Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell component, an electrode assembly and a pole component. The shell component comprises a first shell wall provided with a mounting hole. The electrode assembly is accommodated in the shell component. The pole component is mounted at the mounting hole and comprises a pole body, a welding ring and an insulation structure. The pole body is connected with the electrode assembly. The welding ring surrounds the pole body and overlaps the first shell wall. A welding seam is formed at the overlapping position of the welding ring and the first shell wall. The insulation structure is in insulation fit between the welding ring and the pole body. The projection of the pole body on a reference surface is spaced apart from the projection of the first shell wall on the reference surface. According to the battery monomer, the assembly gap between the pole component and the shell is small, and the compatibility of the assembly positioning tolerance is high. The welding burst point, collapse, air tightness and other problems caused by the large assembly gap can be reduced, and the welding quality of the pole component and the first shell wall is improved.

Description

Technical Field

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

[0002] In related technologies, the battery cell electrode assembly process involves setting mounting holes on the housing for installing electrode components. The electrode components are then installed into these holes and the housing is connected and fixed, thus assembling the electrode components onto the housing. However, this assembly method suffers from large assembly gaps, severely impacting the battery cell's airtightness. Furthermore, in subsequent welding processes, these large gaps can easily lead to weld bursts, collapses, and airtightness issues, reducing the welding yield of subsequent welding steps. Additionally, the assembly method in these technologies requires high precision, resulting in low compatibility with assembly positioning tolerances. Therefore, reducing the assembly gap between the electrode components and the housing and improving compatibility with assembly positioning tolerances are unresolved technical problems. Summary of the Invention

[0003] In view of the above problems, the present invention provides a battery cell, a battery device, and an electrical device. The battery cell has a small assembly gap between the terminal component and the housing and a high compatibility with assembly positioning tolerances. This can reduce problems such as welding bursts, collapses, and airtightness caused by large assembly gaps, and is conducive to improving the welding quality between the terminal component and the first housing wall and improving the welding yield of the welding process.

[0004] In a first aspect, the present invention provides a battery cell, comprising: a housing component including a first housing wall having a mounting hole; an electrode assembly housed within the housing component; and a terminal component mounted at the mounting hole and including a terminal body, a welding ring, and an insulating structure, wherein the terminal body is connected to the electrode assembly, the welding ring surrounds the terminal body and overlaps with the first housing wall, a weld is formed at the overlap of the welding ring and the first housing wall, and the insulating structure is insulated between the welding ring and the terminal body, wherein the projection of the terminal body onto a reference plane is spaced apart from the projection of the first housing wall onto a reference plane, and the reference plane is perpendicular to the thickness direction of the first housing wall.

[0005] In the above technical solution, by configuring the electrode post component as including an electrode post body, a welding ring, and an insulating structure, and by having the welding ring surround the electrode post body and connect the welding ring to the first shell wall, it is convenient to install and fix the electrode post body to the first shell wall. By having the insulating structure insulatingly fitted between the welding ring and the electrode post body, insulation isolation can be achieved between the electrode post body and the welding ring, thereby achieving insulation isolation between the electrode post body and the first shell wall. Furthermore, by having the welding ring overlap with the first shell wall, the overlapping assembly method allows a portion of the welding ring to overlap with a portion of the first shell wall, and the overlapping part to be connected and fixed. That is, the electrode post component overlaps with the first shell wall, and at the overlapping point... Compared to butt-fitting the terminal component to the first shell wall, welding allows for a smaller assembly gap between the terminal component and the shell, which helps improve the airtightness and assembly quality of the battery cell. Compared to butt-fitting assembly, it also reduces the risk of short circuits caused by component scrapers falling into the electrode assembly. Furthermore, lap-fitting assembly has lower requirements for assembly precision and is compatible with different assembly positioning tolerances. This makes it suitable for automated assembly equipment with different assembly positioning tolerances, eliminating the need to adjust the dimensions of the terminal component or mounting holes to be compatible with automated assembly equipment, thus avoiding any impact on the overall performance of the battery cell. It also reduces the purchase of equipment and helps lower production costs.

[0006] Furthermore, in the above-mentioned technical solution, a weld is formed at the overlap between the welding ring and the first shell wall. The weld is formed by welding the overlap between the welding ring and the first shell wall. Since the weld between the welding ring and the first shell wall is an overlapping fit, the assembly gap between the pole piece and the first shell wall can be smaller. This reduces problems such as welding bursts, collapses, and airtightness caused by large assembly gaps when welding the welding ring and the first shell wall. It is beneficial to improve the welding quality between the pole piece and the first shell wall and increase the welding yield of the welding process.

[0007] In some embodiments, the welding ring includes a welding ring body and a first overlapping portion, the welding ring body surrounds the pole body, and the first overlapping portion is connected to the outer periphery of the welding ring body; the first shell wall includes a connected first shell wall body and a second overlapping portion, the first overlapping portion and the second overlapping portion are overlapped and connected in the thickness direction of the first shell wall, and the weld is formed at the overlap of the first overlapping portion and the second overlapping portion.

[0008] In the above technical solution, by setting the welding ring to include a welding ring body and a first overlapping part, and the first shell wall including a connected first shell wall body and a second overlapping part, the first overlapping part and the second overlapping part are overlapped and connected in the thickness direction of the first shell wall, which facilitates the overlapping connection between the welding ring and the first shell wall, and also allows the welding ring and the first shell wall to have a large overlapping area, which is beneficial to improve the connection strength between the welding ring and the first shell wall, and also facilitates the welding connection between the first overlapping part and the second overlapping part.

[0009] In some embodiments, the first lap portion is disposed around the welding ring body, and the second lap portion is disposed around the mounting hole.

[0010] In the above technical solution, by setting the first overlapping part around the welding ring body and setting the second overlapping part around the mounting hole, the first overlapping part and the second overlapping part can be set as an annulus surrounding the pole body. This makes the connection position between the welding ring and the first shell wall an annulus surrounding the pole body, which is beneficial to increase the overlapping area between the welding ring and the first shell wall, thereby improving the connection strength between the welding ring and the first shell wall, and also improving the sealing performance of the assembly between the welding ring and the first shell wall.

[0011] In some embodiments, the first overlap is located on the side of the second overlap opposite to the electrode assembly.

[0012] In the above technical solution, by setting the first overlapping part on the side of the second overlapping part away from the electrode assembly, when assembling the electrode post component with the first housing wall, the welding ring can be placed on the first housing wall from the side of the first housing wall away from the electrode assembly, so that the first overlapping part is superimposed on the second overlapping part, which facilitates assembly.

[0013] In some embodiments, a mounting groove is formed on the side of the first housing wall opposite to the electrode assembly, at least a portion of the first overlap is accommodated in the mounting groove, and the bottom wall of the mounting groove constitutes the second overlap.

[0014] In the above technical solution, by forming an assembly groove on the side of the first shell wall away from the electrode assembly, and the bottom wall of the assembly groove forming a second overlapping part, when the first overlapping part overlaps the side of the second overlapping part away from the electrode assembly, at least part of the first overlapping part can be accommodated in the assembly groove, which can reduce the space occupied by the first overlapping part on the side of the first shell wall away from the electrode assembly, making the structure of the battery cell compact and beneficial to improving the energy density of the battery cell.

[0015] In some embodiments, the side surface of the first shell body facing away from the electrode assembly is a first surface, and the first overlapping portion does not protrude from the first surface in the direction facing away from the electrode assembly.

[0016] In the above technical solution, by ensuring that the first overlapping portion does not protrude from the side surface of the first shell wall body away from the electrode assembly, the space occupied by the first overlapping portion on the side surface of the first shell wall away from the electrode assembly can be reduced, making the structure of the battery cell compact and improving the energy density of the battery cell.

[0017] In some embodiments, the distance between the outer peripheral wall of the first overlapping portion and the inner peripheral wall of the mounting groove is d1, where d1 ≥ 0.2 mm.

[0018] In the above technical solution, by ensuring that the distance d1 between the outer peripheral wall of the first overlapping part and the inner peripheral wall of the assembly groove is ≥0.2mm, when assembling the pole post component with the first shell wall, the first overlapping part of the welding ring is installed into the assembly groove from the opening of the assembly groove along the thickness direction of the first shell wall. In this process, problems such as scraping and assembly interference caused by assembly tolerance between the first overlapping part and the inner peripheral wall of the assembly groove can be reduced. The problem of large assembly gap between the first overlapping part and the second overlapping part caused by assembly interference can be reduced, as well as the problem of welding bursts caused by large assembly gap when welding the first overlapping part and the second overlapping part.

[0019] In some embodiments, the thickness of the first overlap is less than the thickness of the second overlap.

