them, reducing the risk of sealing failures and electrolyte leakage, thus improving the reliability of the battery cells.

[0068] In some embodiments of this application, the pole body includes a connected main body and an edge portion, the edge portion being circumferentially arranged around the main body; the side of the edge portion away from the cantilever forms a gap with the insulating sealing structure and the transition structure.

[0069] In the above technical solution, the gap can provide space for the expansion and deformation of at least part of the insulating and sealing structure, and release the gas inside the insulating and sealing structure. This can reduce the risk that at least part of the insulating and sealing structure cannot release gas or expand in time when compressed, reduce the risk of the transfer structure being damaged by compression, improve the reliability of the terminal component, and reduce the risk of released gas diffusing into the battery cell and contaminating the electrolyte. This is beneficial to ensuring the stability of the chemical reaction inside the battery cell, thereby improving the reliability of the battery cell.

[0070] In some embodiments of this application, the housing component includes a housing and a cover, the housing having an opening and the cover closing the opening; the first wall is the cover, or a wall opposite the housing and the cover. In this technical solution, by providing the first wall on the cover or the wall opposite the housing and the cover, more options are available for the placement of the terminal post component, increasing the design flexibility of the battery cell to meet different usage requirements.

[0071] Secondly, embodiments of this application provide a battery device, including any of the battery cells described above.

[0072] In the above technical solution, since the battery cell has high reliability, the reliability of the battery device using the battery cell can be improved, and the battery device can have better performance.

[0073] Thirdly, embodiments of this application provide an electrical device, including a battery cell as described above, or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0074] In the above technical solution, since the battery cell or battery device has high reliability, the reliability of the electrical device using the battery cell or battery device can be improved, and the electrical device can have better performance. Attached Figure Description

[0075] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1 is a schematic diagram of the structure of an electrical device provided in some embodiments of this application as a vehicle;

[0077] Figure 2 is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0078] Figure 3 is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0079] Figure 4 is a schematic diagram of the structure of the pole post component provided in some embodiments of this application;

[0080] Figure 5 is a partial structural schematic diagram of the pole post component provided in some embodiments of this application;

[0081] Figure 6 is a partial structural schematic diagram of the adapter structure provided in some embodiments of this application;

[0082] Figure 7 is a partial enlarged schematic diagram of the pole body provided in some embodiments of this application;

[0083] Figure 8 is a partial enlarged schematic diagram of the pole body provided in another embodiment of this application;

[0084] Figure 9 is a schematic diagram of the adapter structure provided in some embodiments of this application before riveting;

[0085] Figure 10 is an exploded view of the pole post component before assembly according to some embodiments of this application;

[0086] Figure 11 is a three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0087] Figure 12 is a partial structural schematic diagram of the pole post component provided in another embodiment of this application;

[0088] Figure 13 is a schematic diagram of the adapter structure provided in another embodiment of this application;

[0089] Figure 14 is a partial structural schematic diagram of the pole post component provided in another embodiment of this application;

[0090] Figure 15 is a schematic diagram of the adapter structure provided in another embodiment of this application;

[0091] Figure 16 is a partial structural schematic diagram of the pole post component provided in some other embodiments of this application;

[0092] Figure 17 is a partial structural schematic diagram of the pole post component provided in some other embodiments of this application;

[0093] Figure 18 is a schematic diagram of the assembly structure of a battery cell provided in some embodiments of this application;

[0094] Figure 19 is a schematic diagram of the assembly structure of a battery cell provided in some embodiments of this application.

[0095] icon:

[0096] 1000. Electrical appliances;

[0097] 100. Battery device;

[0098] 10. Box body; 11. First box body; 12. Second box body;

[0099] 20. Battery cell;

[0100] 21. Housing components;

[0101] 211. Shell; 212. Cover; 201. First wall; 201a. Mounting hole; 201b. Outer wall surface;

[0102] 22. Electrode components;

[0103] 221. Polar ear;

[0104] 23. Pole post components;

[0105] 231. Pole body;

[0106] 2311, Main body; 2311a, Exposed surface; 2312, Edge; 2313, Second protrusion; 2314, Fourth protrusion;

[0107] 232. Adapter structure;

[0108] 2321, Connecting arm; 2321a, Glue injection hole;

[0109] 2322, cantilever; 23221, root; 23222, beam;

[0110] 2323. Cross arm; 23231. First convex portion; 2323a, outer ring surface; 2323b, inner ring surface;

[0111] 2324. The third convex part;

[0112] 2301. Pre-forming section; 2302. Riveting forming section;

[0113] 233. Insulating and sealing structure;

[0114] 2331. Sealing components;

[0115] 23311, First sealing part; 23312, Second sealing part;

[0116] 2332. First insulating component; 2333. Second insulating component; 2334. Third insulating component;

[0117] 234. Clearance; 235. Compression arm;

[0118] 200, Controller; 300, Motor; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0119] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0120] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0121] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0122] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0123] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0124] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0125] In this application, "multiple" means two or more (including two).

[0126] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0127] The battery apparatus mentioned in the embodiments of this application can refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0128] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0129] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0130] A single battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0131] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode components can be of a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0132] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery pack typically consists of a casing and multiple battery cells housed within it. Among these, the battery cell, as the core component of the battery pack, has high requirements in terms of both safety and lifespan. To ensure the stability of the battery cell's internal structure, the casing needs to maintain a high degree of airtightness between itself and the external environment. Therefore, how to further improve the airtightness between the battery cell's internal structure and the external environment has become one of the problems that needs to be solved.

[0133] In a typical battery cell, terminals are mounted on the outer casing. These terminals pass through the casing and are electrically connected to the electrode components inside. To ensure the casing is sealed from the external environment, the terminals need to be sealed to the casing using a sealing element. However, in typical battery cells, the sealing element between the terminals and the casing is prone to failure, mainly due to two reasons: first, the compression of the sealing element between the terminals and the casing may be insufficient to provide a proper seal; second, the battery cell needs to be connected to other electrical components or battery cells, making the terminals susceptible to forces. For example, a common scenario is that the terminals are subjected to pull-out forces away from them. When these pull-out forces are large, they can easily damage and deform the terminals or casing, leading to sealing failure and affecting the reliability of the battery cell.

[0134] Based on the above considerations, in order to solve the problem that the seal between the terminal post and the casing is prone to failure, which affects the sealing performance of the battery cell casing and the external environment, and thus affects the reliability of the battery cell, the applicant has designed a battery cell, including: a casing component, an electrode component, and a terminal post component. The casing component includes a first wall with a mounting hole. The electrode component is housed within the casing component. The terminal post component is mounted at the mounting hole and includes a terminal post body, a connecting structure, and an insulating sealing structure. The terminal post body connects to the electrode component. The connecting structure is circumferentially arranged around the terminal post body and connected to the first wall. The insulating sealing structure is insulating and sealingly fitted between the terminal post body and the connecting structure. The connecting structure includes a connecting arm, and a cantilever and a cross arm connecting the connecting arm. The cross arm is closer to the first wall than the cantilever and has a first protrusion protruding towards the cantilever. Along the thickness direction of the first wall, the cross arm, at least at the position where the first protrusion is located, is clamped together with the cantilever at both ends of the edge portion of the terminal post body by the insulating sealing structure.

[0135] In this battery cell structure, the terminal post component is configured to include a terminal post body, a connecting structure, and an insulating sealing structure. The connecting structure serves as the first wall connecting the terminal post body and the housing component. Since the connecting structure includes a connecting arm, a cantilever, and a cross arm, these components form a groove structure. The cross arm has a first protrusion extending towards the cantilever. The connecting structure is held against the edge of the terminal post body by the insulating sealing structure. In this structure, the connecting structure, through the groove structure and the first protrusion, can form a relatively complex insulation and sealing path with the insulating sealing structure, thereby creating a larger contact surface. This enhances the insulation and sealing effect, improving the reliability of the battery cell. The first protrusion further compresses the insulating sealing structure, increasing the compression between the cross arm and the edge, making the insulating sealing structure more compact and further improving insulation and sealing performance, also contributing to improved battery cell reliability.

[0136] The battery cells and battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft, or can be used in power systems that use battery cells and battery devices disclosed in this application to form such electrical devices.

[0137] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0138] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device 1000 according to one embodiment of this application. Please refer to Figure 1, which is a structural schematic diagram of a vehicle for the electrical device 1000 provided in some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0139] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0140] Please refer to Figure 2, which is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other, and the first housing body 11 and the second housing body 12 together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; the first housing body 11 and the second housing body 12 may also be hollow structures both open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0141] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0142] Please refer to Figure 2, which is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 may include multiple rows of battery cells 20, which are arranged along the length of the housing 10. Each row of battery cells 20 may include multiple battery cells 20 arranged along the width of the housing 10; or, the multiple rows of battery cells 20 may also be arranged along the width of the housing 10, and each row of battery cells 20 may include multiple battery cells 20 arranged along the length of the housing 10.

[0143] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell 20 that can be recharged after discharge to activate the active materials and continue to be used. It can also be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited in this respect. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes. For example, in Figure 2, the battery cell 20 is cuboid.

[0144] According to some embodiments of this application, referring to Figures 3, 4, and 5, this application provides a battery cell 20, including: a housing component 21, an electrode component 22, and a terminal component 23. The housing component 21 includes a first wall 201, and the first wall 201 has a mounting hole 201a. The electrode component 22 is housed within the housing component 21. The terminal component 23 is mounted at the mounting hole 201a and includes a terminal body 231, a connecting structure 232, and an insulating sealing structure 233. The terminal body 231 is connected to the electrode component 22. The connecting structure 232 is circumferentially arranged around the terminal body 231 and connected to the first wall 201. The insulating sealing structure 233 is insulatingly and sealingly fitted between the terminal body 231 and the connecting structure 232. The adapter structure 232 includes a connecting arm 2321, a cantilever 2322 and a cross arm 2323 connecting the connecting arm 2321. The cross arm 2323 is close to the first wall 201 relative to the cantilever 2322 and has a first protrusion 23231 protruding towards the cantilever 2322. Along the thickness direction of the first wall 201, the cross arm 2323 is at least provided with the position of the first protrusion 23231 and the cantilever 2322 together clamped at both ends of the edge portion 2312 of the pole body 231 by the insulating sealing structure 233.

