Battery cell, battery device and electric device

Abstract

The utility model relates to the field of batteries, and discloses a single battery, a battery device and a power utilization device, the single battery comprises a shell part, a first connecting part and a second connecting part, an electrode member housed in the case member; the pole component is mounted at the mounting hole and comprises a pole body, a switching structure and an insulation sealing structure, the pole body is connected with the electrode component, the switching structure is annularly arranged in the circumferential direction of the pole body and connected with the first wall, and the insulation sealing structure is insulated and hermetically matched between the pole body and the switching structure; the switching structure comprises a connecting arm, a cantilever and a cross arm, the cantilever and the cross arm are connected with the connecting arm, the cross arm is close to the first wall relative to the cantilever and is provided with a first convex part protruding towards the cantilever, and in the thickness direction of the first wall, the position, at least provided with the first convex part, of the cross arm and the cantilever are jointly clamped at the two ends of the edge part of the pole body through the insulation sealing structure. According to the utility model, the insulation sealing structure can be connected between the pole body and the switching structure more tightly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric device. Background Art

[0002] A battery device generally consists of a box and multiple battery cells contained in the box. As the core component of the battery device, the battery cell has high requirements in terms of safety and service life. To ensure the stability of the battery cell, the outer shell of the battery cell and the external environment need to have a high degree of sealing. Therefore, how to further improve the sealing of the battery cell and the external environment has become one of the problems that need to be solved. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery device and an electrical device, which can effectively improve the reliability of the battery cell and the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, comprising a first wall, the first wall being provided with a mounting hole; an electrode component, housed in the shell component; a pole component, installed at the mounting hole, and comprising a pole body, a transition structure and an insulating sealing structure, the pole body being connected to the electrode component, the transition structure being arranged around the circumference of the pole body and connected to the first wall, and the insulating sealing structure being insulated and sealed between the pole body and the transition structure; wherein the transition structure comprises a connecting arm, and a cantilever and a cross arm connecting the connecting arm, the cross arm being close to the first wall relative to the cantilever, and being provided with a first protrusion protruding toward the cantilever, and along the thickness direction of the first wall, the cross arm is at least provided with a position where the first protrusion is clamped together with the cantilever at the two ends of the edge of the pole body through the insulating sealing structure.

[0005] In the above technical solution, by setting the pole part to include the pole body, the transition structure and the insulating sealing structure, the transition structure can be used to connect the pole body and the first wall of the shell part. Since the transition structure includes a connecting arm, a cantilever and a cross arm, the connecting arm, the cantilever and the cross arm can form a groove structure, and the cross arm is provided with a first convex portion protruding toward the cantilever, the transition structure is clamped on the edge of the pole body through the insulating sealing structure. In this structure, the transition structure can form a more complex insulation and sealing path with the insulating sealing structure through the groove structure and the first convex portion, and thus form a larger contact surface, thereby enhancing the insulation and sealing effect, which is conducive to improving the reliability of the battery cell. The first convex portion can also further squeeze the insulating sealing structure, increase the compression amount of the insulating sealing structure between the cross arm and the edge portion, so that the insulating sealing structure is pressed more tightly, which can further improve the insulation and sealing properties, and is also conducive to improving the reliability of the battery cell.

[0006] In some embodiments of the present application, the first protrusion is provided at an end of the cross arm away from the connecting arm.

[0007] In the above technical solution, since the first protrusion is arranged at the end of the cross arm, it is beneficial to reduce the size of the cross arm and make the structure of the switching structure more compact, while satisfying the insulation and sealing structure having a large contact surface between the cross arm and the edge, and having a good insulation and sealing effect, thereby reducing the weight of the switching structure and improving the unit volume energy density of the battery cell. Moreover, since the first protrusion is arranged at the end of the cross arm, it is also relatively easy to form the first protrusion on the cross arm, reducing the difficulty of forming the first protrusion and improving manufacturability. The reduction in the difficulty of forming is also beneficial to improving the product yield.

[0008] In some embodiments of the present application, 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, and the first sealing portion is insulated and sealed between the outer annular surface and the edge portion. With the above structure, the first sealing portion can form a larger sealing surface between the cross arm and the edge portion, so that the cross arm and the edge portion have better sealing, reduce the risk of electrolyte leakage from between the cross arm and the edge portion, thereby improving the reliability of the pole component, and then improving the reliability of the battery cell.

[0009] In some embodiments of the present application, the cross arm and the first protrusion together form an inner annular surface surrounding the pole body; the seal includes a second sealing portion, which is insulated and sealed between the inner annular surface and the pole body and connected to the first sealing portion. The above structure can make the combination of the seal and the cross arm more compact, improve the connection reliability of the seal and the cross arm, and also increase the sealing surface of the seal and the cross arm, thereby further improving the sealing performance and the reliability of the pole component, thereby improving the reliability of the battery cell.

[0010] In some embodiments of the present application, along the thickness direction of the first wall, the height of the cross arm is H1, and the protruding height of the first protrusion is H2, wherein 0.2≤H2 / H1≤0.3.

[0011] In the above technical solution, by setting the protruding height of the first protrusion and the height of the cross arm within the above range, the protruding height of the first protrusion can be controlled within an appropriate range, reducing the risk of the cross arm breaking through the material ductility limit due to the large height of the first protrusion, and reducing the risk of stress concentration positions on the cross arm due to the large height of the first protrusion, thereby causing the cross arm structure to deform or be damaged. In other words, the above solution can ensure the reliability of the cross arm as a whole. Secondly, by controlling the protruding height of the first protrusion within an appropriate range, the molding difficulty of the first protrusion can also be reduced, the manufacturability of the first protrusion can be improved, and the cost can be reduced.

[0012] In some embodiments of the present application, the pole body includes a main body portion and an edge portion which are connected to each other. The edge portion is arranged around the circumference of the main body portion, and the edge portion is provided with a second protrusion protruding toward the cross arm.

[0013] In the above technical solution, the cooperation between the second protrusion and the first protrusion can make the insulating sealing structure have a larger compression amount, and can further increase the complexity of the insulation and sealing path of the insulating sealing structure, and can also increase the contact surface between the cross arm and the edge portion, thereby significantly improving the insulation and sealing of the insulating sealing structure, and further improving the reliability of the battery cell.

[0014] In some embodiments of the present application, the second protrusion and the first protrusion are staggered along the thickness direction of the connecting arm.

[0015] In the above technical solution, the second protrusion and the first protrusion are staggered, so that the insulating sealing structure can form a winding insulating sealing surface between the cross arm, the first protrusion, the second protrusion and the edge portion. On the one hand, the complexity of the insulation and sealing path is further increased, and the area of ​​the contact surface can be increased. On the other hand, the insulating sealing structure can be pressed more tightly, and the insulating sealing structure is not easy to separate from the groove structure formed between the cross arm and the edge portion along the thickness direction of the connecting arm, which can improve the installation reliability of the insulating sealing structure, and then improve the reliability of insulation and sealing. The above structure can also make the arrangement of the cross arm and the edge portion along the thickness direction of the first wall more compact on the basis of meeting a higher insulation and sealing effect, thereby improving the overall structural compactness of the pole component, which is conducive to reducing the overall volume of the pole component and improving the unit volume energy density of the battery cell.

[0016] In some embodiments of the present application, along the thickness direction of the connecting arm, a projection of the first protrusion on the connecting arm and a projection of the second protrusion on the connecting arm partially overlap.

[0017] In the above technical solution, the projection of the first protrusion on the connecting arm and the projection of the second protrusion on the connecting arm partially overlap, so that the portion of the insulating sealing structure located between the cross arm and the edge portion 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 portion, and has a larger contact surface, which can further improve the durability and reliability of insulation and sealing. The above structure allows the insulating sealing structure to be partially compressed to form an "S"-shaped structure, and can also further reduce the probability of the insulating sealing structure escaping from between the cross arm and the edge portion, thereby improving the overall reliability of the pole component. The use of the above structure can also further improve the structural compactness of the pole component, which is conducive to further reducing the volume of the pole component, thereby improving the energy density per unit volume of the battery cell.

[0018] In some embodiments of the present application, the insulating sealing structure includes a seal that is insulated 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.

[0019] In the above technical solution, the seal is a component that performs a sealing function between the pole body and the cross arm. The projection of the second protrusion on the first wall and the projection of the seal on the first wall at least partially overlap, so that the second protrusion can play a role of compressing the seal, thereby increasing the compression amount of the seal, improving the sealing between the pole body and the cross arm, reducing the risk of electrolyte leakage, and further improving the reliability of the pole component, thereby improving the reliability of the battery cell.

[0020] In some embodiments of the present application, the projection of the second protrusion on the first wall is entirely within the projection of the seal on the first wall. In the above technical solution, the second protrusion can have a larger contact surface with the seal, and has a greater compressive force on the seal, thereby enabling the seal to have a greater compression amount, thereby improving the sealing reliability between the pole body and the cross arm. The second protrusion can also press the seal more tightly and firmly, thereby reducing the probability of the seal coming out from between the pole body and the cross arm, which can improve the installation reliability of the seal, and is also conducive to improving the sealing reliability and the reliability of the battery cell.

[0021] In some embodiments of the present application, transition fillets or chamfers are provided at opposite ends of the second protrusion along the thickness direction of the connecting arm. In this technical solution, whether transition fillets or chamfers are provided at opposite ends of the second protrusion, the above structure can reduce the probability of stress concentration on the second protrusion, improve the overall reliability of the edge, and reduce the probability of sharp structures on the second protrusion, which can reduce the probability of scratching workers during the assembly process of the pole component and improve the convenience of assembly.

[0022] In some embodiments of the present application, the insulating sealing structure includes a first insulating member, the connecting arm and the cantilever are insulated and connected to the pole body through the first insulating member, and the cantilever is provided with a third protrusion protruding toward the cross arm.

[0023] In the above technical solution, the cantilever squeezes the first insulating member through the third protrusion, thereby having a larger contact surface between the cantilever and the first insulating member, and forming a relatively complex insulation path between the first insulating member and the cantilever, thereby improving the insulation protection performance of the first insulating member, improving the insulation of the pole component, and improving the reliability of the battery cell. The third protrusion can also compress the first insulating member, enhance the restraining and limiting effect on the first insulating member, reduce the probability of the first insulating member coming out from between the cantilever and the pole body, and improve the installation reliability and firmness of the first insulating member, which is also conducive to improving the reliability of the battery cell.

[0024] In some embodiments of the present application, along the thickness direction of the first wall, the height of the cantilever is H3, and the protruding height of the third protrusion is H4, wherein 0.2≤H4 / H3≤0.3.

[0025] In the above technical solution, by setting the protruding height of the third protrusion and the height of the cantilever within the above range, the protruding height of the third protrusion can be controlled within an appropriate range, reducing the risk of the cantilever breaking through the material ductility limit due to the large height of the third protrusion, and reducing the risk of the cantilever structure being deformed or damaged due to the stress concentration position of the cantilever due to the large height of the third protrusion. In other words, the above solution can ensure the reliability of the cantilever as a whole. Secondly, by controlling the protruding height of the third protrusion within an appropriate range, the molding difficulty of the third protrusion can also be reduced, the manufacturability of the third protrusion can be improved, and the cost can be reduced.

[0026] In some embodiments of the present application, the pole body includes a main body portion and an edge portion which are connected to each other. The edge portion is arranged around the circumference of the main body portion, and the edge portion is provided with a fourth protrusion protruding toward the cantilever.

[0027] In the above technical solution, the fourth protrusion and the third protrusion cooperate with each other to make the first insulating member have a larger compression amount and further increase the complexity of the insulating path between the cantilever and the edge portion, thereby improving the insulation of the first insulating member and further improving the reliability of the battery cell.

[0028] In some embodiments of the present application, the fourth protrusion and the third protrusion are staggered along the thickness direction of the connecting arm.

[0029] In the above technical solution, the fourth protrusion and the third protrusion are staggered, so that the first insulating member can form a winding insulating path between the cantilever, the third protrusion, the fourth protrusion and the edge portion, which can increase the area of ​​the contact surface on the one hand, and on the other hand, can press the first insulating member more tightly, and it is not easy to escape from the groove structure formed between the cantilever and the edge portion along the thickness direction of the connecting arm, which can improve the installation reliability of the first insulating member, and then improve the insulation reliability. The above structure can also make the arrangement of the cantilever and the edge portion along the thickness direction of the first wall more compact on the basis of meeting a higher insulation effect, thereby improving the overall structural compactness of the pole component, which is conducive to reducing the overall volume of the battery cell and improving the volume energy density of the battery cell.