[0020] In the above technical solution, when the first overlapping portion is located on the side of the second overlapping portion away from the electrode assembly, the thickness of the first overlapping portion is smaller than the thickness of the second overlapping portion. The thicker second overlapping portion can provide better support for the first overlapping portion. Furthermore, when the first overlapping portion and the second overlapping portion are connected by welding, the welding connection is usually performed on the side of the first shell wall away from the electrode assembly. In this way, the welding heat during the welding process penetrates from the first overlapping portion to the second overlapping portion. By making the thickness of the first overlapping portion smaller than the thickness of the second overlapping portion, it is convenient for the welding heat to penetrate from the first overlapping portion to the second overlapping portion, which can achieve better weld penetration and improve the welding connection quality between the first overlapping portion and the second overlapping portion. Moreover, since the thickness of the first overlapping portion is smaller, the welding power requirement is relatively low, reducing the high power requirement of the equipment, reducing welding energy consumption, and also making the welding thermal deformation relatively small, which is conducive to improving the welding quality.

[0021] In some embodiments, the thickness ratio of the first overlap to the second overlap is 0.3 to 0.7.

[0022] In the above technical solution, by making the thickness ratio of the first lap portion to the second lap portion 0.3 to 0.7, the second lap portion, which has a larger thickness, can provide better support for the first lap portion. When the first lap portion and the second lap portion are connected by welding, the thickness of the first lap portion can be made smaller to reduce the input of welding heat. This also allows the structural strength of the first lap portion to meet the connection strength requirements. While achieving low-power penetration, welding deformation is reduced, which can improve the welding quality of the first lap portion and the second lap portion.

[0023] In some embodiments, the thickness of the first lap joint is the same as the thickness of the weld ring body.

[0024] In the above technical solution, by making the thickness of the first overlapping part the same as the thickness of the main body of the welding ring, the structure of the welding ring can be simplified, the upsetting process of the welding ring can be eliminated, and the processing and forming process of the welding ring can be simplified.

[0025] In some embodiments, the thickness of the first lap joint is less than the thickness of the weld ring body.

[0026] In the above technical solution, by making the thickness of the first overlapping portion less than the thickness of the welding ring body, it is beneficial to reduce the mass of the welding ring, thereby improving the energy density of the battery cell. It also makes the thickness of the first overlapping portion and the second overlapping portion relatively small. Furthermore, making the thickness of the welding ring body larger allows for a larger mating area between the welding ring body and the electrode body, which is beneficial to improving the stability of the connection between the welding ring and the electrode body. In addition, when the first overlapping portion and the second overlapping portion are connected by welding, the thickness of the first overlapping portion can be made smaller to reduce the welding heat input. This achieves low-power penetration while reducing welding deformation, thereby improving the welding quality of the first overlapping portion and the second overlapping portion.

[0027] In some embodiments, the ratio of the thickness of the first lap joint to the thickness of the welding ring body is 0.3 to 0.7.

[0028] In the above technical solution, by making the ratio of the thickness of the first lap portion to the thickness of the welding ring body 0.3 to 0.7, the thicker welding ring body has a larger mating area with the pole body. When the first lap portion and the second lap portion are connected by welding, the thickness of the first lap portion can be made smaller to reduce the welding heat input. It can also better ensure that the structural strength of the first lap portion meets the requirements to meet the connection strength requirements. While achieving low-power penetration, welding deformation is reduced, which can improve the welding quality of the first lap portion and the second lap portion.

[0029] In some embodiments, the portion of the welding ring body that protrudes from the first overlapping portion in the direction close to the electrode assembly is a mating portion, which is accommodated within the mounting hole.

[0030] In the above technical solution, the thickness of the welding ring body is relatively large compared to the first overlapping part, so that the part of the welding ring body with a larger thickness that protrudes from the first overlapping part in the direction close to the electrode assembly is accommodated in the mounting hole. This can make full use of the space in the mounting hole to accommodate this part, so that the structural strength of the welding ring body is high, and the assembly structure of the welding ring and the first shell wall is compact, which is beneficial to improving the energy density of the battery cell.

[0031] In some embodiments, at least a portion of the outer peripheral wall of the mating part constitutes a positioning surface, and the distance between the positioning surface and the inner peripheral wall of the mounting hole is 0.2 mm to 0.5 mm.

[0032] In the above technical solution, by forming at least a portion of the outer peripheral wall of the mating part as a positioning surface, and making the distance between the positioning surface and the inner peripheral wall of the mounting hole 0.2mm to 0.5mm, the mating part can be accommodated in the mounting hole to make full use of the space inside the mounting hole, while reducing the risk of scratching and interference between the mating part and the second overlapping part. Furthermore, the positioning surface on the mating part can play a positioning role, which can better position and assemble the welding ring on the first shell wall.

[0033] In some embodiments, the surface of the second lap portion facing closer to the electrode assembly is the second surface, and the mating portion does not protrude from the second surface in the direction close to the electrode assembly.

[0034] In the above technical solution, by ensuring that the mating part contained in the mounting hole does not protrude from the side surface of the second overlapping part facing the electrode assembly, the additional space occupied by the mating part outside the mounting hole can be reduced. For example, the space occupied by the mating part on the side of the first housing facing the electrode assembly can be reduced, making the structure of the battery cell compact and improving the energy density of the battery cell.

[0035] In some embodiments, the ratio of the thickness of the second overlapping portion to the wall thickness of the first shell body is 0.7 to 1.2.

[0036] In the above technical solution, by making the ratio of the thickness of the second overlapping portion to the wall thickness of the first shell wall body 0.7 to 1.2, the second overlapping portion can have high structural strength. This provides better support for the first overlapping portion; and it also makes the overall wall thickness of the first shell wall more uniform, facilitating the processing and manufacturing of the first shell wall.

[0037] In some embodiments, the radial width of the second overlapping portion in the radial direction of the mounting hole is 1.9 mm to 2.9 mm.

[0038] In the above technical solution, by making the radial width of the second overlapping part in the radial direction of the mounting hole 1.9 to 2.9 mm, a larger overlapping width can be achieved between the second overlapping part and the first overlapping part, which is beneficial to improving the connection strength and connection stability between the second overlapping part and the first overlapping part; it can reduce the assembly interference problem between the welding ring and the first shell wall, and when the first overlapping part and the second overlapping part are laser welded, it reduces the risk of laser light leakage into the mounting hole and affecting other structures.

[0039] In some embodiments, in the radial direction of the mounting hole, the radial width of the second overlapping portion is W1, the overlap width between the first overlapping portion and the second overlapping portion is W2, and the ratio of W2 to W1 is 0.85 to 0.95.

[0040] In the above technical solution, by setting the ratio of the overlap width of the first overlap portion to the radial width of the second overlap portion to 0.85 to 0.95, a larger overlap width can be achieved between the second overlap portion and the first overlap portion, which is beneficial to improving the connection strength and connection stability between the second overlap portion and the first overlap portion; and, a suitable space can be reserved for the second overlap portion to reduce the risk of assembly interference between the first overlap portion and the first shell wall.

[0041] In some embodiments, in the radial direction of the mounting hole, the center line located at the middle position of the weld is the weld center line, and the distance between the weld center line and the inner peripheral wall of the second lap portion is d3, where d3 ≥ 0.5 mm.

[0042] In the above technical solution, by ensuring that the distance d3 between the center line of the weld connecting the first lap portion and the second lap portion and the inner peripheral wall of the second lap portion is ≥0.5mm, the risk of laser light leakage into the mounting hole and affecting other structures is reduced when the first lap portion and the second lap portion are laser welded.

[0043] In some embodiments, in the radial direction of the mounting hole, the center line located at the middle position of the weld is the weld center line, and the distance between the weld center line and the outer peripheral wall of the first lap portion is d4, where d4 ≥ 0.5 mm.

[0044] In the above technical solution, by making the distance between the center line of the weld connecting the first lap portion and the second lap portion and the outer peripheral wall of the first lap portion d4≥0.5mm, when the first lap portion and the second lap portion are laser welded, the laser deviation to the radial outside of the first lap portion can reduce the weld collapse and burst point that would affect the sealing performance of the battery cell, thus reducing welding defects and improving the welding quality between the first lap portion and the second lap portion.

[0045] In some embodiments, the weld is an annular shape extending circumferentially along the weld ring.

[0046] In the above technical solution, by setting the weld as an annular shape extending circumferentially along the welding ring, the welding connection area between the welding ring and the first shell wall can be larger, which can improve the connection strength and connection stability between the welding ring and the first shell wall; and it is also beneficial to improve the sealing performance of the welding connection between the welding ring and the first shell wall.

[0047] In some embodiments, the insulation structure includes a seal held between the pole body and the welding ring.

[0048] In the above technical solution, by setting the insulation structure to include a sealing element, the sealing element can seal the assembly gap between the pole body and the welding ring. Furthermore, by clamping the sealing element between the pole body and the welding ring, the clamping force and compression force on the sealing element can be enhanced. This results in higher compression strength and better compression effect of the welding ring and the pole body on the sealing element, which is beneficial to improving the sealing effect of the sealing element.