[0145] The housing component 21 can refer to a component that houses the electrode component 22 and the electrolyte, and protects the internal electrode component 22 and electrolyte. The housing component 21 can be made of, but is not limited to, metal or plastic. Metal materials can be, but are not limited to, steel or aluminum, and plastic materials can be, but are not limited to, polycarbonate, polypropylene, etc. The housing component 21 can be, but is not limited to, cylindrical, cuboid, flat, or other shapes.

[0146] The first wall 201 can refer to one of the multiple shell walls of the housing component 21. Exemplarily, the housing component 21 may include a peripheral wall and a top wall and a bottom wall connected to both ends of the peripheral wall, and the first wall 201 can be a peripheral wall, a top wall, or a bottom wall, etc. Referring to the preceding text, the peripheral wall can be circular, square, or other shapes, etc. For example, when the housing component 21 is cylindrical, the peripheral wall is circular; when the housing component 21 is cuboid, the peripheral wall may include multiple side walls, and the first wall 201 can be one or more of these side walls. The mounting hole 201a can refer to a hole penetrating the first wall 201. The thickness direction of the first wall 201 can be referred to as the third direction Z in Figures 3 and 4.

[0147] The explanation of electrode component 22 can be found in the previous text, and will not be repeated here.

[0148] There can be one or more electrode post components 23, some of which can serve as the positive electrode and others as the negative electrode. There can be one or more electrode post components 23 serving as the positive electrode, and there can also be one or more electrode post components 23 serving as the negative electrode.

[0149] The electrode body 231 can refer to the key component in the electrode assembly 23 that plays a role in current conduction. The shape of the electrode body 231 can be, but is not limited to, cylindrical, square, or racetrack-shaped, etc. The main body 2311 can refer to the main structural part of the electrode body 231, used for electrically connecting to the electrode assembly 22, and the edge 2312 can refer to the annular portion surrounding the main body 2311. Referring to Figure 4, in the third direction Z of Figure 4, the thickness of the edge 2312 can be less than the thickness of the main body 2311.

[0150] The electrode body 231 can be made of, but is not limited to, aluminum, copper, or copper-aluminum composite materials, and can be made of one or more materials. For example, the electrode body 231 can be made entirely of aluminum or copper. The electrode body 231 can also be made of copper-aluminum composite material. For example, referring to Figures 4 to 8, 11, and 13, the electrode body 231 has a two-layer structure, which is an integral part formed by pressing a copper plate and an aluminum plate together.

[0151] The adapter structure 232 is an annular component surrounding the periphery of the pole body 231, used to connect to the first wall 201 and fix the pole body 231 through the insulating sealing structure 233. The adapter structure 232 must include at least a connecting arm 2321, a cantilever 2322, and a cross arm 2323. These three arms, when connected, form a groove structure. The cantilever 2322 and cross arm 2323 can form two lateral groove walls of this groove structure, creating a groove opening. The connecting arm 2321 can form the bottom groove wall of this groove structure. The groove structure formed by the connecting arm 2321, cantilever 2322, and cross arm 2323 can be, but is not limited to, U-shaped, C-shaped, or conical, etc., without specific limitations. Furthermore, the material of the adapter structure 232 can be, but is not limited to, metal or plastic. Metal materials can be, but are not limited to, steel or aluminum, etc., and plastic materials can be, but are not limited to, polycarbonate, polypropylene, etc.

[0152] "First protrusion 23231" can refer to a structure that protrudes from other parts of the cross arm 2323. For ease of understanding, the first protrusion 23231 can be understood as a boss or protrusion that protrudes from the cross arm 2323.

[0153] The insulating sealing structure 233 can refer to a component that has both insulating and sealing functions, and can be, but is not limited to, a component made of plastic, rubber, etc. For example, the insulating sealing structure 233 can be a plastic ring.

[0154] In the electrode post component 23 of the above structure, since the first protrusion 23231 protrudes towards the cantilever 2322, the first protrusion 23231 can compress the portion of the insulating sealing structure 233 located between the cross arm 2323 and the edge portion 2312, increasing the compression of the insulating sealing structure 233. This allows the insulating sealing structure 233 to be compressed more tightly, and also allows a larger contact surface to be formed between the cross arm 2323 and the insulating sealing structure 233. This enhances the insulation and sealing performance of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312, reduces the risk of electrolyte leakage from the location of the electrode post component 23, and thus improves the reliability of the battery cell 20.

[0155] Referring to Figures 18 and 19, in the battery cell 20 of this embodiment, the electrode component 23 includes an electrode body 231, a connecting structure 232, and an insulating sealing structure 233. In this configuration, the electrode body 231 can first be assembled with the connecting structure 232 and the insulating sealing structure 233 to form the electrode component 23. Then, the tab 221 of the electrode component 22 is pulled out of the housing component 21, and the tab 221 is connected to the electrode body 231 (the connection method can be, but is not limited to, welding). Finally, the connecting structure 232 is installed into the mounting hole 201a of the first wall 201 on the outside of the housing component 21. The connection method between the connecting structure 232 and the first wall 201 can be, but is not limited to, welding.

[0156] In the above assembly process, since the shell component 21 is generally thin, especially with the trend of pursuing higher energy density, the thickness of the shell component 21 is gradually reduced. If the connection between the terminal body 231 and the first wall 201 is complex or the connection steps are cumbersome, it is easy to increase the probability of damage to the shell component 21, affecting the reliability of the battery cell 20. For example, when the terminal is connected to the shell by riveting, the shell wall is easily damaged during the riveting process because the shell is relatively thin, which in turn affects the reliability of the battery cell. In the above technical solution of this application, the steps of insulating, sealing and fixing the terminal body 231 can be performed before the steps of connecting it to the shell component 21. This allows the terminal body 231 to not directly contact the shell component 21, reducing the probability of damage to the shell component 21 and the terminal body 231 during installation, improving the integrity of the shell component 21, and thus improving the reliability of the battery cell 20. Moreover, as analyzed above, the above solution is also conducive to reducing the thickness of the shell component 21, which helps to reduce the weight of the battery cell 20 and increase the volumetric energy density of the battery cell 20.

[0157] The connection method between the pole body 231 and the tab 221 can be, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure fusion welding, brazing, adhesive bonding, etc. The connection method between the adapter structure 232 and the first wall 201 can be, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure fusion welding, brazing, or riveting, etc.

[0158] In the above technical solution, by configuring the electrode post component 23 to include an electrode post body 231, a connecting structure 232, and an insulating sealing structure 233, the connecting structure 232 can be used to connect the electrode post body 231 and the first wall 201 of the housing component 21. Since the connecting structure 232 includes a connecting arm 2321, a cantilever 2322, and a cross arm 2323, the connecting arm 2321, the cantilever 2322, and the cross arm 2323 can form a groove structure, and the cross arm 2323 is provided with a first protrusion 23231 protruding towards the cantilever 2322. The connecting structure 232 is clamped on the edge portion 2312 of the electrode post body 231 by the insulating sealing structure 233. In this structure, the connecting structure 232 can form a relatively complex insulation and sealing path with the insulating sealing structure 233 through the groove structure and the first protrusion 23231, thereby forming a larger contact surface, which can enhance the insulation and sealing effect and improve the reliability of the battery cell 20. The first protrusion 23231 can further compress the insulating sealing structure 233, increasing the compression of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312, making the insulating sealing structure 233 more compact, which can further improve insulation and sealing performance, and also help improve the reliability of the battery cell 20.

[0159] In some embodiments of this application, referring to Figures 4 and 5, a first protrusion 23231 is provided at the end of the cross arm 2323 away from the connecting arm 2321.

[0160] Referring to the above description, the above structure enables the insulating and sealing structure 233 to have high insulation and sealing performance between the adapter structure 232 and the pole body 231. Based on this, by adopting the above structure in the first direction X, the size of the cross arm 2323 can be made smaller, that is, the cross arm 2323 can be relatively "short". This can improve the structural compactness, reduce materials, save the volume of the adapter structure 232, and reduce the weight of the adapter structure 232.

[0161] The first protrusion 23231 of the cross arm 2323 can be formed by means including but not limited to extrusion, casting or injection molding. Since the first protrusion 23231 is located at the end of the cross arm 2323 away from the connecting arm 2321, there are fewer obstacles around the first protrusion 23231 when the transition structure 232 is manufactured, which can reduce the molding difficulty of the first protrusion 23231.

[0162] In the above technical solution, since the first protrusion 23231 is located at the end of the cross arm 2323, under the premise that the insulating sealing structure 233 has a large contact surface between the cross arm 2323 and the edge portion 2312, and has good insulation and sealing effects, it is beneficial to reduce the size of the cross arm 2323, making the structure of the transition structure 232 more compact. This reduces the weight of the transition structure 232 and helps to improve the unit volume energy density of the battery cell 20. Moreover, since the first protrusion 23231 is located at the end of the cross arm 2323, it is easier to form the first protrusion 23231 on the cross arm 2323, reducing the forming difficulty of the first protrusion 23231, improving manufacturability, and the reduction in forming difficulty also helps to improve product yield.

[0163] In some embodiments of this application, referring to FIG5, the cross arm 2323 and the first protrusion 23231 together form an outer ring surface 2323a facing the edge portion 2312; the insulating sealing structure 233 includes a sealing member 2331, the sealing member 2331 includes a first sealing portion 23311, the first sealing portion 23311 is insulating and sealingly fitted between the outer ring surface 2323a and the edge portion 2312.

[0164] The outer annular surface 2323a may refer to the annular surface of the cross arm 2323 facing the edge portion 2312 (see Figure 5).

[0165] The seal 2331 can refer to the structure or component in the insulating sealing structure 233 that performs a sealing function. The seal 2331 can be made of, but is not limited to, rubber, plastic, etc., wherein the rubber material can be, but is not limited to, nitrile rubber, etc., and the plastic material can be, but is not limited to, tetrafluoroethylene, etc. For example, the seal 2331 can be an annular component arranged circumferentially around the pole body 231, for example, the seal 2331 can be a rubber sealing ring.

[0166] The seal 2331 may consist only of the first sealing portion 23311, in which case the first sealing portion 23311 is the seal 2331. The seal 2331 may also include other structures or parts in addition to the first sealing portion 23311, in which case the first sealing portion 23311 refers to the part located between the outer annular surface 2323a and the edge portion 2312.