[0030] In some embodiments of the present application, transition fillets or chamfers are provided at opposite ends of the fourth protrusion 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 reliability of the edge portion as a whole can be improved, and the probability of sharp structures on the fourth protrusion can be reduced, the risk of scratching workers during the assembly process of the pole component can be reduced, and the convenience of assembly can be improved.

[0031] In some embodiments of the present application, the transition structure is an integrally formed part and includes a preformed part and a riveted formed part, the preformed part is connected to the first wall and includes a cross arm, the riveted formed part is connected to the preformed part and includes a connecting arm and a cantilever; and / or, the transition structure is integrally arranged with the shell component.

[0032] In the above technical solution, the transition structure is an integrally formed part, and the connecting arm and the cantilever are formed by riveting, so that the overall consistency of the transition structure is relatively good, and the connection gap is also small, which can enhance the connection strength between the transition structure and the pole body and reduce the risk of loosening. In addition, the riveting and pressing method can also form a good sealing effect, further improve the sealing between the transition structure and the pole body, which is conducive to improving the reliability of the transition structure, and then improve the reliability of the pole component. The transition structure and the shell component are set as one piece, so that the structure formed by the transition structure and the shell component has a high consistency, and can further reduce the connection gap, enhance the sealing effect, improve the reliability of the battery cell, and can also reduce the number of parts, reduce assembly steps, and improve work efficiency.

[0033] In some embodiments of the present application, the first wall has an outer wall surface away from the electrode component, and 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, and in the thickness direction of the connecting arm, the size of the first projection is smaller than the size of the second projection.

[0034] In the above technical solution, the connecting arm can be a vertical arm perpendicular to or substantially perpendicular to the first wall, which can reduce the compressive force arm of the transition structure on the insulating sealing structure, enhance the compressive effect of the cantilever on the portion of the insulating sealing structure between the edge and the cross arm, enhance the insulation and sealing effect, and help improve the insulation and sealing reliability of the insulating sealing structure between the edge and the cross arm, and improve the overall reliability of the battery cell. On the other hand, the above structure can also make the transition structure more compact, thereby making the overall structure of the pole part more compact, so that the pole body can have a larger exposed surface, which is conducive to increasing the flow area of ​​the pole body and improving the current carrying capacity of the pole body.

[0035] In some embodiments of the present 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 insulating sealing structure of the adapter structure can be smaller, which can further enhance the insulation and sealing effect of the insulating sealing structure and improve the reliability of the battery cell. Secondly, the above structure can also make the structure of the adapter structure more compact, thereby further reducing the size of the adapter structure. Under the premise of the same size of the pole component, the pole body has a larger exposed surface, further improving the current carrying capacity of the pole body. Secondly, the connecting arm being perpendicular to the first wall can be easier to achieve during manufacturing, which can improve manufacturability and reduce costs.

[0036] In some embodiments of the present application, the cantilever includes a root and a beam portion, and the beam portion is connected to the connecting arm through a rounded transition of the root; the insulating sealing structure includes a seal, which is at least partially insulated and sealed between the cross arm and the edge portion.

[0037] In the above technical solution, by setting the cantilever into the above structure, the beam part is connected to the connecting arm through the root part with the rounded corner transition, so that the connection position of the cantilever and the connecting arm is relatively rounded and smooth, which can reduce the probability of stress concentration. By setting the insulating sealing structure to include a seal, the seal can play a sealing role between the cross arm and the edge part, reducing the probability of sealing failure at the location of the pole component, and improving the reliability of the battery cell.

[0038] In some embodiments of the present application, the beam portion is inclined or bent relative to the root portion toward the first wall.

[0039] In the above technical solution, the use of the above structure can improve the overall strength of the cantilever, and the inclination or bending direction of the cantilever is opposite to the direction in which the pole body is forced to separate from the adapter structure, and is also opposite to the bending direction of the edge portion, which is conducive to increasing the difficulty of bending the edge portion toward the side close to the first wall and reducing the risk of bending the connecting arm toward the side away from the pole body. This can reduce the probability of the pole body being forced to separate from the adapter structure, improve the overall reliability of the pole component, and then improve the reliability of the insulating sealing structure, thereby improving the reliability of the battery cell.

[0040] In some embodiments of the present application, the angle between the beam and the connecting arm is θ1, wherein 85 degrees ≤ θ1 ≤ 95 degrees. In this technical solution, by setting the angle θ1 between the beam and the connecting arm within the above range, a suitable angle value can be flexibly selected according to the size of the pole body, and the structural strength and stiffness of the structure formed by the beam and the connecting arm can be adjusted to meet the stiffness and strength requirements of transition structures of different sizes.

[0041] In some embodiments of the present application, the beam portion is provided with a third protrusion protruding toward the cross arm, and the third protrusion is inclined or bent relative to the beam portion in a direction close to the connecting arm. In this technical solution, the above structure can increase the bending position formed on the cantilever and increase the number of bendings, thereby further improving the structural strength and rigidity of the cantilever, reducing the probability of the pole body forcing the transition structure to deform and causing the pole body to fall out of the transition structure, which can improve the reliability of the pole component and thus improve the reliability of the battery cell as a whole.

[0042] In some embodiments of the present application, the angle between the third protrusion and the beam is θ2, wherein 85 degrees ≤ θ2 ≤ 95 degrees. In this technical solution, by setting the angle θ2 between the third protrusion and the beam within the above range, a suitable angle value can be flexibly selected according to the size of the pole body, and the structural strength and stiffness of the structure formed by the third protrusion and the beam can be adjusted to meet the stiffness and strength requirements of cantilevers of different sizes.

[0043] In some embodiments of the present application, the cantilever includes a root and a beam, the root is arc-shaped and connects the connecting arm and the beam; the insulating sealing structure includes a seal, which is at least partially insulated and sealed between the cross arm and the edge.

[0044] In the above technical solution, the root is in an arc shape, so that the transition between the cantilever and the connecting arm is more rounded and smooth, and the risk of stress concentration is smaller, which can improve the reliability of the cantilever, and then improve the reliability of the transition structure, thereby improving the overall reliability of the pole component. Moreover, the arc-shaped root has a larger fillet, which can reduce the difficulty of forming whether it is cast, bent or riveted, which can improve the product yield and reduce manufacturing costs. By configuring the insulating sealing structure to include a seal, the seal can play a sealing role between the cross arm and the edge portion, reducing the problem of sealing failure at the location of the pole component, and improving the reliability of the battery cell.

[0045] In some embodiments of the present application, the beam portion is inclined or bent relative to the root portion toward the first wall, and the angle between the beam portion and the connecting arm is θ3, where θ3<90 degrees.

[0046] In the above technical solution, the use of the above structure can improve the overall strength of the cantilever, and the inclination or bending direction of the cantilever is opposite to the direction in which the pole body is forced to separate from the adapter structure, and is also opposite to the bending direction of the edge portion, which is conducive to increasing the difficulty of bending the edge portion toward the side close to the first wall and reducing the risk of bending the connecting arm toward the side away from the pole body. This can reduce the probability of the pole body being forced to separate from the adapter structure, improve the reliability of the pole component, and then improve the reliability of the insulating sealing structure, thereby improving the reliability of the battery cell.

[0047] In some embodiments of the present application, 45 degrees ≤ θ3 < 90 degrees. In this technical solution, by further narrowing the range of the angle θ3, it is helpful to more accurately select a more suitable angle value to meet the 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, thereby reducing the difficulty of selecting the angle value, simplifying the manufacturing process, and further helping to reduce the production cost of the battery cell.

[0048] In some embodiments of the present 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 on the plane where the outer wall surface is located and the projection of the seal on the plane where the outer wall surface is located at least partially overlap. In this technical solution, the above structure can increase the action surface of the cantilever on the seal, so that the seal can have a greater compression amount between the cross arm and the edge portion, which can enhance the sealing of the seal, improve the sealing reliability between the transition structure and the pole body, thereby improving the reliability of the pole component, and ultimately improve the reliability of the battery cell.

[0049] In some embodiments of the present application, 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:

[0050] y=-(P·L1 4 ) / 8E(b·H1 3 / 12)

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

[0052] P is the maximum rebound force of the insulating sealing structure after compression, in N;

[0053] E is the elastic module of the cross arm, in GPa;

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

[0055] In the above technical solution, by adopting the above formula, a more suitable height and length of the cross arm can be calculated, so that the cross arm has higher strength and rigidity, which can reduce the probability of large deformation of the cross arm when the pole body is subjected to force, thereby improving the reliability of the insulating sealing structure between the transition 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 the present application, the insulating sealing structure includes a seal and a first insulating member, the seal is insulated and sealingly fitted between the cross arm and the edge portion, and the first insulating member is insulated and 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 member can play an insulating role around the pole body, reducing the risk of short circuit or other electrical safety accidents, and the first insulating member can also play a sealing role together with the sealing member. The first insulating member serves as the first sealing line of defense, and the sealing member serves as the second sealing line of defense, thereby playing a double protection role, reducing the probability of electrolyte leakage from the inside of the shell component, and effectively resisting the intrusion of moisture and dust, thereby improving the reliability of the battery cell.

[0058] In some embodiments of the present application, the sealing member and the first insulating member are integrally formed.

[0059] In the above technical solution, the above structure can reduce the number of assembly steps and simplify the assembly process. For large-scale production of battery cells, it can improve assembly efficiency and reduce the waste of raw materials. Since there is no need to manufacture the seal and the first insulating member separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The seal and the first insulating member are integrally formed, which is also conducive to reducing the problem of small gaps or loose connections between the seal and the first insulating member, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, which is conducive to improving the reliability of the battery cell.

[0060] In some embodiments of the present application, the insulating sealing structure includes a second insulating member, and the second insulating member is coated on the outer peripheral side surfaces of the connecting arm and the cantilever.

[0061] In the above technical solution, the above structure can play an insulating protection role in the outer circumferential direction of the pole body, reduce the risk of electrical safety accidents such as short circuits, stabilize the surrounding electric field distribution, and reduce the probability of damage to the battery cell due to uneven electric field. Secondly, the second insulating member can also form a protective layer on the circumference of the connecting arm and the cantilever, which can play a buffering and vibration reduction role, thereby reducing the impact on the pole body and reducing the probability of damage to the pole body, thereby improving the reliability of the battery cell.

[0062] In some embodiments of the present application, the second insulating member, the first insulating member and the sealing member are integrally formed.

[0063] In the above technical solution, the above structure can reduce the number of assembly steps and simplify the assembly process. For large-scale production of battery cells, it can improve assembly efficiency and reduce the waste of raw materials. Since there is no need to manufacture the seal, the first insulating member and the second insulating member separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The seal, the first insulating member and the second insulating member are integrally formed, which is also conducive to eliminating the problem of small gaps or loose connections that may exist between the seal, the first insulating member and the second insulating member, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, which is conducive to improving the reliability of the battery cell.

[0064] In some embodiments of the present application, the insulating sealing structure includes a third insulating member, which is disposed on a side of the transition structure close to the electrode component and is sealed with the sealing member.

[0065] In the above technical solution, the third insulating member can provide an effective insulating barrier on the side of the transition structure close to the electrode component, isolate the electrode component from the first wall and the transition structure, reduce the risk of short circuit, and allow the current to flow along a predetermined path, which can improve the stability and reliability of the battery cell. The third insulating member can also play a blocking role. On the one hand, it can block the electrolyte from flowing to the pole component, reducing the risk of electrolyte leakage, and can also block external moisture, dust and other impurities from entering the shell component, causing internal short circuits, corrosion and other problems in the battery cell. In other words, the third insulating member is conducive to maintaining a clean environment inside the shell component, which can ensure that the chemical reaction inside the battery cell can work normally. The third insulating member can also play a buffering role between the first wall and the electrode component, reducing the impact between the first wall and the electrode component, which may cause damage to the electrode component, and improve the reliability of the battery cell.

[0066] In some embodiments of the present application, the third insulating member and the sealing member are integrally formed.

[0067] In the above technical solution, the above structure can reduce the number of assembly steps and simplify the assembly process. For large-scale production of battery cells, it can improve assembly efficiency and reduce the waste of raw materials. Since there is no need to manufacture the third insulating member and the sealing member separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The third insulating member and the sealing member are integrally formed, which is also conducive to eliminating the problem of tiny gaps or loose connections that may exist between the third insulating member and the sealing member, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, which is conducive to improving the reliability of the battery cell.