[0049] In some embodiments, the electrode body includes a first electrode portion and a second electrode portion, both of which are independently molded parts. The second electrode portion is connected to the first electrode portion and is located on the side of the welding ring away from the electrode assembly. The first electrode portion includes a first column segment and a second column segment arranged axially along the first electrode portion. The welding ring surrounds the outer periphery of the first column segment. The second column segment is located on the side of the welding ring closer to the electrode assembly and is connected to the electrode assembly. At least a portion of the seal is clamped between the second electrode segment and the welding ring.

[0050] In the above technical solution, by providing the electrode body with a first electrode portion and a second electrode portion that are independently formed, and by positioning the second electrode portion on the side of the welding ring away from the electrode assembly, when assembling the electrode body and the welding ring, the first electrode portion can be assembled with the welding ring first, and then the second electrode portion can be connected to the end of the first electrode portion away from the electrode assembly. This facilitates the assembly of the electrode body and the welding ring, and the second electrode portion can axially limit the installation of the electrode body and the welding ring, preventing the electrode body from moving towards the side closer to the electrode assembly. Furthermore, since the second electrode portion is located on the side of the welding ring away from the electrode assembly, the second electrode portion can enhance the compression effect of the welding ring on the seal, further improving the sealing effect of the seal.

[0051] Furthermore, by configuring the first electrode post portion to include a first column segment and a second column segment, and by having a seal member surround the first column segment and by clamping at least a portion of the seal member between the second column segment and the welding ring, the second column segment and the welding ring together exert a compressive force on the seal member in the axial direction of the electrode post body, which is beneficial to improving the sealing effect of the seal member. In addition, since the second electrode post portion is located on the side of the welding ring away from the electrode assembly, both the welding ring and the seal member are clamped between the second electrode post portion and the second column segment of the electrode post body. By using the electrode post body itself to compress the seal member, a stronger compressive force can be provided to the seal member, which is beneficial to further improving the sealing effect of the seal member.

[0052] In some embodiments, the welding ring includes a first welding ring and a second welding ring, both of which are independently molded parts. The first welding ring surrounds the electrode body and overlaps with the first shell wall. The second welding ring surrounds the electrode body and is connected to the first welding ring. The electrode body includes a body portion and a flange portion. The flange portion is connected to the outer peripheral wall of the body portion and is disposed around the body portion. At least a portion of the seal is clamped between the flange portion and the first welding ring. A portion of the second welding ring is located on the side of the flange portion opposite to the electrode assembly to install and fix the electrode body.

[0053] In the above technical solution, the welding ring is configured to include a first welding ring and a second welding ring, which facilitates the assembly and connection of the welding ring with the insulation structure and the electrode body. This makes the electrode component easier to manufacture and allows for easier control of the compression of the seal, thus improving sealing reliability. Furthermore, by configuring the electrode body to include a body portion and a flange portion disposed on the outer periphery of the body portion, the flange portion and the first welding ring together clamp the seal, which can apply a strong compressive force to the seal, thereby improving the sealing effect. In addition, by partially pressing the second welding ring against the side of the flange portion away from the electrode assembly, the electrode body can be easily positioned, ensuring that the electrode body is reliably installed and fixed to the first shell wall.

[0054] In some embodiments, the welding ring is made of aluminum and the first shell wall is made of steel.

[0055] In the above technical solution, by setting the welding ring as an aluminum part, the processing and forming of the welding ring is facilitated, and the processing and forming process of the welding ring is less restricted. For example, the welding ring can be formed by stamping. By setting the first shell wall as a steel part, the first shell wall can have better structural strength and hardness, which is beneficial to reducing the deformation of the first shell wall. Since it is difficult to directly stamp the steel first shell wall to form a chamfered structure for assembly guidance with the welding ring, if the assembly method of the pole component and the shell in related technologies is adopted, the assembly gap between the first shell wall and the welding ring needs to be increased. This will affect and reduce the welding quality of the first shell wall and the welding ring, leading to weld failure. By using a welded lap joint connection method for the first shell wall and the welding ring, it is not necessary to process a chamfered structure for assembly guidance on the first shell wall, and the assembly gap between the first shell wall and the welding ring can be smaller, which is beneficial to improving the welding quality between the first shell wall and the welding ring.

[0056] In some embodiments, at least one of the welding ring and the first shell wall is a stamped part.

[0057] In the above technical solution, by making at least one of the welding ring and the first shell wall a stamped part, the stamping process is relatively mature, which is conducive to reducing the processing cost of the welding ring and / or the first shell wall. Moreover, the workpiece formed by the stamping process has higher structural strength, which also makes the welding ring and / or the first shell wall have higher structural strength. Furthermore, compared with the workpiece formed by milling and other processes, the workpiece formed by the stamping process can reduce the risk of defective products such as milling burrs and steel wires, which is conducive to improving the incoming material yield of the welding ring and / or the first shell wall.

[0058] In a second aspect, the present invention provides a battery device comprising: a housing; and a battery cell according to the first aspect embodiment described above, disposed within the housing.

[0059] In the above technical solution, by setting the above-mentioned battery cell, the airtightness and assembly quality of the battery cell are high, which is conducive to improving the performance of the battery device. Furthermore, the assembly method of the terminal component of the battery cell can be compatible with automatic assembly equipment with different assembly positioning tolerances, which is conducive to reducing production costs.

[0060] Thirdly, the present invention provides an electrical device including a battery device according to the second aspect embodiment described above.

[0061] In the above technical solution, by setting the above battery device, the airtightness and assembly quality of the battery cells in the battery device are high, which is conducive to improving the performance of the battery device. Furthermore, the assembly method of the terminal components of the battery cells can be compatible with automatic assembly equipment with different assembly positioning tolerances, which is conducive to reducing production costs.

[0062] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0063] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0064] Figure 1 This is a perspective view of a battery cell according to some embodiments of the present invention;

[0065] Figure 2 yes Figure 1 A cross-sectional view of a single battery cell in the diagram;

[0066] Figure 3 yes Figure 1 A top view of a single battery cell;

[0067] Figure 4 It is along Figure 3 Cross-sectional view of the CC line;

[0068] Figure 5 yes Figure 4 A simplified diagram showing a partial assembly of the welding ring and the first shell wall;

[0069] Figure 6 This is a schematic diagram of the assembly of the welding ring of a battery cell with the first shell wall according to other embodiments of the present invention;

[0070] Figure 7 yes Figure 6 A simplified diagram showing a partial assembly of the welding ring and the first shell wall;

[0071] Figure 8 This is a schematic diagram of the assembly of the welding ring of a battery cell with the first shell wall according to some embodiments of the present invention;

[0072] Figure 9 This is a schematic diagram of a battery device according to some embodiments of the present invention;

[0073] Figure 10 This is a schematic diagram of an electrical device according to some embodiments of the present invention.

[0074] Figure label:

[0075] 1000. Electrical appliances;

[0076] 200. Battery device;

[0077] 100. Battery cell;

[0078] 10. Housing components;

[0079] 20. First shell wall; 21. Mounting hole; 22. Assembly groove; 23. Main body of first shell wall; 231. First surface; 24. Second overlapping part; 241. Second surface;

[0080] 30. Pole post component; 31. Pole post body; 311. First pole post portion; 3111. First pole segment; 3112. Second pole segment; 312. Second pole post portion; 313. Body portion; 314. Flange portion; 32. Insulation structure; 321. Seal; 33. Welding ring; 331. Welding ring body; 332. Mating portion; 333. Positioning surface; 334. First overlapping portion; 335. First welding ring; 336. Second welding ring;

[0081] 40. Weld; f. Weld centerline;

[0082] 50. Electrode assembly; 51. Electrode body; 52. Electrode tab;

[0083] 60. Box body;

[0084] 300. Vehicle body. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0086] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order or hierarchy.

[0087] In this invention, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0088] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0089] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0090] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present invention shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on the present invention.

[0091] In this invention, "multiple" refers to two or more (including two).

[0092] In the embodiments of the present invention, unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0093] In the embodiments of the present invention, unless otherwise specified, all technical features and optional technical features of the present invention can be combined with each other to form new technical solutions.

[0094] In embodiments of the present invention, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple battery cells; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module may be formed by bundling multiple battery cells together with cable ties.

[0095] The battery device can be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. The individual battery cells can be battery modules, which can be housed within the housing by securing the battery modules to the housing; alternatively, multiple individual battery cells can be directly secured to the housing.

[0096] In embodiments of the present invention, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing for housing individual battery cells.

[0097] In embodiments of the present invention, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0098] In this embodiment of the invention, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment of the invention is not limited to these types. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this embodiment of the invention is not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this embodiment of the invention is not limited to these types either.

[0099] A battery cell, as the smallest energy unit of a battery device, includes a casing and electrode assemblies disposed within the casing. The electrode assemblies are the components within the battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. Electrode assemblies are mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab.

[0100] The positive electrode sheet may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material.

[0101] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0102] As an example, the positive current collector can be a metal foil or a composite current collector.

[0103] The negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer including a negative electrode active material.