[0167] In the above technical solution, the first sealing part 23311 can form a large sealing surface between the cross arm 2323 and the edge part 2312, which can make the cross arm 2323 and the edge part 2312 have better sealing performance, reduce the risk of electrolyte leakage from the cross arm 2323 and the edge part 2312, thereby improving the reliability of the electrode component 23 and thus improving the reliability of the battery cell 20.

[0168] In some embodiments of this application, referring to FIG5, the cross arm 2323 and the first protrusion 23231 together form an inner annular surface 2323b surrounding the pole body 231; the seal 2331 includes a second sealing part 23312, which is insulated and sealed between the inner annular surface 2323b and the pole body 231, and connects to the first sealing part 23311.

[0169] The inner annular surface 2323b can refer to the annular surface of the transverse arm 2323 arranged circumferentially around the pole body 231.

[0170] Referring to the preceding text, the seal 2331 may include not only the first sealing portion 23311, but also a second sealing portion 23312. The second sealing portion 23312 and the first sealing portion 23311 can form an L-shaped structure. It is understood that a first sealing line can be formed between the first sealing portion 23311 and the outer annular surface 2323a, and a second sealing line can be formed between the second sealing portion 23312 and the inner annular surface 2323b. Through the coordinated cooperation of the second sealing line and the first sealing line, a larger sealing surface can be formed between the seal 2331 and the cross arm 2323, thereby improving sealing performance and reducing the risk of seal failure.

[0171] In the above technical solution, the above structure can make the combination of the seal 2331 and the cross arm 2323 more compact, improve the connection reliability of the seal 2331 and the cross arm 2323, and also increase the sealing surface between the seal 2331 and the cross arm 2323, thereby further improving the sealing performance and further improving the reliability of the pole component 23, thereby improving the reliability of the battery cell 20.

[0172] In some embodiments of this application, referring to FIG6, the height of the cross arm 2323 along the thickness direction of the first wall 201 is H1, and the protrusion height of the first protrusion 23231 is H2, wherein 0.2≤H2 / H1≤0.3.

[0173] H2 / H1 can be, but is not limited to, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, etc.

[0174] In the above technical solution, by setting the protrusion height of the first protrusion 23231 and the height of the cross arm 2323 within the aforementioned range, the protrusion height of the first protrusion 23231 can be controlled within a suitable range. This reduces the risk of the cross arm 2323 breaking due to exceeding the material's ductility limit caused by the excessive height of the first protrusion 23231. It also reduces the risk of stress concentration points appearing in the cross arm 2323 due to the excessive height of the first protrusion 23231, which could lead to deformation or damage to the cross arm 2323 structure. In other words, the above solution ensures the overall reliability of the cross arm 2323. Furthermore, by controlling the protrusion height of the first protrusion 23231 within a suitable range, the molding difficulty of the first protrusion 23231 can be reduced, its manufacturability improved, and costs reduced.

[0175] In some embodiments of this application, referring to Figures 4 and 5, the pole body 231 includes a connected main body portion 2311 and an edge portion 2312. The edge portion 2312 is circumferentially arranged around the main body portion 2311, and the edge portion 2312 is provided with a second protrusion 2313 protruding toward the cross arm 2323.

[0176] The main body 2311 may refer to the main structural part of the pole body 231 and is used to electrically connect the electrode component 22. The edge part 2312 may refer to the annular part provided around the periphery of the main body 2311. In the third direction Z of FIG5, the thickness of the edge part 2312 may be less than the thickness of the main body 2311.

[0177] The second protrusion 2313 can refer to the structure of the edge portion 2312 that protrudes relative to other parts. For ease of understanding, the second protrusion 2313 can be understood as a boss or bulge protruding from the edge portion 2312.

[0178] Since the second protrusion 2313 protrudes towards the cross arm 2323, based on the already provided first protrusion 23231, the second protrusion 2313 can further increase the compression of the insulating sealing structure 233, further compressing the insulating sealing structure 233 more tightly, and further making the insulation and sealing path formed by the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312 more complex, increasing the contact surface formed by deformation between the cross arm 2323 and the insulating sealing structure 233, thereby further enhancing the insulation and sealing performance of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312, and reducing the risk of electrolyte leakage from the location of the electrode component 23.

[0179] In the above technical solution, the second protrusion 2313 and the first protrusion 23231 cooperate to enable the insulating sealing structure 233 to have a greater compression amount, and can further increase the complexity of the insulation and sealing path of the insulating sealing structure 233, and can also increase the contact surface between the cross arm 2323 and the edge portion 2312, thereby significantly improving the insulation and sealing performance of the insulating sealing structure 233, and further improving the reliability of the battery cell 20.

[0180] In some embodiments of this application, referring to FIG5, the second protrusion 2313 and the first protrusion 23231 are staggered along the thickness direction of the connecting arm 2321.

[0181] The thickness direction of the connecting arm 2321 can be referred to the first direction X in Figure 5.

[0182] In the above technical solution, the second protrusion 2313 and the first protrusion 23231 are staggered, thereby forming a meandering insulating sealing surface between the cross arm 2323, the first protrusion 23231, the second protrusion 2313, and the edge portion 2312. This further increases the complexity of the insulation and sealing path and the contact area, while also making the insulating sealing structure 233 more compact. The insulating sealing structure 233 is less likely to detach from the groove structure formed between the cross arm 2323 and the edge portion 2312 along the thickness direction of the connecting arm 2321, thus improving the installation reliability of the insulating sealing structure 233 and consequently improving the reliability of insulation and sealing. Furthermore, this structure, while achieving high insulation and sealing performance, allows for a more compact arrangement of the cross arm 2323 and the edge portion 2312 along the thickness direction of the first wall 201. This improves the overall structural compactness of the electrode post component 23, reducing its overall volume and increasing the volumetric energy density of the battery cell 20.

[0183] In some embodiments of this application, along the thickness direction of the connecting arm 2321, the projection of the first protrusion 23231 onto the connecting arm 2321 and the projection of the second protrusion 2313 onto the connecting arm 2321 overlap.

[0184] In the above technical solution, by overlapping the projections of the first protrusion 23231 onto the connecting arm 2321 and the second protrusion 2313 onto the connecting arm 2321, the portion of the insulating sealing structure 233 located between the horizontal arm 2323 and the edge portion 2312 can be compressed to form an "S" shape. This allows the insulating sealing structure 233 to form a more complex insulation and sealing path between the horizontal arm 2323 and the edge portion 2312, and provides a larger contact surface, further improving the durability and reliability of insulation and sealing. This structure, which allows the partial compression of the insulating sealing structure 233 into an "S" shape, also further reduces the probability of the insulating sealing structure 233 detaching from between the horizontal arm 2323 and the edge portion 2312, improving the overall reliability of the terminal component 23. Furthermore, this structure further improves the structural compactness of the terminal component 23, which is beneficial for further reducing the volume of the terminal component 23, thereby increasing the unit volume energy density of the battery cell 20.

[0185] In some embodiments of this application, referring to Figures 4 and 5, the insulating sealing structure 233 includes a seal 2331, which is insulatingly and sealingly fitted between the pole body 231 and the cross arm 2323; wherein, along the thickness direction of the first wall 201, the projection of the second protrusion 2313 on the first wall 201 and the projection of the seal 2331 on the first wall 201 at least partially overlap.

[0186] It is understandable that, along the thickness direction of the first wall 201, the projection of the second protrusion 2313 on the first wall 201 may only partially overlap with the projection of the seal 2331 on the first wall 201; or, the projection of the second protrusion 2313 on the first wall 201 may be entirely within the projection of the seal 2331 on the first wall 201, without any specific restrictions.

[0187] In the above technical solution, the sealing element 2331 serves as a sealing component between the electrode body 231 and the cross arm 2323. By having the projection of the second protrusion 2313 onto the first wall 201 at least partially overlap with the projection of the sealing element 2331 onto the first wall 201, the second protrusion 2313 can compress the sealing element 2331, increasing the compression amount of the sealing element 2331. This improves the sealing performance between the electrode body 231 and the cross arm 2323, reduces the risk of electrolyte leakage, and thus improves the reliability of the electrode component 23, thereby improving the reliability of the battery cell 20.

[0188] In some embodiments of this application, the projection of the second protrusion 2313 onto the first wall 201 is entirely located within the projection of the seal 2331 onto the first wall 201.

[0189] In the above technical solution, the second protrusion 2313 has a larger contact surface with the seal 2331, exerting a greater compressive force on the seal 2331, thereby enabling the seal 2331 to have a greater compression amount and improving the sealing reliability between the terminal body 231 and the cross arm 2323. The second protrusion 2313 can also press the seal 2331 more tightly and firmly, thereby reducing the probability of the seal 2331 coming off between the terminal body 231 and the cross arm 2323, which can improve the installation reliability of the seal 2331, and also help improve the sealing reliability and the reliability of the battery cell 20.

[0190] In some embodiments of this application, referring to Figures 7 and 8, the two ends of the second protrusion 2313 are provided with transition fillets or chamfers along the thickness direction of the connecting arm 2321.

[0191] Referring to Figure 7, along the thickness direction of the connecting arm 2321, the two opposite ends of the second protrusion 2313 are provided with transition fillets.

[0192] Referring to Figure 8, chamfers may also be provided at the opposite ends of the second protrusion 2313 along the thickness direction of the connecting arm 2321.

[0193] In the above technical solution, whether the two ends of the second protrusion 2313 are provided with transition fillets or chamfers, the above structure can reduce the probability of stress concentration on the second protrusion 2313, improve the overall reliability of the edge portion 2312, reduce the probability of sharp structures on the second protrusion 2313, reduce the probability of the pole post component 23 scratching the workers during the assembly process, and improve the ease of assembly.

[0194] In some embodiments of this application, referring to Figures 4 and 5, the insulating sealing structure 233 includes a first insulating member 2332, the connecting arm 2321 and the cantilever 2322 are insulatedly connected to the pole body 231 through the first insulating member 2332, and the cantilever 2322 is provided with a third protrusion 2324 protruding toward the cross arm 2323.

[0195] The first insulating component 2332 can refer to a component that serves an insulating function, and can be, but is not limited to, a plastic component, a rubber component, or a ceramic component. The material of the plastic component can include, but is not limited to, polypropylene, polycarbonate, or polystyrene; the material of the rubber component can include, but is not limited to, nitrile rubber or silicone rubber; and the material of the ceramic component can include, but is not limited to, alumina ceramic or titanium dioxide ceramic. Optionally, the first insulating component 2332 can be an injection-molded component. Specifically, the first insulating component 2332 can be a structural component obtained by injection molding, or it can refer to a component directly injection-molded between the connecting arm 2321, the cantilever 2322, and the pole body 231.