[0068] In some embodiments of the present application, the pole body includes a main body portion and an edge portion connected to each other, wherein the edge portion is circumferentially arranged around the main body portion; a gap is formed between the side of the edge portion away from the cantilever and the insulating sealing structure and the transition structure.

[0069] In the above technical solution, the gap can provide the space required for at least part of the structure of the insulating sealing structure to expand and deform, release the gas inside the insulating sealing structure, etc., which can reduce the risk that at least part of the structure of the insulating sealing structure cannot be deflated or expanded in time when compressed, reduce the risk of the transition structure being damaged by squeezing, improve the reliability of the pole components, and reduce the risk of the released gas diffusing into the battery cell and contaminating the electrolyte, which is beneficial to ensure the stability of the chemical reaction inside the battery cell, thereby improving the reliability of the battery cell.

[0070] In some embodiments of the present application, the housing component includes a housing and a cover, the housing has an opening, and the cover closes the opening; the first wall is the cover, or is a wall opposite to the housing and the cover. In this technical solution, by arranging the first wall on the cover or the wall opposite to the housing and the cover, more options can be provided for the location of the pole component, which can increase the design flexibility of the battery cell to meet different usage requirements.

[0071] In a second aspect, an embodiment of the present application provides a battery device, comprising any battery cell as described above.

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

[0073] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell as described in any one of the foregoing, or a battery device as described in the foregoing, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0074] In the above technical solution, since the battery cell or battery device has a higher reliability, the reliability of the electrical device using the battery cell or battery device can be improved, and the electrical device can have a better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0076] Figure 1A schematic diagram of a structure in which the electric device provided in some embodiments of the present application is a vehicle;

[0077] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

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

[0079] Figure 4 A schematic diagram of the structure of a pole component provided in some embodiments of the present application;

[0080] Figure 5 A schematic diagram of a partial structure of a pole component provided in some embodiments of the present application;

[0081] Figure 6 A schematic diagram of a local structure of a transfer structure provided in some embodiments of the present application Figure 1 ;

[0082] Figure 7 An enlarged schematic diagram of a local structure of a pole body provided in some embodiments of the present application;

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

[0084] Fig. 9 A schematic diagram of the structure of the transfer structure provided in some embodiments of the present application before riveting;

[0085] Fig.10 An exploded view of a pole component before assembly provided in some embodiments of the present application;

[0086] Fig.11 A schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application;

[0087] Fig.12 A schematic diagram of a partial structure of a pole component provided in another embodiment of the present application;

[0088] Fig.13 A schematic diagram of a switching structure provided in another embodiment of the present application;

[0089] Fig.14 A schematic diagram of a partial structure of a pole component provided in yet another embodiment of the present application;

[0090] Fig.15 A schematic diagram of a switching structure provided in another embodiment of the present application;

[0091] Fig.16 Schematic diagram of the partial structure of the pole component provided in some other embodiments of the present application Figure 1 ;

[0092] Fig.17 Schematic diagram of the partial structure of the pole component provided in some other embodiments of the present application Figure 2 ;

[0093] Fig.18 Schematic diagram of the assembly structure of the battery cell provided in some embodiments of the present application Figure 1 ;

[0094] Fig.19 Schematic diagram of the assembly structure of the battery cell provided in some embodiments of the present application Figure 2 .

[0095] icon:

[0096] 1000. Electrical devices;

[0097] 100. Battery device;

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

[0099] 20. Battery cells;

[0100] 21. Shell parts;

[0101] 211, housing; 212, cover; 201, first wall; 201a, mounting hole; 201b, outer wall surface;

[0102] 22. Electrode parts;

[0103] 221, ear;

[0104] 23. Pole components;

[0105] 231. Pole body;

[0106] 2311, main body; 2311a, exposed surface; 2312, edge; 2313, second convex portion; 2314, fourth convex portion;

[0107] 232. Transfer 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, preforming unit; 2302, riveting forming unit;

[0113] 233. Insulation sealing structure;

[0114] 2331, seals;

[0115] 23311, first sealing part; 23312, second sealing part;

[0116] 2332, a first insulating member; 2333, a second insulating member; 2334, a third insulating member;

[0117] 234, gap; 235, compression arm;

[0118] 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0119] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

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

[0122] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0123] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0124] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0125] The term “plurality” used in this application refers to two or more (including two).

[0126] In the present application, battery cells 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., which are not limited in the embodiments of the present application. Battery cells may be cylindrical, flat, rectangular or other shapes, which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0127] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may refer to one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging multiple battery cells.

[0128] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0129] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the housing. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the housing by fixing the battery module in the housing. As an example, the battery cell assembly may also be accommodated in the housing by directly fixing a plurality of battery cells to the housing. The housing may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0130] The battery cell includes a shell, an electrode component and an electrolyte, and the shell is used to contain the electrode component and the electrolyte. The electrode component is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0131] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode component may be a winding structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0132] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. A battery device is generally composed of a box and multiple battery cells contained in the box. Among them, the battery cell, as the core component of the battery device, has high requirements in terms of safety and service life. In order to ensure the stability of the battery cell, the outer shell of the battery cell and the external environment need to ensure a high degree of sealing. Therefore, how to further improve the sealing of the battery cell inside and the external environment has become one of the current problems that need to be solved.

[0133] In a general battery cell, a pole is provided on the outer shell, and the pole passes through the outer shell and is electrically connected to the electrode component inside the outer shell. In order to ensure the sealing between the outer shell and the external environment, the pole needs to be sealed with the outer shell through a seal. However, in a general battery cell, the seal between the pole and the outer shell is prone to the risk of sealing failure. There are mainly two reasons. First, the compression amount of the seal between the pole and the outer shell is insufficient and cannot fully play a sealing role. Second, the battery cell needs to be connected to other electrical components or battery cells, and the pole is more susceptible to the force. For example, the pole is more commonly subjected to a pulling force away from the pole. When the pulling force is large, it is easy to cause damage and deformation of the pole or the outer shell, thereby causing sealing failure of the seal, affecting the reliability of the battery cell.

[0134] Based on the above considerations, in order to solve the problem that the sealing failure between the pole and the shell is easy to occur, which affects the sealing of the shell of the battery cell and the external environment, and thus affects the reliability of the battery cell. The applicant has designed a battery cell, including: a shell component, an electrode component and a pole component, the shell component includes a first wall, and the first wall is provided with a mounting hole; the electrode component is accommodated in the shell component; the pole component is installed at the mounting hole, and includes a pole body, a transition structure and an insulating sealing structure, the pole body is connected to the electrode component, the transition structure is arranged around the circumference of the pole body and connected to the first wall, and the insulating sealing structure is insulated and sealed between the pole body and the transition structure; wherein the transition structure includes a connecting arm, and a cantilever and a cross arm connecting the connecting arm, the cross arm is close to the first wall relative to the cantilever, and is provided with a first protrusion protruding toward the cantilever, along the thickness direction of the first wall, the position where the first protrusion is at least set on the cross arm is clamped at both ends of the edge of the pole body together with the cantilever through the insulating sealing structure.

[0135] In a battery cell of this structure, by setting the pole part to include a pole body, a transition structure and an insulating sealing structure, the transition structure can be used to connect the pole body and the first wall of the shell part. Since the transition structure includes a connecting arm, a cantilever and a cross arm, the connecting arm, the cantilever and the cross arm can form a groove structure, and the cross arm is provided with a first convex portion protruding toward the cantilever, the transition structure is clamped on the edge of the pole body through the insulating sealing structure. In this structure, the transition structure can form a more complex insulation and sealing path with the insulating sealing structure through the groove structure and the first convex portion, and thus form a larger contact surface, thereby enhancing the insulation and sealing effect, which is conducive to improving the reliability of the battery cell. The first convex portion can also further squeeze the insulating sealing structure, increase the compression amount of the insulating sealing structure between the cross arm and the edge portion, so that the insulating sealing structure is pressed more tightly, which can further improve the insulation and sealing properties, and is also conducive to improving the reliability of the battery cell.

[0136] The battery cells and battery devices disclosed in the embodiments of the present application may be used in, but are not limited to, electrical devices such as vehicles, ships, or aircraft, and may also be a power supply system that uses the battery cells, battery devices, etc. disclosed in the present application to form the electrical device.

[0137] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0138] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electric device 1000 of an embodiment of the present application. Figure 1 , Figure 1 The power device 1000 provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0139] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a 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 , Figure 2 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0141] In the battery device 100, multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

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

[0143] Each battery cell 20 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 20 that can be continuously used by activating the active material by charging after the battery cell is discharged; it may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes. For example, in Figure 2 In the figure, the battery cell 20 is in the shape of a rectangular parallelepiped.

[0144] According to some embodiments of the present application, referring to Figure 3 , Figure 4 and Figure 5 The embodiment of the present application provides a battery cell 20, including: a shell component 21, an electrode component 22 and a pole component 23. The shell component 21 includes a first wall 201, and the first wall 201 is provided with a mounting hole 201a. The electrode component 22 is accommodated in the shell component 21. The pole component 23 is installed at the mounting hole 201a, and includes a pole body 231, a transition structure 232 and an insulating sealing structure 233. The pole body 231 is connected to the electrode component 22, the transition structure 232 is arranged around the circumference of the pole body 231, and is connected to the first wall 201, and the insulating sealing structure 233 is insulated and sealed between the pole body 231 and the transition structure 232. Among them, the transition structure 232 includes a connecting arm 2321, and 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 is provided with a first protrusion 23231 protruding toward the cantilever 2322. Along the thickness direction of the first wall 201, the cross arm 2323 is at least provided with a position of the first protrusion 23231, and is clamped together with the cantilever 2322 at the two ends of the edge portion 2312 of the pole body 231 through the insulating sealing structure 233.

[0145] The shell component 21 may refer to a component that contains the electrode component 22 and the electrolyte and protects the electrode component 22 and the electrolyte inside. The shell component 21 may be made of, but not limited to, metal or plastic. The metal material may be, but not limited to, steel or aluminum, etc. The plastic material may be, but not limited to, polycarbonate, polypropylene, etc. The shell component 21 may be, but not limited to, a cylinder, a cuboid, a flat body, or other shapes.

[0146] The first wall 201 may refer to one of the multiple shell walls of the shell component 21. Exemplarily, the shell component 21 may include a peripheral wall and a top wall and a bottom wall connected at both ends of the peripheral wall, and the first wall 201 may be a peripheral wall, a top wall or a bottom wall, etc. Referring to the foregoing, the peripheral wall may be circular, square or other shapes, etc. For example, when the shell component 21 is in the shape of a cylinder, the peripheral wall is circular; when the shell component 21 is in the shape of a cuboid, the peripheral wall may include multiple side walls, and the first wall 201 may be one or more of the multiple side walls. Among them, the mounting hole 201a may refer to a hole that passes through the first wall 201. The thickness direction of the first wall 201 can refer to Figure 3 and Figure 4 The third direction Z.

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

[0148] There can be one or more pole parts 23, a part of which can be used as positive poles, and another part of which can be used as negative poles. There can be one or more pole parts 23 used as positive poles, and there can also be one or more pole parts 23 used as negative poles.

[0149] The pole body 231 may refer to a key component in the pole component 23 that plays a role in current conduction. The shape of the pole body 231 may be, but is not limited to, cylindrical, square, or racetrack-shaped. The main body 2311 may refer to the main structural part of the pole body 231, which is used to electrically connect the electrode component 22, and the edge 2312 may refer to an annular part arranged around the circumference of the main body 2311. Figure 4 ,exist Figure 4 In the third direction Z, the thickness of the edge portion 2312 may be smaller than the thickness of the main body portion 2311 .

[0150] The material of the pole body 231 may be, but is not limited to, aluminum, copper, or a copper-aluminum composite material, and the pole body 231 may be made of one or more materials. For example, the pole body 231 is made entirely of aluminum or copper. The pole body 231 may also be made of a copper-aluminum composite material, for example, Figures 4 to 8 , Fig.11 and Fig.13 The pole body 231 is a two-layer structure, which is an integrated piece formed by pressing a copper plate and an aluminum plate.