[0104] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0105] As an example, the negative electrode current collector can be made of metal foil, foam metal, or composite current collector.

[0106] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0107] In related technologies, the battery cell electrode assembly process involves setting mounting holes on the housing for installing electrode components. The electrode components are then installed into these holes and the housing is connected and fixed, thus assembling the electrode components onto the housing. However, this assembly method suffers from large assembly gaps, severely impacting the battery cell's airtightness. Furthermore, in subsequent welding processes, these large gaps can easily lead to weld bursts, collapses, and airtightness issues, reducing the welding yield of subsequent welding steps. Additionally, the assembly method in these technologies requires high precision, resulting in low compatibility with assembly positioning tolerances. Therefore, reducing the assembly gap between the electrode components and the housing and improving compatibility with assembly positioning tolerances are unresolved technical problems.

[0108] Based on this, the present invention proposes a battery cell, which includes: a housing component, an electrode assembly, and a terminal post component. The housing component includes a first housing wall with a mounting hole. The electrode assembly is housed within the housing component. The terminal post component is mounted at the mounting hole and includes a terminal post body, a welding ring, and an insulating structure. The terminal post body is connected to the electrode assembly. The welding ring surrounds the terminal post body and overlaps with the first housing wall. A weld is formed at the overlap between the welding ring and the first housing wall. The insulating structure is insulatingly fitted between the welding ring and the terminal post body. The projection of the terminal post body onto a reference plane is spaced apart from the projection of the first housing wall onto the reference plane. The reference plane is perpendicular to the thickness direction of the first housing wall.

[0109] In the aforementioned battery cell, the terminal assembly includes a terminal body, a welding ring, and an insulating structure. By having the welding ring surround the terminal body and connect it to the first shell wall, the terminal body can be easily installed and fixed to the first shell wall. The insulating structure, insulated between the welding ring and the terminal body, provides insulation between them, thus achieving insulation between the terminal body and the first shell wall. Furthermore, by having the welding ring overlap the first shell wall, this overlapping assembly allows a portion of the welding ring to overlap with a portion of the first shell wall, with the overlap point connected and fixed. This means the terminal assembly overlaps with the first shell wall, and at the overlap point... Compared to butt-fitting the terminal component to the first shell wall, welding allows for a smaller assembly gap between the terminal component and the shell, which helps improve the airtightness and assembly quality of the battery cell. Compared to butt-fitting assembly, it also reduces the risk of short circuits caused by component scrapers falling into the electrode assembly. Furthermore, lap-fitting assembly has lower requirements for assembly precision and is compatible with different assembly positioning tolerances. This makes it suitable for automated assembly equipment with different assembly positioning tolerances, eliminating the need to adjust the dimensions of the terminal component or mounting holes to be compatible with automated assembly equipment, thus avoiding any impact on the overall performance of the battery cell. It also reduces the purchase of equipment and helps lower production costs.

[0110] Furthermore, in the above-mentioned technical solution, a weld is formed at the overlap between the welding ring and the first shell wall. The weld is formed by welding the overlap between the welding ring and the first shell wall. Since the weld between the welding ring and the first shell wall is an overlapping fit, the assembly gap between the pole piece and the first shell wall can be smaller. This reduces problems such as welding bursts, collapses, and airtightness caused by large assembly gaps when welding the welding ring and the first shell wall. It is beneficial to improve the welding quality between the pole piece and the first shell wall and increase the welding yield of the welding process.

[0111] The battery device disclosed in this invention can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. Besides vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0112] The electrical device disclosed in this invention can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this invention, the battery device can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0113] The following is for reference. Figures 1-8 A battery cell 100 according to an embodiment of the present invention is described.

[0114] refer to Figures 1-3 In a first aspect, the present invention provides a battery cell 100, comprising: a housing component 10, an electrode assembly 50, and a terminal post component 30. The housing component 10 includes a first housing wall 20, on which a mounting hole 21 is provided. The electrode assembly 50 is accommodated within the housing component 10. The terminal post component 30 is mounted at the mounting hole 21 and includes a terminal post body 31, a welding ring 33, and an insulating structure 32. The terminal post body 31 is connected to the electrode assembly 50. The welding ring 33 surrounds the terminal post body 31 and overlaps with the first housing wall 20. A weld 40 is formed at the overlap between the welding ring 33 and the first housing wall 20. The insulating structure 32 is insulatingly fitted between the welding ring 33 and the terminal post body 31. The projection of the terminal post body 31 onto a reference plane is spaced apart from the projection of the first housing wall 20 onto a reference plane. The reference plane is perpendicular to the thickness direction of the first housing wall 20.

[0115] The first shell wall 20 can be an end cap. For example, the first shell wall 20 can also be provided with a pressure relief structure and a liquid injection hole. The shell component 10 can include a main shell and a first shell wall 20, with one side of the main shell open and the first shell wall 20 covering the open side of the main shell.

[0116] The battery cell 100 can be cuboid, and the first shell wall 20 can be rectangular. The length direction of the first shell wall 20 can be referred to as the e1 direction in the attached figure. The length direction of the first shell wall 20 can be consistent with the length direction of the battery cell 100. The width direction of the first shell wall 20 can be referred to as the e3 direction in the attached figure. The width direction of the first shell wall 20 can be consistent with the thickness direction of the battery cell 100.

[0117] The electrode assembly 50 may include one or more electrode groups. The electrode assembly 50 may include an electrode body 51 and tabs 52. The tabs 52 are connected to one side of the electrode body 51; for example, both the positive and negative tabs 52 are connected to one side of the electrode body 51 along a second direction. The tabs 52 are connected to the electrode post body 31 to achieve electrical connection between the electrode assembly 50 and the electrode post body 31. The second direction can refer to direction e2 in the accompanying drawings, and can be the height direction of the battery cell 100 or the thickness direction of the first shell wall 20.

[0118] For example, the first shell wall 20 is provided with two mounting holes 21, which can be arranged along the length of the first shell wall 20. There are two pole post components 30, one of which is a positive pole and the other is a negative pole. One pole post component 30 is installed at one of the mounting holes 21, and the other pole post component 30 is installed at the other mounting hole 21.

[0119] For example, refer to Figure 3 The welding ring 33 can be racetrack-shaped, elliptical, or rectangular. The welding ring 33 serves to mount and fix the pole post component 30 to the first housing wall 20. Both the first housing wall 20 and the welding ring 33 can be metal parts.

[0120] The projection of the pole body 31 onto the reference plane is spaced apart from the projection of the first shell wall 20 onto the reference plane. The reference plane is perpendicular to the thickness direction of the first shell wall 20, which can be referred to as direction e2 in the attached figure. Thus, the projections of the pole body 31 and the first shell wall 20 onto the thickness direction of the first shell wall 20 do not overlap. When installing the pole component 30, the pole body 31, the insulating structure 32, and the welding ring 33 can be assembled first to form an integral pole component 30, and then the pole component 30 can be assembled entirely onto the first shell wall 20. When assembling the pole component 30 entirely onto the first shell wall 20, only the welding ring 33 of the pole component 30 needs to be welded to the first shell wall 20. There is no direct connection between the insulating structure 32 in the pole component 30 and the first shell wall 20, which facilitates the installation of the pole component 30 onto the first shell wall 20.

[0121] The weld 40 is formed at the overlap between the welding ring 33 and the first shell wall 20 through a welding process, and the welding ring 33 and the first shell wall 20 are welded together at the overlap. For example, the weld 40 can be formed at the overlap between the welding ring 33 and the first shell wall 20 by laser welding.

[0122] In the above technical solution, by configuring the pole piece 30 to include a pole piece body 31, a welding ring 33, and an insulating structure 32, and by having the welding ring 33 surround the pole piece body 31 and connect the welding ring 33 to the first shell wall 20, it is convenient to install and fix the pole piece body 31 to the first shell wall 20. By having the insulating structure 32 insulatingly fitted between the welding ring 33 and the pole piece body 31, insulation isolation can be achieved between the pole piece body 31 and the welding ring 33, thereby achieving insulation isolation between the pole piece body 31 and the first shell wall 20. Furthermore, by having the welding ring 33 overlap with the first shell wall 20, the overlapping assembly method allows a portion of the welding ring 33 to overlap with a portion of the first shell wall 20, and the overlapping part to be connected and fixed, that is, the pole piece 30... By overlapping and welding the terminal post 30 with the first housing wall 20, compared to the butt-fitting method, the assembly gap between the terminal post 30 and the housing is smaller, which helps to improve the airtightness and assembly quality of the battery cell 100. Compared with the butt-fitting method, it can also reduce the risk of short circuit caused by the component scraper falling into the electrode assembly 50. Furthermore, the overlapping assembly method has lower requirements for assembly precision and can be compatible with different assembly positioning tolerances. This makes it suitable for automatic assembly equipment with different assembly positioning tolerances. It does not require adjusting the size of the terminal post 30 or the mounting hole 21 to be compatible with automatic assembly equipment, which would affect the overall performance of the battery cell 100. It can also reduce the purchase of equipment and help reduce production costs.