[0196] The third protrusion 2324 can refer to the structure of the cantilever 2322 that protrudes relative to other parts. For ease of understanding, the third protrusion 2324 can refer to the boss or protrusion provided on the cantilever 2322.

[0197] In the above technical solution, the cantilever 2322 compresses the first insulating member 2332 through the third protrusion 2324, thereby providing a larger contact surface between the cantilever 2322 and the first insulating member 2332, and enabling the formation of a more complex insulation path between them. This improves the insulation and protection performance of the first insulating member 2332, enhances the insulation of the terminal post component 23, and improves the reliability of the battery cell 20. The third protrusion 2324 also presses the first insulating member 2332 firmly, strengthening its restraining and limiting effect, reducing the probability of the first insulating member 2332 detaching from the cantilever 2322 and the terminal post body 231. This improves the installation reliability and stability of the first insulating member 2332, which also contributes to improving the reliability of the battery cell 20.

[0198] In some embodiments of this application, referring to FIG6, along the thickness direction of the first wall 201, the height of the cantilever 2322 is H3, and the protrusion height of the third protrusion 2324 is H4, wherein 0.2≤H4 / H3≤0.3.

[0199] H4 / H3 can be, but is not limited to, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, etc.

[0200] In the above technical solution, by setting the protrusion height of the third protrusion 2324 and the height of the cantilever 2322 within the aforementioned range, the protrusion height of the third protrusion 2324 can be controlled within a suitable range. This reduces the risk of the cantilever 2322 breaking due to exceeding the material's ductility limit caused by the excessive height of the third protrusion 2324. It also reduces the risk of stress concentration points appearing in the cantilever 2322 due to the excessive height of the third protrusion 2324, which could lead to deformation or damage to the cantilever 2322 structure. In other words, the above solution ensures the overall reliability of the cantilever 2322. Furthermore, controlling the protrusion height of the third protrusion 2324 within a suitable range also reduces the molding difficulty of the third protrusion 2324, improves its manufacturability, and thus reduces costs.

[0201] In some embodiments of this application, referring to FIG5, the pole body 231 includes a main body portion 2311 and an edge portion 2312 connected together. The edge portion 2312 is circumferentially arranged around the main body portion 2311, and the edge portion 2312 is provided with a fourth protrusion 2314 protruding toward the cantilever 2322.

[0202] The fourth protrusion 2314 can refer to the structure of the edge portion 2312 that protrudes relative to other parts. For ease of understanding, the fourth protrusion 2314 can be understood as a boss or bulge that protrudes from the edge portion 2312.

[0203] Since the fourth protrusion 2314 protrudes towards the cantilever 2322, based on the already provided third protrusion 2324, the fourth protrusion 2314 can further increase the complexity of the insulation path formed between the first insulator 2332 and the cantilever 2322, and can further increase the compression of the first insulator 2332, making the first insulator 2332 more compact. This can further enhance the insulation of the first insulator 2332 between the cantilever 2322 and the edge portion 2312, and reduce the risk of electrolyte leakage from the electrode component 23.

[0204] In the above technical solution, the cooperation between the fourth protrusion 2314 and the third protrusion 2324 enables the first insulating member 2332 to have a greater compression amount and further increases the complexity of the insulation path between the cantilever 2322 and the edge portion 2312, thereby improving the insulation of the first insulating member 2332 and further improving the reliability of the battery cell 20.

[0205] In some embodiments of this application, referring to FIG5, the fourth protrusion 2314 and the third protrusion 2324 are staggered along the thickness direction of the connecting arm 2321.

[0206] In the above technical solution, the fourth protrusion 2314 and the third protrusion 2324 are staggered, thereby forming a meandering insulation path between the cantilever 2322, the third protrusion 2324, the fourth protrusion 2314, and the edge portion 2312. This increases the contact area and makes the first insulating member 2332 more compact, preventing it from easily detaching from the groove structure formed between the cantilever 2322 and the edge portion 2312 along the thickness direction of the connecting arm 2321. This improves the installation reliability of the first insulating member 2332, and thus improves the insulation reliability. Furthermore, this structure allows for a more compact arrangement of the cantilever 2322 and the edge portion 2312 along the thickness direction of the first wall 201 while maintaining high insulation performance. This improves the overall structural compactness of the electrode post component 23, which helps reduce the overall volume of the battery cell 20 and increase its volumetric energy density.

[0207] In some embodiments of this application, the fourth protrusion 2314 has transition fillets or chamfers at its opposite ends along the thickness direction of the connecting arm 2321.

[0208] In the above technical solution, by adopting the above structure, the probability of stress concentration on the fourth protrusion 2314 can be reduced, the overall reliability of the edge portion 2312 can be improved, the probability of sharp structure on the fourth protrusion 2314 can be reduced, the risk of the pole post component 23 scratching the workers during the assembly process can be reduced, and the ease of assembly can be improved.

[0209] In some embodiments of this application, referring to Figures 9 and 10, the transition structure 232 is an integrally formed part and includes a pre-formed part 2301 and a riveting formed part 2302. The pre-formed part 2301 is connected to the first wall 201 and includes a cross arm 2323. The riveting formed part 2302 is connected to the pre-formed part 2301 and includes a connecting arm 2321 and a cantilever 2322; and / or, the transition structure 232 and the housing component 21 are integrally formed.

[0210] The adapter structure 232 can be made of metal; for example, it can be made of aluminum. Optionally, the adapter structure 232 can be pre-stamped. The pre-formed part 2301 can refer to the part that is pre-made and will not be further processed, and the riveting part 2302 can refer to the part that needs to be riveted later. Referring to Figures 9 and 10, the insulating sealing structure 233 can include a sealing element 2331 and a first insulating element 2332. The edge part 2312 can be assembled to the cross arm 2323 through the sealing element 2331. Then, the first insulating element 2332 is assembled to the edge part 2312 and the main body part 2311. Finally, the riveting part 2302 is pressed onto the first insulating element 2332 by riveting to form the pole member 23 shown in Figure 4.

[0211] In other examples, the first insulating member 2332 may also be assembled later. For example, the riveting forming part 2302 is bent towards the edge part 2312 by riveting to form the connecting arm 2321 and the cantilever 2322. Then, the first insulating member 2332 is injection molded in the gap formed between the connecting arm 2321, the cantilever 2322 and the pole body 231.

[0212] Furthermore, in addition to the adapter structure 232 being a one-piece molded part, the adapter structure 232 can also be molded on the housing component 21, making the adapter structure 232 and the housing component 21 a single piece. Alternatively, the adapter structure 232 can be integrally molded with the housing component 21, meaning that a portion of the structure of the housing component 21 forms the adapter structure 232. For example, the first wall 201 portion of the housing component 21 can be stamped to form the adapter structure 232.

[0213] In the above technical solution, the adapter structure 232 is a one-piece molded part, and the connecting arm 2321 and cantilever 2322 are formed by riveting. This results in good overall consistency of the adapter structure 232 and fewer connection gaps, enhancing the connection strength between the adapter structure 232 and the terminal body 231, reducing the risk of loosening. Furthermore, the riveting and tightening method creates a good sealing effect, further improving the sealing performance between the adapter structure 232 and the terminal body 231, which is beneficial to improving the reliability of the adapter structure 232, and consequently, the reliability of the terminal component 23. The adapter structure 232 and the housing component 21 are integrally set, which allows the structure formed by the adapter structure 232 and the housing component 21 to have high consistency, further reducing connection gaps, enhancing the sealing effect, improving the reliability of the battery cell 20, reducing the number of parts, reducing assembly steps, and improving work efficiency.

[0214] In some embodiments of this application, referring to Figures 3 and 6, the first wall 201 has an outer wall surface 201b away from the electrode component 22. Along the thickness direction of the first wall 201, the connecting arm 2321 forms a first projection on the plane where the outer wall surface 201b is located, and the cantilever 2322 forms a second projection on the plane where the outer wall surface 201b is located. In the thickness direction of the connecting arm 2321, the size of the first projection is smaller than the size of the second projection.

[0215] The outer wall surface 201b of the first wall 201 can be referred to Figure 3.

[0216] "The plane containing the outer wall surface 201b" can refer to a plane that is coplanar with the outer wall surface 201b.

[0217] The thickness direction of the first wall 201 can be referred to the third direction Z in Figure 6. The thickness direction of the connecting arm 2321 can be referred to the first direction X in Figure 6.

[0218] "In the thickness direction of the connecting arm 2321, the size of the first projection is smaller than the size of the second projection." This can be understood because the cantilever 2322 is used to limit the insulating sealing structure 233, and to ensure that the surface of the electrode body 231 facing away from the electrode component 22 has a large area for connecting components such as the busbar component, the size of the cantilever 2322 is usually relatively small along the thickness direction of the connecting arm 2321. By making the size of the first projection smaller than the size of the second projection in the thickness direction of the connecting arm 2321, the connecting arm 2321 can be considered as an upright arm plate, thus reducing the size of the connecting arm 2321 in the first direction X. The connecting arm 2321 can be perpendicular to the outer wall surface 201b; or, the connecting arm 2321 can be approximately perpendicular to the outer wall surface 201b, that is, the angle between the connecting arm 2321 and the outer wall surface 201b is close to 90 degrees.

[0219] Secondly, when the adapter structure 232 limits the pole body 231, the cantilever 2322 is used to press a part of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323. For ease of understanding, the part of the insulating sealing structure 233 located between the edge portion 2312 and the cross arm 2323 can be the sealing element 2331. Since the connecting arm 2321 is perpendicular or approximately perpendicular to the outer wall surface 201b, the compression arm 235 formed by the adapter structure 232 on the sealing element 2331 is relatively short (see Figure 5). The compression arm 235 can refer to the line connecting the two points in Figure 5. This increases the force exerted by the connecting arm 2321 and the cantilever 2322 on the sealing element 2331, thereby increasing the compression of the sealing element 2331 and improving the sealing reliability of the sealing element 2331.