[0151] The transfer structure 232 is an annular component arranged around the circumference of the pole body 231, which is used to connect the first wall 201 and fix the pole body 231 through the insulating sealing structure 233. The transfer structure 232 at least 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 are connected to form a slot structure. The cantilever 2322 and the cross arm 2323 can form two lateral slot walls of the slot structure and form a notch, and the connecting arm 2321 can form the bottom slot wall of the slot structure. Among them, the slot structure formed by the connecting arm 2321, the cantilever 2322 and the cross arm 2323 can be but not limited to U-shaped, C-shaped or conical, etc., and no specific restrictions are made here. Secondly, the material of the transfer structure 232 can be but not limited to metal or plastic, etc., the metal material can be but not limited to steel or aluminum, etc., and the plastic material can be but not limited to polycarbonate, polypropylene, etc.

[0152] The “first protrusion 23231 ” may refer to a structure in the cross arm 2323 that protrudes relative to other parts. For ease of understanding, the first protrusion 23231 may be understood as a boss or convex bump protruding from the cross arm 2323 .

[0153] The insulating sealing structure 233 may refer to a component having insulating and sealing functions, and may be, but not limited to, a plastic material component, a rubber material component, etc. For example, the insulating sealing structure 233 may be a plastic ring.

[0154] In the pole component 23 of the above structure, since the first protrusion 23231 protrudes toward the cantilever 2322, the first protrusion 23231 can squeeze the portion of the insulating sealing structure 233 located between the cross arm 2323 and the edge portion 2312, thereby increasing the compression amount of the insulating sealing structure 233. This can, on the one hand, make the insulating sealing structure 233 more compactly compressed, and on the other hand, form a larger contact surface between the cross arm 2323 and the insulating sealing structure 233, thereby enhancing the insulation and sealing properties of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312, reducing the risk of electrolyte leakage from the position of the pole component 23, and thereby improving the reliability of the battery cell 20.

[0155] Reference Fig.18 and Fig.19In the battery cell 20 of the embodiment of the present application, the pole component 23 includes a pole body 231, a transfer structure 232 and an insulating sealing structure 233. With this solution, the pole body 231 can be first assembled with the transfer structure 232 and the insulating sealing structure 233 to form the pole component 23, and then the pole ear 221 of the electrode component 22 is pulled out of the shell component 21, and the pole ear 221 is connected to the pole body 231 (the connection method can be but not limited to welding, etc.), and finally, the transfer structure 232 is installed in the installation hole 201a of the first wall 201 on the outside of the shell component 21. The connection method between the transfer structure 232 and the first wall 201 can be but not limited to welding, etc.

[0156] In the above assembly process, since the thickness of the shell part 21 is generally thin, especially in the trend of pursuing higher energy density, the thickness of the shell part 21 is gradually reduced. If the connection between the pole body 231 and the first wall 201 is relatively complicated or the connection steps are relatively cumbersome, it is easy to increase the probability of damage to the shell part 21, affecting the reliability of the battery cell 20. For example, when the pole is connected to the shell by riveting, since the shell is relatively thin, the shell wall of the shell is easily damaged during the riveting process, thereby affecting the reliability of the battery cell. In the above technical solution of the present application, the steps of insulation, sealing and fixing of the pole body 231 can be performed before the step of connecting with the shell part 21. In this way, the pole body 231 does not directly contact the shell part 21, reduces the probability of damage to the shell part 21 and the pole body 231 during the installation process, improves the integrity of the shell part 21, and is conducive to 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 part 21, which is conducive to reducing the weight of the battery cell 20 and improving the volume energy density of the battery cell 20.

[0157] The connection method of the pole body 231 and the pole ear 221 may be, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure fusion welding, brazing, bonding, etc. The connection method of the transition structure 232 and the first wall 201 may 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 pole part 23 to include a pole body 231, a transition structure 232 and an insulating sealing structure 233, the transition structure 232 can be used to connect the pole body 231 and the first wall 201 of the shell part 21. Since the transition 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 toward the cantilever 2322. The transition structure 232 is clamped on the edge portion 2312 of the pole body 231 through the insulating sealing structure 233. In this structure, the transition structure 232 can form a more complex insulation and sealing path with the insulating sealing structure 233 through the groove structure and the first protrusion 23231, and thereby form a larger contact surface, thereby enhancing the insulation and sealing effects, which is beneficial to improving the reliability of the battery cell 20. The first protrusion 23231 can further squeeze the insulating sealing structure 233, increase the compression amount of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312, make the insulating sealing structure 233 more compact, further improve the insulation and sealing properties, and also help to improve the reliability of the battery cell 20.

[0159] In some embodiments of the present application, reference 4 and Figure 5 The first protrusion 23231 is disposed at one end of the cross arm 2323 away from the connecting arm 2321 .

[0160] With reference to the foregoing, the above structure can make the insulating sealing structure 233 have higher insulation and sealing properties between the transition structure 232 and the pole body 231. On this basis, 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 compactness of the structure, reduce materials, save the volume of the transition structure 232, and reduce the weight of the transition structure 232.

[0161] The cross arm 2323 may be formed into the first convex portion 23231 by methods including but not limited to extrusion, casting or injection molding. Since the first convex portion 23231 is disposed at one end of the cross arm 2323 away from the connecting arm 2321, when the transfer structure 232 is manufactured and formed, there are relatively few obstacles around the first convex portion 23231, which can reduce the difficulty of forming the first convex portion 23231.

[0162] In the above technical solution, since the first convex portion 23231 is arranged at the end of the cross arm 2323, it is beneficial to reduce the size of the cross arm 2323 and make the structure of the adapter structure 232 more compact, while satisfying 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 a good insulation and sealing effect, thereby reducing the weight of the adapter structure 232, which is beneficial to improving the unit volume energy density of the battery cell 20. In addition, since the first convex portion 23231 is arranged at the end of the cross arm 2323, it is also relatively easy to form the first convex portion 23231 on the cross arm 2323, reducing the difficulty of forming the first convex portion 23231, improving manufacturability, and reducing the difficulty of forming is also beneficial to improving product yield.

[0163] In some embodiments of the present application, reference Figure 5 The cross arm 2323 and the first protrusion 23231 together form an outer annular surface 2323a facing the edge portion 2312; the insulating sealing structure 233 includes a sealing member 2331, and the sealing member 2331 includes a first sealing portion 23311, which is insulated and sealed between the outer annular surface 2323a and the edge portion 2312.

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

[0165] The seal 2331 may refer to a structure or component that plays a sealing role in the insulating seal structure 233. The seal 2331 may be made of, but not limited to, a rubber material, a plastic material, etc., wherein the rubber material may be, but not limited to, nitrile rubber, etc., and the plastic material may be, but not limited to, tetrafluoroethylene, etc. Exemplarily, the seal 2331 may be an annular component disposed around the circumference of the pole body 231, for example, the seal 2331 may be a rubber sealing ring.

[0166] The seal 2331 may include only the first seal portion 23311, in which case the first seal portion 23311 is the seal 2331. The seal 2331 may include not only the first seal portion 23311 but also other structures or parts, in which case the first seal 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 portion 23311 can form a larger sealing surface between the cross arm 2323 and the edge portion 2312, so that the cross arm 2323 and the edge portion 2312 have better sealing, reducing the risk of electrolyte leakage from between the cross arm 2323 and the edge portion 2312, thereby improving the reliability of the pole component 23, and further improving the reliability of the battery cell 20.

[0168] In some embodiments of the present application, reference Figure 5 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 portion 23312, which is insulated and sealed between the inner annular surface 2323b and the pole body 231, and connected to the first sealing portion 23311.

[0169] The inner annular surface 2323 b may refer to an annular surface of the cross arm 2323 disposed around the circumference of the pole body 231 .

[0170] Referring to the foregoing, the seal 2331 may include not only the first seal portion 23311, but also the second seal portion 23312, and the second seal portion 23312 and the first seal portion 23311 may form an L-shaped structure. It is understandable that a first sealing line may be formed between the first seal portion 23311 and the outer annular surface 2323a, and a second sealing line may be formed between the second seal portion 23312 and the inner annular surface 2323b. Through the cooperation of the second sealing line and the first sealing line, a larger sealing surface may be formed between the seal 2331 and the cross arm 2323, thereby improving the sealing performance and reducing the risk of sealing 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 the present application, reference Figure 6 , along the thickness direction of the first wall 201 , the height of the cross arm 2323 is H1 , and the protruding 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 protruding height of the first protrusion 23231 and the height of the cross arm 2323 within the above range, the protruding height of the first protrusion 23231 can be controlled within a suitable range, reducing the risk of the cross arm 2323 breaking through the material ductility limit and being damaged due to the large height of the first protrusion 23231, and also reducing the risk of the cross arm 2323 structure being deformed or damaged due to the stress concentration position of the cross arm 2323 caused by the large height of the first protrusion 23231. In other words, the above solution can ensure the reliability of the cross arm 2323 as a whole. Secondly, by controlling the protruding height of the first protrusion 23231 within a suitable range, the molding difficulty of the first protrusion 23231 can also be reduced, the manufacturability of the first protrusion 23231 can be improved, and the cost can be reduced.

[0175] In some embodiments of the present application, reference Figure 4 and Figure 5 The pole body 231 includes a main body 2311 and an edge portion 2312 connected to each other. The edge portion 2312 is arranged around the circumference of the main body 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 portion 2312 may refer to an annular portion arranged around the circumference of the main body 2311. Figure 5 In the third direction Z, the thickness of the edge portion 2312 may be smaller than the thickness of the main body portion 2311 .

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

[0178] Since the second protrusion 2313 is arranged to protrude toward the cross arm 2323, on the basis of the first protrusion 23231 having been set, the compression amount of the insulating sealing structure 233 can be further increased through the second protrusion 2313, so that the insulating sealing structure 233 is further compressed more tightly, and the insulating and sealing path formed by the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312 is further complicated, thereby increasing the contact surface formed by the deformation between the cross arm 2323 and the insulating sealing structure 233, thereby further enhancing the insulation and sealing 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 position of the pole component 23.

[0179] In the above technical solution, the cooperation between the second protrusion 2313 and the first protrusion 23231 can make the insulating sealing structure 233 have a larger 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 of the insulating sealing structure 233, and further improving the reliability of the battery cell 20.

[0180] In some embodiments of the present application, reference Figure 5 , along the thickness direction of the connecting arm 2321, the second protrusion 2313 and the first protrusion 23231 are staggered.

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

[0182] In the above technical solution, the second protrusion 2313 and the first protrusion 23231 are staggered, so that the insulating sealing structure 233 can form a winding insulating sealing surface between the cross arm 2323, the first protrusion 23231, the second protrusion 2313 and the edge portion 2312. On the one hand, the complexity of the insulation and sealing path is further increased, and the area of ​​the contact surface can be further increased. On the other hand, the insulating sealing structure 233 can be pressed more tightly, and the insulating sealing structure 233 is not easy to be separated from the groove structure formed between the cross arm 2323 and the edge portion 2312 along the thickness direction of the connecting arm 2321, which can improve the installation reliability of the insulating sealing structure 233, and further improve the reliability of insulation and sealing. The above structure can also make the arrangement of the cross arm 2323 and the edge portion 2312 along the thickness direction of the first wall 201 more compact on the basis of meeting a higher insulation and sealing effect, thereby improving the overall structural compactness of the pole component 23, which is conducive to reducing the overall volume of the pole component 23 and improving the single volume energy density of the battery cell 20.

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

[0184] In the above technical solution, the projection of the first protrusion 23231 on the connecting arm 2321 and the projection of the second protrusion 2313 on the connecting arm 2321 partially overlap, so that the portion of the insulating sealing structure 233 between the cross arm 2323 and the edge portion 2312 can be compressed to form an "S" shape, which can form a more complex insulation and sealing path between the cross arm 2323 and the edge portion 2312 of the insulating sealing structure 233, and have a larger contact surface, which can further improve the durability and reliability of insulation and sealing. The above structure allows the insulating sealing structure 233 to be partially compressed to form an "S"-shaped structure, and can also further reduce the probability of the insulating sealing structure 233 escaping from between the cross arm 2323 and the edge portion 2312, thereby improving the overall reliability of the pole component 23. The use of the above structure can also further improve the structural compactness of the pole component 23, which is conducive to further reducing the volume of the pole component 23, thereby improving the unit volume energy density of the battery cell 20.