[0123] Furthermore, in the above technical solution, a weld 40 is formed at the overlap of the welding ring 33 and the first shell wall 20. The weld 40 is formed by welding the overlap of the welding ring 33 and the first shell wall 20. Since the weld position of the welding ring 33 and the first shell wall 20 is an overlapping fit, the assembly gap between the pole post component 30 and the first shell wall 20 can be smaller. In this way, when welding the welding ring 33 and the first shell wall 20, problems such as welding bursts, collapses, and airtightness caused by large assembly gaps can be reduced. This is beneficial to improving the welding quality of the pole post component 30 and the first shell wall 20 and improving the welding yield of the welding process.

[0124] In some embodiments, refer to Figure 3 and Figure 4 The welding ring 33 includes a welding ring body 331 and a first overlapping portion 334. The welding ring body 331 surrounds the pole body 31, and the first overlapping portion 334 is connected to the outer periphery of the welding ring body 331. The first shell wall 20 includes a connected first shell wall body 23 and a second overlapping portion 24. The first overlapping portion 334 and the second overlapping portion 24 are overlapped and connected in the thickness direction of the first shell wall 20, and a weld 40 is formed at the overlap of the first overlapping portion 334 and the second overlapping portion 24.

[0125] For example, when the pole post component 30 is welded to the first housing wall 20, the assembly process of the pole post component 30 and the first housing wall 20 can be as follows:

[0126] The pole piece 30 is snapped into the mounting hole 21 on the first housing wall 20;

[0127] The pole post component 30 and the first shell wall 20 are pressed together by pressing the cover plate, so that there is no gap or a very small gap between the second overlapping part 24 and the first overlapping part 334.

[0128] The second lap joint 24 is pre-welded to the first lap joint 334;

[0129] Remove the press-fit cover plate, and fully weld the second lap portion 24 to the first lap portion 334;

[0130] The first shell wall 20, on which the pole post component 30 is installed, is welded to the main shell, and then a sealing test is performed.

[0131] In the above technical solution, by setting the welding ring 33 to include a welding ring body 331 and a first overlapping portion 334, and the first shell wall 20 to include a connected first shell wall body 23 and a second overlapping portion 24, the first overlapping portion 334 and the second overlapping portion 24 are overlapped and connected in the thickness direction of the first shell wall 20, which facilitates the overlapping connection between the welding ring 33 and the first shell wall 20, and also allows the welding ring 33 and the first shell wall 20 to have a large overlapping area, which is beneficial to improving the connection strength between the welding ring 33 and the first shell wall 20.

[0132] In some embodiments, refer to Figures 2-4 The first lap joint 334 is arranged around the welding ring body 331, and the second lap joint 24 is arranged around the mounting hole 21.

[0133] The first lap joint 334 is annular, and the annular first lap joint 334 is arranged around the welding ring body 331.

[0134] The second overlapping portion 24 is annular, and the annular second overlapping portion 24 is arranged around the mounting hole 21. The mounting hole 21 is defined by the inner circumference of the second overlapping portion 24.

[0135] In the above technical solution, by setting the first overlapping part 334 around the welding ring body 331 and setting the second overlapping part 24 around the mounting hole 21, the first overlapping part 334 and the second overlapping part 24 can be set as an annulus surrounding the pole body 31. This makes the connection position between the welding ring 33 and the first shell wall 20 annulus surrounding the pole body 31, which is beneficial to increase the overlapping area between the welding ring 33 and the first shell wall 20, thereby improving the connection strength between the welding ring 33 and the first shell wall 20, and also improving the sealing performance of the assembly between the welding ring 33 and the first shell wall 20.

[0136] In some embodiments, refer to Figures 2-4 The first overlap portion 334 is located on the side of the second overlap portion 24 opposite to the electrode assembly 50.

[0137] In the above technical solution, by setting the first overlapping part 334 on the side of the second overlapping part 24 away from the electrode assembly 50, when assembling the pole member 30 with the first housing wall 20, the welding ring 33 can be placed on the first housing wall 20 from the side of the first housing wall 20 away from the electrode assembly 50, so that the first overlapping part 334 is stacked on the second overlapping part 24, which facilitates assembly.

[0138] In some embodiments, refer to Figures 2-4 A mounting groove 22 is formed on the side of the first shell wall 20 away from the electrode assembly 50. At least a portion of the first overlapping portion 334 is accommodated in the mounting groove 22, and the bottom wall of the mounting groove 22 constitutes the second overlapping portion 24.

[0139] At least a portion of the first overlapping portion 334 is accommodated in the mounting groove 22. This can be done by accommodating a portion of the first overlapping portion 334 in the mounting groove 22, or by accommodating all of the first overlapping portion 334 in the mounting groove 22.

[0140] The mounting groove 22 is provided around the mounting hole 21 and communicates with the mounting hole 21.

[0141] A portion of the first housing wall 20 may be recessed toward the electrode assembly 50, so that an assembly groove 22 is formed on the side of the first housing wall 20 opposite to the electrode assembly 50.

[0142] In the above technical solution, by forming an assembly groove 22 on the side of the first shell wall 20 away from the electrode assembly 50, and the bottom wall of the assembly groove 22 forming a second overlapping part 24, when the first overlapping part 334 overlaps the side of the second overlapping part 24 away from the electrode assembly 50, at least a portion of the first overlapping part 334 can be accommodated in the assembly groove 22, which can reduce the space occupied by the first overlapping part 334 on the side of the first shell wall 20 away from the electrode assembly 50, making the structure of the battery cell 100 compact and improving the energy density of the battery cell 100.

[0143] In some embodiments, refer to Figures 4-5 The side surface of the first shell body 23 facing away from the electrode assembly 50 is the first surface 231. In the direction facing away from the electrode assembly 50, the first overlapping part 334 does not protrude from the first surface 231.

[0144] In the above technical solution, by ensuring that the first overlapping part 334 does not protrude from the side surface of the first shell wall body 23 away from the electrode assembly 50, the space occupied by the first overlapping part 334 on the side of the first shell wall 20 away from the electrode assembly 50 can be better reduced, making the structure of the battery cell 100 more compact and improving the energy density of the battery cell 100.

[0145] In some embodiments, refer to Figures 4-5 The distance between the outer peripheral wall of the first overlapping part 334 and the inner peripheral wall of the assembly groove 22 is d1, where d1 ≥ 0.2 mm.

[0146] For example, the distance d1 between the outer peripheral wall of the first overlapping part 334 and the inner peripheral wall of the mounting groove 22 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0147] In the above technical solution, by ensuring that the distance d1 between the outer peripheral wall of the first overlapping part 334 and the inner peripheral wall of the mounting groove 22 is ≥0.2mm, when assembling the pole post component 30 with the first shell wall 20, the first overlapping part 334 of the welding ring 33 is installed into the mounting groove 22 from the opening of the mounting groove 22 along the thickness direction of the first shell wall 20. In this process, problems such as scraping and assembly interference caused by assembly tolerance between the first overlapping part 334 and the inner peripheral wall of the mounting groove 22 can be reduced. The large assembly gap between the first overlapping part 334 and the second overlapping part 24 caused by assembly interference can be reduced, as well as the welding bursts caused by the large assembly gap during welding of the first overlapping part 334 and the second overlapping part 24.

[0148] In some embodiments, refer to Figures 4-5 The thickness of the first overlapping portion 334 is less than the thickness of the second overlapping portion 24.

[0149] For example, refer to Figure 5 The thickness of the first overlapping part 334 is t1, and the thickness of the second overlapping part 24 is t2, where t1 is less than t2.

[0150] In the above technical solution, when the first overlapping portion 334 is located on the side of the second overlapping portion 24 away from the electrode assembly 50, the thickness of the first overlapping portion 334 is less than the thickness of the second overlapping portion 24. The thicker second overlapping portion 24 can provide better support for the first overlapping portion 334. Furthermore, when the first overlapping portion 334 and the second overlapping portion 24 are connected by welding, the welding connection is usually performed on the side of the first shell wall 20 away from the electrode assembly 50. In this way, the welding heat during the welding process is transferred from... The first lap portion 334 penetrates into the second lap portion 24. By making the thickness of the first lap portion 334 smaller than that of the second lap portion 24, it is easier for welding heat to penetrate from the first lap portion 334 to the second lap portion 24, resulting in better weld penetration and improving the weld connection quality between the first lap portion 334 and the second lap portion 24. Furthermore, since the thickness of the first lap portion 334 is smaller, the welding power requirement is relatively lower, reducing the need for high-power equipment, reducing welding energy consumption, and also resulting in relatively smaller welding thermal deformation, which is beneficial to improving welding quality.

[0151] In some embodiments, refer to Figures 4-5 The thickness ratio of the first overlapping portion 334 to the second overlapping portion 24 is 0.3 to 0.7.