[0220] To facilitate understanding, a further example can be provided: the adapter structure 232 can be installed on the pole body 231 via the insulating sealing structure 233 through riveting, thereby forming the connecting arm 2321 and the cantilever 2322. When the riveting force is removed, because the compression arm 235 formed by the adapter structure 232 on the seal 2331 is relatively short, the reaction arm of the seal 2331's rebound on the cantilever 2322 is also relatively short. This allows the seal 2331 to maintain a large amount of compression, which helps to improve the problem of compression attenuation of the seal 2331, ensuring that the compression of the seal 2331 remains at the expected set value, thereby improving the sealing reliability of the seal 2331 between the edge portion 2312 and the cross arm 2323.

[0221] Furthermore, referring to Figures 5 and 11, since the connecting arm 2321 is perpendicular or approximately perpendicular to the outer wall surface 201b, the structure formed by the connecting arm 2321, the cantilever 2322, and the cross arm 2323 with the pole body 231 is more compact, which is beneficial to reduce the size of the transition structure 232 in the first direction X and the second direction Y, making the overall structure of the pole component 23 more compact. Since the size of the adapter structure 232 in the second direction Y is more compact, and the size of the first wall 201 in the second direction Y is the same, the size of the pole body 231 in the second direction Y of the pole component 23 of this application can be made larger. This is beneficial to increase the exposed surface 2311a of the pole body 231. When the pole body 231 is connected to the busbar or other power connection component through the exposed surface 2311a, there can be a larger connection surface (e.g., welding surface) between the exposed surface 2311a and the busbar or other power connection component. As a result, the pole body 231 can also have a larger current flow area, which can improve the charging and discharging efficiency and facilitate the realization of a higher performance narrow cell design.

[0222] In the above technical solution, the connecting arm 2321 can be a vertical arm perpendicular to or approximately perpendicular to the first wall 201. On the one hand, this can reduce the compressive force arm 235 of the transition structure 232 on the insulating sealing structure 233, enhance the compressive effect of the cantilever 2322 on the portion of the insulating sealing structure 233 located between the edge portion 2312 and the horizontal arm 2323, enhance the insulation and sealing effect, and improve the insulation and sealing reliability of the insulating sealing structure 233 between the edge portion 2312 and the horizontal arm 2323, thereby improving the overall reliability of the battery cell 20. On the other hand, the above structure can also make the structure of the transition structure 232 more compact, thereby making the overall structure of the electrode post component 23 more compact. As a result, the electrode post body 231 can have a larger exposed surface 2311a, which is beneficial to increase the current-carrying area of ​​the electrode post body 231 and improve the current-carrying capacity of the electrode post body 231.

[0223] In some embodiments of this application, referring to Figures 3 and 5, the connecting arm 2321 is perpendicular to the first wall 201.

[0224] In the above technical solution, by making the connecting arm 2321 perpendicular to the first wall 201, the compression arm 235 of the adapter structure 232 on the insulating sealing structure 233 can be smaller, which can further enhance the insulation and sealing effect of the insulating sealing structure 233 and improve the reliability of the battery cell 20. Secondly, adopting the above structure can also make the structure of the adapter structure 232 more compact, thereby further reducing the size of the adapter structure 232. Under the premise of the same size electrode component 23, the electrode body 231 has a larger exposed surface 2311a, which further improves the current carrying capacity of the electrode body 231. Furthermore, the perpendicularity of the connecting arm 2321 to the first wall 201 is easier to achieve during manufacturing, which can improve manufacturability and reduce costs.

[0225] In some embodiments of this application, referring to FIG6, the cantilever 2322 includes a root portion 23221 and a beam portion 23222, the beam portion 23222 being connected to the connecting arm 2321 via a rounded transition at the root portion 23221; the insulating sealing structure 233 includes a seal 2331, the seal 2331 being at least partially insulating and sealingly fitted between the cross arm 2323 and the edge portion 2312.

[0226] The root portion 23221 can refer to the part of the cantilever 2322 that is connected to the connecting arm 2321, and the beam portion 23222 can refer to the part of the cantilever 2322 that is close to the pole body 231. Referring to Figure 6, to easily distinguish between the root portion 23221 and the beam portion 23222, two auxiliary dashed lines are drawn on the cantilever 2322 in Figure 6. In the cantilever 2322, the part located between the two auxiliary dashed lines is the root portion 23221, and the remaining part is the beam portion 23222.

[0227] The seal 2331 can refer to the structure or component in the insulating sealing structure 233 that performs a sealing function. The seal 2331 can be made of, but is not limited to, rubber, plastic, etc., wherein the rubber material can be, but is not limited to, nitrile rubber, etc., and the plastic material can be, but is not limited to, tetrafluoroethylene, etc. For example, the seal 2331 can be an annular component arranged circumferentially around the pole body 231.

[0228] "The seal 2331 is at least partially insulated and sealingly fitted between the cross arm 2323 and the edge portion 2312" can be understood as the seal 2331 being either entirely disposed between the cross arm 2323 and the edge portion 2312 or partially disposed between the cross arm 2323 and the edge portion 2312.

[0229] In the above technical solution, by configuring the cantilever 2322 with the aforementioned structure, the beam 23222 is connected to the connecting arm 2321 via a rounded transition at the root 23221. This results in a smoother and more rounded connection between the cantilever 2322 and the connecting arm 2321, reducing the likelihood of stress concentration. Furthermore, by configuring the insulating sealing structure 233 to include a seal 2331, which provides a seal between the transverse arm 2323 and the edge portion 2312, the probability of seal failure at the location of the electrode post component 23 is reduced, thereby improving the reliability of the battery cell 20.

[0230] In some embodiments of this application, referring to FIG12, the beam portion 23222 is inclined or bent relative to the root portion 23221 toward the direction of the first wall 201.

[0231] In the above structure, the third protrusion 2324 mentioned above can be formed on the beam 23222.

[0232] The cantilever 2322 can be manufactured by tilting the beam portion 23222 relative to the root portion 23221 towards the first wall 201, for example, by casting or injection molding. Alternatively, the cantilever 2322 can be formed after the base material is formed, by further processing to bend the beam portion 23222 relative to the root portion 23221 towards the first wall 201, for example, by riveting the root portion 23221 and the beam portion 23222, or by bending the root portion 23221 and the beam portion 23222.

[0233] As analyzed above, the pole body 231 is more susceptible to forces directed away from the first wall 201, which could lead to the pole body 231 detaching from the transition structure 232 and causing the cantilever 2322 to deform. In the above structure, the beam 23222 is inclined or bent relative to the root 23221 towards the first wall 201, and the cantilever 2322 has high strength and stiffness. When the pole body 231 is subjected to a force away from the first wall 201, the inclined or bent structure of the cantilever 2322 needs to be overcome first, the cantilever 2322 needs to be straightened, and then the beam 23222 needs to be inclined relative to the root 23221 away from the first wall 201. Only in this way can the edge 2312 detach from the transition structure 232. Obviously, to complete this process, the pole body 231 needs to withstand a greater force, which is more difficult, thus reducing the risk of the pole body 231 detaching from the transition structure 232.

[0234] Secondly, since the edge portion 2312 bends towards the cantilever 2322, and the bending direction of the edge portion 2312 is opposite to the direction of the inclined or bent structure in the cantilever 2322, the pole body 231 needs to overcome the bending structure of the edge portion 2312 in order to detach from the transition structure 232. That is, the edge portion 2312 needs to be straightened and then bent towards the first wall 201. Combined with the above, the difficulty of the pole body 231 detaching from the transition structure 232 is further increased, and the probability of detachment is also lower. This makes the overall structure of the pole component 23 more stable and reliable.

[0235] In the above technical solution, the above structure can improve the overall strength of the cantilever 2322. Moreover, the tilting or bending direction of the cantilever 2322 is opposite to the direction in which the pole body 231 is dislodged from the transition structure 232 by force, and also opposite to the bending direction of the edge portion 2312. This helps to increase the difficulty of bending the edge portion 2312 towards the side closer to the first wall 201, and reduces the risk of the connecting arm 2321 bending away from the pole body 231. This can reduce the probability of the pole body 231 being dislodged from the transition structure 232 by force, improve the overall reliability of the pole component 23, and further improve the reliability of the insulation and sealing structure 233, thereby improving the reliability of the battery cell 20.

[0236] In some embodiments of this application, referring to Figures 6 and 13, the included angle between the beam 23222 and the connecting arm 2321 is θ1, wherein 85 degrees ≤ θ1 ≤ 95 degrees.

[0237] θ1 can be, but is not limited to, 85 degrees, 86 degrees, 87 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 93 degrees, 94 degrees, 95 degrees, etc. For example, referring to Figures 6 and 13, the included angle θ1 between the beam 23222 and the connecting arm 2321 is 90 degrees.

[0238] In the above technical solution, by setting the included angle θ1 between the beam 23222 and the connecting arm 2321 within the above range, an appropriate included angle value can be flexibly selected according to the size of the pole body 231, and the structural strength and stiffness of the structure formed by the beam 23222 and the connecting arm 2321 can be adjusted to meet the stiffness and strength requirements of the transition structure 232 of different sizes.

[0239] In some embodiments of this application, referring to FIG6, the beam portion 23222 is provided with a third protrusion 2324 protruding toward the cross arm 2323, and the third protrusion 2324 is inclined or bent relative to the beam portion 23222 toward the connecting arm 2321.

[0240] In the above technical solution, the above structure can increase the bending positions formed on the cantilever 2322 and increase the number of bends, thereby further improving the structural strength and stiffness of the cantilever 2322, reducing the probability that the pole body 231 will force the adapter structure 232 to deform and cause the pole body 231 to detach from the adapter structure 232, thus improving the reliability of the pole component 23, and thereby improving the overall reliability of the battery cell 20.

[0241] In some embodiments of this application, referring to FIG6, the included angle between the third protrusion 2324 and the beam 23222 is θ2, wherein 85 degrees ≤ θ2 ≤ 95 degrees.

[0242] θ2 can be, but is not limited to, 85 degrees, 86 degrees, 87 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 93 degrees, 94 degrees, 95 degrees, etc. For example, referring to Figure 6, the included angle θ2 between the third protrusion 2324 and the beam 23222 is 90 degrees.

[0243] In the above technical solution, by setting the included angle θ2 between the third protrusion 2324 and the beam 23222 within the above range, an appropriate included angle value can be flexibly selected according to the size of the pole body 231, and the structural strength and stiffness of the structure formed by the third protrusion 2324 and the beam 23222 can be adjusted to meet the stiffness and strength requirements of cantilever 2322 of different sizes.