[0185] In some embodiments of the present application, reference Figure 4 and Figure 5 The insulating sealing structure 233 includes a sealing member 2331, which is insulated and sealed 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 sealing member 2331 on the first wall 201 at least partially overlap.

[0186] It can be understood that, along the thickness direction of the first wall 201, the projection of the second protrusion 2313 on the first wall 201 may be only partially overlapping 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 is entirely located within the projection of the seal 2331 on the first wall 201, and no specific limitation is made here.

[0187] In the above technical solution, the seal 2331 serves as a component that seals between the pole body 231 and the cross arm 2323. 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, so that the second protrusion 2313 can compress the seal 2331, increase the compression amount of the seal 2331, improve the sealing between the pole body 231 and the cross arm 2323, reduce the risk of electrolyte leakage, and further improve the reliability of the pole component 23, thereby improving the reliability of the battery cell 20.

[0188] In some embodiments of the present application, the projection of the second protrusion 2313 on the first wall 201 is entirely located within the projection of the sealing member 2331 on the first wall 201 .

[0189] In the above technical solution, the second protrusion 2313 can have a larger contact surface with the seal 2331, and has a greater compressive force on the seal 2331, thereby enabling the seal 2331 to have a greater compression amount, thereby improving the sealing reliability between the pole 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 out from between the pole body 231 and the cross arm 2323, which can improve the installation reliability of the seal 2331, and is also conducive to improving the sealing reliability and the reliability of the battery cell 20.

[0190] In some embodiments of the present application, reference Figure 7 and Figure 8 Along the thickness direction of the connecting arm 2321, the opposite ends of the second protrusion 2313 are provided with transition fillets or chamfers.

[0191] refer to Figure 7 Along the thickness direction of the connecting arm 2321 , transition fillets are provided at opposite ends of the second protrusion 2313 .

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

[0193] In the above technical solution, no matter whether transition fillets or chamfers are set at the opposite ends of the second protrusion 2313, the above structure can reduce the probability of stress concentration on the second protrusion 2313, improve the overall reliability of the edge portion 2312, and reduce the probability of sharp structures on the second protrusion 2313. It can reduce the probability of the pole component 23 scratching the staff during the assembly process and improve the convenience of assembly.

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

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

[0196] The third protrusion 2324 may refer to a structure in the cantilever 2322 that protrudes relative to other parts. For ease of understanding, the third protrusion 2324 may refer to a boss or a convex bump that protrudes from the cantilever 2322 .

[0197] In the above technical solution, the cantilever 2322 squeezes the first insulating member 2332 through the third protrusion 2324, thereby having a larger contact surface between the cantilever 2322 and the first insulating member 2332, and forming a relatively complex insulation path between the first insulating member 2332 and the cantilever 2322, thereby improving the insulation protection performance of the first insulating member 2332, improving the insulation of the pole component 23, and improving the reliability of the battery cell 20. The third protrusion 2324 can also press the first insulating member 2332, enhance the restraining and limiting effect on the first insulating member 2332, reduce the probability of the first insulating member 2332 coming out from between the cantilever 2322 and the pole body 231, and improve the installation reliability and firmness of the first insulating member 2332, which is also conducive to improving the reliability of the battery cell 20.

[0198] In some embodiments of the present application, reference Figure 6 , along the thickness direction of the first wall 201 , the height of the cantilever 2322 is H3, and the protruding 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 protruding height of the third protrusion 2324 and the height of the cantilever 2322 within the above range, the protruding height of the third protrusion 2324 can be controlled within a suitable range, reducing the risk of the cantilever 2322 breaking through the material ductility limit and being damaged due to the large height of the third protrusion 2324, and also reducing the risk of the cantilever 2322 having a stress concentration position due to the large height of the third protrusion 2324, thereby causing the cantilever 2322 structure to be deformed or damaged. In other words, the above solution can ensure the reliability of the cantilever 2322 as a whole. Secondly, by controlling the protruding height of the third protrusion 2324 within a suitable range, the difficulty of forming the third protrusion 2324 can also be reduced, the manufacturability of the third protrusion 2324 can be improved, and the cost can be reduced.

[0201] In some embodiments of the present application, reference Figure 5 The pole body 231 includes a main body 2311 and an edge portion 2312 connected to each other. The edge portion 2312 is arranged around the circumference of the main body 2311 , and the edge portion 2312 is provided with a fourth protrusion 2314 protruding toward the cantilever 2322 .

[0202] The fourth protrusion 2314 may refer to a structure in the edge portion 2312 that protrudes relative to other portions. For ease of understanding, the fourth protrusion 2314 may be understood as a boss or convex bump protruding from the edge portion 2312 .

[0203] Since the fourth protrusion 2314 is arranged to protrude toward the cantilever 2322, on the basis of the third protrusion 2324 having been set, the fourth protrusion 2314 can further increase the complexity of the insulation path formed between the first insulating member 2332 and the cantilever 2322, and can further increase the compression amount of the first insulating member 2332, and further compress the first insulating member 2332 more tightly, thereby further enhancing the insulation of the first insulating member 2332 between the cantilever 2322 and the edge portion 2312, and reducing the risk of electrolyte leakage from the pole component 23.

[0204] In the above technical solution, the fourth protrusion 2314 and the third protrusion 2324 cooperate with each other to make the first insulating member 2332 have a larger compression amount, and can further increase 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 the present application, reference Figure 5 , along the thickness direction of the connecting arm 2321, the fourth protrusion 2314 and the third protrusion 2324 are staggered.

[0206] In the above technical solution, the fourth protrusion 2314 and the third protrusion 2324 are staggered, so that the first insulating member 2332 can form a winding insulating path between the cantilever 2322, the third protrusion 2324, the fourth protrusion 2314 and the edge portion 2312, which can increase the area of ​​the contact surface on the one hand, and on the other hand, can press the first insulating member 2332 more tightly, and it is not easy to escape from the groove structure formed between the cantilever 2322 and the edge portion 2312 along the thickness direction of the connecting arm 2321, which can improve the installation reliability of the first insulating member 2332, and further improve the insulation reliability. The above structure can also make the cantilever 2322 and the edge portion 2312 more compactly arranged along the thickness direction of the first wall 201 on the basis of meeting a higher insulation effect, thereby improving the overall structural compactness of the pole component 23, which is conducive to reducing the overall volume of the battery cell 20 and improving the volume energy density of the battery cell 20.

[0207] In some embodiments of the present application, along the thickness direction of the connecting arm 2321 , two opposite ends of the fourth protrusion 2314 are provided with transition fillets or chamfers.

[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, and the probability of sharp structures on the fourth protrusion 2314 can be reduced. The risk of the pole component 23 scratching the staff during the assembly process can be reduced, and the convenience of assembly can be improved.

[0209] In some embodiments of the present application, reference Fig. 9 and Fig.10 The transition structure 232 is an integrally formed part and includes a preformed part 2301 and a riveted formed part 2302. The preformed part 2301 is connected to the first wall 201 and includes a cross arm 2323. The riveted formed part 2302 is connected to the preformed part 2301 and includes a connecting arm 2321 and a cantilever 2322; and / or, the transition structure 232 is integrally arranged with the shell part 21.

[0210] The transition structure 232 may be a metal part, for example, the transition structure 232 may be made of aluminum. Optionally, the transition structure 232 may be pre-punched and formed, wherein the pre-formed portion 2301 may refer to a portion that is not further processed after being pre-formed, and the riveted forming portion 2302 may refer to a portion that needs to be riveted later, as shown in FIG. Fig. 9 and Fig.10The insulating sealing structure 233 may include a sealing member 2331 and a first insulating member 2332. The edge portion 2312 may be assembled to the cross arm 2323 through the sealing member 2331. Then, the first insulating member 2332 is assembled to the edge portion 2312 and the main body 2311. Finally, the riveting forming portion 2302 is extruded on the first insulating member 2332 by riveting to form Figure 4 The pole part 23 is shown.

[0211] In other examples, the first insulating member 2332 may also be post-assembled. For example, the riveted forming portion 2302 is bent toward the edge portion 2312 by riveting to form a connecting arm 2321 and a 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] In addition, on the basis that the transition structure 232 is an integrally formed part, the transition structure 232 can also be formed on the housing component 21, so that the transition structure 232 and the housing component 21 are an integral part. The transition structure 232 can also be integrally formed with the housing component 21, that is, a part of the structure of the housing component 21 forms the transition structure 232, for example, the first wall 201 of the housing component 21 is partially stamped to form the transition structure 232.

[0213] In the above technical solution, the transfer structure 232 is an integrally formed part, and the connecting arm 2321 and the cantilever 2322 are formed by riveting, so that the overall consistency of the transfer structure 232 is relatively good, and the connection gap is also small, which can enhance the connection strength between the transfer structure 232 and the pole body 231 and reduce the risk of loosening. In addition, the riveting and pressing method can also form a good sealing effect, further improve the sealing between the transfer structure 232 and the pole body 231, which is conducive to improving the reliability of the transfer structure 232, and then improve the reliability of the pole component 23. The transfer structure 232 and the shell component 21 are set as one piece, so that the structure formed by the transfer structure 232 and the shell component 21 has a high consistency, and can further reduce the connection gap, enhance the sealing effect, improve the reliability of the battery cell 20, and can also reduce the number of parts, reduce assembly steps, and improve work efficiency.

[0214] In some embodiments of the present application, reference Figure 3 and Figure 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 refer to Figure 3 .

[0216] The “plane where the outer wall surface 201 b is located” may refer to a plane coplanar with the outer wall surface 201 b .

[0217] The thickness direction of the first wall 201 can refer to Figure 6 The third direction Z of the “thickness direction of the connecting arm 2321” can refer to Figure 6 The first direction X.

[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”, it can be understood that, since the cantilever 2322 is used to limit the insulating sealing structure 233, and to ensure that the surface of the pole body 231 facing away from the electrode component 22 has a larger area for connecting parts 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 regarded as an upright arm plate, and the size of the connecting arm 2321 in the first direction X can be reduced. Among them, the connecting arm 2321 can be perpendicular to the outer wall surface 201b; or, the connecting arm 2321 is 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 position of the pole body 231, the cantilever 2322 is used to compress part of the structure 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 between the edge portion 2312 and the cross arm 2323 can be a seal 2331. Since the connecting arm 2321 is perpendicular or substantially perpendicular to the outer wall surface 201b, the compression force arm 235 formed by the adapter structure 232 on the seal 2331 is relatively short (see Figure 5 ), the compression arm 235 may refer to Figure 5 The connecting line between the two points can increase the force of the connecting arm 2321 and the cantilever 2322 on the sealing member 2331, which is beneficial to increase the compression amount of the sealing member 2331 and improve the sealing reliability of the sealing member 2331.

[0220] For ease of understanding, further examples can be given to illustrate that the transition structure 232 can be installed on the pole body 231 through the insulating sealing structure 233 by riveting, thereby forming a connecting arm 2321 and a cantilever 2322. When the force applied by the riveting is removed, since the compression force arm 235 formed by the transition structure 232 on the seal 2331 is relatively short, the reaction force arm of the seal 2331 rebounding on the cantilever 2322 is also relatively short, so that the seal 2331 can be maintained at a relatively large compression amount, which is conducive to improving the problem of compression attenuation of the seal 2331, so that the compression amount of the seal 2331 can be maintained 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] In addition, refer to Figure 5 and Fig.11 , since the connecting arm 2321 is perpendicular or substantially perpendicular to the outer wall surface 201b, the structure formed by the connecting arm 2321, the cantilever 2322 and the cross arm 2323 and the pole body 231 is more compact, which is conducive to reducing the size of the adapter 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, when the size of the first wall 201 in the second direction Y is the same, in the pole component 23 of the present application, the size of the pole body 231 in the second direction Y can be made larger, which is conducive to increasing the exposed surface 2311a of the pole body 231. When the pole body 231 is connected to the busbar component or other power connection component through the exposed surface 2311a, the exposed surface 2311a and the busbar component or other power connection component can have a larger connection surface (such as a welding surface), so that the pole body 231 can also have a larger flow area, which can improve the charging and discharging efficiency and is conducive to realizing a higher performance narrow battery cell design.