[0152] For example, the thickness of the first overlapping portion 334 is t1, the thickness of the second overlapping portion 24 is t2, and the ratio of t1 to t2 is 0.3 to 0.7. For example, the ratio of t1 to t2 can be 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0153] In the above technical solution, by making the thickness ratio of the first overlapping portion 334 to the second overlapping portion 24 0.3 to 0.7, the second overlapping portion 24, which has a larger thickness, can provide better support for the first overlapping portion 334. When the first overlapping portion 334 and the second overlapping portion 24 are connected by welding, the thickness of the first overlapping portion 334 can be made smaller to reduce the input of welding heat. This also ensures that the structural strength of the first overlapping portion 334 meets the requirements for connection strength. While achieving low-power penetration, welding deformation is reduced, which can improve the welding quality of the first overlapping portion 334 and the second overlapping portion 24.

[0154] In some embodiments, refer to Figures 4-5 The thickness of the first lap joint 334 is the same as the thickness of the welding ring body 331.

[0155] For example, refer to Figure 5 The thickness of the first lap joint 334 is t1, and the thickness of the welding ring body 331 is t3. The values ​​of t1 and t3 are the same.

[0156] In the above technical solution, by making the thickness of the first overlapping part 334 the same as the thickness of the welding ring body 331, the structure of the welding ring 33 can be simplified, the thinning process of the welding ring 33 can be eliminated, and the processing and forming process of the welding ring 33 can be simplified.

[0157] In some embodiments, refer to Figures 6-7 The thickness of the first lap joint 334 is less than the thickness of the main body of the welding ring 331.

[0158] For example, refer to Figure 7 The thickness of the first lap joint 334 is t1, and the thickness of the welding ring body 331 is t3, where t1 is less than t3.

[0159] In the above technical solution, by making the thickness of the first overlapping portion 334 less than the thickness of the welding ring body 331, it is beneficial to reduce the mass of the welding ring 33, thereby improving the energy density of the battery cell 100. It also makes the thickness of the first overlapping portion 334 and the second overlapping portion 24 stacked relatively small. Furthermore, making the thickness of the welding ring body 331 larger allows for a larger mating area between the welding ring body 331 and the electrode body 31, which is beneficial to improving the stability of the mating connection between the welding ring 33 and the electrode body 31. In addition, when the first overlapping portion 334 and the second overlapping portion 24 are connected by welding, the thickness of the first overlapping portion 334 can be made smaller to reduce the welding heat input. While achieving low-power penetration, welding deformation is reduced, which can improve the welding quality of the first overlapping portion 334 and the second overlapping portion 24.

[0160] In some embodiments, refer to Figures 6-7 The ratio of the thickness of the first overlapping part 334 to the thickness of the welding ring body 331 is 0.3 to 0.7.

[0161] For example, the thickness of the first lap joint 334 is t1, and the thickness of the welding ring body 331 is t3, with the ratio of t1 to t3 being 0.3 to 0.7. For example, the ratio of t1 to t3 can be 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0162] In the above technical solution, by making the ratio of the thickness of the first overlapping part 334 to the thickness of the welding ring body 331 0.3 to 0.7, the welding ring body 331 with a larger thickness has a larger mating area with the pole body 31. When the first overlapping part 334 and the second overlapping part 24 are connected by welding, the thickness of the first overlapping part 334 can be made smaller to reduce the welding heat input. It can also better ensure that the structural strength of the first overlapping part 334 meets the requirements to meet the connection strength requirements. While achieving low-power welding penetration, welding deformation is reduced, which can improve the welding quality of the first overlapping part 334 and the second overlapping part 24.

[0163] In some embodiments, refer to Figures 6-7 The portion of the welding ring body 331 that protrudes from the first overlapping portion 334 in the direction close to the electrode assembly 50 is the mating portion 332, which is accommodated in the mounting hole 21.

[0164] In the above technical solution, the thickness of the welding ring body 331 is relatively large compared to the first overlapping part 334. This allows the portion of the thicker welding ring body 331 that protrudes from the first overlapping part 334 in the direction close to the electrode assembly 50 to be accommodated in the mounting hole 21. This makes full use of the space in the mounting hole 21 to accommodate this portion, resulting in high structural strength of the welding ring body 331 and a compact assembly structure between the welding ring 33 and the first shell wall 20, which is beneficial to improving the energy density of the battery cell.

[0165] In some embodiments, refer to Figures 6-7 At least a portion of the outer peripheral wall of the mating part 332 constitutes a positioning surface 333, and the distance between the positioning surface 333 and the inner peripheral wall of the mounting hole 21 is 0.2 mm to 0.5 mm.

[0166] At least a portion of the outer peripheral wall of the mating part 332 constitutes a positioning surface 333, for example, all of the outer peripheral walls of the mating part 332 constitute a positioning surface 333.

[0167] For example, refer to Figure 7 The distance between the positioning surface 333 and the inner peripheral wall of the mounting hole 21 is d2. The distance d2 between the positioning surface 333 and the inner peripheral wall of the mounting hole 21 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0168] In the above technical solution, by forming at least a portion of the outer peripheral wall of the mating part 332 into a positioning surface 333, and making the distance between the positioning surface 333 and the inner peripheral wall of the mounting hole 21 0.2mm to 0.5mm, the mating part 332 is accommodated in the mounting hole 21 to make full use of the space inside the mounting hole 21, while reducing the risk of scratching or interference between the mating part 332 and the second overlapping part 24. Furthermore, the positioning surface 333 on the mating part 332 can play a positioning role, which can better position and assemble the welding ring 33 onto the first shell wall 20.

[0169] In some embodiments, refer to Figures 6-7 The surface of the second overlapping portion 24 facing the side close to the electrode assembly 50 is the second surface 241. In the direction close to the electrode assembly 50, the mating portion 332 does not protrude from the second surface 241.

[0170] In the above technical solution, by ensuring that the mating part 332 contained in the mounting hole 21 does not protrude from the side surface of the second overlapping part 24 facing the electrode assembly 50, the additional space occupied by the mating part 332 outside the mounting hole 21 can be reduced. For example, the space occupied by the mating part 332 on the side of the first housing facing the electrode assembly 50 can be reduced, making the structure of the battery cell 100 compact and improving the energy density of the battery cell 100.

[0171] In some embodiments, refer to Figures 4-5 The ratio of the thickness of the second overlapping part 24 to the wall thickness of the first shell body 23 is 0.7 to 1.2.

[0172] For example, the thickness of the second overlapping part 24 is t2, the wall thickness of the first shell body 23 is t4, and the ratio of t2 to t4 is 0.7 to 1.2. For example, the ratio of t2 to t4 can be 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0173] In the above technical solution, by making the ratio of the thickness of the second overlapping portion 24 to the wall thickness of the first shell wall body 23 0.7 to 1.2, the second overlapping portion 24 can have high structural strength. This provides better support for the first overlapping portion 334; and makes the overall wall thickness of the first shell wall 20 more uniform, which facilitates the processing and manufacturing of the first shell wall 20.

[0174] In some embodiments, refer to Figures 4-5 The radial width of the second overlapping part 24 in the radial direction of the mounting hole 21 is 1.9mm to 2.9mm.

[0175] For example, the radial width of the second overlapping portion 24 in the radial direction of the mounting hole 21 is W1, and the radial width W1 of the second overlapping portion 24 in the radial direction of the mounting hole 21 can be 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, etc.

[0176] In the above technical solution, by making the radial width of the second overlapping part 24 in the radial direction of the mounting hole 21 1.9 to 2.9 mm, the second overlapping part 24 and the first overlapping part 334 can have a large overlapping width, which is beneficial to improving the connection strength and connection stability between the second overlapping part 24 and the first overlapping part 334; it can reduce the assembly interference problem between the welding ring 33 and the first shell wall 20, and when the first overlapping part 334 and the second overlapping part 24 are laser welded, it reduces the risk of laser light leakage into the mounting hole 21 and affecting other structures.

[0177] In some embodiments, refer to Figures 4-5In the radial direction of the mounting hole 21, the radial width of the second overlapping portion 24 is W1, the overlap width of the first overlapping portion 334 and the second overlapping portion 24 is W2, and the ratio of W2 to W1 is 0.85 to 0.95.

[0178] For example, the ratio of W2 to W1 can be 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, etc.

[0179] In the above technical solution, by setting the ratio of the overlap width of the first overlap portion 334 and the second overlap portion 24 to the radial width of the second overlap portion 24 to 0.85 to 0.95, a larger overlap width can be achieved between the second overlap portion 24 and the first overlap portion 334, which is beneficial to improving the connection strength and connection stability between the second overlap portion 24 and the first overlap portion 334; and, a suitable space can be reserved for the second overlap portion 24 to reduce the risk of assembly interference between the first overlap portion 334 and the first shell wall 20.

[0180] In some embodiments, refer to Figures 4-5 In the radial direction of the mounting hole 21, the center line located in the middle of the weld 40 is the weld center line f, and the distance between the weld center line f and the inner peripheral wall of the second lap part 24 is d3, where d3 ≥ 0.5 mm.