[0244] In some embodiments of this application, referring to Figures 14 and 15, the cantilever 2322 includes a root portion 23221 and a beam portion 23222. The root portion 23221 is arc-shaped and connects the connecting arm 2321 and the beam portion 23222. The insulating sealing structure 233 includes a seal 2331, which is at least partially insulating and sealingly fitted between the cross arm 2323 and the edge portion 2312.

[0245] "The root 23221 is arc-shaped" can be understood as the root 23221 being an arc arm (see Figures 14 and 15). For ease of understanding, two auxiliary dotted lines are drawn on the cantilever 2322 in Figures 14 and 15 to distinguish it. The part between the two auxiliary dotted lines is the root 23221, and the rest is the beam 23222.

[0246] In the above technical solution, the root portion 23221 is arc-shaped, resulting in a smoother transition at the connection point between the cantilever 2322 and the connecting arm 2321, reducing the risk of stress concentration and improving the reliability of the cantilever 2322. This, in turn, improves the reliability of the transition structure 232, thereby enhancing the overall reliability of the terminal post component 23. Furthermore, the arc-shaped root portion 23221 has a larger radius, reducing molding difficulty regardless of whether casting, bending, or riveting is used, thus improving product yield and reducing manufacturing costs. By configuring the insulating sealing structure 233 to include a sealing element 2331, which provides a seal between the transverse arm 2323 and the edge portion 2312, the problem of sealing failure at the location of the terminal post component 23 is reduced, improving the reliability of the battery cell 20.

[0247] In some embodiments of this application, referring to FIG15, the beam portion 23222 is inclined or bent relative to the root portion 23221 toward the direction close to the first wall 201, and the included angle between the beam portion 23222 and the connecting arm 2321 is θ3, wherein θ3 < 90 degrees.

[0248] The cantilever 2322 can be manufactured by tilting the beam portion 23222 relative to the root portion 23221 towards the first wall 201, for example, by casting or injection molding. The cantilever 2322 can also be formed after the base body is formed, by further processing to bend the beam portion 23222 relative to the root portion 23221 towards the first wall 201, for example, by riveting the root portion 23221 and the beam portion 23222, or by bending the root portion 23221 and the beam portion 23222.

[0249] The technical effects of the inclined or bent structure of the cantilever 2322 can be referred to in the previous text, and will not be repeated here.

[0250] When the beam portion 23222 is inclined or bent relative to the root portion 23221 towards the first wall 201, the root portion 23221 may also be inclined relative to the connecting arm 2321 towards the side away from the pole body 231. Therefore, by making the included angle θ3 between the beam portion 23222 and the connecting arm 2321 less than 90 degrees, the connection position of the root portion 23221 and the connecting arm 2321 is tangent. Alternatively, the root portion 23221 may be inclined relative to the connecting arm 2321 towards the side closer to the pole body 231. As a result, when the pole body 231 is subjected to a force away from the first wall 201, the probability of the beam portion 23222 undergoing a large positional deformation relative to the connecting arm 2321 is relatively low, and the wind direction of the pole body 231 detaching from the transition structure 232 is also relatively small, which can improve the overall reliability of the pole component 23.

[0251] In the above technical solution, the above structure can improve the overall strength of the cantilever 2322. Moreover, the tilting or bending direction of the cantilever 2322 is opposite to the direction in which the pole body 231 is forced to detach from the transition structure 232, and also opposite to the bending direction of the edge portion 2312. This helps to increase the difficulty of bending the edge portion 2312 towards the side closer to the first wall 201, and reduces the risk of the connecting arm 2321 bending away from the pole body 231. This can reduce the probability of the pole body 231 being forced to detach from the transition structure 232, improve the reliability of the pole component 23, and further improve the reliability of the insulation and sealing structure 233, thereby improving the reliability of the battery cell 20.

[0252] In some embodiments of this application, 45 degrees ≤ θ3 < 90 degrees.

[0253] It is understandable that, furthermore, the included angle θ3 can be, but is not limited to, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, 88 degrees, etc.

[0254] In the above technical solution, by further narrowing the range of the included angle θ3, it is beneficial to select a more suitable included angle value more accurately to meet the included angle between the beam 23222 and the connecting arm 2321 in most sizes of the pole body 231, so as to meet the strength and stiffness requirements of the cantilever 2322. This reduces the difficulty of selecting the included angle value, simplifies the manufacturing process, and thus helps to reduce the production cost of the battery cell 20.

[0255] In some embodiments of this application, referring to Figures 3 and 5, the first wall 201 has an outer wall surface 201b away from the electrode component 22. Along the thickness direction of the first wall 201, the projection of the root 23221 onto the plane of the outer wall surface 201b and the projection of the seal 2331 onto the plane of the outer wall surface 201b at least partially overlap.

[0256] The thickness direction of the first wall 201 can be the third direction Z in Figure 3.

[0257] The plane containing the outer wall surface 201b can be referred to in the previous explanation, and will not be repeated here.

[0258] The statement that "the projection of the root portion 23221 onto the plane of the outer wall surface 201b and the projection of the seal 2331 onto the plane of the outer wall surface 201b at least partially overlap" can be understood as follows: the projection of the root portion 23221 onto the plane of the outer wall surface 201b can be entirely located within the projection of the seal 2331 onto the plane of the outer wall surface 201b, or a portion of the projection of the root portion 23221 onto the plane of the outer wall surface 201b is located within the projection of the seal 2331 onto the plane of the outer wall surface 201b. Taking the cantilever 2322, the edge portion 2312, and the crossarm 2323 arranged vertically as an example, at least a portion of the seal 2331 is located directly below the root portion 23221. It can be understood that both the beam portion 23222 and the root portion 23221 can compress the seal 2331 through the edge portion 2312, providing a larger compression surface for the seal 2331, thereby increasing the compression amount of the seal 2331.

[0259] In the above technical solution, the structure can increase the surface area of ​​the cantilever 2322 acting on the seal 2331, thereby allowing the seal 2331 to have a greater amount of compression between the cross arm 2323 and the edge portion 2312. This can enhance the sealing performance of the seal 2331, improve the sealing reliability between the adapter structure 232 and the terminal body 231, thereby improving the reliability of the terminal component 23, and ultimately improving the reliability of the battery cell 20.

[0260] In some embodiments of this application, referring to FIG6, the height of the transverse arm 2323 along the thickness direction of the first wall 201 is H1, and the length of the transverse arm 2323 along the thickness direction of the connecting arm 2321 is L1, wherein H1 and L1 satisfy the following formula: y=-(P·L1 4 ) / 8E(b·H1 3 / 12)

[0261] Where y is the deflection of the cross arm 2323, which should be less than 25% of the compression of the insulating sealing structure 233;

[0262] P represents the maximum rebound force of the insulating and sealing structure 233 after compression, in N.

[0263] E represents the elastic module quantity of the transverse arm 2323, in GPa.

[0264] b is the circumference of the transverse arm 2323 in the circumferential direction of the pole body 231, in mm.

[0265] The thickness direction of the first wall 201 can be referred to the third direction Z in Figure 7.

[0266] The thickness direction of the connecting arm 2321 can be referred to the first direction X in Figure 7.

[0267] The deflection y of the cross arm 2323 can be determined based on the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the cross arm 2323, and / or, the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the cantilever 2322. For example, referring to FIG5, the deflection y of the cross arm 2323 can be determined based on the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the cross arm 2323, wherein the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the cross arm 2323 can be 1 mm, and the deflection y of the cross arm 2323 can be less than 0.25 mm.

[0268] Among them, the part of the insulating sealing structure 233 located between the edge portion 2312 and the cross arm 2323 can be referred to as the sealing element 2331. The P value can be calculated by multiplying the pressure area of ​​the sealing element 2331 by the stress per unit area.

[0269] In the above technical solution, the height and length of the cross arm 2323 can be calculated by using the above formula, thereby giving the cross arm 2323 high strength and rigidity. This can reduce the probability of the cross arm 2323 undergoing large deformation when the pole body 231 is under stress, thereby improving the reliability of the insulation and sealing structure 233 between the transfer structure 232 and the pole body 231, reducing the risk of insulation and sealing failure, and improving the reliability of the battery cell 20.

[0270] In some embodiments of this application, referring to Figures 4, 5, 12 and 14, the insulating sealing structure 233 includes a sealing member 2331 and a first insulating member 2332. The sealing member 2331 is insulatingly and sealingly fitted between the cross arm 2323 and the edge portion 2312, and the first insulating member 2332 is insulatingly fitted between the connecting arm 2321 and the pole body 231, as well as between the cantilever 2322 and the pole body 231.

[0271] The explanation of seal 2331 and first insulating element 2332 can be found in the previous text, and will not be repeated here.

[0272] In the above technical solution, the first insulating component 2332 can play an insulating role around the electrode body 231, reducing the risk of short circuit or other electrical safety accidents. Moreover, the first insulating component 2332 can also play a sealing role together with the sealing component 2331. The first insulating component 2332 serves as the first sealing defense line, and the sealing component 2331 serves as the second sealing defense line, thereby playing a dual protection role, reducing the probability of electrolyte seeping out from the inside of the casing component 21, and effectively resisting the intrusion of moisture and dust, thereby improving the reliability of the battery cell 20.

[0273] In some embodiments of this application, the seal 2331 and the first insulating member 2332 are integrally formed.

[0274] In the above technical solution, the above structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells 20, it can improve assembly efficiency and reduce raw material waste. Since it is not necessary to manufacture the sealing component 2331 and the first insulating component 2332 separately and then connect or assemble them, it reduces scrap materials and unnecessary processing steps in the production process, thereby reducing manufacturing costs. The integral molding of the sealing component 2331 and the first insulating component 2332 also helps to reduce the problem of possible small gaps or loose connections between the sealing component 2331 and the first insulating component 2332, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, thus improving the reliability of the battery cell 20.

[0275] In some embodiments of this application, referring to Figures 16 and 17, the insulating sealing structure 233 includes a second insulating member 2333, which covers the outer peripheral side of the connecting arm 2321 and the cantilever 2322.

[0276] The explanation of the second insulating component 2333 can be found in the explanation of the first insulating component 2332, and will not be repeated here.