[0222] In the above technical solution, the connecting arm 2321 can be a vertical arm perpendicular to or substantially perpendicular to the first wall 201, which can reduce the compressive force arm 235 of the adapter 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 between the edge portion 2312 and the cross arm 2323, enhance the insulation and sealing effect, and help improve the insulation and sealing reliability of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323, and improve the overall reliability of the battery cell 20. On the other hand, the above structure can also make the structure of the adapter structure 232 more compact, thereby making the overall structure of the pole component 23 more compact, so that the pole body 231 can have a larger exposed surface 2311a, which is conducive to increasing the flow area of ​​the pole body 231 and improving the current carrying capacity of the pole body 231.

[0223] In some embodiments of the present application, reference Figure 3 and Figure 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 compressive force 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, 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 of the pole component 23, the pole body 231 has a larger exposed surface 2311a, further improving the current carrying capacity of the pole body 231. Secondly, the connecting arm 2321 being perpendicular to the first wall 201 can be more easily realized during manufacturing, which can improve manufacturability and reduce costs.

[0225] In some embodiments of the present application, reference Figure 6 The cantilever 2322 includes a root 23221 and a beam 23222, and the beam 23222 is connected to the connecting arm 2321 through a rounded transition of the root 23221; the insulating sealing structure 233 includes a sealing member 2331, and the sealing member 2331 is at least partially insulated and sealed between the cross arm 2323 and the edge portion 2312.

[0226] The root portion 23221 may refer to a portion of the cantilever 2322 connected to the connecting arm 2321, and the beam portion 23222 may refer to a portion of the cantilever 2322 close to the pole body 231. Figure 6 , in order to distinguish the root 23221 and the beam 23222, Figure 6 Two auxiliary dotted lines are drawn on the cantilever 2322 . In the cantilever 2322 , the portion between the two auxiliary dotted lines is the root 23221 , and the remaining portion is the beam 23222 .

[0227] The seal 2331 may refer to a structure or component that plays a sealing role in the insulating seal structure 233. The seal 2331 may be made of, but not limited to, a rubber material, a plastic material, etc., wherein the rubber material may be, but not limited to, nitrile rubber, etc., and the plastic material may be, but not limited to, tetrafluoroethylene, etc. Exemplarily, the seal 2331 may be an annular component disposed 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 ”, which can be understood as the seal 2331 can be completely arranged between the cross arm 2323 and the edge portion 2312 , or can be partially arranged between the cross arm 2323 and the edge portion 2312 .

[0229] In the above technical solution, by setting the cantilever 2322 to the above structure, the beam 23222 is connected to the connecting arm 2321 through the root 23221 with a rounded transition, so that the connection position of the cantilever 2322 and the connecting arm 2321 is relatively rounded and smooth, which can reduce the probability of stress concentration. By setting the insulating sealing structure 233 to include a seal 2331, the seal 2331 can play a sealing role between the cross arm 2323 and the edge portion 2312, reducing the probability of sealing failure at the location of the pole component 23, and improving the reliability of the battery cell 20.

[0230] In some embodiments of the present application, reference Fig.12 The beam portion 23222 is inclined or bent relative to the root portion 23221 toward the direction close to the first wall 201 .

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

[0232] The cantilever 2322 may be manufactured so that the beam portion 23222 is inclined relative to the root portion 23221 toward the direction close to the first wall 201. For example, the cantilever 2322 is cast or injection molded. The cantilever 2322 may also be formed after the base is formed and then processed so that the beam portion 23222 is bent relative to the root portion 23221 toward the direction close to the first wall 201. For example, the cantilever 2322 is riveted to form the root portion 23221 and the beam portion 23222, or is bent to form the root portion 23221 and the beam portion 23222.

[0233] According to the above analysis, the pole body 231 is more susceptible to a force in a direction away from the first wall 201, which causes the pole body 231 to be outwardly separated from the adapter structure 232 and causes the cantilever 2322 to deform. In the above structure, the beam 23222 is inclined or bent relative to the root 23221 in a direction close to the first wall 201, and the cantilever 2322 has relatively high strength and rigidity. When the pole body 231 is subjected to a force away from the first wall 201, it is necessary to first overcome the inclination or bending structure of the cantilever 2322, straighten the cantilever 2322 first, and then tilt the beam 23222 relative to the root 23221 in a direction away from the first wall 201, so that the edge portion 2312 can be separated from the adapter structure 232. Obviously, to complete this process, the pole body 231 needs to withstand a greater force, which is relatively difficult, thereby reducing the risk of the pole body 231 separating from the adapter structure 232.

[0234] Secondly, since the edge portion 2312 is bent toward the direction close to the cantilever 2322, the bending direction of the edge portion 2312 is opposite to the direction of the inclined or bent structure in the cantilever 2322. If the pole body 231 wants to detach from the adapter structure 232, it is also necessary to overcome the bending structure of the edge portion 2312, that is, to straighten the edge portion 2312 and then bend it toward the direction close to the first wall 201. Combined with the above, the difficulty of the pole body 231 detaching from the adapter structure 232 is further increased, and the probability of detachment is also lower, thereby making the overall structure of the pole component 23 more stable and more reliable.

[0235] In the above technical scheme, the adoption of the above structure can improve the overall strength of the cantilever 2322, and the inclination or bending direction of the cantilever 2322 is opposite to the direction in which the pole body 231 is forced to separate from the adapter structure 232, and is also opposite to the bending direction of the edge portion 2312, which is conducive to increasing the difficulty of the edge portion 2312 bending toward the side close to the first wall 201 and reducing the risk of the connecting arm 2321 bending toward the side away from the pole body 231, thereby reducing the probability of the pole body 231 being forced to separate from the adapter structure 232, improving the overall reliability of the pole component 23, and then improving the reliability of the insulating sealing structure 233, thereby improving the reliability of the battery cell 20.

[0236] In some embodiments of the present application, reference Figure 6 and Fig.13 , the included angle between the beam portion 23222 and the connecting arm 2321 is θ1, wherein 85 degrees ≤ θ1 ≤ 95 degrees.

[0237] θ1 may 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 and Fig.13 , the included angle θ1 between the beam portion 23222 and the connecting arm 2321 is 90 degrees.

[0238] In the above technical solution, by setting the angle θ1 between the beam 23222 and the connecting arm 2321 within the above range, the appropriate 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 adapter structure 232 of different sizes.

[0239] In some embodiments of the present application, reference Figure 6 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 in a direction close to the connecting arm 2321 .

[0240] In the above technical solution, the above structure can increase the bending position formed on the cantilever 2322 and increase the number of bending times, thereby further improving the structural strength and rigidity of the cantilever 2322, reducing the probability that the pole body 231 forces the adapter structure 232 to deform, thereby causing the pole body 231 to escape from the adapter structure 232, and improving the reliability of the pole component 23, thereby improving the overall reliability of the battery cell 20.

[0241] In some embodiments of the present application, reference Figure 6 The included angle between the third protrusion 2324 and the beam portion 23222 is θ2, wherein 85 degrees ≤ θ2 ≤ 95 degrees.

[0242] θ2 may 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 , an angle θ2 between the third protrusion 2324 and the beam portion 23222 is 90 degrees.

[0243] In the above technical solution, by setting the angle θ2 between the third protrusion 2324 and the beam portion 23222 within the above range, the appropriate 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 portion 23222 can be adjusted to meet the stiffness and strength requirements of cantilevers 2322 of different sizes.

[0244] In some embodiments of the present application, reference Fig.14 and Fig.15 The cantilever 2322 includes a root 23221 and a beam 23222 , the root 23221 is arc-shaped and connects the connecting arm 2321 and the beam 23222 ; the insulating sealing structure 233 includes a sealing member 2331 , which is at least partially insulated and sealed between the cross arm 2323 and the edge portion 2312 .

[0245] “The root 23221 is in an arc shape” can be understood as the root 23221 being an arc arm (see Fig.14 and Fig.15 ). For ease of understanding, Fig.14 and Fig.15 In the figure, two auxiliary dotted lines are drawn on the cantilever 2322 to distinguish them. 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 23221 is in an arc shape, so that the transition between the cantilever 2322 and the connecting arm 2321 is more rounded and smooth, and the risk of stress concentration is smaller, which can improve the reliability of the cantilever 2322, and then improve the reliability of the transition structure 232, thereby improving the overall reliability of the pole component 23. Moreover, the arc-shaped root 23221 has a larger fillet, which can reduce the difficulty of forming whether it is cast, bent or riveted, which can improve the product yield and reduce manufacturing costs. By configuring the insulating sealing structure 233 to include a seal 2331, the seal 2331 can play a sealing role between the cross arm 2323 and the edge portion 2312, reducing the problem of sealing failure at the location of the pole component 23, and improving the reliability of the battery cell 20.

[0247] In some embodiments of the present application, reference Fig.15 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 angle between the beam portion 23222 and the connecting arm 2321 is θ3, wherein θ3<90 degrees.

[0248] The cantilever 2322 may be manufactured so that the beam portion 23222 is inclined relative to the root portion 23221 toward the direction close to the first wall 201. For example, the cantilever 2322 is cast or injection molded. The cantilever 2322 may also be formed after the base is formed and then processed so that the beam portion 23222 is bent relative to the root portion 23221 toward the direction close to the first wall 201. For example, the cantilever 2322 is riveted to form the root portion 23221 and the beam portion 23222, or is bent to form the root portion 23221 and the beam portion 23222.

[0249] The technical effect of the tilted or bent structure of the cantilever 2322 can be referred to above and will not be described in detail here.

[0250] When the beam 23222 is inclined or bent relative to the root 23221 in a direction close to the first wall 201, the root 23221 may also be inclined relative to the connecting arm 2321 in a direction away from the pole body 231. Therefore, the angle θ3 between the beam 23222 and the connecting arm 2321 is less than 90 degrees. This makes the connection position of the root 23221 tangent to the connecting arm 2321, or the root 23221 is inclined relative to the connecting arm 2321 in a direction close to the pole body 231. Therefore, when the pole body 231 is subjected to a force in a direction away from the first wall 201, the probability of the beam 23222 undergoing a large position deformation relative to the connecting arm 2321 is relatively low, and the wind direction in which the pole body 231 is separated from the adapter structure 232 is relatively small, which can improve the overall reliability of the pole component 23.

[0251] In the above technical scheme, the adoption of the above structure can improve the overall strength of the cantilever 2322, and the inclination or bending direction of the cantilever 2322 is opposite to the direction in which the pole body 231 is forced to separate from the adapter structure 232, and is also opposite to the bending direction of the edge portion 2312, which is conducive to increasing the difficulty of the edge portion 2312 bending toward the side close to the first wall 201 and reducing the risk of the connecting arm 2321 bending toward the side away from the pole body 231, thereby reducing the probability of the pole body 231 being forced to separate from the adapter structure 232, improving the reliability of the pole component 23, and then improving the reliability of the insulating sealing structure 233, thereby improving the reliability of the battery cell 20.

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

[0253] It can be understood that, further, the 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 angle θ3, it is beneficial to more accurately select a more suitable angle value to meet the angle between the beam 23222 and the connecting arm 2321 of the pole body 231 in most sizes, so as to meet the strength and stiffness requirements of the cantilever 2322, thereby reducing the difficulty of screening the angle value, simplifying the manufacturing process, and further helping to reduce the production cost of the battery cell 20.

[0255] In some embodiments of the present application, reference Figure 3 and Figure 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 on the plane where the outer wall surface 201b is located and the projection of the sealing member 2331 on the plane where the outer wall surface 201b is located at least partially overlap.

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

[0257] The “plane where the outer wall surface 201b is located” can be referred to the previous explanation and will not be repeated here.

[0258] “The projection of the root 23221 on the plane where the outer wall 201b is located and the projection of the seal 2331 on the plane where the outer wall 201b is located at least partially overlap”, which can be understood as, the projection of the root 23221 on the plane where the outer wall 201b is located can be completely located within the projection of the seal 2331 on the plane where the outer wall 201b is located, or, part of the projection of the root 23221 on the plane where the outer wall 201b is located is located within the projection of the seal 2331 on the plane where the outer wall 201b is located. Taking the cantilever 2322, the edge portion 2312 and the cross arm 2323 arranged in the up and down direction as an example, at least part of the seal 2331 is located directly below the root 23221. It can be understood that both the beam 23222 and the root 23221 can compress the seal 2331 through the edge portion 2312, which can provide a larger compression surface for the seal 2331, thereby increasing the compression amount of the seal 2331.

[0259] In the above technical solution, the above structure can increase the action surface of the cantilever 2322 on the seal 2331, so that the seal 2331 can have a larger compression amount between the cross arm 2323 and the edge portion 2312, which can enhance the sealing performance of the seal 2331, improve the sealing reliability between the transition structure 232 and the pole body 231, and then improve the reliability of the pole component 23, and finally improve the reliability of the battery cell 20.