[0181] For example, the distance d3 between the weld centerline f and the inner peripheral wall of the second lap joint 24 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0182] In the above technical solution, by ensuring that the distance d3 between the center line of the weld 40 connecting the first lap portion 334 and the second lap portion 24 and the inner peripheral wall of the second lap portion 24 is ≥0.5mm, when the first lap portion 334 and the second lap portion 24 are laser welded, the risk of laser light leakage into the mounting hole 21 and affecting other structures is reduced.

[0183] In some embodiments, refer to Figures 4-5 In the radial direction of the mounting hole 21, the center line located in the middle of the weld 40 is the weld center line f, and the distance between the weld center line f and the outer peripheral wall of the first lap part 334 is d4, where d4 ≥ 0.5 mm.

[0184] For example, the distance d4 between the weld centerline f and the outer peripheral wall of the first lap joint 334 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0185] In the above technical solution, by making the distance between the center line of the weld 40 connecting the first overlapping part 334 and the second overlapping part 24 and the outer peripheral wall of the first overlapping part 334 ≥ 0.5 mm, when the first overlapping part 334 and the second overlapping part 24 are laser welded, the laser deviation to the radial outside of the first overlapping part 334 can be reduced, which may cause weld collapse and bursting points and affect the sealing performance of the battery cell 100. This is beneficial to reduce welding defects and improve the welding quality between the first overlapping part 334 and the second overlapping part 24.

[0186] In some embodiments, the weld 40 is an annular shape extending circumferentially along the weld ring 33.

[0187] In the above technical solution, by setting the weld 40 as an annular shape extending circumferentially along the weld ring 33, the welding connection area between the weld ring 33 and the first shell wall 20 can be larger, which can improve the connection strength and connection stability between the weld ring 33 and the first shell wall 20; and it is also beneficial to improve the sealing performance of the welding connection between the weld ring 33 and the first shell wall 20.

[0188] In some embodiments, refer to Figures 4-8 The insulation structure 32 includes a seal 321, which is clamped between the pole body 31 and the welding ring 33.

[0189] The sealing element 321 can be an annular structure surrounding the pole body 31. The sealing element 321 can be a flexible element or have elastic deformation capability.

[0190] In the above technical solution, by setting the insulation structure 32 to include a sealing element 321, the sealing element 321 can seal the assembly gap between the pole body 31 and the welding ring 33. Furthermore, by clamping the sealing element 321 between the pole body 31 and the welding ring 33, the clamping force and compression force on the sealing element 321 can be enhanced. This results in higher compression strength and better compression effect of the welding ring 33 and the pole body 31 on the sealing element 321, which is beneficial to improving the sealing effect of the sealing element 321.

[0191] In some embodiments, refer to Figures 4-7The electrode body 31 includes a first electrode portion 311 and a second electrode portion 312. The second electrode portion 312 and the first electrode portion 311 are both independently molded parts. The second electrode portion 312 is connected to the first electrode portion 311, and the second electrode portion 312 is located on the side of the welding ring 33 away from the electrode assembly 50. The first electrode portion 311 includes a first column segment 3111 and a second column segment 3112 arranged along the axial direction of the first electrode portion 311. The welding ring 33 surrounds the outer periphery of the first column segment 3111. The second column segment 3112 is located on the side of the welding ring 33 close to the electrode assembly 50, and the second column segment 3112 is connected to the electrode assembly 50. At least a portion of the sealing member 321 is sandwiched between the second column segment 3112 and the welding ring 33.

[0192] The fact that at least a portion of the seal 321 is sandwiched between the second column segment 3112 and the welding ring 33 may include the following situations: for example, a portion of the seal 321 may be sandwiched between the second column segment 3112 and the welding ring 33, while another portion of the seal 321 is located between the welding ring 33 and the first column segment 3111; or, for another example, the entire seal 321 may be sandwiched between the second column segment 3112 and the welding ring 33, and the welding ring 33 and the first column segment 3111 may be insulated from each other by the insulating structure 32 other than the seal 321.

[0193] In the above technical solution, by providing the electrode body 31 with a first electrode portion 311 and a second electrode portion 312 that are respectively formed independently, and by positioning the second electrode portion 312 on the side of the welding ring 33 away from the electrode assembly 50, when assembling the electrode body 31 and the welding ring 33, the first electrode portion 311 can be assembled with the welding ring 33 first, and then the second electrode portion 312 can be connected to the end of the first electrode portion 311 away from the electrode assembly 50. This facilitates the assembly of the electrode body 31 and the welding ring 33, and the second electrode portion 312 can axially limit the installation of the electrode body 31 and the welding ring 33, preventing the electrode body 31 from moving towards the side closer to the electrode assembly 50. Furthermore, since the second electrode portion 312 is located on the side of the welding ring 33 away from the electrode assembly 50, the second electrode portion 312 can enhance the compression effect of the welding ring 33 on the seal 321, further improving the sealing effect of the seal 321.

[0194] Furthermore, by configuring the first electrode post 311 to include a first column segment 3111 and a second column segment 3112, and by having a seal 321 surround the first column segment 3111 and by having at least a portion of the seal 321 sandwiched between the second column segment 3112 and the welding ring 33, the second column segment 3112 and the welding ring 33 together exert a compressive force on the seal 321 in the axial direction of the electrode post body 31, which is beneficial to improving the sealing effect of the seal 321. In addition, since the second electrode post 312 is located on the side of the welding ring 33 away from the electrode assembly 50, both the welding ring 33 and the seal 321 are sandwiched between the second electrode post 312 and the second column segment 3112 of the electrode post body 31. By using the electrode post body 31 itself to compress the seal 321, a stronger compressive force can be provided to the seal 321, which is beneficial to further improving the sealing effect of the seal 321.

[0195] In some embodiments, refer to Figure 8 The welding ring 33 includes a first welding ring 335 and a second welding ring 336. The first welding ring 335 and the second welding ring 336 are both independently molded parts. The first welding ring 335 surrounds the electrode body 31 and overlaps with the first shell wall 20. The second welding ring 336 surrounds the electrode body 31 and is connected to the first welding ring 335. The electrode body 31 includes a body portion 313 and a flange portion 314. The flange portion 314 is connected to the outer peripheral wall of the body portion 313 and is disposed around the body portion 313. At least a portion of the sealing member 321 is clamped between the flange portion 314 and the first welding ring 335. A portion of the second welding ring 336 is located on the side of the flange portion 314 away from the electrode assembly 50 to install and fix the electrode body 31.

[0196] The fact that at least a portion of the seal 321 is clamped between the flange portion 314 and the first welding ring 335 can include the following situations: for example, a portion of the seal 321 may be clamped between the flange portion 314 and the first welding ring 335, while another portion of the seal 321 is located between the first welding ring 335 and the body portion 313; or, for another example, the entire seal 321 may be clamped between the flange portion 314 and the first welding ring 335, and the first welding ring 335 and the body portion 313 may be insulated from each other by the insulating structure 32, excluding the seal 321.

[0197] In the above technical solution, the welding ring 33 is configured to include a first welding ring 335 and a second welding ring 336, which facilitates the assembly and connection of the welding ring 33 with the insulating structure 32 and the electrode body 31, making the electrode component 30 easy to manufacture and allowing for easy control of the compression of the seal 321, thus improving sealing reliability. Furthermore, by configuring the electrode body 31 to include a body portion 313 and a flange portion 314 disposed on the outer periphery of the body portion 313, the flange portion 314 and the first welding ring 335 together clamp the seal 321, which can apply a strong compressive force to the seal 321, thus improving the sealing effect of the seal 321. Additionally, by partially pressing the second welding ring 336 against the side of the flange portion 314 away from the electrode assembly 50, the electrode body 31 can be easily limited, ensuring that the electrode body 31 is reliably installed and fixed to the first shell wall 20.

[0198] In some embodiments, the welding ring 33 is made of aluminum and the first shell wall 20 is made of steel.

[0199] For example, the housing component 10 can be made entirely of steel.

[0200] In the above technical solution, by setting the welding ring 33 as an aluminum part, the processing and forming of the welding ring 33 is convenient, and the processing and forming process of the welding ring 33 is less restricted. For example, the welding ring 33 can be formed by stamping. By setting the first shell wall 20 as a steel part, the first shell wall 20 can have better structural strength and hardness, which is beneficial to reducing the deformation of the first shell wall 20. Since it is difficult to directly stamp the steel first shell wall 20 to form a chamfered structure for assembly guidance with the welding ring 33, if the assembly method of the pole component and the shell in the related technology is adopted, the assembly gap between the first shell wall and the welding ring needs to be increased. This will affect and reduce the welding quality of the first shell wall and the welding ring, resulting in the failure of the weld 40. By making the first shell wall 20 and the welding ring 33 adopt a welded lap connection method, the chamfered structure for assembly guidance can be eliminated from the first shell wall 20, and the assembly gap between the first shell wall 20 and the welding ring 33 can be smaller, which is beneficial to improving the welding quality between the first shell wall 20 and the welding ring 33.