[0277] During the assembly and use of the battery cell 20, the terminal body 231 may come into accidental contact with surrounding metal parts (such as the housing part 21, the terminals of other battery cells 20, or conductive connection parts in the battery pack). Without insulation protection, a short circuit can easily occur. Therefore, as a key component for current to enter and exit the battery cell 20, the terminal body 231 can provide an effective insulation barrier by providing a second insulating element 2333 on the outer peripheral side of the connecting arm 2321 and the cantilever 2322, thereby reducing the probability of a short circuit.

[0278] In a high-voltage battery cell, an uneven electric field may cause partial discharge, which can damage the battery's performance and lifespan. By covering the outer periphery of the connecting arm 2321 and the cantilever 2322 with the second insulating element 2333, a uniform insulating environment can be formed around the electrode body 231, which helps to stabilize the electric field distribution around the electrode body 231.

[0279] During the transportation, installation and use of the battery cell 20, the terminal body 231 may be subjected to various external impacts, such as collisions, vibrations, etc. The second insulating component 2333 can play a buffering role on the outer periphery of the adapter structure 232, absorb some of the external forces, reduce the direct impact on the terminal body 231, and help ensure the integrity and conductivity of the terminal body 231.

[0280] In the above technical solution, the structure described above can provide insulation protection on the outer circumference of the electrode body 231, reducing the risk of electrical safety accidents such as short circuits, and stabilizing the surrounding electric field distribution, thus reducing the probability of damage to the battery cell 20 due to uneven electric field. Secondly, the second insulating component 2333 can also form a protective layer on the periphery of the connecting arm 2321 and the cantilever 2322, which can act as a buffer and vibration damping layer, thereby reducing the impact on the electrode body 231, lowering the probability of damage to the electrode body 231, and thus improving the reliability of the battery cell 20.

[0281] In some embodiments of this application, referring to FIG16, the first insulating component 2332 is injection molded between the connecting arm 2321, the cantilever 2322, and the pole body 231, and the second insulating component 2333 is injection molded on the outer peripheral side of the connecting arm 2321 and the cantilever 2322. That is, the first insulating component 2332 and the second insulating component 2333 can be obtained by two encapsulation molding processes. This allows for the filling of microscopic gaps formed on the surface or inside during the first encapsulation molding process due to mold precision, material shrinkage, etc., by the second encapsulation molding process, thereby further improving the insulation performance. Moreover, by injection molding the second insulating component 2333 and the first insulating component 2332 separately, the molding difficulty and manufacturing cost can be reduced.

[0282] In some embodiments of this application, referring to FIG17, the second insulating member 2333 and the first insulating member 2332 are integrally molded parts. It can be understood that the second insulating member 2333 and the first insulating member 2332 are molded in one piece with adhesive coating, which can reduce assembly steps and improve work efficiency, while the sealing member 2331 can be assembled separately, which can improve the flexibility of use of the sealing member 2331 and facilitate the replacement of the sealing member 2331 later.

[0283] In some embodiments of this application, referring to FIG17, the connecting arm 2321 is provided with a glue injection hole 2321a, and a portion of the second insulating member 2333 passes through the glue injection hole 2321a and connects to the first insulating member 2332. It can be understood that when the second insulating member 2333 and the first insulating member 2332 are integrally injection molded, the injection molding liquid can form the second insulating member 2333 on the outer peripheral side of the connecting arm 2321 and the cantilever 2322, while a portion enters from between the cantilever 2322 and the main body 2311, and between the connecting arm 2321 and the edge portion 2312, and another portion directly enters from the glue injection hole 2321a, thereby forming the first insulating member 2332. This method can increase the flow rate of the injection molding liquid, thereby improving molding efficiency and saving time.

[0284] In some embodiments of this application, the second insulating member 2333, the first insulating member 2332, and the sealing member 2331 are integrally formed parts.

[0285] In the above technical solution, the above structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells 20, it can improve assembly efficiency and reduce waste of raw materials. Since it is not necessary to manufacture the sealing component 2331, the first insulating component 2332, and the second insulating component 2333 separately and then connect or assemble them, it reduces scrap materials and unnecessary processing steps in the production process, thereby reducing manufacturing costs. The integral molding of the sealing component 2331, the first insulating component 2332, and the second insulating component 2333 also helps to eliminate the problem of possible small gaps or loose connections between the sealing component 2331, the first insulating component 2332, and the second insulating component 2333, which can reduce the risk of failure such as poor sealing, reduce the probability of electrolyte leakage, and improve the reliability of the battery cell 20.

[0286] In some embodiments of this application, referring to Figures 3, 4, 12, 14, 16 and 17, the insulating sealing structure 233 includes a third insulating member 2334, which is disposed on the side of the transition structure 232 near the electrode component 22 and is sealed to fit with the sealing member 2331.

[0287] The explanation of the third insulating member 2334 can be found in the explanation of the first insulating member 2332 mentioned above. For example, the third insulating member 2334 can be a plastic part. The third insulating member 2334 can be tightly attached to the inner peripheral wall surface of the housing component 21.

[0288] In the above technical solution, the third insulating component 2334 provides an effective insulating barrier on the side of the transition structure 232 near the electrode component 22, isolating the electrode component 22 from the first wall 201 and the transition structure 232, reducing the risk of short circuits, and allowing current to flow along a predetermined path, thereby improving the stability and reliability of the battery cell 20. The third insulating component 2334 also acts as a barrier, preventing electrolyte from flowing to the terminal component 23, reducing the risk of electrolyte leakage, and preventing external moisture, dust, and other impurities from entering the housing component 21, causing internal short circuits and corrosion in the battery cell 20. In other words, the third insulating component 2334 helps maintain a clean environment inside the housing component 21, ensuring the normal operation of the chemical reactions inside the battery cell 20. The third insulating component 2334 also acts as a buffer between the first wall 201 and the electrode component 22, reducing the probability of impact between them and damage to the electrode component 22, thus improving the reliability of the battery cell 20.

[0289] In some embodiments of this application, the third insulating element 2334 and the sealing element 2331 are integrally formed.

[0290] In the above technical solution, the above structure reduces assembly steps and simplifies the assembly process. For large-scale production of battery cells 20, it can improve assembly efficiency and reduce raw material waste. Since it is not necessary to manufacture the third insulating component 2334 and the sealing component 2331 separately and then connect or assemble them, it reduces scrap materials and unnecessary processing steps in the production process, thereby reducing manufacturing costs. The integrated molding of the third insulating component 2334 and the sealing component 2331 also helps to eliminate the problem of possible small gaps or loose connections between the third insulating component 2334 and the sealing component 2331, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, thus improving the reliability of the battery cell 20.

[0291] In some embodiments of this application, referring to FIG14, the pole body 231 includes a connected main body portion 2311 and an edge portion 2312, the edge portion 2312 being arranged circumferentially around the main body portion 2311; the side of the edge portion 2312 facing away from the cantilever 2322 forms a gap 234 with the insulating sealing structure 233 and the transition structure 232.

[0292] The gap 234 can refer to a space with a certain size.

[0293] For example, the insulating sealing structure 233 may include a plurality of seals 2331, which may be evenly disposed between the cross arm 2323 and the edge portion 2312, and a gap 234 may be formed between at least two adjacent seals 2331.

[0294] For example, referring to FIG14, the insulating sealing structure 233 may also include a seal 2331 and a first insulating member 2332. The seal 2331 is disposed between the cross arm 2323 and the edge portion 2312, the first insulating member 2332 is disposed between the connecting arm 2321 and the edge portion 2312, and / or, the first insulating member 2332 is disposed between the cantilever 2322 and the edge portion 2312, and a gap 234 is formed between the first insulating member 2332 and the seal 2331.

[0295] In the above technical solution, the gap 234 can provide space for at least part of the insulation and sealing structure 233 to expand and deform, and store gas inside the insulation and sealing structure 233. This can reduce the risk that at least part of the insulation and sealing structure 233 cannot release gas or expand in time when compressed, reduce the risk of the transfer structure 232 being damaged by compression, improve the reliability of the terminal component 23, and reduce the risk of released gas diffusing into the battery cell 20 and contaminating the electrolyte. This is beneficial to ensuring the stability of the chemical reaction inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0296] In some embodiments of this application, referring to FIG3, the housing component 21 includes a housing 211 and a cover 212, the housing 211 having an opening and the cover 212 closing the opening; the first wall 201 is the cover 212, or a wall opposite to the housing 211 and the cover 212.

[0297] The housing 211 can refer to the main structure of the housing component 21, and its openings allow the electrode component 22 and electrolyte to enter and exit the housing component 21. The cover 212 can refer to a plate-like structural component, which together with the housing 211 forms the housing component 21.

[0298] The first wall 201 can refer to the cover 212 or a shell wall of the shell 211, and is the shell wall opposite to the cover 212. Optionally, the shape of the shell 211 can be, but is not limited to, a square shell, a cylindrical shell, etc.

[0299] In the above technical solution, by setting the first wall 201 on the wall opposite to the cover 212 or the housing 211, more options can be provided for the setting position of the pole component 23, which can increase the design flexibility of the battery cell 20 to meet different usage requirements.

[0300] This application provides a battery device 100, including a battery cell 20 as described in any of the preceding embodiments.

[0301] In the above technical solution, since the battery cell 20 has high reliability, the reliability of the battery device 100 using the battery cell 20 can be improved, so that the battery device 100 can have better performance.

[0302] This application provides an electrical device 1000, including a battery cell 20 as described in any of the preceding embodiments, or a battery device 100 as described above, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0303] In the above technical solution, since the battery cell 20 or battery device 100 can have high reliability, the reliability of the electrical device 1000 using the battery cell 20 or battery device 100 can be improved, and the electrical device 1000 can have better performance.

[0304] Referring to Figures 3 to 6, a battery cell 20 provided according to an embodiment of this application includes a housing component 21, an electrode component 22, and a terminal component 23.

[0305] The housing component 21 includes a housing 211 and a cover 212. The housing 211 has an opening, and the cover 212 closes the opening. The walls of the housing 211 and the cover 212 opposite to each other form a first wall 201, and the first wall 201 is provided with a mounting hole 201a.

[0306] The electrode component 22 is housed within the housing component 21.

[0307] The electrode component 23 is installed at the mounting hole 201a and includes an electrode body 231, a transition structure 232 and an insulating sealing structure 233. The electrode body 231 is connected to the electrode component 22, and the transition structure 232 is arranged circumferentially around the electrode body 231.