[0260] In some embodiments of the present application, reference Figure 6 , along the thickness direction of the first wall 201, the height of the cross arm 2323 is H1, and along the thickness direction of the connecting arm 2321, the length of the cross arm 2323 is L1, wherein H1 and L1 satisfy the following formula:

[0261] y=-(P·L1 4 ) / 8E(b·H1 3 / 12)

[0262] Wherein, y is the disturbance of the cross arm 2323, which should be less than 25% of the compression of the insulating sealing structure 233;

[0263] P is the maximum rebound force of the insulating sealing structure 233 after compression, in N;

[0264] E is the elastic module of the cross arm 2323, in GPa;

[0265] b is the circumference of the cross arm 2323 in the circumferential direction of the pole body 231, in mm.

[0266] The thickness direction of the first wall 201 can refer to Figure 7 The third direction Z.

[0267] The thickness direction of the connecting arm 2321 can be referred to as Figure 7 The first direction X.

[0268] y is the disturbance of the cross arm 2323, which can be determined according to the compression amount of the portion of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323, and / or the compression amount of the portion of the insulating sealing structure 233 between the edge portion 2312 and the cantilever 2322. Figure 5 The disturbance of the cross arm 2323 can be determined according to the compression amount of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323, wherein the compression amount of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323 can be 1 mm, and the disturbance y of the cross arm 2323 can be less than 0.25 mm.

[0269] The portion of the insulating sealing structure 233 between the edge portion 2312 and the cross arm 2323 can be recorded as a seal 2331 , and the P value can be calculated by multiplying the pressure area of ​​the seal 2331 by the stress per unit area.

[0270] In the above technical solution, by adopting the above formula, a more suitable height and length of the cross arm 2323 can be calculated, so that the cross arm 2323 has higher strength and rigidity, which can reduce the probability of large deformation of the cross arm 2323 when the pole body 231 is subjected to force, thereby improving the reliability of the insulating sealing structure 233 between the transition structure 232 and the pole body 231, reducing the risk of insulation and sealing failure, and improving the reliability of the battery cell 20.

[0271] In some embodiments of the present application, reference Figure 4 , Figure 5 , Fig.12 and Fig.14 The insulating sealing structure 233 includes a sealing member 2331 and a first insulating member 2332 . The sealing member 2331 is insulated and sealed between the cross arm 2323 and the edge portion 2312 . The first insulating member 2332 is insulated and fitted between the connecting arm 2321 and the pole body 231 , and between the cantilever 2322 and the pole body 231 .

[0272] The explanation of the sealing member 2331 and the first insulating member 2332 can be found in the previous text and will not be repeated here.

[0273] In the above technical solution, the first insulating member 2332 can play an insulating role around the pole body 231, reducing the risk of short circuit or other electrical safety accidents, and the first insulating member 2332 can also play a sealing role together with the sealing member 2331. The first insulating member 2332 serves as the first sealing line of defense, and the sealing member 2331 serves as the second sealing line of defense, thereby playing a double protection role, reducing the probability of electrolyte leakage from the inside of the shell component 21, and can effectively resist the intrusion of moisture and dust, thereby improving the reliability of the battery cell 20.

[0274] In some embodiments of the present application, the sealing member 2331 and the first insulating member 2332 are integrally formed.

[0275] In the above technical solution, the above structure can reduce the assembly steps and simplify the assembly process. For large-scale production of battery cells 20, it can improve assembly efficiency and reduce the waste of raw materials. Since there is no need to manufacture the seal 2331 and the first insulating member 2332 separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The seal 2331 and the first insulating member 2332 are integrally formed, which is also conducive to reducing the problem of small gaps or loose connections between the seal 2331 and the first insulating member 2332, which can reduce the risk of failures such as poor sealing and reduce the probability of electrolyte leakage, which is conducive to improving the reliability of the battery cell 20.

[0276] In some embodiments of the present application, reference Fig.16 and Fig.17 The insulating sealing structure 233 includes a second insulating member 2333 , and the second insulating member 2333 is coated on the outer peripheral side surfaces of the connecting arm 2321 and the cantilever 2322 .

[0277] The explanation of the second insulating member 2333 may refer to the first insulating member 2332 and will not be repeated here.

[0278] During the assembly and use of the battery cell 20, the pole body 231 may accidentally come into contact with surrounding metal parts (such as the shell part 21, the poles of other battery cells 20 or the conductive connecting parts in the battery pack, etc.), and a short circuit is likely to occur without insulation protection. Therefore, the pole body 231, as a key component for current entering and exiting the battery cell 20, can provide an effective insulation barrier by arranging a second insulating member 2333 on the outer peripheral side of the connecting arm 2321 and the cantilever 2322, thereby reducing the probability of a short circuit.

[0279] In high-voltage battery cells, uneven electric fields may cause local discharge and damage the performance and life of the battery. By wrapping the second insulating member 2333 around the outer peripheral sides of the connecting arm 2321 and the cantilever 2322, a uniform insulating environment can be formed around the pole body 231, which helps to stabilize the electric field distribution around the pole body 231.

[0280] During the transportation, installation and use of the battery cell 20, the pole body 231 may be subjected to various external impacts, such as collision, vibration, etc. The second insulating member 2333 can play a buffering role on the periphery of the transition structure 232, absorb part of the external force, and reduce the direct impact on the pole body 231, which is beneficial to ensure the integrity and conductivity of the pole body 231.

[0281] In the above technical solution, the above structure can play an insulating protection role in the outer circumferential direction of the pole body 231, reduce the risk of electrical safety accidents such as short circuits, stabilize the surrounding electric field distribution, and reduce the probability of damage to the battery cell 20 due to uneven electric field. Secondly, the second insulating member 2333 can also form a protective layer on the circumference of the connecting arm 2321 and the cantilever 2322, which can play a buffering and vibration reduction role, thereby reducing the impact on the pole body 231 and reducing the probability of damage to the pole body 231, thereby improving the reliability of the battery cell 20.

[0282] In some embodiments of the present application, reference Fig.16 , the first insulating member 2332 is injection molded between the connecting arm 2321, the cantilever 2322 and the pole body 231, and the second insulating member 2333 is injection molded on the outer peripheral side of the connecting arm 2321 and the cantilever 2322. In other words, the first insulating member 2332 and the second insulating member 2333 can be obtained by two times of overmolding. In this way, when some microscopic gaps are formed on the surface or inside due to mold accuracy, material shrinkage and other reasons during the first overmolding process, these gaps can be filled by the secondary overmolding, thereby further improving the insulation performance. Moreover, by injection molding the second insulating member 2333 and the first insulating member 2332 separately, the molding difficulty can be reduced and the manufacturing cost can be reduced.

[0283] In some embodiments of the present application, reference Fig.17 The second insulating member 2333 and the first insulating member 2332 are integrally formed. It is understandable that the second insulating member 2333 and the first insulating member 2332 are molded by encapsulation at one time, which can reduce the assembly steps and improve work efficiency, while the sealing member 2331 can be assembled separately, which can improve the flexibility of the use of the sealing member 2331 and facilitate the replacement of the sealing member 2331 later.

[0284] In some embodiments of the present application, reference Fig.17, the connecting arm 2321 is provided with a glue injection hole 2321a, and part of the second insulating member 2333 is penetrated through the glue injection hole 2321a and connected 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 liquid can form the second insulating member 2333 on the outer peripheral side of the connecting arm 2321 and the cantilever 2322, while a part of the injection liquid enters the cantilever 2322, the connecting arm 2321 and the edge portion 2312 from between the cantilever 2322 and the main body 2311, and another part directly enters the cantilever 2322, the connecting arm 2321 and the edge portion 2312 from the glue injection hole 2321a, thereby forming the first insulating member 2332. In this way, the flow rate of the injection liquid can be increased, thereby improving the molding efficiency and saving time.

[0285] In some embodiments of the present application, the second insulating member 2333, the first insulating member 2332 and the sealing member 2331 are an integrally formed member.

[0286] In the above technical solution, the above structure can reduce the assembly steps and simplify the assembly process. For large-scale production of battery cells 20, the assembly efficiency can be improved, and the waste of raw materials can be reduced. Since there is no need to manufacture the sealing member 2331, the first insulating member 2332 and the second insulating member 2333 separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The sealing member 2331, the first insulating member 2332 and the second insulating member 2333 are integrally formed, which is also conducive to eliminating the problem of small gaps or loose connections that may exist between the sealing member 2331, the first insulating member 2332 and the second insulating member 2333, which can reduce the risk of failures such as poor sealing, reduce the probability of electrolyte leakage, and help improve the reliability of the battery cell 20.

[0287] In some embodiments of the present application, reference Figure 3 , Figure 4 , Fig.12 , Fig.14 , Fig.16 and Fig.17 The insulating sealing structure 233 includes a third insulating member 2334 . The third insulating member 2334 is disposed on a side of the transition structure 232 close to the electrode component 22 and is sealed with the sealing member 2331 .

[0288] The explanation of the third insulating member 2334 can refer to the first insulating member 2332 mentioned above. For example, the third insulating member 2334 can be a plastic member. The third insulating member 2334 can be closely attached to the inner wall surface of the peripheral side of the housing component 21.

[0289] In the above technical solution, the third insulating member 2334 can provide an effective insulating barrier on the side of the adapter structure 232 close to the electrode component 22, isolate the electrode component 22 from the first wall 201 and the adapter structure 232, reduce the risk of short circuit, and allow the current to flow along a predetermined path, which can improve the stability and reliability of the battery cell 20. The third insulating member 2334 can also play a blocking role. On the one hand, it can block the electrolyte from flowing to the pole component 23, reducing the risk of electrolyte leakage, and can also block external moisture, dust and other impurities from entering the shell component 21, causing short circuits, corrosion and other problems in the battery cell 20. In other words, the third insulating member 2334 is conducive to maintaining a clean environment inside the shell component 21, which can ensure that the chemical reaction inside the battery cell 20 can work normally. The third insulating member 2334 can also play a buffering role between the first wall 201 and the electrode component 22, reducing the impact between the first wall 201 and the electrode component 22, and the probability of damage to the electrode component 22, which can improve the reliability of the battery cell 20.

[0290] In some embodiments of the present application, the third insulating member 2334 and the sealing member 2331 are integrally formed.

[0291] In the above technical solution, the above structure can reduce the number of assembly steps and simplify the assembly process. For large-scale production of battery cells 20, the assembly efficiency can be improved, and the waste of raw materials can be reduced. Since there is no need to manufacture the third insulating member 2334 and the sealing member 2331 separately and then connect or assemble them, the scraps and unnecessary processing steps in the production process are reduced, and the manufacturing cost is reduced. The third insulating member 2334 and the sealing member 2331 are integrally formed, which is also conducive to eliminating the problem of tiny gaps or loose connections that may exist between the third insulating member 2334 and the sealing member 2331, which can reduce the risk of failures such as poor sealing, reduce the probability of electrolyte leakage, and help improve the reliability of the battery cell 20.

[0292] In some embodiments of the present application, reference Fig.14 The pole body 231 includes a main body 2311 and an edge portion 2312 connected to each other. The edge portion 2312 is arranged around the circumference of the main body 2311. A gap 234 is formed between the edge portion 2312 and the insulating sealing structure 233 and the transition structure 232 on the side away from the cantilever 2322.

[0293] The gap 234 may refer to a space having a certain size.

[0294] Exemplarily, the insulating sealing structure 233 may include a plurality of sealing members 2331 . The plurality of sealing members 2331 may be disposed between the cross arm 2323 and the edge portion 2312 . A gap 234 may be formed between at least two adjacent sealing members 2331 .

[0295] For example, refer to Fig.14 The insulating sealing structure 233 may also include a sealing member 2331 and a first insulating member 2332, wherein the sealing member 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 sealing member 2331.

[0296] In the above technical solution, the gap 234 can provide the space required for the expansion and deformation of at least part of the structure of the insulating sealing structure 233, and store the gas inside the insulating sealing structure 233, etc., which can reduce the risk that at least part of the structure of the insulating sealing structure 233 cannot be deflated or expanded in time when compressed, and reduce the risk of the transition structure 232 being damaged by squeezing, which can improve the reliability of the pole component 23, and can also reduce the risk of the released gas diffusing into the battery cell 20 and contaminating the electrolyte, which is beneficial to ensure the stability of the chemical reaction inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0297] In some embodiments of the present application, reference Figure 3 The shell component 21 includes a shell 211 and a cover 212 . The shell 211 has an opening, and the cover 212 closes the opening. The first wall 201 is the cover 212 , or is a wall opposite to the shell 211 and the cover 212 .