[0201] In some embodiments, at least one of the welding ring 33 and the first shell wall 20 is a stamped part.

[0202] For example, the welding ring 33 is a stamped part, or the first shell wall 20 is a stamped part, or both the welding ring 33 and the first shell wall 20 are stamped parts.

[0203] In the above technical solution, by making at least one of the welding ring 33 and the first shell wall 20 a stamped part, the stamping process is relatively mature, which is conducive to reducing the processing cost of the welding ring 33 and / or the first shell wall 20. Moreover, the workpiece formed by the stamping process has higher structural strength, which also makes the welding ring 33 and / or the first shell wall 20 have higher structural strength. Furthermore, compared with the workpiece formed by milling and other processes, the workpiece formed by the stamping process can reduce the risk of defective products such as milling burrs and steel wires, which is conducive to improving the incoming material yield of the welding ring 33 and / or the first shell wall 20.

[0204] Secondly, referring to Figure 9 The present invention proposes a battery device 200, comprising: a housing 60 and a battery cell 100 according to the first aspect embodiment of the present invention, wherein the battery cell 100 is disposed within the housing 60.

[0205] In the above technical solution, by setting the battery cell 100, the airtightness and assembly quality of the battery cell 100 are high, which is conducive to improving the performance of the battery device 200. Furthermore, the assembly method of the terminal component 30 of the battery cell 100 can be compatible with automatic assembly equipment with different assembly positioning tolerances, which is conducive to reducing production costs.

[0206] Thirdly, referring to Figure 10 The present invention provides an electrical device 1000, which includes a battery device 200 according to the second aspect embodiment of the present invention described above.

[0207] The electrical device 1000 can be a vehicle, and the battery device 200 can be installed at the bottom of the vehicle body 300.

[0208] In the above technical solution, by setting the battery device 200, the airtightness and assembly quality of the battery cell 100 in the battery device 200 are high, which is conducive to improving the performance of the battery device 200. Furthermore, the assembly method of the terminal component 30 of the battery cell 100 can be compatible with automatic assembly equipment with different assembly positioning tolerances, which is conducive to reducing production costs.

[0209] The following reference Figures 1-5 A battery cell 100 is described according to some embodiments of the present invention.

[0210] Reference Figures 1-5In this embodiment, the battery cell 100 includes a housing component 10, an electrode assembly 50, and a terminal component 30. The housing component 10 includes a first housing wall 20, on which a mounting hole 21 is provided. The electrode assembly 50 is accommodated within the housing component 10. The terminal component 30 is mounted at the mounting hole 21 and includes a terminal body 31, a welding ring 33, and an insulating structure 32. The terminal body 31 is connected to the electrode assembly 50. The welding ring 33 surrounds the terminal body 31 and overlaps with the first housing wall 20. The insulating structure 32 is insulatingly fitted between the welding ring 33 and the terminal body 31.

[0211] The welding ring 33 includes a welding ring body 331 and a first overlapping portion 334. The welding ring body 331 surrounds the electrode post body 31, and the first overlapping portion 334 is connected to the outer periphery of the welding ring body 331. The first shell wall 20 includes a connected first shell wall body 23 and a second overlapping portion 24. The first overlapping portion 334 and the second overlapping portion 24 overlap and are connected in the thickness direction of the first shell wall 20. The first overlapping portion 334 is disposed around the welding ring body 331, and the second overlapping portion 24 is disposed around the mounting hole 21. The first overlapping portion 334 is located on the side of the second overlapping portion 24 facing away from the electrode assembly 50. A mounting groove 22 is formed on the side of the first shell wall 20 facing away from the electrode assembly 50. The first overlapping portion 334 is accommodated in the mounting groove 22, and the bottom wall of the mounting groove 22 constitutes the second overlapping portion 24. The first lap joint 334 is welded to the second lap joint 24, and the first lap joint 334 and the second lap joint 24 are connected by a weld 40, which is circumferential.

[0212] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0213] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, The application relates to a shell component, an electrode assembly and a pole component. The shell component comprises a first shell wall provided with a mounting hole. The electrode assembly is accommodated in the shell component. The pole component is mounted at the mounting hole and comprises a pole body connected with the electrode assembly, a welding ring surrounding the pole body and overlapping the first shell wall, and an insulation structure fitted between the welding ring and the pole body. The welding ring comprises a welding ring body surrounding the pole body and a first overlapping part connected at the outer circumferential side of the welding ring body.

2. The battery cell of claim 1, wherein, The first shell wall comprises a first shell wall body and a second overlapping part connected with the first overlapping part.

3. The battery cell of claim 1, wherein, The first overlapping part is arranged around the welding ring body, and the second overlapping part is arranged around the mounting hole.

4. The battery cell of claim 3, wherein, The first shell wall is provided with an assembly groove on the side away from the electrode assembly, and at least part of the first overlapping part is accommodated in the assembly groove.

5. The battery cell of claim 3, wherein, The bottom wall of the assembly groove constitutes the second overlapping part.

6. The battery cell of claim 1, wherein, The side surface of the first shell wall body away from the electrode assembly is a first surface.

7. The battery cell of claim 6, wherein, The thickness of the first overlapping part is less than the thickness of the second overlapping part.

8. The battery cell of claim 1, wherein, The ratio of the thickness of the first overlapping part to the thickness of the second overlapping part is 0.3-0.

7.

9. The battery cell of claim 1, wherein, The thickness of the first overlapping part is consistent with the thickness of the welding ring body.

10. The battery cell of claim 9, wherein, The thickness of the first overlapping part is less than the thickness of the welding ring body.

11. The battery cell of claim 9, wherein, The ratio of the thickness of the first overlapping part to the thickness of the welding ring body is 0.3-0.

7.

12. The battery cell of claim 11, wherein, The part of the welding ring body protruding from the first overlapping part in the direction close to the electrode assembly is a fitting part accommodated in the mounting hole.

13. The battery cell of claim 11, wherein, At least part of the outer circumferential wall of the fitting part constitutes a positioning surface.

14. The battery cell of claim 1, wherein, The ratio of the thickness of the second overlapping part to the thickness of the first shell wall body is 0.7-1.

2.

15. The battery cell of claim 1, wherein, A radial width of the second lap portion in a radial direction of the mounting hole is 1.9-2.9 mm.

16. The battery cell of claim 1, wherein, In a radial direction of the mounting hole, a radial width of the second lap portion is W1, a lap width of the first lap portion and the second lap portion is W2, and a ratio of W2 to W1 is 0.85-0.

95.

17. The battery cell of claim 1, wherein, In a radial direction of the mounting hole, a center line at a middle position of the weld is a weld center line, and a distance between the weld center line and an inner peripheral wall of the second lap portion is d3, and d3≥0.5 mm.

18. The battery cell of claim 1, wherein, In a radial direction of the mounting hole, a center line at a middle position of the weld is a weld center line, and a distance between the weld center line and an outer peripheral wall of the first lap portion is d4, and d4≥0.5 mm.

19. The battery cell of claim 1, wherein, The weld is annular and extends in a circumferential direction of the weld ring.

20. The battery cell of any one of claims 1-19, wherein, The insulating structure includes a seal that is clamped between the pole body and the weld ring.

21. The battery cell of claim 20, wherein, The pole body includes a first pole portion and a second pole portion, the second pole portion and the first pole portion are both separately formed pieces, the second pole portion is connected to the first pole portion and is located on a side of the weld ring that faces away from the electrode assembly, the first pole portion includes a first pole segment and a second pole segment that are arranged in an axial direction of the first pole portion, the weld ring is wrapped around an outer peripheral side of the first pole segment, the second pole segment is located on a side of the weld ring that is close to the electrode assembly and is connected to the electrode assembly, and at least a portion of the seal is clamped between the second pole segment and the weld ring.

22. The battery cell of claim 20, wherein, The weld ring includes a first weld ring and a second weld ring, the first weld ring and the second weld ring are both separately formed pieces, the first weld ring is wrapped around the pole body and is lapped with the first shell wall, the second weld ring is wrapped around the pole body and is connected to the first weld ring, the pole body includes a body portion and a flange portion, the flange portion is connected to an outer peripheral wall of the body portion and is arranged around the body portion, at least a portion of the seal is clamped between the flange portion and the first weld ring, and a portion of the second weld ring is located on a side of the flange portion that faces away from the electrode assembly to mount and fix the pole body.

23. The battery cell of any one of claims 1-19, wherein, The weld ring is an aluminum piece, and the first shell wall is a steel piece.

24. The battery cell of any one of claims 1-19, wherein, At least one of the weld ring and the first shell wall is a stamped piece.

25. A battery device, characterized by Comprising: a box; a battery cell according to any one of claims 1-24, the battery cell being disposed within the box.

26. An electrical device, comprising: Comprising: a battery device according to claim 25.

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