[0308] The transition structure 232 is welded to the first wall 201 and includes a connecting arm 2321, and cantilever 2322 and cross arm 2323 connected to both ends of the connecting arm 2321, with the cantilever 2322 being farther away from the first wall 201 relative to the cross arm 2323. The connecting arm 2321 is perpendicular to the first wall 201, and the cantilever 2322 includes a root portion 23221 and a beam portion 23222, with the beam portion 23222 being connected to the connecting arm 2321 through a rounded transition at the root portion 23221. The cross arm 2323 has a first protrusion 23231 protruding towards the cantilever 2322, and the beam portion 23222 has a third protrusion 2324 protruding towards the cross arm 2323.

[0309] The pole body 231 includes a main body portion 2311 and an edge portion 2312 connected to each other. The edge portion 2312 is circumferentially arranged around the main body portion 2311. The edge portion 2312 has a second protrusion 2313 protruding toward the cross arm 2323 and a fourth protrusion 2314 protruding toward the cantilever arm 2322. Along the thickness direction of the connecting arm 2321, the second protrusion 2313 and the first protrusion 23231 are staggered, and the fourth protrusion 2314 and the third protrusion 2324 are staggered.

[0310] The insulating sealing structure 233 includes a sealing element 2331, a first insulating element 2332, and a second insulating element 2333. The sealing element 2331 is a sealing ring with an L-shaped cross section, and the first insulating element 2332 and the second insulating element 2333 are both injection molded parts.

[0311] Along the thickness direction of the first wall 201, the cantilever 2322 and the cross arm 2323 form clamping grooves. The cross arm 2323 is clamped onto the edge portion 2312 by the seal 2331, and the first protrusion 23231 and the second protrusion 2313 are clamped onto opposite sides of the seal 2331. The connecting arm 2321 and the cantilever 2322 are clamped onto the edge portion 2312, and the fourth protrusion 2314 and the third protrusion 2324 are clamped onto opposite sides of the first insulating member 2332. The second insulating member 2333 wraps around the outer peripheral surfaces of the connecting arm 2321 and the cantilever 2322.

[0312] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The above are merely preferred embodiments of this application and are not intended to limit the application. For those skilled in the art, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

A type of battery cell, wherein, include: The housing component includes a first wall, the first wall being provided with mounting holes; The electrode components are housed within the housing components; An electrode component is installed at the mounting hole and includes an electrode body, a connecting structure, and an insulating sealing structure. The electrode body is connected to the electrode component. The connecting structure is circumferentially arranged around the electrode body and connected to the first wall. The insulating sealing structure is insulating and sealingly fitted between the electrode body and the connecting structure. The adapter structure includes a connecting arm, a cantilever and a cross arm connecting the connecting arm. The cross arm is close to the first wall relative to the cantilever and has a first protrusion protruding towards the cantilever. Along the thickness direction of the first wall, the cross arm is clamped together with the cantilever at both ends of the edge of the pole body by the insulating sealing structure at least at the position where the first protrusion is located. According to claim 1, the battery cell, wherein, The first protrusion is located at the end of the cross arm away from the connecting arm. According to claim 2, the battery cell, wherein, The cross arm and the first protrusion together form an outer annular surface facing the edge portion; the insulating sealing structure includes a seal, the seal includes a first sealing portion, the first sealing portion being insulating and sealingly fitted between the outer annular surface and the edge portion. According to claim 3, the battery cell, wherein, The cross arm and the first protrusion together form an inner annular surface surrounding the pole body; the seal includes a second sealing part, which is insulated and sealably fitted between the inner annular surface and the pole body, and connects to the first sealing part. The battery cell according to any one of claims 2 to 4, wherein, Along the thickness direction of the first wall, the height of the cross arm is H1, and the protrusion height of the first protrusion is H2, wherein 0.2≤H2 / H1≤0.

3. The battery cell according to any one of claims 1 to 5, wherein, The pole body includes a connected main body and an edge portion, the edge portion is arranged circumferentially around the main body, and the edge portion is provided with a second protrusion protruding toward the cross arm. According to claim 6, the battery cell, wherein, Along the thickness direction of the connecting arm, the second protrusion and the first protrusion are staggered. According to claim 7, the battery cell, wherein, Along the thickness direction of the connecting arm, the projections of the first protrusion and the second protrusion on the connecting arm overlap. The battery cell according to any one of claims 6 to 8, wherein, The insulating and sealing structure includes a sealing element that is insulating and sealingly fitted between the pole body and the cross arm; Wherein, along the thickness direction of the first wall, the projection of the second protrusion onto the first wall and the projection of the seal onto the first wall at least partially overlap. According to claim 9, the battery cell, wherein, The projection of the second protrusion onto the first wall is entirely within the projection of the seal onto the first wall. The battery cell according to any one of claims 6 to 10, wherein, Along the thickness direction of the connecting arm, the two opposite ends of the second protrusion are provided with transition fillets or chamfers. The battery cell according to any one of claims 1 to 11, wherein, The insulating sealing structure includes a first insulating element, the connecting arm and the cantilever are insulatedly connected to the pole body through the first insulating element, and the cantilever is provided with a third protrusion protruding toward the cross arm. According to claim 12, the battery cell, wherein, Along the thickness direction of the first wall, the height of the cantilever is H3, and the protrusion height of the third protrusion is H4, wherein 0.2≤H4 / H3≤0.

3. According to claim 12, the battery cell, wherein, The pole body includes a connected main body and an edge portion, the edge portion is circumferentially arranged around the main body, and the edge portion is provided with a fourth protrusion protruding toward the cantilever. According to claim 14, the battery cell, wherein, Along the thickness direction of the connecting arm, the fourth protrusion and the third protrusion are staggered. The battery cell according to claim 14 or 15, wherein, Along the thickness direction of the connecting arm, the opposite ends of the fourth protrusion are provided with transition fillets or chamfers. The battery cell according to any one of claims 1 to 16, wherein, The adapter structure is an integrally molded part, and includes a pre-formed part and a riveting part. The pre-formed part is connected to the first wall and includes the cross arm. The riveting part is connected to the pre-formed part and includes the connecting arm and the cantilever. And / or, The adapter structure is integrally formed with the housing component. The battery cell according to any one of claims 1 to 17, wherein, The first wall has an outer wall surface away from the electrode component. Along the thickness direction of the first wall, the connecting arm forms a first projection on the plane where the outer wall surface is located, and the cantilever forms a second projection on the plane where the outer wall surface is located. In the thickness direction of the connecting arm, the size of the first projection is smaller than the size of the second projection. The battery cell according to any one of claims 1 to 18, wherein, The connecting arm is perpendicular to the first wall. The battery cell according to any one of claims 1 to 19, wherein, The cantilever includes a root and a beam, the beam being connected to the connecting arm via a rounded transition at the root; the insulating sealing structure includes a seal, the seal being at least partially insulating and sealingly fitted between the cross arm and the edge portion. According to claim 20, the battery cell, wherein, The beam portion is inclined or bent relative to the root portion towards the first wall. According to claim 21, the battery cell, wherein, The included angle between the beam and the connecting arm is θ1, where 85 degrees ≤ θ1 ≤ 95 degrees. The battery cell according to claim 21 or 22, wherein, The beam portion is provided with a third protrusion that protrudes toward the cross arm, and the third protrusion is inclined or bent relative to the beam portion toward the connecting arm. According to claim 23, the battery cell, wherein, The included angle between the third protrusion and the beam is θ2, where 85 degrees ≤ θ2 ≤ 95 degrees. The battery cell according to any one of claims 1 to 19, wherein, The cantilever includes a root and a beam, the root being arc-shaped and connecting the connecting arm and the beam; the insulating sealing structure includes a seal, the seal being at least partially insulating and sealingly fitted between the cross arm and the edge portion. According to claim 25, the battery cell, wherein, The beam portion is inclined or bent relative to the root portion towards the first wall, and the included angle between the beam portion and the connecting arm is θ3, where θ3 < 90 degrees. According to claim 26, the battery cell, wherein, 45 degrees ≤ θ3 < 90 degrees. The battery cell according to any one of claims 20 to 27, wherein, The first wall has an outer wall surface away from the electrode component, and along the thickness direction of the first wall, the projection of the root onto the plane of the outer wall surface and the projection of the seal onto the plane of the outer wall surface at least partially overlap. The battery cell according to any one of claims 1 to 28, wherein, Along the thickness direction of the first wall, the height of the cross arm is H1, and along the thickness direction of the connecting arm, the length of the cross arm is L1, wherein H1 and L1 satisfy the following formula: y=-(P·L1 4 ) / 8E(b·H1 3 / 12) Wherein, y is the deflection of the cross arm, which should be less than 25% of the compression of the insulating sealing structure; P is the maximum rebound force of the insulating and sealing structure after compression, in N; E represents the elastic modulus of the cross arm, in GPa. b is the circumference of the transverse arm in the circumferential direction of the pole body, in mm. The battery cell according to any one of claims 1 to 29, wherein, The insulating sealing structure includes a seal and a first insulating element. The seal is insulating and sealingly fitted between the cross arm and the edge portion. The first insulating element is insulatingly fitted between the connecting arm and the pole body, and between the cantilever and the pole body. According to claim 30, the battery cell, wherein, The sealing element and the first insulating element are integrally molded parts. According to claim 31, the battery cell, wherein, The insulating sealing structure includes a second insulating element that covers the outer peripheral surfaces of the connecting arm and the cantilever. According to claim 32, the battery cell, wherein, The second insulating component, the first insulating component, and the sealing component are integrally molded. The battery cell according to any one of claims 30 to 33, wherein, The insulating sealing structure includes a third insulating element, which is disposed on the side of the adapter structure near the electrode component and is sealed to fit with the sealing element. According to claim 34, the battery cell, wherein, The third insulating component and the sealing component are integrally molded. The battery cell according to any one of claims 1 to 35, wherein, The pole body includes a connected main body and an edge portion, the edge portion being circumferentially arranged around the main body; the side of the edge portion facing away from the cantilever forms a gap with the insulating sealing structure and the transition structure. The battery cell according to any one of claims 1 to 36, wherein, The housing component includes a housing and a cover, the housing having an opening and the cover closing the opening; the first wall is the cover, or a wall of the housing opposite to the cover. A battery device, wherein, Includes the battery cell as described in any one of claims 1 to 37. An electrical device, wherein, Includes a battery cell as described in any one of claims 1 to 37, or a battery device as described in claim 38, wherein the battery cell or the battery device is used to store or provide electrical energy.

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