[0298] The shell 211 may refer to the main structure of the shell component 21, and through the opening on it, the electrode component 22 and the electrolyte are used to enter and exit the shell component 21. The cover 212 may refer to a plate-like structural member, which is used to form the shell component 21 together with the shell 211.

[0299] The first wall 201 may refer to the cover 212, or may refer to a shell wall of the housing 211, and is a shell wall opposite to the cover 212. Optionally, the shape of the housing 211 may be, but is not limited to, a square shell shape, a cylindrical shell shape, and the like.

[0300] In the above technical solution, by arranging the first wall 201 on the cover 212 or the wall of the shell 211 opposite to the cover 212, more options can be provided for the setting position of the pole component 23, thereby increasing the design flexibility of the battery cell 20 to meet different usage requirements.

[0301] The embodiment of the present application provides a battery device 100, including a battery cell 20 as described in any of the above embodiments.

[0302] In the above technical solution, since the battery cell 20 has a higher reliability, the reliability of the battery device 100 using the battery cell 20 can be improved, so that the battery device 100 can have a better performance.

[0303] An embodiment of the present application provides an electric device 1000, including a battery cell 20 as in any of the above embodiments, or a battery device 100 as in the above embodiments, wherein the battery cell 20 or the battery device 100 is used to store or provide electric energy.

[0304] In the above technical solution, since the battery cell 20 or the battery device 100 has a higher reliability, the reliability of the electric device 1000 using the battery cell 20 or the battery device 100 can be improved, and the electric device 1000 can have a better performance.

[0305] Reference Figures 3 to 6 According to an embodiment of the present application, a battery cell 20 is provided, which includes a shell component 21, an electrode component 22 and a pole component 23.

[0306] 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 . The first wall 201 is provided with a mounting hole 201 a .

[0307] The electrode component 22 is accommodated in the housing component 21 .

[0308] The pole component 23 is installed at the installation hole 201 a and includes a pole body 231 , a transition structure 232 and an insulating sealing structure 233 . The pole body 231 is connected to the electrode component 22 , and the transition structure 232 is arranged around the circumference of the pole body 231 .

[0309] The transition structure 232 is connected to the first wall 201 by welding, and includes a connecting arm 2321, and a cantilever 2322 and a cross arm 2323 connected at both ends of the connecting arm 2321, and the cantilever 2322 is 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 23221 and a beam 23222, and the beam 23222 is connected to the connecting arm 2321 by a rounded transition through the root 23221. Among them, the cross arm 2323 is provided with a first protrusion 23231 protruding toward the cantilever 2322, and the beam 23222 is provided with a third protrusion 2324 protruding toward the cross arm 2323.

[0310] The pole body 231 includes a main body 2311 and an edge 2312 connected to each other. The edge 2312 is arranged around the circumference of the main body 2311. The edge 2312 is provided with a second protrusion 2313 protruding toward the cross arm 2323 and a fourth protrusion 2314 protruding toward the cantilever 2322. In 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.

[0311] The insulating sealing structure 233 includes a sealing member 2331 , a first insulating member 2332 and a second insulating member 2333 . The sealing member 2331 is a sealing ring with an L-shaped cross section. The first insulating member 2332 and the second insulating member 2333 are both injection molded parts.

[0312] Along the thickness direction of the first wall 201, the cantilever 2322 and the cross arm 2323 form a clamping groove, the cross arm 2323 is clamped on the edge portion 2312 by the sealing member 2331, and the first protrusion 23231 and the second protrusion 2313 are clamped on opposite sides of the sealing member 2331. The connecting arm 2321 and the cantilever 2322 are clamped on the edge portion 2312, and the fourth protrusion 2314 and the third protrusion 2324 are clamped on opposite sides of the first insulating member 2332. The second insulating member 2333 is wrapped around the outer peripheral side surface of the connecting arm 2321 and the cantilever 2322.

[0313] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0314] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, if there is no special description, all implementation methods and optional implementation methods of the present application can be combined with each other to form a new technical solution. If there is no special description, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The housing component comprises a first wall, wherein the first wall is provided with a mounting hole; An electrode component, housed in the housing component; A pole component is installed at the installation hole and includes a pole body, a transition structure and an insulating sealing structure, wherein the pole body is connected to the electrode component, the transition structure is arranged around the circumference of the pole body and connected to the first wall, and the insulating sealing structure is insulated and sealed between the pole body and the transition structure; In which, the transition structure includes a connecting arm, and a cantilever and a cross arm connecting the connecting arm, the cross arm is close to the first wall relative to the cantilever, and is provided with a first protrusion protruding toward the cantilever, and along the thickness direction of the first wall, the cross arm is at least provided with a position where the first protrusion is clamped together with the cantilever at the two ends of the edge of the pole body through the insulating sealing structure.

2. The battery cell according to claim 1, characterized in that: The first protrusion is arranged at an end of the cross arm away from the connecting arm.

3. The battery cell according to claim 2, characterized in that: The cross arm and the first protrusion together form an outer annular surface facing the edge portion; the insulating sealing structure includes a sealing member, and the sealing member includes a first sealing portion, and the first sealing portion is insulated and sealingly fitted between the outer annular surface and the edge portion.

4. The battery cell according to claim 3, characterized in that: The cross arm and the first protrusion together form an inner annular surface surrounding the pole body; the seal comprises a second sealing portion, which is insulated and sealingly fitted between the inner annular surface and the pole body and connected to the first sealing portion.

5. The battery cell according to any one of claims 2 to 4, characterized in that: Along the thickness direction of the first wall, the height of the cross arm is H1, and the protruding height of the first protrusion is H2, wherein 0.2≤H2 / H1≤0.

3.

6. The battery cell according to claim 1, characterized in that: The pole body comprises a main body portion and an edge portion which are connected to each other. The edge portion is arranged around the circumference of the main body portion. The edge portion is provided with a second protrusion protruding toward the cross arm.

7. The battery cell according to claim 6, characterized in that: Along the thickness direction of the connecting arm, the second protrusion and the first protrusion are staggered.

8. The battery cell according to claim 7, characterized in that: Along the thickness direction of the connecting arm, a projection of the first convex portion on the connecting arm and a projection of the second convex portion on the connecting arm partially overlap.

9. The battery cell according to any one of claims 6 to 8, characterized in that: The insulating sealing structure comprises a sealing member, and the sealing member is insulated and sealingly fitted between the pole body and the cross arm; Wherein, along the thickness direction of the first wall, a projection of the second protrusion on the first wall and a projection of the sealing member on the first wall at least partially overlap.

10. The battery cell according to claim 9, characterized in that: The projection of the second protrusion on the first wall is entirely located within the projection of the sealing member on the first wall.

11. The battery cell according to any one of claims 6 to 8, characterized in that: Along the thickness direction of the connecting arm, two opposite ends of the second protrusion are provided with transition fillets or chamfers.

12. The battery cell according to claim 1, characterized in that: The insulating sealing structure comprises a first insulating member, through which the connecting arm and the cantilever are insulatedly connected and matched with the pole body, and the cantilever is provided with a third protrusion protruding toward the cross arm.

13. The battery cell according to claim 12, characterized in that: Along the thickness direction of the first wall, the height of the cantilever is H3, and the protruding height of the third protrusion is H4, wherein 0.2≤H4 / H3≤0.

3.

14. The battery cell according to claim 12, characterized in that: The pole body comprises a main body portion and an edge portion which are connected to each other. The edge portion is arranged around the circumference of the main body portion. The edge portion is provided with a fourth protrusion protruding toward the cantilever.

15. The battery cell according to claim 14, characterized in that: Along the thickness direction of the connecting arm, the fourth protrusion and the third protrusion are staggered.

16. The battery cell according to claim 14 or 15, characterized in that: Along the thickness direction of the connecting arm, two opposite ends of the fourth protrusion are provided with transition fillets or chamfers.

17. The battery cell according to any one of claims 1 to 4, 6 to 8, and 12 to 15, characterized in that: The transition structure is an integrally formed part and includes a preformed part and a riveted formed part, the preformed part is connected to the first wall and includes the cross arm, and the riveted formed part is connected to the preformed part and includes the connecting arm and the cantilever; and / or, The transfer structure and the housing component are integrally arranged.

18. The battery cell according to any one of claims 1 to 4, 6 to 8, 12 to 15, characterized in that: 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.

19. The battery cell according to any one of claims 1 to 4, 6 to 8, and 12 to 15, characterized in that: The connecting arm is perpendicular to the first wall.

20. The battery cell according to claim 1, characterized in that The cantilever includes a root portion and a beam portion, wherein the beam portion is connected to the connecting arm with a rounded corner transition through the root portion; the insulating sealing structure includes a sealing member, which is at least partially insulated and sealingly fitted between the cross arm and the edge portion.

21. The battery cell according to claim 20, characterized in that: The beam portion is inclined or bent relative to the root portion toward a direction close to the first wall.

22. The battery cell according to claim 21, characterized in that: The included angle between the beam portion and the connecting arm is θ1, wherein 85 degrees ≤ θ1 ≤ 95 degrees.

23. The battery cell according to claim 21 or 22, characterized in that: The beam portion is provided with a third protrusion protruding toward the cross arm, and the third protrusion is inclined or bent relative to the beam portion in a direction close to the connecting arm.

24. The battery cell according to claim 23, characterized in that: The included angle between the third protrusion and the beam portion is θ2, wherein 85 degrees ≤ θ2 ≤ 95 degrees.

25. The battery cell according to claim 1, characterized in that The cantilever includes a root portion and a beam portion, wherein the root portion is in an arc shape and connects the connecting arm and the beam portion; the insulating sealing structure includes a sealing member, which is at least partially insulated and sealingly fitted between the cross arm and the edge portion.

26. The battery cell according to claim 25, characterized in that: The beam portion is inclined or bent relative to the root portion toward the first wall, and an angle between the beam portion and the connecting arm is θ3, wherein θ3<90 degrees.

27. The battery cell according to claim 26, characterized in that: 45 degrees ≤ θ3 < 90 degrees.

28. The battery cell according to any one of claims 20 to 22 and 25 to 27, characterized in that: 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 on the plane where the outer wall surface is located and the projection of the sealing member on the plane where the outer wall surface is located at least partially overlap.

29. The battery cell according to claim 1, characterized in that: 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 disturbance 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 sealing structure after compression, in N; E is the elastic module of the cross arm, in GPa; b is the circumference of the cross arm in the circumferential direction of the pole body, in mm.

30. The battery cell according to claim 1, characterized in that The insulating sealing structure comprises a sealing member and a first insulating member, wherein the sealing member is insulated and sealingly fitted between the cross arm and the edge portion, and the first insulating member is insulated and fitted between the connecting arm and the pole body, and between the cantilever and the pole body.

31. The battery cell according to claim 30, characterized in that: The sealing member and the first insulating member are integrally formed.

32. The battery cell according to claim 31, characterized in that The insulating sealing structure includes a second insulating member, and the second insulating member is coated on the outer peripheral side surfaces of the connecting arm and the cantilever.

33. The battery cell according to claim 32, characterized in that: The second insulating member, the first insulating member and the sealing member are integrally formed.

34. The battery cell according to any one of claims 30 to 33, characterized in that: The insulating sealing structure comprises a third insulating member, which is arranged on a side of the transition structure close to the electrode component and is sealed with the sealing member.

35. The battery cell according to claim 34, characterized in that: The third insulating member and the sealing member are integrally formed.

36. The battery cell according to claim 1, characterized in that The pole body comprises a main body portion and an edge portion which are connected to each other. The edge portion is arranged around the circumference of the main body portion. A gap is formed between the side of the edge portion which is away from the cantilever and the insulating sealing structure and the transition structure.

37. The battery cell according to claim 1, characterized in that The housing component comprises a housing and a cover, the housing has an opening, and the cover closes the opening; The first wall is the cover body, or is a wall of the shell body opposite to the cover body.

38. A battery device, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 37.

39. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 37, or the battery device according to claim 38, wherein the battery cell or the battery device is used for storing or providing electric energy.

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